Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES 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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1. Name and Address of Reporting Person * Kleiser Kirk E. 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) (Last) (First) (Middle) C/O CATALYST BANCORP INC, 235 N COURT ST 3. Date of Earliest Transaction (Month/Day/Year) 10/28/2025 (Street) OPELOUSAS, LA 70570 4. If Amendment, Date 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 (City) (State) (Zip) 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

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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 Underlying Securities (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 of Derivative Security: 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

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Kleiser Kirk E. C/O CATALYST BANCORP INC 235 N COURT ST OPELOUSAS, LA 70570	X

Signatures

/s/ Jutta Codori by P.O.A. for Kirk E. Kleiser		10/30/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(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.

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