<SEC-DOCUMENT>0001209191-13-038396.txt : 20130730
<SEC-HEADER>0001209191-13-038396.hdr.sgml : 20130730
<ACCEPTANCE-DATETIME>20130730183121
ACCESSION NUMBER:		0001209191-13-038396
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20130726
FILED AS OF DATE:		20130730
DATE AS OF CHANGE:		20130730

ISSUER:		

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

	BUSINESS ADDRESS:	
		STREET 1:		8001 ARISTA PLACE
		STREET 2:		SUITE 430
		CITY:			BROOMFIELD
		STATE:			CO
		ZIP:			80021
		BUSINESS PHONE:		720-940-2200

	MAIL ADDRESS:	
		STREET 1:		8001 ARISTA PLACE
		STREET 2:		SUITE 430
		CITY:			BROOMFIELD
		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

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Woosley Raymond L.
		CENTRAL INDEX KEY:			0001582095

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-22873
		FILM NUMBER:		13997069

	MAIL ADDRESS:	
		STREET 1:		C/O ARCA BIOPHARMA, INC.
		STREET 2:		8001 ARISTA PLACE, STE 430
		CITY:			BROOMFIELD
		STATE:			CO
		ZIP:			80021
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>c575332_3x1.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2013-07-26</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000907654</issuerCik>
        <issuerName>ARCA biopharma, Inc.</issuerName>
        <issuerTradingSymbol>ABIO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001582095</rptOwnerCik>
            <rptOwnerName>Woosley Raymond L.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O 1822 E. INNOVATION PARK DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TUCSON</rptOwnerCity>
            <rptOwnerState>AZ</rptOwnerState>
            <rptOwnerZipCode>85755</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Options to Purchase Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.40</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2023-07-26</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1250</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The options vest in equal monthly installments over a three (3) year period, beginning on the grant date of July 26, 2013.  If the Reporting Person's service as a director of the Issuer terminates in connection with or at any time following a change in control (for whatever reason), then any unexpired options that remain unvested shall become fully vested.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Patrick M. Wheeler, attorney in fact</signatureName>
        <signatureDate>2013-07-30</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>c575332_24.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>

<html>
<head>
     <title>Exhibit 24</title>
</head>
<body>
<PRE>



                                                                      Exhibit 24


                                   POWER OF ATTORNEY


     Know all by these presents, that the undersigned hereby constitutes and appoints
each of Christopher D. Ozeroff, Patrick M. Wheeler, Brian Selby and Brent D. Fassett,
signing individually, the undersigned's true and lawful attorneys-in fact and agents to:

          (1)  execute for and on behalf of the undersigned, an officer, director
     or holder of 10% of more of a registered class of securities of ARCA biopharma, Inc.
     (the "Company"), Forms 3, 4 and 5 in accordance with Section 16(a) of the
      Securities Exchange Act of 1934, as amended (the "Exchange Act") and the rules
      thereunder;

         (2)  do and perform any and all acts for and on behalf of the undersigned
     that may be necessary or desirable to complete and execute such Form 3, 4 or
     5, complete and execute any amendment or amendments thereto, and timely file
     such forms or amendments with the United States Securities and Exchange
     Commission and any stock exchange or similar authority; and

          (3)  take any other action of any nature whatsoever in connection with
     the foregoing which, in the opinion of such attorney-in-fact, may be of benefit,
     in the best interest of, or legally required by, the undersigned, it being
     understood that the documents executed by such attorney-in-fact on behalf
     of the undersigned pursuant to this Power of Attorney shall be in such form
     and shall contain such terms and conditions as such attorney-in-fact may
     approve in such attorney-in-fact's discretion.

     The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the rights and powers herein granted.
The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in
such capacity at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Exchange Act.

      This Power of Attorney shall remain in full force and effect until the earliest
to occur of (a) the undersigned is no longer required to file Forms 3, 4 and 5
with respect to the undersigned's holdings of and transactions in securities issued
by the Company, (b) revocation by the undersigned in a signed writing delivered
to the foregoing attorneys-in-fact or (c) as to any attorney-in-fact individually,
until such attorney-in-fact shall no longer be employed by the Company or Cooley
Godward Kronish LLP, as applicable.

      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 19th day of July, 2013.


                         /s/ Raymond L. Woosley
                         ----------------------------------------
                         Raymond L. Woosley, M.D., Ph.D.



</PRE>
</body>
</html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
