Form 4 Filing for Kirk E. Kleiser at Catalyst Bancorp, Inc.

This filing details transactions made by Kirk E. Kleiser, a director at Catalyst Bancorp, Inc. On September 16, 2026, Mr. Kleiser acquired 529 shares of Common Stock at a price of $12.08 per share, and an additional 16,928 shares at $13.30 per share. These transactions are related to the exercise of stock options. Following these transactions, Mr. Kleiser directly holds 45,887 shares and 45,358 shares respectively. Additionally, the filing reports holdings in an IRA, a spouse's IRA, and a spouse's direct holdings, totaling 20,099, 4,100, and 900 shares respectively. Vesting schedules for options and shares are detailed in the footnotes, with some options vesting at 20% per year commencing in 2026 and 2027, and others commencing in 2023.