EX-10.1





 Exhibit 10.1 

ADAGIO THERAPEUTICS, INC. 

2020 EQUITY INCENTIVE PLAN 

ARTICLE I. 
 PURPOSE.

 The purpose of the Plan is to advance the interests of the Company’s stockholders by enhancing the Company’s ability to
attract, retain and motivate persons who make (or are expected to make) important contributions to the Company by providing such persons with equity ownership opportunities and thereby better aligning the interests of such persons with those of the
Company’s stockholders. Capitalized terms used in the Plan are defined in Article XI below. 
 ARTICLE II. 

ELIGIBILITY. 
 Service
Providers are eligible to be granted Awards under the Plan, subject to the limitations described herein. 
 ARTICLE III. 

ADMINISTRATION AND DELEGATION. 

3.1 Administration. The Plan will be administered by the Administrator. The Administrator shall have authority to determine which
Service Providers will receive Awards, to grant Awards and to set all terms and conditions of Awards (including, but not limited to, vesting, exercise and forfeiture provisions). In addition, the Administrator shall have the authority to take all
actions and make all determinations contemplated by the Plan and to adopt, amend and repeal such administrative rules, guidelines and practices relating to the Plan as it shall deem advisable. The Administrator may correct any defect or ambiguity,
supply any omission or reconcile any inconsistency in the Plan or any Award in the manner and to the extent it shall deem necessary or appropriate to carry the Plan and any Awards into effect, as determined by the Administrator. The Administrator
shall make all determinations under the Plan in the Administrator’s sole discretion and all such determinations shall be final and binding on all persons having or claiming any interest in the Plan or in any Award. 

3.2 Appointment of Committees. To the extent permitted by Applicable Laws, the Board may delegate any or all of its powers under
the Plan to one or more Committees. The Board may abolish any Committee at any time and re-vest in itself any previously delegated authority. 

ARTICLE IV. 
 STOCK
AVAILABLE FOR AWARDS. 
 4.1 Number of Shares. Subject to adjustment under Article VIII hereof, Awards may be made under
the Plan covering up to 1,985,294 shares of Common Stock. If any Award expires or lapses or is terminated, surrendered or canceled without having been fully exercised or is forfeited in whole or in part (including, without limitation, as the result
of shares of Common Stock subject to such Award being repurchased by the Company at or below the original issuance price), in any case in a manner that results in any shares of Common Stock covered by such Award not being issued or being so
reacquired by the Company, the unused Common Stock covered by such Award shall again be available for the grant of Awards under the Plan. Further, shares of Common Stock delivered (either by actual delivery or attestation) to the Company by a
Participant to satisfy the applicable exercise or purchase price of an Award and/or to satisfy any applicable tax withholding obligation (including, without limitation, shares retained by the 












 Company from the Award being exercised or purchased and/or creating the tax obligation) shall be added to
the number of shares of Common Stock available for the grant of Awards under the Plan. However, in the case of Incentive Stock Options, the foregoing provisions shall be subject to any limitations under the Code. Shares of Common Stock issued under
the Plan may consist in whole or in part of authorized but unissued shares, shares purchased on the open market or treasury shares.     

4.2 Substitute Awards. In connection with a merger or consolidation of an entity with the Company or the acquisition by the Company of
property or stock of an entity, the Administrator may grant Awards in substitution for any options or other stock or stock-based awards granted prior to such merger or consolidation by such entity or an affiliate thereof. Substitute Awards may be
granted on such terms as the Administrator deems appropriate in the circumstances, notwithstanding any limitations on Awards contained in the Plan. Substitute Awards shall not count against the overall share limit set forth in Section 4.1
hereof, except as may be required by reason of Section 422 of the Code.     
 ARTICLE V. 

STOCK OPTIONS. 
 5.1
General. The Administrator may grant Options to any Service Provider, subject to the limitations on Incentive Stock Options described below. The Administrator shall determine the number of shares of Common Stock to be covered by each Option,
the exercise price of each Option and the conditions and limitations applicable to the exercise of each Option, including, without limitation, conditions relating to Applicable Laws, as it considers necessary or advisable. 

5.2 Incentive Stock Options. The Administrator may grant Options intended to qualify as Incentive Stock Options only to employees of
the Company, any of the Company’s present or future “parent corporations” or “subsidiary corporations” as defined in Sections 424(e) or (f) of the Code, respectively, and any other entities the employees of which are
eligible to receive Incentive Stock Options under the Code. All Options intended to qualify as Incentive Stock Options shall be subject to and shall be construed consistently with the requirements of Section 422 of the Code. Neither the Company
nor the Administrator shall have any liability to a Participant, or any other party, (i) if an Option (or any part thereof) which is intended to qualify as an Incentive Stock Option fails to qualify as an Incentive Stock Option or (ii) for
any action or omission by the Administrator that causes an Option not to qualify as an Incentive Stock Option, including, without limitation, the conversion of an Incentive Stock Option to a Non-Qualified
Stock Option or the grant of an Option intended as an Incentive Stock Option that fails to satisfy the requirements under the Code applicable to an Incentive Stock Option. Any Option that is intended to qualify as an Incentive Stock Option, but
fails to so qualify for any reason, including, without limitation, the portion of any Option becoming exercisable in excess of the $100,000 limitation described in Treasury Regulation Section 1.422-4,
shall be treated as a Non-Qualified Stock Option for all purposes. 
 5.3 Exercise Price. The
Administrator shall establish the exercise price of each Option and specify the exercise price in the applicable Award Agreement. The exercise price shall be not less than 100% of the Fair Market Value on the date the Option is granted. In the case
of an Incentive Stock Option granted to an employee who, at the time of grant of the Option, owns (or is treated as owning under Section 424 of the Code) stock representing more than 10% of the voting power of all classes of stock of the
Company (or a “parent corporation” or “subsidiary corporation” thereof within the meaning of Sections 424(e) or 424(f) of the Code, respectively), the per share exercise price shall be no less than 110% of the Fair Market Value
on the date the Option is granted. 

  
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 5.4 Duration of Options. Each Option shall be exercisable at such times and subject
to such terms and conditions as the Administrator may specify in the applicable Award Agreement, provided that the term of any Option shall not exceed ten years. In the case of an Incentive Stock Option granted to an employee who, at the time of
grant of the Option, owns (or is treated as owning under Section 424 of the Code) stock representing more than 10% of the voting power of all classes of stock of the Company (or a “parent corporation” or “subsidiary
corporation” thereof within the meaning of Sections 424(e) or 424(f) of the Code, respectively), the term of the Option shall not exceed five years. 

5.5 Exercise of Option; Notification of Disposition. Options may be exercised by delivery to the Company of a written notice of
exercise, in a form approved by the Administrator (which may be an electronic form), signed by the person authorized to exercise the Option, together with payment in full (i) as specified in Section 5.6 hereof for the number of shares for
which the Option is exercised and (ii) as specified in Section 9.5 hereof for any applicable withholding taxes. Unless otherwise determined by the Administrator, an Option may not be exercised for a fraction of a share of Common Stock. If
an Option is designated as an Incentive Stock Option, the Participant shall give prompt notice to the Company of any disposition or other transfer of any shares of Common Stock acquired from the Option if such disposition or transfer is made
(i) within two years from the grant date with respect to such Option or (ii) within one year after the transfer of such shares to the Participant (other than any such disposition made in connection with a Change in Control). Such notice
shall specify the date of such disposition or other transfer and the amount realized, in cash, other property, assumption of indebtedness or other consideration, by the Participant in such disposition or other transfer. 

5.6 Payment Upon Exercise. Common Stock purchased upon the exercise of an Option granted under the Plan shall be paid for in
cash, by wire transfer of immediately available funds or by check, payable to the order of the Company, or, subject to Section 10.8, any Company insider trading policy (including, without limitation, any blackout periods) and Applicable Laws,
by: 
 (a) If the Company is a Publicly Listed Company, unless the Administrator otherwise determines, (A) delivery of an
irrevocable and unconditional undertaking by a broker acceptable to the Company to deliver promptly to the Company sufficient funds to pay the exercise price, or (B) delivery by the Participant to the Company of a copy of irrevocable and
unconditional instructions to a broker acceptable to the Company to deliver promptly to the Company cash or a check sufficient to pay the exercise price, provided in either case, that such amount is paid to the Company at such time as may be
required by the Administrator; 
 (b) to the extent permitted by the Administrator, delivery (either by actual delivery or attestation)
of shares of Common Stock owned by the Participant valued at their Fair Market Value, provided (A) such method of payment is then permitted under Applicable Laws, (B) such Common Stock, if acquired directly from the Company, was owned by
the Participant for such minimum period of time, if any, as may be established by the Company at any time, and (C) such Common Stock is not subject to any repurchase, forfeiture, unfulfilled vesting or other similar requirements; 

(c) to the extent permitted by the Administrator, surrendering shares of Common Stock then issuable upon exercise of the Option valued at
their Fair Market Value on the date of exercise; 
 (d) to the extent permitted by the Administrator, delivery of a promissory note of
the Participant to the Company on terms determined by the Administrator; 
 (e) to the extent permitted by the Administrator, delivery
of property of any other kind which constitutes good and valuable consideration as determined by the Administrator; or 
 (f) any
combination of the above permitted forms of payment (including, without limitation, cash or check). 

  
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 5.7 Early Exercise of Options. The Administrator may provide in the terms of an Award
Agreement that the Service Provider may exercise an Option in whole or in part prior to the full vesting of the Option in exchange for unvested shares of Restricted Stock with respect to any unvested portion of the Option so exercised. Shares of
Restricted Stock acquired upon the exercise of any unvested portion of an Option shall be subject to such terms and conditions as the Administrator shall determine. 

ARTICLE VI. 
 RESTRICTED
STOCK; RESTRICTED STOCK UNITS. 
 6.1 General. The Administrator may grant Restricted Stock, or the right to purchase Restricted
Stock, to any Service Provider, subject to the right of the Company to repurchase all or part of such shares at their issue price or other stated or formula price from the Participant (or to require forfeiture of such shares if issued at no cost) in
the event that conditions specified by the Administrator in the applicable Award Agreement are not satisfied prior to the end of the applicable restriction period or periods established by the Administrator for such Award. In addition, the
Administrator may grant to Service Providers Restricted Stock Units, which may be subject to vesting and forfeiture conditions during applicable restriction period or periods, as set forth in an applicable Award Agreement. 

6.2 Terms and Conditions for All Restricted Stock and Restricted Stock Unit Awards. The Administrator shall determine and set forth in
the applicable Award Agreement the terms and conditions applicable to each Restricted Stock and Restricted Stock Unit Award, including, without limitation, the conditions for vesting and repurchase (or forfeiture) and the issue price, in each case,
if any. 
 6.3 Additional Provisions Relating to Restricted Stock. 

(a) Dividends. Participants holding shares of Restricted Stock will be entitled to all ordinary cash dividends paid with respect to
such shares to the extent such dividends have a record date that is on or after the date on which the Participant to whom such Restricted Stock is granted becomes the record holder of such Restricted Stock, unless otherwise provided by the
Administrator in the applicable Award Agreement. In addition, unless otherwise provided by the Administrator, if any dividends or distributions are paid in shares, or consist of a dividend or distribution to holders of Common Stock of property other
than an ordinary cash dividend, the shares or other property will be subject to the same restrictions on transferability and forfeitability as the shares of Restricted Stock with respect to which they were paid. Each dividend payment will be made as
provided in the applicable Award Agreement, but in no event later than the end of the calendar year in which the dividends are paid to stockholders of that class of stock or, if later, the 15th day of the third month following the later of
(A) the date the dividends are paid to stockholders of that class of stock, and (B) the date the dividends are no longer subject to forfeiture. 

(b) Stock Certificates. The Company may require that any stock certificates issued in respect of shares of Restricted Stock be
deposited in escrow by the Participant, together with a stock power endorsed in blank, with the Company (or its designee). 
 6.4
Additional Provisions Relating to Restricted Stock Units. 
 (a) Settlement. Upon the vesting of a Restricted Stock Unit, the
Participant shall be entitled to receive from the Company one share of Common Stock or an amount of cash or other property equal to the Fair Market Value of one share of Common Stock on the settlement date, as the Administrator shall determine and
as provided in the applicable Award Agreement. The Administrator may provide that settlement of Restricted Stock Units shall occur upon or as soon as reasonably practicable after the vesting of the Restricted Stock Units or shall instead be
deferred, on a mandatory basis or at the election of the Participant, in a manner that complies with Section 409A. 

  
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 (b) Voting Rights. A Participant shall have no voting rights with respect to any
Restricted Stock Units unless and until shares are delivered in settlement thereof. 
 (c) Dividend Equivalents. To the extent
provided by the Administrator, a grant of Restricted Stock Units may provide a Participant with the right to receive Dividend Equivalents. Dividend Equivalents may be paid currently or credited to an account for the Participant, may be settled in
cash and/or shares of Common Stock and may be subject to the same restrictions on transfer and forfeitability as the Restricted Stock Units with respect to which the Dividend Equivalents are paid, as determined by the Administrator, subject, in each
case, to such terms and conditions as the Administrator shall establish and set forth in the applicable Award Agreement. 
 ARTICLE VII.

 OTHER STOCK-BASED AWARDS. 

Other Stock-Based Awards may be granted hereunder to Participants, including, without limitation, Awards entitling Participants to receive
shares of Common Stock to be delivered in the future. Such Other Stock-Based Awards shall also be available as a form of payment in the settlement of other Awards granted under the Plan, as stand-alone payments and/or as payment in lieu of
compensation to which a Participant is otherwise entitled. Other Stock-Based Awards may be paid in shares of Common Stock, cash or other property, as the Administrator shall determine. Subject to the provisions of the Plan, the Administrator shall
determine the terms and conditions of each Other Stock-Based Award, including, without limitation, any purchase price, transfer restrictions, vesting conditions and other terms and conditions applicable thereto, which shall be set forth in the
applicable Award Agreement. 
 ARTICLE VIII. 

ADJUSTMENTS FOR CHANGES IN COMMON STOCK AND CERTAIN OTHER EVENTS. 

8.1 Certain Transactions or Events. In the event that the Administrator determines that any dividend or other distribution (whether in
the form of cash, Common Stock, other securities, or other property), reorganization, merger, consolidation, combination, repurchase, recapitalization, liquidation, dissolution, or sale, transfer, exchange or other disposition of assets of the
Company, or sale or exchange of Common Stock or other securities of the Company, issuance of warrants or other rights to purchase Common Stock or other securities of the Company, or other similar corporate transaction or event, as determined by the
Administrator, affects the Common Stock such that an adjustment is determined by the Administrator to be appropriate in order to prevent dilution or enlargement of the benefits or potential benefits intended by the Company to be made available under
the Plan or with respect to any Award, then the Administrator may, in such manner as it may deem equitable, adjust any or all of:     

(a) the number and kind of shares of Common Stock (or other securities or property) with respect to which Awards may be granted or awarded
(including, but not limited to, adjustments of the limitations in Section 4.1 hereof on the maximum number and kind of shares which may be issued);     

(b) the number and kind of shares of Common Stock (or other securities or property) subject to outstanding Awards;    

 (c) the grant or exercise price with respect to any Award; and 

(d) the terms and conditions of any Awards (including, without limitation, any applicable financial or other performance
“targets” specified in an Award Agreement). 

  
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 8.2 Additional Transactions or Events. In the event of any transaction or event
described in Section 8.1 hereof (including, without limitation any change in control) or any unusual or nonrecurring transaction or event affecting the Company or the financial statements or financial condition of the Company, or any change in
any Applicable Laws or accounting principles, the Administrator, on such terms and conditions as it deems appropriate, either by the terms of the Award or by action taken and either automatically or upon the Participant’s request, is hereby
authorized to take any one or more of the following actions whenever the Administrator determines that such action is appropriate in order to (x) prevent dilution or enlargement of the benefits or potential benefits intended by the Company to
be made available under the Plan or with respect to any Award granted or issued under the Plan, (y) to facilitate such transaction or event or (z) give effect to such changes in Applicable Laws or accounting principles: 

(a) To provide for the cancellation of any such Award in exchange for either an amount of cash or other property with a value equal to the
amount that could have been obtained upon the exercise or settlement of the vested portion of such Award or realization of the Participant’s rights under the vested portion of such Award, as applicable; provided that, if the amount that could
have been obtained upon the exercise or settlement of the vested portion of such Award or realization of the Participant’s rights, in any case, is equal to or less than zero, then the vested portion of such Award may be terminated without
payment;     
 (b) To provide that such Award shall vest and, to the extent applicable, be exercisable as to all shares
covered thereby, notwithstanding anything to the contrary in the Plan or the provisions of such Award; 
 (c) To provide that such
Award be assumed by the successor or survivor corporation, or a parent or subsidiary thereof, or shall be substituted for by awards covering the stock of the successor or survivor corporation, or a parent or subsidiary thereof, with appropriate
adjustments as to the number and kind of shares and applicable exercise or purchase price, in all cases, as determined by the Administrator;     

(d) To make adjustments in the number and type of shares of Common Stock (or other securities or property) subject to outstanding Awards,
and/or in the terms and conditions of (including, without limitation, the grant or exercise price), and the criteria included in, outstanding Awards;     

(e) To replace such Award with other rights or property selected by the Administrator; and/or (f) To provide that the Award will
terminate and cannot vest, be exercised or become payable after the applicable event. 
 8.3 Equity Restructurings. In connection
with the occurrence of any Equity Restructuring, and notwithstanding anything to the contrary in this Article VIII, the Administrator will equitably adjust each outstanding Award, which adjustments may include adjustments to the number and type of
securities subject to each outstanding Award and/or the exercise price or grant price thereof, if applicable, the grant of new Awards to Participants, and/or the making of a cash payment to Participants, as the Administrator deems appropriate to
reflect such Equity Restructuring. The adjustments provided under this Section shall be nondiscretionary and shall be final and binding on the affected Participant and the Company; provided that whether an adjustment is equitable shall be determined
by the Administrator. 
 8.4 Administrative Stand Still. In the event of any pending stock dividend, stock split, combination or
exchange of shares, merger, consolidation or other distribution (other than normal cash dividends) of Company assets to stockholders, or any other change affecting the shares of Common Stock or the share price of the Common Stock, including, without
limitation, any Equity Restructuring, for reasons of administrative convenience the Administrator may refuse to permit the exercise of any Award during a period of up to thirty days prior to the consummation of any such transaction. 

  
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 8.5 Miscellaneous. Except as expressly provided in the Plan or pursuant to action of
the Administrator under the Plan, no Participant shall have any rights by reason of any subdivision or consolidation of shares of stock of any class, the payment of any dividend, any increase or decrease in the number of shares of stock of any class
or any dissolution, liquidation, merger, or consolidation of the Company or any other corporation. Except as expressly provided in the Plan or pursuant to action of the Administrator under the Plan, no issuance by the Company of shares of stock of
any class, or securities convertible into shares of stock of any class, shall affect, and no adjustment by reason thereof shall be made with respect to, the number of shares of Common Stock subject to an Award or the grant or exercise price of any
Award. The existence of the Plan, any Award Agreements and the Awards granted hereunder shall not affect or restrict in any way the right or power of the Company to make or authorize (i) any adjustment, recapitalization, reorganization or other
change in the Company’s capital structure or its business, (ii) any merger, consolidation dissolution or liquidation of the Company or sale of Company assets or (iii) any sale or issuance of securities, including, without limitation,
securities with rights superior to those of the Common Stock or which are convertible into or exchangeable for Common Stock. The Administrator may treat Participants and Awards (or portions thereof) differently under this Article VIII. 

ARTICLE IX. 
 GENERAL
PROVISIONS APPLICABLE TO AWARDS. 
 9.1 Transferability. Except as the Administrator may otherwise determine or provide in an
Award Agreement or otherwise, in any case in accordance with Applicable Laws, Awards, including any interest therein, may not be sold, assigned, transferred, pledged or otherwise encumbered by the person to whom they are granted, either voluntarily
or by operation of law, except by will or the laws of descent and distribution, and, during the life of the Participant, shall be exercisable only by the Participant. References to a Participant, to the extent relevant in the context, shall include
references to authorized transferees. 
 9.2 Documentation.    Each Award shall be evidenced in an Award
Agreement, which may be in such form (written, electronic or otherwise) as the Administrator shall determine. Each Award may contain terms and conditions in addition to those set forth in the Plan. 

9.3 Discretion. Except as otherwise provided by the Plan, each Award may be made alone or in addition or in relation to any other
Award. The terms of each Award to a Participant need not be identical, and the Administrator need not treat Participants or Awards (or portions thereof) uniformly. 

9.4 Termination of Status. The Administrator shall determine the effect on an Award of the disability, death, retirement, authorized
leave of absence or any other change or purported change in a Participant’s Service Provider status and the extent to which, and the period during which, the Participant, the Participant’s legal representative, conservator, guardian or
Designated Beneficiary may exercise rights under the Award, if applicable. 
 9.5 Withholding. Each Participant shall pay to the
Company, or make provision satisfactory to the Administrator for payment of, any taxes required by law to be withheld in connection with Awards to such Participant no later than the date of the event creating the tax liability. Except as the
Administrator may otherwise determine, all such payments shall be made in cash, by wire transfer of immediately available funds or by certified check. Notwithstanding the foregoing, Participants may satisfy such tax obligations, subject to
Section 10.8, any Company insider trading policy (including blackout periods) and Applicable Laws, (i) to the extent permitted by the Administrator, in whole or in part by delivery of shares of Common Stock, including shares retained from
the Award creating the tax obligation, valued at their 

  
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 Fair Market Value, and (ii) if there is a public market for shares of Common Stock at the time the tax
obligations are satisfied, unless the Administrator otherwise determines, (A) delivery (including, without limitation, telephonically to the extent permitted by the Company) of an irrevocable and unconditional undertaking by a broker acceptable
to the Company to deliver promptly to the Company sufficient funds to satisfy the tax obligations, or (B) delivery by the Participant to the Company of a copy of irrevocable and unconditional instructions to a broker acceptable to the Company
to deliver promptly to the Company cash or a check sufficient to satisfy the tax withholding; provided that such amount is paid to the Company at such time as may be required by the Administrator. The Company may, to the extent permitted by
Applicable Laws, deduct any such tax obligations based on applicable withholding rates from any payment of any kind otherwise due to a Participant. 

9.6 Amendment of Award. The Administrator may amend, modify or terminate any outstanding Award, including but not limited to,
substituting therefor another Award of the same or a different type, changing the date of exercise or settlement, and converting an Incentive Stock Option to a Non-Qualified Stock Option. The
Participant’s consent to such action shall be required unless (i) the Administrator determines that the action, taking into account any related action, would not materially and adversely affect the Participant, or (ii) the change is
permitted under Article VIII and Section 10.6 hereof. 
 9.7 Conditions on Delivery of Stock. The Company will not be obligated
to deliver any shares of Common Stock pursuant to the Plan or to remove restrictions from shares previously delivered under the Plan until (i) all conditions of the Award have been met or removed to the satisfaction of the Company, (ii) in
the opinion of the Company’s counsel, all other legal matters in connection with the issuance and delivery of such shares have been satisfied, including, without limitation, any applicable securities laws and any applicable stock exchange or
stock market rules and regulations, and (iii) the Participant has executed and delivered to the Company such representations or agreements as the Administrator deems necessary or appropriate to satisfy the requirements of any Applicable Laws.
The inability of the Company to obtain authority from any regulatory body having jurisdiction, which authority is determined by the Administrator to be necessary to the lawful issuance and sale of any securities hereunder, shall relieve the Company
of any liability in respect of the failure to issue or sell such shares as to which such requisite authority shall not have been obtained. 

9.8 Acceleration. The Administrator may at any time provide that any Award shall become vested and/or exercisable in full or in part,
free of some or all restrictions or conditions, or otherwise realizable in full or in part, as the case may be. 
 ARTICLE X. 

MISCELLANEOUS. 
 10.1 No
Right To Employment or Other Status. No person shall have any claim or right to be granted an Award, and the grant of an Award shall not be construed as giving a Participant the right to continued employment or any other relationship with the
Company. The Company expressly reserves the right at any time to dismiss or otherwise terminate its relationship with a Participant free from any liability or claim under the Plan or any Award, except as expressly provided in an applicable Award
Agreement. 
 10.2 No Rights As Stockholder; Certificates. Subject to the provisions of the applicable Award Agreement, no
Participant or Designated Beneficiary shall have any rights as a stockholder with respect to any shares of Common Stock to be distributed with respect to an Award until becoming the record holder of such shares. Notwithstanding any other provision
of the Plan, unless otherwise determined by the Administrator or required by any Applicable Laws, the Company shall not be required to deliver to any Participant certificates evidencing shares of Common Stock issued in connection with any Award and
instead such shares of Common Stock may be recorded in the books of the Company (or, as applicable, its transfer agent or stock plan administrator). The Company may place legends on stock certificates issued under the Plan deemed necessary or
appropriate by the Administrator in order to comply with Applicable Laws. 

  
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 10.3 Effective Date and Term of Plan. The Plan shall become effective on the date on
which it is adopted by the Board. No Awards shall be granted under the Plan after the completion of ten years from the earlier of (i) the date on which the Plan was adopted by the Board or (ii) the date the Plan was approved by the
Company’s stockholders, but Awards previously granted may extend beyond that date in accordance with the terms of the Plan. 
 10.4
Amendment of Plan. The Administrator may amend, suspend or terminate the Plan or any portion thereof at any time; provided that no amendment of the Plan shall materially and adversely affect (as determined by the Administrator) any Award
outstanding at the time of such amendment without the consent of the affected Participant. Awards outstanding under the Plan at the time of any suspension or termination of the Plan shall continue to be governed in accordance with the terms of the
Plan and the applicable Award Agreement, as in effect prior to such suspension or termination. The Board shall obtain stockholder approval of any Plan amendment to the extent necessary to comply with Applicable Laws. 

10.5 Provisions for Foreign Participants. The Administrator may modify Awards granted to Participants who are foreign nationals or
employed outside the United States or establish subplans or procedures under the Plan to address differences in laws, rules, regulations or customs of such foreign jurisdictions with respect to tax, securities, currency, employee benefit or other
matters. 
 10.6 Section 409A.     

(a) General. The Company intends that all Awards be structured in compliance with, or to satisfy an exemption from, Section 409A,
such that no adverse tax consequences, interest, or penalties under Section 409A apply in connection with any Awards. Notwithstanding anything herein or in any Award Agreement to the contrary, the Administrator may, without a Participant’s
prior consent, amend this Plan and/or Awards, adopt policies and procedures, or take any other actions (including, without limitation, amendments, policies, procedures and actions with retroactive effect) as are necessary or appropriate to preserve
the intended tax treatment of Awards under the Plan, including, without limitation, any such actions intended to (A) exempt this Plan and/or any Award from the application of Section 409A, and/or (B) comply with the requirements of
Section 409A, including, without limitation any such regulations, guidance, compliance programs and other interpretative authority that may be issued after the date of grant of any Award. The Company makes no representations or warranties as to
the tax treatment of any Award under Section 409A or otherwise. The Company shall have no obligation under this Section 10.6 or otherwise to take any action (whether or not described herein) to avoid the imposition of taxes, penalties or
interest under Section 409A with respect to any Award and shall have no liability to any Participant or any other person if any Award, compensation or other benefits under the Plan are determined to constitute
non-compliant, “nonqualified deferred compensation” subject to the imposition of taxes, penalties and/or interest under Section 409A. 

(b) Separation from Service. With respect to any Award that constitutes “nonqualified deferred compensation” under
Section 409A, any payment or settlement of such Award that is to be made upon a termination of a Participant’s Service Provider relationship shall, to the extent necessary to avoid the imposition of taxes under Section 409A, be made
only upon the Participant’s “separation from service” (within the meaning of Section 409A), whether such “separation from service” occurs upon or subsequent to the termination of the Participant’s Service Provider
relationship. For purposes of any such provision of this Plan or any Award Agreement relating to any such payments or benefits, references to a “termination,” “termination of employment” or like terms shall mean “separation
from service.” 

  
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 (c) Payments to Specified Employees. Notwithstanding any contrary provision in the
Plan or any Award Agreement, any payment(s) of “nonqualified deferred compensation” that are otherwise required to be made under an Award to a “specified employee” (as defined under Section 409A and determined by the
Administrator) as a result of his or her “separation from service” shall, to the extent necessary to avoid the imposition of taxes under Code Section 409A(a)(2)(B)(i), be delayed until the expiration of the six-month period immediately following such “separation from service” (or, if earlier, until the date of death of the specified employee) and shall instead be paid (in a manner set forth in the Award
agreement) on the day that immediately follows the end of such six-month period or as soon as administratively practicable thereafter (without interest). Any payments of “nonqualified deferred
compensation” under such Award that are, by their terms, payable more than six months following the Participant’s “separation from service” shall be paid at the time or times such payments are otherwise scheduled to be made. 

10.7 Limitations on Liability. Notwithstanding any other provisions of the Plan, no individual acting as a director, officer, other
employee or agent of the Company will be liable to any Participant, former Participant, spouse, beneficiary, or any other person for any claim, loss, liability, or expense incurred in connection with the Plan or any Award, nor will such individual
be personally liable with respect to the Plan because of any contract or other instrument he or she executes in his or her capacity as an Administrator, director, officer, other employee or agent of the Company. The Company will indemnify and hold
harmless each director, officer, other employee and agent of the Company to whom any duty or power relating to the administration or interpretation of the Plan has been or will be granted or delegated, against any cost or expense (including, without
limitation, attorneys’ fees) or liability (including, without limitation, any sum paid in settlement of a claim with the Administrator’s approval) arising out of any act or omission to act concerning this Plan unless arising out of such
person’s own fraud or bad faith. 
 10.8 Lock-Up Period. By accepting an Award, each
Participant agrees that the Participant will not, without the prior written consent of the managing underwriter, during the period commencing on the date of the final prospectus relating to an initial public offering of any of the Company’s
securities and ending on the date specified by the Company and the managing underwriter (such period not to exceed one hundred eighty (180) days, or such other period as may be requested by the Company or an underwriter to accommodate
regulatory restrictions on (1) the publication or other distribution of research reports, and (2) analyst recommendations and opinions, including, but not limited to, the restrictions contained in FINRA Rule 2241 or NYSE Rule 472(f)(4)),
(i) lend; offer; pledge; sell; contract to sell; sell any option or contract to purchase; purchase any option or contract to sell; grant any option, right, or warrant to purchase; or otherwise transfer or dispose of, directly or indirectly, any
shares of Common Stock or any securities convertible into or exercisable or exchangeable (directly or indirectly) for Common Stock held immediately before the effective date of the registration statement for such offering or (ii) enter into any
swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of such securities, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of
Common Stock or other securities, in cash, or otherwise. The foregoing provisions of this Section shall apply only to an initial public offering of the Company’s securities and shall not apply to the sale of any shares to an underwriter
pursuant to an underwriting agreement for such initial public offering. The underwriters in connection with such registration are intended third-party beneficiaries of this Section and shall have the right, power, and authority to enforce the
provisions hereof as though they were a party hereto. Each Participant further agrees to execute such agreements as may be reasonably requested by the underwriters in connection with such registration that are consistent with this Section or that
are necessary to give further effect thereto. 

  
 10 













 10.9 Right of First Refusal. 

(a) Before any shares of Common Stock held by a Participant or any permitted transferee (each, a “Holder”) may be
sold, pledged, assigned, hypothecated, transferred, or otherwise disposed of (each, a “Transfer”), the Company or its assignee(s) shall have a right of first refusal to purchase the shares of Common Stock proposed to be
Transferred on the terms and conditions set forth in this Section 10.9 (the “Right of First Refusal”). In the event that the Company’s charter, bylaws and/or a stockholders’
agreement applicable to the shares of Common Stock contain a right of first refusal with respect to the shares of Common Stock, such right of first refusal shall apply to the shares of Common Stock to the extent such provisions are more restrictive
than the Right of First Refusal set forth in this Section 10.9 and the Right of First Refusal set forth in this Section 10.9 shall not in any way restrict the operation of the Company’s charter, bylaws or the operation of any
applicable stockholders’ agreement. 
 (b) In the event any Holder desires to Transfer any shares of Common Stock, the Holder shall
deliver to the Company a written notice (the “Notice”) stating: (A) the Holder’s bona fide intention to sell or otherwise Transfer such shares of Common Stock; (B) the name of each proposed purchaser or other
transferee (“Proposed Transferee”); (C) the number of shares of Common Stock to be Transferred to each Proposed Transferee; and (D) the price for which the Holder proposes to Transfer the
shares of Common Stock (the “Offered Price”), and the Holder shall offer such shares of Common Stock at the Offered Price to the Company or its assignee(s). 

(c) Within twenty-five days after receipt of the Notice, the Company and/or its assignee(s) may elect in writing to purchase all, or any
portion of the shares of Common Stock proposed to be Transferred to any one or more of the Proposed Transferees by delivery of a written exercise notice to the Holder (a “Company Notice”). The
purchase price (“Purchase Price”) for the shares of Common Stock repurchased under this Section 10.9 shall be the Offered Price. 

(d) Payment of the Purchase Price shall be made, at the option of the Company or its assignee(s), in cash (by check or wire transfer), by
cancellation of all or a portion of any outstanding indebtedness of the Holder to the Company (or, in the case of repurchase by an assignee, to the assignee), or by any combination thereof, within five days after delivery of the Company Notice or in
the manner and at the times mutually agreed to by the Company and the Holder. Should the Offered Price specified in the Notice be payable in property other than cash, the Company or its assignee shall have the right to pay the purchase price in the
form of cash equal in amount to the value of such property, as determined by the Administrator.     
 (e) If all or a
portion of the shares of Common Stock proposed in the Notice to be Transferred are not purchased by the Company and/or its assignee(s) as provided in this Section 10.9, then the Holder may sell or otherwise Transfer such shares of Common Stock
to that Proposed Transferee at the Offered Price or at a higher price; provided that such sale or other Transfer is consummated within sixty days after the date of the Notice; and provided, further, that any such sale or other Transfer is effected
in accordance with any Applicable Laws and the Proposed Transferee agrees in writing that the provisions of this Plan and the applicable Award Agreement and any other applicable agreements governing the shares of Common Stock to be Transferred shall
continue to apply to the shares of Common Stock in the hands of such Proposed Transferee. If the shares of Common Stock described in the Notice are not Transferred to the Proposed Transferee within such
sixty-day period, a new Notice shall be given to the Company, and the Company and/or its assignees shall again be offered the Right of First Refusal, as provided herein, before any shares of Common Stock held
by the Holder may be sold or otherwise Transferred. 
 (f) Anything to the contrary contained in this Section 10.9 notwithstanding and
to the extent permitted by the Administrator, the Transfer of any or all of the shares of Common Stock during a Participant’s lifetime or upon a Participant’s death by will or intestacy to the Participant’s Immediate Family or a trust
for the benefit of the Participant’s Immediate Family shall be exempt from the Right of 

  
 11 













 First Refusal. As used herein, “Immediate Family” shall
mean spouse, lineal descendant or antecedent, father, mother, brother or sister or stepchild (whether or not adopted). In such case, the transferee or other recipient shall receive and hold the shares of Common Stock so Transferred subject to the
provisions of this Plan (including, without limitation, the Right of First Refusal), the applicable Award Agreement and any other applicable agreements governing the shares of Common Stock to be Transferred, and there shall be no further Transfer of
such shares of Common Stock except in accordance with the terms of this Section 10.9 (or otherwise as expressly provided under the Plan). 

(g) The Right of First Refusal shall terminate as to all shares of Common Stock if the Company becomes a Publicly Listed Company upon such
occurrence. 
 10.10 Data Privacy. As a condition of receipt of any Award, each Participant explicitly and unambiguously consents to
the collection, use and transfer, in electronic or other form, of personal data as described in this paragraph by and among, as applicable, the Company and its subsidiaries and affiliates for the exclusive purpose of implementing, administering and
managing the Participant’s participation in the Plan. The Company and its subsidiaries and affiliates may hold certain personal information about a Participant, including but not limited to, the Participant’s name, home address and
telephone number, date of birth, social security or insurance number or other identification number, salary, nationality, job title(s), any shares of stock held in the Company or any of its subsidiaries and affiliates, details of all Awards, in each
case, for the purpose of implementing, managing and administering the Plan and Awards (the “Data”). The Company and its subsidiaries and affiliates may transfer the Data amongst themselves as necessary for the purpose of
implementation, administration and management of a Participant’s participation in the Plan, and the Company and its subsidiaries and affiliates may each further transfer the Data to any third parties assisting the Company in the implementation,
administration and management of the Plan. These recipients may be located in the Participant’s country, or elsewhere, and the Participant’s country may have different data privacy laws and protections than the recipients’ country.
Through acceptance of an Award, each Participant authorizes such recipients to receive, possess, use, retain and transfer the Data, in electronic or other form, for the purposes of implementing, administering and managing the Participant’s
participation in the Plan, including, without limitation, any requisite transfer of such Data as may be required to a broker or other third party with whom the Company or the Participant may elect to deposit any shares of Common Stock. The Data
related to a Participant will be held only as long as is necessary to implement, administer, and manage the Participant’s participation in the Plan. A Participant may, at any time, view the Data held by the Company with respect to such
Participant, request additional information about the storage and processing of the Data with respect to such Participant, recommend any necessary corrections to the Data with respect to the Participant or refuse or withdraw the consents herein in
writing, in any case without cost, by contacting his or her local human resources representative. The Company may cancel Participant’s ability to participate in the Plan and, in the Administrator’s discretion, the Participant may forfeit
any outstanding Awards if the Participant refuses or withdraws his or her consents as described herein. For more information on the consequences of refusal to consent or withdrawal of consent, Participants may contact their local human resources
representative. 
 10.11 Severability. In the event any portion of the Plan or any action taken pursuant thereto shall be held
illegal or invalid for any reason, the illegality or invalidity shall not affect the remaining parts of the Plan, and the Plan shall be construed and enforced as if the illegal or invalid provisions had not been included, and the illegal or invalid
action shall be null and void. 
 10.12 Governing Documents. In the event of any contradiction between the Plan and any Award
Agreement or any other written agreement between a Participant and the Company or any subsidiary of the Company that has been approved by the Administrator, the terms of the Plan shall govern, unless it is expressly specified in such Award Agreement
or other written document that a specific provision of the Plan shall not apply. 

  
 12 













 10.13 Submission to Jurisdiction; Waiver of Jury Trial. By accepting an Award, each
Participant irrevocably and unconditionally consents to submit to the exclusive jurisdiction of the courts of the State of Delaware and of the United States of America, in each case located in the State of Delaware, for any action arising out of or
relating to the Plan (and agrees not to commence any litigation relating thereto except in such courts), and further agrees that service of any process, summons, notice or document by U.S. registered mail to the address contained in the records of
the Company shall be effective service of process for any litigation brought against it in any such court. By accepting an Award, each Participant irrevocably and unconditionally waives any objection to the laying of venue of any litigation arising
out of Plan or Award hereunder in the courts of the State of Delaware or the United States of America, in each case located in the State of Delaware, and further irrevocably and unconditionally waives and agrees not to plead or claim in any such
court that any such litigation brought in any such court has been brought in an inconvenient forum. By accepting an Award, each Participant irrevocably and unconditionally waives, to the fullest extent permitted by applicable law, any and all rights
to trial by jury in connection with any litigation arising out of or relating to the Plan or any Award hereunder. 
 10.14 Governing
Law. The provisions of the Plan and all Awards made hereunder shall be governed by and interpreted in accordance with the laws of the State of Delaware, disregarding
choice-of-law principles of the law of any state that would require the application of the laws of a jurisdiction other than such state. 

10.15 Restrictions on Shares; Claw-back Provisions. Awards and shares of Common Stock acquired in respect of Awards shall be subject to
such terms and conditions as the Administrator shall determine, including, without limitation, restrictions on the transferability of Awards or shares of Common Stock, the right of the Company to repurchase shares of Common Stock, the right of the
Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and co-sale rights
and voting requirements. Such terms and conditions may be additional to those contained in the Plan and may, as determined by the Administrator, be contained in the applicable Award Agreement or in an exercise notice, stockholders’ agreement or
in such other agreement as the Administrator shall determine, in each case in a form determined by the Administrator. The issuance of such shares of Common Stock shall be conditioned on the Participant’s consent to such terms and conditions and
the Participant’s entering into such agreement or agreements. All Awards (including, without limitation, any proceeds, gains or other economic benefit actually or constructively received by Participant upon any receipt or exercise of any Award
or upon the receipt or resale of any shares of Common Stock underlying the Award) shall be subject to the provisions of any claw-back policy implemented by the Company, including, without limitation, any claw-back policy adopted to comply with the
requirements of the Dodd-Frank Wall Street Reform and Consumer Protection Act and any rules or regulations promulgated thereunder, to the extent set forth in such claw-back policy and/or in the applicable Award Agreement. 

10.16 Titles and Headings. The titles and headings of the Sections in the Plan are for convenience of reference only and, in the event
of any conflict, the text of the Plan, rather than such titles or headings, shall control. 
 10.17 Conformity to Securities Laws.
Participant acknowledges that the Plan is intended to conform to the extent necessary with all provisions of the Securities Act and the Exchange Act and any and all regulations and rules promulgated by the Securities and Exchange Commission
thereunder, and state securities laws and regulations. Notwithstanding anything herein to the contrary, the Plan and all Awards granted hereunder shall be administered only in such a manner as to conform to such laws, rules and regulations. To the
extent permitted by Applicable Laws, the Plan and all Award Agreements shall be deemed amended to the extent necessary to conform to such laws, rules and regulations. 

  
 13 













 ARTICLE XI. 

DEFINITIONS.  

11.1 “Administrator” means the Board or a Committee to the extent that the Board’s powers or authority under the
Plan have been delegated to such Committee. 
 11.2 “Applicable Laws” means the
requirements relating to the administration of equity incentive plans under U.S. federal and state securities, tax and other applicable laws, rules and regulations, the applicable rules of any stock exchange or quotation system on which the Common
Stock is listed or quoted and the applicable laws and rules of any foreign country or other jurisdiction where Awards are granted or issued under the Plan. 

11.3 “Award” means, individually or collectively, a grant under the Plan of Options, Restricted Stock,
Restricted Stock Units or Other Stock-Based Awards. 
 11.4 “Award Agreement” means a
written agreement evidencing an Award, which agreements may be in electronic medium and shall contain such terms and conditions with respect to an Award as the Administrator shall determine, consistent with and subject to the terms and conditions of
the Plan. 
 11.5 “Board” means the Board of Directors of the Company. 

11.6 “Change in Control” means (i) a merger or consolidation of the Company with or
into any other corporation or other entity or person, (ii) a sale, lease, exchange or other transfer in one transaction or a series of related transactions of all or substantially all of the Company’s assets, or (iii) any other
transaction, including, without limitation, the sale by the Company of new shares of its capital stock or a transfer of existing shares of capital stock of the Company, the result of which is that a third party that is not an affiliate of the
Company or its stockholders (or a group of third parties not affiliated with the Company or its stockholders) immediately prior to such transaction acquires or holds capital stock of the Company representing a majority of the Company’s
outstanding voting power immediately following such transaction; provided that the following events shall not constitute a “Change in Control”: (A) a transaction (other than a sale of all or substantially all of the Company’s assets)
in which the holders of the voting securities of the Company immediately prior to the merger or consolidation hold, directly or indirectly, a majority of the voting securities in the successor corporation or its parent immediately after the merger
or consolidation; (B) a sale, lease, exchange or other transaction in one transaction or a series of related transactions of all or substantially all of the Company’s assets to an affiliate of the Company; (C) an initial public
offering of any of the Company’s securities or any other transaction or series of related transactions principally for bona fide equity financing purposes; (D) a reincorporation of the Company solely to change its jurisdiction; or
(E) a transaction undertaken for the primary purpose of creating a holding company that will be owned in substantially the same proportion by the persons who held the Company’s securities immediately before such transaction.
Notwithstanding the foregoing, if a Change in Control would give rise to a payment or settlement event with respect to any Award that constitutes “nonqualified deferred compensation,” the transaction or event constituting the Change in
Control must also constitute a “change in control event” (as defined in Treasury Regulation Section 1.409A-3(i)(5)) in order to give rise to the payment or settlement event for such Award, to
the extent required by Section 409A. 
 11.7 “Code” means the Internal Revenue Code of 1986, as amended, and
the regulations issued thereunder.     
 11.8 “Committee” means one or more committees or
subcommittees of the Board or the Company, which may be comprised of one or more directors and/or executive officers of the Company, in either case, to the extent permitted in accordance with Applicable Laws. 

  
 14 













 11.9 “Common Stock” means the common stock of the Company. 

 11.10 “Company” means Adagio Therapeutics, Inc., a Delaware corporation, or any successor thereto. Except where
the context otherwise requires, the term “Company” includes any of the Company’s present or future parent or subsidiary corporations as defined in Sections 424(e) or (f) of the Code and any other business venture (including,
without limitation, joint venture or limited liability company) in which the Company has a significant interest, as determined by the Administrator. 

11.11 “Consultant” means any person, including, without limitation, any advisor, engaged by the
Company or a parent or subsidiary of the Company to render services to such entity if: (i) the consultant or adviser renders bona fide services to the Company; (ii) the services rendered by the consultant or advisor are not in
connection with the offer or sale of securities in a capital-raising transaction and do not directly or indirectly promote or maintain a market for the Company’s securities; and (iii) the consultant or advisor is a natural person, or such
other advisor or consultant as is approved by the Administrator.  
 11.12 “Designated
Beneficiary” means the beneficiary or beneficiaries designated, in a manner determined by the Administrator, by a Participant to receive amounts due or exercise rights of the Participant in the event of the Participant’s
death or incapacity    In the absence of an effective designation by a Participant, “Designated Beneficiary” shall mean the Participant’s estate.  

11.13 “Director” means a member of the Board. 

11.14 “Disability” means a permanent and total disability within the meaning of Section 22(e)(3) of the
Code, as it may be amended from time to time. 
 11.15 “Dividend Equivalents” means a right granted to a Participant
pursuant to Section 6.4(c) hereof to receive the equivalent value (in cash or shares of Common Stock) of dividends paid on shares of Common Stock. 

11.16 “Employee” means any person, including, without limitation, officers and Directors, employed by the Company
(within the meaning of Section 3401(c) of the Code) or any parent or subsidiary of the Company. 
 11.17 “Equity
Restructuring” means, as determined by the Administrator, a non-reciprocal transaction between the Company and its stockholders, such as a stock dividend, stock split, spin-off or recapitalization through a large, nonrecurring cash dividend, that affects the shares of Common Stock (or other securities of the Company) or the share price of Common Stock (or other securities of the
Company) and causes a change in the per share value of the Common Stock underlying outstanding Awards. 
 11.18 “Exchange
Act” means the Securities Exchange Act of 1934, as amended. 
 11.19 “Fair Market Value” means, as of
any date, the value of a share of Common Stock determined as follows: (i) if the Common Stock is listed on any established stock exchange, its Fair Market Value shall be the closing sales price for a share of such Common Stock as quoted on such
exchange for such date, or if no sale occurred on such date, the first market trading day immediately prior to such date during which a sale occurred, as reported in The Wall Street Journal or such other source as the Administrator deems
reliable; (ii) if the Common Stock is not traded on a stock exchange but is quoted on a national market or other quotation system, the last sales price for a share of Common Stock on such date, or if no sales occurred on such date, then on the
date immediately prior to such date on which sales prices are reported, as reported in The Wall Street Journal or such other source as the Administrator deems reliable; or (iii) in the absence of an established market for the Common
Stock, the Fair Market Value thereof shall be determined by the Administrator in its sole discretion. 

  
 15 













 11.20 “Incentive Stock Option” means an
“incentive stock option” as defined in Section 422 of the Code. 
 11.21
“Non-Qualified Stock Option” means an Option that is not intended to be or otherwise does not qualify as an Incentive Stock Option. 

11.22 “Option” means an option to purchase Common Stock. 

11.23 “Other Stock-Based Awards” means other Awards of shares of Common Stock, and other
Awards that are valued in whole or in part by reference to, or are otherwise based on, shares of Common Stock or other property. 
 11.24
“Participant” means a Service Provider who has been granted an Award under the Plan. 
 11.25
“Plan” means this 2020 Equity Incentive Plan. 
 11.26 “Publicly Listed
Company” means that the Company or its successor (i) is required to file periodic reports pursuant to Section 12 of the Exchange Act and (ii) the Common Stock is listed on one or more National Securities
Exchanges (within the meaning of the Exchange Act) or is quoted on NASDAQ or a successor interdealer quotation system. 
 11.27
“Restricted Stock” means Common Stock awarded to a Participant pursuant to Section 6.1 hereof that is subject to certain vesting conditions and other restrictions. 

11.28 “Restricted Stock Unit” means an unfunded, unsecured right to receive,
on the applicable settlement date, one share of Common Stock or an amount in cash or other consideration determined by the Administrator equal to the value thereof as of such payment date, which right may be subject to certain vesting conditions and
other restrictions. 
 11.29 “Section 409A” means Section 409A
of the Code and all regulations, guidance, compliance programs and other interpretative authority thereunder. 
 11.30
“Securities Act” means the Securities Act of 1933, as amended from time to time. 

11.31 “Service Provider” means an Employee, Consultant or Director. 

11.32 “Termination of Service” means the date the Participant ceases to be a Service
Provider. 
 *  *  *  *  * 

  
 16 













 ADAGIO THERAPEUTICS, INC. 

2020 EQUITY INCENTIVE PLAN 

CALIFORNIA SUPPLEMENT 

This supplement is intended to satisfy the requirements of Section 25102(o) of the California Corporations Code and the regulations
issued thereunder (“Section 25102(o)”). Notwithstanding anything to the contrary contained in the Plan and except as otherwise determined by the Administrator, the provisions set forth in this
supplement shall apply to all Awards granted under the Plan to a Participant who is a resident of the State of California on the date of grant (a “California Participant”) and which are intended to be exempt from registration
in California pursuant to Section 25102(o), and otherwise to the extent required to comply with applicable law (but only to such extent). Definitions in the Plan are applicable to this supplement. 

1. Limitation on Securities Issuable under the Plan. The amount of securities issued pursuant to the Plan shall not exceed the amounts
permitted under section 260.140.45 of the California Code of Regulations to the extent applicable. 
 2. Additional Limitations For
Grants. The terms of all Awards shall comply, to the extent applicable, with Sections 260.140.41 and 260.140.42 of the California Code of Regulations. 

3. Additional Requirement to Provide Information to California Participants. The Company shall provide to each California Participant,
not less frequently than annually, copies of annual financial statements (which need not be audited). The Company shall not be required to provide such statements to key persons whose duties in connection with the Company assure their access to
equivalent information. In addition, this information requirement shall not apply to any plan or agreement that complies with all conditions of Rule 701 of the Securities Act of 1933, as amended (“Rule 701”); provided that
for purposes of determining such compliance, any registered domestic partner shall be considered a “family member” as that term is defined in Rule 701.  

* * * * * 












 ADAGIO THERAPEUTICS, INC. 

2020 EQUITY INCENTIVE PLAN 

STOCK OPTION 
 GRANT
NOTICE 
 Adagio Therapeutics, Inc. (the “Company”), pursuant to its 2020 Equity Incentive Plan, as amended from
time to time (the “Plan”), has granted to the participant set forth below (“Participant”), an Option to purchase the number of shares of the Company’s Common Stock (referred to herein as
“Shares”) set forth below. The Option is subject to all of the terms and conditions as set forth herein and in the Stock Option Agreement attached hereto as Exhibit A (the “Stock Option
Agreement”) and the Plan, each of which is incorporated herein by reference. Unless otherwise defined herein, the terms defined in the Plan shall have the same defined meanings in this Stock Option Grant Notice and the
Stock Option Agreement. 
  

			
	Participant:	  	 
		
	Grant Date:	  	 
		
	Vesting Commencement Date:	  	 
		
	Exercise Price per Share:	  	 
		
	 Total Number of Shares
 Subject to
Option:
	  	 
		
	Expiration Date:	  	 
		
	Type of Option:	  	[Incentive Stock Option/Non-Qualified Stock Option]
		
	Vesting Schedule:	  	[Subject to the terms of the Agreement, the Option will vest as to 25% of the Shares on the first anniversary of the vesting commencement date set forth above (the “Vesting
Commencement Date”) and as to 1/48th of the Shares upon Participant’s completion of each successive month of continuous service as a Service Provider after the first anniversary of the Vesting
Commencement Date.] [Notwithstanding the foregoing, the Option will vest in full immediately prior to a Change in Control, subject to Participant’s continued service as a Service Provider until immediately prior to such Change in
Control.]

 By his or her signature and the Company’s signature below, Participant agrees to be bound by the terms
and conditions of the Plan, the Stock Option Agreement and this Grant Notice. Participant has reviewed the Stock Option Agreement, the Plan and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to
executing this Grant Notice and fully understands all provisions of this Grant Notice, the Stock Option Agreement and the Plan. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the
Administrator of the Plan upon any questions arising under the Plan or the Option. 
  

													
	ADAGIO THERAPEUTICS, INC.:	 		 	PARTICIPANT:


													
							
	By:	 	 	 	 	 		 		 	 	 	 


													
	Name:	 	 	 		 		 	Name:	 	 


													
	Title:	 	 	 		 		 		 	


													
		 		 		 		 		 		 	













 EXHIBIT A 

STOCK OPTION AGREEMENT 

Adagio Therapeutics, Inc. (the “Company”) has granted to Participant an Option under the Company’s 2020 Equity
Incentive Plan, as amended from time to time (the “Plan”), to purchase the number of Shares indicated in the Stock Option Grant Notice (“Grant Notice”) to which this Stock Option
Agreement (this “Agreement”) is attached. 
 ARTICLE I 

GENERAL 
 1.1 Defined
Terms. Capitalized terms not specifically defined herein shall have the meanings specified in the Plan and the Grant Notice. 
 1.2
Incorporation of Terms of Plan. The Option is subject to the terms and conditions of the Plan which are incorporated herein by reference. In the event of a conflict between the terms of the Agreement and the Plan, the terms of the Plan shall
control. Participant hereby agrees to execute such further instruments and to take such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the
transferability of shares of Common Stock, the right of the Company to repurchase shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and co-sale rights and voting requirements in accordance with Section 10.15 of the Plan. 

1.3 Grant of Option. In consideration of Participant’s past and/or continued employment with or service to the Company or a parent
or subsidiary and for other good and valuable consideration, effective as of the grant date set forth in the Grant Notice (the “Grant Date”), the Company irrevocably grants to
Participant an Option to purchase any part or all of an aggregate of the number of Shares set forth in the Grant Notice, upon the terms and conditions set forth in the Plan and this Agreement. Unless designated as a
Non-Qualified Stock Option in the Grant Notice, the Option shall be an Incentive Stock Option to the maximum extent permitted by law. 

ARTICLE II 
 PERIOD OF
EXERCISABILITY 
 2.1 Vesting; Exercisability. 

(a) Subject to Section 2.1(b), the Option shall become vested in such amounts and at such times as are set forth in the vesting schedule
in the Grant Notice (the “Vesting Schedule”), provided that any Share as to which the Option would otherwise be fractionally vested will be accumulated and will vest only when a whole Share has
accumulated. The installments provided for in the Vesting Schedule are cumulative. 
 (b) No portion of the Option which has not become
vested at the date Participant incurs a Termination of Service shall thereafter become vested and any such unvested portion shall automatically be forfeited upon such Termination of Service, in each case, except as may be otherwise provided by the
Administrator or as set forth in another written agreement between the Company and Participant. 

  
 A-1 













 (c) Any portion of the Option or the entire Option may be exercised in whole or in part at
any time prior to the time when the Option or portion thereof becomes unexercisable under Section 2.2, provided that each unvested Share with respect to which the Option is exercised (a “Restricted Share”) shall be
subject to the Company Repurchase Right (as defined below) for so long as the Option shall remain unvested with respect to such Share under the terms of this Agreement. The Restricted Shares shall be released from the Company Repurchase Right as set
forth in Section 4.1(d). All Shares with respect to which the Option is exercised shall be assumed first to be vested Shares and, to the extent any such Shares are not vested at the time of exercise, to vest under the terms of this Agreement
before any unexercised portion of the Option, unless otherwise provided by the Administrator. 
 2.2 Expiration of Option. The Option
may not be exercised to any extent by anyone after the first to occur of the following events: 
 (a) The Expiration Date set forth in
the Grant Notice; 
 (b) The expiration of three months following the date of Participant’s Termination of Service, unless such
Termination of Service occurs by reason of Participant’s death, Disability or Cause; 
 (c) The expiration of one year following
the date of Participant’s Termination of Service by reason of Participant’s death or Disability; 
 (d) The date of
Participant’s Termination of Service for Cause; or 
 (e) With respect to any unvested portion of the Option, the date of
Participant’s Termination of Service for any reason. 
 Participant acknowledges that an Incentive Stock Option exercised more than
three months after Participant’s termination of status as an Employee, other than by reason of death or Disability, will be taxed as a Non-Qualified Stock Option. 

“Cause,” means “Cause” (or any term of similar effect) as defined in Participant’s employment agreement
with the Company if such an agreement exists and contains a definition of Cause (or term of similar effect), or, if no such agreement exists or such agreement does not contain a definition of Cause (or term of similar effect), then Cause shall
include, but not be limited to: (i) Participant’s unauthorized use or disclosure of confidential information or trade secrets of the Company or any material breach of a written agreement between Participant and the Company, including
without limitation a material breach of any employment, confidentiality, non-compete, non-solicit or similar agreement; (ii) Participant’s commission of,
indictment for or the entry of a plea of guilty or nolo contendere by Participant to, a felony under the laws of the United States or any state thereof or any crime involving dishonesty or moral turpitude (or any similar crime in any
jurisdiction outside the United States); (iii) Participant’s negligence or willful misconduct in the performance of Participant’s duties or Participant’s willful or repeated failure or refusal to substantially perform assigned duties;
(iv) any act of fraud, embezzlement, material misappropriation or dishonesty committed by Participant against the Company; or (v) any acts, omissions or statements by Participant which the Company determines to be materially detrimental or
damaging to the reputation, operations, prospects or business relations of the Company. 
 2.3 Special Tax Consequences. If the
Option is intended to be an Incentive Stock Option, Participant acknowledges that, to the extent that the aggregate fair market value (determined as of the time the Option is granted) of all Shares with respect to which Incentive Stock Options,
including, without limitation, the Option, are first exercisable by Participant in any calendar year exceeds $100,000 (or such other limitation as imposed by Section 422(d) of the Code), the Option and such other options (or


  
 A-2 













 
the applicable portion thereof) shall be treated as not qualifying under Section 422 of the Code but rather shall be considered Non-Qualified Stock
Options. Participant further acknowledges that the rule set forth in the preceding sentence shall be applied by taking Options and other “incentive stock options” into account in the order in which they were granted. Participant
acknowledges that amendments or modifications made to the Option pursuant to the Plan will not be considered to materially or adversely affect Participant’s rights under the Option solely by reason of causing the Option to become a Non-Qualified Stock Option. Participant also acknowledges that if the Option is exercised more than three (3) months after Participant’s Termination of Service as an Employee, other than by reason of death
or disability, the Option will be taxed as a Non-Qualified Stock Option. 
 ARTICLE III 

EXERCISE OF OPTION 
 3.1
Person Eligible to Exercise. During the lifetime of Participant, only Participant may exercise the Option or any portion thereof. After the death of Participant, any exercisable portion of the Option may, prior to the time when the Option
becomes unexercisable under Section 2.2, be exercised by Participant’s personal representative or by any person empowered to do so under the deceased Participant’s will or under the then applicable laws of descent and distribution.

 3.2 Manner of Exercise. The Option, or any portion thereof, may be exercised solely by delivery to the Secretary of the Company or
the Secretary’s office, or such other place as may be determined by the Administrator, of all of the following prior to the time when the Option or such portion thereof becomes unexercisable under Section 2.2: 

(a) An exercise notice in substantially in the form attached as Exhibit B to the Grant Notice (or such other form as is prescribed by
the Administrator) (the “Exercise Notice”) in writing signed by Participant or any other person then entitled to exercise the Option or portion thereof, stating that the Option or portion thereof is
thereby exercised, such notice complying with all applicable rules established by the Administrator; and 
 (b) Full payment for Shares
with respect to which the Option or portion thereof is exercised in accordance with Section 5.6 of the Plan; and 
 (c) The
receipt by the Company of full payment for any applicable withholding tax in cash, by wire transfer of immediately available funds, by check or in such other form as is permitted by the Plan; and 

(d) In the event the Option or portion thereof shall be exercised pursuant to Section 3.1 by any person or persons other than
Participant, appropriate proof of the right of such person or persons to exercise the Option; and 
 (e) In the event the Option or
portion thereof shall be exercised as to Restricted Shares, the following (collectively, the “Additional Documents”): 

(i) the share certificate or certificates representing such Restricted Shares; 

(ii) the stock assignment duly endorsed in blank, attached as Exhibit C to the Grant Notice (the “Stock
Assignment”), executed by Participant; and 

  
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 (iii) the Joint Escrow Instructions of the Company and Participant attached as Exhibit
D to the Grant Notice (the “Joint Escrow Instructions”), executed by Participant. 

ARTICLE IV 
 RESTRICTED
SHARES 
 4.1 Company Repurchase Right. 

(a) Upon Participant’s Termination of Service for any reason, the Company shall have the right and option to repurchase all of the
Restricted Shares from Participant, or Participant’s transferee or legal representative, as the case may be, for a purchase price equal to the price per Share paid by Participant for such Restricted Shares, as adjusted to reflect any Equity
Restructuring or other transaction or event described in Section 8 of the Plan (the “Company Repurchase Right”). 

(b) The Company may exercise the Company Repurchase Right by delivering to Participant (or his or her transferee or legal representative, as
the case may be), within ninety (90) days of the date of Participant’s Termination of Service, a notice in writing indicating the Company’s intention to exercise the Company Repurchase Right and setting forth a date for closing not
later than thirty (30) days from the mailing of such notice. The closing shall take place at the Company’s office. At the closing, the holder of the certificates for the Restricted Shares shall deliver the stock certificate or certificates
evidencing the Restricted Shares, and the Company shall deliver the purchase price therefore. At its option, the Company may elect to make payment for the Restricted Shares to a bank selected by the Company. The Company shall avail itself of this
option by a notice in writing to Participant stating the name and address of the bank, date of closing, and waiving the closing at the Company’s office. 

(c) Unless the Company has earlier delivered notice of its intention to exercise the Company Repurchase Right, or the Administrator otherwise
determines, the Company will automatically be deemed to have exercised the Company Repurchase Right and timely delivered effective notice thereof with respect to all unvested Shares on the final day upon which such notice could be delivered under
the terms of this Agreement and setting forth the latest date for closing of such repurchase permitted under the terms of this Agreement. 

(d) The Restricted Shares shall be released from the Company Repurchase Right upon vesting of the Option with respect to such Shares in
accordance with the terms of this Agreement. For the avoidance of doubt, all Restricted Shares shall be assumed to vest under the terms of this Agreement before any unexercised portion of the Option, unless otherwise provided by the Administrator.

 (e) Notwithstanding anything in this Agreement or the Additional Documents to the contrary, no payment shall be made under this
Section 4.1 that would cause the Company or any of its affiliates to violate any applicable law, any banking agreement or loan or other financial covenant or cause default of any indebtedness of the Company or any of its affiliates, regardless
of when such agreement, covenant or indebtedness was created, incurred or assumed, and any payment under this Section 4.1 that would cause such violation or default shall result in an extension of the period during which the Company may deliver
notice of its intention to exercise the Company Repurchase Right and of any payment date or other related date, in the sole discretion of the Company, until thirty (30) days after the date such payment shall no longer cause any such violation
or default. 

  
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 4.2 Escrow. 

(a) Participant hereby authorizes and directs the Secretary of the Company, or such other person designated by the Administrator from time to
time, to transfer the Restricted Shares as to which the Company Repurchase Right has been exercised from Participant (or his or her transferee or legal representative, as the case may be) to the Company. 

(b) To ensure the availability for delivery of the Restricted Shares upon repurchase by the Company pursuant to the Company Repurchase Right,
Participant appoints the Secretary of the Company, or such other person designated by the Administrator from time to time as escrow agent, as its attorney-in-fact to
sell, assign and transfer unto the Company, such Restricted Shares, if any, repurchased by the Company pursuant to the Company Repurchase Right and shall, upon execution of the applicable Exercise Notice, deliver and deposit with the Secretary of
the Company, or such other person designated by the Administrator from time to time, the share certificate or certificates representing the Restricted Shares, together with the Stock Assignment. The Restricted Shares and Stock Assignment shall be
held by the Secretary, or such other person designated by the Administrator from time to time, in escrow, pursuant to the Joint Escrow Instructions, until the Company exercises the Company Repurchase Right, until such Restricted Shares are released
from the Company Repurchase Right as set forth in Section 4.1(d) or until such time as this Agreement no longer is in effect. Upon release of the Restricted Shares from the Company’s Repurchase Right, the escrow agent shall as soon as
reasonably practicable deliver to Participant the certificate or certificates representing such Shares in the escrow agent’s possession belonging to Participant, and the escrow agent shall be discharged of all further obligations hereunder.

 (c) The Company, or its designee, shall not be liable for any act it may do or omit to do with respect to holding the Restricted Shares
in escrow and while acting in good faith and in the exercise of its judgment. 
 4.3 Transferability of Restricted Shares. The
Restricted Shares may not be sold, assigned, transferred, pledged or otherwise encumbered, either voluntarily or by operation of law, except by will or the laws of descent and distribution. Any transferee of the Restricted Shares shall hold such
Shares subject to all of the provisions hereof and the Exercise Notice and Additional Documents executed by Participant with respect to such Shares. Any transfer or attempted transfer of any of the Restricted Shares not in accordance with the terms
of this Agreement shall be void and the Company may enforce the terms of this Agreement by stop transfer instructions or similar actions by the Company and its agents or designees. 

4.4 Rights as a Stockholder; Retained Distributions. Except as otherwise provided herein, upon exercise of the Option, Participant
shall have all the rights of a stockholder with respect to the Restricted Shares. All cash dividends and other distributions made or declared with respect to Restricted Shares (“Retained Distributions”)
will be held by the Company until the time (if ever) when the Restricted Shares to which such Retained Distributions relate are released from the Company Repurchase Right as set forth in Section 4.1(d). The Company will establish a
separate Retained Distribution bookkeeping account (“Retained Distribution Account”) for each Restricted Share with respect to which Retained Distributions have been made or declared in cash and
credit the Retained Distribution Account (without interest) on the date of payment with the amount of such cash made or declared with respect to the Restricted Share. Retained Distributions (including any Retained Distribution Account balance) will
immediately and automatically be forfeited to the Company for no consideration in the event the Company exercises the Company Repurchase Right for the Restricted Shares with respect to which the Retained Distributions were paid. In no event shall a
dividend or distribution with respect to Restricted Shares be paid to Participant later than the end of the calendar year in which the dividends are paid to holders of Common Stock or, if later, the 15th day of the third month following the later of
(i) the date the dividends are paid to holders of Common Stock and (ii) the date the Restricted Shares with respect to which the dividends are paid vest. 

  
 A-5 













 4.5 Section 83(b) Election for Restricted Shares. Participant acknowledges that,
with respect to the exercise of the Option for Restricted Shares, an election (an “Election”) may be filed by Participant with the Internal Revenue Service and, if necessary, the proper state taxing authorities,
within thirty (30) days after the purchase of the Restricted Shares, electing pursuant to Section 83(b) of the Internal Revenue Code of 1986 (the “Code”) (and similar state tax provisions if
applicable) to be taxed currently on any difference between the purchase price of the Restricted Shares and their fair market value on the date of purchase. In the case of a Non-Qualified Stock Option, this
will result in a recognition of taxable income to Participant on the date of exercise, measured by the excess, if any, of the fair market value of the Restricted Shares at the time the Option is exercised over the purchase price for the Restricted
Shares. Absent such an Election, taxable income will be measured and recognized by Participant at the time or times on which the Company Repurchase Right lapses. In the case of an Incentive Stock Option, such an Election will result in a recognition
of income to Participant for alternative minimum tax purposes on the date of exercise, measured by the excess, if any, of the fair market value of the Restricted Shares at the time the option is exercised over the purchase price for the Restricted
Shares. Absent such an Election, alternative minimum taxable income will be measured and recognized by Participant at the time or times on which the Company Repurchase Right lapses. Participant is strongly encouraged to seek the advice of his or her
own tax consultant in connection with the purchase of Restricted Shares under this Agreement and the advisability of filing of an Election. Participant represents that Participant has consulted any tax consultant(s) Participant deems advisable in
connection with the purchase of Restricted Shares or the filing of the Election and similar tax provisions. 
 PARTICIPANT ACKNOWLEDGES THAT
IT IS PARTICIPANT’S SOLE RESPONSIBILITY AND NOT THE COMPANY’S TO TIMELY FILE THE ELECTION UNDER SECTION 83(B) OF THE CODE, EVEN IF PARTICIPANT REQUESTS THE COMPANY OR ITS REPRESENTATIVE TO MAKE THIS FILING ON PARTICIPANT’S BEHALF.

 ARTICLE V 
 OTHER
PROVISIONS 
 5.1 Restrictive Legends and Stop-Transfer Orders. 

(a) The share certificate or certificates evidencing the Shares purchased hereunder shall be endorsed with any legends that may be required by
state or federal securities laws and, with regard to Restricted Shares, shall bear such other legends as shall be determined by the Administrator. 

(b) Participant agrees that, in order to ensure compliance with the restrictions referred to herein, the Company may issue appropriate
“stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations to the same effect in its own records. 

(c) The Company shall not be required: (i) to transfer on its books any Shares that have been sold or otherwise transferred in violation
of any of the provisions of this Agreement, or (ii) to treat as owner of such Shares or to accord the right to vote or pay dividends to any purchaser or other transferee to whom such shares shall have been so transferred. 

  
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 5.2 Notices. Any notice to be given under the terms of this Agreement to the Company
shall be addressed to the Company at its principal executive offices in care of the Secretary of the Company, and any notice to be given to Participant shall be addressed to Participant at the most recent address for Participant shown in the
Company’s records. By a notice given pursuant to this Section 5.2, either party may hereafter designate a different address for notices to be given to that party. Any notice which is required to be given to Participant shall, if
Participant is then deceased, be given to the person entitled to exercise his or her Option by written notice under this Section 5.2. Any notice shall be deemed duly given when sent via email or when sent by certified mail (return receipt
requested) and deposited (with postage prepaid) in a post office or branch post office regularly maintained by the United States Postal Service. 

5.3 Titles. Titles are provided herein for convenience only and are not to serve as a basis for interpretation or construction of this
Agreement. 
 5.4 Governing Law; Severability. This Agreement and the Exercise Notice shall be administered, interpreted and enforced
under the laws of the State of Delaware, without regard to the conflicts of law principles thereof. Should any provision of this Agreement be determined by a court of law to be illegal or unenforceable, the other provisions shall nevertheless remain
effective and shall remain enforceable. 
 5.5 Conformity to Securities Laws. Participant acknowledges that the Plan is intended to
conform to the extent necessary with all provisions of the Securities Act and the Exchange Act and any and all regulations and rules promulgated by the Securities and Exchange Commission thereunder, and state securities laws and regulations.
Notwithstanding anything herein to the contrary, the Plan shall be administered, and the Option is granted and may be exercised, only in such a manner as to conform to such laws, rules and regulations. To the extent permitted by applicable law, the
Plan and this Agreement shall be deemed amended to the extent necessary to conform to such laws, rules and regulations. 
 5.6 Successors
and Assigns. The Company may assign any of its rights under this Agreement and the Exercise Notice to single or multiple assignees, and this Agreement shall inure to the benefit of the successors and assigns of the Company. Subject to the
restrictions on transfer herein set forth, this Agreement shall be binding upon Participant and his or her heirs, executors, administrators, successors and assigns. 

5.7 Entire Agreement. The Plan and this Agreement (including, without limitation, all Exhibits hereto) constitute the entire agreement
of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof. 

5.8 Lock-Up Period. Participant agrees that Participant will not, without the prior written
consent of the managing underwriter, during the period commencing on the date of the final prospectus relating to an initial public offering of any of the Company’s securities and ending on the date specified by the Company and the managing
underwriter (such period not to exceed one hundred eighty (180) days, or such other period as may be requested by the Company or an underwriter to accommodate regulatory restrictions on (1) the publication or other distribution of research
reports, and (2) analyst recommendations and opinions, including, but not limited to, the restrictions contained in FINRA Rule 2241 or NYSE Rule 472(f)(4)), (i) lend; offer; pledge; sell; contract to sell; sell any option or contract to
purchase; purchase any option or contract to sell; grant any option, right, or warrant to purchase; or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or
exchangeable (directly or indirectly) for Common Stock held immediately before the effective date of the registration statement for such offering or (ii) enter into any swap or other arrangement that transfers to another, in whole or in part,
any of the economic consequences of ownership of such securities, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Common Stock or other securities, in cash, or otherwise. The 

  
 A-7 













 foregoing provisions of this Section shall apply only to an initial public offering of the Company’s
securities and shall not apply to the sale of any shares to an underwriter pursuant to an underwriting agreement for such initial public offering. The underwriters in connection with such registration are intended third-party beneficiaries of this
Section and shall have the right, power, and authority to enforce the provisions hereof as though they were a party hereto. Participant further agrees to execute such agreements as may be reasonably requested by the underwriters in connection with
such registration that are consistent with this Section or that are necessary to give further effect thereto. 
 * * * * * 

  
 A-8 













 EXHIBIT B 

TO STOCK OPTION GRANT NOTICE 

FORM OF EXERCISE NOTICE 

Effective as of
today,                                ,      
          , the undersigned (“Participant”) hereby elects to exercise Participant’s option to
purchase                 Shares of Adagio Therapeutics, Inc. (the “Company”) under and pursuant to the Adagio Therapeutics, Inc.
2020 Equity Incentive Plan (the “Plan”) and the Stock Option Agreement
dated                                , ____ (the “Option
Agreement”). Capitalized terms used herein without definition shall have the meanings given in the Option Agreement. 
  

			
	 Grant Date:
	 	 
		
	 Number of Shares as to which Option is Exercised:
	 	 
		
	 Exercise Price per Share:
	 	$                            
		
	 Total Exercise Price:
	 	$                            
		
	 Certificate to be issued in name of:
	 	 
		
	 Cash Payment delivered herewith:
	 	$                            (Representing the full Exercise Price for the
Shares, as well as any applicable withholding tax)

 Type of Option:     [Incentive Stock Option/Non-Qualified
Stock Option] 
 1. Representations of Participant.     

(a) Participant acknowledges that Participant has received, read and understood the Plan and the Option Agreement. Participant agrees to abide
by and be bound by their terms and conditions. 
 (b) Participant acknowledges that Participant is purchasing the Shares for
Participant’s own account for investment only, and not with a view to, or for sale in connection with, any distribution of the Shares in violation of the Securities Act of 1933, as amended (the “Securities Act”), or any
rule or regulation under the Securities Act. 
 (c) Participant has had such opportunity as Participant has deemed adequate to obtain from
representatives of the Company such information as is necessary to permit Participant to evaluate the merits and risks of Participant’s investment in the Company. 

(d) Participant has sufficient experience in business, financial and investment matters to be able to evaluate the risks involved in the
purchase of the Shares and to make an informed investment decision with respect to such purchase. 
 (e) Participant can afford a complete
loss of the value of the Shares and is able to bear the economic risk of holding such Shares for an indefinite period. 

  
 B-1 













 (f) Participant understands that (i) the Shares have not been registered under the
Securities Act and are “restricted securities” within the meaning of Rule 144 under the Securities Act, (ii) the Shares cannot be sold, transferred or otherwise disposed of unless they are subsequently registered under the Securities
Act or an exemption from registration is then available; (iii) in any event, the exemption from registration under Rule 144 will not be available for at least one year and even then will not be available unless a public market then exists for
the Common Stock, adequate information concerning the Company is then available to the public, and other terms and conditions of Rule 144 are complied with; and (iv) there is now no registration statement on file with the Securities and
Exchange Commission with respect to any stock of the Company and the Company has no obligation or current intention to register the Shares under the Securities Act. 

2. Tax Consultation. Participant understands that Participant may suffer adverse tax consequences as a result of Participant’s
purchase or disposition of the Shares. Participant represents that Participant has consulted with any tax consultants Participant deems advisable in connection with the purchase or disposition of the Shares and that Participant is not relying on the
Company for any tax advice. Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents. Participant understands that Participant (and not the Company) shall be responsible for
Participant’s tax liability that may arise as a result of this investment or the transactions contemplated by this Agreement.     

3. Restrictive Legends and Stop-Transfer Orders. 

(a) Legends. Participant understands and agrees that the Company shall cause any certificates issued evidencing the Shares to have the
legends set forth below or legends substantially equivalent thereto, together with any other legends that may be required by state or federal securities laws: 

THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (“ACT”), NOR HAVE THEY BEEN
REGISTERED OR QUALIFIED UNDER THE SECURITIES LAWS OF ANY STATE. NO TRANSFER OF SUCH SECURITIES WILL BE PERMITTED UNLESS A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO SUCH TRANSFER, THE TRANSFER IS MADE IN ACCORDANCE WITH RULE 144 UNDER
THE ACT, OR IN THE OPINION OF COUNSEL (WHICH MAY BE COUNSEL FOR THE COMPANY) REGISTRATION UNDER THE ACT IS UNNECESSARY IN ORDER FOR SUCH TRANSFER TO COMPLY WITH THE ACT AND WITH APPLICABLE STATE SECURITIES LAWS. 

THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE SUBJECT TO REPURCHASE PURSUANT TO, AND MAY BE TRANSFERRED ONLY IN ACCORDANCE WITH, THE TERMS
OF AN AGREEMENT BETWEEN THE COMPANY AND THE STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY. SUCH REPURCHASE AND/OR TRANSFER RESTRICTIONS ARE BINDING ON TRANSFEREES OF THESE SHARES. 

(b) Participant agrees that, in order to ensure compliance with the restrictions referred to herein, the Company may issue appropriate
“stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations to the same effect in its own records. 

  
 B-2 













 (c) The Company shall not be required (i) to transfer on its books any Shares that have
been sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the right to vote or pay dividends to any purchaser or other transferee to whom such Shares shall
have been so transferred. 
 4. Notices. Any notice required or permitted hereunder shall be given in accordance with the provisions
set forth in Section 5.2 of the Option Agreement. 
 5. Further Instruments. Participant hereby agrees to execute such further
instruments and to take such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the transferability of shares of Common Stock, the right of the
Company to repurchase shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights,
redemption and co-sale rights and voting requirements in accordance with Section 10.15 of the Plan. 

6. Entire Agreement. The Plan and Option Agreement are incorporated herein by reference. This Agreement, the Plan and the Option
Agreement constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof. 

 

									
	ACCEPTED BY:	 		 	SUBMITTED BY
	ADAGIO THERAPEUTICS, INC.	 		 	PARTICIPANT:


									
				
	By:	 	 	 		 	 


									
	 Print Name:
	 	 	 		 	 Print Name:
	 	 


									
	 Title:
	 	 	 		 		 	


  
 B-3 













 EXHIBIT C 

TO STOCK OPTION GRANT NOTICE 

STOCK ASSIGNMENT 

Assignment Separate From Certificate 

[See instructions below] 

FOR VALUE RECEIVED I, _________, hereby sell, assign and transfer unto __________ the shares of the Common Stock of Adagio Therapeutics, Inc.
registered in my name on the books of said corporation represented by Certificate No. ____ and do hereby irrevocably constitute and
appoint                            to transfer the said stock on the books of the within named
corporation with full power of substitution in the premises. 
 This Assignment Separate from Certificate may be used only in accordance
with the Stock Option Grant Notice and Stock Option Agreement between Adagio Therapeutics, Inc. and the undersigned
dated                                        
,        . 

Dated:                         
               ,         

                       
                                         
                              Signature:         
                                         
                               

INSTRUCTIONS: Please do not fill in any blanks other than the signature line. The purpose of this assignment is to enable the Company to exercise
the Company Repurchase Right, as set forth in the Stock Option Grant Notice and Stock Option Agreement, without requiring additional signatures on the part of Participant. 

 

  
 C-1 













 EXHIBIT D 

TO STOCK OPTION GRANT NOTICE 

JOINT ESCROW INSTRUCTIONS 

                       
       ,          
 Secretary 

Adagio Therapeutics, Inc. 
 As Escrow Agent for
both Adagio Therapeutics, Inc. (the “Company”) and the undersigned purchaser of stock of the Company (the “Participant”), you are hereby authorized and directed to hold the documents delivered to you pursuant to the
terms of that certain Stock Option Grant Notice and Stock Option Agreement (the “Agreement”) between the Company and the undersigned, in accordance with the following instructions: 

1. In the event the Company or any entitled parties (referred to collectively for convenience herein as the
“Company”) exercises or is deemed to have exercised the Company Repurchase Right set forth in the Agreement, the Company shall give to Participant and you a written notice specifying the number of shares of stock to be purchased, the
purchase price, and the time for a closing hereunder at the principal office of the Company. Participant and the Company hereby irrevocably authorize and direct you to close the transaction contemplated by such notice in accordance with the terms of
said notice. 
 2. At the closing, you are directed (a) to date the stock assignments necessary for the transfer in
question, (b) to fill in the number of shares being transferred, and (c) to deliver the same, together with the certificate evidencing the shares of stock to be transferred, to the Company or its assignee, against the simultaneous delivery
to you of the purchase price (by cash, check, wire transfer of immediately available funds or a combination thereof) for the number of shares of stock being purchased pursuant to the exercise of the Company Repurchase Right. 

3. Participant irrevocably authorizes the Company to deposit with you any certificates evidencing shares of stock to be held by
you hereunder and any additions and substitutions to said shares as defined in the Agreement. Participant does hereby irrevocably constitute and appoint you as Participant’s
attorney-in-fact and agent for the term of this escrow to execute, with respect to such securities, all documents necessary or appropriate to make such securities
negotiable and to complete any transaction herein contemplated, including but not limited to the filing with any applicable state blue sky authority of any required applications for consent to, or notice of transfer of, the securities. Subject to
the provisions of this Section 3 and to the terms of the Agreement, Participant shall exercise all rights and privileges of a stockholder of the Company while the stock is held by you. 

4. Upon written request of Participant, but no more than once per calendar year, unless the Company Repurchase Right has been
exercised, you will deliver to Participant a certificate or certificates representing the number of shares of stock as are not then subject to the Company Repurchase Right. Within thirty (30) days after Participant’s Termination of Service
(within the meaning of the Agreement), you will deliver to Participant a certificate or certificates representing the aggregate number of shares held or issued pursuant to the Agreement and not subject to repurchase by the Company or any other
entitled parties pursuant to exercise of the Company Repurchase Right. 
  

  
 D-1 













 5. If, at the time of termination of this escrow, you should have in your
possession any documents, securities, or other property belonging to Participant, you shall deliver all of the same to Participant and shall be discharged of all further obligations hereunder. 

6. Your duties hereunder may be altered, amended, modified or revoked only by a writing signed by all of the parties hereto.

 7. You shall be obligated only for the performance of such duties as are specifically set forth herein and may rely and
shall be protected in relying or refraining from acting on any instrument reasonably believed by you to be genuine and to have been signed or presented by the proper party or parties. You shall not be personally liable for any act you may do or omit
to do hereunder as escrow agent or as attorney-in-fact for Participant while acting in good faith, and any act done or omitted by you pursuant to the advice of your own
attorneys shall be conclusive evidence of such good faith. 
 8. You are hereby expressly authorized to disregard any and all
warnings given by any of the parties hereto or by any other person or corporation, excepting only orders or process of courts of law and are hereby expressly authorized to comply with and obey orders, judgments or decrees of any court. In case you
obey or comply with any such order, judgment or decree, you shall not be liable to any of the parties hereto or to any other person, firm or corporation by reason of such compliance, notwithstanding any such order, judgment or decree being
subsequently reversed, modified, annulled, set aside, vacated or found to have been entered without jurisdiction. 
 9. You
shall not be liable in any respect on account of the identity, authorities or rights of the parties executing or delivering or purporting to execute or deliver the Agreement or any documents or papers deposited or called for hereunder. 

10. You shall not be liable for the expiration of any rights under any applicable state, federal or local statute of
limitations or similar statute or regulation with respect to these Joint Escrow Instructions or any documents deposited with you. 

11. You shall be entitled to employ such legal counsel and other experts as you may deem necessary to advise you in connection
with your obligations hereunder, may rely upon the advice of such counsel, and may pay such counsel reasonable compensation therefor. 

12. Your responsibilities as escrow agent hereunder shall terminate if you shall cease to be an officer or agent of the Company
or if you shall resign by written notice to each party. In the event of any such termination, the Company shall appoint a successor escrow agent. 

13. If you reasonably require other or further instruments in connection with these Joint Escrow Instructions or obligations in
respect hereto, the necessary parties hereto shall join in furnishing such instruments. 
 14. It is understood and agreed
that should any dispute arise with respect to the delivery and/or ownership or right of possession of the securities held by you hereunder, you are authorized and directed to retain in your possession without liability to anyone all or any part of
said securities until such disputes shall have been settled either by mutual written agreement of the parties concerned or by a final order, decree or judgment of a court of competent jurisdiction after the time for appeal has expired and no appeal
has been perfected, but you shall be under no duty whatsoever to institute or defend any such proceedings. 
  

  
 D-2 













 15. Any notice required or permitted hereunder shall be given in writing and
shall be deemed effectively given upon personal delivery or upon deposit in the United States Post Office, by registered or certified mail with postage and fees prepaid, addressed to each of the other parties thereunto entitled at such addresses as
a party may designate by written notice to each of the other parties hereto. 
 16. By signing these Joint Escrow
Instructions, you become a party hereto only for the purpose of said Joint Escrow Instructions; you do not become a party to the Agreement. 

17. This instrument shall be binding upon and inure to the benefit of the parties hereto, and their respective successors and
permitted assigns. 
 18. These Joint Escrow Instructions shall be governed by, and construed and enforced in accordance
with, the laws of the State of Delaware, excluding that body of law pertaining to conflicts of law. 
 [Signature Page Follows] 

 

  
 D-3 













 IN WITNESS WHEREOF, these Joint Escrow Instructions shall be effective as of the date first
set forth above.     
  
  

	
	 ADAGIO THERAPEUTICS, INC.

	
	
By:                  
                                         
                      

	
      Name:            
                                         
                 

	
      Title:            
                                         
                   

	
	PARTICIPANT
	
	                                     
                                         

	
	ESCROW AGENT
	
	
By:                  
                                         
                      

	
      Name:            
                                         
                 

	       Title: Secretary




  
 D-4 













 FORM OF 83(B) ELECTION AND INSTRUCTIONS 

These instructions are provided to assist you if you choose to make an election under Section 83(b) of the Internal Revenue Code, as
amended, with respect to the shares of common stock of Adagio Therapeutics, Inc. transferred to you. Please consult with your personal tax advisor as to whether an election of this nature will be in your best interests in light of your personal
tax situation. 
 The executed original of the Section 83(b) election must be filed with the Internal Revenue Service not later
than 30 days after the date the shares were transferred to you. There is no remedy for failure to file on time. The steps outlined below should be followed to ensure the election is mailed and filed correctly and in a timely manner. If you
make the Section 83(b) election, the election is irrevocable. 
 Complete the Section 83(b) election form
(attached as Attachment 1) and make three (3) copies of the signed election form. 
 Prepare the cover letter to the Internal
Revenue Service (sample letter attached as Attachment 2). 
 Send the cover letter with the originally executed Section 83(b)
election form and one (1) copy via certified mail, return receipt requested to the Internal Revenue Service at the address of the Internal Revenue Service where you file your personal tax returns. We suggest that you have the package
date-stamped at the post office. The post office will provide you with a certified receipt that includes a dated postmark. Enclose a self-addressed, stamped envelope so that the Internal Revenue Service may return a date-stamped copy to you.
However, your postmarked receipt is your proof of having timely filed the Section 83(b) election if you do not receive confirmation from the Internal Revenue Service. 

One (1) copy must be sent to Adagio Therapeutics, Inc. for its records and one (1) copy of the Section 83(b) election form
should be retained for your records. 
 Retain the Internal Revenue Service file stamped copy (when returned) for your records. 

Please consult your personal tax advisor for the address of the office of the Internal Revenue Service to which you should mail your election
form. 
  












 ATTACHMENT 1 

ELECTION UNDER INTERNAL REVENUE CODE SECTION 83(B) 

The undersigned taxpayer hereby elects, pursuant to Section 83(b) of the Internal Revenue Code of 1986, as amended, to include in
taxpayer’s gross income for the current taxable year the amount of any compensation taxable to taxpayer in connection with taxpayer’s receipt of shares (the “Shares”) of Common Stock of Adagio Therapeutics, Inc., a
Delaware corporation (the “Company”). 
 The name, address and taxpayer identification number of the undersigned taxpayer are: 

___________________________ 

___________________________ 

___________________________ 

SSN: ______________________ 
 Description of the
property with respect to which the election is being made: 
 __________________ (_____) shares of Common Stock of the Company. 

The date on which the property was transferred was ______________. The taxable year to which this election relates is calendar year ____. 

Nature of restrictions to which the property is subject: 

The Shares are subject to repurchase by the Company or its assignee upon the occurrence of certain events. This repurchase right lapses based
upon the continued performance of services by the taxpayer over time. 
 The fair market value at the time of transfer, determined without regard to any
restriction other than a restriction which by its terms will never lapse, of the Shares is $______ ($____ per Share). 
 The amount paid by the taxpayer for
the Shares is $______ ($____ per Share). 
 The undersigned has submitted a copy of this statement to the person for whom the services were performed in
connection with the undersigned’s receipt of the above-described property. The transferee of such property is the person performing the services in connection with the transfer of said property. 

Dated: _____________, ____
                                         
                               Taxpayer Signature ________________________ 

 












 ATTACHMENT 2 

SAMPLE COVER LETTER TO INTERNAL REVENUE SERVICE 

__________________, 20___ 

VIA CERTIFIED MAIL 

RETURN RECEIPT REQUESTED 
 Internal Revenue
Service 
 Re:        Election under Section 83(b) of the Internal Revenue Code of 1986 

 Taxpayer:                     
                                         
                                         
                                         
                                     

 Taxpayer’s Social Security
Number:                                        
                                         
                                         
                
 Ladies and Gentlemen: 

Enclosed please find an original and one copy of an Election under Section 83(b) of the Internal Revenue Code of 1986, as amended, being
made by the taxpayer referenced above. Please acknowledge receipt of the enclosed materials by stamping the enclosed copy of the Election and returning it to me in the self-addressed stamped envelope provided herewith.     

 

	
	Very truly yours,
	
	 
	


 Enclosures 

cc:     Adagio Therapeutics, Inc. 
  












 ADAGIO THERAPEUTICS, INC. 

2020 EQUITY INCENTIVE PLAN 

STOCK OPTION GRANT NOTICE 

Adagio Therapeutics, Inc. (the “Company”), pursuant to its 2020 Equity Incentive Plan, as amended from time to time
(the “Plan”), has granted to the participant set forth below (“Participant”), an Option to purchase the number of shares of the Company’s Common Stock (referred to herein as
“Shares”) set forth below. The Option is subject to all of the terms and conditions as set forth herein and in the Stock Option Agreement attached hereto as Exhibit A (the “Stock Option
Agreement”) and the Plan, each of which is incorporated herein by reference. Unless otherwise defined herein, the terms defined in the Plan shall have the same defined meanings in this Stock Option Grant Notice and the Stock Option
Agreement. 
  

			
	 Participant:
  

Grant Date:
  

Vesting Commencement Date:
  

Exercise Price per Share:
  

Total Number of Shares Subject to Option:
  

Expiration Date:
	  	
		
	Type of Option	  	[Incentive Stock Option/Non-Qualified Stock Option]
		
	Vesting Schedule:	  	[Subject to the terms of the Agreement, the Option will vest as to 25% of the Shares on the first anniversary of the vesting commencement date set forth above (the “Vesting Commencement
Date”) and as to 1/48th of the Shares upon Participant’s completion of each successive month of continuous service as a Service Provider after the first anniversary of the
Vesting Commencement Date.] [Notwithstanding the foregoing, the Option will vest in full immediately prior to a Change in Control, subject to Participant’s continued service as a Service Provider until immediately prior to such Change in
Control.]

 By his or her signature and the Company’s signature below, Participant agrees to be bound by the terms
and conditions of the Plan, the Stock Option Agreement and this Grant Notice. Participant has reviewed the Stock Option Agreement, the Plan and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to
executing this Grant Notice and fully understands all provisions of this Grant Notice, the Stock Option Agreement and the Plan. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the
Administrator of the Plan upon any questions arising under the Plan or the Option. 













									
	ADAGIO THERAPEUTICS, INC.	 		 	PARTICIPANT
				
	 By:
	 	                                      
                                  	 		 	                                    
            
				
	 Name:
	 	                                      
                                  	 		 	 [Participant Name]

					
	 Title:
	 	                                      
                                  	 		 		 	













 Exhibit A 

STOCK OPTION AGREEMENT 

Adagio Therapeutics, Inc. (the “Company”) has granted to Participant an Option under the Company’s 2020 Equity
Incentive Plan, as amended from time to time (the “Plan”), to purchase the number of Shares indicated in the Stock Option Grant Notice (“Grant Notice”) to which this Stock Option
Agreement (this “Agreement”) is attached. 
 ARTICLE I. 

GENERAL 
 1.2 Defined
Terms. Capitalized terms not specifically defined herein shall have the meanings specified in the Plan and the Grant Notice. 
 1.3
Incorporation of Terms of Plan. The Option is subject to the terms and conditions of the Plan which are incorporated herein by reference. In the event of a conflict between the terms of the Agreement and the Plan, the terms of the Plan shall
control. Participant hereby agrees to execute such further instruments and to take such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the
transferability of shares of Common Stock, the right of the Company to repurchase shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights, redemption and co-sale rights and voting requirements in accordance with Section 10.15 of the Plan. 

1.4 Grant of Option. In consideration of Participant’s past and/or continued employment with or service to the Company or a parent
or subsidiary and for other good and valuable consideration, effective as of the grant date set forth in the Grant Notice (the “Grant Date”), the Company irrevocably grants to Participant an Option to purchase any part or all
of an aggregate of the number of Shares set forth in the Grant Notice, upon the terms and conditions set forth in the Plan and this Agreement. Unless designated as a Non-Qualified Stock Option in the Grant
Notice, the Option shall be an Incentive Stock Option to the maximum extent permitted by law. 
 ARTICLE II. 

PERIOD OF EXERCISABILITY 

2.1 Vesting; Commencement of Exercisability. 

(a) Subject to Sections 2.1(b) and 2.3, the Option shall become vested and exercisable in such amounts and at such times as are set forth in
the vesting schedule in the Grant Notice (the “Vesting Schedule”), except that any Share as to which the Option would be fractionally vested will be accumulated and will vest and become exercisable only when a
whole Share has accumulated. 
 (b) Unless otherwise determined by the Administrator, any portion of the Option that has not become vested
and exercisable on or prior to the date of Participant’s Termination of Service shall be forfeited on the date of Participant’s Termination of Service and shall not thereafter become vested or exercisable. 

2.2 Duration of Exercisability. The installments provided for in the Vesting Schedule are cumulative. Each such installment which
becomes vested and exercisable pursuant to the Vesting Schedule shall remain vested and exercisable until it becomes unexercisable under Section 2.3 or pursuant to the terms of the Plan. Once the Option becomes unexercisable, it shall be
forfeited immediately. 

  
 A-1 













 2.3 Expiration of Option. The Option may not be exercised to any extent by anyone
after the first to occur of the following events: 
 (a) The Expiration Date set forth in the Grant Notice; 

(b) The expiration of three months following the date of Participant’s Termination of Service, unless such Termination of Service
occurs by reason of Participant’s death, Disability or Cause; 
 (c) The expiration of one year following the date of
Participant’s Termination of Service by reason of Participant’s death or Disability; or 
 (d) The date of Participant’s
Termination of Service for Cause. 
 Participant acknowledges that an Incentive Stock Option exercised more than three months after
Participant’s termination of status as an Employee, other than by reason of death or Disability, will be taxed as a Non-Qualified Stock Option. 

“Cause,” means “Cause” (or any term of similar effect) as defined in Participant’s employment agreement with the Company if
such an agreement exists and contains a definition of Cause (or term of similar effect), or, if no such agreement exists or such agreement does not contain a definition of Cause (or term of similar effect), then Cause shall include, but not be
limited to: (i) Participant’s unauthorized use or disclosure of confidential information or trade secrets of the Company or any material breach of a written agreement between Participant and the Company, including without limitation a
material breach of any employment, confidentiality, non-compete, non-solicit or similar agreement; (ii) Participant’s commission of, indictment for or the
entry of a plea of guilty or nolo contendere by Participant to, a felony under the laws of the United States or any state thereof or any crime involving dishonesty or moral turpitude (or any similar crime in any jurisdiction outside the
United States); (iii) Participant’s negligence or willful misconduct in the performance of Participant’s duties or Participant’s willful or repeated failure or refusal to substantially perform assigned duties; (iv) any act of
fraud, embezzlement, material misappropriation or dishonesty committed by Participant against the Company; or (v) any acts, omissions or statements by Participant which the Company determines to be materially detrimental or damaging to the
reputation, operations, prospects or business relations of the Company. 
 2.4 Special Tax Consequences. If the Option is intended to
be an Incentive Stock Option, Participant acknowledges that, to the extent that the aggregate fair market value (determined as of the time the Option is granted) of all Shares with respect to which Incentive Stock Options, including, without
limitation, the Option, are first exercisable for the first time by Participant in any calendar year exceeds $100,000 (or such other limitation as imposed by Section 422(d) of the Code), the Option and such other options (or the applicable
portion thereof) shall be treated as not qualifying under Section 422 of the Code but rather shall be considered Non-Qualified Stock Options. Participant further acknowledges that the rule set forth in
the preceding sentence shall be applied by taking Options and other “incentive stock options” into account in the order in which they were granted. Participant acknowledges that amendments or modifications made to the Option pursuant to
the Plan that would cause the Option to become a Non-Qualified Stock Option will not materially or adversely affect Participant’s rights under the Option, and that any such amendment or modification shall
not require Participant’s consent. Participant also acknowledges that if the Option is exercised more than three (3) months after Participant’s Termination of Service as an Employee, other than by reason of death or disability, the
Option will be taxed as a Non-Qualified Stock Option. 
  

  
 A-2 













 ARTICLE III. 

EXERCISE OF OPTION 
 3.1
Person Eligible to Exercise. During the lifetime of Participant, only Participant may exercise the Option or any portion thereof. After the death of Participant, any exercisable portion of the Option may, prior to the time when the Option
becomes unexercisable under Section 2.3, be exercised by Participant’s personal representative or by any person empowered to do so under the deceased Participant’s will or under the then applicable laws of descent and distribution.

 3.2 Partial Exercise. Any exercisable portion of the Option or the entire Option, if then wholly exercisable, may be exercised in
whole or in part at any time prior to the time when the Option or portion thereof becomes unexercisable under Section 2.3. 
 3.3
Manner of Exercise. The Option, or any exercisable portion thereof, may be exercised solely by delivery to the Secretary of the Company or the Secretary’s office, or such other place as may be determined by the Administrator, of all of
the following prior to the time when the Option or such portion thereof becomes unexercisable under Section 2.3: 
 (a) An exercise
notice in substantially in the form attached as Exhibit B to the Grant Notice (or such other form as is prescribed by the Administrator) (the “Exercise Notice”) in writing signed by Participant or any other person then
entitled to exercise the Option or portion thereof, stating that the Option or portion thereof is thereby exercised, such notice complying with all applicable rules established by the Administrator; and 

(b) Full payment for Shares with respect to which the Option or portion thereof is exercised in accordance with Section 5.6 of the
Plan; and 
 (c) The receipt by the Company of full payment for any applicable withholding tax in cash, by wire transfer of immediately
available funds, by check or in such other form as is permitted by the Plan; and 
 (d) In the event the Option or portion thereof
shall be exercised pursuant to Section 3.1 by any person or persons other than Participant, appropriate proof of the right of such person or persons to exercise the Option. 

ARTICLE IV. 
 OTHER
PROVISIONS 
 4.1 Restrictive Legends and Stop-Transfer Orders. 

(a) Participant agrees that, in order to ensure compliance with the restrictions referred to herein, the Company may issue appropriate
“stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations to the same effect in its own records. 

(b) The Company shall not be required: (i) to transfer on its books any Shares that have been sold or otherwise transferred in violation
of any of the provisions of this Agreement, or (ii) to treat as owner of such Shares or to accord the right to vote or pay dividends to any purchaser or other transferee to whom such shares shall have been so transferred. 

  
 A-3 













 4.2 Notices. Any notice to be given under the terms of this Agreement to the Company
shall be addressed to the Company at its principal executive offices in care of the Secretary of the Company, and any notice to be given to Participant shall be addressed to Participant at the most recent address for Participant shown in the
Company’s records. By a notice given pursuant to this Section 4.2, either party may hereafter designate a different address for notices to be given to that party. Any notice which is required to be given to Participant shall, if
Participant is then deceased, be given to the person entitled to exercise his or her Option by written notice under this Section 4.2. Any notice shall be deemed duly given when sent via email or when sent by certified mail (return receipt
requested) and deposited (with postage prepaid) in a post office or branch post office regularly maintained by the United States Postal Service. 

4.3 Titles. Titles are provided herein for convenience only and are not to serve as a basis for interpretation or construction of this
Agreement. 
 4.4 Governing Law; Severability. This Agreement and the Exercise Notice shall be administered, interpreted and enforced
under the laws of the State of Delaware, without regard to the conflicts of law principles thereof. Should any provision of this Agreement be determined by a court of law to be illegal or unenforceable, the other provisions shall nevertheless remain
effective and shall remain enforceable. 
 4.5 Conformity to Securities Laws. Participant acknowledges that the Plan is intended to
conform to the extent necessary with all provisions of the Securities Act and the Exchange Act and any and all regulations and rules promulgated by the Securities and Exchange Commission thereunder, and state securities laws and regulations.
Notwithstanding anything herein to the contrary, the Plan shall be administered, and the Option is granted and may be exercised, only in such a manner as to conform to such laws, rules and regulations. To the extent permitted by applicable law, the
Plan and this Agreement shall be deemed amended to the extent necessary to conform to such laws, rules and regulations. 
 4.6 Successors
and Assigns. The Company may assign any of its rights under this Agreement and the Exercise Notice to single or multiple assignees, and this Agreement shall inure to the benefit of the successors and assigns of the Company. Subject to the
restrictions on transfer herein set forth, this Agreement shall be binding upon Participant and his or her heirs, executors, administrators, successors and assigns. 

4.7 Entire Agreement. The Plan and this Agreement (including, without limitation, all Exhibits hereto) constitute the entire agreement
of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof. 

4.8 Lock-Up Period. Participant agrees that Participant will not, without the prior written
consent of the managing underwriter, during the period commencing on the date of the final prospectus relating to an initial public offering of any of the Company’s securities and ending on the date specified by the Company and the managing
underwriter (such period not to exceed one hundred eighty (180) days, or such other period as may be requested by the Company or an underwriter to accommodate regulatory restrictions on (1) the publication or other distribution of research
reports, and (2) analyst recommendations and opinions, including, but not limited to, the restrictions contained in FINRA Rule 2241 or NYSE Rule 472(f)(4)), (i) lend; offer; pledge; sell; contract to sell; sell any option or contract to
purchase; purchase any option or contract to sell; grant any option, right, or warrant to purchase; or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or
exchangeable (directly or indirectly) for Common Stock held immediately before the effective date of the registration statement for such offering or (ii) enter into any swap or other arrangement that transfers to another, in whole or in part,
any of the economic 
  

  
 A-4 













 consequences of ownership of such securities, whether any such transaction described in clause (i) or
(ii) above is to be settled by delivery of Common Stock or other securities, in cash, or otherwise. The foregoing provisions of this Section shall apply only to an initial public offering of the Company’s securities and shall not apply to the
sale of any shares to an underwriter pursuant to an underwriting agreement for such initial public offering. The underwriters in connection with such registration are intended third-party beneficiaries of this Section and shall have the right,
power, and authority to enforce the provisions hereof as though they were a party hereto. Participant further agrees to execute such agreements as may be reasonably requested by the underwriters in connection with such registration that are
consistent with this Section or that are necessary to give further effect thereto. 
 * * * * * 

  
 A-5 













 Exhibit B 

TO STOCK OPTION AGREEMENT 

FORM OF EXERCISE NOTICE 

Effective as of
today,                                ,      
          , the undersigned (“Participant”) hereby elects to exercise Participant’s option to
purchase                             Shares of Adagio Therapeutics, Inc. (the
“Company”) under and pursuant to the Adagio Therapeutics, Inc. 2020 Equity Incentive Plan (the “Plan”) and the Stock Option Agreement
dated                                ,       
         (the “Option Agreement”). Capitalized terms used herein without definition shall have the meanings given in the Option Agreement. 

			
		
	 Grant Date:
	 	                                    
                                         
                                         
                                         
                  
		
	Number of Shares as to which Option is Exercised:	 	                                    
                                         
       
		
	 Exercise Price per Share:
	 	$                        
		
	 Total Exercise Price:
	 	$                        
		
	 Certificate to be issued in name of:
	 	                                    
                                         
       
		
	 Cash Payment delivered herewith:
	 	$                        (Representing the full Exercise Price for the Shares, as well as any
applicable withholding tax)
		
	 Type of Option:
	 	☐ Incentive Stock Option    ☐ Non-Qualified Stock Option

 1. Representations of Participant. 

(a) Participant acknowledges that Participant has received, read and understood the Plan and the Option Agreement. Participant agrees to abide
by and be bound by their terms and conditions. 
 (b) Participant acknowledges that Participant is purchasing the Shares for
Participant’s own account for investment only, and not with a view to, or for sale in connection with, any distribution of the Shares in violation of the Securities Act of 1933, as amended (the “Securities Act”), or any
rule or regulation under the Securities Act. 
 (c) Participant has had such opportunity as Participant has deemed adequate to obtain from
representatives of the Company such information as is necessary to permit Participant to evaluate the merits and risks of Participant’s investment in the Company. 

(d) Participant has sufficient experience in business, financial and investment matters to be able to evaluate the risks involved in the
purchase of the Shares and to make an informed investment decision with respect to such purchase. 
 (e) Participant can afford a complete
loss of the value of the Shares and is able to bear the economic risk of holding such Shares for an indefinite period. 
 (f) Participant
understands that (i) the Shares have not been registered under the Securities Act and are “restricted securities” within the meaning of Rule 144 under the Securities Act, (ii) the Shares cannot be sold, transferred or otherwise
disposed of unless they are subsequently registered under the Securities Act or an exemption from registration is then available; (iii) in any event, the exemption from registration under Rule 144 will not be available for at least one year and
even then will 
  

  
 B-1 













 not be available unless a public market then exists for the Common Stock, adequate
information concerning the Company is then available to the public, and other terms and conditions of Rule 144 are complied with; and (iv) there is now no registration statement on file with the Securities and Exchange Commission with respect
to any stock of the Company and the Company has no obligation or current intention to register the Shares under the Securities Act. 
 2.
Tax Consultation. Participant understands that Participant may suffer adverse tax consequences as a result of Participant’s purchase or disposition of the Shares. Participant represents that Participant has consulted with any tax
consultants Participant deems advisable in connection with the purchase or disposition of the Shares and that Participant is not relying on the Company for any tax advice. Participant is relying solely on such advisors and not on any statements or
representations of the Company or any of its agents. Participant understands that Participant (and not the Company) shall be responsible for Participant’s tax liability that may arise as a result of this investment or the transactions
contemplated by this Agreement. 
 3. Restrictive Legends and Stop-Transfer Orders. 

(a) Legends. Participant understands and agrees that the Company shall cause any certificates issued evidencing the Shares to have the legends
set forth below or legends substantially equivalent thereto, together with any other legends that may be required by state or federal securities laws: 

THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (“ACT”), NOR HAVE THEY BEEN
REGISTERED OR QUALIFIED UNDER THE SECURITIES LAWS OF ANY STATE. NO TRANSFER OF SUCH SECURITIES WILL BE PERMITTED UNLESS A REGISTRATION STATEMENT UNDER THE ACT IS IN EFFECT AS TO SUCH TRANSFER, THE TRANSFER IS MADE IN ACCORDANCE WITH RULE 144 UNDER
THE ACT, OR IN THE OPINION OF COUNSEL (WHICH MAY BE COUNSEL FOR THE COMPANY) REGISTRATION UNDER THE ACT IS UNNECESSARY IN ORDER FOR SUCH TRANSFER TO COMPLY WITH THE ACT AND WITH APPLICABLE STATE SECURITIES LAWS. 

THE SHARES REPRESENTED BY THIS CERTIFICATE MAY BE TRANSFERRED ONLY IN ACCORDANCE WITH THE TERMS OF AN AGREEMENT BETWEEN THE COMPANY AND THE
STOCKHOLDER, A COPY OF WHICH IS ON FILE WITH THE SECRETARY OF THE COMPANY. SUCH TRANSFER RESTRICTIONS ARE BINDING ON TRANSFEREES OF THESE SHARES. 

(b) Participant agrees that, in order to ensure compliance with the restrictions referred to herein, the Company may issue appropriate
“stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make appropriate notations to the same effect in its own records. 

  
 B-2 













 (c) The Company shall not be required (i) to transfer on its books any Shares that have
been sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the right to vote or pay dividends to any purchaser or other transferee to whom such Shares shall
have been so transferred. 
 4. Notices. Any notice required or permitted hereunder shall be given in accordance with the provisions
set forth in Section 4.2 of the Option Agreement. 
 5. Further Instruments. Participant hereby agrees to execute such further
instruments and to take such further action as the Company requests to carry out the purposes and intent of this Agreement and the Plan, including, without limitation, restrictions on the transferability of shares of Common Stock, the right of the
Company to repurchase shares of Common Stock, the right of the Company to require that shares of Common Stock be transferred in the event of certain transactions, tag-along rights, bring-along rights,
redemption and co-sale rights and voting requirements in accordance with Section 10.15 of the Plan. 

6. Entire Agreement. The Plan and Option Agreement are incorporated herein by reference. This Agreement, the Plan and the Option
Agreement constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof. 

 

									
	 ACCEPTED BY:
 ADAGIO
THERAPEUTICS, INC.
  
	 		 	 SUBMITTED BY:

PARTICIPANT



									
	 By:
	 	 	 		 		 	 


									
					
	 Name: _
	 		 		 		 	 [Participant Name]



									
					
	 Title:
	 	 	 		 		 	


  
 B-3