EX-10.6





 Exhibit 10.6 

MINK THERAPEUTICS, INC. 

2021 EQUITY INCENTIVE PLAN 
 1. DEFINED
TERMS 
 Exhibit A, which is incorporated by reference, defines certain terms used in the Plan and includes certain operational
rules related to those terms. 
 2. PURPOSE 

The Plan has been established to advance the interests of the Company by providing for the grant to Participants of Stock and Stock-based
Awards. 
 3. ADMINISTRATION 
 The Plan
will be administered by the Administrator. The Administrator has discretionary authority, subject only to the express provisions of the Plan, to administer and interpret the Plan and any Awards; to determine eligibility for and grant Awards; to
determine the exercise price, base value from which appreciation is measured, or purchase price, if any, applicable to any Award, to determine, modify, accelerate or waive the terms and conditions of any Award; to determine the form of settlement of
Awards (whether in cash, shares of Stock, other Awards or other property); to prescribe forms, rules and procedures relating to the Plan and Awards; and to otherwise do all things necessary or desirable to carry out the purposes of the Plan or any
Award. Determinations of the Administrator made with respect to the Plan or any Award are conclusive and bind all persons. 
 4. SHARE POOL; LIMITS ON
AWARDS 
 (a) Number of Shares. Subject to adjustment as provided in Section 7(b), the maximum number of
shares of Stock that may be delivered in satisfaction of Awards under the Plan is (i) 2,000,000 shares (the “Initial Share Pool”), plus (ii) the number of shares of Stock underlying awards under the Prior Plan that on or after the Date of
Adoption expire or become unexercisable without delivery of shares, are forfeited to, or repurchased for cash by, the Company, are settled in cash, or otherwise become available again for grant under the Prior Plan, in each case, in accordance with
its terms (in the case of this subclause (ii), not to exceed 4,113,487 shares of Stock in the aggregate). The Initial Share Pool will automatically increase on January 1st of each year from 2022 to 2031 by the lesser of (i) four percent (4%) of
the number of shares of Stock outstanding as of the close of business on the immediately preceding December 31st and (ii) the number of shares of Stock determined by the Board on or prior to such date for such year (the Initial Share Pool, as
it may be so increased, together with any shares that are available for delivery under the Prior Plan, as provided for above, the “Share Pool”). Up to 14,577,893 shares of Stock from the Share Pool may be delivered in satisfaction of ISOs,
but nothing in this Section 4(a) will be construed as requiring that any, or any fixed number of, ISOs be awarded under the Plan. For purposes of this Section 4(a), shares of Stock shall not be treated as delivered under the Plan, and will
not reduce the Share Pool, unless and until, and to the extent, they are actually delivered to a Participant. Without limiting the generality of the foregoing, the number of shares of Stock delivered in satisfaction of Awards













 
will be determined (i) by excluding shares of Stock withheld by the Company in payment of the exercise price or purchase price of the Award or in satisfaction of tax withholding requirements
with respect to the Award, (ii) by including only the number of shares of Stock delivered in settlement of a SAR any portion of which is settled in Stock, and (iii) by excluding any shares of Stock underlying Awards settled in cash or that
expire, become unexercisable, terminate or are forfeited to or repurchased by the Company, in each case, without the delivery of Stock (or retention, in the case of Restricted Stock or Unrestricted Stock). For the avoidance of doubt, the Share Pool
will not be increased by any shares of Stock delivered under the Plan that are subsequently repurchased using proceeds directly attributable to Stock Option exercises. The limits set forth in this Section 4(a) will be construed to comply with
the applicable requirements of Section 422. 
 (b) Substitute Awards. The Administrator may grant
Substitute Awards under the Plan. To the extent consistent with the applicable requirements of Section 422 and the regulations thereunder and other applicable legal requirements (including applicable stock exchange requirements), shares of
Stock delivered in respect of Substitute Awards will be in addition to and will not reduce the Share Pool. Notwithstanding the foregoing or anything in Section 4(a) to the contrary, if any Substitute Award is settled in cash or expires, becomes
unexercisable, terminates or is forfeited to or repurchased by the Company without the delivery (or retention, in the case of Restricted Stock or Unrestricted Stock) of Stock, the shares of Stock previously subject to such Substitute Award will not
increase the Share Pool or otherwise be available for future grant under the Plan. The Administrator will determine the extent to which the terms and conditions of the Plan apply to Substitute Awards, if at all, provided, however, that
Substitute Awards will not be subject to the limits described in Section 4(d) below. 
 (c) Type of Shares.
Stock delivered by the Company under the Plan may be authorized but unissued Stock, treasury Stock or previously issued Stock acquired by the Company. No fractional shares of Stock will be delivered under the Plan. 

(d) Director Limits. The aggregate value of all compensation granted or paid to any Director with respect to any
calendar year, including Awards granted under the Plan and cash fees or other compensation paid by the Company to such Director outside of the Plan for services as a Director during such calendar year, may not exceed $750,000 in the aggregate
($1,000,000 in the aggregate with respect to a Director’s first year of service on the Board), calculating the value of any Awards based on the grant date fair value in accordance with the Accounting Rules, assuming a maximum payout. For the
avoidance of doubt, the limitation in this Section 4(d) will not apply to any compensation granted or paid to a Director for services to the Company or a subsidiary other than as a Director, including, without limitation, as a consultant or
advisor to the Company or a subsidiary. 
 5. ELIGIBILITY AND PARTICIPATION 

The Administrator will select Participants from among Employees and Directors of, and consultants and advisors to, the Company and its
subsidiaries. Eligibility for ISOs is limited to individuals described in the first sentence of this Section 5 who are employees of the Company or of a “parent corporation” or “subsidiary corporation” of the Company as those
terms are defined in Section 424 of the Code. Eligibility for Stock Options, other than ISOs, and SARs is limited to individuals described in the first sentence of this Section 5 who are providing direct services on the date of grant of
the Award to the Company or to a subsidiary of the Company that would be described in the first sentence of Section 1.409A-1(b)(5)(iii)(E) of the Treasury Regulations. 

  
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 6. RULES APPLICABLE TO AWARDS 

(a) All Awards. 

(1) Award Provisions. The Administrator will determine the terms and conditions of all Awards, subject to the
limitations provided herein. No term of an Award shall provide for automatic “reload” grants of additional Awards upon the exercise of an Option or SAR. By accepting (or, under such rules as the Administrator may prescribe, being deemed to
have accepted) an Award, the Participant will be deemed to have agreed to the terms and conditions of the Award and the Plan. Notwithstanding any provision of the Plan to the contrary, Substitute Awards may contain terms and conditions that are
inconsistent with the terms and conditions specified herein, as determined by the Administrator. 
 (2) Term of
Plan. No Awards may be made after ten years from the Date of Adoption, but previously granted Awards may continue beyond that date in accordance with their terms. 

(3) Transferability. Neither ISOs nor, except as the Administrator otherwise expressly provides in accordance with
the third sentence of this Section 6(a)(3), other Awards may be transferred other than by will or by the laws of descent and distribution. During a Participant’s lifetime, ISOs and, except as the Administrator otherwise expressly provides
in accordance with the third sentence of this Section 6(a)(3), SARs and NSOs may be exercised only by the Participant. The Administrator may permit the gratuitous transfer (i.e., transfer not for value) of Awards other than ISOs, subject
to applicable securities and other laws and such terms and conditions as the Administrator may determine. 
 (4) Vesting;
Exercisability. The Administrator will determine the time or times at which an Award vests or becomes exercisable and the terms and conditions on which a Stock Option or SAR remains exercisable. Without limiting the foregoing, the
Administrator may at any time accelerate the vesting and/or exercisability of an Award (or any portion thereof), regardless of any adverse or potentially adverse tax or other consequences resulting from such acceleration. Unless the Administrator
expressly provides otherwise, however, the following rules will apply if a Participant’s Employment ceases: 

(A) Except as provided in (B) and (C) below, immediately upon the cessation of the Participant’s Employment,
each Stock Option and SAR (or portion thereof) that is then held by the Participant or by the Participant’s permitted transferees, if any, will cease to be exercisable and will terminate and each other Award that is then held by the Participant
or by the Participant’s permitted transferees, if any, to the extent not then vested, will be forfeited. 

  
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 (B) Subject to (C) and (D) below, each Stock Option and SAR (or
portion thereof) held by the Participant or the Participant’s permitted transferees, if any, immediately prior to the cessation of the Participant’s Employment, to the extent then vested and exercisable, will remain exercisable for the
lesser of (i) a period of three months following such cessation of Employment or (ii) the period ending on the latest date on which such Stock Option or SAR could have been exercised without regard to this Section 6(a)(4), and will
thereupon immediately terminate. 
 (C) Subject to (D) below, each Stock Option and SAR (or portion thereof) held
by a Participant or the Participant’s permitted transferees, if any, immediately prior to the cessation of the Participant’s Employment due to the Participant’s death or by the Company due to the Participant’s Disability, to the
extent then vested and exercisable, will remain exercisable for the lesser of (i) the one-year period ending on the first anniversary of such cessation of Employment or (ii) the period ending on the
latest date on which such Stock Option or SAR could have been exercised without regard to this Section 6(a)(4), and will thereupon immediately terminate. 

(D) All Awards (whether or not vested or exercisable) held by a Participant or the Participant’s permitted
transferees, if any, immediately prior to the cessation of the Participant’s Employment will immediately terminate upon (i) such cessation of Employment if the termination is for Cause or occurs in circumstances that in the determination
of the Administrator would have constituted grounds for the Participant’s Employment to be terminated for Cause (in each case, without regard to the lapsing of any required notice or cure periods in connection therewith) or (ii) the
Participant’s violation of any non-competition, non-solicitation, no-hire,
non-disparagement, confidentiality, invention assignment, or other restrictive covenant in favor of the Company or any of its affiliates by which the Participant is bound. 

(5) Recovery of Compensation. The Administrator may provide in any case that any outstanding Award (whether or not vested
or exercisable), the proceeds from the exercise or disposition of any Award or Stock acquired under any Award, and any other amounts received in respect of any Award or Stock acquired under any Award will be subject to forfeiture and disgorgement to
the Company, with interest and other related earnings, if the Participant to whom the Award was granted is not in compliance with any provision of the Plan or any applicable Award, or violates any
non-competition, non-solicitation, no-hire, non-disparagement, confidentiality, invention
assignment, or other restrictive covenant in favor of the Company or any of its affiliates by which the Participant is bound. Each Award will be subject to any policy of the Company or any of its subsidiaries that relates to trading on non-public information and permitted transactions with respect to shares of Stock, including limitations on hedging and pledging. In addition, each Award will be subject to any policy of the Company or
any of its affiliates that provides for forfeiture, disgorgement, or clawback with respect to incentive compensation that includes Awards under the Plan and will be further subject to forfeiture and disgorgement to the extent required by law or
applicable stock exchange listing standards, including, without limitation, Section 10D of the Exchange Act. Each Participant, by accepting or being deemed to have accepted an Award under the Plan, agrees (or will be deemed to have agreed) to
the terms of this Section 6(a)(5) and to any clawback, recoupment or similar policy of the Company or any of its subsidiaries and further agrees (or will be deemed to have further agreed) to cooperate fully with the Administrator, and to cause
any and all permitted transferees of the Participant to cooperate fully with the Administrator, to effectuate any forfeiture or 

  
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disgorgement described in this Section 6(a)(5). Neither the Administrator nor the Company nor any other person, other than the Participant and the Participant’s permitted transferees,
if any, will be responsible for any adverse tax or other consequences to a Participant or the Participant’s permitted transferees, if any, that may arise in connection with this Section 6(a)(5). 

(6) Taxes. The grant of an Award and the issuance, delivery, vesting and retention of Stock, cash or other
property under an Award are conditioned upon the full satisfaction by the Participant of all tax and other withholding requirements with respect to the Award. The Administrator will prescribe such rules for the withholding of taxes and other amounts
with respect to any Award as it deems necessary. Without limitation to the foregoing, the Company or any affiliate of the Company will have the authority and the right to deduct or withhold (by any means set forth herein or in an Award agreement),
or require a Participant to remit to the Company or an affiliate of the Company, an amount sufficient to satisfy all U.S. and non-U.S. federal, state and local income tax, social insurance, payroll tax, fringe
benefits tax, payment on account or other tax-related items related to participation in the Plan and any Award hereunder and legally applicable to the Participant and required by law to be withheld (including,
any amount deemed by the Company, in its discretion, to be an appropriate charge to the Participant even if legally applicable to the Company or any affiliate of the Company). The Administrator, in its sole discretion, may hold back shares of Stock
from an Award or permit a Participant to tender previously-owned shares of Stock in satisfaction of tax or other withholding requirements (but not in excess of the maximum withholding amount consistent with the Award being subject to equity
accounting treatment under the Accounting Rules). Any amounts withheld pursuant to this Section 6(a)(6) will be treated as though such amounts had been paid directly to the applicable Participant. In addition, the Company may, to the extent
permitted by law, deduct any such tax and other withholding amounts from any payment of any kind otherwise due to a Participant from the Company or any of its affiliates. 

(7) Dividend Equivalents. The Administrator may provide for the payment of amounts (on terms and subject to such
restrictions and conditions established by the Administrator) in lieu of cash dividends or other cash distributions with respect to Stock subject to an Award whether or not the holder of such Award is otherwise entitled to share in the actual
dividend or distribution in respect of such Award. Any entitlement to dividend equivalents or similar entitlements will be established and administered either consistent with an exemption from, or in compliance with, the applicable requirements of
Section 409A. 
 (8) Rights Limited. Nothing in the Plan or any Award will be construed as giving any
person the right to be granted an Award or to continued employment or service with the Company or any of its subsidiaries, or any rights as a stockholder except as to shares of Stock actually delivered under the Plan. The loss of existing or
potential profit in any Award will not constitute an element of damages in the event of a termination of a Participant’s Employment for any reason, even if the termination is in violation of an obligation of the Company or any of its
subsidiaries to the Participant. 
 (9) Coordination with Other Plans. Shares of Stock and/or Awards under the
Plan may be granted in tandem with, or in satisfaction of or substitution for, other Awards under the Plan or awards made under other compensatory plans or programs of the Company or any of its subsidiaries. For example, but without limiting the
generality of the foregoing, awards 

  
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under other compensatory plans or programs of the Company or any of its subsidiaries may be settled in Stock (including, without limitation, Unrestricted Stock) under the Plan if the
Administrator so determines, in which case the shares delivered will be treated as awarded under the Plan (and will reduce the number of shares thereafter available for delivery under the Plan in accordance with the rules set forth in
Section 4). 
 (10) Section 409A. 

(A) Without limiting the generality of Section 11(b) hereof, each Award will contain such terms as the
Administrator determines and will be construed and administered such that the Award either qualifies for an exemption from the requirements of Section 409A or satisfies such requirements. 

(B) Notwithstanding anything to the contrary in the Plan or any Award agreement, the Administrator may unilaterally
amend, modify or terminate the Plan or any outstanding Award, including but not limited to changing the form of the Award, if the Administrator determines that such amendment, modification or termination is necessary or desirable to avoid the
imposition of an additional tax, interest or penalty under Section 409A. 
 (C) If a Participant is determined on
the date of the Participant’s termination of Employment to be a “specified employee” within the meaning of that term under Section 409A(a)(2)(B) of the Code, then, with regard to any payment that is considered nonqualified
deferred compensation under Section 409A, to the extent applicable, payable on account of a “separation from service”, such payment will be made or provided on the date that is the earlier of (i) the first business day following
the expiration of the six-month period measured from the date of such “separation from service” and (ii) the date of the Participant’s death (the “Delay Period”). Upon the
expiration of the Delay Period, all payments delayed pursuant to this Section 6(a)(10)(C) (whether they would have otherwise been payable in a single lump sum or in installments in the absence of such delay) will be paid, without interest, on
the first business day following the expiration of the Delay Period in a lump sum and any remaining payments due under the Award will be paid in accordance with the normal payment dates specified for them in the applicable Award agreement. 

(D) For purposes of Section 409A, each payment made under the Plan or any Award will be treated as a separate
payment. 
 (E) With regard to any payment considered to be nonqualified deferred compensation under
Section 409A, to the extent applicable, that is payable upon a change in control of the Company or other similar event, to the extent required to avoid the imposition of an additional tax, interest or penalty under Section 409A, no amount
will be payable unless such change in control constitutes a “change in control event” within the meaning of Section 1.409A-3(i)(5) of the Treasury Regulations. 

  
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 (b) Stock Options and SARs. 

(1) Time and Manner of Exercise. Unless the Administrator expressly provides otherwise, no Stock Option or SAR
will be deemed to have been exercised until the Administrator receives a notice of exercise in a form acceptable to the Administrator that is signed by the appropriate person and accompanied by any payment required under the Award. The Administrator
may at any time limit or restrict the exercisability of any Stock Option or SAR in its discretion, including in connection with any Covered Transaction. Any attempt to exercise a Stock Option or SAR by any person other than the Participant will not
be given effect unless the Administrator has received such evidence as it may require that the person exercising the Award has the right to do so. 

(2) Exercise Price. The exercise price (or the base value from which appreciation is to be measured) per share of
each Award requiring exercise must be no less than 100% (in the case of an ISO granted to a 10-percent stockholder within the meaning of Section 422(b)(6) of the Code, 110%) of the Fair Market Value of a
share of Stock, determined as of the date of grant of the Award, or such higher amount as the Administrator may determine in connection with the grant. 

(3) Payment of Exercise Price. Where the exercise of an Award (or portion thereof) is to be accompanied by
payment, payment of the exercise price must be made by cash or check acceptable to the Administrator or, if so permitted by the Administrator and if legally permissible, (i) through the delivery of previously acquired unrestricted shares of
Stock, or the withholding of unrestricted shares of Stock otherwise deliverable upon exercise, in either case that have a Fair Market Value equal to the exercise price; (ii) through a broker-assisted cashless exercise program acceptable to the
Administrator; (iii) by other means acceptable to the Administrator; or (iv) by any combination of the foregoing permissible forms of payment. The delivery of previously acquired shares in payment of the exercise price under clause
(i) above may be accomplished either by actual delivery or by constructive delivery through attestation of ownership, subject to such rules as the Administrator may prescribe. 

(4) Maximum Term. The maximum term of Stock Options and SARs must not exceed 10 years from the date of grant (or
five years from the date of grant in the case of an ISO granted to a 10-percent stockholder described in Section 6(b)(2) above). 

(5) No Repricing. Except in connection with a corporate transaction involving the Company (which term includes,
without limitation, any stock dividend, stock split, extraordinary cash dividend, recapitalization, reorganization, merger, consolidation, split-up, spin-off,
combination or exchange of shares) or as otherwise contemplated by Section 7 below, the Company may not, without obtaining stockholder approval, (A) amend the terms of outstanding Stock Options or SARs to reduce the exercise price or base
value of such Stock Options or SARs, (B) cancel outstanding Stock Options or SARs in exchange for Stock Options or SARs that have an exercise price or base value that is less than the exercise price or base value of the original Stock Options
or SARs, or (C) cancel outstanding Stock Options or SARs that have an exercise price or base value greater than the Fair Market Value of a share of Stock on the date of such cancellation in exchange for cash or other consideration. 

  
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 7. EFFECT OF CERTAIN TRANSACTIONS 

(a) Mergers, etc. Except as otherwise expressly provided in an Award agreement or other
agreement or by the Administrator, the following provisions will apply in the event of a Covered Transaction: 
 (1) Assumption
or Substitution. If the Covered Transaction is one in which there is an acquiring or surviving entity, the Administrator may provide for (i) the assumption or continuation of some or all outstanding Awards or any portion thereof
or (ii) the grant of new awards in substitution therefor by the acquiror or survivor or an affiliate of the acquiror or survivor. 

(2) Cash-Out of Awards. Subject to Section 7(a)(5) below, the
Administrator may provide for payment (a “cash-out”), with respect to some or all Awards or any portion thereof (including only the vested portion thereof, with the unvested portion terminating as
provided in Section 7(a)(4) below), equal in the case of each applicable Award or portion thereof to the excess, if any, of (i) the Fair Market Value of one share of Stock multiplied by the number of shares of Stock subject to the Award or
such portion, minus (ii) the aggregate exercise or purchase price, if any, of such Award or such portion thereof (or, in the case of a SAR, the aggregate base value above which appreciation is measured), in each case on such payment and other
terms and subject to such conditions (which need not be the same as the terms and conditions applicable to holders of Stock generally), as the Administrator determines, including that any amounts paid in respect of such Award in connection with the
Covered Transaction be placed in escrow or otherwise made subject to such restrictions as the Administrator deems appropriate. For the avoidance of doubt, if the per share exercise or purchase price (or base value) of an Award or portion thereof is
equal to or greater than the Fair Market Value of one share of Stock, such Award or portion may be cancelled with no payment due hereunder or otherwise in respect thereof. 

(3) Acceleration of Certain Awards. Subject to Section 7(a)(5) below, the Administrator may provide that any
Award requiring exercise will become exercisable, in full or in part, and/or that the delivery of any shares of Stock remaining deliverable under any outstanding Award of Stock Units (including Restricted Stock Units and Performance Awards to the
extent consisting of Stock Units) will be accelerated, in full or in part, in each case on a basis that gives the holder of the Award a reasonable opportunity, as determined by the Administrator, following the exercise of the Award or the delivery
of the shares, as the case may be, to participate as a stockholder in the Covered Transaction. 
 (4) Termination of Awards
upon Consummation of Covered Transaction. Except as the Administrator may otherwise determine, each Award will automatically terminate (and in the case of outstanding shares of Restricted Stock, will automatically be forfeited)
immediately upon the consummation of the Covered Transaction, other than (i) any Award that is assumed, continued or substituted for pursuant to Section 7(a)(1) above, and (ii) any Award that by its terms, or as a result of action
taken by the Administrator, continues following the Covered Transaction. 

  
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 (5) Additional Limitations. Any share of Stock and any cash or
other property or other award delivered pursuant to Section 7(a)(1), Section 7(a)(2) or Section 7(a)(3) above with respect to an Award may, in the discretion of the Administrator, contain such restrictions, if any, as the
Administrator deems appropriate, including to reflect any performance or other vesting conditions to which the Award was subject and that did not lapse (and were not satisfied) in connection with the Covered Transaction. For purposes of the
immediately preceding sentence, a cash-out under Section 7(a)(2) above or an acceleration under Section 7(a)(3) above will not, in and of itself, be treated as the lapsing (or satisfaction) of a
performance or other vesting condition. In the case of Restricted Stock that does not vest and is not forfeited in connection with the Covered Transaction, the Administrator may require that any amounts delivered, exchanged or otherwise paid in
respect of such Stock in connection with the Covered Transaction be placed in escrow or otherwise made subject to such restrictions as the Administrator deems appropriate to carry out the intent of the Plan. 

(6) Uniform Treatment. For the avoidance of doubt, the Administrator need not treat Participants or Awards (or
portions thereof) in a uniform manner, and may treat different Participants and/or Awards differently, in connection with a Covered Transaction. 

(b) Changes in and Distributions with Respect to Stock. 

(1) Basic Adjustment Provisions. In the event of a stock dividend, extraordinary cash dividend, stock split or
combination of shares (including a reverse stock split), recapitalization, reorganization, merger, consolidation, combination, exchange of shares, liquidation, spin-off,
split-up, or other similar change in the Company’s capital structure that constitutes an equity restructuring within the meaning of the Accounting Rules, the Administrator shall make appropriate
adjustments to the maximum number of shares of Stock specified in Section 4(a) that may be delivered under the Plan and to the limits described in Section 4(d), and shall make appropriate adjustments to the number and kind of shares of
stock or securities underlying Awards then outstanding or subsequently granted, any exercise or purchase prices (or base values) relating to Awards and any other provision of Awards affected by such change. 

(2) Certain Other Adjustments. The Administrator may also make adjustments of the type described in
Section 7(b)(1) above to take into account distributions to stockholders other than those provided for in Sections 7(a) and 7(b)(1) above, or any other event, if the Administrator determines that adjustments are appropriate to avoid distortion
in the operation of the Plan or any Award. 
 (3) Continuing Application of Plan Terms. References in the Plan
to shares of Stock will be construed to include any stock or securities resulting from an adjustment pursuant to this Section 7. 

  
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 8. LEGAL CONDITIONS ON DELIVERY OF STOCK 

The Company will not be obligated to deliver any shares of Stock pursuant to the Plan or to remove any restriction from shares of Stock
previously delivered under the Plan until: (i) the Company is satisfied that all legal matters in connection with the issuance and delivery of such shares have been addressed and resolved; (ii) if the outstanding Stock is at the time of
delivery listed on any stock exchange or national market system, the shares to be delivered have been listed or authorized to be listed on such exchange or system upon official notice of issuance; and (iii) all conditions of the Award have been
satisfied or waived. The Company may require, as a condition to the exercise of an Award or the delivery of shares of Stock under an Award, such representations or agreements as counsel for the Company may consider appropriate to avoid violation of
the Securities Act of 1933, as amended, or any applicable state or non-U.S. securities law. Any Stock delivered to Participants under the Plan will be evidenced in such manner as the Administrator determines
appropriate, including book-entry registration or delivery of stock certificates. In the event that the Administrator determines that stock certificates will be issued in connection with Stock issued under the Plan, the Administrator may require
that such certificates bear an appropriate legend reflecting any restriction on transfer applicable to such Stock, and the Company may hold the certificates pending the lapse of the applicable restrictions. 

9. AMENDMENT AND TERMINATION 
 The
Administrator may at any time or times amend the Plan or any outstanding Award for any purpose which may at the time be permitted by applicable law, and may at any time terminate the Plan as to any future grants of Awards; provided, however,
that except as otherwise expressly provided in the Plan or the applicable Award, the Administrator may not, without the Participant’s consent, alter the terms of an Award so as to affect materially and adversely the Participant’s rights
under the Award, unless the Administrator expressly reserved the right to do so in the Plan or at the time the applicable Award was granted. Any amendments to the Plan will be conditioned upon stockholder approval only to the extent, if any, such
approval is required by applicable law (including the Code) or stock exchange requirements, as determined by the Administrator. For the avoidance of doubt, without limiting the Administrator’s rights hereunder, no adjustment to any Award
pursuant to the terms of Section 7 or Section 12 will be treated as an amendment requiring a Participant’s consent. 
 10. OTHER
COMPENSATION ARRANGEMENTS 
 The existence of the Plan or the grant of any Award will not affect the right of the Company or any of its
subsidiaries to grant any person bonuses or other compensation in addition to Awards under the Plan. 
 11. MISCELLANEOUS 

(a) Waiver of Jury Trial. By accepting or being deemed to have accepted an Award under the Plan, each Participant
waives (or will be deemed to have waived), to the maximum extent permitted under applicable law, any right to a trial by jury in any action, proceeding or counterclaim concerning any rights under the Plan or any Award, or under any amendment,
waiver, consent, instrument, document or other agreement delivered or which in the future may be delivered in connection therewith, and agrees (or will be deemed to have agreed) that any such action, proceedings or counterclaim will be tried before
a court and not before a jury. By accepting or being deemed to have accepted an Award under the Plan, each Participant certifies that no officer, representative, or attorney of the Company has represented, expressly or


  
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otherwise, that the Company would not, in the event of any action, proceeding or counterclaim, seek to enforce the foregoing waivers. Notwithstanding anything to the contrary in the Plan, nothing
herein is to be construed as limiting the ability of the Company and a Participant to agree to submit any dispute arising under the terms of the Plan or any Award to binding arbitration or as limiting the ability of the Company to require any
individual to agree to submit such disputes to binding arbitration as a condition of receiving an Award hereunder. 
 (b)
Limitation of Liability. Notwithstanding anything to the contrary in the Plan or any Award, none of the Company, nor any of its subsidiaries, nor the Administrator, nor any person acting on behalf of the Company, any of its
subsidiaries, or the Administrator, will be liable to any Participant, to any permitted transferee, to the estate or beneficiary of any Participant or any permitted transferee, or to any other person by reason of any acceleration of income, any
additional tax, or any penalty, interest or other liability asserted by reason of the failure of an Award to satisfy the requirements of Section 422 or Section 409A or by reason of Section 4999 of the Code, or otherwise asserted with
respect to any Award. 
 (c) Unfunded Plan. The Company’s obligations under the Plan are unfunded, and no
Participant will have any right to specific assets of the Company in respect of any Award. Participants will be general unsecured creditors of the Company with respect to any amounts due or payable under the Plan. 

12. ESTABLISHMENT OF SUB-PLANS 

The Administrator may at any time and from time to time (including before or after an Award is granted) establish, adopt, or revise any rules
and regulations as it may deem necessary or advisable to administer the Plan for Participants based outside of the U.S. and/or subject to the laws of countries other than the U.S., including by establishing one or more
sub-plans, supplements or appendices under the Plan or any Award agreement for the purpose of complying or facilitating compliance with non-U.S. laws or taking advantage
of tax favorable treatment or for any other legal or administrative reason determined by the Administrator. Any such sub-plan, supplement or appendix may contain, in each case, (i) such limitations on the
Administrator’s discretion under the Plan and (ii) such additional or different terms and conditions, as the Administrator deems necessary or desirable and will be deemed to be part of the Plan but will apply only to Participants within
the group to which the sub-plan, supplement or appendix applies (as determined by the Administrator); provided, however, that no sub-plan, supplement or
appendix, rule or regulation established pursuant to this provision shall increase the Share Pool. 
 13. GOVERNING LAW 

(a) Certain Requirements of Corporate Law. Awards and shares of Stock will be granted, issued and administered
consistent with the requirements of applicable Delaware law relating to the issuance of stock and the consideration to be received therefor, and with the applicable requirements of the stock exchanges or other trading systems on which the Stock is
listed or entered for trading, in each case as determined by the Administrator. 

  
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 (b) Other Matters. Except as otherwise provided by the express
terms of an Award agreement, under a sub-plan described in Section 12 or as provided in Section 13(a) above, the domestic substantive laws of the State of Delaware govern the provisions of the Plan
and of Awards under the Plan and all claims or disputes arising out of or based upon the Plan or any Award under the Plan or relating to the subject matter hereof or thereof without giving effect to any choice or conflict of laws provision or rule
that would cause the application of the domestic substantive laws of any other jurisdiction. 
 (c) Jurisdiction.
Subject to Section 11(a) and except as may be expressly set forth in an Award agreement, by accepting (or being deemed to have accepted) an Award, each Participant agrees or will be deemed to have agreed to (i) submit
irrevocably and unconditionally to the jurisdiction of the federal and state courts located within the geographic boundaries of the United States District Court for the District of Delaware for the purpose of any suit, action or other proceeding
arising out of or based upon the Plan or any Award; (ii) not commence any suit, action or other proceeding arising out of or based upon the Plan or any Award, except in the federal and state courts located within the geographic boundaries of
the United States District Court for the District of Delaware; and (iii) waive, and not assert, by way of motion as a defense or otherwise, in any such suit, action or proceeding, any claim that the Participant is not subject personally to the
jurisdiction of the above-named courts that the Participant’s property is exempt or immune from attachment or execution, that the suit, action or proceeding is brought in an inconvenient forum, that the venue of the suit, action or proceeding
is improper or that the Plan or any Award or the subject matter thereof may not be enforced in or by such court. 

  
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 EXHIBIT A 

Definition of Terms 

The following terms, when used in the Plan, have the meanings and are subject to the provisions set forth below: 

“Accounting Rules”: Financial Accounting Standards Board Accounting Standards Codification Topic 718, or any successor
provision. 
 “Administrator”: The Compensation Committee, except with respect to such matters that are not delegated to
the Compensation Committee by the Board (whether pursuant to committee charter or otherwise). The Compensation Committee (or the Board, with respect to such matters over which it retains authority under the Plan or otherwise) may delegate
(i) to one or more of its members (or one or more other members of the Board) such of its duties, powers and responsibilities as it may determine; (ii) to one or more officers of the Company the power to grant Awards to the extent
permitted by Section 152 or 157(c) of the Delaware General Corporation Law; and (iii) to such Employees or other persons as it determines such ministerial tasks as it deems appropriate. For purposes of the Plan, the term
“Administrator” will include the Board, the Compensation Committee, and the person or persons delegated authority under the Plan to the extent of such delegation, as applicable. 

“Award”: Any or a combination of the following: 

(i) Stock Options. 

(ii) SARs. 

(iii) Restricted Stock. 

(iv) Unrestricted Stock. 

(v) Stock Units, including Restricted Stock Units. 

(vi) Performance Awards. 

(vii) Awards (other than Awards described in (i) through (vi) above) that are convertible into or otherwise based on
Stock. 
 “Board”: The board of directors of the Company. 

“Cause”: In the case of any Participant who is party to an employment, change of control or severance-benefit agreement that
contains a definition of “Cause,” the definition set forth in such agreement applies with respect to such Participant for purposes of the Plan for so long as such agreement is in effect. In every other case, “Cause” means, as
determined by the Administrator, (i) a substantial failure of the Participant to perform the Participant’s duties and responsibilities to the Company or any of its subsidiaries or substantial negligence in the performance of such duties
and responsibilities; (ii) the commission by the Participant of a 

  
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felony or a crime involving moral turpitude; (iii) the commission by the Participant of theft, fraud, embezzlement, material breach of trust or any material act of dishonesty involving the
Company or any of its subsidiaries; (iv) a significant violation by the Participant of the code of conduct of the Company or any of its subsidiaries of any material policy of the Company or any of its subsidiaries, or of any statutory or common
law duty of loyalty to the Company or any of its subsidiaries; (v) material breach of any of the terms of the Plan or any Award made under the Plan, or of the terms of any other agreement between the Company or any of its subsidiaries and the
Participant; or (vi) other conduct by the Participant that could be expected to be harmful to the business, interests or reputation of the Company. 

“Code”: The U.S. Internal Revenue Code of 1986, as from time to time amended and in effect, or any successor statute as from
time to time in effect, including any applicable regulations and guidance thereunder. 
 “Company”: MiNK Therapeutics,
Inc., a Delaware corporation. 
 “Compensation Committee”: The compensation committee of the Board. 

“Covered Transaction”: Any of (i) a consolidation, merger or similar transaction or series of related transactions,
including a sale or other disposition of stock, in which the Company is not the surviving entity or which results in the acquisition of all or substantially all of the Company’s then outstanding common stock by a single person or entity or by a
group of persons and/or entities acting in concert, (ii) a sale or transfer of all or substantially all the Company’s assets, (iii) a dissolution or liquidation of the Company, or (iv) such other transaction or event as the
Administrator determines. Where a Covered Transaction involves a tender offer that is reasonably expected to be followed by a merger described in clause (i) (as determined by the Administrator), the Covered Transaction will be deemed to have
occurred upon consummation of the tender offer. 
 “Date of Adoption”: The earlier of the date the Plan was approved by the
Company’s stockholders or adopted by the Board, as determined by the Compensation Committee. 
 “Director”: A member
of the Board who is not an Employee. 
 “Disability”: In the case of any Participant who is party to an employment, change
of control or severance-benefit agreement that contains a definition of “Disability” (or a corollary term), the definition set forth in such agreement applies with respect to such Participant for purposes of the Plan for so long as such
agreement is in effect. In every other case, “Disability” means, as determined by the Administrator, absence from work due to a disability for a period in excess of ninety (90) days in any twelve (12)-month period that would entitle
the Participant to receive benefits under the Company’s long-term disability program as in effect from time to time (if the Participant were a participant in such program). 

“Employee”: Any person who is employed by the Company or any of its subsidiaries. 

  
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 “Employment”: A Participant’s employment or other service relationship
with the Company or any of its subsidiaries. Employment will be deemed to continue, unless the Administrator otherwise determines, so long as the Participant is employed by, or otherwise is providing services in a capacity described in
Section 5 of the Plan to, the Company or any of its subsidiaries. If a Participant’s employment or other service relationship is with any subsidiary of the Company and that entity ceases to be a subsidiary of the Company, the
Participant’s Employment will be deemed to have terminated when the entity ceases to be a subsidiary of the Company unless the Participant transfers Employment to the Company or one of its remaining subsidiaries. Notwithstanding the foregoing,
in construing the provisions of any Award relating to the payment of “nonqualified deferred compensation” (subject to Section 409A) upon a termination or cessation of Employment, references to termination or cessation of employment,
separation from service, retirement or similar or correlative terms will be construed to require a “separation from service” (as that term is defined in Section 1.409A-1(h) of the Treasury
Regulations, after giving effect to the presumptions contained therein) from the Company and from all other corporations and trades or businesses, if any, that would be treated as a single “service recipient” with the Company under Section 1.409A-1(h)(3) of the Treasury Regulations. The Company may, but need not, elect in writing, subject to the applicable limitations under Section 409A, any of the special elective rules prescribed
in Section 1.409A-1(h) of the Treasury Regulations for purposes of determining whether a “separation from service” has occurred. Any such written election will be deemed a part of the Plan. 

“Exchange Act”: The Securities Exchange Act of 1934, as amended. 

“Fair Market Value”: As of a particular date, (i) the closing price for a share of Stock reported on the Nasdaq Global
Stock Market (or any other national securities exchange on which the Stock is then listed) for that date or, if no closing price is reported for that date, the closing price on the immediately preceding date on which a closing price was reported or
(ii) in the event that the Stock is not traded on a national securities exchange, the fair market value of a share of Stock determined by the Administrator consistent with the rules of Section 422 and Section 409A to the extent
applicable. 
 “ISO”: A Stock Option intended to be an “incentive stock option” within the meaning of
Section 422. Each Stock Option granted pursuant to the Plan will be treated as providing by its terms that it is to be an NSO unless, as of the date of grant, it is expressly designated as an ISO in the applicable Award agreement. 

“NSO”: A Stock Option that is not intended to be an “incentive stock option” within the meaning of
Section 422. 
 “Participant”: A person who is granted an Award under the Plan. 

“Performance Award”: An Award subject to performance vesting conditions, which may include Performance Criteria. 

“Performance Criteria”: Specified criteria, other than the mere continuation of Employment or the mere passage of time, the
satisfaction of which is a condition for the grant, exercisability, vesting or full enjoyment of an Award. A Performance Criterion and any targets with respect thereto need not be based upon an increase, a positive or improved result or avoidance of
loss and may be applied to a Participant individually, or to a business unit or division of the Company or to the Company as a whole. A Performance Criterion may also be 

  
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based on individual performance and/or subjective performance criteria. The Administrator may provide that one or more of the Performance Criteria applicable to such Award will be adjusted in a
manner to reflect events (for example, but without limitation, acquisitions or dispositions) occurring during the performance period that affect the applicable Performance Criterion or Criteria.     

“Plan”: The MiNK Therapeutics, Inc. 2021 Equity Incentive Plan, as from time to time amended and in effect. 

“Prior Plan”: The AgenTus Therapeutics, Inc. 2018 Equity Incentive Plan, as amended.  

“Restricted Stock”: Stock subject to restrictions requiring that it be forfeited, redelivered or offered for sale to the
Company if specified performance or other vesting conditions are not satisfied. 
 “Restricted Stock Unit”: A Stock Unit
that is, or as to which the delivery of Stock or of cash in lieu of Stock is, subject to the satisfaction of specified performance or other vesting conditions. 

“SAR”: A right entitling the holder upon exercise to receive an amount (payable in cash or in shares of Stock of equivalent
value) equal to the excess of the Fair Market Value of the shares of Stock subject to the right over the base value from which appreciation under the SAR is to be measured. 

“Section 409A”: Section 409A of the Code and the regulations thereunder. 

“Section 422”: Section 422 of the Code and the regulations thereunder. 

“Stock”: Common stock of the Company, par value $0.001 per share. 

“Stock Option”: An option entitling the holder to acquire shares of Stock upon payment of the exercise price. 

“Stock Unit”: An unfunded and unsecured promise, denominated in shares of Stock, to deliver Stock or cash measured by the
value of Stock in the future. 
 “Substitute Awards”: Awards granted under the Plan in substitution for one or more equity
awards of an acquired company that are converted, replaced or adjusted in connection with the acquisition. 
 “Unrestricted
Stock”: Stock not subject to any restrictions under the terms of the Award. 

  
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