Document:

Exhibit 10.8

MOMENTA PHARMACEUTICALS, INC.

Restricted Stock Agreement

Granted Under 2004 Stock Incentive Plan, as amended

AGREEMENT made on August 22, 2006 between Momenta
Pharmaceuticals, Inc., a Delaware corporation
(the “Company”), and Craig Wheeler (the “Participant”).

For valuable consideration, receipt of which is
acknowledged, the parties hereto agree as follows:

1.             Issuance of Shares.

The Company hereby issues to the Participant, subject
to the terms and conditions set forth in this Agreement and in the Company’s
2004 Stock Incentive Plan, as amended (the “Plan”), 100,000 shares (the “Shares”)
of common stock, $0.0001 par value per share, of the Company (“Common Stock”).  The Shares will be held in book entry by the
Company’s transfer agent in the name of the Participant for that number of
Shares issued to the Participant.  The
Participant agrees that the Shares shall be subject to the forfeiture
provisions set forth in Section 2 of this Agreement and the restrictions
on transfer set forth in Section 3 of this Agreement.

2.             Vesting.

(a)           Subject
to the acceleration provisions set forth in that certain Employment Agreement,
dated August 22, 2006, between the Company and the Participant (the “Employment
Agreement”), in the event that the Participant ceases to be employed by the
Company prior to August 21, 2010, for any reason or no reason, with or without
cause, all of the Unvested Shares (as defined below) will be immediately and
automatically forfeited and returned to the Company for no consideration effective
as of the date of termination of employment. 
The Participant will have no further rights with respect to any Shares
that are so forfeited.  “Unvested
Shares” means the total number of Shares multiplied by the Applicable
Percentage.  The “Applicable
Percentage” shall be (i) 100% during the 48-month period ending on
August 21, 2010, and (ii) zero after August 21, 2010.

(b)           For purposes of this
Agreement, employment with the Company shall include employment with a parent
or subsidiary of the Company, or any successor to the Company, subject to the
terms and provisions of the Employment Agreement.

3.             Restrictions on Transfer.

(a)           The Participant shall not sell,
assign, transfer, pledge, hypothecate or otherwise dispose of, by operation of
law or otherwise (collectively “transfer”) any Shares, or any interest
therein, until such Shares have vested, except that the Participant may
transfer such Shares (i) to or for the benefit of any spouse, children,
parents, uncles, aunts, siblings, grandchildren and any other relatives
approved by the Board of Directors (collectively, “Approved Relatives”)
or to a trust established solely for the benefit of the Participant and/or

 

Approved Relatives, provided that such Shares shall remain
subject to this Agreement (including without limitation the restrictions on
transfer set forth in this Section 3 and the forfeiture provisions contained in
Section 2) and such permitted 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 Agreement
or (ii) as part of the sale of all or substantially all of the shares of
capital stock of the Company (including pursuant to a merger or consolidation),
provided that, in accordance with the Plan and except as otherwise
provided herein, the securities or other property received by the Participant
in connection with such transaction shall remain subject to this Agreement.

(b)           The Company shall
not be required (i) to transfer on its books any of the Shares which have been
transferred in violation of any of the provisions set forth in this Agreement
or (ii) to treat as owner of such Shares or to pay dividends to any transferee
to whom such Shares have been transferred in violation of any of the provisions
of this Agreement.

4.             Restrictive Legends.

All Shares subject to this Agreement subject to the
following restriction, in addition to any other legends that may be required
under federal or state securities laws:

“The shares of stock
represented by this certificate are subject to forfeiture provisions and
restrictions on transfer set forth in a certain Restricted Stock Agreement
between the corporation and the registered owner of these shares (or his
predecessor in interest), and such Agreement is available for inspection
without charge at the office of the Secretary of the corporation.”

5.             Provisions of the Plan.

This Agreement is subject to the provisions of the
Plan, a copy of which is furnished to the Participant with this Agreement.  Capitalized terms used, but not otherwise
defined, herein shall have the meaning given to them in the Plan.

6.             Withholding Taxes; Section 83(b) Election.

(a)           The Participant
acknowledges and agrees that the Company has the right to deduct from payments
of any kind otherwise due to the Participant any federal, state, local or other
taxes of any kind required by law to be withheld with respect to the issuance
of the Shares to the Participant or the lapse of the forfeiture provisions.  For so long as the Common Stock is registered
under the Exchange Act, the Participant may satisfy such tax obligations
in whole or in part by delivery of shares of Common Stock, including shares
retained from this award, valued at their Fair Market Value; provided, however,
that (i) the total tax withholding where stock is being used to satisfy such
tax obligations cannot exceed the Company’s minimum statutory withholding
obligations (based on minimum statutory withholding rates for federal and state
tax purposes, including payroll taxes, that are applicable to such supplemental
taxable income) and (ii) satisfaction of such tax obligations through shares of
the Company’s Common Stock, including Shares retained from this award, may only
be authorized by the Company’s

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Compensation
Committee in its sole discretion at any time prior to the occurrence of a
vesting date (whereby such Committee may adopt a resolution permitting the
Participant to satisfy his tax withholding obligation through the surrender of
shares of the Company’s Common Stock, including a portion of the Shares the
vesting of which gives rise to the withholding obligations).  Shares surrendered to satisfy tax withholding
requirements cannot be subject to any repurchase, forfeiture, unfulfilled
vesting or other similar requirements.

(b)           The Participant has
reviewed with the Participant’s own tax advisors the federal, state, local and
other tax consequences of this investment and the transactions contemplated by
this Agreement.  The Participant is
relying solely on such advisors and not on any statements or representations of
the Company or any of its agents.  The
Participant understands that the Participant (and not the Company) shall be
responsible for the Participant’s own tax liability that may arise as a result
of this investment and the transactions contemplated by this Agreement.

THE PARTICIPANT AGREES
NOT TO FILE AN ELECTION UNDER SECTION 83(B) OF THE INTERNAL REVENUE CODE WITH
RESPECT TO THE ISSUANCE OF THE SHARES.

7.             Miscellaneous.

(a)           No Rights to Employment.  Subject to the acceleration provisions set
forth in the Employment Agreement, the Participant acknowledges and agrees that
the vesting of the Shares pursuant to Section 2 hereof is earned only by
continuing service as an employee of the Company (not through the act of being
hired or being granted the Shares hereunder). 
The Participant further acknowledges and agrees that the transactions
contemplated hereunder and the vesting schedule set forth herein do not
constitute an express or implied promise of continued engagement as an employee
for the vesting period, for any period, or at all.

(b)           Severability.  The invalidity or unenforceability of any
provision of this Agreement shall not affect the validity or enforceability of
any other provision of this Agreement, and each other provision of this
Agreement shall be severable and enforceable to the extent permitted by law.

(c)           Waiver.  Any provision for the benefit of the Company
contained in this Agreement may be waived, either generally or in any
particular instance, by the Board of Directors of the Company.

(d)           Binding Effect.  This Agreement shall be binding upon and
inure to the benefit of the Company and the Participant and their respective
heirs, executors, administrators, legal representatives, successors and
assigns, subject to the restrictions on transfer set forth in Section 3 of this
Agreement.

(e)           Notice.   Each notice relating to this Agreement shall
be in writing and delivered in person or by first class mail, postage prepaid,
to the address as hereinafter provided. 
Each notice shall be deemed to have been given on the date it is
received.  Each notice to the Company
shall be addressed to it at its offices at 675 West Kendall Street, Cambridge,

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Massachusetts
02142 (Attention:  Vice President, Legal
Affairs).  Each notice to the Participant
shall be addressed to the Participant at the Participant’s last known address.

(f)            Pronouns.  Whenever the context may require, any
pronouns used in this Agreement shall include the corresponding masculine,
feminine or neuter forms, and the singular form of nouns and pronouns shall
include the plural, and vice versa.

(g)           Entire Agreement.  This Agreement, the Employment Agreement and
the Plan constitute the entire agreement between the parties, and supersede all
prior agreements and understandings, relating to the subject matter of this
Agreement.

(h)           Amendment.  This Agreement may be amended or modified
only by a written instrument executed by both the Company and the Participant.

(i)            Governing Law.  This Agreement shall be construed,
interpreted and enforced in accordance with the internal laws of the State of
Delaware without regard to any applicable conflicts of laws.

(j)            Interpretation.  The interpretation and construction of any
terms or conditions of the Plan, or of this Agreement or other matters related
to the Plan by the Compensation Committee of the Board of Directors of the
Company shall be final and conclusive.

(k)           Participant’s
Acknowledgments.  The Participant
acknowledges that he: (i) has read this Agreement; (ii) has been represented in
the preparation, negotiation, and execution of this Agreement by legal counsel
of the Participant’s own choice or has voluntarily declined to seek such
counsel; (iii) understands the terms and consequences of this Agreement; (iv)
is fully aware of the legal and binding effect of this Agreement; and (v)
understands that the law firm of Wilmer Cutler Pickering Hale and Dorr LLP is
acting as counsel to the Company in connection with the transactions contemplated
by the Agreement, and is not acting as counsel for the Participant.

(l)            Delivery of
Certificates.  The Participant may
request that the Company deliver the Shares in certificated form with respect
to any Shares that have ceased to be subject to forfeiture pursuant to Section
2.

(m)          No Deferral.  Notwithstanding anything herein to the
contrary, neither the Company nor the Participant may defer the delivery of the
Shares.

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IN WITNESS WHEREOF, the parties hereto have executed
this Agreement as of the day and year first above written.

	
  

  	
  MOMENTA PHARMACEUTICALS, INC.

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
    /s/ Richard P. Shea

  
	
   

  	
   

  	
  Richard P. Shea

  
	
   

  	
   

  	
  Vice President, Chief Financial Officer

  
	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  
	
   

  	
      /s/
  Craig A. Wheeler

  
	
   

  	
  Craig Wheeler

  

 

 5Exhibit 10.9

Momenta
Pharmaceuticals, Inc.

Nonstatutory Stock Option Agreement

Granted Under 2004 Stock Incentive Plan, as amended

1.             Grant of Option.

This agreement evidences
the grant by Momenta Pharmaceuticals, Inc., a Delaware corporation (the “Company”),
on August 22, 2006 (the “Grant
Date”) to Craig Wheeler, the Company’s President
as of such date and Chief Executive Officer as of September 12, 2006 (the “Participant”),
of an option to purchase, in whole or in part, on the terms provided herein and
in the Company’s 2004 Stock Incentive Plan, as amended (the “Plan”), a total of
355,223 shares (the “Shares”) of common stock, $0.0001 par
value per share, of the Company (“Common Stock”) at $16.18 per Share.  Unless earlier terminated, this option shall
expire at 5:00 p.m., Eastern time, on August 21, 2016 (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.

Subject to the
acceleration provisions set forth in that certain Employment Agreement, dated
August 22, 2006, between the Company and the Participant (the “Employment
Agreement”), this option will become exercisable (“vest”) as to (i) 25% of the
original number of Shares on August 22, 2007 and (ii) as to an additional 6.25%
of the original number of Shares at the end of each successive three-month period
following August 22, 2007 until the fourth anniversary of the Grant Date.

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 by written notice in the form attached hereto as Exhibit
A, 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.

(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 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 other entity the employees,
officers, directors, consultants, or advisors of which are eligible to receive
option grants under the Plan (an “Eligible Participant”).

(c)           Termination
of Relationship with the Company. 
Subject to the provisions set forth in the Employment Agreement, if the
Participant ceases to be an Eligible Participant as a result of:

(1)           voluntary
resignation of his employment from the Company other than for “Good Reason” (as
defined in the Employment Agreement), 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; or

(2)           termination
by Participant of his employment with the Company for “Good Reason” (as defined
in the Employment Agreement) or termination of Participant’s employment by the
Company without “cause” (as defined in the Employment Agreement), then, except
as provided in paragraphs (d) and (e) below, the right to exercise this
option shall terminate one year 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. 
Subject to the provisions set forth in the Employment Agreement, 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 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 (or in the case of death by
an authorized transferee), 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 in the Employment Agreement ), the right to exercise this option shall
terminate immediately upon the effective date of such discharge.

4.             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

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of, any federal,
state or local withholding taxes required by law to be withheld in respect of
this option.

5.             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.

6.             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.

	
  

  	
  MOMENTA PHARMACEUTICALS, INC.

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
  Dated: August
  22, 2006

  	
  By:

  	
    /s/ Richard P. Shea

  	
   

  	
   

  
	
   

  	
   

  	
  Richard P. Shea

  	
   

  	
   

  
	
   

  	
   

  	
  Vice President, Chief Financial Officer

  

 

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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
2004 Stock Incentive Plan, as amended.

	
  

  	
  PARTICIPANT:

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
   

  	
  /s/ Craig A. Wheeler

  
	
   

  	
   

  	
   

  
	
   

  	
  Address:

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
					

 

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EXHIBIT A

NOTICE OF STOCK OPTION EXERCISE

Date:                           

Participant name and address:

                                             

                                             

                                             

 

Attention:  Treasurer

Dear Sir or Madam:

I am the holder of an
Nonstatutory Stock Option granted to me under the Momenta Pharmaceuticals, Inc.
(the “Company”) 2004 Stock Incentive Plan, as amended, on                     
for the purchase of                    
shares of Common Stock of the Company at a purchase price of $                 
per share.

I hereby exercise my
option to purchase                 
shares of Common Stock (the “Shares”), for which I have enclosed                      
in the amount of $                 .  Please register my stock certificate as
follows:

	
  

  	
   

  	
   

  	
  (check applicable box)

  
	
   

  	
   

  	
   

  	
   

  
	
  Name(s):

  	
   

  	
   

  	
  o

  	
  TEN COM

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
  o

  	
  TEN ENT

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
  Address:

  	
   

  	
   

  	
  o

  	
  JT TEN

  
	
   

  	
   

  	
   

  	
   

  	
   

  
	
  Tax I.D. #:

  	
   

  	
   

  	
  o

  	
  UNIF GIFT MIN ACT

  

 

I represent, warrant and covenant as follows:

1.             I
am purchasing the Shares for my own account for investment only, and not with a
view to, or for sale in connection with, any distribution of the Shares in
violation of the Securities Act of 1933 (the “Securities Act”), or any rule or
regulation under the Securities Act.

 

 

2.             I have had such opportunity as I have deemed adequate to
obtain from representatives of the Company such information as is necessary to
permit me to evaluate the merits and risks of my investment in the Company.

3.             I have sufficient experience in business, financial and
investment matters to be able to evaluate the risks involved in the purchase of
the Shares and to make an informed investment decision with respect to such
purchase.

4.             I can afford a complete loss of the value of the Shares
and am able to bear the economic risk of holding such Shares for an indefinite
period.

	
  Very truly yours,

  
	
   

  
	
   

  
	
   

  	
   

  
	
  (Signature)

  

 

 6

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