EX-10.3





 Exhibit 10.3 

ADAGIO THERAPEUTICS, INC. 

2021 EMPLOYEE STOCK PURCHASE PLAN 

ADOPTED BY THE BOARD OF DIRECTORS:
JULY 27, 2021 
 APPROVED BY THE STOCKHOLDERS:
JULY 29, 2021 
  

	1.	 GENERAL; PURPOSE. 



(a) The Plan provides a means by which Eligible Employees of the Company and certain Designated Companies may be given an opportunity to
purchase shares of Common Stock. The Plan permits the Company to grant a series of Purchase Rights to Eligible Employees under an Employee Stock Purchase Plan. In addition, the Plan permits the Company to grant a series of Purchase Rights to
Eligible Employees that do not meet the requirements of an Employee Stock Purchase Plan. 
 (b) The Plan includes two components: a
423 Component and a Non-423 Component. The Company intends (but makes no undertaking or representation to maintain) the 423 Component to qualify as an Employee Stock Purchase Plan. The provisions of the 423
Component, accordingly, will be construed in a manner that is consistent with the requirements of Section 423 of the Code. In addition, this Plan authorizes grants of Purchase Rights under the Non-423
Component that do not meet the requirements of an Employee Stock Purchase Plan. Except as otherwise provided in the Plan or determined by the Board, the Non-423 Component will operate and be administered in
the same manner as the 423 Component. In addition, the Company may make separate Offerings which vary in terms (provided that such terms are not inconsistent with the provisions of the Plan or the requirements of an Employee Stock Purchase Plan to
the extent the Offering is made under the 423 Component), and the Company will designate which Designated Company is participating in each separate Offering. 

(c) The Company, by means of the Plan, seeks to retain the services of Eligible Employees, to secure and retain the services of new
Employees and to provide incentives for such persons to exert maximum efforts for the success of the Company and its Related Corporations. 
  

	2.	 ADMINISTRATION. 



(a) The Board will administer the Plan unless and until the Board delegates administration of the Plan to a Committee or Committees, as
provided in Section 2(c). 
 (b) The Board will have the power, subject to, and within the limitations of, the express
provisions of the Plan: 
 (i) To determine how and when Purchase Rights will be granted and the provisions of each Offering (which
need not be identical). 
 (ii) To designate from time to time (A) which Related Corporations of the Company will be eligible to
participate in the Plan as Designated 423 Companies, (B) which Related Corporations or Affiliates will be eligible to participate in the Plan as Designated Non-423 Companies, (C) which Affiliates or
Related Corporations may be excluded from participation in the Plan, and (D) which Designated Companies will participate in each separate Offering (to the extent that the Company makes separate Offerings). 

(iii) To construe and interpret the Plan and Purchase Rights, and to establish, amend and revoke rules and regulations for its
administration. The Board, in the exercise of this power, may correct any defect, omission or inconsistency in the Plan, in a manner and to the extent it deems necessary or expedient to make the Plan fully effective. 

  
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 (iv) To settle all controversies regarding the Plan and Purchase Rights granted under
the Plan. 
 (v) To suspend or terminate the Plan at any time as provided in Section 12. 

(vi) To amend the Plan at any time as provided in Section 12. 

(vii) Generally, to exercise such powers and to perform such acts as it deems necessary or expedient to promote the best interests of
the Company and its Related Corporations and to carry out the intent that the Plan be treated as an Employee Stock Purchase Plan with respect to the 423 Component. 

(viii) To adopt such rules, procedures and sub-plans as are necessary or appropriate to permit
or facilitate participation in the Plan by Employees who are foreign nationals or employed or located outside the United States. Without limiting the generality of, and consistent with, the foregoing, the Board specifically is authorized to adopt
rules, procedures, and sub-plans regarding, without limitation, eligibility to participate in the Plan, the definition of eligible “earnings,” handling and making of Contributions, establishment of
bank or trust accounts to hold Contributions, payment of interest, conversion of local currency, obligations to pay payroll tax, determination of beneficiary designation requirements, withholding procedures and handling of share issuances, any of
which may vary according to applicable requirements, and which, if applicable to a Designated Non-423 Company, do not have to comply with the requirements of Section 423 of the Code. 

(c) The Board may delegate some or all of the administration of the Plan to a Committee or Committees. If administration is delegated
to a Committee, the Committee will have, in connection with the administration of the Plan, the powers theretofore possessed by the Board that have been delegated to the Committee, including the power to delegate to a subcommittee any of the
administrative powers the Committee is authorized to exercise (and references in this Plan and any applicable Offering Document to the Board will thereafter be to the Committee or subcommittee), subject, however, to such resolutions, not
inconsistent with the provisions of the Plan, as may be adopted from time to time by the Board. Further, to the extent not prohibited by Applicable Law, the Board or Committee may, from time to time, delegate some or all of its authority under the
Plan to one or more officers of the Company or other persons or groups of persons as it deems necessary, appropriate or advisable under conditions or limitations that it may set at or after the time of the delegation. The Board may retain the
authority to concurrently administer the Plan with the Committee and may, at any time, revest in the Board some or all of the powers previously delegated. Whether or not the Board has delegated administration of the Plan to a Committee, the Board
will have the final power to determine all questions of policy and expediency that may arise in the administration of the Plan. 

(d) All determinations, interpretations and constructions made by the Board in good faith will not be subject to review by any person
and will be final, binding and conclusive on all persons. 
  

	3.	 SHARES OF COMMON STOCK SUBJECT
TO THE PLAN. 


 (a) Subject to the provisions of Section 11(a)
relating to Capitalization Adjustments, the maximum number of shares of Common Stock that may be issued under the Plan will not exceed 1,342,773 shares of Common Stock, plus the number of shares of Common Stock that are automatically added on
January 1st of each year for a period of up to ten years, commencing on January 1, 2022 and ending on (and including) January 1, 2031, in an amount equal to the lesser of (x) one percent (1%) of the total number of


  
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shares of Common Stock outstanding on December 31st of the preceding calendar year, and (y) 2,685,546 shares of Common Stock. Notwithstanding the foregoing, the Board may act prior to the
first day of any calendar year to provide that there will be no January 1st increase in the share reserve for such calendar year or that the increase in the share reserve for such calendar year
will be a lesser number of shares of Common Stock than would otherwise occur pursuant to the preceding sentence. For the avoidance of doubt, up to the maximum number of shares of Common Stock reserved under this Section 3(a) may be used to
satisfy purchases of Common Stock under the 423 Component and any remaining portion of such maximum number of shares may be used to satisfy purchases of Common Stock under the Non-423 Component. 

(b) If any Purchase Right granted under the Plan terminates without having been exercised in full, the shares of Common Stock not
purchased under such Purchase Right will again become available for issuance under the Plan. 
 (c) The stock purchasable under the
Plan will be shares of authorized but unissued or reacquired Common Stock, including shares repurchased by the Company on the open market. 
  

	4.	 GRANT OF PURCHASE RIGHTS;
OFFERING. 


 (a) The Board may from time to time grant or provide for the grant of Purchase
Rights to Eligible Employees under an Offering (consisting of one or more Purchase Periods) on an Offering Date or Offering Dates selected by the Board. Each Offering will be in such form and will contain such terms and conditions as the Board will
deem appropriate, and with respect to the 423 Component, will comply with the requirement of Section 423(b)(5) of the Code that all Employees granted Purchase Rights will have the same rights and privileges. The terms and conditions of an
Offering shall be incorporated by reference into the Plan and treated as part of the Plan. The provisions of separate Offerings need not be identical, but each Offering will include (through incorporation of the provisions of this Plan by reference
in the document comprising the Offering or otherwise) the period during which the Offering will be effective, which period will not exceed 27 months beginning with the Offering Date, and the substance of the provisions contained in Sections 5
through 8, inclusive. 
 (b) If a Participant has more than one Purchase Right outstanding under the Plan, unless he or she otherwise
indicates in forms delivered to the Company or a third party designated by the Company (each, a “Company Designee”): (i) each form will apply to all of his or her Purchase Rights under the Plan, and (ii) a Purchase Right
with a lower exercise price (or an earlier-granted Purchase Right, if different Purchase Rights have identical exercise prices) will be exercised to the fullest possible extent before a Purchase Right with a higher exercise price (or a later-granted
Purchase Right if different Purchase Rights have identical exercise prices) will be exercised. 
 (c) The Board will have the
discretion to structure an Offering so that if the Fair Market Value of a share of Common Stock on the first Trading Day of a new Purchase Period within that Offering is less than or equal to the Fair Market Value of a share of Common Stock on the
Offering Date for that Offering, then (i) that Offering will terminate immediately as of that first Trading Day, and (ii) the Participants in such terminated Offering will be automatically enrolled in a new Offering beginning on the first
Trading Day of such new Purchase Period. 
  

	5.	 ELIGIBILITY. 



(a) Purchase Rights may be granted only to Employees of the Company or, as the Board may designate in accordance with Section 2(b),
to Employees of a Related Corporation or an Affiliate. Except as provided in Section 5(b) or as required by Applicable Law, an Employee will not be eligible to be granted Purchase Rights unless, on the Offering Date, the Employee has been in
the employ of the Company, the 

  
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Related Corporation or the Affiliate, as the case may be, for such continuous period preceding such Offering Date as the Board may (unless prohibited by Applicable Law) require, but in no event
will the required period of continuous employment be equal to or greater than two years. In addition, the Board may provide that no Employee will be eligible to be granted Purchase Rights under the Plan unless, on the Offering Date, such
Employee’s customary employment with the Company, the Related Corporation or the Affiliate is more than 20 hours per week and more than five months per calendar year or such other criteria as the Board may determine consistent with
Section 423 of the Code with respect to the 423 Component. The Board may also exclude from participation in the Plan or any Offering Employees who are “highly compensated employees” (within the meaning of Section 423(b)(4)(D) of
the Code) of the Company or a Related Corporation or a subset of such highly compensated employees. 
 (b) The Board may provide that
each person who, during the course of an Offering, first becomes an Eligible Employee will, on a date or dates specified in the Offering which coincides with the day on which such person becomes an Eligible Employee or which occurs thereafter,
receive a Purchase Right under that Offering, which Purchase Right will thereafter be deemed to be a part of that Offering. Such Purchase Right will have the same characteristics as any Purchase Rights originally granted under that Offering, as
described herein, except that: 
 (i) the date on which such Purchase Right is granted will be the “Offering Date” of such
Purchase Right for all purposes, including determination of the exercise price of such Purchase Right; 
 (ii) the period of the
Offering with respect to such Purchase Right will begin on its Offering Date and end coincident with the end of such Offering; and 

(iii) the Board may provide that if such person first becomes an Eligible Employee within a specified period of time before the end of
the Offering, he or she will not receive any Purchase Right under that Offering. 
 (c) No Employee will be eligible for the grant of
any Purchase Rights under the 423 Component if, immediately after any such Purchase Rights are granted, such Employee owns stock possessing five percent or more of the total combined voting power or value of all classes of stock of the Company or of
any Related Corporation. For purposes of this Section 5(c), the rules of Section 424(d) of the Code will apply in determining the stock ownership of any Employee, and stock which such Employee may purchase under all outstanding Purchase
Rights and options will be treated as stock owned by such Employee. 
 (d) As specified by Section 423(b)(8) of the Code, an
Eligible Employee may be granted Purchase Rights under the 423 Component only if such Purchase Rights, together with any other rights granted under all Employee Stock Purchase Plans of the Company and any Related Corporations, do not permit such
Eligible Employee’s rights to purchase stock of the Company or any Related Corporation to accrue at a rate which, when aggregated, exceeds $25,000 of Fair Market Value of such stock (determined at the time such rights are granted, and which,
with respect to the Plan, will be determined as of their respective Offering Dates) for each calendar year in which such rights are outstanding at any time. 

(e) Officers of the Company and any Designated Company, if they are otherwise Eligible Employees, will be eligible to participate in
Offerings under the Plan. Notwithstanding the foregoing, the Board may (unless prohibited by Applicable Law) provide in an Offering that Employees who are highly compensated Employees within the meaning of Section 423(b)(4)(D) of the Code will
not be eligible to participate. 

  
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 (f) Notwithstanding anything in this Section 5 to the contrary, in the case of
an Offering under the Non-423 Component, an Eligible Employee (or group of Eligible Employees) may be excluded from participation in the Plan or an Offering if the Board has determined, in its sole discretion,
that participation of such Eligible Employee(s) is not advisable or practical for any reason. 
  

	6.	 PURCHASE RIGHTS; PURCHASE PRICE.



 (a) On each Offering Date, each Eligible Employee, pursuant to an Offering made under the Plan, will be
granted a Purchase Right to purchase up to that number of shares of Common Stock purchasable either with a percentage of earnings or with a maximum dollar amount, as designated by the Board during the period that begins on the Offering Date (or such
later date as the Board determines for a particular Offering) and ends on the date stated in the Offering, which date will be no later than the end of the Offering. 

(b) The Board will establish one or more Purchase Dates during an Offering on which Purchase Rights granted for that Offering will be
exercised and shares of Common Stock will be purchased in accordance with such Offering. 
 (c) In connection with each Offering made
under the Plan, the Board may specify (i) a maximum number of shares of Common Stock that may be purchased by any Participant on any Purchase Date during such Offering, (ii) a maximum aggregate number of shares of Common Stock that may be
purchased by all Participants pursuant to such Offering and/or (iii) a maximum aggregate number of shares of Common Stock that may be purchased by all Participants on any Purchase Date under the Offering. If the aggregate purchase of shares of
Common Stock issuable upon exercise of Purchase Rights granted under the Offering would exceed any such maximum aggregate number, then, in the absence of any Board action otherwise, a pro rata (based on each Participant’s accumulated
Contributions) allocation of the shares of Common Stock (rounded down to the nearest whole share) available will be made in as nearly a uniform manner as will be practicable and equitable. 

(d) The purchase price of shares of Common Stock acquired pursuant to Purchase Rights will be specified by the Board prior to
commencement of an Offering and will not be less than the lesser of: 
 (i) an amount equal to 85% of the Fair Market Value of the
shares of Common Stock on the Offering Date; or 
 (ii) an amount equal to 85% of the Fair Market Value of the shares of Common Stock
on the applicable Purchase Date. 
  

	7.	 PARTICIPATION; WITHDRAWAL; TERMINATION.



 (a) An Eligible Employee may elect to participate in an Offering and authorize payroll deductions as the
means of making Contributions by completing and delivering to the Company or a Company Designee, within the time specified in the Offering, an enrollment form provided by the Company or Company Designee. The enrollment form will specify the amount
of Contributions not to exceed the maximum amount specified by the Board. Each Participant’s Contributions will be credited to a bookkeeping account for such Participant under the Plan and will be deposited with the general funds of the Company
except where Applicable Law requires that Contributions be deposited with a third party. If permitted in the Offering, a Participant may begin such Contributions with the first payroll occurring on or after the Offering Date (or, in the case of a
payroll date that occurs after the end of the prior Offering but before the Offering Date of the next new Offering, Contributions from such payroll will be included in the new Offering). If permitted in the Offering, a Participant may thereafter
reduce (including to zero) or 

  
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increase his or her Contributions. If required under Applicable Law or if specifically provided in the Offering and to the extent permitted by Section 423 of the Code with respect to the 423
Component, in addition to or instead of making Contributions by payroll deductions, a Participant may make Contributions through payment by cash, check or wire transfer prior to a Purchase Date. 

(b) During an Offering, a Participant may cease making Contributions and withdraw from the Offering by delivering to the Company or a
Company Designee a withdrawal form provided by the Company. The Company may impose a deadline before a Purchase Date for withdrawing. Upon such withdrawal, such Participant’s Purchase Right in that Offering will immediately terminate and the
Company will distribute as soon as practicable to such Participant all of his or her accumulated but unused Contributions and such Participant’s Purchase Right in that Offering shall thereupon terminate. A Participant’s withdrawal from
that Offering will have no effect upon his or her eligibility to participate in any other Offerings under the Plan, but such Participant will be required to deliver a new enrollment form to participate in subsequent Offerings. 

(c) Unless otherwise required by Applicable Law, Purchase Rights granted pursuant to any Offering under the Plan will terminate
immediately if the Participant either (i) is no longer an Employee for any reason or for no reason (subject to any post-employment participation period required by Applicable Law) or (ii) is otherwise no longer eligible to participate. The
Company will distribute as soon as practicable to such individual all of his or her accumulated but unused Contributions. 
 (d)
Unless otherwise determined by the Board, a Participant whose employment transfers or whose employment terminates with an immediate rehire (with no break in service) by or between the Company and a Designated Company or between Designated Companies
will not be treated as having terminated employment for purposes of participating in the Plan or an Offering; however, 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 Purchase Right will be qualified under the 423 Component only to the extent 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 Purchase Right will remain non-qualified under the Non-423 Component. The Board may establish different and additional rules governing transfers between separate Offerings within the 423 Component and between Offerings under the 423 Component and Offerings under the
Non-423 Component. 
 (e) During a Participant’s lifetime, Purchase Rights will be
exercisable only by such Participant. Purchase Rights are not transferable by a Participant, except by will, by the laws of descent and distribution, or, if permitted by the Company, by a beneficiary designation as described in Section 10. 

(f) Unless otherwise specified in the Offering or as required by Applicable Law, the Company will have no obligation to pay interest on
Contributions. 
  

	8.	 EXERCISE OF PURCHASE RIGHTS.



 (a) On each Purchase Date, each Participant’s accumulated Contributions will be applied to the purchase
of shares of Common Stock, up to the maximum number of shares of Common Stock permitted by the Plan and the applicable Offering, at the purchase price specified in the Offering. No fractional shares will be issued unless specifically provided for in
the Offering. 
 (b) Unless otherwise provided in the Offering, if any amount of accumulated Contributions remains in a
Participant’s account after the purchase of shares of Common Stock and such remaining amount is less than the amount required to purchase one share of Common Stock on the final Purchase Date of an Offering, then such remaining amount will be
held in such Participant’s account for the purchase of 

  
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shares of Common Stock under the next Offering under the Plan, unless such Participant withdraws from or is not eligible to participate in such next Offering, in which case such amount will be
distributed to such Participant after the final Purchase Date without interest (unless the payment of interest is otherwise required by Applicable Law). If the amount of Contributions remaining in a Participant’s account after the purchase of
shares of Common Stock is at least equal to the amount required to purchase one (1) whole share of Common Stock on the final Purchase Date of an Offering, then such remaining amount will be distributed in full to such Participant after the
final Purchase Date of such Offering without interest (unless otherwise required by Applicable Law). 
 (c) No Purchase Rights may be
exercised to any extent unless the shares of Common Stock to be issued upon such exercise under the Plan are covered by an effective registration statement pursuant to the Securities Act and the Plan is in material compliance with all applicable
U.S. federal and state, foreign and other securities, exchange control and other laws applicable to the Plan. If on a Purchase Date the shares of Common Stock are not so registered or the Plan is not in such compliance, no Purchase Rights will be
exercised on such Purchase Date, and, subject to Section 423 of the Code with respect to the 423 Component, the Purchase Date will be delayed until the shares of Common Stock are subject to such an effective registration statement and the Plan
is in material compliance, except that the Purchase Date will in no event be more than 27 months from the Offering Date. If, on the Purchase Date, as delayed to the maximum extent permissible, the shares of Common Stock are not registered and the
Plan is not in material compliance with all Applicable Laws, as determined by the Company in its sole discretion, no Purchase Rights will be exercised and all accumulated but unused Contributions will be distributed to the Participants without
interest (unless the payment of interest is otherwise required by Applicable Law). 
  

	9.	 COVENANTS OF THE COMPANY.



 The Company will seek to obtain from each U.S. federal or state, foreign or other regulatory commission, agency or
other Governmental Body having jurisdiction over the Plan such authority as may be required to grant Purchase Rights and issue and sell shares of Common Stock thereunder unless the Company determines, in its sole discretion, that doing so is not
practical or would cause the Company to incur costs that are unreasonable. If, after commercially reasonable efforts, the Company is unable to obtain the authority that counsel for the Company deems necessary for the grant of Purchase Rights or the
lawful issuance and sale of Common Stock under the Plan, and at a commercially reasonable cost, the Company will be relieved from any liability for failure to grant Purchase Rights and/or to issue and sell Common Stock upon exercise of such Purchase
Rights. 
  

	10.	 DESIGNATION OF BENEFICIARY. 



(a) The Company may, but is not obligated to, permit a Participant to submit a form designating a beneficiary who will receive any
shares of Common Stock and/or Contributions from the Participant’s account under the Plan if the Participant dies before such shares and/or Contributions are delivered to the Participant. The Company may, but is not obligated to, permit the
Participant to change such designation of beneficiary. Any such designation and/or change must be on a form approved by the Company. 

(b) If a Participant dies, and in the absence of a valid beneficiary designation, the Company will deliver any shares of Common Stock
and/or Contributions to the executor or administrator of the estate of the Participant. If no executor or administrator has been appointed (to the knowledge of the Company), the Company, in its sole discretion, may deliver such shares of Common
Stock and/or Contributions, without interest (unless the payment of interest is otherwise required by Applicable Law), to the Participant’s spouse, dependents or relatives, or if no spouse, dependent or relative is known to the Company, then to
such other person as the Company may designate. 

  
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	11.	 ADJUSTMENTS UPON CHANGES IN
COMMON STOCK; CORPORATE TRANSACTIONS. 


 (a) In the
event of a Capitalization Adjustment, the Board will appropriately and proportionately adjust: (i) the class(es) and maximum number of securities subject to the Plan pursuant to Section 3(a), (ii) the class(es) and maximum number of
securities by which the share reserve is to increase automatically each year pursuant to Section 3(a), (iii) the class(es) and number of securities subject to, and the purchase price applicable to outstanding Offerings and Purchase Rights, and
(iv) the class(es) and number of securities that are the subject of the purchase limits under each ongoing Offering. The Board will make these adjustments, and its determination will be final, binding and conclusive. 

(b) In the event of a Corporate Transaction, then: (i) any surviving corporation or acquiring corporation (or the surviving or
acquiring corporation’s parent company) may assume or continue outstanding Purchase Rights or may substitute similar rights (including a right to acquire the same consideration paid to the stockholders in the Corporate Transaction) for
outstanding Purchase Rights, or (ii) if any surviving or acquiring corporation (or its parent company) does not assume or continue such Purchase Rights or does not substitute similar rights for such Purchase Rights, then the
Participants’ accumulated Contributions will be used to purchase shares of Common Stock (rounded down to the nearest whole share) within ten business days (or such other period specified by the Board) prior to the Corporate Transaction under
the outstanding Purchase Rights, and the Purchase Rights will terminate immediately after such purchase. 
  

	12.	 AMENDMENT, TERMINATION OR SUSPENSION
OF THE PLAN. 


 (a) The Board may amend the Plan at any time in any
respect the Board deems necessary or advisable. However, except as provided in Section 11(a) relating to Capitalization Adjustments, stockholder approval will be required for any amendment of the Plan for which stockholder approval is required
by Applicable Law. 
 (b) The Board may suspend or terminate the Plan at any time. No Purchase Rights may be granted under the Plan
while the Plan is suspended or after it is terminated. 
 (c) Any benefits, privileges, entitlements and obligations under any
outstanding Purchase Rights granted before an amendment, suspension or termination of the Plan will not be materially impaired by any such amendment, suspension or termination except (i) with the consent of the person to whom such Purchase
Rights were granted, (ii) as necessary to facilitate compliance with any laws, listing requirements, or governmental regulations (including, without limitation, the provisions of Section 423 of the Code and the regulations and other
interpretive guidance issued thereunder relating to Employee Stock Purchase Plans) including without limitation any such regulations or other guidance that may be issued or amended after the date the Plan is adopted by the Board, or (iii) as
necessary to obtain or maintain favorable tax, listing, or regulatory treatment. To be clear, the Board may amend outstanding Purchase Rights without a Participant’s consent if such amendment is necessary to ensure that the Purchase Right
and/or the Plan complies with the requirements of Section 423 of the Code with respect to the 423 Component or with respect to other Applicable Laws. Notwithstanding anything in the Plan or any Offering Document to the contrary, the Board will
be entitled to: (i) establish the exchange ratio applicable to amounts withheld in a currency other than U.S. dollars; (ii) permit Contributions in excess of the amount designated by a Participant in order to adjust for mistakes in the
Company’s processing of properly completed Contribution elections; (iii) establish reasonable waiting and adjustment periods and/or accounting and crediting procedures to ensure that amounts applied toward the purchase of Common Stock for
each Participant properly correspond with amounts withheld from the Participant’s Contributions; (iv) amend any outstanding Purchase Rights or clarify any ambiguities regarding the terms of any Offering to enable the Purchase Rights to
qualify under and/or comply with Section 423 of the Code with respect to the 423 

  
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Component; and (v) establish other limitations or procedures as the Board determines in its sole discretion advisable that are consistent with the Plan. The actions of the Board pursuant to
this paragraph will not be considered to alter or impair any Purchase Rights granted under an Offering as they are part of the initial terms of each Offering and the Purchase Rights granted under each Offering. 

 

	13.	 TAX QUALIFICATION; TAX WITHHOLDING.



 (a) Although the Company may endeavor to (i) qualify a Purchase Right for special tax treatment under
the laws of the United States or jurisdictions outside of the United States or (ii) avoid adverse tax treatment, the Company makes no representation to that effect and expressly disavows any covenant to maintain special or to avoid unfavorable
tax treatment, notwithstanding anything to the contrary in this Plan. The Company will be unconstrained in its corporate activities without regard to the potential negative tax impact on Participants. 

(b) Each Participant will make arrangements, satisfactory to the Company and any applicable Related Corporation, to enable the Company
or the Related Corporation to fulfill any withholding obligation for Tax-Related Items. Without limitation to the foregoing, in the Company’s sole discretion and subject to Applicable Law, such
withholding obligation may be satisfied in whole or in part by (i) withholding from the Participant’s salary or any other cash payment due to the Participant from the Company or a Related Corporation; (ii) withholding from the
proceeds of the sale of shares of Common Stock acquired under the Plan, either through a voluntary sale or a mandatory sale arranged by the Company; or (iii) any other method deemed acceptable by the Board. The Company shall not be required to
issue any shares of Common Stock under the Plan until such obligations are satisfied. 
 (c) The 423 Component is exempt from the
application of Section 409A of the Code, and any ambiguities herein shall be interpreted to so be exempt from Section 409A of the Code. The Non-423 Component is intended to be exempt from the
application of Section 409A of the Code under the short-term deferral exception and any ambiguities shall be construed and interpreted in accordance with such intent. In furtherance of the foregoing and notwithstanding any provision in the Plan
to the contrary, if the Committee determines that an option granted under the Plan may be subject to Section 409A of the Code or that any provision in the Plan would cause an option under the Plan to be subject to Section 409A, the
Committee may amend the terms of the Plan and/or of an outstanding option granted under the Plan, or take such other action the Committee determines is necessary or appropriate, in each case, without the participant’s consent, to exempt any
outstanding option or future option that may be granted under the Plan from or to allow any such options to comply with Section 409A of the Code, but only to the extent any such amendments or action by the Committee would not violate
Section 409A of the Code. Notwithstanding the foregoing, the Company shall have no liability to a participant or any other party if the option under the Plan that is intended to be exempt from or compliant with Section 409A of the Code is
not so exempt or compliant or for any action taken by the Committee with respect thereto. 
  

	14.	 EFFECTIVE DATE OF PLAN.



 The Plan will become effective immediately prior to and contingent upon the IPO Date. No Purchase Rights will be
exercised unless and until the Plan has been approved by the stockholders of the Company, which approval must be within 12 months before or after the date the Plan is adopted (or if required under Section 12(a) above, materially amended) by the
Board. 
  

	15.	 MISCELLANEOUS PROVISIONS. 



(a) Proceeds from the sale of shares of Common Stock pursuant to Purchase Rights will constitute general funds of the Company. 

  
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 (b) A Participant will not be deemed to be the holder of, or to have any of the
rights of a holder with respect to, shares of Common Stock subject to Purchase Rights unless and until the Participant’s shares of Common Stock acquired upon exercise of Purchase Rights are recorded in the books of the Company (or its transfer
agent). 
 (c) The Plan and Offering do not constitute an employment contract. Nothing in the Plan or in the Offering will in any way
alter the at will nature of a Participant’s employment or amend a Participant’s employment contract, if applicable, or be deemed to create in any way whatsoever any obligation on the part of any Participant to continue in the employ of the
Company or a Related Corporation or an Affiliate, or on the part of the Company, a Related Corporation or an Affiliate to continue the employment of a Participant. 

(d) The provisions of the Plan will be governed by the laws of the State of Delaware without resort to that state’s conflicts of
laws rules. 
 (e) If any particular provision of the Plan is found to be invalid or otherwise unenforceable, such provision will not
affect the other provisions of the Plan, but the Plan will be construed in all respects as if such invalid provision were omitted. 

(f) If any provision of the Plan does not comply with Applicable Law, such provision shall be construed in such a manner as to comply
with Applicable Law. 
  

	16.	 DEFINITIONS. 



As used in the Plan, the following definitions will apply to the capitalized terms indicated below: 

(a) “423 Component” means the part of the Plan, which excludes the
Non-423 Component, pursuant to which Purchase Rights that satisfy the requirements for an Employee Stock Purchase Plan may be granted to Eligible Employees. 

(b) “Affiliate” means any entity, other than a Related Corporation, whether now or subsequently established,
which is at the time of determination, a “parent” or “subsidiary” of the Company as such terms are defined in Rule 405 promulgated under the Securities Act. The Board may determine the time or times at which “parent” or
“subsidiary” status is determined within the foregoing definition. 
 (c) “Applicable Law” means
shall mean the Code and any applicable securities, federal, state, foreign, material local or municipal or other law, statute, constitution, principle of common law, resolution, ordinance, code, edict, decree, rule, listing rule, regulation,
judicial decision, ruling or requirement issued, enacted, adopted, promulgated, implemented or otherwise put into effect by or under the authority of any Governmental Body (or under the authority of the New York Stock Exchange, NASDAQ Stock Market
or the Financial Industry Regulatory Authority). 
 (d) “Board” means the Board of Directors of the
Company. 
 (e) “Capitalization Adjustment” means any change that is made in, or other events that occur with
respect to, the Common Stock subject to the Plan or subject to any Purchase Right after the date the Plan is adopted by the Board without the receipt of consideration by the Company through merger, consolidation, reorganization, recapitalization,
reincorporation, stock dividend, dividend in property other than cash, large nonrecurring cash dividend, stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure or other similar equity
restructuring transaction, as that term is used in Financial Accounting Standards Board Accounting Standards Codification Topic 718 (or any successor thereto). Notwithstanding the foregoing, the conversion of any convertible securities of the
Company will not be treated as a Capitalization Adjustment. 

  
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 (f) “Code” means the U.S. Internal Revenue Code of
1986, as amended, including any applicable regulations and guidance thereunder. 
 (g) “Committee”
means a committee of one or more members of the Board to whom authority has been delegated by the Board in accordance with Section 2(c). 

(h) “Common Stock” means the common stock of the Company. 

(i) “Company” means Adagio Therapeutics, Inc., a Delaware corporation. 

(j) “Contributions” means the payroll deductions and other additional payments specifically provided for in the
Offering that a Participant contributes to fund the exercise of a Purchase Right. A Participant may make additional payments into his or her account if specifically provided for in the Offering, and then only if the Participant has not already had
the maximum permitted amount withheld during the Offering through payroll deductions and, with respect to the 423 Component, to the extent permitted by Section 423. 

(k) “Corporate Transaction” means the consummation, in a single transaction or in a series of related
transactions, of any one or more of the following events: 
 (i) a sale or other disposition of all or substantially all, as
determined by the Board in its sole discretion, of the consolidated assets of the Company and its subsidiaries; 
 (ii) a sale or
other disposition of more than 50% of the outstanding securities of the Company; 
 (iii) a merger, consolidation or similar
transaction following which the Company is not the surviving corporation; or 
 (iv) a merger, consolidation or similar transaction
following which the Company is the surviving corporation but the shares of Common Stock outstanding immediately preceding the merger, consolidation or similar transaction are converted or exchanged by virtue of the merger, consolidation or similar
transaction into other property, whether in the form of securities, cash or otherwise. 
 (l) “Designated 423
Company” means any Related Corporation selected by the Board as participating in the 423 Component. 
 (m)
“Designated Company” means any Designated Non-423 Corporation or Designated 423 Company, provided, however, that at any given time, a Related Corporation participating in the 423
Component shall not be a Related Corporation participating in the Non-423 Component. 
 (n)
“Designated Non-423 Company” means any Related Corporation or Affiliate selected by the Board as participating in the Non-423 Component. 

(o) “Director” means a member of the Board. 

  
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 (p) “Eligible Employee” means an Employee who meets
the requirements set forth in the document(s) governing the Offering for eligibility to participate in the Offering, provided that such Employee also meets the requirements for eligibility to participate set forth in the Plan. 

(q) “Employee” means any person, including an Officer or Director, who is “employed” for
purposes of Section 423(b)(4) of the Code by the Company or a Related Corporation or solely with respect to the Non-423 Component, an Affiliate. However, service solely as a Director, or payment of a fee
for such services, will not cause a Director to be considered an “Employee” for purposes of the Plan. 
 (r)
“Employee Stock Purchase Plan” means a plan that grants Purchase Rights intended to be options issued under an “employee stock purchase plan,” as that term is defined in Section 423(b) of the Code. 

(s) “Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended and the rules and
regulations promulgated thereunder. 
 (t) “Fair Market Value” means, as of any date, the value of the Common
Stock determined as follows: 
 (i) If the Common Stock is listed on any established stock exchange or traded on any established
market, the Fair Market Value of a share of Common Stock will be, unless otherwise determined by the Board, the closing sales price for such stock as quoted on such exchange or market (or the exchange or market with the greatest volume
of trading in the Common Stock) on the date of determination, as reported in such source as the Board deems reliable. Unless otherwise provided by the Board, if there is no closing sales price for the Common Stock on the date of
determination, then the Fair Market Value will be the closing sales price on the last preceding date for which such quotation exists. 

(ii) In the absence of such markets for the Common Stock, the Fair Market Value will be determined by the Board in good faith in
compliance with Applicable Laws and regulations and, to the extent applicable as determined in the sole discretion of the Board, in a manner that complies with Sections 409A of the Code 

(iii) Notwithstanding the foregoing, for any Offering that commences on the IPO Date, the Fair Market Value of the shares of Common
Stock on the Offering Date will be the price per share at which shares are first sold to the public in the Company’s initial public offering as specified in the final prospectus for that initial public offering. 

(u) “Governmental Body” means any: (a) nation, state, commonwealth, province,
territory, county, municipality, district or other jurisdiction of any nature; (b) federal, state, local, municipal, foreign or other government; (c) governmental or regulatory body, or quasi-governmental body of any nature (including any
governmental division, department, administrative agency or bureau, commission, authority, instrumentality, official, ministry, fund, foundation, center, organization, unit, body or entity and any court or other tribunal, and for the avoidance of
doubt, any tax authority) or other body exercising similar powers or authority; or (d) self-regulatory organization (including the New York Stock Exchange, the NASDAQ Stock Market and the Financial Industry Regulatory Authority). 

(v) “IPO Date” means the date of the underwriting agreement between the Company and the underwriter(s) managing
the initial public offering of the Common Stock, pursuant to which the Common Stock is priced for the initial public offering. 

  
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 (w) “Non-423 Component” means the
part of the Plan, which excludes the 423 Component, pursuant to which Purchase Rights that are not intended to satisfy the requirements for an Employee Stock Purchase Plan may be granted to Eligible Employees. 

(x) “Offering” means the grant to Eligible Employees of Purchase Rights, with the exercise of those
Purchase Rights automatically occurring at the end of one or more Purchase Periods. The terms and conditions of an Offering will generally be set forth in the “Offering Document” approved by the Board for that Offering. 

(y) “Offering Date” means a date selected by the Board for an Offering to commence. 

(z) “Officer” means a person who is an officer of the Company or a Related Corporation within the
meaning of Section 16 of the Exchange Act. 
 (aa) “Participant” means an Eligible Employee who
holds an outstanding Purchase Right. 
 (bb) “Plan” means this Adagio Therapeutics, Inc. 2021 Employee
Stock Purchase Plan, as amended from time to time, including both the 423 Component and the Non-423 Component. 

(cc) “Purchase Date” means one or more dates during an Offering selected by the Board on which Purchase
Rights will be exercised and on which purchases of shares of Common Stock will be carried out in accordance with such Offering. 

(dd) “Purchase Period” means a period of time specified within an Offering, generally beginning on the Offering
Date or on the first Trading Day following a Purchase Date, and ending on a Purchase Date. An Offering may consist of one or more Purchase Periods. 

(ee) “Purchase Right” means an option to purchase shares of Common Stock granted pursuant to the Plan.

 (ff) “Related Corporation” means any “parent corporation” or “subsidiary
corporation” of the Company whether now or subsequently established, as those terms are defined in Sections 424(e) and (f), respectively, of the Code. 

(gg) “Securities Act” means the U.S. Securities Act of 1933, as amended. 

(hh) “Tax-Related Items” means any income tax, social insurance,
payroll tax, fringe benefit tax, payment on account or other tax-related items arising out of or in relation to a Participant’s participation in the Plan, including, but not limited to, the exercise of a
Purchase Right and the receipt of shares of Common Stock or the sale or other disposition of shares of Common Stock acquired under the Plan. 

(ii) “Trading Day” means any day on which the exchange(s) or market(s) on which shares of Common Stock
are listed, including but not limited to the New York Stock Exchange, Nasdaq Global Select Market, the Nasdaq Global Market, the Nasdaq Capital Market or any successors thereto, is open for trading. 

  
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