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  Exhibit 10.1    
    

A123
SYSTEMS, INC. 

2001 STOCK INCENTIVE PLAN, AS AMENDED

1.    Purpose.  

        The purpose of this 2001 Stock Incentive Plan (the "Plan") of A123 Systems, 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 of the Company's present or future parent or subsidiary corporations as defined in Sections 424(e) or
(f) of the Internal Revenue Code of 1986, as amended, and any regulations promulgated thereunder (the "Code") and any other business venture (including, without limitation, joint venture or
limited liability company) in which the Company has a significant interest, as determined by the Board of Directors of the Company (the "Board"). 

2.    Eligibility.  

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

3.    Administration and Delegation.  

        (a)    Administration by Board of Directors.    The Plan will be
administered by 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. 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. 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 relating to or under
the Plan made in good faith. 

        (b)   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"). All references in the Plan to the "Board" shall mean the Board or a Committee of the Board to the
extent that the Board's powers or authority under the Plan have been delegated to such Committee. 

4.    Stock Available for Awards.    Subject to adjustment under Section 8, Awards may be made under the Plan for up to
13,700,000 shares of common stock, $.001 par value per share, of the Company (the "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 (including as the result of shares of Common Stock subject to such Award being repurchased by the Company at the original issuance price pursuant to a contractual
repurchase right) 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 limitations under the Code. Shares issued under the Plan may consist in whole or in part of authorized but unissued shares or
treasury shares. At no time while there is any Option (as defined below) outstanding and held by a Participant who was a resident of the State of California on the date of grant of such Option, shall
the total number of shares of Common Stock issuable upon exercise of all outstanding options and the total number of shares provided for under any stock bonus or similar plan of the Company exceed the
applicable percentage as calculated in accordance with the conditions and exclusions of 

 

Section 260.140.45
of the California Code of Regulations, based on the shares of the Company which are outstanding at the time the calculation is made. 

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 (as hereinafter defined) 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 shall be 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 by delivery to the Company of a written notice of exercise
signed by the proper person or by any other form of notice (including electronic notice) approved by the Board 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; 

        (2)   except
as the Board may, in its sole discretion, otherwise provide in an option agreement, by (i) delivery of an irrevocable and unconditional undertaking by a
creditworthy broker to deliver promptly to the Company sufficient funds to pay the exercise price and any required tax withholding or (ii) 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 and any required tax withholding; 

        (3)   when
the Common Stock is registered under the Securities Exchange Act of 1934 (the "Exchange Act"), by delivery of shares of Common Stock owned by the Participant valued
at their fair market value as determined by (or in a manner approved by) the Board in good faith ("Fair Market Value"), provided (i) such method of payment is then permitted under applicable
law and (ii) such Common Stock, if acquired directly from the Company, was owned by the Participant at least six months prior to such delivery; 

        (4)   to
the extent permitted by the Board, in its sole discretion by (i) delivery of a promissory note of the Participant to the Company on terms determined by the
Board, or (ii) payment of such other lawful consideration as the Board may determine; or 

        (5)   by
any combination of the above permitted forms of payment. 

        (g)   Substitute Options.    In connection with a merger or consolidation of an entity with the Company or the
acquisition by the Company of property or stock of an entity, the Board may grant Options in substitution for any options or other stock or stock-based awards granted by such entity or an affiliate
thereof. Substitute Options may be granted on such terms as the Board deems appropriate 

2

 

in
the circumstances, notwithstanding any limitations on Options contained in the other sections of this Section 5 or in Section 2. 

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. 

        (c)   Stock Certificates.    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. 

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.    Adjustments for Changes in Common Stock and Certain Other Events.  

        (a)   Changes in Capitalization.    In the event of any stock split, reverse stock split, stock dividend,
recapitalization, combination of shares, reclassification of shares, 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 securities and exercise price per share subject to each outstanding
Option, (iii) the repurchase price per share subject to each outstanding Restricted Stock Award, and (iv) the terms of each other outstanding 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 8(a) applies and Section 8(c) also applies to any event, Section 8(c) shall be applicable to such event, and this Section 8(a) shall not be applicable. 

        (b)   Liquidation or Dissolution.    In the event of a proposed liquidation or dissolution of the Company, the Board
shall upon written notice to the Participants provide that all then unexercised Options will (i) become exercisable in full as of a specified time at least 10 business days prior to the
effective date of such liquidation or dissolution and (ii) terminate effective upon such liquidation or dissolution, except to the extent exercised before such effective date. The Board may
specify the effect of a liquidation or dissolution on any Restricted Stock Award or other Award granted under the Plan at the time of the grant of such Award. 

3

 

        (c)   Reorganization Events.

        (1)   Definition.    A "Reorganization Event" shall mean: (a) any merger or consolidation of the Company with
or into another entity as a result of which all of the Common Stock of the Company is converted into or exchanged for the right to receive cash, securities or other property or (b) any exchange
of all of the Common Stock of the Company for cash, securities or other property pursuant to a share exchange transaction. 

        (2)   Consequences of a Reorganization Event on Options.    Upon the occurrence of a Reorganization Event, or the
execution by the Company of any agreement with respect to a Reorganization Event, the Board shall provide that all outstanding Options shall be assumed, or equivalent options shall be substituted, by
the acquiring or succeeding corporation (or an affiliate thereof). For purposes hereof, an Option shall be considered to be assumed if, following consummation of the Reorganization Event, the Option
confers the right to purchase, for each share of Common Stock subject to the Option immediately prior to the consummation of the Reorganization Event, the consideration (whether cash, securities or
other property) received as a result of the Reorganization Event by holders of Common Stock for each share of Common Stock held immediately prior to the consummation of the Reorganization Event (and
if holders were offered a choice of consideration, the type of consideration chosen by the holders of a majority of the outstanding shares of Common Stock); provided, however, that if the
consideration received as a result of the Reorganization Event is not solely common stock of the acquiring or succeeding corporation (or an affiliate thereof), the Company may, with the consent of the
acquiring or succeeding corporation, provide for the consideration to be received upon the exercise of Options to consist solely of common stock of the acquiring or succeeding corporation (or an
affiliate thereof) equivalent in fair market value to the per share consideration received by holders of outstanding shares of Common Stock as a result of the Reorganization Event. 

        Notwithstanding
the foregoing, if the acquiring or succeeding corporation (or an affiliate thereof) does not agree to assume, or substitute for, such Options, then the Board shall, upon
written notice to the Participants, provide that all then unexercised Options will become exercisable in full as of a specified time prior to the Reorganization Event and will terminate immediately
prior to the consummation of such Reorganization Event, except to the extent exercised by the Participants before the consummation of such Reorganization Event; provided, however, that in the event of
a Reorganization Event under the terms of which holders of Common Stock will receive upon consummation thereof a cash payment for each share of Common Stock surrendered pursuant to such Reorganization
Event (the "Acquisition Price"), then the Board may instead provide that all outstanding Options shall terminate upon consummation of such Reorganization Event and that each Participant shall receive,
in exchange therefor, a cash payment equal to the amount (if any) by which (A) the Acquisition Price multiplied by the number of shares of Common Stock subject to such outstanding Options
(whether or not then exercisable), exceeds (B) the aggregate exercise price of such Options. To the extent all or any portion of an Option becomes exercisable solely as a result of the first
sentence of this paragraph, upon exercise of such Option the Participant shall receive shares subject to a right of repurchase by the Company or its successor at the Option exercise price. Such
repurchase right (1) shall lapse at the same rate as the Option would have become exercisable under its terms and (2) shall not apply to any shares subject to the Option that were
exercisable under its terms without regard to the first sentence of this paragraph. 

        If
any Option provides that it may be exercised for shares of Common Stock which remain subject to a repurchase right in favor of the Company, upon the occurrence of a Reorganization
Event, any shares of restricted stock received upon exercise of such Option shall be treated in accordance with Section 8(c)(3) as if they were a Restricted Stock Award. 

4

 

        (3)   Consequences of a Reorganization Event on Restricted Stock Awards.    Upon the occurrence of a Reorganization
Event, the repurchase and other rights of the Company under each outstanding Restricted Stock Award shall inure to the benefit of the Company's successor and shall apply to the cash, securities or
other property which the Common Stock was converted into or exchanged for pursuant to such Reorganization Event in the same manner and to the same extent as they applied to the Common Stock subject to
such Restricted Stock Award. 

        (4)   Consequences of a Reorganization Event on Other Awards.    The Board shall specify the effect of a
Reorganization Event on any other Award granted under the Plan at the time of the grant of such Award. 

9.    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 shall be evidenced in such form (written, electronic or otherwise) 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 Award may be made alone or in addition or
in relation to any other Award. The terms of each 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)   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. Except as the Board may otherwise
provide in an Award, when the Common Stock is registered under the Exchange Act, Participants may satisfy such tax obligations in whole or in part by delivery of shares of Common Stock, including
shares retained from the Award creating the tax obligation, valued at their Fair Market Value; provided, however, that 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). 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. 

        (f)    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. 

        (g)   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 

5

 

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. 

        (h)   Acceleration.    The Board may at any time provide that any Award shall become immediately exercisable in full
or in part, free of some or all restrictions or conditions, or otherwise realizable in full or in part, as the case may be. 

10.    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 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.
Notwithstanding the foregoing, in the event the Company effects a split of the Common Stock by means of a stock dividend and the exercise price of and the number of shares subject to such Option are
adjusted as of the date of the distribution of the dividend (rather than as of the record date for such dividend), then an optionee who exercises an Option between the record date and the distribution
date for such stock dividend shall be entitled to receive, on the distribution date, the stock dividend with respect to the shares of Common Stock acquired upon such Option exercise, notwithstanding
the fact that such shares were not outstanding as of the close of business on the record date for such stock dividend. 

        (c)   Effective Date and Term of Plan.    The Plan shall become effective on the date on which it is adopted by the
Board. 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. 

        (e)   Authorization of Sub-Plans.    The Board may from time to time establish one or more
sub-plans under the Plan for purposes of satisfying applicable blue sky, securities or tax laws of various jurisdictions. The Board shall establish such sub-plans by adopting
supplements to this Plan containing (i) such limitations on the Board's discretion under the Plan as the Board deems necessary or desirable or (ii) such additional terms and conditions
not otherwise inconsistent with the Plan as the Board shall deem necessary or desirable. All supplements adopted by the Board shall be deemed to be part of the Plan, but each supplement shall apply
only to Participants within the affected jurisdiction and the Company shall not be required to provide copies of any supplement to Participants in any jurisdiction which is not the subject of such
supplement. 

        (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. 

6

 A123 SYSTEMS, INC.  

2001 STOCK INCENTIVE PLAN  

CALIFORNIA SUPPLEMENT  

        Pursuant to Section 10(e) of the Plan, the Board has adopted this supplement for purposes of satisfying the requirements of Section 25102(o) of the
California Corporations Code: 

        Any
Awards granted under the Plan to a Participant who is a resident of the State of California on the date of grant (a "California Participant") shall be subject to the following
additional limitations, terms and conditions: 

1.    Additional Limitations on Options.  

        (a)    Minimum Vesting Rate.    Except in the case of Options
granted to California Participants who are officers, directors, consultants or advisors of the Company or its affiliates (which Options may become exercisable at whatever rate is determined by the
Board), Options granted to California Participants shall become exercisable at a rate of no less than 20% per year over five years from the date of grant; provided,
that, such Options may be subject to such reasonable forfeiture conditions as the Board may choose to impose and which are not inconsistent with Section 260.140.41 of
the California Code of Regulations. 

        (b)   Minimum Exercise Price.    The exercise price of Options granted to California Participants may not be less
than 85% of the Fair Market Value of the Common Stock on the date of grant in the case of a Nonstatutory Stock Option or less than 100% of the Fair Market Value of the Common Stock on the date of
grant in the case of an Incentive Stock Option; provided, however, that if the California Participant is
a person who owns stock possessing more than 10% of the total combined voting power of all classes of stock of the Company or its parent or subsidiary corporations, the exercise price shall be not
less than 110% of the Fair Market Value of the Common Stock on the date of grant. 

        (c)   Maximum Duration of Options.    No Options granted to California Participants will be granted for a term in
excess of 10 years. 

        (d)   Minimum Exercise Period Following Termination.    Unless a California Participant's employment is terminated
for cause (as defined in any contract of employment between the Company and such Participant, or if none, in the instrument evidencing the grant of such Participant's Option), in the event of
termination of employment of such Participant, he or she shall have the right to exercise an Option, to the extent that he or she was otherwise entitled to exercise such Option on the date employment
terminated, as follows: (i) at least six months from the date of termination, if termination was caused by such Participant's death or "permanent and total disability" (within the meaning of
Section 22(e)(3) of the Code) and (ii) at least 30 days from the date of termination, if termination was caused other than by such Participant's death or "permanent and total
disability" (within the meaning of Section 22(e)(3) of the Code). 

        (e)   Limitation on Repurchase Rights.    If an Option granted to a California Participant gives the Company the
right to repurchase shares of Common Stock issued pursuant to the Plan upon termination of employment of such Participant, the terms of such repurchase right must comply with
Section 260.140.41(k) of the California Code of Regulations. 

2.    Additional Limitations for Restricted Stock Awards.

        (a)    Minimum Purchase Price.    The purchase price for a Restricted Stock Award granted
to a California Participant shall be not less than 85% of the Fair Market Value of the Common Stock at the time such Participant is granted the right to purchase shares under the Plan or at the time
the purchase is consummated; provided, however, that if such Participant is a person who owns stock possessing more than 10% of the total combined
voting power or value of all classes of stock of the Company or its parent or subsidiary corporations, the purchase price shall be not less than 100% of the Fair Market 

 

Value
of the Common Stock at the time such Participant is granted the right to purchase shares under the Plan or at the time the purchase is consummated. 

        (b)   Limitation of Repurchase Rights.    If a Restricted Stock Award granted to a California Participant gives the
Company the right to repurchase shares of Common Stock issued pursuant to the Plan upon termination of employment of such Participant, the terms of such repurchase right must comply with
Section 260.140.42(h) of the California Code of Regulations. 

        3.     Additional Limitations for Other Stock-Based Awards.    The terms of all Awards granted to a California
Participant under Section 7 of the Plan shall comply, to the extent applicable, with Section 260.140.41 or Section 260.140.42 of the California Code of Regulations. 

        4.     Additional Limitations on Transferability of Awards.    Except as provided in the next sentence, Awards granted
to California Participants 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 such Participant, shall be exercisable only by such Participant. Notwithstanding the foregoing, the Board may, in the case of
Nonstatutory Stock Options, allow them to be transferred to an inter vivos or testamentary trust in which the Options are to be passed to beneficiaries upon the death of the trustor (settlor) or by
gift to "immediate family" as that term is defined in Rule 16a-1(e) under the Exchange Act. 

        5.     Additional Requirement to Provide Information to California Participants.    The Company shall provide to each
California Participant and to each California Participant who acquires Common Stock pursuant to the Plan, not less frequently than annually, copies of annual financial statements (which need not be
audited). The Company shall not be required to provide such statements to key employees whose duties in connection with the Company assure their access to equivalent information. 

        6.     Additional Limitations on Timing of Awards.    No Award granted to a California Participant shall become
exercisable, vested or realizable, as applicable to such Award, unless the Plan has been approved by the Company's stockholders within 12 months before or after the date the Plan was adopted by
the Board. 

        7.     Additional Limitations Relating to Definition of Fair Market Value.    For purposes of Section 1(b) and
2(a) of this supplement, "Fair Market Value" shall be determined in a manner not inconsistent with Section 260.140.50 of the California Code of Regulations. 

A-2

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  Exhibit 10.15    
    

 
    A123 SYSTEMS, INC.
  
    SEVENTH AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT    
    

        This Agreement dated as of April 3, 2009 is entered into by and among A123 Systems, Inc., a Delaware corporation (the
"Company"), Ricardo Fulop, Gilbert Riley, Jr. and Yet-Ming Chiang (individually, a "Founder" and collectively, the "Founders"), the Massachusetts Institute of Technology ("M.I.T."),
Comerica Bank ("Comerica"), Heller Financial Leasing, Inc. ("Heller"), Silicon Valley Bank ("SVB"), Gold Hill Venture Lending 03, L.P. ("Gold Hill"), the individuals and entities listed
as Series A Purchasers on Exhibit A hereto (the "Series A Purchasers"), the individuals and entities listed as
Series A-1 Purchasers on Exhibit A hereto (the "Series A-1 Purchasers"), the individuals and entities
listed as Series B Purchasers on Exhibit A hereto (the "Series B Purchasers"), the individuals and entities listed as
Series C Purchasers on Exhibit A hereto (the "Series C Purchasers"), the individuals and entities listed as Series D
Purchasers on Exhibit A hereto (the "Series D Purchasers"), the individuals and entities listed as Series E Purchasers on  Exhibit A
hereto (the "Series E Purchasers") the individuals and entities listed as Series F Purchasers on  Exhibit A hereto (the "Series F Purchasers") and the individuals and entities listed
as Common Stock Purchasers on  Exhibit A hereto (the "Common Investors"). The Series A Purchasers, Series A-1 Purchasers, Series B Purchasers,
Series C Purchasers, Series D Purchasers, Series E Purchasers, Series F Purchasers, SVB and Gold Hill are collectively referred to herein as the "Investors". The term
"Investors" shall include (i) M.I.T. only with respect to its rights and obligations relating to the shares of Series A Preferred, Series B Preferred, Series C Preferred
and Series D Preferred (each as defined below) held by M.I.T and (ii) Gold Hill only with respect to its rights and obligations relating to the shares of Series C Preferred and
Series D Preferred held by Gold Hill. The term "M.I.T." shall not include any transferees of M.I.T. 

 
 

  Recitals    
    

        WHEREAS, on December 4, 2001, the Company and M.I.T. entered into an Exclusive Patent License Agreement (the "License
Agreement"); 

        WHEREAS,
the Series A Purchasers acquired an aggregate of 8,300,000 shares of Series A Convertible Preferred Stock, $0.001 par value per share, of the Company
("Series A Preferred") pursuant to the terms of a Series A Convertible Preferred Stock Purchase Agreement dated as of December 17, 2001, by and among the Company and the
Series A Purchasers (the "Series A Purchase Agreement"); 

        WHEREAS,
on July 19, 2002, the Company issued to Comerica a warrant to purchase up to an aggregate of 22,500 shares of Series A Preferred; 

        WHEREAS,
the Series A-1 Purchasers acquired an aggregate of 2,925,000 shares of Series A-1 Convertible Preferred Stock, $0.001 par value per share,
of the Company (the "Series A-1 Preferred") pursuant to the terms of a Series A-1 Convertible Preferred Stock Purchase Agreement dated as of November 25,
2002 by and among the Company and the Series A-1 Purchasers (the "Series A-1 Purchase Agreement"); 

        WHEREAS,
the Series B Investors acquired an aggregate of 9,623,750 shares of Series B Convertible Preferred Stock, $0.001 par value per share, of the Company (the
"Series B Preferred") pursuant to the terms of a Series B Convertible Preferred Stock Purchase Agreement dated as of June 1, 2004 by and among the Company and the Series B
Purchasers (the "Series B Purchase Agreement"); 

        WHEREAS,
on February 24, 2005, the Company issued to Heller a warrant to purchase up to an aggregate of 67,366 shares of Series B Preferred; 

        WHEREAS,
the Series C Purchasers acquired an aggregate of 8,899,395 shares of Series C Convertible Preferred Stock, $0.001 par value per share, of the Company (the
"Series C Preferred") pursuant to the terms of a Series C Convertible Preferred Stock Purchase Agreement dated as of 

 

January 30,
2006 by and among the Company and the Series C Purchasers (the "Series C Purchase Agreement"); 

        WHEREAS,
on August 2, 2006, the Company issued to SVB and Gold Hill warrants to purchase an aggregate of 59,330 shares of Series C Preferred (the "Series C
Warrants"); 

        WHEREAS,
Gold Hill acquired 88,994 shares of Series C Preferred pursuant to the terms of a Subscription Agreement dated as of August 4, 2006 by and among the Company and
Gold Hill (the "Subscription Agreement"); 

        WHEREAS,
the Series D Purchasers acquired an aggregate of 10,669,708 shares of the Series D Convertible Preferred Stock, $0.001 par value per share, of the Company (the
"Series D Preferred") pursuant to the terms of a Series D Convertible Preferred Stock Purchase Agreement dated as of January 24, 2007 by and among the Company and the
Series D Purchasers, as amended by Amendment No. 1 to the Purchase Agreement dated as of August 3, 2007 (as amended, the "Series D Purchase Agreement"); 

        WHEREAS,
the Common Investors acquired an aggregate of 1,592,797 shares of the Common Stock, $0.001 par value per share, of the Company (the "Common Stock") pursuant to the terms of
Common Stock Subscription Agreements dated as of January 11, 2008 and February 8, 2008 by and between the Company and each of the Common Investors (collectively, the "Common Stock
Subscription Agreements"); 

        WHEREAS,
the Series E Purchasers acquired an aggregate of 6,152,553 shares of the Series E Convertible Preferred Stock, $0.001 par value per share, of the Company (the
"Series E Preferred") pursuant to the terms of a Series E Convertible Preferred Stock Purchase Agreement dated as of May 6, 2008 by and among the Company and the Series E
Purchasers, as amended by Amendment No. 1 to the Purchase Agreement dated as of June 16, 2008 (as amended, the "Series E Purchase Agreement"); 

        WHEREAS,
the Series F Purchasers are purchasing up to 7,531,763 shares of the Series F Convertible Preferred Stock, $0.001 par value per share, of the Company (the
"Series F Preferred") pursuant to the Series F Convertible Preferred Stock Purchase Agreement of even date herewith (as such agreement may be amended from time to time, the
"Series F Purchase Agreement"); 

        WHEREAS,
the Company, the Series A Purchasers, the Series A-1 Purchasers, the Series B Purchasers, the Series C Purchasers, the Series D
Purchasers, the Series E Purchasers, the
Common Investors, M.I.T., Comerica, Heller, SVB, Gold Hill and the Founders are parties to a certain Sixth Amended and Restated Investor Rights Agreement dated as of May 6, 2008, as amended by
Amendment No. 1 dated as of June 16, 2008 (collectively, the "Old Investor Rights Agreement"), pursuant to which the Company granted the Series A Purchasers, the
Series A-1 Purchasers, the Series B Purchasers, the Series C Purchasers, Series D Purchasers, Series E Purchasers, Common Investors, M.I.T., Comerica,
Heller, SVB, Gold Hill and certain holders of Common Stock certain rights with respect to their shares of capital stock of the Company; 

        WHEREAS,
the parties to the Old Investor Rights Agreement hereby desire that the Old Investor Rights Agreement be amended and restated in its entirety to provide for the terms and
conditions included herein and to include the Series F Purchasers as parties hereto; 

        WHEREAS,
the undersigned represent holders of at least 662/3% of the Registrable Shares owned by all of the Investors (as defined in the Old Investor Rights Agreement); 

        WHEREAS,
the Company, the Founders, the Series A Purchasers, the Series A-1 Purchasers, the Series B Purchasers, the Series C Purchasers, the
Series D Purchasers, the Series E Purchasers, the Series F Purchasers, the Common Investors, M.I.T., Comerica, Heller, SVB and Gold Hill desire to provide for certain arrangements
with respect to (i) the registration of shares of capital stock of the 

2

 

Company
under the Securities Act of 1933 and (ii) the Investors' right of first refusal with respect to certain issuances of securities of the Company; and 

        WHEREAS,
it is a condition to the obligations of the Series F Purchasers under the Series F Purchase Agreement that this Agreement be executed by the parties hereto, and
the parties are willing to execute this Agreement and be bound by the provisions hereof. 

        NOW,
THEREFORE, in consideration of the mutual promises and covenants contained in this Agreement and for other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows: 

        1.    Certain Definitions.    

        As
used in this Agreement, the following terms shall have the following respective meanings: 

        "Comerica
Warrant" shall mean the warrant to purchase Series A Convertible Preferred Stock issued to Comerica Bank on July 19, 2002. 

        "Commission"
means the Securities and Exchange Commission, or any other federal agency at the time administering the Securities Act. 

        "Common
Investors" means GPSF Securities Inc. and Novus A123 Investments LLC. 

        "Common
Shares" means the shares of Common Stock held by the Common Investors. 

        "Common
Stock" shall have the meaning ascribed to it in the recitals hereto. 

        "Company"
shall have the meaning set forth in the Preamble. 

        "Exchange
Act" means the Securities Exchange Act of 1934, as amended, or any successor federal statute, and the rules and regulations of the Commission issued under such Act, as they
each may, from time to time, be in effect. 

        "Founder"
shall have the meaning ascribed to it in the introductory paragraph hereto. 

        "Founders"
shall have the meaning ascribed to it in the introductory paragraph hereto. 

        "Gold
Hill" shall have the meaning ascribed to it in the introductory paragraph hereto. 

        "Heller"
shall have the meaning ascribed to it in the introductory paragraph hereto. 

        "Initiating
Holders" means the Stockholders initiating a request for registration pursuant to Section 2.1(a) or 2.1(b), as the case may be. 

        "Initial
Public Offering" means the initial underwritten public offering of shares of Common Stock pursuant to an effective Registration Statement. 

        "Investors"
shall have the meaning ascribed to it in the introductory paragraph hereto, and shall be deemed to include the Common Investors for purposes of Sections 2 (but not
with regard to required registrations under Section 2.1), 5 and 8(f). 

        "M.I.T.
Shares" shall mean the shares of Common Stock issued to M.I.T. pursuant to the License Agreement. 

        "Other
Holders" shall have the meaning set forth in Section 2.1(d). 

        "Prospectus"
means the prospectus included in any Registration Statement, as amended or supplemented by an amendment or prospectus supplement, including post-effective
amendments, and all material incorporated by reference or deemed to be incorporated by reference in such Prospectus. 

        "Registration
Statement" means a registration statement filed by the Company with the Commission for a public offering and sale of securities of the Company (other than a registration 

3

 

statement
on Form S-8 or Form S-4, or their successors, or any other form for a similar limited purpose, or any registration statement covering only securities
proposed to be issued in exchange for securities or assets of another corporation). 

        "Registration
Expenses" means the expenses described in Section 2.4. 

        "Registrable
Shares" means (i) the shares of Common Stock issued or issuable to an Investor upon conversion of the Shares, (ii) any shares of Common Stock held by an
Investor or an affiliate of such Investor, and any shares of Common Stock issued or issuable upon the conversion or exercise of any other securities acquired by such Investor or an affiliate of such
Investor pursuant to Section 3 of this Agreement, (iii) any other shares of Common stock issued in respect of the shares described in clauses (i) and (ii) (because of stock
dividends, splits, reclassifications, recapitalizations, or similar events), (iv) for purposes of Section 2.2 only, any shares of Common Stock held by the Founders as of the date of this
Agreement, or the M.I.T. Shares held by M.I.T., subject to limitations on registration rights, (v) for purposes of Sections 2.2, 2.5, 2.7, 2.8 and 2.11 only, the shares of Common Stock
issued or issuable upon conversion of the shares of Series A Preferred Stock issued or issuable upon exercise of
the Comerica Warrant, (vi) for purposes of Sections 2.2, 2.5, 2.7, 2.8 and 2.11 only, the shares of Common Stock issued or issuable upon conversion of the shares of Series B
Preferred Stock issued or issuable upon exercise of the Series B Warrant, (vii) except for purposes of Sections 2.1(a) and 2.9, the shares of Common Stock issued or issuable upon
conversion of the shares of Series C Preferred Stock issued or issuable upon exercise of the Series C Warrants and (viii) for purposes of Sections 2 (but not with regard to
required registrations under Section 2.1), 8(b) and 8(f) only, the Common Shares; provided,  however, that shares of Common Stock which are Registrable
Shares shall cease to be Registrable Shares upon (i) any sale pursuant to a
Registration Statement or Rule 144 under the Securities Act or (ii) any sale in any manner to a person or entity which, by virtue of Section 6 of this Agreement, is not entitled
to the rights provided by this Agreement. Wherever reference is made in this Agreement to a request or consent of holders of a certain percentage of Registrable Shares, the determination of such
percentage shall include shares of Common Stock issuable upon conversion of the Shares even if such conversion has not been effected. 

        "Securities
Act" means the Securities Act of 1933, as amended, or any successor federal statute, and the rules and regulations of the Commission issued under such Act, as they each may,
from time to time, be in effect. 

        "Selling
Stockholder" means any Stockholder owning Registrable Shares included in a Registration Statement. 

        "Series B-1
Preferred" means the shares of the Company's Series B-1 Convertible Stock, $.001 par value per share. 

        "Series B
Warrant" shall mean the warrant to purchase Series B Convertible Preferred Stock issued to Heller on February 24, 2005. 

        "Series C
Warrants" shall have the meaning ascribed to it in the recitals hereto. 

        "Shares"
means (i) the shares of Series A Preferred sold under the Series A Purchase Agreement, (ii) the shares of Series A-1 Preferred
sold under the Series A-1 Purchase Agreement, (iii) the shares of Series B Preferred sold under the Series B Purchase Agreement, (iv) the shares of
Series C Preferred sold under the Series C Purchase Agreement, (v) the shares of Series C Preferred sold under the Subscription Agreement, (vi) the shares of
Series D Preferred sold under the Series D Purchase Agreement, (vii) the shares of Series E Preferred sold under the Series E Purchase Agreement, (viii) the
shares of Series F Preferred sold under the Series F Purchase Agreement and (ix) for purposes of Sections 4.1, 4.2 and 6 only, the Common Shares held by the Common
Investors. 

4

 

  
        "Stockholder" means (i) any Investor or affiliate of an Investor and any persons or entities to whom the rights granted under this Agreement are transferred by any Investors or
such affiliates, their successors or assigns, (ii) any Founder (but not with regard to required registrations), (iii) M.I.T. (but not with regard to required registrations),
(iv) for purposes of Sections 1, 2 (but not with regard to required registrations), 5, 6, 7 and 8 only, Comerica and Heller, (v) with respect to the rights and obligations of SVB
and Gold Hill relating to the Series C Warrants and any shares issued or issuable thereunder, for purposes of Sections 1, 2 (but not with regard to Sections 2.1(a) and 2.9), 5, 6,
7 and 8 only, SVB and Gold Hill and (vi) for purposes of Sections 1, 2 (but not with regard to required registrations under Section 2.1), 5, 6, 7 and 8 only, a Common Investor. 

        "Stockholders"
means (i) the Investors or any affiliates of Investors and any persons or entities to whom the rights granted under this Agreement are transferred by such Investors
or affiliates, their successors or assigns, (ii) the Founders (but not with regard to required registrations), (iii) M.I.T. (but not with regard to required registrations),
(iv) for purposes of Sections 1, 2 (but not with regard to required registrations) 5, 6, 7 and 8 only, Comerica and Heller, (v) with respect to the rights and obligations of SVB
and Gold Hill relating to the Series C Warrants and any shares issued or issuable thereunder, for purposes of Sections 1, 2 (but not with regard to Sections 2.1(a) and 2.9), 5, 6,
7 and 8 only, SVB and Gold Hill and (vi) for purposes of Sections 1, 2 (but not with regard to required registrations under Section 2.1), 5, 6, 7 and 8 only, the Common Investors. 

        "Subscription
Agreement" shall have the meaning ascribed to it in the recitals hereto. 

        "SVB"
shall have the meaning ascribed to it in the introductory paragraph hereto. 

        2.    Registration Rights    

        2.1.    Required Registrations.    

        (a)   At
any time after (i) April 3, 2012, or (ii) six months following the Company's Initial Public Offering, whichever is earlier, a Stockholder or
Stockholders holding in the aggregate at least 35% of the Registrable Shares may request, in writing, that the Company effect the registration on Form S-1 or
Form S-2 (or any successor form) of Registrable Shares owned by such Stockholder or Stockholders. 

        (b)   At
any time after the Company becomes eligible to file a Registration Statement on Form S-3 (or any successor form relating to secondary
offerings), a Stockholder or Stockholders holding in the aggregate at least 10% of the Registrable Shares may request, in writing, that the Company effect the registration on
Form S-3 (or such successor form), of Registrable Shares having an aggregate value of at least $1,000,000 (based on the then current public market price). 

        (c)   Upon
receipt of any request for registration pursuant to this Section 2, the Company shall promptly give written notice of such proposed registration to all other
Stockholders. Such Stockholders shall have the right, by giving written notice to the Company within 30 days after the Company provides its notice, to elect to have included in such
registration such of their Registrable Shares as such Stockholders may request in such notice of election, subject in the case of an underwritten offering to the approval of the managing underwriter
as provided in Section 2(d) below. Thereupon, the Company shall, as expeditiously as possible, use its reasonable best efforts to effect the registration on an appropriate registration form of
all Registrable Shares which the Company has been requested to so register (provided, however, that in the case of a registration requested under Section 2.1(b), the Company will only be
obligated to effect such registration on Form S-3 (or any successor form)). 

        (d)   If
the Initiating Holders intend to distribute the Registrable Shares covered by their request by means of an underwriting, they shall so advise the Company as a part of
their request made pursuant to Section 2.1(a) or (b), as the case may be, and the Company shall include such 

5

 

information
in its written notice referred to in Section 2.1(c). The right of any other Stockholder to include its Registrable Shares in such registration pursuant to Section 2.1(a) or
(b), as the case may be, shall be conditioned upon such other Stockholder's participation in such underwriting on the terms set forth herein. 

          If
the Company desires that any securities of the Company held by officers and directors of the Company be included in any registration for an underwritten
offering requested pursuant to Sections 2.1(a) or (b) or if other holders of securities of the Company who are entitled, by contract with the Company, to have securities included in such
a registration (the "Other Holders") request such inclusion, the Company may include the securities of such officers, directors and Other Holders in such
registration and underwriting on the terms set forth herein. The Company shall (together with all Stockholders, officers, directors and Other Holders proposing to distribute their securities through
such underwriting) enter into an underwriting agreement in customary form (including, without limitation, customary indemnification and contribution provisions on the part of the Company) with the
managing underwriter. Notwithstanding any other provision of this Section 2.1(d), if the managing underwriter advises the Company that the inclusion of all shares requested to be registered
would adversely affect the offering, the securities of the Company held by officers or directors of the Company (other than Registrable Shares) and the securities held by Other Holders (other than
Registrable Shares) shall be excluded from such registration and underwriting to the extent deemed advisable by the managing underwriter, and if a further limitation of the number of shares is
required, the number of shares that may be included in such registration and underwriting shall be allocated among all holders of Registrable Shares requesting registration in proportion, as nearly as
practicable, to the respective number of Registrable Shares held by them at the time of the request for registration made by the Initiating Holders pursuant to Section 2.1(a) or (b), as the
case may be. If any holder of Registrable Shares, officer, director or Other Holder who has requested inclusion in such registration as provided above disapproves of the terms of the underwriting,
such person may elect to withdraw therefrom by written notice to the Company, and the securities so withdrawn shall also be withdrawn from registration. If the managing underwriter has not limited the
number of Registrable Shares or other securities to be underwritten, the Company may include securities for its own account in such registration if the managing underwriter so agrees and if the number
of Registrable Shares and other securities which would otherwise have been included in such registration and underwriting will not thereby be limited. 

        (e)   The
Initiating Holders shall have the right to select the managing underwriter(s) for any underwritten offering requested pursuant to Section 2.1(a) or (b),
subject to the approval of the Company, which approval will not be unreasonably withheld. 

        (f)    The
Company shall not be required to effect more than two (2) registrations pursuant to Section 2.1(a). In addition, the Company shall not be required to
effect any registration (other than on Form S-3 or any successor form relating to secondary offerings) within six months after the effective date of any other Registration Statement
of the Company. For purposes of this Section 2.1(f), a Registration Statement shall not be counted until such time as such Registration Statement has been declared effective by the Commission
(unless the Initiating Holders withdraw their request for such registration, other than as a result of information concerning the business or financial condition of the Company which is made known to
the Stockholders after the date on which such registration was requested, and elect not to pay the Registration Expenses therefor pursuant to Section 2.4). 

        (g)   If
at the time of any request to register Registrable Shares by Initiating Holders pursuant to this Section 2.1, the Company is engaged or has plans to engage in
a registered public offering or is engaged in any other activity which, in the good faith determination of the Company's Board of Directors, would be adversely affected by the requested registration,
then the Company may at 

6

 

its
option direct that such request be delayed for a period not in excess of 120 days from the date of such request, such right to delay a request to be exercised by the Company not more than
once in any 12-month period. 

        2.2.    Incidental Registration.    

        (a)   Whenever
the Company proposes to file a Registration Statement (other than a Registration Statement filed pursuant to Section 2.1 or in connection with its
Initial Public Offering), at any time and from time to time, it will, prior to such filing, give written notice to all Stockholders of its intention to do so;  provided, however, that no such notice need be given if no Registrable Shares are to be included therein
as a result of a determination of the managing underwriter pursuant to Section 2.2(b). Upon the written request of a Stockholder or Stockholders, given within 20 days after the Company
provides such notice (which request shall state the intended method of disposition of such Registrable Shares or Common Stock, as applicable), the Company shall use its reasonable best efforts to
cause all Registrable Shares which the Company has been requested by such Stockholder or Stockholders to be registered under the Securities Act to the extent necessary to permit their sale or other
disposition in accordance with the intended methods of distribution specified in such request; provided that the Company shall have the right to postpone or withdraw any registration effected pursuant
to this Section 2.2 without obligation to any Stockholder. 

        (b)   If
the registration for which the Company gives notice pursuant to Section 2.2(a) is a registered public offering involving an underwriting, the Company shall so
advise the Stockholders as a part of the written notice given pursuant to Section 2.2(a). In such event, the right of any Stockholder to include its Registrable Shares in such registration
pursuant to Section 2.2 shall be conditioned upon such Stockholder's participation in such underwriting on the terms set forth herein. All Stockholders proposing to distribute their securities
through such underwriting shall (together with the Company, Other Holders, and any officers or directors distributing their securities through such underwriting) enter into an underwriting agreement
in customary form with the underwriter or underwriters selected for the underwriting by the Company. Notwithstanding any other provision of this Section 2.2, if the managing underwriter
determines that the inclusion of all shares requested to be registered would adversely affect the offering, the Company may limit (to zero) the number of Registrable Shares to be included in the
registration and underwriting. The Company shall so advise all holders of Registrable Shares requesting registration, and the number of shares that are entitled to be included in the registration and
underwriting shall be allocated in the following manner: the securities of the Company held by officers and directors of the Company (other than Registrable Shares) shall be excluded from such
registration and underwriting to the extent deemed advisable by the managing underwriter, and, if a further limitation on the number of shares is required, the number of shares that may be included in
such registration and underwriting shall be allocated among all Stockholders and Other Holders requesting registration in proportion, as nearly as practicable, to the respective number of shares of
Common Stock (on an as-converted basis) which they held at the time the Company gave the notice specified in Section 2.2(a). If any Stockholder or Other Holder would thus be
entitled to include more securities than such holder requested to be registered, the excess shall be allocated among other requesting Stockholders and Other Holders pro rata in the manner described in
the preceding sentence. If any holder of Registrable Shares or any officer, director or Other Holder disapproves of the terms of any such underwriting, such person may elect to withdraw therefrom by
written notice to the Company, and any Registrable Shares or other securities excluded or withdrawn from such underwriting shall be withdrawn from such registration. 

        (c)   The
Company shall have the right to select the managing underwriter for any underwritten offering requested pursuant to Section 2.2, subject to the approval of
the holders of 662/3% of the Registrable Shares, which approval will not be unreasonably withheld. 

7

 

        2.3.    Registration Procedures.    

        (a)   If
and whenever the Company is required by the provisions of this Agreement to use its reasonable best efforts to effect the registration of any Registrable Shares under
the Securities Act, the Company shall: 

          (i)  file
with the Commission a Registration Statement with respect to such Registrable Shares and use its reasonable best efforts to cause that Registration Statement to
become and remain effective for 120 days from the effective date or such lesser period until all such Registrable Shares are sold; provided,  however,
that such 120-day period shall be extended for a period of time equal to the period the Selling Stockholder refrains, at the
request of an underwriter of Common Stock (or other securities) of the Company, from selling any securities included in such registration; 

         (ii)  as
expeditiously as possible prepare and file with the Commission any amendments and supplements to the Registration Statement and the Prospectus as may be necessary to
comply with the provisions of the Securities Act (including the anti-fraud provisions thereof) and to keep the Registration Statement effective for 120 days from the effective date
or such lesser period until all such Registrable Shares are sold; 

        (iii)  as
expeditiously as possible furnish to each Selling Stockholder such reasonable number of copies of the Prospectus, including any preliminary prospectus, in
conformity with the requirements of the Securities Act, and such other documents as such Selling Stockholder may reasonably request in order
to facilitate the public sale or other disposition of the Registrable Shares owned by such Selling Stockholder; 

        (iv)  as
expeditiously as possible, use its reasonable best efforts, register or qualify the Registrable Shares covered by the Registration Statement under the securities or
Blue Sky laws of such states as the Selling Stockholders shall reasonably request, and do any and all other acts and things that may be necessary or desirable to enable the Selling Stockholders to
consummate the public sale or other disposition in such states of the Registrable Shares owned by the Selling Stockholder; provided,  however, that the
Company shall not be required in connection with this paragraph (iv) to qualify as a foreign corporation or execute a general
consent to service of process in any jurisdiction; 

         (v)  as
expeditiously as possible, cause all such Registrable Shares to be listed on each securities exchange or automated quotation system on which similar securities issued
by the Company are then listed; 

        (vi)  promptly
provide a transfer agent and registrar for all such Registrable Shares not later than the effective date of such registration statement; 

       (vii)  promptly
make available for inspection by the Selling Stockholders, any managing underwriter participating in any disposition pursuant to such Registration Statement,
and any attorney or accountant or other agent retained by any such underwriter or selected by the Selling Stockholders, all financial and other records, pertinent corporate documents and properties of
the Company and cause the Company's officers, directors, employees and independent accountants to supply all information reasonably requested by any such seller, underwriter, attorney, accountant or
agent in connection with such Registration Statement; 

      (viii)  as
expeditiously as possible, notify each Selling Stockholder of the time when such Registration Statement has become effective or a supplement to any Prospectus
forming a part of such Registration Statement has been filed; and 

8

 

 

        (ix)  as
expeditiously as possible following the effectiveness of such Registration Statement, notify each Selling Stockholder of such Registrable Shares of any request by
the Commission for the amending or supplementing of such Registration Statement or Prospectus. 

        (b)   If
the Company has delivered a Prospectus to the Selling Stockholders, and after having done so the Prospectus is amended to comply with the requirements of the
Securities Act, the Company shall promptly notify the Selling Stockholders of such amendment and, if necessary, request that the Selling Stockholders immediately cease making offers of Registrable
Shares and return all Prospectuses to the Company. The Company shall promptly provide the Selling Stockholders with revised Prospectuses and, following receipt of the revised Prospectuses, the Selling
Stockholders shall be free to resume making offers of the Registrable Shares. 

        (c)   In
the event that, in the judgment of the Company, it is advisable to suspend use of a Prospectus included in a Registration Statement due to pending material
developments or other events that have not yet been publicly disclosed and as to which the Company believes public disclosure would be detrimental to the Company, the Company shall, as expeditiously
as possible, notify all Selling Stockholders to such effect, and, upon receipt of such notice, each such Selling Stockholder shall immediately discontinue any sales of Registrable Shares pursuant to
such Registration Statement until such Selling Stockholder has received copies of a supplemented or amended Prospectus or until such Selling Stockholder is advised in writing by the Company that the
then current Prospectus may be used and has received copies of any additional or supplemental filings that are incorporated or deemed incorporated by reference in such Prospectus. Notwithstanding
anything to the contrary herein, the Company shall not exercise its rights under this Section 2.3(c) to suspend sales of Registrable Shares for a period in excess of 90 days in any
365-day period. 

        (d)   The
Company shall, as promptly as practicable after becoming aware thereof, notify each Selling Stockholder of the happening of any event of which the Company has
knowledge, as a result of which the prospectus included in the Registration Statement, as then in effect, includes an untrue statement of a material fact or omits to state a material fact required to
be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading, and
use its reasonable best efforts to promptly prepare and file with the Commission a supplement or amendment to the Registration Statement or other appropriate filing with the Commission to correct such
untrue statement or omission, and deliver a number of copies of such supplement or amendment to each Selling Stockholder selling Registrable Securities pursuant to such Registration Statement as such
Selling Stockholder may reasonably request. 

        2.4.    Allocation of Expenses.    The Company will pay all Registration Expenses for all registrations under this
Agreement; provided, however, that if a registration under Section 2.1 is withdrawn at the request of the Initiating Holders (other than as a result of information concerning the business or
financial condition of the Company which is made known to the Stockholders after the date on which such registration was requested) and if the Initiating Holders elect not to have such registration
counted as a registration requested under Section 2.1, the requesting Stockholders shall pay the Registration Expenses of such registration pro rata in accordance with the number of their
Registrable Shares included in such registration. For purposes of this Section, the term "Registration Expenses" shall mean all expenses incurred by the Company in complying with this Agreement,
including, without limitation, all registration and filing fees, exchange listing fees, printing expenses, fees and expenses of counsel for the Company and the fees and expenses of one counsel
selected by the Selling Stockholders to represent the Selling Stockholders, state Blue Sky fees and expenses, and the expense of any special audits incident to or required by any such registration,
but excluding underwriting discounts, selling commissions and the fees and expenses of Selling Stockholders' own counsel (other than the counsel selected to represent all Selling Stockholders). 

9

 

        2.5.    Indemnification and Contribution.    

        (a)   In
the event of any registration of any of the Registrable Shares under the Securities Act pursuant to this Agreement, the Company will indemnify and hold harmless the
seller of such Registrable Shares, each of its directors, partners, and officers, each underwriter of such Registrable Shares, and each other person, if any, who controls such seller or underwriter
within the meaning of the Securities Act or the Exchange Act against any losses, claims, damages or liabilities, joint or several, to which such seller, underwriter or controlling person may become
subject under the Securities Act, the Exchange Act, state securities or Blue Sky laws or otherwise, insofar as such losses, claims, damages or liabilities (or actions in respect thereof) arise out of
or are based upon any untrue statement or alleged untrue statement of any material fact contained in any Registration Statement under which such Registrable Shares were registered under the Securities
Act, any preliminary prospectus or final prospectus contained in the Registration Statement, or any amendment or supplement to such Registration Statement, or arise out of or are based upon the
omission or alleged omission to state a material fact required to be stated therein or necessary to make the statements therein not misleading; and the Company will reimburse such seller, underwriter
and each such controlling person for any legal or any other expenses reasonably incurred by such seller, underwriter or controlling person in connection with investigating or defending any such loss,
claim, damage, liability or action; provided, however, that the Company will not be liable in any such case to the extent that any such loss, claim,
damage or liability arises out of or is based upon any untrue statement or omission made in such Registration Statement, preliminary prospectus or prospectus, or any such amendment or supplement, in
reliance upon and in strict conformity with information regarding such seller, underwriter or controlling person furnished to the Company, in writing, by or on behalf of such seller, underwriter or
controlling person, respectively, specifically for use in the preparation thereof or to the extent that such loss, claim, damage or liability arises out of such seller's failure to deliver a copy of
the preliminary or final prospectus or any amendment or supplement thereto. 

        (b)   In
the event of any registration of any of the Registrable Shares under the Securities Act pursuant to this Agreement, each seller of Registrable Shares, severally and
not jointly, will indemnify and hold harmless the Company, each of its directors and officers and each underwriter (if any) and each person, if any, who controls the Company or any such underwriter
within the meaning of the Securities Act or the Exchange Act, against any losses, claims, damages or liabilities, joint or several, to which the Company, such directors and officers, underwriter or
controlling person may become subject under the Securities Act, Exchange Act, state securities or Blue Sky laws or otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged untrue statement of a material fact contained in any Registration Statement under which such Registrable Shares were
registered under the Securities Act, any preliminary prospectus or final prospectus contained in the Registration Statement, or any amendment or supplement to the Registration Statement, or arise out
of or are based upon any omission or alleged omission to state a material fact required to be stated therein or necessary to make the statements therein not misleading, if the statement or omission
was made in reliance upon and in strict conformity with information relating to such seller furnished in writing to the Company by or on behalf of such seller specifically for use in connection with
the preparation of such Registration Statement, prospectus, amendment or supplement; provided, however, that the obligations of a Stockholder hereunder shall be limited to an amount equal to the net
proceeds to such Stockholder of Registrable Shares sold in connection with such registration. 

        (c)   Each
party entitled to indemnification under this Section (the "Indemnified Party") shall give notice to the party required to provide indemnification (the "Indemnifying
Party") promptly after such Indemnified Party has actual knowledge of any claim as to which indemnity may be 

10

 

sought,
and shall permit the Indemnifying Party to assume the defense of any such claim or any litigation resulting therefrom; provided, that counsel
for the Indemnifying Party, who shall conduct the defense of such claim or litigation, shall be approved by the Indemnified Party (whose approval shall not be unreasonably withheld); and,  provided,
further, that the failure of any Indemnified Party to give notice as provided herein shall not
relieve the Indemnifying Party of its obligations under this Section except to the extent that the Indemnifying Party is adversely affected by such failure. The Indemnified Party may participate in
such defense at such party's expense; provided, however, that the Indemnifying Party shall pay such
expense if representation of such Indemnified Party by the counsel retained by the Indemnifying Party would be inappropriate due to actual or potential differing interests between the Indemnified
Party and any other party represented by such counsel in such proceeding; provided further that in no event shall the Indemnifying Party be required to
pay the expenses of more than one law firm per jurisdiction as counsel for the Indemnified Party. The Indemnifying Party also shall be responsible for the expenses of such defense if the Indemnifying
Party does not elect to assume such defense. No Indemnifying Party, in the defense of any such claim or litigation shall, except with the
consent of each Indemnified Party, consent to entry of any judgment or enter into any settlement which does not include as an unconditional term thereof the giving by the claimant or plaintiff to such
Indemnified Party of a release from all liability in respect of such claim or litigation, and no Indemnified Party shall consent to entry of any judgment or settle such claim or litigation without the
prior written consent of the Indemnifying Party, which consent shall not be unreasonably withheld. 

        (d)   In
order to provide for just and equitable contribution in circumstances in which the indemnification provided for in this Section 2.5 is due in accordance with
its terms but for any reason is held to be unavailable to an Indemnified Party in respect to any losses, claims, damages and liabilities referred to herein, then the Indemnifying Party shall, in lieu
of indemnifying such Indemnified Party, contribute to the amount paid or payable by such Indemnified Party as a result of such losses, claims, damages or liabilities to which such party may be subject
in such proportion as is appropriate to reflect the relative fault of the Company on the one hand and the Stockholders on the other in connection with the statements or omissions which resulted in
such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative fault of the Company and the Stockholders shall be determined by reference to, among
other things, whether the untrue or alleged untrue statement of material fact related to information supplied by the Company or the Stockholders and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission. The Company and the Stockholders agree that it would not be just and equitable if contribution pursuant to this
Section 2.5 were determined by pro rata allocation or by any other method of allocation which does not take account of the equitable considerations referred to above. Notwithstanding the
provisions of this paragraph of Section 2.5, (a) in no case shall any one Stockholder be liable or responsible for any amount in excess of the net proceeds received by such Stockholder
from the offering of Registrable Shares and (b) the Company shall be liable and responsible for any amount in excess of such proceeds; provided, however, that no person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. Any
party entitled to contribution will, promptly after receipt of notice of commencement of any action, suit or proceeding against such party in respect of which a claim for contribution may be made
against another party or parties under this Section 2.5, notify such party or parties from whom contribution may be sought, but the omission so to notify such party or parties from whom
contribution may be sought shall not relieve such party from any other obligation it or they may have thereunder or otherwise under this Section. No party shall be liable for contribution with respect
to any action, suit, proceeding or claim settled without its prior written consent, which consent shall not be unreasonably withheld. 

11

 

        2.6.    Other Matters with Respect to Underwritten Offerings.    In the event that Registrable Shares are sold
pursuant to a Registration Statement in an underwritten offering pursuant to Section 2.1, the Company agrees to (a) enter into an underwriting agreement containing customary
representations and warranties with respect to the business and operations of the Company and customary covenants and agreements to be performed by the Company, including without limitation customary
provisions with respect to indemnification by the Company of the underwriters of such offering; (b) use its reasonable best efforts to cause its legal counsel to render customary opinions to
the underwriters with respect to the Registration Statement; and (c) use its reasonable best efforts to cause its independent public
accounting firm to issue customary "cold comfort letters" to the underwriters with respect to the Registration Statement. 

        2.7.    Information by Holder.    As a condition to the Company's obligation to register the Registrable Shares of any
holder, such holder shall furnish to the Company such information regarding such holder and the distribution proposed by such holder as the Company may reasonably request in writing and as shall be
required in connection with any registration, qualification or compliance referred to in this Agreement. 

        2.8.    "Stand-Off" Agreement; Confidentiality of Notices.    Each Stockholder agrees not to sell or
otherwise transfer or dispose of any Registrable Shares or other securities of the Company held by such Stockholder for a period specified by the representative of the underwriters of Common Stock or
other securities of the Company not to exceed 180 days following the effective date of a Registration Statement for an offering by the Company of Common Stock or other securities of the
Company, which period may be extended upon the request of the managing underwriter, to the extent required by any NASD rules, for an additional period of up to fifteen days if the Company issues or
proposes to issue an earnings or other public release within fifteen days of the expiration of the 180-day period. Each Stockholder agrees to execute a "lock-up" agreement with
the Company and the underwriters of such offering confirming such agreement if requested by the Company; provided that: 

        (a)   such
agreements set forth in this Section 2.8 shall only apply to the Initial Public Offering of Common Stock of the Company to be sold by or on behalf of the
Company in an underwritten offering and shall not apply to the sale of any shares to an underwriter pursuant to an underwriting agreement; and 

        (b)   all
stockholders of the Company then holding at least 5% of the outstanding Common Stock (on an as-converted basis) and all officers and directors of the
Company enter into similar agreements. 

        As
a condition to the obligation of the Stockholders under this Section 2.8, the Company agrees to use its reasonable best efforts to ensure that the "lock-up"
obligation of the Stockholders under this Section 2.8, and any agreement entered into by the Stockholders as a result of their obligations under this Section 2.8, shall (i) allow
for periodic early releases of portions of the securities subject to such "lock-up" obligations, which may be conditioned upon the trading price of the Company's Common Stock and
(ii) provide that all Stockholders will participate on a pro-rata basis in any early release of any stockholder. 

        The
Company may impose stop-transfer instructions with respect to the Registrable Shares or other securities subject to the foregoing restriction until the end of such
180-day period. 

        Any
Stockholder receiving any written notice from the Company regarding the Company's plans to file a Registration Statement shall treat such notice confidentially and shall not
disclose such information to any person other than as necessary to exercise its rights under this Agreement. 

12

 

  
        2.9.    Limitations on Subsequent Registration Rights.    The Company shall not, without the prior written consent
of
the Investors holding at least 662/3% of the Registrable Shares then held by all Investors, enter into any agreement (other than this Agreement) with any holder or prospective holder of
any securities of the Company which grant such holder or prospective holder rights to include securities of the Company in any Registration Statement, unless (a) such rights to include
securities in a registration initiated by the Company or by Stockholders are not more favorable than the rights granted to Other Holders under this Agreement and (b) no rights are granted to
initiate a registration prior to the date six months following the date which Investors may initiate a negotiation as set forth herein. 

        2.10.    Rule 144 Requirements.    After the earliest of (i) the closing of the sale of securities of
the Company pursuant to a Registration Statement, (ii) the registration by the Company of a class of securities under Section 12 of the Exchange Act, or (iii) the issuance by the
Company of an offering circular pursuant to Regulation A under the Securities Act, the Company agrees to: 

        (a)   make
and keep current public information about the Company available, as those terms are understood and defined in Rule 144; 

        (b)   use
its reasonable best efforts to file with the Commission in a timely manner all reports and other documents required of the Company under the Securities Act and the
Exchange Act (at any time after it has become subject to such reporting requirements); and 

        (c)   furnish
to any holder of Registrable Shares upon request (i) a written statement by the Company as to its compliance with the reporting requirements of
Rule 144 and of the Securities Act and the Exchange Act (at any time after it has become subject to such reporting requirements), (ii) a copy of the most recent annual or quarterly
report of the Company, and (iii) such other reports and documents of the Company as such holder may reasonably request to avail itself of any similar rule or regulation of the Commission
allowing it to sell any such securities without registration. 

        2.11.    Termination.    All of the Company's obligations to register Registrable Shares under Sections 2.1 and
2.2 of this Agreement shall terminate three years after the closing of the Initial Public Offering. 

        3.    Right Of First Refusal    

        3.1.    Rights of Investors.    

        (a)   The
Company shall not issue, sell or exchange, agree to issue, sell or exchange, or reserve or set aside for issuance, sale or exchange, (i) any shares of its
Common Stock, (ii) any other equity securities of the Company, including, without limitation, shares of preferred stock, (iii) any option, warrant or other right to subscribe for,
purchase or otherwise acquire any equity securities of the Company, or (iv) any debt securities convertible into capital stock of the Company (collectively, the "Offered Securities"), unless in
each such case the Company shall have first complied with this Section 3.1. The Company shall deliver to each Investor and M.I.T. in accordance with Section 8(d) below a written notice
of any proposed or intended issuance, sale or exchange of Offered Securities (the "Offer"), which Offer shall (i) identify and describe the Offered Securities, (ii) describe the price
and other terms upon which they are to be issued, sold or exchanged, and the number or amount of the Offered Securities to be issued, sold or exchanged, (iii) identify the persons or entities
(if known) to which or with which the Offered Securities are to be offered, issued, sold or exchanged and (iv) offer to issue and sell to or exchange with such Investor and M.I.T.
(I) (A) in the case of an Investor, such portion of the Offered Securities as is equal to (1) 75% of the Offered Securities multiplied by (2) a fraction, the numerator of which is
the aggregate number of shares of Common Stock issued or issuable upon conversion of the Shares held by such Investor and the denominator of which is the total number 

13

 

of
shares of Common Stock issued or issuable upon conversion of the Shares held by all Investors and (B) in the case of M.I.T. solely in its capacity as a holder of the M.I.T. Shares, a pro
rata portion of the Offered Securities determined by dividing the aggregate number of M.I.T. Shares then held by M.I.T. by the total number of shares of Common Stock then outstanding (giving effect to
the conversion of all outstanding convertible securities of the Company) (in either case (A) or (B), the "Basic Amount"), and (II) in the case of an Investor, any additional portion of
the Offered Securities attributable to the aggregate Basic Amount of other Investors as such Investor shall indicate it will purchase or acquire should any other Investor subscribe for less than its
Basic Amount (the "Undersubscription Amount"). If more than one Investor indicates that it wishes to purchase the Undersubscription Amount, or a portion thereof, and the Undersubscription Amount is
not sufficient to allow all such Investors to purchase the amounts indicated, the Undersubscription Amount shall be allocated among such Investors pro rata according to the number of shares of Common
Stock issued or issuable upon conversion of the Shares held by each Investor. Each Investor shall have the right, for a period of thirty (30) days following the delivery to such Investor of
written notice of such Offer, to purchase or acquire, at the price and upon the other terms specified in the Offer, the number and amount of Offered Securities described above. Notwithstanding
anything to the contrary, for so long as any Investor shall be a Regulated Holder (as defined in the Company's Tenth Amended and Restated Certificate of Incorporation, as may be amended and/or
restated from time to time) in no event shall such Regulated Holder purchase a number of Offered Securities which would result in such Regulated Holder owning
or controlling, directly or indirectly, an aggregate amount of the Company's capital securities greater than permitted by applicable law, including without limitation, Regulation Y (as such
regulation would apply to a Regulated Holder that is not a financial holding company or subsidiary of a financial holding company authorized to engage in merchant banking activities pursuant to
Section 4(k)4(H) of the Bank Holding Company Act of 1956, as amended ("BHCA")) . 

        (b)   To
accept an Offer, in whole or in part, an Investor and/or M.I.T. must deliver a written notice to the Company prior to the end of the 30-day period of the
Offer, setting forth the portion of his or its Basic Amount that such Investor and/or M.I.T. elects to purchase and, in the case of Investors, if such Investor shall elect to purchase all of its Basic
Amount, the Undersubscription Amount (if any) that such Investor elects to purchase (the "Notice of Acceptance"). If the Basic Amounts subscribed for by all Investors are less than the total of all of
the Basic Amounts available for purchase by Investors, then each Investor who has set forth an Undersubscription Amount in its Notice of Acceptance shall be entitled to purchase, in addition to the
Basic Amount it subscribed for, the Undersubscription Amount it has subscribed for; provided, however,
that if more than one Investor indicates that it wishes to purchase the Undersubscription Amount, or a portion thereof, and the Undersubscription Amount is not sufficient to allow all such Investors
to purchase the amounts indicated, the Undersubscription Amount shall be allocated among such Investors pro rata according to the number of shares of Common Stock issued or issuable upon conversion of
the Shares held by each Investor. 

        (c)   The
Company shall have 90 days from the expiration of the period set forth in Section 3.1(b) above to issue, sell or exchange all or any part of such
Offered Securities as to which a Notice of Acceptance has not been given by the Investors or M.I.T. (the "Refused Securities"), but only to the offerees or purchasers described in the Offer (if so
described therein) and only upon (i) the same unit prices and interest rates and (ii) terms and conditions which are not more favorable, in the aggregate, to the acquiring person or
persons or less favorable to the Company, in each case, than those set forth in the Offer. 

        (d)   In
the event the Company shall propose to sell less than all the Refused Securities (any such sale to be in the manner and on the terms specified in
Section 3.1(c) above), then each Investor and M.I.T. may, at its sole option and in its sole discretion, reduce the number or amount 

14

 

of
the Offered Securities specified in its Notice of Acceptance to an amount that shall be not less than the number or amount of the Offered Securities that the Investor or M.I.T. elected to purchase
pursuant to Section 3.1(b) above multiplied by a fraction, (i) the numerator of which shall be the number or amount of Offered Securities the Company actually proposes to issue, sell or
exchange (including Offered Securities to be issued or sold to Investors pursuant to Section 3.1(b) above prior to such reduction) and (ii) the denominator of which shall be the original
amount of the Offered Securities. In the event that any Investor or M.I.T. so elects to reduce the number or amount of Offered Securities specified in its Notice of Acceptance, the Company may not
issue, sell or exchange more than the reduced number or amount of the Offered Securities unless and until such securities have again been offered to the Investors and M.I.T. in accordance with
Section 3.1(a) above. 

        (e)   Upon
the closing of the issuance, sale or exchange of all or less than all of the Refused Securities, the Investors and M.I.T. shall acquire from the Company, and the
Company shall issue to the Investors and M.I.T., the number or amount of Offered Securities specified in the Notices of Acceptance, as reduced pursuant to Section 3.1(d) above if the Investors
or M.I.T. have so elected, upon the terms and conditions specified in the Offer. The purchase by the Investors and M.I.T. of any Offered Securities is subject in all cases to the preparation,
execution and delivery by the Company, the Investors and M.I.T. of a purchase agreement relating to such Offered Securities reasonably satisfactory in form and substance to the Investors, M.I.T. and
the Company. 

        (f)    Any
Offered Securities not acquired by the Investors, M.I.T. or other persons in accordance with Section 3.1(c) above may not be issued, sold or exchanged until
they are again offered to the Investors and M.I.T. under the procedures specified in this Agreement. 

        (g)   The
rights of the Investors and M.I.T. under this Section 3 shall not apply to: 

          (i)  Common
Stock issued as a stock dividend or distribution to holders of Common Stock, Series A Preferred, Series A-1 Preferred, Series B
Preferred, Series B-1 Preferred, Series C Preferred, Series D Preferred, Series E Preferred or Series F Preferred Stock or upon any subdivision or
combination of shares of Common Stock, Series A Preferred, Series A-1 Preferred, Series B Preferred, Series B-1 Preferred, Series C
Preferred, Series D Preferred, Series E Preferred or Series F Preferred Stock; 

         (ii)  the
issuance of any shares of Common Stock upon conversion or exchange of shares of convertible preferred stock; 

        (iii)  the
issuance of up to an aggregate of 13,700,000 shares of Common Stock (or such higher number as may be approved by a majority of the Board of Directors of the
Company including the approval of the three members of the Board of Directors of the Corporation designated by the holders of the Company's preferred stock pursuant to the Sixth Amended and Restated
Stockholders' Voting Agreement dated as of the date hereof (the "Voting Agreement") among the parties thereto (the "Preferred Designees")), or the grant of options therefor (including shares of Common
Stock, or the grant of options therefor, issued prior and subsequent to the date of this Agreement), issuable to officers, directors, consultants and employees of the Company or any subsidiary,
pursuant to the Company's 2001 Stock Incentive Plan (the "Plan") or the issuance of additional shares pursuant to the Plan or any other plan, agreement or arrangement, in each case, approved by a
majority of the Board of Directors of the Company, including the Preferred Designees (it being understood that any shares subject to options that expire or terminate unexercised shall not count
towards the maximum number set forth in this clause (iii)); 

        (iv)  securities
issued solely in consideration for the acquisition (whether by merger or otherwise) by the Company or any of its subsidiaries of all or substantially all of
the stock or 

15

 

assets
of any other entity in a transaction approved by a majority of the Board of Directors of the Company (which majority shall include the approval of the Preferred Designees); 

         (v)  securities
sold by the Company in an underwritten public offering pursuant to an effective registration statement under the Securities Act; 

        (vi)  the
issuance of shares of capital stock of the Company, or the grant of any warrants therefor, in connection with any present or future borrowing, loan, line of credit,
leasing or similar financing arrangement approved by a majority of the members of the Board of Directors (which majority shall include the approval of the Preferred Designees); 

       (vii)  the
issuance of the M.I.T. Shares; 

      (viii)  the
issuance of shares of Series B Preferred upon exercise of the Series B Warrant; 

        (ix)  the
issuance of shares of Series C Preferred upon exercise of the Series C Warrants; and 

         (x)  the
issuance of shares of Series F Preferred pursuant to the Series F Purchase Agreement. 

        3.2.    Termination.    This Section 3 shall terminate upon the earlier of the following events: 

        (a)   The
sale of all or substantially all of the assets or business of the Company, by merger, sale of assets or otherwise (except a merger or consolidation in which the
holders of capital stock of the Company immediately prior to such merger or consolidation continue to hold immediately following such merger or consolidation at least a majority of the voting power of
the capital stock of the surviving corporation); or 

        (b)   The
closing of the Initial Public Offering. 

        4.    Affirmative Covenants of the Company.    

        4.1.    Inspection and Observation.    The Company shall permit each Significant Stockholder (as defined in
Section 4.2) or any authorized representative thereof, to visit and inspect the properties of the Company, including its corporate and financial records, and to discuss its business and
finances with officers of the Company, during normal business hours and without disruption of the Company's business following reasonable notice and as often as may be reasonably requested; provided
that the Company may limit access to information that the Board of Directors of the Company determines, in good faith, is confidential or attorney-client-privileged and should not, therefore, be
disclosed. In addition, for so long as GE Capital Equity Investments, Inc. ("GE") is a Significant Stockholder, the Company shall permit a qualified third-party identified by GE to conduct, at
GE's expense, an employee, health and safety inspection ("EHS Inspection") of the Company's manufacturing facilities no more than once every twelve months, during normal business hours and without
disruption of the Company's business following reasonable notice. GE shall promptly provide the Company with a copy of the results of, and any related report resulting from, any such EHS Inspection
and such report shall be deemed confidential. If GE ever ceases to be a Significant Stockholder, the foregoing EHS Inspection right shall run to the Significant Stockholders as a class and the
expenses of such inspection shall be borne equally among the electing Significant Stockholder(s). 

        4.2.    Financial Statements and Other Information.    The Company shall deliver to each Significant Stockholder: 

        (a)   within
90 days after the end of each fiscal year of the Company, an audited balance sheet of the Company as at the end of such year and audited statements of
income and of cash flows of the Company for such year, certified by certified public accountants of recognized regional standing selected by the Company, which independent accountants shall be one of
the "big-four" 

16

 

United
States accounting firms, and prepared in accordance with GAAP; provided however, the Company shall have 120 days to provide such audited financials in the event it would incur material
additional expenses by providing such materials within such 90-day period. 

        (b)   within
45 days after the end of each fiscal quarter of the Company (other than the last quarter in each fiscal year), an unaudited balance sheet of the Company as
at the end of such quarter, and unaudited statements of income and of cash flows of the Company for such fiscal quarter and for the current fiscal year to the end of such fiscal quarter; 

        (c)   within
30 days after the end of each month (other than the last month of each fiscal year), an unaudited balance sheet of the Company as at the end of such month
and unaudited statements of
income and of cash flows of the Company for such month and for the current fiscal year to the end of such month, setting forth in comparative form the Company's projected financial statements for the
corresponding periods for the current fiscal year; 

        (d)   as
soon as available, but in any event prior to the commencement of each new fiscal year, a budget, consisting of a business plan and projected financial statements for
such fiscal year; 

        (e)   such
other notices, information and data with respect to the Company as the Company delivers to the holders of its capital stock generally at the same time it delivers
such items to such holders; and 

        (f)    with
reasonable promptness, such other information and data as such Significant Stockholder may from time to time reasonably request. 

        The
foregoing financial statements shall be prepared on a consolidated basis if the Company then has any subsidiaries. The financial statements delivered pursuant to clause 4.2(b)
and clause 4.2(c) above shall be accompanied by a certificate of the chief financial officer of the Company stating that such statements have been prepared in accordance with GAAP consistently
applied (except as noted) and fairly present the financial condition and results of operations of the Company at the date thereof and for the periods covered thereby. 

        As
used herein, "Significant Stockholder" shall mean an Investor or Common Investor who holds not less than 450,000 (subject to appropriate adjustment in the event of any stock dividend,
stock split, combination or other similar recapitalization affecting such shares) Shares. For purposes of determining the number of Shares held by an Investor or a Common Investor: (i) the
foregoing numbers shall be adjusted for any stock splits, stock dividends, recapitalizations or similar events; (ii) Shares shall include Shares which have been converted into Common Stock, so
long as such Common Stock is held by such Investor or such Investor's affiliates; and (iii) Shares shall include Shares held by affiliates of such Investor or Common Investor, and with respect
to an Investor or Common Investor that is a corporation or partnership, Shares that are distributed to its shareholders or partners. 

        4.3.    Material Changes and Litigation.    The Company shall promptly notify the Significant Stockholders of
(a) any material adverse change in the business, prospects, assets or condition, financial or otherwise, of the Company and (b) any litigation or governmental proceeding or investigation
brought or, to the Company's knowledge, threatened against the Company, or against any Founder, officer, director, key employee or principal stockholder of the Company which could reasonably be
expected to have a material adverse effect on the Company. 

        4.4.    Environmental Compliance.    The Company shall (a) comply in all material respects with all applicable
Environmental Laws, which compliance includes obtaining, maintaining, and complying with all permits required under Environmental Law, and (b) provide to the Board of Directors and Significant
Stockholders a written report prepared by a qualified environmental professional that indicates the Company's compliance under Environmental Law as well as the reasonable estimated cost of any
required corrective measures to address any non-compliance or remedial action, such report 

17

 

shall
be provided every six months. Should Significant Stockholders (i) be notified under Section 4.3 or (ii) reasonably believe that the Company has violated this
Section 4.4, the Significant Stockholders shall be entitled to visit and inspect the properties of the Company pursuant to Section 4.1. "Environmental Law" means any federal, state,
local or analogous foreign law, directive, statute, rule or regulation or the common law relating to pollution, the protection of human health, the environment or natural resources, including, without
limitation, the Comprehensive Environmental Response, Compensation and Liability Act, the Resource Conservation and Recovery Act, the Hazardous Materials Transportation Act, the Hazardous Materials
Transportation Act, the Clean Water Act, the Clean Air Act, the Toxic Substances Control Act, the Occupational Health and Safety Act, and the Oil Pollution Act and any statute, regulation or order
pertaining to (i) the treatment, storage, disposal, generation transportation or importation of Hazardous Materials; (ii) the release or threatened release into the environment of
Hazardous Materials, and (iii) the manufacture, processing, use, distribution, treatment, storage, disposal, transportation or handling of Hazardous Materials. "Hazardous Material" is defined
as a material, substance or waste that is regulated, characterized, or otherwise defined as toxic, hazardous, a pollutant, or a contaminant under Environmental Law. 

        4.5.    Key Man Insurance.    The Company shall maintain term life insurance upon the lives of each of Bart Riley,
David Vieau and Yet-Ming Chiang each in the amount of $1,000,000, with the proceeds payable to the Company. 

        4.6.    Agreements with Employees and Consultants.    

          (i)  The
Company shall require all persons now or hereafter employed by, or consulting with, the Company to enter into proprietary information and invention agreements
substantially in the form of Exhibit I-1 to the Series F Purchase Agreement. The Company shall require all persons at or above
the director level to enter into non-competition and non-solicitation agreements substantially in the form of  Exhibit I-2 to the Series F Purchase Agreement or such other form as may be
approved by the Board of Directors of the Company. 

         (ii)  Other
than options or restricted stock granted to the Founders (which shall be governed by the terms of the applicable Founder's Restricted Stock Agreement between the
Company and each Founder), unless otherwise agreed by a majority of the members of the Board of Directors (which majority shall include the Preferred Designees pursuant to the Voting Agreement, all
options or
restricted stock granted or issued under the Plan shall become exercisable at the rate of 25% on the one-year anniversary of the date of grant with the remainder vesting in equal monthly
installments (2.083%) over the subsequent three (3) years so long as the holder continues to be an employee or consultant of the Company; provided, however, that twelve (12) months of
vesting shall accelerate in the event of (i) the sale, transfer or other disposition of all or substantially all of the Company's assets or (ii) the consummation of a consolidation or
merger of the Company into or with any other entity or entities or any other corporate reorganization, if persons who were not stockholders of the Company immediately prior to such merger,
consolidation or other reorganization own immediately after such merger, consolidation or other reorganization fifty percent (50%) or more of the voting power of the outstanding securities of each of
(x) the continuing or surviving entity and (y) any direct or indirect parent corporation of such continuing or surviving entity. 

        4.7.    Directors.    

          (i)  The
Company shall promptly reimburse in full each Preferred Designee for all of his reasonable out-of-pocket expenses incurred in attending each
meeting of the Board of Directors of the Company or any committee thereof. 

         (ii)  The
Board of Directors shall meet on at least a bi-monthly basis, unless otherwise agreed by all of the members of the Board of Directors. 

18

 

        (iii)  The
Company shall maintain director and officer liability insurance for each of its directors and officers. 

        4.8.    Reservation of Common Stock.    The Company shall reserve and maintain a sufficient number of shares of Common
Stock for issuance upon conversion of all of the outstanding Shares. 

        4.9.    Related Party Transactions.    

          (i)  Except
for transactions on customary terms related to such person's employment, the Company shall not enter into any agreement with any stockholder, officer or director
of the Company, or any "affiliate" or "associate" of such persons (as such terms are defined in the rules and regulations promulgated under the Securities Act), including, without limitation, any
agreement or other arrangement providing for the furnishing of services by, rental of real or personal property from, or otherwise requiring payments to, any such person or entity, without the consent
of at least a majority of the members of the Company's Board of Directors having no interest in such agreement or arrangement. 

         (ii)  The
affirmative vote of a majority of the members of the Board of Directors, which majority shall include the Preferred Directors, shall be required to
(i) establish or increase the compensation of executive officers of the Company or (ii) grant stock options or stock pursuant to the Plan to any executive officer of the Company. 

        4.10.    Qualified Small Business Stock.    The Company shall submit to the Internal Revenue Service any reports that
may be required under Section 1202(d)(1)(C) of the Code and the Regulations promulgated thereunder. In addition, within a commercially reasonable number of days after any Investor's written
request therefor, the Company shall deliver to such Investor a written statement indicating whether, in
the Company's good faith judgment after a reasonable investigation, such Investor's interest in the Company constitutes "qualified small business stock" as defined in Section 1202(c) of the
Code. 

        4.11.    Termination of Covenants.    The covenants of the Company contained in Sections 4.1 through 4.10 shall
terminate and be of no further force or effect upon the closing of a Qualifying Public Offering, as defined in the Company's Tenth Amended and Restated Certificate of Incorporation (as amended and/or
restated from time to time), in which all of the outstanding shares of the Company's preferred stock converts into Common Stock. 

        4.12.    Termination of Certain Covenants in Existing Agreements.    The Company and Investors representing at least
60% of the outstanding shares of Series A Preferred hereby confirm that Sections 5 and 9.2 of the Series A Purchase Agreement have been terminated and are of no force or effect.
The Company and Investors representing a majority of the outstanding shares of Series A-1 Preferred hereby confirm that Sections 5 and 9.2 of the
Series A-1 Purchase Agreement have been terminated and are of no force or effect. 

        5.    Confidentiality.    Each Investor agrees that, until two years following the earlier of (i) the date on
which such Investor no longer owns any Registrable Shares and (ii) the date on which such Investor is no longer a party to this Agreement he, she or it will keep confidential and will not
disclose or divulge for any purpose, other than such Investor's internal use or to monitor his, her or its investment in the Company, any confidential, proprietary or secret information which such
Investor may obtain from the Company pursuant to financial statements, reports and other materials submitted by the Company to such Investor pursuant to this Agreement, or pursuant to visitation,
inspection or Board observer rights granted hereunder or in the Ancillary Agreements, or otherwise obtains from the Company or on behalf of the Company unless such information is known, or until such
information becomes known, to the public (other than as a result of a breach of this Section 5 by such Investor); provided, however, that an Investor may disclose such information (i) to
his, her or its attorneys, accountants, consultants, and other professionals to the extent necessary to obtain their services in 

19

 

connection
with monitoring his, her or its investment in the Company, (ii) to any prospective purchaser of any Shares from such Investor as long as such prospective purchaser agrees in writing
to be bound by the provisions of this section, (iii) to any affiliate of such Investor or to a member, manager, partner, stockholder or subsidiary of such Investor, provided that such affiliate
agrees in writing to be bound by the provisions of this Section 5, or (iv) as may otherwise be required by law, provided that the Investor takes reasonable steps to minimize the extent
of any such required disclosure. Any such proprietary information shall not be used, or provided to others for use, for any purpose in competition with the Company's business. Breach of this
Section 5 by any partner, subsidiary or parent of an Investor will be deemed to be a breach by the Investor. 

        6.    Transfers of Rights.    

        (a)   This
Agreement, and the rights and obligations of each hereunder, may be assigned by an Investor, a Common Investor, Comerica, Heller, SVB or Gold Hill to (i) any
person or entity to which at least 500,000 Shares (subject to appropriate adjustment in the event of any stock dividend, stock split, combination or other similar recapitalization affecting such
shares) are transferred by such Investor, Common Investor, Comerica, Heller, SVB or Gold Hill (or 100% of the Shares originally purchased by such Investor, Common Investor, Comerica, Heller, SVB or
Gold Hill if less than 500,000 (subject to appropriate adjustment in the event of any stock dividend, stock split, combination or other similar recapitalization affecting such shares)) or
(ii) to any affiliates, partner, member, manager or stockholder of such Investor, Common Investor or of Comerica, Heller, SVB or Gold Hill, and such transferee shall be deemed an "Investor" or
"Common Investor", as applicable, for purposes of this Agreement; provided, that the transferee provides written notice of such assignment to the Company and agrees in writing to be bound hereby. 

        (b)   In
connection with any transfer of Registrable Shares owned by a Founder permitted under the applicable Restricted Stock Agreement, dated as of December 17, 2001,
and made in compliance with the Sixth Amended and Restated Right of First Refusal and Co-Sale Agreement, of even date herewith, the rights and obligations of each Founder under
Section 2.2 hereunder may be assigned by such Founder to (i) any person or entity to which at least 500,000 Registrable Shares (subject to appropriate adjustment in the event of any
stock dividend, stock split, combination or other similar recapitalization affecting such shares) are transferred by such Founder (or 100% of the Registrable Shares held by such Founder if less than
500,000 (subject to appropriate adjustment in the event of any stock dividend, stock split, combination or other similar recapitalization affecting such shares)) or (ii) to his spouse or child
or a trust established for the benefit of his spouse, his child or himself, and such transferee shall be deemed a Founder for purposes of Section 2.2 of this Agreement; provided that the
transferee provides written notice of such assignment to the Company and agrees in writing to be bound hereby. 

        (c)   Each
Institutional Investor (as defined in Section 8(j) below) may assign this Agreement and its rights and obligations hereunder to any entity that may be
considered an affiliate (as defined in Rule 12b-2 promulgated under the Exchange Act) of such Institutional Investor and such affiliate of such Institutional Investor shall be
deemed an "Investor" for purposes of this Agreement, and all such affiliates of such Institutional Investor may from time to time reassign their rights to other affiliates of such Institutional
Investor; provided, in each case, that the transferee provides written notice of such assignment to the Company and agrees to be bound by the terms and conditions set forth herein. 

        7.    Amendment of and Waiver under the Old Investor Rights Agreement.    The Company and the holders at least
662/3% of the Registrable Shares held by the Investors (as defined in the Old Investor Rights Agreement) hereby (A) agree that, as of the date of this Agreement, (i) the
Old Investor Rights Agreement is hereby amended and restated in its entirety by this Agreement, and (ii) the provisions of 

20

 

the
Old Investor Rights Agreement shall no longer be of any force or effect and (B) waive their rights under Section 3.1 of the Old Investor Rights Agreement with respect to the sale of
shares of Series F Preferred. 

        8.    General.    

        (a)    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. 

        (b)    Specific Performance.    In addition to any and all other remedies that may be available at law in the event of
any breach of this Agreement, each Investor shall be entitled to specific performance of the agreements and obligations of the Company hereunder and to such other injunctive or other equitable relief
as may be granted by a court of competent jurisdiction. 

        (c)    Governing Law.    This Agreement shall be governed by and construed in accordance with the internal laws of
State of Delaware (without reference to the conflicts of law provisions thereof). 

        (d)    Notices.    All notices, requests, consents, and other communications under this Agreement shall be in writing
and shall be deemed delivered (i) two business days after being sent by registered or certified mail, return receipt requested, postage prepaid or (ii) one business day after being sent
via a reputable nationwide overnight courier service guaranteeing next business day delivery, in each case to the intended recipient as set forth below: 

        If
to the Company, at Arsenal on the Charles, 321 Arsenal Street, Watertown, MA 02472 or at such other address or addresses as may have been furnished in writing by the Company to the
Stockholders, with a copy to John H. Chory, Esq., Wilmer Cutler Pickering Hale and Dorr LLP, 1100 Winter Street, Suite 4650, Waltham, MA 02451; or 

        If
to a Founder, at his address set forth on the signature page hereto, or at such other address or addresses as may have been furnished to the Company and the other Stockholders in
writing by such Founder; or 

        If
to M.I.T., at its address set forth on the signature page hereto, or at such other address or addresses as may have been furnished to the Company and the other Stockholders in writing
by M.I.T.; or 

        If
to an Investor, at his or its address set forth on the signature page hereto for such Investor, or at such other address or addresses as may have been furnished to the Company in
writing by such Investor; or 

        If
to a Common Investor, at his or its address set forth on the signature page hereto for such Common Investor, or at such other address or addresses as may have been furnished to the
Company in writing by such Common Investor; or 

        If
to Comerica, at 100 Federal Street, 28th Floor, Boston, MA 02110, Attention: Bill Sweeney & Jim Demoy; or 

        If
to Heller, at c/o GE Equity, 201 Merritt 7, P.O. Box 5201, Norwalk, CT 06856-5281, Attention: Michael Donnelly; or 

        If
to SVB, at 3003 Tasman Drive, HA 200, Santa Clara, CA, Attention: Treasury Department; or 

        If
to Gold Hill, at One Newton Executive Park, Suite 100, 2221 Washington Street, Newton, MA 02462. 

21

 

        Any
party may give any notice, request, consent or other communication under this Agreement using any other means (including, without limitation, personal delivery, messenger service,
telecopy, first class mail or electronic mail), but no such notice, request, consent or other communication shall be deemed to have been duly given unless and until it is actually received by the
party for whom it is intended. Any party may change the address to which notices, requests, consents or other communications hereunder are to be delivered by giving the other parties notice in the
manner set forth in this Section. 

        (e)    Complete Agreement.    This Agreement, together with the (1) Series F Purchase Agreement and each
of the Exhibits thereto, (2) the Common Stock Subscription Agreements, constitute the entire agreement and understanding of the parties hereto with respect to the subject matter hereof and
thereof and supersede all prior agreements and understandings relating to such subject matter, including, but not limited to, Section 4.1(f)(ii) of the License Agreement. 

        (f)    Amendments and Waivers.    Any term of this Agreement may be amended or terminated and the observance of any
term of this Agreement may be waived (either generally or in a particular instance and either retroactively or prospectively), with the written consent of the Company and the holders of at least
662/3% of the Registrable Shares held by all of the Investors; provided that (i) any amendment, termination or waiver of any term of Section 2.2 of this Agreement which
has a disproportionately negative effect on the Founders and M.I.T. shall also require the written consent of the holders of at least a majority of the Registrable Shares collectively owned by the
Founders and M.I.T., (ii) subject to clause (iii) this Agreement may be amended with the consent of the holders of less than all Registrable Shares only in a manner which affects all
such holders in substantially the same fashion (it being agreed that a waiver of the provisions of Section 3 with respect to a particular transaction shall be deemed to apply to all Investors
in the same fashion if such waiver does so by its terms, notwithstanding the fact that certain Investors may nonetheless, by agreement with the Company, purchase securities in such transaction) and
(iii) notwithstanding anything in clause (ii) to the contrary, the provisions of Section 3 may not be waived or amended with respect to GE Capital CFE, Inc. without the
express written consent of GE Capital CFE, Inc. unless the effect of such waiver or amendment is merely to reduce the Basic Amount of GE Capital CFE, Inc. in connection with the addition
of new parties to this Agreement. Any such amendment, termination or waiver effected in accordance with this Section 8(f) shall be binding on all parties hereto, even if they do not execute
such consent. No waivers of or exceptions to any term, condition or provision of this Agreement, in any one or more instances, shall be deemed to be, or construed as, a further or continuing waiver of
any such term, condition or provision. 

        (g)    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. 

        (h)    Counterparts; Facsimile Signatures.    This Agreement may be executed in any number of counterparts, each of
which shall be deemed to be an original, and all of which together shall constitute one and the same document. This Agreement may be executed by facsimile signatures. 

        (i)    Section Headings.    The section headings are for the convenience of the parties and in no way alter, modify,
amend, limit or restrict the contractual obligations of the parties. 

        (j)    One Holder.    For purposes of determining the number of Shares held by each Investor under this Agreement,
(i) North Bridge Venture Partners IV-A, L.P., North Bridge Venture Partners IV-B, L.P., North Bridge Venture Partners V-A, L.P., and
North Bridge Venture Partners V-B, L.P. and all affiliates of North Bridge Venture Partners IV-A, L.P., North Bridge Venture Partners
IV-B, L.P., North Bridge Venture Partners V-A, L.P., and North Bridge Venture Partners V-B, L.P. (collectively, "North Bridge") shall be deemed
to be one holder, (ii) all affiliates of 

22

 

Gururaj
Deshpande ("Sparta") shall be deemed to be one holder, (iii) all affiliates of Sequoia Capital X, Sequoia Technology Partners X, and Sequoia Capital X Principals Fund ("Sequoia") shall
be deemed to be one holder, (iv) all affiliates of QUALCOMM Incorporated ("QUALCOMM") shall be deemed to be one holder, (v) all affiliates of Masthead Ventures ("Masthead") shall be
deemed to be one holder, (vi) all affiliates of YankeeTek Incubator Fund, LP, YankeeTek Affiliate Fund, LP, and YankeeTek Investment Partners, LLC ("YankeeTek") shall be
deemed to be one holder, (vii) all affiliates of Alliance Capital Management Corporation ("Alliance") shall be deemed to be one holder, (viii) all affiliates of Morgan Stanley Emerging
Markets Inc. ("Morgan Stanley") shall be deemed to be one holder, (ix) all affiliates of Anchorage Capital Master Offshore, Ltd. ("Anchorage") shall be deemed to be one holder,
(x) all affiliates of Israel Corporation Ltd. ("Israel Corporation") shall be deemed to be one holder and (xi) all affiliates of GE (GE, together with YankeeTek, North Bridge,
Sparta, Sequoia, QUALCOMM, Masthead, Alliance, Morgan Stanley, Anchorage and Israel Corporation, the "Institutional Investors" and each an "Institutional Investor") shall be deemed to be one holder. 

        (k)    Additional Purchasers.    Persons or entities that, after the date hereof, purchase Shares pursuant to the
Series F Purchase Agreement and become "Additional Purchasers" thereunder shall (without the need for approval by any other party to this Agreement), become parties to this Agreement by
executing and delivering a counterpart signature page hereto, whereupon they shall be deemed "Series F Purchasers" and "Investors" for all purposes of this Agreement. 

[Remainder
of page is intentionally left blank] 

23

 
        The parties have executed this Seventh Amended and Restated Investor Rights Agreement as of the date first written above. 

					
	 	 	 A123 SYSTEMS, INC.
	

 	
 	
By:	
 	
/s/ David Vieau

  David Vieau

President and Chief Executive Officer
	 	 	Address:	 	Arsenal on the Charles

One Kingsbury Avenue

Watertown, MA 02472
	 	 	Fax:	 	(617) 778-5749
	

 	
 	
 INVESTORS:
	

 	
 	
GE CAPITAL CFE, INC.
	

 	
 	
By:	
 	
/s/ Michael J. Donnelly

 
	 	 	Name:	 	Michael J. Donnelly
	 	 	Title:	 	Managing Director, GE Equity
	 	 	Address:	 	 
	 	 	Fax:	 	 
	

 	
 	
GE CAPITAL EQUITY INVESTMENTS, INC.
	

 	
 	
By:	
 	
/s/ Michal J. Donnelly

 
	 	 	Name:	 	Michael J. Donnelly
	 	 	Title:	 	Managing Director, GE Equity
	 	 	Address:	 	 
	 	 	Fax:	 	 
	

 	
 	
NORTH BRIDGE VENTURE PARTNERS IV-A, L.P.
	

 	
 	
By: North Bridge Venture Management IV, L.P.,

Its General Partner
	

 	
 	
By: NBVM GP, LLC

Its General Partner
	

 	
 	
By:	
 	
/s/ Jeffrey P. McCarthy

 
	 	 	Name:	 	Jeffrey P. McCarthy
	 	 	Title:	 	Manager
	 	 	Address:	 	950 Winter Street, Suite 4600

Waltham, MA 02451
	 	 	Fax:	 	(781) 290-0999

					
	

 	
 	
NORTH BRIDGE VENTURE PARTNERS IV-B, L.P.
	

 	
 	
By: North Bridge Venture Management IV, L.P.,

Its General Partner
	

 	
 	
By: NBVM GP, LLC

Its General Partner
	

 	
 	
By:	
 	
/s/ Jeffrey P. McCarthy

 
	 	 	Name:	 	Jeffrey P. McCarthy
	 	 	Title:	 	Manager
	 	 	Address:	 	950 Winter Street, Suite 4600

Waltham, MA 02451
	 	 	Fax:	 	(781) 290-0999
	

 	
 	
NORTH BRIDGE VENTURE PARTNERS V-A, L.P.
	

 	
 	
By: North Bridge Venture Management IV, L.P.,

Its General Partner
	

 	
 	
By: NBVM GP, LLC

Its General Partner
	

 	
 	
By:	
 	
/s/ Jeffrey P. McCarthy

 
	 	 	Name:	 	Jeffrey P. McCarthy
	 	 	Title:	 	Manager
	 	 	Address:	 	950 Winter Street, Suite 4600

Waltham, MA 02451
	 	 	Fax:	 	(781) 290-0999
	

 	
 	
NORTH BRIDGE VENTURE PARTNERS V-B, L.P.
	

 	
 	
By: North Bridge Venture Management IV, L.P.,

Its General Partner
	

 	
 	
By: NBVM GP, LLC

Its General Partner
	

 	
 	
By:	
 	
/s/ Jeffrey P. McCarthy

 
	 	 	Name:	 	Jeffrey P. McCarthy
	 	 	Title:	 	Manager
	 	 	Address:	 	950 Winter Street, Suite 4600

Waltham, MA 02451
	 	 	Fax:	 	(781) 290-0999
	

 	
 	
 	
 	
/s/ Gururaj Deshpande

 
	 	 	 	 	Gururaj Deshpande
	 	 	Address:	 	 
	 	 	Fax:	 	 

					
	

 	
 	
UNICORN TRUST IV
	

 	
 	
By:	
 	
/s/ Gururaj Deshpande

 
	 	 	Name:	 	Gururaj Deshpande
	 	 	Title:	 	 
	

 	
 	
UNICORN TRUST VI
	

 	
 	
By:	
 	
/s/ Gururaj Deshpande

 
	 	 	Name:	 	Gururaj Deshpande
	 	 	Title:	 	Trustee
	

 	
 	
UNICORN TRUST VIII
	

 	
 	
By:	
 	

 
	 	 	Name:	 	Gururaj Deshpande
	 	 	Title:	 	Trustee
	

 	
 	
 	
 	
/s/ Paresh Patel

 
	 	 	 	 	Paresh Patel
	 	 	Address:	 	Sandstone Capital

177 Milk Street

Boston, MA 02109
	 	 	Fax:	 	(617) 938-6410
	

 	
 	
 SEQUOIA CAPITAL X

SEQUOIA TECHNOLOGY PARTNERS X

SEQUOIA CAPITAL X PRINCIPALS FUND
	

 	
 	
By: SC X MANAGEMENT, L.L.C.

A Delaware Limited Liability Company

General Partner of Each
	

 	
 	
By:	
 	
/s/ Michael Moritz

  Managing Member
	 	 	Address:	 	3000 Sand Hill Road, 4-180

Menlo Park, CA 94025
	 	 	Fax:	 	(650) 854-2977
	

 	
 	
MASTHEAD FRIENDSHIP, LLC
	

 	
 	
By: Masthead Venture Partners, LLC,

Manager Member
	

 	
 	
By:	
 	
/s/ Braden M. Bohrmann

 
	 	 	Name:	 	Braden M. Bohrmann
	 	 	Title:	 	Manager
	 	 	Address:	 	3 Canal Plaza, Suite 600

Portland, ME 04101
	 	 	Fax:	 	(207) 780-0913

 

					
	

 	
 	
MASTHEAD CONCORDIA, LLC
	

 	
 	
By: Masthead Venture Partners, LLC,

Manager Member
	

 	
 	
By:	
 	
/s/ Braden M. Bohrmann

 
	 	 	Name:	 	Braden M. Bohrmann
	 	 	Title:	 	Manager
	 	 	Address:	 	3 Canal Plaza, Suite 600

Portland, ME 04101
	 	 	Fax:	 	(207) 780-0913
	

 	
 	
MASTHEAD TIDELINE LLC
	

 	
 	
By: Masthead Venture Partners, LLC,

Manager Member
	

 	
 	
By:	
 	
/s/ Braden M. Bohrmann

 
	 	 	Name:	 	Braden M. Bohrmann
	 	 	Title:	 	Manager
	 	 	Address:	 	3 Canal Plaza, Suite 600

Portland, ME 04101
	 	 	Fax:	 	(207) 780-0913
	

 	
 	
MVP GLOBAL, LLC
	

 	
 	
By: Masthead Venture Partners, LLC,

Manager Member
	

 	
 	
By:	
 	
/s/ Braden M. Bohrmann

 
	 	 	Name:	 	Braden M. Bohrmann
	 	 	Title:	 	Manager
	 	 	Address:	 	3 Canal Plaza, Suite 600

Portland, ME 04101
	 	 	Fax:	 	(207) 780-0913
	

 	
 	
MASTHEAD ENDEAVOUR, LLC
	

 	
 	
By: Masthead Venture Partners, LLC,

Manager Member
	

 	
 	
By:	
 	
/s/ Braden M. Bohrmann

 
	 	 	Name:	 	Braden M. Bohrmann
	 	 	Title:	 	Manager
	 	 	Address:	 	3 Canal Plaza, Suite 600

Portland, ME 04101
	 	 	Fax:	 	(207) 780-0913

					
	

 	
 	
TRUSTEES OF BOSTON UNIVERSITY
	

 	
 	
By:	
 	
/s/ Pamela Peedin

 
	 	 	Name:	 	Pamela Peedin
	 	 	Title:	 	Chief Investment Officer
	 	 	Address:	 	 
	 	 	Fax:	 	 
	

 	
 	
ONPOINT TECHNOLOGIES, INC.
	

 	
 	
By:	
 	
/s/ John Trbovich

 
	 	 	Name:	 	John Trbovich
	 	 	Title:	 	General Partner

Milcomventure Partners
	

 	
 	
QUALCOMM INCORPORATED
	

 	
 	
By:	
 	
/s/ Nagraj Kashyap

 
	 	 	Name:	 	Nagraj Kashyap
	 	 	Title:	 	Vice President, Ventures
	 	 	Address:	 	5775 Morehouse Drive

San Diego, CA 92121

Attention: General Counsel
	 	 	Fax:	 	(858) 845-1249
	

 	
 	
MOTOROLA, INC.
	

 	
 	
By:	
 	
/s/ Reese Schroeder

 
	 	 	Name:	 	Reese Schroeder
	 	 	Title:	 	Managing Director, Motorola Ventures
	 	 	Address:	 	1303 E. Algonquin Road

Schaumburg, IL 60196

Attention: Director of Motorola Ventures

With a Copy to: General Counsel
	 	 	Fax:	 	(847) 576-2569
	

 	
 	
YANKEETEK INCUBATOR FUND, L.P.
	

 	
 	
By: YankeeTek Partners, L.P.,

its General Partner
	

 	
 	
By: YTI, LLC, its General Partner
	

 	
 	
By:	
 	

 
	 	 	Name:	 	Howard Anderson

Managing Member
	 	 	Address:	 	One Memorial Drive

Cambridge, MA 02142
	 	 	Fax:	 	 

					
	

 	
 	
YANKEETEK AFFILIATE FUND, LP
	

 	
 	
By: YankeeTek Partners, L.P.,

its General Partner
	

 	
 	
By: YTI, LLC, its General Partner
	

 	
 	
By:	
 	

 
	 	 	Name:	 	Howard Anderson

Managing Member
	 	 	Address:	 	One Memorial Drive

Cambridge, MA 02142
	 	 	Fax:	 	 
	

 	
 	
YANKEETEK INVESTMENT PARTNERS, LLC
	

 	
 	
By:	
 	

 
	 	 	Name:	 	Howard Anderson

Managing Member
	 	 	Address:	 	One Memorial Drive

Cambridge, MA 02142
	 	 	Fax:	 	 
	 	 	MASSACHUSETTS INSTITUTE OF TECHNOLOGY
	

 	
 	
By:	
 	
/s/ Seth D. Alexander

 
	 	 	Name:	 	Seth D. Alexander
	 	 	Title:	 	President

MIT Investment Management Company
	 	 	Address:	 	238 Main Street, Suite 200

Cambridge, MA 02142
	 	 	Fax:	 	(617)258-6676
	

 	
 	
 ALLIANCE BERNSTEIN VENTURE FUND I, L.P.
	

 	
 	
 By: Alliance Bernstein ESG Venture

Management, L.P., its general partner
	

 	
 	
 By: Alliance Bernstein Global Derivatives

Corporation, its general partner,
	

 	
 	
By:	
 	
/s/ Amy Raskin

 
	 	 	Name:	 	Amy Raskin
	 	 	Title:	 	Senior Vice President
	 	 	Address:	 	1345 Avenue of the Americas

New York, NY 10105
	 	 	Fax:	 	 
	

 	
 	
With a copy to:	
 	

 
	 	 	 	 	Fadi G. Samman, Esq.

Akin Gump Strauss Hauer & Feld LLP

1333 New Hampshire Ave. NW

Washington, DC 20036

 

					
	

 	
 	
 FA TECHNOLOGY VENTURES, L.P.
	

 	
 	
 By:	
 	

 
	 	 	 	 	

  Kenneth A. Mabbs, Manager
	

 	
 	
 FA TECHNOLOGY MANAGERS, LLC
	

 	
 	
 By:	
 	

 
	 	 	Name:	 	Kenneth A. Mabbs
	 	 	Title:	 	Manager
	

 	
 	
 FIRST ALBANY PRIVATE FUND 2004, LLC
	

 	
 	
 By:	
 	

 
	 	 	Name:	 	Kenneth A. Mabbs
	 	 	Title:	 	Manager
	

 	
 	
 GOLD HILL VENTURE LENDING 03, L.P.
	

 	
 	
 By: GOLD HILL VENTURE LENDING

PARTNERS, LLC, its General Partner
	

 	
 	
 By:	
 	
/s/ Tim McDonough

 
	 	 	Name:	 	Tim McDonough
	 	 	Title:	 	Principal, Gold Hill Capital
	 	 	Address:	 	Two Newton Executive Park, Suite 203

Newton, Massachusetts 02462
	 	 	Fax:	 	(617) 243-2601
	

 	
 	
 THE PROCTER & GAMBLE COMPANY
	

 	
 	
 By:	
 	
/s/ Mark S. Bertolami

 
	 	 	Name:	 	Mark S. Bertolami
	 	 	Title:	 	President, Duracell
	

 	
 	
 MORGAN STANLEY EMERGING MARKETS INC.
	

 	
 	
 By:	
 	
/s/ Donna M. Souza

 
	 	 	Name:	 	Donna M. Souza
	 	 	Title:	 	Vice President
	 	 	Address:	 	1585 Broadway, 2nd Floor

New York, NY 10036
	 	 	Attention:	 	Ju-Lie Bell
	 	 	Fax:	 	(646) 452-4320
	

 	
 	
 and
	

 	
 	

 	
 	
 1221 Avenue of the Americas, 30th floor

New York, NY 10020
	 	 	Attention:	 	Melissa Schramm
	 	 	Fax:	 	(212) 507-1929

					
	

 	
 	
 with a copy to:
	

 	
 	

 	
 	
 Richards Kibbe & Orbe, LLP

One World Financial Center

New York, NY 10281
	 	 	Attention:	 	Jahan Sharifi, Esq.
	 	 	Fax:	 	(212) 530-1801
	

 	
 	
 ANCHORAGE CAPITAL MASTER OFFSHORE, LTD.
	

 	
 	
 By: Anchorage Advisors, L.L.C.

its investment manager
	

 	
 	
 By:	
 	
/s/ Kevin Ulrich

 
	 	 	Name:	 	Kevin Ulrich
	 	 	Title:	 	CEO
	 	 	Address:	 	610 Broadway, 6th floor

New York, NY 10012
	 	 	Attention:	 	General Counsel
	 	 	Fax:	 	(212) 432 4601
	

 	
 	
 THE MICHAEL J. EGAN 1996 GIFT TRUST A
	

 	
 	
 By:	
 	

 
	 	 	Name:	 	 
	 	 	Title:	 	 
	 	 	Address:	 	 
	 	 	Fax:	 	 
	

 	
 	
 LEGACY PRIVATE TECHNOLOGY PARTNERS II, LTD.
	

 	
 	
 By:	
 	

 
	 	 	Name:	 	 
	 	 	Title:	 	 
	 	 	Address:	 	 
	 	 	Fax:	 	 

 

					
	 	 	CMEA VENTURES VII, L.P.

CMEA VENTURES VII (PARALLEL), L.P.
	

 	
 	
By:	
 	
CMEA Ventures VII GP, L.P., its general partner
	 	 	By:	 	CMEA Ventures VII GP, LLC, its generalpartner
	

 	
 	
By:	
 	
/s/ Faysal Sohail

 
	 	 	Name:	 	Faysal Sohail
	 	 	Title:	 	Managing Director
	 	 	Address:	 	1 Embarcadero Center, Suite 3250

San Francisco, CA 94111
	 	 	Fax:	 	(415) 352-1524
	
 	
 	
OPEN FIELD PRIVATE PARTNERS LLC
	
 	
 	
By:	
 	
/s/ Marc Weiss

 
	 	 	Name:	 	Marc Weiss
	 	 	Title:	 	CIO
	 	 	Address:	 	1114 Avenue of the Americas, 38th Fl.

New York, NY 10036
	 	 	Fax:	 	(212) 656-1396
	

 	
 	
ANTAR & COMPANY
	

 	
 	
By:	
 	
/s/ Steve Spengnether

 
	 	 	Name:	 	Steve Spengnether
	 	 	Title:	 	Partner
	 	 	Address:	 	1114 Avenue of the Americas, 38th Floor

New York, NY 10036
	 	 	Fax:	 	 
	

 	
 	
ISRAEL CORPORATION
	

 	
 	
By:	
 	
/s/ Nir Gilad

 
	 	 	Name:	 	Nir Gilad
	 	 	Title:	 	President & Chief Executive Officer
	 	 	Address:	 	Millennium Tower

23 Aranha Street

P.O. Box 20456

Tel Aviv 61204 Israel
	 	 	Fax:	 	972-3-684-4570

					
	

 	
 	
 CONOCOPHILLIPS COMPANY
	

 	
 	
By:	
 	
/s/ Frances M. Vallejo

 
	 	 	Name:	 	Frances M. Vallejo
	 	 	Title:	 	Vice President and Treasurer
	

 	
 	
DTE ENERGY VENTURES, INC.
	

 	
 	
By:	
 	
/s/ Knut Simonsen

 
	 	 	Name:	 	Knut Simonsen
	 	 	Title:	 	President
	

 	
 	
NOVUS A123 INVESTMENTS LLC
	

 	
 	
By:	
 	
/s/ Mark Huang

 
	 	 	Name:	 	Mark Huang
	 	 	Title:	 	Partner
	 	 	Address:	 	201 N. Union Street

Suite 350

Alexandria, VA 22314
	

 	
 	
 	
 	
/s/ Stephen Lehner

 
	 	 	 	 	Stephen Lehner
	 	 	Address:	 	 
	

 	
 	
ESPIRITO SANTO VENTURES SCR SA, as nominee

for an affiliated fund under formation
	

 	
 	
By:	
 	
/s/ J. Servuco Rodrigues

 
	 	 	Name:	 	J. Servuco Rodrigues
	 	 	Title:	 	Chief Executive Officer
	

 	
 	
By:	
 	
/s/ João Apendre

 
	 	 	Name:	 	João Apendre
	 	 	Title:	 	Chief Financial Officer
	 	 	Address:	 	Praça Marquês de Pombal, 3A, 4

1250-161 Lisboa—Portugal
	 	 	Attention:	 	Joaquim Servulo Rodrigues

João Paulo Apendre
	

 	
 	
with a copy to:
	

 	
 	
 	
 	
McCarter & English, LLP

245 Park Avenue, 27th Floor

New York, NY 10167

Attention: Howard Berkower, Esq.
	 	 	Fax:	 	(212) 999-6891

					
	

 	
 	
IHI CORPORATION
	

 	
 	
By:	
 	
/s/ Yutaka Yoshida

 
	 	 	Name:	 	Yutaka Yoshida
	 	 	Title:	 	Executive Officer, General Manger of Corporate Planning Division
	 	 	Address:	 	Toyosu IHI Building 1-1,

Toyosu 3-chome, Koto-ku

Tokyo 135-8710 Japan
	 	 	Fax:	 	 
	

 	
 	
123 INVESTOR LLC
	

 	
 	
By:	
 	
/s/ Stuart Freedman

 
	 	 	Name:	 	Stuart Freedman
	 	 	Title:	 	Authorized Signatory
	 	 	Address:	 	623 5th Avenue, 18th Floor

New York, NY 10022
	 	 	Fax:	 	(212) 588-6180
	

 	
 	
BRAEMAR ENERGY VENTURES II, LP
	

 	
 	
By:	
 	
/s/ Neil Suslak

 
	 	 	Name:	 	Neil Suslak
	 	 	Title:	 	Managing Director
	 	 	Address:	 	340 Madison Avenue, 18th Floor

New York, NY 10173
	 	 	Fax:	 	 

 

					
	 	 	 COMMON INVESTORS:
	

 	
 	
GPSF SECURITIES INC.
	

 	
 	
By:	
 	

 
	 	 	Name:	 	 
	 	 	Title:	 	 
	

 	
 	
 NOVUS A123 INVESTMENTS LLC
	

 	
 	
By:	
 	
/s/ Mark Huang

 
	 	 	Name:	 	Mark Huang
	 	 	Title:	 	Partner
	

 	
 	
 FOUNDERS:
	

 	
 	
 	
 	

 
	 	 	 	 	Ricardo Fulop
	

 	
 	
Address:	
 	
1169 Commonwealth Ave.

Boston, MA 02134
	

 	
 	
 	
 	

 
	 	 	 	 	Gilbert Neal Riley, Jr.
	 	 	Address:	 	 
	

 	
 	
 	
 	

 
	 	 	 	 	Yet-Ming Chiang
	

 	
 	
Address:	
 	
52 Lake Road

Framingham, MA 01701
	

 	
 	
YET-MING CHIANG GRANTOR RETAINED

ANNUITY TRUST-2008
	

 	

 	

 By:	

 	

 

 
	 	 	Name:	 	 
	 	 	Title	 	 
	

 	
 	
 COMERICA BANK
	

 	
 	
By:	
 	

 
	 	 	Name:	 	 
	 	 	Title:	 	 
	 	 	Address:	 	 
	

 	
 	
Fax:	
 	

 

					
	

 	
 	
HELLER:
	

 	
 	
HELLER FINANCIAL LEASING
	

 	
 	
By:	
 	
/s/ Michael J. Donnelly

 
	 	 	Name:	 	Michael J. Donnelly
	 	 	Title:	 	Managing Partner, GE Equity
	 	 	Address:	 	500 West Monroe
	 	 	 	 	Chicago, IL 60661
	 	 	Fax:	 	 
	

 	
 	
 SVB:
	

 	
 	
 SILICON VALLEY BANK
	

 	
 	
By:	
 	

 
	 	 	Name:	 	 
	 	 	Title:	 	 
	 	 	Address:	 	3003 Tasman Drive

Santa Clara, CA 95054
	 	 	Fax:	 	(408) 496-2405
	

 	
 	
GOLD HILL:
	

 	
 	
GOLD HILL VENTURE LENDING 03, L.P.
	

 	
 	
By: Gold Hill Venture Lending Partners, LLC,

its General Partner
	

 	
 	
By:	
 	

 
	 	 	Name:	 	 
	 	 	Title:	 	 
	 	 	Address:	 	One Newton Executive Park

Suite 100

2221 Washington St.

Newton, MA 02462
	 	 	Fax:	 	(617) 527-0505

 
 

  EXHIBIT A    
    

 Series A Investors  

North
Bridge Venture Partners IV-A, L.P.

North Bridge Venture Partners IV-B, L.P.

North Bridge Venture Partners V-A, L.P.

North Bridge Venture Partners V-B, L.P.

Unicorn Trust IV

Gururaj Deshpande

Paresh Patel

Sequoia Capital X

Sequoia Technology Partners X

Sequoia Capital X Principals Fund

YankeeTek Incubator Fund, LP

YankeeTek Affiliate Fund, LP

YankeeTek Investment Partners, LLC

Massachusetts Institute of Technology 

 Series A-1 Investors  

YankeeTek
Incubator Fund, LP

YankeeTek Affiliate Fund, LP

YankeeTek Investment Partners, LLC

Qualcomm Incorporated

Motorola, Inc.

Masthead Friendship, LLC

Masthead Concordia, LLC

Masthead Tideline, LLC

MVP Global, LLC

Masthead Endeavor, LLC

Trustees of Boston University 

 Series B Investors  

Masthead
Friendship, LLC

Masthead Concordia, LLC

Masthead Tideline LLC

MVP Global, LLC

Masthead Endeavour, LLC

Trustees of Boston University

Massachusetts Institute of Technology

Motorola, Inc.

North Bridge Venture Partners IV-A, L.P.

North Bridge Venture Partners IV-B, L.P.

North Bridge Venture Partners V-A, L.P.

North Bridge Venture Partners V-B, L.P.

Gururaj Deshpande

Unicorn Trust IV

Unicorn Trust VI

Unicorn Trust VIII

Qualcomm Incorporated

Sequoia Capital X

Sequoia Technology Partners X

Sequoia Capital X Principals Fund

YankeeTek
Incubator Fund, LP

YankeeTek Affiliate Fund, LP

YankeeTek Investment Partners, LLC

OnPoint Technologies, Inc. 

 Series C Investors  

Masthead
Tideline LLC

MVP Global, LLC

Masthead Endeavour, LLC

Massachusetts Institute of Technology

Motorola, Inc.

North Bridge Venture Partners IV-A, L.P.

North Bridge Venture Partners IV-B, L.P.

North Bridge Venture Partners V-A, L.P.

North Bridge Venture Partners V-B, L.P.

Qualcomm Incorporated

Sequoia Capital X

Sequoia Technology Partners X

Sequoia Capital X Principals Fund

YankeeTek Incubator Fund, LP

OnPoint Technologies, Inc.

AllianceBernstein Venture Fund I, L.P.

GE Capital CFE, Inc.

FA Technology Ventures, L.P.

FA Technology Managers, LLC

First Albany Private Fund 2004, LLC

Trustees of Boston University

Gold Hill Venture Lending 03, L.P.

Unicorn Trust VI

Morgan Stanley Emerging Markets Inc. 

 Series D Investors  

Masthead
Tideline LLC

MVP Global, LLC

Masthead Endeavour, LLC

Masthead Friendship, LLC

Massachusetts Institute of Technology

North Bridge Venture Partners IV-A, L.P.

North Bridge Venture Partners IV-B, L.P.

North Bridge Venture Partners V-A, L.P.

North Bridge Venture Partners V-B, L.P.

Unicorn Trust VI

Unicorn Trust VIII

Unicorn Trust X

Sequoia Capital X

Sequoia Technology Partners X

Sequoia Capital X Principals Fund

OnPoint Technologies, Inc.

AllianceBernstein Venture Fund I, L.P.

GE Capital Equity Investments, Inc.

FA Technology Ventures, L.P.

FA Technology Managers, LLC

First
Albany Private Fund 2004, LLC

Gold Hill Venture Lending 03, L.P.

The Procter & Gamble Company

Qualcomm Incorporated

The Michael J. Egan 1996 Gift Trust A

Legacy Private Technology Partners II, Ltd.

CMEA Ventures VII, L.P.

CMEA Ventures VII (Parallel), L.P.

Open Field Private Partners LLC

Motorola, Inc. 

 Series E Investors  

Morgan
Stanley Emerging Markets Inc.

Anchorage Capital Master Offshore, Ltd.

GE Capital Equity Investments, Inc.

Alliance Bernstein Venture Fund I, L.P.

OnPoint Technologies, Inc.

Masthead Friendship LLC

Masthead Tideline LLC

MVP Global, LLC

Masthead Endeavour, LLC

CMEA Ventures VII, L.P.

CMEA Ventures VII (Parallel), L.P.

Open Field Private Partners LLC

Legacy Private Technology Partners II, Ltd.

Antar & Company

Israel Corporation 

 Series F Purchasers  

GE
Capital Equity Investments, Inc.

North Bridge Venture Partners IV-A, L.P.

North Bridge Venture Partners IV-B, L.P.

North Bridge Venture Partners V-A, L.P.

North Bridge Venture Partners V-A, L.P.

Morgan Stanley Emerging Markets Inc.

CMEA Ventures VII, LP

CMEA Ventures VII (Parallel), LP

Alliance Bernstein Venture Fund I, L.P.

Unicorn Trust X

Sequoia Capital X

Sequoia Technology Partners X

Sequoia Capital X Principals Fund

Qualcomm Incorporated

Masthead Endeavour, LLC

Masthead Tideline, LLC

Massachusetts Institute of Technology

OnPoint Technologies, Inc.

Novus A123 Investments LLC

Stephen Lehner

DTE Energy Ventures, Inc.

ConocoPhillips Company

Espirito Santo Ventures SCR SA, as nominee for an affiliated fund under formation

Open
Field Private Partners LLC

Antar & Company

Israel Corporation

IHI Corporation

123 Investor LLC

Braemar Energy Ventures II, LP 

 Common Stock Purchasers  

GPSF
Securities Inc.

Novus A123 Investments LLC 

QuickLinks

Exhibit 10.15

A123 SYSTEMS, INC. SEVENTH AMENDED AND RESTATED INVESTOR RIGHTS AGREEMENT

Recitals

EXHIBIT A

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