<SEC-DOCUMENT>0001171843-25-006324.txt : 20251007
<SEC-HEADER>0001171843-25-006324.hdr.sgml : 20251007
<ACCEPTANCE-DATETIME>20251007132651
ACCESSION NUMBER:		0001171843-25-006324
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20250905
FILED AS OF DATE:		20251007
DATE AS OF CHANGE:		20251007

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DENELSKY STEPHEN J
		CENTRAL INDEX KEY:			0001204320
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-33957
		FILM NUMBER:		251379122

	MAIL ADDRESS:	
		STREET 1:		84 OCTOBER HILL ROAD
		CITY:			HOLLISTON
		STATE:			MA
		ZIP:			01746

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HARVARD BIOSCIENCE INC
		CENTRAL INDEX KEY:			0001123494
		STANDARD INDUSTRIAL CLASSIFICATION:	LABORATORY ANALYTICAL INSTRUMENTS [3826]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		EIN:				043306140
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		84 OCTOBER HILL RD
		CITY:			HOLLISTON
		STATE:			MA
		ZIP:			01746
		BUSINESS PHONE:		5088938999

	MAIL ADDRESS:	
		STREET 1:		84 OCTOBER HILL ROAD
		CITY:			HOLLISTON
		STATE:			MA
		ZIP:			01746
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>ownership.xml
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<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-09-05</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001123494</issuerCik>
        <issuerName>HARVARD BIOSCIENCE INC</issuerName>
        <issuerTradingSymbol>HBIO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001204320</rptOwnerCik>
            <rptOwnerName>DENELSKY STEPHEN J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O HARVARD BIOSCIENCE, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>84 OCTOBER HILL ROAD</rptOwnerStreet2>
            <rptOwnerCity>HOLLISTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01746</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Stephen DeNelsky</signatureName>
        <signatureDate>2025-10-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
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<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>exh_24.htm
<DESCRIPTION>EXHIBIT 24
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0"></P>

<P STYLE="text-align: right; font-size: 10pt; margin: 0pt 0"><B>Exhibit 24</B></P>

<P STYLE="margin: 0pt 0; font-size: 10pt">&nbsp;</P>

<P STYLE="text-align: right; font-size: 10pt; margin: 0pt 0 0pt 4in">October 6, 2025</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">Harvard Bioscience, Inc.</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">84 October Hill Road</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">Holliston, MA 01746</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">Attention: Board of Directors of Harvard Bioscience, Inc.</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font-size: 10pt; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.5in"><B>Re:</B></TD><TD STYLE="padding-right: 1in"><B>Electronic Signature Attestation</B></TD></TR></TABLE>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">Dear Board of Directors of Harvard Bioscience, Inc.:</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; text-indent: 0.5in; margin: 0pt 0">Pursuant to 17 C.F.R. &sect; 232.302, I hereby confirm that my electronic
signature may be used to authenticate, acknowledge or otherwise adopt my signature that appears in typed form within any document that
is electronically filed with, or furnished to, the United States Securities and Exchange Commission (the &ldquo;SEC&rdquo;) by me or on
my behalf, or by Harvard Bioscience, Inc. The provision of my electronic signature for this purpose will be the legal equivalent to the
provision of my manual signature. I hereby acknowledge and agree that a copy of this document will be provided to the SEC or its staff
upon request.</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 4in"></P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 4in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD COLSPAN="2">Respectfully,</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD COLSPAN="2">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD STYLE="width: 50%">&nbsp;</TD>
  <TD STYLE="border-bottom: Black 1pt solid; width: 25%">/s/ Stephen DeNelsky</TD>
  <TD STYLE="width: 25%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD COLSPAN="2">Name: Stephen DeNelsky</TD></TR>
<TR STYLE="vertical-align: top; text-align: left">
  <TD>&nbsp;</TD>
  <TD COLSPAN="2">Title:&#8239;&#8239;&#8239;Director</TD></TR>
</TABLE>

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt"></P>

<P STYLE="font-size: 10pt; text-indent: -0.5in; margin: 0pt 0 0pt 4in">&nbsp;</P>

<P STYLE="font-size: 10pt; margin: 0pt 0 0pt 4in">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt">&nbsp;</P>

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt"></P>

<!-- Field: Rule-Page --><DIV STYLE="margin: 3pt auto; width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 3pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<P STYLE="margin: 0pt 0 0pt 4in; font-size: 10pt"></P>

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