HYBRIDON INC
S-8, 2000-04-04
BIOLOGICAL PRODUCTS, (NO DIAGNOSTIC SUBSTANCES)
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As filed with the Securities and Exchange Commission on April 4, 2000.
                                                         Registration No. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                 ---------------
                                    FORM S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                                 ---------------
                                 HYBRIDON, INC.
             (Exact name of registrant as specified in its charter)

      Delaware                                                 04-3072298
- ------------------------                                 ----------------------
(State or Other Jurisdiction of                            (I.R.S. Employer
Incorporation or Organization)                           Identification Number)


                              155 Fortune Boulevard
                          Milford, Massachusetts 01757
                    (Address of Principal Executive Offices)
                           --------------------------

                                 HYBRIDON, INC.
                            1997 STOCK INCENTIVE PLAN
                            (Full Title of the Plan)


                                 Sudhir Agrawal
                  President and Acting Chief Executive Officer
                                 Hybridon, Inc.
                              155 Fortune Boulevard
                          Milford, Massachusetts 01757
                     (Name and Address of Agent for Service)


                                 (508) 482-7500
                     (Telephone Number, Including Area Code,
                              of Agent for Service)

                                   Copies to:

                              Monica C. Lord, Esq.
                       Kramer Levin Naftalis & Frankel LLP
                                919 Third Avenue
                            New York, New York 10022
                                 (212) 715-9100

In addition, pursuant to Rule 416(c) under the Securities Act of 1933, this
registration statement also covers an indeterminate amount of interests to be
offered or sold pursuant to the employee benefit plan described herein.

<PAGE>

                         CALCULATION OF REGISTRATION FEE

- --------------------------------------------------------------------------------
                                         Proposed  Proposed
                                         Maximum    Maximum
                                         Offering  Aggregate     Amount of
 Title of Securities   Amount to be     Price Per  Offering    Registration
  to be Registered      Registered        Share      Price         Fee
- --------------------------------------------------------------------------------
Common Stock, par     6,125 shares(1)      $2.00      $12,250        $3.23
value $.001  per      4,396,716 shares(2)  $0.50      $2,198,358     $580.37
share                 2,000 shares(3)      $3.75      $7,500         $1.98
                      2,095,159 shares     $2.25(4)   $4,714,107.75  $1244.52
- --------------------------------------------------------------------------------

(1)   Representing options having an exercise price-per-share of $2.00.

(2)   Representing options having an exercise price-per-share of $0.50.

(3)   Representing options having an exercise price-per-share of $3.75.

(4)   Estimated solely for purposes of calculating the registration fee pursuant
      to Rule 457(c) under the Securities Act of 1933, as amended, based upon
      the average of the high and low sales prices for the Common Stock reported
      on the Nasdaq OTC Bulletin Board on March 31, 2000.


                                       -2-
<PAGE>

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.   Incorporation of Documents by Reference.

      The Registrant hereby incorporates by reference in this Registration
Statement the following documents:

      (a) The Registrant's Annual Report on Form 10-K for the fiscal year ended
December 31, 1999 (File No. 0-27352), filed March 30, 2000 pursuant to Section
13 or 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act").

      (b) The Registrant's Current Report on Form 8-K, filed February 15, 2000
pursuant to Section 13(a) of the Exchange Act.

      (c) The description of the common stock of the Registrant, par value $.001
per share contained in the Registrant's Registration Statement on Form 8-A filed
under the Exchange Act, including any amendment or report filed for the purpose
of updating such description.

      All documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a
post-effective amendment to this Registration Statement which indicates that all
securities offered hereby have been sold or which deregisters all such
securities then remaining unsold, shall be deemed to be incorporated by
reference in this Registration Statement and to be a part hereof from the date
of filing of such documents.

Item 4.   Description of Securities.

      Not applicable.

Item 5.   Interest of Named Experts and Counsel.

      Not applicable.

Item 6.   Indemnification of Directors and Officers.

      Reference is made to Section 102(b)(7) of the Delaware General Corporation
Law (the "DGCL"), which permits a corporation in its certificate of
incorporation or an amendment thereto to eliminate or limit the personal
liability of a director for violations of the director's fiduciary duty, except
(i) for any breach of the director's fiduciary duty of loyalty to the
corporation or its stockholders, (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, (iii)
pursuant to Section 174 of the DGCL (providing for liability of directors for
unlawful payment of dividends or unlawful stock purchases or redemptions), or
(iv) for any transaction from which the director derived an improper personal
benefit. The Registrant's Amended and Restated Certificate of Incorporation, as
amended, contains provisions permitted by Section 102(b)(7) of the DGCL.

      Reference is made to Section 145 of the DGCL which provides that a
corporation may indemnify any persons, including directors and officers, who
are, or are threatened to be made, parties to any threatened, pending or
completed legal action, suit or proceeding, whether civil, criminal,
administrative or investigative (other than an action by or in the right of such
corporation), by reason of the fact that such person is or was a director,
officer, employee or agent of such corporation, or is or was serving at the
request of such corporation as a director, officer, employee or agent of another
corporation or enterprise. The indemnity may include expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred by such person in connection with such action, suit or
proceeding, provided such director, officer, employee or agent acted in good


                                      -3-
<PAGE>

faith and in a manner he reasonably believed to be in or not opposed to the
corporation's best interests and, with respect to any criminal action or
proceedings, had no reasonable cause to believe that his conduct was unlawful. A
Delaware corporation may indemnify directors and/or officers in an action or
suit by or in the right of the corporation under the same conditions, except
that no indemnification is permitted without judicial approval if the director
or officer is adjudged to be liable to the corporation. Where a director or
officer is successful on the merits or otherwise in the defense of any action
referred to above, the corporation must indemnify him or her against the
expenses which such director or officer actually and reasonably incurred.

      The Registrant's Amended and Restated Certificate of Incorporation, as
amended, provides for indemnification of directors and officers of the
Registrant to the fullest extent permitted by the DGCL. The Registrant also
maintains liability insurance for each director and officer for certain losses
arising from claims or charges made against them while acting in their
capacities as directors or officers of the Registrant.

Item 7.   Exemption from Registration Claimed.

      Not applicable.

Item 8.    Exhibits.

            Exhibit Number       Description
            --------------       -----------

                  4.1      Restated Certificate of Incorporation of the
                           Registrant, as amended (incorporated by reference to
                           Exhibit 3.1 filed as part of the Registrant's Annual
                           Report on Form 10-K for the year ended December 31,
                           1997).

                  4.2      Amended and Restated By-laws of the Registrant
                           (incorporated by reference to Exhibits to the
                           Registrant's Registration Statement on Form S-1, File
                           No. 33-99024).

                  4.3      Forms of Option Agreement.

                  5        Opinion of Kramer Levin Naftalis & Frankel LLP
                           regarding legality of securities being registered
                           (including consent).

                  23.1     Consent of Arthur Andersen LLP.

                  23.2     Consent of Kramer Levin Naftalis & Frankel LLP (see
                           Exhibit Number 5 above).

                  24       Power of Attorney (contained in the signature page of
                           this Registration Statement).

Item 9.    Undertakings.

         The undersigned Registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment to this Registration Statement to include any
material information with respect to the plan of distribution not previously
disclosed in the Registration Statement or any material change to such
information in the Registration Statement.


                                      -4-
<PAGE>

         (2) That, for the purpose of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at the time shall be deemed to be the initial bona
fide offering thereof.

         (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the Registration Statement shall be deemed to be a
new Registration Statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

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


                                      -5-
<PAGE>

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the city of Milford, Commonwealth of Massachusetts on this 29th
of February, 2000.

                                     HYBRIDON, INC.


                                     By:   /s/ Sudhir Agrawal
                                     Name: Sudhir Agrawal
                                     Title: President
                                            and Acting Chief Executive Officer


                                      -6-
<PAGE>

                        SIGNATURES AND POWER OF ATTORNEY

           The undersigned officers and directors of Hybridon, Inc. hereby
constitute and appoint Robert G. Andersen the true and lawful agent and
attorney-in-fact of the undersigned with full power and authority to sign for
the undersigned in their names, in any and all capacities, any and all
amendments (including post-effective amendments) to this Registration Statement
and generally to take all such steps as may be necessary or appropriate to
enable Hybridon, Inc. to comply with the provisions of the Securities Act of
1933, as amended, and all requirements of the Securities and Exchange Commission
related thereto, hereby ratifying and confirming all acts taken by such agents
and attorneys-in-fact, as herein authorized.

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.

              Signature                          Title(s)                Date
              ---------                          --------                ----

/s/ Sudhir Agrawal                  President, Acting Chief      Feb. 29 , 2000
- -----------------------------       Executive Officer
Dr. Sudhir Agrawal                  (Principal Executive
                                    Officer) and Director

/s/ James B. Wyngaarden             Chairman of the Board and    Feb. 29 , 2000
- -----------------------------       Director
Dr. James B. Wyngaarden

- -----------------------------       Chief Executive Officer
E. Andrews Grinstead III            and Director

/s/ Robert G. Andersen              Chief Financial Officer      Feb. 29, 2000
- -----------------------------       (Principal Accounting
Mr. Robert G. Andersen              Officer)and Vice
                                    President of Operations
                                    and Planning

/s/ Nasser Menhall                  Director                     Feb. 29, 2000
- -------------------------------
Mr. Nasser Menhall

/s/ Paul C. Zamecnik                Director                     Feb. 29, 2000
- -------------------------------
Dr. Paul C. Zamecnik

/s/ Youssef El-Zein                 Director                     March 2 , 2000
- -------------------------------
Mr. Youssef El-Zein

/s/ Arthur W.  Berry                Director                     Feb. 29 , 2000
- -------------------------------
Mr. Arthur W. Berry

/s/ Harold L. Purkey                Director                     Feb. 29 , 2000
- -------------------------------
Mr. Harold L. Purkey

/s/ Camille A. Chebeir              Director                     Feb. 29 ,  2000
- -------------------------------
Camille A. Chebeir


                                      -7-
<PAGE>

           Pursuant to the requirements of the Securities Act of 1933, the
trustees (or other persons who administer the employee benefit plan) have duly
caused this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the city of Milford, Commonwealth of
Massachusetts, on the dates set forth below.

                    Hybridon, Inc. 1997 Stock Incentive Plan

       Signature                   Title(s)                            Date

/s/ Sudhir Agrawal               President, Acting Chief           Feb. 29, 2000
- ---------------------------      Executive Officer (Principal
Dr. Sudhir Agrawal               Executive Officer) and Director

/s/ James B. Wyngaarden          Chairman of the Board             Feb. 29, 2000
- ---------------------------      and Director
Dr. James B. Wyngaarden
                                 Chief Executive Officer
- ---------------------------      and Director
E. Andrews Grinstead III

/s/ Nasser Menhall               Director                          Feb. 29, 2000
- ---------------------------
Mr. Nasser Menhall

/s/ Paul C. Zamecnik             Director                          Feb. 29, 2000
- ---------------------------
Dr. Paul C. Zamecnik

/s/ Youssef El-Zein              Director                          March 2, 2000
- ---------------------------
Mr. Youssef El-Zein

/s/ Arthur W. Berry              Director                          Feb. 29, 2000
- ---------------------------
Mr. Arthur W. Berry

/s/ Harold L. Purkey             Director                          Feb. 29, 2000
- ---------------------------
Mr. Harold L. Purkey

/s/ Camille A. Chebeir           Director                          Feb. 29, 2000
- ---------------------------
Camille A. Chebeir


                                      -8-
<PAGE>

                                  EXHIBIT INDEX


      Exhibit Number                            Description
      --------------                            -----------

         4.1      Restated Certificate of Incorporation of the Registrant, as
                  amended (incorporated by reference to Exhibit 3.1 filed as
                  part of the Registrant's Annual Report on Form 10-K for the
                  year ended December 31, 1997).

         4.2      Amended and Restated By-laws of the Registrant (incorporated
                  by reference to Exhibits to the Registrant's Registration
                  Statement on Form S-1, File No. 33-99024).

         4.3      Forms of Option Agreement.

         5        Opinion of Kramer Levin Naftalis & Frankel LLP regarding
                  legality of securities being registered (including consent).

         23.1     Consent of Arthur Andersen LLP.

         23.2     Consent of Kramer Levin Naftalis & Frankel LLP (see Exhibit
                  Number 5 above).

         24       Power of Attorney (contained on the signature page of this
                  Registration Statement).


                                      -9-
<PAGE>

                                                                     EXHIBIT 4.3

                                 HYBRIDON, INC.

                        INCENTIVE STOCK OPTION AGREEMENT
                     GRANTED UNDER 1997 STOCK INCENTIVE PLAN

1.    Grant of Option.

      This agreement evidences the grant by Hybridon, Inc, a Delaware
corporation (the "Company"), on __________, 200_ (the "Grant Date") to [ ], an
employee of the Company (the "Participant"), of an option to purchase, in whole
or in part, on the terms provided herein and in the Company's 1997 Stock
Incentive Plan (the "Plan"), a total of [ ] shares (the "Shares") of common
stock, $.001 par value per share, of the Company ("Common Stock") at $______ per
Share. Unless earlier terminated, this option shall expire on ________, 201__
[ten years from date of grant](the "Final Exercise Date").

      It is intended that the option evidenced by this agreement shall be an
incentive stock option as defined in Section 422 of the Internal Revenue Code of
1986, as amended and any regulations promulgated thereunder (the "Code"). Except
as otherwise indicated by the context, the term "Participant", as used in this
option, shall be deemed to include any person who acquires the right to exercise
this option validly under its terms.

2.    Vesting Schedule.

      This option will become exercisable ("vest") as follows:
__________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
__________________

      The right of exercise shall be cumulative so that to the extent the option
is not exercised in any period to the maximum extent permissible it shall
continue to be exercisable, in whole or in part, with respect to all shares for
which it is vested until the earlier of the Final Exercise Date or the
termination of this option under Section 3 hereof or the Plan.

3.    Exercise of Option.

      (a) Form of Exercise. Each election to exercise this option shall be in
writing, signed by the Participant, and received by the Company at its principal
office, accompanied by this


                                      -10-
<PAGE>

agreement, and payment in full in the manner provided in the Plan. The
Participant may purchase less than the number of shares covered hereby, provided
that no partial exercise of this option may be for any fractional share or for
fewer than ten whole shares.

      (b) Continuous Relationship with the Company Required. Except as otherwise
provided in this Section 3, this option may not be exercised unless the
Participant, at the time he or she exercises this option, is, and has been at
all times since the Grant Date, an employee, officer or director of, or
consultant or advisor to, the Company or any parent or subsidiary of the Company
as defined in Section 424(e) or (f) of the Code (an "Eligible Participant").

      (c) Termination of Relationship with the Company. If the Participant
ceases to be an Eligible Participant for any reason, then, except as provided in
paragraphs (d) and (e) below, the right to exercise this option shall terminate
three months after such cessation (but in no event after the Final Exercise
Date), provided that this option shall be exercisable only to the extent that
the Participant was entitled to exercise this option on the date of such
cessation. Notwithstanding the foregoing, if the Participant, prior to the Final
Exercise Date, violates the non-competition or confidentiality provisions of any
employment contract, confidentiality and nondisclosure agreement or other
agreement between the Participant and the Company, the right to exercise this
option shall terminate immediately upon written notice to the Participant from
the Company describing such violation.

      (d) Exercise Period Upon Death or Disability. If the Participant dies or
becomes disabled (within the meaning of Section 22(e)(3) of the Code) prior to
the Final Exercise Date while he or she is an Eligible Participant and the
Company has not terminated such relationship for "cause" as specified in
paragraph (e) below, this option shall be exercisable, within the period of one
year following the date of death or disability of the Participant by the
Participant, provided that this option shall be exercisable only to the extent
that this option was exercisable by the Participant on the date of his or her
death or disability, and further provided that this option shall not be
exercisable after the Final Exercise Date.

      (e) Discharge for Cause. If the Participant, prior to the Final Exercise
Date, is discharged by the Company for "cause" (as defined below), the right to
exercise this option shall terminate immediately upon the effective date of such
discharge. "Cause" shall mean willful misconduct by the Participant or willful
failure by the Participant to perform his or her responsibilities to the Company
(including, without limitation, breach by the Participant of any provision of
any employment, consulting, advisory, nondisclosure, non-competition or other
similar agreement between the Participant and the Company), as determined by the
Company, which determination shall be conclusive. The Participant shall be
considered to have been discharged for "Cause" if the Company determines, within
30 days after the Participant's resignation, that discharge for cause was
warranted.

4.    Right of First Refusal.

      (a) If the Participant proposes to sell, assign, transfer, pledge,
hypothecate or otherwise dispose of, by operation of law or otherwise
(collectively, "transfer") any Shares


                                      -11-
<PAGE>

acquired upon exercise of this option, then the Participant shall first give
written notice of the proposed transfer (the "Transfer Notice") to the Company.
The Transfer Notice shall name the proposed transferee and state the number of
such Shares the Participant proposes to transfer (the "Offered Shares"), the
price per share and all other material terms and conditions of the transfer.

      (b) For 30 days following its receipt of such Transfer Notice, the Company
shall have the option to purchase all (but not less than all) of the Offered
Shares at the price and upon the terms set forth in the Transfer Notice. In the
event the Company elects to purchase all of the Offered Shares, it shall give
written notice of such election to the Participant within such 30-day period.
Within 10 days after his receipt of such notice, the Participant shall tender to
the Company at its principal offices the certificate or certificates
representing the Offered Shares, duly endorsed in blank by the Participant or
with duly endorsed stock powers attached thereto, all in a form suitable for
transfer of the Offered Shares to the Company. Upon receipt of such certificate
or certificates, the Company shall deliver or mail to the Participant a check in
payment of the purchase price for the Offered Shares; provided that if the terms
of payment set forth in the Transfer Notice were other than cash against
delivery, the Company may pay for the Offered Shares on the same terms and
conditions as were set forth in the Transfer Notice.

      (c) At and after the time at which the Offered Shares are required to be
delivered to the Company for transfer to the Company pursuant to subsection (b)
above, the Company shall not pay any dividend to the Participant on account of
such Shares or permit the Participant to exercise any of the privileges or
rights of a stockholder with respect to such Offered Shares, but shall, in so
far as permitted by law, treat the Company as the owner of such Offered Shares.

      (d) If the Company does not elect to acquire all of the Offered Shares,
the Participant may, within the 30-day period following the expiration of the
option granted to the Company under subsection (b) above, transfer the Offered
Shares to the proposed transferee, provided that such transfer shall not be on
terms and conditions more favorable to the transferee than those contained in
the Transfer Notice. Notwithstanding any of the above, all Offered Shares
transferred pursuant to this Section 4 shall remain subject to the right of
first refusal set forth in this Section 4 and such transferee shall, as a
condition to such transfer, deliver to the Company a written instrument
confirming that such transferee shall be bound by all of the terms and
conditions of this Section 4.

      (e) The following transactions shall be exempt from the provisions of this
Section 4:

                  (1) any transfer of Shares to or for the benefit of any
         spouse, child or grandchild of the Participant, or to a trust for their
         benefit;

                  (2) any transfer pursuant to an effective registration
         statement filed by the Company under the Securities Act of 1933, as
         amended (the "Securities Act"); and

                  (3) any transfer of the Shares pursuant to the sale of all or
         substantially all of the business of the Company;


                                      -12-
<PAGE>

provided, however, that in the case of a transfer pursuant to clause (1) above,
such Shares shall remain subject to the right of first refusal set forth in this
Section 4 and such transferee shall, as a condition to such transfer, deliver to
the Company a written instrument confirming that such transferee shall be bound
by all of the terms and conditions of this Section 4.

      (f) The Company may assign its rights to purchase Offered Shares in any
particular transaction under this Section 4 to one or more persons or entities.

      (g) The provisions of this Section 4 shall terminate upon the earlier of
the following events:

            (1) the closing of the sale of shares of Common Stock in an
      underwritten public offering pursuant to an effective registration
      statement filed by the Company under the Securities Act; or

            (2) the sale of all or substantially all of the capital stock,
      assets or business of the Company, by merger, consolidation, sale of
      assets or otherwise.

      (h) The Company shall not be required (a) to transfer on its books any of
the Shares which shall have been sold or transferred in violation of any of the
provisions set forth in this Section 4, or (b) to treat as owner of such Shares
or to pay dividends to any transferee to whom any such Shares shall have been so
sold or transferred.

5.    Withholding.

      No Shares will be issued pursuant to the exercise of this option unless
and until the Participant pays to the Company, or makes provision satisfactory
to the Company for payment of, any federal, state or local withholding taxes
required by law to be withheld in respect of this option.

6.    Nontransferability of Option.

      This option may not be sold, assigned, transferred, pledged or otherwise
encumbered by the Participant, either voluntarily or by operation of law, except
by will or the laws of descent and distribution, and, during the lifetime of the
Participant, this option shall be exercisable only by the Participant.

7.    Disqualifying Disposition.

      If the Participant disposes of Shares acquired upon exercise of this
option within two years from the Grant Date or one year after such Shares were
acquired pursuant to exercise of this option, the Participant shall notify the
Company in writing of such disposition.

8.    Provisions of the Plan.


                                      -13-
<PAGE>

      This option is subject to the provisions of the Plan, a copy of which is
furnished to the Participant with this option.

      IN WITNESS WHEREOF, the Company has caused this option to be executed
under its corporate seal by its duly authorized officer. This option shall take
effect as a sealed instrument.


                                    HYBRIDON, INC.


Dated: ___________, 200_            By:   _____________________________

                                    Name: _____________________________

                                    Title:      _____________________________


                                      -14-
<PAGE>

                            PARTICIPANT'S ACCEPTANCE



      The undersigned hereby accepts the foregoing option and agrees to the
terms and conditions thereof. The undersigned hereby acknowledges receipt of a
copy of the Company's 1997 Stock Incentive Plan.

                                  PARTICIPANT:



                                    _____________________________________


                                    Address: _________________________________

                                             __________________________________


                                      -15-
<PAGE>

                                 HYBRIDON, INC.

                       Nonstatutory Stock Option Agreement
                     Granted Under 1997 Stock Incentive Plan


1.    Grant of Option.

      This agreement evidences the grant by Hybridon, Inc., a Delaware
corporation (the "Company"), on _______________, 200_ (the "Grant Date") to [ ],
[an employee] [a consultant] [a director] of the Company (the "Participant"), of
an option to purchase, in whole or in part, on the terms provided herein and in
the Company's 1997 Stock Incentive Plan (the "Plan"), a total of [ ] shares (the
"Shares") of common stock, $.001 par value per share, of the Company ("Common
Stock") at $_______ per Share. Unless earlier terminated, this option shall
expire on __________, 201_ [ten years from date of grant] (the "Final Exercise
Date").

      It is intended that the option evidenced by this agreement shall not be an
incentive stock option as defined in Section 422 of the Internal Revenue Code of
1986, as amended and any regulations promulgated thereunder (the "Code"). Except
as otherwise indicated by the context, the term "Participant", as used in this
option, shall be deemed to include any person who acquires the right to exercise
this option validly under its terms.

2.    Vesting Schedule.

      This option will become exercisable ("vest") as follows: ________________
_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________________

3.    Exercise of Option.

      (a) Form of Exercise. Each election to exercise this option shall be in
writing, signed by the Participant, and received by the Company at its principal
office, accompanied by this agreement, and payment in full in the manner
provided in the Plan. The Participant may purchase less than the number of
shares covered hereby, provided that no partial exercise of this option may be
for any fractional share or for fewer than ten whole shares.

      (b) Continuous Relationship with the Company Required. Except as otherwise
provided in this Section 3, this option may not be exercised unless the
Participant, at the time he or she exercises this option, is, and has been at
all times since the Grant Date, an employee, officer or


                                      -16-
<PAGE>

director of, or consultant or advisor to, the Company or any parent or
subsidiary of the Company as defined in Section 424(e) or (f) of the Code (an
"Eligible Participant").

      (c) Termination of Relationship with the Company. If the Participant
ceased to be an Eligible Participant for any reason, then, except as provided in
paragraphs (d) and (e) below, the right to exercise this option shall terminate
three months after such cessation (but in no event after the Final Exercise
Date), provided that this option shall be exercisable only to the extent that
the Participant was entitled to exercise this option on the date of such
cessation. Notwithstanding the foregoing, if the Participant, prior to the Final
Exercise Date, violates the non-competition or confidentiality provisions of any
employment contract, confidentiality and nondisclosure agreement or other
agreement between the Participant and the Company, the right to exercise this
option shall terminate immediately upon written notice to the Participant from
the Company describing such violation.

      (d) Exercise Period Upon Death or Disability. If the Participant dies or
becomes disabled (within the meaning of Section 22(e)(3) of the Code) prior to
the Final Exercise Date while he or she is an Eligible Participant and the
Company has not terminated such relationship for "cause" as specified in
paragraph (e) below, this option shall be exercisable, within the period of one
year following the date of death or disability of the Participant, by the
Participant, provided that this option shall be exercisable only to the extent
that this option was exercisable by the Participant on the date of his or her
death or disability, and further provided that this option shall not be
exercisable after the Final Exercise Date.

      (e) Discharge for Cause. If the Participant, prior to the Final Exercise
Date, is discharged by the Company for "cause" (as defined below), the right to
exercise this option shall terminate immediately upon the effective date of such
discharge. "Cause" shall mean willful misconduct by the Participant or willful
failure by the Participant to perform his or her responsibilities to the Company
(including, without limitation, breach by the Participant of any provision of
any employment, consulting, advisory, nondisclosure, non-competition or other
similar agreement between the Participant and the Company), as determined by the
Company, which determination shall be conclusive. The Participant shall be
considered to have been discharged for "Cause" if the Company determines, within
30 days after the Participant's resignation, that discharge for cause was
warranted.

4.    Right of First Refusal.

      (a) If the Participant proposes to sell, assign, transfer, pledge,
hypothecate or otherwise dispose of, by operation of law or otherwise
(collectively, "transfer") any Shares acquired upon exercise of this option,
then the Participant shall first give written notice of the proposed transfer
(the "Transfer Notice") to the Company. The Transfer Notice shall name the
proposed transferee and state the number of such Shares the Participant proposes
to transfer (the "Offered Shares"), the price per share and all other material
terms and conditions of the transfer.


                                      -17-
<PAGE>

      (b) For 30 days following its receipt of such Transfer Notice, the Company
shall have the option to purchase all (but not less than all) of the Offered
Shares at the price and upon the terms set forth in the Transfer Notice. In the
event the Company elects to purchase all of the Offered Shares, it shall give
written notice of such election to the Participant within such 30-day period.
Within 10 days after his receipt of such notice, the Participant shall tender to
the Company at its principal offices the certificate or certificates
representing the Offered Shares, duly endorsed in blank by the Participant or
with duly endorsed stock powers attached thereto, all in a form suitable for
transfer of the Offered Shares to the Company. Upon receipt of such certificate
or certificates, the Company shall deliver or mail to the Participant a check in
payment of the purchase price for the Offered Shares; provided that if the terms
of payment set forth in the Transfer Notice were other than cash against
delivery, the Company may pay for the Offered Shares on the same terms and
conditions as were set forth in the Transfer Notice.

      (c) At and after the time at which the Offered Shares are required to be
delivered to the Company for transfer to the Company pursuant to subsection (b)
above, the Company shall not pay any dividend to the Participant on account of
such Shares or permit the Participant to exercise any of the privileges or
rights of a stockholder with respect to such Offered Shares, but shall, in so
far as permitted by law, treat the Company as the owner of such Offered Shares.

      (d) If the Company does not elect to acquire all of the Offered Shares,
the Participant may, within the 30-day period following the expiration of the
option granted to the Company under subsection (b) above, transfer the Offered
Shares to the proposed transferee, provided that such transfer shall not be on
terms and conditions more favorable to the transferee than those contained in
the Transfer Notice. Notwithstanding any of the above, all Offered Shares
transferred pursuant to this Section 4 shall remain subject to the right of
first refusal set forth in this Section 4 and such transferee shall, as a
condition to such transfer, deliver to the Company a written instrument
confirming that such transferee shall be bound by all of the terms and
conditions of this Section 4.

      (e) The following transactions shall be exempt from the provisions of this
Section 4:

            (1) any transfer of Shares to or for the benefit of any spouse,
child or grandchild of the Participant, or to a trust for their benefit;

            (2) any transfer pursuant to an effective registration statement
filed by the Company under the Securities Act of 1933, as amended (the
"Securities Act"); and

            (3) any transfer of the Shares pursuant to the sale of all or
substantially all of the business of the Company;

provided, however, that in the case of a transfer pursuant to clause (1) above,
such Shares shall remain subject to the right of first refusal set forth in this
Section 4 and such transferee shall, as a


                                      -18-
<PAGE>

condition to such transfer, deliver to the Company a written instrument
confirming that such transferee shall be bound by all of the terms and
conditions of this Section 4.

      (f) The Company may assign its rights to purchase Offered Shares in any
particular transaction under this Section 4 to one or more persons or entities.

      (g) The provisions of this Section 4 shall terminate upon the earlier of
the following events:

            (4) the closing of the sale of shares of Common Stock in an
underwritten public offering pursuant to an effective registration statement
filed by the Company under the Securities Act; or

            (5) the sale of all or substantially all of the capital stock,
assets or business of the Company, by merger, consolidation, sale of assets or
otherwise.

      (h) The Company shall not be required (a) to transfer on its books any of
the Shares which shall have been sold or transferred in violation of any of the
provisions set forth in this Section 4, or (b) to treat as owner of such Shares
or to pay dividends to any transferee to whom any such Shares shall have been so
sold or transferred.

5.    Withholding.

      No Shares will be issued pursuant to the exercise of this option unless
and until the Participant pays to the Company, or makes provision satisfactory
to the Company for payment of, any federal, state or local withholding taxes
required by law to be withheld in respect of this option.

6.    Nontransferability of Option.

      This option may not be sold, assigned, transferred, pledged or otherwise
encumbered by the Participant, either voluntarily or by operation of law, except
by will or the laws of descent and distribution, and, during the lifetime of the
Participant, this option shall be exercisable only by the Participant.

7.    Provisions of the Plan.

      This option is subject to the provisions of the Plan, a copy of which is
furnished to the Participant with this option.

      IN WITNESS WHEREOF, the Company has caused this option to be executed
under its corporate seal by its duly authorized officer. This option shall take
effect as a sealed instrument.


                                      -19-
<PAGE>

                                    HYBRIDON, INC.


Dated:      ___________, 200_       By:   _________________________

                                    Name: _________________________

                                    Title:      ___________________


                                      -20-
<PAGE>

                            PARTICIPANT'S ACCEPTANCE

      The undersigned hereby accepts the foregoing option and agrees to the
terms and conditions thereof. The undersigned hereby acknowledges receipt of a
copy of the Company's 1997 Stock Incentive Plan.

                                  PARTICIPANT:

                                    _______________________________

                                    Address: ____________________________

                                             ____________________________


                                      -21-


                                                                       EXHIBIT 5

                       KRAMER LEVIN NAFTALIS & FRANKEL LLP

                                919 THIRD AVENUE

                           NEW YORK, N.Y. 10022 - 3852


   TEL (212) 715-9100                                      47, Avenue Hoche
   FAX (212) 715-8000                                         75008 Paris
                                                                France

                                 March 31, 2000


Hybridon, Inc.
155 Fortune Boulevard
Milford, Massachusetts  01757

                  Re:   Registration Statement on Form S-8

Ladies and Gentlemen:

            We have acted as counsel to Hybridon, Inc., a Delaware corporation
(the "Registrant"), in connection with the preparation and filing of a
Registration Statement on Form S-8 (the "Registration Statement") with the
Securities and Exchange Commission (the "Commission"), with respect to the
registration under the Securities Act of 1933, as amended (the "Act"), of an
aggregate of 6,500,000 shares (the "Shares") of common stock, par value $0.001
per share ("Common Stock"), to be issued pursuant to the Registrant's Hybridon,
Inc. 1997 Stock Incentive Plan, as amended (the "Plan").

            In connection with the registration of the Shares, we have reviewed
copies of the Registration Statement, the Plan, the Restated Certificate of
Incorporation, as amended, of the Registrant and the Amended and Restated
By-laws of the Registrant, and such documents and records as we have deemed
necessary to enable us to express an opinion on the matters covered hereby.

            We have also examined and relied upon representations, statements,
or certificates of public officials and officers and representatives of the
Registrant.

            Based upon the foregoing, we are of the opinion that the Shares
covered by the Registration Statement, following the granting of the options and
other stock-based awards described in the Plan and upon delivery of such Shares
and payment therefor at the prices and in accordance with the terms stated in
the Plan will be validly issued, fully paid and non-assessable.

            We hereby consent to the use of this opinion as an exhibit to the
Registration Statement. In giving the foregoing consent, we do not thereby admit
that we are in the category of persons whose consent is required under Section 7
of the Act or the rules and regulations of the Commission thereunder.

            We are delivering this opinion to the Registrant, and no person
other than the Registrant may rely upon it.

                                    Very truly yours,



                                    /s/ Kramer Levin Naftalis & Frankel LLP







                                                                    EXHIBIT 23.1



                        INDEPENDENT ACCOUNTANTS' CONSENT


      As independent public accountants, we hereby consent to the use of our
report and to all references to our Firm included in or made a part of this
Registration Statement.

ARTHUR ANDERSEN, LLP


Boston, Massachusetts
April 3, 2000



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