Document:

EX-10.1

 Exhibit 10.1 

NEXIMMUNE, INC. 

INDEMNIFICATION AGREEMENT 
 THIS
INDEMNIFICATION AGREEMENT (this “Agreement”) is made and entered into this     th day of
                , 20    , by and between NexImmune, Inc. a Delaware corporation (the “Company”), and
                 (“Indemnitee”). 

WHEREAS, qualified persons are reluctant to serve corporations as directors or otherwise unless they are provided with broad indemnification
and insurance against claims arising out of their service to and activities on behalf of the corporations; and 
 WHEREAS, the Company has
determined that attracting and retaining such persons is in the best interests of the Company’s stockholders and that it is reasonable, prudent and necessary for the Company to indemnify such persons to the fullest extent permitted by
applicable law and to provide reasonable assurance regarding insurance; 
 NOW, THEREFORE, the Company and Indemnitee hereby agree as
follows: 
  

	 	1.	 Defined Terms; Construction. 

(a)    Defined Terms. As used in this Agreement, the following terms shall have the following meanings: 

“Change in Control” means, and shall be deemed to have occurred if, on or after the date of this Agreement,
(i) any “person” (as such term is used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), other than (A) a trustee or other fiduciary
holding securities under an employee benefit plan of the Company or any of its subsidiaries acting in such capacity, or (B) a corporation owned directly or indirectly by the stockholders of the Company in substantially the same
proportions as their ownership of stock of the Company, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of securities of the
Company representing more than 20% of the total voting power represented by the Company’s then outstanding Voting Securities, (ii) during any period of two consecutive years, individuals who at the beginning of such period
constitute the board of directors of the Company and any new director whose election by the board of directors of the Company or nomination for election by the Company’s stockholders was approved by a vote of at least two-thirds (2/3) of the directors then still in office who either were directors at the beginning of the period or whose election or nomination for election was previously so approved, cease for any reason to
constitute a majority thereof, (iii) the stockholders of the Company approve a merger or consolidation of the Company with any other corporation other than a merger or consolidation that would result in the Voting Securities of the
Company outstanding immediately prior thereto continuing to represent (either by remaining outstanding or by being converted into Voting Securities of the surviving entity) at least 80% of the total voting power represented by the Voting Securities
of the Company or such surviving entity outstanding immediately after such merger or consolidation, (iv) the stockholders of the Company approve a plan of complete liquidation of the Company or an agreement for the sale or

  
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disposition by the Company of (in one transaction or a series of related transactions) all or substantially all of its assets, or (v) the Company shall file or have filed against it,
and such filing shall not be dismissed, any bankruptcy, insolvency or dissolution proceedings, or a trustee, administrator or creditors committee shall be appointed to manage or supervise the affairs of the Company. 

“Corporate Status” means the status of a person who is or was a director (or a member of any committee of a board of
directors), officer, employee or agent (including without limitation a manager of a limited liability company) of the Company or any of its subsidiaries, or of any predecessor thereof, or is or was serving at the request of the Company as a director
(or a member of any committee of a board of directors), officer, employee or agent (including without limitation a manager of a limited liability company) of another entity, or of any predecessor thereof, including service with respect to an
employee benefit plan. 
 “Determination” means a determination that either (x) there is a reasonable basis for
the conclusion that indemnification of Indemnitee is proper in the circumstances because Indemnitee met a particular standard of conduct (a “Favorable Determination”) or (y) there is no reasonable basis for the
conclusion that indemnification of Indemnitee is proper in the circumstances because Indemnitee met a particular standard of conduct (an “Adverse Determination”). An Adverse Determination shall include the decision that a
Determination was required in connection with indemnification and the decision as to the applicable standard of conduct. 

“DGCL” means the General Corporation Law of the State of Delaware, as amended from time to time. 

“Expenses” means all (i) attorneys’ fees and expenses, retainers, court, arbitration and mediation costs,
transcript costs, fees and expenses of experts, witness and public relations consultants bonds and fees, traveling expenses, costs of collecting and producing documents, travel expenses, duplicating costs, printing and binding costs, telephone
charges, postage, delivery service fees and all other disbursements or expenses of the types customarily incurred in connection with prosecuting, defending, preparing to prosecute or defend, investigating, being or preparing to be a witness in,
appealing or otherwise participating in a Proceeding or responding to, or objecting to, a request to provide discovery in any Proceeding, (ii) damages, judgments, fines and amounts paid in settlement and any other amounts that Indemnitee
becomes legally obligated to pay (including any federal, state or local taxes imposed on Indemnitee as a result of receipt of reimbursements or advances of expenses under this Agreement) and (iii) the premium, security for, and other
costs relating to any costs bond, supersedes bond or other appeal bond or its equivalent, whether civil, criminal, arbitrational, administrative or investigative with respect to any Proceeding actually and reasonably incurred by Indemnitee, or on
Indemnitee’s behalf, because of any claim or claims made against or by him in connection with any Proceeding, whether formal or informal (including an action by or in the right of the Company), to which Indemnitee is, was or at any time becomes
a party or a witness, or is threatened to be made a party to, participant in or a witness with respect to, by reason of Indemnitee’ Corporate Status. 

“Independent Legal Counsel” means an attorney or firm of attorneys competent to render an opinion under the applicable law,
selected in accordance with the provisions of Section 5(e), who has not performed any services (other than services similar to those contemplated to be performed by Independent Legal Counsel under this Agreement) for the Company or any of its
subsidiaries or for Indemnitee within the last three years. 

  
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 “Proceeding” means a threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative, including without limitation a claim, demand, discovery request, formal or informal investigation, inquiry, administrative hearing, arbitration or other form of alternative
dispute resolution, including an appeal from any of the foregoing. 
 “Voting Securities” means any securities of the
Company that vote generally in the election of directors. 
 (b)    Construction. For purposes of this Agreement,

 (i)    References to the Company and any of its “subsidiaries” shall include any
corporation, limited liability company, partnership, joint venture, trust or other entity or enterprise that before or after the date of this Agreement is party to a merger or consolidation with the Company or any such subsidiary or that is a
successor to the Company as contemplated by Section 8(e) (whether or not such successor has executed and delivered the written agreement contemplated by Section 8(e)). 

(ii)    References to “fines” shall include any excise taxes assessed on Indemnitee with respect
to an employee benefit plan. 
 (iii)    References to a “witness” in connection with a
Proceeding shall include any interviewee or person called upon to produce documents in connection with such Proceeding. 
  

	 	2.	 Agreement to Serve. 

Indemnitee agrees to serve as a director of the Company or one or more of its subsidiaries and in such other capacities as Indemnitee may serve
at the request of the Company from time to time, and by its execution of this Agreement the Company confirms its request that Indemnitee serve as a director and in such other capacities. Indemnitee shall be entitled to resign or otherwise terminate
such service with immediate effect at any time, and neither such resignation or termination nor the length of such service shall affect Indemnitee’s rights under this Agreement. This Agreement shall not constitute an employment agreement,
supersede any employment agreement to which Indemnitee is a party or create any right of Indemnitee to continued employment or appointment. 
  

	 	3.	 Indemnification. 

(a)    General Indemnification. The Company shall indemnify Indemnitee, to the fullest extent permitted by
applicable law in effect on the date hereof or as amended to increase the scope of permitted indemnification, against Expenses, losses, liabilities, judgments, fines, penalties and amounts paid in settlement (including all interest, taxes,
assessments and other charges in connection therewith) incurred by Indemnitee or on Indemnitee’s behalf in connection with any Proceeding in any way connected with, resulting from or relating to Indemnitee’s Corporate Status. 

  
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 (b)    Additional Indemnification Regarding Expenses. Without
limiting the foregoing, in the event any Proceeding is initiated by Indemnitee, the Company or any other person to enforce or interpret this Agreement or any rights of Indemnitee to indemnification or advancement of Expenses (or related obligations
of Indemnitee) under the Company’s or any such subsidiary’s certificate of incorporation, bylaws or other organizational agreement or instrument, any other agreement to which Indemnitee and the Company or any of its subsidiaries are party,
any vote of stockholders or directors of the Company or any of its subsidiaries, the DGCL, any other applicable law or any liability insurance policy, the Company shall indemnify Indemnitee against Expenses incurred by Indemnitee or on
Indemnitee’s behalf in connection with such Proceeding in proportion to the success achieved by Indemnitee in such Proceeding and the efforts required to obtain such success, as determined by the court presiding over such Proceeding. 

(c)    Partial Indemnification. If Indemnitee is entitled under any provision of this Agreement to indemnification
by the Company for a portion of any Expenses, losses, liabilities, judgments, fines, penalties and amounts paid in settlement incurred by Indemnitee, but not for the total amount thereof, the Company shall nevertheless indemnify Indemnitee for such
portion. 
 (d)    Nonexclusivity. The indemnification provided by this Agreement shall not be deemed exclusive of
any rights to which Indemnitee may be entitled under the certificate of incorporation, bylaws or other organizational agreement or instrument of the Company or any of its subsidiaries, any other agreement, any vote of stockholders or directors, the
DGCL, any other applicable law or any liability insurance policy. 
 (e)    Exceptions. Any other provision herein
to the contrary notwithstanding, the Company shall not be obligated under the Agreement to indemnify Indemnitee: 

(i)    For Expenses incurred in connection with Proceedings initiated or brought voluntarily by the
Indemnitee and not by way of defense, counterclaim or crossclaim, except (x) as contemplated by Section 3(b), (y) in specific cases if the board of directors of the Company has approved the initiation or bringing of such
Proceeding, and (z) as may be required by law. 
 (ii)    For an accounting of profits
arising from the purchase and sale by the Indemnitee of securities within the meaning of Section 16(b) of the Exchange Act or any similar provisions of any federal, state or local law if the final,
non-appealable judgment of a court of competent jurisdiction finds Indemnitee to be liable for disgorgement under such Section 16(b). 

(iii)    On account of Indemnitee’s conduct that is established by a final, non-appealable judgment of a court of competent jurisdiction as knowingly fraudulent or deliberately dishonest or that constituted willful misconduct. 

  
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 (iv)    For which payment is actually made to Indemnitee
under a valid and collectible insurance policy or under a valid and enforceable indemnity clause, bylaw or agreement, except in respect of any excess beyond payment actually received by Indemnitee under such insurance, clause, bylaw or agreement,
provided, that the foregoing shall not affect the rights of Indemnitee or the Fund Indemnitors set forth in Section 3(f) below. 

(v)    if and to the extent indemnification is prohibited by applicable law. 

(f)    Primacy of Indemnification. The Company hereby acknowledges that Indemnitee may have certain rights to
indemnification, advancement of expenses and/or insurance provided by a fund or other entity with which Indemnitee is associated or its affiliates (collectively, the “Fund Indemnitors”). The Company hereby agrees (i) that
it is the indemnitor of first resort (i.e., its obligations to Indemnitee are primary and any obligation of the Fund Indemnitors to advance expenses or to provide indemnification for the same expenses or liabilities incurred by Indemnitee are
secondary), (ii) that it shall be required to advance the full amount of expenses incurred by Indemnitee and shall be liable for the full amount of all Expenses, judgments, penalties, fines and amounts paid in settlement to the extent
legally permitted and as required by the terms of this Agreement and the certificate of incorporation, bylaws or other organizational agreement or instrument of the Company (or any other agreement between the Company and Indemnitee), without regard
to any rights Indemnitee may have against the Fund Indemnitors, and (iii) that it irrevocably waives, relinquishes and releases the Fund Indemnitors from any and all claims against the Fund Indemnitors for contribution, subrogation or
any other recovery of any kind in respect thereof. The Company further agrees that no advancement or payment by the Fund Indemnitors on behalf of Indemnitee with respect to any claim for which Indemnitee has sought indemnification from the
Company shall affect the foregoing and the Fund Indemnitors shall have a right of contribution and/or be subrogated to the extent of such advancement or payment to all of the rights of recovery of Indemnitee against the Company. The Company and
Indemnitee agree that the Fund Indemnitors are express third party beneficiaries of the terms of this Section 3(f). 

(g)    Subrogation. Except as provided in Section 3(f) above, in the event of payment under this
Agreement, the Company shall be subrogated to the extent of such payment to all of the rights of recovery of the Indemnitee (other than against the Fund Indemnitors), who shall execute such documents and do such acts as the Company may reasonably
request to secure such rights and to enable the Company effectively to bring suit to enforce such rights. 
  

	 	4.	 Advancement of Expenses. 

The Company shall pay all Expenses incurred by Indemnitee in connection with any Proceeding in any way connected with, resulting from or
relating to Indemnitee’s Corporate Status, other than a Proceeding initiated by Indemnitee for which the Company would not be obligated to indemnify Indemnitee pursuant to Section 3(e)(i), in advance of the final disposition (in accordance
with Section 5(c)) of such Proceeding and without regard to whether Indemnitee will ultimately be entitled to be indemnified for such Expenses and without regard to whether an Adverse Determination has been made, except as contemplated by the
last sentence of Section 5(f). The right to advances under this Section 4 shall in all events continue until final 

  
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disposition of any Proceeding, including any appeal therein. Advances shall be made without regard to Indemnitee’s ability to repay the expenses and without regard to Indemnitee’s
ultimate entitlement to indemnification under the other provisions of this Agreement. Indemnitee shall qualify for advances upon the execution and delivery to the Company of this Agreement, and Indemnitee shall repay such amounts advanced only if
and to the extent that it shall ultimately be determined in a decision by a court of competent jurisdiction from which no appeal can be taken that Indemnitee is not entitled to be indemnified by the Company for such Expenses. The right to
advancement described in this Section 4 is vested. Such repayment obligation shall be unsecured and shall not bear interest. The Company shall not impose on Indemnitee additional conditions to advancement or require from Indemnitee
additional undertakings regarding repayment. 
  

	 	5.	 Indemnification Procedure. 

(a)    Notice of Proceeding; Cooperation. Indemnitee shall give the Company notice in writing as soon as
practicable, and in any event, no later than 30 days after Indemnitee becomes aware, of any Proceeding for which indemnification will or could be sought under this Agreement, provided that any failure or delay in giving such notice shall not
relieve the Company of its obligations under this Agreement unless and to the extent that (i) none of the Company and its subsidiaries are party to or aware of such Proceeding and (ii) the Company is materially prejudiced by
such failure. 
 (b)    Settlement. The Company will not, without the prior written consent of Indemnitee, which
may be provided or withheld in Indemnitee’s sole discretion, effect any settlement of any Proceeding against Indemnitee or which could have been brought against Indemnitee unless such settlement solely involves the payment of money by persons
other than Indemnitee and includes an unconditional release of Indemnitee from all liability on any matters that are the subject of such Proceeding and an acknowledgment that Indemnitee denies all wrongdoing in connection with such matters. The
Company shall not be obligated to indemnify Indemnitee against amounts paid in settlement of a Proceeding against Indemnitee if such settlement is effected by Indemnitee without the Company’s prior written consent, which shall not be
unreasonably withheld. 
 (c)    Request for Payment; Timing of Payment. To obtain indemnification payments or
advances under this Agreement, Indemnitee shall submit to a Company a written request therefor, together with such invoices or other supporting information as may be reasonably requested by the Company and reasonably available to
Indemnitee. The Company shall make indemnification payments to Indemnitee no later than 30 days, and advances to Indemnitee no later than 20 days, after receipt of the written request of Indemnitee. 

(d)    Determination. The Company intends that Indemnitee shall be indemnified to the fullest extent permitted by
law as provided in Section 3 and that no Determination shall be required in connection with such indemnification. In no event shall a Determination be required in connection with advancement of Expenses pursuant to Section 4 or in
connection with indemnification for Expenses incurred as a witness or incurred in connection with any Proceeding or portion thereof with respect to which Indemnitee has been successful on the merits or otherwise. Any decision that a Determination is
required by law in connection with 

  
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any other indemnification of Indemnitee, and any such Determination, shall be made within 30 days after receipt of Indemnitee’s written request for indemnification, as follows: 

(i)    If no Change in Control has occurred, (w) by a majority vote of the directors of the
Company who are not parties to such Proceeding, even though less than a quorum, with the advice of Independent Legal Counsel, or (x) by a committee of such directors designated by majority vote of such directors, even though less than a
quorum, with the advice of Independent Legal Counsel, or (y) if there are no such directors, or if such directors so direct, by Independent Legal Counsel in a written opinion to the Company and Indemnitee, or (z) by the
stockholders of the Company. 
 (ii)    If a Change in Control has occurred, by Independent Legal Counsel
in a written opinion to the Company and Indemnitee. 
 The Company shall pay all Expenses incurred by Indemnitee in connection with a Determination. 

(e)    Independent Legal Counsel. If there has not been a Change in Control, Independent Legal Counsel shall be
selected by the board of directors of the Company and approved by Indemnitee (which approval shall not be unreasonably withheld or delayed). If there has been a Change in Control, Independent Legal Counsel shall be selected by Indemnitee
and approved by the Company (which approval shall not be unreasonably withheld or delayed). The Company shall pay the fees and expenses of Independent Legal Counsel and indemnify Independent Legal Counsel against any and all expenses (including
attorneys’ fees), claims, liabilities and damages arising out of or relating to its engagement. 

(f)    Consequences of Determination; Remedies of Indemnitee. The Company shall be bound by and shall have no right
to challenge a Favorable Determination. If an Adverse Determination is made, or if for any other reason the Company does not make timely indemnification payments or advances of Expenses, Indemnitee shall have the right to commence a Proceeding
before a court of competent jurisdiction to challenge such Adverse Determination and/or to require the Company to make such payments or advances. Indemnitee shall be entitled to be indemnified for all Expenses incurred in connection with such a
Proceeding in accordance with Section 3(b) and to have such Expenses advanced by the Company in accordance with Section 4. If Indemnitee fails to timely challenge an Adverse Determination, or if Indemnitee challenges an Adverse
Determination and such Adverse Determination has been upheld by a final judgment of a court of competent jurisdiction from which no appeal can be taken, then, to the extent and only to the extent required by such Adverse Determination or final
judgment, the Company shall not be obligated to indemnify or advance Expenses to Indemnitee under this Agreement. 

(g)    Presumptions; Burden and Standard of Proof. In connection with any Determination, or any review of any
Determination, by any person, including a court: 
 (i)    It shall be a presumption that a Determination
is not required. 

  
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 (ii)    It shall be a presumption that Indemnitee has
met the applicable standard of conduct and that indemnification of Indemnitee is proper in the circumstances. 

(iii)    The burden of proof shall be on the Company to overcome the presumptions set forth in the
preceding clauses (i) and (ii), and each such presumption shall only be overcome if the Company establishes that there is no reasonable basis to support it. 

(iv)    The termination of any Proceeding by judgment, order, finding, settlement (whether with or without
court approval) or conviction, or upon a plea of nolo contendere, or its equivalent, shall not create a presumption that indemnification is not proper or that Indemnitee did not meet the applicable standard of conduct or that a court has
determined that indemnification is not permitted by this Agreement or otherwise. 
 (v)    Neither the
failure of any person or persons to have made a Determination nor an Adverse Determination by any person or persons shall be a defense to Indemnitee’s claim or create a presumption that Indemnitee did not meet the applicable standard of
conduct, and any Proceeding commenced by Indemnitee pursuant to Section 5 shall be de novo with respect to all determinations of fact and law. 
  

	 	6.	 Directors and Officers Liability Insurance. 

(a)    Maintenance of Insurance. So long as the Company or any of its subsidiaries maintains liability insurance for
any directors, officers, employees or agents of any such person, the Company shall ensure that Indemnitee is covered by such insurance in such a manner as to provide Indemnitee the same rights and benefits as are accorded to the most favorably
insured of the Company’s and its subsidiaries’ then current directors and officers. If at any date (i) such insurance ceases to cover acts and omissions occurring during all or any part of the period of Indemnitee’s
Corporate Status or (ii) neither the Company nor any of its subsidiaries maintains any such insurance, the Company shall ensure that Indemnitee is covered, with respect to acts and omissions prior to such date, for at least six years (or
such shorter period as is available on commercially reasonable terms) from such date, by other directors and officers liability insurance, in amounts and on terms (including the portion of the period of Indemnitee’s Corporate Status covered) no
less favorable to Indemnitee than the amounts and terms of the liability insurance maintained by the Company on the date hereof. 

(b)    Notice to Insurers. Upon receipt of notice of a Proceeding pursuant to Section 5(a), the Company shall
give or cause to be given prompt notice of such Proceeding to all insurers providing liability insurance in accordance with the procedures set forth in all applicable or potentially applicable policies. The Company shall thereafter take all
necessary action to cause such insurers to pay all amounts payable in accordance with the terms of such policies. 
  

	 	7.	 Exculpation, etc. 

(a)    Limitation of Liability. Indemnitee shall not be personally liable to the Company or any of its subsidiaries
or to the stockholders of the Company or any such subsidiary 

  
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for monetary damages for breach of fiduciary duty as a director of the Company or any such subsidiary; provided, however, that the foregoing shall not eliminate or limit the
liability of the Indemnitee (i) for any breach of the Indemnitee’s duty of loyalty to the Company or such subsidiary or the stockholders thereof; (ii) for acts or omissions not in good faith or which involve intentional
misconduct or a knowing violation of the law; (iii) under Section 174 of the DGCL or any similar provision of other applicable corporations law; or (iv) for any transaction from which the Indemnitee derived an improper
personal benefit. If the DGCL or such other applicable law shall be amended to permit further elimination or limitation of the personal liability of directors, then the liability of the Indemnitee shall, automatically, without any further
action, be eliminated or limited to the fullest extent permitted by the DGCL or such other applicable law as so amended. 

(b)    Period of Limitations. No legal action shall be brought and no cause of action shall be asserted by or in the
right of the Company or any of its subsidiaries against Indemnitee or Indemnitee’s estate, spouses, heirs, executors, personal or legal representatives, administrators or assigns after the expiration of two years from the date of accrual of
such cause of action, and any claim or cause of action of the Company shall be extinguished and deemed released unless asserted by the timely filing of a legal action within such two-year period,
provided that if any shorter period of limitations is otherwise applicable to any such cause of action, such shorter period shall govern. 
  

	 	8.	 Miscellaneous. 

(a)    Non-Circumvention. The Company shall not seek or agree to any order
of any court or other governmental authority that would prohibit or otherwise interfere, and shall not take or fail to take any other action if such action or failure would reasonably be expected to have the effect of prohibiting or otherwise
interfering, with the performance of the Company’s indemnification, advancement or other obligations under this Agreement. 

(b)    Severability. If any provision or provisions of this Agreement shall be held to be invalid, illegal or
unenforceable for any reason whatsoever: (i) the validity, legality and enforceability of the remaining provisions of this Agreement (including without limitation, each portion of any section of this Agreement containing any
such provision held to be invalid, illegal or unenforceable, that is not itself invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby and shall remain enforceable to the fullest extent permitted by law;
(ii) such provision or provisions shall be deemed reformed to the extent necessary to conform to applicable law and to give the maximum effect to the intent of the parties hereto; and (iii) to the fullest extent possible, the
provisions of this Agreement (including, without limitation, each portion of any section of this Agreement containing any such provision held to be invalid, illegal or unenforceable, that is not itself invalid, illegal or unenforceable) shall be
construed so as to give effect to the intent manifested thereby. 
 (c)    Notices. All notices, requests, demands
and other communications under this Agreement shall be in writing and shall be deemed duly given (i) on the date of delivery if delivered personally, or by facsimile, upon confirmation of receipt, (ii) on the first business
day following the date of dispatch if delivered by a recognized next-day courier service or (iii) on the third business day following the date of mailing if delivered by domestic registered or
certified 

  
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mail, properly addressed, or on the fifth business day following the date of mailing if sent by airmail from a country outside of North America, to Indemnitee at the address shown on the
signature page of this Agreement, to the Company at the address shown on the signature page of this Agreement, or in either case as subsequently modified by written notice. 

(d)    Amendment and Termination. No amendment, modification, termination or cancellation of this Agreement shall be
effective unless it is in writing signed by all the parties hereto. No waiver of any of the provisions of this Agreement shall be deemed or shall constitute a waiver of any other provisions hereof (whether or not similar), nor shall such waiver
constitute a continuing waiver. 
 (e)    Successors and Assigns. This Agreement shall be binding upon the Company
and its respective successors and assigns, including without limitation any acquiror of all or substantially all of the Company’s assets or business, any person (as such term is used in Sections 13(d) and 14(d) of the Exchange Act)
that acquires beneficial ownership of securities of the Company representing more than 20% of the total voting power represented by the Company’s then outstanding Voting Securities and any survivor of any merger or consolidation to which the
Company is party, and shall inure to the benefit of and be enforceable by Indemnitee and Indemnitee’s estate, spouses, heirs, executors, personal or legal representatives, administrators and assigns. The Company shall require and cause any
such successor, by written agreement in form and substance satisfactory to Indemnitee, expressly to assume and agree to perform this Agreement as if it were named as the Company herein, and the Company shall not permit any such purchase of assets or
business, acquisition of securities or merger or consolidation to occur until such written agreement has been executed and delivered. No such assumption and agreement shall relieve the Company of any of its obligations hereunder, and this
Agreement shall not otherwise be assignable by the Company. This Agreement is personal in nature and neither of the parties hereto shall, without the consent of the other, assign or delegate this Agreement or any rights or obligations. Without
limiting the generality or effect of the foregoing, Indemnitee’s right to receive payments hereunder shall not be assignable, whether by pledge, creation of a security interest or otherwise, other than by a transfer by the
Indemnitee’s will or by estate law, and, in the event of any attempted assignment or transfer contrary to this Section 8(e), the Company shall have no liability to pay any amount so attempted to be assigned or transferred. 

(f)    Choice of Law; Consent to Jurisdiction. This Agreement shall be governed by and its provisions construed in
accordance with the laws of the State of Delaware, as applied to contracts between Delaware residents entered into and to be performed entirely within Delaware, without regard to the conflict of law principles thereof. The Company and
Indemnitee each hereby irrevocably consents to the jurisdiction of the courts of the State of Delaware for all purposes in connection with any Proceeding which arises out of or relates to this Agreement and agree that any action instituted under
this Agreement shall be brought only in the state courts of the State of Delaware. 
 (g)    Integration and Entire
Agreement. This Agreement sets forth the entire understanding between the parties hereto and supersedes and merges all previous written and oral negotiations, commitments, understandings and agreements relating to the subject matter hereof
between the parties hereto, provided that the provisions hereof shall not supersede the 

  
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provisions of the Company’s certificate of incorporation, bylaws or other organizational agreement or instrument, any other agreement, any vote of stockholders or directors, the DGCL or
other applicable law, to the extent any such provisions shall be more favorable to Indemnitee than the provisions hereof. 

(h)    Counterparts. This Agreement may be executed in one or more counterparts, each of which shall constitute an
original. 
 [Remainder of this page intentionally left blank] 

  
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 IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first
above written. 
  

			
	NEXIMMUNE, INC.
		
	By:	 	 
	Name:	 	
	Title:	 	

  

	
	AGREED TO AND ACCEPTED:
	
	INDEMNITEE:
	
	   

	Name:
	Title:
	
	Address:

  
 12EX-10.2.1

 Exhibit 10.2.1 

NEXIMMUNE, INC. 

2017 EQUITY INCENTIVE PLAN 

1. GENERAL. 
 (a)
Eligible Stock Award Recipients. The persons eligible to receive Stock Awards are Employees, Directors and Consultants. 
 (b)
Available Stock Awards. The Plan provides for the grant of the following Stock Awards: (i) Incentive Stock Options, (ii) Nonstatutory Stock Options, (iii) Restricted Stock Awards, (iv) Restricted Stock Unit Awards, and
(v) Stock Appreciation Rights. 
 (c) Purpose. The Company, by means of the Plan, seeks to secure and retain the services of the
group of persons eligible to receive Stock Awards as set forth in Section 1(a), to provide incentives for such persons to exert maximum efforts for the success of the Company and any Affiliate, and to provide a means by which such eligible
recipients may be given an opportunity to benefit from increases in value of the Common Stock through the granting of Stock Awards. 
 2.
ADMINISTRATION. 
 (a) Administration by Board. The Board will administer the Plan unless and until the Board
delegates administration of the Plan to a Committee, as provided in Section 2(c). 
 (b) Powers of Board. The Board will have the
power, subject to, and within the limitations of, the express provisions of the Plan: 
 (i) To determine from time to time
(A) which of the persons eligible under the Plan will be granted Stock Awards; (B) when and how each Stock Award will be granted; (C) what type or combination of types of Stock Award will be granted; (D) the provisions of each
Stock Award granted (which need not be identical), including the time or times when a person will be permitted to receive cash or Common Stock pursuant to a Stock Award; (E) the number of shares of Common Stock with respect to which a Stock
Award will be granted to each such person; and (F) the Fair Market Value applicable to a Stock Award. 
 (ii) To construe and
interpret the Plan and Stock Awards granted under it, and to establish, amend and revoke rules and regulations for administration of the Plan. The Board, in the exercise of this power, may correct any defect, omission or inconsistency in the Plan or
in any Stock Award Agreement, in a manner and to the extent it will deem necessary or expedient to make the Plan or Stock Award fully effective. 

  
 1. 

 (iii) To settle all controversies regarding the Plan and Stock Awards granted under
it. 
 (iv) To accelerate the time at which a Stock Award may first be exercised or the time during which a Stock Award or any part
thereof will vest in accordance with the Plan, notwithstanding the provisions in the Stock Award stating the time at which it may first be exercised or the time during which it will vest. 

(v) To suspend or terminate the Plan at any time. Suspension or termination of the Plan will not impair rights and obligations under any
Stock Award granted while the Plan is in effect except with the written consent of the affected Participant. 
 (vi) To amend the Plan
in any respect the Board deems necessary or advisable, including, without limitation, relating to Incentive Stock Options and certain nonqualified deferred compensation under Section 409A of the Code and/or to bring the Plan or Stock Awards
granted under the Plan into compliance therewith, subject to the limitations, if any, of applicable law. However, except as provided in Section 9(a) relating to Capitalization Adjustments, to the extent required by applicable law, stockholder
approval will be required for any amendment of the Plan that either (i) materially increases the number of shares of Common Stock available for issuance under the Plan, (ii) materially expands the class of individuals eligible to receive
Stock Awards under the Plan, (iii) materially increases the benefits accruing to Participants under the Plan or materially reduces the price at which shares of Common Stock may be issued or purchased under the Plan, (iv) materially extends
the term of the Plan, or (v) expands the types of Stock Awards available for issuance under the Plan. Except as provided above, rights under any Stock Award granted before amendment of the Plan will not be impaired by any amendment of the Plan
unless (i) the Company requests the consent of the affected Participant, and (ii) such Participant consents in writing.  

(vii) To submit any amendment to the Plan for stockholder approval, including, but not limited to, amendments to the Plan intended to
satisfy the requirements of Section 422 of the Code regarding Incentive Stock Options. 
 (viii) To approve forms of Stock Award
Agreements for use under the Plan and to amend the terms of any one or more Stock Awards, including, but not limited to, amendments to provide terms more favorable than previously provided in the Stock Award Agreement, subject to any specified
limits in the Plan that are not subject to Board discretion; provided however, that, the rights under any Stock Award will not be impaired by any such amendment unless (i) the Company requests the consent of the affected Participant, and
(ii) such Participant consents in writing. Notwithstanding the foregoing, subject to the limitations of applicable law, if any, and without the affected Participant’s consent, the Board may amend the terms of any one or more Stock Awards
if necessary to maintain the qualified status of the Stock Award as an Incentive Stock Option or to bring the Stock Award into compliance with Section 409A of the Code and the related guidance thereunder. 

(ix) Generally, to exercise such powers and to perform such acts as the Board deems necessary or expedient to promote the best interests
of the Company and that are not in conflict with the provisions of the Plan or Stock Awards. 

  
 2. 

 (x) To adopt such procedures and sub-plans as
are necessary or appropriate to permit participation in the Plan by Employees, Directors or Consultants who are foreign nationals or employed outside the United States. 

(xi) To effect, at any time and from time to time, with the consent of any adversely affected Optionholder, (1) the reduction of
the exercise price of any outstanding Option under the Plan, (2) the cancellation of any outstanding Option under the Plan and the grant in substitution therefor of (A) a new Option under the Plan or another equity plan of the Company
covering the same or a different number of shares of Common Stock, (B) a Restricted Stock Award, (C) a Stock Appreciation Right, (D) Restricted Stock Unit, (E) cash and/or (F) other valuable consideration (as determined by
the Board, in its sole discretion), or (3) any other action that is treated as a repricing under generally accepted accounting principles; provided, however, that no such reduction or cancellation may be effected if it is determined, in
the Company’s sole discretion, that such reduction or cancellation would result in any such outstanding Option becoming subject to the requirements of Section 409A of the Code. 

(c) Delegation to Committee. The Board may delegate some or all of the administration of the Plan to a Committee or Committees. If
administration of the Plan is delegated to a Committee, the Committee will have, in connection with the administration of the Plan, the powers theretofore possessed by the Board that have been delegated to the Committee, including the power to
delegate to a subcommittee of the Committee any of the administrative powers the Committee is authorized to exercise (and references in this Plan to the Board will thereafter be to the Committee or subcommittee), subject, however, to such
resolutions, not inconsistent with the provisions of the Plan, as may be adopted from time to time by the Board. The Board may retain the authority to concurrently administer the Plan with the Committee and may, at any time, revest in the Board some
or all of the powers previously delegated.  
 (d) Delegation to an Officer. The Board may delegate to one or more Officers of
the Company the authority to do one or both of the following: (i) designate Officers and Employees of the Company or any of its Subsidiaries to be recipients of Options (and, to the extent permitted by applicable law, other Stock Awards) and
the terms thereof, and (ii) determine the number of shares of Common Stock to be subject to such Stock Awards granted to such Officers and Employees; provided, however, that the Board resolutions regarding such delegation will specify
the total number of shares of Common Stock that may be subject to the Stock Awards granted by such Officer and that such Officer may not grant a Stock Award to himself or herself. Notwithstanding the foregoing, the Board may not delegate authority
to an Officer to determine the Fair Market Value of the Common Stock pursuant to Section 13(t) below. 
 (e) Effect of Board’s
Decision. All determinations, interpretations and constructions made by the Board in good faith will not be subject to review by any person and will be final, binding and conclusive on all persons. 

3. SHARES SUBJECT TO THE PLAN. 

(a) Share Reserve. Subject to Section 9(a) relating to Capitalization Adjustments, the aggregate number of shares of Common Stock
of the Company that may be issued pursuant to Stock Awards after the Effective Date will not exceed 8,358,265 shares. For clarity, the limitation in this Section 3(a) is a limitation in the number of shares of Common Stock that may be issued
pursuant to the Plan. Accordingly, this Section 3(a) does not limit the granting of Stock Awards except as provided in Section 7(a). 

  
 3. 

 (b) Reversion of Shares to the Share Reserve. If any shares of Common Stock issued
pursuant to a Stock Award are forfeited back to the Company because of the failure to meet a contingency or condition required to vest such shares in the Participant, then the shares which are forfeited will revert to and again become available for
issuance under the Plan. Also, any shares reacquired by the Company pursuant to Section 8(g) or as consideration for the exercise of an Option will again become available for issuance under the Plan. Furthermore, if a Stock Award
(i) expires or otherwise terminates without having been exercised in full or (ii) is settled in cash (i.e., the holder of the Stock Award receives cash rather than stock), such expiration, termination or settlement will not reduce
(or otherwise offset) the number of shares of Common Stock that may be issued pursuant to the Plan. Notwithstanding the provisions of this Section 3(b), any such shares will not be subsequently issued pursuant to the exercise of Incentive Stock
Options. 
 (c) Incentive Stock Option Limit. Notwithstanding anything to the contrary in this Section 3(c), subject to the
provisions of Section 9(a) relating to Capitalization Adjustments, the aggregate maximum number of shares of Common Stock that may be issued pursuant to the exercise of Incentive Stock Options will be 8,358,265 shares of Common
Stock.  
 (d) Source of Shares. The stock issuable under the Plan will be shares of authorized but unissued or
reacquired Common Stock, including shares repurchased by the Company on the open market. 
 4. ELIGIBILITY. 

(a) Eligibility for Specific Stock Awards. Incentive Stock Options may be granted only to employees of the Company or a “parent
corporation” or “subsidiary corporation” thereof (as such terms are defined in Sections 424(e) and (f) of the Code). Stock Awards other than Incentive Stock Options may be granted to Employees, Directors and Consultants. 

(b) Ten Percent Stockholders. A Ten Percent Stockholder will not be granted an Incentive Stock Option unless the exercise price of such
Option is at least one hundred ten percent (110%) of the Fair Market Value of the Common Stock on the date of grant and the Option is not exercisable after the expiration of five (5) years from the date of grant. 

(c) Consultants. A Consultant will not be eligible for the grant of a Stock Award if, at the time of grant, either the offer or
the sale of the Company’s securities to such Consultant is not exempt under Rule 701 of the Securities Act (“Rule 701”) because of the nature of the services that the Consultant is providing to the Company, because the
Consultant is not a natural person, or because of any other provision of Rule 701, unless the Company determines that such grant need not comply with the requirements of Rule 701 and will satisfy another exemption under the Securities Act as well as
comply with the securities laws of all other relevant jurisdictions. 

  
 4. 

 5. OPTION PROVISIONS. 

Each Option will be in such form and will contain such terms and conditions as the Board will deem appropriate. All Options will be separately
designated Incentive Stock Options or Nonstatutory Stock Options at the time of grant, and, if certificates are issued, a separate certificate or certificates will be issued for shares of Common Stock purchased on exercise of each type of Option. If
an Option is not specifically designated as an Incentive Stock Option, then the Option will be a Nonstatutory Stock Option. The provisions of separate Options need not be identical; provided, however, that each Option Agreement will include
(through incorporation of provisions hereof by reference in the Option Agreement or otherwise) the substance of each of the following provisions: 

(a) Term. Subject to the provisions of Section 4(b) regarding Ten Percent Stockholders, no Option will be exercisable after the
expiration of ten (10) years from the date of its grant or such shorter period specified in the Option Agreement. 
 (b) Exercise
Price. Subject to the provisions of Section 4(b) regarding Incentive Stock Options granted to Ten Percent Stockholders, the exercise price of each Option will be not less than one hundred percent (100%) of the Fair Market Value of the
Common Stock subject to the Option on the date the Option is granted. Notwithstanding the foregoing, an Option may be granted with an exercise price lower than one hundred percent (100%) of the Fair Market Value of the Common Stock subject to the
Option if such Option is granted pursuant to an assumption or substitution for another option in a manner consistent with the provisions of Section 424(a) of the Code (whether or not such options are Incentive Stock Options). 

(c) Consideration. The purchase price of Common Stock acquired pursuant to the exercise of an Option will be paid, to the extent
permitted by applicable law and as determined by the Board in its sole discretion, by any combination of the methods of payment set forth below. The Board will have the authority to grant Options that do not permit all of the following methods of
payment (or otherwise restrict the ability to use certain methods) and to grant Options that require the consent of the Company to utilize a particular method of payment. The permitted methods of payment are as follows: 

(i) by cash, check, bank draft or money order payable to the Company; 

(ii) pursuant to a program developed under Regulation T as promulgated by the Federal Reserve Board that, prior to the issuance of the
stock subject to the Option, results in either the receipt of cash (or check) by the Company or the receipt of irrevocable instructions to pay the aggregate exercise price to the Company from the sales proceeds; 

(iii) by delivery to the Company (either by actual delivery or attestation) of shares of Common Stock; 

(iv) by a “net exercise” arrangement pursuant to which the Company will reduce the number of shares of Common Stock issued
upon exercise by the largest whole number of shares with a Fair Market Value that does not exceed the aggregate exercise price; provided, however, that the Company will accept a cash or other payment from the Participant to the extent of any
remaining balance of the aggregate exercise price not satisfied by such 

  
 5. 

 reduction in the number of whole shares to be issued; provided, further, that shares of Common Stock
will no longer be outstanding under an Option and will not be exercisable thereafter to the extent that (A) shares are used to pay the exercise price pursuant to the “net exercise,” (B) shares are delivered to the Participant as a
result of such exercise, and (C) shares are withheld to satisfy tax withholding obligations; 
 (v) according to a deferred
payment or similar arrangement with the Optionholder; provided, however, that interest will compound at least annually and will be charged at the minimum rate of interest necessary to avoid (A) the imputation of interest income to the
Company and compensation income to the Optionholder under any applicable provisions of the Code, and (B) the classification of the Option as a liability for financial accounting purposes; or 

(vi) in any other form of legal consideration that may be acceptable to the Board. 

(d) Transferability of Options. The Board may, in its sole discretion, impose such limitations on the transferability of Options as the
Board will determine. In the absence of such a determination by the Board to the contrary, the following restrictions on the transferability of Options will apply: 

(i) Restrictions on Transfer. An Option will not be transferable except by will or by the laws of descent and distribution and will be
exercisable during the lifetime of the Optionholder only by the Optionholder; provided, however, that the Board may, in its sole discretion, permit transfer of the Option to such extent as permitted by Rule 701 of the Securities Act at the
time of the grant of the Option and in a manner consistent with applicable tax and securities laws upon the Optionholder’s request. 

(ii) Domestic Relations Orders. Notwithstanding the foregoing, an Option may be transferred pursuant to a domestic relations order,
provided, however, that an Incentive Stock Option may be deemed to be a Nonstatutory Stock Option as a result of such transfer. 

(iii) Beneficiary Designation. Notwithstanding the foregoing, the Optionholder may, by delivering written notice to the Company, in a
form provided by or otherwise satisfactory to the Company, designate a third party who, in the event of the death of the Optionholder, will thereafter be the beneficiary of an Option with the right to exercise the Option and receive the Common Stock
or other consideration resulting from the Option exercise. 
 (e) Vesting of Options Generally. The total number of shares of Common
Stock subject to an Option may vest and therefore become exercisable in periodic installments that may or may not be equal. The Option may be subject to such other terms and conditions on the time or times when it may or may not be exercised (which
may be based on the satisfaction of performance goals or other criteria) as the Board may deem appropriate. The vesting provisions of individual Options may vary. The provisions of this Section 5(e) are subject to any Option provisions
governing the minimum number of shares of Common Stock as to which an Option may be exercised. 

  
 6. 

 (f) Termination of Continuous Service. Except as otherwise provided in the applicable
Option Agreement or other agreement between the Optionholder and the Company, in the event that an Optionholder’s Continuous Service terminates (other than for Cause or upon the Optionholder’s death or Disability), the Optionholder may
exercise his or her Option (to the extent that the Optionholder was entitled to exercise such Option as of the date of termination of Continuous Service) but only within such period of time ending on the earlier of (i) the date three (3) months
following the termination of the Optionholder’s Continuous Service (or such longer or shorter period specified in the Option Agreement, which period will not be less than thirty (30) days unless such termination is for Cause), or
(ii) the expiration of the term of the Option as set forth in the Option Agreement. If, after termination of Continuous Service, the Optionholder does not exercise his or her Option within the time specified in this Plan or in the Option
Agreement (as applicable), the Option will terminate. 
 (g) Extension of Termination Date. Except as otherwise provided in the
applicable Option Agreement or other agreement between the Optionholder and the Company, if the exercise of the Option following the termination of the Optionholder’s Continuous Service (other than for Cause or upon the Optionholder’s
death or Disability) would be prohibited at any time solely because the issuance of shares of Common Stock would violate the registration requirements under the Securities Act, then the Option will terminate on the earlier of (i) the expiration
of a period of three (3) months after the termination of the Optionholder’s Continuous Service during which the exercise of the Option would not be in violation of such registration requirements, or (ii) the expiration of the term of
the Option as set forth in the Option Agreement. 
 (h) Disability of Optionholder. Except as otherwise provided in the applicable
Option Agreement or other agreement between the Optionholder and the Company, in the event that an Optionholder’s Continuous Service terminates as a result of the Optionholder’s Disability, the Optionholder may exercise his or her Option
(to the extent that the Optionholder was entitled to exercise such Option as of the date of termination of Continuous Service), but only within such period of time ending on the earlier of (i) the date twelve (12) months following such
termination of Continuous Service (or such longer or shorter period specified in the Option Agreement, which period will not be less than six (6) months), or (ii) the expiration of the term of the Option as set forth in the Option
Agreement. If, after termination of Continuous Service, the Optionholder does not exercise his or her Option within the time specified in this Plan or in the Option Agreement (as applicable), the Option will terminate. 

(i) Death of Optionholder. Except as otherwise provided in the applicable Option Agreement or other agreement between the Optionholder
and the Company, in the event that (i) an Optionholder’s Continuous Service terminates as a result of the Optionholder’s death, or (ii) the Optionholder dies within the period (if any) specified in the Option Agreement after the
termination of the Optionholder’s Continuous Service for a reason other than death, then the Option may be exercised (to the extent the Optionholder was entitled to exercise such Option as of the date of death) by the Optionholder’s
estate, by a person who acquired the right to exercise the Option by bequest or inheritance or by a person designated as the beneficiary of the Option upon the Optionholder’s death, but only within the period ending on the earlier of
(i) the date eighteen (18) months following the date of death (or such longer or shorter period specified in the Option Agreement, which period will not be less than six (6) months), or (ii) the expiration of 

  
 7. 

 the term of such Option as set forth in the Option Agreement. If, after the Optionholder’s death, the
Option is not exercised within the time specified in this Plan or in the Option Agreement (as applicable), the Option will terminate. If the Optionholder designates a third party beneficiary of the Option in accordance with Section 5(d)(iii),
then upon the death of the Optionholder such designated beneficiary will have the sole right to exercise the Option and receive the Common Stock or other consideration resulting from the Option exercise. 

(j) Termination for Cause. Except as explicitly provided otherwise in an Optionholder’s Option Agreement, in the event that an
Optionholder’s Continuous Service is terminated for Cause, the Option will terminate upon the termination date of such Optionholder’s Continuous Service, and the Optionholder will be prohibited from exercising his or her Option from and
after the time of such termination of Continuous Service.  
 (k) Non-Exempt Employees.
No Option granted to an Employee that is a non-exempt employee for purposes of the Fair Labor Standards Act of 1938, as amended, will be first exercisable for any shares of Common Stock until at least six
months following the date of grant of the Option. The foregoing provision is intended to operate so that any income derived by a non-exempt employee in connection with the exercise or vesting of an Option will
be exempt from his or her regular rate of pay. 
 (l) Early Exercise. The Option may, but need not, include a provision whereby the
Optionholder may elect at any time before the Optionholder’s Continuous Service terminates to exercise the Option as to any part or all of the shares of Common Stock subject to the Option prior to the full vesting of the Option. Subject to the
“Repurchase Limitation” in Section 8(l), any unvested shares of Common Stock so purchased may be subject to a repurchase option in favor of the Company or to any other restriction the Board determines to be appropriate. Provided that
the “Repurchase Limitation” in Section 8(l) is not violated, the Company will not be required to exercise its repurchase option until at least six (6) months (or such longer or shorter period of time required to avoid
classification of the Option as a liability for financial accounting purposes) have elapsed following exercise of the Option unless the Board otherwise specifically provides in the Option Agreement.  

(m) Right of Repurchase. Subject to the “Repurchase Limitation” in Section 8(l), the Option may include a provision
whereby the Company may elect to repurchase all or any part of the vested shares of Common Stock acquired by the Optionholder pursuant to the exercise of the Option. 

(n) Right of First Refusal. The Option may include a provision whereby the Company may elect to exercise a right of first refusal
following receipt of notice from the Optionholder of the intent to transfer all or any part of the shares of Common Stock received upon the exercise of the Option. Such right of first refusal will be subject to the “Repurchase Limitation”
in Section 8(l). Except as expressly provided in this Section 5(n) or in the Option Agreement, such right of first refusal will otherwise comply with any applicable provisions of the Bylaws of the Company. 

  
 8. 

 6. PROVISIONS OF STOCK AWARDS
OTHER THAN OPTIONS. 
 (a) Restricted Stock Awards. Each Restricted Stock Award
Agreement will be in such form and will contain such terms and conditions as the Board will deem appropriate. To the extent consistent with the Company’s Bylaws, at the Board’s election, shares of Common Stock may be (x) held in book
entry form subject to the Company’s instructions until any restrictions relating to the Restricted Stock Award lapse; or (y) evidenced by a certificate, which certificate will be held in such form and manner as determined by the Board. The
terms and conditions of Restricted Stock Award Agreements may change from time to time, and the terms and conditions of separate Restricted Stock Award Agreements need not be identical; provided, however, that each Restricted Stock Award
Agreement will include (through incorporation of the provisions hereof by reference in the agreement or otherwise) the substance of each of the following provisions: 

(i) Consideration. A Restricted Stock Award may be awarded in consideration for (A) past or future services actually or to be
rendered to the Company or an Affiliate, or (B) any other form of legal consideration that may be acceptable to the Board in its sole discretion and permissible under applicable law. 

(ii) Vesting. Subject to the “Repurchase Limitation” in Section 8(l), shares of Common Stock awarded under the Restricted
Stock Award Agreement may be subject to forfeiture to the Company in accordance with a vesting schedule to be determined by the Board. 

(iii) Termination of Participant’s Continuous Service. In the event a Participant’s Continuous Service terminates, the Company
may receive via a forfeiture condition, any or all of the shares of Common Stock held by the Participant which have not vested as of the date of termination of Continuous Service under the terms of the Restricted Stock Award Agreement. 

(iv) Transferability. Rights to acquire shares of Common Stock under the Restricted Stock Award Agreement will be transferable by the
Participant only upon such terms and conditions as are set forth in the Restricted Stock Award Agreement, as the Board will determine in its sole discretion, so long as Common Stock awarded under the Restricted Stock Award Agreement remains subject
to the terms of the Restricted Stock Award Agreement. 
 (b) Restricted Stock Unit Awards. Each Restricted Stock Unit Award Agreement
will be in such form and will contain such terms and conditions as the Board will deem appropriate. The terms and conditions of Restricted Stock Unit Award Agreements may change from time to time, and the terms and conditions of separate Restricted
Stock Unit Award Agreements need not be identical, provided, however, that each Restricted Stock Unit Award Agreement will include (through incorporation of the provisions hereof by reference in the Agreement or otherwise) the substance of
each of the following provisions:  
 (i) Consideration. At the time of grant of a Restricted Stock Unit Award, the Board will
determine the consideration, if any, to be paid by the Participant upon delivery of each share of Common Stock subject to the Restricted Stock Unit Award. The consideration to be paid (if any) by the Participant for each share of Common Stock
subject to a Restricted Stock Unit Award may be paid in any form of legal consideration that may be acceptable to the Board in its sole discretion and permissible under applicable law. 

  
 9. 

 (ii) Vesting. At the time of the grant of a Restricted Stock Unit Award, the Board
may impose such restrictions or conditions to the vesting of the Restricted Stock Unit Award as it, in its sole discretion, deems appropriate. 

(iii) Payment. A Restricted Stock Unit Award may be settled by the delivery of shares of Common Stock, their cash equivalent, any
combination thereof or in any other form of consideration, as determined by the Board and contained in the Restricted Stock Unit Award Agreement. 

(iv) Additional Restrictions. At the time of the grant of a Restricted Stock Unit Award, the Board, as it deems appropriate, may impose
such restrictions or conditions that delay the delivery of the shares of Common Stock (or their cash equivalent) subject to a Restricted Stock Unit Award to a time after the vesting of such Restricted Stock Unit Award. 

(v) Dividend Equivalents. Dividend equivalents may be credited in respect of shares of Common Stock covered by a Restricted Stock Unit
Award, as determined by the Board and contained in the Restricted Stock Unit Award Agreement. At the sole discretion of the Board, such dividend equivalents may be converted into additional shares of Common Stock covered by the Restricted Stock Unit
Award in such manner as determined by the Board. Any additional shares covered by the Restricted Stock Unit Award credited by reason of such dividend equivalents will be subject to all the terms and conditions of the underlying Restricted Stock Unit
Award Agreement to which they relate. 
 (vi) Termination of Participant’s Continuous Service. Except as otherwise provided in
the applicable Restricted Stock Unit Award Agreement, such portion of the Restricted Stock Unit Award that has not vested will be forfeited upon the Participant’s termination of Continuous Service.  

(vii) Compliance with Section 409A of the Code. Notwithstanding anything to the contrary set forth in this Plan, any
Restricted Stock Unit Award granted under the Plan that is not exempt from the requirements of Section 409A of the Code will contain such provisions so that such Restricted Stock Unit Award will comply with the requirements of Section 409A
of the Code. Such restrictions, if any, will be determined by the Board and contained in the Restricted Stock Unit Award Agreement evidencing such Restricted Stock Unit Award. For example, such restrictions may include, without limitation, a
requirement that any Common Stock that is to be issued in a year following the year in which the Restricted Stock Unit Award vests must be issued in accordance with a fixed pre-determined schedule. 

(c) Stock Appreciation Rights. Each Stock Appreciation Right Agreement will be in such form and will contain such terms and conditions
as the Board will deem appropriate. Stock Appreciation Rights may be granted as stand-alone Stock Awards or in tandem with other Stock Awards. The terms and conditions of Stock Appreciation Right Agreements may change from time to time, and the
terms and conditions of separate Stock Appreciation Right Agreements need not be identical; provided, however, that each Stock Appreciation Right Agreement will include (through incorporation of the provisions hereof by reference in the
agreement or otherwise) the substance of each of the following provisions:  

  
 10. 

 (i) Term. No Stock Appreciation Right will be exercisable after the expiration of ten
(10) years from the date of grant or such shorter period specified in the Stock Appreciation Right Agreement. 
 (ii) Strike Price.
Each Stock Appreciation Right will be denominated in shares of Common Stock equivalents. The strike price of each Stock Appreciation Right granted as a stand-alone or tandem Stock Award will not be less than one hundred percent (100%) of the
Fair Market Value of the Common Stock equivalents subject to the Stock Appreciation Right on the date of grant. 
 (iii) Calculation of
Appreciation. The appreciation distribution payable on the exercise of a Stock Appreciation Right will be not greater than an amount equal to the excess of (A) the aggregate Fair Market Value (on the date of the exercise of the Stock
Appreciation Right) of a number of shares of Common Stock equal to the number of shares of Common Stock equivalents in which the Participant is vested under such Stock Appreciation Right, and with respect to which the Participant is exercising the
Stock Appreciation Right on such date, over (B) the strike price that will be determined by the Board on the date of grant. 
 (iv)
Vesting. At the time of the grant of a Stock Appreciation Right, the Board may impose such restrictions or conditions to the vesting of such Stock Appreciation Right as it, in its sole discretion, deems appropriate. 

(v) Exercise. To exercise any outstanding Stock Appreciation Right, the Participant must provide written notice of exercise to the
Company in compliance with the provisions of the Stock Appreciation Right Agreement evidencing such Stock Appreciation Right. 
 (vi) Non-Exempt Employees. No Stock Appreciation Right granted to an Employee that is a non-exempt employee for purposes of the Fair Labor Standards Act of 1938, as amended,
will be first exercisable for any shares of Common Stock until at least six months following the date of grant of the Stock Appreciation Right. The foregoing provision is intended to operate so that any income derived by a non-exempt employee in connection with the exercise of a Stock Appreciation Right will be exempt from his or her regular rate of pay. 

(vii) Payment. The appreciation distribution in respect to a Stock Appreciation Right may be paid in Common Stock, in cash, in any
combination of the two or in any other form of consideration, as determined by the Board and contained in the Stock Appreciation Right Agreement evidencing such Stock Appreciation Right. 

(viii) Termination of Continuous Service. Except as otherwise provided in the applicable Stock Appreciation Right Agreement or other
agreement between the Participant and the Company, in the event that a Participant’s Continuous Service terminates (other than for Cause or upon the Participant’s death or Disability), the Participant may exercise his or her Stock
Appreciation Right (to the extent that the Participant was entitled to exercise such Stock Appreciation Right as of the date of termination of Continuous Service) but only within such 

  
 11. 

 
period of time ending on the earlier of (A) the date three (3) months following the termination of the Participant’s Continuous Service (or such longer or shorter period specified
in the Stock Appreciation Right Agreement, which period will not be less than thirty (30) days unless such termination is for Cause), or (B) the expiration of the term of the Stock Appreciation Right as set forth in the Stock Appreciation
Right Agreement. If, after termination of Continuous Service, the Participant does not exercise his or her Stock Appreciation Right within the time specified in this Plan or in the Stock Appreciation Right Agreement (as applicable), the Stock
Appreciation Right will terminate. 
 (ix) Disability of Participant. Except as otherwise provided in the applicable Stock
Appreciation Right Agreement or other agreement between the Participant and the Company, in the event that a Participant’s Continuous Service terminates as a result of the Participant’s Disability, the Participant may exercise his or her
Stock Appreciation Right (to the extent that the Participant was entitled to exercise such Stock Appreciation Right as of the date of termination of Continuous Service), but only within such period of time ending on the earlier of (A) the date
twelve (12) months following such termination of Continuous Service (or such longer or shorter period specified in the Stock Appreciation Right Agreement, which period will not be less than six (6) months), or (B) the expiration of
the term of the Stock Appreciation Right as set forth in the Stock Appreciation Right Agreement. If, after termination of Continuous Service, the Participant does not exercise his or her Stock Appreciation Right within the time specified in this
Plan or in the Stock Appreciation Right Agreement (as applicable), the Stock Appreciation Right will terminate. 
 (x) Death of
Participant. Except as otherwise provided in the applicable Stock Appreciation Right Agreement or other agreement between the Participant and the Company, in the event that (i) a Participant’s Continuous Service terminates as a result
of the Participant’s death, or (ii) the Participant dies within the period (if any) specified in the Stock Appreciation Right Agreement after the termination of the Participant’s Continuous Service for a reason other than death, then
the Stock Appreciation Right may be exercised (to the extent the Participant was entitled to exercise such Stock Appreciation Right as of the date of death) by the Participant’s estate, by a person who acquired the right to exercise the Stock
Appreciation Right by bequest or inheritance or by a person designated as the beneficiary of the Stock Appreciation Right upon the Participant’s death, but only within the period ending on the earlier of (i) the date eighteen
(18) months following the date of death (or such longer or shorter period specified in the Stock Appreciation Right Agreement, which period will not be less than six (6) months), or (ii) the expiration of the term of such Stock
Appreciation Right as set forth in the Stock Appreciation Right Agreement. If, after the Participant’s death, the Stock Appreciation Right is not exercised within the time specified in this Plan or in the Stock Appreciation Right Agreement (as
applicable), the Stock Appreciation Right will terminate.     
 (xi) Termination for Cause. Except as explicitly
provided otherwise in an Participant’s Stock Appreciation Right Agreement, in the event that a Participant’s Continuous Service is terminated for Cause, the Stock Appreciation Right will terminate upon the termination date of such
Participant’s Continuous Service, and the Participant will be prohibited from exercising his or her Stock Appreciation Right from and after the time of such termination of Continuous Service. 

  
 12. 

 (xii) Compliance with Section 409A of the
Code.    Notwithstanding anything to the contrary set forth in this Plan, any Stock Appreciation Rights granted under the Plan that are not exempt from the requirements of Section 409A of the Code will contain
such provisions so that such Stock Appreciation Rights will comply with the requirements of Section 409A of the Code. Such restrictions, if any, will be determined by the Board and contained in the Stock Appreciation Right Agreement evidencing
such Stock Appreciation Right. For example, such restrictions may include, without limitation, a requirement that a Stock Appreciation Right that is to be paid wholly or partly in cash must be exercised and paid in accordance with a fixed
predetermined schedule.  
 7. COVENANTS OF THE COMPANY. 

(a) Availability of Shares. During the terms of the Stock Awards, the Company will keep available at all times the number of shares of
Common Stock reasonably required to satisfy such Stock Awards. 
 (b) Securities Law Compliance. The Company will seek to obtain from
each regulatory commission or agency having jurisdiction over the Plan such authority as may be required to grant Stock Awards and to issue and sell shares of Common Stock upon exercise of the Stock Awards; provided, however, that this
undertaking will not require the Company to register under the Securities Act the Plan, any Stock Award or any Common Stock issued or issuable pursuant to any such Stock Award. If, after reasonable efforts, the Company is unable to obtain from any
such regulatory commission or agency the authority that counsel for the Company deems necessary for the lawful issuance and sale of Common Stock under the Plan, the Company will be relieved from any liability for failure to issue and sell Common
Stock upon exercise of such Stock Awards unless and until such authority is obtained. 
 (c) No Obligation to Notify. The Company will
have no duty or obligation to any holder of a Stock Award to advise such holder as to the time or manner of exercising such Stock Award. Furthermore, the Company will have no duty or obligation to warn or otherwise advise such holder of a pending
termination or expiration of a Stock Award or a possible period in which the Stock Award may not be exercised. The Company has no duty or obligation to minimize the tax consequences of a Stock Award to the holder of such Stock Award. 

8. MISCELLANEOUS. 
 (a)
Use of Proceeds from Sales of Common Stock. Proceeds from the sale of shares of Common Stock pursuant to Stock Awards will constitute general funds of the Company. 

(b) Corporate Action Constituting Grant of Stock Awards. Corporate action constituting a grant by the Company of a Stock Award to any
Participant will be deemed completed as of the date of such corporate action, unless otherwise determined by the Board, regardless of when the instrument, certificate, or letter evidencing the Stock Award is communicated to, or actually received or
accepted by, the Participant. 

  
 13. 

 (c) Stockholder Rights. No Participant will be deemed to be the holder of, or to have
any of the rights of a holder with respect to, any shares of Common Stock subject to such Stock Award unless and until such Participant has satisfied all requirements for exercise of the Stock Award pursuant to its terms and the Participant will not
be deemed to be a stockholder of record until the issuance of the Common Stock pursuant to such exercise has been entered into the books and records of the Company. Upon request by the Company, each Participant will execute any voting agreement,
stockholder agreement, right of first refusal and co-sale agreement or similar agreement among the stockholders of the Company. 

(d) No Employment or Other Service Rights. Nothing in the Plan, any Stock Award Agreement or any other instrument executed thereunder or
in connection with any Stock Award granted pursuant to the Plan will confer upon any Participant any right to continue to serve the Company or an Affiliate in the capacity in effect at the time the Stock Award was granted or will affect the right of
the Company or an Affiliate to terminate (i) the employment of an Employee with or without notice and with or without cause, (ii) the service of a Consultant pursuant to the terms of such Consultant’s agreement with the Company or an
Affiliate, or (iii) the service of a Director pursuant to the Bylaws of the Company or an Affiliate, and any applicable provisions of the corporate law of the state in which the Company or the Affiliate is incorporated, as the case may be. 

(e) Incentive Stock Option $100,000 Limitation. To the extent that the aggregate Fair Market Value (determined at the time of grant) of
Common Stock with respect to which Incentive Stock Options are exercisable for the first time by any Optionholder during any calendar year (under all plans of the Company and any Affiliates) exceeds one hundred thousand dollars ($100,000), the
Options or portions thereof that exceed such limit (according to the order in which they were granted) will be treated as Nonstatutory Stock Options, notwithstanding any contrary provision of the applicable Option Agreement(s). 

(f) Investment Assurances. The Company may require a Participant, as a condition of exercising or acquiring Common Stock under any Stock
Award, (i) to give written assurances satisfactory to the Company as to the Participant’s knowledge and experience in financial and business matters and/or to employ a purchaser representative reasonably satisfactory to the Company who is
knowledgeable and experienced in financial and business matters and that he or she is capable of evaluating, alone or together with the purchaser representative, the merits and risks of exercising the Stock Award; and (ii) to give written
assurances satisfactory to the Company stating that the Participant is acquiring Common Stock subject to the Stock Award for the Participant’s own account and not with any present intention of selling or otherwise distributing the Common Stock.
The foregoing requirements, and any assurances given pursuant to such requirements, will be inoperative if (x) the issuance of the shares upon the exercise or acquisition of Common Stock under the Stock Award has been registered under a then
currently effective registration statement under the Securities Act, or (y) as to any particular requirement, a determination is made by counsel for the Company that such requirement need not be met in the circumstances under the then
applicable securities laws. The Company may, upon advice of counsel to the Company, place legends on stock certificates issued under the Plan as such counsel deems necessary or appropriate in order to comply with applicable securities laws,
including, but not limited to, legends restricting the transfer of the Common Stock. 

  
 14. 

 (g) Withholding Obligations. To the extent provided by the terms of a Stock Award
Agreement, the Company may, in its sole discretion, satisfy any federal, state or local tax withholding obligation relating to a Stock Award by any of the following means (in addition to the Company’s right to withhold from any compensation
paid to the Participant by the Company) or by a combination of such means: (i) causing the Participant to tender a cash payment; (ii) withholding shares of Common Stock from the shares of Common Stock issued or otherwise issuable to the
Participant in connection with the Stock Award; provided, however, that no shares of Common Stock are withheld with a value exceeding the minimum amount of tax required to be withheld by law (or such lower amount as may be necessary to avoid
classification of the Stock Award as a liability for financial accounting purposes); (iii) withholding payment from any amounts otherwise payable to the Participant; (iv) withholding cash from a Stock Award settled in cash; or (v) by such
other method as may be set forth in the Stock Award Agreement. 
 (h) Electronic Delivery. Any reference in this Plan to a
“written” agreement or document will include any agreement or document delivered electronically or posted on the Company’s intranet. 

(i) Deferrals. To the extent permitted by applicable law, the Board, in its sole discretion, may determine that the delivery of Common
Stock or the payment of cash, upon the exercise, vesting or settlement of all or a portion of any Stock Award may be deferred and may establish programs and procedures for deferral elections to be made by Participants. Deferrals by Participants will
be made in accordance with Section 409A of the Code. Consistent with Section 409A of the Code, the Board may provide for distributions while a Participant is still an employee. The Board is authorized to make deferrals of Stock Awards and
determine when, and in what annual percentages, Participants may receive payments, including lump sum payments, following the Participant’s termination of employment or retirement, and implement such other terms and conditions consistent with
the provisions of the Plan and in accordance with applicable law. 
 (j) Compliance with Section 409A. To the
extent that the Board determines that any Stock Award granted hereunder is subject to Section 409A of the Code, the Stock Award Agreement evidencing such Stock Award will incorporate the terms and conditions necessary to avoid the consequences
specified in Section 409A(a)(1) of the Code. To the extent applicable, the Plan and Stock Award Agreements will be interpreted in accordance with Section 409A of the Code and Department of Treasury regulations and other interpretive
guidance issued thereunder, including without limitation any such regulations or other guidance that may be issued or amended after the Effective Date. Notwithstanding any provision of the Plan to the contrary, in the event that following the
Effective Date the Board determines that any Stock Award may be subject to Section 409A of the Code and related Department of Treasury guidance (including such Department of Treasury guidance as may be issued after the Effective Date), the
Board may adopt such amendments to the Plan and the applicable Stock Award Agreement or adopt other policies and procedures (including amendments, policies and procedures with retroactive effect), or take any other actions, that the Board determines
are necessary or appropriate to (1) exempt the Stock Award from Section 409A of the Code and/or preserve the intended tax treatment of the benefits provided with respect to the Stock Award, or (2) comply with the requirements of
Section 409A of the Code and related Department of Treasury guidance. 

  
 15. 

 (k) Compliance with Exemption Provided by Rule
12h-1(f). If: (i) the aggregate of the number of Optionholders and the number of holders of all other outstanding compensatory employee stock options to purchase shares of Common Stock equals or
exceeds five hundred (500), and (ii) the assets of the Company at the end of the Company’s most recently completed fiscal year exceed $10 million, then the following restrictions will apply during any period during which the Company
does not have a class of its securities registered under Section 12 of the Exchange Act and is not required to file reports under Section 15(d) of the Exchange Act: (A) the Options and, prior to exercise, the shares of Common Stock
acquired upon exercise of the Options may not be transferred until the Company is no longer relying on the exemption provided by Rule 12h-1(f) promulgated under the Exchange Act (“Rule 12h-1(f)”), except: (1) as permitted by Rule 701(c) promulgated under the Securities Act, (2) to a guardian upon the disability of the Optionholder, or (3) to an executor upon the death
of the Optionholder (collectively, the “Permitted Transferees”); provided, however, the following transfers are permitted: (i) transfers by the Optionholder to the Company, and (ii) transfers in connection
with a change of control or other acquisition involving the Company, if following such transaction, the Options no longer remain outstanding and the Company is no longer relying on the exemption provided by Rule
12h-1(f); provided further, that any Permitted Transferees may not further transfer the Options; (B) except as otherwise provided in (A) above, the Options and shares of Common Stock acquired
upon exercise of the Options are restricted as to any pledge, hypothecation, or other transfer, including any short position, any “put equivalent position” as defined by Rule 16a-1(h) promulgated
under the Exchange Act, or any “call equivalent position” as defined by Rule 16a-1(b) promulgated under the Exchange Act by the Optionholder prior to exercise of an Option until the Company is no
longer relying on the exemption provided by Rule 12h-1(f); and (C) at any time that the Company is relying on the exemption provided by Rule 12h-1(f), the Company
will deliver to Optionholders (whether by physical or electronic delivery or written notice of the availability of the information on an internet site) the information required by Rule 701(e)(3), (4), and (5) promulgated under the Securities
Act every six (6) months, including financial statements that are not more than one hundred eighty (180) days old; provided, however, that the Company may condition the delivery of such information upon the Optionholder’s
agreement to maintain its confidentiality.     
 (l) Repurchase Limitation. The terms of any repurchase option
will be specified in the Stock Award Agreement. The repurchase price for vested shares of Common Stock will be the Fair Market Value of the shares of Common Stock on the date of repurchase. The repurchase price for unvested shares of Common Stock
will be the lower of (i) the Fair Market Value of the shares of Common Stock on the date of repurchase or (ii) their original purchase price. However, the Company will not exercise its repurchase option until at least six (6) months
(or such longer or shorter period of time necessary to avoid classification of the Stock Award as a liability for financial accounting purposes) have elapsed following delivery of shares of Common Stock subject to the Stock Award, unless otherwise
specifically provided by the Board. 
 9. ADJUSTMENTS UPON CHANGES IN COMMON
STOCK; OTHER CORPORATE EVENTS. 
 (a) Capitalization Adjustments. In
the event of a Capitalization Adjustment, the Board will proportionately and appropriately adjust: (i) the class(es) and maximum number of securities subject to the Plan pursuant to Section 3(a), (ii) the class(es) and maximum number of
securities that may be issued pursuant to the exercise of Incentive Stock Options pursuant to Section 3(c), and (iii) the class(es) and number of securities and price per share of stock subject to outstanding Stock Awards. The Board will
make such adjustments, and its determination will be final, binding and conclusive.     

  
 16. 

 (b) Dissolution or Liquidation. Except as otherwise provided in the Stock Award
Agreement, in the event of a dissolution or liquidation of the Company, all outstanding Stock Awards (other than Stock Awards consisting of vested and outstanding shares of Common Stock not subject to the Company’s right of repurchase) will
terminate immediately prior to the completion of such dissolution or liquidation, and the shares of Common Stock subject to the Company’s repurchase option may be repurchased by the Company notwithstanding the fact that the holder of such Stock
Award is providing Continuous Service, provided, however, that the Board may, in its sole discretion, cause some or all Stock Awards to become fully vested, exercisable and/or no longer subject to repurchase or forfeiture (to the extent such
Stock Awards have not previously expired or terminated) before the dissolution or liquidation is completed but contingent on its completion. 

(a) Corporate Transaction. The following provisions will apply to Stock Awards in the event of a Corporate Transaction unless otherwise
provided in the instrument evidencing the Stock Award or any other written agreement between the Company or any Affiliate and the holder of the Stock Award or unless otherwise expressly provided by the Board at the time of grant of a Stock Award.
Except as otherwise stated in the Stock Award Agreement, in the event of a Corporate Transaction, then, notwithstanding any other provision of the Plan, the Board will take one or more of the following actions with respect to Stock Awards,
contingent upon the closing or completion of the Corporate Transaction: 
 (i) arrange for the surviving corporation or acquiring
corporation (or the surviving or acquiring corporation’s parent company) to assume or continue the Stock Award or to substitute a similar stock award for the Stock Award (including, but not limited to, an award to acquire the same consideration
paid to the stockholders of the Company pursuant to the Corporate Transaction); 
 (ii) arrange for the assignment of any
reacquisition or repurchase rights held by the Company in respect of Common Stock issued pursuant to the Stock Award to the surviving corporation or acquiring corporation (or the surviving or acquiring corporation’s parent company); 

(iii) accelerate the vesting of the Stock Award (and, if applicable, the time at which the Stock Award may be exercised) to a date prior
to the effective time of such Corporate Transaction as the Board will determine (or, if the Board will not determine such a date, to the date that is five (5) days prior to the effective date of the Corporate Transaction), with such Stock Award
terminating if not exercised (if applicable) at or prior to the effective time of the Corporate Transaction; 
 (iv) arrange for the
lapse of any reacquisition or repurchase rights held by the Company with respect to the Stock Award; 

  
 17. 

 (v) terminate or cancel, or arrange for the termination or cancellation, of the Stock
Award, to the extent not vested or not exercised prior to the effective time of the Corporate Transaction; and 
 (vi) make a payment,
in such form as may be determined by the Board equal to the excess, if any, of (A) the value of the property the holder of the Stock Award would have received upon the exercise of the Stock Award, over (B) any exercise price payable by
such holder in connection with such exercise. 
 The Board need not take the same action with respect to all Stock Awards or with respect to all
Participants.  
 (b) Change in Control. A Stock Award may be subject to additional acceleration of vesting and exercisability
upon or after a Change in Control as may be provided in the Stock Award Agreement for such Stock Award or as may be provided in any other written agreement between the Company or any Affiliate and the Participant, but in the absence of such
provision, no such acceleration will occur. 
 10. TERMINATION OR SUSPENSION OF
THE PLAN. 
 (a) Plan Term. The Board may suspend or terminate the Plan at any time. Unless sooner
terminated by the Board pursuant to Section 2, the Plan will automatically terminate on the day before the tenth (10th) anniversary of the earlier of (i) the date the Plan is adopted by the Board, or (ii) the date the Plan is approved
by the stockholders of the Company. No Stock Awards may be granted under the Plan while the Plan is suspended or after it is terminated. 

(b) No Impairment of Rights. Suspension or termination of the Plan will not impair rights and obligations under any Stock Award granted
while the Plan is in effect except with the written consent of the affected Participant. 
 11. EFFECTIVE DATE
OF PLAN. 
 This Plan will become effective on the Effective Date.  

12. CHOICE OF LAW. 

The law of the State of Delaware will govern all questions concerning the construction, validity and interpretation of this Plan, without
regard to that state’s conflict of laws rules. 
 13. DEFINITIONS. As used in the Plan, the following definitions will apply to
the capitalized terms indicated below:  
 (a) “Affiliate” means, at the time of determination, any
“parent” or “majority-owned subsidiary” of the Company, as such terms are defined in Rule 405 of the Securities Act. The Board will have the authority to determine the time or times at which “parent” or
“majority-owned subsidiary” status is determined within the foregoing definition. 
 (b) “Board”
means the Board of Directors of the Company. 

  
 18. 

 (c) “Capitalization Adjustment” means any change that is made
in, or other events that occur with respect to, the Common Stock subject to the Plan or subject to any Stock Award after the Effective Date without the receipt of consideration by the Company (through merger, consolidation, reorganization,
recapitalization, reincorporation, stock dividend, dividend in property other than cash, stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure or other transaction not involving the receipt of
consideration by the Company). Notwithstanding the foregoing, the conversion of any convertible securities of the Company will not be treated as a transaction “without the receipt of consideration” by the Company. 

(d) “Cause” means with respect to a Participant, the occurrence of any of the following events:
(i) such Participant’s commission of any felony or any crime involving fraud, dishonesty or moral turpitude under the laws of the United States or any state thereof; (ii) such Participant’s attempted commission of, or
participation in, a fraud or act of dishonesty against the Company; (iii) such Participant’s intentional, material violation of any contract or agreement between the Participant and the Company or of any statutory duty owed to the Company;
(iv) such Participant’s unauthorized use or disclosure of the Company’s confidential information or trade secrets; or (v) such Participant’s gross misconduct. The determination that a termination of the Participant’s
Continuous Service is either for Cause or without Cause will be made by the Company in its sole discretion. Any determination by the Company that the Continuous Service of a Participant was terminated by reason of dismissal without Cause for the
purposes of outstanding Stock Awards held by such Participant will have no effect upon any determination of the rights or obligations of the Company or such Participant for any other purpose.  

(e) “Change in Control” means the occurrence, in a single transaction or in a series of related transactions, of
any one or more of the following events: 
 (i) any Exchange Act Person becomes the Owner, directly or indirectly, of securities of
the Company representing more than fifty percent (50%) of the combined voting power of the Company’s then outstanding securities other than by virtue of a merger, consolidation or similar transaction. Notwithstanding the foregoing, a Change in
Control will not be deemed to occur (A) on account of the acquisition of securities of the Company by an investor, any affiliate thereof or any other Exchange Act Person that acquires the Company’s securities in a transaction or series of
related transactions the primary purpose of which is to obtain financing for the Company through the issuance of equity securities or (B) solely because the level of Ownership held by any Exchange Act Person (the “Subject
Person”) exceeds the designated percentage threshold of the outstanding voting securities as a result of a repurchase or other acquisition of voting securities by the Company reducing the number of shares outstanding, provided that if a
Change in Control would occur (but for the operation of this sentence) as a result of the acquisition of voting securities by the Company, and after such share acquisition, the Subject Person becomes the Owner of any additional voting securities
that, assuming the repurchase or other acquisition had not occurred, increases the percentage of the then outstanding voting securities Owned by the Subject Person over the designated percentage threshold, then a Change in Control will be deemed to
occur; 

  
 19. 

 (ii) there is consummated a merger, consolidation or similar transaction involving
(directly or indirectly) the Company and, immediately after the consummation of such merger, consolidation or similar transaction, the stockholders of the Company immediately prior thereto do not Own, directly or indirectly, either
(A) outstanding voting securities representing more than fifty percent (50%) of the combined outstanding voting power of the surviving Entity in such merger, consolidation or similar transaction or (B) more than fifty percent (50%) of the
combined outstanding voting power of the parent of the surviving Entity in such merger, consolidation or similar transaction, in each case in substantially the same proportions as their Ownership of the outstanding voting securities of the Company
immediately prior to such transaction; 
 (iii) there is consummated a sale, lease, exclusive license or other disposition of all or
substantially all of the consolidated assets of the Company and its Subsidiaries, other than a sale, lease, license or other disposition of all or substantially all of the consolidated assets of the Company and its Subsidiaries to an Entity, more
than fifty percent (50%) of the combined voting power of the voting securities of which are Owned by stockholders of the Company in substantially the same proportions as their Ownership of the outstanding voting securities of the Company immediately
prior to such sale, lease, license or other disposition; or 
 (iv) individuals who, on the date this Plan is adopted by the Board,
are members of the Board (the “Incumbent Board”) cease for any reason to constitute at least a majority of the members of the Board; provided, however, that if the appointment or election (or nomination for election)
of any new Board member was approved or recommended by a majority vote of the members of the Incumbent Board then still in office, such new member will, for purposes of this Plan, be considered as a member of the Incumbent Board.  

Notwithstanding the foregoing definition or any other provision of this Plan, (A) the term Change in Control will not include a sale of
assets, merger or other transaction effected exclusively for the purpose of changing the domicile of the Company, and (B) the definition of Change in Control (or any analogous term) in an individual written agreement between the Company or any
Affiliate and the Participant will supersede the foregoing definition with respect to Stock Awards subject to such agreement; provided, however, that if no definition of Change in Control or any analogous term is set forth in such an
individual written agreement, the foregoing definition will apply. 
 (f) “Code” means the Internal Revenue
Code of 1986, as amended. 
 (g) “Committee” means a committee of one (1) or more Directors to whom
authority has been delegated by the Board in accordance with Section 2(c). 
 (h) “Common Stock” means
the common stock of the Company. 
 (i) “Company” means NexImmune, Inc., a Delaware corporation. 

(j) “Consultant” means any person, including an advisor, who is (i) engaged by the Company or an Affiliate
to render consulting or advisory services and is compensated for such services, or (ii) serving as a member of the board of directors of an Affiliate and is compensated for such services. However, service solely as a Director, or payment of a
fee for such service, will not cause a Director to be considered a “Consultant” for purposes of the Plan.  

  
 20. 

 (k) “Continuous Service” means that the Participant’s
service with the Company or an Affiliate, whether as an Employee, Director or Consultant, is not interrupted or terminated. A change in the capacity in which the Participant renders service to the Company or an Affiliate as an Employee, Director, or
Consultant or a change in the Entity for which the Participant renders such service, provided that there is no interruption or termination of the Participant’s service with the Company or an Affiliate, will not terminate a Participant’s
Continuous Service; provided, however, if the Entity for which a Participant is rendering service ceases to qualify as an Affiliate, as determined by the Board in its sole discretion, such Participant’s Continuous Service will be
considered to have terminated on the date such Entity ceases to qualify as an Affiliate. For example, a change in status from an employee of the Company to a consultant of an Affiliate or to a Director will not constitute an interruption of
Continuous Service. To the extent permitted by law, the Board or the chief executive officer of the Company, in that party’s sole discretion, may determine whether Continuous Service will be considered interrupted in the case of any leave of
absence approved by that party, including sick leave, military leave or any other personal leave. Notwithstanding the foregoing, a leave of absence will be treated as Continuous Service for purposes of vesting in a Stock Award only to such extent as
may be provided in the Company’s leave of absence policy, in the written terms of any leave of absence agreement or policy applicable to the Participant, or as otherwise required by law. 

(l) “Corporate Transaction” means the occurrence, in a single transaction or in a series of related
transactions, of any one or more of the following events: 
 (i) the consummation of a sale or other disposition of all or
substantially all, as determined by the Board in its sole discretion, of the consolidated assets of the Company and its Subsidiaries; 

(ii) the consummation of a sale or other disposition of at least ninety percent (90%) of the outstanding securities of the Company; 

(iii) the consummation of a merger, consolidation or similar transaction following which the Company is not the surviving corporation;
or 
 (iv) the consummation of a merger, consolidation or similar transaction following which the Company is the surviving corporation
but the shares of Common Stock outstanding immediately preceding the merger, consolidation or similar transaction are converted or exchanged by virtue of the merger, consolidation or similar transaction into other property, whether in the form of
securities, cash or otherwise. 
 (m) “Director” means a member of the Board. 

(n) “Disability” means the inability of a Participant to engage in any substantially gainful activity by reason
of any medically determinable physical or mental impairment which can be expected to result in death or which has lasted or can be expected to last for a continuous period of not less than twelve (12) months, and will be determined by the Board
on the basis of such medical evidence as the Board deems warranted under the circumstances.  

  
 21. 

 (o) “Effective Date” means the effective date of this Plan,
which is the earlier of (i) the date that this Plan is first approved by the Company’s stockholders, or (ii) the date this Plan is adopted by the Board. 

(p) “Employee” means any person employed by the Company or an Affiliate. However, service solely as a Director,
or payment of a fee for such services, will not cause a Director to be considered an “Employee” for purposes of the Plan. 
 (q)
“Entity” means a corporation, partnership, limited liability company or other entity. 
 (r)
“Exchange Act” means the Securities Exchange Act of 1934, as amended. 
 (s) “Exchange Act
Person” means any natural person, Entity or “group” (within the meaning of Section 13(d) or 14(d) of the Exchange Act), except that “Exchange Act Person” will not include (i) the Company or
any Subsidiary of the Company, (ii) any employee benefit plan of the Company or any Subsidiary of the Company or any trustee or other fiduciary holding securities under an employee benefit plan of the Company or any Subsidiary of the Company,
(iii) an underwriter temporarily holding securities pursuant to an offering of such securities, (iv) an Entity Owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their Ownership of
stock of the Company; or (v) any natural person, Entity or “group” (within the meaning of Section 13(d) or 14(d) of the Exchange Act) that, as of the Effective Date of the Plan as set forth in Section 11, is the Owner,
directly or indirectly, of securities of the Company representing more than fifty percent (50%) of the combined voting power of the Company’s then outstanding securities. 

(t) “Fair Market Value” means, as of any date, the value of the Common Stock determined by the Board in
compliance with Section 409A of the Code or, in the case of an Incentive Stock Option, in compliance with Section 422 of the Code. 

(u) “Incentive Stock Option” means an Option that qualifies as an “incentive stock option” within the
meaning of Section 422 of the Code and the regulations promulgated thereunder. 
 (v) “Nonstatutory Stock
Option” means an Option that does not qualify as an Incentive Stock Option. 
 (w) “Officer”
means any person designated by the Company as an officer. 
 (x) “Option” means an Incentive Stock Option or a
Nonstatutory Stock Option to purchase shares of Common Stock granted pursuant to the Plan. 
 (y) “Option
Agreement” means a written agreement between the Company and an Optionholder evidencing the terms and conditions of an Option grant. Each Option Agreement will be subject to the terms and conditions of the Plan. 

(z) “Optionholder” means a person to whom an Option is granted pursuant to the Plan or, if applicable, such
other person who holds an outstanding Option. 

  
 22. 

 (aa) “Own,” “Owned,”
“Owner,” “Ownership” A person or Entity will be deemed to “Own,” to have “Owned,” to be the “Owner” of, or to have acquired “Ownership” of securities if
such person or Entity, directly or indirectly, through any contract, arrangement, understanding, relationship or otherwise, has or shares voting power, which includes the power to vote or to direct the voting, with respect to such securities. 

(bb) “Participant” means a person to whom a Stock Award is granted pursuant to the Plan or, if applicable, such
other person who holds an outstanding Stock Award. 
 (cc) “Plan” means this NexImmune, Inc. 2011 Equity
Incentive Plan. 
 (dd) “Restricted Stock Award” means an award of shares of Common Stock which is granted
pursuant to the terms and conditions of Section 6(a). 
 (ee) “Restricted Stock Award Agreement” means a
written agreement between the Company and a holder of a Restricted Stock Award evidencing the terms and conditions of a Restricted Stock Award. Each Restricted Stock Award Agreement will be subject to the terms and conditions of the Plan. 

(ff) “Restricted Stock Unit Award” means a right to receive shares of Common Stock which is
granted pursuant to the terms and conditions of Section 6(b). 
 (gg) “Restricted Stock Unit Award
Agreement” means a written agreement between the Company and a holder of a Restricted Stock Unit Award evidencing the terms and conditions of a Restricted Stock Unit Award grant. Each Restricted Stock Unit Award Agreement
will be subject to the terms and conditions of the Plan. 
 (hh) “Securities Act” means the Securities Act of
1933, as amended. 
 (ii) “Stock Appreciation Right” means a right to receive the appreciation on Common Stock
that is granted pursuant to the terms and conditions of Section 6(c). 
 (jj) “Stock Appreciation Right
Agreement” means a written agreement between the Company and a holder of a Stock Appreciation Right evidencing the terms and conditions of a Stock Appreciation Right grant. Each Stock Appreciation Right Agreement will be subject to the
terms and conditions of the Plan. 
 (kk) “Stock Award” means any right to receive Common Stock granted under
the Plan, including an Incentive Stock Option, a Nonstatutory Stock Option, a Restricted Stock Award, a Restricted Stock Unit Award, or a Stock Appreciation Right. 

(ll) “Stock Award Agreement” means a written agreement between the Company and a Participant evidencing the
terms and conditions of a Stock Award grant. Each Stock Award Agreement will be subject to the terms and conditions of the Plan. 

  
 23. 

 (mm) “Subsidiary” means, with respect to the Company,
(i) any corporation of which more than fifty percent (50%) of the outstanding capital stock having ordinary voting power to elect a majority of the board of directors of such corporation (irrespective of whether, at the time, stock of any other
class or classes of such corporation will have or might have voting power by reason of the happening of any contingency) is at the time, directly or indirectly, Owned by the Company, and (ii) any partnership, limited liability company or other
entity in which the Company has a direct or indirect interest (whether in the form of voting or participation in profits or capital contribution) of more than fifty percent (50%) . 

(nn) “Ten Percent Stockholder” means a person who Owns (or is deemed to Own pursuant to Section 424(d) of
the Code) stock possessing more than ten percent (10%) of the total combined voting power of all classes of stock of the Company or any Affiliate. 

  
 24. 

 Exhibit 10.2.1A 

NEXIMMUNE, INC. 

AMENDMENT NO. 1 

TO 
 2017
EQUITY INCENTIVE PLAN 
 ADOPTED BY THE
BOARD OF DIRECTORS: MARCH 3, 2017 
 APPROVED
BY THE STOCKHOLDERS: APRIL 28, 2017 
 Reference is hereby made to the
NexImmune, Inc. 2017 Equity Incentive Plan (the “Plan”). Capitalized terms used and not otherwise defined herein shall have meanings ascribed to such terms in the Plan. 

The first sentence of Section 3(a) of the Plan is hereby amended and restated in its entirety to read as follows: “Subject to
Section 9(a) relating to Capitalization Adjustments, the aggregate number of shares of Common Stock of the Company that may be issued pursuant to Stock Awards after the Effective Date will not exceed 10,906,667.” 

Except as expressly set forth above, the Plan remains in full force and effect in accordance with its terms.

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