HYBRIDON INC
DEF 14A, 1997-04-24
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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<PAGE>   1
 
                            SCHEDULE 14A INFORMATION
 
          PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
                  EXCHANGE ACT OF 1934 (AMENDMENT NO.       )
 
FILED BY THE REGISTRANT [X]       FILED BY A PARTY OTHER THAN THE REGISTRANT [ ]
 
- --------------------------------------------------------------------------------
 
Check the appropriate box:
[ ] Preliminary Proxy Statement
[ ] Definitive Proxy Statement
[X] Definitive Additional Materials
[ ] Soliciting Material Pursuant to sec.240.14a-11(c) or sec.240.14a-12
[ ] Confidential, for Use of the Commission Only (as permitted by Rule
    14a-6(e)(2))
 
                                 Hybridon, Inc.
                (Name of Registrant as Specified In Its Charter)

                   (Name of Person(s) Filing Proxy Statement)
 
PAYMENT OF FILING FEE (CHECK THE APPROPRIATE BOX):
[X] No fee required.
[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.
 
   1) Title of each class of securities to which transaction applies:
 
   2) Aggregate number of securities to which transaction applies:
 
   3) Per unit price or other underlying value of transaction computed pursuant
      to Exchange Act Rule 0-11 (Set forth the amount on which the filing fee is
      calculated and state how it was determined):
 
   4) Proposed maximum aggregate value of transaction:
 
   5) Total fee paid:
 
[ ] Fee paid previously with preliminary materials.
 
[ ] Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.
 
   1) Amount Previously Paid:
 
   2) Form, Schedule or Registration Statement No.:
 
   3) Filing Party:
 
   4) Date Filed:
 
- --------------------------------------------------------------------------------
<PAGE>   2
 
                                 HYBRIDON, INC.
 
                    NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
                            TO BE HELD MAY 19, 1997
 
     NOTICE IS HEREBY GIVEN that the Annual Meeting of the Stockholders of
Hybridon, Inc., a Delaware corporation (the "Company"), will be held on Monday,
May 19, 1997 at 2:00 p.m. at the Company, 620 Memorial Drive, Cambridge,
Massachusetts (the "Meeting") for the purpose of considering and voting upon the
following matters:
 
     1.  To elect four Class II Directors for the ensuing three years;
 
     2.  To approve the adoption of the Hybridon, Inc. 1997 Stock Incentive
         Plan, as more fully described in the accompanying Proxy Statement;
 
     3.  To ratify the selection of Arthur Andersen LLP as independent auditors
         of the Company for the current year; and
 
     4.  To transact such other business as may properly come before the Meeting
         or any adjournment thereof.
 
     The Board of Directors has no knowledge of any other business to be
transacted at the Meeting.
 
     The Board of Directors has fixed the close of business on Friday, April 4,
1997 as the record date for the determination of stockholders entitled to notice
of and to vote at the Meeting and at any adjournments thereof.
 
     A copy of the Company's Annual Report to Stockholders for the year ended
December 31, 1996, which contains consolidated financial statements and other
information of interest to stockholders, accompanies this Notice and the
enclosed Proxy Statement.
 
                                            By order of the Board of Directors,
 
                                            ANTHONY J. PAYNE, Secretary
 
April 21, 1997
 
WHETHER OR NOT YOU PLAN TO ATTEND THE MEETING, PLEASE PROMPTLY COMPLETE, DATE,
SIGN AND RETURN THE ENCLOSED PROXY IN THE ACCOMPANYING ENVELOPE. NO POSTAGE NEED
BE AFFIXED IF THE PROXY IS MAILED IN THE UNITED STATES.
<PAGE>   3
 
                                 HYBRIDON, INC.
                               620 MEMORIAL DRIVE
                         CAMBRIDGE, MASSACHUSETTS 02139
 
                                PROXY STATEMENT
 
                       FOR ANNUAL MEETING OF STOCKHOLDERS
                            TO BE HELD MAY 19, 1997
 
     This Proxy Statement is furnished in connection with the solicitation of
proxies by the Board of Directors of Hybridon, Inc. (the "Company") at the
Annual Meeting of Stockholders to be held on Monday, May 19, 1997 at 2:00 p.m.
at the Company, 620 Memorial Drive, Cambridge, Massachusetts and at any
adjournments thereof (the "Meeting").
 
     All proxies will be voted in accordance with the instructions of the
stockholder. If no choice is specified, the proxies will be voted in favor of
the matters set forth in the accompanying Notice of Meeting. Any proxy may be
revoked by a stockholder at any time before its exercise by delivery of a
written revocation or a subsequently dated proxy to the Secretary of the Company
or by voting in person at the Meeting. Attendance at the Meeting will not itself
be deemed to revoke a Proxy unless the stockholder gives affirmative notice at
the Meeting that the stockholder intends to revoke the Proxy and vote in person.
 
     On April 4, 1997, the record date for determination of stockholders
entitled to vote at the Meeting, there were outstanding and entitled to vote an
aggregate of 25,246,002 shares of Common Stock of the Company, $.001 par value
per share (the "Common Stock"). Each share entitles the record holder to one
vote on each of the matters to be voted upon at the Meeting.
 
     THE NOTICE OF MEETING, THIS PROXY STATEMENT, THE ENCLOSED PROXY AND THE
COMPANY'S ANNUAL REPORT TO STOCKHOLDERS FOR THE YEAR ENDED DECEMBER 31, 1996 ARE
BEING MAILED TO STOCKHOLDERS ON OR ABOUT APRIL 21, 1997. THE COMPANY WILL, UPON
WRITTEN REQUEST OF ANY STOCKHOLDER, FURNISH WITHOUT CHARGE A COPY OF ITS ANNUAL
REPORT ON FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 1996, AS FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION, WITHOUT EXHIBITS. PLEASE ADDRESS ALL SUCH
REQUESTS TO THE COMPANY, ATTENTION OF DOUGLAS J. JENSEN, VICE PRESIDENT OF
CORPORATE ADMINISTRATION AND DEVELOPMENT, 620 MEMORIAL DRIVE, CAMBRIDGE,
MASSACHUSETTS 02139. EXHIBITS WILL BE PROVIDED UPON WRITTEN REQUEST AND PAYMENT
OF AN APPROPRIATE PROCESSING FEE.
<PAGE>   4
 
SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
 
     The following table sets forth certain information as of February 28, 1997
with respect to the beneficial ownership of shares of Common Stock by (i) each
person known to the Company to own beneficially more than 5% of the outstanding
shares of Common Stock, (ii) the directors and director nominees of the Company,
(iii) the Chief Executive Officer and the other executive officers listed in the
Summary Compensation Table below (the "Named Executive Officers"), and (iv) the
directors and executive officers of the Company as a group.
 
<TABLE>
<CAPTION>
                                                                            AMOUNT AND NATURE
                                                                              OF BENEFICIAL
                                                                              OWNERSHIP(1)
                                                                        -------------------------
                                                                        NUMBER OF      PERCENT OF
                 NAME AND ADDRESS OF BENEFICIAL OWNER                    SHARES          CLASS
- ----------------------------------------------------------------------  ---------      ----------
<S>                                                                     <C>            <C>
5% STOCKHOLDERS
Yahia M.A. Bin Laden..................................................  2,568,750(2)       9.94%
  2, rue Charles Bonnet
  1206 Geneva, Switzerland
Morgan Grenfell International Funds Management Limited................  2,441,026(3)       9.70%
  c/o The Royal Bank of Scotland PLC
  London, England
Nicris Limited........................................................  2,066,667(4)       8.05%
  2, rue Charles Bonnet
  1206 Geneva, Switzerland
HTI Investments, N.V..................................................  1,833,335(5)       7.25%
  c/o Healthcare Technologies International, Ltd.
  P.O. Box 42124
  Jeddah, 21541
  Saudi Arabia
Youssef El-Zein.......................................................  1,488,945(6)       5.60%
  c/o Pillar S.A
  28, Avenue de Messine
  75008 Paris, France
F. Hoffmann-La Roche Ltd..............................................  1,370,114(7)       5.33%
  Postfach
  CH 4002 Basel
  Switzerland
OTHER DIRECTORS
 
Nasser Menhall........................................................  1,315,175(8)       4.99%
E. Andrews Grinstead, III.............................................  1,110,460(9)       4.26%
Mohamed A. El-Khereiji................................................    894,666(10)      3.49%
Paul C. Zamecnik......................................................    500,100(11)      1.98%
Sudhir Agrawal........................................................    443,800(12)      1.74%
James B. Wyngaarden...................................................     55,000(13)         *
Jerry A. Weisbach.....................................................     35,000(14)         *
J. Robert Buchanan....................................................     20,000(15)         *
OTHER EXECUTIVE OFFICERS
 
Anthony J. Payne......................................................    361,116(16)      1.42%
Paul J. Schechter.....................................................    106,000(17)         *
All directors and executive officers as a group (10 persons)..........  5,655,014(18)     19.37%
</TABLE>
 
                                        2
<PAGE>   5
 
- ---------------
 
  * Less than 1%
 
 (1) The number of shares beneficially owned by each director and executive
     officer is determined under rules promulgated by the Securities and
     Exchange Commission, and the information is not necessarily indicative of
     beneficial ownership for any other purpose. Under such rules, beneficial
     ownership includes any shares as to which the individual has sole or shared
     voting power or investment power and also any shares which the individual
     has the right to acquire within 60 days after February 28, 1997 through the
     exercise of any stock option or other right. The inclusion herein of such
     shares, however, does not constitute an admission that the named
     stockholder is a direct or indirect beneficial owner of such shares. Unless
     otherwise indicated, each person or entity named in the table has sole
     voting power and investment power (or shares such power with his or her
     spouse) with respect to all shares of capital stock listed as owned by such
     person or entity.
 
 (2) Includes (a) 164,583 shares issuable upon the exercise of warrants held by
     Mr. Bin Laden, (b) 1,550,000 shares held by Nicris Limited ("Nicris"), and
     (c) 516,667 shares issuable upon the exercise of warrants held by Nicris.
     Mr. Bin Laden, a controlling stockholder of Nicris, may be considered a
     beneficial owner of the shares beneficially owned by such entity.
 
 (3) Share ownership based on Schedule 13D filed with the Commission on
     September 6, 1996.
 
 (4) Includes 516,667 shares issuable upon the exercise of warrants held by
     Nicris.
 
 (5) Includes 125,000 shares issuable upon the exercise of warrants held by HTI
     Investments, N.V.
 
 (6) Includes (a) 780,697 shares issuable upon the exercise of warrants held by
     Mr. El-Zein, (b) 284,416 shares issuable upon the exercise of warrants held
     by Pillar Limited, (c) 64,000 shares held by Pillar Investment, (d) 1,832
     shares issuable upon the exercise of warrants held by Pillar Investment,
     and (e) 325,000 shares issuable upon the exercise of warrants held by
     Pillar S.A. Also includes 25,000 shares subject to outstanding stock
     options held by Mr. El-Zein which are exercisable within the 60-day period
     following February 28, 1997. Mr. El-Zein, an affiliate of Pillar
     Investment, Pillar Limited and Pillar S.A., may be considered a beneficial
     owner of the shares beneficially owned by such entities.
 
 (7) Includes 551,724 shares issuable upon the exercise of a warrant.
 
 (8) Includes (a) 565,956 shares issuable upon the exercise of warrants held by
     Mr. Menhall, (b) 284,416 shares issuable upon the exercise of warrants held
     by Pillar Limited, (c) 64,000 shares held by Pillar Investment, (d) 1,832
     shares issuable upon the exercise of warrants held by Pillar Investment,
     (e) 38,521 shares held by Biomedical Associates, (f) 10,450 shares issuable
     upon the exercise of warrants held by Biomedical Associates, and (g)
     325,000 shares issuable upon the exercise of warrants held by Pillar S.A.
     Also includes 25,000 shares subject to outstanding stock options held by
     Mr. Menhall which are exercisable within the 60-day period following
     February 28, 1997. Mr. Menhall, an affiliate of Pillar Limited, Pillar
     Investment, Biomedical Associates and Pillar S.A., may be considered a
     beneficial owner of the shares beneficially owned by such entities.
 
 (9) Includes 892,564 shares subject to outstanding stock options which are
     exercisable within the 60-day period following February 28, 1997.
 
(10) Includes (a) 420,300 shares issuable upon the exercise of warrants held by
     Mr. El-Khereiji and (b) 20,000 shares subject to outstanding stock options
     held by Mr. El-Khereiji which are exercisable within the 60-day period
     following February 28, 1997. Also includes 454,366 shares beneficially
     owned by Solter Corporation. Mr. El-Khereiji, an affiliate of Solter
     Corporation, may be considered a beneficial owner of the shares
     beneficially owned by such entity.
 
                                        3
<PAGE>   6
 
(11) Includes 85,000 shares subject to outstanding stock options which are
     exercisable within the 60-day period following February 28, 1997.
 
(12) Includes 370,000 shares subject to outstanding stock options which are
     exercisable within the 60-day period following February 28, 1997.
 
(13) Includes 3,000 shares held by Dr. Wyngaarden's children and 35,000 shares
     subject to outstanding stock options which are exercisable within the
     60-day period following February 28, 1997.
 
(14) Consists of 35,000 shares subject to outstanding stock options which are
     exercisable within the 60-day period following February 28, 1997.
 
(15) Consists of 20,000 shares subject to outstanding stock options which are
     exercisable within the 60-day period following February 28, 1997.
 
(16) Includes 321,642 shares subject to outstanding stock options which are
     exercisable within the 60-day period following February 28, 1997.
 
(17) Consists of 106,000 shares subject to outstanding stock options which are
     exercisable within the 60-day period following February 28, 1997. Dr.
     Schechter's employment with the Company terminated as of February 28, 1997.
 
(18) Includes an aggregate of 2,388,651 shares issuable upon the exercise of
     outstanding warrants exercisable within the 60-day period following
     February 28, 1997 and an aggregate of 1,935,206 shares issuable upon the
     exercise of outstanding stock options exercisable within the 60-day period
     following February 28, 1997. Does not include 577,479 shares issuable upon
     the exercise of outstanding stock options not exercisable within the 60-day
     period following February 28, 1997.
 
SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE
 
     Section 16(a) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), requires the Company's directors, executive officers and
holders of more than 10% of the Company's Common Stock to file with the
Securities and Exchange Commission initial reports of ownership and reports of
changes in ownership of Common Stock and other equity securities of the Company.
Such persons are required by Commission regulations to furnish the Company with
copies of all Section 16(a) forms filed by such person with respect to the
Company.
 
     Based solely on its review of copies of reports filed by reporting persons
pursuant to Section 16(a) of the Exchange Act, or written representations from
reporting persons that no Form 5 filing was required for such person, the
Company believes that, during 1996, all filings required to be made by reporting
persons of the Company were timely made in accordance with the requirements of
the Exchange Act, other than (i) filings of Forms 4 by Pillar Investment Limited
and Messrs. El-Khereiji, El-Zein and Menhall with respect to warrant transfer
transactions and (ii) a filing of a Form 5 by Dr. Wyngaarden with respect to a
stock option grant, which filings were not made on a timely basis.
 
VOTES REQUIRED
 
     The holders of a majority of the shares of Common Stock issued and
outstanding and entitled to vote at the Meeting shall constitute a quorum for
the transaction of business at the Meeting. Shares of Common Stock present in
person or represented by proxy (including shares which abstain or do not vote
with respect to one or more of the matters presented for stockholder approval)
will be counted for purposes of determining whether a quorum exists at the
Meeting.
 
                                        4
<PAGE>   7
 
     The affirmative vote of the holders of a plurality of the votes cast by the
stockholders entitled to vote at the Meeting is required for the election of
directors. The affirmative vote of the holders of a majority of the shares of
Common Stock present or represented by proxy and voting on the matter is
required for the approval of the adoption of the Hybridon, Inc. 1997 Stock
Incentive Plan (the "1997 Plan") and the ratification of the selection of the
Company's independent auditors.
 
     Shares which abstain from voting as to a particular matter, and shares held
in "street name" by brokers or nominees who indicate on their proxies that they
do not have discretionary authority to vote such shares as to a particular
matter, will not be counted as votes in favor of such matter, and will also not
be counted as votes cast or shares voting on such matter. Accordingly,
abstentions and "broker non-votes" will have no effect on the voting on a matter
that requires the affirmative vote of a certain percentage of the votes cast or
shares voting on a matter.
 
                      PROPOSAL 1 -- ELECTION OF DIRECTORS
 
     The Company has a classified Board of Directors consisting of two Class I
Directors, four Class II Directors, and three Class III Directors. At each
annual meeting of stockholders, directors are elected for a full term of three
years to succeed those whose terms are expiring. The Class I Directors were
elected at the 1996 Annual Meeting for a three-year term expiring at the 1999
Annual Meeting of Stockholders; and the Class III Directors will be elected at
the 1998 Annual Meeting of Stockholders for a three-year term expiring at the
2001 Annual Meeting of Stockholders.
 
     The persons named in the enclosed proxy will vote to elect, as Class II
Directors, Mohamed A. El-Khereiji, Jerry A. Weisbach, James B. Wyngaarden and
Paul C. Zamecnik, the four director nominees named below, unless the proxy is
marked otherwise. Mr. El-Khereiji and Drs. Weisbach, Wyngaarden and Zamecnik are
currently directors of the Company.
 
     Each Class II director will be elected to hold office until the 2000 Annual
Meeting of Stockholders and until his successor is elected and qualified. Each
of the nominees has indicated his willingness to serve, if elected; however, if
any nominee should be unable to serve, the person acting under the proxy may
vote the proxy for a substitute nominee. The Board of Directors has no reason to
believe that any of the nominees will be unable to serve if elected.
 
     For each member of the Board of Directors, including those who are nominees
for election as Class II Directors, there follows information given by each
concerning his principal occupation and business experience for the past five
years, the names of other publicly held companies of which he serves as a
director and his age and length of service as a director of the Company.
 
<TABLE>
<CAPTION>
                                                             PRINCIPAL OCCUPATION, OTHER
                                         DIRECTOR          BUSINESS EXPERIENCE DURING PAST
              NAME                 AGE     SINCE         FIVE YEARS AND OTHER DIRECTORSHIPS
- ---------------------------------  ----  ---------  ---------------------------------------------
<S>                                <C>   <C>        <C>
NOMINEES FOR TERMS EXPIRING IN 2000 (CLASS II DIRECTORS)
Mohamed A. El-Khereiji...........   43     1993     Chairman of the International Centre for
                                                    Commerce and Contracting, a contracting and
                                                    trading company, since 1979; Chairman of
                                                    Faisal Investment E.C., a leasing company,
                                                    since 1989.
Jerry A. Weisbach, Ph.D..........   63     1993     Independent consultant to biotechnology and
                                                    pharmaceutical companies since 1994; Director
                                                    of Technology Transfer and Adjunct Professor
                                                    at The Rockefeller University from 1988 to
                                                    1994; Member of the Board of Directors of
                                                    CIMA Pharmaceuticals, Inc. and Neose
                                                    Technologies, Inc.
</TABLE>
 
                                        5
<PAGE>   8
 
<TABLE>
<CAPTION>
                                                             PRINCIPAL OCCUPATION, OTHER
                                         DIRECTOR          BUSINESS EXPERIENCE DURING PAST
              NAME                 AGE     SINCE         FIVE YEARS AND OTHER DIRECTORSHIPS
- ---------------------------------  ----  ---------  ---------------------------------------------
<S>                                <C>   <C>        <C>
James B. Wyngaarden, M.D.........   72     1990     Foreign Secretary of the National Academy of
                                                    Sciences and the Institute of Medicine of the
                                                    National Academy of Sciences from 1990 to
                                                    1994; Council member of the Human Genome
                                                    Organization from 1990 to 1993 and Director
                                                    from 1990 to 1991; Director of the National
                                                    Institutes of Health from 1982 to 1989;
                                                    Member of the Board of Directors of Human
                                                    Genome Sciences, Inc.; Elected Vice Chairman
                                                    of the Board of Directors of the Company in
                                                    February 1997.
Paul C. Zamecnik, M.D............   84     1990     Principal Scientist at the Worcester
                                                    Foundation for Biomedical Research, Inc. (the
                                                    "Worcester Foundation") and Collis P.
                                                    Huntington Professor of Oncologic Medicine
                                                    Emeritus at the Harvard Medical School since
                                                    1979.
 
DIRECTORS WHOSE TERMS EXPIRE IN 1999 (CLASS I DIRECTORS)
J. Robert Buchanan, M.D..........   68     1993     General Director of the Massachusetts General
                                                    Hospital and Professor of Medicine at Harvard
                                                    Medical School from 1982 to 1994; Member of
                                                    the Board of Directors of i-STAT Corporation.
Nasser Menhall...................   40     1992     Member of the Board of Directors and Chief
                                                    Executive Officer of the Wellcare Group, a
                                                    teleradiology company, since 1993; President
                                                    of Pillar Limited, a private investment and
                                                    management consulting firm, since 1990;
                                                    President of Biomedical Associates, a private
                                                    investment firm, since 1990.
 
DIRECTORS WHOSE TERMS EXPIRE IN 1998 (CLASS III DIRECTORS)
Sudhir Agrawal, D.Phil...........   43     1993     Senior Vice President of Discovery of the
                                                    Company since March 1994; Chief Scientific
                                                    Officer of the Company since January 1993;
                                                    Vice President of Discovery of the Company
                                                    from December 1991 to January 1993; Principal
                                                    Research Scientist of the Company from
                                                    February 1990 to January 1993.
Youssef El-Zein..................   48     1992     Executive Officer of Pillar S.A., a private
                                                    investment and management consulting firm,
                                                    since 1991; Chairman of the Wellcare Group
                                                    since 1993; Member of the Board of Directors
                                                    of Pillar Investment Limited, a private
                                                    investment and management consulting firm,
                                                    since 1991; Elected Vice Chairman of the
                                                    Board of Directors of the Company in February
                                                    1997.
E. Andrews Grinstead, III........   51     1991     Chairman of the Board and Chief Executive
                                                    Officer of the Company since 1991; President
                                                    of the Company since 1993; Member of the
                                                    Board of Directors of EcoScience Corporation,
                                                    Pharmos Corporation and Meridian Medical
                                                    Technologies.
</TABLE>
 
     For information relating to shares of Common Stock owned by each of the
directors, see "Security Ownership of Certain Beneficial Owners and Management."
 
                                        6
<PAGE>   9
 
BOARD AND COMMITTEE MEETINGS
 
     The Board of Directors met 12 times (including by telephone conference and
by written consent) during 1996. All directors attended at least 75% of the
meetings of the Board of Directors and of the committees on which they served.
 
     The Board of Directors has a Compensation Committee, which makes
recommendations concerning salaries and incentive compensation for employees of
and consultants to the Company, establishes and approves salaries and incentive
compensation for certain senior officers and employees and administers and
grants stock options pursuant to the Company's stock option plans. The
Compensation Committee held four meetings during 1996. The current members of
the Compensation Committee are Drs. Buchanan and Weisbach and Mr. El-Zein.
 
     The Board of Directors has an Audit Committee, which reviews the results
and scope of the audit and other services provided by the Company's independent
public accountants. The Audit Committee held one meeting during 1996. The
members of the Audit Committee are Mr. Menhall and Dr. Wyngaarden.
 
     The Company has no nominating committee of the Board of Directors.
 
DIRECTOR COMPENSATION
 
     Each non-employee director is paid $1,500 for personal or telephonic
attendance at a Board or committee meeting. Other directors are not entitled to
compensation in their capacities as directors. All of the directors are
reimbursed for their expenses incurred in connection with their attendance at
Board and committee meetings. In addition, Drs. Weisbach, Wyngaarden and
Zamecnik received compensation in the amounts of $29,000, $43,250 and $58,000,
respectively, in 1996 in connection with the provision of certain consulting
services to the Company and for serving on the Company's Scientific and/or
Clinical Advisory Boards. The Company also is a party to various consulting,
advisory and other arrangements with affiliates of Messrs. El-Khereiji, El-Zein
and Menhall. For a description of the foregoing arrangements with the Company
and certain other transactions between the Company and affiliates of certain
directors, see "Certain Transactions."
 
     In October 1995, the Company adopted the 1995 Director Stock Option Plan
(the "Director Plan"). Under the terms of the Director Plan, options to purchase
5,000 shares of Common Stock were granted to each director of the Company other
than Mr. Grinstead and Dr. Agrawal as of January 30, 1996 at an exercise price
of $13.125 per share. The Director Plan also provides that options to purchase
5,000 shares of Common Stock will be granted to each new director upon his or
her initial election to the Board of Directors. Annual options to purchase 5,000
shares of Common Stock will be granted to each eligible director on May 1 of
each year commencing in 1997. All options will vest on the first anniversary of
the date of grant (or, in the case of annual options, on April 30 of each year
with respect to options granted in the previous year); provided, that the
exercisability of these options will be accelerated upon the occurrence of a
change in control (as defined in the Director Plan). A total of 250,000 shares
of Common Stock may be issued upon the exercise of stock options granted under
the Director Plan. The exercise price of options granted under the Director Plan
will equal the closing price of the Common Stock on the date of grant. As of
February 28, 1997, options to purchase an aggregate of 35,000 shares of Common
Stock were outstanding under the Director Plan.
 
     Non-employee directors also have received options to purchase Common Stock
of the Company under the Company's 1990 Stock Option Plan (the "1990 Plan") and
the Company's 1995 Stock Option Plan (the "1995 Plan"). On November 21, 1996,
the Company granted under the 1995 Plan options to purchase 10,000 shares of
Common Stock to each of Messrs. El-Zein, El-Khereiji and Menhall and to Dr.
Buchanan and options to purchase 15,000 shares to each of Drs. Weisbach,
Wyngaarden and Zamecnik. Such options were granted at an exercise price of $7.25
per share and will become exercisable in full on May 21, 1997. On January 21,
1997, the Company granted to Dr. Weisbach options under the 1995 Plan to
purchase an
 
                                        7
<PAGE>   10
 
additional 10,000 shares of Common Stock at an exercise price of $7.50 per
share. Such options will become exercisable in full on July 21, 1997.
 
COMPENSATION OF EXECUTIVE OFFICERS
 
  Summary Compensation Table
 
     The following table sets forth the compensation for the fiscal years ended
December31, 1996 ("fiscal 1996") and December 31, 1995 for the Company's Chief
Executive Officer and its three most highly compensated executive officers
(other than the Chief Executive Officer) whose total annual salary and bonus
exceeded $100,000 in fiscal 1996 (the Chief Executive Officer and such other
executive officers are hereinafter referred to as the "Named Executive
Officers"):
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                 LONG-TERM
                                                                                COMPENSATION
                                                 ANNUAL COMPENSATION               AWARDS
                                       ---------------------------------------  ------------
                                                                     OTHER       SECURITIES
                                                                     ANNUAL      UNDERLYING    ALL OTHER
 NAME AND PRINCIPAL POSITION            SALARY         BONUS      COMPENSATION    OPTIONS     COMPENSATION
- ------------------------------         --------       --------    ------------  ------------  ------------
<S>                            <C>     <C>            <C>         <C>           <C>           <C>
E. Andrews Grinstead, III..... 1996    $375,000       $225,000      $ 82,386(1)    250,000      $ 43,527(2)(3)
  Chairman of the Board,       1995    $270,000       $235,000      $ 19,655(4)    599,230      $118,332(5)(10)
  President and Chief
  Executive Officer
Anthony J. Payne.............. 1996    $243,750       $107,000      $ 45,616(1)    125,000      $ 14,853(2)(3)
  Senior Vice President of     1995    $175,000       $137,500      $ 30,469(4)    215,808      $ 45,250(5)(10)
  Finance and Administration,
  Chief Financial Officer,
  Treasurer and Secretary
Sudhir Agrawal, D. Phil....... 1996    $250,000       $100,000             0       125,000      $ 28,676(6)(3)
  Senior Vice President of     1995    $178,250       $114,125             0       150,000      $ 38,523(7)(10)
  Discovery, Chief Scientific
  Officer and Director
Paul J. Schechter, M.D.,       1996    $243,750       $112,500             0        65,000      $ 13,494(6)(3)
  Ph.D........................
  Former Senior Vice President 1995    $175,000       $137,500(8)   $ 23,396(9)     40,000      $ 23,441(7)(10)
  of Drug Development(11)
</TABLE>
 
- ---------------
 
 (1) Includes $76,017 and $36,938 paid by the Company to Messrs. Grinstead and
     Payne, respectively, in lieu of employee benefits in 1997.
 
 (2) Includes $11,364 and $3,134 paid by the Company to Messrs. Grinstead and
     Payne, respectively, during 1996 with respect to life insurance for the
     benefit of the Named Executive Officer.
 
 (3) Includes $32,163, $11,719, $24,399 and $9,645 paid to Mr. Grinstead, Mr.
     Payne, Dr. Agrawal and Dr. Schechter, respectively, in consideration of the
     surrender of accrued but unused vacation days during 1996.
 
 (4) Includes $12,510 and $23,594 paid by the Company to Messrs. Grinstead and
     Payne, respectively, in lieu of employee benefits in 1996.
 
 (5) Includes $34,345 and $4,531 paid by the Company to Messrs. Grinstead and
     Payne, respectively, during 1995 with respect to life insurance for the
     benefit of the Named Executive Officer.
 
                                        8
<PAGE>   11
 
 (6) Includes $4,277 and $3,849 contributed by the Company on behalf of Drs.
     Agrawal and Schechter, respectively, pursuant to the Company's 401(k) Plan
     in 1996.
 
 (7) Includes $4,500 and $4,091 contributed by the Company on behalf of Drs.
     Agrawal and Schechter, respectively, pursuant to the Company's 401(k) Plan
     in 1995.
 
 (8) Includes $112,500 paid as a bonus for services rendered in 1995 and $25,000
     of the $50,000 bonus that Dr. Schechter received upon joining the Company,
     which $25,000 portion vested in 1995.
 
 (9) Represents tax adjustments and relocation reimbursements paid to the Named
     Executive Officer in 1995.
 
(10) Includes $83,987, $40,719, $34,023 and $19,350 paid to Mr. Grinstead, Mr.
     Payne, Dr. Agrawal and Dr. Schechter, respectively, in consideration of the
     surrender of accrued but unused vacation days during the period from the
     commencement of such Named Executive Officer's employment with the Company
     through December 31, 1995.
 
(11) Dr. Schechter's employment with the Company terminated as of February 28,
     1997.
 
  Employment Agreements
 
     The Company is a party to an employment agreement with Mr. Grinstead for
the period commencing July 1, 1996 and ending June 30, 2001. Under this
agreement, Mr. Grinstead is currently entitled to receive an annual base salary
of $375,000. Mr. Grinstead also is eligible to receive (i) a cash bonus each
year related to the attainment of management objectives specified by the Board
of Directors and (ii) additional payments of $16,000 in 1997 and 1998. In the
event Mr. Grinstead's employment is terminated by the Company without cause (as
defined) or by him for good cause (as defined), the Company will pay Mr.
Grinstead during the 24-month period following his termination a monthly amount
equal to one-twelfth of the sum of Mr. Grinstead's annual base salary as of the
date of termination and the average bonus paid to him during the three years
preceding his termination (the "Average Bonus Amount"). The Company also will
continue Mr. Grinstead's benefits for such period, subject to earlier
termination under certain circumstances. If his employment is terminated by the
Company for failure to perform his assigned duties, he will continue to receive
his annual base salary and benefits during the six-month period following such
termination. Notwithstanding the foregoing, in the event that Mr. Grinstead's
employment is terminated for any of the above reasons within 12 months following
a Change in Control (as defined) of the Company, Mr. Grinstead will be entitled
to receive, in lieu of the payments described above, a lump sum payment equal to
300% of the sum of his annual base salary and his Average Bonus Amount.
 
     In accordance with the terms of Mr. Grinstead's previous employment
agreement, the Company loaned $190,000 to Mr. Grinstead in December 1992
pursuant to the terms of a promissory note bearing simple interest at a rate of
6% per year, which originally provided for the payment of principal and all
accrued interest on the earlier of December 23, 1995 or the expiration or
termination of Mr. Grinstead's employment by the Company, but is currently
payable on demand. Such loan remained outstanding as of February 28, 1997, at
which date the total unpaid balance of principal and interest was $235,850.
 
     The Company is a party to an employment agreement with Mr. Payne for the
period commencing July 1, 1996 and ending June 30, 2000. Under this agreement,
Mr. Payne is currently entitled to receive an annual base salary of $243,750.
Mr. Payne also is eligible to receive a cash bonus each year related to the
attainment of management objectives specified by the Chief Executive Officer and
the Board of Directors. In the event Mr. Payne's employment is terminated by the
Company without cause (as defined) or by him for good cause (as defined), the
Company will pay Mr. Payne during the 24-month period following his termination
a monthly amount equal to one-twelfth of the sum of Mr. Payne's annual base
salary as of the date of
 
                                        9
<PAGE>   12
 
termination and the average bonus paid to him during the three years preceding
his termination (the "Average Bonus Amount"). The Company will also continue Mr.
Payne's benefits for such period, subject to earlier termination under certain
circumstances. If his employment is terminated by the Company for failure to
perform his assigned duties, he will continue to receive his annual base salary
and benefits during the six-month period following such termination.
Notwithstanding the foregoing, in the event that Mr. Payne's employment is
terminated for any of the above reasons within 12 months following a Change in
Control (as defined) of the Company, Mr. Payne will be entitled to receive, in
lieu of the payments described above, a lump sum payment equal to 300% of the
sum of his annual base salary and his Average Bonus Amount.
 
     In accordance with the terms of his previous employment agreement, the
Company loaned $50,000 to Mr. Payne in February 1992 pursuant to the terms of a
promissory note bearing simple interest at a rate of 6% per year. The promissory
note originally provided for the payment of principal and all accrued interest
on February 6, 1995, and is currently payable on demand. Such loan remained
outstanding as of February 28, 1997, at which date the total unpaid balance of
principal and interest was $64,867.
 
     The Company is a party to an employment agreement with Dr. Agrawal for the
period commencing July 1, 1996 and ending June 30, 2000. Under this agreement,
Dr. Agrawal serves as Senior Vice President of Discovery and Chief Scientific
Officer of the Company and is currently entitled to receive an annual base
salary of $250,000. Dr. Agrawal is eligible to receive a cash bonus each year
related to the attainment of management objectives specified by the Chief
Executive Officer and the Board of Directors. In the event Dr. Agrawal's
employment is terminated by the Company without cause (as defined) or by him for
good cause (as defined), the Company will pay Dr. Agrawal during the 24-month
period following his termination a monthly amount equal to one-twelfth of the
sum of Dr. Agrawal's annual base salary as of the date of termination and the
average bonus paid to him during the three years preceding his termination (the
"Average Bonus Amount"). The Company will also continue Dr. Agrawal's benefits
for such period, subject to earlier termination under certain circumstances. If
his employment is terminated by the Company for failure to perform his assigned
duties, he will continue to receive his annual base salary and benefits during
the six-month period following such termination. Notwithstanding the foregoing,
in the event that Dr. Agrawal's employment is terminated for any of the above
reasons within 12 months following a Change in Control (as defined) of the
Company, Dr. Agrawal will be entitled to receive, in lieu of the payments
described above, a lump sum payment equal to 300% of the sum of his annual base
salary and his Average Bonus Amount. Under the terms of this employment
agreement, Dr. Agrawal is permitted to maintain his Visiting Scholar status and
privileges with the Worcester Foundation.
 
     The employment agreements entered into between the Company and each of
Messrs. Grinstead and Payne and Dr. Agrawal also provide that all stock options
held by any of the Named Executive Officers (including existing options and
options to be granted in the future) shall include terms providing (i) that in
the event that such Named Executive Officer's employment is terminated by the
Company without cause or by him for good cause the exercisability of such stock
options will be accelerated by two years and such stock options will be
exercisable for a two-year period following termination and (ii) that in the
event of certain changes in control of the Company, its liquidation or the sale
of all or substantially all of its assets, all such stock options not then
exercisable will vest and become immediately exercisable. The Company is also a
party to registration rights agreements with each of Mr. Grinstead and Mr. Payne
that provide that in the event the Company proposes to register any of its
securities under the Securities Act of 1933, as amended (the "Securities Act"),
at any time, with certain exceptions, the employee shall be entitled to include
the shares of Common Stock held by him in such registration, subject to the
right of the managing underwriter of any underwritten offering to exclude from
such registration for marketing reasons some or all of such shares. The Company
also is a party to indemnification agreements with each of Mr. Grinstead and Mr.
Payne pursuant to
 
                                       10
<PAGE>   13
 
which the Company has agreed to indemnify the employee for certain liabilities,
including liabilities arising under the Securities Act.
 
     Dr. Schechter's employment with the Company terminated as of February 28,
1997. The Company is a party to an agreement with Dr. Schechter regarding the
termination of his employment. Pursuant to this agreement, options to purchase
an aggregate of 176,550 shares of Common Stock were amended to provide for the
acceleration by two years of the exercisability of such options and to extend
the period during which such options may be exercised until the second
anniversary of the termination of Dr. Schechter's employment. In addition, under
this agreement, the Company agreed to pay Dr. Schechter during the 24-month
period following his termination a monthly amount equal to one-twelfth of the
sum of Dr. Schechter's annual base salary as of February 28, 1997 and the
average bonus paid to him during the three years preceding his termination. The
Company has also agreed to continue Dr. Schechter's benefits for such period,
subject to earlier termination under certain circumstances.
 
     Stock options to purchase an aggregate of 1,409,206 shares of Common Stock
granted to the Named Executive Officers pursuant to the 1990 Plan provide that,
upon a change in control (as defined in the 1990 Plan), all options granted
thereunder will become fully exercisable. In addition, pursuant to the terms of
the employment agreements entered into between the Company and each of the Named
Executive Officers described above (i) in April 1997, stock options to purchase
an aggregate of 728,479 shares of Common Stock granted to the Named Executive
Officers under the Company's 1995 Plan were amended to provide that such options
will become fully exercisable upon a change in control of the Company, and (ii)
all stock options granted to the Named Executive Officers after March 1, 1997
will provide that such options will become fully exercisable upon a change of
control of the Company.
 
  Option Grants Table
 
     The following table sets forth certain information concerning grants of
stock options made during fiscal 1996 to each of the Named Executive Officers:
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                    INDIVIDUAL GRANTS
                                                -------------------------                  POTENTIAL REALIZABLE
                                                  PERCENTAGE                                 VALUE AT ASSUMED
                                                   OF TOTAL                                ANNUAL RATES OF STOCK
                                 NUMBER OF         OPTIONS       EXERCISE                 PRICE APPRECIATION FOR
                                SECURITIES         GRANTED        PRICE                       OPTIONS TERM(2)
                                UNDERLYING       TO EMPLOYEES      PER      EXPIRATION   -------------------------
                              OPTIONS GRANTED   IN FISCAL YEAR    SHARE      DATE(1)         5%            10%
                              ---------------   --------------   --------   ----------   ----------     ----------
<S>                           <C>               <C>              <C>        <C>          <C>            <C>
E. Andrews Grinstead, III..      100,000(3)          4.8%        $11.57      2/22/06    $  749,000     $1,975,000
                                 150,000(4)          7.3          11.57      2/22/06     1,123,500      2,962,500
Anthony J. Payne...........       25,000(3)          1.2          11.57      2/22/06       187,250        493,750
                                 100,000(4)          4.8          11.57      2/22/06       749,000      1,975,000
Sudhir Agrawal.............       25,000(4)          1.2          11.57      2/22/06       187,250        493,750
                                 100,000(4)          4.8          11.57      2/22/06       749,000      1,975,000
Paul J. Schechter..........       25,000(4)          1.2          11.57      2/22/06       187,250        493,750
                                  40,000(4)          1.9          11.57      2/22/06       299,600        790,000
</TABLE>
 
- ---------------
 
(1) The expiration date of an option is the tenth anniversary of the date on
    which the option was originally granted.
 
                                       11
<PAGE>   14
 
(2) The amounts shown on this table represent hypothetical gains that could be
    achieved for the respective options if exercised at the end of the option
    term. These gains are based on assumed rates of stock appreciation of 5% and
    10%, compounded annually from the date the respective options were granted
    to their expiration date. The gains shown are net of the option exercise
    price, but do not include deductions for taxes or other expenses associated
    with the exercise. Actual gains, if any, on stock option exercises will
    depend on the future performance of the Common Stock, the optionholders'
    continued employment through the option period, and the date on which the
    options are exercised.
 
(3) These stock options are immediately exercisable.
 
(4) These stock options are immediately exercisable with respect to 20% of the
    shares covered thereby and will become exercisable with respect to the
    remaining 80% of the shares covered thereby in four equal annual
    installments in arrears commencing on February 22, 1997.
 
  Aggregated Option Exercises and Year-End Option Table
 
     The following table sets forth certain information concerning each exercise
of a stock option during fiscal 1996 by each of the Named Executive Officers and
the number and value of unexercised options held by each of the Named Executive
Officers on December 31, 1996:
 
                      AGGREGATED OPTION EXERCISES IN LAST
                        FISCAL YEAR AND FISCAL YEAR-END
                                 OPTION VALUES
 
<TABLE>
<CAPTION>
                                                             NUMBER OF              VALUE OF
                                                              SHARES               UNEXERCISED
                                                            UNDERLYING            IN THE MONEY
                                                            OPTIONS AT          OPTIONS AT FISCAL
                                                          FISCAL YEAR-END          YEAR-END(1)
                                                          --------------           -----------
                                                           EXERCISABLE/           EXERCISABLE/
                                                           UNEXERCISABLE          UNEXERCISABLE
                                                          ---------------       -----------------
<S>                                                       <C>                   <C>
E. Andrews Grinstead, III...............................  862,564/120,000        $     116,667/--
Anthony J. Payne........................................  294,142/102,500               82,605/--
Sudhir Agrawal..........................................  350,000/ 80,000              530,625/--
Paul J. Schechter(2)....................................   88,000/ 77,000           39,375/13,125
</TABLE>
 
- ---------------
 
(1) The closing price for the Common Stock as reported by The Nasdaq National
    Market on December 31, 1996 (the last day of trading) in 1996 was $5.875.
    Value is calculated on the basis of the difference between the option
    exercise price and $5.875, multiplied by the number of shares of Common
    Stock underlying the option.
 
(2) Dr. Schechter's employment with the Company terminated as of February 28,
    1997.
 
     Since January 1, 1997, the Company has granted options to purchase an
aggregate of 1,202,525 shares of Common Stock at a weighted average exercise
price of $6.10 per share, of which options to purchase 281,532 shares, 130,331
shares, 135,066 shares and 11,550 shares, at weighted average exercise prices
per share of $6.07, $6.06, $6.07 and $6.25, were granted to Mr. Grinstead, Mr.
Payne, Dr. Agrawal and Dr. Schechter, respectively. Of the options granted to
Mr. Grinstead, Mr. Payne and Dr. Agrawal, options to purchase 16,806 shares,
6,316 shares, and 7,263 shares, respectively, will become exercisable on August
19, 1998, options to purchase 67,226 shares, 25,265 shares and 29,053 shares,
respectively, will become exercisable in four equal annual installments in
arrears commencing on February 19, 1998, and options to purchase 197,500 shares,
98,750 shares and 98,750 shares, respectively, will become exercisable in four
equal annual installments in
 
                                       12
<PAGE>   15
 
arrears commencing on April 9, 1998. Of the options to purchase 11,550 shares
granted to Dr. Schechter, options to purchase 6,930 shares are fully exercisable
and options to purchase the remainder of such shares have been cancelled.
 
  Report of the Compensation Committee on Executive Compensation
 
     The Compensation Committee of the Company's Board of Directors is
responsible for establishing compensation policies with respect to the Company's
executive officers, including the Chief Executive Officer and the other
executive officers named in the Summary Compensation Table, and setting the
compensation for these individuals.
 
     The Compensation Committee seeks to achieve three broad goals in connection
with the Company's executive compensation programs and decisions regarding
individual compensation. First, the Compensation Committee structures executive
compensation programs in a manner that the Committee believes will enable the
Company to attract and retain key executives. In order to ensure continuity of
certain key members of management, the Compensation Committee has historically
approved multi-year employment contracts for its executives. Second, the
Compensation Committee establishes compensation programs that are designed to
reward executives for the achievement of business objectives of the Company
and/or the individual executive's particular area of responsibility. By linking
compensation in part to achievement, the Compensation Committee believes that a
performance-oriented environment is created for the Company's executives.
Finally, the Company's executive compensation programs are intended to provide
executives with an equity interest in the Company so as to link a portion of the
compensation of the Company's executives with the performance of the Company's
Common Stock.
 
     The compensation programs for the Company's executives established by the
Compensation Committee consist of three elements based upon the foregoing
objectives: base salary; annual cash bonus; and a stock-based equity incentive
in the form of participation in the Company's stock option plans. In early 1996,
the Compensation Committee engaged and consulted with an independent
compensation consultant with respect to adjustments in the base salaries of the
Company's executives for 1996 and stock option grants in 1996. Such consultant
also advised the Compensation Committee as to the terms of the new multi-year
employment agreements entered into with the Company's executives upon the
expiration of their previous agreements.
 
     In establishing base salaries for the executive officers, including the
Chief Executive Officer, which base salaries have been fixed in the executive
officers' employment agreements, the Compensation Committee monitors salaries at
other companies, particularly those that are in the same industry as the Company
or related industries and/or located in the same general geographic area as the
Company, considers historic salary levels of the individual and the nature of
the individual's responsibilities and compares the individual's base salary with
those of other executives at the Company. The Compensation Committee also
considers the challenges involved in retaining first-rate managerial personnel
in the antisense field because of the new nature of this technology. To the
extent determined to be appropriate, the Compensation Committee also considers
general economic conditions, the Company's financial performance and the
individual's performance.
 
     In establishing bonuses for the executive officers, including the Chief
Executive Officer, the Compensation Committee focuses on individual and
corporate performance during the past year. In 1996, the Company entered into
new employment agreements with the Company's executives which, among other
things, provided for the elimination of certain minimum guaranteed bonuses as
set forth in previous employment agreements with the Company's executives. In
establishing bonuses for 1996, the Compensation Committee considered the
significant accomplishments achieved by the Company in areas such as product
development and enhancement of the Company's patent and licensing position, the
establishment of the Hybridon Specialty Products Division and the contributions
made by the Company's executive officers to achieve these
 
                                       13
<PAGE>   16
 
accomplishments. In establishing the bonus for Mr. Grinstead for 1996, it was
the Compensation Committee's judgment that Mr. Grinstead played a key leadership
role with respect to the Company's accomplishments in 1996.
 
     The Compensation Committee uses stock options as a significant element of
the compensation package of the Company's executive officers, including the
Chief Executive Officer, because they provide an incentive to executives to
maximize stockholder value and because they reward the executives only to the
extent that stockholders also benefit. It is not the policy of the Compensation
Committee, however, to grant stock options to executives annually, and the
timing of such grants depends upon a number of factors, including new hires of
executives, the executives' current stock and option holdings and such other
factors as the Compensation Committee deems relevant. In granting stock options
in 1996 to the Company's executives, including Mr. Grinstead, the Compensation
Committee considered a variety of factors, including the Company's
accomplishments in the areas described above with respect to the establishment
of bonuses. Likewise, the grant of stock options to Mr. Grinstead in 1996 was
based on the Compensation Committee's judgment as to the leadership role Mr.
Grinstead played with respect to these accomplishments. When granting stock
options, it has generally been the policy of the Compensation Committee to fix
the exercise price of such options at 100% of the fair market value of the
Common Stock on the date of grant.
 
     Section 162(m) of the Internal Revenue Code of 1986, as amended (the
"Code"), enacted in 1993, generally disallows a tax deduction to public
companies for compensation over $1,000,000 paid to its chief executive officer
and its four other most highly compensated executive officers. Qualifying
performance-based compensation will not be subject to the deduction limit if
certain requirements are met. In this regard, the Company has limited the number
of shares subject to stock options which may be granted to Company employees in
a manner that complies with the performance-based requirements of Section
162(m). Based on the compensation awarded to Mr. Grinstead and the other
executive officers of the Company, it does not appear that the Section 162(m)
limitation will have a significant impact on the Company in the near term. While
the Committee does not currently intend to qualify its incentive awards as a
performance-based plan, it will continue to monitor the impact of Section 162(m)
on the Company.
 
                                            COMPENSATION COMMITTEE
 
                                            J. Robert Buchanan
                                            Youssef El-Zein
                                            Jerry A. Weisbach
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     The current members of the Company's Compensation Committee are Drs.
Buchanan and Weisbach and Mr. El-Zein. Dr. Andre L. Lamotte, who resigned as a
Director of the Company on February 19, 1997, also served as a member of the
Compensation Committee during fiscal 1996. No executive officer of the Company
has served as a director or member of the compensation committee (or other
committee serving an equivalent function) of any other entity, whose executive
officers served as a director of or member of the Compensation Committee of the
Company.
 
     Since January 1, 1996, the Company has entered into or engaged in certain
transactions with Pillar S.A., Pillar Limited and Charles River Building Limited
Partnership (the "Cambridge Landlord"), entities of which Mr. El-Zein is an
affiliate, and with Medical Science Partners, L.P. ("MSP"), an entity of which
Dr. Lamotte is an affiliate. See "Certain Transactions."
 
                                       14
<PAGE>   17
 
CERTAIN TRANSACTIONS
 
     Since January 1, 1996, the Company has entered into or engaged in the
following transactions with the following directors, officers and stockholders
who beneficially own more than 5% of the outstanding Common Stock of the Company
("5% Stockholders"), and affiliates of such directors, officers and 5%
Stockholders.
 
  Transactions with Pillar S.A. and Certain of its Affiliates
 
     Since January 1, 1996, the Company has entered into or engaged in certain
transactions with Pillar S.A., Pillar Limited and the Cambridge Landlord. Pillar
S.A. and Pillar Limited are affiliates of Messrs. El-Zein and Menhall, two
directors of the Company. The Cambridge Landlord is an affiliate of Messrs.
El-Zein and Menhall and Mr. El-Khereiji, a third director of the Company. The
following is a summary of these transactions.
 
     In 1996, the Company was a party to a consulting agreement (the "1994
Pillar Consulting Agreement") with Pillar S.A., dated as of March 1, 1994,
pursuant to which Pillar S.A. provided the Company with financial advisory and
managerial services in connection with the Company's overseas operations,
including support services in connection with contracts and agreements. Under
the terms of the 1994 Pillar Consulting Agreement, the Company is paying Pillar
S.A. continuing consulting fees of $60,000 per month and $23,000 per month for
overhead costs, and reimbursement of certain authorized out-of-pocket expenses.
In September 1996, the Company and Pillar S.A. extended the date on which the
1994 Pillar Consulting Agreement will expire to February 28, 1998.
 
     Pursuant to the 1994 Pillar Consulting Agreement, the Company issued to
Pillar S.A. two five-year warrants to purchase an aggregate of 200,000 shares of
Common Stock of the Company. The 1994 Pillar Consulting Agreement also provides
that if the Company obtains all necessary governmental and regulatory approvals
for the commercial sale of an antisense drug for the treatment of AIDS and HIV
infection (an "Approved AIDS and HIV Drug") in one or more of certain specified
European countries prior to December 31, 1997, the Company will issue Pillar
S.A. five-year warrants (the "Pillar Incentive Warrants") to purchase a number
of shares of Common Stock equal to 25,000 shares for each quarter sooner than
the last quarter of 1997 in which the Company has an Approved AIDS and HIV Drug
in any such country. The exercise price for the Pillar Incentive Warrants will
be determined pursuant to a formula set forth in the 1994 Pillar Consulting
Agreement.
 
     On July 8, 1995, the Company entered into an additional agreement (the
"Pillar Europe Agreement") with Pillar S.A. pursuant to which Pillar S.A. agreed
to provide to the Company certain consulting, advisory and related services (in
addition to the services to be provided pursuant to the 1994 Pillar Consulting
Agreement) and serve as the Company's exclusive agent in connection with
potential corporate partnerships in Europe and as a non- exclusive placement
agent of the Company in connection with private placements of securities of the
Company for a period of two years. On November 1, 1995, the Pillar Europe
Agreement was amended to provide that (i) Pillar S.A. would cease to serve as
the Company's exclusive agent in connection with potential corporate
partnerships in Europe, but would continue to serve as a non-exclusive agent in
such respect, (ii) Pillar S.A. would receive a retainer of $26,470 per month for
the balance of the term of the Pillar Europe Agreement (April 1, 1997), (iii)
the fees set forth in the Pillar Europe Agreement would only be payable to
Pillar S.A. in connection with potential collaborations with any French
pharmaceutical company with which the Company engaged in discussions during the
12- month period ended November 1, 1995 as a result of introductions by Pillar
S.A. and (iv) any compensation payable to Pillar S.A. in connection with its
services with respect to othe corporate collaborations or any placements of
securities would be negotiated on a case-by-case basis and would be subject to
the approval of the independent members of the Board of Directors of the
Company. In consideration of such agreement, the Company agreed to pay Pillar
S.A. a fee totalling $300,000.
 
                                       15
<PAGE>   18
 
     During the year ended December 31, 1996, the Company paid Pillar S.A. an
aggregate of $1,680,000 under the 1994 Pillar Consulting Agreement and the
Pillar Europe Agreement, as amended, including the payment of the $300,000 fee
referred to above.
 
     The Company is a party to a lease (the "Cambridge Lease") with the
Cambridge Landlord dated as of February 4, 1994. The Cambridge Lease covers
approximately 90,000 square feet of space in Cambridge, Massachusetts, has an
initial term of ten years commencing on February 1, 1997, and may be extended
for three additional five-year terms at the option of the Company. The Cambridge
Lease originally provided for an annual rent equal to $30 per square foot on a
triple net basis for the first five years, $33 per square foot on a triple net
basis for the next five years and the greater of $30 per square foot on a triple
net basis or the then market value of leased property for each of the five-year
renewal terms. In connection with the Company's election to acquire an interest
in the Cambridge Landlord described below, the annual rent due under the
Cambridge Lease was increased for the first five years of the lease term to $38
per square foot on a triple net basis and for the second five years to $42 per
square foot on a triple net basis.
 
     On July 1, 1996, the Company elected to fund approximately $5.5 million of
the costs (primarily relating to tenant improvements) of the construction of the
leased premises through contributions to the capital of the Cambridge Landlord
in exchange for a limited partnership interest in the Cambridge Landlord (the
"Partnership Interest"). The Partnership Interest entitles the Company to an
approximately 32% interest in the Cambridge Landlord. Hybridon's right to
receive distributions of cash generated from operations or from any sale or
refinancing of the property is subordinate to the distribution to certain other
limited partners of priority amounts currently totalling approximately $6.5
million. In the case of a sale or refinancing of the property, after payment of
the priorities described in the immediately preceding sentence, Hybridon is
entitled to a return of its capital contribution and, thereafter, to its pro
rata share of the remaining funds available for distribution. The Company also
has the right, for a period of three years ending February 2000, to sell the
Partnership Interest back to certain limited partners of the Cambridge Landlord
for a price equal to the greater of (i) the aggregate cash contribution made by
Hybridon to the Cambridge Landlord or (ii) the fair market value of the
Partnership Interest at the time. The assets of these limited partners are
limited to their investment in the Cambridge Landlord.
 
     The Company is a party to a lease (the "Paris Lease") with a third party
dated March 23, 1994 for approximately 1,800 square feet of space in Paris,
France. The Company's obligations under the Paris Lease have been guaranteed by
Pillar S.A.
 
  Other Transactions
 
     In December 1992, the Company and F. Hoffmann-La Roche Ltd. ("Roche")
entered into a collaboration involving the application of Hybridon's antisense
oligonucleotide chemistry to the development of compounds for the treatment of
hepatitis B, hepatitis C and human papilloma viruses. Under this collaboration,
Roche funded research and development efforts relating to the collaboration and
committed personnel of its own to the collaboration. In the third quarter of
1996, Roche notified the Company that it had selected an antisense
oligonucleotide directed at human papilloma virus as a lead compound for further
development, and in the fourth quarter of 1996, made a milestone payment to the
Company in connection with such designation. At such time, Roche also notified
the Company that Roche had elected not to continue the hepatitis B program under
the research and development collaboration. As a result, in light of the
selection by Roche of lead compounds directed at hepatitis C and human papilloma
virus for further development and its determination to discontinue the hepatitis
B program, Roche notified the Company that Roche was exercising its option to
terminate the research phase of the collaboration as of March 31, 1997. All
rights relating to the hepatitis B program have reverted to the Company.
 
                                       16
<PAGE>   19
 
     The Company has licensed to Roche any products resulting from the
collaboration on a royalty-bearing, worldwide exclusive basis. Subject to
compliance with certain production cost requirements, Roche is required to
purchase from Hybridon, and Hybridon is required to supply to Roche, Roche's
requirements of products at specified transfer prices. During the year ended
December 31, 1996, Roche paid the Company an aggregate of $1,035,000 under the
collaboration.
 
     In October 1995, Hybridon entered into a letter of intent with Symbiotech,
Inc., a development stage biotechnology company of which MSP is the principal
stockholder and Dr. Lamotte is President and a director ("Symbiotech"), to form
a new company for the development of quantitative in vitro diagnostic, detection
and biological amplification products using certain of the Company's antisense
oligonucleotides and Symbiotech's phage technology. The letter of intent
provides, among other things, for each of Hybridon and Symbiotech to grant the
new company exclusive worldwide royalty-free licenses of certain of their
respective technologies for the development of these products. The letter of
intent also has been signed by Pillar S.A. and MSP. Pillar S.A. and MSP have
indicated an intention initially to invest a total of $250,000 in the new
company. It is anticipated that each of Hybridon and Symbiotech initially will
own approximately one-third of the equity in the new company, with the balance
held by MSP, Pillar S.A. and certain key employees or consultants, including
certain officers and directors of the Company. The majority of the capital stock
of Symbiotech is owned by MSP. Because a definitive agreement relating to this
transaction has not yet been executed by the parties, it is possible that the
final terms of this arrangement may differ from those summarized above, possibly
materially, or that this transaction will not be consummated.
 
     Certain persons and entities (the "Rightsholders"), including Dr. Zamecnik,
MSP, Medical Science Partners II, L.P. ("MSP II"), Medical Science II
Co-Investment L.P. ("Medical Science Co-Investment"), Pillar S.A., Pillar
Limited, Roche, HTI, Mr. Bin Laden and Nicris, are entitled to certain rights
with respect to the registration under the Securities Act of certain shares of
the Company's Common Stock (the "Registrable Shares"), including shares of
Common Stock that may be acquired pursuant to the exercise of options or
warrants, under the terms of agreements among the Company and the Rightsholders
(the "Registration Agreements"). MSP II and Medical Science Co-Investment are
entities of which Mr. Lamotte is an affiliate. The Registration Agreements
generally provide that in the event the Company proposes to register any of its
securities under the Securities Act at any time, with certain exceptions, the
Rightsholders shall be entitled to include Registrable Shares in such
registration, subject to certain conditions and limitations. Certain
Rightsholders, including MSP, MSP II, Medical Science Co-Investment, Pillar
S.A., Pillar Limited, Roche, HTI, Mr. Bin Laden and Nicris, but excluding, among
others, Dr. Zamecnik, have the additional right under certain Registration
Agreements to require the Company to prepare and file registration statements
under the Securities Act, if such Rightsholders holding specified percentages of
the Registrable Shares so request, and the Company is required to use its best
efforts to effect such registration, subject to certain conditions and
limitations.
 
     For a description of certain employment and other arrangements between the
Company and its executive officers, see "Compensation of Executive Officers"
above. For a description of stock options granted to certain directors of the
Company, see "Director Compensation" above.
 
     The Company believes that the terms of the transactions described above
were no less favorable than the Company could have obtained from unaffiliated
third parties.
 
                                       17
<PAGE>   20
 
COMPARATIVE STOCK PERFORMANCE
 
     The comparative stock performance graph below compares the cumulative
stockholder return on the Company's Common Stock for the period from January 25,
1996 (the effective date of the initial public offering of the Company's Common
Stock) through December 31, 1996 with the cumulative total return on (i) the
Nasdaq Market Index and (ii) a peer group index (the "SIC Code Index") selected
by the Company which is comprised of the 87 publicly traded companies, including
the Company, that are currently grouped under the Standard Industrial Code
pertaining to businesses engaged in the manufacture or development of biological
products other than diagnostic substances (assuming the investment of $100 in
the Company's Common Stock, the Nasdaq Market Index and the SIC Code Index on
January 25, 1996 and reinvestment of all dividends). Measurement points are on
January 25, 1996, March 29, 1996, June 28, 1996, September 30, 1996 and the last
trading day of the year ended December 31, 1996. Prior to January 25, 1996, the
Company's Common Stock was not registered under the Exchange Act.
 
<TABLE>
<CAPTION>
        Measurement Period                                      Nasdaq Market
      (Fiscal Year Covered)                 Hybridon Inc            Index          SIC Code Index
<S>                                         <C>                 <C>                 <C>
1/25                                               100                 100                 100
3/29                                             85.71               96.32              103.98
6/28                                            111.31               92.75              111.68
9/30                                             73.81              101.47              114.76
12/31                                            55.95               94.51              120.16
</TABLE>
 
              PROPOSAL 2 -- APPROVAL OF 1997 STOCK INCENTIVE PLAN
 
     On March 20, 1997, the Board of Directors adopted, subject to stockholder
approval, the 1997 Plan. Up to 3,000,000 shares of Common Stock (subject to
adjustment in the event of stock splits and other similar events) may be issued
pursuant to awards granted under the 1997 Plan.
 
     Currently, 4,625 shares remain available for stock option grants under the
Company's 1995 Plan. The Board of Directors believes that the continued growth
and profitability of the Company depends, in large part, upon the ability of the
Company to maintain a competitive position in attracting, retaining and
motivating key personnel.
 
                                       18
<PAGE>   21
 
     The following is a summary of the material provisions of the 1997 Plan:
 
DESCRIPTION OF AWARDS
 
     The 1997 Plan provides for the grant of options that are intended to
qualify as incentive stock options within the meaning of Section 422 of the Code
("incentive stock options"), options not intended to qualify as incentive stock
options ("nonstatutory stock options"), restricted stock awards and other
stock-based awards, including the grant of shares based upon certain conditions,
the grant of securities convertible into Common Stock and the grant of stock
appreciation rights (collectively "Awards").
 
  Incentive Stock Options and Nonstatutory Stock Options
 
     Optionees receive the right to purchase a specified number of shares of
Common Stock at some time in the future at a specified option price and subject
to such other terms and conditions as are specified in connection with the
option grant. Options may be granted at an exercise price which may be less
than, equal to or greater than the fair market value of the Common Stock on the
date of grant. Under present law, however, incentive stock options and options
intended to qualify as performance-based compensation under Section 162(m) of
the Code may not be granted at an exercise price less than the fair market value
of the Common Stock on the date of grant (or less than 110% of the fair market
value in the case of incentive stock options granted to optionees holding 10% or
more of the voting power of the Company). The 1997 Plan permits the Board of
Directors to determine the manner of payment of the exercise price of options,
including through payment by cash, check or in connection with a "cashless
exercise" through a broker, by surrender to the Company of shares of Common
Stock, by delivery to the Company of a promissory note, or by any other lawful
means.
 
  Restricted Stock Awards
 
     Restricted Stock Awards entitle recipients to acquire shares of Common
Stock, subject to the right of the Company to repurchase all or part of such
shares from the recipient in the event that the conditions specified in the
applicable Award are not satisfied prior to the end of the applicable
restriction period established for such Award.
 
  Other Stock-Based Awards
 
     Under the 1997 Plan, the Board has the right to grant other Awards based
upon the Common Stock having such terms and conditions as the Board may
determine, including the grant of shares based upon certain conditions, the
grant of securities convertible into Common Stock and the grant of stock
appreciation rights.
 
ELIGIBILITY TO RECEIVE AWARDS
 
     Officers, employees, directors, consultants and advisors of the Company and
its subsidiaries are eligible to be granted Awards under the 1997 Plan. Under
present law, however, incentive stock options may only be granted to employees.
The maximum number of shares with respect to which an Award may be granted to
any participant under the 1997 Plan may not exceed 500,000 shares per calendar
year.
 
     As of February 28, 1997, approximately 254 persons were eligible to receive
Awards under the 1997 Plan, including all of the Company's employees and
consultants, and the Company's three executive officers and seven non-employee
directors. The granting of Awards under the 1997 Plan is discretionary, and the
Company cannot now determine the number or type of Awards to be granted in the
future to any particular person or group.
 
                                       19
<PAGE>   22
 
ADMINISTRATION
 
     The 1997 Plan is administered by the Board of Directors. The Board has the
authority to adopt, amend and repeal the administrative rules, guidelines and
practices relating to the 1997 Plan and to interpret the provisions of the 1997
Plan. Pursuant to the terms of the 1997 Plan, the Board of Directors may
delegate authority under the 1997 Plan to one or more committees of the Board,
and subject to certain limitations, to one or more executive officers of the
Company. The Board has authorized the Compensation Committee to administer
certain aspects of the 1997 Plan, including the granting of options to executive
officers. Subject to any applicable limitations contained in the 1997 Plan, the
Board of Directors, the Compensation Committee, or any other committee or
executive officer to whom the Board delegates authority, as the case may be,
selects the recipients of Awards and determines (i) the number of shares of
Common Stock covered by options and the dates upon which such options become
exercisable, (ii) the exercise price of options, (iii) the duration of options,
and (iv) the number of shares of Common Stock subject to any restricted stock or
other stock-based Awards and the terms and conditions of such Awards, including
conditions for repurchase, issue price and repurchase price.
 
     The Board of Directors is required to make appropriate adjustments in
connection with the 1997 Plan and any outstanding Awards to reflect stock
dividends, stock splits and certain other events. In the event of a merger,
liquidation or other Acquisition Event (as defined in the 1997 Plan), the 1997
Plan provides that the vesting of all outstanding Options or other stock-based
Awards will accelerate, making them fully exercisable prior to or upon
consummation of the Acquisition Event.
 
     If any Award expires or is terminated, surrendered, canceled or forfeited,
the unused shares of Common Stock covered by such Award will again be available
for grant under the 1997 Plan.
 
AMENDMENT OR TERMINATION
 
     No Award may be made under the 1997 Plan after March 20, 2007, but Awards
previously granted may extend beyond that date. The Board of Directors may at
any time amend, suspend or terminate the 1997 Plan, except that no outstanding
Award designated as subject to Section 162(m) of the Code by the Board of
Directors after the date of such amendment shall become exercisable, realizable
or vested (to the extent such amendment was required to grant such Award) unless
and until such amendment shall have been approved by the Company's stockholders.
 
FEDERAL INCOME TAX CONSEQUENCES
 
     The following is a summary of the United States federal income tax
consequences that generally will arise with respect to Awards granted under the
1997 Plan and with respect to the sale of Common Stock acquired under the 1997
Plan.
 
  Incentive Stock Options
 
     In general, a participant will not recognize taxable income upon the grant
or exercise of an incentive stock option. Instead, a participant will recognize
taxable income with respect to an incentive stock option only upon the sale of
Common Stock acquired through the exercise of the option ("ISO Stock"). The
exercise of an incentive stock option may, however, subject the participant to
the alternative minimum tax.
 
     Generally, the tax consequences of selling ISO Stock will vary with the
length of time that the participant has owned the ISO Stock at the time it is
sold. If the participant sells ISO Stock after having owned it for at least two
years from the date the option was granted (the "Grant Date") and one year from
the date the option was exercised (the "Exercise Date"), then the participant
will recognize long-term capital gain in an amount equal to the excess of the
sale price of the ISO Stock over the exercise price.
 
                                       20
<PAGE>   23
 
     If the participant sells ISO Stock for more than the exercise price prior
to having owned it for at least two years from the Grant Date and one year from
the Exercise Date (a "Disqualifying Disposition"), then all or a portion of the
gain recognized by the participant will be ordinary compensation income and the
remaining gain, if any, will be a capital gain. This capital gain will be a
long-term capital gain if the participant has held the ISO Stock for more than
one year prior to the date of sale.
 
     If a participant sells ISO Stock for less than the exercise price, then the
participant will recognize capital loss equal to the excess of the exercise
price over the sale price of the ISO Stock. This capital loss will be a
long-term capital loss if the participant has held the ISO Stock for more than
one year prior to the date of sale.
 
  Nonstatutory Stock Options
 
     As in the case of an incentive stock option, a participant will not
recognize taxable income upon the grant of a nonstatutory stock option. Unlike
the case of an incentive stock option, however, a participant who exercises of a
nonstatutory stock option generally will recognize ordinary compensation income
in an amount equal to the excess of the fair market value of the Common Stock
acquired through the exercise of the option ("NSO Stock") on the Exercise Date
over the exercise price.
 
     With respect to any NSO Stock, a participant will have a tax basis equal to
the exercise price plus any income recognized upon the exercise of the option.
Upon selling NSO Stock, a participant generally will recognize capital gain or
loss in an amount equal to the excess of the sale price of the NSO Stock over
the participant's tax basis in the NSO Stock. This capital gain or loss will be
a long-term gain or loss if the participant has held the NSO stock for more than
one year prior to the date of the sale.
 
  Restricted Stock Awards
 
     A participant will not recognize taxable income upon the grant of a
restricted stock Award, unless the participant makes an election under Section
83(b) of the Code (a "Section 83(b) Election"). If the participant makes a
Section 83(b) Election within 30 days of the date of the grant, then the
participant will recognize ordinary income, for the year in which the Award is
granted, in an amount equal to the difference between the fair market value of
the Common Stock at the time the Award is granted and the purchase price paid
for the Common Stock. If a Section 83(b) Election is not made, the participant
will recognize ordinary income, at the time that the forfeiture provisions or
restrictions on transfer lapse, in an amount equal to the difference between the
fair market value of the Common Stock at the time of such lapse and the original
purchase price paid for the Common Stock. The participant will have a basis in
the Common Stock acquired equal to the sum of the price paid and the amount of
ordinary compensation income recognized.
 
     Upon the disposition of the Common Stock acquired pursuant to a restricted
stock Award, the participant will recognize a capital gain or loss equal to the
difference between the sale price of the Common Stock and the participant's
basis in the Common Stock. The gain or loss will be a long-term gain or loss if
the shares are held for more than one year. For this purpose, the holding period
shall begin just after the date on which the forfeiture provisions or
restrictions lapse if a Section 83(b) Election is not made, or just after the
Award is granted if a Section 83(b) Election is made.
 
  Other Stock-Based Awards
 
     The tax consequences associated with any other stock-based Award granted
under the 1997 Plan will vary depending on the specific terms of such Award,
including whether or not the Award has a readily ascertainable fair market
value, whether or not the Award is subject to forfeiture provisions or
restrictions on transfer, the nature of the property to be received by the
participant under the Award, the applicable holding period and the participant's
tax basis.
 
                                       21
<PAGE>   24
 
  Tax Consequences to the Company
 
     The grant of an Award under the 1997 Plan will have no tax consequences to
the Company. Moreover, in general, neither the exercise of an incentive stock
option nor the sale of any Common Stock acquired under the 1997 Plan will have
any tax consequences to the Company. The Company generally will be entitled to a
business-expense deduction, however, with respect to any ordinary compensation
income recognized by a participant under the 1997 Plan, including as a result of
the exercise of a nonstatutory stock option, a Disqualifying Disposition or a
Section 83(b) Election. Any such deduction will be subject to the limitations of
Section 162(m) of the Code. The Company will have a withholding obligation with
respect to any ordinary compensation income recognized by participants under the
1997 Plan who are employees or otherwise subject to withholding in connection
with the exercise of a nonstatutory stock option or a Section 83(b) Election.
 
BOARD RECOMMENDATION
 
     The Board of Directors believes that the 1997 Stock Incentive Plan is in
the best interests of the Company and its stockholders and therefore recommends
that the stockholders vote FOR this proposal.
 
            PROPOSAL 3 -- RATIFICATION OF THE SELECTION OF AUDITORS
 
     The Board of Directors has selected Arthur Andersen LLP as auditors of the
Company for the year ending December 31, 1997, subject to ratification by
stockholders at the Meeting. If the stockholders do not ratify the selection of
Arthur Andersen LLP, the Board of Directors will reconsider the matter. A
representative of Arthur Andersen LLP, which served as auditors for the year
ended December 31, 1996, is expected to be present at the Meeting to respond to
appropriate questions, and to make a statement if he or she so desires.
 
                 STOCKHOLDER PROPOSALS FOR 1998 ANNUAL MEETING
 
     Any proposal that a stockholder intends to present at the 1998 Annual
Meeting of Stockholders must be submitted to the Secretary of the Company at its
offices, 620 Memorial Drive, Cambridge, Massachusetts 02139, no later than
December 19, 1997 in order to be considered for inclusion in the Proxy Statement
relating to that meeting.
 
                                       22
<PAGE>   25
 
                                 OTHER MATTERS
 
     The Board of Directors knows of no other business which will be presented
for consideration at the Meeting other than that described above. However, if
any other business should come before the Meeting, it is the intention of the
persons named in the enclosed Proxy to vote, or otherwise act, in accordance
with their best judgment on such matters.
 
     The Company will bear the costs of soliciting proxies. In addition to
solicitations by mail, the Company's directors, officers and regular employees
may, without additional remuneration, solicit proxies by telephone, telegraph,
facsimile and personal interviews. The Company will also request brokerage
houses, custodians, nominees and fiduciaries to forward copies of the proxy
material to those persons for whom they hold shares and request instructions for
voting the Proxies. The Company will reimburse such brokerage houses and other
persons for their reasonable expenses in connection with this distribution.
 
     THE BOARD OF DIRECTORS HOPES THAT STOCKHOLDERS WILL ATTEND THE MEETING.
WHETHER OR NOT YOU PLAN TO ATTEND, YOU ARE URGED TO COMPLETE, DATE, SIGN AND
RETURN THE ENCLOSED PROXY IN THE ACCOMPANYING ENVELOPE. PROMPT RESPONSE WILL
GREATLY FACILITATE ARRANGEMENTS FOR THE MEETING AND YOUR COOPERATION IS
APPRECIATED. STOCKHOLDERS WHO ATTEND THE MEETING MAY VOTE THEIR STOCK PERSONALLY
EVEN THOUGH THEY HAVE SENT IN THEIR PROXIES.
 
                                            By Order of the Board of Directors,
 
                                            ANTHONY J. PAYNE, Secretary
 
April 21, 1997
 
                                       23
<PAGE>   26
                                                                     Exhibit A
                                                                     ---------



                                 HYBRIDON, INC.

                            1997 STOCK INCENTIVE PLAN
                            -------------------------


1.   Purpose
     -------

     The purpose of this 1997 Stock Incentive Plan (the "Plan") of Hybridon,
Inc., a Delaware corporation (the "Company"), is to advance the interests of the
Company's stockholders by enhancing the Company's ability to attract, retain and
motivate persons who make (or are expected to make) important contributions to
the Company by providing such persons with equity ownership opportunities and
performance-based incentives and thereby better aligning the interests of such
persons with those of the Company's stockholders. Except where the context
otherwise requires, the term "Company" shall include any present or future
subsidiary corporations of the Company as defined in Section 424(f) of the
Internal Revenue Code of 1986, as amended, and any regulations promulgated
thereunder (the "Code") (a "Subsidiary").

2.   Eligibility
     -----------

     All of the Company's employees, officers, directors, consultants and
advisors are eligible to be granted options, restricted stock, or other
stock-based awards (each, an "Award") under the Plan. Any person who has been
granted an Award under the Plan shall be deemed a "Participant".

3.   Administration, Delegation
     --------------------------

     (a) ADMINISTRATION BY BOARD OF DIRECTORS. The Plan will be administered by
the Board of Directors of the Company (the "Board"). The Board shall have
authority to grant Awards and to adopt, amend and repeal such administrative
rules, guidelines and practices relating to the Plan as it shall deem advisable
from time to time. The Board may correct any defect, supply any omission or
reconcile any inconsistency in the Plan or any Award in the manner and to the
extent it shall deem expedient to carry the Plan into effect and it shall be the
sole and final judge of such expediency. No member of the Board shall be liable
for any action or determination relating to the Plan. All decisions by the Board
shall be made in the Board's sole discretion and shall be final and binding on
all persons having or claiming any interest in the Plan or in any Award. No
director or person acting pursuant to the authority delegated by the Board shall
be liable for any action or determination under the Plan made in good faith.


<PAGE>   27



     (b) DELEGATION TO EXECUTIVE OFFICERS. To the extent permitted by applicable
law, the Board may delegate to one or more executive officers of the Company the
power to make Awards and exercise such other powers under the Plan as the Board
may determine, provided that the Board shall fix the maximum number of shares
subject to Awards and the maximum number of shares for any one Participant to be
made by such executive officers.

     (c) APPOINTMENT OF COMMITTEES. To the extent permitted by applicable law,
the Board may delegate any or all of its powers under the Plan to one or more
committees or subcommittees of the Board (a "Committee"). For so long as the
common stock, $.001 par value per share (the "Common Stock"), of the Company is
registered under the Securities Exchange Act of 1934 (the "Exchange Act"), the
Board shall appoint one such Committee of not less than two members, each member
of which shall be an "outside director" within the meaning of Section 162(m) of
the Code and a "non-employee director" as defined in Rule 16b-3 promulgated
under the Exchange Act." All references in the Plan to the "Board" shall mean a
Committee or the Board or the executive officer referred to in Section 3(b) to
the extent that the Board's powers or authority under the Plan have been
delegated to such Committee or executive officer.

4.   Stock Available For Awards
     --------------------------

     (a) NUMBER OF SHARES. Subject to adjustment under Section 4(c), Awards may
be made under the Plan for up to 3,000,000 shares of Common Stock. If any Award
expires or is terminated, surrendered or canceled without having been fully
exercised or is forfeited in whole or in part or results in any Common Stock not
being issued, the unused Common Stock covered by such Award shall again be
available for the grant of Awards under the Plan, subject, however, in the case
of Incentive Stock Options (as hereinafter defined), to any limitation required
under the Code. Shares issued under the Plan may consist in whole or in part of
authorized but unissued shares or treasury shares.

     (b) PER PARTICIPANT LIMIT. Subject to adjustment under Section 4(c), the
maximum number of shares with respect to which an Award or Awards may be granted
to any Participant under the Plan shall be 500,000 per calendar year. The per
Participant limit described in this Section 4(b) shall be construed and applied
consistently with Section 162(m) of the Code.

     (c) ADJUSTMENT TO COMMON STOCK. In the event of any stock split, stock
dividend, recapitalization, reorganization, merger, consolidation, combination,
exchange of shares, liquidation, spin-off or other similar change in
capitalization or event, or any distribution to holders of Common Stock other
than a normal cash dividend, (i) the number and class of securities available
under this Plan, (ii) the number and class of security and exercise price per
share subject to each outstanding

                                       -2-

<PAGE>   28



Option (as defined below), (iii) the repurchase price per security subject to
each outstanding Restricted Stock Award (as defined below), and (iv) the terms
of each other outstanding stock-based Award shall be appropriately adjusted by
the Company (or substituted Awards may be made, if applicable) to the extent the
Board shall determine, in good faith, that such an adjustment (or substitution)
is necessary and appropriate. If this Section 4(c) applies and Section 8(e)(1)
also applies to any event, Section 8(e)(1) shall be applicable to such event,
and this Section 4(c) shall not be applicable.

5.   Stock Options
     -------------

     (a) GENERAL. The Board may grant options to purchase Common Stock (each, an
"Option") and determine the number of shares of Common Stock to be covered by
each Option, the exercise price of each Option and the conditions and
limitations applicable to the exercise of each Option, including conditions
relating to applicable federal or state securities laws, as it considers
necessary or advisable. An Option which is not intended to be an Incentive Stock
Option shall be designated a "Nonstatutory Stock Option".

     (b) INCENTIVE STOCK OPTIONS. An Option that the Board intends to be an
"incentive stock option" as defined in Section 422 of the Code (an "Incentive
Stock Option") shall only be granted to employees of the Company and shall be
subject to and construed consistently with the requirements of Section 422 of
the Code. The Company shall have no liability to a Participant, or any other
party, if an Option (or any part thereof) which is intended to be an Incentive
Stock Option is not an Incentive Stock Option.

     (c) EXERCISE PRICE. The Board shall establish the exercise price at the
time each Option is granted and specify it in the applicable option agreement.

     (d) DURATION OF OPTIONS. Each Option shall be exercisable at such times and
subject to such terms and conditions as the Board may specify in the applicable
option agreement.

     (e) EXERCISE OF OPTION. Options may be exercised only by delivery to the
Company of a written notice of exercise signed by the proper person together
with payment in full as specified in Section 5(f) for the number of shares for
which the Option is exercised.

     (f) PAYMENT UPON EXERCISE. Common Stock purchased upon the exercise of an
Option granted under the Plan shall be paid for as follows:

          (1) in cash or by check, payable to the order of the Company;


                                       -3-

<PAGE>   29



          (2) except as the Board may otherwise provide in an Option Agreement,
     delivery of an irrevocable and unconditional undertaking by a creditworthy
     broker to deliver promptly to the Company sufficient funds to pay the
     exercise price, or delivery by the Participant to the Company of a copy of
     irrevocable and unconditional instructions to a creditworthy broker to
     deliver promptly to the Company cash or a check sufficient to pay the
     exercise price;

          (3) to the extent permitted by the Board and explicitly provided in
     the Option Agreement (i) by delivery of shares of Common Stock owned by the
     Participant valued at their fair market value as determined by the Board in
     good faith ("Fair Market Value"), which Common Stock was owned by the
     Participant at least six months prior to such delivery, (ii) by delivery of
     a promissory note of the Participant to the Company on terms determined by
     the Board, or (iii) by payment of such other lawful consideration as the
     Board may determine; or

          (4) any combination of the above permitted forms of payment.

6.   Restricted Stock
     ----------------

     (a) GRANTS. The Board may grant Awards entitling recipients to acquire
shares of Common Stock, subject to the right of the Company to repurchase all or
part of such shares at their issue price or other stated or formula price (or to
require forfeiture of such shares if issued at no cost) from the recipient in
the event that conditions specified by the Board in the applicable Award are not
satisfied prior to the end of the applicable restriction period or periods
established by the Board for such Award (each, a "Restricted Stock Award").

     (b) TERMS AND CONDITIONS. The Board shall determine the terms and
conditions of any such Restricted Stock Award, including the conditions for
repurchase (or forfeiture) and the issue price, if any. Any stock certificates
issued in respect of a Restricted Stock Award shall be registered in the name of
the Participant and, unless otherwise determined by the Board, deposited by the
Participant, together with a stock power endorsed in blank, with the Company (or
its designee). At the expiration of the applicable restriction periods, the
Company (or such designee) shall deliver the certificates no longer subject to
such restrictions to the Participant or if the Participant has died, to the
beneficiary designated, in a manner determined by the Board, by a Participant to
receive amounts due or exercise rights of the Participant in the event of the
Participant's death (the "Designated Beneficiary"). In the absence of an
effective designation by a Participant, Designated Beneficiary shall mean the
Participant's estate.


                                       -4-

<PAGE>   30



7.   Other Stock-based Awards
     ------------------------

     The Board shall have the right to grant other Awards based upon the Common
Stock having such terms and conditions as the Board may determine, including the
grant of shares based upon certain conditions, the grant of securities
convertible into Common Stock and the grant of stock appreciation rights.

8.   General Provisions Applicable to Awards
     ---------------------------------------

     (a) TRANSFERABILITY OF AWARDS. Except as the Board may otherwise determine
or provide in an Award, Awards shall not be sold, assigned, transferred, pledged
or otherwise encumbered by the person to whom they are granted, either
voluntarily or by operation of law, except by will or the laws of descent and
distribution, and, during the life of the Participant, shall be exercisable only
by the Participant. References to a Participant, to the extent relevant in the
context, shall include references to authorized transferees.

     (b) DOCUMENTATION. Each Award under the Plan shall be evidenced by a
written instrument in such form as the Board shall determine. Each Award may
contain terms and conditions in addition to those set forth in the Plan.

     (c) BOARD DISCRETION. Except as otherwise provided by the Plan, each type
of Award may be made alone or in addition or in relation to any other type of
Award. The terms of each type of Award need not be identical, and the Board need
not treat Participants uniformly.

     (d) TERMINATION OF STATUS. The Board shall determine the effect on an Award
of the disability, death, retirement, authorized leave of absence or other
change in the employment or other status of a Participant and the extent to
which, and the period during which, the Participant, the Participant's legal
representative, conservator, guardian or Designated Beneficiary may exercise
rights under the Award.

     (e) Acquisition Events
         ------------------

          (1) CONSEQUENCES OF ACQUISITION EVENTS. Except to the extent otherwise
provided in the instrument evidencing the Award or in any other agreement
between the Participant and the Company:

               (A) Upon the occurrence of an Acquisition Event,

                    (i) all Restricted Stock Awards then outstanding shall
become immediately free of all restrictions; and


                                       -5-

<PAGE>   31



                    (ii) all other stock-based Awards other than Options and
stock appreciation rights shall become immediately exercisable, realizable or
vested in full, or shall be immediately free of all restrictions or conditions,
as the case may be.

               (B) Upon the execution by the Company of an agreement to effect
an Acquisition Event other than a Change of Control Event, all Options and stock
appreciation rights then outstanding shall become immediately exercisable in
full upon the occurrence of the Acquisition Event or such earlier date as may be
specified by the Board by written notice to the Participants, and the Board may
take one or both of the following actions with respect to then outstanding
Options and stock appreciation rights: (I) provide that such Options and stock
appreciation rights shall be assumed, or equivalent Options or stock
appreciation rights be substituted by the acquiring or succeeding corporation
(or an affiliate thereof), or (II) upon written notice to the Participants,
provide that all then unexercised Options and stock appreciation rights will
terminate to the extent not exercised by the Participants prior to the
consummation of such Acquisition Event or such earlier date as may be specified
by the Board by written notice to Participants.

               (C) Upon the occurrence of a Change of Control Event, all Options
and stock appreciation rights then outstanding shall become immediately
exercisable in full.

     An "Acquisition Event" shall mean: (a) any merger or consolidation which
results in the voting securities of the Company outstanding immediately prior
thereto representing (either by remaining outstanding or by being converted into
voting securities of the surviving or acquiring entity) less than 60% of the
combined voting power of the voting securities of the Company or such surviving
or acquiring entity outstanding immediately after such merger or consolidation;
(b) any sale of all or substantially all of the assets of the Company; (c) the
complete liquidation of the Company; or (d) the acquisition of "beneficial
ownership" (as defined in Rule 13d-3 under the Exchange Act) of securities of
the Company representing 50% or more of the combined voting power of the
Company's then outstanding securities (other than through a merger or
consolidation or an acquisition of securities directly from the Company) by any
"person," as such term is used in Sections 13(d) and 14(d) of the Exchange Act,
other than the Company, any trustee or other fiduciary holding securities under
an employee benefit plan of the Company or any corporation owned directly or
indirectly by the stockholders of the Company in substantially the same
proportion as their ownership of stock of the Company (an event specified in
this clause (d) being referred to as a "Change of Control Event").

          (2) ASSUMPTION OF OPTIONS UPON CERTAIN EVENTS. The Board may grant 
Awards under the Plan in substitution for stock and stock-based awards held by
employees of another corporation who become employees of the Company as a

                                       -6-

<PAGE>   32



result of a merger or consolidation of the employing corporation with the
Company or the acquisition by the Company of property or stock of the employing
corporation. The substitute Awards shall be granted on such terms and conditions
as the Board considers appropriate in the circumstances.

     (f) WITHHOLDING. Each Participant shall pay to the Company, or make
provision satisfactory to the Board for payment of, any taxes required by law to
be withheld in connection with Awards to such Participant no later than the date
of the event creating the tax liability. The Board may allow Participants to
satisfy such tax obligations in whole or in part in shares of Common Stock,
including shares retained from the Award creating the tax obligation, valued at
their Fair Market Value. The Company may, to the extent permitted by law, deduct
any such tax obligations from any payment of any kind otherwise due to a
Participant.

     (g) AMENDMENT OF AWARD. The Board may amend, modify or terminate any
outstanding Award, including but not limited to, substituting therefor another
Award of the same or a different type, changing the date of exercise or
realization, and converting an Incentive Stock Option to a Nonstatutory Stock
Option, provided that the Participant's consent to such action shall be required
unless the Board determines that the action, taking into account any related
action, would not materially and adversely affect the Participant.

     (h) CONDITIONS ON DELIVERY OF STOCK. The Company will not be obligated to
deliver any shares of Common Stock pursuant to the Plan or to remove
restrictions from shares previously delivered under the Plan until (i) all
conditions of the Award have been met or removed to the satisfaction of the
Company, (ii) in the opinion of the Company's counsel, all other legal matters
in connection with the issuance and delivery of such shares have been satisfied,
including any applicable securities laws and any applicable stock exchange or
stock market rules and regulations, and (iii) the Participant has executed and
delivered to the Company such representations or agreements as the Company may
consider appropriate to satisfy the requirements of any applicable laws, rules
or regulations.

     (i) ACCELERATION. The Board may at any time provide that any Options shall
become immediately exercisable in full or in part, that any Restricted Stock
Awards shall be free of all restrictions or that any other stock-based Awards
may become exercisable in full or in part or free of some or all restrictions or
conditions, or otherwise realizable in full or in part, as the case may be.

9.       Miscellaneous
         -------------

     (a) NO RIGHT TO EMPLOYMENT OR OTHER STATUS. No person shall have any claim
or right to be granted an Award, and the grant of an Award shall not be
construed as giving a Participant the right to continued employment or any other

                                       -7-

<PAGE>   33



relationship with the Company. The Company expressly reserves the right at any
time to dismiss or otherwise terminate its relationship with a Participant free
from any liability or claim under the Plan, except as expressly provided in the
applicable Award.

     (b) NO RIGHTS AS STOCKHOLDER. Subject to the provisions of the applicable
Award, no Participant or Designated Beneficiary shall have any rights as a
stockholder with respect to any shares of Common Stock to be distributed with
respect to an Award until becoming the record holder of such shares.

     (c) EFFECTIVE DATE AND TERM OF PLAN. The Plan shall become effective on the
date on which it is adopted by the Board, but no Award granted to a Participant
designated as subject to Section 162(m) by the Board shall become exercisable,
vested or realizable, as applicable to such Award, unless and until the Plan has
been approved by the Company's stockholders. No Awards shall be granted under
the Plan after the completion of ten years from the earlier of (i) the date on
which the Plan was adopted by the Board or (ii) the date the Plan was approved
by the Company's stockholders, but Awards previously granted may extend beyond
that date.

     (d) AMENDMENT OF PLAN. The Board may amend, suspend or terminate the Plan
or any portion thereof at any time, provided that no Award granted to a
Participant designated as subject to 162(m) by the Board after the date of such
amendment shall become exercisable, realizable or vested, as applicable to such
Award (to the extent that such amendment to the Plan was required to grant such
Award to a particular Participant), unless and until such amendment shall have
been approved by the Company's stockholders.

     (e) STOCKHOLDER APPROVAL. For purposes of this Plan, stockholder approval
shall mean approval by a vote of the stockholders in accordance with the
requirements of Section 162(m) of the Code.

     (f) GOVERNING LAW. The provisions of the Plan and all Awards made hereunder
shall be governed by and interpreted in accordance with the laws of the State of
Delaware, without regard to any applicable conflicts of law.


                                                 Adopted by the Board of
                                                 Directors on March 20,
                                                 1997.

                                                 Approved by the
                                                 stockholders of the Company
                                                 on                     .
                                                    --------------------


                                       -8-

<PAGE>   34
<TABLE>
<CAPTION>
This Proxy when properly executed will be voted in the manner directed by the undersigned stockholder(s).      Please mark    [X]
If no other indication is made, the proxies shall vote "For" proposal numbers 1, 2 and 3.                      your votes as     
                                                                                                               indicated in      
                                                                                                               this example      
                                                                              
<S>                                     <C>                                                     <C>
1) Election of Class II Directors.      Nominees: Mohamed A. El-Kherejii, Jerry A. Weisbach,    2) Approval of the adoption of the 
                                        James B. Wyngaarden and Paul C. Zamerecnik                 Company's 1997 Stock Incentive
                               For                                                                 Plan.
                               All      If you do not wish your shares voted "FOR" a particular
                                        nominee, mark the "For All Except" box and strike a          FOR    AGAINST    ABSTAIN 
         FOR   Withhold    Except       line through the nominee(s) name. Your shares will be        [ ]      [ ]       [ ]    
         [ ]     [ ]         [ ]        voted for the remaining nominee(s).

3) Ratification of selection of independent          A vote FOR the director nominees and FOR          Mark box at right if   [ ]
                                                     proposal numbers 2 and 3 is recommended           comments or address
                                                     by the Board of Directors.                        change have been noted
         FOR    AGAINST    ABSTAIN                                                                     on the reverse side
         [ ]      [ ]       [ ]                                                                        of this card.

                                                                                       Please be sure to sign and date this Proxy.
                                                                              ------
                                                                                       Please sign this proxy exactly as your name 
                                                                                       appears hereon. Joint owners should each sign
                                                                                       personally. Trustees and other fiduciaries
                                                                                       should indicate the capacity in which they 
                                                                                       sign. If a corporation or partnership, this
                                                                                       signature should be that of an authorized
                                                                                       officer who should state his or her title.

                                                                                       Date:
                                                                                            ---------------------------------------

                                                                                       --------------------------------------------
                                                                                       Stockholder sign here     Co-owner sign here

                                                                                       PLEASE VOTE, DATE AND SIGN ON OTHER SIDE AND
                                                                                       RETURN PROMPTLY IN ENCLOSED ENVELOPE.
</TABLE>

- -------------------------------------------------------------------------------
                            *FOLD AND DETACH HERE*


                                HYBRIDON, INC.


Dear Stockholder:

Please take note of the important information enclosed with this Proxy Ballot.
There are a number of issues related to the management and operation of your
Company that require you immediate attention and approval. These are discussed
in the enclosed proxy materials.

Your vote counts, and you are strongly encouraged to exercise your right to
vote your shares.

Please mark the boxes on the proxy card to indicate how your shares shall be
voted. Then sign and date the card, detach it and return your proxy vote in the
enclosed postage paid envelope.

Your vote must be received prior to the Annual Meeting of Stockholders to be
held on May 19, 1997.

Thank you in advance for your prompt consideration of these matters.

Sincerely,

Hybridon, Inc.






<PAGE>   35
                                HYBRIDON, INC.

                  PROXY SOLICITED BY THE BOARD OF DIRECTORS
                Annual Meeting of Stockholders - May 19, 1997


Those signing on the reverse side , revoking prior proxies, hereby appoint(s)
E. Andrews Grinstead, III, Anthony J. Payne and David E. Redlick, or each or
any of them with full power os substitution, as proxies for those signing on
the reverse side to act and vote all shares of stock of Hybridon, Inc. (the
"Company") which the undersigned would be entitled to vote if personally
present at the 1997 Annual Meeting of Stockholders of the Company and at any
adjournments thereof as indicated upon all matters referred to on the reverse
side and described in the Proxy Statement for the Meeting, and, in their
discretion, upon any other matters which may properly come before the Meeting.
Attendance of the undersigned at the Meeting or at any adjournment thereof will
not be deemed to revoke this proxy unless those signing on the reverse side
shall revoke this proxy in writing.


HAS YOUR ADDRESS CHANGED?                      DO YOU HAVE ANY COMMENTS?

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                            *FOLD AND DETACH HERE*



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