FORM OF LOCK-UP AGREEMENT

Exhibit 10.3

FORM OF LOCK-UP AGREEMENT

[•], 2022

Gemini Therapeutics, Inc.

000 Xxxxxx Xxxx Xxxx #000

Xxxxxxx, XX 00000

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]