Document:

EX-10.2

 Exhibit 10.2 

FORM OF GEM STOCKHOLDER SUPPORT AGREEMENT 

This Support Agreement (this “Agreement”) is made and entered into as of [•], 2022, by and among Disc Medicine, Inc. a
Delaware corporation (the “Company”), Gemini Therapeutics, Inc., a Delaware corporation (“Gem”), and the undersigned stockholder (the “Stockholder”) of Gem. Capitalized terms used herein but not
otherwise defined shall have the respective meanings ascribed to such terms in the Merger Agreement (as defined below). 
 RECITALS

 WHEREAS, concurrently with the execution and delivery hereof, Gem, the Company and Gemstone Merger Sub, Inc., a Delaware corporation
and a wholly owned subsidiary of Gem (the “Merger Sub”), have entered into an agreement and plan of merger (as such agreement may be amended or supplemented from time to time pursuant to the terms thereof, the “Merger
Agreement”), pursuant to which Merger Sub will merge with and into the Company, with the Company surviving the merger as the surviving corporation and a wholly owned subsidiary of Gem (the “Merger”) upon the terms and
subject to the conditions set forth in the Merger Agreement. 
 WHEREAS, as of the date hereof, the Stockholder is the beneficial owner (as
defined in Rule 13d-3 under the Exchange Act) of such number of shares of Gem Common Stock as indicated in Appendix A. 

WHEREAS, as an inducement to the willingness of the Company to enter into the Merger Agreement, the Company has required that Stockholder
enter into this Agreement. 
 NOW, THEREFORE, intending to be legally bound, the parties hereby agree as follows: 

1. Certain Definitions. Capitalized terms used but not otherwise defined herein shall have the meanings ascribed thereto in the Merger
Agreement. For all purposes of this Agreement, the following terms shall have the following respective meanings: 
 (a) “Constructive
Sale” means, with respect to any security, a short sale with respect to such security, entering into or acquiring a derivative contract with respect to such security, entering into or acquiring a futures or forward contract to deliver such
security or entering into any other hedging or other derivative transaction that has the effect of either directly or indirectly materially changing the economic benefits or risks of ownership of such security. 

(b) “Shares” means (i) all shares of Gem Common Stock owned, beneficially or of record, by the Stockholder as of the date
hereof, and (ii) all additional shares of Gem Common Stock acquired by the Stockholder, beneficially or of record, during the period commencing with the execution and delivery of this Agreement and expiring on the Closing Date. 

  
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 (c) “Transfer” or “Transferred” means, with respect to any
security, the direct or indirect assignment, sale, transfer, tender, exchange, pledge or hypothecation, or the grant, creation or suffrage of a lien, security interest or encumbrance in or upon, or the gift, grant or placement in trust, or the
Constructive Sale or other disposition of such security (including transfers by testamentary or intestate succession, by domestic relations order or other court order, or otherwise by operation of law) or any right, title or interest therein
(including any right or power to vote to which the holder thereof may be entitled, whether such right or power is granted by proxy or otherwise), or the record or beneficial ownership thereof, the offer to make such a sale, transfer, Constructive
Sale or other disposition, and each agreement, arrangement or understanding, whether or not in writing, to effect any of the foregoing. 
 2.
Transfer and Voting Restrictions. The Stockholder covenants to the Company as follows: 
 (a) Except as otherwise permitted by
Section 2(c), during the period commencing with the execution and delivery of this Agreement and expiring on the Expiration Date (as defined below), the Stockholder shall not Transfer any of the Stockholder’s Shares, or publicly announce
its intention to Transfer any of its Shares. 
 (b) Except as otherwise permitted by this Agreement or otherwise permitted or required or by
order of a court of competent jurisdiction or a Governmental Authority, the Stockholder will not commit any act that would restrict the Stockholder’s legal power, authority and right to vote all of the Shares held by the Stockholder or
otherwise prevent or disable the Stockholder from performing any of his, her or its obligations under this Agreement. Without limiting the generality of the foregoing, except for this Agreement and as otherwise permitted by this Agreement, the
Stockholder shall not enter into any voting agreement with any person or entity with respect to any of the Stockholder’s Shares, grant any person or entity any proxy (revocable or irrevocable) or power of attorney with respect to any of the
Shares, deposit any Shares in a voting trust or otherwise enter into any agreement or arrangement with any person or entity limiting or affecting the Stockholder’s legal power, authority or right to vote the Stockholder’s Shares in favor
of the Gem Stockholder Matters. 
 (c) Notwithstanding anything else herein to the contrary, the Stockholder may, at any time, Transfer
Shares (i) by will or other testamentary document or by intestacy, (ii) to any investment fund or other entity controlled or managed by the Stockholder or the investment adviser of general partner of the Stockholder, or an entity under
common control or management with the Stockholders (in each case, directly or indirectly) (iii) to any member of the Stockholder’s immediate family (or, if the Stockholder is a corporation, partnership or other entity, to an immediate
family member of a beneficial owner of the Shares held by the Stockholder), (iv) to any trust or other entity for the direct or indirect benefit of the Stockholder or the immediate family of the Stockholder (or, if the Stockholder is a corporation,
partnership or other entity, for the direct or indirect benefit of an immediate family member of a beneficial owner of the Shares held by the Stockholder) or otherwise for estate tax or estate planning purposes, (v) in the case of a Stockholder
who is not a natural person, by pro rata distributions from the Stockholder to its members, partners, or shareholders pursuant to the Stockholder’s organizational documents; provided, that in the cases of clauses (i)-(v) (x) such
Transferred Shares shall continue to be bound by this Agreement and (y) the applicable direct transferee (if any) of such Transferred Shares shall have executed and delivered to Gem and the Company a support agreement substantially identical to
this Agreement upon consummation of the Transfer or (vi) to the extent required by applicable Law. 

  
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 3. Agreement to Vote Shares. The Stockholder covenants to the Company as follows:

 (a) Until the Expiration Date (as defined below), at any meeting of the stockholders of Gem, however called, and at every adjournment or
postponement thereof, and on every action or approval by written consent of the stockholders of Gem, the Stockholder shall be present (in person or by proxy) and vote, or exercise its right to consent with respect to, all Shares held by the
Stockholder (A) in favor of the Gem Stockholder Matters and (B) against any Acquisition Proposal.
 (b) If the Stockholder is the
beneficial owner, but not the record holder, of Shares, the Stockholder agrees to take all actions necessary to cause the record holder and any nominees to be present (in person or by proxy) and vote all the Stockholder’s Shares in accordance
with this Section 3. 
 (c) In the event of a stock split, stock dividend or distribution, or any change in the
capital stock of Gem by reason of any split-up, reverse stock split, recapitalization, combination, reclassification, reincorporation, exchange of shares or the like, the term “Shares” shall be
deemed to refer to and include such shares as well as all such stock dividends and distributions and any securities into which or for which any or all of such shares may be changed or exchanged or which are received in such transaction. 

4. Action in Stockholder Capacity Only. The Stockholder is entering into this Agreement solely in the Stockholder’s capacity as a
record holder and beneficial owner, as applicable, of its Shares and not in the Stockholder’s capacity as a director or officer of Gem. Nothing herein shall limit or affect the Stockholder’s ability to act as an officer or director of Gem.

 5. Irrevocable Proxy. The Stockholder hereby revokes (or agrees to cause to be revoked) any proxies that the Stockholder has
heretofore granted with respect to its Shares. In the event and to the extent that the Stockholder fails to vote the Shares in accordance with Section 3 at any applicable meeting of the stockholders of Gem or pursuant to
any applicable written consent of the stockholders of Gem, the Stockholder shall be deemed to have irrevocably granted to, and appointed, the Company, and any individual designated in writing by it, and each of them individually, as his, her or its
proxy and attorney-in-fact (with full power of substitution), for and in its name, place and stead, to vote his, her or its Shares in any action by written consent of
Gem stockholders or at any meeting of the Gem stockholders called with respect to any of the matters specified in, and in accordance and consistent with, Section 3 of this Agreement. Gem agrees not to exercise the proxy
granted herein for any purpose other than the purposes described in this Agreement. Except as otherwise provided for herein, the Stockholder hereby affirms that the irrevocable proxy is coupled with an interest and may under no circumstances be
revoked and that such irrevocable proxy is executed and intended to be irrevocable. Notwithstanding any other provisions of this Agreement, the irrevocable proxy granted hereunder shall automatically terminate upon the termination of this Agreement.

  
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 6. No Solicitation. Subject to Section 4, the Stockholder
agrees not to, directly or indirectly, including through any of its officers, directors or agents, (a) solicit, seek or initiate or knowingly take any action to facilitate or encourage, any offers, inquiries or the making of any proposal or
offer that constitutes, or could reasonably be expected to lead to, any Acquisition Proposal or (b) enter into, continue or otherwise participate or engage in any discussions or negotiations regarding any Acquisition Proposal, or furnish to any
person any non-public information or afford any person, other than Gem or the Company, as applicable, access to such party’s property, books or records (except as required by applicable Law or pursuant to
a request by a Governmental Authority) in connection with, any Acquisition Proposal; provided, however, that nothing in this Section 6 shall prevent the Stockholder from referring a person to this
Section 6 or to the Merger Agreement. 
 7. Documentation and Information. The Stockholder shall permit and
hereby authorizes Gem and the Company to publish and disclose in all documents and schedules filed with the SEC, and any press release or other disclosure document that Gem or the Company reasonably determines to be necessary in connection with the
Merger and any of the Contemplated Transactions, a copy of this Agreement, the Stockholder’s identity and ownership of the Shares and the nature of the Stockholder’s commitments and obligations under this Agreement; provided, that, Gem and
the Company provide such documents, schedules, press release or other disclosure document to the Stockholder in advance for its review and comment. Each of Gem and the Company is an intended third-party beneficiary of this
Section 7. 
 8. No Exercise of Appraisal Rights; Waivers. The Stockholder hereby irrevocably and
unconditionally (a) waives, and agrees to cause to be waived and to prevent the exercise of, any rights of appraisal, any dissenters’ rights and any similar rights (including any notice requirements related thereto) relating to the Merger
that Stockholder may have by virtue of, or with respect to, any Shares (including all rights under Section 262 of the DGCL) and (b) agrees that the Stockholder will not bring, commence, institute, maintain, prosecute or voluntarily aid or
participate in any action, claim, suit or cause of action, in law or in equity, in any court or before any Governmental Authority, which (i) challenges the validity of or seeks to enjoin the operation of any provision of this Agreement or
(ii) alleges that the execution and delivery of this Agreement by the Stockholder, or the approval of the Merger Agreement by the Gem Board, breaches any fiduciary duty of the Gem Board or any member thereof; provided, that the Stockholder may
defend against, contest or settle any such action, claim, suit or cause of action brought against the Stockholder that relates solely to the Stockholder’s capacity as a director, officer or securityholder of Gem. 

9. Representations and Warranties of the Stockholder. The Stockholder hereby represents and warrants to the Company as follows: 

(a) (i) The Stockholder is the beneficial or record owner of the shares of Gem Common Stock indicated in Appendix A (each of which shall
be deemed to be “held” by the Stockholder for purposes of Section 3 unless otherwise expressly stated with respect to any shares in Appendix A), free and clear of any and all Liens; and (ii) the
Stockholder does not beneficially own any securities of Gem other than the shares of Gem Common Stock and rights to purchase shares Gem Common Stock set forth in Appendix A. 

  
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 (b) Except as otherwise provided in this Agreement, the Stockholder has full power and
authority to (i) make, enter into and carry out the terms of this Agreement and (ii) vote all of its Shares in the manner set forth in this Agreement without the consent or approval of, or any other action on the part of, any other person
or entity (including any Governmental Authority). Without limiting the generality of the foregoing, the Stockholder has not entered into any voting agreement (other than this Agreement) with any person with respect to any of the Stockholder’s
Shares, granted any person any proxy (revocable or irrevocable) or power of attorney with respect to any of the Stockholder’s Shares, deposited any of the Stockholder’s Shares in a voting trust or entered into any arrangement or agreement
with any person limiting or affecting the Stockholder’s legal power, authority or right to vote the Stockholder’s Shares on any matter. 

(c) This Agreement has been duly and validly executed and delivered by the Stockholder and (assuming the due authorization, execution and
delivery by the other parties hereto) constitutes a valid and binding agreement of the Stockholder enforceable against the Stockholder in accordance with its terms, subject to the Enforceability Exceptions. The execution and delivery of this
Agreement by the Stockholder and the performance by the Stockholder of the agreements and obligations hereunder will not result in any breach or violation of or be in conflict with or constitute a default under any term of any Contract or if
applicable any provision of an organizational document (including a certificate of incorporation) to or by which the Stockholder is a party or bound, or any applicable law to which the Stockholder (or any of the Stockholder’s assets) is subject
or bound, except for any such breach, violation, conflict or default which, individually or in the aggregate, would not reasonably be expected to materially impair or adversely affect the Stockholder’s ability to perform its obligations under
this Agreement. 
 (d) The Stockholder has had the opportunity to review the Merger Agreement and this Agreement with the Stockholder’s
legal counsel. The Stockholder understands and acknowledges that the Company is entering into the Merger Agreement in reliance upon the Stockholder’s execution, delivery and performance of this Agreement. 

(e) The execution, delivery and performance of this Agreement by the Stockholder do not and will not require any consent, approval,
authorization or permit of, action by, filing with or notification to, any Governmental Authority, except for any such consent, approval, authorization, permit, action, filing or notification the failure of which to make or obtain, individually or
in the aggregate, has not and would not materially impair the Stockholder’s ability to perform its obligations under this Agreement. 

(f) The Stockholder has had the opportunity to review the Merger Agreement and this Agreement with counsel of the Stockholder’s own
choosing. The Stockholder has had an opportunity to review with its own tax advisors the tax consequences of the Merger and the Contemplated Transactions. The Stockholder understands that it must rely solely on its advisors and not on any statements
or representations made by Gem, the Company or any of their respective agents or representatives with respect to the tax consequences of the Merger and the Contemplated Transactions. The Stockholder understands that such Stockholder (and not Gem,
the Company or the Surviving Corporation) shall be responsible for such Stockholder’s tax liability that may arise as a result of the Merger or the Contemplated Transactions. The Stockholder understands and acknowledges that the Company, Gem
and Merger Sub are entering into the Merger Agreement in reliance upon the Stockholder’s execution, delivery and performance of this Agreement. 

  
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 (g) With respect to the Stockholder, as of the date hereof, there is no action, suit,
investigation or proceeding pending against, or, to the knowledge of the Stockholder, threatened against, the Stockholder or any of the Stockholder’s properties or assets (including the Shares) that would reasonably be expected to prevent or
materially delay or impair the ability of the Stockholder to perform its obligations hereunder or to consummate the transactions contemplated hereby. 

10. Termination. This Agreement shall terminate and shall cease to be of any further force or effect as of the earlier of (a) such
date and time as the Merger Agreement shall have been terminated pursuant to the terms thereof or (b) the Effective Time (the “Expiration Date”); provided, however, that
(i) Section 11 shall survive the termination of this Agreement, and (ii) the termination of this Agreement shall not relieve any party hereto from any liability for any material and willful breach of this
Agreement prior to the Effective Time. 
 11. Miscellaneous Provisions. 

(a) Amendments. No amendment of this Agreement shall be effective against any party unless it shall be in writing and signed by each of
the parties hereto. 
 (b) Entire Agreement. This Agreement constitutes the entire agreement between the parties to this Agreement and
supersedes all other prior agreements, arrangements and understandings, both written and oral, among the parties with respect to the subject matter hereof. 

(c) Governing Law. All matters arising out of or relating to this Agreement and the transactions contemplated hereby (including its
interpretation, construction, performance and enforcement) shall be governed by and construed in accordance with the internal laws of the State of Delaware without giving effect to any choice or conflict of law provision or rule (whether of the
State of Delaware or any other jurisdiction) that would cause the application of laws of any jurisdictions other than those of the State of Delaware. 

(d) Jurisdiction. Each of the parties to this Agreement (i) consents to submit itself to the exclusive personal jurisdiction of the
Court of Chancery of the State of Delaware, New Castle County, or, if that court does not have jurisdiction, a federal court sitting in Wilmington, Delaware in any action or proceeding arising out of or relating to this Agreement or any of the
transactions contemplated by this Agreement, (ii) agrees that all claims in respect of such action or proceeding shall be heard and determined in any such court, (iii) agrees that it shall not attempt to deny or defeat such personal
jurisdiction by motion or other request for leave from any such court and (iv) agrees not to bring any action or proceeding arising out of or relating to this Agreement or any of the transactions contemplated by this Agreement in any other
court. Each of the parties hereto waives any defense of inconvenient forum to the maintenance of any action or proceeding so brought and waives any bond, surety or other security that might be required of any other party with respect thereto. Any
party may make service on another party by sending or delivering a copy of the process to the party to be served at the address and in the manner provided for the giving of notices in Section 11(j). Nothing in this
Section 11(d), however, shall affect the right of any party to serve legal process in any other manner permitted by law. 

  
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 (e) WAIVER OF JURY TRIAL. EACH OF THE PARTIES TO THIS AGREEMENT HEREBY IRREVOCABLY
WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR COUNTERCLAIM (WHETHER BASED ON CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY OR THE ACTIONS OF ANY PARTY TO THIS
AGREEMENT IN THE NEGOTIATION, ADMINISTRATION, PERFORMANCE AND ENFORCEMENT OF THIS AGREEMENT. 
 (f) Assignment. Except as otherwise
provided in Section 2(c) hereof, no party may assign any of its rights or delegate any of its performance obligations under this Agreement, in whole or in part, by operation of law or otherwise, without the prior written
consent of the other parties hereto, and any such assignment without such prior written consent shall be null and void. Subject to the preceding sentence, this Agreement shall be binding upon, inure to the benefit of, and be enforceable by, the
parties hereto and their respective successors and permitted assigns. Any purported assignment of rights or delegation of performance obligations in violation of this Section 11(f) is void. 

(g) No Third Party Rights. This Agreement is not intended to, and shall not, confer upon any other person any rights or remedies
hereunder other than the parties hereto to the extent expressly set forth herein. 
 (h) Severability. Any term or provision of this
Agreement that is invalid or unenforceable in any situation in any jurisdiction shall not affect the validity or enforceability of the remaining terms and provisions hereof or the validity or enforceability of the offending term or provision in any
other situation or in any other jurisdiction. If the final judgment of a court of competent jurisdiction declares that any term or provision hereof is invalid or unenforceable, the parties hereto agree that the court making such determination shall
have the power to limit the term or provision, to delete specific words or phrases, or to replace any invalid or unenforceable term or provision with a term or provision that is valid and enforceable and that comes closest to expressing the
intention of the invalid or unenforceable term or provision, and this Agreement shall be enforceable as so modified. In the event such court does not exercise the power granted to it in the prior sentence, the parties hereto agree to replace such
invalid or unenforceable term or provision with a valid and enforceable term or provision that will achieve, to the extent possible, the economic, business and other purposes of such invalid or unenforceable term. 

(i) Specific Performance. The parties hereto agree that irreparable damage would occur in the event that any of the provisions of this
Agreement were not performed in accordance with their specific terms or were otherwise breached. It is accordingly agreed that the parties shall be entitled to an injunction or injunctions to prevent breaches of this Agreement and to enforce
specifically the terms and provisions of this Agreement, this being in addition to any other remedy to which they are entitled at law or in equity. 

(j) Notices. All notices and other communications hereunder shall be in writing and shall be deemed duly delivered (i) three
Business Days after being sent by registered or certified mail, return receipt requested, postage prepaid, or (ii) one Business Day after being sent for next Business Day delivery, fees prepaid, via a reputable overnight courier service, in
each case to the intended recipient as follows: (A) if to the Company or Gem, to the address, electronic mail address or facsimile provided in the Merger Agreement, including to the persons designated therein to receive copies; and/or
(B) if to the Stockholder, to the Stockholder’s address, electronic mail address or facsimile shown below Stockholder’s signature to this Agreement. 

  
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 (k) Counterparts. This Agreement may be executed in two or more counterparts
(including by facsimile, by an electronic scan delivered by electronic mail or any electronic signature), each of which shall be deemed an original but all of which together shall be considered one and the same agreement and shall become effective
when counterparts have been signed by each of the parties hereto and delivered to the other parties, it being understood that all parties need not sign the same counterpart. This Agreement may be executed and delivered by facsimile, by an electronic
scan delivered by electronic mail or by delivery of any electronic signature. 
 (l) Confidentiality. Except to the extent required by
applicable Law or regulation, the Stockholder shall hold any non-public information regarding this Agreement, the Merger Agreement and the Merger in strict confidence and shall not divulge any such information
to any third person until Gem has publicly disclosed its entry into the Merger Agreement and this Agreement; provided, however, that the Stockholder may disclose such information to its Affiliates, partners, members, stockholders, parents,
subsidiaries, attorneys, accountants, consultants, trustees, beneficiaries and other representatives (provided that such Persons are subject to confidentiality obligations at least as restrictive as those contained herein). Neither the Stockholder
nor any of its Affiliates (other than Gem, whose actions shall be governed by the Merger Agreement), shall issue or cause the publication of any press release or other public announcement with respect to this Agreement, the Merger, the Merger
Agreement or the other transactions contemplated hereby or thereby without the prior written consent of the Company and Gem, except as may be required by applicable Law in which circumstance such announcing party shall make reasonable efforts to
consult with the Company and Gem to the extent practicable. The Company is an intended third-party beneficiary of this Section 11(l). 

(m) Interpretation. When reference is made in this Agreement to a Section or Appendix, such reference shall be to a Section of or
Appendix to this Agreement, unless otherwise indicated. The headings contained in this Agreement are for convenience of reference only and shall not affect in any way the meaning or interpretation of this Agreement. The language used in this
Agreement shall be deemed to be the language chosen by the parties hereto to express their mutual intent, and no rule of strict construction shall be applied against any party. Whenever the context may require, any pronouns used in this Agreement
shall include the corresponding masculine, feminine or neuter forms, and the singular form of nouns and pronouns shall include the plural, and vice versa. Any reference to any federal, state, local or foreign statute or law shall be deemed also to
refer to all rules and regulations promulgated thereunder, unless the context requires otherwise. Whenever the words “include,” “includes” or “including” are used in this Agreement, they shall be deemed to be followed
by the words “without limitation.” 
 [Remainder of Page Left Intentionally Blank] 

  
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 IN WITNESS WHEREOF, the undersigned have caused this Agreement to be duly executed as of the
date first above written. 
  

			
	COMPANY:
	Disc Medicine, Inc.
	
	              

	By:
	Title:
	
	GEM:
	Gemini Therapeutics, Inc.
	
	              

	By:
	Title:
	
	 [STOCKHOLDER],
 in his/her capacity
as the Stockholder:

		
	Signature:	 	              

	
	Address:
	
	              

	
	  

	
	  

  
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 Appendix AEX-10.3

 Exhibit 10.3 

FORM OF LOCK-UP AGREEMENT 

[•], 2022 
 Gemini Therapeutics, Inc. 

297 Boston Post Road #248 
 Wayland, MA 01778 

Ladies and Gentlemen: 
 The undersigned signatory of this lock-up agreement (this “Lock-Up Agreement”) understands that Gemini Therapeutics, Inc., a Delaware corporation (“Gem”), has entered into an
Agreement and Plan of Merger and Reorganization, dated as of [•], 2022 (as the same may be amended from time to time, the “Merger Agreement”) with Gemstone Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary
of Gem, and Disc Medicine, Inc., a Delaware corporation (the “Company”). Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed to such terms in the Merger Agreement. 

As a condition and inducement to Gem to enter into the Merger Agreement and to consummate the transactions contemplated thereby, and for other good and
valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned hereby irrevocably agrees that, subject to the exceptions set forth herein, without the prior written consent of Gem, the undersigned will not,
during the period commencing upon the Closing and ending on the date that is 180 days after the Closing Date (the “Restricted Period”): 

(1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option,
right or warrant to purchase, or otherwise transfer or dispose of, directly or indirectly, any shares of Gem Common Stock or any securities convertible into or exercisable or exchangeable for shares of Gem Common Stock (including without limitation,
shares of Gem Common Stock or such other securities which may be deemed to be beneficially owned by the undersigned in accordance with the rules and regulations of the SEC and securities of Gem which may be issued upon exercise of an option to
purchase shares of Gem Common Stock or a warrant to purchase shares of Gem Common Stock) that are currently or hereafter owned by the undersigned, except as set forth below (collectively, the “Undersigned’s Shares”); 

(2) enter into any swap, short sale, hedge or other agreement that transfers, in whole or in part, any of the economic consequences of
ownership of the Undersigned’s Shares regardless of whether any such transaction described in clause (1) above or this clause (2) is to be settled by delivery of shares of Gem Common Stock or other securities, in cash or otherwise;

 (3) make any demand for, or exercise any right with respect to, the registration of any shares of Gem Common Stock or any security
convertible into or exercisable or exchangeable for shares of Gem Common Stock (other than such rights set forth in the Merger Agreement); or 

(4) publicly disclose the intention to do any of the foregoing. 

 The restrictions and obligations contemplated by this Lock-Up
Agreement shall not apply to: 
 (a) transfers of the Undersigned’s Shares: 

(1) (A) to any person related to the undersigned (or to an ultimate beneficial owner of the undersigned) by blood or adoption who is an
immediate family member of the undersigned, or by marriage or domestic partnership (a “Family Member”), or to a trust formed for the benefit of the undersigned or any of the undersigned’s Family Members, (B) to the
undersigned’s estate, following the death of the undersigned, by will, intestacy or other operation of Law, (C) as a bona fide gift or a charitable contribution, (D) by operation of Law pursuant to a qualified domestic order or in
connection with a divorce settlement or (E) to any partnership, corporation or limited liability company which is controlled by the undersigned and/or by any such Family Member(s); 

(2) if the undersigned is a corporation, partnership, limited liability company or other entity, (A) to another corporation,
partnership, limited liability company or other entity that is a direct or indirect affiliate (as defined under Rule 12b-2 of the Exchange Act) of the undersigned, including investment funds or other entities
that controls or manages, is under common control or management with, or is controlled or managed by, the undersigned, (B) as a distribution or dividend to equity holders, current or former general or limited partners, members or managers (or
to the estates of any of the foregoing), as applicable, of the undersigned (including upon the liquidation and dissolution of the undersigned pursuant to a plan of liquidation approved by the undersigned’s equity holders), (C) as a bona fide
gift or a charitable contribution or otherwise to a trust or other entity for the direct or indirect benefit of an immediate family member of a beneficial owner (as defined in Rule 13d-3 of the Exchange Act)
of the Undersigned’s Shares or (D) transfers or dispositions not involving a change in beneficial ownership; or 
 (3) if the
undersigned is a trust, to any grantors or beneficiaries of the trust; 
 provided that, in the case of any transfer or distribution pursuant
to this clause (a), such transfer is not for value (other than transfers pursuant to 1(A), 1(E) or 2(A)) and each donee, heir, beneficiary or other transferee or distributee shall sign and deliver to Gem a
lock-up agreement in the form of this Lock-Up Agreement with respect to the shares of Gem Common Stock or such other securities that have been so transferred or
distributed; 
 (b) the exercise of an option to purchase shares of Gem Common Stock (including a net or cashless exercise of an option to
purchase shares of Gem Common Stock ), and any related transfer of shares of Gem Common Stock to Gem for the purpose of paying the exercise price of such options or for paying taxes (including estimated taxes) due as a result of the exercise of such
options or for paying taxes (including estimated taxes) due as a result of the exercise of such options; provided that, for the avoidance of doubt, the underlying shares of Gem Common Stock shall continue to be subject to the restrictions on
transfer set forth in this Lock-Up Agreement; 
 (c) transfers to Gem in connection with the net
settlement of any other equity award that represents the right to receive in the future shares of Gem Common Stock, settled in shares of Gem Common Stock, to pay any tax withholding obligations; provided that, for the avoidance of doubt, the
underlying shares of Gem Common Stock shall continue to be subject to the restrictions on transfer set forth in this Lock-Up Agreement; 

 (d) the establishment of a trading plan pursuant to Rule
10b5-1 under the Exchange Act for the transfer of shares of Gem Common Stock; provided that such plan does not provide for any transfers of shares of Gem Common Stock during the Restricted Period; 

(e) transfers by the undersigned of shares of Gem Common Stock purchased by the undersigned on the open market or in a public offering by Gem,
in each case following the date of the Merger Agreement; 
 (f) pursuant to a bona-fide third party tender offer, merger, consolidation or
other similar transaction made to all holders of Gem’s capital stock involving a change of control of Gem, provided that in the event that such tender offer, merger, consolidation or other such transaction is not completed, the
Undersigned’s Shares shall remain subject to the restrictions contained in this Lock-Up Agreement; 

(g) pursuant to an order of a court or regulatory agency; or 

(h) transfers by the undersigned of shares of Gem Common Stock issued pursuant to the Merger Agreement in respect of shares of the Company, if
any, purchased from the Company on or about the Closing Date but prior to the Closing. 
 and provided, further, that, with respect to each of (b),
(c), and (d) above, no filing by any party (including any donor, donee, transferor, transferee, distributor or distributee) under Section 16 of the Exchange Act or other public announcement shall be made voluntarily reporting a reduction
in beneficial ownership of shares of Gem Common Stock or any securities convertible into or exercisable or exchangeable for Gem Common Stock in connection with such transfer or disposition during the Restricted Period (other than any exit filings)
and if any filings under Section 16(a) of the Exchange Act, or other public filing, report or announcement reporting a reduction in beneficial ownership of shares of Gem Common Stock in connection with such transfer or distribution, shall be
legally required during the Restricted Period, such filing, report or announcement shall clearly indicate in the footnotes therein, in reasonable detail, a description of the circumstances of the transfer and that the shares remain subject to the lock-up agreement. 
 For purposes of this Lock-Up Agreement, “change of
control” shall mean the transfer (whether by tender offer, merger, consolidation or other similar transaction), in one transaction or a series of related transactions, to a person or group of affiliated persons,, of the Company’s voting
securities if, after such transfer, the Company’s stockholders as of immediately prior to such transfer do not hold a majority of the outstanding voting securities of the Company (or the surviving entity). 

Any attempted transfer in violation of this Lock-Up Agreement will be of no effect and null and void, regardless of
whether the purported transferee has any actual or constructive knowledge of the transfer restrictions set forth in this Lock-Up Agreement, and will not be recorded on the share register of Gem. In furtherance
of the foregoing, the undersigned agrees that Gem and any duly appointed transfer agent for the registration or transfer of the securities described herein are 

 
hereby authorized to decline to make any transfer of securities if such transfer would constitute a violation or breach of this Lock-Up Agreement. Gem may
cause the legend set forth below, or a legend substantially equivalent thereto, to be placed upon any certificate(s) or other documents, ledgers or instruments evidencing the undersigned’s ownership of Gem Common Stock: 

THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO AND MAY ONLY BE TRANSFERRED IN COMPLIANCE WITH A
LOCK-UP AGREEMENT, A COPY OF WHICH IS ON FILE AT THE PRINCIPAL OFFICE OF THE COMPANY. 
 The undersigned hereby
represents and warrants that the undersigned has full power and authority to enter into this Lock-Up Agreement. All authority herein conferred or agreed to be conferred and any obligations of the undersigned
shall be binding upon the successors, assigns, heirs or personal representatives of the undersigned. 
 The undersigned understands that if the Merger
Agreement is terminated for any reason, the undersigned shall be released from all obligations under this Lock-Up Agreement. The undersigned understands that Gem is proceeding with the transactions
contemplated by the Merger Agreement in reliance upon this Lock-Up Agreement. 
 Any and all remedies herein
expressly conferred upon Gem will be deemed cumulative with and not exclusive of any other remedy conferred hereby, or by Law or equity, and the exercise by Gem of any one remedy will not preclude the exercise of any other remedy. The undersigned
agrees that irreparable damage would occur to Gem in the event that any provision of this Lock-Up Agreement was not performed in accordance with its specific terms or were otherwise breached. It is accordingly
agreed that Gem shall be entitled to seek an injunction or injunctions to prevent breaches of this Lock-Up Agreement and to enforce specifically the terms and provisions hereof in any court of the United
States or any state having jurisdiction, this being in addition to any other remedy to which Gem is entitled at Law or in equity, and the undersigned waives any bond, surety or other security that might be required of Gem with respect thereto. 

In the event that any holder of Gem’s securities that are subject to a substantially similar agreement entered into by such holder, other than the
undersigned, is permitted by Gem to sell or otherwise transfer or dispose of shares of Gem Common Stock for value other than as permitted by this or a substantially similar agreement entered into by such holder (whether in one or multiple releases
or waivers), the same percentage of shares of Gem Common Stock held by the undersigned on the date of such release or waiver as the percentage of the total number of outstanding shares of Gem Common Stock held by such holder on the date of such
release or waiver that are the subject of such release or waiver shall be immediately and fully released on the same terms from any remaining restrictions set forth herein (the “Pro-Rata
Release”); provided, however, that such Pro-Rata Release shall not be applied unless and until permission has been granted by Gem to an equity holder or equity holders to sell or
otherwise transfer or dispose of all or a portion of such equity holders shares of Gem Common Stock in an aggregate amount in excess of 1% of the number of shares of Gem Common Stock subject to a substantially similar agreement. 

 Upon the release of any of the Undersigned’s Shares from this
Lock-Up Agreement, Gem will promptly cooperate with the undersigned to facilitate the timely preparation and delivery of certificates representing the Undersigned Shares without the restrictive legend above or
the withdrawal of any stop transfer instructions by virtue of this Lock-Up Agreement. 
 This Lock-Up Agreement and any claim, controversy or dispute arising under or related to this Lock-Up Agreement shall be governed by and construed in accordance with the Laws of
the state of Delaware, without regard to the conflict of Laws principles thereof. 
 This Lock-Up Agreement may be
executed in several counterparts, each of which shall be deemed an original and all of which shall constitute one and the same instrument. The exchange of a fully executed Lock-Up Agreement (in counterparts or
otherwise) by Gem and the undersigned by facsimile or electronic transmission in .pdf format shall be sufficient to bind such parties to the terms and conditions of this Lock-Up Agreement. 

[SIGNATURE PAGE FOLLOWS] 

 
					
		 	Very truly yours,
		
	Print Name of Stockholder:	 	
		
		 	  

		 	Signature (for individuals):
		
		 	  

		 	Signature (for entities):
			
		 	By:	 	  

		 		 	Name:
		 		 	Title:

 [Signature Page to Lock-Up Agreement] 

			
	 Accepted and Agreed

by Gemini Therapeutics, Inc.:

		
	By:	 	  

		 	Name:
		 	Title:

 [Signature Page to Lock-Up Agreement]

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