<SEC-DOCUMENT>0001104659-21-090244.txt : 20210708
<SEC-HEADER>0001104659-21-090244.hdr.sgml : 20210708
<ACCEPTANCE-DATETIME>20210708163255
ACCESSION NUMBER:		0001104659-21-090244
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210706
FILED AS OF DATE:		20210708
DATE AS OF CHANGE:		20210708

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RA Capital Healthcare Fund LP
		CENTRAL INDEX KEY:			0001315082
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40551
		FILM NUMBER:		211080528

	BUSINESS ADDRESS:	
		STREET 1:		200 BERKELEY STREET
		STREET 2:		18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		6177782500

	MAIL ADDRESS:	
		STREET 1:		200 BERKELEY STREET
		STREET 2:		18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER NAME:	
		FORMER CONFORMED NAME:	RA Capital Biotech Fund LP
		DATE OF NAME CHANGE:	20050121

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RA CAPITAL MANAGEMENT, L.P.
		CENTRAL INDEX KEY:			0001346824
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40551
		FILM NUMBER:		211080529

	BUSINESS ADDRESS:	
		STREET 1:		200 BERKELEY STREET, 18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617-778-2500

	MAIL ADDRESS:	
		STREET 1:		200 BERKELEY STREET, 18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER NAME:	
		FORMER CONFORMED NAME:	RA CAPITAL MANAGEMENT, LLC
		DATE OF NAME CHANGE:	20051213

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			RA Capital Nexus Fund II, L.P.
		CENTRAL INDEX KEY:			0001825376
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40551
		FILM NUMBER:		211080527

	BUSINESS ADDRESS:	
		STREET 1:		200 BERKELEY STREET, 18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		617-778-2500

	MAIL ADDRESS:	
		STREET 1:		200 BERKELEY STREET, 18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Kolchinsky Peter
		CENTRAL INDEX KEY:			0001384859

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40551
		FILM NUMBER:		211080526

	MAIL ADDRESS:	
		STREET 1:		200 BERKELEY STREET
		STREET 2:		18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Shah Rajeev M.
		CENTRAL INDEX KEY:			0001619841

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-40551
		FILM NUMBER:		211080525

	MAIL ADDRESS:	
		STREET 1:		200 BERKELEY STREET
		STREET 2:		18TH FLOOR
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Acumen Pharmaceuticals, Inc.
		CENTRAL INDEX KEY:			0001576885
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				364108129
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4435 NORTH FIRST STREET, SUITE 360
		CITY:			LIVERMORE
		STATE:			CA
		ZIP:			94551
		BUSINESS PHONE:		925-368-8508

	MAIL ADDRESS:	
		STREET 1:		4435 NORTH FIRST STREET, SUITE 360
		CITY:			LIVERMORE
		STATE:			CA
		ZIP:			94551
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            <rptOwnerStreet2>200 BERKELEY STREET, 18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
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                <natureOfOwnership>
                    <value>See footnotes</value>
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                    <footnoteId id="F5"/>
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        </nonDerivativeTransaction>
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                <natureOfOwnership>
                    <value>See footnotes</value>
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        </nonDerivativeTransaction>
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                    <value>1184366</value>
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                    <value>See footnotes</value>
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                    <footnoteId id="F5"/>
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        </nonDerivativeTransaction>
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                <equitySwapInvolved>0</equitySwapInvolved>
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                    <value>115668</value>
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                <transactionPricePerShare>
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                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>See footnotes</value>
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            <transactionAmounts>
                <transactionShares>
                    <value>588850</value>
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                <transactionPricePerShare>
                    <footnoteId id="F1"/>
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                    <value>See footnotes</value>
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                    <footnoteId id="F5"/>
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    <derivativeTable>
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                <footnoteId id="F1"/>
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            <transactionDate>
                <value>2021-07-06</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionAmounts>
                <transactionShares>
                    <value>6122557</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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                    <value>6122557</value>
                    <footnoteId id="F2"/>
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                    <value>0</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F5"/>
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        <derivativeTransaction>
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                    <value>1184366</value>
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                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F1"/>
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            <expirationDate>
                <footnoteId id="F1"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>1184366</value>
                    <footnoteId id="F3"/>
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                    <value>0</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F5"/>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Series B Preferred Stock</value>
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                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>588850</value>
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                <transactionPricePerShare>
                    <value>0</value>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            <exerciseDate>
                <footnoteId id="F1"/>
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                <footnoteId id="F1"/>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
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                <underlyingSecurityShares>
                    <value>588850</value>
                    <footnoteId id="F4"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                <sharesOwnedFollowingTransaction>
                    <value>0</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See footnotes</value>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
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    <footnotes>
        <footnote id="F1">On July 6, 2021, each share of Series B Preferred Stock (the &quot;Preferred Stock&quot;) converted into one share of Common Stock of the Issuer without payment of further consideration upon closing of the initial public offering of the Issuer's common stock. The shares had no expiration date.</footnote>
        <footnote id="F2">These securities are held directly by RA Capital Healthcare Fund, L.P. (the &quot;Fund&quot;).</footnote>
        <footnote id="F3">These securities are held directly by RA Capital Nexus Fund II, L.P. (the &quot;Nexus Fund II&quot;).</footnote>
        <footnote id="F4">These securities are held directly by a separately managed account (the &quot;Account&quot;).</footnote>
        <footnote id="F5">RA Capital Management, L.P. (the &quot;Adviser&quot;) is the investment manager for the Fund and the Nexus Fund II and the Account. The general partner of the Adviser is RA Capital Management GP, LLC (the &quot;Adviser GP&quot;), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. The Adviser, the Adviser GP, Dr. Kolchinsky and Mr. Shah disclaim beneficial ownership of any of the reported securities, except to the extent of their pecuniary interest therein.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Peter Kolchinsky, Manager of RA Capital Management, L.P.</signatureName>
        <signatureDate>2021-07-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Peter Kolchinsky, Manager of RA Capital Healthcare GP, LLC the General Partner of RA Capital Healthcare Fund, L.P.</signatureName>
        <signatureDate>2021-07-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Peter Kolchinsky, Manager of RA Capital Nexus Fund II GP, LLC the General Partner of RA Capital Nexus Fund II, L.P.</signatureName>
        <signatureDate>2021-07-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Peter Kolchinsky, individually</signatureName>
        <signatureDate>2021-07-08</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Rajeev Shah, individually</signatureName>
        <signatureDate>2021-07-08</signatureDate>
    </ownerSignature>
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