SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

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

        Date of Report (Date of earliest event reported): April 15, 2004

                                 HYBRIDON, INC.
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             (Exact name of Registrant as Specified in its Charter)



                                                                     
          Delaware                             001-31918                               04-3072298
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(State or Other Jurisdiction            (Commission File Number)           (IRS Employer Identification No.)
     of Incorporation)



345 Vassar Street, Cambridge, Massachusetts                    02139
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  (Address of Principal Executive Offices)                  (Zip Code)


Registrant's telephone number, including area code: (617) 679-5500


                                 Not Applicable
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          (Former Name or Former Address if Changed Since Last Report)







ITEM 5.    OTHER EVENTS AND REQUIRED FD DISCLOSURE

         On January 30, 2004, the Securities and Exchange Commission declared
effective the Registration Statement on Form S-3 (File No. 333-111903) (the
"Registration Statement") of Hybridon, Inc. (the "Company"). The Registration
Statement permits the Company to issue, in one or more offerings, shares of
common stock and warrants to purchase shares of common stock. The total number
of shares of common stock that the Company may issue in such offerings or upon
exercise of warrants issued in such offerings may not exceed 20,000,000.

         On April 15, 2004, the Company entered into a Placement Agency
Agreement (the "Placement Agency Agreement") with Thomas Weisel Partners LLC,
Rodman & Renshaw and Merriman Curhan Ford & Co. (the "Placement Agents").
Pursuant to the Placement Agency Agreement, the Placement Agents have agreed to
act as the Company's placement agents in connection with an offering of units,
each unit consisting of 100 shares of the Company's common stock and warrants
to purchase 18 shares of the Company's common stock at an exercise price of
$1.14 per share (the "Offering"), under the Registration Statement.

         In connection with the Placement Agency Agreement and the Offering, the
Company is filing as exhibits to this Current Report on Form 8-K the following
documents:

     o   as Exhibit 1.1, the Placement Agency Agreement, including as Exhibit B
         thereto the form of Purchase Agreement to be entered into by the
         Company and the investors;

     o   as Exhibit 4.1, the form of Warrant to be issued to investors in the
         Offering; and

     o   as Exhibits 5.1 and 23.1, the legal opinion of Hale and Dorr LLP
         relating to the shares of common stock and warrants to be issued and
         sold in the Offering.

         This Current Report on Form 8-K does not constitute an offer to sell or
the solicitation of an offer to buy any securities of the Company and these
securities cannot be sold in any state in which such offer, solicitation or sale
would be unlawful prior to registration or qualification under the securities
laws of such state.

         In addition, the Company is providing below, under the caption "Risk
Factors," an updated description of the risks and uncertainties that could
materially affect the Company's business, financial condition and results of
operations.



                                  RISK FACTORS

         The following important factors could cause actual results to differ
from those indicated by forward-looking statements made by us in this current
report on Form 8-K and elsewhere from time to time.

         RISKS RELATING TO OUR FINANCIAL RESULTS AND NEED FOR FINANCING

WE HAVE INCURRED SUBSTANTIAL LOSSES AND EXPECT TO CONTINUE TO INCUR LOSSES. WE
WILL NOT BE SUCCESSFUL UNLESS WE REVERSE THIS TREND.

         We have incurred losses in every year since our inception, except for
2002 when our recognition of revenues under a license and collaboration
agreement resulted in us reporting net income for that year. As of December 31,
2003, we had incurred operating losses of approximately $283.9 million. We
expect to continue to incur substantial operating losses in future periods.
These losses, among other things, have had and will continue to have an adverse
effect on our stockholders' equity, total assets and working capital.

         We have received no revenues from the sale of drugs. To date, almost
all of our revenues have been from collaborative and license agreements and the
sale of manufactured synthetic DNA and reagent products by our Hybridon
Specialty Products Division prior to our selling that division in September
2000. We have devoted substantially all of our efforts to research and
development, including clinical trials, and we have not completed development of
any drugs. Because of the numerous risks and uncertainties associated with
developing drugs, we are unable to predict the extent of any future losses,
whether or when any of our products will become commercially available, or when
we will become profitable, if at all.

WE WILL NEED ADDITIONAL FINANCING, WHICH MAY BE DIFFICULT TO OBTAIN. OUR FAILURE
TO OBTAIN NECESSARY FINANCING OR DOING SO ON UNATTRACTIVE TERMS COULD ADVERSELY
AFFECT OUR DISCOVERY AND DEVELOPMENT PROGRAMS AND OTHER OPERATIONS.

         We will require substantial funds to conduct research and development,
including preclinical testing and clinical trials of our drugs. We will also
require substantial funds to conduct regulatory activities and to establish
commercial manufacturing, marketing and sales capabilities. We believe that,
based on our current operating plan, our existing cash and cash equivalents and
short term investments will be sufficient to fund our cash requirements through
the end of December 2004, or, if the offering contemplated by the placement
agency agreement attached to this current report on Form 8-K is consummated, to
fund our cash requirements through mid-2005. We will need to raise additional
funds to operate our business beyond such time.

         Additional financing may not be available to us when we need it or may
not be available to us on favorable terms. If we are unable to obtain adequate
funding on a timely basis or at all, we may be required to significantly curtail
one or more of our discovery or development programs. For example, we
significantly curtailed expenditures on our research and development programs
during 1999 and 2000 because we did not have sufficient funds available to
advance these programs at planned levels. We could be required to seek funds
through arrangements with collaborators or others that may require us to
relinquish rights to some of our technologies, drug candidates or drugs which we
would otherwise pursue on our own.

         If we raise additional funds by issuing equity securities, our then
existing stockholders will experience dilution. In addition, the terms of the
financing may adversely affect the holdings or the rights of existing
stockholders.

OUR FORMER INDEPENDENT PUBLIC ACCOUNTANT, ARTHUR ANDERSEN LLP, HAS BEEN FOUND
GUILTY OF A FEDERAL OBSTRUCTION OF JUSTICE CHARGE. ARTHUR ANDERSEN LLP HAS NOT
CONSENTED TO THE INCLUSION OF ITS AUDIT REPORT WITH RESPECT TO OUR CONSOLIDATED
FINANCIAL STATEMENTS IN OUR ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED
DECEMBER 31, 2003, AND YOU MAY BE UNABLE TO EXERCISE EFFECTIVE REMEDIES AGAINST
ARTHUR ANDERSEN LLP IN ANY LEGAL ACTION.

         Our former independent public accountant, Arthur Andersen LLP, provided
us with auditing services for prior fiscal periods through December 31, 2001,
including issuing an audit report with respect to our audited consolidated
financial statements as of and for the year ended December 31, 2001, which
report is included in our annual report on Form 10-K for the year ended December
31, 2003. On June 15, 2002, a jury in Houston, Texas




found Arthur Andersen LLP guilty of a federal obstruction of justice charge
arising from the federal government's investigation of Enron Corp. On August 31,
2002, Arthur Andersen LLP ceased practicing before the Securities and Exchange
Commission.

         We were unable to obtain Arthur Andersen LLP's consent to include its
report with respect to our audited consolidated financial statements as of and
for the year ended December 31, 2001, in our annual report on Form 10-K for the
year ended December 31, 2003. As a result, you may not have an effective remedy
against Arthur Andersen LLP in connection with a material misstatement or
omission with respect to those audited consolidated financial statements or any
filing that we may make with the Securities and Exchange Commission. In
addition, even if you were able to assert such a claim, as a result of its
conviction and other lawsuits, Arthur Andersen LLP may fail or otherwise have
insufficient assets to satisfy claims made by investors or by us that might
arise under federal securities laws or otherwise relating to any alleged
material misstatement or omission with respect to our audited consolidated
financial statements.

              RISKS RELATING TO OUR BUSINESS, STRATEGY AND INDUSTRY

WE ARE DEPENDING HEAVILY ON THE SUCCESS OF OUR LEAD PRODUCTS, HYB2055, OUR LEAD
2ND GENERATION IMO COMPOUND, AND GEM231, OUR LEAD 2ND GENERATION ANTISENSE
COMPOUND, WHICH ARE IN CLINICAL DEVELOPMENT. IF WE ARE UNABLE TO COMMERCIALIZE
EITHER OR BOTH OF THESE PRODUCTS, OR EXPERIENCE SIGNIFICANT DELAYS IN DOING SO,
OUR BUSINESS WILL BE MATERIALLY HARMED.

         We are investing a significant portion of our time and financial
resources in the development of our two lead internal products, HYB2055, our
lead 2nd generation IMO compound, and GEM 231, our lead 2nd generation antisense
compound. We anticipate that in the near term our ability to generate product
revenues will depend heavily on the successful development and commercialization
of these products. The commercial success of these products will depend on
several factors, including the following:

         o    successful completion of clinical trials;

         o    receipt of marketing approvals from the United States Food and
              Drug Administration, or FDA, and similar foreign regulatory
              authorities;

         o    establishing commercial manufacturing arrangements with third
              party manufacturers;

         o    launching commercial sales of the product, whether alone or in
              collaboration with others; and

         o    acceptance of the product in the medical community and with
              third party payors.

         Our efforts to commercialize these products are at an early stage, as
we are currently conducting phase 1 and phase 1/2 clinical trials of these
product candidates. If we are not successful in commercializing either or both
of these products, or are significantly delayed in doing so, our business will
be materially harmed.

IF OUR CLINICAL TRIALS ARE UNSUCCESSFUL, OR IF THEY ARE SIGNIFICANTLY DELAYED,
WE MAY NOT BE ABLE TO DEVELOP AND COMMERCIALIZE OUR PRODUCTS.

         We may not be able to successfully complete any clinical trial of a
potential product within any specified time period. In some cases, we may not be
able to complete the trial at all. Moreover, clinical trials may not show our
potential products to be both safe and efficacious. Thus, the FDA and other
regulatory authorities may not approve any of our potential products for any
indication.

         In order to obtain regulatory approvals for the commercial sale of our
products, we will be required to complete extensive clinical trials in humans to
demonstrate the safety and efficacy of our drug candidates. In 2003, we
commenced phase 1 clinical trials of HYB2055, in oncology patients and in
healthy volunteers, and we are currently conducting a phase 1/2 clinical trial
of GEM231, for the treatment of solid tumor cancer. We may not be able to obtain
authority from the FDA or other equivalent foreign regulatory agencies to
complete these trials or commence and complete any other clinical trials.


         The results from preclinical testing of a drug candidate that is under
development may not be predictive of results that will be obtained in human
clinical trials. In addition, the results of early human clinical trials may not
be predictive of results that will be obtained in larger scale, advanced stage
clinical trials. A failure of one or more of our clinical trials can occur at
any stage of testing. We may experience numerous unforeseen events during, or as
a result of, preclinical testing and the clinical trial process that could delay
or prevent our ability to receive regulatory approval or commercialize our
products, including:

         o    regulators or institutional review boards may not authorize us
              to commence a clinical trial or conduct a clinical trial at a
              prospective trial site;

         o    our preclinical tests or clinical trials may produce negative
              or inconclusive results, and we may decide, or regulators may
              require us, to conduct additional preclinical testing or
              clinical trials or we may abandon projects that we expect to
              be promising;

         o    we might have to suspend or terminate our clinical trials if
              the participating patients are being exposed to unacceptable
              health risks;

         o    regulators or institutional review boards may require that we
              hold, suspend or terminate clinical research for various
              reasons, including noncompliance with regulatory requirements;

         o    the cost of our clinical trials may be greater than we
              currently anticipate; and

         o    the effects of our products may not be the desired effects or
              may include undesirable side effects or the products may have
              other unexpected characteristics.

         As an example, in 1997, after reviewing the results from the clinical
trial of GEM91, our lead 1st generation antisense compound at the time, we
determined not to continue the development of GEM91 and suspended clinical
trials of this product candidate.

         The rate of completion of clinical trials is dependent in part upon the
rate of enrollment of patients. Patient accrual is a function of many factors,
including:

         o    the size of the patient population,

         o    the proximity of patients to clinical sites,

         o    the eligibility criteria for the study,

         o    the nature of the study,

         o    the existence of competitive clinical trials, and

         o    the availability of alternative treatments.


         Our product development costs will increase if we experience delays in
our clinical trials. We do not know whether planned clinical trials will begin
as planned, will need to be restructured or will be completed on schedule, if at
all. Significant clinical trial delays also could allow our competitors to bring
products to market before we do and impair our ability to commercialize our
products.

WE FACE SUBSTANTIAL COMPETITION WHICH MAY RESULT IN OTHERS DISCOVERING,
DEVELOPING OR COMMERCIALIZING DRUGS BEFORE OR MORE SUCCESSFULLY THAN US.

         The biotechnology industry is highly competitive and characterized by
rapid and significant technological change. We face, and will continue to face,
intense competition from organizations such as pharmaceutical and biotechnology
companies, as well as academic and research institutions and government
agencies. Some of these organizations are pursuing products based on
technologies similar to our technologies. Other of these organizations have
developed and are marketing products, or are pursuing other technological
approaches designed to produce products, that are competitive with our product
candidates in the therapeutic effect these competitive products have




on diseases targeted by our product candidates. Our competitors may discover,
develop or commercialize products or other novel technologies that are more
effective, safer or less costly than any that we are developing. Our competitors
may also obtain FDA or other regulatory approval for their products more rapidly
than we may obtain approval for ours.

         Many of our competitors are substantially larger than we are and have
greater capital resources, research and development staffs and facilities than
we have. In addition, many of our competitors are more experienced than we are
in drug discovery, development and commercialization, obtaining regulatory
approvals and drug manufacturing and marketing.

         We anticipate that the competition with our products and technologies
will be based on a number of factors including:

         o    product efficacy,

         o    safety,

         o    reliability,

         o    availability,

         o    price and

         o    patent position.

         The timing of market introduction of our products and competitive
products will also affect competition among products. We also expect the
relative speed with which we can develop products, complete the clinical trials
and approval processes and supply commercial quantities of the products to the
market to be an important competitive factor. Our competitive position will also
depend upon our ability to attract and retain qualified personnel, to obtain
patent protection or otherwise develop proprietary products or processes and to
secure sufficient capital resources for the period between technological
conception and commercial sales.

BECAUSE THE PRODUCTS THAT WE MAY DEVELOP WILL BE BASED ON NEW TECHNOLOGIES AND
THERAPEUTIC APPROACHES, THE MARKET MAY NOT BE RECEPTIVE TO THESE PRODUCTS UPON
THEIR INTRODUCTION.

         The commercial success of any of our products for which we may obtain
marketing approval from the FDA or other regulatory authorities will depend upon
their acceptance by the medical community and third party payors as clinically
useful, cost-effective and safe. Many of the products that we are developing are
based upon technologies or therapeutic approaches that are relatively new and
unproven. The FDA has not granted marketing approval to any products based on
antisense technology or IMO-like technology and no such products are currently
being marketed, except for one antisense product that is currently being
marketed by another company for the treatment of cytomegalovirus retinitis, an
infectious disease, in patients with AIDs. As a result, it may be more difficult
for us to achieve market acceptance of our products. Our efforts to educate the
medical community on these potentially unique approaches may require greater
resources than would be typically required for products based on conventional
technologies or therapeutic approaches. The safety, efficacy, convenience and
cost-effectiveness of our products as compared to competitive products will also
affect market acceptance.

COMPETITION FOR TECHNICAL AND MANAGEMENT PERSONNEL IS INTENSE IN OUR INDUSTRY
AND WE MAY NOT BE ABLE TO SUSTAIN OUR OPERATIONS OR GROW IF WE ARE UNABLE TO
ATTRACT AND RETAIN KEY PERSONNEL.

         Our success is highly dependent on the retention of principal members
of our technical and management staff, including Stephen Seiler and Sudhir
Agrawal. Mr. Seiler, our Chief Executive Officer, has extensive experience in
the pharmaceutical industry and as an investment banker and provides strategic
leadership for us. The loss of Mr. Seiler's services would be detrimental to the
execution of our strategic plan. Dr. Agrawal serves as our President and Chief
Scientific Officer. Dr. Agrawal has made significant contributions to the field
of nucleic acid chemistry and is named as an inventor on over 200 U.S. patents
and patent applications. Dr. Agrawal provides the scientific leadership for our
research and development activities and directly supervises our research staff.
The loss of Dr. Agrawal's services would be detrimental to our ongoing
scientific progress.


         We are a party to employment agreements with each of Mr. Seiler and Dr.
Agrawal, but each of these agreements may be terminated by us or the employee
for any reason or no reason at any time upon notice to the other party. We do
not carry key man life insurance for Mr. Seiler or Dr. Agrawal.

         Furthermore, our future growth will require hiring a significant number
of qualified technical and management personnel. Accordingly, recruiting and
retaining such personnel in the future will be critical to our success. There is
intense competition from other companies and research and academic institutions
for qualified personnel in the areas of our activities. If we are not able to
continue to attract and retain, on acceptable terms, the qualified personnel
necessary for the continued development of our business, we may not be able to
sustain our operations or grow.

                                REGULATORY RISKS

WE MAY NOT BE ABLE TO OBTAIN MARKETING APPROVAL FOR PRODUCTS RESULTING FROM OUR
DEVELOPMENT EFFORTS.

         All of the products that we are developing or may develop in the future
will require additional research and development, extensive preclinical studies
and clinical trials and regulatory approval prior to any commercial sales. This
process is lengthy, often taking a number of years, is uncertain and is
expensive. Since our inception, we have conducted clinical trials of a number of
compounds. In 1997, we determined not to continue clinical development of GEM91,
our lead product candidate at the time. Currently, we are conducting clinical
trials of two compounds, GEM231 and HYB2055.

         We may need to address a number of technological challenges in order to
complete development of our products. Moreover, these products may not be
effective in treating any disease or may prove to have undesirable or unintended
side effects, toxicities or other characteristics that may preclude our
obtaining regulatory approval or prevent or limit commercial use.

WE ARE SUBJECT TO COMPREHENSIVE REGULATORY REQUIREMENTS, WHICH ARE COSTLY AND
TIME CONSUMING TO COMPLY WITH; IF WE FAIL TO COMPLY WITH THESE REQUIREMENTS, WE
COULD BE SUBJECT TO ADVERSE CONSEQUENCES AND PENALTIES.

         The testing, manufacturing, labeling, advertising, promotion, export
and marketing of our products are subject to extensive regulation by
governmental authorities in Europe, the United States, and elsewhere throughout
the world.

         In general, submission of materials requesting permission to conduct
clinical trials may not result in authorization by the FDA or any equivalent
foreign regulatory agency to commence clinical trials. In addition, submission
of an application for marketing approval to the relevant regulatory agency
following completion of clinical trials may not result in the regulatory agency
approving the application if applicable regulatory criteria are not satisfied,
and may result in the regulatory agency requiring additional testing or
information.

         Any regulatory approval of a product may contain limitations on the
indicated uses for which the product may be marketed or requirements for costly
post-marketing testing and surveillance to monitor the safety or efficacy of the
product. Any product for which we obtain marketing approval, along with the
facilities at which the product is manufactured, any post-approval clinical data
and any advertising and promotional activities for the product will be subject
to continual review and periodic inspections by the FDA and other regulatory
agencies.

         Both before and after approval is obtained, violations of regulatory
requirements may result in:

         o    the regulatory agency's delay in approving, or refusal to
              approve, an application for approval of a product;

         o    restrictions on such products or the manufacturing of such
              products;

         o    withdrawal of the products from the market;

         o    warning letters;

         o    voluntary or mandatory recall;



         o    fines;

         o    suspension or withdrawal of regulatory approvals;

         o    product seizure;

         o    refusal to permit the import or export of our products;

         o    injunctions or the imposition of civil penalties; and

         o    criminal penalties.

WE HAVE ONLY LIMITED EXPERIENCE IN REGULATORY AFFAIRS AND OUR PRODUCTS ARE BASED
ON NEW TECHNOLOGIES; THESE FACTORS MAY AFFECT OUR ABILITY OR THE TIME WE REQUIRE
TO OBTAIN NECESSARY REGULATORY APPROVALS.

         We have only limited experience in filing the applications necessary to
gain regulatory approvals. Moreover, the products that result from our research
and development programs will likely be based on new technologies and new
therapeutic approaches that have not been extensively tested in humans. The
regulatory requirements governing these types of products may be more rigorous
than for conventional drugs. As a result, we may experience a longer regulatory
process in connection with obtaining regulatory approvals of any product that we
develop.

                         RISKS RELATING TO COLLABORATORS

WE NEED TO ESTABLISH COLLABORATIVE RELATIONSHIPS IN ORDER TO SUCCEED.

         An important element of our business strategy includes entering into
collaborative relationships for the development and commercialization of
products based on our discoveries. We face significant competition in seeking
appropriate collaborators. Moreover, these arrangements are complex to negotiate
and time-consuming to document. We may not be successful in our efforts to
establish collaborative relationships or other alternative arrangements.

         The success of collaboration arrangements will depend heavily on the
efforts and activities of our collaborators. Our collaborators will have
significant discretion in determining the efforts and resources that they will
apply to these collaborations. The risks that we face in connection with these
collaborations include the following:

         o    disputes may arise in the future with respect to the ownership
              of rights to technology developed with collaborators;

         o    disagreements with collaborators could delay or terminate the
              research, development or commercialization of products, or
              result in litigation or arbitration;

         o    we may have difficulty enforcing the contracts if one of our
              collaborators fails to perform;

         o    our collaborators may terminate their collaborations with us,
              which could make it difficult for us to attract new
              collaborators or adversely affect the perception of us in the
              business or financial communities;

         o    collaborators have considerable discretion in electing whether
              to pursue the development of any additional drugs and may
              pursue technologies or products either on their own or in
              collaboration with our competitors that are similar to or
              competitive with our technologies or products that are the
              subject of the collaboration with us; and

         o    our collaborators may change the focus of their development
              and commercialization efforts. Pharmaceutical and
              biotechnology companies historically have re-evaluated their
              priorities following mergers and consolidations, which have
              been common in recent years in these industries. The ability
              of our products to reach their potential could be limited if
              our collaborators decrease or fail to increase spending
              relating to such products.



         Given these risks, it is possible that any collaborative arrangements
into which we enter may not be successful. Previous collaborative arrangements
to which we were a party with F. Hoffmann-La Roche and G.D. Searle & Co. both
were terminated prior to the development of any product. The failure of any of
our collaborative relationships could delay our drug development or impair
commercialization of our products.

                     RISKS RELATING TO INTELLECTUAL PROPERTY

IF WE ARE UNABLE TO OBTAIN PATENT PROTECTION FOR OUR DISCOVERIES, THE VALUE OF
OUR TECHNOLOGY AND PRODUCTS WILL BE ADVERSELY AFFECTED.

         Our patent positions, and those of other drug discovery companies, are
generally uncertain and involve complex legal, scientific and factual questions.

         Our ability to develop and commercialize drugs depends in significant
part on our ability to:

         o    obtain patents;

         o    obtain licenses to the proprietary rights of others on
              commercially reasonable terms;

         o    operate without infringing upon the proprietary rights of
              others;

         o    prevent others from infringing on our proprietary rights; and

         o    protect trade secrets.

         We do not know whether any of our patent applications or those patent
applications which we license will result in the issuance of any patents. Our
issued patents and those that may issue in the future, or those licensed to us,
may be challenged, invalidated or circumvented, and the rights granted
thereunder may not provide us proprietary protection or competitive advantages
against competitors with similar technology. Furthermore, our competitors may
independently develop similar technologies or duplicate any technology developed
by us. Because of the extensive time required for development, testing and
regulatory review of a potential product, it is possible that, before any of our
products can be commercialized, any related patent may expire or remain in force
for only a short period following commercialization, thus reducing any advantage
of the patent.

         Because patent applications in the United States and many foreign
jurisdictions are typically not published until 18 months after filing, or in
some cases not at all, and because publications of discoveries in the scientific
literature often lag behind actual discoveries, neither we nor our licensors can
be certain that we or they were the first to make the inventions claimed in
issued patents or pending patent applications, or that we or they were the first
to file for protection of the inventions set forth in these patent applications.

THIRD PARTIES MAY OWN OR CONTROL PATENTS OR PATENT APPLICATIONS AND REQUIRE US
TO SEEK LICENSES, WHICH COULD INCREASE OUR DEVELOPMENT AND COMMERCIALIZATION
COSTS, OR PREVENT US FROM DEVELOPING OR MARKETING PRODUCTS.

         We may not have rights under some patents or patent applications
related to our products. Third parties may own or control these patents and
patent applications in the United States and abroad. Therefore, in some cases,
to develop, manufacture, sell or import some of our products, we or our
collaborators may choose to seek, or be required to seek, licenses under third
party patents issued in the United States and abroad or under patents that might
issue from United States and foreign patent applications. In such event, we
would be required to pay license fees or royalties or both to the licensor. If
licenses are not available to us on acceptable terms, we or our collaborators
may not be able to develop, manufacture, sell or import these products.

WE MAY LOSE OUR RIGHTS TO PATENTS, PATENT APPLICATIONS OR TECHNOLOGIES OF THIRD
PARTIES IF OUR LICENSES FROM THESE THIRD PARTIES ARE TERMINATED. IN SUCH EVENT,
WE MIGHT NOT BE ABLE TO DEVELOP OR COMMERCIALIZE PRODUCTS COVERED BY THE
LICENSES.

         We are party to 12 royalty-bearing license agreements under which we
have acquired rights to patents, patent applications and technology of third
parties. Under these licenses we are obligated to pay royalties on net




sales by us of products or processes covered by a valid claim of a patent or
patent application licensed to us. We also are required in some cases to pay a
specified percentage of any sublicense income that we may receive. These
licenses impose various commercialization, sublicensing, insurance and other
obligations on us. Our failure to comply with these requirements could result in
termination of the licenses. These licenses generally will otherwise remain in
effect until the expiration of all valid claims of the patents covered by such
licenses or upon earlier termination by the parties. The issued patents covered
by these licenses expire at various dates ranging from 2006 to 2021. If one or
more of these licenses is terminated, we may be delayed in our efforts, or be
unable, to develop and market the products that are covered by the applicable
license or licenses.

WE MAY BECOME INVOLVED IN EXPENSIVE PATENT LITIGATION OR OTHER PROCEEDINGS,
WHICH COULD RESULT IN OUR INCURRING SUBSTANTIAL COSTS AND EXPENSES OR
SUBSTANTIAL LIABILITY FOR DAMAGES OR REQUIRE US TO STOP OUR DEVELOPMENT AND
COMMERCIALIZATION EFFORTS.

         There has been substantial litigation and other proceedings regarding
patent and other intellectual property rights in the biotechnology industry. We
may become a party to various types of patent litigation or other proceedings
regarding intellectual property rights from time to time even under
circumstances where we are not practicing and do not intend to practice any of
the intellectual property involved in the proceedings. For instance, in 2002, we
became involved in an interference declared by the United States Patent and
Trademark Office involving a patent application exclusively licensed by us from
University of Massachusetts Medical Center, or UMMC, and three patents issued to
the National Institutes of Health. In addition, in 2003, we became involved in
an interference declared by the United States Patent and Trademark Office
involving another patent exclusively licensed to us from UMMC and a patent
application assigned jointly to the University of Montreal and The Massachusetts
Institute of Technology.

         The cost to us of any patent litigation or other proceeding, including
the interferences referred to above, even if resolved in our favor, could be
substantial. Some of our competitors may be able to sustain the cost of such
litigation or proceedings more effectively than we can because of their
substantially greater financial resources. If any patent litigation or other
proceeding is resolved against us, we or our collaborators may be enjoined from
developing, manufacturing, selling or importing our drugs without a license from
the other party and we may be held liable for significant damages. We may not be
able to obtain any required license on commercially acceptable terms or at all.

         Uncertainties resulting from the initiation and continuation of patent
litigation or other proceedings could have a material adverse effect on our
ability to compete in the marketplace. Patent litigation and other proceedings
may also absorb significant management time.

        RISKS RELATING TO PRODUCT MANUFACTURING, MARKETING AND SALES AND
                           RELIANCE ON THIRD PARTIES

BECAUSE WE HAVE LIMITED MANUFACTURING EXPERIENCE, WE ARE DEPENDENT ON
THIRD-PARTY MANUFACTURERS TO MANUFACTURE PRODUCTS FOR US. IF WE CANNOT RELY ON
THIRD-PARTY MANUFACTURERS, WE WILL BE REQUIRED TO INCUR SIGNIFICANT COSTS AND
DEVOTE SIGNIFICANT EFFORTS TO ESTABLISH OUR OWN MANUFACTURING FACILITIES AND
CAPABILITIES.

         We have limited manufacturing experience and no commercial scale
manufacturing capabilities. In order to continue to develop our products, apply
for regulatory approvals and ultimately commercialize products, we need to
develop, contract for or otherwise arrange for the necessary manufacturing
capabilities.

         We currently rely upon third parties to produce material for
preclinical and clinical testing purposes and expect to continue to do so in the
future. We also expect to rely upon third parties to produce materials that may
be required for the commercial production of our products.

         There are a limited number of manufacturers that operate under the
FDA's current good manufacturing practices regulations capable of manufacturing
our products. As a result, we may have difficulty finding manufacturers for our
products with adequate capacity for our needs. If we are unable to arrange for
third party manufacturing of our products on a timely basis, or to do so on
commercially reasonable terms, we may not be able to complete development of our
products or market them.


         Reliance on third party manufacturers entails risks to which we would
not be subject if we manufactured products ourselves, including:

         o    reliance on the third party for regulatory compliance and
              quality assurance,

         o    the possibility of breach of the manufacturing agreement by
              the third party because of factors beyond our control,

         o    the possibility of termination or nonrenewal of the agreement
              by the third party, based on its own business priorities, at a
              time that is costly or inconvenient for us,

         o    the potential that third party manufacturers will develop
              know-how owned by such third party in connection with the
              production of our products that is necessary for the
              manufacture of our products, and

         o    reliance upon third party manufacturers to assist us in
              preventing inadvertent disclosure or theft of our proprietary
              knowledge.

         Between September 2000 and March 2004, we purchased oligonucleotides
for preclinical and clinical testing from Avecia Biotechnology. In March 2004,
our manufacturing agreement with Avecia expired. We are seeking to renew our
manufacturing agreement with Avecia. If we are unable to renew this agreement on
satisfactory terms or on a timely basis, we may need to seek a new contract
manufacturer. If we are unable to enter into a new manufacturing arrangement
with Avecia or a new contract manufacturer on a timely basis or at all, our
ability to supply the product needed for our clinical trials could be materially
impaired.

WE HAVE NO EXPERIENCE SELLING, MARKETING OR DISTRIBUTING PRODUCTS AND NO
INTERNAL CAPABILITY TO DO SO.

         If we receive regulatory approval to commence commercial sales of any
of our products, we will face competition with respect to commercial sales,
marketing and distribution. These are areas in which we have no experience. To
market any of our products directly, we would need to develop a marketing and
sales force with technical expertise and with supporting distribution
capability. In particular, we would need to recruit a large number of
experienced marketing and sales personnel. Alternatively, we could engage a
pharmaceutical or other healthcare company with an existing distribution system
and direct sales force to assist us. However, to the extent we entered into such
arrangements, we would be dependent on the efforts of third parties. If we are
unable to establish sales and distribution capabilities, whether internally or
in reliance on third parties, our business would suffer materially.

IF THIRD PARTIES ON WHOM WE RELY FOR CLINICAL TRIALS DO NOT PERFORM AS
CONTRACTUALLY REQUIRED OR AS WE EXPECT, WE MAY NOT BE ABLE TO OBTAIN REGULATORY
APPROVAL FOR OR COMMERCIALIZE OUR PRODUCTS, AND OUR BUSINESS MAY SUFFER.

         We do not have the ability to independently conduct the clinical trials
required to obtain regulatory approval for our products. We depend on
independent clinical investigators, contract research organizations and other
third party service providers in the conduct of the clinical trials of our
products and expect to continue to do so. We rely heavily on these parties for
successful execution of our clinical trials, but do not control many aspects of
their activities. We are responsible for ensuring that each of our clinical
trials is conducted in accordance with the general investigational plan and
protocols for the trial. Moreover, the FDA requires us to comply with standards,
commonly referred to as good clinical practices, for conducting, recording and
reporting clinical trials to assure that data and reported results are credible
and accurate and that the rights, integrity and confidentiality of trial
participants are protected. Our reliance on third parties that we do not control
does not relieve us of these responsibilities and requirements. Third parties
may not complete activities on schedule or may not conduct our clinical trials
in accordance with regulatory requirements or our stated protocols. The failure
of these third parties to carry out their obligations could delay or prevent the
development, approval and commercialization of our products. If we seek to
conduct any of these activities ourselves in the future, we will need to recruit
appropriately trained personnel and add to our infrastructure.


IF WE ARE UNABLE TO OBTAIN ADEQUATE REIMBURSEMENT FROM THIRD PARTY PAYORS FOR
ANY PRODUCTS THAT WE MAY DEVELOP OR ACCEPTABLE PRICES FOR THOSE PRODUCTS, OUR
REVENUES AND PROSPECTS FOR PROFITABILITY WILL SUFFER.

         Most patients will rely on Medicare and Medicaid, private health
insurers and other third party payors to pay for their medical needs, including
any drugs we may market. If third party payors do not provide adequate coverage
or reimbursement for any products that we may develop, our revenues and
prospects for profitability will suffer. The Congress recently enacted a limited
prescription drug benefit for Medicare recipients in the Medicare Prescription
Drug and Modernization Act of 2003. While the program established by this
statute may increase demand for our products, if we participate in this program,
our prices will be negotiated with drug procurement organizations for Medicare
beneficiaries and are likely to be lower than we might otherwise obtain.
Non-Medicare third party drug procurement organizations may also base the price
they are willing to pay on the rate paid by drug procurement organizations for
Medicare beneficiaries.

         A primary trend in the United States healthcare industry is toward cost
containment. In addition, in some foreign countries, particularly the countries
of the European Union, the pricing of prescription pharmaceuticals is subject to
governmental control. In these countries, pricing negotiations with governmental
authorities can take six to 12 months or longer after the receipt of regulatory
marketing approval for a product. To obtain reimbursement or pricing approval in
some countries, we may be required to conduct a clinical trial that compares the
cost effectiveness of our product candidates or products to other available
therapies. The conduct of such a clinical trial could be expensive and result in
delays in commercialization of our products.

         Third party payors are challenging the prices charged for medical
products and services, and many third party payors limit reimbursement for
newly-approved healthcare products. In particular, third party payors may limit
the indications for which they will reimburse patients who use any products that
we may develop. Cost control initiatives could decrease the price we might
establish for products that we may develop, which would result in lower product
revenues to us.

WE FACE A RISK OF PRODUCT LIABILITY CLAIMS AND MAY NOT BE ABLE TO OBTAIN
INSURANCE.

         Our business exposes us to the risk of product liability claims that is
inherent in the manufacturing, testing and marketing of human therapeutic drugs.
Although we have product liability and clinical trial liability insurance that
we believe is adequate, this insurance is subject to deductibles and coverage
limitations. We may not be able to obtain or maintain adequate protection
against potential liabilities. If we are unable to obtain insurance at
acceptable cost or otherwise protect against potential product liability claims,
we will be exposed to significant liabilities, which may materially and
adversely affect our business and financial position. These liabilities could
prevent or interfere with our commercialization efforts.

               RISKS RELATING TO AN INVESTMENT IN OUR COMMON STOCK

OUR CORPORATE GOVERNANCE STRUCTURE, INCLUDING PROVISIONS IN OUR CERTIFICATE OF
INCORPORATION AND BY-LAWS, OUR STOCKHOLDER RIGHTS PLAN AND DELAWARE LAW, MAY
PREVENT A CHANGE IN CONTROL OR MANAGEMENT THAT STOCKHOLDERS MAY CONSIDER
DESIRABLE.

         Section 203 of the Delaware General Corporation Law and our certificate
of incorporation, by-laws and stockholder rights plan contain provisions that
might enable our management to resist a takeover of our company or discourage a
third party from attempting to take over our company. These provisions include:

         o    a classified board of directors,

         o    limitations on the removal of directors,

         o    limitations on stockholder proposals at meetings of
              stockholders,

         o    the inability of stockholders to act by written consent or to
              call special meetings, and

         o    the ability of our board of directors to designate the terms
              of and issue new series of preferred stock without stockholder
              approval.


         These provisions could have the effect of delaying, deferring, or
preventing a change in control of us or a change in our management that
stockholders may consider favorable or beneficial. These provisions could also
discourage proxy contests and make it more difficult for you and other
stockholders to elect directors and take other corporate actions. These
provisions could also limit the price that investors might be willing to pay in
the future for shares of our common stock.

OUR STOCK PRICE HAS BEEN AND MAY IN THE FUTURE BE EXTREMELY VOLATILE. IN
ADDITION, BECAUSE AN ACTIVE TRADING MARKET FOR OUR COMMON STOCK HAS NOT
DEVELOPED, OUR INVESTORS' ABILITY TO TRADE OUR COMMON STOCK MAY BE LIMITED. AS A
RESULT, INVESTORS MAY LOSE ALL OR A SIGNIFICANT PORTION OF THEIR INVESTMENT.

         Our stock price has been volatile. During the period from January 1,
2002 to April 1, 2004, the closing sale price of our common stock ranged from a
high of $1.85 per share to a low of $0.60 per share. The stock market has also
experienced significant price and volume fluctuations, and the market prices of
biotechnology companies in particular have been highly volatile, often for
reasons that have been unrelated to the operating performance of particular
companies. The market price for our common stock may be influenced by many
factors, including:

         o    results of clinical trials of our product candidates or those
              of our competitors;

         o    the regulatory status of our product candidates;

         o    failure of any of our product candidates, if approved, to
              achieve commercial success;

         o    the success of competitive products or technologies;

         o    regulatory developments in the United States and foreign
              countries;

         o    developments or disputes concerning patents or other
              proprietary rights;

         o    the departure of key personnel;

         o    variations in our financial results or those of companies that
              are perceived to be similar to us;

         o    changes in the structure of healthcare payment systems;

         o    market conditions in the pharmaceutical and biotechnology
              sectors and issuance of new or changed securities analysts'
              reports or recommendations; and

         o    general economic, industry and market conditions.

         In addition, our common stock has historically been traded at low
volume levels and may continue to trade at low volume levels. As a result, any
large purchase or sale of our common stock could have a significant impact on
the price of our common stock and it may be difficult for investors to sell our
common stock in the market without depressing the market price for the common
stock or at all.

         As a result of the foregoing, investors may not be able to resell their
shares at or above the price they paid for such shares. Investors in our common
stock must be willing to bear the risk of fluctuations in the price of our
common stock and the risk that the value of their investment in our stock could
decline.







ITEM 7:    FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

 1.1     Placement Agency Agreement, dated April 15, 2004, by and among the
         Company, Thomas Weisel Partners LLC, Rodman & Renshaw and Merriman
         Curham Ford & Co., including as Exhibit B thereto the form of Purchase
         Agreement to be entered into by the Company and the investors.

 4.1     Form of Warrant.

 5.1     Opinion of Hale and Dorr LLP.

23.1     Consent of Hale and Dorr LLP (included in Exhibit 5.1).







                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


Date: April 15, 2004                      HYBRIDON, INC.


                                          /s/ Robert G. Andersen
                                          --------------------------------
                                          Robert G. Andersen
                                          Chief Financial Officer and
                                          Vice President of Operations





                                  EXHIBIT INDEX


Exhibit No.       Description
-----------       -----------

    1.1           Placement Agency Agreement, dated April 15, 2004, by and among
                  the Company, Thomas Weisel Partners LLC, Rodman & Renshaw and
                  Merriman Curham Ford & Co., including as Exhibit B thereto the
                  form of purchase agreement to be entered into by the Company
                  and the investors.

    4.1           Form of Warrant.

    5.1           Opinion of Hale and Dorr LLP.

   23.1           Consent of Hale and Dorr LLP (included in Exhibit 5.1).