Form 4 Filing by Joseph B. Zanco

Joseph B. Zanco, President and CEO of Catalyst Bancorp, Inc., reported a disposition of 1158 shares of Common Stock on September 1, 2026, for tax obligations related to stock benefit plans. The transaction code was "F" (payment of tax) and the disposal code was "D" (disposition). The price per share was $17.81, and post-transaction shares owned by Zanco are 37002. The filing also details Zanco's indirect holdings, including 15000 shares owned by his spouse, 2996.5955 shares in a 401(k) plan, 8506.7075 shares in an ESOP, and 22009 shares in an IRA. Additionally, the filing lists Zanco's holdings of stock options, with varying vesting schedules and exercise prices. Footnotes provide further details on unvested shares and plan-specific information.