Filed by NYSE Group, Inc.
              Pursuant to Rule 425 under the Securities Act of 1933, as amended,
                                 and deemed filed pursuant to Rule 14a-12 of the
                                  n  Securities Exchange Act of 1934, as amended
                                                              
                                                              Subject Companies:
                                                   New York Stock Exchange, Inc.
                                                      Archipelago Holdings, Inc.
                                                 (Commission File No. 001-32274)

                                                        Date: September 14, 2005

     On  September  14,  2005,  the New York  Stock  Exchange,  Inc.  issued the
following bulletin to its members:



                                      * * *

                           Special Membership Bulletin

                          [Letterhead of John A. Thain]




Date: September 14, 2005

To:  NYSE Members

From: John A. Thain

Re:  Update on the NYSE-Archipelago Merger


     Today we filed  Amendment No. 1 to our Form S-4 to respond to the first set
of SEC comments on the proxy statement. The amended S-4 will be available on our
website at  www.nyse.com  and the SEC's website at  www.sec.gov or you may get a
copy from Mary Yeager (212-656-2062).

     In  response  to  concerns  many of you  raised,  we have  made a number of
modifications  to the original  terms of the deal:  we have provided a mechanism
for  you  to  elect  to  receive  either  more  cash  or  more  stock;  we  have
significantly  shortened  the lock-up  period to one, two and three  years,  and
reiterated our intention to hold follow-on secondary offerings as quickly as the
market  permits;  and we have limited the employee  initial  stock awards to $50
million with no stock delivered until the end of year three. These modifications
keep the  fundamentals  of the deal in place,  while helping our Members achieve
their financial needs.

The markets continue to view the deal positively.  Archipelago's stock price has
been trading around $38,  implying a NYSE Group valuation of $6.1 billion and an
implied seat value of $3.4 million. Over the past several weeks a number of NYSE
seats  have  traded at $2.8 - $2.9  million,  with one trade at $3  million,  an
all-time record.

The strategy behind the deal continues to be well received:

     -    We become a  for-profit,  public  company  better able to compete with
          U.S. and global players.

     -    We acquire a  high-speed,  low-cost  platform for ETFs,  options,  and
          fixed  income  products  that can be traded  either on our  Floor,  on
          Archipelago's platform, or in both venues.

     -    We gain a  significant  position  in the OTC  equity  market,  and the
          ability to develop a  second-brand  listing  business to compete  with
          Nasdaq.

     -    We add entrepreneurial, innovative management talent.

These  objectives  would be difficult  and  time-consuming  to accomplish in any
other way,  and the  strategic  fit between our two  companies is ideal from our
perspective.





A few Members continue to misunderstand the nature of this transaction. The deal
we are pursuing is comparable to the initial public  offering of the NYSE and an
acquisition  of  Archipelago  by the NYSE for  stock.  In our  case,  these  two
transactions  occur  simultaneously.  We are not  selling  the  NYSE and have no
intention of doing so. You the Members  will be the majority  owners and control
the NYSE Group going forward.

We  announced  our  financial  results  on August  15.  Our net income was $13.0
million for the quarter  ended June 30,  2005,  compared to $5.0  million in the
year-ago  quarter and $26.0 million for the first quarter of 2005.  Our revenues
have been trending up for the past several quarters,  with a large uptick during
the first quarter from a $19.7 million  regulatory fine and other  non-recurring
revenues.  Expenses are down from last year, led by reduced  spending in general
and administrative expenses and professional services. These results reflect our
commitment to efficiency  and the success of the initial  measures we are taking
to prepare ourselves to become a for-profit, publicly-traded entity.

New listings remain strong, with 101 new companies added to our list so far this
year. The 80 IPO's listed represent 97% of qualified  dollars raised for a total
of $28 billion domestically,  plus 100% of the qualified non-U.S. dollars raised
totaling  $500  million.  Among the  companies  scheduled  to list in the coming
months are Ameriprise  Financial  Inc., the spinoff from American  Express,  and
Innovene,  the  British  Petroleum  carveout  that may be one of the biggest new
offerings of the year.

Archipelago  announced  first half 2005 results of $16.2  million net income and
$27.1 million  pre-tax  income on revenues of $263.7  million.  The results were
negatively  impacted  by $8.4  million of  nonrecurring  merger  related  costs.
Eliminating  non-recurring  items for both Archipelago and the NYSE (principally
the $19.7 million fine and $6.0 million of insurance reimbursement for the NYSE)
and  annualizing  the first half results would yield  Archipelago  net income of
$37.6  million and NYSE net income of $61.8  million,  or a 38% and 62% relative
contribution by Archipelago and the NYSE, respectively.

Our competitors  have been active over the past several weeks.  The Boston Stock
Exchange will team up with  Citigroup,  CSFB,  Fidelity,  and Lehman Brothers to
launch an all-electronic  equities trading market next year. Six major brokerage
firms  announced in mid-August  they were  investing in the  Philadelphia  Stock
Exchange,  which offers both equities and options trading.  And Nasdaq announced
it would  offer  connectivity  and  routing  to options  exchanges  in the first
quarter of 2006.  These  developments  show the speed at which our  industry  is
evolving and reaffirm the underlying  competitive forces we face. In addition to
our traditional competitors, we must also address internalization.  The best way
to counter these threats is to complete our merger as quickly as possible  while
introducing  new products and services that enable us to meet  customers'  needs
and continuing to offer the best prices in our listed stocks.

A handful of Members  are  attempting  to impede  the prompt  completion  of our
merger through their lawsuits  against the NYSE and its Board of Directors.  One
lawsuit  attempted  to force the  premature  and  selective  release  of certain
documents.  We made sure that all Members  received a very  complete  S-4 at the
same time and had equal access to  additional  information.  The second  lawsuit
seeks to prevent the Membership from exercising their right to vote. The lawsuit
asks the court to enjoin the  transaction.  We believe  this  lawsuit is without
merit.  In  order  to  minimize  the time and  expense  of this  litigation,  we
attempted to have the lawsuit  dismissed  on  procedural  grounds.  This process
required the judge to assume that all allegations made by the plaintiff, however
false or  misleading,  were true. The judge declined to dismiss the case, and we
believe  that  assuring  the  earliest  possible  vote leaves too little time to
procure an appellate reversal. Unfortunately, this means that we

                                       2




will have to go through the time and expense of additional document  production,
depositions and hearings. You should be aware that the merger agreement requires
NYSE and Arca to deliver at least $350 million and $150  million,  respectively,
in cash to the NYSE  Group in  accordance  with the 70:30  ratio.  Any NYSE cash
exceeding  the 70:30  ratio  would be  available  to  distribute  to  Members in
addition to the $300,000 per seat already  contemplated.  We currently expect to
have excess cash, and we intend to distribute it to the Members. EVERY DOLLAR WE
SPEND ON THIS  LITIGATION  IS A DIRECT  REDUCTION IN WHAT WE CAN PAY OUT TO YOU.
REGRETTABLY,  YOUR  MONEY IS BEING  USED IN AN  ATTEMPT TO DENY YOU THE RIGHT TO
VOTE.

We continue to make  progress on other  aspects of the deal.  The  Department of
Justice has reduced its document  request for the next phase of their  antitrust
review.  The 19b-4 rule filing has been drafted and will be  discussed  with the
SEC. The tax ruling is in progress.  We continue to plan for the Member  meeting
and vote to occur in November with a closing of the transaction early in 2006.

Finally,  you  will by now have  received  a  memorandum  announcing  a  special
contribution  of $1 million from the NYSE  Foundation  to the American Red Cross
for disaster  relief in Louisiana,  Mississippi  and Alabama.  In addition,  the
Foundation will match  contributions to the American Red Cross (up to a total of
$150,000)  from  employees and from Members.  All Members who are  interested in
contributing  should send checks  made out to the  American  Red Cross to Arthur
Cashin, c/o Stock Exchange Luncheon Club, 11 Wall Street, NY, NY 10005.

We will continue to report to you directly and through your Board of Executives
representatives on an ongoing basis. I look forward to seeing you at our October
6 Member Town Hall meeting.


cc:  NYSE Chairman Marshall N. Carter 
     NYSE Board of Directors


                                       3


IMPORTANT ACQUISITION INFORMATION WITH RESPECT TO THE MERGER

In connection with the proposed merger of the New York Stock Exchange, Inc.
("NYSE") and Archipelago Holdings, Inc. ("Archipelago"), NYSE Group, Inc. filed
with the Securities and Exchange Commission ("SEC") a registration statement on
Form S-4 (File no: 333-126780), containing a preliminary joint proxy
statement/prospectus regarding the proposed transaction. The registration
statement has not yet become effective. The parties will file other relevant
documents concerning the proposed transaction with the SEC.

Such final documents, however, are not currently available. NYSE MEMBERS AND
ARCHIPELAGO STOCKHOLDERS ARE URGED TO READ THE FINAL JOINT PROXY STATEMENT/
PROSPECTUS REGARDINGTHE PROPOSED TRANSACTION WHEN IT BECOMES AVAILABLE, BECAUSE
IT WILL CONTAIN IMPORTANT INFORMATION. NYSE members and Archipelago stockholders
can obtain a free copy of the final joint proxy statement/ prospectus, as well
as other filings containing information about NYSE and Archipelago without
charge, at the SEC's website (http://www.sec.gov). Copies of the final joint
proxy statement/ prospectus can also be obtained, without charge, once they are
filed with the SEC, by directing a request to the Office of the Corporate
Secretary, NYSE, 11 Wall Street, New York 10005, 212-656-2061 or to Archipelago,
Attention: Investor Relations, 100 S. Wacker Drive, Suite 1800, Chicago,
Illinois 60606 or calling (888) 514-7284.

The NYSE, Archipelago and their respective directors and executive officers and
other members of management and employees may be deemed to be participants in
the solicitation of proxies from Archipelago stockholders in respect of the
proposed transaction. Information regarding Archipelago's directors and
executive officers is available in Archipelago's proxy statement for its 2005
annual meeting of stockholders, dated March 31, 2005.

Additional information regarding the interests of such potential participants
will be included in the joint proxy statement/prospectus and the other relevant
documents filed with the SEC when they become available. This document shall not
constitute an offer to sell or the solicitation of an offer to buy any
securities, nor shall there be any sale of securities in any jurisdiction in
which such offer, solicitation or sale would be unlawful prior to registration
or qualification under the securities laws of any such jurisdiction. No offering
of securities shall be made except by means of a prospectus meeting the
requirements of Section 10 of the Securities Act of 1933, as amended.


FORWARD-LOOKING STATEMENTS

Certain statements in this document may contain forward-looking information
regarding the NYSE and Archipelago and the combined company after the completion
of the transactions that are intended to be covered by the safe harbor for
"forward-looking statements" provided by the Private Securities Litigation
Reform Act of 1995. These statements include, but are not limited to, the
benefits of the business combination transaction involving the NYSE and
Archipelago, including future financial and operating results, the new company's
plans, objectives, expectations and intentions and other statements that are not
historical facts. Such statements are based upon the current beliefs and
expectations of the NYSE's and Archipelago's management and are subject to
significant risks and uncertainties. Actual results may differ from those set
forth in the forward-looking statements.

The following factors, among others, could cause actual results to differ from
those set forth in the forward-looking statements: the ability to obtain
governmental approvals of the transaction on the proposed terms and schedule;
the failure of the NYSE members or Archipelago shareholders to approve the
transaction; the risk that the businesses will not be integrated successfully;
the risk that the cost savings and any other synergies from the transaction may
not be fully realized or may take longer to realize than expected; disruption
from the transaction making it more difficult to maintain relationships with
customers, employees or suppliers; competition and its effect on pricing,
spending, third party relationships and revenues; social and political
conditions such as war, political unrest or terrorism; general economic
conditions and normal business uncertainty. Additional risks and factors are
identified in Archipelago's filings with the Securities Exchange Commission,
including its Report on Form 10-K for the fiscal year ending December 31, 2004
which is available on Archipelago's website at http://www.Archipelago.com, and
the registration statement on Form S-4 (File no: 333-126780) filed by NYSE
Group, Inc. with the SEC.

You should not place undue reliance on forward-looking statements, which speak
only as of the date of this document. Except for any obligation to disclose
material information under the federal securities laws, none of the NYSE,
Archipelago or the combined company after the completion of the transactions
undertake any obligation to release publicly any revisions to any
forward-looking statements to reflect events or circumstances after the date of
this document.

The NYSE, Archipelago and their respective directors and executive officers and
other members of management and employees may be deemed to be participants in
the solicitation of proxies from Archipelago stockholders in respect of the
proposed transaction. Information regarding Archipelago's directors and
executive officers is available in Archipelago's proxy statement for its 2005
annual meeting of stockholders, dated March 31, 2005. Additional information
regarding the interests of such potential participants will be included in the
joint proxy statement/prospectus and the other relevant documents filed with the
SEC when they become available.

This document shall not constitute an offer to sell or the solicitation of an
offer to buy any securities, nor shall there be any sale of securities in any
jurisdiction in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such
jurisdiction. No offering of securities shall be made except by means of a
prospectus meeting the requirements of Section 10 of the Securities Act of 1933,
as amended.