<SEC-DOCUMENT>0000950170-24-089279-index.html : 20240801
<SEC-HEADER>0000950170-24-089279.hdr.sgml : 20240801
<ACCEPTANCE-DATETIME>20240801161017
ACCESSION NUMBER:		0000950170-24-089279
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20240801
DATE AS OF CHANGE:		20240801

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ARCA biopharma, Inc.
		CENTRAL INDEX KEY:			0000907654
		STANDARD INDUSTRIAL CLASSIFICATION:	IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES [2835]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				363855489
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-279387
		FILM NUMBER:		241166717

	BUSINESS ADDRESS:	
		STREET 1:		10170 CHURCH RANCH WAY
		STREET 2:		SUITE 100
		CITY:			WESTMINSTER
		STATE:			CO
		ZIP:			80021
		BUSINESS PHONE:		7209402200

	MAIL ADDRESS:	
		STREET 1:		10170 CHURCH RANCH WAY
		STREET 2:		SUITE 100
		CITY:			WESTMINSTER
		STATE:			CO
		ZIP:			80021

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NUVELO INC
		DATE OF NAME CHANGE:	20030203

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	HYSEQ INC
		DATE OF NAME CHANGE:	19970610
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>abio_424b3_20240801.htm
<DESCRIPTION>424B3
<TEXT>
Document 1 - file: abio_424b3_20240801.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>img225960569_0.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: img225960569_0.jpg

</DOCUMENT>
</SEC-DOCUMENT>