    <SEC-DOCUMENT>0000950170-25-065795-index.html : 20250507
    <SEC-HEADER>0000950170-25-065795.hdr.sgml : 20250507
    <ACCEPTANCE-DATETIME>20250507163759
    ACCESSION NUMBER:		0000950170-25-065795
    CONFORMED SUBMISSION TYPE:	DEFR14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20250507
    DATE AS OF CHANGE:		20250507

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Fulcrum Therapeutics, Inc.
    		CENTRAL INDEX KEY:			0001680581
    		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
    		ORGANIZATION NAME:           	03 Life Sciences
    		EIN:				474839948
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFR14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-38978
    		FILM NUMBER:		25922079

    	BUSINESS ADDRESS:
    		STREET 1:		26 LANDSDOWNE STREET
    		CITY:			CAMBRIDGE
    		STATE:			MA
    		ZIP:			02139
    		BUSINESS PHONE:		617-651-8851

    	MAIL ADDRESS:
    		STREET 1:		26 LANDSDOWNE STREET
    		CITY:			CAMBRIDGE
    		STATE:			MA
    		ZIP:			02139
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFR14A
    <SEQUENCE>1
    <FILENAME>fulc_defr14a_2025.htm
    <DESCRIPTION>DEFR14A
    <TEXT>
    Document 1 - file: fulc_defr14a_2025.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>img106926888_0.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: img106926888_0.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>img106926888_1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: img106926888_1.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>