[Form 4] Larimar Therapeutics, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Form 4 shows CSW Industrials (CSWI) director Robert M. Swartz sold a total of 200 common shares on 1 Aug 2025 through a Rule 10b5-1 plan adopted 10 Sep 2024. The two open-market trades were 100 shares at $250.46 and 100 shares at $250.28, generating roughly $50.1 k in proceeds.

After these sales Swartz’s direct holdings declined from 12,519 to 12,319 shares, a modest 1.6 % reduction. No derivative transactions or additional changes were disclosed. The filing updates beneficial ownership but does not signal any shift in CSWI’s operating outlook.

Insights

Securities Analyst

TL;DR Routine 200-share sale under 10b5-1; negligible impact on ownership or valuation.

The disposal equals about 1.6 % of Swartz’s stake and a fraction of CSWI’s 15 m share float. Rule 10b5-1 pre-planning indicates the trade was scheduled, mitigating signalling risk. Volume and value are immaterial; therefore, I see no valuation impact and maintain a neutral stance.

Corporate Governance Expert

TL;DR Compliance appears sound; minor insider sale, executed transparently.

The filing contains a manual signature, cites a valid 10b5-1 plan and reports within two business days, meeting Section 16 obligations. Sale size is de minimis relative to total holdings, suggesting normal liquidity management rather than adverse insider sentiment. Governance risk unchanged.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Flynn James E

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Larimar Therapeutics, Inc. [ LRMR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

3. Date of Earliest Transaction (Month/Day/Year)
07/31/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	07/31/2025		P		3,387,529	A	$3.2	9,538,918	I	Through Deerfield Private Design Fund III, L.P.(1)(2)
Common Stock	07/31/2025		P		3,387,539	A	$3.2	9,538,945	I	Through Deerfield Private Design Fund IV, L.P.(1)(2)
Common Stock	07/31/2025		P		2,599,932	A	$3.2	7,321,129	I	Through Deerfield Healthcare Innovations Fund, L.P.(1)(2)
Common Stock								4,207,982	I	Through Deerfield Partners, L.P.(1)(2)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

Flynn James E

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

DEERFIELD MANAGEMENT COMPANY, L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

Deerfield Mgmt III, L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

Deerfield Mgmt HIF, L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

Deerfield Mgmt IV, L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

Deerfield Mgmt L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

Deerfield Private Design Fund III, L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

Deerfield Healthcare Innovations Fund, L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

Deerfield Private Design Fund IV, L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

1. Name and Address of Reporting Person^*

DEERFIELD PARTNERS, L.P.

(Last) (First) (Middle)

345 PARK AVENUE SOUTH, 12TH FLOOR

(Street)

NEW YORK NY 10010

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)	X	Other (specify below)
			* Director by Deputization

Explanation of Responses:

1. This Form 4 is being filed by the undersigned as well as the entities listed on the Joint Filer Information Statement attached as an exhibit hereto (the "Reporting Persons"). Deerfield Mgmt III, L.P. is the general partner of Deerfield Private Design Fund III, L.P. ("Fund III"). Deerfield Mgmt IV, L.P. is the general partner of Deerfield Private Design Fund IV, L.P. ("Fund IV"). Deerfield Mgmt HIF, L.P. is the general partner of Deerfield Healthcare Innovations Fund, L.P. ("Deerfield HIF"). Deerfield Mgmt, L.P. is the general partner of Deerfield Partners, L.P. ("Deerfield Partners"). Deerfield Management Company, L.P. is the investment manager of Deerfield Partners, L.P., Fund III, Fund IV and Deerfield HIF (collectively, the "Funds"). James E. Flynn is the sole manager of the general partner of each of Deerfield Mgmt III, L.P., Deerfield Mgmt IV, L.P., Deerfield Mgmt HIF, L.P., Deerfield Mgmt, L.P. and Deerfield Management Company, L.P.

2. In accordance with Instruction 4 (b)(iv) to Form 4, the entire amount of the Issuer's securities held by the Funds is reported herein. For purposes of Section 16 of the Securities Exchange Act of 1934, as amended, each Reporting Person disclaims beneficial ownership of any such securities, except to the extent of his/its indirect pecuniary interest therein, if any, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of such securities for purposes of Section 16 or otherwise.

Remarks:

Jonathan S. Leff, a partner in Deerfield Management, serves as a director of the Issuer. Jonathan Isler, Attorney-in-Fact: Power of Attorney, which is hereby incorporated by reference to Exhibit 24 to a Form 3 with regard to BiomX Inc. filed with the Securities and Exchange Commission on March 19, 2024 by Deerfield Private Design Fund V, L.P., Deerfield Healthcare Innovations Fund II, L.P., Deerfield Mgmt V, L.P., Deerfield Mgmt HIF II, L.P., Deerfield Management Company, L.P. and James E. Flynn.

	/s/ Jonathan Isler, Attorney-in-Fact	08/04/2025
	** Signature of Reporting Person	Date
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