Note Purchase Agreement



 Exhibit 4.8 
 NOTE PURCHASE AGREEMENT 
 THIS NOTE PURCHASE AGREEMENT (the “Agreement”)
is made as of February 9, 2004 by and among Exa Corporation (the “Company”), a Delaware corporation, Edelson Technology Partners (“Edelson”), Fidelity Ventures Limited and FMR Corporation (together “Fidelity”),
Boston Capital Ventures III, Limited Partnership (“BCV III”) and Boston Capital Ventures IV, Limited Partnership (“BCV IV” together with Edelson, Fidelity and BCV III, the “Investors”). The Company and the Investors
(each individually a “Party”) shall together be referred to herein as the “Parties.” 
 WHEREAS, the
Investors have loaned the Company an aggregate principal amount of $4,807,089.76 represented by a series of short term promissory notes executed by the Company as listed on Exhibit A attached hereto (which illustrates the amount of principal
and interest due under the respective notes); 
 WHEREAS, such short term notes were converted into demand promissory notes
dated and executed by the Company on April 28, 2003 (the “Bridge Notes”); 
 WHEREAS, the Company and the
Investors wish to convert the principal and a portion of the interest due under the Bridge Notes (except for BCV III and BCV IV who wish to convert only a portion of both the principal and interest due under the Bridge Notes) into five year notes
convertible into shares of Series H Convertible Preferred Stock, $.001 par value (“Series H Preferred Stock”), of the Company (the “Series H Notes”); and 
 WHEREAS, BCV III and BCV IV wish to convert a portion of the principal and interest due them under the Bridge Notes into five year promissory notes which shall be senior to the Series H Notes (the
“Non-Convertible Notes”); 
 NOW, THEREFORE, in consideration of the premises and the covenants set forth below, the
Parties hereby agree as follows: 
 1. Authorization and Conversion into Series H Notes 

1.1 Authorization of Series H Notes, Series H Preferred Stock and Non-Convertible Notes. Prior to the Closing (as
defined in Section 1.4), the Company shall have authorized the issuance of the Series H Notes and the issuance of up to 35,000,000 shares of its Series H Preferred Stock upon conversion of the Series H Notes (the “Note Shares”). The Series
H Notes shall have a term of five (5) years and bear an interest rate of ten percent (10%) compounded annually and at the election of the Investors, the Series H Notes shall be convertible into shares of Series H Preferred Stock of the
Company at a price of $.25 per share (or as adjusted pursuant to the terms of the Series H Notes). The Series H Notes shall be in the form of Convertible Promissory Note attached hereto as Exhibit B. Prior to the Closing, the Company shall
have also authorized the issuance of the Non-Convertible Notes. The Non-Convertible Notes shall be in the form of Non-Convertible Note attached hereto as Exhibit C. 







 1.2 Issuance of Series H Notes and Non-Convertible Notes. At the
Closing, the Company shall issue to the Investors, and the Investors shall acquire from the Company, upon the terms and conditions set forth herein, the Series H Notes issued in the principal amounts to each Investor set forth on Exhibit A.
At the Closing, the Company shall issue to BCV III and BCV IV, and BCV III and BCV IV shall acquire from the Company, upon the terms and conditions set forth herein, the Non-Convertible Notes issued in the principal amounts to each of BCV III and
BCV IV set forth on Exhibit A. 
 1.3 Surrender and Cancellation of Bridge Notes. The Investors
agree to at the Closing, surrender to the Company for cancellation the Bridge Notes listed on Exhibit A hereto. The Investors agree that upon execution of this Agreement, the Bridge Notes shall be cancelled with no further act or deed
simultaneously with the issuance of the Series H Notes. 
 1.4 Closing. The closing with respect to the
transactions contemplated hereby (the “Closing”) shall take place at the offices of Foley Hoag LLP, 155 Seaport Boulevard, Boston, MA 02210 (Fax: (617) 832-7000; Tel: (617) 832-1000) on the date hereof, or at such other location
as the Parties shall agree upon. On the date of the Closing, the Company shall issue and deliver to the Investors the executed Series H Notes and executed Non-Convertible Notes listed on Exhibit A attached hereto and the Investors shall
surrender for cancellation the Bridge Notes listed on Exhibit A attached hereto. The rights of the Investors with respect to the Non-Convertible Notes and the Series H Notes shall be as set forth in the Non-Convertible Notes and the Series H
Notes, respectively, and this Agreement. 
 2. Representations and Warranties of the Company. 

In order to induce the Investors to enter into this Agreement and to purchase the Series H Notes, the Company hereby represents and
warrants to the Investors that: 
 2.1 Organization and Corporate Power. Except as set forth on Schedule
2.1, the Company is a corporation duly organized, validly existing and in good standing under the laws of the State of Delaware and is qualified to do business as a foreign corporation in each jurisdiction where such qualification is required and in
which failure to so qualify would have a material adverse effect on the Company. The Company has all required corporate power and authority to own its property, to carry on its business as presently conducted or contemplated to be conducted and to
carry out the transactions contemplated hereby. The copies of the Certificate of Incorporation and By-laws of the Company, as amended to date, which have been furnished to the Investors by the Company, are correct and complete. 

2.2 Authorization. This Agreement, the Series H Notes, the Non-Convertible Notes, the Right of First Refusal and
Co-Sale Rights Agreement (as defined in Section 4.9) and the Amendment and Waiver which amends all previous Preferred Stock purchase agreements (the “Amendment and Waiver”) and any other agreements, instruments, or documents entered into
by the Company pursuant to this Agreement, the Series H Notes, the Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement or the Amendment and Waiver have been duly executed and delivered by the Company and are the legal,
valid and, assuming due execution by the other parties hereto and thereto, binding obligations of the Company, enforceable in accordance with their terms subject to applicable bankruptcy, fraudulent conveyance, insolvency, reorganization, moratorium
and similar laws affecting creditors’ rights generally and by general equitable principles. The execution, delivery and performance of this Agreement, the Series H Notes, the Non-Convertible Notes, the Right of First Refusal and


  
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Co-Sale Rights Agreement and the Amendment and Waiver and any other agreement, instrument or document entered into by the Company pursuant to this Agreement, the Series H Notes, the
Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement or the Amendment and Waiver have been duly authorized by all necessary corporate action of the Company. 

2.3 Capitalization. The entire authorized capital stock of the Company consists of 87,000,000 shares of Common
Stock, $.001 par value, of which 2,071,001 shares are issued and outstanding, and 73,735,000 shares of Preferred Stock, $.001 par value, of which 2,500,000 have been designated Series A Convertible Preferred Stock (“Series A Preferred
Stock”), of which 2,421,661 are issued and outstanding, 4,100,000 of which have been designated Series B Convertible Preferred Stock (“Series B Preferred Stock”), of which 4,063,694 are issued and outstanding, 4,000,000 of which have
been designated Series C Convertible Preferred Stock (“Series C Preferred Stock”), of which 3,547,981 are issued and outstanding, 475,000 of which have been designated Series D Convertible Preferred Stock (“Series D Preferred
Stock”), of which none are issued and outstanding, 1,000,000 of which have been designated Series E Convertible Preferred Stock (“Series E Preferred Stock”), of which 1,000,000 are issued and outstanding, 1,660,000 of which have been
designated Series F Convertible Preferred Stock (“Series F Preferred Stock”), of which 652,174 are issued and outstanding, 25,000,000 of which have been designated Series G Preferred Stock, of which 4,845,839 are issued and outstanding and
35,000,000 of which have been designated Series H Preferred Stock, of which none are issued and outstanding. The shares of Common Stock, Series A Preferred Stock, Series B Preferred Stock, Series C Preferred Stock, Series E Preferred Stock, Series F
Preferred Stock and Series G Preferred Stock outstanding have been duly authorized and are validly issued, fully paid and nonassessable. A complete list of all holders of Common Stock, Series A Preferred Stock, Series B Preferred Stock, Series C
Preferred Stock, Series E Preferred Stock, Series F Preferred Stock, Series G Preferred Stock and the number of such shares held by each such holder is attached hereto as Schedule 2.3. The Company holds 211,240 shares of Common Stock and no shares
of Preferred Stock in its treasury. When issued in accordance with the terms of this Agreement the Series H Notes and the Note Shares issuable upon conversion thereof, will be duly authorized, validly issued and outstanding, fully paid and
nonassessable. The Company has authorized and reserved for issuance upon conversion of the Series H Notes a sufficient number of Note Shares, and the Note Shares will, upon such issuance in accordance with the terms of the Company’s Certificate
of Incorporation be duly authorized, validly issued and outstanding, fully paid and nonassessable. The Company has authorized and reserved for issuance upon conversion of the Series H Preferred Stock (the “Conversion Shares”) a sufficient
number of shares of its Common Stock, and the Conversion Shares will, upon such issuance in accordance with the terms of the Company’s Certificate of Incorporation be duly authorized, validly issued and outstanding, fully paid and
nonassessable. Except as set forth in Schedule 2.3A, there are no outstanding warrants, options or other rights to purchase or acquire from the Company, or exchangeable for or convertible into, any shares of capital stock of the Company. Except as
provided herein or as set forth in Schedule 2.3A attached hereto, there are no preemptive rights with respect to the issuance or sale by the Company of the Series H Notes, the Note Shares upon conversion thereof or the Conversion Shares. Except as
set forth in Schedule 2.3A or as provided in the Second Restated Stockholders Agreement dated September 30, 1996 between the Company and certain of its shareholders and the Right of First Refusal and Co-Sale Rights Agreement or as imposed by
applicable securities laws, there are no restrictions on the transfer or voting of any shares of the Company’s capital stock. Other than as set forth 

  
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herein, there are no existing rights with respect to registration under the Securities Act of 1933, as amended (the “1933 Act”), of any of the Company’s capital stock. The Company
has not violated the 1933 Act or any state Blue Sky or securities laws in connection with the issuance of any of its securities. 
 2.4 Subsidiaries. Except as set forth on Schedule 2.4, the Company has no subsidiaries and has no investments in any other corporation or business organization. 

2.5 Financial Statements. Attached hereto as Schedule 2.5 are the Company’s unaudited balance sheet as of
December 31, 2002 and its unaudited statement of income and cash flows for the fiscal year then ended and its unaudited balance sheet as of June 30, 2003 and its unaudited statement of income and cash flows for the six month period then
ended (the “Financials”). The Financials fairly present the financial position of the Company as of such date and the results of operations for the period then ended, subject to normal year-end adjustments; provided, however, that no notes
to the Financials are included therein. 
 2.6 Absence of Undisclosed Liabilities. Except as and to the
extent reflected or reserved against in the Financials or as set forth in this Agreement or any Schedule to this Agreement and except for liabilities arising in the ordinary course of its business since December 31, 2002, the Company has no
material accrued or contingent liability arising out of any transaction or state of facts existing prior to the date hereof. 
 2.7 Absence of Certain Developments. To the best of the Company’s knowledge, since December 31, 2002, except as disclosed in Schedule 2.7, there has been no (i) material adverse
change in the condition, financial or otherwise, of the business of the Company or in the assets, liabilities, properties, or business, or prospects relating to the business of the Company, (ii) loss, destruction or damage to any property used
in the business of the Company whether or not insured, which loss would have a material adverse affect on the business of the Company, (iii) labor trouble involving the business of the Company or any material change in the personnel or the
terms and conditions of employment of those employed in the business of the Company, (iv) waiver of any valuable right relating to the business of the Company, (v) loan or extension of credit to any officer or employee employed in the
business of the Company or (vi) acquisition or disposition of any material assets used in the business of the Company (or any contract or arrangement therefor), or any other material transaction by the Company otherwise than for fair value in
the ordinary course of business. 
 2.8 Title to Properties. Except as set forth on Schedule 2.8 and other
than (i) any lien in respect of current taxes not yet due and payable and (ii) possible minor liens and encumbrances which do not in any case materially detract from the value of the property subject thereto or materially impair the
operations of the Company, and which have arisen in the ordinary course of the business of the Company and shall be removed within a reasonable period, the Company has good and marketable title to all real property and good title to properties and
assets that appear on the Company’s balance sheet, free and clear of all mortgages, security interests, liens, restrictions or encumbrances. All machinery and equipment included in such properties which is necessary to the business of the
Company is in satisfactory condition and repair except for reasonable wear and tear, and all leases of real or personal property to which the Company is a party are, to the Company’s knowledge, fully effective and afford the Company


  
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peaceful and undisturbed possession of the subject matter of the lease. To the best of the Company’s knowledge, the Company is not in material violation of any zoning, building or safety
ordinance, regulation or requirement or other law or regulation applicable to the operation of owned or leased properties likely to impede the normal operation of the business of the Company, nor has it received any notice of violation with which it
has not complied. 
 2.9 Tax Matters. Except as disclosed in Schedule 2.9, there are no federal, state,
county or local taxes due and payable with respect to the Company which have not been paid. The provisions for taxes in the Financials are sufficient for the payment of all accrued and unpaid federal, state, county and local taxes of the Company,
whether or not assessed or disputed as of the date of each such balance sheet. There have been no examinations or audits of any tax returns or reports of the Company by any applicable federal, state or local governmental agency. There have been duly
filed all federal, state, county and local tax returns required to have been filed by the Company and there are in effect no waivers of applicable statutes of limitations with respect to taxes for any year. 

2.10 Contracts and Commitments. Except for the contracts described in Schedule 2.10 hereto, the Company does not
have any contract, obligation or commitment which involves by its terms a commitment in excess of $100,000 and no employment contracts (including contracts with any common law employee, agent or independent contractor), stock redemption or purchase
agreements, financing agreements, distribution right agreements, royalty agreements, licenses under which the Company will be licensee, leases of real property, pension, profit-sharing, retirement or stock option plans. 

2.11 No Defaults. Except as set forth in Schedule 2.11, the Company is not in default (which default could have a
material adverse effect on the condition, financial or otherwise, of the Company or on its properties, assets, business or prospects) (a) under its charter documents or its By-Laws or any note, indenture, mortgage, lease, agreement, contract,
purchase order or other instrument, document or agreement to which it is a party or by which it or any of its property is bound or affected or (b) with respect to any order, writ, injunction or decree of any court or any federal, state,
municipal or other governmental department, commission, board, bureau, agency or instrumentality, domestic or foreign of which it has knowledge. There exists no condition, event or act which after notice, lapse of time, or both, could constitute a
default under any of the foregoing. Except as disclosed in Schedule 2.11, to the best of the Company’s knowledge, no third party is in default under any agreement, contract or other instrument, document, or agreement to which the Company is a
party or by which it or any of its property is affected, which default could have a material adverse effect on the condition, financial or otherwise, of the Company or on its properties, assets, business or prospects. 

2.12 Intellectual Property. To the best of the Company’s knowledge, the Company does not infringe any patent,
copyright, or trademark rights of others. To the best of the Company’s knowledge, all technical information developed and belonging to the Company which has not been patented has been kept confidential. Except as disclosed on Schedule 2.12, the
Company owns or has the perpetual right to use all trade secrets, customer lists, processes, computer software, patents, copyrights and trademarks required for, incident to or included in its products as currently exist and the Company believes that
it will be able to develop or acquire such rights necessary for the conduct of its business as currently proposed. To the best of its 

  
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knowledge, the Company is not using and has not used any confidential information, trade secrets, or computer software required for its products of any former employer of any of its past or
present employees. The Company has not sold or licensed its technology except for the granting of technology licenses in the ordinary course of business. 
 2.13 Effect of Transactions. The execution, delivery and performance of this Agreement, the Series H Notes, the Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement and
the Amendment and Waiver and any other agreements, instruments, or documents entered into by the Company pursuant to this Agreement, the Series H Notes, the Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement or the
Amendment and Waiver, the issuance, sale and delivery of the Non-Convertible Notes, the Series H Notes, the Note Shares upon conversion thereof and the Conversion Shares, and compliance with the provisions hereof and thereof by the Company, do not
and will not, with or without the passage of time or the giving of notice or both, (a) violate any provision of law, statute, rule or regulation or any ruling, writ, injunction, order, judgment or decree of any court, administrative agency or
other governmental body or (b) conflict with or result in any breach of any of the terms, conditions or provisions of, or constitute a default (or give rise to any right of termination, cancellation or acceleration) under, or result in the
creation of any lien, security interest, charge or encumbrance upon any of the properties or assets of the Company under the Certificate of Incorporation, as amended, or By-Laws of the Company or any note, indenture, mortgage, lease, agreement,
contract, purchase order or other instrument, document or agreement to which the Company is a party or by which it or any of its property is bound or affected. 
 2.14 No Governmental Consent or Approval Recruited. Based in part on the representations made by the Investors in Section 3 of this Agreement, other than federal or state securities law filings
which have been made or which will be made in a timely manner and other than the filing of an amendment to the Company’s Certificate of Incorporation so that such Certificate of Incorporation, as amended, is in the form of Exhibit D
hereto (which, as of the Closing, has been filed), no authorization, consent, approval or other order of, declaration to, or filing with, any governmental agency or body is required for or in connection with the valid and lawful authorization,
execution and delivery by the Company of this Agreement, the Series H Notes, the Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement, the Amendment and Waiver or any other agreements, instruments or documents entered into
by the Company pursuant to this Agreement, the Series H Notes, the Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement or the Amendment and Waiver, or for or in connection with the valid and lawful authorization, issuance,
sale and delivery of the Series H Notes to the Investor, for or in connection with the valid and lawful authorization, reservation, issuance, sale and delivery to the Investors of the Note Shares upon conversion of the Series H Notes, or for or in
connection with the valid and lawful authorization, reservation, issuance, sale and delivery to the Investors of the Conversion Shares. 
 2.15 Litigation. There is no action, suit, proceeding or investigation pending, or to the best knowledge of the Company, threatened against the Company which questions the validity of this
Agreement, the Series H Notes, the Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement, the Amendment and Waiver or any other agreements, instruments or documents entered into by the Company pursuant to this Agreement, the
Series H Notes, the Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement, or 

  
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the Amendment and Waiver or the right of the Company to enter into them or to consummate the transactions contemplated hereby or thereby, or which might result, either individually or in the
aggregate, in any material adverse change in the business, assets, conditions, operations, affairs, or, in the reasonable business judgment of the Company, prospects of the Company, financial or otherwise, or any change in the current equity
ownership of the Company, nor is the Company aware that there is any basis for the foregoing. The foregoing includes, without limitation, actions pending or, to the best knowledge of the Company, threatened (or any basis therefor known to the
Company) involving the prior employment of any of the Company’s employees, their use in connection with the Company’s business of any information, creations or techniques allegedly proprietary to any of their former employers or other
persons or entities, or their obligations under any agreements with prior employers or other persons or entities. None of the Company or any of its officers is a party to, or subject to the provisions of, any order, writ, injunction, judgment or
decree of any court or governmental agency or instrumentality. There is no action, suit or proceeding initiated by the Company currently pending or which the Company presently intends to initiate. 

2.16 Securities Laws. Neither the Company nor any other person, firm or corporation acting on its behalf has sold
any of the Series H Notes, the Non-Convertible Notes, the Note Shares or other securities of the Company to, or offered any thereof for sale to, or solicited any offers to purchase any thereof from, or otherwise approached or negotiated (nor will
the Company or any other person, firm or corporation acting on its behalf sell, offer, solicit or otherwise approach or negotiate) in respect thereof with, such number or character of persons in the aggregate, or in such manner, as would result in
bringing the Note Shares or the Conversion Shares or any part thereof or any other securities of the Company, within the provisions of Section 5 of the 1933 Act. Assuming that the Investors’ representations and warranties contained in
Section 3 of this Agreement are true and correct, the offer, issuance and sale of the Note Shares and the Conversion Shares are and will be exempt from the registration and prospectus delivery requirements of the 1933 Act, and have been registered
or qualified (or are exempt from registration and qualification) under the registration, permit or qualification requirements of all applicable state Blue Sky and securities laws. 

2.17 Business. The Company has all necessary franchises, permits, licenses and other rights and privileges
necessary to permit it to own its property and to conduct its business as now being conducted. The Company is not in violation of any law, regulation, authorization or order of any public authority relevant to the ownership of its properties or the
carrying on of the Company’s business which in the aggregate would have a material adverse effect on the Company. 
 2.18 Brokerage. There are no claims for brokerage commissions or finder’s fees or similar compensation in connection with the transactions contemplated by this Agreement based on any
arrangement made by or on behalf of the Company, and the Company agrees to indemnify and hold the Investors harmless against any damages incurred as a result of any such claim. 

  
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 2.19 Employees. There are no controversies or labor troubles pending,
or to the best knowledge of the Company after due inquiry, threatened between it and its employees. Except as set forth in Schedule 2.19, to the best of the Company’s knowledge: (a) no employee of the Company is in violation of any term of
any employment contract, patent or other proprietary information disclosure agreement or any other contract or agreement relating to the right of any such employee to be employed by the Company because of the nature of the business conducted or
proposed to be conducted by the Company or for any other reason, and the continued employment by the Company of its respective present employees will not result in any such violation; (b) no officer or key employee, has any present intention of
terminating his or her employment with the Company nor does the Company have any present intention of terminating any such employment; and (c) the Company has complied in all material respects with all applicable state and federal laws and
regulations respecting employment and employment practices, terms and conditions of employment, wages and hours and other laws related to employment, and there are no arrears in the payments of wages, withholding or social security taxes,
unemployment insurance premiums or other similar obligations. Except as set forth in Schedule 2.19, the Company is not a party to any written agreement or oral agreement which obligates the Company to retain the services of any employee for more
than 120 days, with any of its officers or employees with respect to such person’s employment with the Company. 
 2.20 Insurance. The Company maintains in full force such types and amounts of insurance issued by issuers of recognized responsibility insuring the Company with respect to its respective business
and properties, in such amounts and against such losses and risks as are appropriate for the Company’s business. 
 2.21 Environmental and Safety Laws. 
 (a) As used in this
Agreement, the terms “Removal,” “Remedial Action,” “Release,” “Hazardous Substance” and “National Priorities List” shall have the same meaning as those terms are given in the Comprehensive
Environmental Response Compensation and Liability Act (“CERCLA”) and its implementing regulations, and the terms “Hazardous Waste” and “Solid Waste” shall have the same meaning as those terms are given in the Resource
Conservation and Recovery Act, as amended (“RCRA”) and its implementing regulations. 
 (b) The
ownership, use and operation of the Company’s business has been in compliance in all material respects with all Federal, state and local environmental and safety laws, including without limitation RCRA, its implementing regulations and all
applicable state hazardous waste laws; the Clean Water Act, as amended, its implementing regulations and all applicable state and local effluent discharge laws; the Clean Air Act, as amended, its implementing regulations and all applicable state and
local air emission laws; the Toxic Substances Control Act, as amended, its implementing regulations and all applicable state and local toxic substance laws; CERCLA, its implementing regulations and all applicable state and local environmental
response, compensation and liability laws; the National Environmental Policy Act of 1969 and its implementing regulations; the Occupational Safety and Health Act, its implementing regulations and all applicable state and local worker safety and
health laws; and all such laws concerning particulate emissions, hazard communication, surface water pollution, groundwater pollution, air pollution, solid wastes, hazardous wastes, hazardous substances, toxic substances, storage, handling,
treatment, transportation, spills or other releases, and disposal of any substance, chemicals, materials or wastes, and exposure to or notification regarding any substance, chemical, material or waste, and the Company has no reason to believe that
any claim, action, lawsuit, proceeding, complaint or charge exists or may be brought for violation of any such laws. 

  
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 (c) To the Company’s knowledge, there has not been, and is not
occurring, at the Company’s facility at 450 Bedford Street, Lexington, Massachusetts or any facility previously owned or operated by the Company any Release or threatened Release of any Hazardous Substance, Hazardous Waste, Solid Waste or
petroleum, including crude oil or any fraction thereof, nor has the Company any reason to believe such a Release either is occurring or has occurred at any time in the past under its operation. The Company has not applied or disposed of any
Hazardous Substance, Hazardous Waste, Solid Waste or petroleum, including crude oil or any fraction thereof, in any manner which may form the basis for any present or future claim, demand or action seeking investigation, Removal, or Remedial Action
at any facility, site, location or body of water, surface or subsurface, including groundwater or any costs or expenses related thereto. 
 (d) The Company has not sent, arranged for disposal or treatment, arranged with a transporter for transport for disposal or treatment, transported, or accepted for transport any Hazardous Substance,
Hazardous Waste or petroleum, including crude oil or any fraction thereof, to a facility, site or location. 

(e) The Company has not stored, generated or produced any Hazardous Substance, Hazardous Waste, or petroleum in material
violation of any law. 
 (f) To the Company’s knowledge, the facility at 450 Bedford Street, Lexington,
Massachusetts has been approved by all necessary governmental authorities, and the Company has obtained and is in possession of all material environmental and safety permits and licenses necessary for its business including permits required by local
zoning laws, if any. 
 2.22 Retirement Obligations, etc.. Except as disclosed in Schedule 2.22, the
Company does not have any pension, retirement or similar plan or obligation, whether of a legally binding nature or in the nature of informal understandings. The Company is not a party to any collective bargaining agreement and, to the
Company’s knowledge after due inquiry, no organizational efforts are presently being made with respect to any of its employees. 
 2.23 Transactions with Affiliates. Except as disclosed in Schedule 2.23, no stockholder, officer or director of the Company nor any “affiliate” or “associate” of such Persons
(as such terms are defined in the rules and regulations promulgated under the 1933 Act) (herein, a “Related Party”) is a party to any transaction with the Company, including, without limitation, any contract, agreement or other arrangement
providing for the rental of real or personal property from, or otherwise requiring payments to, any Related Party. Except as set forth in Schedule 2.23 no employee of the Company nor any Related Party is indebted in an amount greater than $5,000 to
the Company and the Company is not indebted to any such employee or Related Party. 
 2.24 Books and
Records. The minute books of the Company contain accurate records of all meetings and other corporate actions of the Company’s stockholders, Board of Directors and all committees, if any, appointed by its Board of Directors. The
Company’s stock ledger is complete and reflects all issuances, transfers, repurchases and cancellations of shares of capital stock of the Company. The books of account, ledgers, order books, records and


  
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documents of the Company accurately reflect all material information relating to its business, the nature, acquisition, maintenance, location and collection of its assets and the nature of all
transactions giving rise to its obligations and its accounts receivable. 
 2.25 Equal Employment
Opportunity. To the best of the Company’s knowledge the Company is in material compliance with (a) all applicable laws of the United States and of The Commonwealth of Massachusetts relating to equal employment opportunity (including,
without limitation, Title VII of the Civil Rights Act of 1964, as amended (42 U.S.C. Section 2000e-17), the Age Discrimination in Employment Act of 1967, as amended (29 U.S.C. Sections 621-634), the Equal Pay Act of 1963 (29 U.S.C.
Section 206(d)), and any rules, regulations, and administrative orders relating thereto; Mass. Gen. Laws c. 151B, Mass. Gen. Laws c. 149 Section 24A, et seq., and 105A, et seq., and any rules or regulations relating thereto); and
(b) the applicable terms, relating to equal employment opportunity, of any contract, agreement or grant the Company has with, from or relating (by way of subcontract or otherwise) to any other contract, agreement or grant of, any federal or
state governmental unit (“Government Contract”), including, without limitation, any terms required pursuant to Federal Executive Order No. 11246 and Massachusetts Executive Order No. 74 (both as amended). To the best of the
Company’s knowledge, the Company has kept all records required to be kept, and has filed all reports, affirmative action plans and forms (including, without limitation and where applicable, Form EEO-1) required to be filed pursuant to any such
applicable law or the terms of any such Government Contract. The Company has not been subject to any adverse final determination or order with respect to any charge of employment discrimination made against it, by the United States Equal Employment
Opportunity Commission, the Massachusetts Commission Against Discrimination or any other governmental unit (including, without limitation, any such governmental unit with which it has a Government Contract), and it is not currently, to the
Company’s knowledge, subject to any formal proceedings before, or investigations by, such commissions or governmental units which may lead to such adverse final determination order. 

2.26 Material Facts. None of this Agreement, the Schedules hereto and furnished contemporaneously herewith, or any
other agreement, document, certificate or written statement furnished or to be furnished to the Investors through the Closing by or on behalf of the Company in connection with the transactions contemplated hereby contains any untrue statement of a
material fact or omits to state a material fact necessary to make the statements contained therein or herein in light of the circumstances in which they were made not misleading. To the best of the Company’s knowledge, there is no fact known by
the Company which has not been disclosed herein or otherwise by the Company to the Investors and which may materially adversely affect the business, properties, assets or condition, financial or otherwise, of the Company except for facts relating to
general economic conditions which may affect all companies which are in a similar industry the same. 

  
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 3. Representations and Warranties and other Agreements of the Investors. 

3.1 Representations and Warranties. Each Investor hereby represents and warrants that: 

(a) Authorization. The Investor has full power and authority to execute, deliver and perform this Agreement and the
Right of First Refusal and Co-Sale Rights Agreement and to acquire the Non-Convertible Notes, Series H Notes and the Note Shares upon conversion thereof; this Agreement and the Right of First Refusal and Co-Sale Rights Agreement constitute the valid
and legally binding obligation of the Investor, enforceable against the Investor in accordance with their respective terms subject to applicable bankruptcy, fraudulent conveyance, insolvency, reorganization, moratorium and similar laws affecting
creditors’ rights generally and by general equitable principles. 
 (b) Purchase Entirely for own
Account. The Series H Notes to be received by the Investor, the Note Shares received upon conversion of the Series H Notes and the Conversion Shares received upon conversion of the Note Shares (collectively, the “Securities”) will be
acquired for investment for the Investor’s own account, not as a nominee or agent and not with a view to or for sale in connection with the distribution of any part thereof. The Investor has no present intention of selling, granting any
participation in, or otherwise distributing the same, all without prejudice, however, to the Investor’s right at any time to lawfully sell or otherwise dispose of all or any of the Securities. The Investor does not have any contract,
undertaking, agreement or arrangement with any person to sell, transfer, or grant participations to such person or to any third person, with respect to any of the Securities. 

(c) Restricted Securities. The Investor understands that the Securities may not be sold, transferred, or otherwise
disposed of without registration under the 1933 Act, or an exemption therefrom, and that in the absence of an effective registration statement covering the Series H Notes, the Note Shares or the Conversion Shares or an available exemption from
registration under the 1933 Act, the Securities must be held indefinitely. In the absence of an effective registration statement covering the Securities the Investor will sell, transfer, or otherwise dispose of the Securities only in a manner
consistent with its representations and agreements set forth herein. 
 (d) Formation. The Investor
represents that it was not organized for the purpose of making an investment in the Company. 
 (e)
Suitability. The Investor is an Accredited Investor as such term is defined in Rule 501(a) promulgated pursuant to the 1933 Act. 
 (f) Financial Condition. The Investor’s financial condition is such that it is able to bear the risk of holding the Series H Notes and the Note Shares for an indefinite period of time.

 (g) Experience. The Investor has such knowledge and experience in financial and business matters and in
making high risk investments of this type that it is capable of evaluating the merits and risks of the purchase of the Series H Notes. 
 (h) Receipt of Information. The Investor has been furnished access to the business records of the Company and such additional information and documents as the Investor has requested and has been
afforded an opportunity to ask questions of and receive answers from representatives of the Company concerning the terms and conditions of this Agreement, the purchase of the Non-Convertible Notes and Series H Notes, the Company’s business,
operations, market potential, capitalization, financial condition and prospects, and all other matters deemed relevant by the Investor. 

  
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 (i) Brokerage. There are no claims for brokerage commissions or
finder’s fees or similar compensation in connection with the transactions contemplated by this Agreement based on any arrangement or agreement made by or on behalf of the Investor, and the Investor agrees to indemnify and hold the Company
harmless against any damages incurred as a result of any such claims. 
 3.2 Further Limitations on
Disposition. 
 (a) The Investor further agrees not to make any transfer of all or any portion of the Series
H Notes, the Note Shares or the Conversion Shares unless and until there is then in effect a registration statement under the 1933 Act covering such proposed disposition and such disposition is made in accordance with such registration statement and
all applicable state securities laws or unless the Investor has received an opinion of counsel satisfactory to the Company that such registration is not required; provided, however, the Company will not require such opinion of counsel if at the time
of such sale the Company is subject to the reporting requirements of either Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, such proposed sale is pursuant to Rule 144 as promulgated under the Securities Act of 1933, as
amended and such opinion is not required by the relevant broker-dealer. 
 (b) Notwithstanding the provisions of
paragraph (a), the Investor may transfer to a partner (or members or partners of a partner), subsidiary, shareholder, spouse, child or affiliate of the Investor, trust for the benefit of such Investor’s spouse or child or a charitable
organization, if the transferee agrees in writing to be subject to the terms hereof to the same extent as if such transferee were an original Investor hereunder (such persons or entities hereinafter referred to as “Permitted Transferees”).

 3.3 Legends. It is understood that the certificates evidencing the Series H Notes, the Note Shares (and
the certificates evidencing the Conversion Shares) may bear substantially the following legends: 
 (a)
“These securities have not been registered under the Securities Act of 1933 or registered or qualified under any state securities laws. They may not be sold, offered for sale, pledged or hypothecated in the absence of a registration statement
in effect with respect to the securities under such Act and registration or qualification under applicable state securities laws or an opinion of counsel, if required, satisfactory to the Company that such registration or qualification is not
required. Furthermore, the securities are subject to a certain Note Purchase Agreement dated February 9, 2004 between the Holder and the Company, a copy of which is on file at the Company’s offices.” 

(b) Any legend required by the laws of any other applicable jurisdiction. 

(c) Such legends as are required by the Right of First Refusal and Co-Sale Rights Agreement 

4. Conditions to the Investor’s Obligations at the Closing. 

  
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 The obligation of the Investors under Section 1.3 of this Agreement is subject to the
fulfillment on or before the Closing of each of the following conditions: 
 4.1 Representations and
Warranties. The representations and warranties of the Company contained in Section 2 shall be true and correct on and as of the date of the Closing with the same effect as though such representations and warranties had been made on and as of the
date of the Closing. 
 4.2 Performance. The Company shall have performed and complied with all
agreements, obligations, and conditions contained in this Agreement that are required to be performed or complied with by it on or before the Closing. 
 4.3 Compliance Certificate. The Chief Executive Officer of the Company shall deliver to the Investors at the Closing a certificate certifying that the conditions specified in Sections 4.1, 4.2, 4.4
and 4.5 have been fulfilled and stating that there has been no material adverse change in the business affairs, operations, properties, assets, or condition of the Company or, in the reasonable judgement of the Company, the prospects of the Company
since December 31, 2002. 
 4.4 Amendment of Certificate of Incorporation. The Company shall have
filed with the Secretary of State of the State of Delaware the an amendment to the Certificate of Incorporation of the Company in the form of Exhibit D. 
 4.5 Qualifications. All authorizations, approvals, or permits, if any, of any governmental authority or regulatory body of the United States or of any state that are required in connection with the
lawful issuance and sale of the Note Shares to the Investors pursuant to this Agreement shall have been duly obtained and shall be effective on and as of the Closing other than those which are not required to be obtained before the Closing.

 4.6 Proceedings and Documents. All corporate and other proceedings in connection with the transactions
contemplated at the Closing and all documents incident thereto shall be reasonably satisfactory in form and substance to the Investors and they shall have received all such counterpart original and certified or other copies of such documents as they
may reasonably request. 
 4.7 Opinion of Company Counsel. The Investors shall have received from Foley
Hoag LLP, counsel for the Company, an opinion dated as of the Closing in substantially the form attached hereto as Exhibit E. 
 4.8 Clerk’s Certificate. The Clerk or an Assistant Clerk of the Company shall deliver to the Investors at such Closing a certificate, dated as of the Closing, certifying: (a) that
attached thereto is a true and complete copy of all waivers obtained from, and resolutions and votes adopted by, the Board of Directors and the Stockholders of the Company authorizing the execution, delivery and performance of this Agreement, the
Series H Notes, the Non-Convertible Notes, the Right of First Refusal and Co-Sale Rights Agreement and the Amendment and Waiver, the issuance, sale and delivery of the Note Shares and reservation, issuance and delivery of the Conversion Shares;
(b) that attached thereto is a true and complete copy of the Amended and Restated Certificate of Incorporation, as in effect on the date of such certification; and (c) to the incumbency and specimen signature of certain officers of the
Company. 

  
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 4.9 Right of First Refusal and Co-Sale Rights Agreement. The Company
and certain stockholders of the Company shall have entered into the Third Restated Right of First Refusal and Co-Sale Rights Agreement substantially in the form of Exhibit F hereto (the “Right of First Refusal and Co-Sale Rights
Agreement”). 
 5. Conditions of the Company’s Obligations at the Closing. 

The obligations of the Company under Section 1.2 of this Agreement is subject to the fulfillment on or before the Closing of each of the
following conditions: 
 5.1 Representations and Warranties. The representations and warranties of the
Investors contained in Section 3 shall be true and correct on and as of the date of the Closing with the same effect as though such representations and warranties had been made on and as of the date of the Closing. 

5.2 Delivery of Bridge Notes. Each Investor shall have delivered to the Company the original Bridge Notes to be
converted into Series H Notes. 
 5.3 Right of First Refusal and Co-Sale Rights Agreement. The Company and
certain stockholders of the Company shall have entered into the Right of First Refusal and Co-Sale Rights Agreement. 
 6.
Covenants of the Company. Until the earlier of (i) the closing of an underwritten public offering pursuant to an effective registration statement under the Securities Act of 1933, as amended, covering the offer and sale of Common Stock
for the account of the Company to the public generally in which the aggregate proceeds to the Company are not less than $25 million which results in the automatic conversion of the Note Shares (a “Qualified Public Offering”) and, with
respect to any Investor, (ii) the first date on which an Investor, any Permitted Transferee or any Qualified Buyer no longer holds fifty percent (50%) of the Note Shares acquired upon conversion of its Series H Note (or of the Conversion
Shares upon conversion of the Note Shares): 
 6.1 Financial and Other Information. 

(a) Accounts and Reports. The Company will maintain a standard system of accounts in accordance with generally
accepted accounting principles consistently applied; 
 (b) Annual Financial Statements. The Company will
deliver to each Investor, each Permitted Transferee and each Qualified Buyer: (i) within one hundred and eighty (180) days after the end of each fiscal year a copy of the audited consolidated and consolidating balance sheet of the Company
as of the end of such year, together with audited consolidated and consolidating statements of income and of cash flows of the Company for such year, all in reasonable detail, prepared in accordance with generally accepted accounting principles,
consistently applied, and certified by Vitale, Caturano & Company, PC or by another 

  
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independent public accountant of national standing selected by the Board of Directors of the Company and mutually agreeable to the Investors; and (ii) copies of all financial statements and
reports which the Company shall send to its stockholders or file with the Securities and Exchange Commission or any stock exchange on which any securities of the Company may be listed. 

(c) Quarterly Financial Statements and Budgets. The Company will furnish to each Investor, each Permitted
Transferee and each Qualified Buyer: within thirty (30) days after the end of each quarter, other than the last quarter of the fiscal year of the Company, a copy of the consolidated and consolidating balance sheet of the Company as of the end
of such quarter and consolidated and consolidating statements of income and of cash flows of the Company for such quarter, each of the foregoing balance sheets and statements to set forth in comparative form the corresponding figures for the prior
fiscal period, to be in reasonable detail, to be prepared in accordance with generally accepted accounting principles, consistently applied, and to be certified, subject to normal year-end audit adjustments, by the principal financial officer of the
Company that they are true and accurate in all material respects as of their dates; and as soon as possible, but in any event at least thirty (30) days prior to the beginning of each fiscal year, a budget and operating plan for such fiscal
year, each approved by the Company’s Board of Directors, prepared on a quarterly basis, including projected balance sheets and statements of income and changes in financial condition of the Company for such quarters. 

(d) Visits and Discussions. The Company will permit the authorized representatives of each Investor, each Permitted
Transferee thereof and the Qualified Buyer, at all reasonable times during normal business hours and as often as reasonably requested, to visit and inspect, at the expense of such Investor, any of the properties of the Company, including its books
and records and, subject to reasonable arrangements with any transfer agents of the Company, lists of security holders, and to make extracts therefrom and to discuss the affairs, finances, and accounts of the Company with its officers. 

(e) Adverse Change: Litigation. The Company will promptly advise each Investor, each Permitted Transferee and each
Qualified Buyer in writing of each suit or proceeding commenced or threatened against the Company which, if adversely determined, would result in a material adverse change in the condition or business, financial or otherwise, of the Company and of
any facts that come to the Company’s attention which question the accuracy or completeness of the representations and warranties contained herein when made. 

(f) Other Information. The Company will also furnish to each Investor, each Permitted Transferee and each Qualified
Buyer with reasonable promptness, other information and data with respect to the Company as such Investor and each Permitted Transferee and Qualified Buyer may from time to time reasonably request. 

6.2 Confidentiality. Any person or entity receiving information under Section 6.1 or any of the schedules or
exhibits hereto or exercising rights of visitation or inspection granted hereunder shall maintain the confidentiality of all financial, confidential and proprietary information of the Company acquired by them in exercising such rights.
Notwithstanding the preceding sentence, each Investor or any Permitted Transferee or Qualified Buyer may (1) disclose such information when required by law or governmental order or regulation, or when


  
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required by a subpoena or other process, (2) disclose such information to the extent necessary to enforce this Agreement, or (3) disclose such information to its attorneys, accountants,
consultants and other professionals to the extent necessary to obtain their services in connection with its investment in the Company. Each Investor may also disclose such information to any affiliate of the Investor, or, to a partner, shareholder
or subsidiary of the Investor provided that the requirements of this subsection shall in turn be binding on any such affiliate, partner, shareholder or subsidiary. 

6.3 Insurance. The Company will keep all its insurable properties properly insured against loss or damage by fire
and other risks; maintain public liability insurance against claims for personal injury, death or property damage suffered by others upon or in or about any premises occupied by it or arising from equipment owned by the Company and leased to and
located upon or in or about any premises occupied by any other person; maintain all such worker’s compensation or similar insurance as may be required under the laws of any state or jurisdiction in which it may be engaged in business; and
maintain such other insurance as is usually maintained by persons engaged in the same or similar business as is the Company. All such insurance shall be maintained against such risks and in at least such amounts as such insurance is usually carried
by persons engaged in the same or similar businesses, and all insurance herein provided for shall be effected and maintained in force under a policy or policies issued by insurers of recognized responsibility, except that the Company may effect
worker’s compensation or similar insurance in respect of operations in any state or other jurisdiction either through an insurance fund operated by such state or other jurisdiction or by causing to be maintained a system or systems of
self-insurance which is in accord with applicable laws. The Company’s executive officers shall periodically report to the Board of Directors on the status of the insurance coverage of the Company. 

6.4 Prepayment of Taxes; Corporate Existence. The Company will: 

(a) pay and discharge promptly, or cause to be paid and discharged promptly, when due and payable, all taxes, assessments
and governmental charges or levies imposed upon it or upon its income or upon any of its property, real, personal and mixed, or upon any part thereof, as well as all claims of any kind (including claims for labor, materials and supplies) which, if
unpaid might by law become a lien or charge upon its property; provided, however, that the Company shall not be required to pay any tax, assessment, charge, levy or claim if the amount, applicability or validity thereof shall currently be contested
in good faith by appropriate proceedings and if the Company shall have set aside on its books reserves (classified to the extent required by generally accepted accounting principles) deemed by it adequate with respect thereto; and provided further,
that the Company shall have no obligation to make any payments under this paragraph (a) with respect to property subject to leases pursuant to the terms of which the lessees thereof have undertaken to make such payments; 

(b) do or cause to be done all things necessary to preserve and keep in full force and effect its corporate existence,
rights and franchises, provided, however, that nothing in this paragraph (b) shall (i) prevent the abandonment or termination of the Company’s authorization to do business in any foreign state or jurisdiction if, in the opinion of the
Company’s Board of Directors, such abandonment or termination is in the interest of the Company and not disadvantageous in any material respect to the holders of any Series H Notes or Note Shares or (ii) require compliance with any law so
long as the validity or applicability thereof shall be disputed or contested in good faith; and 

  
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 (c) maintain and keep, or cause to be maintained and kept, its properties in
good repair, working order and condition, and from time to time make, or cause to be made, all repairs, renewals and replacements which in the opinion of the Company are necessary and proper so that the business carried on in connection therewith
may be properly and advantageously conducted at all times. 
 6.5 Dealings with Affiliates and Others.
Other than ordinary and usual compensation arrangements, the Company shall not (i) enter into any transaction, including, without limitation, any loans or extensions of credit or royalty agreements, with any officers or directors of the
Company, or (ii) enter into any transaction with a holder of five percent (5%) or more of the Common Stock of the Company, or any member of their respective families or any corporation or other entity directly or indirectly controlled by
one or more of such officers, directors or stockholders or members of their families, without the prior consent of the members of the Board of Directors elected by the Investors. 

6.6 Change in Nature of Business. The Company shall not without the prior consent of the members of the Board of
Directors elected by the Investors make any material and fundamental change in its product line or its line of business as carried on at the date hereof or as contemplated in the Company’s business plan delivered to the Investors prior to the
date hereof. 
 6.7 Incurrence of Debt, etc. The Company agrees that without the prior consent of the
members of the Board of Directors elected by the Investors, the Company shall not make any loans or guarantees, enter into any joint venture or invest in any entity which is not a wholly-owned subsidiary. 

6.8 Equal Employment Opportunity. The Company will (a) comply with all applicable laws of the United States
and of The Commonwealth of Massachusetts relating to equal employment opportunity, any rules, regulations, administrative orders and Executive Orders relating thereto and the applicable terms, relating to equal employment opportunity, of any
Government Contract; and (b) keep all records required to be kept, and file all reports, affirmative action plans and forms required to be filed pursuant to any such applicable law or the terms of any such Government Contract; provided,
however, the Company shall not be considered to have failed to comply with the foregoing during any period that any matter relating to the Company’s employment practices is being contested by the Company in appropriate proceedings, or
thereafter, if the Company complies with any final determination issued in such proceedings 
 7. Participation Rights in
Future Financings. 
 7.1 Right of First Refusal. The Company shall, prior to any issuance by the
Company of any of its securities (other than debt securities with no equity feature) (the “Future Shares”), offer to each Investor the right to purchase its Proportionate Percentage (as defined in Section 7.4) of the Future Shares at a
price and on the other terms specified by the Company in writing delivered to the Investor (the “Proposal”). The Proposal by its terms shall remain open and irrevocable for a period of thirty (30) days (the “Exercise
Period”). 

  
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 7.2 Notice. Notice of an Investor’s intention to accept, in
whole or in part, the Proposal made pursuant to Section 7.1 shall be evidenced by a writing signed by such Investor and delivered to the Company prior to the end of the Exercise Period setting forth that portion of the Future Shares which the
Investor elects to purchase (the “Notice of Purchase”). 
 7.3 Sale to Third Parties. In the
event that the Investors elect not to purchase all (or any part) of the Future Shares, the Company shall have 120 days from the expiration of the Exercise Period to sell all or any part of such Future Shares not purchased by the Investors (the
“Refused Future Shares”) to the third-party purchaser, but only upon terms and conditions in all respects (including, without limitation, unit price and interest rates) which are no more favorable to such third-party purchaser or less
favorable to the Company than those set forth in the Proposal. In the event that the Company so sells the Refused Future Shares to such third-party purchaser, the sale to the Investors of Future Shares in respect of which a Notice of Purchase was
delivered to the Company by the Investors shall occur upon the closing of the sale to such third-party purchaser of Refused Future Shares (which closing shall include full payment to the Company). If there are no Refused Future Shares, the sale to
the Investors of such Future Shares shall occur within 20 days of the expiration of the Future Shares Exercise Period. In any event, the sale to the Investors of Future Shares shall be on the terms specified in the Proposal. Any Refused Future
Shares not purchased by such third-party purchaser within such 120-day period shall remain subject to this Section 7. 
 7.4 Proportionate Percentage. The term “Proportionate Percentage” in Section 7.1 shall mean, that percentage figure which expresses the ratio which (i) the number of shares of Common
Stock, $.001 par value, of the Company (“Common Stock”) then owned by the Investor bears to (ii) the aggregate number of shares of Common Stock (a) outstanding and (b) issuable upon conversion or exercise of securities which
are then convertible into or exercisable for Common Stock. For purposes of the computation required under this Section 7.4, the Investor shall be treated as having converted or exercised all securities which are convertible into or exercisable for
shares of Common Stock at the rate at which such securities are convertible into or exercisable for Common Stock at the time of such computation. 
 7.5 Exceptions. Notwithstanding anything to the contrary stated above, the provisions of, and the right of the Investors under this Section 7 shall not apply to (i) Future Shares issued in
connection with stock splits or stock dividends issued on a pro rata basis to the holders of all shares of Common Stock outstanding or issuable upon conversion of any security which is convertible into Common Stock (the “Common Stock
Equivalents”), in accordance with the number of shares of Common Stock and Common Stock Equivalents held by such holder, (ii) Future Shares issued upon conversion of the Note Shares, (iii) any sale of Future Shares pursuant to a
Qualified Public Offering, (iv) any sale of Future Shares pursuant to any warrants or arrangements listed in Schedule 2.3A, (v) any sale or grant of Future Shares by the Company to its employees, consultants, advisory committee members or
directors, pursuant to a bona fide employee stock purchase, option or similar benefit plan or other arrangement approved by the Company’s Board of Directors or (vi) any sale of Future Shares pursuant to or in connection with an acquisition
of securities or assets by the Company which has been approved in advance in writing by the Investor including but not limited to shares issued to business corporations for strategic purposes. 

  
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 8. Registration Rights. 

8.1 Definitions. As used in this Agreement: 

(a) The term “Registrable Securities” means the shares of Common Stock of any Holder (as defined in Section 8.2)
issued or issuable (i) upon conversion of the Series A Preferred Stock, the Series B Preferred Stock, the Series C Preferred Stock, the Series D Preferred Stock issued or issuable upon exercise of the Company’s Warrant dated
September 27, 1996 issued to Sun Microsystems, Inc., the Series E Preferred Stock, the Series F Preferred Stock, Series G Preferred Stock or the Series H Preferred Stock, (ii) upon exercise of the Company’s Warrant dated
November 2, 1994 issued to Fidelity, the Company’s Warrant dated April 30, 1993 issued to Fidelity and the Company’s Warrant dated September 16, 1994 issued to Fidelity, (iii) upon exercise of the Company’s
Warrants dated December 26, 1995 issued to Fidelity, BCV III, Massachusetts Capital Resource Company, Edelson, Associated Group, Inc., John J. Shields, III and John William Poduska, (iv) upon exercise of the Company’s Warrants dated
January 28, 1998 issued to Ford Motor Company, Itochu Techno-Science Corporation, BCV III, Edelson, Associated Group, Inc., John William Poduska, Sr. and King’s Point Holdings, Inc.; and (v) shares of Common Stock owned by Messrs. Kim
Molvig and Robert Iannucci. 
 (b) The term “Holder” means each Investor, each “Investor”
under the Series A Preferred Stock and Warrant Purchase Agreement dated as of April 30, 1993, as amended, the Series B Convertible Preferred Stock Purchase Agreement dated as of November 2, 1994, as amended, the Series C Convertible
Preferred Stock Purchase Agreement dated as of September 30, 1996, as amended, the Series E Convertible Preferred Stock Purchase Agreement dated as of January 28, 1998, as amended, and the Series F Convertible Preferred Purchase Agreement
dated as of January 28, 1998, as amended, Sun Microsystems, Inc. and Messrs. Molvig and Iannucci and any Qualified Buyer (as defined below) or Permitted Transferee of all or a portion of the holders’s rights under this Section 8 provided
that any Qualified Buyer or Permitted Transferee must hold at least 25,000 shares (as adjusted for stock splits, stock dividends, etc.). 
 (c) The term “Initiating Holders” shall mean any Holder or Holders who in the aggregate are Holders of fifty percent (50%) or more of the Registrable Securities. 

(d) The term “Qualified Buyer” shall mean a purchaser of Preferred Stock or shares of Common Stock issued upon
conversion of Preferred Stock in compliance with the purchase agreement or convertible promissory note governing the original issuance of such shares and the Third Right of First Refusal Agreement. 

(e) The term “Permitted Transferee” shall mean a partner, subsidiary, shareholder, spouse, child or affiliate of
the Investor, a trust for the benefit of such Investor’s spouse or child or a charitable organization, if the transferee agrees in writing to be subject to the terms hereof to the same extent as if such transferee were an original Investor
hereunder. 
 8.2 Demand Registration. 

  
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 (a) If, on or after the earlier to occur of December 31, 2006, or the
expiration of 180 days after the Company shall have first offered its securities pursuant to a registration under the 1933 Act, Initiating Holders shall notify the Company in writing that such Holders intend to offer or cause to be offered for sale
to the public all or any portion of the Registrable Securities under such circumstances as would require registration thereof under the 1933 Act or qualification thereof under one or more state securities laws of jurisdictions in which the offer is
to be made, the Company will, as expeditiously as possible, (i) notify Holders other than the Initiating Holders that it has been requested to register Registrable Securities under the 1933 Act pursuant to this Section 8.2, and (ii) use
its best efforts to cause such securities as may be requested by any Holder thereof to be registered under the 1933 Act, if applicable, and registered or qualified under any state securities laws to the extent required (in the opinion of counsel
referred to in this Section 8.2) to permit the sale or other disposition thereof in the manner described by the person requesting such registration. The Holders shall have a total of four such rights to demand registration of Registrable Securities
under this Section 8.2. In addition to the above-described demand registration rights, the holders of Preferred Stock of the Company shall have a total of two rights to demand registration of Registrable Securities held by them under this Section
8.2. 
 (b) If holders of securities of the Company other than Holders who are entitled, by contract with the
Company, to have such securities included in such a registration (the “Other Holders”) request such inclusion, the Initiating Holders shall offer to include the securities of such other Holders in any registration pursuant to this Section
8.2. The Company (together with all Holders and Other Holders proposing to include their securities in such registration) shall enter into an underwriting agreement in customary form with the underwriter or representative of the underwriters (the
“Underwriter”) selected to underwrite such offering by a majority in interest of the Initiating Holders, subject to the approval of the Company, which approval shall not be unreasonably withheld. Notwithstanding any other provision of this
Section 8.2, if the underwriter advises the Initiating Holders in writing that marketing factors require a limitation on the number of shares to be underwritten, the Initiating Holders shall so advise all Holders and Other Holders whose securities
would otherwise be underwritten pursuant hereto, and the number of shares of Registrable Securities that may be included in the registration and underwriting shall be allocated among all Holders in proportion, as nearly as practicable, to the
respective amounts of Registrable Securities which they had requested to be included in such registration and underwriting at the time of filing the registration statement, and to the extent that additional shares may be included in the
underwriting, among all Other Holders requesting such inclusion in proportion, as nearly as practicable, to the respective amount of securities which they had requested to be included in such registration and underwriting. No Registrable Securities
or other securities excluded from the underwriting by reason of the Underwriter’s marketing limitations shall be included in such registration. If any Holder or Other Holder who has requested inclusion in such registration as provided herein
disapproves of the terms of the underwriting, such person may elect to withdraw therefrom by written notice to the Company, the Underwriter and the Initiating Holders. The securities so withdrawn shall also be withdrawn from registration. If the
Underwriter has not limited the number of Registrable Securities or other securities to be underwritten, the Company may include its securities for its own account in such registration if the Underwriter so agrees and if the number of Registrable
Securities which would otherwise have been included in such registration and underwriting will not thereby be limited. 

  
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 (c) The registration of Registrable Securities under this Section 8.2 shall
be at the Company’s expense, except that Holders and Other Holders participating in a registration pursuant hereto shall pay their pro rata brokerage or underwriting commissions or discounts relating to the sale owned by them; and the Company
shall also pay the fees and expenses of any one special counsel retained by such Holders or Other Holders and except that after the second demand registration under this Section 8.2 demand registrations shall be at the expense of the Holders
participating in the registration. 
 Initiating Holders who exercise a right to demand registration under this Section 8.2 may
withdraw the exercise and cause the Company either not to file or to withdraw the filing of the registration statement at anytime prior to the effectiveness of such statement, provided that: 

(i) If the exercise is so withdrawn prior to filing of the registration statement, then the withdrawal of the exercise
will not be deemed to have been the exercise of a demand registration right; 
 (ii) If effectiveness of the
registration statement is delayed by more than 90 days by the Company and the exercise is withdrawn prior to effectiveness of the registration statement, then the withdrawal of the exercise will not be deemed to have been the exercise of a demand
registration right; 
 (iii) Any withdrawals other than the withdrawals specified in (i) and
(ii) above shall be deemed to be a demand pursuant to Section 8.2 hereof. If the withdrawn demand registration right is not deemed to have been the exercise of a demand registration right, as provided in subparagraphs (i) and
(ii) above, then the withdrawing Holder shall pay or reimburse the legal, auditing and printing expenses reasonably incurred by the Company in connection with the attempted registration; but if the withdrawn demand registration right is deemed
to be an exercise as provided in subparagraph (iii) above, then the Company shall pay all expenses incurred by it in connection with the attempted registration if the Company would have been responsible for paying the expenses of preparation of
such registration statement. 
 8.3 Company Registration. If, at any time, the Company proposes to
register under the 1933 Act, or register or qualify under the laws of any state, any of its Common Stock or securities convertible into or exercisable for Common Stock, on a form under the 1933 Act permitting registration of secondary offerings, it
will each such time give written notice of its intention to do so to each of the Holders. In the case of the registration for the initial public offering of the Company’s stock, the Company will give the Holders at least 30 days prior written
notice of the proposed filing of the registration statement; and in the case of all subsequent registrations, the Company will give the Holders at least 20 days prior written notice of such proposed filing. If a Holder desires to participate in such
registration or qualification of Common Stock, or other securities, it shall notify the Company, within 20 days in the case of the initial registration and 15 days in the case of subsequent registrations, of the number of shares of Registrable
Securities which it desires to have so included. In the event the Company decides to proceed with such registration or qualification, the Company will, at its sole expense, use its best efforts to cause all such Registrable Securities to be
registered or qualified to permit the sale 

  
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thereof; provided, however, that if, in connection with the offering by the Company of Common Stock, or securities convertible into or exercisable for Common Stock, pursuant to a registration
under the 1933 Act, the underwriter thereof shall impose a limitation on the number of shares of the Company’s stock or securities which may be included in any such registration statement because, in its judgment, the inclusion of such shares
would materially and adversely affect such public offering, then the Company shall be obligated to include in such registration statement only such portion of the Registrable Securities requested to be registered under this Section 8 as the
underwriter permits; provided that all other securities other than those offered for the Company’s own account shall first be excluded from the registration statement and provided further that not more than 65% of the shares to be included in
such registration statement shall be shares to be sold by the Company except that the Company may include greater than 65% of the shares to be included in such registration to the extent the aggregate of all such shares to be included therein, after
allowing therein all securities offered other than by the Company, is less than the total number of shares permitted to be included by the underwriters. Such limitation will be imposed pro rata with respect to all Registrable Securities as to which
inclusion has been requested pursuant to this Section 8.3. The Company shall bear all of the expense of all registrations pursuant to this Section 8.3, except for the pro rata portion of brokerage or underwriters discounts or commissions relating to
the shares sold on behalf of the Holders or Other Holders and the fees and expenses of any one special counsel retained by such Holders or Other Holders. It shall not be deemed a default of this Agreement if any such underwriter shall
(a) establish a limitation on the number of shares allowed to participate in any public offering of the Company’s stock which are not being sold for the Company’s account (subject to the 65% limitation referred to above), or
(b) shall require the holders of the Company’s stock, other than the Company, to agree to refrain from selling their stock to members of the public for some reasonable period of time (no longer than 180 days) after the date on which the
Company’s stock is first offered to the public (so called lock-up provisions), or (c) shall establish any other reasonable limitations or restrictions applicable to the holders of the Company’s stock, as a condition to consummating
the public offering. 
 8.4 Registration on Form S-3. 

(a) Following the first offering of its securities by the Company pursuant to a registration under the 1933 Act, the
Company shall use its reasonable efforts to qualify for registration of its Common Stock under the 1933 Act on Form S-3 (or any successor form of similar tenor and effect). If the Company shall be able to satisfy the conditions for registration of
its Common Stock under the 1933 Act on Form S-3 (or any successor form of similar tenor and effect), then, in addition to other rights of the Holders hereunder, the Company will, upon written request of Holders seeking to register on Form S-3
Registrable Securities having an aggregate market value of at least $500,000, as expeditiously as possible, will use its reasonable best efforts to effect a registration under the 1933 Act on Form S-3 (or any successor form of similar tenor and
effect) of all Registrable Securities referred to in a request or notice given to the Company pursuant to this Section 8.4 and to effect any registration or qualifications of such Registrable Securities under any state law, and any listing of such
Registrable Securities with any securities exchange on which the Common Stock of the Company is then listed, which may be required to permit the sale or disposition of such Registrable Securities in the manner specified in such request or notices;
provided, however, that no more than once per year the Company may meet its obligations under this Section 8.4 by preparing its own registration of 

  
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securities on any applicable form under the 1933 Act, which registration becomes effective within 90 days after such request or notice and which registration includes all Registrable Securities
referred to in such request or notice. If Registrable Securities sold pursuant to this Section 8.4 are sold in an underwritten offering, the terms of the underwriting agreement with the underwriter shall be mutually satisfactory to the Company and
the Holders requesting registration hereunder. The Company shall not be required to effect more than two registrations pursuant to this Section 8.4 within any twelve month period. 

(b) The registration of Registrable Securities under this Section 8.4 shall be at the Company’s expense, except that
Holders participating in a registration pursuant hereto shall pay their pro rata brokerage or underwriting commissions or discounts relating to the sale of Common Stock owned by them and shall pay the fees and expenses of any one special counsel
retained by such Holders or Other Holder. 
 8.5 Rule 144 Requirements. Within 90 days following the first
offering of its securities by the Company pursuant to a registration under the 1933 Act, the Company shall become and shall thereafter, so long as is necessary to permit the Holders to sell stock pursuant to Rule 144 under the 1933 Act, or any
successor exemptive rule of similar tenor hereafter in effect (“Rule 144”), remain subject to the reporting requirement of either Section 13 or Section 15(d) of the Securities Exchange Act of 1934. At all times when the Company
is subject to such reporting requirements, the Company shall use its best efforts to file with the Securities and Exchange Commission such information as the Commission may require under either of said Sections, and shall exercise its best efforts
to take all action as may be required to fulfill the conditions to the availability of Rule 144 for sales of Common Stock of the Company. The Company shall furnish to each Holder, upon its reasonable request, a written statement executed by the
Company as to the steps it has taken to comply with the current public information requirement of Rule 144. 

8.6 Transfer Where Registration Not Required. Before transferring, without registration under the 1933 Act or any
state securities laws, any security bearing a legend pursuant to Section 8.5, the Holder thereof shall give written notice to the Company of its intention to do so, describing briefly the manner of the disposition to be made thereof. Promptly upon
receiving such written notice, the Company shall present copies thereof to its counsel and if, in the opinion of such counsel, the proposed disposition of such securities may be effected without registration or qualification thereof (under all
applicable Federal or state laws), the Company, as promptly as practicable, shall notify such Holder of such opinion, whereupon the Holder shall be entitled to dispose of such security in accordance with the terms of the notice delivered by it to
the Company. 
 8.7 Conversion Prior to Sale. Notwithstanding anything contained herein to the contrary,
the obligations of the Company under this Section 8 to effect any registration, qualification, notification, or approval shall be limited to Common Stock only. No Holder shall be required to convert shares of Preferred Stock to Common Stock prior to
requesting any such registration, qualification, notification, or approval, but any such security included therein shall be so converted no later than the date on which such Holder effects a sale thereof pursuant to such registration, qualification,
notification, or approval. 

  
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 8.8 Filing Services of the Company. In connection with any
registration, filings or sales effected under Section 8.2, 8.3 or 8.4 hereof, the Company will: 
 (a) Prepare
and file the registration statement and such amendments and supplements to the registration statement and the prospectus and/or offering circular used in connection therewith as may be necessary to keep the registration statement and/or notification
effective for a period of not less than one hundred and eighty (180) days, as may be necessary for the Holders whose Registrable Securities are registered thereunder to dispose thereof and to comply with the provisions of the 1933 Act and
applicable state securities laws with respect to the deposition of the securities covered by the registration statement and/or notification whenever such selling Holder shall dispose of such securities during such period; 

(b) Furnish to such selling Holder, if applicable, such reasonable number of copies of a prospectus or offering circular,
including a preliminary prospectus, in conformity with the requirements of the 1933 Act and regulations thereunder, as such selling Holder may reasonably request in order to facilitate the disposition of such securities; 

(c) Use its best efforts to register or qualify the securities covered by the registration statement under the securities
laws of such jurisdictions as such selling Holder shall reasonably request (to the extent required, in the opinion of counsel referred to in Section 8.6 and provided such filing is not unreasonably burdensome on the Company), and accomplish any and
all other acts which may be reasonably necessary or advisable to enable such selling Holder to consummate the disposition in such jurisdictions of the securities owned by it or him; provided, however that the Company shall not be required to qualify
as a foreign corporation in any such jurisdictions or escrow shares of its capital stock or file any general consent to service of process under the laws of any such jurisdiction; 

(d) Obtain: 
 (i) an opinion of counsel for the Company, dated the effective date of the registration statement, and 
 (ii) “comfort” letters signed by the Company’s independent public accountants who have examined and reported on the Company’s financial statements included in the registration
statement, to the extent permitted by the standards of the AICPA, covering substantially the same matters with respect to the registration statement (and the prospectus included therein) and (in the case of the accountants “comfort”
letters) with respect to events subsequent to the date of the financial statements, as are customarily covered in opinions of issuer’s counsel and in accountants, “comfort” letters delivered to the underwriters in underwritten public
offerings of securities, to the extent that the Company is required to deliver or cause the delivery of such opinion or “comfort” letters to the underwriters in an underwritten public offering of securities; 

(e) Permit each selling Holder or his or its counsel or other representatives to inspect and copy such corporate documents
and records as may reasonably be requested by them; 
 (f) Furnish to each selling Holder a copy of all documents
filed and all correspondence from or to the Securities and Exchange Commission in connection with any such offering; and 

  
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 (g) Indemnify each selling Holder, each officer and director of such Holder
and each person, if any, who controls such Holder, within the meaning of applicable Federal and state securities laws (the “Applicable Securities Laws”) against all losses, claims, damages, liabilities, and expenses (under the Applicable
Securities Laws, or common law or otherwise) resulting from any untrue statement or alleged untrue statement of a material fact contained in any registration statement or prospectus (and as amended or supplemented if the Company shall have furnished
to the selling Holder any amendments or supplements thereto) or resulting from any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading in light of the
circumstances under which they were made, except insofar as such losses, claims, damages, liabilities or expenses result from any untrue statement or omission contained in information furnished in writing to the Company by the Holder expressly for
use therein. If the offering pursuant to any registration statement provided for under Section 8.2, 8.3 or 8.4 is made by underwriters, the Company agrees to negotiate in good faith the terms of an underwriting agreement with such underwriters and,
to enter into such agreement once the terms thereof are agreed upon and, if required by such terms, to indemnify such underwriters and each person who controls such underwriters within the meaning of the Applicable Securities Laws in substantially
the same manner as hereinabove provided with respect to the indemnification of the selling Holder. In connection with any registration statement in which a Holder is participating, such Holder will furnish to the Company in writing such information
as shall be reasonably requested by the Company for use in any such registration statement or prospectus, will notify the Company as to any changes therein, and will indemnify the Company, its directors, its officers, and each person, if any, who
controls the Company within the meaning of the Applicable Securities Laws, and, if required by the terms of an agreement with such underwriters, such underwriters and each person who controls such underwriters within the meaning of the Applicable
Securities Laws, against any losses, claims, damages, liabilities, and expense resulting from any untrue statement or alleged untrue statement of a material fact or any omission or alleged omission of material fact required to be stated in the
registration statement or prospectus (or any amendment or supplement thereof) and necessary to make the statements therein not misleading in light of the circumstances under which they were made, but only to the extent that such untrue statement or
omission is contained in the information so furnished in writing by the Holder expressly for use therein. 
 (i)
In order to provide for just and equitable contribution to joint liability under the 1933 Act in any case in which either: 
 (1) Any Holder of Registrable Securities exercising rights under this Section 8, or any controlling person of any such person, make a claim for indemnification pursuant to this section but it is
judicially determined (by the entry of a final judgement or decree by a court of competent jurisdiction and the expiration of time to appeal or the denial of the last right of appeal) that such indemnification may not be enforced in such case
notwithstanding the fact that this subsection provides for indemnification in such case; or 
 (2) Contribution
under the 1933 Act may be required on the part of any such selling Holder or any such controlling person in circumstances for which indemnification is provided under this section; 

  
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 then, and in each such case, the Company and such selling Holder will contribute using a relative fault
standard, to the aggregate losses, claims, damages, or liabilities to which they may be subject (after contribution from others) in such proportion so that such selling Holder is responsible for the portion represented by the percentage that the
purchase price of its Common Stock bears to the public offering price of all such Common Stock offered by such registration statement, and the Company is responsible for the remaining portion. 

(ii) Notwithstanding anything to the contrary provided herein, (A) no selling Holder will be required to contribute
or indemnify any amount in excess of the net proceeds received by it from the sale of all such Common Stock offered by it pursuant to such registration statement, and (B) no person or entity guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the 1933 Act) will be entitled to contribution or indemnification from any person or entity who was not guilty of such fraudulent misrepresentation. 

(iii) Promptly after receipt by any party to this Agreement of notice of the commencement of any action, suit or
proceeding, such party will, if a claim for contributing in respect thereof is to be made against another party, notify the contributing party of the commencement thereof. The omission to so notify the contributing party will not relieve it from any
liability which it may have to any other party other than for contribution under the 1933 Act. In any case, if such action, suit or proceeding is brought against any party, and such party notifies a contributing party of the commencement thereof,
the contributing party will be entitled to participate therein with the notifying party and any other contributing party similarly notified. The Company shall not be liable for any settlement entered into by any Holder without the Company’s
consent. 
 8.9 Certain Limitation in Connection with Future Grants of Registration Rights. From and after
the date of this Agreement and while any Registrable Securities or securities issued upon conversion thereof remain outstanding, the Company shall not enter into any agreement with any holder or prospective holder of any securities of the Company
which grants to such holder registration rights with respect to any of the Company’s securities unless such agreement provides that: 
 (a) In the reasonable opinion of the Board of Directors of the Company, such rights are no more extensive or favorable to such purchasers than the demand and other registration rights granted to the
Holders; 
 (b) The Holders shall have the right to participate in registrations pursuant to the exercise of such
rights on a pro rata basis; and 
 (c) Such rights relate only to Common Stock of the Company. 

  
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 8.10 Transfer of Registration Rights. Subject to the first paragraph
of this Section 8, the registration rights of a Holder under this Section 8 may be transferred to any Qualified Buyer or Permitted Transferee and to any transferee who is an affiliate of Messrs. Molvig and Iannucci (including without limitation any
partner of any investor which is a partnership or any estate or trust of which any Investor which is an individual is the grantor) provided, however, that the Company is given written notice by the Holder at the times of such transfer stating the
name and address of the transferee and identifying the securities with respect to which the rights under this Section 8 are being transferred. 
 8.11 Exchange Act Registration. If the Company at any time shall list any Common Stock on any national securities exchange and shall register such Common Stock under the Securities Exchange Act of
1934 the Company will, at its expense, simultaneously list on such exchange and maintain such listing of, all of the shares of Common Stock included in the definition of Registrable Securities. 

8.12 Damages. The Company recognizes and agrees that the selling Holders will not have an adequate remedy if the
Company fails to comply with this Section 8 and that damages will not be readily ascertainable, and the Company expressly agrees that, in the event of such failure, it shall not oppose an application by such selling Holder or any other person
entitled to the benefits of this Section 8 requiring specific performances of any and all provisions hereof or enjoining the Company from continuing to commit any such breach of this Section 8. 

8.13 Termination of Registration Rights. The provisions of this Section 8 shall terminate on the fifth anniversary
of the Company’s first Qualified Public Offering. 
 9. Miscellaneous. 

9.1 Transfers of Certain Rights. Except as otherwise provided for in Section 8 hereof, the rights granted to an
Investor in this Agreement may be transferred by the Investor to a Qualified Buyer or a Permitted Transferee, and by such transferee to a subsequent Qualified Buyer or Permitted Transferee. Any Permitted Transferee or Qualified Buyer to whom rights
under this Agreement are transferred shall (a) as a condition to such transfer, deliver to the Company a written instrument by which such Permitted Transferee or Qualified Buyer agrees to be bound by the obligations imposed upon the Investor
under this Agreement to the same extent as if she, he or it were an Investor under this Agreement and (b) be deemed to be an investor hereunder. 
 9.2 Survival of Representations. The representations and warranties made herein or in any certificates or documents executed in connection herewith shall survive any investigation made by an
Investor and the Closing for a period of one year from the date hereof; and all written statements contained in any certificate or other document delivered by the Company hereunder or in connection herewith shall be deemed to constitute
representations and warranties made by the Company herein 
 9.3 Incorporation by Reference. All exhibits
and schedules appended to this Agreement are herein incorporated by reference and made a part hereof. 
 9.4
Parties in Interest. All covenants, agreements, representations, warranties and undertakings in this Agreement made by and on behalf of any of the parties hereto shall bind and inure to the benefit of the respective successors and assigns of
the parties hereto whether so expressed or not. 

  
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 9.5 Amendments and Waivers. Except as set forth in this Agreement,
changes in or additions to this Agreement may be made or compliance with any term, covenant, agreement, condition or provision set forth herein may be omitted or waived (either generally or in a particular instance and either retroactively or
prospectively), or representatives to act on behalf of the holders of all of the Series H Notes or Note Shares may be designated, upon the written consent of the Company and the holders of seventy percent (70%) of the aggregate amount of the
shares that would be issued upon conversion of the Series H Notes (as if converted on the date of the consent), the Note Shares and the Conversion Shares then outstanding except that changes to the provisions of Section 8 and the portion of this
sentence relating to Section 8 shall be made only upon written approval of holders of a majority of the shares of Series A Preferred Stock and Series B Preferred Stock and sixty-seven percent (67%) of the Registerable Securities including at
least two Institutional Holders (as defined below). For purposes of this Section 9.5, the term Institutional Holders shall mean Fidelity, BCV, Edelson and MCRC. 
 9.6 Governing Law. This Agreement shall be deemed a contract made under the internal laws of The Commonwealth of Massachusetts and, together with the rights of obligations of the parties hereunder,
shall be construed under and governed by the laws of such Commonwealth. 
 9.7 Notices. All notices,
requests, consents and demands shall be in writing and shall be personally delivered, mailed, postage prepaid, telecopied or telegraphed, to the Company at: 
 Exa Corporation 
 450 Bedford Street 

Lexington, Massachusetts 02173 
 Attn: Stephen Remondi 
 with a copy to: 

John D. Patterson, Jr., Esq. 
 Foley Hoag LLP 
 155 Seaport Boulevard 

Boston, Massachusetts 02210 
 or to the Investors at the addresses set forth on Exhibit A 
 if to BCV,
with a copy to: 
 Paul McDermott, Esq. 
 Testa, Hurwitz & Thibeault, LLP 
 125 High Street 

Boston, MA 02110 

  
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 if to Fidelity, with a copy to: 

John Hitt, Esq. 

FMR Corporation 

82 Devonshire Street 
 Boston, MA 02109-3614 
 or such other address as may be furnished in writing to the other parties
hereto. All such notices, requests, demands and other communication shall, when mailed (registered or certified mail, return receipt requested, postage prepaid), personally delivered, or telegraphed, be effective four days after deposit in the
mails, when personally delivered, or when delivered to the telegraph company, respectively, addressed as aforesaid, unless otherwise provided herein and, when telecopied, shall be effective upon actual receipt. 

9.8 Meaning of Share Numbers. Whenever this Agreement refers to a particular number of shares of capital stock of
the Company of any class or series, such number shall be equitably adjusted in the event that after the date hereof the outstanding shares of such class or series shall be (i) increased by way of stock issued as a dividend for no consideration,
(ii) subdivided (by stock split or otherwise) into a greater number of shares or (iii) combined or consolidated, by reclassification or otherwise, into a lesser number of shares. 

9.9 Effect of Headings. The section and paragraph headings herein are for convenience only and shall not affect the
construction hereof. 
 9.10 Entire Agreement. This Agreement and the Exhibits and Schedules hereto
together with any other Agreement referred to herein (the “Additional Agreements”) constitute the entire agreement among the Company and the Investors with respect to the subject matter hereof. There are no representations, warranties,
covenants or undertakings with respect to the subject matter hereof other than those expressly set forth herein. This Agreement and such Additional Agreements supersede all prior agreements between the parties with respect to the shares purchased
hereunder and the subject matter hereof. 
 9.11 Severability. The invalidity or unenforceability of any
provision hereof shall in no way affect the validity or enforceability of any other provision. 
 9.12
Counterparts. This Agreement may be executed in counterparts, all of which together shall constitute one and the same instrument. 

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

									
	EXA CORPORATION	 		 	FIDELITY VENTURES LIMITED
					
	By:	 	/s/ Stephen Remondi	 		 	By:	 	 /s/ Robert Lawrence

	Its:	 	President and CEO	 		 	Its:	 	 
			
	EDELSON TECHNOLOGY PARTNERS	 		 	BOSTON CAPITAL VENTURES III, LIMITED PARTNERSHIP
					
	By:	 	/s/ Harry Edelson	 		 	By:	 	/s/ [ILLEGIBLE]
	Its:	 	G.P.	 		 	Its:	 	 
			
	FMR CORPORATION	 		 	BOSTON CAPITAL VENTURES IV, LIMITED PARTNERSHIP
					
	By:	 	/s/ [ILLEGIBLE]	 		 	By:	 	/s/ [ILLEGIBLE]
	Its:	 	Treasurer	 		 	Its:	 	 


  
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 EXHIBIT A 
 BRIDGE NOTES 
  

																									
	 Existing Investor
	  	Date of Loan	 	  	Principal Amount
of Note	 	  	Aggregate Total Due
on Notes prior to
Exercise of Series G
Warrants* (Principal
and
Interest)	 	  	Total Amount
Converted to
Series H Notes*	 	  	Total Amount
Converted to 5
Year Notes*	 	  	Total Amount used to
Purchase Series G
Shares	 
	 FMR Corporation
	  	 	5/19/99	  	  	$	103,315.28	  	  				  				  				  			
		  	 	FMR Total Loaned	  	  	$	103,315.28	  	  	$	155,785.16	  	  	$	145,453.66	  	  	$	0	  	  	$
  
	10,331.50

103,315 shares
	  
   

	 Fidelity Ventures Limited
	  	 	5/19/99	  	  	$	312,362.64	  	  				  				  				  			
		  	 	3/12/99	  	  	$	100,000	  	  				  				  				  			
		  	 	5/4/99	  	  	$	200,000	  	  				  				  				  			
		  	 	11/14/00	  	  	$	95,000	  	  				  				  				  			
		  	 	11/14/00	  	  	$	1,063,883.37	  	  				  				  				  			
	 Fidelity Ventures Ltd. Total Loaned
	  				  	$	1,771,246.01	  	  	$	2,457,997.08	  	  	$	2,280,872.48	  	  	$	0	  	  	$
  
	177,124.60
 1,771,246 shares
	  
   

	 BCV IV Limited Partnership
	  	 	5/7/99	  	  	$	100,000	  	  				  				  				  			
		  	 	5/19/99	  	  	$	104,065.93	  	  				  				  				  			
		  	 	5/19/99	  	  	$	1,100,000	  	  				  				  				  			
		  	 	10/19/99	  	  	$	250,000	  	  				  				  				  			
		  	 	11/8/99	  	  	$	250,000	  	  				  				  				  			
		  	 	6/26/00	  	  	$	400,000	  	  				  				  				  			
		  	 	10/12/00	  	  	$	200,000	  	  				  				  				  			
		  	 	BCV IV Total Loaned	  	  	$	2,404,065.93	  	  	$	3,504,491.57	  	  	$	2,096,012.67	  	  	$	1,168,072.30	  	  	$
  
	240,406.60
 2,404,066 shares
	  
   

	 BCV III Limited Partnership
	  	 	5/19/99	  	  	$	103,461.54	  	  				  				  				  			
		  	 	10/20/00	  	  	$	300,000	  	  				  				  				  			
		  	 	BCV III Total Loaned	  	  	$	403,461.54	  	  	$	554,737.77	  	  	$	330,313.47	  	  	$	184,078.10	  	  	$
  
	40,346.20
 403,462 shares
	  
   

	 Edelson Technology Partners
	  	 	6/15/99	  	  	$	125,000	  	  				  				  				  			
		  	 	Edelson Total Loaned	  	  	$	125,000	  	  	$	187,246.36	  	  	$	174,746.36	  	  	$	0	  	  	$
  
	12,500.00
 125,000 shares
	  
   

		  				  	 	 	 	  	 	 	 	  	 	 	 	  	 	 	 	  	 	 	 
	 TOTAL:
	  				  	$	4,807,088.76	  	  	$	6,860,257.94	  	  	$	5,027,398.64	  	  	$	1,352,150.40	  	  	$
  
	480,708.90

4,807,089 shares
	  
   









 EXHIBIT B 
 THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933 OR REGISTERED OR QUALIFIED UNDER ANY STATE SECURITIES LAWS.
IT MAY NOT BE SOLD, OFFERED FOR SALE, PLEDGED OR HYPOTHECATED, OTHER
THAN PURSUANT TO THE TERMS OF A CERTAIN NOTE PURCHASE AGREEMENT
BETWEEN THE HOLDER AND THE COMPANY (THE “NOTE PURCHASE AGREEMENT”) OF
EVEN DATE HEREWITH, IN THE ABSENCE OF A REGISTRATION STATEMENT IN
EFFECT WITH RESPECT TO THE NOTE AND THE SECURITIES ISSUED UPON
CONVERSION OF THIS NOTE UNDER SUCH ACT AND REGISTRATION OR QUALIFICATION
UNDER APPLICABLE STATE SECURITIES LAWS OR AN OPINION OF COUNSEL, IF
REQUIRED, SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION OR QUALIFICATION IS
NOT REQUIRED. FURTHERMORE, THIS NOTE AND THE SECURITIES ISSUABLE UPON CONVERSION
OF THIS NOTE ARE SUBJECT TO THE NOTE PURCHASE AGREEMENT, A COPY
OF WHICH IS ON FILE AT THE COMPANY’S OFFICES. 

CONVERTIBLE PROMISSORY NOTE 
  

			
	$            	  	February 9, 2004

 Lexington, Massachusetts 
 FOR VALUE RECEIVED, Exa Corporation (the “Company”), a Delaware corporation, hereby promises to pay to the order of
                                         
    or its assignee (the “Payee”), at the offices of the Payee at
                                         
                or such other address as the Payee shall designate in a written notice to the Company, the principal amount of
$            , and to pay interest (calculated on the basis of a 365 day year and the actual number of days elapsed in any period) on such principal amount at the rate of 10%,
compounded annually. Interest shall be deemed to have accrued on this convertible promissory note starting on December 18, 2003. 
 This convertible promissory note is one of a series of convertible promissory notes issued by the Company on the date hereof (collectively, the “Series H Notes”). The principal and interest
shall be due and payable on December 18, 2008. Notwithstanding the foregoing, Payee acknowledges and agrees that payment of the outstanding principal and interest of this Note is subordinated in all respects to payment in full of the
outstanding principal and interest on certain non-convertible notes of even date herewith (the “Non-Convertible Notes”) and Payee hereby postpones and subordinates all payments under this Note to the full, final and indefeasible payment
and discharge of all of the Non-Convertible Notes, in cash; provided, however, that the Company may pay accrued interest due from time to time on a pro rata basis on all Series H Notes so long as the Company is not in default in the payment of any
principal due on the Non-Convertible Notes and also pays accrued interest due on the Non-Convertible Notes on the same priority basis. 
 Without limiting the generality of the foregoing, in the event of any distribution, division or application, partial or complete, voluntary or involuntary, by operation of law or otherwise, of all or any
part of the assets of the Company or the proceeds thereof to creditors of the Company or upon any indebtedness of the Company, by reason of the liquidation, dissolution or other winding up of the Company or the Company’s business, or in the
event of any sale, receivership, insolvency or bankruptcy proceeding, or assignment for the benefit of creditors, or any proceeding by or against the Company for any relief under any bankruptcy or insolvency law or








 
laws relating to the relief of debtors, readjustment of indebtedness, reorganization, compositions or extensions, then and in any such event any payment or distribution of any kind or character,
either in cash, securities or other property, which shall be payable or deliverable upon or with respect to this Note shall be paid or delivered directly to the holders of the Non-Convertible Notes for application to the payment of such Notes
(whether or not the same is then due) until all of the Non-Convertible Notes have been fully and indefeasibly paid, in cash, and discharged. 
 At the election of the Payee, the outstanding principal and accrued interest, or any part thereof, may be converted at any time into Series H Preferred Stock of the Corporation at a price of $.25 per
share (the “Conversion Price”). If the Payee desires to convert some or all of the principal and accrued interest into Series H Preferred Stock, it shall inform the Corporation in writing and surrender this Note for cancellation. The
Corporation shall then issue the Payee a certificate for the applicable number of shares of Series H Preferred Stock and, if applicable, a new note in the same form as this Note with respect to the remaining outstanding principal. The dollar amount
to be converted and applied towards the aggregate Conversion Price shall be a whole number multiple of the Conversion Price per share, no fractional shares of Series H Preferred Stock will be issued and the Company shall make a cash payment to the
Payee for the amount of principal and accrued interest remaining due to the Payee after any such conversion. 
 Upon any
subdivision or combination of outstanding shares of Series H Preferred Stock or the payment of any dividend in shares of Series H Preferred Stock or the issuance of shares of Series H Preferred Stock without consideration, the Conversion Price shall
thereupon be proportionately decreased or increased. 
 The outstanding principal and accrued interest under this Note will
automatically convert into Series H Preferred Stock of the Corporation at the Conversion Price upon the occurrence of a Conversion Event. A “Conversion Event” means the closing of an underwritten public offering of equity securities of the
Corporation with aggregate proceeds to the Company of at least $25,000,000 or upon a consolidation or merger of the Corporation with or into another entity or entities where the holders of the Company’s equity before the transaction own less
than 50% of the voting power of all voting equity after the transaction, or a sale, lease, abandonment, transfer or other disposition of all or substantially all of the Corporation’s assets. The Corporation shall give the Payee prompt written
notice of the occurrence of the Conversion Event containing the date on which the Conversion Event will occur, the amount of principal and interest to be converted and the number of shares of Series H Preferred Stock the Payee will acquire
therewith. The Corporation shall then issue the Payee a certificate for the applicable number of shares of Series H Preferred Stock. The dollar amount to be converted and applied towards the aggregate Conversion Price shall be a whole number
multiple of the Conversion Price per share and no fractional shares of Series H Preferred Stock will be issued. 
 Nothing
contained in this Note shall be deemed to establish or require the payment of a rate of interest in excess of the amount legally enforceable. In the event that the rate of interest so required to be paid exceeds the maximum rate legally enforceable,
the rate of interest so required to be paid shall be automatically reduced to the maximum rate legally enforceable, and any excess paid over such maximum enforceable rate shall be automatically credited on account of the principal hereof without
premium or penalty. 

  
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 The occurrence of any one or more of the following events of default shall constitute a
default under this Note: (a) any failure by the Company to make any payment of principal or interest as provided herein; (b) any failure by the Company to perform or observe fully the terms and obligations of this Note; or (c) the
insolvency or termination of the business of the Company, assignment for the benefit of creditors by the Company, the commencement of any proceeding under any bankruptcy or insolvency laws by or against the Company, or the appointment of a receiver
or trustee to take possession of any property of the Company. In the event of any default under this Note and at any time thereafter during the continuance of the default, all amounts then outstanding under the Note shall become immediately due and
payable. The Payee shall have the immediate right to pursue all remedies provided by law, together with all rights provided in this Note. The Company shall pay the collection expenses incurred by Payee in enforcing its rights under this Note with no
right of set off for any counterclaims brought by the Company. 
 Notices to the Company shall be by telegram, facsimile, telex,
delivery in hand or by courier, or registered or certified mail (return receipt requested) and shall be deemed to have been given or made when telegraphed, faxed (and confirmed received), telexed, delivered in hand or by courier, or three days after
being deposited in the United States mails postage prepaid, registered or certified, return receipt requested, to the Company at 450 Bedford Street, Lexington, Massachusetts 02173, marked “Attention: President”, fax number
(781) 676-8599 or at such other address specified by the Company in accordance herewith to the holder. 
 No delay or
omission on the part of the Payee in exercising any right hereunder shall operate as a waiver of such right or of any other right of the Payee, nor shall any delay, omission or waiver on any one occasion be deemed a bar to or waiver of the same or
any other right on any future occasion. Every maker, endorser and guarantor of this Note or the obligations represented hereby waives presentment, demand, notice, protest and all other demands and notices in connection with the delivery, acceptance,
performance, default or enforcement of this Note, assents to any extension or postponement of the time of payment or any other indulgence, to any substitution, exchange or release of collateral and to the addition or release of any other party or
person primarily or secondarily liable. 
 REMAINDER OF PAGE INTENTIONAL LEFT BLANK 

SIGNATURE PAGE TO FOLLOW 

  
 - 34 -









 IN WITNESS WHEREOF, the undersigned has executed this Note as an instrument under seal, as
of the date first above written. 
  

			
	EXA CORPORATION
		
	By:	 	 
	Title:	 	 



  
 - 35 -









 EXHIBIT C 
 PROMISSORY NOTE 
  

			
	$            	  	February 9, 2004

 Lexington, Massachusetts 
 FOR VALUE RECEIVED, Exa Corporation (the “Company”), a Delaware corporation, hereby promises to pay to the order of
                                         
                    or its assignee (the “Payee”), at the offices of the Payee at
                                         
                    or such other address as the Payee shall designate in a written notice to the Company, the principal amount of
$            , and to pay interest (calculated on the basis of a 365 day year and the actual number of days elapsed in any period) in arrears on such principal amount at the rate of
10%, compounded annually. Interest shall be deemed to have accrued on this promissory note starting on December 18, 2003. 

This promissory note is one of a series of promissory notes issued by the Company on the date hereof (collectively, the
“Non-Convertible Notes”). The principal and interest shall be due and payable on December 18, 2008. This Note shall be senior to the Convertible Promissory Notes convertible into shares of Series H Preferred Stock issued to FMR
Corporation, Fidelity Ventures Limited, Edelson Technology Partners, Boston Capital Ventures             , Limited Partnership and the Payee by the Company on the date hereof (the
“Series H Notes”). The Company may pay accrued interest due from time to time on a pro rata basis on all Non-Convertible Notes. 
 Nothing contained in this Note shall be deemed to establish or require the payment of a rate of interest in excess of the amount legally enforceable. In the event that the rate of interest so required to
be paid exceeds the maximum rate legally enforceable, the rate of interest so required to be paid shall be automatically reduced to the maximum rate legally enforceable, and any excess paid over such maximum enforceable rate shall be automatically
credited on account of the principal hereof without premium or penalty. 
 The occurrence of any one or more of the following
events of default shall constitute a default under this Note: (a) any failure by the Company to make any payment of principal or interest as provided herein; (b) any failure by the Company to perform or observe fully the terms and
obligations of this Note; or (c) the insolvency or termination of the business of the Company, assignment for the benefit of creditors by the Company, the commencement of any proceeding under any bankruptcy or insolvency laws by or against the
Company, or the appointment of a receiver or trustee to take possession of any property of the Company. In the event of any default under this Note and at any time thereafter during the continuance of the default, all amounts then outstanding under
the Note shall become immediately due and payable. The Payee shall have the immediate right to pursue all remedies provided by law, together with all rights provided in this Note. The Company shall pay the collection expenses incurred by Payee in
enforcing its rights under this Note with no right of set off for any counterclaims brought by the Company. 







 Notices to the Company shall be by telegram, facsimile, telex, delivery in hand or by
courier, or registered or certified mail (return receipt requested) and shall be deemed to have been given or made when telegraphed, faxed (and confirmed received), telexed, delivered in hand or by courier, or three days after being deposited in the
United States mails postage prepaid, registered or certified, return receipt requested, to the Company at 450 Bedford Street, Lexington, Massachusetts 02173, marked “Attention: President”, fax number (781) 676-8599 or at such other
address specified by the Company in accordance herewith to the holder. 
 No delay or omission on the part of the Payee in
exercising any right hereunder shall operate as a waiver of such right or of any other right of the Payee, nor shall any delay, omission or waiver on any one occasion be deemed a bar to or waiver of the same or any other right on any future
occasion. Every maker, endorser and guarantor of this Note or the obligations represented hereby waives presentment, demand, notice, protest and all other demands and notices in connection with the delivery, acceptance, performance, default or
enforcement of this Note, assents to any extension or postponement of the time of payment or any other indulgence, to any substitution, exchange or release of collateral and to the addition or release of any other party or person primarily or
secondarily liable. 
 REMAINDER OF PAGE INTENTIONAL LEFT BLANK 

SIGNATURE PAGE TO FOLLOW 

  
 37 









 IN WITNESS WHEREOF, the undersigned has executed this Note as an instrument under seal, as
of the date first above written. 
  

			
	EXA CORPORATION
		
	By:	 	 
	Title:	 	 



  
 38