<SEC-DOCUMENT>0001964306-26-000033.txt : 20260112
<SEC-HEADER>0001964306-26-000033.hdr.sgml : 20260112
<ACCEPTANCE-DATETIME>20260112160244
ACCESSION NUMBER:		0001964306-26-000033
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20260112
DATE AS OF CHANGE:		20260112

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Acumen Pharmaceuticals, Inc.
		CENTRAL INDEX KEY:			0001576885
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		ORGANIZATION NAME:           	03 Life Sciences
		EIN:				364108129
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	001-40551
		FILM NUMBER:		26526695

	BUSINESS ADDRESS:	
		STREET 1:		1210-1220 WASHINGTON STREET
		STREET 2:		SUITE 210
		CITY:			NEWTON
		STATE:			MA
		ZIP:			02465
		BUSINESS PHONE:		617-344-4190

	MAIL ADDRESS:	
		STREET 1:		1210-1220 WASHINGTON STREET
		STREET 2:		SUITE 210
		CITY:			NEWTON
		STATE:			MA
		ZIP:			02465

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OConnell Daniel Joseph
		CENTRAL INDEX KEY:			0001865136
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		C/O ACUMEN PHARMACEUTICALS, INC.
		STREET 2:		427 PARK STREET
		CITY:			CHARLOTTESVILLE
		STATE:			VA
		ZIP:			22902
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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      <issuerCik>0001576885</issuerCik>
      <issuerName>Acumen Pharmaceuticals, Inc.</issuerName>
      <secFileNumber>001-40551</secFileNumber>
      <issuerAddress>
        <com:street1>1210-1220 WASHINGTON STREET</com:street1>
        <com:street2>SUITE 210</com:street2>
        <com:city>NEWTON</com:city>
        <com:stateOrCountry>MA</com:stateOrCountry>
        <com:zipCode>02465</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>617-344-4190</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>OConnell Daniel Joseph</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common stock</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Merrill Lynch</name>
        <address>
          <com:street1>225 Liberty St</com:street1>
          <com:street2>Floor 37</com:street2>
          <com:city>New York</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10281</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>5388</noOfUnitsSold>
      <aggregateMarketValue>9306.56</aggregateMarketValue>
      <noOfUnitsOutstanding>60573425</noOfUnitsOutstanding>
      <approxSaleDate>01/12/2026</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common stock</securitiesClassTitle>
      <acquiredDate>01/07/2026</acquiredDate>
      <natureOfAcquisitionTransaction>Vesting of restricted stock unit award</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Acumen Pharmaceuticals, Inc.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>5388</amountOfSecuritiesAcquired>
      <paymentDate>01/07/2026</paymentDate>
      <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
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        <name>Daniel OConnell</name>
        <address>
          <com:street1>1210-1220 WASHINGTON STREET</com:street1>
          <com:street2>SUITE 210</com:street2>
          <com:city>NEWTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02465</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common stock</securitiesClassTitle>
      <saleDate>01/05/2026</saleDate>
      <amountOfSecuritiesSold>4649</amountOfSecuritiesSold>
      <grossProceeds>9163.33</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Daniel OConnell</name>
        <address>
          <com:street1>1210-1220 WASHINGTON STREET</com:street1>
          <com:street2>SUITE 210</com:street2>
          <com:city>NEWTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02465</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common stock</securitiesClassTitle>
      <saleDate>01/06/2026</saleDate>
      <amountOfSecuritiesSold>5102</amountOfSecuritiesSold>
      <grossProceeds>10031.44</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Daniel OConnell</name>
        <address>
          <com:street1>1210-1220 WASHINGTON STREET</com:street1>
          <com:street2>SUITE 210</com:street2>
          <com:city>NEWTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02465</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common stock</securitiesClassTitle>
      <saleDate>01/07/2026</saleDate>
      <amountOfSecuritiesSold>37755</amountOfSecuritiesSold>
      <grossProceeds>74980.95</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Daniel OConnell</name>
        <address>
          <com:street1>1210-1220 WASHINGTON STREET</com:street1>
          <com:street2>SUITE 210</com:street2>
          <com:city>NEWTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02465</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common stock</securitiesClassTitle>
      <saleDate>01/08/2026</saleDate>
      <amountOfSecuritiesSold>8143</amountOfSecuritiesSold>
      <grossProceeds>14815.32</grossProceeds>
    </securitiesSoldInPast3Months>
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      <sellerDetails>
        <name>Daniel OConnell</name>
        <address>
          <com:street1>1210-1220 WASHINGTON STREET</com:street1>
          <com:street2>SUITE 210</com:street2>
          <com:city>NEWTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02465</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Common stock</securitiesClassTitle>
      <saleDate>01/09/2026</saleDate>
      <amountOfSecuritiesSold>12941</amountOfSecuritiesSold>
      <grossProceeds>22832.18</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>01/12/2026</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>06/27/2025</planAdoptionDate>
      </planAdoptionDates>
      <signature>Daniel OConnell</signature>
    </noticeSignature>
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</DOCUMENT>
</SEC-DOCUMENT>
