As filed with the Securities and Exchange Commission on October 1, 2003
                           Registration No. 333-88314

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                       -----------------------------------

                         POST-EFFECTIVE AMENDMENT NO. 2
                                       TO
                                    FORM SB-2
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                       -----------------------------------

                        NATURAL GAS SERVICES GROUP, INC.
                 (Name of small business issuer in its charter)

            Colorado                       3533                    75-2811855
------------------------------ ----------------------------  -------------------
(State or jurisdiction of      (Primary Standard Industrial  (I.R.S. Employer
incorporation or organization) Classification Code Number)   Identification No.)


                           2911 South County Road 1260
                              Midland, Texas 79706
                                 (915) 563-3974
                         -------------------------------
          (Address and telephone number of principal executive offices
                        and principal place of business)

                                 Wayne L. Vinson
                           2911 South County Road 1260
                              Midland, Texas 79706
                                 (915) 563-3974
                         -------------------------------
           (Name, address and telephone number of agent for service)

                                   COPIES TO:
                              Thomas S. Smith, Esq.
                              Jones & Keller, P.C.
                            1625 Broadway, Suite 1600
                             Denver, Colorado 80202
                            Telephone: (303) 573-1600
                         -------------------------------

  Approximate date of proposed sale to the public: As soon as practicable after
            the effective date of this Post-Effective Amendment No. 2
                         to the Registration Statement.

         If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the  Securities  Act,  check the following box and
list the Securities Act registration  statement number of the earlier  effective
registration statement for the same offering. [_]
         If this  Form is a  post-effective  amendment  filed  pursuant  to Rule
462(c) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. [_]
         If this  Form is a  post-effective  amendment  filed  pursuant  to Rule
462(d) under the Securities Act, check the following box and list the Securities
Act  registration   statement  number  of  the  earlier  effective  registration
statement for the same offering. [_]
         If delivery of the  prospectus  is expected to be made pursuant to Rule
434, check the following box. [_]





            PROSPECTUS SUBJECT TO COMPLETION, DATED OCTOBER 1, 2003


                        NATURAL GAS SERVICES GROUP, INC.


         We are  offering  1,500,000  shares  of our  common  stock  to  holders
electing to exercise  warrants  issued as part of our initial public offering in
October  2002.  The  1,500,000  warrants  sold to the public in our offering are
exercisable at $6.25 per share.  If all of the warrants are  exercised,  we will
receive gross proceeds of $9,375,000.

         We  also  issued  options  to the  underwriter  of our  initial  public
offering to purchase  150,000 shares of our common stock for $6.25 per share and
to purchase  warrants to purchase  150,000 shares of our common stock at $0.3125
per warrant. The underwriter subsequently transferred the options to the selling
securityholders.  Each warrant entitles the holders to purchase one share of our
common stock for $7.8125 per share.  If the options and warrants are  exercised,
we will receive gross proceeds of $2,156,250.

         Our  common  stock and  public  warrants  trade on the  American  Stock
Exchange under the symbols NGS and NGS.WS.

                           -------------------------

         You should  carefully  consider  the risk  factors  beginning on page 6
before purchasing any of the securities.

         Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus  is truthful or  complete.  Any  representation  to the contrary is a
criminal offense.

                            -------------------------






              The date of this prospectus is _______________, 2003






                     ABOUT NATURAL GAS SERVICES GROUP, INC.

         We provide  equipment and services to the natural gas and oil industry.
We manufacture,  fabricate,  sell and lease natural gas compressors that enhance
the  production  of oil and gas wells and we provide  maintenance  services  for
those  compressors.  We define a natural gas  compressor as a mechanical  device
with one basic goal - to deliver gas at a pressure  higher than that  originally
existing. It may be powered by a natural gas burning engine or an electric motor
to  accommodate  different  applications.   Gas  compression  is  undertaken  to
transport and distribute  natural gas to pipelines.  Pipeline pressures vary and
with the  addition  of new  wells  to the  pipeline,  the  need for  compression
increases.  We also manufacture and sell flare tips and ignition systems for oil
and gas plant and  production  facilities.  We define a flare tip as a burner on
the upper end of a flare stack that is designed to combust waste gases to assure
a clean  environment.  An ignition  system is a pilot light or a spark generator
that assures continuous  ignition of the waste gases going through the burner in
the flare tip.

         We primarily lease natural gas compressors. As of June 30, 2003, we had
312 natural gas compressors under lease to third parties.

         We also fabricate natural gas compressors for our customers,  designing
compressors to meet unique specifications dictated by well pressures, production
characteristics and particular applications for which compression is sought.

         We have  established an exchange and rebuild program to attempt to help
minimize  costs and maximize  revenue for our customers.  Under the program,  we
work  with  maintenance  and  operating  personnel  of a  customer  to  identify
equipment for exchange.  When we receive a compressor for exchange  because of a
maintenance problem, we deliver to our customer a replacement compressor at full
price. We then rebuild the exchange compressor and credit our customer an amount
based on the  value of the  rebuilt  compressor.  We also  offer a  retrofitting
service by repackaging a customer's  compressor with a compressor that meets our
customer's changed conditions.

         We design,  manufacture,  install and service  flare stacks and related
ignition and control  devices for onshore and offshore  burning of gas compounds
such as hydrogen sulfide,  carbon dioxide,  natural gas and liquefied  petroleum
gases.

         We have  manufacturing and fabrication  facilities located in Lewiston,
Michigan,  and Midland,  Texas,  where we manufacture and fabricate  natural gas
compressors. We design and manufacture natural gas flare systems, components and
ignition  systems  in our  facility  in  Midland,  Texas,  for use in  oilfield,
refinery and petrochemical plant applications.

         We currently  provide our  products and services to a customer  base of
oil  and  gas  exploration  and  production  companies  operating  primarily  in
Colorado, Kansas, Louisiana, Michigan, New Mexico, Oklahoma, Texas and Wyoming.

         We  maintain  our  principal  office at 2911  South  County  Road 1260,
Midland, Texas 79706 and our telephone number is (915) 563-3974.



2


                             SUMMARY OF THE OFFERING


Securities offered by us....................... 1,500,000 shares of common stock
                                                issuable    upon   exercise   of
                                                warrants  that  are  held by the
                                                public  and are  exercisable  at
                                                $6.25  per  share  at  any  time
                                                prior to 5:00 p.m. (MST) October
                                                20, 2006.

Securities offered by
selling securityholders(1)..................... 300,000  shares of common  stock
                                                underlying options and warrants.

Common stock outstanding ...................... 5,022,181 shares.

Common stock to be outstanding if
all warrants and options are exercised......... 6,822,181 shares.(2)

Public Warrant Terms:
  Exercise price............................... $6.25 per share.
  Expiration date.............................. 5:00 p.m. (MST) October 20, 2006
  Redemption .................................. We may redeem the warrants  upon
                                                30 days' prior written notice at
                                                a price of $.25 per  warrant  if
                                                the closing  price of our common
                                                stock equals or exceeds $10.9375
                                                for 20 consecutive trading days.

Use of proceeds................................ We plan to use the net  proceeds
                                                from the exercise of the options
                                                and   warrants,   if  any,   for
                                                general  corporate  purposes and
                                                working capital.

American Stock Exchange symbols
  Common stock................................. NGS
  Warrants..................................... NGS.WS

Risk factors................................... Our  securities  involve  a high
                                                degree  of  risk  and  immediate
                                                dilution. Warrant holders should
                                                carefully  consider  all  of the
                                                factors set forth herein  before
                                                exercising   their  warrants  to
                                                purchase common stock.

-----------------
(1) There is no  trading  market  for the  selling  securityholders'  options or
warrants and none is expected to develop.  The options to purchase our shares of
common  stock and warrants  cannot be  exercised by the selling  securityholders
until October 21, 2003.

(2) Assumes all warrants and the selling securityholders' options are exercised.



3





Summary Consolidated Financial Data

         The following table  summarizes our financial data. You should refer to
the consolidated  financial statements included elsewhere in this prospectus for
a  more  complete   description  of  our  financial  condition  and  results  of
operations.



Consolidated Statement of                                                        For the Six Months
Income and Other Data (1):               For the Year Ended December 31.            Ended June 30.
                                         -------------------------------    -------------------------------
                                              2001              2002             2002              2003
                                         -------------     -------------    -------------     -------------
                                      (in thousands except per share data)
                                                                                  
Revenue                                  $       8,762     $      10,297    $       5,120     $       5,565
Total costs of revenue                           4,942             5,572            2,806             2,586
                                         -------------     -------------    -------------     -------------

Gross profit                                     3,820             4,725            2,314             2,979

Income from operations                           1,199             1,841              932             1,084
Total other expense                               (503)             (471)            (313)             (329)
                                         -------------     -------------    -------------     -------------
Income  before  provision  for  income
     taxes                                         696             1,370              619               755
Total income tax expense                           314               584              280               322
                                         -------------     -------------    -------------     -------------
Net income                                         382               786              339               433
Preferred dividends                                 11               107               76                62
                                         -------------     -------------    -------------     -------------
Net income available to common
     shareholders                        $         371     $         679    $         263     $         371
                                         =============     =============    =============     =============

Per Common Share Data:
     Basic                               $         .11     $         .19    $         .08     $         .08
                                         =============     =============    =============     =============
     Diluted                             $         .11     $         .16    $         .06     $         .07
                                         =============     =============    =============     =============
Weighted Average Shares
of Common Stock Outstanding
     Basic                                   3,357,632         3,649,413        3,357,632         4,866,527
     Diluted                                 3,483,987         4,305,053        4,163,710         5,116,332







Consolidated Balance Sheet Data (1):
                                 December 31, 2002     June 30, 2003
                                 -----------------   -----------------
                                            (in thousands)

Current assets ..............    $           5,084   $           4,832
Total assets ................               23,937              26,990
Current liabilities..........                2,669               3,840
Shareholders' equity.........               13,001              13,572




4




Consolidated Statement of Cash
Flows:
                                                                           For the Six Months
                                   For the Year Ended December 31.             Ended June 30.
                                   -------------------------------    ------------------------------
                                       2001              2002             2002              2003
                                   -------------     -------------    -------------     -------------
                                                             (in thousands)
                                                                            

Cash flows provided by (used in)
operating activities ...........   $         840             2,206    $       1,278     $         536
Cash flow used in investment
activities .....................          (3,087)           (3,885)          (2,132)           (3,850)
Cash flow provided by financing
activities .....................           2,611             3,886              689             1,576



---------------------
(1)The   financial   information   reflects  the   acquisition   by  us  of  the
compression-related  assets of Dominion Michigan on March 29, 2001. The purchase
price  was  $8,000,000,  of which  $1,000,000  was paid at  closing  and the net
balance was financed by Dominion Michigan. The operations and assets of Dominion
Michigan that we acquired are included in our consolidated  financial statements
commencing on April 1, 2001.































5



                                  RISK FACTORS

         To inform investors of our future plans and objectives, this prospectus
(and other  reports and  statements  issued by us and our officers  from time to
time) contain certain statements concerning our future performance,  intentions,
objectives,   plans  and   expectations   that  are  or  may  be  deemed  to  be
"forward-looking  statements."  Our ability to do this has been  fostered by the
Private Securities Litigation Reform Act of 1995, which provides a "safe harbor"
for  forward-looking  statements to encourage  companies to provide  prospective
information so long as those statements are accompanied by meaningful cautionary
statements  identifying  important  factors that could cause  actual  results to
differ materially from those discussed in the statement.

         You  should  carefully  consider  the  following  risks.  The risks and
uncertainties  described below are not the only ones facing us. Additional risks
and  uncertainties  that are not presently known to us or that we currently deem
immaterial may also impair our business.

         If any of the events  described in the following  risks actually occur,
our business,  financial condition and results of operations could be materially
adversely  affected.  In such case,  the trading  prices of our common  stock or
warrants could decline and you could lose all or part of your investment.

Our  current  debt is large and may  negatively  impact our  current  and future
financial stability.

         As of June 30, 2003, we had an aggregate of  approximately  $10,365,000
of  outstanding  indebtedness,  not  including  accounts  payable,  and  accrued
expenses of approximately $973,000. As a result of our significant indebtedness,
we might not have the ability to incur any substantial additional  indebtedness.
The level of our indebtedness could have several important effects on our future
operations, including:

         o        our  ability  to  obtain  additional   financing  for  working
                  capital, acquisitions, capital expenditures and other purposes
                  may be limited;

         o        a significant  portion of our cash flow from operations may be
                  dedicated  to the  payment of  principal  and  interest on our
                  debt, thereby reducing funds available for other purposes; and

         o        our  significant  leverage  could make us more  vulnerable  to
                  economic downturns.

If we are unable to service our debt,  we will likely be forced to take remedial
steps that are contrary to our business plan.

         As of June  30,  2003,  our debt  service  requirements  on a  monthly,
quarterly and annual basis were $186,803, $560,404 and $2,241,636, respectively.
It is possible  that our business  will not generate  sufficient  cash flow from
operations  to meet our debt service  requirements  and the payment of principal
when due. If this were to occur, we may be forced to:


6


         o        sell assets at disadvantageous prices;

         o        obtain additional financing; or

         o        refinance all or a portion of our  indebtedness  on terms that
                  may be very unfavorable to us.

Our current bank loan contains  covenants that limit our operating and financial
flexibility and, if breached, could expose us to severe remedial provisions.

         Under the terms of the bank loan, we must:

         o        comply with a debt to asset ratio;

         o        maintain minimum levels of tangible net worth;

         o        not exceed specified levels of debt;

         o        comply with a cash flow to fixed charges ratio;

         o        comply with a debt to net worth ratio; and

         o        not incur additional debt over a specified amount.

         Our ability to meet the financial  ratios and tests under our bank loan
can be affected by events beyond our control,  and we may not be able to satisfy
those  ratios  and  tests.  A  breach  under  either  could  permit  the bank to
accelerate  the  debt so that it is  immediately  due and  payable.  No  further
borrowings  would be available under the credit  facility.  If we were unable to
repay the debt, the bank could proceed against our assets.

Approximately 80% of our compressor leases are leased for terms of six months or
less and, if terminated,  would adversely  impact our revenue and our ability to
recover our initial equipment costs.

         Approximately  80% of our compressor  leases are for terms of up to six
months.  There is a possibility that these leases could be terminated by lessees
within short  periods of time and that we may not be able to recover the cost of
a compressor for which a lease is terminated.

















7



The  anticipated  revenue  from the  affiliate  of Dominion  Michigan  cannot be
guaranteed.

         In connection with our acquisition of the compression-related assets of
Dominion  Michigan,  an  affiliate  of Dominion  Michigan  committed to purchase
compressors  from us or enter  into five  year  leases  of  compressors  with us
totaling  five-thousand  horsepower.  If, for any reason, the affiliate does not
fulfill  this  obligation  to  any  material  extent,  our  cash  flow  will  be
significantly reduced and we may not be able to pay the principal or interest on
our debt as it becomes due.

We rely on one customer for a significant amount of our business and the loss of
this customer could adversely  affect our operating  results and lower the price
of our common stock.

         During  the six months  ended June 30,  2003,  Dominion  Exploration  &
Production,  Inc.  accounted for approximately 31% of our consolidated  revenue.
During the years ended December 2002 and 2001,  Dominion  Exploration  accounted
for approximately  30% and 26% of our consolidated  revenue,  respectively.  The
loss of Dominion  Exploration as a customer could cause our operating results to
fall  below  market  analysts'  expectations  and lower the price of our  common
stock.

We are dependent on a few suppliers for some of our  compressor  components  and
the loss of one of these suppliers could cause a delay in the  manufacturing  of
our compressors and reduce our revenue.

         We currently obtain approximately 32% of our compressor components from
two suppliers.  We order from these suppliers as needed and we have no long-term
contracts with either supplier.  If either of these suppliers should curtail its
operations  or be  unable  to meet our  needs,  we  would  encounter  delays  in
supplying our customers with compressors until an alternative  supplier, if any,
could be found.  Such  delays in our  manufacturing  process  could  reduce  our
revenue and negatively impact our relationships with customers.

Decreased oil and gas industry  expenditure  levels would  adversely  affect our
revenue.

         Our revenue is derived  from  expenditures  in the oil and gas industry
which, in turn, are based on budgets to explore for, develop and produce oil and
natural  gas. If these  expenditures  decline,  our  revenue  will  suffer.  The
industry's willingness to explore,  develop and produce depends largely upon the
prevailing view of future oil and gas prices. Many factors affect the supply and
demand for oil and gas and, therefore, influence product prices including:

         o        the level of oil and gas production;

         o        the levels of oil and gas inventories;

         o        the expected cost of developing new reserves;

         o        the cost of producing oil and gas;



8



         o        the level of drilling activity;

         o        inclement weather;

         o        worldwide economic activity;

         o        regulatory  and other  federal and state  requirements  in the
                  United States;

         o        the  ability  of  the  Organization  of  Petroleum   Exporting
                  Countries to set and maintain production levels and prices for
                  oil;

         o        terrorist activities in the United States and elsewhere;

         o        the cost of developing alternate energy sources;

         o        environmental regulation; and

         o        tax policies.

         If  the  demand  for  oil  and  gas  decreases,  then  demand  for  our
compressors likely will decrease.

The intense  competition in our industry  could result in reduced  profitability
and loss of market share for us.

         We sell or lease our  products  and sell our  services  in  competitive
markets.  In most of our  business  segments,  we  compete  with the oil and gas
industry's  largest  equipment  and  service  providers  who have  greater  name
recognition  than  we  do.  These  companies  also  have  substantially  greater
financial  resources,  larger  operations  and greater  budgets  for  marketing,
research  and  development  than we do.  They may be better  able to  compete in
making  equipment  available  quickly  and more  efficiently,  meeting  delivery
schedules or reducing  prices.  As a result,  we could lose customers and market
share to those  competitors.  These companies may also be better positioned than
us successfully to endure downturns in the oil and gas industry.

         Our operations may be adversely affected if our current  competitors or
new market  entrants  introduce  new  products or services  with better  prices,
features, performance or other competitive characteristics than our products and
services.  Competitive pressures or other factors also may result in significant
price competition that could harm our revenue and our business.

We might be unable to employ adequate technical personnel which could hamper our
plans for expansion or increase our costs.

         Many of the compressors  that we sell or lease are technically  complex
and often must perform in harsh conditions.  We believe that our success depends
upon our ability to employ and retain a sufficient number of technical personnel
who have the ability to design, utilize, enhance and maintain these compressors.
Our ability to expand our operations  depends in part on our ability to increase



9



our skilled  labor force.  The demand for skilled  workers is high and supply is
limited. A significant  increase in the wages paid by competing  employers could
result in a reduction of our skilled  labor  force,  or cause an increase in the
wage rates that we must pay, or both.  If either of these  events were to occur,
our cost structure could increase and our operations and growth  potential could
be impaired.

If we do not develop, produce and commercialize new competitive technologies and
products, our revenue may decline.

         The markets for natural gas  compressor  products  and services and for
flare  systems,  ignition  systems  and  components  for  plant  and  production
facilities  are  characterized  by continual  technological  developments.  As a
result,  substantial  improvements in the scope and quality of product  function
and  performance  can occur over a short  period of time.  If we are not able to
develop  commercially  competitive  products  in a timely  manner in response to
changes in technology, our business and revenue may be adversely affected.

         We  may  encounter   financial   constraints   or  technical  or  other
difficulties  that could delay  introduction of new products and services in the
future.  Our  competitors  may introduce new products before we do and achieve a
competitive advantage.

         Additionally,  the time and expense invested in product development may
not result in commercial applications that provide revenue. We could be required
to write  off our  entire  investment  in a new  product  that  does  not  reach
commercial  viability.  Moreover,  we may experience  operating losses after new
products are  introduced  and  commercialized  because of high  start-up  costs,
unexpected manufacturing costs or problems, or lack of demand.

We are  subject  to  extensive  environmental  laws and  regulations  that could
require us to take  costly  compliance  actions  that  could harm our  financial
condition.

         Our manufacturing and maintenance operations are significantly affected
by stringent and complex federal, state and local laws and regulations governing
the  discharge of  substances  into the  environment  or  otherwise  relating to
environmental  protection. In these operations, we generate and manage hazardous
wastes such as solvents,  thinner,  waste paint, waste oil, washdown wastes, and
sandblast material.  We attempt to use generally accepted operating and disposal
practices and, with respect to acquisitions, will attempt to identify and assess
whether there is any environmental risk before completing an acquisition.  Based
on the nature of the industry,  however,  hydrocarbons  or other wastes may have
been disposed of or released on or under properties  owned,  leased, or operated
by us or on or under  other  locations  where  such  wastes  have been taken for
disposal.  The  wastes on these  properties  may be  subject to federal or state
environmental laws that could require us to remove the wastes or remediate sites
where they have been  released.  We could be exposed to  liability  for  cleanup
costs,  natural  resource  and other  damages as a result of our  conduct or the
conduct of, or  conditions  caused by, prior  operators or other third  parties.
Environmental laws and regulations have changed in the past, and they are likely
to change in the future.  If existing  regulatory  requirements  or  enforcement
policies change,  we may be required to make significant  unanticipated  capital
and operating expenditures.



10



         Any  failure by us to comply  with  applicable  environmental  laws and
regulations  may result in governmental  authorities  taking actions against our
business that could harm our operations and financial condition, including the:

         o        issuance of administrative, civil and criminal penalties;

         o        denial or revocation of permits or other authorizations;

         o        reduction or cessation in operations; and

         o        performance   of  site   investigatory,   remedial   or  other
                  corrective actions.

We  could be  subject  to  substantial  liability  claims  that  could  harm our
financial condition.

         Our products are used in hazardous drilling and production applications
where an accident or a failure of a product can cause personal  injury,  loss of
life,  damage to  property,  equipment  or the  environment,  or  suspension  of
operations.

         While we maintain insurance coverage, we face the following risks under
our insurance coverage:

         o        we may  not  be  able  to  continue  to  obtain  insurance  on
                  commercially reasonable terms;

         o        we may be faced  with  types of  liabilities  that will not be
                  covered by our  insurance,  such as damages  from  significant
                  product liabilities and from environmental contamination;

         o        the  dollar  amount of any  liabilities  may exceed our policy
                  limits; and

         o        we do not maintain  coverage  against the risk of interruption
                  of our business.

         Any claims  made under our policy  will  likely  cause our  premiums to
increase.  Any future  damages  caused by our products or services  that are not
covered  by  insurance,  are in  excess  of  policy  limits  or are  subject  to
substantial  deductibles,  would reduce our earnings and our cash  available for
operations.

Liability to customers under  warranties may materially and adversely affect our
earnings.

         We provide  warranties as to the proper  operation and  conformance  to
specifications  of the  equipment we  manufacture.  Our equipment is complex and
often  deployed  in harsh  environments.  Failure of this  equipment  to operate
properly  or  to  meet  specifications  may  increase  our  costs  by  requiring
additional  engineering  resources  and  services,   replacement  of  parts  and
equipment or monetary  reimbursement to a customer. We have in the past received
warranty claims and we expect to continue to receive them in the future.  To the
extent that we incur substantial  warranty claims in any period, our reputation,
our ability to obtain future  business and our earnings  could be materially and
adversely affected.




11


Loss of key members of our management  could adversely affect our business while
we attempt to find their replacements.

         We depend  on the  continued  employment  and  performance  of Wayne L.
Vinson,  our  President  and the  President  of  Rotary  Gas  Systems,  Scott W.
Sparkman, our Secretary and the Executive Vice President of NGE Leasing, Earl R.
Wait, our Treasurer and Chief  Financial  Officer,  and other key members of our
management.  If any of our key managers resigns or becomes unable to continue in
his present role and is not adequately  replaced,  our business operations could
be  materially  adversely  affected.  We do not  maintain  any  "key  man"  life
insurance for any of our officers,  except for policies  totaling  $1,500,000 on
the life of Wayne L. Vinson. We are the beneficiary of these policies.

We are  reliant on our current  customers  for future cash flows and the loss of
one or more of our  current  customers  could  adversely  affect our  results of
operations.

         Our business is dependent  not only on securing new  customers but also
on maintaining current customers.  Dominion  Exploration & Production,  Inc., an
affiliate  of  Dominion  Resources,   Inc.,  accounted  for  approximately  31%,
approximately 30% and  approximately 26% of our consolidated  revenue during the
six months  ended June 30,  2003 and for the years ended  December  31, 2002 and
December  31,  2001,  respectively.  The loss of one or more of our  significant
customers would have an adverse effect on our revenue and results of operations.

Provisions  contained in our  governing  documents  could hinder a change in our
control.

         Our articles of  incorporation  and bylaws contain  provisions that may
discourage acquisition bids and may limit the price investors are willing to pay
for our common  stock and  warrants.  Our articles of  incorporation  and bylaws
provide that:

         o        directors   will  be  elected  for  three-year   terms,   with
                  approximately one-third of the board of directors standing for
                  election each year;

         o        cumulative voting is not allowed,  which limits the ability of
                  minority shareholders to elect any directors;

         o        the   unanimous   vote  of  the  board  of  directors  or  the
                  affirmative  vote of the  holders  of not less than 80% of the
                  votes  entitled  to be  cast  by the  holders  of  all  shares
                  entitled to vote in the  election of  directors is required to
                  change the size of the board of directors; and

         o        directors may only be removed for cause by holders of not less
                  than 80% of the votes entitled to be cast on the matter.



12



         Our board of  directors  has the  authority to issue up to five million
shares  of  preferred  stock.  The board of  directors  can fix the terms of the
preferred stock without any action on the part of our shareholders. The issuance
of  shares  of  preferred  stock  may  delay  or  prevent  a change  in  control
transaction.  In addition,  preferred stock could be used in connection with the
board of  director's  adoption of a  shareholders'  rights plan (also known as a
poison  pill),  which  would make it much more  difficult  to effect a change in
control of us through acquiring or controlling  blocks of our stock. Also, after
completion of this offering, our directors and officers as a group will continue
to  beneficially  own stock.  Although  this is not a majority of our stock,  it
confers  substantial voting power in the election of directors and management of
us. This would make it difficult  for other  minority  shareholders  to effect a
change  in  control  or  otherwise  extend  any  significant  control  over  our
management.  This may adversely  affect the market price and interfere  with the
voting and other rights of our common stock.

If our common stock does not trade for a certain price per share,  our preferred
stock will not automatically convert into our common stock.

         Our currently  outstanding  343,654 shares of 10% Convertible  Series A
Preferred  Stock will  automatically  convert into shares of our common stock if
our common stock trades at or above $6.50 per share for 20  consecutive  trading
days. Until such event occurs, we will be required to:

         o        continue to pay the preferred stock dividend;

         o        permit the preferred stock holders to vote as a separate class
                  where required by Colorado law; and

         o        pay the  holders  of  preferred  stock a  preference  upon our
                  liquidation.

         The same consequences would likely result from any additional preferred
stock that our board of directors may  authorize for issuance in the future,  as
well as additional rights and preferences that could be included in the terms of
the preferred stock.

We have a comparatively  low number of shares of common stock  outstanding  and,
therefore,  our common  stock may suffer from limited  liquidity  and its prices
will likely be volatile and its value may be adversely affected.

         Because the number of freely transferable shares of our common stock is
low, the trading price of our common stock will likely be subject to significant
price fluctuations and limited liquidity. This may adversely affect the value of
your  investment.  In  addition,  our  common  stock  price  could be subject to
fluctuations in response to variations in quarterly  operating results,  changes
in  management,  future  announcements  concerning  us,  general  trends  in the
industry and other events or factors as well as those described above.




13



We must evaluate our intangible assets annually for impairment.

         Our   intangible   assets  are   recorded  at  cost  less   accumulated
amortization  and consist of goodwill  and patent  costs.  Through  December 31,
2001,  goodwill was amortized using the  straight-line  method over 15 years and
patent costs were amortized over 13 to 15 years.

         In June 2001, the Financial Accounting Standards Board issued Statement
of  Financial  Accounting  Standards  No. 142,  "Goodwill  and Other  Intangible
Assets."  FAS  142  provides  that:  1)  goodwill  and  intangible  assets  with
indefinite lives will no longer be amortized;  2) goodwill and intangible assets
with indefinite  lives must be tested for impairment at least  annually;  and 3)
the amortization  period for intangible  assets with finite lives will no longer
be limited to forty years. In the event that we determine our intangible  assets
with indefinite  lives have been impaired,  we must record a write-down of those
assets on our  statement  of  operations  during the period of  impairment.  Our
determination of impairment will be based on various  factors,  including any of
the following factors, if they materialize:

         o        significant under performance  relative to expected historical
                  or projected future operating results;

         o        significant  changes in the manner of our use of the  acquired
                  assets or the strategy for our overall business;

         o        significant negative industry or economic trends;

         o        significant decline in our stock price for a sustained period;
                  and

         o        our market capitalization relative to net book value.

         We  adopted  FAS  142 as of  January  1,  2002.  Based  on  independent
valuations in June 2003 and 2002 of our reporting units with goodwill,  adoption
of FAS 142 has not had a material adverse effect on us through at least 2003. In
the future it could result in impairments of our intangible  assets or goodwill.
We expect to continue to amortize our  intangible  assets with finite lives over
the same time periods as previously used, and we will test our intangible assets
with  indefinite  lives for impairment at least once each year. In addition,  we
are required to assess the  consumptive  life, or longevity,  of our  intangible
assets with finite lives and adjust their amortization periods accordingly.  Our
net  intangible  assets  were  recorded on our  balance  sheet at  approximately
$2,730,000  as of December  31, 2002,  and we expect the  carrying  value of net
intangible  assets  will  increase   significantly  if  we  acquire   additional
businesses. Any impairments in future periods of those assets, or a reduction in
their consumptive  lives, could materially and adversely affect our statement of
operations and financial position.








14



                                 USE OF PROCEEDS

         If all warrants  and options were  exercised,  we would  receive  about
$11,464,375 million net of legal, accounting, printing and other offering costs.

         We  intend  to use any  proceeds  received  from  the  exercise  of our
warrants and options for general corporate purposes and working capital.

         Pending  the uses  described  above,  we will  invest the  proceeds  in
short-term, government, government guaranteed or investment grade securities.
































15



                                 DIVIDEND POLICY

         We have not paid any cash  dividends  on our  common  stock.  It is our
current  policy not to pay cash  dividends on our common  stock.  Any payment of
cash dividends in the future will be dependent upon:

         o        our financial  condition,  results of operations,  current and
                  anticipated cash requirements;
         o        restrictions  on the payment of  dividends  under the terms of
                  our debt obligations and any future financing arrangements;
         o        our plans for expansion;

as well as other factors that our Board of Directors deems relevant.

         We have 343,654 shares of our 10% Convertible  Series A Preferred Stock
outstanding. Holders of that stock are entitled to cash dividends paid quarterly
at a rate  equal  to 10%  per  annum  or  $0.325  per  share  annually.  The 10%
Convertible Series A Preferred stock will automatically  convert into our common
stock at any time if our common stock trades for 20 consecutive  trading days at
a price of $6.50 or more per share.































16



                      SELECTED CONSOLIDATED FINANCIAL DATA

         The following  consolidated  selected  financial data should be read in
conjunction  with  our  Consolidated  Financial  Statements  and  Notes  thereto
appearing elsewhere in this prospectus and "Management's Discussion and Analysis
of Financial  Condition and Results of Operations." The consolidated  statements
of income  data for the years ended  December  31, 2002 and 2001 and the balance
sheet data as of December 31, 2002 are derived from our  consolidated  financial
statements  which have been  audited by Hein + Associates  LLP, our  independent
auditors,  as indicated in their report included herein.  The data as of and for
the six months ended June 30, 2002 and 2003 have been derived from our unaudited
financial  statements  which,  in our  opinion,  contain all  normal,  recurring
adjustments  needed for the fair presentation of results for such periods.  With
respect to the unaudited interim consolidated  financial information for the six
months ended June 30, 2002 and 2003 included herein,  the independent  certified
public accountants have not audited such consolidated  financial information and
have not  expressed  an opinion or any other form of  assurance  with respect to
such consolidated  financial  information.  The selected financial data provided
below is not  necessarily  indicative  of our future  results of  operations  or
financial performance.











































17





Consolidated Statement of Income and                                              For the Six Months
Other Data (1):                          For the Year Ended December 31.            Ended June 30.
                                         -------------------------------    -------------------------------
                                              2001              2002             2002              2003
                                         -------------     -------------    -------------     -------------
                                      (in thousands except per share data)
                                                                                  
Revenue                                  $       8,762     $      10,297    $       5,120     $       5,565
Total costs of revenue                           4,942             5,572            2,806             2,586
                                         -------------     -------------    -------------     -------------

Gross profit                                     3,820             4,725            2,314             2,979

Income from operations                           1,199             1,841              932             1,084
Total other expense                               (503)             (471)            (313)             (329)
                                         -------------     -------------    -------------     -------------
Income  before  provision  for  income
     taxes                                         696             1,370              619               755
Total income tax expense                           314               584              280               322
                                         -------------     -------------    -------------     -------------
Net income                                         382               786              339               433
Preferred dividends                                 11               107               76                62
                                         -------------     -------------    -------------     -------------
Net income available to common
     shareholders                        $         371     $         679    $         263     $         371
                                         =============     =============    =============     =============

Per Common Share Data:
     Basic                               $         .11     $         .19    $         .08     $         .08
                                         =============     =============    =============     =============
     Diluted                             $         .11     $         .16    $         .06     $         .07
                                         =============     =============    =============     =============
Weighted Average Shares
of Common Stock Outstanding
     Basic                                   3,357,632         3,649,413        3,357,632         4,866,527
     Diluted                                 3,483,987         4,305,053        4,163,710         5,116,332



Consolidated Balance Sheet Data (1):

                                   December 31, 2002     June 30, 2003
                                   -----------------   -----------------
                                              (in thousands)
Current assets ..............      $           5,084   $           4,832
Total assets ................                 23,937              26,990
Current liabilities..........                  2,669               3,840
Shareholders' equity.........                 13,001              13,572


















18





Consolidated Statement of Cash Flows (1):

                                                                                                 For the Period
                                                       For the Year Ended December 31             Ended June 30
                                                       ------------------------------    ------------------------------
                                                            2001             2002             2002             2003
                                                       -------------    -------------    -------------    -------------
                                                                                              
Cash flow provided by (used in operating activities)   $         840    $       2,206    $       1,278    $         536
Cash flow used in investment activities                       (3,087)          (3,885)          (2,132)          (3,850)
Cash flow provided by financing activities                     2,611            3,886              689            1,576

-------
(1)  The  financial   information   reflects  the   acquisition  by  us  of  the
compression-related  assets of Dominion Michigan on March 29, 2001. The purchase
price  was  $8,000,000,  of which  $1,000,000  was paid at  closing  and the net
balance was financed by Dominion Michigan. The operations and assets of Dominion
Michigan that we acquired are included in our consolidated  financial statements
commencing on April 1, 2001.





























19



                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS


         The  following  discussion  should  be read  in  conjunction  with  the
consolidated  financial  statements  and  attached  notes  thereto and the other
financial  information  included  elsewhere in this Prospectus.  This discussion
contains forward looking  statements that involve risks and  uncertainties.  Our
actual results could differ  materially from those  anticipated in these forward
looking  statements  as a result of any number of factors,  including  those set
forth  under  the  section   entitled  "Risk  Factors"  and  elsewhere  in  this
Prospectus.

Overview

         We combine the operations of Rotary Gas Systems,  NGE Leasing and Great
Lakes  Compression.  These entities provide products and services to the oil and
gas industry and are engaged in (1) the manufacture,  sale and rental of natural
gas compressors to enhance the  productivity  of oil and gas wells,  and (2) the
manufacture,  sale and rental of flares and flare ignition systems for plant and
production facilities.  We are the parent company and provide administrative and
management support and, therefore, have expenses associated with that activity.

         We acquired the compression related assets of Great Lakes from Dominion
Michigan on March 29, 2001. This acquisition  significantly increased the number
of  compressor  units that we own and service and thereby  increased our revenue
and operating income beginning April 1, 2001.





























20





Results of Operations

 Six Months Ended June 30, 2003. Compared to the Six Months Ended June 30, 2002.
                                                                            Natural Gas
         (in thousands)            Rotary          NGE       Great Lakes      Services
                                    Gas          Leasing     Compression       Group          Total
                                -----------    -----------   -----------    -----------    -----------
                                                                            
        Six Months Ended
         June 30, 2003
Revenue                         $     1,200    $     2,070   $     2,295    $      --      $     5,565
Inter-segment revenue                 2,744             35             8           --            2,787
Gross margin                            479          1,554           946           --            2,979
Selling, general and
administrative
expense                                 460             86           135            434          1,115
Depreciation and amortization
expense                                  70            379           319             12            780
Operating income (loss)                 (51)         1,089           492           (446)         1,084
Interest expense                          3            224            89             13            329
Other income or (expense)              --                9            (9)          --             --
Provision for income tax               --             --            --              322            322
                                -----------    -----------   -----------    -----------    -----------
Net Income (loss)               $       (54)   $       874   $       394    $      (781)   $       433
                                ===========    ===========   ===========    ===========    ===========

        Six Months Ended
         June 30, 2002
Revenue                         $     1,571    $     1,059   $     2,490    $      --      $     5,120
Inter-segment revenue                 3,046           --            --             --            3,046
Gross margin                            656            761           897           --            2,314
Selling, general and
administrative
expense                                 398             80           126            240            844
Depreciation and amortization
expense                                  59            189           270             20            538
Operating income  (loss)                199            492           501           (260)           932
Interest expense                          4            186           313             20            523
Equity in earnings from joint
venture                                --              208          --             --              208
Other income or (expense)                 1              1          --             --                2
Provision for income tax               --             --            --              280            280
                                -----------    -----------   -----------    -----------    -----------
Net income (loss)               $       196    $       515   $       188    $      (560)   $       339
                                ===========    ===========   ===========    ===========    ===========


--------------------------------------------------------------------------------

         Rotary Gas Systems Operations

         Revenue  from  outside  sources  decreased  24% or $371,000 for the six
months ended June 30, 2003,  as compared to the same period ended June 30, 2002.
Because our  products  are  custom-built,  fluctuations  in revenue from outside
sources are expected.  This decrease was mainly the result of a reduction in the
sale of flare units to third parties.

         The gross margin percentage decreased from 42% for the six months ended
June 30,  2002,  to 40% for the same  period  ended June 30,  2003.  The cost of
revenue  is  comprised  of  expenses   associated   with   service,   parts  and
manufacturing  expenses.  This  decrease  resulted  mainly  from a change in the
product mix.

         Selling,  general and  administrative  expense increased $62,000 or 16%
for the six months  ended June 30,  2003,  as compared to the same period  ended
June 30, 2002. This was mainly the result of the addition of new salesmen in the
Farmington, New Mexico and West Texas areas.




21



         Depreciation  expense increased 19% or $11,000 for the six months ended
June 30, 2003, as compared to the same period ended June 30, 2002. This increase
was mainly due to the purchase of  additional  sales  vehicles,  shop and office
equipment.

         There was a decrease of $1,000 in  interest  expense for the six months
ended June 30, 2003, as compared to the same period ended June 30, 2002,  mainly
due to the reduction in loan balances on vehicles.

         NGE Leasing Operations

         Revenue from our rental of natural gas  compressors  increased  95% for
the six months ended June 30, 2003, as compared to the same period in 2002. This
increase is the result of units added to our rental  fleet.  From June 30, 2002,
to June 30, 2003, we added 137 gas compressor  units to our rental fleet,  which
included the 28 units we purchased from Hy-Bon on March 31, 2003. The operations
from the Joint  Venture,  which were  previously  accounted for using the equity
method, have been consolidated  beginning January 1, 2003. The earnings from the
units purchased from Hy-Bon is included in our consolidated  earnings  beginning
April 1, 2003.

         The gross margin percentage increased from 72% for the six months ended
June 30, 2002,  to 75% for the same period  ending 2003.  This  increase  mainly
resulted from a slight reduction in the maintenance expenses associated with the
compressor  units and also  additional  revenue  recognized from the sale of our
irrigation pump engines.

         Selling,  general and administrative expense increased $6,000 or 8% for
the six months ended June 30, 2003, as compared to the same period in 2002. This
was mainly the result of an increase in sales  commissions from increased rental
revenue.

         Depreciation  expense  increased  101% or  $190,000  for the six months
ended June 30, 2003,  as compared to the same period  ended June 30, 2002.  This
increase  was the result of new gas  compressor  rental units being added to the
rental fleet during the period.

         There was an increase in interest  expense of 20% from $186,000 for the
six months ended June 30,  2002,  to $224,000 for the same period ended June 30,
2003.  This is mainly as a result of an  increase  in bank debt used to purchase
equipment for the rental fleet.





22



         Great Lakes Compression

         Revenue  decreased 8% for the six months ended June 30, 2003,  compared
to the same period in 2002. This decrease  resulted from a decrease in the sales
of compressor units to third parties.  In the period ended June 30, 2002, we had
unit sales of  approximately  $501,000 to third parties while in the same period
2003 we had no unit sales to third parties.  At the same time our rental revenue
increased 5% and our parts sales increased 2%. Because our compressor  units are
custom-built, fluctuations in revenue from outside sources are expected.

         The gross margin percentage increased from 36% for the six months ended
June 30,  2002,  to 41% for the same  period  in 2003.  The cost of  revenue  is
comprised of expenses  associated  with the  maintenance  of the gas  compressor
rental  activity,  service,  parts and  manufacturing  expenses.  This  increase
resulted mainly from a change in the sales product mix.

         Selling,  general and administrative  expense increased by 7% or $9,000
for the six months ended June 30, 2003,  as compared to the same period in 2002.
This is mainly the result of an increase in selling expense.

                  Depreciation expense increased from $270,000 for the six
months ended June 30, 2002, to $319,000 for the same period ended June 30, 2003.
The increase is the result of equipment that was added to the rental fleet and
the replacement of several service vehicles.

         There was a decrease in interest  expense of 72% from  $313,000 for the
six months  ended June 30,  2002,  to $89,000 for the six months  ended June 30,
2003.  This  decrease  resulted  from a  reduction  of the debt owed to Dominion
Michigan.  Part of the  proceeds  from our initial  public  offering was used to
reduce debt in the amount of  $3,452,464  and our bank  financed  the  remaining
balance of $3,500,000 at a more favorable interest rate.

         Natural Gas Services Group

         Selling, general and administrative expense increased 81% from $240,000
for the six months  ended June 30,  2002,  as compared to $434,000  for the same
period ended June 30, 2003.  This was mainly the result of the added expense for
being a publicly held company such as legal fees, auditor fees, underwriters and
public relations fees.

         Amortization  and depreciation  expense  decreased 40% from $20,000 for
the six months  ended June 30,  2002,  to $12,000 for the same period ended June
30, 2003.  This mainly resulted from vehicles that were moved to our subsidiary,
Great Lakes Compression.

         Interest  expense  decreased  35% from $20,000 for the six months ended
June 30, 2002, to $13,000 for the same period ended June 30, 2003. This decrease
resulted  from a reduction in the interest rate and from bank notes for vehicles
moved to our subsidiary.




23





         Provision  for income tax is  accounted  for on a  consolidated  basis.
Therefore, the tax for all companies is included in the provision for income tax
for Natural Gas Services Group Inc. Income tax expense increased $42,000 or 15%,
which is  consistent  with and  pursuant  to  changes in state and  federal  tax
statutes and the increase in net taxable income.

Fiscal Year Ended  December 31, 2002 Compared to Fiscal Year Ended  December 31,
2001 (in thousands)

                                                                    Great Lakes   Natural Gas
                                                                    Compression    Services
                                        Rotary Gas    NGE Leasing       (1)          Group          Total
                                        -----------   -----------   -----------   -----------    -----------
                                                                                  
Twelve Months Ended December 31, 2002
Revenue                                 $     3,298   $     2,319   $     4,680   $      --      $    10,297
Gross margin                                  1,329         1,669         1,727          --            4,725
Selling, general and
administrative
expense                                         791           161           268           497          1,717
Depreciation                                    122           439           558            47          1,166
Interest expense                                  9           392           537            38            976
Other income                                      4            15          --            --               19
Equity in earnings from joint
venture                                        --             485          --            --              485
                                        -----------   -----------   -----------   -----------    -----------
Net income before income taxes          $       411   $     1,177   $       364   $      (582)   $     1,370
                                        ===========   ===========   ===========   ===========    ===========


Twelve Months Ended December 31, 2001
Revenue                                 $     3,841   $     1,519   $     3,402   $      --      $     8,762
Gross margin                                  1,231         1,076         1,513          --            3,820
Selling, general and
administrative
expense                                         962           234           297           225          1,718
Depreciation                                    104           252           423           124            903
Interest expense                                  4           395           489            36            924
Other income                                     19           130             3            45            197
Equity in earnings from joint
venture                                        --             224          --            --              224
                                        -----------   -----------   -----------   -----------    -----------
Net income before income taxes          $       180   $       549   $       307   $      (340)   $       696
                                        ===========   ===========   ===========   ===========    ===========

-----------------------------------------

(1)      We  purchased  the  compression  related  assets  of Great  Lakes  from
         Dominion Michigan on March 29, 2001. Therefore, the information for the
         period ending March 31, 2001, is not included.

Rotary Gas Systems Operations

         Revenue from outside  sources  decreased from $3,841,000 to $3,298,000,
or approximately  16%, for the twelve months ended December 31, 2001 compared to
the same period ended December 31, 2002.  Because our products are custom-built,
fluctuations in revenue from outside sources are expected.  Our main focus is to
build our rental fleet and associated lease revenue in NGE Leasing, which in the
long term is  believed to be more  profitable  and have a more stable cash flow.
For the year ended December 31, 2002,  approximately 76% of our plant output was
used to build gas compressors  for NGE Leasing.  We feel that our plant capacity
is achievable in the foreseeable  future by adding personnel and using the Great
Lakes Compression facility if an overrun occurs.




24



         Our  gross  margin  percentage  increased  to 40%  for the  year  ended
December 31, 2002,  from 32% for the same period  ended  December 31, 2001.  The
increase  resulted  mainly from a change in our  product  mix.  Specifically,  a
greater part of sales  during the period  ending  December  31,  2002,  included
flares,  parts  and  rebuilds,  which  normally  have a higher  margin  than gas
compressors  and  service.  It is  notable  that the  margin  on our  individual
compressors can vary because they are normally custom designed and manufactured.

         Selling, general and administrative expense decreased from $962,000, to
$791,000 for the year ended  December  31, 2002,  as compared to the same period
ended December 31, 2001.  This was mainly the result of the reduction of selling
expenses  related  to  the   discontinuance  of  our  air  compressor  line.  We
discontinued  this  air  compressor  line in the  development  stage in order to
concentrate on our main product, gas compression.

         Depreciation  expense increased to $122,000 for the year ended December
31,  2002,  compared to $104,000  for the year ended  December  31,  2001.  This
increase was mainly due to the purchase of additional vehicles,  shop and office
equipment.

         There was a $5,000  increase  in  interest  expense  for the year ended
December  31, 2002  compared to the same period ended  December  31, 2001.  This
increase was mainly due to financing the purchase of additional vehicles.

NGE Leasing Operations

         Revenue from rental of natural gas  compressors  increased  52% for the
year ended December 31, 2002, compared to the same period in 2001. This increase
is the result of the  increase in our rental  fleet of which 96 new  compressors
were added during the year ended  December 31, 2002, as compared to the addition
of 43 during the year ended December 31, 2001.  Rotary Gas Systems  manufactured
the compressors.

         The gross  margin  percentage  increased 1% from 70% for the year ended
December  31,  2001 to 71% for the same  period in 2002.  The cost of revenue is
comprised  mainly  of  expenses  associated  with  the  maintenance  of the  gas
compressor rental activity.

         Selling, general and administrative expense decreased from $234,000 in
the year December 31, 2001 to $161,000 for the year ended December 31, 2002.
This was mainly the result of a decrease in legal and insurance expense.

         Depreciation  expense  increased  74% from $252,000 from the year ended
December to $439,000 for the year ended December 31, 2002. This increase was the
result of new gas compressor rental units being added to the rental fleet during
the period.

         There was a decrease in  interest  expense of $3,000 for the year ended
December 31, 2002 as compared to the same period ended in 2001.




25



         Equity in earnings  from joint  venture  increased  116% from  $224,000
during  the year  ended  December  31,  2001 to  $485,000  during the year ended
December 31, 2002. This joint venture,  called Hy-Bon Rotary  Compression,  LLC,
served a mutual area of interest in which we contributed  gas  compressor  units
for rental.  The increase is due to net profits  associated  with the additional
units leased in 2002 as compared to 2001.

Great Lakes Compression

         We acquired the  compression-related  assets of Great Lakes Compression
from Dominion Michigan as of March 29, 2001.  Therefore,  there is no historical
comparative data for the year ended December 31, 2001.

Natural Gas Services Group

         Selling,  general and administrative  expense increased to $497,000 for
the year ended  December 31, 2002 from $225,000 for the year ended  December 31,
2001,  an increase of 121%.  This was mainly the result of an added  expense for
warrants granted to certain  officers and directors as  consideration  for their
guarantee  of  restructured  corporate  bank debt,  an  increase  in accrual for
officer bonuses  normally paid at year end, and additional cost incurred for our
public offering and for public relations expenses.

         Amortization and depreciation  expense  decreased from $124,000 for the
year ended  December 31, 2001 to $47,000 for the year ended December 31, 2002, a
decrease  of 62%.  This  decrease  was  mainly  the  result  of  changes  in the
accounting method for amortizing goodwill.

         Interest  expense  increased to $38,000 from $36,000 for the year ended
December  31, 2002  compared to the same period  ended  December  31, 2001, a 6%
increase.  This  increase was the result of financing  the purchase on three new
service vehicles.





























26



Critical Accounting Policies and Practices

         We have  identified  the  policies  below as critical  to our  business
operations and the  understanding of our results of operations.  In the ordinary
course of business,  we have made a number of estimates and assumptions relating
to the  reporting  of results  of  operations  and  financial  condition  in the
preparation of our financial statements in conformity with accounting principles
generally   accepted  in  the  United   States.   Actual  results  could  differ
significantly  from those estimates under different  assumptions and conditions.
We believe that the following  discussion addresses our most critical accounting
policies,  which are  those  that are most  important  to the  portrayal  of our
financial  condition and results of operations  and require our most  difficult,
subjective,  and  complex  judgments,  often  as a  result  of the  need to make
estimates about the effect of matters that are inherently uncertain.

         Our critical accounting policies are as follows:

         o        revenue recognition;

         o        estimating the allowance for doubtful accounts;

         o        accounting for income taxes;

         o        valuation of long-lived  and  intangible  assets and goodwill;
                  and

         o        valuation of inventory.

Revenue recognition

         We recognize  revenue from sales of compressors or flare systems at the
time of shipment and passage of title when collectability is reasonably assured.
We also offer certain of our customers the right to return  products that do not
function properly within a limited time after delivery.  We continuously monitor
and track such  product  returns  and we record a  provision  for the  estimated
amount  of  such  future  returns,   based  on  historical  experience  and  any
notification we receive of pending returns. While such returns historically have
been within our expectations and the provisions established, we cannot guarantee
that we will  continue to  experience  the same return rates that we have in the
past. Any significant increase in product failure rates and the resulting credit
returns could have a material  adverse  impact on our operating  results for the
period or periods in which such returns occur.

         When product is billed to customers  based on  contractual  agreements,
but has not yet been shipped, payments are recorded as deferred revenue, pending
shipment.

         Rental  and  lease  revenue  are  recognized  over  the  terms  of  the
respective lease agreements based upon the classification of the lease.




27



         Service and maintenance revenue is recognized as service is provided or
over the term of the agreement, as applicable.

Allowance for doubtful accounts receivable

         We perform  ongoing  credit  evaluations  of our  customers  and adjust
credit  limits  based upon payment  history and the  customer's  current  credit
worthiness, as determined by our review of their current credit information.  We
continuously  monitor collections and payments from our customers and maintain a
provision for estimated  credit losses based upon our historical  experience and
any specific  customer  collection  issues that we have  identified.  While such
credit losses have  historically been within our expectations and the provisions
established,  we cannot  guarantee  that we will continue to experience the same
credit loss rates that we have in the past.  Since our accounts  receivable  are
concentrated  in   approximately   three  customers  at  December  31,  2002,  a
significant  change in the  liquidity or financial  position of any one of these
customers  could have a material  adverse  impact on the  collectability  of our
accounts receivables and our future operating results.

Accounting for income taxes

         As  part  of  the  process  of  preparing  our  consolidated  financial
statements,  we are  required to estimate  our Federal  income  taxes as well as
income taxes in each of the states in which we operate. This process involves us
estimating  our actual current tax exposure  together with  assessing  temporary
differences  resulting from differing  treatment of items for tax and accounting
purposes. These differences result in deferred tax assets and liabilities, which
are  included  in our  consolidated  balance  sheet.  We must  then  assess  the
likelihood  that our deferred tax assets will be recovered  from future  taxable
income  and to the  extent we  believe  that  recovery  is not  likely,  we must
establish  a  valuation  allowance.  To the  extent  we  establish  a  valuation
allowance or increase this allowance in a period,  we must include an expense in
the tax provision in the statement of operations.

         Significant   management   judgment  is  required  in  determining  our
provision  for income  taxes,  our deferred tax assets and  liabilities  and any
valuation allowance recorded against our net deferred tax assets.

Valuation of long-lived and intangible assets and goodwill

         We assess the impairment of identifiable intangibles, long-lived assets
and related goodwill  whenever events or changes in circumstances  indicate that
the carrying value may not be recoverable.  Factors we consider  important which
could trigger an impairment review include the following:

         o        significant  underperformance  relative to expected historical
                  or projected future operating results;

         o        significant  changes in the manner of our use of the  acquired
                  assets or the strategy for our overall business; and




28



         o        significant negative industry or economic trends.

         When we determine  that the carrying value of  intangibles,  long-lived
assets and related  goodwill may not be recoverable  based upon the existence of
one or more of the above  indicators of  impairment,  we measure any  impairment
based  on a  projected  discounted  cash  flow  method  using  a  discount  rate
determined by our  management to be  commensurate  with the risk inherent in our
current business model.

         In 2002,  Statement of Financial  Accounting Standards ("FAS") No. 142,
"Goodwill and Other  Intangible  Assets"  became  effective and as a result,  we
ceased to amortize approximately $2.6 million of goodwill as of January 1, 2002.
In lieu of amortization, we are required to perform an initial impairment review
of our goodwill in 2002 and an annual impairment review  thereafter.  Based upon
valuations  we  obtained  in June  2003 and  2002 of our  reporting  units  with
goodwill, we have not recorded an impairment charge.

Inventories

         We value our  inventory  at the lower of the  actual  cost to  purchase
and/or  manufacture the inventory or the current  estimated  market value of the
inventory.  We  regularly  review  inventory  quantities  on hand  and  record a
provision  for excess and obsolete  inventory  based  primarily on our estimated
forecast of product demand and production requirements.

Recently Issued Accounting Pronouncements

         In June  2001,  the  Financial  Accounting  Statement  Board,  or FASB,
approved for issuance  Statement of Accounting  Shareholders,  or FAS 143, Asset
Retirement   Obligations.   FAS  143  establishes  accounting  requirements  for
retirement obligations associated with tangible long-lived assets,  including 1)
the  timing  of  the  liability  recognition,  2)  initial  measurement  of  the
liability,  3) allocation  of asset  retirement  cost to expense,  4) subsequent
measurement  of the liability and 5) financial  statement  disclosures.  FAS 143
requires that an asset retirement cost should be capitalized as part of the cost
of the related  long-lived asset and  subsequently  allocated to expense using a
systematic and rational method.  We adopted the statement on January 1, 2003, as
required.  The adoption of this statement did not have a material  effect on our
financial position, results of operations, or cash flows.

         In  October  2001,  the  FASB  approved  FAS  144,  Accounting  for the
Impairment  or  Disposal  of  Long-Lived  Assets.  FAS  144  replaces  FAS  121,
Accounting for the Impairment of Long-Lived  Assets and for Long-Lived Assets to
Be Disposed Of. The new accounting model for long-lived assets to be disposed of
by sale applies to all long-lived assets, including discontinued operations, and
replaces the provisions of Accounting Principles Board Opinion No. 30, Reporting
Results  of  Operations-Reporting  the  Effects  of  Disposal  of a Segment of a
Business,  for the disposal of segments of a business.  FAS requires  that those
long-lived assets be measured at the lower of carrying amount or fair value less
cost to sell,  whether  reported in  continuing  operations  or in  discontinued
operations. Therefore, discontinued operations will no longer be measured at net




29



realizable  value or include  amounts  for  operating  losses  that have not yet
occurred.  FAS 144 also  broadens the  reporting of  discontinued  operations to
include all components of an entity with  operations  that can be  distinguished
from the  rest of the  entity  and  that  will be  eliminated  from the  ongoing
operations of the entity in a disposal  transaction.  The  provisions of FAS 144
apply to us effective  January 1, 2003.  The adoption of this  statement did not
have a material effect on our financial position, results of operations, or cash
flows.

         In July  2002,  the  FASB  issued  Statement  of  Financial  Accounting
Standards  No.  146,  Accounting  for Costs  Associated  with  Exit or  Disposal
Activities, or FAS 146. FAS 146 requires companies to recognize costs associated
with exit or disposal  activities when they are incurred rather than at the date
of a commitment  to an exit or disposal  plan.  Examples of costs covered by FAS
146 include lease  termination  costs and certain employee  severance costs that
are associated with a restructuring,  discontinued operation,  plant closing, or
other exit or disposal activity.  FAS 146 is to be applied prospectively to exit
or disposal  activities  initiated  after December 31, 2002. The adoption of FAS
146 did not have a material  effect on our financial  position or results of its
operations.

         In December  2002,  the FASB issued  Statement of Financial  Accounting
Standards  No.148,  Accounting  for  Stock-Based  Compensation  - Transition and
Disclosure - an Amendment of FASB  Statement  123, or FAS 123. For entities that
change their accounting for stock-based  compensation  from the intrinsic method
to the fair value  method  under FAS 123, the fair value method is to be applied
prospectively  to those  awards  granted  after the  beginning  of the period of
adoption,   the  prospective   method.  The  amendment  permits  two  additional
transition  methods for  adoption of the fair value  method.  In addition to the
prospective  method,  the entity can choose to either (i)  restate  all  periods
presented,  retroactive  restatement method, or (ii) recognize compensation cost
from the  beginning  of the fiscal year of adoption as if the fair value  method
had been used to account for awards,  modified  prospective  method.  For fiscal
years  beginning  December 15, 2003,  the  prospective  method will no longer be
allowed.  We currently account for stock-based  compensation using the intrinsic
value  method as  proscribed  by  Accounting  Principles  Board  Opinion No. 25,
Accounting  for Stock Issued to  Employees,  and plan on  continuing  using this
method to account for stock  options;  therefore,  we do not intend to adopt the
transition  requirements  as  specified  in FAS 148. We adopted  the  disclosure
requirements as of December 31, 2002.

         In  May  2003,  the  FASB  issued  Statement  of  Financial  Accounting
Standards  No  150,   Accounting   for  Certain   Financial   Instruments   with
Characteristics of Both Liabilities and Equity, which is effective for financial
instruments  entered  into or modified  after May 31,  2003,  and  otherwise  is
effective at the beginning of the first interim period  beginning after June 15,
2003. Statement of Financial Accounting Standards No. 150, establishes standards
of how an issuer  classifies and measures  certain  financial  instruments  with
characteristics of both liabilities and equity. The adoption of this standard is
not expected to have a material effect on our consolidated financial statements.




30



Seasonality and Economic Conditions

         Our  sales  are  affected  by the  timing of  planned  development  and
construction projects by energy industry customers.

         We do not believe that inflation had a material impact upon our results
of  operations  during the six months ended June 30,  2003,  or during the years
ended December 31, 2002 and 2001.

Liquidity and Capital Resources

         We have funded our operations  through public and private  offerings of
our common and preferred stock,  subordinated debt and bank debt.  Proceeds were
primarily  used to pay debt  and to fund  the  manufacture  and  fabrication  of
additional units for our rental fleet of gas compressors.

         At June 30, 2003, we had cash and cash equivalents of $976,004, working
capital of $992,135 and non-subordinated debt of $8,987,898, of which $2,278,951
was  classified as current.  We had net cash flow from  operating  activities of
$536,246 during the first six months of 2003. This was primarily from net income
of $433,035  plus  depreciation  and  amortization  of $779,555,  an increase in
accounts  payable and accrued  liabilities of $270,867,  an increase in deferred
taxes of $321,573 and an increase in deferred  income of $270,446,  offset by an
increase in inventory of $746,248 and accounts receivable of $836,812.

         On October  24,  2002,  we paid off the note of  $6,952,464  payable to
Dominion Michigan, used for the acquisition of the compression related assets of
Great Lakes  Compression.  $3,452,464 of the funds to pay the note came from the
proceeds of our initial public  offering,  and $3,500,000  came from  additional
bank financing to be amortized over 60 months at prime plus 1%.

         We entered into a new loan agreement  with our bank,  dated as of March
26, 2003.  This  included new borrowing of $2,150,000 in the form of a term loan
with monthly  principal  payments of $35,833 with  interest at 1% over prime but
not less than 5.25% for 60 months.  The proceeds  from this new  borrowing  were
used to purchase the 28 gas compressors from Hy-Bon. The new loan agreement also
included the renewal of our line of credit for $750,000 with interest at 1% over
prime  for one year.  We have not  drawn  from the line of credit as of June 30,
2003.

         Funds from the initial  public  offering,  which  closed on October 24,
2002,  will permit us to actively  pursue adding gas  compressors  to our rental
fleet. We expect to fund additional rental units through the use of the offering
proceeds, additional bank debt and cash flow from operations.







31



         A summary of the use of proceeds from our initial public offering as of
June 30, 2003, is as follows:


         o        $3,458,464 to reduce indebtedness;

         o        $2,577,870 for the  manufacture of gas  compressors  placed in
                  our rental fleet; and

         o        $492,836 in temporary  investments  consisting of a bank money
                  market account.


Market Risk

         We significantly rely upon debt financing provided by various financial
institutions.  Most of these instruments contain interest provisions that are at
least a  percentage  point  above  the  published  prime  rate.  This  creates a
vulnerability to us relative to the movement of the prime rate. Should the prime
rate increase,  our cost of funds will increase and affect our ability to obtain
additional  debt.  We have not engaged in any hedging  activities to offset such
risks.


                                    BUSINESS

History and Organization

         We were  incorporated on December 17, 1998 and initially  operated as a
holding  company of Flare King,  Inc.,  Hi-Tech  Compressor  Company,  L.C., NGE
Leasing,  Inc.  and CNG Engines  Company.  In July 2000,  Flare King and Hi-Tech
merged and now operate as Rotary Gas Systems,  Inc. Effective March 31, 2000, we
sold CNG.

         On March 29, 2001,  we acquired,  through our  subsidiary,  Great Lakes
Compression,  Inc., all of the  compression-related  assets of Dominion Michigan
Petroleum  Services,  Inc.,  an  unaffiliated  company that is a  subsidiary  of
Dominion  Resources,  Inc.  and  that  was in  the  business  of  manufacturing,
fabricating, selling, leasing and maintaining natural gas compressors. As a part
of the transaction,  an affiliate of Dominion Michigan  committed to purchase or
to  enter  into  five  year  leases  for  compressors   totaling  five  thousand
horsepower. The purchases or leases are to be made by December 31, 2005.

         On October 24, 2002, we closed our initial public offering  pursuant to
a registration statement that was declared effective on October 21, 2002. In the
offering,  we sold a total of 1,500,000  shares of our common stock and warrants
to purchase  1,500,000  shares of our common stock at a total of $5.25 per share
and  warrant for an  aggregate  amount  $7,875,000.  After  deducting  the total
expenses of the  offering,  we received net offering  proceeds of  approximately
$6,529,170.

         On March 27,  2003,  we acquired  28  compressor  packages  from Hy-Bon
Engineering Company, Inc. for $2,150,000.




32



Company Business

Overview

         We provide  equipment and services to the natural gas and oil industry.
We manufacture,  fabricate,  sell and lease natural gas compressors that enhance
the  production  of oil and gas wells and we provide  maintenance  services  for
those  compressors.  We define a natural gas  compressor as a mechanical  device
with one basic goal - to deliver gas at a pressure  higher than that  originally
existing. It may be powered by a natural gas burning engine or an electric motor
to  accommodate  different  applications.   Gas  compression  is  undertaken  to
transport and distribute  natural gas to pipelines.  Pipeline pressures vary and
with the  addition  of new  wells  to the  pipeline,  the  need for  compression
increases.  We also manufacture and sell flare tips and ignition systems for oil
and gas plant and  production  facilities.  We define a flare tip as a burner on
the upper end of a flare stack that is designed to combust waste gases to assure
a clean  environment.  An ignition  system is a pilot light or a spark generator
that assures continuous  ignition of the waste gases going through the burner in
the flare tip.

         We primarily lease natural gas compressors. As of June 30, 2003, we had
354 natural gas compressors under lease to third parties.

         We also fabricate natural gas compressors for our customers,  designing
compressors to meet unique specifications dictated by well pressures, production
characteristics and particular applications for which compression is sought.

         We have  established an exchange and rebuild program to attempt to help
minimize  costs and maximize  revenue for our customers.  Under the program,  we
work  with  maintenance  and  operating  personnel  of a  customer  to  identify
equipment for exchange.  When we receive a compressor for exchange  because of a
maintenance problem, we deliver to our customer a replacement compressor at full
price. We then rebuild the exchange compressor and credit our customer an amount
based on the  value of the  rebuilt  compressor.  We also  offer a  retrofitting
service by repackaging a customer's  compressor with a compressor that meets our
customer's changed conditions.

         We design,  manufacture,  install and service  flare stacks and related
ignition and control  devices for onshore and offshore  burning of gas compounds
such as hydrogen sulfide,  carbon dioxide,  natural gas and liquefied  petroleum
gases.

         We have  manufacturing and fabrication  facilities located in Lewiston,
Michigan,  and Midland,  Texas,  where we manufacture and fabricate  natural gas
compressors. We design and manufacture natural gas flare systems, components and
ignition  systems  in our  facility  in  Midland,  Texas,  for use in  oilfield,
refinery and petrochemical plant applications.

         We currently  provide our  products and services to a customer  base of
oil  and  gas  exploration  and  production  companies  operating  primarily  in
Colorado, Kansas, Louisiana, Michigan, New Mexico, Oklahoma, Texas and Wyoming.




33



         We  maintain  our  principal  office at 2911  South  County  Road 1260,
Midland, Texas 79706 and our telephone number is (915) 563-3974.

Industry Background

         Our  products  and  services  are  related to the oil and  natural  gas
industries.  The oil and natural gas  industry is  comprised  of several  large,
well-capitalized companies accounting for the majority of the market. There also
exist a large number of small  privately held companies  making up the remainder
of  the  market.   According  to   information   from  the  Energy   Information
Administration there is a growing demand for natural gas in this country.

         We believe that there will continue to be a growing  demand for natural
gas.  Because of this,  demand for our  products  and  services  is  expected to
continue to rise as a result of:

         o        the  increasing  demand  for  energy,  both  domestically  and
                  abroad;

         o        environmental  considerations  which provide strong incentives
                  to use natural gas in place of other carbon fuels;

         o        the cost savings of using natural gas rather than  electricity
                  for heat generation;

         o        implementation of international environmental and conservation
                  laws;

         o        the aging of producing natural gas reserves worldwide; and

         o        the extensive supply of undeveloped natural gas reserves.

         By using a  compressor,  the  operator of a natural gas well is able to
increase the pressure of natural gas from a well to make it economically  viable
by enabling gas to continue to flow in the pipeline to its destination.  We feel
that we are  well  positioned  through  our gas  compression  and  flare  system
activities to take advantage of the aging of reserves and the development of new
reserves.

The Compression Business

         Natural gas compressors  are used in a number of applications  intended
to enhance the productivity of oil and gas wells, gas  transportation  lines and
processing  plants.  Compression  equipment  is  often  required  to boost a the
production of a well to economically viable levels and enable gas to continue to
flow in the  pipeline to its  destination.  We believe that most  producing  gas
wells in North America, at some point, will utilize compression.  As of December
31,  2001,  the  Energy  Information  Administration  reported  that  there were
approximately  367,000  producing  gas and gas  condensate  wells in the  United
States. The states where we currently operate accounts for approximately 194,000
of these wells.




34



The Leasing Business

         We primarily lease natural gas compressors. As of June 30, 2003, we had
312 natural gas compressors  totaling  approximately 38,000 horsepower leased to
29 third parties, compared to 240 natural gas compressors totaling approximately
32,000  horsepower  leased  to 24 third  parties  at June 30,  2002.  Of the 312
natural gas compressors, 46 were leased to Dominion Michigan and its affiliates.

         As a part  of our  leasing  business,  in  2000  we  formed  a  limited
liability   company,   Hy-Bon  Rotary  Compression  LLC,  ("HBRC")  with  Hy-Bon
Engineering  Company,  Inc.,  a  non-affiliated  company,  to lease  natural gas
compressors.  We formed HBRC to lease  compressors  to a customer with which the
non-affiliated company had a relationship.  The non-affiliated company owned 50%
and we owned 50% of HBRC. The non-affiliated company appointed a majority of the
persons who serve as managers of HBRC.

         On March 27, 2003,  to be effective  January 1, 2003,  we purchased and
Hy-Bon sold to us 28 of Hy-Bon's compressor packages. In consideration therefor,
we paid Hy-Bon  $2,150,000.00.  The  $2,150,000.00  was  borrowed by us from our
current lender.

         Hy-Bon  withdrew as a member of HBRC  effective  as of January 1, 2003.
We, as the other  member of HBRC,  will  retain  all  assets of HBRC which as of
December 31,  2002,  had an unaudited  aggregate  value of $346,511.  We plan to
dissolve HBRC and we have agreed not to operate using the name Hy-Bon.

         In addition  to 81 separate  written  maintenance  agreements  covering
non-owned compressor units that we had entered into at June 30, 2003, we provide
maintenance as a part of our compressor  leases.  Many companies and individuals
are turning to leasing of  equipment  instead of  purchasing.  Leasing  does not
require the purchaser to make large capital expenditures for new equipment or to
obtain financing through a lending institution. This frees the customer's assets
for developing the customer's business.  Our leases generally have initial terms
of from six to 24 months and then continue on a month-to-month basis. The leases
with Dominion Exploration have an initial five year term. Lease rentals are paid
monthly.  At the end of a lease term,  the  customer may continue to pay monthly
rentals on the equipment, or we may require them to return it to us.

         Changing well and pipeline  pressures and conditions over the life of a
well often require  producers to reconfigure  their compressor units to optimize
the well  production  or pipeline  efficiency.  Because the  equipment is highly
technical,  a trained staff of field  service  personnel,  a  substantial  parts
inventory and a diversified fleet of natural gas compressors are often necessary
to perform reconfiguration  functions in an economic manner. It is not efficient
or, in many cases,  economically  possible for independent natural gas producers
to maintain  reconfiguration  capabilities  individually.  Also,  our management
believes that, in order to streamline  their operations and reduce their capital
expenditures  and other costs, a number of major oil and gas companies have sold
portions of their domestic energy reserves to independent  energy  producers and
have  outsourced  many  facets  of  their  operations.  We  believe  that  these
initiatives  are  likely  to  contribute  to  increased   rental  of  compressor
equipment.  For that reason, we have created our own compressor-rental  fleet to
take advantage of the rental market,  and intend to expand our fleet by spending
approximately $5,700,000 on natural gas compressors over the next 12 months.




35



         The size, type and geographic  diversity of our rental fleet enables us
to provide our customers with a range of compression units that can serve a wide
variety of applications, and to select the correct equipment for the job, rather
than the customer  trying to fit the job to its own  equipment.  We base our gas
compressor  rental rates on several factors,  including the cost and size of the
equipment,  the type and  complexity  of service  desired by the  customer,  the
length of contract,  and the inclusion of any other  services  desired,  such as
leasing, installation, transportation and daily operation.

Custom Fabrication

         We  also  engineer  and  fabricate  natural  gas  compressors  for  our
customers to meet their unique specifications based on well pressure, production
characteristics and the particular applications for which compression is sought.
In  order  to meet  the  ongoing  needs  of our  customers  for  whom we  custom
fabricate,  we  offer  a  variety  of  services,   including:  (i)  engineering,
manufacturing and fabrication of the compressors;  (ii) installation and testing
of compressors; (iii) ongoing performance review to assess the need for a change
in compression:  and (iv) periodic maintenance and parts replacement. We receive
revenue for each service.

Maintenance

         Although  natural gas compressors  generally do not suffer  significant
technological  obsolescence,  they do require  routine  maintenance and periodic
refurbishing  to  prolong  their  useful  life.  Routine  maintenance   includes
alignment and compression  checks and other parametric  checks indicate a change
in the condition of the compressors. In addition, oil and wear-particle analysis
is  performed  on all  compressors.  Overhauls  are  done  on a  condition-based
interval  or  a  time-based  schedule.  Based  on  our  past  experience,  these
maintenance  procedures  maximize  component  life  and  unit  availability  and
minimize downtime.

         As of June 30, 2003, we had written  maintenance  agreements with third
parties relating to 81 compressors.  Each written maintenance  agreement expires
on December 31, 2005.  During our six months ended June 30, 2003,  and the years
ended December 31, 2002 and 2001, we received revenue of approximately $534,000,
$1,058,000 and $704,000 (approximately 11%, 10% and 8% of our total consolidated
revenue), respectively, from maintenance agreements.

Exchange and Rebuild Program

         We have  established an exchange and rebuild program to attempt to help
minimize costs and maximize our customers' revenue. This program is designed for
operations  with rotary screw  compressors  where  downtime and lost revenue are
critical.




36



         Under  the  program,  we  work  with  our  customer's  maintenance  and
operating  personnel to identify and quantify  equipment for  exchange.  When we
receive a  compressor  for exchange  due to a problem  with the  compressor,  we
deliver to our customer a replacement  compressor at full price. We then rebuild
the exchange compressor and credit our customer with an amount based on the core
value of the compressor we rebuild.

         This program  enables our customers to obtain  replacement  compressors
and shorten the time that the customer is unable to realize gas production  from
one or more wells because of the lack of a compressor.

         During the six months ended June 30, 2003, and years ended December 31,
2002 and 2001,  we received  revenue of  approximately  $292,000,  $630,000  and
$402,000  (approximately  6%,  6%  and  5% of our  total  consolidated  revenue)
respectively,  from exchanging and rebuilding rotary screw compressors for third
parties.

Retrofitting Service

         We recognize the capital  invested by our customers in compressors.  We
also  recognize  that   producing   wells  and  gas  gathering   systems  change
significantly during their operating life. To meet these changing conditions and
help our customers  maximize  their  operating  income,  we offer a retrofitting
service by repackaging a customer's  compressor with a compressor that meets our
customer's changed conditions.

The Flare Business

         The  drilling  for and  production  of oil and gas  results  in certain
gaseous hydrocarbon  byproducts that generally must be burned off at the source.
Although   flares  and  flare  systems  have  been  part  of  the  oilfield  and
petrochemical environment for many years, increasing regulation of emissions has
resulted in a significant  increase in demand for flare systems of  increasingly
complex  design  meeting  new  environmental  regulations.  Growth is  primarily
related,  as is the case for most industries  connected with oil and gas, to the
price of oil and gas and new environmental regulations.

         We design,  manufacture,  install and service  flare stacks and related
ignition  and  control  devices  for the  onshore  and  offshore  burning of gas
compounds such as hydrogen  sulfide,  carbon dioxide,  natural gas and liquefied
petroleum gases. We produce two ignition systems for varied applications:  (a) a
standing jet-like pipe for minimal fuel consumption,  with a patented electronic
igniter; and (b) an electronic sparked ignition system. Flare tips are available
in carbon steel as well as many grades of stainless steel alloys. The stacks can
be free  standing,  guyed,  or trailer  mounted.  The flare  stack and  ignition
systems  use a  smokeless  design  for  reduced  emissions  to  meet  or  exceed
government   regulated   clean  air   standards.   Our  product  line   includes
solar-powered  flare ignition systems and thermocouple  control systems designed
to detect the loss of combustion in the product  stream and reignite the product
stream.  These products contain  specially-designed  combustion tips and utilize
pilot flow Venturi tubes to maximize the  efficient  burning of waste gas with a
minimal  use of pilot or  assist  gas,  thereby  minimizing  the  impact  on the
environment  of the  residual  output.  Increased  emphasis  on "clean  air" and
industry  emissions has had a positive effect on the flare  industry.  Our broad
energy industry  experience has allowed us to work closely with our customers to
seek cost-effective solutions to their flare requirements.




37



         During the six months ended June 30,  2003,  and during the years ended
December 31, 2002 and 2001, we sold 30, 39 and 54 flare  systems,  respectively,
to our  customers  generating  approximately  $309,000,  $759,000  and  $703,000
(approximately  6%, 7 % and 8% of our total  consolidated  revenue)  in revenue,
respectively.

Major Customers

         During  the six  months  ended June 30,  2003,  sales to one  customer,
Dominion Michigan, amounted to approximately 31%; during our year ended December
31, 2002, sales to one customer,  Dominion  Michigan,  amounted to approximately
30% and during our year ended December 31, 2001, sales to one customer, Dominion
Michigan,  amounted to approximately 26% of our consolidated  revenue.  No other
single  customer  accounted  for more  than 10% of our  revenue  in any of those
periods.

Backlog

         We had a backlog of  approximately  $383,000  as of June 30,  2003,  as
compared  to  approximately  $692,000  as of the same date in 2002.  The reduced
backlog at June 30, 2003 results from us having more compressors being built for
leasing rather than for sale. Backlog consists of firm customer orders for which
a  purchase  order  has  been  received,  satisfactory  credit  or  a  financing
arrangement  exists,  and  delivery is  scheduled.  Our backlog at June 30, 2003
includes  only sales to outside  third  parties and does not include the backlog
that we may receive  from the lease or sale of  compressors  over the next three
years to Dominion Exploration.

Continuing Product Development

         We engage in a continuing  effort to improve our  compressor  and flare
operations.  Continuing  development  activities in this regard  include new and
existing  product  development  testing  and  analysis,  process  and  equipment
development and testing, and product performance improvement.  We also focus our
activities on reducing overall costs to the customer,  which include the initial
capital cost for  equipment,  the monthly  leasing cost if  applicable,  and the
operating costs associated with such equipment,  including  energy  consumption,
maintenance costs and environmental emissions.

         During the six months ended June 30,  2003,  and during our years ended
December 31, 2002 and December 31, 2001,  we did not spend any material  amounts
on research and development  activities.  Rather, product improvements were made
as a part of our normal operating activities.




38



Sales and Marketing

         General.  We  conduct  our  operations  from  three  locations.   These
locations,  with exception of our executive  offices,  maintain an inventory for
local customer  requirements,  trained service  technicians,  and  manufacturing
capabilities to provide quick delivery and service for our customers.  Our sales
force also operates out of these locations and focuses on communication with our
customers and potential  customers  through  frequent direct contact,  technical
assistance, print literature, direct mail and referrals. Our sales and marketing
is performed by seven employees.

         Additionally,  our  personnel  coordinate  with each  other to  develop
relationships  with  customers  who  operate  in  multiple  regions.  Our  sales
personnel maintain  intensive contact with our operations  personnel in order to
respond  promptly to and address  customer  needs.  Our  overall  sales  efforts
concentrate on  demonstrating  our  commitment to enhancing the customer's  cash
flow through enhanced product design, fabrication, manufacturing,  installation,
customer service and support.

         During the six months ended June 30,  2003,  and during the years ended
December 31, 2002 and 2001, we spent approximately $33,000, $49,000 and $56,000,
respectively, on advertising.

         Compression Activity.  The compression marketing program emphasizes our
ability to design and fabricate  natural gas  compressors in accordance with the
customer's unique  specifications  and to provide all necessary service for such
compressors.

         Flare Systems Activity.  The flare systems marketing program emphasizes
our ability to design, manufacture,  install and service flares with the updated
technology.

Competition

         Compression   Activity.   The  natural  gas  compression   business  is
competitive.  We experience  competition  from companies with greater  financial
resources.  On a regional basis, we experience  competition from several smaller
companies that compete  directly with us. We have a number of competitors in the
natural gas compression  segment,  but we do not have sufficient  information to
determine our competitive position within that group. We believe that we compete
effectively on the basis of price,  customer  service,  including the ability to
place personnel in remote  locations,  flexibility in meeting customer needs and
quality and reliability of our compressors and related services.

         Compressor  industry  participants can achieve  significant  advantages
through  increased  size  and  geographic  breadth.  As  the  number  of  rental
compressors in our rental fleet  increases,  the number of sales,  support,  and
maintenance  personnel  required  and the minimum  level of  inventory  does not
increase commensurately.  As a result of economies of scale, we believe that we,
with a growing rental fleet,  have  relatively  lower operating costs and higher
margins than smaller companies.




39



         Flare Systems Activity.  The flare business is highly  competitive.  We
have a number of  competitors in the flare systems  segment,  but we do not have
sufficient  information to determine our competitive position within that group.
We believe  that we are able to compete by our  offering  products  specifically
engineered for the customer's needs.

Employees

         As of June 30,  2003,  we had 72 full time  employees  and 1  part-time
employee.  No employees are  represented by labor unions and we believe that our
relations with our employees are satisfactory.

Liability and Other Insurance Coverage

         Our equipment and services are provided to customers who are subject to
hazards  inherent in the oil and gas  industry,  such as  blowouts,  explosions,
craterings,  fires,  and oil spills.  We maintain  liability  insurance  that we
believe is customary in the industry. We also maintain insurance with respect to
our  facilities.  Based  on our  historical  experience,  we  believe  that  our
insurance coverage is adequate.

Government Regulation

         We  are  subject  to  numerous  federal,   state  and  local  laws  and
regulations  relating  to the  storage,  handling,  emission  and  discharge  of
materials  to  the  environment,   including  the  Comprehensive   Environmental
Response, Compensation and Liability Act, the Clean Water Act, the Clean Air Act
and the Resource  Conservation  and Recovery Act. As a result of our operations,
we generate or manage hazardous wastes, such as solvents,  thinner, waste paint,
waste  oil,  washdown  wastes  and  sandblast  material.  We  currently  spend a
negligible  amount  each year to dispose of the  wastes.  Although we attempt to
identify and address contamination before acquiring properties,  and although we
attempt  to  utilize  generally  accepted  operating  and  disposal   practices,
hydrocarbons  or other wastes may have been  disposed of or released on or under
properties owned,  leased, or operated by us or on or under locations where such
wastes have been taken for disposal. These properties and the wastes or remedial
sites where they have been released might have to be remediated at our expense.

         We believe  that our  existing  environmental  control  procedures  are
adequate  and we have no  current  plans for  substantial  operating  or capital
expenditures relating to environmental control requirements.  We believe that we
are in substantial  compliance with  environmental laws and regulations and that
the phasing in of emission  controls and other known regulatory  requirements at
the rate currently  contemplated  by such laws and  regulations  will not have a
material adverse effect on our financial condition or operational results.  Some
risk of  environmental  liability  and other costs are inherent in the nature of
our business,  however,  and there can be no assurance that environmental  costs
will not rise.  Moreover,  it is  possible  that  future  developments,  such as
increasingly strict requirements and environmental laws and enforcement policies
thereunder,  could lead to material  costs of  environmental  compliance  by us.
While we may be able to pass on the additional  cost of complying with such laws
to our  customers,  there can be no  assurance  that  attempts  to do so will be
successful.




40



Patents, Trademarks and Other Intellectual Property

         We  believe  that  the  success  of our  business  depends  more on the
technical  competence,  creativity and marketing abilities of our employees than
on any individual patent, trademark, or copyright.  Nevertheless, as part of our
ongoing research,  development and manufacturing activities, we have a policy of
seeking  patents when  appropriate  on  inventions  concerning  new products and
product  improvements.  We  currently  own two United  States  patents  covering
certain flare system technologies, which expire in May 2006 and in January 2010,
respectively. We do not own any foreign patents. Although we continue to use the
patented  technology and consider it useful in certain  applications,  we do not
consider these patents to be material to our business as a whole.

Suppliers and Raw Materials

         With respect to our flare  system and  compressor  operations,  our raw
materials  used consist of cast and forged iron and steel.  Such  materials  are
generally  available  from a number of suppliers,  and  accordingly,  we are not
dependent on any particular  supplier for these new  materials.  We currently do
not have long term contracts  with our suppliers of raw  materials,  but believe
our sources of raw  materials  are reliable and adequate for our needs.  We have
not experienced any significant supply problems in the past.

         Certain of our  components of our  compressors  are obtained  primarily
from four suppliers.  If one of our current major  suppliers  should curtail its
operations  or be  unable  to meet our  needs,  we  would  encounter  delays  in
supplying our customers with compressors until an alternative  supplier could be
found. We may not be able to find acceptable alternative suppliers.

Property

         We maintain our executive  offices in Midland,  Texas. This facility is
owned  by us  and  is  used  for  manufacturing,  fabrication,  remanufacturing,
operations,   testing,  warehousing  and  storage,  general  and  administrative
functions and training.

         The facility in Midland is an approximately 24,600 square foot building
that provides us with sufficient  space to  manufacture,  fabricate and test our
equipment on site and has land available to expand the building when needed. Our
current  facilities  in Midland are  anticipated  to provide us with  sufficient
space and  capacity  for at least the next  year and thus  there are no  current
plans to open new  locations,  unless  they are  acquired  as a result of future
acquisitions.

         We also own facilities in Lewiston, Michigan that consist of a total of
approximately  15,360 square feet.  Approximately  9,360 square feet are used as
offices  and a repair  shop and  approximately  6,000  square  feet are used for
manufacturing and fabrication of compressors and storage.




41



         We also own an  approximate  4,100 square foot building in Midland that
is leased  at a  current  rate of  $1,050  per  month to an  unaffiliated  party
pursuant  to a lease  that  terminates  in May 2005.  This  facility  previously
contained our executive offices and manufacturing and fabrication operations.

         We believe that our  properties  are generally  well  maintained and in
good condition.


































42


                                LEGAL PROCEEDINGS

         There are no pending or, to our  knowledge,  threatened  claims against
us.  However,  from time to time,  we  expect to be  subject  to  various  legal
proceedings, all of which are of an ordinary or routine nature and incidental to
our operations. Such proceedings have not in the past, and we do not expect they
will in the future  have,  a material  impact on our  results of  operations  or
financial condition.

                    WHERE YOU CAN FIND ADDITIONAL INFORMATION

         We  have  filed  with  the   Securities   and  Exchange   Commission  a
registration  statement  on Form SB-2  under the  Securities  Act for the common
stock  sold in this  offering.  This  prospectus  does  not  contain  all of the
information  set  forth  in the  registration  statement  and  the  accompanying
exhibits and schedules.  For further  information about us and our common stock,
we refer you to the  registration  statement and the  accompanying  exhibits and
schedules. Statements contained in this prospectus regarding the contents of any
contract or any other document to which we refer are not  necessarily  complete.
In each  instance,  reference  is made to the copy of the  contract  or document
filed  as an  exhibit  to the  registration  statement,  and each  statement  is
qualified  in all  respects  by  that  reference.  Copies  of  the  registration
statement and the accompanying  exhibits and schedules may be inspected  without
charge at the public  reference  facilities  maintained  by the  Securities  and
Exchange  Commission at room 1024,  450 Fifth  Street,  N.W.,  Washington,  D.C.
20549,  and at the regional  offices of the Securities  and Exchange  Commission
located at 500 West Madison Street, Suite 1400, Chicago,  Illinois 60661. Copies
of these materials may be obtained at prescribed rates from the public reference
room of the Securities  and Exchange  Commission at room 1024, 450 Fifth Street,
N.W., Washington, D.C. 20549. You may obtain information on the operation of the
public  reference  room by calling the  Securities  and Exchange  Commission  at
1-800-SEC-0330. The Securities and Exchange Commission maintains a web site that
contains  reports,  proxy  and  information  statements  and  other  information
regarding  registrants that file electronically with the Securities and Exchange
Commission. The address of the site is http://www.sec.gov.

         We are subject to the reporting requirements of the Securities Exchange
Act of 1934, and we file annual, quarterly and special reports, proxy statements
and other information with the Securities and Exchange Commission.  You may read
and copy any document that we file at the Securities  and Exchange  Commission's
public  reference  rooms in  Washington,  D.C., New York, New York, and Chicago,
Illinois.  Please call the Securities  Exchange Commission at 1-800-SEC-0330 for
further  information  on the public  reference  rooms.  Our SEC filings are also
available to you free of charge at the Securities Exchange Commission's web site
at http://www.sec.gov.










43



                          MARKET FOR OUR SECURITIES AND
                           RELATED STOCKHOLDER MATTERS

         Our common stock and warrants are quoted on the American Stock Exchange
under the symbols NGS and NGS.WS,  respectively.  The following table sets forth
from October 21, 2002, (the first day of trading) through December 31, 2002, and
for the first and second quarters of 2003, the high and low sales prices for our
common stock and warrants as reported by the American Stock Exchange.

                                           Common Stock            Warrants
                                       -------------------   -------------------
                                         High        Low       High        Low
                                       --------   --------   --------   --------
Fourth Quarter 2002 (from October 21)  $   4.25   $   3.35   $   0.90   $   0.25
First Quarter 2003                         4.28       3.75       0.80       0.27
Second Quarter 2003                        7.25       3.65       1.55       0.22

         As of June 30, 2003,  there were  approximately 22 holders of record of
our common stock and 2 holders of record of our warrants.  The number of holders
of record does not include holders whose securities are held in street name.

         We have never  declared or paid any dividends on our common  stock.  We
anticipate that, for the foreseeable  future,  all earnings will be retained for
use in our business and no cash  dividends will be paid to holders of our common
stock.  If we were to pay cash  dividends in the future on the common stock,  it
would be dependent upon our:

         o        financial condition,

         o        results of operations,

         o        current and anticipated cash requirements,

         o        plans for expansion,

         o        restrictions, if any, under debt obligations,

         as well as other factors that our board of directors  deemed  relevant.
Our  agreement  with our bank contains  provisions  that restrict us from paying
dividends on our common stock.

         We have 343,654 shares of our 10% Convertible  Series A Preferred Stock
outstanding. Holders of that stock are entitled to cash dividends paid quarterly
at a rate  equal  to 10%  per  annum  or  $0.325  per  share  annually.  The 10%
Convertible Series A Preferred Stock will automatically  convert into our common
stock if our common stock trades for 20  consecutive  trading days at a price of
$6.50 or more per share.  As of June 30, 2003,  we have issued  38,000 shares of
common  stock  as a  result  of the  conversion  of  38,000  shares  of our  10%
Convertible Series A Preferred Stock.









44



                                   MANAGEMENT

Executive Officers and Directors

         The table below contains  information about our executive  officers and
directors:

         Name                         Age        Position

         Wallace O. Sellers(1)(2)      73        Director, Chairman
         Wayne L. Vinson               44        Director, President and Chief
                                                 Executive Officer
         Charles G. Curtis(1)(2)       70        Director
         James T. Grigsby(1)(2)        55        Director
         Wallace C. Sparkman           73        Director
         Gene A. Strasheim(1)(2)       62        Director
         Richard L. Yadon(1)(2)        45        Director
         S. Craig Rogers               41        Vice President
         Earl R. Wait                  59        Chief Financial Officer and
                                                 Treasurer
         Scott W. Sparkman             41        Secretary
         ---------------------

         (1)      Member of our audit committee
         (2)      Member of our compensation committee

         The  Board of  Directors  has been  divided  into  three  classes  with
directors serving staggered three-year terms. With respect to the existing Board
of  Directors,  the terms of Messrs.  Sparkman,  Vinson and Yadon will expire in
2004,  the terms of Messrs.  Curtis,  Sellers and Strasheim will expire in 2005,
and the term of Mr.  Grigsby  will  expire in 2006.  All  officers  serve at the
discretion of the Board of Directors.

         The following sets forth biographical information for at least the past
five years for our directors and executive officers.

         Wallace O.  Sellers is one of our founders and has served as a director
and the Chairman of our Board of Directors  since  December 17, 1998, and as the
Chairman of the Board of Directors  of Great Lakes  Compression  since  February
2001.  Although Mr. Sellers retired in December 1994, he served as Vice-Chairman
of the Board and  Chairman  of the  Executive  Committee  of  Enhance  Financial
Services, Inc., a financial guaranty reinsurer,  from January 1995 to 2001. From
November 1986 to December 1991 he was President and Chief  Executive  Officer of
Enhance.  Mr.  Sellers  serves as a director  of  Danielson  Holding  Corp.,  an
insurance  holding  company which is a reporting  company  under the  Securities
Exchange  Act of 1934.  From 1951 to 1986 Mr.  Sellers  was  employed by Merrill
Lynch,  Pierce,  Fenner & Smith  Incorporated,  an investment banker, in various
capacities,  including Director of the Municipal and Corporate Bond Division and
Director  of  the  Securities  Research  Division.   Immediately  prior  to  his
retirement  from Merrill Lynch,  he served as Senior Vice President and Director
of Strategic  Development.  Mr. Sellers received a BA degree from the University
of New Mexico,  an MA degree from New York  University and attended the Advanced
Management Program at Harvard  University.  Mr. Sellers is a Chartered Financial
Analyst.




45



         Wayne L. Vinson has served as one of our directors since April 2000, as
our President and Chief Executive Officer since July 2001, as our Executive Vice
President  from October 31, 2000 to July 2001,  as the  President of Rotary (and
its predecessor, Hi-Tech) since February 1994, as a director of NGE between 1996
and 1998 and as  Executive  Vice  President  of Great  Lakes  Compression  since
February  2001. He also served as our Vice  President from April 2000 to October
2000.  From January 1990 to June 1995,  Mr. Vinson served as Vice  President and
since June 1995 he has served as President of Vinson Operating  Company,  an oil
and gas well  operator.  Mr.  Vinson has more than 22 years of experience in the
energy services industry.

         Charles G. Curtis has been one of our directors since April 2001. Since
1992,  Mr. Curtis has been the President and Chief  Executive  Officer of Curtis
One, Inc.  d/b/a/ Roll Stair, a manufacturer of aluminum and steel mobile stools
and mobile  ladders.  From 1988 to 1992,  Mr. Curtis was the President and Chief
Executive Officer of Cramer, Inc. a manufacturer of office furniture. Mr. Curtis
has a B.S.  degree from the United  States Naval  Academy and a MSAE degree from
the University of Southern California.

         James T. Grigsby has served as one of our  directors  since 1999 and as
one of the directors of Great Lakes Compression since February 2001. Since 1996,
Mr.  Grigsby has been a director of and a consultant  to Blue River Paint Co., a
development stage environmental  friendly coatings technology company. From 1996
to 1997, Mr. Grigsby was a consultant to Outlook Window Partnership,  a regional
wood window manufacturer. From 1989 to 1996, Mr. Grigsby was President and Chief
Executive  Officer of Seal Right Windows,  Inc. and Chief  Executive  Officer of
Oldach  Window  Corp.,  manufacturers  of wood,  wood-clad and vinyl windows and
doors.  Mr. Grigsby  received a BS degree from the University of Michigan and an
MBA degree from Stanford University.

         Wallace C.  Sparkman is one of our  founders,  has served as one of our
directors  since 2003, has been the President of NGE since July 2001, a director
of NGE since February  1996,  and the President of Rotary (and its  predecessor,
Flare King) from April 1993 to April 1997. Mr.  Sparkman served as our President
from May 2000 to July 2001 and as the President of Great Lakes  Compression from
February 2001 to July 2001. Mr. Sparkman was Vice President of NGE from February
1996 to  November  1999.  Since  December  1998,  Mr.  Sparkman  has  acted as a
consultant to our Board of Directors. From 1985 to 1998, Mr. Sparkman acted as a
management  consultant  to various  entities and acted as a principal in forming
several  privately-owned  companies.  Mr.  Sparkman was a co-founder of Sparkman
Energy  Corporation,  a natural gas gathering and transmission  company, in 1979
and served as its Chairman of the Board,  President and Chief Executive  Officer
until 1985 when ownership control changed.  From 1968 to 1979, Mr. Sparkman held
various executive positions and served as a director of Tejas Gas Corporation, a
natural gas gathering and transmission  company.  At the time of his resignation
from  Tejas Gas  Corporation  in 1979,  Mr.  Sparkman  was  President  and Chief
Executive  Officer.  Mr.  Sparkman has more than 34 years of  experience  in the
energy service industry.




46



         Gene A. Strasheim has served as one of our directors since 2003.  Since
2001,   Mr.   Strasheim   has   been   a   financial   consultant   to   Skyline
Electronics/Products,  a  manufacturer  of  circuit  boards  and large  remotely
controlled  digital  interstate  highway signs. From 1992 to 2001, Mr. Strasheim
was the Chief Financial  Officer of Skyline  Electronics/Products.  From 1985 to
1992, Mr. Strasheim was the Vice  President-Finance  and Treasurer of CF&I Steel
Corporation. Prior to that, Mr. Strasheim was the Vice President-Finance for two
companies and was a partner with Deloitte  Haskins & Sells,  a large  accounting
firm. Mr. Strasheim  practiced as a Certified Public  Accountant in three states
and has a BS degree from the University of Wyoming.

         Richard L. Yadon has served as one of our  directors  since  2003.  Mr.
Yadon is one of the original founders of Rotary and served as advisor to Natural
Gas' Board of Directors  from June 2002 to June 2003.  Since 1981, Mr. Yadon has
owned and operated Yadeco Pipe & Equipment and since December 1994, has co-owned
and presided as President of Midland Pipe & Equipment,  Inc. Both  companies are
directly  related to drilling and completion of oil and gas wells in Texas,  New
Mexico, Louisiana and Oklahoma. Since 1981, he has owned Yadon Properties, which
owns and  operates  real estate in  Midland,  Texas.  Mr.  Yadon has 22 years of
experience in the energy service industry.

         S. Craig Rogers age 41, has been our Vice President since June 2003. He
has served as  Operations  Mangers for Rotary  since 1995 and Vice  President of
Rotary from April 2002. From March 1987 to January 1995, Mr. Rogers was the Shop
Manager for CSI, a major manufacture of natural gas compressors.

         Earl R. Wait has served as our Chief  Financial  Officer since May 2000
and our Treasurer  since 1998.  Mr. Wait was our Chief  Accounting  Officer from
1998  to  May  2000.  Mr.  Wait  has  been  the  Chief  Financial   Officer  and
Secretary/Treasurer  of  Flare  King and  then  Rotary  since  April  1993,  the
Assistant  Secretary/Treasurer  for Hi-Tech since June 1996,  the Controller and
Assistant  Secretary/Treasurer  for Hi-Tech from 1994 to 1999, a director of NGE
since July 1999 and the Chief  Accounting  Officer and  Treasurer of Great Lakes
Compression  since February 2001. Mr. Wait is a certified public accountant with
an MBA in  management  and has more than 25 years of  experience  in the  energy
industry.

         Scott W. Sparkman has served as Executive  Vice-President  of NGE since
July 2001,  has served as a director  since  December  1998 and as Secretary and
Treasurer of NGE since March 1999 and has served as the Secretary of Great Lakes
Compression since February 2001. Mr. Sparkman was one of our directors from 1998
to 2003. Mr.  Sparkman served as the President of NGE from December 1998 to July
2001.  From May 1997 to July 1998, Mr.  Sparkman  served as Project  Manager and
Comptroller for Business  Development  Strategies,  Inc., a designer of internet
websites.  Mr. Sparkman pursued personal business interests from May 1996 to May
1997.  From February 1991 to May 1996, Mr. Sparkman served as Vice President and
Director, later as President and Director, of Diamond S Safety Services, Inc., a
seller and servicer of hydrogen sulfide monitoring equipment. Mr. Sparkman filed



47



for personal  bankruptcy in 1998 as a result of personal debt created when there
was a decline in the need for the  oilfield  services  that were  provided  by a
company that was owned by Mr. Sparkman.  He received a BBA degree from Texas A&M
University.

         The following sets forth biographical information for at least the past
five years for one of our employees whom we consider to be a key employee.

         Ronald D.  Bingham,  age 58, has served as the President of Great Lakes
Compression  since  2001.  From  March 2001 to July 2001,  Mr.  Bingham  was the
General Manager of Great Lakes Compression. From January 1989 to March 2001, Mr.
Bingham was the  District  Manager  for  Waukesha  Pearce  Industries,  Inc.,  a
distributor  of Waukesha  natural gas  engines.  Mr.  Bingham is a member of the
Michigan Oil and Gas Association and received a bachelors degree in Graphic Arts
from Sam Houston State University.

         All of the officers and key employees devote substantially all of their
working time to our business.


























48





Executive Compensation

         The following table sets forth  information  regarding the compensation
paid during the years ended  December 31, 2002,  2001 and 2000 by us to Wayne L.
Vinson and Earl R. Wait,  our only executive  officers  during those years whose
combined salary and bonuses exceeded $100,000 during the year ended December 31,
2002.

                                                                         Long Term
                                     Annual Compensation             Compensation Awards
                                     -------------------             -------------------
Name and                                                            Securities Underlying
Principal Position             Year      Salary           Bonus           Options
------------------             ----      ------           -----           -------
                                                                  
Wayne L. Vinson                2002    $ 120,000(1)      $ 39,452            -0- (2)
     President and Chief
     Executive Officer         2001    $ 102,692(1)      $ 25,583            -0-
                               2000       74,423(1)        25,604            -0-

Earl R. Wait                   2002    $  90,000         $ 29,589         15,000
     Chief Financial Officer   2001       85,385           23,164            -0-
                               2000       80,088            7,416            -0-

--------------------------

(1)      Does not include any  compensation  paid to the wife of Wayne L. Vinson
         for her  services as our accounts  payable and payroll  clerk for 2002,
         2001 and 2000, respectively.

(2)      CAV-RDV,  Ltd.,  a Texas  limited  partnership  for the  benefit of the
         children of Wayne L. Vinson, was issued a five year warrant to purchase
         15,756  shares of our common stock at $2.50 per share in  consideration
         for CAV-RDV,  Ltd. guaranteeing a portion of our debt. The children are
         eighteen years old or older and Mr. Vinson is not a partner in CAV-RDV,
         Ltd. and disclaims beneficial ownership of the warrants.

         We have  established a bonus  program for our  officers.  At the end of
each of our fiscal years, our Board of Directors  reviews our operating  history
and determines whether or not any bonuses should be paid to our officers. If so,
the Board of Directors determines what amount should be allocated.  The Board of
Directors may discontinue the bonus program at any time.

























49




                        Option Grants in Last Fiscal Year

         The following table sets forth information  pertaining to option grants
to Wayne L. Vinson and Earl R. Wait, our only executive officers during the year
ended December 31, 2002,  whose combined  salary and bonuses  exceeded  $100,000
during that year:


                                % of Total
                  Number of       Options
                 Securities     Granted to
                 Underlying    Employees in
Name               Options      Fiscal Year    Exercise Price    Expiration Date
----               -------      -----------    --------------    ---------------
Wayne L. Vinson       0             0%              N/A                N/A
Earl R. Wait       15,000           35%            $3.25            4/23/2012


Aggregate Option Exercises in Last Fiscal Year and Fiscal Year End Option Values

         The  following  table  sets  forth  information  pertaining  to  option
exercises  to Wayne L.  Vinson and Earl R.  Wait,  our only  executive  officers
during the year ended  December  31,  2002,  whose  combined  salary and bonuses
exceeded $100,000 during that year:




























50





                                                              Fiscal Year End Option Values
                                                              -----------------------------

                                                    Number of Securities         Value of Unexercised
                        Shares                    Underlying Unexercised        In-the-Money Options
                       Acquired       Value     Options at Fiscal Year End       at Fiscal Year End
Name                 on Exercise    Realized     Exercisable/Unexercisable    Exercisable/Unexercisable
----                 -----------    --------     -------------------------    -------------------------
                                                                  
Wayne L. Vinson           0            0                    0/0                          0/0
Earl R. Wait              0            0                  0/15,000                     0/$9,750



Compensation of Directors

         Our  directors who are not employees are paid $1,000 per quarter and at
December  31 of each year will be issued a five year  option to  purchase  2,500
shares of our common  stock at the then  market  value.  We also  reimburse  our
directors for accountable expenses incurred on our behalf.

1998 Stock Option Plan

         We have  adopted  the 1998 Stock  Option  Plan which  provides  for the
issuance of options to purchase up to 150,000  shares of our common  stock.  The
purpose of the plan is to attract and retain the best  available  personnel  for
positions of substantial  responsibility and to provide additional  incentive to
employees and consultants  and to promote the success of our business.  The plan
is administered by the Board of Directors or a compensation committee consisting
of two or more  non-employee  directors,  if appointed.  At its discretion,  the
administrator  of the plan may  determine  the  persons to whom  options  may be
granted and the terms upon which such options will be granted. In addition,  the
administrator  of the plan may  interpret  the plan  and may  adopt,  amend  and
rescind rules and regulations for its administration. Options to purchase 12,000
shares of our common stock at an exercise  price of $2.00 per share,  options to
purchase  33,000  shares of our common  stock at an exercise  price of $3.25 per
share,  and options to purchase  7,500 shares of our common stock at an exercise
price of $3.88 per share have been granted under the plan and are outstanding.

Limitations on Directors' and Officers' Liability

         Our Articles of  Incorporation  provide our officers and directors with
certain  limitations on liability to us or any of our  shareholders  for damages
for breach of fiduciary duty as a director or officer  involving certain acts or
omissions of any such director or officer.

         This  limitation  on  liability  may have the  effect of  reducing  the
likelihood  of  derivative  litigation  against  directors  and officers and may
discourage or deter  shareholders  or management from bringing a lawsuit against
directors  and  officers  for breach of their duty of care even  though  such an
action, if successful, might otherwise have benefited us and our shareholders.




51



         Our   Articles   of   Incorporation    and   bylaws   provide   certain
indemnification  privileges  to our  directors,  employees,  agents and officers
against  liabilities  incurred  in  legal  proceedings.   Also,  our  directors,
employees, agents or officers who are successful, on the merits or otherwise, in
defense  of any  proceeding  to  which he or she was a party,  are  entitled  to
receive indemnification against expenses, including attorneys' fees, incurred in
connection with the proceeding.

         Insofar as indemnification for liabilities arising under the Securities
Act may be permitted to our directors, officers and controlling persons pursuant
to the  foregoing  provisions,  or  otherwise,  we have been advised that in the
opinion of the  Securities  and  Exchange  Commission  such  indemnification  is
against  public  policy as expressed in the  Securities  Act and is,  therefore,
unenforceable.

         We are not aware of any pending litigation or proceeding involving any
of our directors, officers, employees or agents as to which indemnification is
being or may be sought, and we are not aware of any other pending or threatened
litigation that may result in claims for indemnification by any of our
directors, officers, employees or agents.

Section 16(a) Beneficial Ownership Reporting Compliance

         Section  16(a) of the  Securities  Exchange  Act of 1934  requires  our
officers and  directors  and persons who  beneficially  own more than 10% of our
outstanding  common  stock to file  reports  of  beneficial  ownership  with the
Securities and Exchange Commission and to furnish us with copies of the reports.

         Based solely on a review of the Forms 3, 4 and 5 and amendments thereto
furnished to us from October 21, 2002,  until  December 31, 2002, no persons who
were either one of our directors or officers or who beneficially owned more than
10% of our common  stock failed to file on a timely  basis  reports  required by
Section  16(a) of the  Securities  Exchange  Act of 1934 except that  Charles G.
Curtis  filed  an  amendment  to his  Form 3 to add  10%  Convertible  Series  A
Preferred Stock he owned, filed an amendment to a Form 4 to include common stock
and warrants that were not  previously  reported and was late in filing a Form 4
to report  the  granting  of an  option to him;  Diamond S DGT Trust was late in
filing its Form 3; James T.  Grigsby  filed an amendment to his Form 4 to report
warrants that were  previously not included on his Form 4 and was late in filing
a Form 4 to  report  the  granting  of an  option to him;  Alan P.  Kurus  filed
amendments  to his Form 3 to change the nature of his  ownership of common stock
and to report a stock  option  that he  owned;  Sharon  Renee  Pipes was late in
filing her Form 3;  Wallace O. Sellers was late in filing a Form 4 to report the
granting of an option to him;  and Earl R. Wait filed an amendment to his Form 3
to report a stock option that he owned.








52



         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT


         The  following  table  sets  forth,  as  of  September  22,  2003,  the
beneficial  ownership  of our common  stock:  (i) by each of our  directors  and
executive  officers;  (ii) by all of our  executive  officers and directors as a
group;  and (iii) by all persons known by us to beneficially  own more than five
percent of our common stock.

                                                                      Percent
                                       Shares of Common Stock       Beneficially
Name and Address                         Beneficially Owned             Owned
----------------                         ------------------         ------------
Wallace O. and Naudain Sellers               698,159(1)                 13.8%
P.O. Box 106, 6539 Upper York Road
Solebury, PA  18963-0106

Wayne L. Vinson                                 0(2)                     0.0%
4404 Lennox Drive
Midland, TX  79707

Charles G. Curtis                             65,500(3)                  1.3%
1 Penrose Lane
Colorado Springs, CO  80906

James T. Grigsby                             81,700(4)                   1.6%
3345 Grimsby Lane
Lincoln, NE  68502

Wallace C. Sparkman                          167,691(5)                  3.3%
4906 Oakwood Court
Midland, TX 79707





























53



Gene A. Strasheim                                0                       0.0%
165 Huntington Place
Colorado Springs, CO  80906

Richard L. Yadon                             294,183(6)                  5.8%
P.O. Box 8715
Midland, TX  79708-8715

S. Craig Rogers                              14,250(7)                    .3%
14732 Bluestem Ave
Gardendale, TX  79758

Earl R. Wait                                  75,000(8)                  1.5%
109 Seco
Portland, TX  78374

Scott W. Sparkman                            516,467(9)                 10.2%
1604 Ventura Avenue
Midland, TX  79705

All directors and executive
officers as a group                       1,912,950(10)                 36.8%
(nine persons)

CAV-RDV, Ltd.                                488,128(2)                  9.7%
1541 Shannon Drive
Lewisville, TX  75077

RWG Investments LLC                         424,000(11)                  8.2%
5980 Wildwood Drive
Rapid City, SD  57902

-----------------------------------
(1)      Includes  238,720 shares of common stock owned by the Wallace  Sellers,
         July 11, 2002 GRAT, warrants to purchase 21,936 shares of common stock,
         9,032 shares of common stock and 5,000 shares of common stock at $ 2.50
         per  share,  at $3.25 per share and at $6.25 per  share,  respectively,
         owned by Wallace Sellers,  an option to purchase 2,500 shares of common
         stock at $3.88 per share  owned by Wallace  Sellers,  95,971  shares of
         common  stock owned by Naudain  Sellers,  and 238,720  shares of common
         stock owned by the  Naudain  Sellers,  July 11, 2002 GRAT.  Wallace and
         Naudain Sellers are husband and wife. Wallace Sellers is the trustee of
         his  wife's  trust  and  his  wife is the  trustee  of his  trust.  The
         beneficiaries  of the trusts are two trusts.  The  beneficiaries of one
         trust  are  Naudain   Sellers  and  their   three   children   and  the
         beneficiaries of the other trust are their three children.
(2)      CAV-RDV,  Ltd.,  a Texas  limited  partnership  for the  benefit of the
         children of Wayne L. Vinson,  owns  470,250  shares of common stock and
         warrants to purchase  15,756  shares of common stock at $2.50 per share
         and 2,122 shares of common stock at $3.25 per share, respectively. Both
         children  are 18 years old or older and Mr.  Vinson is not a partner in
         CAV-RDV,  Ltd. Mr. Vinson disclaims  beneficial ownership of any of the
         shares of common stock.
(3)      Represents  warrants to purchase 40,000 shares of common stock at $3.25
         per share,  an option to purchase 2,500 shares of common stock at $3.88
         per share and 18,000  shares of common stock which may be obtained upon
         conversion of shares of our 10% Convertible Series A Preferred Stock.
(4)      Includes  warrants to purchase  9,600  shares at $6.25 per share and an
         option to purchase 2,500 shares at $3.88 per share.
(5)      Includes  105,691  shares owned by Diamente  Investments,  LLP, a Texas
         limited  partnership  of which Mr.  Sparkman  is a general  and limited
         partner.
(6)      Includes  warrants to purchase  14,683  shares of common stock at $2.50
         per share.
(7)      Includes warrants to purchase 1,125 shares of common stock at $6.25 per
         share and an option to purchase  12,000 shares of common stock at $3.25
         per share that began to vest in April 2003.
(8)      Includes an option to purchase  15,000  shares of common stock at $3.25
         per share that began to vest in April 2003.




54



(9)      Includes  20,000  shares of common stock owned by Scott W. Sparkman and
         475,000  shares of common stock and warrants to purchase  21,467 shares
         of common  stock at $2.50 per share owned by Diamond S DGT, a trust for
         which Mr. Sparkman is a co-trustee and co-beneficiary with his sister.

(10)     Includes  the shares of common stock set forth in (1) through (9) above
         issuable  upon the exercise of options and warrants and the  conversion
         of shares of our 10% Convertible Series A Preferred Stock.

(11)     Includes  warrants to purchase  32,000  shares of common stock at $3.25
         per share,  warrants to purchase 15,000 shares of common stock at $6.25
         per share and 12,000  shares of common stock which may be obtained upon
         conversion of shares of our 10% Convertible  Series A Preferred  Stock.
         RWG Investments LLC is a limited liability company the beneficial owner
         of which is Roland W. Gentner,  5980 Wildwood Drive,  Rapid City, South
         Dakota 57902.






























55



                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

         In March 2001,  we issued  warrants  that will  expire on December  31,
2006, to purchase shares of our common stock at $2.50 per share to the following
persons for guaranteeing the amount of our debt indicated:

                                     Number of Shares               Amount of
     Name                           Underlying Warrants          Debt Guaranteed
     ----                           -------------------          ---------------

     Wallace O. Sellers                   21,936                   $ 548,399
     Wallace C. Sparkman(1)               21,467                     536,671
     CAV-RDV, Ltd.(2)                     15,756                     393,902
     Richard L. Yadon                      9,365                     234,121
---------------------------
(1)      Wallace C. Sparkman  subsequently  transferred  his warrants for 21,467
         shares to  Diamond S DGT,  a trust of which  Scott W.  Sparkman  is the
         trustee and a  beneficiary.  Wallace C. Sparkman has  represented to us
         that he has no beneficial interest in Diamond S DGT.

(2)      CAV-RDV,  Ltd., is a Texas limited  partnership  for the benefit of the
         children of Wayne L. Vinson.  Both  children are eighteen  years old or
         older and Mr.  Vinson is not a partner  in  CAV-RDV,  Ltd.  Mr.  Vinson
         disclaims beneficial ownership of the warrants.

         None of the guaranties is still in effect.

         In April 2002, we issued five year  warrants to purchase  shares of our
common stock at $3.25 per share to the following  persons for  guaranteeing  our
restructured bank debt indicated:

                                     Number of Shares       Amount of Additional
     Name                           Underlying Warrants        Debt Guaranteed
     ----                           -------------------        ---------------

     Wallace O. Sellers                    9,032                 $  451,601
     CAV-RDV, Ltd.(1)                      2,122                    106,098
     Richard L. Yadon                      5,318                    265,879
---------------------------

(1)      CAV-RDV,  Ltd., is a Texas limited  partnership  for the benefit of the
         children of Wayne L. Vinson.  Both  children are eighteen  years old or
         older and Mr.  Vinson is not a partner  in  CAV-RDV,  Ltd.  Mr.  Vinson
         disclaims beneficial ownership of the warrants.

         None of the guaranties is still in effect.

         Wayne L.  Vinson,  Earl R.  Wait and  Wallace  C.  Sparkman  have  also
guaranteed  approximately  $197,000,  $84,000  and  $92,000,   respectively,  of
additional  debt for us without  consideration.  This debt was incurred  when we
acquired  vehicles,  equipment and software.  The  following  schedule  provides
information as to the remaining debt balances as of June 30, 2003:







56



                                 Balance at             Interest        Maturity
         Guarantor              June 30, 2003               Rate            Date
         ---------              -------------          ---------     -----------
         Earl Wait                     $10,000             1.90%       3/26/2004
         Earl Wait                      35,525            10.50%      10/10/2005
         Wallace Sparkman               76,492               10%      10/15/2010
         Wayne Vinson                      443      Prime + 1.0%       7/15/2003
         Wayne Vinson                    8,928             1.90%       4/22/2004
         Wayne Vinson                    6,436             7.50%       6/21/2004

         None of the guarantees is still in effect.


         In October,  1999, RWG Investments,  LLC was granted a five year option
to  purchase  100,000  shares  of  our  common  stock  at  $2.00  per  share  in
consideration  of one of its members  serving as an advisor to us. In June 2003,
RWG Investments LLC exercised the option.

         Hunter Wise  Financial  Group LLC served as our  investment  banker and
advisor in connection with our acquisition of the compression  related assets of
Dominion  Michigan for which we paid Hunter Wise a total fee of $440,000.  James
T. Grigsby, one of our directors, has a 1% interest in Hunter Wise.

         Charles G.  Curtis,  one of our  directors,  Alan P. Kurus,  one of our
former officers, and RWG Investments, LLC, a beneficial owner of more than 5% of
our  outstanding  stock,  purchased our notes and five year warrants to purchase
common stock in a private  offering that commenced in October 2000 and concluded
in May 2001. Mr. Curtis purchased $100,000 of the notes and warrants,  Mr. Kurus
purchased  approximately  $79,000 of the notes and warrants and RWG Investments,
LLC  purchased  $80,000  of the notes  and  warrants.  The  notes  and  warrants
purchased by Mr.  Curtis,  Mr. Kurus and RWG  Investments,  LLC were on the same
terms  and  conditions  as sales to  non-affiliated  purchasers  in the  private
offering.

         Charles G. Curtis,  one of our directors,  and RWG Investments,  LLC, a
beneficial  owner of more than 5% of our  outstanding  stock,  purchased  18,000
shares and 12,000 shares, respectively, or $58,500 and $39,000, respectively, of
our 10%  Convertible  Series  A  Preferred  Stock  in a  private  offering  that
commenced in July 2001. The shares  purchased by Mr. Curtis and RWG Investments,
LLC were on the same terms and conditions as sales to non-affiliated  purchasers
in the private offering.

         Wallace O. Sellers,  Charles G. Curtis and James T.  Grigsby,  three of
our independent directors,  were each paid $1,000 and were each issued an option
to purchase  2,500  shares of our common stock at $3.88 per share for serving as
our directors during the year ended December 31, 2002.





57





                             SELLING SECURITYHOLDERS

         The following  table sets forth  information  regarding the  beneficial
ownership of our  securities  by the selling  securityholders.  All  information
contained in the table below is based upon  beneficial  ownership as of June 30,
2003.

         The  selling   securityholders   received  their  securities  from  the
underwriter of our initial public offering completed in October 2002. As part of
its  compensation  in the  offering,  the  underwriter  received  an  option  to
purchase:

         o        150,000 shares of our common stock at $6.25 per share; and
         o        warrants to  purchase  150,000  shares of our common  stock at
                  $7.8125 per share.

         We agreed to register the shares of common stock in order to permit the
selling  securityholders  to sell these  shares  from time to time in the public
market or in privately-negotiated  transactions.  We have also agreed to pay for
all expenses of this offering other than underwriting  discounts and commissions
and brokerage commissions and fees.

         This table assumes that all shares owned by the selling securityholders
as being  sold.  The  selling  securityholders  may offer and sell less than the
number of shares  indicated.  The  selling  securityholders  are not  making any
representation that any shares will or will not be offered for sale.

                                                      Shares                                                  Shares
Name and Address                                 Beneficially Owned                  Shares Offered     Beneficially Owned
of Selling Securityholder                      Prior to the Offering                    Hereby          After the Offering
-------------------------           --------------------------------------------     --------------     ------------------
                                                                                      
                                     Underlying Options      Underlying Warrants
                                     ------------------      -------------------
                                     Number     Percent      Number      Percent
                                     ------     -------      ------      -------

Charles C. Bruner                    30,000        20%       30,000         20%            all                  -0-
1675 Larimer Street, Suite 300
Denver, Colorado  80203

Zenas N. Gurley                      15,000        10%       15,000         10%            all                  -0-
102 South Tejon Street, Suite 1100
Colorado Springs, Colorado  80903

Eugene Neidiger                      30,000        20%       30,000         20%            all                  -0-
1675 Larimer Street, Suite 300
Denver, Colorado  80203

Robert L. Parish                     11,000       7.3%       11,000        7.3%            all                  -0-
1675 Larimer Street, Suite 300
Denver, Colorado  80203






58



Anthony B. Petrelli                  40,000      26.7%       40,000       26.7%            all                  -0-
1675 Larimer Street, Suite 300
Denver, Colorado  80203

Regina L. Roesner                    15,000        10%       15,000         10%            all                  -0-
1675 Larimer Street, Suite 300
Denver, Colorado  80203

John R. Turk                          9,000         6%        9,000          6%            all                  -0-
1675 Larimer Street, Suite 300
Denver, Colorado  80203


                              PLAN OF DISTRIBUTION

         This offering is self-underwritten; we have not employed an underwriter
for the issuance of common stock upon the exercise of the warrants and we will
bear all expenses of the offering.

         The warrants may be exercised by the delivery to Computershare Investor
Services,  Inc., 350 Indiana Street,  Suite 800, Golden,  Colorado 80401 of your
warrant  certificate  accompanied  by an election of exercise and payment of the
warrant  exercise  price  for  each  share of your  common  stock  purchased  in
accordance  with the terms of the  warrant.  Payment must be made in the form of
cash or a  cashier's  or  certified  check  payable to the order of Natural  Gas
Services Group, Inc. Delivery of the certificates  representing the common stock
will be made upon receipt of the warrant  certificate duly executed for transfer
together with payment for the exercise  price and our  acceptance of your tender
for exercise.  If you exercise  fewer than all of your  warrants,  a new warrant
certificate evidencing warrants remaining unexercised will be issued to you.

                            DESCRIPTION OF SECURITIES

         The  following  describes  the  attributes  of our  authorized  and our
outstanding securities.

Common Stock

         We are authorized to issue up to 30,000,000 shares of our common stock,
$.01 par  value.  There are  5,022,181  shares of our  common  stock  issued and
outstanding  as of the date of this  prospectus.  All shares of our common stock
have equal voting rights and, when validly issued and outstanding, have one vote
per share in all matters to be voted upon by shareholders.  The shares of common
stock have no preemptive, subscription,  conversion or redemption rights and may
be issued only as fully paid and non-assessable shares. Cumulative voting in the
election of directors is not allowed, which means that the holders of a majority
of the  outstanding  shares  represented  at any  meeting  at which a quorum  is
present will be able to elect all of the  directors if they choose to do so and,
in such event, the holders of the remaining shares will not be able to elect any
directors. On liquidation,  each common shareholder is entitled to receive a pro
rata share of the assets available for distribution to holders of common stock.

         We have no stock  option  plan or similar  plan which may result in the
issuance of stock options,  stock purchase warrants, or stock bonuses other than
our 1998 Stock Option Plan  pursuant to which an aggregate of 150,000  shares of




59



common stock have been reserved for issuance.  Options to purchase 12,000 shares
of common stock with an average  exercise price of $2.00 per share,  and options
to purchase  33,000 shares of our common stock at an exercise price of $3.25 per
share and options to purchase  7,500 shares of common stock at an exercise price
of $3.88 per share have been granted and are outstanding under the plan.

Preferred Stock

         We are  authorized  to  issue  up to a total  of  5,000,000  shares  of
preferred stock,  $.01 par value. The shares of preferred stock may be issued in
one or more series from time to time with such designations, rights, preferences
and limitations as our Board of Directors may determine  without the approval of
our shareholders.  The rights, preferences and limitations of separate series of
preferred  stock may differ with respect to such matters as may be determined by
our Board of Directors,  including  without  limitation,  the rate of dividends,
method  or nature or  prepayment  of  dividends,  terms of  redemption,  amounts
payable on liquidation,  sinking fund provisions,  conversion  rights and voting
rights.  The ability of our Board of  Directors to issue  preferred  stock could
also be used by it as a means  for  resisting  a change in our  control  and can
therefore be considered an "anti-takeover" device. We currently have no plans to
issue any additional shares of preferred stock.

         We  designated  1,177,000,   shares  of  our  preferred  stock  as  10%
Convertible  Series A Preferred Stock. In 2001 and 2002, 381,654 of these shares
were sold in a private offering. 38,000 of these shares have been converted into
38,000 shares of common stock.  At our 2003 Annual Meeting of  Shareholders,  we
reduced the number of designated  shares of Preferred Stock to 381,654 shares of
Preferred  Stock  actually  sold.  The Preferred  Stock has a cumulative  annual
dividend rate of 10% in cash. The annual  dividend rate is payable 30 days after
the end of each quarter  beginning  with the quarter  ended  September 30, 2001,
when and if declared by our Board of  Directors.  Each share of Preferred  Stock
will be  entitled  to one vote per share  with the  holders  of our  outstanding
common stock on any matter voted on at a meeting of our shareholders and to vote
as a class on any matter  required to be voted on by classes under Colorado law.
The Preferred Stock initially is convertible  into common stock on a one for one
basis.  The  Conversion  Price will be  adjusted  if at any time we  complete an
offering of our common stock at a price equivalent to less than 150% of the then
Conversion  Price of the  Preferred  Stock.  The  Conversion  Price will also be
adjusted if any investment is made in us at a price  equivalent to less than the
then Conversion  Price of the Preferred  Stock. The Conversion Price may also be
adjusted for stock splits, stock dividends,  certain reorganizations and certain
reclassifications.  The  Preferred  Stock will  automatically  convert  into our
common stock at any time if our common stock trades for 20  consecutive  trading
days at a price  equivalent to 200% of the then Conversion Price (initially 200%
is $6.50 per share).

         The  Preferred  Stock has a per share  liquidation  preference of $3.25
plus accrued and unpaid dividends over our common stock.




60



Series A 10%  Subordinated  Notes due December 31, 2006 and Outstanding  Options
and Warrants

         At the present  time,  we have  outstanding  $1,539,260 of Series A 10%
Subordinated  Notes due December 31, 2006. NGE, one of our subsidiaries,  is the
primary  obligor  on the notes and we are the  guarantor.  Interest  only on the
notes is payable  annually on December 31. In addition,  in conjunction with the
issuance of the notes,  we issued five year warrants to purchase  615,704 shares
of our  common  stock at $3.25 per  share.  In  addition,  we  issued  five year
warrants to purchase 61,570 shares of our common stock at $3.25 per share to the
selling agent of the Series A 10%  Subordinated  Notes due December 31, 2006. Of
the warrants to purchase  61,570 shares,  there are warrants to purchase  13,471
shares still  outstanding.  In addition to those warrants,  we have  outstanding
options  to  purchase  12,000  shares of our  common  stock at $2.00 per  share,
outstanding  options to purchase  33,000 shares of our common stock at $3.25 per
share, outstanding options to purchase 7,500 shares of our common stock at $3.88
per share, outstanding warrants to purchase 68,524 shares of our common stock at
$2.50 per share and outstanding warrants to purchase 16,472 shares of our common
stock at $3.25 per share.

Warrants

         One warrant  entitles  the holder to  purchase  one share of our common
stock at an exercise  price of $6.25  until 5:00 p.m.  (MST)  October 20,  2006,
subject to our  redemption  rights  described  below.  The warrants  were issued
pursuant to the terms of a warrant agreement between us and Computershare  Trust
Company, Inc.

         The  warrant  exercise  price and the number of shares of common  stock
purchasable upon exercise of the warrants are subject to adjustment in the event
of, among other events, a stock dividend on, or a subdivision,  recapitalization
or  reorganization  of, the common stock, or if we merge or consolidate  with or
into another corporation or business entity.

         We may, in our discretion redeem outstanding warrants, in whole but not
in part,  upon not less than 30 days'  notice,  at a price of $0.25 per warrant,
provided  that the  closing  bid price of our  common  stock  equals or  exceeds
$10.9375 (175% of the warrant  exercise price) for 20 consecutive  trading days.
The  redemption  notice must be provided not more than five  business days after
conclusion of the 20 consecutive  trading days in which the closing bid price of
our common stock equals or exceeds  $10.9375 per share. In the event we exercise
our right to redeem the  warrants,  the warrants will be  exercisable  until the
close of  business  on the date  fixed for  redemption  in such  notice.  If any
warrant called for redemption is not exercised by such time, it will cease to be
exercisable  and the holder will be  entitled  only to the  redemption  price of
$0.05 per warrant.

         We  must  have  on  file a  current  registration  statement  with  the
Securities and Exchange Commission pertaining to the common stock underlying the
warrants  in order for a holder to exercise  the  warrants or in order for us to
redeem the warrants. This prospectus is part of a current registration statement
we have filed with the Commission.




61



Underwriter's Options

         In connection with our October 2002 initial public offering,  we issued
options  to  our   underwriter  who  then   transferred   them  to  the  selling
securityholders.  The  options  give the  selling  securityholders  the right to
acquire:

         o        150,000  shares of our common stock for $6.25 per share at any
                  time prior to October 20, 2006.

         o        150,000 warrants to acquire 150,000 shares of our common stock
                  for $7.8125  per share at any time prior to October 20,  2006.
                  These  are  substantially   similar  to  the  public  warrants
                  described  above,   except  that  they  provide  for  cashless
                  exercise,  they cannot be  redeemed  by us and their  exercise
                  price is $7.8125 per share.

         We may grant options in the future in connection with capital formation
activities.

Listing

         Our common stock and  warrants  trade on the  American  Stock  Exchange
under  the  symbols  NGS  and  NGS.WS.  There  is  no  market  for  the  selling
securityholders' options or warrants and none is expected to develop.

Transfer Agent, Warrant Agent and Registrar

         Our transfer  agent,  warrant  agent and registrar for our common stock
and warrants is  Computershare  Trust Company,  Inc., 350 Indiana Street,  Suite
800, Golden, Colorado 80401.


























62



                                     EXPERTS

         Our   consolidated   balance  sheet  at  December  31,  2002,  and  the
consolidated statements of income,  shareholders' equity and cash flows for each
of the two years ended  December 31, 2002 and 2001  included in this  prospectus
have been  included  herein in reliance on the report of HEIN + ASSOCIATES  LLP,
independent certified public accountants, given on the authority of that firm as
experts in  accounting  and  auditing.  With  respect to the  unaudited  interim
consolidated  financial  information  for the six months ended June 30, 2003 and
2002 included  herein,  the independent  certified  public  accountants have not
audited  such  consolidated  financial  information  and have not  expressed  an
opinion  or any  other  form of  assurance  with  respect  to such  consolidated
financial information.































63



                        Natural Gas Services Group, Inc.
                           Consolidated Balance Sheet
                                   (unaudited)
                                  June 30, 2003

         ASSETS

Current Assets:
   Cash and cash equivalents                                         $   976,004
   Accounts receivable - trade                                         1,482,762
   Inventory                                                           2,292,196
   Prepaid expenses                                                       81,156
                                                                     -----------
   Total current assets                                                4,832,118

Lease equipment, net                                                  16,709,633
Other property, plant and equipment, net                               2,616,661
Goodwill, net                                                          2,589,655
Patents, net                                                             127,684
Other assets                                                             114,605
                                                                     -----------
         Total assets                                                $26,990,356
                                                                     ===========

         LIABILITIES AND SHAREHOLDERS' EQUITY

Current Liabilities:
   Current portion of long term debt and capital lease               $ 2,278,951
   Accounts payable and accrued liabilities                              973,025
   Unearned Income                                                       588,007
                                                                     -----------
         Total current liabilities                                     3,839,983

Long term debt and capital lease, less current portion                 6,708,947
Subordinated notes, net                                                1,376,865
Deferred income tax payable                                            1,492,573
                                                                     -----------
              Total liabilities                                       13,418,368
         SHAREHOLDERS' EQUITY
Preferred stock                                                            3,577
Common stock                                                              49,816
Paid in capital                                                       11,167,733
Retained earnings                                                      2,350,862
                                                                     -----------
         Total shareholders' equity                                   13,571,988
                                                                     -----------
         Total liabilities and shareholders' equity                  $26,990,356
                                                                     ===========







The accompanying notes are an integral part of the consolidated balance sheet.


F-1



                        Natural Gas Services Group, Inc.
                         Consolidated Income Statements
                                   (unaudited)
                            Six months ended June 30
                                                         2003           2002
                                                     -----------    -----------
Revenue:
   Sales                                             $ 1,505,110    $ 2,311,269
   Service and maintenance                               893,883        752,020
   Leasing income                                      3,165,567      2,056,267
                                                     -----------    -----------
                                                       5,564,560      5,119,556
Cost of revenue:
   Cost of sales                                       1,146,797      1,561,452
   Cost of service and maintenance                       671,229        658,049
   Cost of leasing                                       767,784        586,299
                                                     -----------    -----------
                                                       2,585,810      2,805,800
                                                     -----------    -----------
         Gross Margin                                  2,978,750      2,313,756
Operating Cost:
   Selling expense                                       324,551        243,670
   General and administrative expense                    791,004        600,487
   Amortization and depreciation                         779,555        537,600
                                                     -----------    -----------
                                                       1,895,110      1,381,757
                                                     -----------    -----------
         Operating income                              1,083,640        931,999

   Interest expense                                     (329,789)      (522,840)
   Equity in earnings of joint venture                      --          207,603
   Other income                                              787          1,910
                                                     -----------    -----------
         Income before income taxes                      754,638        618,672
   Income tax expense                                    321,603        279,563
                                                     -----------    -----------
         Net income                                      433,035        339,109
   Preferred dividends                                    62,020         75,614
                                                     -----------    -----------
Net income available to common shareholders
                                                     $   371,015    $   263,495
                                                     ===========    ===========
         Earnings per share:
         Basic                                       $      0.08    $      0.08
         Diluted                                     $      0.07    $      0.06
         Weighted average shares:
         Basic                                         4,866,527      3,357,632
         Diluted                                       5,116,332      4,163,710





         The accompanying notes are an integral part of the consolidated  income
statements.


F-2





                                                                                Six Months       Six Months
                                                                                  Ended            Ended
                                                                              June 30, 2003    June 30, 2002
                                                                              -------------    -------------
                                                                                         
CASH FLOWS FROM OPERATING ACTIVITIES:
   Net Income                                                                 $     433,035    $     339,109
      Adjustments to reconcile net income to net cash used in
      operating activities:
      Depreciation and amortization                                                 779,555          537,600
      Deferred taxes                                                                321,573          279,563
      Amortization of debt issuance costs                                            32,478           32,477
      Warrants Issued for debt guarantee                                               --             42,025
      Equity in earnings of joint venture                                              --           (207,603)
      Gain on disposal of assets                                                     10,547             --
      Changes in operating assets and liabilities:
      Trade and other receivables                                                  (836,812)        (174,984)
      Inventory and work in progress                                               (746,248)        (247,991)
      Prepaid expenses and other                                                     92,146          (23,513)
      Accounts payable and accrued liabilities                                      270,867          276,419
      Unearned income                                                               270,446          449,065
      Other                                                                         (91,341)         (23,760)
                                                                              -------------    -------------
           NET CASH PROVIDED BY OPERATING ACTIVITIES                                536,246        1,278,407

CASH FLOWS FROM INVESTING ACTIVITIES:
   Purchase of property and equipment                                            (4,465,223)      (2,296,033)
   Acquisition of remaining interest in joint venture, net of cash acquired         242,753             --
   Proceeds from sale of property and equipment                                     112,500             --
   Decrease in lease receivable                                                     210,512           40,954
   Distribution from equity method investee                                          49,090          123,353
                                                                              -------------    -------------
           NET CASH USED IN INVESTING ACTIVITIES                                 (3,850,368)      (2,131,726)

CASH FLOWS FROM FINANCING ACTIVITIES:
   Net proceeds from bank loans and line of credit                                2,438,997        1,353,386
   Repayments of long term debt                                                  (1,000,489)        (449,123)
   Deferred offering costs                                                             --           (152,326)
   Proceeds from stock offering, net of offering cost                                  --             12,724
   Dividends paid on preferred stock                                                (62,020)         (75,614)
   Proceeds from exercise of warrants                                               200,000             --
                                                                              -------------    -------------
         NET CASH PROVIDED BY FINANCING ACTIVITIES                                1,576,488          689,047
                                                                              -------------    -------------
NET CHANGE IN CASH AND CASH EQUVALENTS                                           (1,737,634)        (164,272)
CASH AT BEGINNING OF PERIOD                                                       2,713,638          506,669
                                                                              -------------    -------------
CASH AT END OF PERIOD                                                         $     976,004    $     342,397
                                                                              =============    =============

SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
      Interest paid                                                           $     329,789    $     470,697
      Income taxes paid                                                       $        --      $        --



         The  accompanying  notes  are an  integral  part  of  the  consolidated
statements of cash flows.



F-3



                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(1) Basis of Presentation


         The   accompanying   unaudited   financial   statements   present   the
consolidated results of our company and its wholly-owned subsidiaries taken from
our  books  and  records.  In  our  opinion,   such  information   includes  all
adjustments,   consisting  of  only  normal  recurring  adjustments,  which  are
necessary to make our financial position at June 30, 2003 and the results of our
operations  for the six  months  periods  ended  June  30,  2003  and  2002  not
misleading.  As permitted by the rules and  regulations  of the  Securities  and
Exchange Commission (SEC) the accompanying  financial  statements do not include
all disclosures normally required by accounting principles generally accepted in
the United  States of  America.  These  financial  statements  should be read in
conjunction with the financial  statements included in our Annual Report on Form
10-KSB on file with the SEC.  Investments in joint ventures in which our company
does not have majority  voting  control are accounted for by the equity  method.
All   intercompany   balances  and   transactions   have  been   eliminated   in
consolidation. In our opinion , the consolidated financial statements are a fair
presentation of the financial position, results of operations and cash flows for
the periods presented.

         The results of  operations  for the six months  ended June 30, 2003 are
not  necessarily  indicative of the results of operations to be expected for the
full fiscal year ending December 31, 2003

(2) Stock-based Compensation

         Statement  of  Financial  Accounting  Standards  No. 123,  ("SFAS 123")
"Accounting for Stock-Based Compensation," encourages, but does not require, the
adoption of a fair  value-based  method of accounting  for employee  stock-based
compensation transactions. We have elected to apply the provisions of Accounting
Principles Board Opinion No. 25 ("Opinion 25"),  "Accounting for Stock Issued to
Employees,"  and  related  interpretations,   in  accounting  for  our  employee
stock-based  compensation plans. Under Opinion 25, compensation cost is measured
as the excess,  if any, of the quoted  market  price of our stock at the date of
the grant above the amount an employee must pay to acquire the stock.

         Had  compensation  costs for  options  granted  to our  employees  been
determined based on the fair value at the grant dates consistent with the method
prescribed  by SFAS No.  123,  our pro forma net income and  earnings  per share
would have been reduced to the pro forma amounts listed below:

                                Six Months Ended
                                     June 30
                                                        2003           2002
                                                    -----------    -----------
Pro forma impact of fair value method
Income applicable to common shares, as
  reported                                          $   371,015    $   263,495
Pro-forma stock-based compensation costs
  under the fair value method, net of related tax       (15,365)       (14,010)
                                                    -----------    -----------
Pro-forma income applicable to common shares        $   355,650    $   249,485
  under the fair-value method




F-4



Earnings per common share

Basic earnings per share reported                   $      0.08    $      0.08
Diluted earnings per share reported                 $      0.07    $      0.06
Pro-forma basic earnings per share under the
  fair Value method                                 $      0.07    $      0.07
Pro-forma diluted earnings per share under the
  fair value method                                 $      0.07    $      0.06
Weighted average Black-Scholes fair value
   assumptions:
 Risk free rate                                        4.0%-5.2%
 Expected life                                         5-10 yrs
 Expected volatility                                     50.0 %
 Expected dividend yield                                  0.0%

(3) Acquisitions

         On March 31, 2003 we acquired 28 gas  compressor  packages  from Hy-Bon
Engineering Company,  Inc.  ("Hy-Bon").  The adjusted purchase price amounted to
approximately  $2,140,000.  As part of the purchase and sale  agreement,  Hy-Bon
withdrew as a member of Hy-Bon  Rotary  Compression,  L.L.C.  ("Joint  Venture")
effective  as of  January  1,  2003.  We, as the other  member of Hy-Bon  Rotary
Compression,  L.L.C.,  retained all assets of Hy-Bon Rotary Compression,  L.L.C.
that as of December 31, 2002 had an unaudited  aggregate  value of $346,511.  We
plan to  dissolve  Hy-Bon  Rotary  Compression,  L.L.C.  and have  agreed not to
operate under the name Hy-Bon.  We have consolidated the operations of the Joint
Venture  beginning  January  1, 2003 and then began  recording  our share of the
profit of the acquired interest beginning April 1, 2003.

(4) Long Term Debt

         We entered  into a new loan  agreement  with our bank,  as of March 26,
2003 that  included new  borrowing of $2,150,000 in the form of a term loan with
monthly  principal  payments of $35,833  with  interest at 1% over prime but not
less than 5.25% for 60 months. The proceeds from this new borrowing were used to
purchase the 28 gas compressors from Hy-Bon  Engineering  Company,  Inc. The new
loan agreement also included the renewal of our line of credit for $750,000 with
interest at 1% over prime but not less than 5.25% for one year.



























F-5





(5) Segment Information

         FAS No. 131,  Disclosures  about  Segments of an Enterprise and Related
Information,   establishes  standards  for  public  companies  relating  to  the
reporting of information about their operating segments in financial statements.
Operating  segments  are  components  of  an  enterprise  about  which  separate
financial  information  is  available  that  is  evaluated  regularly  by  chief
operating decision-makers in deciding how to allocate resources and in assessing
performance.

         Our segment information is set forth in the following table:

                                                                       Natural Gas
         (in thousands)       Rotary           NGE       Great Lakes     Services
                                Gas          Leasing     Compression      Group         Total
        Six Months Ended    -----------    -----------   -----------   -----------    -----------
          June 30, 2003
                                                                       
Revenue                     $     1,200    $     2,070   $     2,295   $      --      $     5,565
Inter-segment revenue             2,744             35             8          --            2,787
Net Income (loss)                   (54)           874           394          (781)           433
Segment Assets                    4,323         12,986         9,195           486         26,990

                                                                       Natural Gas
         (in thousands)       Rotary           NGE       Great Lakes     Services
                                Gas          Leasing     Compression      Group         Total
        Six Months Ended    -----------    -----------   -----------   -----------    -----------
          June 30, 2002
Revenue                     $     1,571    $     1,059   $     2,490   $      --      $     5,120
Inter-segment revenue             3,046           --            --            --            3,046
Net Income  (loss)                  196            515           188          (560)           339
Segment Assets                    4,504          6,711         9,160           695         21,070

























F-6



(6) Earnings per common share

The following table  reconciles the numerators and denominators of the basic and
diluted earnings per share computation.

                                                           Six Months Ended
                                                              June 30,
                                                         2003           2002
                                                     --------------------------
Basic earnings per share Numerator:
Net income                                           $   433,035    $   339,109
Less: dividends on preferred shares                      (62,020)       (75,614)
                                                     --------------------------
Net income available to common shareholders          $   371,015    $   263,495
                                                     ==========================

Denominator -
Weighted average common shares outstanding             4,866,527      3,357,632
                                                     ==========================

Basic earnings per share                             $      0.08    $      0.08
                                                     ==========================

Diluted earnings per share Numerator:
Net income                                           $   433,035    $   339,109
Less: dividends on preferred shares (1)                  (62,020)       (75,614)
                                                     --------------------------
Net income available to common shareholders          $   371,015    $   263,495
                                                     ==========================

Denominator :
Weighted average common shares outstanding             4,866,527      3,357,632
Common stock options and warrants                        249,805        806,078
Conversion of preferred shares (1)                          --             --
                                                     --------------------------
                                                       5,116,332      4,163,710
                                                     ==========================

Diluted earnings per share                           $      0.07    $      0.06
                                                     ==========================

(1)      Preferred shares were  anti-dilutive  for the six months ended June 30,
         2003 and 2002.















F-7



                          INDEPENDENT AUDITOR'S REPORT




The Board of Directors
Natural Gas Services Group, Inc.


We have  audited  the  accompanying  consolidated  balance  sheet of Natural Gas
Services Group,  Inc. and Subsidiaries  (the "Company") as of December 31, 2002,
and the related consolidated statements of income, stockholders' equity and cash
flows for the years ended December 31, 2002 and 2001. These financial statements
are the  responsibility of the Company's  management.  Our  responsibility is to
express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the  United  States of  America.  Those  standards  require  that we plan and
perform the audits to obtain  reasonable  assurance  about whether the financial
statements are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  An audit also includes assessing the accounting principles used and
significant  estimates  made by  management  as well as  evaluating  the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for our opinion.

In our opinion, the consolidated  financial statements referred to above present
fairly, in all material  respects,  the financial  position of the Company as of
December 31, 2002,  and the results of its operations and its cash flows for the
years ended December 31, 2002 and 2001 in conformity with accounting  principles
generally accepted in the United States of America.




HEIN + ASSOCIATES LLP

Dallas, Texas
February 21, 2003

















F-8





                NATURAL GAS SERVICES GROUP, INC. AND SUBSIDIARIES

                           CONSOLIDATED BALANCE SHEET


                                DECEMBER 31, 2002

                                     ASSETS
                                     ------

                                                                                           
CURRENT ASSETS:
   Cash and cash equivalents                                                                  $ 2,713,638
   Trade accounts receivable, no allowance for doubtful accounts considered necessary             709,122
   Lease receivable, net of unearned interest of $23,723                                           97,813
   Inventory                                                                                    1,475,794
   Prepaid expenses and other                                                                      87,643
                                                                                              -----------
                  Total current assets                                                          5,084,010

PROPERTY AND EQUIPMENT, net of accumulated depreciation of $2,209,512                          15,694,946
GOODWILL, net of accumulated amortization of $325,192                                           2,589,654
PATENTS, net of accumulated amortization of $109,939                                              141,426
LEASE RECEIVABLE, net of unearned interest of $8,837                                              112,699
INVESTMENT IN JOINT VENTURE                                                                       198,313
OTHER ASSETS                                                                                      116,039
                                                                                              -----------
                  Total assets                                                                $23,937,087
                                                                                              ===========

                      LIABILITIES AND STOCKHOLDERS' EQUITY
                      ------------------------------------

CURRENT LIABILITIES:
   Current portion of long-term debt and capital lease                                        $ 1,750,223
   Accounts payable and accrued liabilities                                                       600,762
   Deferred income                                                                                317,561
                                                                                              -----------
                  Total current liabilities                                                     2,668,546

LONG-TERM DEBT AND CAPITAL LEASE, less current portion                                          5,752,181
         SUBORDINATED NOTES, net of discount of $194,874                                        1,344,387
         DEFERRED TAX LIABILITY                                                                 1,171,000
COMMITMENT (Note 12)
STOCKHOLDERS' EQUITY:
   Preferred stock, 5,000,000 shares authorized, par value $0.01:
     10 % Convertible Series A: 1,177,000 shares authorized 381,654 shares outstanding; 10%
       cumulative, liquidation preference of $1,240,376                                             3,817
   Common stock, 30,000,000 shares authorized, par value $0.01; 4,857,632 shares issued and
     outstanding                                                                                   48,576
   Additional paid-in capital                                                                  10,968,733
   Retained earnings                                                                            1,979,847
                                                                                              -----------
                  Total stockholders' equity                                                   13,000,973
                                                                                              -----------
                  Total liabilities and stockholders' equity                                  $23,937,087
                                                                                              ===========







F-9



                NATURAL GAS SERVICES GROUP, INC. AND SUBSIDIARIES

                        CONSOLIDATED STATEMENTS OF INCOME


                                                       FOR THE YEARS ENDED
                                                           DECEMBER 31,
                                                   ----------------------------
                                                       2002            2001
                                                   ------------    ------------
REVENUE:
   Sales, net                                      $  4,335,721    $  4,506,190
   Service and maintenance income                     1,562,650       1,160,916
   Leasing income and interest                        4,398,170       3,095,001
                                                   ------------    ------------
                  Total revenue                      10,296,541       8,762,107

COSTS OF REVENUE:
   Cost of sales                                      3,078,429       3,046,067
   Cost of service                                    1,326,572         986,779
   Cost of leasing                                    1,166,530         909,299
                                                   ------------    ------------
                  Total costs of revenue              5,571,531       4,942,145
                                                   ------------    ------------

         GROSS PROFIT                                 4,725,010       3,819,962

OPERATING EXPENSES:
   Selling expenses                                     499,721         612,670
   General and administrative                         1,218,513       1,105,290
   Depreciation and amortization                      1,166,004         903,166
                                                   ------------    ------------
                  Total operating expenses            2,884,238       2,621,126
                                                   ------------    ------------

INCOME FROM OPERATIONS                                1,840,772       1,198,836

OTHER INCOME (EXPENSE):
   Interest expense                                    (975,719)       (924,382)
   Equity in earnings of joint venture                  485,109         224,231
   Other income                                          19,386         197,208
                                                   ------------    ------------
                  Total other income (expense)         (471,224)       (502,943)
                                                   ------------    ------------

         INCOME BEFORE PROVISION FOR INCOME TAXES     1,369,548         695,893

PROVISION FOR INCOME TAXES:
   Current                                               25,900           9,100
   Deferred                                             557,563         304,800
                                                   ------------    ------------
                  Total income tax expense              583,463         313,900
                                                   ------------    ------------

NET INCOME                                              786,085         381,993
PREFERRED DIVIDENDS                                     106,624          10,908
                                                   ------------    ------------
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS        $    679,461    $    371,085
                                                   ============    ============

NET INCOME PER COMMON SHARE:
   Basic                                           $       0.19    $       0.11
                                                   ============    ============
   Diluted                                         $       0.16    $       0.11
                                                   ============    ============

WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
   Basic                                              3,649,413       3,357,632
   Diluted                                            4,305,053       3,483,987






F-10





                NATURAL GAS SERVICES GROUP, INC. AND SUBSIDIARIES

                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

                 FOR THE YEARS ENDED DECEMBER 31, 2002 AND 2001




                                               PREFERRED STOCK              COMMON STOCK
                                        ---------------------------   ---------------------------
                                           SHARES         AMOUNT         SHARES         AMOUNT
                                        ------------   ------------   ------------   ------------
                                                                         
BALANCES, January 1, 2001                       --     $       --        3,357,632   $     33,576

Issuance of preferred stock                  377,154          3,772           --             --
Warrants issued in connection with
 subordinated notes                             --             --             --             --

Warrants issued for debt guaranty               --             --             --             --

Dividends on preferred stock                    --             --             --             --

Net income                                      --             --             --             --
                                        ------------   ------------   ------------   ------------

BALANCES, January 1, 2002                    377,154          3,772      3,357,632         33,576

Issuance of preferred stock                    4,500             45           --             --

Issuance of common stock and warrants           --             --        1,500,000         15,000

Warrants issued for debt guaranty               --             --             --             --

Repurchase of warrants                          --             --             --             --

Dividends on preferred stock                    --             --             --             --

Net income                                      --             --             --             --
                                        ------------   ------------   ------------   ------------

BALANCES, December 31, 2002                  381,654   $      3,817      4,857,632   $     48,576
                                        ============   ============   ============   ============

                                         ADDITIONAL                      TOTAL
                                           PAID-IN       RETAINED     STOCKHOLDERS'
                                           CAPITAL       EARNINGS       EQUITY
                                        ------------   ------------   ------------


BALANCES, January 1, 2001               $  3,423,854   $    929,301   $  4,386,731

Issuance of preferred stock                  899,461           --          903,233
Warrants issued in connection with
 subordinated notes                           96,364           --           96,364

Warrants issued for debt guaranty             23,137           --           23,137

Dividends on preferred stock                    --          (10,908)       (10,908)

Net income                                      --          381,993        381,993
                                        ------------   ------------   ------------

BALANCES, January 1, 2002                  4,442,816      1,300,386      5,780,550

Issuance of preferred stock                   12,722           --           12,767

Issuance of common stock and warrants      6,514,170           --        6,529,170

Warrants issued for debt guaranty             42,025           --           42,025

Repurchase of warrants                       (43,000)          --          (43,000)

Dividends on preferred stock                    --         (106,624)      (106,624)

Net income                                      --          786,085        786,085
                                        ------------   ------------   ------------

BALANCES, December 31, 2002             $ 10,968,733   $  1,979,847   $ 13,000,973
                                        ============   ============   ============



F-11





                NATURAL GAS SERVICES GROUP, INC. AND SUBSIDIARIES

                      CONSOLIDATED STATEMENTS OF CASH FLOWS


                                                                           FOR THE YEARS ENDED DECEMBER 31,
                                                                           --------------------------------
                                                                                 2002              2001
                                                                           --------------    --------------
                                                                                       
CASH FLOWS FROM OPERATING ACTIVITIES:
   Net income                                                              $      786,085    $      381,993
   Adjustments to reconcile net income to net cash provided by operating
     activities:
     Depreciation and amortization                                              1,166,004           903,166
     Deferred taxes                                                               557,563           304,800
     Amortization of debt issuance costs                                           70,369            64,956
     Gain on disposal of assets                                                   (15,066)         (117,387)
     Warrants issued for debt guarantee                                            42,025            23,137
     Equity in earnings of joint venture                                         (485,109)         (224,231)
     Changes in current assets:
         Trade and other receivables                                              276,588          (360,868)
         Inventory                                                                139,614          (593,403)
         Prepaid expenses and other                                               (11,888)           25,190
     Changes in current liabilities:
         Accounts payable and accrued liabilities                                (348,549)          472,779
         Deferred income                                                          134,187            (9,826)
     Other changes                                                               (105,870)          (30,551)
                                                                           --------------    --------------
                Net cash provided by operating activities                       2,205,953           839,755

CASH FLOWS FROM INVESTING ACTIVITIES:
   Purchase of property and equipment                                          (4,414,952)       (2,220,110)
   Proceeds from sale of property and equipment                                    40,000           328,500
   Decrease in lease receivable                                                    84,908            73,711
   Distributions from joint venture                                               405,466           124,353
   Cash paid for acquisition                                                         --          (1,393,113)
                                                                           --------------    --------------
                Net cash used in investing activities                          (3,884,578)       (3,086,659)

CASH FLOWS FROM FINANCING ACTIVITIES:
   Net proceeds from lines of credit                                            1,956,893           750,000
   Proceeds from long-term debt                                                      --             249,761
   Repayments of long-term debt                                                (4,463,612)         (592,258)
   Dividends on preferred stock                                                  (106,624)          (10,908)
   Net proceeds from sale of  common stock                                      6,529,170              --
   Net proceeds from preferred stock                                               12,767           903,233
   Proceeds from note offering, net of offering costs                                --           1,310,839
   Purchase warrants  from underwriter                                            (43,000)             --
                                                                           --------------    --------------
                Net cash provided by financing activities                       3,885,594         2,610,667

NET INCREASE IN CASH                                                            2,206,969           363,763

CASH, beginning of year                                                           506,669           142,906
                                                                           --------------    --------------

CASH, end of year                                                          $    2,713,638    $      506,669
                                                                           ==============    ==============

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
   Interest paid                                                           $      975,719    $      872,239
                                                                           ==============    ==============
   Income taxes paid                                                       $        4,110    $        2,566
                                                                           ==============    ==============
   Purchase of property and equipment for note payable                     $    1,956,893    $    7,148,949
                                                                           ==============    ==============




F-12



                NATURAL GAS SERVICES GROUP, INC. AND SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
   ------------------------------------------

Organization and Principles of Consolidation
--------------------------------------------
Natural  Gas  Services  Group,  Inc.  (the  "Company"  or  "NGSG")  (a  Colorado
corporation)  was formed on December 18, 1998 for the purposes of combining  the
operations of certain manufacturing, service and leasing entities.

NGSG  currently  conducts  its  operations  through the  following  wholly-owned
subsidiaries:

     |X|  Rotary Gas Systems,  Inc. ("RGS") (a Texas  corporation) is engaged in
          the manufacturing and distribution of natural gas compressor  packages
          for use in the  petroleum  industry  and natural gas flare  stacks and
          ignition systems for use in oilfield, refinery,  petrochemical plant ,
          and landfill applications in New Mexico, California and Texas.
     |X|  NGE Leasing,  Inc. ("NGE") (a Texas corporation) is engaged in leasing
          natural gas compressor  packages to entities in the petroleum industry
          and irrigation motor units to entities in the  agricultural  industry.
          NGE's leasing  income is  concentrated  in New Mexico,  California and
          Texas.
     |X|  Great Lakes Compression,  Inc.,  ("GLC") (a Colorado  corporation) was
          formed in March 2001 and acquired the assets and certain operations of
          a  business  that  fabricates,   leases,   and  services  natural  gas
          compressors  to  producers  of  oil  and  natural  gas,  primarily  in
          Michigan.

The accompanying  financial  statements present the consolidated  results of the
Company and its  wholly-owned  subsidiaries.  Investments  in joint  ventures in
which the Company does not have majority voting control are accounted for by the
equity method.  All intercompany  balances and transactions have been eliminated
in consolidation.

Cash Equivalents
----------------
For purposes of  reporting  cash flows,  the Company  considers  all  short-term
investments  with  an  original  maturity  of  three  months  or less to be cash
equivalents.

Inventory
---------
Inventory is valued at the lower of cost or market.  The cost of inventories are
determined by the first-in,  first-out method.  At December 31, 2002,  inventory
consisted of the following:

                Raw materials                     $  1,303,785
                Work in process                        172,009
                                                  ------------
                                                  $  1,475,794

Property and Equipment
----------------------
Property and equipment are recorded at cost less  accumulated  depreciation  and
amortization. Depreciation and amortization are computed using the straight-line
method over the estimated  useful lives of the assets,  which range from five to
thirty years.

Gains and losses resulting from sales and dispositions of property and equipment
are  included  in current  operations.  Maintenance  and  repairs are charged to
operations as incurred.



F-13



Patents
-------
The Company has  patents  for a flare tip  ignition  device and flare tip burner
pilot.  The costs of the patents are being  amortized on a  straight-line  basis
over nine years,  the remaining life of the patents when acquired.  Amortization
expense  for  patents  of $27,484  was  recognized  for each of the years  ended
December 31, 2002 and 2001. Amortization expense for each of the next five years
is expected to be $27,484 per year.

Goodwill
--------
Goodwill  represents  the cost in excess of fair value of the  identifiable  net
assets  acquired  in  various   acquisitions   and  was  being  amortized  on  a
straight-line  basis  over  20  years.  Amortization  expense  of  $124,425  was
recognized for the year ended December 31, 2001. The Company ceased amortization
of goodwill  effective January 1, 2002 in accordance with Statement of Financial
Accounting Standards ("FAS") No. 142. See Note 14.

FAS 142 requires that goodwill be tested for impairment at least  annually.  The
Company  completed  its initial test for goodwill  impairment  during the second
quarter 2002, at which time no impairment was indicated.

Long-Lived Assets
-----------------
The Company's  policy is to periodically  review the net realizable value of its
long-lived assets, including patents and goodwill,  through an assessment of the
estimated future cash flows related to such assets. In the event that assets are
found to be carried at amounts in excess of estimated  undiscounted  future cash
flows,  then the assets will be adjusted for impairment to a level  commensurate
with a discounted  cash flow analysis of the underlying  assets.  Based upon its
most recent analysis,  the Company  believes no impairment of long-lived  assets
exists at December 31, 2002.

Advertising Costs
-----------------
Advertising  costs are  expensed  as  incurred.  Total  advertising  expense was
$49,720 in 2002 and $56,335 in 2001.

Revenue Recognition
-------------------
Revenue from the sales of custom and  fabricated  and rebuilt  compressors,  and
flare  systems is  recognized  upon  shipment  of the  equipment  to  customers.
Exchange and rebuilt  compressor revenue is recognized when both the replacement
compressor  has been delivered and the rebuild  assessment  has been  completed.
Revenue from compressor  service,  and retrofitting  services is recognized upon
providing  services to the customer.  Operating lease revenue is recognized over
the term of the  agreements.  Maintenance  agreement  revenue is  recognized  as
services are rendered. Deferred income represents items that have been billed to
customers based on contractual agreements, but have not yet been shipped. Rental
and  lease  revenue  is  recognized  over  the  terms  of the  respective  lease
agreements based upon the classification of the lease.

Stock-Based Compensation
------------------------
The Company  accounts for  stock-based  awards to employees  using the intrinsic
value method  described in  Accounting  Principles  Board  Opinion (APB) No. 25,
Accounting  for Stock  Issued to  Employees,  and its  related  interpretations.
Accordingly,  no compensation  expense has been  recognized in the  accompanying
consolidated  financial  statements for stock-based awards to employees when the
exercise  price of the award is equal to or greater than the quoted market price
of the stock on the date of the grant.

FAS  No.  123,  Accounting  for  Stock-Based  Compensation,  and  FAS  No.  148,
Accounting  for  Stock-Based  Compensation  -  Transition  and  Disclosure  - an
Amendment of FASB Statement No. 123, requires  disclosures as if the Company had
applied the fair value method to employee awards rather than the intrinsic value
method.  The fair value of stock-based awards to employees is calculated through



F-14



the use of option pricing models, which were developed for use in estimating the
fair value of traded options,  which have no vesting  restrictions and are fully
transferable. These models also require subjective assumptions, including future
stock price  volatility and expected time to exercise,  which greatly affect the
calculated  values.  The Company's fair value calculations for awards from stock
option plans in 2002 were made using the Black-Scholes option pricing model with
the following  weighted average  assumptions:  expected term, ten years from the
date of grant; stock price volatility 50%; risk free interest rate 5.2% and 4.0%
and no dividends during the expected term as the Company does not have a history
of paying cash dividends. There were no options issued in 2001.

If the  computed  fair values of the  stock-based  awards had been  amortized to
expense  over the vesting  period of the  awards,  net income and net income per
share, basic and diluted, would have been as follows:

                                                                   YEAR ENDED
                                                                  DECEMBER 31,
                                                                      2002
                                                                  ------------

Net income, as reported                                           $    786,085


Add: Stock-based employee compensation included in reported net
income                                                                    --
Deduct: Total stock-based employee compensation expense
determined under fair value method for all awards                      (39,000)
                                                                  ------------
Net income, pro forma                                             $    747,085
                                                                  ------------
Net income per share:
Basic, as reported                                                $       0.19
                                                                  ============
Basic, pro forma                                                  $       0.18
                                                                  ============
Diluted, as reported                                              $       0.16
                                                                  ============
Diluted, pro forma                                                $       0.15
                                                                  ============
Weighted average fair value of options granted during the year    $       2.24
                                                                  ============

Description of Leasing Arrangements
-----------------------------------
The Company's leasing operations  principally  consist of the leasing of natural
gas compressor  packages and flare stacks.  The Company has one seven-year lease
of natural gas irrigation  engines to an agricultural  entity that is classified
as a sales-type  lease.  The  remaining  leases are all  classified as operating
leases. See Note 5.

Income Taxes
------------
The Company files a consolidated tax return with its subsidiaries.  Deferred tax
assets  and  liabilities   are  recognized  for  the  future  tax   consequences
attributable to temporary  differences  between the financial statement carrying
amounts of assets and liabilities and their  respective tax bases, and operating
losses and tax credit  carryforwards.  Deferred tax assets and  liabilities  are
measured  using  enacted tax rates  expected  to apply to taxable  income in the
years in which those  temporary  differences  are  expected to be  recovered  or
settled.

Use of Estimates
----------------
The  preparation  of the  Company's  financial  statements  in  conformity  with
generally accepted accounting  principles  requires the Company's  management to
make  estimates  and  assumptions  that  affect the  amounts  reported  in these
financial  statements and accompanying  notes.  Actual results could differ from





F-15



those  estimates.  Significant  estimates  include the  valuation  of assets and
goodwill  acquired in  acquisitions.  It is at least  reasonably  possible these
estimates could be revised in the near term and the revisions would be material.

Recently Issued Accounting Pronouncements
-----------------------------------------
In June 2001, the Financial  Accounting  Standards  Board ("FASB")  approved for
issuance FAS 143, Asset Retirement  Obligations.  FAS 143 establishes accounting
requirements  for retirement  obligations  associated  with tangible  long-lived
assets,  including  1) the  timing  of the  liability  recognition,  2)  initial
measurement of the liability, 3) allocation of asset retirement cost to expense,
4)  subsequent   measurement  of  the  liability  and  5)  financial   statement
disclosures.   FAS  143  requires  that  an  asset  retirement  cost  should  be
capitalized as part of the cost of the related long-lived asset and subsequently
allocated to expense using a systematic  and rational  method.  The Company will
adopt the statement  effective on January 1, 2003, as required.  The  transition
adjustment  resulting  from  the  adoption  of FAS  143  will be  reported  as a
cumulative  effect of a change in  accounting  principle.  The Company  does not
believe that the adoption of this statement  will have a material  effect on its
financial position, results of operations, or cash flows.

In October  2001,  the FASB  approved for issuance FAS 144,  Accounting  for the
Impairment  or  Disposal  of  Long-Lived  Assets.  FAS 144  replaces  SFAS  121,
Accounting for the Impairment of Long-Lived  Assets and for Long-Lived Assets to
Be Disposed Of. The new accounting model for long-lived assets to be disposed of
by sale applies to all long-lived assets, including discontinued operations, and
replaces  the   provisions  of  APB  Opinion  No.  30,   Reporting   Results  of
Operations-Reporting the Effects of Disposal of a Segment of a Business, for the
disposal  of  segments of a business.  FAS 144  requires  that those  long-lived
assets be measured  at the lower of  carrying  amount or fair value less cost to
sell, whether reported in continuing  operations or in discontinued  operations.
Therefore,  discontinued operations will no longer be measured at net realizable
value or include  amounts for operating  losses that have not yet occurred.  FAS
144 also  broadens  the  reporting  of  discontinued  operations  to include all
components of an entity with operations that can be distinguished  from the rest
of the entity and that will be  eliminated  from the ongoing  operations  of the
entity in a  disposal  transaction.  The  provisions  of FAS 144  applied to the
Company  beginning  January  1, 2002 and did not have a  material  effect on its
financial position, results of operations, or cash flows.

In July 2002, the FASB issued FAS No. 146,  Accounting for Costs Associated with
Exit or Disposal  Activities.  FAS 146 requires  companies  to  recognize  costs
associated  with exit or disposal  activities when they are incurred rather than
at the date of a  commitment  to an exit or  disposal  plan.  Examples  of costs
covered  by FAS  146  include  lease  termination  costs  and  certain  employee
severance  costs  that  are  associated  with  a   restructuring,   discontinued
operation,  plant closing, or other exit or disposal activity.  FAS 146 is to be
applied  prospectively to exit or disposal  activities  initiated after December
31, 2002.  The adoption of FAS 146 is not expected to have a material  effect on
the Company's financial position or results of its operations.

In  December  2002,  the FASB  issued FAS  No.148,  Accounting  for  Stock-Based
Compensation  - Transition  and Disclosure - an Amendment of FASB Statement 123.
For entities that change their accounting for stock-based  compensation from the
intrinsic  method to the fair value  method under FAS 123, the fair value method
is to be applied  prospectively  to those awards  granted after the beginning of
the period of adoption  (the  prospective  method).  The  amendment  permits two
additional transition methods for adoption of the fair value method. In addition
to the  prospective  method,  the entity can  choose to either (i)  restate  all
periods   presented   (retroactive   restatement   method)  or  (ii)   recognize
compensation  cost from the  beginning  of the fiscal year of adoption as if the
fair  value  method had been used to account  for awards  (modified  prospective
method).  For fiscal years beginning  December 15, 2003, the prospective  method
will no longer be allowed.  The Company  currently  accounts for its stock-based
compensation  using the intrinsic  value method as proscribed by APB Opinion No.
25, Accounting for Stock Issued to Employees, and plans on continuing using this
method to account for stock options;  therefore, it does not intend to adopt the
transition requirements as specified in FAS 148. The Company has adopted the new
FAS 148 disclosure requirements with these financial statements.



F-16



2. ACQUISITION
   -----------

In March 2001, the Company acquired the assets,  primarily  compressors,  office
furniture  and  fixtures,  building and land,  of Dominion  Michigan  Production
Services, Inc. ("Dominion") for a total purchase price of $8 million, subject to
adjustment. $1 million of the purchase price was paid in cash with the remainder
financed by the seller (see Note 7). The transaction was accounted for under the
purchase  method of accounting  and the purchase  price was allocated to the net
assets  acquired based on their  estimated fair values.  The excess of cost over
the fair value of net assets  acquired  totaled  approximately  $741,000 and was
recorded as goodwill as of the  acquisition  date. The operating  results of the
acquired  business  have been  included in the  Company's  financial  statements
beginning April 1, 2001. The following  unaudited pro forma information has been
prepared as if the  acquisition  of the assets of Dominion  had  occurred at the
beginning  of  the  year  ended  December  31,  2001.  Such  information  is not
necessarily  reflective  of the actual  results that would have occurred had the
acquisition  occurred on that date.

Net sales                                               $9,563,146
Net income                                              $429,276
Net income per common share                             $0.13
Net income per common share, assuming dilution          $0.12

In  connection  with the  acquisition,  a total fee of $440,000  was paid to the
investment  banker/advisor.  A director  of the Company has a 1% interest in the
investment banker/advisor.

3. PROPERTY AND EQUIPMENT
   ----------------------

     Property and equipment consists of the following at December 31, 2002:

                 Land and building               $  1,345,740
                 Leasehold improvements               124,902
                 Equipment and furniture              604,134
                 Rental equipment                  15,092,994
                 Vehicles                             736,688
                                                 ------------
                                                   17,904,458
                 Less accumulated depreciation     (2,209,512)
                                                 ------------
                                                 $ 15,694,946
                                                 ============


Depreciation  expense for property and equipment of $1,137,520  and $751,257 was
recognized for the years ended December 31, 2002 and 2001, respectively.

4. INVESTMENT IN JOINT VENTURE
   ---------------------------

The Company  owns a  non-controlling  50%  interest in a joint  venture,  Hy-Bon
Rotary  Compression,  LLC  ("Hy-Bon").  Hy-Bon  leases  natural gas  compressors
provided by each party and provides the related  service and  maintenance to the
customers.  Income is split  between the  parties  based on the revenue of their
respective  compressors on lease.  The Company's  investment is accounted for on
the equity method, in which the Company  recognizes its share of the earnings or
loss of the joint venture  determined in  accordance  with the Hy-Bon  operating


F-17



agreement.  The Company's  total equity method  investment in Hy-Bon at December
31, 2002 totaled  $198,313.  The Company's  equity in the earnings of Hy-Bon was
$485,109  and  $224,231  in 2002 and 2001,  respectively.  Summarized  financial
information of Hy-Bon follows:

                                               December 31,
                                                   2002
                                              --------------
BALANCE SHEET:
    ASSETS:
      Current assets                          $      393,271
      Equipment, net                                  65,857
                                              --------------
               Total assets                   $      459,128
                                              ==============

    LIABILITIES:
         Current liabilities                  $       84,666
      Notes payable                                   27,951
      Members' capital                               346,511
                                              --------------
               Total liabilities and equity   $      459,128
                                              ==============


                                              For the Years Ended December 31,
                                              --------------------------------
                                                   2002              2001
                                              --------------    --------------
STATEMENT OF OPERATIONS:
    Total revenue                             $    1,296,728    $      644,170
    Total expenses                                   388,483           193,756
                                              --------------    --------------
               Net income                     $      908,245    $      450,414
                                              ==============    ==============


Subsequent to December 31, 2002, the Company agreed to purchase the  compressors
owned by the other party that are used in the joint venture for $2,150,000.

5. LEASING ACTIVITY
   ----------------

The  following  lists the  components  of the net  investment  in the  Company's
sales-type lease as of December 31, 2002:


Total minimum lease payments receivable       $      243,072
Less unearned income                                 (32,560)
                                              --------------
                                              $      210,512
                                              ==============

Future  minimum  lease  payments are  approximately  $122,000 per year until the
lease expiration in December 2004.

The Company leases natural gas compressor  packages to entities in the petroleum
industry.  These leases are  classified as operating  leases and generally  have
original lease terms of one to five years and continue on a month-to-month basis
thereafter.  Future  minimum lease  payments for leases not on a  month-to-month
basis at December 31, 2002 are as follows:

          Year Ended December 31,
                   2003                       $      799,831
                   2004                              828,085
                   2005                              861,208
                   2006                              245,743
                                              --------------
                  Total                       $    2,734,867
                                              ==============

6. LINE OF CREDIT
   --------------

The Company has a line of credit  with a financial  institution  that allows for
borrowings  up to $750,000,  bears  interest at the prime rate plus 1% (5.25% at
December 31, 2002) and requires monthly interest  payments with principal due at


F-18



maturity  on  March  15,  2003.  The  line  of  credit  is   collateralized   by
substantially all of the assets of the Company.  At December 31, 2002, there was
no outstanding balance on this line of credit.

The line of credit and first three notes listed in Note 7 are with the same bank
and include certain covenants, the most restrictive of which require the Company
to maintain  certain  working  capital,  debt to equity and cash flow ratios and
certain  minimum net worth.  The Company was in  compliance  with all  covenants
except the cash flow ratio at December 31, 2002.  The bank granted the Company a
waiver until June 30, 2003 for its non-compliance with the cash flow ratio.



























F-19





7. LONG-TERM DEBT
   --------------

Long-term debt at December 31, 2002 consisted of the following:
                                                                                        
Notepayable to a bank, interest at bank's prime rate plus 1.0% (5.25% at
    December 31, 2002), monthly payments of principal of $58,333 plus interest,
    until maturity in October 15, 2007. The note is collateralized by substantially
    all of the assets of the Company. See Note 6 regarding loan covenants                  $ 3,383,334

Note  payable to a bank, interest at prime rate plus 1% (5.25% at December 31,
    2002), monthly  payments of principal of $30,889 plus interest until maturity
    on November 15, 2007. The note is collateralized by substantially all of the
    assets of the Company. See Note 6 regarding loan covenants                               1,853,340

Note  payable to a bank,  interest at prime rate plus 1% (5.25% at December 31, 2002),
    monthly  payments of principal of $45,746 plus interest  until maturity on March 15,
    2006.  The note is collateralized by substantially all of the assets of the
    Company. See Note 6 regarding loan covenants                                             1,734,947

Notepayable to a bank, interest at 11%, monthly payments of principal and
    interest totaling $2,614, until maturity in September 2010,
    collateralized by a building
                                                                                               214,321

Note  payable to an  individual, interest at 10%, monthly payments of principal
    and interest totaling $1,255 until maturity in August 2010. This note is
    collateralized by a building                                                                80,443

Various  notes  payable to a bank, interest rates ranging from prime plus 1%
    (5.25% at December  31, 2002) to 7.75%, monthly  payments ofprincipal and
    interest until maturity dates ranging from July 2003 to July 2004. These notes
    are collateralized by various vehicles                                                      60,545


Capital lease                                                                                   43,540

Other notes payable, various terms                                                             131,934
                                                                                           -----------

Total                                                                                        7,502,404
                                                                                           -----------

Less current portion                                                                        (1,750,223)
                                                                                           -----------
                                                                                           $ 5,752,181
                                                                                           ===========










F-20



Maturities of long-term  debt based on  contractual  requirements  for the years
ending December 31 are as follows:

           2003                             $    1,750,223
           2004                                  1,720,683
           2005                                  1,675,968
           2006                                  1,180,057
           2007                                    977,654
        Thereafter                                 197,819
                                            --------------
                                            $    7,502,404
                                            ==============

8. SUBORDINATED NOTES
   ------------------

On October 31, 2000, the Company  initiated a private  placement of subordinated
debt units.  Each unit consists of a $25,000 10% subordinated  note due December
31, 2006 and a  five-year  warrant to purchase  10,000  shares of the  Company's
common stock at $3.25 per share.  Interest  only is payable  annually,  with all
principal  due at maturity.  The warrants  were valued at their  estimated  fair
market  value  resulting  in a discount  relating  to the  warrants  of $87,128.
Proceeds from this offering totaled $1,539,260. Under the terms of the offering,
all proceeds from the notes must be used for the  operations of NGE Leasing.  In
connection  with the offering,  a placement agent was paid a 10% cash commission
and 3%  non-accountable  expense  allowance  totaling  $200,104,  and was issued
warrants in the same form as those  issued in the offering for a total of 61,570
shares. The warrants were valued at their estimated fair market value of $9,236.
Total debt  issuance  costs of $237,658 are recorded as a debt  discount and the
total debt discount of $324,786 is being amortized using the effective  interest
rate method over the life of the notes.  The balance of the  subordinated  debt,
net of unamortized discount of $194,874, is $1,344,387 at December 31, 2002.

Certain  stockholders,  officers and directors purchased units in this offering,
(totaling  $259,261 in notes and warrants  representing  103,704  shares) on the
same terms and conditions as non-affiliated purchasers in the offering.

9. INCOME TAXES
   ------------

The provision for income taxes consists of the following:

                                                             2002         2001
                                                         ----------   ----------
     Current provision:
         Federal                                         $     --     $     --
         State                                               25,900        9,100
                                                         ----------   ----------
                                                             25,900        9,100
     Deferred provision:
         Federal                                            491,363      269,100
         State                                               66,200       35,700
                                                         ----------   ----------
                                                            557,563      304,800
                                                         ----------   ----------
                                                         $  583,463   $  313,900
                                                         ==========   ==========







F-21



         The  income  tax  effects of  temporary  differences  that give rise to
significant  portions of  deferred  income tax assets and  (liabilities)  are as
follows:

                                                                        2002
                                                                    -----------
Deferred income tax assets:
    Net operating loss                                              $   892,000
    Other                                                                48,000
                                                                    -----------

          Total deferred income tax assets                              940,000
                                                                    -----------

Deferred income tax liabilities:
    Property and equipment                                           (1,962,000)
    Goodwill and other intangible assets                               (149,000)
                                                                    -----------

          Total deferred income tax liabilities                      (2,111,000)
                                                                    -----------

          Net deferred income tax liabilities                       $(1,171,000)
                                                                    ===========

     The effective tax rate differs from the statutory rate as follows:

                                                         2002           2001
                                                     -----------    -----------
Statutory rate                                               34%            34%
State and local taxes                                         7%             6%
Non-deductible goodwill amortization                        --              14%
Other non-deductible expenses                                 2%           --
Other                                                       --              (9%)
                                                     -----------    -----------
Effective rate                                               43%            45%
                                                     ===========    ===========


At December 31,  2002,  the Company had  available  federal net  operating  loss
("NOL") carryforwards of approximately  $2,420,000,  which may be used to reduce
future taxable income and begin to expire in 2020 through 2022.

10. STOCKHOLDERS' EQUITY
    --------------------

Initial Public Offering
-----------------------
In October, 2002, the Company closed an initial public offering in which it sold
1,500,000  shares of common stock and warrants to purchase  1,500,000  shares of
common stock for a total of $7,875,000.  Costs and  commissions  associated with
the offering totaled  $1,345,830.  The warrants are exercisable  anytime through
October  2006 at  $6.25  per  share.  In  connection  with  this  offering,  the
underwriter received options to purchase 150,000 shares of common stock at $6.25
per share and warrants to purchase 150,000 shares at $0.3125 per share.

Warrants
--------
In April 2002 and March 2001,  five-year  warrants to purchase  16,472 shares of
common  stock  at $3.25  per  share  and  68,524  shares  at  $2.50  per  share,
respectively,   were  issued  to  certain  board  members  and  stockholders  as
compensation  for  their  debt  guarantees.   These  warrants  were  immediately
exercisable  and were recorded at their estimated fair values of $42,025 in 2002
and $23,137 in 2001.









F-22



Preferred Stock
---------------
The Company has a total of 5,000,000  authorized  preferred shares,  with rights
and  preferences  as  designated  by the Board of  Directors.  Of the  preferred
shares,  1,177,000  shares are  designated  10%  Convertible  Series A Preferred
Stock.  The Series A shares have a cumulative  annual dividend rate of 10%, when
and if declared by the Board of Directors  payable  thirty days after the end of
each quarter. Holders are entitled to one vote per share and the Series A shares
are  convertible  into  common  stock  initially  at a price of $3.25 per share,
subject to adjustment based on the market price and various other contingencies.
In addition,  Series A shares will automatically be converted to common stock on
a  one-for-one  basis if or when the  Company's  common stock trades on a public
exchange at a price of $6.50 per share or greater for twenty  consecutive  days.
The  Series A shares  have a  liquidation  preference  of $3.25 per  share  plus
accrued and unpaid dividends over common stock. The Company  initiated a private
placement of its Series A shares in July 2001.  Under the terms of the placement
agreement,  the Company  offered a maximum of 770,000 Series A shares at a price
of $3.25 per share.  As of December  31, 2001,  the Company had  received  gross
proceeds of $1,225,751 from the offering, net of $322,518 of offering costs, for
377,154 Series A shares.  Included in the offering  costs,  are a 10% commission
and 3%  non-accountable  expense allowance paid to the placement agent. In 2002,
additional  proceeds of $14,625  were  received  representing  4,500  additional
Series A shares issued.  Total Series A shares  outstanding at December 31, 2002
were  381,654.  A total of 18,000 and 12,000  Series A shares were issued in the
offering to a director and a  stockholder,  respectively,  on the same terms and
conditions as those sold to non-affiliated purchasers in the private offering.

11. STOCK-BASED COMPENSATION

Stock Options
-------------
In December 1998, the Board of Directors adopted the 1998 Stock Option Plan (the
"Plan").  150,000  shares of common stock have been reserved for issuance  under
the Plan. All options granted under the Plan will expire ten years after date of
grant. The option price is to be determined by the Board of Directors on date of
grant.

In September  1999, the Company  granted 27,000  non-qualified  stock options to
certain employees to purchase the Company's common stock at $2.00 per share. The
options vest over three years and expire in 2009.

In April 2002, the Company granted 42,000 non-qualified stock options to certain
employees to purchase the Company's common stock at $3.25 per share. The options
vest over three years and expire in April 2012.  Also,  in  December  2002,  the
Company granted 7,500 non-qualified stock options to the three outside directors
to  purchase  the  Company's  common  stock at $3.88 per share any time  through
December 2012.

In September 1999, the Company granted 100,000 non-qualified stock options to an
advisory  director to purchase  the  Company's  common  stock at $2.00 per share
anytime through  September 30, 2004.  These options were not granted pursuant to
the Plan described above.









F-23



The following is a summary of activity for the stock options outstanding for the
years ended December 31, 2002 and 2001:



                                      DECEMBER 31, 2002       DECEMBER 31, 2001
                                   ---------------------   ---------------------
                                                Weighted                Weighted
                                     Number     Average      Number      Average
                                       Of       Exercise      Of        Exercise
                                     Shares      Price       Shares       Price
                                   ---------   ---------   ---------   ---------

  Outstanding, beginning of year     112,000   $    2.00     112,000   $    2.00
        Canceled or expired             --          --          --          --
        Granted                       49,500        3.35        --          --
        Exercised                       --          --          --          --
                                   ---------   ---------   ---------   ---------
  Outstanding, end of year           161,500   $    2.41     112,000   $    2.00
                                   =========   =========   =========   =========
  Exercisable, end of year           128,800   $    2.21     112,000   $    2.00
                                   =========   =========   =========   =========

12. COMMITMENT
    ----------

401(k) Plan
-----------
Effective January 1, 2001, the Company offered a 401(k) Plan (the "Plan") to all
employees  that had reached the age of eighteen and had  completed six months of
service.  The  participants  may contribute up to 15% of their salary.  Employer
contributions  are  subject  to Board  discretion  and are  subject to a vesting
schedule  of 20% each year after the first  year and 100%  after six years.  The
Company contributed $50,233 to the Plan in 2002.

13. MAJOR CUSTOMERS AND CONCENTRATION OF CREDIT RISK
    ------------------------------------------------

Sales to one  customer in the year ended  December  31, 2002 and one customer in
the  year  ended  December  31,  2001  amounted  to a  total  of 30%  and 26% of
consolidated revenue,  respectively. No other single customer accounted for more
than 10% of the  Company's  sales in 2002 or 2001.  At December  31,  2002,  the
Company had one customer that accounted for 12% of the Company's  trade accounts
receivable.  The Company  generally  does not obtain  collateral,  but  requires
deposits  of as much as 50% on large  custom  contracts.  The  Company  performs
periodic credit evaluations on its customers'  financial  condition and believes
that no allowance for doubtful  accounts for trade  receivables  is necessary at
December 31, 2002.

14. GOODWILL - ADOPTION OF STATEMENT 142
    ------------------------------------

The  Company  adopted  FAS 142 on January  1, 2002,  at which time it ceased the
amortization  of goodwill.  At December 31, 2002,  the Company's  goodwill had a
carrying  value of  $2,589,654.  Pursuant to FAS 142, the Company  completed its
initial test for goodwill  impairment in 2002 and no impairment  was  indicated.
The following table sets forth the effect of the adoption of FAS 142 on the 2001
financial statements as if it had been adopted on January 1, 2001.








F-24


                NATURAL GAS SERVICES GROUP, INC. AND SUBSIDIARIES

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


                                                       FOR THE YEAR
                                                          ENDED
                                                       DECEMBER 31,
                                                           2001
                                                       ------------

             Reported net income                       $    381,993
             Add back: Goodwill amortization, net of
                tax effect                                  124,425
                                                       ------------
             Adjusted net income                       $    506,418
                                                       ============

             Basic earnings per share:
                Reported net income                    $        .11
                Goodwill amortization                           .04
                                                       ------------
                Adjusted net income                    $        .15
                                                       ============

             Diluted earnings per share:
                Reported net income                    $        .11
                Goodwill amortization                           .03
                                                       ------------
                Adjusted net income                    $        .14
                                                       ============

15. SEGMENT INFORMATION
    -------------------

FAS  No.  131,   Disclosures   About  Segments  of  an  Enterprise  and  Related
Information,   establishes  standards  for  public  companies  relating  to  the
reporting  of  financial  and  descriptive  information  about  their  operating
segments in  financial  statements.  Operating  segments  are  components  of an
enterprise  about which  separate  financial  information  is available  that is
evaluated  regularly  by chief  operating  decision  makers in  deciding  how to
allocate  resources and in assessing  performance.  The Company  identifies  its
segments based on its subsidiary  entities.  The Company's  reportable operating
segments have been determined as separately  identifiable  business  units.  The
Company  measures  segment earnings as income before income taxes. The following
amounts are expressed in thousands:






                                          RGS         NGE         GLC        NGSG         Elim.        Total
                                       ---------   ---------   ---------   ---------    ---------    ---------
                                                                                   
For the year ended December 31,
2002:
Revenue from external customers        $   3,298   $   2,319   $   4,680   $    --      $    --      $  10,297
Inter-segment revenue                      5,756          45          20        --         (5,821)        --
Gross profit                               1,329       1,669       1,727        --           --          4,725
Depreciation and amortization                122         439         558          47         --          1,166
Interest expense                               9         392         537          38         --            976
Other income                                   4          15        --          --           --             19
Equity in the net income of investee
 accounted for by the equity method         --           485        --          --           --            485
Income taxes                                --          --          --           583         --            583
Net income                                   411       1,177         364      (1,166)        --            786

As of December 31, 2002:
Segment assets                             3,779      10,905       8,587         666         --         23,937
Goodwill                                   1,873        --           717        --           --          2,590


For the year ended December 31,
2001:
Revenue from external customers        $   3,841   $   1,519   $   3,402   $    --      $    --      $   8,762
Inter-segment revenue                      2,691        --          --          --         (2,691)        --
Gross profit                               1,231       1,076       1,513        --           --          3,820
Depreciation and amortization                104         252         423         124         --            903
Interest expense                               4         395         489          36         --            924
Other income                                  19         130           3          45         --            197
Equity in the net income of investee
 accounted for by the equity method         --           224        --          --           --            224
Income taxes                                --          --          --           314         --            314
Net income                                   180         549         307        (654)        --            382

As of December 31, 2001:
Segment assets                             1,200       6,107       9,181       2,322         --         18,810
Goodwill                                   1,873        --           717        --           --          2,590












F-26



--------------------------------------------

We   have   not   authorized   any   dealer,
salesperson  or  other  person  to give  any
information  or to make  any  representation
not  contained  in  this  prospectus.   This
prospectus  does not  constitute an offer to
sell, or a solicitation  of an offer to buy,
any offer or  solicitation  by anyone in any
jurisdiction not authorized, or in which the
person making such an offer or  solicitation
is not  qualified  to do so or to any person
to whom it is unlawful to make such an offer
or   solicitation.   By   delivery  of  this
prospectus  we do not imply  that  there has
been no  change in our  affairs  or that the
information in this prospectus is correct as
of any time subsequent to its date.

-------------------------------------------
                                                            NATURAL GAS SERVICES
                                                                GROUP, INC.
                   TABLE OF CONTENTS
                                                Page

About Natural Gas Services, Inc.............     2
Summary of the Offering.....................     3
Risk Factors................................     6
Use of Proceeds.............................    15              ________________
Dividend Policy.............................    16
Selected Consolidated Financial Data........    17                 PROSPECTUS
Management's Discussion and                                     ________________
  Analysis of Financial Condition
  and Results of Operations.................    20
Business ...................................    32
Legal Proceedings...........................    43
Where You Can Find Additional
  Information...............................    43
Market for Our Securities and
Related Stockholder Matters.................    43
  Management................................    45
Security Ownership of Certain
  Beneficial Owners and Management..........    53              __________, 2003
Certain Relationships and Related
  Transactions..............................    55
Selling Securityholders.....................    57
Plan of Distribution........................    58
Description of Securities...................    58
Experts.....................................    62
Index to Financial Statements...............   F-1




                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 24. Indemnification of Directors and Officers.

         Section  7-109-102 of the Colorado  Business  Corporation Act permits a
Colorado  corporation to indemnify any director against liability if such person
acted in good faith and, in the case of conduct in an official capacity with the
corporation, that the director's conduct was in the corporation's best interests
and, in all other cases, that the director's conduct was at least not opposed to
the best interests of the corporation  or, with regard to criminal  proceedings,
the  director  had no  reasonable  cause to believe the  director's  conduct was
unlawful.

         Section  7-109-103 of the Colorado  Business  Corporation  Act provides
that,  unless limited by its articles of incorporation,  a Colorado  corporation
shall indemnify a person who was wholly successful,  on the merits or otherwise,
in the  defense of any  proceeding  to which the person was a party  because the
person is or was a director,  against reasonable expenses incurred by him or her
in connection with the proceeding.

         Section 3 of  Article IX of our  articles  of  incorporation,  filed as
Exhibit 3.1 hereto,  provides  that we shall  indemnify,  to the maximum  extent
permitted  by law in  effect  from  time to  time,  any  person  who is or was a
director,  officer,  agent,  fiduciary  or employee  of ours  against any claim,
liability or expense  arising against or incurred by such person made party to a
proceeding because such person is or was a director,  officer,  agent, fiduciary
or employee of ours or because such person is or was serving another entity as a
director,  officer,  partner,  trustee,  employee,  fiduciary  or  agent  at our
request. We further have the authority to the maximum extent permitted by law to
purchase and maintain insurance providing such indemnification.

         Article VI of our bylaws, filed as Exhibit 3.4 hereto, provides for the
indemnification of certain persons.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to our directors, officers and controlling persons
pursuant to the foregoing provisions, or otherwise, we have been advised that in
the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Securities Act of 1933 and is,
therefore, unenforceable.



                                      II-1


Item 25.  Other Expenses of Issuance and Distribution.

         Expenses payable by us in connection with the issuance and distribution
of the securities being registered hereby are as follows:

         SEC Registration Fee(1)                $      --

         NASD Filing Fee                                -0-

         American Stock Exchange Listing Fee            -0-

         Accounting Fees and Expenses                 5,000*

         Legal Fees and Expenses                     10,000*

         Printing                                     2,000*

         Transfer Agent Fee                           2,000

         Miscellaneous                                1,000
                                                -----------
         Total                                  $    20,000
                                                ===========

(1)      Paid in  connection  with  the  initial  filing  of  this  Registration
         Statement.

         (23) Estimated

Item 26. Recent Sales of Unregistered Securities.


         Beginning in October 2000, we issued 62 units comprised of Series A 10%
Subordinated  Notes  and Five  Year  Warrants  to  Purchase  Common  Stock to 34
investors. The units were issued in transactions not involving a public offering
and were issued in reliance upon the  exemption  from  registration  provided by
Section  4(2) of the  Securities  Act of 1933. A Form D relating to the offering
was filed with the Securities and Exchange  Commission.  The persons to whom the
units were issued had access to full  information  concerning us and represented
that they  acquire  the shares for their own  account and not for the purpose of
distribution.  The certificates for the securities  contain a restrictive legend
advising  that the  securities  may not be offered for sale,  sold or  otherwise
transferred  without having first been registered under the 1933 Act or pursuant
to an exemption from registration  under the 1933 Act. The underwriter  involved
in this offering was Barry-Shino Securities, Inc. which received a commission of
$153,926, a nonaccountable expense allowance of $46,178 and warrants to purchase
61,570 shares of our common stock at $3.25 per share.

         In March 2001, we issued five year  warrants to purchase  68,524 shares
of our common  stock at $2.50 per share in  exchange  for  persons  guaranteeing
approximately  $1,749,000 of our debt. The warrants were issued in a transaction
not  involving a public  offering and were issued in reliance upon the exemption
from  registration  provided by Section 4(2) of the  Securities Act of 1933. The
persons  to whom  the  warrants  were  issued  had  access  to full  information
concerning us. The certificates  for the warrants  contain a restrictive  legend
advising  that the warrants and  underlying  shares may not be offered for sale,
sold or otherwise  transferred  without having first been  registered  under the
1933 Act or pursuant to an exemption from registration under the 1933 Act. There
was no underwriter involved in the exchange of the warrants for the guaranteeing
of the debt.



                                      II-2



         Beginning in July 2001, we issued 381,654 shares of our 10% Convertible
Series A Preferred Stock to 35 investors. The shares were issued in transactions
not  involving a public  offering and were issued in reliance upon the exemption
from registration provided by Section 4(2) of the Securities Act of 1933. A Form
D  relating  to  the  offering  was  filed  with  the  Securities  and  Exchange
Commission.  The  persons  to whom the  shares  were  issued  had access to full
information  concerning  us and  represented  that they  acquired the shares for
their own account and not for the purpose of distribution.  The certificates for
the shares  contain a  restrictive  legend  advising  that the shares may not be
offered  for sale,  sold or  otherwise  transferred  without  having  first been
registered  under the 1933 Act or pursuant  to an  exemption  from  registration
under the 1933 Act.  The  underwriter  of this  offering was  Neidiger,  Tucker,
Bruner,  Inc. which received a commission of $124,037 a  nonaccountable  expense
allowance  of  $37,211  and  warrants  to  purchase  38,165  shares  of our  10%
Convertible Series A Preferred Stock.

         In April 2002, we issued five year  warrants to purchase  16,472 shares
of  our  common  stock  at  $3.25  per  share  in  exchange  for  three  persons
guaranteeing  approximately  $824,000 of our debt. The warrants were issued in a
transaction not involving a public offering and were issued in reliance upon the
exemption  from  registration  provided  by  Section  4(2) of the 1933 Act.  The
persons  to whom  the  warrants  were  issued  had  access  to full  information
concerning us. The certificates  for the warrants  contain a restrictive  legend
advising  that the warrants and  underlying  shares may not be offered for sale,
sold or otherwise  transferred  without having first been  registered  under the
1933 Act or pursuant to an exemption from registration under the 1933 Act. There
was no underwriter involved in the exchange of the warrants for the guaranteeing
of the debt.

         In June 2003 we issued 100,000 shares of our common stock to one person
upon the exercise of an option that the person owned.  The shares were issued in
a transaction  not involving a public  offering and were issued in reliance upon
the exemption  from  registration  provided by Section 4(2) of the 1933 Act. The
person to whom the shares were issued had access to full information  concerning
us. The certificate  for the shares contains a restrictive  legend advising that
the shares may not be offered for sale,  sold or otherwise  transferred  without
having first been registered under the 1933 Act or pursuant to an exemption from
registration  under the 1933  Act.  There was no  underwriter  involved  in this
offering.

         In September  2003,  we issued 26,549 shares of our common stock to one
person and one company upon the  exercise of  outstanding  warrants.  The shares
were issued in  transactions  not involving a public offering and were issued in
reliance upon the exemption  from  registration  provided by Section 4(2) of the
1933  Act.  The  persons  to whom the  shares  were  issued  had  access to full
information concerning us. The certificates for the shares contain a restrictive
legend  advising that the shares may not be offered for sale,  sold or otherwise
transferred  without having first been registered under the 1933 Act or pursuant
to an exemption from  registration  under the 1933 Act. There was no underwriter
involved in these offerings.


                                      II-3





Item 27.  Exhibits.
          --------

The  following  is a list of all  exhibits  filed  as part of this  Registration
Statement:

Exhibit No.    Description and Method of Filing
-----------    --------------------------------

2.1            Purchase  and Sale  Agreement by and between  Hy-Bon  Engineering
               Company, Inc. and NGE Leasing, Inc. (2)

3.1            Articles of incorporation.*

3.2            Amendment to articles of incorporation  dated March 31, 1999, and
               filed on May 25, 1999.*

3.3            Amendment to articles of  incorporation  dated July 25, 2001, and
               filed on July 30, 2001.*

3.4            Amendment to articles of incorporation  adopted on June 18, 2003,
               and filed on June 19, 2003. (1)

3.5            Bylaws.*

4.1            Form of warrant certificate.*

4.2            Form of warrant agent agreement.*

4.3            Form of lock-up agreement.*

4.4            Form of  representative's  option  for  the  purchase  of  common
               stock.*

4.5            Form of representative's option for the purchase of warrants.*

4.6            Form of consulting  agreement between Natural Gas Services Group,
               Inc. and the representative.*

10.1           1998 Stock Option Plan.*

10.2           Asset  Purchase   Agreement   between   Natural  Gas  Acquisition
               Corporation  and Great Lakes  Compression,  Inc. dated January 1,
               2001.*

10.3           Amendment  to Guaranty  Agreement  between  Natural Gas  Services
               Group, Inc. and Dominion Michigan Production Services, Inc.*

10.4           Form of Series A 10% Subordinated Notes due December 31, 2006.*

10.5           Form of Five-Year Warrants to Purchase Common Stock.*

10.6           Warrants issued to Berry-Shino Securities, Inc.*

10.7           Warrants issued to Neidiger, Tucker, Bruner, Inc.*

10.8           Form of warrant issued in March 2001 for guaranteeing debt.*


                                      II-4



Exhibit No.    Description and Method of Filing
-----------    --------------------------------

10.9           Form of warrant issued in April 2002 for guaranteeing debt.*

10.10          Exhibits 3(C)(1), 3(C)(2), 3(C)(3), 3(1)(4),  13(d)(1),  13(d)(2)
               and  13(d)(3) to Asset  Purchase  Agreement  between  Natural Gas
               Acquisition  Corporation and Great Lakes Compression,  Inc. dated
               January 1, 2001.*

10.11          Articles of  Organization  of Hy-Bon Rotary  Compression,  L.L.C.
               dated April 17, 2000 and filed on April 20, 2001.*

10.12          Regulations of Hy-Bon Rotary Compression, L.L.C.*

10.13          First Amended and Restated  Loan  Agreement  between  Natural Gas
               Services Group, Inc. and Western National Bank (3)

10.14          Termination  of  Employment  Agreement  Letter  relating  to  the
               Employment Agreement of Alan Kurus. (4)

10.15          Termination  of  Employment  Agreement  Letter  relating  to  the
               Employment Agreement of Wayne L. Vinson. (4)

10.27          Termination  of  Employment  Agreement  Letter  relating  to  the
               Employment Agreement of Earl R. Wait. (4)

21             Subsidiaries of the registrant.*

23.1           Consent of HEIN + ASSOCIATES LLP. (1)

*Previously filed as Exhibits to this Registration Statement.

(1) Filed herewith

(2) Filed as exhibit 2.1 to the Registrant's Current Report on Form 8-K filed on
March 6, 2003 and incorporated herein by reference.

(3) Filed as exhibit 10.1 to the  Registrant's  Current Report on Form 8-K filed
on April 14, 2003 and incorporated herein by reference.

(4) Filed as exhibits 10.25,  10.26 and 10.27 to  Registrant's  Annual Report on
Form  10-KSB for the year ended  December  31, 2002 and  incorporated  herein by
reference

Item 28. Undertakings.
         ------------

         The undersigned will:

(1)  File,  during  any  period  in  which it  offers  or  sells  securities,  a
post-effective amendment to this registration statement to:

                  (i) include any prospectus required by section 10(a)(3) of the
         Securities Act;

                  (ii)  reflect  in the  prospectus  any facts or events  which,
         individually  or  together,  represent  a  fundamental  change  in  the
         information in the registration statement; and




                                      II-5





                  (iii) include any additional or changed  material  information
         on the plan of distribution.

(2)  For   determining   liability   under  the   Securities   Act,  treat  each
post-effective  amendment  as a new  registration  statement  of the  securities
offered,  and the offering of the securities at that time to be the initial bona
fide offering.

(3) File a  post-effective  amendment  to remove  from  registration  any of the
securities that remain unsold at the end of the offering.

         Insofar as indemnification for liabilities arising under the Securities
Act may be  permitted to  directors,  officers  and  controlling  persons of the
undersigned pursuant to the foregoing provisions,  or otherwise, the undersigned
has been advised that in the opinion of the Securities  and Exchange  Commission
such  indemnification  is against  public policy as expressed in the Act and is,
therefore,  unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the undersigned of expenses incurred
or paid by a director,  officer or controlling  person of the undersigned in the
successful  defense of any  action,  suit or  proceeding)  is  asserted  by such
director,  officer or controlling person in connection with the securities being
registered,  the  undersigned  will,  unless in the  opinion of its  counsel the
matter  has  been  settled  by  controlling  precedent,  submit  to a  court  of
appropriate  jurisdiction  the question  whether such  indemnification  by it is
against public policy as expressed in the Securities Act and will be governed by
the final adjudication of such issue.

















                                      II-6


                                   SIGNATURES

         In accordance with the  requirements of the Securities Act of 1933, the
registrant certifies that it has reasonable grounds to believe that it meets all
of the  requirements  of filing on Form SB-2 and  authorized  this  registration
statement to be signed on its behalf by the undersigned, in the City of Midland,
State of Texas on September 30, 2003.

                                        NATURAL GAS SERVICES GROUP, INC.


                                         /s/ Wayne L. Vinson
                                        ----------------------------------------
                                        Wayne L. Vinson, President and Principal
                                                Executive Officer


                                         /s/ Earl R. Wait
                                        ----------------------------------------
                                        Earl R. Wait, Principal Financial and
                                        Accounting Officer

         In accordance with the requirements of the Securities Act of 1933, this
registration statement was signed by the following persons in the capacities and
on the dates stated:


Signature                                 Title               Date
---------                                 -----               ----

/s/ Wallace O. Sellers                  Director              September 30, 2003
--------------------------
Wallace O. Sellers

/s/ Wayne L. Vinson                     Director              September 30, 2003
--------------------------
Wayne L. Vinson

/s/ Scott W. Sparkman                    Director             September 30, 2003
--------------------------
Scott W. Sparkman

/s/ Charles G. Curtis                    Director             September 30, 2003
--------------------------
Charles G. Curtis

/s/ James T. Grigsby                     Director             September 30, 2003
--------------------------
James T. Grigsby

/s/ Gene A. Strasheim                    Director             September 30, 2003
--------------------------
Gene A. Strasheim

/s/ Richard L. Yadon                     Director             September 30, 2003
--------------------------
Richard L. Yadon










                                      II-7


                                 EXHIBIT INDEX


Exhibit        Description and Method of Filing
--------       --------------------------------
No.
---

2.1            Purchase  and Sale  Agreement by and between  Hy-Bon  Engineering
               Company, Inc. and NGE Leasing, Inc. (2)

3.1            Articles of incorporation.*

3.2            Amendment to articles of incorporation  dated March 31, 1999, and
               filed on May 25, 1999.*

3.3            Amendment to articles of  incorporation  dated July 25, 2001, and
               filed on July 30, 2001.*

3.4            Amendment to articles of incorporation  adopted on June 18, 2003,
               and filed on June 19, 2003. (1)

3.5            Bylaws.*

4.1            Form of warrant certificate.*

4.2            Form of warrant agent agreement.*

4.3            Form of lock-up agreement.*

4.4            Form of  representative's  option  for  the  purchase  of  common
               stock.*

4.5            Form of representative's option for the purchase of warrants.*

4.6            Form of consulting  agreement between Natural Gas Services Group,
               Inc. and the representative.*

10.1           1998 Stock Option Plan.*

10.2           Asset  Purchase   Agreement   between   Natural  Gas  Acquisition
               Corporation  and Great Lakes  Compression,  Inc. dated January 1,
               2001.*

10.3           Amendment  to Guaranty  Agreement  between  Natural Gas  Services
               Group, Inc. and Dominion Michigan Production Services, Inc.*

10.4           Form of Series A 10% Subordinated Notes due December 31, 2006.*

10.5           Form of Five-Year Warrants to Purchase Common Stock.*

10.6           Warrants issued to Berry-Shino Securities, Inc.*

10.7           Warrants issued to Neidiger, Tucker, Bruner, Inc.*



                                      II-8



Exhibit No.    Description and Method of Filing
-----------    --------------------------------

10.8           Form of warrant issued in March 2001 for guaranteeing debt.*

10.9           Form of warrant issued in April 2002 for guaranteeing debt.*

10.10          Exhibits 3(C)(1), 3(C)(2), 3(C)(3), 3(1)(4),  13(d)(1),  13(d)(2)
               and  13(d)(3) to Asset  Purchase  Agreement  between  Natural Gas
               Acquisition  Corporation and Great Lakes Compression,  Inc. dated
               January 1, 2001.*

10.11          Articles of  Organization  of Hy-Bon Rotary  Compression,  L.L.C.
               dated April 17, 2000 and filed on April 20, 2001.*

10.12          Regulations of Hy-Bon Rotary Compression, L.L.C.*

10.13          First Amended and Restated  Loan  Agreement  between  Natural Gas
               Services Group, Inc. and Western National Bank (3)

10.14          Termination  of  Employment  Agreement  Letter  relating  to  the
               Employment Agreement of Alan Kurus. (4)

10.15          Termination  of  Employment  Agreement  Letter  relating  to  the
               Employment Agreement of Wayne L. Vinson. (4)

10.27          Termination  of  Employment  Agreement  Letter  relating  to  the
               Employment Agreement of Earl R. Wait. (4)

21             Subsidiaries of the registrant.*

23.1           Consent of HEIN + ASSOCIATES LLP. (1)

*Previously filed as Exhibits to this Registration Statement.

(1) Filed herewith

(2) Filed as exhibit 2.1 to the Registrant's Current Report on Form 8-K filed on
March 6, 2003 and incorporated herein by reference.

(3) Filed as exhibit 10.1 to the  Registrant's  Current Report on Form 8-K filed
on April 14, 2003 and incorporated herein by reference.

(4) Filed as exhibits 10.25,  10.26 and 10.27 to  Registrant's  Annual Report on
Form  10-KSB for the year ended  December  31, 2002 and  incorporated  herein by
reference










                                      II-9