Catalyst Bancorp, Inc. — Director's Dealing 2025

Sep 2, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Catalyst Bancorp, Inc. (CLST)
CIK: 0001849867
Period of Report: 2025-09-01

Reporting Person: Bourque Jacques L.J. (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-09-01	Common Stock	F	131	$12.83	Disposed	3597	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	687.9343	Indirect
Common Stock	2040.8886	Indirect
Common Stock	100	Indirect
Common Stock	100	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (Right to Buy)	$13.30	2032-09-01	Common Stock (5000)	5000	Direct
Stock Option (Right to Buy)	$12.08	2035-06-10	Common Stock (4000)	4000	Direct

Footnotes

F1: Disposition solely to meet tax obligation for distribution from stock benefit plan.

F2: Includes 800 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 2,000 shares that commenced vesting 20% per year on September 1, 2023.

F3: Includes shares acquired in the Catalyst Bank 401(k) Plan since the last filed Form 4, based on a report dated August 27, 2025.

F4: Includes shares allocated to the reporting person's account in the ESOP since the last filed Form 4, as of December 31, 2024.

F5: The options are vesting at a rate of 20% per year that commenced on September 1, 2023.

F6: The options vest at a rate of 20% per year commencing on June 10, 2026.