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

Rhea-AI Filing Summary

Catalyst Bancorp director Kirk E. Kleiser reported multiple transactions in Catalyst Bancorp, Inc. common stock. On June 10, 2026, entities associated with him made open-market purchases totaling 6,200 shares at prices around $16.09 per share across direct and IRA accounts.

Related LLCs associated with Kleiser sold a combined 6,000 shares at $16.035 per share, resulting in a small net increase in his overall reported holdings. He also received a grant of 1,058 shares at no cost under the 2022 Recognition and Retention Plan, vesting 20% annually starting on June 10, 2027.

Kleiser continues to hold stock options covering 26,450 shares of common stock at exercise prices of $12.08, $13.30, and $15.96, expiring between 2032 and 2036. These options and prior plan grants vest at 20% per year according to the disclosed schedules.

Insider Trade Summary

Net Buyer: 200 shares ($99,893)

Net Buy 10 txns

Insider Kleiser Kirk E.

Role null

Bought 6,200 shs ($100K)

Sold 6,000 shs ($96K)

Type	Security	Shares	Price	Value
Sale	Common Stock	5,000	$16.035	$80K
Sale	Common Stock	1,000	$16.035	$16K
Grant/Award	Common Stock	1,058	$0.00	--
Purchase	Common Stock	2,850	$16.1345	$46K
Purchase	Common Stock	2,350	$16.0851	$38K
Purchase	Common Stock	1,000	$16.1099	$16K
holding	Stock Option (Right to Buy)	--	--	--
holding	Stock Option (Right to Buy)	--	--	--
holding	Stock Option (Right to Buy)	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 0 shares (Indirect, By K Kleiser LLC); Common Stock — 25,580 shares (Direct, null); Stock Option (Right to Buy) — 21,160 shares (Direct, null)

Footnotes (1)

1. Represents the grant of shares pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that vest at 20% per year commencing on June 10, 2027. Includes 847 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 1,058 shares that commenced vesting 20% per year on June 10, 2026. Includes 3,388 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. The options are vesting at a rate of 20% per year commenced on September 1, 2023. The options are vesting at a rate of 20% per year commenced on June 10, 2026. The options vest at a rate of 20% per year commencing on June 10, 2027.

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Form 4 Insider Transactions: What Each Field Means →

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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 LOUISIANA 70570

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/10/2026

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

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

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

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	06/10/2026		S		5,000	D	$16.035	0	I	By K Kleiser LLC
Common Stock	06/10/2026		S		1,000	D	$16.035	0	I	By K & G On the Geaux LLC
Common Stock	06/10/2026		A(1)		1,058	A	$0	25,580	D
Common Stock	06/10/2026		P		2,850	A	$16.1345	28,430(2)(3)	D
Common Stock	06/10/2026		P		2,350	A	$16.0851	20,099	I	By IRA
Common Stock	06/10/2026		P		1,000	A	$16.1099	4,100	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
Stock Option (Right to Buy)	$15.96							(6)	06/10/2036	Common Stock	2,645		2,645	D

Explanation of Responses:

1. Represents the grant of shares pursuant to the Issuer's 2022 Recognition and Retention Plan and Trust Agreement that vest at 20% per year commencing on June 10, 2027.

2. Includes 847 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 1,058 shares that commenced vesting 20% per year on June 10, 2026.

3. Includes 3,388 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.

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

5. The options are vesting at a rate of 20% per year commenced on June 10, 2026.

6. The options vest at a rate of 20% per year commencing on June 10, 2027.

	/s/ Jutta Codori by P.O.A. for Kirk E. Kleiser	06/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)