Document:

EX-10.4

 Exhibit 10.4 

CANDEL THERAPEUTICS, INC. 

2021 EMPLOYEE STOCK PURCHASE PLAN 

The purpose of the Candel Therapeutics, Inc. 2021 Employee Stock Purchase Plan (the “Plan”) is to provide eligible employees of
Candel Therapeutics, Inc. (the “Company”) and each Designated Subsidiary (as defined in Section 11) with opportunities to purchase shares of the Company’s common stock, par value $0.01 per share (the “Common Stock”). An
aggregate of 293,000 shares of Common Stock have been approved and reserved for this purpose, plus on January 1, 2022, and each January 1 thereafter through January 1, 2031 the number of shares of Common Stock reserved and available
for issuance under the Plan shall be cumulatively increased by the least of (i) 293,000 shares of Common Stock, (ii) one percent (1%) of the number of shares of Common Stock issued and outstanding on the immediately preceding December 31st, or
(iii) such number of shares of Common Stock as determined by the Administrator (as defined in Section 1). 
 The Plan includes two
components: a Code Section 423 Component (the “423 Component”) and a non-Code Section 423 Component (the “Non-423 Component”). It is
intended for the 423 Component to constitute an “employee stock purchase plan” within the meaning of Section 423(b) of the U.S. Internal Revenue Code of 1986, as amended (the “Code”), and the 423 Component shall be
interpreted in accordance with that intent. Under the Non-423 Component, which does not qualify as an “employee stock purchase plan” within the meaning of Section 423(b) of the Code, options
will be granted pursuant to rules, procedures or sub-plans adopted by the Administrator designed to achieve tax, securities laws or other objectives for eligible employees. Except as otherwise provided herein,
the Non-423 Component will operate and be administered in the same manner as the 423 Component. 

 Unless otherwise defined herein, capitalized terms in this Plan shall have the meaning
ascribed to them in Section 11. 
 1.    Administration. The Plan will be administered by the person or
persons (the “Administrator”) appointed by the Company’s Board of Directors (the “Board”) for such purpose. The Administrator has authority at any time to: (i) adopt, alter and repeal such rules, guidelines and
practices for the administration of the Plan and for its own acts and proceedings as it shall deem advisable; (ii) interpret the terms and provisions of the Plan; (iii) make all determinations it deems advisable for the administration of
the Plan; (iv) decide all disputes arising in connection with the Plan; and (v) otherwise supervise the administration of the Plan. All interpretations and decisions of the Administrator shall be binding on all persons, including the
Company and the Participants. No member of the Board or individual exercising administrative authority with respect to the Plan shall be liable for any action or determination made in good faith with respect to the Plan or any option granted
hereunder. 
 2.    Offerings. The Company may make one or more offerings to eligible employees to purchase
Common Stock under the Plan (“Offerings”). Unless otherwise determined by the Administrator, the initial Offering will begin and end on the dates to be determined by the Administrator. Thereafter, unless otherwise determined by the
Administrator, an Offering will begin on the first business day occurring on or after each May 1 and November 1 and will end on the last business day occurring on or before the following October 31 and April 30, respectively. The
Administrator may, in its discretion, designate a different period for any Offering, provided that no Offering shall exceed 27 months in duration or overlap any other Offering. 

3.    Eligibility. All individuals classified as employees on the payroll records of the Company and each
Designated Subsidiary are eligible to participate in any one or more of the 

  
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Offerings under the Plan, provided that as of the first day of the applicable Offering (the “Offering Date”) they are customarily employed by the Company or a Designated Subsidiary for
more than 20 hours a week (or such lesser number of hours per week as the Administrator shall determine in advance of an Offering) and have completed such period of service prior to the Offering Date as the Administrator may require (but in no event
will the required period of continuous employment be equal to or greater than two years). Notwithstanding any other provision herein, individuals who are not contemporaneously classified as employees of the Company or a Designated Subsidiary for
purposes of the Company’s or applicable Designated Subsidiary’s payroll system are not considered to be eligible employees of the Company or any Designated Subsidiary and shall not be eligible to participate in the Plan. In the event any
such individuals are reclassified as employees of the Company or a Designated Subsidiary for any purpose, including, without limitation, common law or statutory employees, by any action of any third party, including, without limitation, any
government agency, or as a result of any private lawsuit, action or administrative proceeding, such individuals shall, notwithstanding such reclassification, remain ineligible for participation. Notwithstanding the foregoing, the exclusive means for
individuals who are not contemporaneously classified as employees of the Company or a Designated Subsidiary on the Company’s or Designated Subsidiary’s payroll system to become eligible to participate in this Plan is through an amendment
to this Plan, duly executed by the Company, which specifically renders such individuals eligible to participate herein. 

4.    Participation. 

(a)    Participants. An eligible employee who is not a Participant in any prior Offering may participate in a
subsequent Offering by submitting an enrollment form to his or her appropriate payroll location at least 15 business days before the Offering Date (or by such other deadline as shall be established by the Administrator for the Offering). 

  
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 (b)    Enrollment. The enrollment form will (a) state a
whole percentage or amount to be deducted from an eligible employee’s Compensation (as defined in Section 11) per pay period, (b) authorize the purchase of Common Stock in each Offering in accordance with the terms of the Plan and
(c) specify the exact name or names in which shares of Common Stock purchased for such individual are to be issued pursuant to Section 10. An employee who does not enroll in accordance with these procedures will be deemed to have waived
the right to participate. Unless a Participant files a new enrollment form or withdraws from the Plan, such Participant’s deductions and purchases will continue at the same percentage of Compensation for future Offerings, provided he or she
remains eligible. 
 (c)    Notwithstanding the foregoing, participation in the Plan will neither be permitted nor be
denied contrary to the requirements of the Code. 
 5.    Employee Contributions. Each eligible employee may
authorize payroll deductions at a minimum of one percent (1%) up to a maximum of fifteen percent (15%) of such employee’s Compensation for each pay period. The Company will maintain book accounts showing the amount of payroll deductions made by
each Participant for each Offering. No interest will accrue or be paid on payroll deductions. 
 6.    Deduction
Changes. Except as may be determined by the Administrator in advance of an Offering, a Participant may not increase or decrease his or her payroll deduction during any Offering, but may increase or decrease his or her payroll deduction with
respect to the next Offering (subject to the limitations of Section 5) by filing a new enrollment form at least fifteen (15) business days before the next Offering Date (or by such other deadline as shall be

  
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established by the Administrator for the Offering). The Administrator may, in advance of any Offering, establish rules permitting a Participant to increase, decrease or terminate his or her
payroll deduction during an Offering. 
 7.    Withdrawal. A Participant may withdraw from participation in the
Plan by delivering a written notice of withdrawal to his or her appropriate payroll location. The Participant’s withdrawal will be effective as of the next business day. Following a Participant’s withdrawal, the Company will promptly
refund such individual’s entire account balance under the Plan to him or her (after payment for any Common Stock purchased before the effective date of withdrawal). Partial withdrawals are not permitted. Such an employee may not begin
participation again during the remainder of the Offering, but may enroll in a subsequent Offering in accordance with Section 4. 

8.    Grant of Options. On each Offering Date, the Company will grant to each eligible employee who is then a
Participant in the Plan an option (“Option”) to purchase on the last day of such Offering (the “Exercise Date”), at the Option Price hereinafter provided for, the lowest of (a) a number of shares of Common Stock determined
by dividing such Participant’s accumulated payroll deductions on such Exercise Date by the Option Price (as defined herein), (b) the number of shares determined by dividing $25,000 by the Fair Market Value of the Common Stock on the
Offering Date for such Offering; or (c) such other lesser maximum number of shares as shall have been established by the Administrator in advance of the Offering; provided, however, that such Option shall be subject to the limitations set forth
below. Each Participant’s Option shall be exercisable only to the extent of such Participant’s accumulated payroll deductions on the Exercise Date. The purchase price for each share purchased under each Option (the “Option
Price”) will be eighty-five percent (85%) of the Fair Market Value of the Common Stock on the Offering Date or the Exercise Date, whichever is less. 

  
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 Notwithstanding the foregoing, no Participant may be granted an option hereunder if such
Participant, immediately after the option was granted, would be treated as owning stock possessing five percent (5%) or more of the total combined voting power or value of all classes of stock of the Company or any Parent or Subsidiary (as
defined in Section 11). For purposes of the preceding sentence, the attribution rules of Section 424(d) of the Code shall apply in determining the stock ownership of a Participant, and all stock which the Participant has a contractual
right to purchase shall be treated as stock owned by the Participant. In addition, no Participant may be granted an Option which permits such Participant rights to purchase stock under the Plan, and any other employee stock purchase plan of the
Company and its Parents and Subsidiaries, to accrue at a rate which exceeds $25,000 of the fair market value of such stock (determined on the option grant date or dates) for each calendar year in which the Option is outstanding at any time. The
purpose of the limitation in the preceding sentence is to comply with Section 423(b)(8) of the Code and shall be applied taking Options into account in the order in which they were granted. 

9.    Exercise of Option and Purchase of Shares. Each employee who continues to be a Participant in the Plan on the
Exercise Date shall be deemed to have exercised his or her Option on such date and shall acquire from the Company such number of whole shares of Common Stock reserved for the purpose of the Plan as his or her accumulated payroll deductions on such
date will purchase at the Option Price, subject to any other limitations contained in the Plan. Any amount remaining in a Participant’s account at the end of an Offering solely by reason of the inability to purchase a fractional share will be
carried forward to the next Offering; any other balance remaining in a Participant’s account at the end of an Offering will be refunded to the Participant promptly. 

  
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 10.    Issuance of Certificates. Certificates or book-entries at
the Company’s transfer agent representing shares of Common Stock purchased under the Plan may be issued only in the name of the employee, in the name of the employee and another person of legal age as joint tenants with rights of survivorship,
or in the name of a broker authorized by the employee to be his, her or their nominee for such purpose. 

11.    Definitions. 

The term “Compensation” means the regular or basic rate of compensation. The Administrator, in its discretion, may establish a
different definition of Compensation for an Offering, which for the Section 423 Component shall apply on a uniform and nondiscriminatory basis. Further, the Administrator will have discretion to determine the application of this definition to
eligible employees outside the United States. 
 The term “Designated Subsidiary” means any present or future Subsidiary (as
defined below) that has been designated by the Board to participate in the Plan. The Board may so designate any Subsidiary, or revoke any such designation, at any time and from time to time, either before or after the Plan is approved by the
stockholders, and may further designate such companies or Participants as participating in the 423 Component or the Non-423 Component. The Board may also determine which Subsidiaries or eligible employees may
be excluded from participation in the Plan, to the extent consistent with Section 423 of the Code or as implemented under the Non-423 Component, and determine which Designated Subsidiary or Subsidiaries
will participate in separate Offerings (to the extent that the Company makes separate Offerings). For purposes of the 423 Component, only the Company and its Subsidiaries may be Designated 

  
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Subsidiaries; provided, however, that at any given time, a Subsidiary that is a Designated Subsidiary under the 423 Component will not be a Designated Subsidiary under the Non-423 Component. The current list of Designated Subsidiaries is attached hereto as Appendix A. 
 The
term “Fair Market Value of the Common Stock” on any given date means the fair market value of the Common Stock determined in good faith by the Administrator; provided, however, that if the Common Stock is admitted to quotation on the
National Association of Securities Dealers Automated Quotation System (“NASDAQ”), the NASDAQ Global Market, The New York Stock Exchange or another national securities exchange, the determination shall be made by reference to the closing
price on such date. If there is no closing price for such date, the determination shall be made by reference to the last date preceding such date for which there is a closing price. Notwithstanding the foregoing, if the date for which Fair Market
Value of the Common Stock is determined is the Registration Date, the Fair Market Value of the Common Stock shall be the “Price to the Public” (or equivalent) set forth on the cover page for the final prospectus relating to the
Company’s Initial Public Offering. 
 The term “Parent” means a “parent corporation” with respect to the Company,
as defined in Section 424(e) of the Code. 
 The term “Participant” means an individual who is eligible as determined in
Section 3 and who has complied with the provisions of Section 4. 
 The term “Subsidiary” means a “subsidiary
corporation” with respect to the Company, as defined in Section 424(f) of the Code. 
 12.    Rights on
Termination of Employment. If a Participant’s employment terminates for any reason before the Exercise Date for any Offering, no payroll deduction will be taken 

  
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from any pay due and owing to the Participant and the balance in the Participant’s account will be paid to such Participant or, in the case of such Participant’s death, to his or her
designated beneficiary as if such Participant had withdrawn from the Plan under Section 7. An employee will be deemed to have terminated employment, for this purpose, if the corporation that employs him or her, having been a Designated
Subsidiary, ceases to be a Subsidiary, or if the employee is transferred to any corporation other than the Company or a Designated Subsidiary; provided, however, that if a Participant transfers from an Offering under the 423 Component to an Offering
under the Non-423 Component, the exercise of the Participant’s Option will be qualified under the 423 Component only to the extent that such exercise complies with Section 423 of the Code. If a
Participant transfers from an Offering under the Non-423 Component to an Offering under the 423 Component, the exercise of the Participant’s Option will remain
non-qualified under the Non-423 Component. An employee will not be deemed to have terminated employment for this purpose if the employee is on an approved leave of
absence for military service or sickness or for any other purpose approved by the Company, if the employee’s right to reemployment is guaranteed either by a statute or by contract or under the policy pursuant to which the leave of absence was
granted or if the Administrator otherwise provides in writing. 
 13.    Special Rules and Sub-Plans. Notwithstanding anything herein to the contrary, the Administrator may adopt special rules applicable to the employees of a particular Designated Subsidiary, whenever the Administrator determines that
such rules are necessary or appropriate for the implementation of the Plan in a jurisdiction where such Designated Subsidiary has employees; provided that if such special rules or sub-plans are inconsistent
with the requirements of Section 423(b) of the Code, the employees subject to such special rules or sub-plans will participate in the Non-423 Component. Any special
rules or sub-plans established pursuant to this Section 13 shall, to the extent possible, result in the employees subject to such rules having substantially the same rights as other Participants in the
Plan. 

  
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 14.    Optionees Not Stockholders. Neither the granting of an
Option to a Participant nor the deductions from his or her pay shall constitute such Participant a holder of the shares of Common Stock covered by an Option under the Plan until such shares have been purchased by and issued to him or her. 

15.    Rights Not Transferable. Rights under the Plan are not transferable by a Participant other than by will or
the laws of descent and distribution, and are exercisable during the Participant’s lifetime only by the Participant. 

16.    Application of Funds. All funds received or held by the Company under the Plan may be combined with other
corporate funds and may be used for any corporate purpose. 
 17.    Adjustment in Case of Changes Affecting Common
Stock. In the event of a subdivision of outstanding shares of Common Stock, the payment of a dividend in Common Stock or any other change affecting the Common Stock, the number of shares approved for the Plan and the share limitation set forth
in Section 8 shall be equitably or proportionately adjusted to give proper effect to such event. 

18.    Amendment of the Plan. The Board may at any time and from time to time amend the Plan in any respect, except
that without the approval within 12 months of such Board action by the stockholders, no amendment shall be made increasing the number of shares approved for the Plan or making any other change that would require stockholder approval in order for the
423 Component of the Plan, as amended, to qualify as an “employee stock purchase plan” under Section 423(b) of the Code. 

  
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 19.    Insufficient Shares. If the total number of shares of
Common Stock that would otherwise be purchased on any Exercise Date plus the number of shares purchased under previous Offerings under the Plan exceeds the maximum number of shares issuable under the Plan, the shares then available shall be
apportioned among Participants in proportion to the amount of payroll deductions accumulated on behalf of each Participant that would otherwise be used to purchase Common Stock on such Exercise Date. 

20.    Termination of the Plan. The Plan may be terminated at any time by the Board. Upon termination of the Plan,
all amounts in the accounts of Participants shall be promptly refunded. The Plan shall automatically terminate upon the tenth anniversary of the Registration Date. 

21.    Governmental Regulations. The Company’s obligation to sell and deliver Common Stock under the Plan is
subject to obtaining all governmental approvals required in connection with the authorization, issuance, or sale of such stock. 

22.    Governing Law. This Plan and all Options and actions taken thereunder shall be governed by, and construed in
accordance with the General Corporation Law of the State of Delaware as to matters within the scope thereof, and as to all other matters shall be governed by and construed in accordance with the internal laws of the State of Delaware, applied
without regard to conflict of law principles. 
 23.    Issuance of Shares. Shares may be issued upon exercise of
an Option from authorized but unissued Common Stock, from shares held in the treasury of the Company, or from any other proper source. 

24.    Tax Withholding. Participation in the Plan is subject to any minimum required tax withholding on income of
the Participant in connection with the Plan. Each Participant 

  
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agrees, by entering the Plan, that the Company and its Subsidiaries shall have the right to deduct any such taxes from any payment of any kind otherwise due to the Participant, including shares
issuable under the Plan. 
 25.    Notification Upon Sale of Shares Under the 423 Component. Each Participant
agrees, by entering the 423 Component of the Plan, to give the Company prompt notice of any disposition of shares purchased under the Plan where such disposition occurs within two years after the date of grant of the Option pursuant to which such
shares were purchased or within one (1) year after the date such shares were purchased. 
 26.    Effective
Date. This Plan shall take effect on the date immediately preceding the date upon which the registration statement on Form S-1 that is filed by the Company with respect to its initial public offering is
declared effective by the Securities and Exchange Commission following stockholder approval in accordance with applicable state law, the Company’s bylaws and articles of incorporation, each as amended, and applicable stock exchange rules. 

  
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 APPENDIX A 

Designated Subsidiaries 

  
 13EX-10.5.1

 Exhibit 10.5.1 

EMPLOYMENT AGREEMENT 

This Employment Agreement (“Agreement”) is made between Advantagene, Inc., a Delaware corporation d/b/a Candel Therapeutics
(the “Company”), and Paul Peter Tak, M.D. Ph.D. (the “Executive”) and is made effective as of September 12, 2020 “Effective Date”). 

WHEREAS, the Company desires to employ the Executive and the Executive desires to be employed by the Company on the new terms and conditions
contained herein; and 
 NOW, THEREFORE, in consideration of the mutual covenants and agreements herein contained and other good and
valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties agree as follows: 
 1. Employment.

 (a) Term. The Company shall employ the Executive and the Executive shall be employed by the Company pursuant to this Agreement
commencing as of the Effective Date and continuing until such employment is terminated in accordance with the provisions hereof (the “Term”). The Executive’s employment with the Company shall continue to be “at will,”
meaning that the Executive’s employment may be terminated by the Company or the Executive at any time and for any reason subject to the terms of this Agreement. 

(b) Position and Duties. The Executive shall serve as the President and Chief Executive Officer of the Company and shall have such
powers and duties as may from time to time be prescribed by the Board of Directors (the “Board”). In addition, the Company shall cause the Executive to be nominated for election to the Board and to be recommended to the stockholders
for election to the Board as long as the Executive remains the Chief Executive Officer of the Company (the “CEO”), provided that the Executive shall be deemed to have resigned from the Board and from any related positions upon
ceasing to serve as CEO for any reason. The Executive shall devote the Executive’s full working time and efforts to the business and affairs of the Company. Notwithstanding the foregoing, the Executive may serve on other boards of directors,
with the approval of the Board, or engage in religious, charitable or other community activities as long as such services and activities do not interfere with the Executive’s performance of the Executive’s duties to the Company. The Board
shall permit your current membership of the board of directors of Sitryx Therapeutics, Levicept and Citryll BV. The Board shall also permit you to continue to provide up to 4 hours per week of consulting services to Kintai Therapeutics,
Inc.(“Kintai”) and, notwithstanding anything to the contrary in the Restrictive Covenants Agreement (as defined below) or elsewhere, the Company recognizes that the work product or Inventions provided by you to Kintai in the course
of such consulting belong to Kintai. 
 2. Compensation and Related Matters. 

(a) Base Salary. The Executive’s initial base salary shall be paid at the rate of $500,000.00 per year for the first twelve months
of Executive’s Employment, and shall increase to $670,000.00 per year effective on the first anniversary of Executive’s commencement of employment if the Company has completed an underwritten initial public offering by on or about such
date. The Executive’s base salary shall be reviewed for increase annually by the Board or the Compensation Committee of the Board (the “Compensation Committee”). The base salary in effect at any given time is referred to herein
as “Base Salary.” The Base Salary shall be payable in a manner that is consistent with the Company’s usual payroll practices for executive officers. 

 (b) Incentive Compensation. 

(i) The Executive shall be eligible to receive cash incentive compensation as determined by the Board or the Compensation
Committee from time to time. The Executive’s initial target annual incentive compensation shall be 50% percent of the Executive’s Base Salary plus, with respect to any bonus payable in respect of the 2020 fiscal year and the 2021 fiscal
year, any Signing Bonus (as defined below) paid in the relevant fiscal year for which such target annual incentive compensation amount relates. The target annual incentive compensation in effect at any given time is referred to herein as
“Target Bonus.” The actual amount of the Executive’s annual incentive compensation, if any, shall be determined in the sole discretion of the Board or the Compensation Committee, subject to the terms of any applicable incentive
compensation plan that may be in effect from time to time. Except as otherwise provided herein, as may be provided by the Board or the Compensation Committee or as may otherwise be set forth in the applicable incentive compensation plan, the
Executive must be employed by the Company on the day such annual incentive compensation is paid to receive any annual incentive compensation; provided, however, that such annual incentive compensation will be paid no later than March 15th of the following year. 
 (ii) The Executive will be eligible to receive a
signing bonus in the gross amount of $170,000, less applicable taxes and withholdings (the “Signing Bonus”), which will be paid in four equal installments in the gross amount of $42,500 each. The first installment of the Signing
Bonus will be paid in the first pay period following the Effective Date, provided that the Executive remains employed as of the date of payment. The second installment of the Signing Bonus will be paid in the first pay period following the
three-month anniversary of the Effective Date, provided that the Executive remains employed as of the date of payment. The third installment of the Signing Bonus will be paid in the first pay period following the
six-month anniversary of the Effective Date, provided that the Executive remains employed as of the date of payment. The fourth and final installment of the Signing Bonus will be paid in the first pay period
following the nine-month anniversary of the Effective Date, provided that the Executive remains employed as of the date of payment. 
 (c)
Expenses. The Executive shall be entitled to receive prompt reimbursement for all reasonable expenses incurred by the Executive during the Term in performing services hereunder, in accordance with the policies and procedures then in effect
and established by the Company for its executive officers. 
 (d) Other Benefits. The Executive shall be eligible to participate in
or receive benefits under the Company’s employee benefit plans in effect from time to time, subject to the terms of such plans. 

 (e) Paid Time Off. The Executive shall be entitled to take paid time off in
accordance with the Company’s applicable paid time off policy for executives as may be in effect from time to time. The Executive shall also be entitled to all paid holidays given by the Company to its executive officers. 

(f) Equity. In connection with the commencement of the Executive’s employment, the Company will recommend to the Board that
Executive be granted an option to purchase a number of shares of the Company’s common stock equal to 6% of the Company’s fully diluted capitalization as of the date of grant, with an exercise price equal to the fair market value of the
Company’s common stock as of the date of such grant (expected to be based on the Company’s most recent third party 409A valuation as of September 1, 2020), subject to time-based vesting as follows: 25% shall vest on the
Executive’s employment commencement date, 25% shall vest on the 12-month anniversary of Executive’s employment commencement date, and 1/36 of the total remaining unvested shall vest monthly
thereafter over the remaining 3 years until all are vested, in each case subject to Executive’s continued employment with the Company on each such vesting date, except as otherwise provided in this Agreement. In addition, the Company will
recommend to the Board that Executive be granted an option to purchase a number of shares of the Company’s common stock equal to 1% of the Company’s fully diluted capitalization as of the date of grant, with an exercise price equal to the
fair market value of the Company’s common stock as of the date of such grant (expected to be based on the Company’s most recent third party 409A valuation as of September 1, 2020) (the “Strategic Transaction Equity
Award”), which grant shall vest and become exercisable in full upon (i) following the Company’s initial public offering of its common stock and (ii) following such initial public offering and on or prior to the third (3rd) anniversary of the Effective Date, the last reported sale price for one share of the Company’s common stock on the principal national securities exchange on which the shares of the
Company’s common stock are listed for ten consecutive trading days equals or exceeds $15.00 (subject to adjustment in the event of changes in the Company’s Common Stock by reason of stock dividends, splits, recapitalizations,
reclassifications, combinations or exchanges of shares, separations, reorganizations, liquidations, or the like). The equity awards held by the Executive shall be governed by the terms and conditions of the Company’s applicable equity incentive
plan(s) and the applicable award agreement(s) governing the terms of such equity awards held by the Executive (collectively, the “Equity Documents”); provided, however, and notwithstanding anything to the contrary in the Equity
Documents, all stock options and other stock-based awards held by the Executive that are subject solely to time-based vesting (the “Time-Based Equity Awards”) shall immediately accelerate and become fully vested and exercisable or
nonforfeitable as of the earlier of (i) the consummation of a Change in Control (as defined below), or (ii), subject to the following sentence, the termination of the Executive’s employment by the Company without Cause (as defined below)
or by the Executive for Good Reason (as defined below); and, in the event of (i) or (ii), the Executive will have no less than twelve (12) months to exercise vested, unexpired stock options (both strategic transaction and solely
time-based). In the event of the termination of Executive’s employment by the Company without Cause or by the Executive for Good Reason pursuant to Section 3(e)(iv) below, Executive’s Time-Based Equity Awards shall immediately
accelerate and become fully vested and exercisable or nonforfeitable in connection with a termination pursuant to clause (ii) of the prior sentence if, and only if, prior to the termination: (a) the Board had not voted unanimously (other
than the Executive) to terminate the Executive’s employment without Cause, or (b) if the relevant termination event is a termination 

 
by Executive for Good Reason pursuant to Section 3(e)(iv) below, the Board had not voted unanimously (except for the Executive) to materially reduce the Executive’s duties, authority,
or responsibilities. Notwithstanding the foregoing, any unvested portion of an equity award that was not forfeited on the Date of Termination shall be forfeited if the Separation Agreement and Release does not become effective within the time period
set forth therein; and 
 (g) Relocation Assistance. The Company shall provide you with a
one-time lump sum payment of $80,000 to assist you with your relocation to the Greater Boston area in Massachusetts if and when you relocate in 2022 or thereafter, paid on the next regularly scheduled payroll
date after the relocation. If within the 12 months following the Executive’s receipt of the Relocation Package, the Executive terminates his employment other than for Good Reason (as defined below) or the Company terminates the Executive’s
employment for Cause (as defined below), the Executive will be obligated to repay the Company the full amount of the Relocation Package within 30 days following the Date of Termination (as defined below). The Executive agrees that the Company may
deduct from any compensation owed to the Executive at the time of termination up to the full amount that the Executive is obligated to repay to the Company pursuant to this Section 2(g), to the extent permitted under applicable law. 

(h) Other Expenses. The Company shall reimburse the Executive for the following reasonable costs incurred by him, subject to the
Executive’s timely submission of applicable documentation pursuant to the sentence below: (i) expenses related to the Executive’s travel to Massachusetts and his temporary housing in Massachusetts, in an amount not to exceed $20,000
per month, which amount will be grossed up in respect of any related taxes payable by Executive, (ii) reasonable legal fees related to obtaining the Executive’s 0-1 visa, (iii) reasonable fees
of an independent tax and accounting advisor to assist Executive with his US and foreign tax status determination and compliance, in an amount not to exceed $10,000 in the aggregate per year, and (iv) reasonable legal fees related to the review
and negotiation of the terms of this Agreement, in an amount not to exceed $10,000. All expenses must be submitted to the Company on a monthly basis, no later than the middle of the month following the month in which such expenses were incurred.

 3. Termination. The Executive’s employment hereunder may be terminated without any breach of this Agreement under the
following circumstances: 
 (a) Death. The Executive’s employment hereunder shall terminate upon his death. 

(b) Disability. The Company may terminate the Executive’s employment if the Executive is disabled and unable to perform the
essential functions of the Executive’s then existing position or positions under this Agreement with or without reasonable accommodation for a period of 180 days (which need not be consecutive) in any
12-month period. If any question shall arise as to whether during any period the Executive is disabled so as to be unable to perform the essential functions of the Executive’s then existing position or
positions with or without reasonable accommodation, the Executive may, and at the request of the Company shall, submit to the Company a certification in reasonable detail by a physician selected by the Company to whom the Executive or the
Executive’s guardian has no reasonable objection as to whether the Executive is so disabled or how long such disability is expected to continue, and 

 
such certification shall for the purposes of this Agreement be conclusive of the issue. The Executive shall cooperate with any reasonable request of the physician in connection with such
certification. If such question shall arise and the Executive shall fail to submit such certification, the Company’s determination of such issue shall be binding on the Executive. Nothing in this Section 3(b) shall be construed to waive
the Executive’s rights, if any, under existing law including, without limitation, the Family and Medical Leave Act of 1993, 29 U.S.C. §2601 et seq. and the Americans with Disabilities Act, 42 U.S.C. §12101 et seq. 

(c) Termination by the Company for Cause. The Company may terminate the Executive’s employment hereunder for Cause. For purposes
of this Agreement, “Cause” shall mean any of the following, as expressly determined by the Board: 
 (i)
Executive’s conviction of any felony or any crime involving fraud or dishonesty; 
 (ii) Executive’s participation
in a fraud, act of dishonesty or other act of gross misconduct that adversely affect the Company; 
 (iii) conduct by
Executive that demonstrates Executive’s gross unfitness to serve; 
 (iv) Executive’s violation of any statutory or
fiduciary duty, or duty of loyalty, owed to the Company; 
 (v) Executive’s breach of any material term of any contract
between such Executive and the Company; and/or 
 (vi) Executive’s material violation of Company policy. 

(vii) Whether a termination is for Cause shall be decided by the Board in its sole and exclusive judgment and discretion,
exercised in good faith. Prior to any termination for Cause pursuant to each event listed in (iv), (v) and (vi) above, to the extent such event(s) is capable of being cured by Executive, (A) the Company shall give the Executive notice of
such event(s), which notice shall specify in reasonable detail the circumstances constituting Cause, and (B) there shall be no Cause with respect to any such event(s) if the Board determines in good faith that such events have been cured by
Executive within fifteen (15) days after the delivery of such notice. 
 (d) Termination by the Company without Cause. The
Company may terminate the Executive’s employment hereunder at any time without Cause. Any termination by the Company of the Executive’s employment under this Agreement which does not constitute a termination for Cause under
Section 3(c) and does not result from the death or disability of the Executive under Section 3(a) or (b) shall be deemed a termination without Cause. 

 (e) Termination by the Executive. The Executive may terminate employment hereunder at
any time for any reason, including but not limited to, Good Reason. For purposes of this Agreement, “Good Reason” shall mean that the Executive has completed all steps of the Good Reason Process (hereinafter defined) following the
occurrence of any of the following events without the Executive’s consent (each, a “Good Reason Condition”): 

(i) a material reduction by the Company of Executive’s Base Salary as initially set forth herein or as the same may be
increased from time to time, provided, however, that if such reduction occurs in connection with a Company-wide decrease in executive team compensation, such reduction shall not constitute Good Reason; 

(ii) a material breach of this Agreement by the Company; 

(iii) following Executive’s relocation to Massachusetts, the relocation of Executive’s principal place of employment,
without Executive’s consent, in a manner that lengthens his one-way commute distance by twenty-five (25) or more miles from his then-current principal place of employment immediately prior to such
relocation; or 
 (iv) a material reduction in Executive’s duties, authority, or responsibilities relative to
Executive’s duties, authority, or responsibilities in effect immediately prior to such reduction unless Executive is performing duties and responsibilities for the Company or its successor that are similar to those Executive was performing for
the Company immediately prior to such transaction. 
 The “Good Reason Process” consists of the following steps: 

(v) the Executive reasonably determines in good faith that a Good Reason Condition has occurred; 

(vi) the Executive notifies the Company in writing of the first occurrence of the Good Reason Condition within 30 days of the
first occurrence of such condition; 
 (vii) the Executive cooperates in good faith with the Company’s efforts, for a
period of not less than 30 days following such notice (the “Cure Period”), to remedy the Good Reason Condition; 

(viii) notwithstanding such efforts, the Good Reason Condition continues to exist; and 

(ix) the Executive terminates employment within 30 days after the end of the Cure Period. 

If the Company cures the Good Reason Condition during the Cure Period, Good Reason shall be deemed not to have occurred. 

4. Matters Related to Termination. 

(a) Notice of Termination. Except for termination as specified in Section 3(a), any termination of the Executive’s employment
by the Company or any such termination by the Executive shall be communicated by written Notice of Termination to the other party hereto. For purposes of this Agreement, a “Notice of Termination” shall mean a notice which shall
indicate the specific termination provision in this Agreement relied upon. 

 (b) Date of Termination. “Date of Termination” shall mean:
(i) if the Executive’s employment is terminated by death, the date of death; (ii) if the Executive’s employment is terminated on account of disability under Section 3(b) or by the Company for Cause under Section 3(c),
the date on which Notice of Termination is given; (iii) if the Executive’s employment is terminated by the Company without Cause under Section 3(d), the date on which a Notice of Termination is given or such later date specified by
the Company in the Notice of Termination if agreed to by the Executive; (iv) if the Executive’s employment is terminated by the Executive under Section 3(e) other than for Good Reason, 30 days after the date on which a Notice of
Termination is given, and (v) if the Executive’s employment is terminated by the Executive under Section 3(e) for Good Reason, the date on which a Notice of Termination is given after the end of the Cure Period. Notwithstanding the
foregoing, in the event that the Executive gives a Notice of Termination to the Company, the Company may unilaterally accelerate the Date of Termination and such acceleration shall not result in a termination by the Company for purposes of this
Agreement. 
 (c) Accrued Obligations. If the Executive’s employment with the Company is terminated for any reason, the Company
shall pay or provide to the Executive (or to the Executive’s authorized representative or estate) (i) any Base Salary earned through the Date of Termination; (ii) unpaid expense reimbursements (subject to, and in accordance with,
Section 2(c) of this Agreement); and (iii) any vested benefits the Executive may have under any employee benefit plan of the Company through the Date of Termination, which vested benefits shall be paid and/or provided in accordance with
the terms of such employee benefit plans (collectively, the “Accrued Obligations”); provided, however, that if the Executive’s employment with the Company is terminated due to death, disability, by the Company without Cause or
by the Executive with Good Reason, the Accrued Obligations shall also include any as yet unpaid Target Bonus for the prior year. 
 (d)
Resignation of All Other Positions. To the extent applicable, the Executive shall be deemed to have resigned from all officer and board member positions that the Executive holds with the Company or any of its respective subsidiaries and
affiliates upon the termination of the Executive’s employment for any reason. The Executive shall execute any documents in reasonable form as may be requested to confirm or effectuate any such resignations. 

5. Severance Pay and Benefits Upon Termination by the Company without Cause or by the Executive for Good Reason Outside the Change in
Control Period. If the Executive’s employment is terminated by the Company without Cause as provided in Section 3(d), or the Executive terminates employment for Good Reason as provided in Section 3(e), in each case outside of the
Change in Control Period, then, in addition to the Accrued Obligations, and subject to (i) the Executive signing a separation agreement and release in a form and manner satisfactory to the Company, which shall include, without limitation, a
general release of claims against the Company and all related persons and entities, a reaffirmation of all of the Executive’s Continuing Obligations (as defined below), and, in the Company’s sole discretion, a one-year post-employment noncompetition agreement, and shall provide that if the Executive breaches 

 
any of the Continuing Obligations, all payments of the Severance Amount shall immediately cease (the “Separation Agreement and Release”), and (ii) the Separation Agreement
and Release becoming irrevocable, all within 60 days after the Date of Termination (or such shorter period as set forth in the Separation Agreement and Release), which shall include a seven (7) business day revocation period: 

(a) the Company shall pay the Executive an amount equal to (A) 12 months of the Executive’s then-current Base Salary plus (B) the
Executive’s Target Bonus for the then- current year (the “Severance Amount”); provided that in the event the Executive is entitled to any payments pursuant to the Restrictive Covenants Agreement, the Severance Amount received
in any calendar year will be reduced by the amount the Executive is paid in the same such calendar year pursuant to the Restrictive Covenants Agreement (the “Restrictive Covenants Agreement Setoff’); and 

(b) subject to the Executive’s copayment of premium amounts at the applicable active employees’ rate and the Executive’s proper
election to receive benefits under the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended (“COBRA”), the Company shall pay to the group health plan provider or the COBRA provider a monthly payment equal to the
monthly employer contribution that the Company would have made to provide health insurance to the Executive if the Executive had remained employed by the Company until the earliest of (A) the 12 month anniversary of the Date of Termination;
(B) the date that the Executive becomes eligible for group medical plan benefits under any other employer’s group medical plan; or (C) the cessation of the Executive’s health continuation rights under COBRA; provided, however,
that if the Company determines that it cannot pay such amounts to the group health plan provider or the COBRA provider (if applicable) without potentially violating applicable law (including, without limitation, Section 2716 of the Public
Health Service Act), then the Company shall convert such payments to payroll payments directly to the Executive for the time period specified above. Such payments to the Executive shall be subject to
tax-related deductions and withholdings and paid on the Company’s regular payroll dates. 
 The amounts payable
under Section 5, to the extent taxable, shall be paid out in substantially equal installments in accordance with the Company’s payroll practice over 12 months commencing within 60 days after the Date of Termination; provided, however, that
if the 60-day period begins in one calendar year and ends in a second calendar year, such payments, to the extent they qualify as “non-qualified deferred
compensation” within the meaning of Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”), shall begin to be paid in the second calendar year by the last day of such
60-day period; provided, further, that the initial payment shall include a catch-up payment to cover amounts retroactive to the day immediately following the Date of
Termination. Each payment pursuant to this Agreement is intended to constitute a separate payment for purposes of Treasury Regulation Section 1,409A-2(b)(2). 

6. Severance Pay and Benefits Upon Termination by the Company without Cause or by the Executive for Good Reason within the Change in
Control Period. The provisions of this Section 6 shall apply in lieu of, and expressly supersede, the provisions of Section 5 if (i) the Executive’s employment is terminated either (a) by the Company without Cause as
provided in Section 3(d), or (b) by the Executive for Good Reason as provided in Section 3(e), and (ii) the Date of Termination is on or within three (3) months before or 12 months after the occurrence of

 
the first event constituting a Change in Control (such period, the “Change in Control Period”). The provisions of this Section 6 shall terminate and be of no further force
or effect after the Change in Control Period. For the avoidance of doubt, (i) in no event will the Executive be entitled to severance benefits under both Section 5 and Section 6 of this Agreement, and (ii) if the Company has
commenced providing severance pay and benefits to the Executive under Section 5 prior to the date that the Executive becomes eligible to receive severance pay and benefits under this Section 6, the severance pay and benefits previously
provided to the Executive under Section 5 shall reduce the severance pay and benefits to be provided under this Section 6. 
 (a)
If the Executive’s employment is terminated by the Company without Cause as provided in Section 3(d) or the Executive terminates employment for Good Reason as provided in Section 3(e) and in each case the Date of Termination occurs
during the Change in Control Period, then, in addition to the Accrued Obligations, and subject to the signing of the Separation Agreement and Release by the Executive and the Separation Agreement and Release becoming fully effective, all within the
time frame set forth in the Separation Agreement and Release but in no event more than 60 days after the Date of Termination: 

(i) the Company shall pay the Executive a lump sum in cash in an amount equal to 1.5 times the sum of (A) the
Executive’s then-current Base Salary (or the Executive’s Base Salary in effect immediately prior to the Change in Control, if higher) plus (B) the Executive’s Target Bonus for the then-current year (or the Executive’s Target
Bonus in effect immediately prior to the Change in Control, if higher) (the “Change in Control Payment”); provided that the Change in Control Payment shall be reduced by the amount of the Restrictive Covenants Agreement Setoff, if
applicable; and 
 (ii) subject to the Executive’s copayment of premium amounts at the applicable active employees’
rate and the Executive’s proper election to receive benefits under COBRA, the Company shall pay to the group health plan provider or the COBRA provider a monthly payment equal to the monthly employer contribution that the Company would have
made to provide health insurance to the Executive if the Executive had remained employed by the Company until the earliest of (A) the 18 month anniversary of the Date of Termination; (B) the date that the Executive becomes eligible for
group medical plan benefits under any other employer’s group medical plan; or (C) the cessation of the Executive’s health continuation rights under COBRA; provided, however, that if the Company determines that it cannot pay such
amounts to the group health plan provider or the COBRA provider (if applicable) without potentially violating applicable law (including, without limitation, Section 2716 of the Public Health Service Act), then the Company shall convert such
payments to payroll payments directly to the Executive for the time period specified above. Such payments to the Executive shall be subject to tax-related deductions and withholdings and paid on the
Company’s regular payroll dates. 
 The amounts payable under this Section 6(a), to the extent taxable, shall be paid or commence to be paid
within 60 days after the Date of Termination or, if later, the Change in Control; provided, however, that if the 60-day period begins in one calendar year and ends in a second calendar year, such payments to
the extent they qualify as “non-qualified deferred compensation” within 

 
the meaning of Section 409A of the Code, shall be paid or commence to be paid in the second calendar year by the last day of such 60-day period;
provided, further, that the initial payment shall include a catch-up payment to cover amounts retroactive to the day immediately following the Date of Termination. Each payment pursuant to this Agreement is
intended to constitute a separate payment for purposes of Treasury Regulation Section 1.409A-2(b)(2). 

(b) Additional Limitation. 

(i) Anything in this Agreement to the contrary notwithstanding, in the event that the amount of any compensation, payment or
distribution by the Company to or for the benefit of the Executive, whether paid or payable or distributed or distributable pursuant to the terms of this Agreement or otherwise, calculated in a manner consistent with Section 280G of the Code
and the applicable regulations thereunder (the “Aggregate Payments”), would be subject to the excise tax imposed by Section 4999 of the Code, then the Aggregate Payments shall be reduced (but not below zero) so that the sum of
all of the Aggregate Payments shall be $1.00 less than the amount at which the Executive becomes subject to the excise tax imposed by Section 4999 of the Code; provided that such reduction shall only occur if it would result in the Executive
receiving a higher After Tax Amount (as defined below) than the Executive would receive if the Aggregate Payments were not subject to such reduction. In such event, the Aggregate Payments shall be reduced in the following order, in each case, in
reverse chronological order beginning with the Aggregate Payments that are to be paid the furthest in time from consummation of the transaction that is subject to Section 280G of the Code: (1) cash payments not subject to Section 409A
of the Code; (2) cash payments subject to Section 409A of the Code; (3) equity-based payments and acceleration; and (4) non-cash forms of benefits; provided that in the case of all the
foregoing Aggregate Payments all amounts or payments that are not subject to calculation under Treas. Reg. §1.280G-l, Q&A-24(b) or (c) shall be reduced
before any amounts that are subject to calculation under Treas. Reg. §1.280G-l, Q&A-24(b) or (c). 

(ii) For purposes of this Section 6(b), the “After Tax Amount” means the amount of the Aggregate Payments
less all federal, state, and local income, excise and employment taxes imposed on the Executive as a result of the Executive’s receipt of the Aggregate Payments. For purposes of determining the After Tax Amount, the Executive shall be deemed to
pay federal income taxes at the highest marginal rate of federal income taxation applicable to individuals for the calendar year in which the determination is to be made, and state and local income taxes at the highest marginal rates of individual
taxation in each applicable state and locality, net of the maximum reduction in federal income taxes which could be obtained from deduction of such state and local taxes. 

(iii) The determination as to whether a reduction in the Aggregate Payments shall be made pursuant to Section 6(b)(i)
shall be made by a nationally recognized accounting firm selected and paid for by the Company (the “Accounting Firm”), which shall provide detailed supporting calculations both to the Company and the Executive within 15 business
days of the Date of Termination, if applicable, or at such earlier time as is reasonably requested by the Company or the Executive. Any determination by the Accounting Firm shall be binding upon the Company and the Executive. 

 (c) Definitions. For purposes of this Section 6, “Change in
Control” shall mean the date on which the Company enters into a binding agreement pursuant to which: (A) any person, including a “group” as defined below, will acquire ownership of all or substantially all of the
Company’s equity, excluding any acquisition of stock by a person or group of persons who were members or shareholders of such company immediately prior to such acquisition; or (B) any person, including a “group” as defined below,
will acquire all or substantially all of the assets of the Company. For purposes of this definition, the term “group” shall have the same meaning as in Section 13(d)(3) of the Securities Exchange Act of 1934. None of the following
shall constitute a Sale Event for purposes of this Agreement: (x) the sale of stock of the Company or any successor in an initial public offering, (y) any restructuring, merger or conversion of the Company to a corporation or to an entity
organized under the laws of any jurisdiction other than the jurisdiction of the applicable company’s organization, whether by merger, conversion, consolidation, contribution of shares or assets, or otherwise, and where members immediately
before such restructuring, merger or conversion own any of the capital and voting interests of the resulting or surviving corporation or entity, or (z) any transaction or series of transactions principally for bona fide equity financing
purposes in which cash is received by the Company or any successor or indebtedness of the Company is cancelled or converted or a combination thereof. Furthermore, and notwithstanding anything herein to the contrary, an event which does not
constitute a change in the ownership, a change in the effective control, or a change in the ownership of a substantial portion of the assets of the Company, each as defined in Section 1,409A-3(i)(5) of
the Treasury Regulations (Title 26 of the Code of Federal Regulations, as amended from time to time), shall not constitute a Sale Event for purposes of this Agreement. 

7. Section 409A. 
 (a)
Anything in this Agreement to the contrary notwithstanding, if at the time of the Executive’s separation from service within the meaning of Section 409A of the Code, the Company determines that the Executive is a “specified
employee” within the meaning of Section 409A(a)(2)(B)(i) of the Code, then to the extent any payment or benefit that the Executive becomes entitled to under this Agreement on account of the Executive’s separation from service would be
considered deferred compensation otherwise subject to the 20 percent additional tax imposed pursuant to Section 409A(a) of the Code as a result of the application of Section 409A(a)(2)(B)(i) of the Code, such payment shall not be
payable and such benefit shall not be provided until the date that is the earlier of (A) six months and one day after the Executive’s separation from service, or (B) the Executive’s death. If any such delayed cash payment is
otherwise payable on an installment basis, the first payment shall include a catch-up payment covering amounts that would otherwise have been paid during the six-month
period but for the application of this provision, and the balance of the installments shall be payable in accordance with their original schedule. 

(b) All in-kind benefits provided and expenses eligible for reimbursement under this Agreement shall
be provided by the Company or incurred by the Executive during the time periods set forth in this Agreement. All reimbursements shall be paid as soon as 

 
administratively practicable, but in no event shall any reimbursement be paid after the last day of the taxable year following the taxable year in which the expense was incurred. The amount of in-kind benefits provided or reimbursable expenses incurred in one taxable year shall not affect the in-kind benefits to be provided or the expenses eligible for reimbursement
in any other taxable year (except for any lifetime or other aggregate limitation applicable to medical expenses). Such right to reimbursement or in-kind benefits is not subject to liquidation or exchange for
another benefit. 
 (c) To the extent that any payment or benefit described in this Agreement constitutes
“non-qualified deferred compensation” under Section 409A of the Code, and to the extent that such payment or benefit is payable upon the Executive’s termination of employment, then such
payments or benefits shall be payable only upon the Executive’s “separation from service.” The determination of whether and when a separation from service has occurred shall be made in accordance with the presumptions set forth in
Treasury Regulation Section 1.409A-1(h). 
 (d) The parties intend that this Agreement will be
administered in accordance with Section 409A of the Code. To the extent that any provision of this Agreement is ambiguous as to its compliance with Section 409A of the Code, the provision shall be read in such a manner so that all payments
hereunder comply with Section 409A of the Code. Each payment pursuant to this Agreement is intended to constitute a separate payment for purposes of Treasury Regulation Section 1.409A-2(b)(2). The
parties agree that this Agreement may be amended, as reasonably requested by either party, and as may be necessary to fully comply with Section 409A of the Code and all related rules and regulations in order to preserve the payments and
benefits provided hereunder without additional cost to either party. 
 (e) The Company makes no representation or warranty and shall have
no liability to the Executive or any other person if any provisions of this Agreement are determined to constitute deferred compensation subject to Section 409A of the Code but do not satisfy an exemption from, or the conditions of, such
Section. 
 8. Continuing Obligations. 

(a) Restrictive Covenants Agreements. As a condition of employment, the Executive shall be required to enter into the Proprietary
Information, Inventions, Noncompetition and Non-Solicitation Agreement attached hereto as Exhibit A (the “Restrictive Covenants Agreement”). The Executive acknowledges and agrees that
the Executive received the Restrictive Covenants Agreement-with this Agreement and at least ten (10) business days before the commencement of the Executive’s employment. For purposes of this Agreement, the obligations in this
Section 8 and those that arise in the Restrictive Covenants Agreement and any other agreement relating to confidentiality, assignment of inventions, or other restrictive covenants shall collectively be referred to as the “Continuing
Obligations.” 
 (b) Third-Party Agreements and Rights. The Executive hereby confirms that the Executive is not bound by the
terms of any agreement with any previous employer or other party which restricts in any way the Executive’s use or disclosure of information, other than confidentiality restrictions (if any), or the Executive’s engagement in any business
of the Company’s. The Executive represents to the Company that the Executive’s execution of this 

 
Agreement, the Executive’s employment with the Company and the performance of the Executive’s proposed duties for the Company will not violate any obligations the Executive may have to
any such previous employer or other party. In the Executive’s work for the Company, the Executive will not disclose or make use of any information in violation of any agreements with or rights of any such previous employer or other party, and
the Executive will not bring to the premises of the Company any copies or other tangible embodiments of non-public information belonging to or obtained from any such previous employment or other party. 

(c) Litigation and Regulatory Cooperation. During and after the Executive’s employment, the Executive shall cooperate fully with
the Company in (i) the defense or prosecution of any claims or actions now in existence or which may be brought in the future against or on behalf of the Company which relate to events or occurrences that transpired while the Executive was
employed by the Company, and (ii) the investigation, whether internal or external, of any matters about which the Company believes the Executive may have knowledge or information. The Executive’s full cooperation in connection with such
claims, actions or investigations shall include, but not be limited to, being available to meet with counsel to answer questions or to prepare for discovery or trial and to act as a witness on behalf of the Company at mutually convenient times.
During and after the Executive’s employment, the Executive also shall cooperate fully with the Company, at mutually convenient times, in connection with any investigation or review of any federal, state or local regulatory authority as any such
investigation or review relates to events or occurrences that transpired while the Executive was employed by the Company. The Company shall reimburse the Executive for any reasonable
out-of-pocket expenses incurred in connection with the Executive’s performance of obligations pursuant to this Section 8(c). It is anticipated and intended
that the Executive’s post-employment cooperation pursuant to this Section 8 (c) will not unreasonably interfere with his other employment, business or personal obligations. 

(d) Relief. The Executive agrees that it would be difficult to measure any damages caused to the Company which might result from any
material breach by the Executive of the Continuing Obligations, and that in any event money damages would be an inadequate remedy for any such breach. Accordingly, the Executive agrees that if the Executive materially breaches, or proposes to
materially breach, any portion of the Continuing Obligations, the Company shall be entitled, in addition to all other remedies that it may have, to an injunction or other appropriate equitable relief to restrain any such material breach without
showing or proving any actual damage to the Company. 
 9. Consent to Jurisdiction. The parties hereby consent to the jurisdiction of
the state and federal courts of the Commonwealth of Massachusetts. Accordingly, with respect to any such court action, the Executive (a) submits to the personal jurisdiction of such courts; (b) consents to service of process; and
(c) waives any other requirement (whether imposed by statute, rule of court, or otherwise) with respect to personal jurisdiction or service of process. 

10. Integration. This Agreement constitutes the entire agreement between the parties with respect to the subject matter hereof and
supersedes all prior agreements between the parties concerning such subject matter. 

 11. Withholding; Tax Effect. All payments made by the Company to the Executive under
this Agreement shall be net of any tax or other amounts required to be withheld by the Company under applicable law. Nothing in this Agreement shall be construed to require the Company to make any payments to compensate the Executive for any adverse
tax effect associated with any payments or benefits or for any deduction or withholding from any payment or benefit. 
 12. Successors
and Assigns. Neither the Executive nor the Company may make any assignment of this Agreement or any interest in it, by operation of law or otherwise, without the prior written consent of the other; provided, however, that the Company may assign
its rights and obligations under this Agreement (including the Restrictive Covenants Agreement) without the Executive’s consent to any affiliate or to any person or entity with whom the Company shall hereafter effect a reorganization or
consolidation, into which the Company merges or to whom it transfers all or substantially all of its properties or assets; provided further that if the Executive remains employed or becomes employed by the Company, the purchaser or any of their
affiliates in connection with any such transaction, then the Executive shall not be entitled to any payments, benefits or vesting pursuant to Section 5 or pursuant to Section 6 of this Agreement solely as a result of such transaction. This
Agreement shall inure to the benefit of and be binding upon the Executive and the Company, and each of the Executive’s and the Company’s respective successors, executors, administrators, heirs and permitted assigns. In the event of the
Executive’s death after the Executive’s termination of employment but prior to the completion by the Company of all payments or other compensation due to the Executive under this Agreement, the Company shall continue such payments and
provide such other compensation to the Executive’s beneficiary designated in writing to the Company prior to the Executive’s death (or to the Executive’s estate, if the Executive fails to make such designation). 

13. Enforceability. If any portion or provision of this Agreement (including, without limitation, any portion or provision of any
section of this Agreement) shall to any extent be declared illegal or unenforceable by a court of competent jurisdiction, then the remainder of this Agreement, or the application of such portion or provision in circumstances other than those as to
which it is so declared illegal or unenforceable, shall not be affected thereby, and each portion and provision of this Agreement shall be valid and enforceable to the fullest extent permitted by law. 

14. Survival. The provisions of this Agreement shall survive the termination of this Agreement and/or the termination of the
Executive’s employment to the extent necessary to effectuate the terms contained herein. 
 15. Waiver. No waiver of any
provision hereof shall be effective unless made in writing and signed by the waiving party. The failure of any party to require the performance of any term or obligation of this Agreement, or the waiver by any party of any breach of this Agreement,
shall not prevent any subsequent enforcement of such term or obligation or be deemed a waiver of any subsequent breach. 
 16.
Notices. Any notices, requests, demands and other communications provided for by this Agreement shall be sufficient if in writing and delivered in person or sent by a nationally or internationally recognized overnight courier service or by
registered or certified mail, postage prepaid, return receipt requested, to the Executive at the last address the Executive has filed in writing with the Company or, in the case of the Company, at its main offices, attention of the Board. 

 17. Amendment. This Agreement may be amended or modified only by a written instrument
signed by the Executive and by a duly authorized representative of the Company. 
 18. Effect on Other Plans and Agreements. An
election by the Executive to resign for Good Reason under the provisions of this Agreement shall not be deemed a voluntary termination of employment by the Executive for the purpose of interpreting the provisions of any of the Company’s benefit
plans, programs or policies. Nothing in this Agreement shall be construed to limit the rights of the Executive under the Company’s benefit plans, programs or policies except as otherwise provided in Section 8 hereof, and except that the
Executive shall have no rights to any severance benefits under any Company severance pay plan, offer letter or otherwise. Except for the Restrictive Covenants Agreement, in the event that the Executive is party to an agreement with the Company
providing for payments or benefits under such agreement and this Agreement, the terms of this Agreement shall govern and the Executive may receive payment under this Agreement only and not both. Further, Section 5 and Section 6 of this
Agreement are mutually exclusive and in no event shall the Executive be entitled to payments or benefits pursuant to Section 5 and Section 6 of this Agreement. 

19. Governing Law. This is a Massachusetts contract and shall be construed under and be governed in all respects by the laws of the
Commonwealth of Massachusetts, without giving effect to the conflict of laws principles thereof. With respect to any disputes concerning federal law, such disputes shall be determined in accordance with the law as it would be interpreted and applied
by the United States Court of Appeals for the First Circuit. 
 20. Counterparts. This Agreement may be executed in any number of
counterparts, each of which when so executed and delivered shall be taken to be an original; but such counterparts shall together constitute one and the same document. 

[Signature page follows.] 

 IN WITNESS WHEREOF, the parties have executed this Agreement effective on the Effective
Date. 
  

			
	ADVANTAGENE, INC.
	
	/s/ Paul B. Manning
		
	By:	 	Paul Manning
	Its:	 	Director
	
	EXECUTIVE
	
	/s/ Paul Peter Tak
	Paul Peter Tak, M.D. Ph.D.

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