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: Zanco Joseph B (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-09-01	Common Stock	F	1158	$12.83	Disposed	32870	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	15000	Indirect
Common Stock	2458.9121	Indirect
Common Stock	6474.1176	Indirect
Common Stock	22009	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Stock Option (Right to Buy)	$13.30	2032-09-01	Common Stock (52900)	52900	Direct
Stock Option (Right to Buy)	$12.08	2035-06-10	Common Stock (13225)	13225	Direct

Footnotes

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

F2: Includes 8,464 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 21,160 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.