[Form 4] Catalyst Bancorp, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Catalyst Bancorp (CLST) director Kirk E. Kleiser reported insider trades on 10/28/2025. Indirect holdings via Kleiser Enterprises Corporation sold 1,500 shares at $13.43, 2,500 at $13.39, and 750 at $13.3974. The reporting person also purchased 100 shares at $13.4 and 4,650 shares at $13.4099 through an IRA.

Post‑trade holdings include 24,522 direct shares and 17,749 shares held indirectly via IRA, plus 1,000 via K & G On the Geaux LLC, 5,000 via K Kleiser LLC, 3,100 via spouse’s IRA, and 900 via spouse. Derivatives listed include stock options for 21,160 shares at $13.3 (expire 09/01/2032) and 2,645 shares at $12.08 (expire 06/10/2035), each vesting 20% per year per their stated schedules.

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^*

Kleiser Kirk E.

(Last) (First) (Middle)

C/O CATALYST BANCORP INC

235 N COURT ST

(Street)

OPELOUSAS LA 70570

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Catalyst Bancorp, Inc. [ CLST ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
10/28/2025

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

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

X	Form filed by One Reporting Person
	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	10/28/2025		S		1,500	D	$13.43	3,250	I	By Kleiser Enterprises Corporation
Common Stock	10/28/2025		S		2,500	D	$13.39	750	I	By Kleiser Enterprises Corporation
Common Stock	10/28/2025		S		750	D	$13.3974	0	I	By Kleiser Enterprises Corporation
Common Stock	10/28/2025		P		100	A	$13.4	13,099	I	By IRA
Common Stock	10/28/2025		P		4,650	A	$13.4099	17,749	I	By IRA
Common Stock								24,522(1)	D
Common Stock								1,000(2)	I	By K & G On the Geaux LLC
Common Stock								5,000(3)	I	By K Kleiser LLC
Common Stock								3,100	I	By Spouse in IRA
Common Stock								900	I	By Spouse

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
Stock Option (Right to Buy)	$13.3							(4)	09/01/2032	Common Stock	21,160		21,160	D
Stock Option (Right to Buy)	$12.08							(5)	06/10/2035	Common Stock	2,645		2,645	D

Explanation of Responses:

1. Includes 3,384 shares granted pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that reflect the unvested portion of a grant amount originally covering 8,464 shares that commenced vesting 20% per year on September 1, 2023.

2. The 1,000 shares are held by the K&G On the GEAUX LLC of which the reporting person is a senior managing member and 60% owner.

3. The 5,000 shares are held by the K Kleiser LLC of which the reporting person is the sole member.

4. The options are vesting at a rate of 20% per year commenced on September 1, 2023.

5. The options vest at a rate of 20% per year commencing on June 10, 2026.

	/s/ Jutta Codori by P.O.A. for Kirk E. Kleiser	10/30/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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