X0306 4 2021-10-12 0001849867 Catalyst Bancorp, Inc. CLST 0001885818 Kleiser Kirk E. C/O CATALYST BANCORP 235 N. COURT STREET OPELOUSAS LA 70570 1 Common Stock 2021-10-12 4 P 0 15000 10 A 15000 D Common Stock 2021-10-12 4 P 0 5000 10 A 5000 I By LLC Common Stock 2021-10-12 4 P 0 1000 10 A 1000 I By LLC Common Stock 2021-10-12 4 P 0 2500 10 A 2500 I By Corporation The 5,000 shares are held by the K Kleiser LLC of which the reporting person is the sole member. 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 90% owner. The 2,500 shares are held by Kleiser Enterprises, Inc. of which the reporting person is a senior managing member and 90% owner. /s/ Jutta Codori by P.O.A. for Kirk E. Kleiser 2021-10-12