Document:

EX-10.2

 Exhibit 10.2 

ALLOVIR, INC. 
 2020
STOCK OPTION AND GRANT PLAN 
  

	SECTION	  1.     GENERAL PURPOSE OF THE PLAN; DEFINITIONS 

The name of the plan is the AlloVir, Inc. 2020 Stock Option and Grant Plan (the “Plan”). The purpose of the Plan is to encourage and enable the
officers, employees, Non-Employee Directors and Consultants of AlloVir, Inc. (the “Company”) and its Affiliates upon whose judgment, initiative and efforts the Company largely depends for the
successful conduct of its business to acquire a proprietary interest in the Company. It is anticipated that providing such persons with a direct stake in the Company’s welfare will assure a closer identification of their interests with those of
the Company and its stockholders, thereby stimulating their efforts on the Company’s behalf and strengthening their desire to remain with the Company. 

The following terms shall be defined as set forth below: 

“Act” means the U.S. Securities Act of 1933, as amended, and the rules and regulations thereunder. 

“Administrator” means either the Board or the compensation committee of the Board or a similar committee performing the
functions of the compensation committee and which is comprised of not less than two Non-Employee Directors who are independent. 

“Affiliate” means, at the time of determination, any “parent” or “subsidiary” of the Company as such
terms are defined in Rule 405 of the Act. The Board will have the authority to determine the time or times at which “parent” or “subsidiary” status is determined within the foregoing definition. 

“Award” or “Awards,” except where referring to a particular category of grant under the Plan, shall include
Incentive Stock Options, Non-Qualified Stock Options, Stock Appreciation Rights, Restricted Stock Units, Restricted Stock Awards, Unrestricted Stock Awards, Cash-Based Awards, and Dividend Equivalent Rights.

 “Award Agreement” means a written or electronic document setting forth the terms and provisions applicable to an Award
granted under the Plan. Each Award Agreement is subject to the terms and conditions of the Plan. 
 “Board” means the Board
of Directors of the Company. 
 “Cash-Based Award” means an Award entitling the recipient to receive a cash-denominated
payment. 
 “Cause” means, unless otherwise set forth in any employment agreement between the Company or a grantee or in
the applicable Award Agreement, (i) the grantee’s dishonest statements or acts with respect to the Company or any Affiliate of the Company, or any current or prospective customers, suppliers, vendors or other third parties with which such
entity does business; (ii) the grantee’s commission of (A) a felony or (B) any misdemeanor involving moral turpitude, deceit, dishonesty or fraud; (iii) the grantee’s failure to perform his assigned duties and
responsibilities to the reasonable satisfaction of the Company, which failure continues, in the reasonable judgment of the Company, after written notice given to the grantee by the Company; (iv) the grantee’s gross negligence, willful
misconduct or insubordination with respect to the Company or any Affiliate of the Company; or (v) the grantee’s material violation of any provision of any agreement(s) between the grantee and the Company relating to noncompetition, non-solicitation, nondisclosure and/or assignment of inventions. 

 “Code” means the Internal Revenue Code of 1986, as amended, and any
successor Code, and related rules, regulations and interpretations. 
 “Consultant” means a consultant or adviser who
provides bona fide services to the Company or an Affiliate as an independent contractor and who qualifies as a consultant or advisor under Instruction A.1.(a)(1) of Form S-8 under the Act. 

“Dividend Equivalent Right” means an Award entitling the grantee to receive credits based on cash dividends that would have
been paid on the shares of Stock specified in the Dividend Equivalent Right (or other award to which it relates) if such shares had been issued to and held by the grantee. 

“Effective Date” means the date on which the Plan becomes effective as set forth in Section 19. 

“Exchange Act” means the U.S. Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder. 

“Fair Market Value” of the Stock on any given date means the fair market value of the Stock determined in good faith by the
Administrator; provided, however, that if the Stock is listed on The Nasdaq Global Market, The New York Stock Exchange or another national securities exchange or traded on any established market, the determination shall be made by reference to
market quotations. If there are no market quotations for such date, the determination shall be made by reference to the last date preceding such date for which there are market quotations; provided further, however, that if the date for which Fair
Market Value is determined is the Registration Date, the Fair Market Value shall be the “Price to the Public” (or equivalent) set forth on the cover page for the final prospectus relating to the Company’s initial public offering. 

“Incentive Stock Option” means any Stock Option designated and qualified as an “incentive stock option” as defined
in Section 422 of the Code. 
 “Non-Employee Director” means a member of the
Board who is not also an employee of the Company or any Subsidiary. 
 “Non-Qualified Stock
Option” means any Stock Option that is not an Incentive Stock Option. 

  
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 “Option” or “Stock Option” means any option to purchase
shares of Stock granted pursuant to Section 5. 
 “Registration Date” means the date upon which the
registration statement on Form S-1 that is filed by the Company with respect to its initial public offering is declared effective by the U.S. Securities and Exchange Commission. 

“Restricted Shares” means the shares of Stock underlying a Restricted Stock Award that remain subject to a risk of forfeiture
or the Company’s right of repurchase. 
 “Restricted Stock Award” means an Award of Restricted Shares subject to such
restrictions and conditions as the Administrator may determine at the time of grant. 
 “Restricted Stock Units” means an
Award of stock units subject to such restrictions and conditions as the Administrator may determine at the time of grant. 
 “Sale
Event” shall mean (i) the sale of all or substantially all of the assets of the Company on a consolidated basis to an unrelated person or entity, (ii) a merger, reorganization or consolidation pursuant to which the holders of the
Company’s outstanding voting power and outstanding stock immediately prior to such transaction do not own a majority of the outstanding voting power and outstanding stock or other equity interests of the resulting or successor entity (or its
ultimate parent, if applicable) immediately upon completion of such transaction, (iii) the sale of all of the Stock of the Company to an unrelated person, entity or group thereof acting in concert, or (iv) any other transaction in which
the owners of the Company’s outstanding voting power immediately prior to such transaction do not own at least a majority of the outstanding voting power of the Company or any successor entity immediately upon completion of the transaction
other than as a result of the acquisition of securities directly from the Company. 
 “Sale Price” means the value as
determined by the Administrator of the consideration payable, or otherwise to be received by stockholders, per share of Stock pursuant to a Sale Event. 

“Section 409A” means Section 409A of the Code and the regulations and other guidance promulgated
thereunder. 
 “Service Relationship” means any relationship as an employee,
Non-Employee Director or Consultant of the Company or any Affiliate. Unless as otherwise set forth in the Award Agreement, a Service Relationship shall be deemed to continue without interruption in the event a
grantee’s status changes from full-time employee to part-time employee or a grantee’s status changes from employee to Consultant or Non-Employee Director or vice versa, provided that there is no
interruption or other termination of Service Relationship in connection with the grantee’s change in capacity. 

“Stock” means the Common Stock, par value $0.0001 per share, of the Company, subject to adjustments pursuant to
Section 3. 
 “Stock Appreciation Right” means an Award entitling the recipient to receive shares of Stock (or cash,
to the extent explicitly provided for in the applicable Award Agreement) having a value equal to the excess of the Fair Market Value of the Stock on the date of exercise over the exercise price of the Stock Appreciation Right multiplied by the
number of shares of Stock with respect to which the Stock Appreciation Right shall have been exercised. 

  
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 “Subsidiary” means any corporation or other entity (other than the Company)
in which the Company has at least a 50 percent interest, either directly or indirectly. 
 “Ten Percent Owner” means
an employee who owns or is deemed to own (by reason of the attribution rules of Section 424(d) of the Code) more than 10 percent of the combined voting power of all classes of stock of the Company or any parent or subsidiary corporation.

 “Unrestricted Stock Award” means an Award of shares of Stock free of any restrictions. 

 

	SECTION	  2.     ADMINISTRATION OF PLAN; ADMINISTRATOR AUTHORITY TO SELECT GRANTEES AND
DETERMINE AWARDS 

 (a)    Administration of Plan. The Plan shall be administered by the
Administrator. 
 (b)    Powers of Administrator. The Administrator shall have the power and authority to grant
Awards consistent with the terms of the Plan, including the power and authority: 
 (i)    to select the individuals to
whom Awards may from time to time be granted; 
 (ii)    to determine the time or times of grant, and the extent, if
any, of Incentive Stock Options, Non-Qualified Stock Options, Stock Appreciation Rights, Restricted Stock Awards, Restricted Stock Units, Unrestricted Stock Awards, Cash-Based Awards, and Dividend Equivalent
Rights, or any combination of the foregoing, granted to any one or more grantees; 
 (iii)    to determine the number of
shares of Stock to be covered by any Award; 
 (iv)    to determine and modify from time to time the terms and
conditions, including restrictions, not inconsistent with the terms of the Plan, of any Award, which terms and conditions may differ among individual Awards and grantees, and to approve the forms of Award Agreements; 

(v)    to accelerate at any time the exercisability or vesting of all or any portion of any Award; 

(vi)    subject to the provisions of Section 5(c), to extend at any time the period in which Stock Options may be
exercised; and 
 (vii)    at any time to adopt, alter and repeal such rules, guidelines and practices for
administration of the Plan and for its own acts and proceedings as it shall deem advisable; to interpret the terms and provisions of the Plan and any Award (including related written instruments); to make all determinations it deems advisable for
the administration of the Plan; to decide all disputes arising in connection with the Plan; and to otherwise supervise the administration of the Plan. 

  
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 All decisions and interpretations of the Administrator shall be final, binding, and
conclusive on all persons, including the Company and Plan grantees. 
 (c)    Delegation of Authority to Grant
Awards. Subject to applicable law, the Administrator, in its discretion, may delegate to a committee consisting of one or more officers of the Company including the Chief Executive Office of the Company all or part of the Administrator’s
authority and duties with respect to the granting of Awards to individuals who are (i) not subject to the reporting and other provisions of Section 16 of the Exchange Act and (ii) not members of the delegated committee. Any such
delegation by the Administrator shall include a limitation as to the amount of Stock underlying Awards that may be granted during the period of the delegation and shall contain guidelines as to the determination of the exercise price and the vesting
criteria. The Administrator may revoke or amend the terms of a delegation at any time but such action shall not invalidate any prior actions of the Administrator’s delegate or delegates that were consistent with the terms of the Plan. 

(d)    Award Agreement. Awards under the Plan shall be evidenced by Award Agreements that set forth the terms,
conditions and limitations for each Award which may include, without limitation, the term of an Award and the provisions applicable in the event the Service Relationship terminates. 

(e)    Indemnification. Neither the Board nor the Administrator, nor any member of either or any delegate thereof,
shall be liable for any act, omission, interpretation, construction or determination made in good faith in connection with the Plan, and the members of the Board and the Administrator (and any delegate thereof) shall be entitled in all cases to
indemnification and reimbursement by the Company in respect of any claim, loss, damage or expense (including, without limitation, reasonable attorneys’ fees) arising or resulting therefrom to the fullest extent permitted by law and/or under the
Company’s articles or bylaws or any directors’ and officers’ liability insurance coverage which may be in effect from time to time and/or any indemnification agreement between such individual and the Company. 

(f)    Foreign Award Recipients. Notwithstanding any provision of the Plan to the contrary, in order to comply with
the laws in other countries in which the Company and its Subsidiaries operate or have employees or other individuals eligible for Awards, the Administrator, in its sole discretion, shall have the power and authority to: (i) determine which
Subsidiaries shall be covered by the Plan; (ii) determine which individuals outside the United States are eligible to participate in the Plan; (iii) modify the terms and conditions of any Award granted to individuals outside the United
States to comply with applicable foreign laws; (iv) establish subplans and modify exercise procedures and other terms and procedures, to the extent the Administrator determines such actions to be necessary or advisable (and such subplans and/or
modifications shall be attached to this Plan as appendices); provided, however, that no such subplans and/or modifications shall increase the share limitations contained in Section 3(a) hereof; and (v) take any action, before or after
an Award is made, that the Administrator determines to be necessary or advisable to obtain approval or comply with any local governmental regulatory exemptions or approvals. Notwithstanding the foregoing, the Administrator may not take any
actions hereunder, and no Awards shall be granted, that would violate the Exchange Act or any other applicable United States securities law, the Code, or any other applicable United States governing statute or law. 

  
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	SECTION	  3.     STOCK ISSUABLE UNDER THE PLAN; MERGERS; SUBSTITUTION

 (a)    Stock Issuable. The maximum number of shares of Stock reserved and available for
issuance under the Plan shall be 8,008,734 shares (the “Initial Limit”), subject to adjustment as provided in this Section 3, plus on January 1, 2021 and on each January 1 thereafter, the number of shares of Stock reserved
and available for issuance under the Plan shall be cumulatively increased by 5 percent of the number of shares of Common Stock issued and outstanding on the immediately preceding December 31, or such lesser number of shares as approved by
the Administrator, in all cases subject to adjustment as provided in this Section 3(c) (the “Annual Increase”). Subject to such overall limitation, the maximum aggregate number of shares of Stock that may be issued in the form of
Incentive Stock Options shall not exceed the Initial Limit cumulatively increased on January 1, 2021 and on each January 1 thereafter by the lesser of the Annual Increase for such year or 8,008,734 shares of Stock, subject in all cases to
adjustment as provided in Section 3(c). For purposes of this limitation, the shares of Stock underlying any awards under the Plan and the shares of Common Stock of the Company underlying the Company’s 2018 Equity Incentive Plan that are
forfeited, canceled, held back upon exercise of an Option or settlement of an Award to cover the exercise price or tax withholding, reacquired by the Company prior to vesting, satisfied without the issuance of Stock, expire or are otherwise
terminated (other than by exercise) shall be added back to the shares of Stock available for issuance under the Plan and, to the extent permitted under Section 422 of the Code and the regulations promulgated thereunder, the shares of Stock that
may be issued as Incentive Stock Options. In the event the Company repurchases shares of Stock on the open market, such shares shall not be added to the shares of Stock available for issuance under the Plan. Subject to such overall limitations,
shares of Stock may be issued up to such maximum number pursuant to any type or types of Award. The shares available for issuance under the Plan may be authorized but unissued shares of Stock or
shares of Stock reacquired by the Company. 
 (b)    Maximum Awards to
Non-Employee Directors. Notwithstanding anything to the contrary in this Plan, the value of all Awards awarded under this Plan and all other cash compensation paid by the Company to any Non-Employee Director in any calendar year for services as a Non-Employee Director shall not exceed: (i) $1,000,000 in the first calendar year an individual becomes a Non-Employee Director and (ii) $750,000 in any other calendar year. For the purpose of this limitation, the value of any Award shall be its grant date fair value, as determined in accordance with ASC 718 or
successor provision but excluding the impact of estimated forfeitures related to service-based vesting provisions. 

(c)    Changes in Stock. Subject to Section 3(d) hereof, if, as a result of any reorganization,
recapitalization, reclassification, stock dividend, stock split, reverse stock split or other similar change in the Company’s capital stock, the outstanding shares of Stock are increased or decreased or are exchanged for a different number or
kind of shares or other securities of the Company, or additional shares or new or different shares or other securities of the Company or other non-cash assets are distributed with respect to such shares of
Stock or other securities, or, if, as a result of any merger or consolidation, sale of all or substantially all of the assets of the Company, the outstanding shares of Stock are converted into or exchanged for securities of the Company or any
successor entity (or a parent or subsidiary thereof), the Administrator shall make an appropriate or proportionate adjustment in (i) the maximum number of shares reserved for issuance under the Plan, including the maximum number of shares that
may be issued in the form of Incentive Stock Options, (ii) the number and kind of shares or other securities subject to any then outstanding Awards under the Plan, (iii) the repurchase price, if any, per share subject to each outstanding
Restricted Stock Award, and (iv) the exercise price for each share subject to any then outstanding Stock Options and Stock Appreciation Rights under the Plan, without changing the aggregate exercise price (i.e., the exercise price multiplied by
the number of shares subject to Stock Options and Stock Appreciation Rights) as to which such Stock Options and Stock Appreciation Rights remain exercisable. The Administrator shall also make equitable or proportionate adjustments in the number of
shares subject to outstanding Awards and the exercise price and the terms of outstanding Awards to take into consideration cash dividends paid other than in the ordinary course or any other extraordinary corporate event. The adjustment by the
Administrator shall be final, binding and conclusive. No fractional shares of Stock shall be issued under the Plan resulting from any such adjustment, but the Administrator in its discretion may make a cash payment in lieu of fractional shares. 

  
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 (d)    Mergers and Other Transactions. In the case of and subject
to the consummation of a Sale Event, the parties thereto may cause the assumption or continuation of Awards theretofore granted by the successor entity, or the substitution of such Awards with new Awards of the successor entity or parent thereof,
with appropriate adjustment as to the number and kind of shares and, if appropriate, the per share exercise prices, as such parties shall agree. To the extent the parties to such Sale Event do not provide for the assumption, continuation or
substitution of Awards, upon the effective time of the Sale Event, the Plan and all outstanding Awards granted hereunder shall terminate. In such case, except as may be otherwise provided in the relevant Award Agreement, all Options and Stock
Appreciation Rights with time-based vesting conditions or restrictions that are not vested and/or exercisable immediately prior to the effective time of the Sale Event shall become fully vested and exercisable as of the effective time of the Sale
Event, all other Awards with time-based vesting, conditions or restrictions shall become fully vested and nonforfeitable as of the effective time of the Sale Event, and all Awards with conditions and restrictions relating to the attainment of
performance goals may become vested and nonforfeitable in connection with a Sale Event in the Administrator’s discretion or to the extent specified in the relevant Award Agreement. In the event of such termination, (i) the Company shall
have the option (in its sole discretion) to make or provide for a payment, in cash or in kind, to the grantees holding Options and Stock Appreciation Rights, in exchange for the cancellation thereof, in an amount equal to the difference between
(A) the Sale Price multiplied by the number of shares of Stock subject to outstanding Options and Stock Appreciation Rights (to the extent then exercisable at prices not in excess of the Sale Price) and (B) the aggregate exercise price of
all such outstanding Options and Stock Appreciation Rights (provided that, in the case of an Option or Stock Appreciation Right with an exercise price equal to or greater than the Sale Price, such Option or Stock Appreciation Right shall be
cancelled for no consideration); or (ii) each grantee shall be permitted, within a specified period of time prior to the consummation of the Sale Event as determined by the Administrator, to exercise all outstanding Options and Stock
Appreciation Rights (to the extent then exercisable) held by such grantee. The Company shall also have the option (in its sole discretion) to make or provide for a payment, in cash or in kind, to the grantees holding other Awards in an amount equal
to the Sale Price multiplied by the number of vested shares of Stock under such Awards. 

  
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	SECTION	  4.     ELIGIBILITY 

Grantees under the Plan will be such employees, Non-Employee Directors or Consultants of the Company
and its Affiliates as are selected from time to time by the Administrator in its sole discretion; provided that Awards may not be granted to employees, Non-Employee Directors or Consultants who are providing
services only to any “parent” of the Company, as such term is defined in Rule 405 of the Act, unless (i) the stock underlying the Awards is treated as “service recipient stock” under Section 409A or (ii) the
Company has determined that such Awards are exempt from or otherwise comply with Section 409A. 
  

	SECTION	  5.     STOCK OPTIONS 

(a)    Award of Stock Options. The Administrator may grant Stock Options under the Plan. Any Stock Option granted
under the Plan shall be in such form as the Administrator may from time to time approve. 
 Stock Options granted under the Plan may be
either Incentive Stock Options or Non-Qualified Stock Options. Incentive Stock Options may be granted only to employees of the Company or any Subsidiary that is a “subsidiary corporation” within the
meaning of Section 424(f) of the Code. To the extent that any Option does not qualify as an Incentive Stock Option, it shall be deemed a Non-Qualified Stock Option. 

Stock Options granted pursuant to this Section 5 shall be subject to the following terms and conditions and shall contain such additional
terms and conditions, not inconsistent with the terms of the Plan, as the Administrator shall deem desirable. If the Administrator so determines, Stock Options may be granted in lieu of cash compensation at the optionee’s election, subject to
such terms and conditions as the Administrator may establish. 
 (b)    Exercise Price. The exercise price per
share for the Stock covered by a Stock Option granted pursuant to this Section 5 shall be determined by the Administrator at the time of grant but shall not be less than 100 percent of the Fair Market Value on the date of grant. In the
case of an Incentive Stock Option that is granted to a Ten Percent Owner, the exercise price of such Incentive Stock Option shall be not less than 110 percent of the Fair Market Value on the date of grant. Notwithstanding the foregoing, Stock
Options may be granted with an exercise price per share that is less than 100 percent of the Fair Market Value on the date of grant (i) pursuant to a transaction described in, and in a manner consistent with, Section 424(a) of the
Code, (ii) to individuals who are not subject to U.S. income tax on the date of grant or (iii) if the Stock Option is otherwise compliant with Section 409A. 

(c)    Option Term. The term of each Stock Option shall be fixed by the Administrator, but no Stock Option shall be
exercisable more than ten years after the date the Stock Option is granted. In the case of an Incentive Stock Option that is granted to a Ten Percent Owner, the term of such Stock Option shall be no more than five years from the date of grant. 

(d)    Exercisability; Rights of a Stockholder. Stock Options shall become exercisable at such time or times,
whether or not in installments, as shall be determined by the Administrator at or after the date of grant. The Administrator may at any time accelerate the exercisability of all or any portion of any Stock Option. An optionee shall have the rights
of a stockholder only as to shares acquired upon the exercise of a Stock Option and not as to unexercised Stock Options. 

  
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 (e)    Method of Exercise. Stock Options may be exercised in
whole or in part, by giving written or electronic notice of exercise to the Company, specifying the number of shares to be purchased. Payment of the purchase price may be made by one or more of the following methods except to the extent otherwise
provided in the Award Agreement: 
 (i)    In cash, by certified or bank check or other instrument acceptable to the
Administrator; 
 (ii)    Through the delivery (or attestation to the ownership following such procedures as the Company
may prescribe) of shares of Stock that are not then subject to restrictions under any Company plan. Such surrendered shares shall be valued at Fair Market Value on the exercise date; 

(iii)    By the optionee delivering to the Company a properly executed exercise notice together with irrevocable
instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company for the purchase price; provided that in the event the optionee chooses to pay the purchase price as so provided, the optionee and the
broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Company shall prescribe as a condition of such payment procedure; or 

(iv)    With respect to Stock Options that are not Incentive Stock Options, by a “net exercise” arrangement
pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed the aggregate exercise price. 

Payment instruments will be received subject to collection. The transfer to the optionee on the records of the Company or of the transfer agent of the shares
of Stock to be purchased pursuant to the exercise of a Stock Option will be contingent upon receipt from the optionee (or a purchaser acting in his stead in accordance with the provisions of the Stock Option) by the Company of the full purchase
price for such shares and the fulfillment of any other requirements contained in the Award Agreement or applicable provisions of laws (including the satisfaction of any withholding taxes that the Company or an Affiliate is obligated to withhold with
respect to the optionee). In the event an optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock transferred to the optionee upon the exercise of the Stock Option
shall be net of the number of attested shares. In the event that the Company establishes, for itself or using the services of a third party, an automated system for the exercise of Stock Options, such as a system using an internet website or
interactive voice response, then the paperless exercise of Stock Options may be permitted through the use of such an automated system. 

(f)    Annual Limit on Incentive Stock Options. To the extent required for “incentive stock option”
treatment under Section 422 of the Code, the aggregate Fair Market Value (determined as of the time of grant) of the shares of Stock with respect to which Incentive Stock Options granted under this Plan and any other plan of the Company or its
parent and subsidiary corporations become exercisable for the first time by an optionee during any calendar year shall not exceed $100,000. To the extent that any Stock Option exceeds this limit, it shall constitute a
Non-Qualified Stock Option. 

  
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	SECTION	  6.     STOCK APPRECIATION RIGHTS 

(a)    Award of Stock Appreciation Rights. The Administrator may grant Stock Appreciation Rights under the Plan. A
Stock Appreciation Right is an Award entitling the recipient to receive shares of Stock (or cash, to the extent explicitly provided for in the applicable Award Agreement) having a value equal to the excess of the Fair Market Value of a share of
Stock on the date of exercise over the exercise price of the Stock Appreciation Right multiplied by the number of shares of Stock with respect to which the Stock Appreciation Right shall have been exercised. 

(b)    Exercise Price of Stock Appreciation Rights. The exercise price of a Stock Appreciation Right shall not be
less than 100 percent of the Fair Market Value of the Stock on the date of grant. 
 (c)    Grant and Exercise
of Stock Appreciation Rights. Stock Appreciation Rights may be granted by the Administrator independently of any Stock Option granted pursuant to Section 5 of the Plan. 

(d)    Terms and Conditions of Stock Appreciation Rights. Stock Appreciation Rights shall be subject to such terms
and conditions as shall be determined on the date of grant by the Administrator. The term of a Stock Appreciation Right may not exceed ten years. The terms and conditions of each such Award shall be determined by the Administrator, and such terms
and conditions may differ among individual Awards and grantees. 
  

	SECTION	  7.     RESTRICTED STOCK AWARDS 

(a)    Nature of Restricted Stock Awards. The Administrator may grant Restricted Stock Awards under the Plan. A
Restricted Stock Award is any Award of Restricted Shares subject to such restrictions and conditions as the Administrator may determine at the time of grant. Conditions may be based on continuing employment (or other Service Relationship) and/or
achievement of pre-established performance goals and objectives. 

(b)    Rights as a Stockholder. Upon the grant of the Restricted Stock Award and payment of any applicable purchase
price, a grantee shall have the rights of a stockholder with respect to the voting of the Restricted Shares and receipt of dividends; provided that if the lapse of restrictions with respect to the Restricted Stock Award is tied to the attainment of
performance goals, any dividends paid by the Company during the performance period shall accrue and shall not be paid to the grantee until and to the extent the performance goals are met with respect to the Restricted Stock Award. Unless the
Administrator shall otherwise determine, (i) uncertificated Restricted Shares shall be accompanied by a notation on the records of the Company or the transfer agent to the effect that they are subject to forfeiture until such Restricted Shares
are vested as provided in Section 7(d) below, and (ii) certificated Restricted Shares shall remain in the possession of the Company until such Restricted Shares are vested as provided in Section 7(d) below, and the grantee shall be
required, as a condition of the grant, to deliver to the Company such instruments of transfer as the Administrator may prescribe. 

  
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 (c)    Restrictions. Restricted Shares may not be sold, assigned,
transferred, pledged or otherwise encumbered or disposed of except as specifically provided herein or in the Restricted Stock Award Agreement. Except as may otherwise be provided by the Administrator either in the Award Agreement or, subject to
Section 16 below, in writing after the Award is issued, if a grantee’s employment (or other Service Relationship) with the Company and its Affiliates terminates for any reason, any Restricted Shares that have not vested at the time of
termination shall automatically and without any requirement of notice to such grantee from or other action by or on behalf of, the Company be deemed to have been reacquired by the Company at its original purchase price (if any) from such grantee or
such grantee’s legal representative simultaneously with such termination of employment (or other Service Relationship), and thereafter shall cease to represent any ownership of the Company by the grantee or rights of the grantee as a
stockholder. Following such deemed reacquisition of Restricted Shares that are represented by physical certificates, a grantee shall surrender such certificates to the Company upon request without consideration. 

(d)    Vesting of Restricted Shares. The Administrator at the time of grant shall specify the date or dates and/or
the attainment of pre-established performance goals, objectives and other conditions on which the non-transferability of the Restricted Shares and the Company’s
right of repurchase or forfeiture shall lapse. Subsequent to such date or dates and/or the attainment of such pre-established performance goals, objectives and other conditions, the shares on which all
restrictions have lapsed shall no longer be Restricted Shares and shall be deemed “vested.” 
  

	SECTION	  8.     RESTRICTED STOCK UNITS 

(a)    Nature of Restricted Stock Units. The Administrator may grant Restricted Stock Units under the Plan. A
Restricted Stock Unit is an Award of stock units that may be settled in shares of Stock (or cash, to the extent explicitly provided for in the Award Agreement) upon the satisfaction of such restrictions and conditions at the time of grant.
Conditions may be based on continuing employment (or other Service Relationship) and/or achievement of pre-established performance goals and objectives. The terms and conditions of each such Award shall be
determined by the Administrator, and such terms and conditions may differ among individual Awards and grantees. Except in the case of Restricted Stock Units with a deferred settlement date that complies with Section 409A, at the end of the
vesting period, the Restricted Stock Units, to the extent vested, shall be settled in the form of shares of Stock. Restricted Stock Units with deferred settlement dates are subject to Section 409A and shall contain such additional terms and
conditions as the Administrator shall determine in its sole discretion in order to comply with the requirements of Section 409A. 

(b)    Election to Receive Restricted Stock Units in Lieu of Compensation. The Administrator may, in its sole
discretion, permit a grantee to elect to receive a portion of future cash compensation otherwise due to such grantee in the form of an award of Restricted Stock Units. Any such election shall be made in writing and shall be delivered to the Company
no later than the date specified by the Administrator and in accordance with Section 409A and such other rules and procedures established by the Administrator. Any such future cash compensation that the grantee elects to defer shall be
converted to a fixed number of Restricted Stock Units based on the Fair Market Value of Stock on the date the compensation would otherwise have been paid to the grantee if such payment had not been deferred as provided herein. The Administrator
shall have the sole right to determine whether and under what circumstances to permit such elections and to impose such limitations and other terms and conditions thereon as the Administrator deems appropriate. Any Restricted Stock Units that are
elected to be received in lieu of cash compensation shall be fully vested, unless otherwise provided in the Award Agreement. 

  
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 (c)    Rights as a Stockholder. A grantee shall have the rights
as a stockholder only as to shares of Stock acquired by the grantee upon settlement of Restricted Stock Units; provided, however, that the grantee may be credited with Dividend Equivalent Rights with respect to the stock units underlying his or her
Restricted Stock Units, subject to the provisions of Section 11 and such terms and conditions as the Administrator may determine. 

(d)    Termination. Except as may otherwise be provided by the Administrator either in the Award Agreement or,
subject to Section 16 below, in writing after the Award is issued, a grantee’s right in all Restricted Stock Units that have not vested shall automatically terminate upon the grantee’s termination of employment (or cessation of
Service Relationship) with the Company and its Subsidiaries for any reason. 
  

	SECTION	  9.     UNRESTRICTED STOCK AWARDS 

Grant or Sale of Unrestricted Stock. The Administrator may grant (or sell at par value or such higher purchase price determined by the
Administrator) an Unrestricted Stock Award under the Plan. An Unrestricted Stock Award is an Award pursuant to which the grantee may receive shares of Stock free of any restrictions under the Plan. Unrestricted Stock Awards may be granted in respect
of past services or other valid consideration, or in lieu of cash compensation due to such grantee. 
  

	SECTION	  10.     CASH-BASED AWARDS 

Grant of Cash-Based Awards. The Administrator may grant Cash-Based Awards under the Plan. A Cash-Based Award is an Award that entitles
the grantee to a payment in cash upon the attainment of specified performance goals, including continued employment (or other Service Relationship). The Administrator shall determine the maximum duration of the Cash-Based Award, the amount of cash
to which the Cash-Based Award pertains, the conditions upon which the Cash-Based Award shall become vested or payable, and such other provisions as the Administrator shall determine. Each Cash-Based Award shall specify a cash-denominated payment
amount, formula or payment ranges as determined by the Administrator. Payment, if any, with respect to a Cash-Based Award shall be made in accordance with the terms of the Award and may be made in cash. 

 

	SECTION	  11.     DIVIDEND EQUIVALENT RIGHTS 

(a)    Dividend Equivalent Rights. The Administrator may grant Dividend Equivalent Rights under the Plan. A Dividend
Equivalent Right is an Award entitling the grantee to receive credits based on cash dividends that would have been paid on the shares of Stock specified in the Dividend Equivalent Right (or other Award to which it relates) if such shares had been
issued to the grantee. A Dividend Equivalent Right may be granted hereunder to any grantee as a component of an award of Restricted Stock Units or as a freestanding award. The terms and conditions of Dividend Equivalent Rights shall be specified in
the Award Agreement. Dividend equivalents credited to the holder of a Dividend Equivalent Right may be paid currently or may be deemed to be reinvested in additional shares of Stock, which may thereafter accrue additional equivalents. Any such
reinvestment shall be at Fair Market Value on the date of reinvestment or such other price as may then apply under a dividend reinvestment plan sponsored by the Company, if any. Dividend Equivalent Rights may be settled in cash or shares of Stock or
a combination thereof, in a single installment or installments. A Dividend Equivalent Right granted as a component of an Award of Restricted Stock Units shall provide that such Dividend Equivalent Right shall be settled only upon settlement or
payment of, or lapse of restrictions on, such other Award, and that such Dividend Equivalent Right shall expire or be forfeited or annulled under the same conditions as such other Award. 

  
 12 

 (b)    Termination. Except as may otherwise be provided by the
Administrator either in the Award Agreement or, subject to Section 16 below, in writing after the Award is issued, a grantee’s rights in all Dividend Equivalent Rights shall automatically terminate upon the grantee’s cessation of
Service Relationship for any reason. 
  

	SECTION	  12.     TRANSFERABILITY OF AWARDS 

(a)    Transferability. Except as provided in Section 12(b) below, during a grantee’s lifetime, his or her
Awards shall be exercisable only by the grantee, or by the grantee’s legal representative or guardian in the event of the grantee’s incapacity. No Awards shall be sold, assigned, transferred or otherwise encumbered or disposed of by a
grantee other than by will or by the laws of descent and distribution or pursuant to a domestic relations order. No Awards shall be subject, in whole or in part, to attachment, execution, or levy of any kind, and any purported transfer in violation
hereof shall be null and void. 
 (b)    Administrator Action. Notwithstanding Section 12(a), the
Administrator, in its discretion, may provide either in the Award Agreement regarding a given Award or by subsequent written approval that the grantee (who is an employee or director) may transfer his or her
Non-Qualified Stock Options to his or her immediate family members, to trusts for the benefit of such family members, or to partnerships in which such family members are the only partners, provided that the
transferee agrees in writing with the Company to be bound by all of the terms and conditions of this Plan and the applicable Award. In no event may an Award be transferred by a grantee for value. 

(c)    Family Member. For purposes of Section 12(b), “family member” shall mean a grantee’s
child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or sister-in-law, including adoptive relationships, any person sharing the
grantee’s household (other than a tenant of the grantee), a trust in which these persons (or the grantee) have more than 50 percent of the beneficial interest, a foundation in which these persons (or the grantee) control the management of
assets, and any other entity in which these persons (or the grantee) own more than 50 percent of the voting interests. 

  
 13 

 (d)    Designation of Beneficiary. To the extent permitted by the
Company, each grantee to whom an Award has been made under the Plan may designate a beneficiary or beneficiaries to exercise any Award or receive any payment under any Award payable on or after the grantee’s death. Any such designation shall be
on a form provided for that purpose by the Administrator and shall not be effective until received by the Administrator. If no beneficiary has been designated by a deceased grantee, or if the designated beneficiaries have predeceased the grantee,
the beneficiary shall be the grantee’s estate. 
  

	SECTION	  13.     TAX WITHHOLDING 

(a)    Payment by Grantee. Each grantee shall, no later than the date as of which the value of an Award or of any
Stock or other amounts received thereunder first becomes includable in the gross income of the grantee for Federal income tax purposes, pay to the Company, or make arrangements satisfactory to the Administrator regarding payment of, any Federal,
state, or local taxes of any kind required by law to be withheld by the Company with respect to such income. The Company and its Subsidiaries shall, to the extent permitted by law, have the right to deduct any such taxes from any payment of any kind
otherwise due to the grantee. The Company’s obligation to deliver evidence of book entry (or stock certificates) to any grantee is subject to and conditioned on tax withholding obligations being satisfied by the grantee. 

(b)    Payment in Stock. The Administrator may require the Company’s tax withholding obligation to be
satisfied, in whole or in part, by the Company withholding from shares of Stock to be issued pursuant to any Award a number of shares with an aggregate Fair Market Value (as of the date the withholding is effected) that would satisfy the withholding
amount due; provided, however, that the amount withheld does not exceed the maximum statutory tax rate or such lesser amount as is necessary to avoid liability accounting treatment. For purposes of share withholding, the Fair Market Value of
withheld shares shall be determined in the same manner as the value of Stock includible in income of the grantees. The Administrator may also require the Company’s tax withholding obligation to be satisfied, in whole or in part, by an
arrangement whereby a certain number of shares of Stock issued pursuant to any Award are immediately sold and proceeds from such sale are remitted to the Company in an amount that would satisfy the withholding amount due. 

 

	SECTION	  14.     SECTION 409A AWARDS 

Awards are intended to be exempt from Section 409A to the greatest extent possible and to otherwise comply with Section 409A. The
Plan and all Awards shall be interpreted in accordance with such intent. To the extent that any Award is determined to constitute “nonqualified deferred compensation” within the meaning of Section 409A (a “409A Award”), the
Award shall be subject to such additional rules and requirements as specified by the Administrator from time to time in order to comply with Section 409A. In this regard, if any amount under a 409A Award is payable upon a “separation from
service” (within the meaning of Section 409A) to a grantee who is then considered a “specified employee” (within the meaning of Section 409A), then no such payment shall be made prior to the date that is the earlier of
(i) six months and one day after the grantee’s separation from service, or (ii) the grantee’s death, but only to the extent such delay is necessary to prevent such payment from being subject to interest, penalties and/or
additional tax imposed pursuant to Section 409A. Further, the settlement of any 409A Award may not be accelerated except to the extent permitted by Section 409A. 

  
 14 

	SECTION	  15.     TERMINATION OF SERVICE RELATIONSHIP, TRANSFER, LEAVE OF ABSENCE, ETC.

 (a)    Termination of Service Relationship. If the grantee’s Service Relationship is
with an Affiliate and such Affiliate ceases to be an Affiliate, the grantee shall be deemed to have terminated his or her Service Relationship for purposes of the Plan. 

(b)    For purposes of the Plan, the following events shall not be deemed a termination of a Service Relationship: 

(i)    a transfer to the employment of the Company from an Affiliate or from the Company to an Affiliate, or from one
Affiliate to another; or 
 (ii)    an approved leave of absence for military service or sickness, or for any other
purpose approved by the Company, if the employee’s right to re-employment is guaranteed either by a statute or by contract or under the policy pursuant to which the leave of absence was granted or if the
Administrator otherwise so provides in writing. 
  

	SECTION	  16.     AMENDMENTS AND TERMINATION 

The Board may, at any time, amend or discontinue the Plan and the Administrator may, at any time, amend or cancel any outstanding Award for the
purpose of satisfying changes in law or for any other lawful purpose, but no such action shall materially and adversely affect rights under any outstanding Award without the holder’s consent. The Administrator is specifically authorized to
exercise its discretion to reduce the exercise price of outstanding Stock Options or Stock Appreciation Rights or effect the repricing of such Awards through cancellation and re-grants. To the extent required
under the rules of any securities exchange or market system on which the Stock is listed, to the extent determined by the Administrator to be required by the Code to ensure that Incentive Stock Options granted under the Plan are qualified under
Section 422 of the Code, or to the extent otherwise required by applicable laws, Plan amendments shall be subject to approval by Company stockholders. Nothing in this Section 16 shall limit the Administrator’s authority to take any
action permitted pursuant to Section 3(c) or 3(d). 
  

	SECTION	  17.     STATUS OF PLAN 

With respect to the portion of any Award that has not been exercised and any payments in cash, Stock or other consideration not received by a
grantee, a grantee shall have no rights greater than those of a general creditor of the Company unless the Administrator shall otherwise expressly determine in connection with any Award or Awards. In its sole discretion, the Administrator may
authorize the creation of trusts or other arrangements to meet the Company’s obligations to deliver Stock or make payments with respect to Awards hereunder, provided that the existence of such trusts or other arrangements is consistent with the
foregoing sentence. 

  
 15 

	SECTION	  18.     GENERAL PROVISIONS 

(a)    No Distribution. The Administrator may require each person acquiring Stock pursuant to an Award to represent
to and agree with the Company in writing that such person is acquiring the shares without a view to distribution thereof. 

(b)    Issuance of Stock. To the extent certificated, stock certificates to grantees under this Plan shall be
deemed delivered for all purposes when the Company or a stock transfer agent of the Company shall have mailed such certificates in the United States mail, addressed to the grantee, at the grantee’s last known address on file with the Company.
Uncertificated Stock shall be deemed delivered for all purposes when the Company or a Stock transfer agent of the Company shall have given to the grantee by electronic mail (with proof of receipt) or by United States mail, addressed to the grantee,
at the grantee’s last known address on file with the Company, notice of issuance and recorded the issuance in its records (which may include electronic “book entry” records). Notwithstanding anything herein to the contrary, the
Company shall not be required to issue or deliver any evidence of book entry or certificates evidencing shares of Stock pursuant to the exercise or settlement of any Award, unless and until the Administrator has determined, with advice of counsel
(to the extent the Administrator deems such advice necessary or advisable), that the issuance and delivery is in compliance with all applicable laws, regulations of governmental authorities and, if applicable, the requirements of any exchange on
which the shares of Stock are listed, quoted or traded. Any Stock issued pursuant to the Plan shall be subject to any stop-transfer orders and other restrictions as the Administrator deems necessary or advisable to comply with federal, state or
foreign jurisdiction, securities or other laws, rules and quotation system on which the Stock is listed, quoted or traded. The Administrator may place legends on any Stock certificate or notations on any book entry to reference restrictions
applicable to the Stock. In addition to the terms and conditions provided herein, the Administrator may require that an individual make such reasonable covenants, agreements, and representations as the Administrator, in its discretion, deems
necessary or advisable in order to comply with any such laws, regulations, or requirements. The Administrator shall have the right to require any individual to comply with any timing or other restrictions with respect to the settlement or exercise
of any Award, including a window-period limitation, as may be imposed in the discretion of the Administrator. 

(c)    Stockholder Rights. Until Stock is deemed delivered in accordance with Section 18(b), no right to vote
or receive dividends or any other rights of a stockholder will exist with respect to shares of Stock to be issued in connection with an Award, notwithstanding the exercise of a Stock Option or any other action by the grantee with respect to an
Award. 
 (d)    Other Compensation Arrangements; No Rights to Continued Service Relationship. Nothing contained
in this Plan shall prevent the Board from adopting other or additional compensation arrangements, including trusts, and such arrangements may be either generally applicable or applicable only in specific cases. The adoption of this Plan and the
grant of Awards do not confer upon any grantee any right to continued Service Relationship. 
 (e)    Trading Policy
Restrictions. Option exercises and other Awards under the Plan shall be subject to the Company’s insider trading policies and procedures, as in effect from time to time. 

  
 16 

 (f)    Clawback Policy. Awards under the Plan shall be subject to
the Company’s clawback policy, as the same be adopted or in effect from time to time. 
  

	SECTION	  19.     EFFECTIVE DATE OF PLAN 

This Plan shall become effective upon the date immediately preceding the Registration Date subject to prior stockholder approval in accordance
with applicable state law, the Company’s bylaws and articles of incorporation, and applicable stock exchange rules. No grants of Stock Options and other Awards may be made hereunder after the tenth anniversary of the Effective Date and no
grants of Incentive Stock Options may be made hereunder after the tenth anniversary of the date the Plan is approved by the Board. 
  

	SECTION	  20.     GOVERNING LAW 

This Plan and all Awards and actions taken thereunder shall be governed by, and construed in accordance with the General Corporation Law of the
State of Delaware as to matters within the scope thereof, and as to all other matters shall be governed by and construed in accordance with the internal laws of the Commonwealth of Massachusetts applied without regard to conflict of law principles
that would result in the application of any law other than the law of the Commonwealth of Massachusetts. 
 DATE APPROVED BY BOARD OF DIRECTORS: July 2,
2020 
 DATE APPROVED BY STOCKHOLDERS: July 22, 2020 

  
 17 

 NON-QUALIFIED STOCK OPTION AGREEMENT 

FOR COMPANY CONSULTANTS 

UNDER THE ALLOVIR, INC. 

2020 STOCK OPTION AND GRANT PLAN 
  

			
	Name of Optionee:	  	                                     
                                         
  
		
	No. of Option Shares:	  	                                     
   
		
	Option Exercise Price per Share:	  	$                                     
 
		  	[FMV on Grant Date]
		
	Grant Date:	  	                                     
   
		
	Expiration Date:	  	                                     
   
		  	[No more than 10 years]

 Pursuant to the AlloVir, Inc. 2020 Stock Option and Grant Plan (the “Plan”), AlloVir, Inc. (the
“Company”) hereby grants to the Optionee named above an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the number of shares of Common Stock, par value $0.0001 per share
(the “Stock”) of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan. This Stock Option is not intended to be an “incentive stock
option” under Section 422 of the Internal Revenue Code of 1986, as amended. 
 1.    Exercisability
Schedule. No portion of this Stock Option may be exercised until such portion shall have become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to
accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to the following number of Option Shares on the dates indicated so long as Optionee continues to have a Service Relationship with the Company or a
Subsidiary on such dates: 
  

			
	 Incremental Number of
Option Shares
Exercisable
	  	 Exercisability Date

	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        

 Once exercisable, this Stock Option shall continue to be exercisable at any time or times prior to the close
of business on the Expiration Date, subject to the provisions hereof and of the Plan. 

 2.    Manner of Exercise. 

(a)    The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the
Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of
Option Shares to be purchased. 
 Payment of the purchase price for the Option Shares may be made by one or more of the following methods:
(i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that
are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; (iii) by the Optionee delivering to the Company a
properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee
chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such
payment procedure; (iv) by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed
the aggregate exercise price; or (v) a combination of (i), (ii), (iii) and (iv) above. Payment instruments will be received subject to collection. 

The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the
Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and
(iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent
resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock
transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to. 
 (b)    The
shares of Stock purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable
laws or regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be
the holder of, or to have any of the rights of a holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent
shall have transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights
with respect to such shares of Stock. 

  
 2 

 (c)    The minimum number of shares with respect to which this Stock
Option may be exercised at any one time shall be 100 shares, unless the number of shares with respect to which this Stock Option is being exercised is the total number of shares subject to exercise under this Stock Option at the time. 

(d)    Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable
after the Expiration Date hereof. 
 3.    Termination of Service Relationship. Except as may otherwise be
provided by the Administrator, if the Optionee’s Service Relationship with the Company or a Subsidiary (as defined in the Plan) is terminated, the period within which to exercise the Stock Option may be subject to earlier termination as set
forth below. 
 (a)    Termination Due to Death. If the Optionee’s Service Relationship with the Company or
a Subsidiary terminates by reason of the Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised by the Optionee’s legal representative or
legatee for a period of 12 months from the date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate immediately and be of no further force or effect. 

(b)    Termination Due to Disability. If the Optionee’s Service Relationship with the Company or a Subsidiary
terminates by reason of the Optionee’s disability (as determined by the Administrator), any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of such termination, may thereafter be exercised by the
Optionee for a period of 12 months from the date of disability or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of disability shall terminate immediately and be of no further force or
effect. 
 (c)    Termination for Cause. If the Optionee’s Service Relationship with the Company or a
Subsidiary terminates for Cause, any portion of this Stock Option outstanding on such date shall terminate immediately and be of no further force and effect. Other Termination. If the Optionee’s Service Relationship with the Company or a
Subsidiary terminates for any reason other than the Optionee’s death, the Optionee’s disability or Cause, and unless otherwise determined by the Administrator, any portion of this Stock Option outstanding on such date may be exercised, to
the extent exercisable on the date of termination, for a period of three months from the date of termination or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of termination shall
terminate immediately and be of no further force or effect. 
 The Administrator’s determination of the reason for termination of the
Optionee’s Service Relationship with the Company or a Subsidiary shall be conclusive and binding on the Optionee and his or her representatives or legatees. 

  
 3 

 4.    Incorporation of Plan. Notwithstanding anything herein to
the contrary, this Stock Option shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the
meaning specified in the Plan, unless a different meaning is specified herein. 
 5.    Transferability. This
Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option
is exercisable, during the Optionee’s lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee. 

6.    Responsibility for Taxes. 

(a)    The Optionee acknowledges that, regardless of any action taken by the Company or, if different, the Subsidiary for
which the Optionee provides services Optionee (the “Service Recipient”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other
tax-related items related to the Optionee’s participation in the Plan and legally applicable to the Optionee (“Tax-Related Items”) is and remains the
Optionee’s responsibility and may exceed the amount, if any, actually withheld by the Company or the Service Recipient. The Optionee further acknowledges that the Company and/or the Service Recipient (i) make no representations or
undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of this Stock Option, including, but not limited to, the grant, vesting or exercise of this Stock Option, the
subsequent sale of shares of Stock acquired pursuant to such exercise and the receipt of any dividends; and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of this Stock Option to reduce or
eliminate the Optionee’s liability for Tax-Related Items or achieve any particular tax result. Further, if the Optionee is subject to Tax-Related Items in more than
one jurisdiction, the Optionee acknowledges that the Company and/or the Service Recipient (or former service recipient, as applicable) may be required to withhold or account for Tax-Related Items in more than
one jurisdiction. 
 (b)    Prior to any relevant taxable or tax withholding event, as applicable, the Optionee agrees
to make adequate arrangements satisfactory to the Company and/or the Service Recipient to satisfy all Tax-Related Items. In this regard, the Optionee authorizes the Company and/or the Service Recipient, or
their respective agents, at their discretion, to satisfy any applicable withholding obligations with regard to all Tax-Related Items by one or a combination of the following: (i) withholding from the
Optionee’s wages or other cash compensation paid to the Optionee by the Company and/or the Service Recipient; (ii) allowing or requiring the Optionee to make a cash payment to cover the Tax-Related
Items; (iii) withholding from proceeds of the sale of shares of Stock acquired upon exercise of this Stock Option either through a voluntary sale or through a mandatory sale arranged by the Company (on the Optionee’s behalf pursuant to
this authorization without further consent); (iv) withholding from the shares of Stock to be issued to the Optionee upon exercise of this Stock Option; or (v) any other method of withholding
determined by the Company and permitted by applicable law; provided, however, that that if the Optionee is a Section 16 officer of the Company under the Exchange Act, in which case, the obligation for
Tax-Related Items may be satisfied only by one or a combination of methods (i), (ii) and (iii) above. 

  
 4 

 (c)    Depending on the withholding method, the Company and/or the
Service Recipient may withhold or account for Tax-Related Items by considering applicable statutory withholding amounts or other applicable withholding rates, including maximum rates applicable in the
Optionee’s jurisdiction, in which case the Optionee may receive a refund of any over-withheld amount in cash and will have no entitlement to the equivalent amount in shares of Stock. If the obligation for
Tax-Related Items is satisfied by withholding in shares of Stock, for tax purposes, the Optionee is deemed to have been issued the full number of shares of Stock subject to the exercised Stock Option,
notwithstanding that a number of the shares of Stock is held back solely for the purpose of paying the Tax-Related Items. 

(d)    The Optionee agrees to pay to the Company or the Service Recipient any amount of
Tax-Related Items that the Service Recipient or the Employer may be required to withhold or account for as a result of the Optionee’s participation in the Plan that cannot be satisfied by the means
previously described. The Company may refuse to issue or deliver the shares of Stock, or the proceeds of the sale of shares of Stock, if the Optionee fails to comply with his or her obligations in connection with the
Tax-Related Items. 
 7.    No Obligation to Continue Service
Relationship. Neither the Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Optionee’s Service Relationship with the Company or a Subsidiary and neither the Plan nor this Agreement shall
interfere in any way with the right of the Company or any Subsidiary to terminate the Optionee’s Service Relationship with the Company or a Subsidiary at any time. 

8.    Integration. This Agreement constitutes the entire agreement between the parties with respect to this Stock
Option and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

9.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future
equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the Relevant
Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider
appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

10.    Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business
and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing. 

  
 5 

 11.    Waivers. The Optionee acknowledges that a waiver by the
Company of breach of any provision of this Agreement shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Optionee or any other Optionee. 

12.    Severability. The provisions of this Agreement are severable and if any one or more provisions are
determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable. 

13.    Electronic Delivery and Acceptance of Documents. The Company may, in its sole discretion, decide to deliver
any documents related to current or future participation in the Plan by electronic means. The Optionee hereby consents to receive such documents by electronic delivery and agree to participate in the Plan through an
on-line or electronic system established and maintained by the Company or a third party designated by the Company. 
  

			
	AlloVir, Inc.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable. 

 

			
	 Dated:
	 	
 

	
	  

Optionee’s Signature

	
	Optionee’s name and address:
	  

	  

	  

 
 

  
 6 

 NON-QUALIFIED STOCK OPTION AGREEMENT 

FOR NON-EMPLOYEE DIRECTORS 

UNDER THE ALLOVIR, INC. 

2020 STOCK OPTION AND GRANT PLAN 
  

			
	Name of Optionee:	  	                                     
                                         
  
		
	No. of Option Shares:	  	                                     
   
		
	Option Exercise Price per Share:	  	$                                     
 
		  	[FMV on Grant Date]
		
	Grant Date:	  	                                     
   
		
	Expiration Date:	  	                                     
   
		  	[No more than 10 years]

 Pursuant to the AlloVir, Inc. 2020 Stock Option and Grant Plan (the “Plan”), AlloVir, Inc. (the
“Company”) hereby grants to the Optionee named above, who is a Non-Employee Director of the Company, an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified
above all or part of the number of shares of Common Stock, par value $0.0001 per share (the “Stock”), of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth
herein and in the Plan. This Stock Option is not intended to be an “incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended. 

1.    Exercisability Schedule. No portion of this Stock Option may be exercised until such portion shall have
become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to
the following number of Option Shares on the dates indicated so long as the Optionee remains in service as a member of the Board on such dates: 
  

			
	 Incremental Number of
Option Shares
Exercisable
	  	 Exercisability Date

	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        

 [Notwithstanding the foregoing, in the event of a Sale Event, 100% of the then-outstanding
and unvested Option Shares shall immediately be deemed vested and exercisable on the date of such Sale Event; provided, that the Optionee remains in service as a member of the Board until the date of such Sale Event]. Once exercisable, this Stock
Option shall continue to be exercisable at any time or times prior to the close of business on the Expiration Date, subject to the provisions hereof and of the Plan. 

2.    Manner of Exercise. 

(a)    The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the
Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of
Option Shares to be purchased. 
 Payment of the purchase price for the Option Shares may be made by one or more of the following methods:
(i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that
are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; (iii) by the Optionee delivering to the Company a
properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee
chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such
payment procedure; (iv) by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed
the aggregate exercise price; or (v) a combination of (i), (ii), (iii) and (iv) above. Payment instruments will be received subject to collection. 

The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the
Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and
(iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent
resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock
transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to. 

  
 2 

 (b)    The shares of Stock purchased upon exercise of this Stock Option
shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable laws or regulations in connection with such transfer and with
the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be the holder of, or to have any of the rights of a holder with
respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent shall have transferred the shares to the Optionee, and the
Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights with respect to such shares of Stock. 

(c)    The minimum number of shares with respect to which this Stock Option may be exercised at any one time shall be 100
shares, unless the number of shares with respect to which this Stock Option is being exercised is the total number of shares subject to exercise under this Stock Option at the time. 

(d)    Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable
after the Expiration Date hereof. 
 3.    Termination as Non-Employee
Director. If the Optionee ceases to be a Non-Employee Director of the Company, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below. 

(a)    Termination Due to Death. If the Optionee’s service as a
Non-Employee Director terminates by reason of the Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised
by the Optionee’s legal representative or legatee for a period of 12 months from the date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate
immediately and be of no further force or effect. 
 (b)    Other Termination. If the Optionee ceases to be a Non-Employee Director for any reason other than the Optionee’s death, any portion of this Stock Option outstanding on such date may be exercised, to the extent exercisable on the date the Optionee ceased to be
a Non-Employee Director, for a period of six months from the date the Optionee ceased be a Non-Employee Director or until the Expiration Date, if earlier. Any portion of
this Stock Option that is not exercisable on the date the Optionee ceases to be a Non-Employee Director shall terminate immediately and be of no further force or effect. 

4.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 5.    Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s
lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee. 

  
 3 

 6.    No Obligation to Continue as a
Non-Employee Director. Neither the Plan nor this Stock Option confers upon the Optionee any rights with respect to continuance as a Non-Employee Director. 

7.    Integration. This Agreement constitutes the entire agreement between the parties with respect to this Stock
Option and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

8.    Tax Withholding.    The Optionee shall, not later than the date as of which the receipt
of this Award becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any Federal, state, and local taxes required by law to be withheld on account of such
taxable event. The Company shall have the authority to cause the required tax withholding obligation to be satisfied, in whole or in part, by (i) withholding from shares of Stock to be issued to the Optionee a number of shares of Stock with an
aggregate Fair Market Value that would satisfy the withholding amount due; or (ii) causing its transfer agent to sell from the number of shares of Stock to be issued to the Optionee, the number of shares of Stock necessary to satisfy the
Federal, state and local taxes required by law to be withheld from the Optionee on account of such transfer. 

9.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future
equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the Relevant
Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider
appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

10.    Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business
and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing. 

11.    Waivers. The Optionee acknowledges that a waiver by the Company of breach of any provision of this Agreement
shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Optionee or any other Optionee. 

  
 4 

 12.    Severability. The provisions of this Agreement are
severable and if any one or more provisions are determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable. 

13.    Electronic Delivery and Acceptance of Documents. The Company may, in its sole discretion, decide to deliver
any documents related to current or future participation in the Plan by electronic means. The Optionee hereby consents to receive such documents by electronic delivery and agree to participate in the Plan through an
on-line or electronic system established and maintained by the Company or a third party designated by the Company. 
  

			
	AlloVir, Inc.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable. 

 

			
	 Dated:
	 	
 

			
		 	

	
	  

Optionee’s Signature

	
	Optionee’s name and address:
	  

	  

	  

 
 

  
 5 

 NON-QUALIFIED STOCK OPTION AGREEMENT 

FOR COMPANY EMPLOYEES 

UNDER THE ALLOVIR, INC. 

2020 STOCK OPTION AND GRANT PLAN 
  

			
	Name of Optionee:	  	                                     
                                         
  
		
	No. of Option Shares:	  	                                     
   
		
	Option Exercise Price per Share:	  	$                                     
 
		  	[FMV on Grant Date]
		
	Grant Date:	  	                                     
   
		
	Expiration Date:	  	                                     
   
		  	[No more than 10 years]

 Pursuant to the AlloVir, Inc. 2020 Stock Option and Grant Plan as amended through the date hereof (the
“Plan”), AlloVir, Inc. (the “Company”) hereby grants to the Optionee named above an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the number of shares of
Common Stock, par value $0.0001 per share (the “Stock”) of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan. This Stock Option is not
intended to be an “incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended. 

1.    Exercisability Schedule. No portion of this Stock Option may be exercised until such portion shall have
become exercisable. Except as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to
the following number of Option Shares on the dates indicated so long as Optionee continues to have a [Service Relationship] with the Company or a Subsidiary on such dates: 
  

			
	 Incremental Number of
Option Shares
Exercisable
	  	 Exercisability Date

	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        

 Once exercisable, this Stock Option shall continue to be exercisable at any time or times
prior to the close of business on the Expiration Date, subject to the provisions hereof and of the Plan. 

2.    Manner of Exercise. 

(a)    The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the
Expiration Date of this Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of
Option Shares to be purchased. 
 Payment of the purchase price for the Option Shares may be made by one or more of the following methods:
(i) in cash, by certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that
are beneficially owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; (iii) by the Optionee delivering to the Company a
properly executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee
chooses to pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such
payment procedure; (iv) by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Stock issuable upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed
the aggregate exercise price; or (v) a combination of (i), (ii), (iii) and (iv) above. Payment instruments will be received subject to collection. 

The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the
Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and
(iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent
resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock
transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to. 
 (b)    The
shares of Stock purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable
laws or regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be
the holder of, or to have any of the rights of a holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent
shall have transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights
with respect to such shares of Stock. 

  
 2 

 (c)    The minimum number of shares with respect to which this Stock
Option may be exercised at any one time shall be 100 shares, unless the number of shares with respect to which this Stock Option is being exercised is the total number of shares subject to exercise under this Stock Option at the time. 

(d)    Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable
after the Expiration Date hereof. 
 3.    Termination of Service Relationship. If the Optionee’s Service
Relationship with the Company or a Subsidiary (as defined in the Plan) is terminated, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below. 

(a)    Termination Due to Death. If the Optionee’s Service Relationship with the Company or a Subsidiary
terminates by reason of the Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised by the Optionee’s legal representative or legatee for a
period of 12 months from the date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate immediately and be of no further force or effect. 

(b)    Termination Due to Disability. If the Optionee’s Service Relationship with the Company or a Subsidiary
terminates by reason of the Optionee’s disability (as determined by the Administrator), any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of such termination, may thereafter be exercised by the
Optionee for a period of 12 months from the date of disability or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of disability shall terminate immediately and be of no further force or
effect. 
 (c)    Termination for Cause. If the Optionee’s Service Relationship with the Company or a
Subsidiary terminates for Cause, any portion of this Stock Option outstanding on such date shall terminate immediately and be of no further force and effect. 

(d)    Other Termination. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates
for any reason other than the Optionee’s death, the Optionee’s disability or Cause, and unless otherwise determined by the Administrator, any portion of this Stock Option outstanding on such date may be exercised, to the extent exercisable
on the date of termination, for a period of three months from the date of termination or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of termination shall terminate immediately and be of
no further force or effect. 

  
 3 

 The Administrator’s determination of the reason for termination of the Optionee’s
Service Relationship with the Company or a Subsidiary shall be conclusive and binding on the Optionee and his or her representatives or legatees. 

4.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 5.    Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s
lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal representative or legatee. 

6.    Responsibility for Taxes. 

(a)    The Optionee acknowledges that, regardless of any action taken by the Company or, if different, the Subsidiary
employing the Optionee (the “Employer”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related items related to the
Optionee’s participation in the Plan and legally applicable to the Optionee (“Tax-Related Items”) is and remains the Optionee’s responsibility and may exceed the amount, if any, actually
withheld by the Company or the Employer. The Optionee further acknowledges that the Company and/or the Employer (i) make no representations or undertakings regarding the treatment of any Tax-Related Items
in connection with any aspect of this Stock Option, including, but not limited to, the grant, vesting or exercise of this Stock Option, the subsequent sale of shares of Stock acquired pursuant to such exercise and the receipt of any dividends; and
(ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of this Stock Option to reduce or eliminate the Optionee’s liability for Tax-Related Items or
achieve any particular tax result. Further, if the Optionee is subject to Tax-Related Items in more than one jurisdiction, the Optionee acknowledges that the Company and/or the Employer (or former employer, as
applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction. 

(b)    Prior to any relevant taxable or tax withholding event, as applicable, the Optionee agrees to make adequate
arrangements satisfactory to the Company and/or the Employer to satisfy all Tax-Related Items. In this regard, the Optionee authorizes the Company and/or the Employer, or their respective agents, at their
discretion, to satisfy any applicable withholding obligations with regard to all Tax-Related Items by one or a combination of the following: (i) withholding from the Optionee’s wages or other cash
compensation paid to the Optionee by the Company and/or the Employer; (ii) allowing or requiring the Optionee to make a cash payment to cover the Tax-Related Items; (iii) withholding from proceeds of
the sale of shares of Stock acquired upon exercise of this Stock Option either through a voluntary sale or through a mandatory sale arranged by the Company (on the Optionee’s behalf pursuant to this authorization without further consent); (iv)
withholding from the shares of Stock to be issued to the Optionee upon exercise of this Stock Option; or (v) any other method of withholding determined by the Company and permitted by
applicable law; provided, however, that if the Optionee is a Section 16 officer of the Company under the Exchange Act, in which case, the obligation for Tax-Related Items may be satisfied only by one or a
combination of methods (i), (ii) and (iii) above. 

  
 4 

 (c)    Depending on the withholding method, the Company and/or the
Employer may withhold or account for Tax-Related Items by considering applicable statutory withholding amounts or other applicable withholding rates, including maximum rates applicable in the Optionee’s
jurisdiction, in which case the Optionee may receive a refund of any over-withheld amount in cash and will have no entitlement to the equivalent amount in shares of Stock. If the obligation for Tax-Related
Items is satisfied by withholding in shares of Stock, for tax purposes, the Optionee is deemed to have been issued the full number of shares of Stock subject to the exercised Stock Option, notwithstanding that a number of the shares of Stock is held
back solely for the purpose of paying the Tax-Related Items. 
 (d)    The
Optionee agrees to pay to the Company or the Employer any amount of Tax-Related Items that the Company or the Employer may be required to withhold or account for as a result of the Optionee’s
participation in the Plan that cannot be satisfied by the means previously described. The Company may refuse to issue or deliver the shares of Stock, or the proceeds of the sale of shares of Stock, if the Optionee fails to comply with his or her
obligations in connection with the Tax-Related Items. 
 7.    No Obligation
to Continue Service Relationship. Neither the Company nor any Subsidiary is obligated by or as a result of the Plan or this Agreement to continue the Optionee in a Service Relationship with the Company or a Subsidiary and neither the Plan nor
this Agreement shall interfere in any way with the right of the Company or any Subsidiary to terminate the Optionee’s Service Relationship with the Company or a Subsidiary at any time. 

8.    Integration. This Agreement constitutes the entire agreement between the parties with respect to this Stock
Option and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

9.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure future
equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the Relevant
Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider
appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

  
 5 

 10.    Notices. Notices hereunder shall be mailed or delivered to the
Company at its principal place of business and shall be mailed or delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing. 

11.    Waivers. The Optionee acknowledges that a waiver by the Company of breach of any provision of this Agreement
shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Optionee or any other Optionee. 

12.    Severability. The provisions of this Agreement are severable and if any one or more provisions are
determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable. 

13.    Electronic Delivery and Acceptance of Documents. The Company may, in its sole discretion, decide to deliver
any documents related to current or future participation in the Plan by electronic means. The Optionee hereby consents to receive such documents by electronic delivery and agree to participate in the Plan through an
on-line or electronic system established and maintained by the Company or a third party designated by the Company. 
  

			
	AlloVir, Inc.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable. 

 

			
	Dated:	 	  

	
	  

Optionee’s Signature

	
	Optionee’s name and address:
	  

	  

	  

 
 

  
 6 

 RESTRICTED STOCK AWARD AGREEMENT 

UNDER THE ALLOVIR, INC. 

2020 STOCK OPTION AND GRANT PLAN 
  

			
	Name of Grantee:	  	                                     
                                         
  
		
	No. of Option Shares:	  	                                     
   
		
	Grant Date:	  	                                     
   

 Pursuant to the AlloVir, Inc. 2020 Stock Option and Grant Plan (the “Plan”), AlloVir, Inc. (the
“Company”) hereby grants a Restricted Stock Award (an “Award”) to the Grantee named above. Upon acceptance of this Award, the Grantee shall receive the number of shares of Common Stock, par value $0.0001 per share (the
“Stock”) of the Company specified above, subject to the restrictions and conditions set forth herein and in the Plan. The Company acknowledges the receipt from the Grantee of consideration with respect to the par value of the Stock in the
form of cash, past or future services rendered to the Company by the Grantee or such other form of consideration as is acceptable to the Administrator. 

1.    Award. The shares of Restricted Stock awarded hereunder shall be issued and held by the Company’s
transfer agent in book entry form, and the Grantee’s name shall be entered as the stockholder of record on the books of the Company. Thereupon, the Grantee shall have all the rights of a stockholder with respect to such shares, including voting
and dividend rights, subject, however, to the restrictions and conditions specified in Paragraph 2 below. The Grantee shall (i) sign and deliver to the Company a copy of this Award Agreement and (ii) deliver to the Company a
stock power endorsed in blank. 
 2.    Restrictions and Conditions. 

(a)    Any book entries for the shares of Restricted Stock granted herein shall bear an appropriate legend, as determined
by the Administrator in its sole discretion, to the effect that such shares are subject to restrictions as set forth herein and in the Plan. 

(b)    Shares of Restricted Stock granted herein may not be sold, assigned, transferred, pledged or otherwise encumbered
or disposed of by the Grantee prior to vesting. 
 (c)    If the Grantee’s Service Relationship with the Company or
a Subsidiary is voluntarily or involuntarily terminated for any reason (including death) prior to vesting of shares of Restricted Stock granted herein, all shares of Restricted Stock shall immediately and automatically be forfeited and returned to
the Company. 
 3.    Vesting of Restricted Stock. The restrictions and conditions in Paragraph 2 of this
Agreement shall lapse on the Vesting Date or Dates specified in the following schedule so long as the Grantee continues to have a [Service Relationship] with the Company or a Subsidiary on 

 
such Dates. If a series of Vesting Dates is specified, then the restrictions and conditions in Paragraph 2 shall lapse only with respect to the number of shares of Restricted Stock specified
as vested on such date. 
  

			
	 Incremental Number of
Shares
Vested
	  	 Vesting Date

	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        

 Subsequent to such Vesting Date or Dates, the shares of Stock on which all restrictions and conditions have
lapsed shall no longer be deemed Restricted Stock. The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 3. 

4.    Dividends. Dividends on shares of Restricted Stock shall be paid currently to the Grantee. 

5.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Award shall be subject to and
governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning
is specified herein. 
 6.    Transferability. This Agreement is personal to the Grantee, is non-assignable and is not transferable in any manner, by operation of law or otherwise, other than by will or the laws of descent and distribution. 

7.    Responsibility for Taxes.  

(a)    The Grantee acknowledges that, regardless of any action taken by the Company or, if different, the Subsidiary
employing the Grantee (the “Employer”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related items related to the
Grantee’s participation in the Plan and legally applicable to the Grantee (“Tax-Related Items”) is and remains the Grantee’s responsibility and may exceed the amount, if any, actually
withheld by the Company or the Employer. The Grantee further acknowledges that the Company and/or the Employer (i) make no representations or undertakings regarding the treatment of any Tax-Related Items
in connection with any aspect of the Restricted Stock, the subsequent sale of shares of Stock and the receipt of any dividends; and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the
Restricted Stock to reduce or eliminate the Grantee’s liability for Tax-Related Items or achieve any particular tax result. Further, if the Grantee is subject to
Tax-Related Items in more than one jurisdiction, the Grantee acknowledges that the Company and/or the Employer (or former employer, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction. 

  
 2 

 (b)    Prior to any relevant taxable or tax withholding event, as
applicable, the Grantee agrees to make adequate arrangements satisfactory to the Company and/or the Employer to satisfy all Tax-Related Items. In this regard, the Grantee authorizes the Company and/or the
Employer, or their respective agents, at their discretion, to satisfy any applicable withholding obligations with regard to all Tax-Related Items by one or a combination of the following: (i) withholding
from the Grantee’s wages or other cash compensation paid to the Grantee by the Company and/or the Employer; (ii) withholding from proceeds of the sale of shares of vested Restricted Stock either through a voluntary sale or through a
mandatory sale arranged by the Company (on the Grantee’s behalf pursuant to this authorization without further consent); (iii) withholding from shares of Stock to be issued or released by the transfer agent to the Grantee; or (iv) any
other method of withholding determined by the Company and permitted by applicable law; provided, however, that if the Grantee is a Section 16 officer of the Company under the Exchange Act, then the Administrator shall establish the
method of withholding from alternatives (i)-(iv) herein and, if the Administrator does not exercise its discretion prior to the applicable withholding event, then the Grantee shall be entitled to elect the method of withholding from the alternatives
above. 
 (c)    The Company and/or the Employer may withhold or account for
Tax-Related Items by considering applicable statutory withholding amounts or other applicable withholding rates, including maximum rates applicable in the Grantee’s jurisdiction, in which case the Grantee
may receive a refund of any over-withheld amount in cash and will have no entitlement to the equivalent amount in shares of Stock, for tax purposes, the Grantee is deemed to have been issued the full number of shares of Stock, notwithstanding that a
number of the shares of Stock is held back solely for the purpose of paying the Tax-Related Items. 

(d)    The Grantee agrees to pay to the Company or the Employer any amount of
Tax-Related Items that the Company or the Employer may be required to withhold or account for as a result of the Grantee’s participation in the Plan that cannot be satisfied by the means previously
described. The Company may refuse to issue, deliver or release the shares of Stock, or the proceeds of the sale of shares of Stock, if the Grantee fails to comply with his or her obligations in connection with the
Tax-Related Items. 
 8.    Election Under Section 83(b). The
Grantee and the Company hereby agree that the Grantee may, within 30 days following the Grant Date of this Award, file with the Internal Revenue Service and the Company an election under Section 83(b) of the Internal Revenue Code. In the event
the Grantee makes such an election, he or she agrees to provide a copy of the election to the Company. The Grantee acknowledges that he or she is responsible for obtaining the advice of his or her tax advisors with regard to the Section 83(b)
election and that he or she is relying solely on such advisors and not on any statements or representations of the Company or any of its agents with regard to such election. 

9.    No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is obligated by or as
a result of the Plan or this Agreement to continue the Grantee in a Service Relationship with the Company or a Subsidiary and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any Subsidiary to terminate
the Grantee’s Service Relationship with the Company or a Subsidiary at any time. 

  
 3 

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

11.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure
future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Grantee may have with respect to the Relevant Information;
(iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider
appropriate. The Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

12.    Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business
and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing. 

13.    Waivers. The Grantee acknowledges that a waiver by the Company of breach of any provision of this Agreement
shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Grantee or any other Grantee. 

  
 4 

 14.    Severability. The provisions of this Agreement are
severable and if any one or more provisions are determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable. 

15.    Electronic Delivery and Acceptance of Documents. The Company may, in its sole discretion, decide to deliver
any documents related to current or future participation in the Plan by electronic means. The Grantee hereby consents to receive such documents by electronic delivery and agree to participate in the Plan through an
on-line or electronic system established and maintained by the Company or a third party designated by the Company. 
  

			
	AlloVir, Inc.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable. 

 

			
	 Dated:
	 	
 

	
	  

Grantee’s Signature

	
	Grantee’s name and address:
	  

	  

	  

 
 

  
 5 

 RESTRICTED STOCK UNIT AWARD AGREEMENT 

FOR CONSULTANTS 
 UNDER
THE ALLOVIR, INC. 
 2020 STOCK OPTION AND GRANT PLAN 
  

			
	Name of Grantee:	  	                                     
                                         
  
		
	No. of Restricted Stock Units:	  	                                     
   
		
	Grant Date:	  	                                     
   

 Pursuant to the AlloVir, Inc. 2020 Stock Option and Grant Plan (the “Plan”), AlloVir, Inc. (the
“Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate to one share of Class A Common Stock, par value $0.0001
per share (the “Stock”) of the Company. 
 1.    Restrictions on Transfer of Award. This Award may not
be sold, transferred, pledged, assigned or otherwise encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until
(i) the Restricted Stock Units have vested as provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement. 

2.    Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement
shall lapse on the Vesting Date or Dates specified in the following schedule so long as the Grantee continues to have a Service Relationship with the Company or a Subsidiary on such Dates. If a series of Vesting Dates is specified, then the
restrictions and conditions in Paragraph 1 shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date. 
  

			
	 Incremental Number of
Restricted Stock
Units Vested
	  	 Vesting Date

	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        

 The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 2. 

3.    Termination of Service Relationship. If the Grantee’s Service Relationship with the Company or a
Subsidiary terminates for any reason (including death or disability) prior to the satisfaction of the vesting conditions set forth in Paragraph 2 above, any Restricted Stock Units that have not vested as of such date shall automatically and without
notice terminate and be forfeited, and neither the Grantee nor any of his or her successors, heirs, assigns, or personal representatives will thereafter have any further rights or interests in such unvested Restricted Stock Units. 

 4.    Issuance of Shares of Stock. As soon as practicable
following each Vesting Date (but in no event later than two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock
equal to the aggregate number of Restricted Stock Units that have vested pursuant to Paragraph 2 of this Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares. 

5.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 6.    Responsibility for Taxes. 

(a)    The Grantee acknowledges that, regardless of any action taken by the Company or, if different, the Subsidiary for
which the Grantee provides services (the “Service Recipient”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related
items related to the Grantee’s participation in the Plan and legally applicable to the Grantee (“Tax-Related Items”) is and remains the Grantee’s responsibility and may exceed the amount,
if any, actually withheld by the Company or the Service Recipient. The Grantee further acknowledges that the Company and/or the Service Recipient (i) make no representations or undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of the Restricted Stock Units, the subsequent sale of shares of Stock acquired pursuant to such settlement and the receipt of any dividends; and (ii) do not
commit to and are under no obligation to structure the terms of the grant or any aspect of the Restricted Stock Units to reduce or eliminate the Grantee’s liability for Tax-Related Items or achieve any
particular tax result. Further, if the Grantee is subject to Tax-Related Items in more than one jurisdiction, the Grantee acknowledges that the Company and/or the Service Recipient (or former service
recipient, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction. 

(b)    Prior to any relevant taxable or tax withholding event, as applicable, the Grantee agrees to make adequate
arrangements satisfactory to the Company and/or the Service Recipient to satisfy all Tax-Related Items. In this regard, the Grantee authorizes the Company and/or the Service Recipient, or their respective
agents, at their discretion, to satisfy any applicable withholding obligations with regard to all Tax-Related Items by one or a combination of the following: (i) withholding from the Grantee’s wages
or other cash compensation paid to the Grantee by the Company and/or the Service Recipient; (ii) withholding from proceeds of the sale of shares of Stock upon settlement of the Restricted Stock Units either through a voluntary sale or through a
mandatory sale arranged by the Company (on the Grantee’s behalf pursuant to this authorization without further consent); (iii) withholding from shares of Stock to be issued to the Grantee upon settlement of the Restricted Stock Units; or
(iv) any other method of withholding determined by the Company and permitted by applicable law; provided, however, that if the Grantee is a Section 16 officer of the Company under the Exchange Act, then the Administrator shall
establish the method of withholding from alternatives (i)-(iv) herein and, if the Administrator does not exercise its discretion prior to the applicable withholding event, then the Grantee shall be entitled to elect the method of withholding from
the alternatives above. 

  
 2 

 (c)    The Company and/or the Service Recipient may withhold or account
for Tax-Related Items by considering applicable statutory withholding amounts or other applicable withholding rates, including maximum rates applicable in the Grantee’s jurisdiction, in which case the
Grantee may receive a refund of any over-withheld amount in cash and will have no entitlement to the equivalent amount in shares of Stock, for tax purposes, the Grantee is deemed to have been issued the full number of shares of Stock subject to the
vested Restricted Stock Units, notwithstanding that a number of the shares of Stock is held back solely for the purpose of paying the Tax-Related Items. 

(d)    The Grantee agrees to pay to the Company or the Service Recipient any amount of
Tax-Related Items that the Company or the Service Recipient may be required to withhold or account for as a result of the Grantee’s participation in the Plan that cannot be satisfied by the means
previously described. The Company may refuse to issue or deliver the shares of Stock, or the proceeds of the sale of shares of Stock, if the Grantee fails to comply with his or her obligations in connection with the
Tax-Related Items. 
 7.    Section 409A of the Code. This Agreement
shall be interpreted in such a manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A of the Code.

 8.    No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is obligated by
or as a result of the Plan or this Agreement to continue the Grantee in a Service Relationship with the Company or a Subsidiary and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any Subsidiary to
terminate the Service Relationship of the Grantee at any time. 
 9.    Integration. This Agreement constitutes
the entire agreement between the parties with respect to this Award and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

10.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure
future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Grantee may have with respect to the Relevant Information;
(iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The
Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

  
 3 

 11.    Notices. Notices hereunder shall be mailed or delivered to
the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

 12.    Waivers. The Grantee acknowledges that a waiver by the Company of breach of any provision of this
Agreement shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Grantee or any other Grantee. 

13.    Severability. The provisions of this Agreement are severable and if any one or more provisions are
determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable. 

13.    Electronic Delivery and Acceptance of Documents. The Company may, in its sole discretion, decide to deliver
any documents related to current or future participation in the Plan by electronic means. The Grantee hereby consents to receive such documents by electronic delivery and agree to participate in the Plan through an
on-line or electronic system established and maintained by the Company or a third party designated by the Company. 
  

			
	AlloVir, Inc.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable. 

 

			
	 Dated:
	 	
 

	
	  

Grantee’s Signature

	
	Grantee’s name and address:
	  

	  

	  

 
 

  
 4 

 RESTRICTED STOCK UNIT AWARD AGREEMENT 

FOR NON-EMPLOYEE DIRECTORS 

UNDER THE ALLOVIR, INC. 

2020 STOCK OPTION AND GRANT PLAN 
  

			
	Name of Grantee:	  	                                     
                                         
  
		
	No. of Restricted Stock Units:	  	                                     
   
		
	Grant Date:	  	                                     
   

 Pursuant to the AlloVir, Inc. 2020 Stock Option and Incentive Plan (the “Plan”), AlloVir, Inc. (the
“Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate to one share of Common Stock, par value $0.0001 per share
(the “Stock”) of the Company. 
 1.    Restrictions on Transfer of Award. This Award may not be sold,
transferred, pledged, assigned or otherwise encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until
(i) the Restricted Stock Units have vested as provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement. 

2.    Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement shall lapse
on the Vesting Date or Dates specified in the following schedule so long as the Grantee remains in service as a member of the Board on such Dates. If a series of Vesting Dates is specified, then the restrictions and conditions in Paragraph 1
shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date. 
  

			
	 Incremental Number of
Restricted Stock
Units Vested
	  	 Vesting Date

	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        

 [Notwithstanding the foregoing, in the event of a Sale Event, 100% of the then-outstanding and unvested
Restricted Stock Units shall immediately be deemed vested on the date of such Sale Event; provided, that the Grantee remains in service as a member of the Board until the date of such Sale Event. The Administrator may at any time accelerate the
vesting schedule specified in this Paragraph 2.] 

 3.    Termination of Service as a
Non-Employee Director. If the Grantee’s service with the Company and its Subsidiaries as a member of the Board terminates for any reason (including death or disability) prior to the satisfaction of
the vesting conditions set forth in Paragraph 2 above, any Restricted Stock Units that have not vested as of such date shall automatically and without notice terminate and be forfeited, and neither the Grantee nor any of his or her successors,
heirs, assigns, or personal representatives will thereafter have any further rights or interests in such unvested Restricted Stock Units. 

4.    Issuance of Shares of Stock. As soon as practicable following each Vesting Date (but in no event later than
two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock equal to the aggregate number of Restricted Stock Units
that have vested pursuant to Paragraph 2 of this Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares. 

5.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to
and governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different
meaning is specified herein. 
 6.    Section 409A of the Code. This Agreement shall be interpreted in such
a manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A OF THE CODE. 

7.    No Obligation to Continue as a Non-Employee Director. Neither the Plan nor
this Award confers upon the Grantee any rights with respect to continuance as a Non-Employee Director. 

8.    Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award
and supersedes all prior agreements and discussions between the parties concerning such subject matter. 
 9.    Tax
Withholding. The Grantee shall, not later than the date as of which the receipt of this Award becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Administrator for payment of any
Federal, state, and local taxes required by law to be withheld on account of such taxable event. The Company shall have the authority to cause the required tax withholding obligation to be satisfied, in whole or in part, by (i) withholding from
shares of Stock to be issued to the Grantee a number of shares of Stock with an aggregate Fair Market Value that would satisfy the withholding amount due; or (ii) causing its transfer agent to sell from the number of shares of Stock to be
issued to the Grantee, the number of shares of Stock necessary to satisfy the Federal, state and local taxes required by law to be withheld from the Grantee on account of such transfer. 

  
 2 

 (a)    The Grantee acknowledges that, regardless of any action taken by
the Company or, if different, the Subsidiary for which the Grantee provides services (the “Service Recipient”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related items related to the Grantee’s participation in the Plan and legally applicable to the Grantee (“Tax-Related Items”) is and remains the
Grantee’s responsibility and may exceed the amount, if any, actually withheld by the Company or the Service Recipient. The Grantee further acknowledges that the Company and/or the Service Recipient (i) make no representations or
undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of the Restricted Stock Units, the subsequent sale of shares of Stock acquired pursuant to such settlement and the
receipt of any dividends; and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the Restricted Stock Units to reduce or eliminate the Grantee’s liability for Tax-Related Items or achieve any particular tax result. Further, if the Grantee is subject to Tax-Related Items in more than one jurisdiction, the Grantee acknowledges that
the Company and/or the Service Recipient (or former service recipient, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction. 

(b)    Prior to any relevant taxable or tax withholding event, as applicable, the Grantee agrees to make adequate
arrangements satisfactory to the Company and/or the Service Recipient to satisfy all Tax-Related Items. In this regard, the Grantee authorizes the Company and/or the Service Recipient, or their respective
agents, at their discretion, to satisfy any applicable withholding obligations with regard to all Tax-Related Items by one or a combination of the following: (i) withholding from the Grantee’s wages
or other cash compensation paid to the Grantee by the Company and/or the Service Recipient; (ii) withholding from proceeds of the sale of shares of Stock upon settlement of the Restricted Stock Units either through a voluntary sale or through a
mandatory sale arranged by the Company (on the Grantee’s behalf pursuant to this authorization without further consent); (iii) withholding from shares of Stock to be issued to the Grantee upon settlement of the Restricted Stock Units; or
(iv) any other method of withholding determined by the Company and permitted by applicable law; provided, however, that if the Grantee is a Section 16 officer of the Company under the Exchange Act, then the Administrator shall
establish the method of withholding from alternatives (i)-(iv) herein and, if the Administrator does not exercise its discretion prior to the applicable withholding event, then the Grantee shall be entitled to elect the method of withholding from
the alternatives above. 
 (c)    The Company and/or the Service Recipient may withhold or account for Tax-Related Items by considering applicable statutory withholding amounts or other applicable withholding rates, including maximum rates applicable in the Grantee’s jurisdiction, in which case the Grantee may
receive a refund of any over-withheld amount in cash and will have no entitlement to the equivalent amount in shares of Stock, for tax purposes, the Grantee is deemed to have been issued the full number of shares of Stock subject to the vested
Restricted Stock Units, notwithstanding that a number of the shares of Stock is held back solely for the purpose of paying the Tax-Related Items. 

(d)    The Grantee agrees to pay to the Company or the Service Recipient any amount of
Tax-Related Items that the Company or the Service Recipient may be required to withhold or account for as a result of the Grantee’s participation in the Plan that cannot be satisfied by the means
previously described. The Company may refuse to issue or deliver the shares of Stock, or the proceeds of the sale of shares of Stock, if the Grantee fails to comply with his or her obligations in connection with the
Tax-Related Items. 

  
 3 

 10.    Data Privacy Consent. In order to administer the Plan and
this Agreement and to implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data,
including but not limited to Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the
“Relevant Information”). By entering into this Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the
Grantee may have with respect to the Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction
in which the Relevant Companies consider appropriate. The Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

11.    Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business
and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing. 

12.    Waivers. The Grantee acknowledges that a waiver by the Company of breach of any provision of this Agreement
shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Grantee or any other Grantee. 

13.    Severability. The provisions of this Agreement are severable and if any one or more provisions are
determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable. 

14.    Electronic Delivery and Acceptance of Documents. The Company may, in its sole discretion, decide to deliver
any documents related to current or future participation in the Plan by electronic means. The Grantee hereby consents to receive such documents by electronic delivery and agree to participate in the Plan through an
on-line or electronic system established and maintained by the Company or a third party designated by the Company. 

  
 4 

 
			
	AlloVir, Inc.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable. 

 

			
	 Dated:
	 	
 

	
	  

Grantee’s Signature

	
	Grantee’s name and address:
	  

	  

	  

 
 

  
 5 

 RESTRICTED STOCK UNIT AWARD AGREEMENT 

FOR COMPANY EMPLOYEES 

UNDER THE ALLOVIR, INC. 

2020 STOCK OPTION AND GRANT PLAN 
  

			
	Name of Grantee:	  	                                     
                                         
  
		
	No. of Restricted Stock Units:	  	                                     
   
		
	Grant Date:	  	                                     
   

 Pursuant to the AlloVir, Inc. 2020 Stock Option and Grant Plan (the “Plan”), AlloVir, Inc. (the
“Company”) hereby grants an award of the number of Restricted Stock Units listed above (an “Award”) to the Grantee named above. Each Restricted Stock Unit shall relate to one share of Common Stock, par value $0.0001 per share
(the “Stock”) of the Company. 
 1.    Restrictions on Transfer of Award. This Award may not be sold,
transferred, pledged, assigned or otherwise encumbered or disposed of by the Grantee, and any shares of Stock issuable with respect to the Award may not be sold, transferred, pledged, assigned or otherwise encumbered or disposed of until
(i) the Restricted Stock Units have vested as provided in Paragraph 2 of this Agreement and (ii) shares of Stock have been issued to the Grantee in accordance with the terms of the Plan and this Agreement. 

2.    Vesting of Restricted Stock Units. The restrictions and conditions of Paragraph 1 of this Agreement
shall lapse on the Vesting Date or Dates specified in the following schedule so long as the Grantee continues to have a [Service Relationship] with the Company or a Subsidiary on such Dates. If a series of Vesting Dates is specified, then the
restrictions and conditions in Paragraph 1 shall lapse only with respect to the number of Restricted Stock Units specified as vested on such date. 
  

			
	 Incremental Number of
Restricted Stock
Units Vested
	  	 Vesting Date

	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        
	
                
         (    %)
	  	                        

 The Administrator may at any time accelerate the vesting schedule specified in this Paragraph 2. 

3.    Termination of Service Relationship. If the Grantee’s Service Relationship with the Company or a
Subsidiary terminates for any reason (including death or disability) prior to the satisfaction of the vesting conditions set forth in Paragraph 2 above, any Restricted Stock Units 

 
that have not vested as of such date shall automatically and without notice terminate and be forfeited, and neither the Grantee nor any of his or her successors, heirs, assigns, or personal
representatives will thereafter have any further rights or interests in such unvested Restricted Stock Units. 

4.    Issuance of Shares of Stock. As soon as practicable following each Vesting Date (but in no event later than
two and one-half months after the end of the year in which the Vesting Date occurs), the Company shall issue to the Grantee the number of shares of Stock equal to the aggregate number of Restricted Stock Units
that have vested pursuant to Paragraph 2 of this Agreement on such date and the Grantee shall thereafter have all the rights of a stockholder of the Company with respect to such shares. 

5.    Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to and
governed by all the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning
is specified herein. 
 6.    Responsibility for Taxes. 

(a)    The Grantee acknowledges that, regardless of any action taken by the Company or, if different, the Subsidiary
employing the Grantee (the “Employer”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related items related to the
Grantee’s participation in the Plan and legally applicable to the Grantee (“Tax-Related Items”) is and remains the Grantee’s responsibility and may exceed the amount, if any, actually
withheld by the Company or the Employer. The Grantee further acknowledges that the Company and/or the Employer (i) make no representations or undertakings regarding the treatment of any Tax-Related Items
in connection with any aspect of the Restricted Stock Units, the subsequent sale of shares of Stock acquired pursuant to such settlement and the receipt of any dividends; and (ii) do not commit to and are under no obligation to structure the
terms of the grant or any aspect of the Restricted Stock Units to reduce or eliminate the Grantee’s liability for Tax-Related Items or achieve any particular tax result. Further, if the Grantee is subject
to Tax-Related Items in more than one jurisdiction, the Grantee acknowledges that the Company and/or the Employer (or former employer, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction. 
 (b)    Prior to any relevant
taxable or tax withholding event, as applicable, the Grantee agrees to make adequate arrangements satisfactory to the Company and/or the Employer to satisfy all Tax-Related Items. In this regard, the Grantee
authorizes the Company and/or the Employer, or their respective agents, at their discretion, to satisfy any applicable withholding obligations with regard to all Tax-Related Items by one or a combination of
the following: (i) withholding from the Grantee’s wages or other cash compensation paid to the Grantee by the Company and/or the Employer; (ii) withholding from proceeds of the sale of shares of Stock upon settlement of the Restricted
Stock Units either through a voluntary sale or through a mandatory sale arranged by the Company (on the Grantee’s behalf pursuant to this authorization without further consent); (iii) withholding from shares of Stock to be issued to the Grantee
upon settlement of the Restricted Stock Units; or (iv) any other method of withholding determined by the Company and permitted by applicable law; provided, however, that if the Grantee is a Section 16 officer of the Company under the
Exchange Act, then the Administrator shall establish the method of withholding from alternatives (i)-(iv) herein and, if the Administrator does not exercise its discretion prior to the applicable withholding event, then the Grantee shall be
entitled to elect the method of withholding from the alternatives above. 

  
 2 

 (c)    The Company and/or the Employer may withhold or account for Tax-Related Items by considering applicable statutory withholding amounts or other applicable withholding rates, including maximum rates applicable in the Grantee’s jurisdiction, in which case the Grantee may
receive a refund of any over-withheld amount in cash and will have no entitlement to the equivalent amount in shares of Stock, for tax purposes, the Grantee is deemed to have been issued the full number of shares of Stock subject to the vested
Restricted Stock Units, notwithstanding that a number of the shares of Stock is held back solely for the purpose of paying the Tax-Related Items. 

(d)    The Grantee agrees to pay to the Company or the Employer any amount of
Tax-Related Items that the Company or the Employer may be required to withhold or account for as a result of the Grantee’s participation in the Plan that cannot be satisfied by the means previously
described. The Company may refuse to issue or deliver the shares of Stock, or the proceeds of the sale of shares of Stock, if the Grantee fails to comply with his or her obligations in connection with the
Tax-Related Items. 
 7.    Section 409A of the Code. This Agreement
shall be interpreted in such a manner that all provisions relating to the settlement of the Award are exempt from the requirements of Section 409A of the Code as “short-term deferrals” as described in Section 409A of the
Code. 
 8.    No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is
obligated by or as a result of the Plan or this Agreement to continue the Grantee’s Service Relationship with the Company or a Subsidiary and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any
Subsidiary to terminate the Grantee’s Service Relationship with the Company or a Subsidiary at any time. 

9.    Integration. This Agreement constitutes the entire agreement between the parties with respect to this Award
and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

10.    Data Privacy Consent. In order to administer the Plan and this Agreement and to implement or structure
future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to Social Security or other
identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By entering into this
Agreement, the Grantee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Grantee may have with respect to the Relevant Information;
(iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies consider appropriate. The
Grantee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

  
 3 

 11.    Notices. Notices hereunder shall be mailed or delivered to
the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

 12.    Waivers. The Grantee acknowledges that a waiver by the Company of breach of any provision of this
Agreement shall not operate or be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Grantee or any other Grantee. 

13.    Severability. The provisions of this Agreement are severable and if any one or more provisions are
determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and enforceable. 

14.    Electronic Delivery and Acceptance of Documents. The Company may, in its sole discretion, decide to deliver
any documents related to current or future participation in the Plan by electronic means. The Grantee hereby consents to receive such documents by electronic delivery and agree to participate in the Plan through an
on-line or electronic system established and maintained by the Company or a third party designated by the Company. 
  

			
	AlloVir, Inc.
		
	By:	 	  

		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Grantee (including through an online acceptance process) is acceptable. 

 

			
	 Dated:
	 	
 

	
	  

Grantee’s Signature

	
	Grantee’s name and address:
	  

	  

	  

 
 

  
 4 

 INCENTIVE STOCK OPTION AGREEMENT 

UNDER THE ALLOVIR, INC. 

2020 STOCK OPTION AND GRANT PLAN 
  

							
	Name of Optionee:	 	 	 	 	  	
				
	No. of Option Shares:	 	 	 		  	
				
	Option Exercise Price per Share:	 	$                                      
            	 		  	
		 	[FMV on Grant Date (110% of FMV if a 10% owner)]
				
	Grant Date:	 	 	 		  	
				
	Expiration Date:	 	 	 		  	
		 	[up to 10 years (5 if a 10% owner)]	  	

 Pursuant to the AlloVir, Inc. 2020 Stock Option and Grant Plan (the “Plan”), AlloVir, Inc. (the
“Company”) hereby grants to the Optionee named above an option (the “Stock Option”) to purchase on or prior to the Expiration Date specified above all or part of the number of shares of Common Stock, par value $0.0001 per share
(the “Stock”), of the Company specified above at the Option Exercise Price per Share specified above subject to the terms and conditions set forth herein and in the Plan. 

1. Exercisability Schedule. No portion of this Stock Option may be exercised until such portion shall have become exercisable. Except
as set forth below, and subject to the discretion of the Administrator (as defined in Section 2 of the Plan) to accelerate the exercisability schedule hereunder, this Stock Option shall be exercisable with respect to the following number of
Option Shares on the dates indicated so long as the Optionee continues to have a Service Relationship with the Company or a Subsidiary on such dates: 
  

			
	Incremental Number of
Option Shares Exercisable*	  	Exercisability Date
		
	
                
             (            %)
	  	                        
		
	
                
             (            %)
	  	                        
		
	
                
             (            %)
	  	                        
		
	
                
             (            %)
	  	                        
		
	
                
             (            %)
	  	                        

  

	*	 Max. of $100,000 per yr. 

Once exercisable, this Stock Option shall continue to be exercisable at any time or times prior to the close of business on the Expiration
Date, subject to the provisions hereof and of the Plan. 

 2. Manner of Exercise. 

(a) The Optionee may exercise this Stock Option only in the following manner: from time to time on or prior to the Expiration Date of this
Stock Option, the Optionee may give written notice to the Administrator of his or her election to purchase some or all of the Option Shares purchasable at the time of such notice. This notice shall specify the number of Option Shares to be
purchased. 
 Payment of the purchase price for the Option Shares may be made by one or more of the following methods: (i) in cash, by
certified or bank check or other instrument acceptable to the Administrator; (ii) through the delivery (or attestation to the ownership) of shares of Stock that have been purchased by the Optionee on the open market or that are beneficially
owned by the Optionee and are not then subject to any restrictions under any Company plan and that otherwise satisfy any holding periods as may be required by the Administrator; or (iii) by the Optionee delivering to the Company a properly
executed exercise notice together with irrevocable instructions to a broker to promptly deliver to the Company cash or a check payable and acceptable to the Company to pay the option purchase price, provided that in the event the Optionee chooses to
pay the option purchase price as so provided, the Optionee and the broker shall comply with such procedures and enter into such agreements of indemnity and other agreements as the Administrator shall prescribe as a condition of such payment
procedure; or (iv) a combination of (i), (ii) and (iii) above. Payment instruments will be received subject to collection. 

The transfer to the Optionee on the records of the Company or of the transfer agent of the Option Shares will be contingent upon (i) the
Company’s receipt from the Optionee of the full purchase price for the Option Shares, as set forth above, (ii) the fulfillment of any other requirements contained herein or in the Plan or in any other agreement or provision of laws, and
(iii) the receipt by the Company of any agreement, statement or other evidence that the Company may require to satisfy itself that the issuance of Stock to be purchased pursuant to the exercise of Stock Options under the Plan and any subsequent
resale of the shares of Stock will be in compliance with applicable laws and regulations. In the event the Optionee chooses to pay the purchase price by previously-owned shares of Stock through the attestation method, the number of shares of Stock
transferred to the Optionee upon the exercise of the Stock Option shall be net of the Shares attested to. 
 (b) The shares of Stock
purchased upon exercise of this Stock Option shall be transferred to the Optionee on the records of the Company or of the transfer agent upon compliance to the satisfaction of the Administrator with all requirements under applicable laws or
regulations in connection with such transfer and with the requirements hereof and of the Plan. The determination of the Administrator as to such compliance shall be final and binding on the Optionee. The Optionee shall not be deemed to be the holder
of, or to have any of the rights of a holder with respect to, any shares of Stock subject to this Stock Option unless and until this Stock Option shall have been exercised pursuant to the terms hereof, the Company or the transfer agent shall have
transferred the shares to the Optionee, and the Optionee’s name shall have been entered as the stockholder of record on the books of the Company. Thereupon, the Optionee shall have full voting, dividend and other ownership rights with respect
to such shares of Stock. 

  
 2 

 (c) The minimum number of shares with respect to which this Stock Option may be exercised at
any one time shall be 100 shares, unless the number of shares with respect to which this Stock Option is being exercised is the total number of shares subject to exercise under this Stock Option at the time. 

(d) Notwithstanding any other provision hereof or of the Plan, no portion of this Stock Option shall be exercisable after the Expiration Date
hereof. 
 3. Termination of Service Relationship. If the Optionee’s Service Relationship with the Company or a Subsidiary (as
defined in the Plan) is terminated, the period within which to exercise the Stock Option may be subject to earlier termination as set forth below. 

(a) Termination Due to Death. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates by reason of the
Optionee’s death, any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of death, may thereafter be exercised by the Optionee’s legal representative or legatee for a period of 12 months from the
date of death or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of death shall terminate immediately and be of no further force or effect. 

(b) Termination Due to Disability. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates by reason of
the Optionee’s disability (as determined by the Administrator), any portion of this Stock Option outstanding on such date, to the extent exercisable on the date of such termination, may thereafter be exercised by the Optionee for a period of 12
months from the date of disability or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of disability shall terminate immediately and be of no further force or effect. 

(c) Termination for Cause. If the Optionee’s Service Relationship with the Company or a Subsidiary terminates for Cause, any
portion of this Stock Option outstanding on such date shall terminate immediately and be of no further force and effect. For purposes hereof, “Cause” shall mean, unless otherwise provided in an employment or service agreement between the
Company and the Optionee, a determination by the Administrator that the Optionee shall be dismissed as a result of (i) any material breach by the Optionee of any agreement between the Optionee and the Company; (ii) the conviction of,
indictment for or plea of nolo contendere by the Optionee to a felony or a crime involving moral turpitude; or (iii) any material misconduct or willful and deliberate non-performance (other than by reason of disability) by the Optionee of the
Optionee’s duties to the Company. 
 (d) Other Termination. If the Optionee’s Service Relationship with the Company or a
Subsidiary terminates for any reason other than the Optionee’s death, the Optionee’s disability, or Cause, and unless otherwise determined by the Administrator, any portion of this Stock Option outstanding on such date may be exercised, to
the extent exercisable on the date of termination, for a period of three months from the date of termination or until the Expiration Date, if earlier. Any portion of this Stock Option that is not exercisable on the date of termination shall
terminate immediately and be of no further force or effect. 

  
 3 

 The Administrator’s determination of the reason for termination of the Optionee’s
Service Relationship with the Company or a Subsidiary shall be conclusive and binding on the Optionee and his or her representatives or legatees. 

4. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Stock Option shall be subject to and governed by all
the terms and conditions of the Plan, including the powers of the Administrator set forth in Section 2(b) of the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified
herein. 
 5. Transferability. This Agreement is personal to the Optionee, is non-assignable and is not transferable in any manner,
by operation of law or otherwise, other than by will or the laws of descent and distribution. This Stock Option is exercisable, during the Optionee’s lifetime, only by the Optionee, and thereafter, only by the Optionee’s legal
representative or legatee. 
 6. Status of the Stock Option. This Stock Option is intended to qualify as an
“incentive stock option” under Section 422 of the Internal Revenue Code of 1986, as amended (the “Code”), but the Company does not represent or warrant that this Stock Option qualifies as such. The Optionee should consult
with his or her own tax advisors regarding the tax effects of this Stock Option and the requirements necessary to obtain favorable income tax treatment under Section 422 of the Code, including, but not limited to, holding period requirements
and that this Stock Option must be exercised within three months after termination of employment as an employee (or 12 months in the case of death or disability) to qualify as an “incentive stock option.” To the extent any
portion of this Stock Option does not so qualify as an “incentive stock option,” such portion shall be deemed to be a non-qualified stock option. If the Optionee intends to dispose or does dispose (whether by sale, gift, transfer or
otherwise) of any Option Shares within the one-year period beginning on the date after the transfer of such shares to him or her, or within the two-year period beginning on the day after the grant of this Stock Option, he or she will so notify the
Company within 30 days after such disposition. 
 7. Responsibility for Taxes. 

(a) The Optionee acknowledges that, regardless of any action taken by the Company or, if different, the Subsidiary employing the Optionee (the
“Employer”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related items related to the Optionee’s participation
in the Plan and legally applicable to the Optionee (“Tax-Related Items”) is and remains the Optionee’s responsibility and may exceed the amount, if any, actually withheld by the Company or the Employer. The Optionee further
acknowledges that the Company and/or the Employer (i) make no representations or undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of this Stock Option, including, but not limited to, the grant, vesting
or exercise of this Stock Option, the subsequent sale of shares of Stock acquired pursuant to such exercise and the receipt of any dividends; and (ii) do not commit to and are under no obligation to structure the terms of the grant or any
aspect of this Stock Option to reduce or eliminate the Optionee’s liability for Tax-Related Items or achieve any particular tax result. Further, if the Optionee is subject to Tax-Related Items in more than one jurisdiction, the Optionee
acknowledges that the Company and/or the Employer (or former employer, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction. 

  
 4 

 (b) Prior to any relevant taxable or tax withholding event, as applicable, the Optionee
agrees to make adequate arrangements satisfactory to the Company and/or the Employer to satisfy all Tax-Related Items. In this regard, the Optionee authorizes the Company and/or the Employer, or their respective agents, at their discretion, to
satisfy any applicable withholding obligations with regard to all Tax-Related Items by one or a combination of the following: (i) withholding from the Optionee’s wages or other cash compensation paid to the Optionee by the Company and/or
the Employer; (ii) allowing or requiring the Optionee to make a cash payment to cover the Tax-Related Items; (iii) withholding from proceeds of the sale of shares of Stock acquired upon exercise of this Stock Option either through a
voluntary sale or through a mandatory sale arranged by the Company (on the Optionee’s behalf pursuant to this authorization without further consent); (iv) withholding from the shares of Stock to be issued to the Optionee upon exercise of
this Stock Option; or (v) any other method of withholding determined by the Company and permitted by applicable law; provided, however, that that if the Optionee is a Section 16 officer of the Company under the Exchange Act, in which case,
the obligation for Tax-Related Items may be satisfied only by one or a combination of methods (i), (ii) and (iii) above. 
 (c)
Depending on the withholding method, the Company and/or the Employer may withhold or account for Tax-Related Items by considering applicable statutory withholding amounts or other applicable withholding rates, including maximum rates applicable in
the Optionee’s jurisdiction, in which case the Optionee may receive a refund of any over-withheld amount in cash and will have no entitlement to the equivalent amount in shares of Stock. If the obligation for Tax-Related Items is satisfied by
withholding in shares of Stock, for tax purposes, the Optionee is deemed to have been issued the full number of shares of Stock subject to the exercised Stock Option, notwithstanding that a number of the shares of Stock is held back solely for the
purpose of paying the Tax-Related Items. 
 (d) The Optionee agrees to pay to the Company or the Employer any amount of Tax-Related Items
that the Company or the Employer may be required to withhold or account for as a result of the Optionee’s participation in the Plan that cannot be satisfied by the means previously described. The Company may refuse to issue or deliver the
shares of Stock, or the proceeds of the sale of shares of Stock, if the Optionee fails to comply with his or her obligations in connection with the Tax-Related Items. 

8. No Obligation to Continue Service Relationship. Neither the Company nor any Subsidiary is obligated by or as a result of the Plan or
this Agreement to continue the Optionee in a Service Relationship with the Company or a Subsidiary and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any Subsidiary to terminate the Optionee’s
Service Relationship with the Company or a Subsidiary at any time. 
 9. Integration. This Agreement constitutes the entire agreement
between the parties with respect to this Stock Option and supersedes all prior agreements and discussions between the parties concerning such subject matter. 

  
 5 

 10. Data Privacy Consent. In order to administer the Plan and this Agreement and to
implement or structure future equity grants, the Company, its subsidiaries and affiliates and certain agents thereof (together, the “Relevant Companies”) may process any and all personal or professional data, including but not limited to
Social Security or other identification number, home address and telephone number, date of birth and other information that is necessary or desirable for the administration of the Plan and/or this Agreement (the “Relevant Information”). By
entering into this Agreement, the Optionee (i) authorizes the Company to collect, process, register and transfer to the Relevant Companies all Relevant Information; (ii) waives any privacy rights the Optionee may have with respect to the
Relevant Information; (iii) authorizes the Relevant Companies to store and transmit such information in electronic form; and (iv) authorizes the transfer of the Relevant Information to any jurisdiction in which the Relevant Companies
consider appropriate. The Optionee shall have access to, and the right to change, the Relevant Information. Relevant Information will only be used in accordance with applicable law. 

11. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or
delivered to the Optionee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing. 

12. Waivers. The Optionee acknowledges that a waiver by the Company of breach of any provision of this Agreement shall not operate or
be construed as a waiver of any other provision of this Agreement, or of any subsequent breach by the Optionee or any other Optionee. 
 13.
Severability. The provisions of this Agreement are severable and if any one or more provisions are determined to be illegal or otherwise unenforceable, in whole or in part, the remaining provisions shall nevertheless be binding and
enforceable. 
 14. Electronic Delivery and Acceptance of Documents. The Company may, in its sole discretion, decide to deliver any
documents related to current or future participation in the Plan by electronic means. The Optionee hereby consents to receive such documents by electronic delivery and agree to participate in the Plan through an on-line or electronic system
established and maintained by the Company or a third party designated by the Company. 

  
 6 

 
			
	AlloVir, Inc.
		
	By:	 	 
		 	Title:

 The foregoing Agreement is hereby accepted and the terms and conditions thereof hereby agreed to by the undersigned.
Electronic acceptance of this Agreement pursuant to the Company’s instructions to the Optionee (including through an online acceptance process) is acceptable. 
  

							
				
	Dated:	 	 	 		 	 
		 		 		 	Optionee’s Signature
				
		 		 		 	Optionee’s name and address:
				
		 		 		 	 
				
		 		 		 	 
				
		 		 		 	 

  
 7EX-10.3

 Exhibit 10.3 

ALLOVIR, INC. 
 2020
EMPLOYEE STOCK PURCHASE PLAN 
 The purpose of the AlloVir, Inc. 2020 Employee Stock Purchase Plan (the “Plan”) is to provide
eligible employees of AlloVir, Inc. (the “Company”) and each Designated Company (as defined in Section 11) with opportunities to purchase shares of the Company’s common stock, par value $0.0001 per share (the “Common
Stock”). 611,354 shares of Common Stock in the aggregate have been approved and reserved for this purpose, plus on January 1, 2021 and each January 1 thereafter until January 1, 2030, the number of shares of Common Stock reserved
and available for issuance under the Plan shall be cumulatively increased by the least of (i) 1,222,707 shares of Common Stock, (ii) 1% of the number of shares of Common Stock issued and outstanding on the immediately preceding December 31, and
(iii) such number of shares of Common Stock as determined by the Administrator (as defined in Section 1). 
 The Plan includes two
components: a Code Section 423 Component (the “423 Component”) and a non-Code Section 423 Component (the “Non-423 Component”). It is
intended for the 423 Component to constitute an “employee stock purchase plan” within the meaning of Section 423(b) of the U.S. Internal Revenue Code of 1986, as amended (the “Code”), and the 423 Component shall be
interpreted in accordance with that intent. Under the Non-423 Component, which does not qualify as an “employee stock purchase plan” within the meaning of Section 423(b) of the Code, options
will be granted pursuant to rules, procedures or sub-plans adopted by the Administrator designed to achieve tax, securities laws or other objectives for eligible employees. Except as otherwise provided herein,
the Non-423 Component will operate and be administered in the same manner as the 423 Component. 

 Unless otherwise defined herein, capitalized terms in this Plan shall have the meaning
ascribed to them in Section 11. 
 1.    Administration. The Plan will be administered by the person or
persons (the “Administrator”) appointed by the Company’s Board of Directors (the “Board”) for such purpose. The Administrator has authority at any time to: (i) adopt, alter and repeal such rules, guidelines and
practices for the administration of the Plan and for its own acts and proceedings as it shall deem advisable; (ii) interpret the terms and provisions of the Plan; (iii) make all determinations it deems advisable for the administration of
the Plan, including to accommodate the specific requirements of local laws, regulations and procedures for jurisdictions outside the United States; (iv) decide all disputes arising in connection with the Plan; and (v) otherwise supervise
the administration of the Plan. All interpretations and decisions of the Administrator shall be binding on all persons, including the Company and the Participants. No member of the Board or individual exercising administrative authority with respect
to the Plan shall be liable for any action or determination made in good faith with respect to the Plan or any option granted hereunder. 

2.    Offerings. The Company may make one or more offerings to eligible employees to purchase Common Stock under
the Plan (“Offerings”) consisting of one or more Purchase Periods. The Administrator shall determine when the initial Offering shall commence and the duration of such Offering. The Administrator may, in its discretion, designate a
different period for any Offering, provided that no Offering shall exceed 27 months in duration. 

3.    Eligibility. All individuals classified as employees on the payroll records of the Company and each
Designated Company are eligible to participate in any one or more of the Offerings under the Plan, provided that, unless otherwise determined by the Administrator in 

  
 2 

 
advance of any Offering, as of the first day of the applicable Offering (the “Offering Date”) they are customarily employed by the Company or a Designated Company for more than 20 hours
a week and have completed at least 30 days of employment, provided, however, that employees who are employed for 20 hours or less a week may be eligible to participate in the Plan if required by applicable law or regulations. Notwithstanding any
other provision herein, individuals who are not contemporaneously classified as employees of the Company or a Designated Company for purposes of the Company’s or applicable Designated Company’s payroll system are not considered to be
eligible employees of the Company or any Designated Company and shall not be eligible to participate in the Plan. In the event any such individuals are reclassified as employees of the Company or a Designated Company for any purpose, including,
without limitation, common law or statutory employees, by any action of any third party, including, without limitation, any government agency, or as a result of any private lawsuit, action or administrative proceeding, such individuals shall,
notwithstanding such reclassification, remain ineligible for participation. Notwithstanding the foregoing, the exclusive means for individuals who are not contemporaneously classified as employees of the Company or a Designated Company on the
Company’s or Designated Company’s payroll system to become eligible to participate in this Plan is through an amendment to this Plan, duly executed by the Company, which specifically renders such individuals eligible to participate herein.

 4.    Participation. 

(a)    An eligible employee who is not a Participant in any prior Offering may participate in a subsequent Offering by
submitting an enrollment form (in the manner described in Section 4(b)) at least 15 business days before the Offering Date (or by such other deadline as shall be established by the Administrator for the Offering). 

  
 3 

 (b)    Enrollment. The enrollment form (which may be in an
electronic format or such other method as determined by the Company in accordance with the Company’s practices) will (a) state a whole percentage to be deducted from an eligible employee’s Compensation (as defined in Section 11)
per pay period, (b) authorize the purchase of Common Stock in each Offering in accordance with the terms of the Plan and (c) specify the exact name or names in which shares of Common Stock purchased for such individual are to be issued
pursuant to Section 10. An employee who does not enroll in accordance with these procedures will be deemed to have waived the right to participate. Unless a Participant files a new enrollment form or withdraws from the Plan, such
Participant’s deductions and purchases will continue at the same percentage of Compensation for future Offerings, provided he or she remains eligible. 

(c)    Notwithstanding the foregoing, participation in the Plan will neither be permitted nor be denied contrary to the
requirements of the Code. 
 5.    Employee Contributions. Each eligible employee may authorize payroll
deductions at a minimum of 1 percent up to a maximum of 15 percent of such employee’s Compensation for each pay period, or such other maximum as the Administrator may determine. The Company will maintain book accounts showing the
amount of payroll deductions made by each Participant for each Purchase Period. No interest will accrue or be paid on payroll deductions, except as may be required by applicable law. If payroll deductions for purposes of the Plan are prohibited or
otherwise problematic under applicable law (as determined by the Administrator in its discretion), the Administrator may require Participants to contribute to the Plan by such other means as determined by the Administrator. Any reference to
“payroll deductions” in this Section 5 (or in any other section of the Plan ) will similarly cover contributions by other means made pursuant to this Section 5. 

  
 4 

 6.    Deduction Changes. Except as may be determined by the
Administrator in advance of an Offering, a Participant may not increase or decrease his or her payroll deduction during any Offering, but may increase or decrease his or her payroll deduction with respect to the next Offering (subject to the
limitations of Section 5) by filing a new enrollment form at least 15 business days before the next Offering Date (or by such other deadline as shall be established by the Administrator for the Offering). The Administrator may, in advance of
any Offering, establish rules permitting a Participant to increase, decrease or terminate his or her payroll deduction during an Offering. 

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

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

  
 5 

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

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

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

The term “Affiliate” means any entity that, directly or indirectly through one or more intermediaries, controls, is controlled by or
is under the common control with, the Company. 
 The term “Compensation” means the amount of base pay, prior to salary reduction
(such as pursuant to Sections 125, 132(f) or 401(k) of the Code), but excluding overtime, commissions, incentive or bonus awards, allowances and reimbursements for expenses such as relocation allowances or travel expenses, income or gains
related to Company stock options or other share-based awards, and similar items. The Administrator shall have the discretion to determine the application of this definition to Participants outside the United States. 

The term “Designated Company” means any present or future Subsidiary or Affiliate that has been designated by the Administrator to
participate in the Plan. The Administrator may so designate any Subsidiary or Affiliate, or revoke any such designation, at any time and from time 

  
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to time, either before or after the Plan is approved by the stockholders, and may further designate such companies or Participants as participating in the 423 Component or the Non-423 Component. The Administrator may also determine which Affiliates or eligible employees may be excluded from participation in the Plan, to the extent consistent with Section 423 of the Code or as
implemented under the Non-423 Component, and determine which Designated Company or Companies will participate in separate Offerings (to the extent that the Company makes separate Offerings). For purposes of
the 423 Component, only the Company and its Subsidiaries may be Designated Companies; provided, however, that at any given time, a Subsidiary that is a Designated Company under the 423 Component will not be a Designated Company under the Non-423 Component. 
 The term “Fair Market Value of the Common Stock” on any given date means
the fair market value of the Common Stock determined in good faith by the Administrator; provided, however, that if the Common Stock is admitted to quotation on the NASDAQ Global Market or another national securities exchange, the determination
shall be made by reference to the closing price on such date. If there is no closing price for such date, the determination shall be made by reference to the last date preceding such date for which there is a closing price. 

The term “Initial Public Offering” means the first underwritten, firm commitment public offering pursuant to an effective
registration statement under the U.S. Securities Act of 1933, as amended, covering the offer and sale by the Company of its Common Stock. 

The term “Parent” means a “parent corporation” with respect to the Company, as defined in Section 424(e) of the Code.

 The term “Participant” means an individual who is eligible as determined in Section 3 and who has complied with the
provisions of Section 4. 

  
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 The term “Purchase Period” means a period of time specified within an Offering
beginning on the Offering Date or on the next day following an Exercise Date within an Offering and ending on an Exercise Date. An Offering may consist of one or more Purchase Periods. 

The term “Registration Date” means the date on which the registration statement on Form S-1
that is filed by the Company with respect to its Initial Public Offering is declared effective by the U.S. Securities and Exchange Commission (the “SEC”). 

The term “Subsidiary” means a “subsidiary corporation” with respect to the Company, as defined in Section 424(f) of
the Code. 
 12.    Rights on Termination or Transfer of Employment. If a Participant’s employment
terminates for any reason before the Exercise Date for any Offering, no payroll deduction will be taken from any pay due and owing to the Participant and the balance in the Participant’s account will be paid to such Participant or, in the case
of such Participant’s death, to the legal representative of his or her estate as if such Participant had withdrawn from the Plan under Section 7. An employee will be deemed to have terminated employment, for this purpose, if the
corporation that employs him or her, having been a Designated Company, ceases to be a Subsidiary or Affiliate, or if the employee is transferred to any corporation other than the Company or a Designated Company. Unless otherwise determined by the
Administrator, a Participant whose employment transfers between, or whose employment terminates with an immediate rehire (with no break in service) by, Designated Companies or a Designated Company and the Company will not be treated as having
terminated employment for purposes of participating in the Plan or an Offering; provided, however, that if a Participant transfers from an Offering under the 423 Component to an Offering under the Non-423
Component, the exercise of the Participant’s Option will be qualified under the 423 Component only to the extent that such exercise complies with Section 423 of the Code. If a Participant transfers from an Offering under the Non-423 Component to an Offering under the 423 Component, the exercise of the Participant’s Option will remain non-qualified under the
Non-423 Component. Further, an employee will not be deemed to have terminated employment for purposes of this Section 12, if the employee is on an approved leave of absence where the employee’s right
to reemployment is guaranteed either by a statute or by contract or under the policy pursuant to which the leave of absence was granted or if the Administrator otherwise provides in writing. 

  
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 13.    Special Rules and
Sub-Plans. Notwithstanding anything herein to the contrary, the Administrator may adopt special rules or sub-plans applicable to the employees of a particular
Designated Company, whenever the Administrator determines that such rules are necessary or appropriate for the implementation of the Plan in a jurisdiction where such Designated Company has employees, regarding, without limitation, eligibility to
participate in the Plan, handling and making of payroll deductions or contributions by other means, establishment of bank or trust accounts to hold payroll deductions, payment of interest, conversion of local currency, obligations to pay payroll
tax, withholding procedures and handling of share issuances, any of which may vary according to applicable requirements; provided that if such special rules or sub-plans are inconsistent with the requirements
of Section 423(b) of the Code, the employees subject to such special rules or sub-plans will participate in the Non-423 Component. 

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

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

16.    Application of Funds. All funds received or held by the Company under the Plan may be combined with other
corporate funds and may be used for any corporate purpose, unless otherwise required under applicable law. 

17.    Adjustment in Case of Changes Affecting Common Stock. In the event of a subdivision of outstanding shares of
Common Stock, the payment of a dividend in Common Stock or any other change affecting the Common Stock, the number of shares approved for the Plan and the share limitation set forth in Section 8 shall be equitably or proportionately adjusted to
give proper effect to such event. 
 18.    Amendment of the Plan. The Board may at any time amend the Plan in
any respect, except that without the approval within 12 months of such Board action by the stockholders, no amendment shall be made increasing the number of shares approved for the Plan or making any other change that would require stockholder
approval in order for the 423 Component of the Plan, as amended, to qualify as an “employee stock purchase plan” under Section 423(b) of the Code. 

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

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

21.    Governmental Regulations. The Company’s obligation to sell and deliver Common Stock under the Plan is
subject to the completion of any registration or qualification of the Common Stock under any U.S. or non-U.S. local, state or federal securities or exchange control law, or under rulings or regulations of the
SEC or of any other governmental regulatory body, and to obtaining any approval or other clearance from any U.S. and non-U.S. local, state or federal governmental agency, which registration, qualification or
approval the Company shall, in its absolute discretion, deem necessary or advisable. The Company is under no obligation to register or qualify the Common Stock with the SEC or any other U.S. or non-U.S.
securities commission or to seek approval or clearance from any governmental authority for the issuance or sale of such stock. 

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

  
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 24.    Tax Withholding. Participation in the Plan is subject to
any applicable U.S. and non-U.S. federal, state or local tax withholding requirements on income the Participant realizes in connection with the Plan. Each Participant agrees, by entering the Plan, that the
Company or any Subsidiary or Affiliate may, but will not be obligated to, withhold from Participant’s wages, salary or other compensation at any time the amount necessary for the Company or any Subsidiary or Affiliate to meet applicable
withholding obligations, including any withholding required to make available to the Company or any Subsidiary or Affiliate any tax deductions or benefits attributable to the sale or disposition of Common Stock by such Participant. In addition, the
Company or any Subsidiary or Affiliate may, but will not be obligated to, withhold from the proceeds of the sale of Common Stock or any other method of withholding that the Company or any Subsidiary or Affiliate deems appropriate to the extent
permitted by U.S. Treasury Regulation Section 1.423-2(f) with respect to the 423 Component. The Company will not be required to issue any Common Stock under the Plan until such obligations are satisfied.

 25.    Notification Upon Sale of Shares Under the 423 Component. Each Participant agrees, by entering the 423
Component of the Plan, to give the Company prompt notice of any disposition of shares purchased under the Plan where such disposition occurs within two years after the date of grant of the Option pursuant to which such shares were purchased or
within one year after the date such shares were purchased. 
 26.    Effective Date and Approval of Shareholders.
The Plan shall take effect on the date immediately preceding the Registration Date, subject to prior approval by the holders of a majority of the votes cast at a meeting of stockholders at which a quorum is present or by written consent of the
stockholders. 

  
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