# EDGAR Filing Document

**Accession Number:** 0001849867
**File Stem:** 0001885818-25-000003
**Filing Date:** 2025-10
**Character Count:** 7108
**Document Hash:** 5ee028db5705a52d04703661aa0cfa2f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001885818-25-000003.hdr.sgml**: 20251030

**ACCESSION NUMBER**: 0001885818-25-000003

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20251028

**FILED AS OF DATE**: 20251030

**DATE AS OF CHANGE**: 20251030

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Kleiser Kirk E.
- **CENTRAL INDEX KEY:** 0001885818

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-40893
- **FILM NUMBER:** 251435711

**MAIL ADDRESS:**
- **STREET 1:** CATALYST BANCORP, INC.
- **STREET 2:** 235 N. COURT ST.
- **CITY:** OPELOUSAS
- **STATE:** LA
- **ZIP:** 70570
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Catalyst Bancorp, Inc.
- **CENTRAL INDEX KEY:** 0001849867
- **STANDARD INDUSTRIAL CLASSIFICATION:** SAVINGS INSTITUTION, FEDERALLY CHARTERED [6035]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 862411762

**BUSINESS ADDRESS:**
- **STREET 1:** 235 N. COURT STREET
- **CITY:** OPELOUSAS
- **STATE:** LA
- **ZIP:** 70570
- **BUSINESS PHONE:** 337-948-3033

**MAIL ADDRESS:**
- **STREET 1:** 235 N. COURT STREET
- **CITY:** OPELOUSAS
- **STATE:** LA
- **ZIP:** 70570

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] 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**<sup>*</sup><br>Kleiser Kirk E.<br><sub>(Last) (First) (Middle)</sub><br>C/O CATALYST BANCORP INC<br>235 N COURT ST<br><sub>(Street)</sub><br>OPELOUSAS, LA 70570<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2025-10-28 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Catalyst Bancorp, Inc. [ CLST ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2025-10-28 |  | S |  | 1500 | D | $13.43 | 3250 | I | By Kleiser Enterprises Corporation |
| Common Stock | 2025-10-28 |  | S |  | 2500 | D | $13.39 | 750 | I | By Kleiser Enterprises Corporation |
| Common Stock | 2025-10-28 |  | S |  | 750 | D | $13.3974 | 0 | I | By Kleiser Enterprises Corporation |
| Common Stock | 2025-10-28 |  | P |  | 100 | A | $13.40 | 13099 | I | By IRA |
| Common Stock | 2025-10-28 |  | P |  | 4650 | A | $13.4099 | 17749 | I | By IRA |
| Common Stock |  |  |  |  |  |  |  | 24522<sup>(1)</sup> | D |  |
| Common Stock |  |  |  |  |  |  |  | 1000<sup>(2)</sup> | I | By K & G On the Geaux LLC |
| Common Stock |  |  |  |  |  |  |  | 5000<sup>(3)</sup> | I | By K Kleiser LLC |
| Common Stock |  |  |  |  |  |  |  | 3100 | I | By Spouse in IRA |
| Common Stock |  |  |  |  |  |  |  | 900 | I | By Spouse |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Stock Option (Right to Buy) | $13.30 |  |  |  |  |  |  | <sup>(4)</sup> | 2032-09-01 | Common Stock | 21160 |  | 21160 | D |  |
| Stock Option (Right to Buy) | $12.08 |  |  |  |  |  |  | <sup>(5)</sup> | 2035-06-10 | Common Stock | 2645 |  | 2645 | D |  |

---

### Footnotes:

(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.

**Signature:** /s/ Jutta Codori by P.O.A. for Kirk E. Kleiser  
**Date:** 2025-10-30

### Remarks:

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.**