    <SEC-DOCUMENT>0001849867-24-000012-index.html : 20240418
    <SEC-HEADER>0001849867-24-000012.hdr.sgml : 20240418
    <ACCEPTANCE-DATETIME>20240418091912
    ACCESSION NUMBER:		0001849867-24-000012
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20231231
    FILED AS OF DATE:		20240418
    DATE AS OF CHANGE:		20240418
    EFFECTIVENESS DATE:		20240418

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Catalyst Bancorp, Inc.
    		CENTRAL INDEX KEY:			0001849867
    		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTION, FEDERALLY CHARTERED [6035]
    		ORGANIZATION NAME:           	02 Finance
    		IRS NUMBER:				862411762

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-40893
    		FILM NUMBER:		24853045

    	BUSINESS ADDRESS:
    		STREET 1:		235 N. COURT STREET
    		CITY:			OPELOUSAS
    		STATE:			LA
    		ZIP:			70570
    		BUSINESS PHONE:		337-948-3033

    	MAIL ADDRESS:
    		STREET 1:		235 N. COURT STREET
    		CITY:			OPELOUSAS
    		STATE:			LA
    		ZIP:			70570
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>ARS
    <SEQUENCE>1
    <FILENAME>clst-20231231xars.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: clst-20231231xars.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>