EX-10.2




 Exhibit 10.2 

REGISTRATION RIGHTS AGREEMENT 

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of May 28, 2020 (the “Effective
Date”), is made and entered into by and among Larimar Therapeutics, Inc., a Delaware corporation (f/k/a Zafgen, Inc.) (the “Company”), and the “Investors” named in that certain Securities Purchase Agreement, dated
as of May 28, 2020, by and among the Company and the Investors (the “Securities Purchase Agreement”). Capitalized terms used herein have the respective meanings ascribed thereto in the Securities Purchase Agreement unless
otherwise defined herein. 
 WHEREAS, this Agreement is made pursuant to the Securities Purchase Agreement to provide for certain
arrangements with respect to the registration of the Registrable Securities (as defined below) by the Company under the 1933 Act. 
 NOW,
THEREFORE, IN CONSIDERATION of the mutual covenants and agreements set forth herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound,
hereby agree as follows: 
 1. CERTAIN DEFINITIONS. As used in this Agreement, the following capitalized terms used herein shall have the following
meanings: 
 “Business Day” means any day other than Saturday, Sunday or other day on which commercial banks in the City of
New York are authorized or required by law to remain closed. 
 “Investors” means the Investors identified in the
Securities Purchase Agreement and any Affiliate or permitted transferee of any Investor who is a subsequent holder of Registrable Securities. 

“Prospectus” means (i) the prospectus included in any Registration Statement, as amended or supplemented by any
prospectus supplement, with respect to the terms of the offering of any portion of the Registrable Securities covered by such Registration Statement and by all other amendments and supplements to the prospectus, including post-effective amendments
and all material incorporated by reference in such prospectus, and (ii) any “free writing prospectus” as defined in Rule 405 under the 1933 Act. 

“Register,” “registered” and “registration” refer to a registration made by preparing and
filing a Registration Statement or similar document in compliance with the 1933 Act (as defined below), and the declaration or ordering of effectiveness of such Registration Statement or document. 

“Registrable Securities” means (i) the Shares, (ii) the Warrant Shares, and (iii) any other securities issued
or issuable with respect to or in exchange for Shares or Warrant Shares; provided, that, a security shall cease to be a Registrable Security upon (A) sale pursuant to a Registration Statement or Rule 144 under the 1933 Act, or (B) such
security becoming eligible for sale without restriction or limitation by such Investor (and any of its Affiliates whose shares must be aggregated with those of such Investor under Rule 144) pursuant to Rule 144 and without the requirement to be in
compliance with Rule 144(c)(1) (or any successor thereto) promulgated under the 1933 Act. 
  











 “Registration Statement” means any registration statement filed by the
Company under the 1933 Act and the rules and regulations promulgated thereunder that covers the resale of any of the Registrable Securities pursuant to the provisions of this Agreement, amendments and supplements to such Registration Statement,
including post-effective amendments, and all exhibits to and all material incorporated by reference in such Registration Statement. 

“Required Investors” means the Investors holding a majority of the Registrable Securities outstanding from time to time. 

“SEC” means the U.S. Securities and Exchange Commission. 

“Selling Investor” means any Investor electing to sell any of its Registrable Securities in a Registration. 

“Selling Investor Questionnaire” means a questionnaire in the form attached as Exhibit B hereto, or such other form of
questionnaire as may reasonably be adopted by the Company from time to time. 
 “Trading Day” means a day on which the
Common Stock is listed or quoted and traded on the Nasdaq Global Market. 
 2. REGISTRATION RIGHTS. 

(a) Registration Statements. 

(i) Promptly following the Effective Date but no later than thirty (30) days after the Effective Date (the “Filing
Deadline”), the Company shall prepare and file with the SEC a Registration Statement covering the resale of all of the Registrable Securities for an offering to be made on a continuous basis pursuant to Rule 415 under the 1933 Act
(“Rule 415”) or, if Rule 415 is not available for offers and sales of the Registrable Securities, by such other means of distribution of Registrable Securities as the Investors may reasonably specify (the “Initial
Registration Statement”). The Initial Registration Statement shall be on Form S-3 (except if the Company is then ineligible to register for resale the Registrable Securities on Form S-3, in which case such registration shall be on such other form available to register for resale the Registrable Securities as a secondary offering) subject to the provisions of
Section 2(a)(ii) and shall contain (except if otherwise required pursuant to written comments received from the SEC upon review of such Registration Statement) a “Plan of Distribution” substantially in the
form attached hereto as Exhibit A (which may be modified to respond to comments, if any, provided by the SEC); provided, however, that no Investor shall be named as an “underwriter” in such Registration Statement
without the Investor’s prior written consent. In the event that the Company is not eligible to register the Registrable Securities on Form S-3 and instead registers the Registrable Securities on another
form of registration statement pursuant to the 1933 Act, the Company shall convert or replace such registration statement with a registration statement on Form S-3 promptly following confirmation that the
Company becomes eligible to use Form S-3 to register the Registrable Securities. 

  
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 (ii) Such Registration Statement also shall cover, to the extent allowable under the 1933
Act and the rules promulgated thereunder (including Rule 416), such indeterminate number of additional shares of Common Stock resulting from stock splits, stock combinations, stock dividends or similar transactions with respect to the Registrable
Securities. Such Registration Statement (and each amendment or supplement thereto, and each request for acceleration of effectiveness thereof) shall be provided in accordance with Section 3(c) to the Investors prior to its
filing or other submission. 
 (b) Expenses. The Company will pay all expenses associated with each Registration Statement, including
filing and printing fees, the Company’s counsel and accounting fees and expenses, costs associated with clearing the Registrable Securities for sale under applicable state securities laws and listing fees, but excluding discounts, commissions,
fees of underwriters, selling brokers, dealer managers or similar securities industry professionals with respect to the Registrable Securities being sold. 

(c) Effectiveness. 
 (i)
The Company shall use commercially reasonable efforts to have each Registration Statement declared effective as soon as practicable after the filing. The Company shall notify the Investors as promptly as practicable, and in any event, within
twenty-four (24) hours, after the Registration Statement is declared effective and shall simultaneously provide the Investors with copies of any related Prospectus to be used in connection with the sale or other disposition of the securities
covered thereby. 
 (ii) For not more than ten (10) consecutive days or for a total of not more than twenty (20) days in any twelve
(12) month period, the Company may suspend the use of any Prospectus included in any Registration Statement contemplated by this Section 2 in the event that the Company determines in good faith that such suspension is
necessary to (A) delay the disclosure of material non-public information concerning the Company, the disclosure of which at the time is not, in the good faith opinion of the Company, in the best interests
of the Company or (B) amend or supplement the affected Registration Statement or the related Prospectus so that such Registration Statement or Prospectus shall not include any Misstatement (an “Allowed Delay”); provided,
that the Company shall promptly (1) notify each Investor in writing of the commencement of an Allowed Delay, but shall not (without the prior written consent of an Investor) disclose to such Investor any material
non-public information giving rise to an Allowed Delay, (2) advise the Investors in writing to cease all sales under such Registration Statement until the end of the Allowed Delay and (3) use
commercially reasonable efforts to terminate an Allowed Delay as promptly as practicable. 
 (d) Liquidated Damages. If: (i) the
Registration Statement is not filed on or prior to the Filing Deadline, (ii) the Company fails to file with the SEC a request for acceleration of a Registration Statement in accordance with Rule 461 promulgated by the SEC pursuant to the 1933
Act, within five (5) Trading Days of the date that the Company is notified (orally or in writing, whichever is earlier) by the SEC that such Registration Statement will not be “reviewed” or will not be subject to further review,
(iii) prior to the effective date of a Registration Statement, the Company fails to file a pre-effective amendment and otherwise respond in writing to comments made by the SEC in respect of such
Registration Statement within ten (10) calendar days after the receipt of comments by or notice from the SEC that such amendment is required in order for such Registration Statement to be declared effective, or (iv) the Company fails to
maintain the 

  
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effectiveness of the Registration Statement during the Effectiveness Period other than in connection with an Allowed Delay, or the Allowed Delay is exceeded (any such failure or breach being
referred to as an “Event”, and for purpose of clause (i), the date on which such Event occurs, and for purpose of clause (ii) the date on which such five (5) Trading Day period is exceeded, and for purpose of clause
(iii) the date which such ten (10) calendar day period is exceeded, and for purpose of clause (iv) the date on which the Allowed Delay, is exceeded being referred to as the “Event Date”), then, in addition to any
other rights the Investors may have hereunder or under applicable law, on each such Event Date and on each monthly anniversary of each such Event Date (if the applicable Event shall not have been cured by such date) until the applicable Event is
cured, the Company shall pay to each Investor an amount in cash, as partial liquidated damages and not as a penalty, equal to the product of 1.0% multiplied by the aggregate Purchase Price paid by such Investor pursuant to the Securities Purchase
Agreement. The amounts payable pursuant to the foregoing sentence are referred to collectively as “Liquidated Damages”. The parties agree that (1) notwithstanding anything to the contrary herein or in the Securities Purchase
Agreement, no Liquidated Damages shall be payable with respect to any period after the expiration of the Effectiveness Period and in no event shall the aggregate amount of Liquidated Damages payable to an Investor pursuant to this Section 2.(d)
exceed, in the aggregate, five percent (5%) of the aggregate purchase price paid by such Investor pursuant to the Securities Purchase Agreement and (2) in no event shall the Company be liable in any thirty
(30)-day period for Liquidated Damages under this Agreement in excess of one percent (1.0)% of the aggregate purchase price paid by the Investors pursuant to the Securities Purchase Agreement. If the Company
fails to pay any Liquidated Damages pursuant to this Section 2(d) in full within seven (7) calendar days after the date payable, the Company will pay interest thereon at a rate of one percent (1.0%) per annum (or such lesser maximum amount
that is permitted to be paid by applicable Law) to the Investor, accruing daily from the date such Liquidated Damages are due until such amounts, plus all such interest thereon, are paid in full. The Liquidated Damages pursuant to the terms hereof
shall apply on a daily pro rata basis for any portion of a month prior to the cure of an Event. The Effectiveness Deadline for a Registration Statement shall be extended without default and without the payment of Liquidated Damages hereunder in the
event that the Company’s failure to obtain the effectiveness of the Registration Statement on a timely basis results from the failure of an Investor to timely provide the Company with information requested by the Company and necessary to
complete the Registration Statement in accordance with the requirements of the 1933 Act. 
 (e) Rule 415; Cutback. If at
any time the SEC takes the position that the offering of some or all of the Registrable Securities in a Registration Statement is not eligible to be made on a delayed or continuous basis under the provisions of Rule 415 under the 1933 Act or
requires any Investor to be named as an “underwriter,” the Company shall use commercially reasonable efforts to persuade the SEC that the offering contemplated by such Registration Statement is a valid secondary offering and not an
offering “by or on behalf of the issuer” as defined in Rule 415 and that none of the Investors is an “underwriter.” The Investors shall have the right to select one legal counsel to review and oversee any registration or matters
pursuant to this Section 2(e), including participation in any meetings or discussions with the SEC regarding the SEC’s position and to comment on any written submission made to the SEC with respect thereto,
which counsel shall be designated by the holders of a majority of the Registrable Securities. No such written submission with respect to this matter shall be made to the SEC to which the Investors’ counsel reasonably objects. In the event that,
despite the Company’s commercially reasonable efforts and compliance with the terms of this Section 2(e), the SEC refuses to alter its position, the Company shall (i)


  
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remove from such Registration Statement such portion of the Registrable Securities (the “Cut Back Shares”) and/or (ii) agree to such restrictions and limitations on the
registration and resale of the Registrable Securities as the SEC may require to assure the Company’s compliance with the requirements of Rule 415 (collectively, the “SEC Restrictions”); provided, however, that the Company shall
not agree to name any Investor as an “underwriter” in such Registration Statement without the prior written consent of such Investor. Any cut-back imposed on the Investors pursuant to this
Section 2(e) shall be allocated among the Investors on a pro rata basis and shall be applied first to any of the Registrable Securities of such Investor as such Investor shall designate, unless the SEC Restrictions
otherwise require or provide or the Investors otherwise agree. From and after the date on which the Company is able to effect the registration of such Cut Back Shares (such date, the “Restriction Termination Date”), all of the
provisions of this Section 2 (including the Company’s obligations with respect to the filing of a Registration Statement and its obligations to use commercially reasonable efforts to have such Registration Statement
declared effective within the time periods set forth herein) shall again be applicable to such Cut Back Shares; provided, however, that (i) the Filing Deadline for such Registration Statement including such Cut Back Shares shall
be ten (10) Business Days after the Restriction Termination Date, and (ii) the date by which the Company is required to obtain effectiveness with respect to such Cut Back Shares under Section 2(c) shall be
the 90th day immediately after the Restriction Termination Date (or the 120th day if the SEC reviews such Registration Statement). Notwithstanding anything to the contrary in this Section 2, the Company shall not be liable for Liquidated
Damages under this Agreement as to any Registrable Securities which are not permitted by the SEC to be included in a Registration Statement due solely to the SEC Restrictions. In such case, the Liquidated Damages shall be calculated to only apply to
the percentage of Registrable Securities which are permitted in accordance with the SEC Restrictions to be included in such Registration Statement. 
 3.
COMPANY OBLIGATIONS. The Company will use commercially reasonable efforts to effect the registration of the Registrable Securities in accordance with the terms hereof, and pursuant thereto the Company will, as expeditiously as possible: 

(a) use commercially reasonable efforts to cause such Registration Statement to become effective and to remain continuously effective for a
period that will terminate upon the earlier of (i) the second anniversary of the Effective Date, and (ii) the date on which all Registrable Securities covered by such Registration Statement may be sold without restriction or limitation
pursuant to Rule 144 and without the requirement to be in compliance with Rule 144(c)(1) (or any successor thereto) promulgated under the 1933 Act during any ninety (90) day period (the “Effectiveness Period”) and advise the
Investors promptly in writing when the Effectiveness Period has expired; 
 (b) prepare and file with the SEC such amendments and
post-effective amendments to such Registration Statement and the related Prospectus as may be necessary to keep such Registration Statement effective for the Effectiveness Period and to comply with the provisions of the 1933 Act and the 1934 Act
with respect to the distribution of all of the Registrable Securities covered thereby; 

  
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 (c) provide copies to and permit the Investors to review each Registration Statement and all
amendments and supplements thereto not less than five (5) Trading Days prior to the filing of each Registration Statement and not less than one (1) Trading Day prior to the filing of any related Prospectus or any amendment or supplement
thereto (except for Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K and any similar
or successor reports) and not file any document to which such Investor reasonably objects in good faith (it being acknowledged and agreed that if an Investor does not object to or comment on the aforementioned documents within such five
(5) Trading Day or one (1) Trading Day period, as the case may be, then the Investor shall be deemed to have consented to and approved the use of such documents), provided that, the Company is notified of such objection in writing within
the five (5) Trading Day or one (1) Trading Day period described in this Section 3(c), as applicable; 

(d) furnish to each Investor whose Registrable Securities are included in any Registration Statement (i) promptly after the same is
prepared and filed with the SEC, if requested by the Investor, one (1) copy of any Registration Statement and any amendment thereto (provided, that the Company shall have no obligation to provide any document pursuant to this clause that
is available on the SEC’s EDGAR system), each preliminary prospectus and Prospectus and each amendment or supplement thereto, and each letter written by or on behalf of the Company to the SEC or the staff of the SEC, and each item of
correspondence from the SEC or the staff of the SEC, in each case relating to such Registration Statement (other than any portion of any thereof which contains information for which the Company has sought confidential treatment), and (ii) such
number of copies of a Prospectus, including a preliminary prospectus, and all amendments and supplements thereto and such other documents as each Investor may reasonably request in order to facilitate the disposition of the Registrable Securities
owned by such Investor that are covered by such Registration Statement; 
 (e) use commercially reasonable efforts to (i) prevent the
issuance of any stop order or other suspension of effectiveness and, (ii) if such order is issued, obtain the withdrawal of any such order at the earliest practical moment; 

(f) prior to any public offering of Registrable Securities, use commercially reasonable efforts to register or qualify or cooperate with the
Investors and their counsel in connection with the registration or qualification of such Registrable Securities for the offer and sale under the securities or blue sky laws of such jurisdictions requested by the Investors and do any and all other
commercially reasonable acts or things necessary or advisable to enable the distribution in such jurisdictions of the Registrable Securities covered by the Registration Statement; provided, however, that the Company shall not be required in
connection therewith or as a condition thereto to (i) qualify to do business in any jurisdiction where it would not otherwise be required to qualify but for this Section 3(f), (ii) subject itself to general
taxation in any jurisdiction where it would not otherwise be so subject but for this Section 3(f), or (iii) file a general consent to service of process in any such jurisdiction; 

(g) use commercially reasonable efforts to cause all Registrable Securities covered by a Registration Statement to be listed on each securities
exchange, interdealer quotation system or other market on which similar securities issued by the Company are then listed; 
 (h) promptly
notify the Investors, at any time prior to the end of the Effectiveness Period, upon discovery that, or upon the happening of any event as a result of which, the Prospectus includes an untrue statement of a material fact or omits to state any
material fact required to be stated therein or necessary to make the statements therein not misleading in light of the circumstances then existing (a “Misstatement”), and promptly prepare, file with the SEC and furnish to such
holder a supplement to or an amendment of such Prospectus as may be necessary so that such Prospectus shall not include such Misstatement; 

  
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 (i) otherwise use commercially reasonable efforts to comply with all applicable rules and
regulations of the SEC under the 1933 Act and the 1934 Act, including, without limitation, Rule 172 under the 1933 Act, file any final Prospectus, including any supplement or amendment thereof, with the SEC pursuant to Rule 424 under the 1933 Act,
promptly inform the Investors in writing if, at any time during the Effectiveness Period, the Company does not satisfy the conditions specified in Rule 172 and, as a result thereof, the Investors are required to deliver a Prospectus in connection
with any disposition of Registrable Securities and take such other actions as may be reasonably necessary to facilitate the registration of the Registrable Securities hereunder; and make available to its security holders, as soon as reasonably
practicable, but not later than the Availability Date (as defined below), an earnings statement covering a period of at least twelve (12) months, beginning after the effective date of each Registration Statement, which earnings statement shall
satisfy the provisions of Section 11(a) of the 1933 Act, including Rule 158 promulgated thereunder (for the purpose of this Section 3(i), “Availability Date” means the 45th day following
the end of the fourth fiscal quarter that includes the effective date of such Registration Statement, except that, if such fourth fiscal quarter is the last quarter of the Company’s fiscal year, “Availability Date” means the
90th day after the end of such fourth fiscal quarter); and 
 (j) with a view to making available to the Investors the benefits of Rule 144
(or its successor rule) and any other rule or regulation of the SEC that may at any time permit the Investors to sell shares of Common Stock to the public without registration, the Company covenants and agrees to: (i) make and keep public
information available, as those terms are understood and defined in Rule 144, until the earlier of (A) six (6) months after such date as all of the Registrable Securities may be sold without restriction by the holders thereof pursuant to Rule
144 or any other rule of similar effect or (B) such date as all of the Registrable Securities shall have been resold; (ii) file with the SEC in a timely manner all reports and other documents required of the Company under the 1934 Act;
(iii) prior to the filing of any Registration Statement or any amendment thereto (whether pre-effective or post-effective) and prior to the filing of any Prospectus, provide to each Investor copies of all
pages thereof (if any) that reference such Investors, and (iv) furnish to each Investor upon request, as long as such Investor owns any Registrable Securities, (A) a written statement by the Company that it has complied with the reporting
requirements of the 1934 Act, (B) a copy of the Company’s most recent Annual Report on Form 10-K or Quarterly Report on Form 10-Q, and (C) such other
information as may be reasonably requested in order to avail such Investor of any rule or regulation of the SEC that permits the selling of any such Registrable Securities without registration. 

4. OBLIGATION OF THE INVESTORS. 
 (a) Each
Investor agrees to furnish to the Company a completed Selling Investor Questionnaire on the Effective Date. At least ten (10) Trading Days prior to the first anticipated filing date of a Registration Statement for any registration under this
Agreement, the Company will notify each Investor of the information the Company requires from that Investor other than the information contained in the Selling Investor Questionnaire, if any, which shall be completed


  
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and delivered to the Company promptly upon request and, in any event, within three (3) Trading Days prior to the applicable anticipated filing date. Each Investor further agrees that it
shall not be entitled to be named as a selling securityholder in the Registration Statement or use the Prospectus for offers and resales of Registrable Securities at any time, unless such Investor has returned to the Company a completed and signed
Selling Investor Questionnaire and a response to any reasonable requests for further information as described in the previous sentence. If an Investor returns a Selling Investor Questionnaire or a request for further information, in either case,
after its respective deadline, the Company shall use its reasonable best efforts to take such actions as are required to name such Investor as a selling security holder in the Registration Statement or any
pre-effective or post-effective amendment thereto and to include (to the extent not theretofore included) in the Registration Statement the Registrable Securities identified in such late Selling Investor
Questionnaire or request for further information. Each Investor acknowledges and agrees that the information in the Selling Investor Questionnaire or request for further information as described in this Section 4(a)
will be used by the Company in the preparation of the Registration Statement and hereby consents to the inclusion of such information in the Registration Statement. 

(b) Each Investor shall furnish in writing to the Company such information regarding itself, the Registrable Securities held by it and the
intended method of disposition of the Registrable Securities held by it, as shall be reasonably required to effect the registration of such Registrable Securities and shall execute such documents in connection with such registration as the Company
may reasonably request. At least ten (10) Business Days prior to the first anticipated filing date of any Registration Statement, the Company shall notify each Investor of the information the Company requires from such Investor if such Investor
elects to have any of the Registrable Securities included in such Registration Statement. An Investor shall provide such information to the Company at least two (2) Business Days prior to the first anticipated filing date of such Registration
Statement if such Investor elects to have any of the Registrable Securities included in such Registration Statement. 
 (c) Each Investor, by
its acceptance of the Registrable Securities, agrees to cooperate with the Company as reasonably requested by the Company in connection with the preparation and filing of a Registration Statement hereunder, unless such Investor has notified the
Company in writing of its election to exclude all of its Registrable Securities from such Registration Statement. 
 (d) Each Investor agrees
that, upon receipt of any notice from the Company of either (i) the commencement of an Allowed Delay pursuant to Section 2(c)(i) or (ii) the happening of an event pursuant to
Section 3(h) hereof, such Investor will immediately discontinue disposition of Registrable Securities pursuant to any Registration Statement covering such Registrable Securities, until the Investor is advised by the Company
that such dispositions may again be made. 
 (e) Each Investor covenants and agrees that it will comply with the prospectus delivery
requirements of the 1933 Act as applicable to it or an exemption therefrom in connection with sales of Registrable Securities pursuant to any Registration Statement. 

  
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 5. INDEMNIFICATION. 

(a) (a) Indemnification by the Company. The Company agrees to indemnify and hold harmless each Investor, and each of their respective
officers, employees, Affiliates, directors, partners, members, equityholders, attorneys, advisors and agents, and each person or entity, if any, who controls (within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act)
each Investor (each, an “Investor Indemnified Party”), to the fullest extent permitted by applicable law, from and against any expenses, losses, judgments, actions, claims, proceedings (whether commenced or threatened), damages,
liabilities or costs (including, without limitation, reasonable attorneys’ fees), whether joint or several (collectively, “Losses”), as incurred, arising out of or based upon any Misstatement contained in any Registration
Statement under which the sale of such Registrable Securities was Registered under the 1933 Act, any preliminary Prospectus, final Prospectus or summary Prospectus contained in such Registration Statement, or any amendment or supplement to such
Registration Statement, preliminary Prospectus, final Prospectus or summary Prospectus, or any violation by the Company of the 1933 Act or any rule or regulation promulgated thereunder applicable to the Company and relating to action or inaction
required of the Company in connection with any such Registration; and the Company shall promptly reimburse the Investor Indemnified Party for any reasonable, customary and documented
out-of-pocket legal and any other expenses incurred, as incurred, by such Investor Indemnified Party in connection with investigating and defending any such Losses,
except, with respect to any Investor of Registrable Securities, to the extent such Investor Securities is liable to indemnify the Company for such Losses pursuant to Section 5(b). 

(b) Indemnification by Investors. Each Investor will, in the event that any Registration is being effected under the 1933 Act pursuant
to this Agreement of any Registrable Securities held by such Investor and the Company has required all Selling Investors to provide such an undertaking on the same terms, indemnify and hold harmless the Company, each of its directors and officers
and each underwriter (if any), and each other Selling Investor and each other person, if any, who controls another Selling Investor or such underwriter within the meaning of the 1933 Act, against any Losses, insofar as such Losses arise out of or
are based upon any Misstatement contained in any Registration Statement under which the sale of such Registrable Securities was Registered under the 1933 Act, any preliminary Prospectus, final Prospectus or summary Prospectus contained in the
Registration Statement, or any amendment or supplement thereto, if the Misstatement was made in reliance upon and in conformity with information furnished in writing to the Company by such Selling Investor expressly for use therein, and shall
reimburse the Company, its directors and officers, and each other Selling Investor for any reasonable, customary and documented out-of-pocket legal or other expenses
incurred by any of them in connection with investigation or defending any such Loss. Each Selling Investor’s indemnification obligations hereunder shall be several and not joint and shall be proportional to and limited to the amount of any net
proceeds actually received by such Selling Investor in connection with the sale of Registrable Securities under a Registration Statement from which such Losses arise. 

(c) Conduct of Indemnification Proceedings. Promptly after receipt by any person of any notice of any Loss in respect of which indemnity
may be sought pursuant to Section 5(a) or 5(b), such person (the “Indemnified Party”) shall, if a claim in respect thereof is to be made against any other person for indemnification hereunder,
notify such other person (the “Indemnifying Party”) in writing of the Loss; provided, however, that the failure by the Indemnified Party to 

  
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notify the Indemnifying Party shall not relieve the Indemnifying Party from any liability which the Indemnifying Party may have to such Indemnified Party hereunder, except and solely to the
extent the Indemnifying Party is actually and materially prejudiced by such failure. If the Indemnified Party is seeking indemnification with respect to any claim or action brought against the Indemnified Party, then the Indemnifying Party shall be
entitled to participate in such claim or action, and, to the extent that it wishes, jointly with all other Indemnifying Parties, to assume control of the defense thereof with counsel reasonably satisfactory to the Indemnified Party. After notice
from the Indemnifying Party to the Indemnified Party of its election to assume control of the defense of such claim or action, the Indemnifying Party shall not be liable to the Indemnified Party for any legal or other expenses subsequently incurred
by the Indemnified Party in connection with the defense thereof; provided, however, that in any action in which both the Indemnified Party and the Indemnifying Party are named as defendants, the Indemnified Party shall have the right
to employ separate counsel (but no more than one such separate counsel, in addition to local counsel) to represent the Indemnified Party and its controlling persons who may be subject to liability arising out of any claim in respect of which
indemnity may be sought by the Indemnified Party against the Indemnifying Party, with the reasonable, customary and documented fees and expenses of such counsel to be paid by such Indemnifying Party if, based upon the written opinion of counsel of
such Indemnified Party, representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. No Indemnifying Party shall, without the prior written consent of the Indemnified Party
(not to be unreasonably withheld, conditioned or delayed), consent to entry of judgment or effect any settlement of any claim or pending or threatened proceeding in respect of any Losses for which the Indemnified Party seeks indemnification
hereunder if such settlement or judgment includes any non-monetary remedies binding on the Indemnified Party, requires an admission of fault or culpability on the part of the Indemnified Party or does not
include an unconditional release from all liability of the Indemnified Party in respect of such Losses. 
 (d) Contribution. If the
indemnification provided for in the foregoing Sections 5(a) and 5(b) is unavailable to any Indemnified Party in respect of any Loss referred to herein, then each such Indemnifying Party, in lieu of indemnifying such Indemnified
Party, shall contribute to the amount paid or payable by such Indemnified Party as a result of such Loss in such proportion as is appropriate to reflect the relative fault of the Indemnified Parties and the Indemnifying Parties in connection with
the actions or omissions which resulted in such Loss. The relative fault of any Indemnified Party and any Indemnifying Party shall be determined by reference to, among other things, whether the Misstatement relates to information supplied by such
Indemnified Party or such Indemnifying Party (in the case of a Holder, such Misstatement was made in reliance upon and in conformity with information furnished in writing to the Company by such Holder expressly for use therein) and the parties’
relative intent, knowledge, access to information and opportunity to correct or prevent such Misstatement. The parties hereto agree that it would not be just and equitable if contribution pursuant to this
Section 5(d) were determined by pro rata allocation or by any other method of allocation which does not take account of the equitable considerations referred to in this
Section 5(d). The amount paid or payable by an Indemnified Party as a result of any Loss referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any
legal or other expenses incurred by such Indemnified Party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 5(d), no Investor shall be required to
contribute any amount in excess of the dollar amount of the net proceeds (after payment of any underwriting fees, discounts, 

  
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commissions or taxes) actually received by such Investor from the sale of Registrable Securities which gave rise to such contribution obligation. No person guilty of fraudulent misrepresentation
(within the meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. 

6. MISCELLANEOUS. 
 (a) Effective Date.
This Agreement shall be effective as of the Effective Date. 
 (b) Amendments and Waivers. This Agreement may be amended only by a
writing signed by the Company and the Required Investors. The Company may take any action herein prohibited, or omit to perform any act herein required to be performed by it, only if the Company shall have obtained the written consent to such
amendment, action or omission to act, of the Required Investors. Notwithstanding the foregoing, this Agreement may not be amended and the observance of any term of this Agreement may not be waived with respect to any Investor without the written
consent of such Investor unless such amendment or waiver applies to all Investors in the same fashion. 
 (c) Notices. All notices and
other communications provided for or permitted hereunder shall be made as set forth in Section 6.06 of the Securities Purchase Agreement. 

(d) Assignments and Transfers by Investors. The provisions of this Agreement shall be binding upon and inure to the benefit of the
Investors and their respective successors and assigns. An Investor may transfer or assign, in whole or from time to time in part, to one or more persons its rights hereunder in connection with the transfer of Registrable Securities by such Investor
to such person, provided that such Investor complies with all laws applicable thereto, and the provisions of the Securities Purchase Agreement, and provides written notice of assignment to the Company promptly after such assignment is effected, and
such person agrees in writing to be bound by all of the provisions contained herein. 
 (e) Assignments and Transfers by the Company.
This Agreement may not be assigned by the Company (whether by operation of law or otherwise) without the prior written consent of the Required Investors, provided, however, that in the event that the Company is a party to a merger, consolidation,
share exchange or similar business combination transaction in which the Common Stock is converted into the equity securities of another Person, from and after the effective time of such transaction, such Person shall, by virtue of such transaction,
be deemed to have assumed the obligations of the Company hereunder, the term “Company” shall be deemed to refer to such Person and the term “Registrable Securities” shall be deemed to include the securities received by the
Investors in connection with such transaction unless such securities are otherwise freely tradable by the Investors after giving effect to such transaction. 

(f) Benefits of the Agreement. The terms and conditions of this Agreement shall inure to the benefit of and be binding upon the
respective permitted successors and assigns of the parties. Nothing in this Agreement, express or implied, is intended to confer upon any party other than the parties hereto or their respective successors and assigns any rights, remedies,
obligations, or liabilities under or by reason of this Agreement, except as expressly provided in this Agreement. 

  
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 (g) Counterparts; Execution. This Agreement may be executed in two or more
counterparts, each of which shall be deemed an original, but all of which together shall constitute one and the same instrument. A PDF or other reproduction of this Agreement may be executed by one or more parties hereto, and an executed copy of
this Agreement may be delivered by one or more parties hereto by e-mail or other electronic transmission device pursuant to which the signature of or on behalf of such party can be seen, and such execution and
delivery shall be considered legal, valid, binding and effective for all purposes. The parties hereto hereby agree that no party shall raise the execution of a PDF or other reproduction of this Agreement, or the fact that any signature or document
was transmitted or communicated by e-mail or other electronic transmission device, as a defense to the formation of this Agreement. 

(h) Headings. The headings of this Agreement are for convenience of reference and shall not form part of, or affect the interpretation
of, this Agreement. 
 (i) Severability. If any provision of this Agreement shall be invalid or unenforceable in any jurisdiction,
such invalidity or unenforceability shall not affect the validity or enforceability of the remainder of this Agreement in that jurisdiction or the validity or enforceability of any provision of this Agreement in any other jurisdiction. The parties
will endeavor in good faith negotiations to replace the prohibited, invalid or unenforceable provision(s) with a valid provision(s), the effect of which comes as close as possible to that of the prohibited, invalid or unenforceable provision(s).

 (j) Further Assurances. The parties shall execute and deliver all such further instruments and documents and take all such other
actions as may reasonably be required to carry out the transactions contemplated hereby and to evidence the fulfillment of the agreements herein contained. 

(k) No Strict Construction. The language used in this Agreement will be deemed to be the language chosen by the parties thereto express
their mutual intent, and no rules of strict construction will be applied against any party. 
 (l) Entire Agreement. This Agreement is
intended by the parties as a final expression of their agreement and intended to be a complete and exclusive statement of the agreement and understanding of the parties hereto in respect of the subject matter contained herein. This Agreement
supersedes all prior agreements and understandings between the parties with respect to such subject matter. 
 (m) Governing Law; Consent
to Jurisdiction; Waiver of Jury Trial. All questions concerning the construction, validity, enforcement and interpretation of this Agreement shall be governed by the internal laws of the State of Delaware, without giving effect to any choice of
law or conflict of law provision or rule (whether of the State of Delaware or any other jurisdiction) that would cause the application of the laws of any jurisdiction other than the State of Delaware. Each party hereby irrevocably submits to the
exclusive jurisdiction of the courts of the State of Delaware for the adjudication of any dispute hereunder or in connection herewith or with any transaction contemplated hereby or discussed herein, and hereby irrevocably waives, and agrees not to
assert in any suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such suit, action or proceeding is brought in an inconvenient forum or that the


  
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venue of such suit, action or proceeding is improper. Each party hereby irrevocably waives personal service of process and consents to process being served in any such suit, action or proceeding
by mailing a copy thereof to such party at the address for such notices to it under this Agreement and agrees that such service shall constitute good and sufficient service of process and notice thereof. Nothing contained herein shall be deemed to
limit in any way any right to serve process in any manner permitted by law. EACH OF THE PARTIES HERETO IRREVOCABLY WAIVES ANY RIGHT TO REQUEST A TRIAL BY JURY FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION HEREWITH OR ARISING OUT OF
THIS AGREEMENT AND REPRESENTS THAT COUNSEL HAS BEEN CONSULTED SPECIFICALLY AS TO THIS WAIVER. 
 [remainder of page intentionally left blank]


  
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 IN WITNESS WHEREOF, the parties have executed this Agreement or caused their duly
authorized officers to execute this Agreement as of the date first above written. 
  

			
	COMPANY:
	
	LARIMAR THERAPEUTICS, INC.
		
	By:	 	 /s/ Carole Ben-Maimon, M.D.

	Name: Carole Ben-Maimon, M.D.
	Title: President and Chief Executive Officer


 [Signature Page to Registration Rights Agreement] 











 EXHIBIT A 

Plan of Distribution 
 The selling
stockholders, which as used herein includes donees, pledgees, transferees or other successors-in-interest selling shares of common stock or interests in shares of common
stock received after the date of this prospectus from a selling stockholder as a gift, pledge, partnership distribution or other transfer, may, from time to time, sell, transfer or otherwise dispose of any or all of their shares of common stock or
interests in shares of common stock on any stock exchange, market or trading facility on which the shares are traded or in private transactions. These dispositions may be at fixed prices, at prevailing market prices at the time of sale, at prices
related to the prevailing market price, at varying prices determined at the time of sale, or at negotiated prices. 
 The selling stockholders may use any
one or more of the following methods when disposing of shares or interests therein: 
  

	 	•	 	 ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers;



  

	 	•	 	 block trades in which the broker-dealer will attempt to sell the shares as agent, but may position and resell a
portion of the block as principal to facilitate the transaction; 


  

	 	•	 	 purchases by a broker-dealer as principal and resale by the broker-dealer for its account; 



 

	 	•	 	 an exchange distribution in accordance with the rules of the applicable exchange; 



 

	 	•	 	 privately negotiated transactions; 



 

	 	•	 	 short sales effected after the date the registration statement of which this prospectus is a part is declared
effective by the SEC; 


  

	 	•	 	 through the writing or settlement of options or other hedging transactions, whether through an options exchange
or otherwise; 


  

	 	•	 	 broker-dealers may agree with the selling stockholders to sell a specified number of such shares at a stipulated
price per share; 


  

	 	•	 	 a combination of any such methods of sale; and 



 

	 	•	 	 any other method permitted by applicable law. 



The selling stockholders may, from time to time, pledge or grant a security interest in some or all of the shares of common stock owned by them and, if they
default in the performance of their secured obligations, the pledgees or secured parties may offer and sell the shares of common stock, from time to time, under this prospectus, or under an amendment to this prospectus under Rule 424(b)(3) or other
applicable provision of the 1933 Act amending the list of selling stockholders to include the pledgee, transferee or other successors in interest as selling stockholders under this prospectus. The selling stockholders also may transfer the shares of
common stock in other circumstances, in which case the transferees, pledgees or other successors in interest will be the selling beneficial owners for purposes of this prospectus. 











 In connection with the sale of our common stock or interests therein, the selling stockholders may enter
into hedging transactions with broker-dealers or other financial institutions, which may in turn engage in short sales of the common stock in the course of hedging the positions they assume. The selling stockholders may also sell shares of our
common stock short and deliver these securities to close out their short positions, or loan or pledge the common stock to broker-dealers that in turn may sell these securities. The selling stockholders may also enter into option or other
transactions with broker-dealers or other financial institutions or the creation of one or more derivative securities which require the delivery to such broker-dealer or other financial institution of shares offered by this prospectus, which shares
such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended to reflect such transaction). 
 The
aggregate proceeds to the selling stockholders from the sale of the common stock offered by them will be the purchase price of the common stock less discounts or commissions, if any. Each of the selling stockholders reserves the right to accept and,
together with their agents from time to time, to reject, in whole or in part, any proposed purchase of common stock to be made directly or through agents. We will not receive any of the proceeds from this offering. Upon any exercise of the warrants
by payment of cash, however, we will receive the exercise price of the warrants. 
 The selling stockholders also may resell all or a portion of the shares
in open market transactions in reliance upon Rule 144 under the 1933 Act, provided that they meet the criteria and conform to the requirements of that rule. 

The selling stockholders and any underwriters, broker-dealers or agents that participate in the sale of the common stock or interests therein may be
“underwriters” within the meaning of Section 2(11) of the 1933 Act. Any discounts, commissions, concessions or profit they earn on any resale of the shares may be underwriting discounts and commissions under the 1933 Act. Selling
stockholders who are “underwriters” within the meaning of Section 2(11) of the 1933 Act will be subject to the prospectus delivery requirements of the 1933 Act. 

To the extent required, the shares of our common stock to be sold, the names of the selling stockholders, the respective purchase prices and public offering
prices, the names of any agents, dealer or underwriter, any applicable commissions or discounts with respect to a particular offer will be set forth in an accompanying prospectus supplement or, if appropriate, a post-effective amendment to the
registration statement that includes this prospectus. 
 In order to comply with the securities laws of some states, if applicable, the common stock may be
sold in these jurisdictions only through registered or licensed brokers or dealers. In addition, in some states the common stock may not be sold unless it has been registered or qualified for sale or an exemption from registration or qualification
requirements is available and is complied with. 











 We have advised the selling stockholders that the anti-manipulation rules of Regulation M under the 1934 Act
may apply to sales of shares in the market and to the activities of the selling stockholders and their Affiliates. In addition, to the extent applicable we will make copies of this prospectus (as it may be supplemented or amended from time to time)
available to the selling stockholders for the purpose of satisfying the prospectus delivery requirements of the 1933 Act. The selling stockholders may indemnify any broker-dealer that participates in transactions involving the sale of the shares
against certain liabilities, including liabilities arising under the 1933 Act. 
 We have agreed to indemnify the selling stockholders against liabilities,
including liabilities under the 1933 Act and state securities laws, relating to the registration of the shares offered by this prospectus. 
 We have agreed
with the selling stockholders to keep the registration statement of which this prospectus constitutes a part effective until the earlier of (1) such time as all of the shares covered by this prospectus have been disposed of pursuant to and in
accordance with such registration statement or (2) the date on which all of the shares may be sold without restriction pursuant to Rule 144 of the 1933 Act. 











 EXHIBIT B 

Form of Selling Investor Questionnaire 

[See attached.]