<SEC-DOCUMENT>0000053417-25-000064.txt : 20250509
<SEC-HEADER>0000053417-25-000064.hdr.sgml : 20250509
<ACCEPTANCE-DATETIME>20250509121427
ACCESSION NUMBER:		0000053417-25-000064
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250509
DATE AS OF CHANGE:		20250509

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Great Lakes Dredge & Dock CORP
		CENTRAL INDEX KEY:			0001372020
		STANDARD INDUSTRIAL CLASSIFICATION:	HEAVY CONSTRUCTION OTHER THAN BUILDING CONST - CONTRACTORS [1600]
		ORGANIZATION NAME:           	05 Real Estate & Construction
		EIN:				205336063
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-82317
		FILM NUMBER:		25929167

	BUSINESS ADDRESS:	
		STREET 1:		9811 KATY FREEWAY
		STREET 2:		SUITE 1200
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77024
		BUSINESS PHONE:		(346) 359-1010

	MAIL ADDRESS:	
		STREET 1:		9811 KATY FREEWAY
		STREET 2:		SUITE 1200
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77024

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Great Lakes Dredge & Dock Holdings Corp.
		DATE OF NAME CHANGE:	20060808

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			JENNISON ASSOCIATES LLC
		CENTRAL INDEX KEY:			0000053417
		ORGANIZATION NAME:           	
		EIN:				132631108
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		55 EAST 52ND STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10055
		BUSINESS PHONE:		2124211000

	MAIL ADDRESS:	
		STREET 1:		55 EAST 52ND STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10055

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	JENNISON ASSOCIATES CAPITAL CORP
		DATE OF NAME CHANGE:	19940511
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
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    <submissionType>SCHEDULE 13G/A</submissionType>
    <previousAccessionNumber>0000053417-10-000052</previousAccessionNumber>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0000053417</cik>
          <ccc>XXXXXXXX</ccc>
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      <liveTestFlag>LIVE</liveTestFlag>


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  <formData>
    <coverPageHeader>
      <amendmentNo>1</amendmentNo>
      <securitiesClassTitle>Common Stock</securitiesClassTitle>
      <eventDateRequiresFilingThisStatement>03/31/2025</eventDateRequiresFilingThisStatement>
      <issuerInfo>
        <issuerCik>0001372020</issuerCik>
        <issuerName>GREAT LAKES DREDGE &amp;amp; DOCK CO</issuerName>
        <issuerCusip>390607109</issuerCusip>
        <issuerPrincipalExecutiveOfficeAddress>
          <com:street1>9811 Katy Freeway, Suite 1200</com:street1>
          <com:city>Houston</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>77024</com:zipCode>
        </issuerPrincipalExecutiveOfficeAddress>
      </issuerInfo>
      <designateRulesPursuantThisScheduleFiled>
        <designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
      </designateRulesPursuantThisScheduleFiled>
    </coverPageHeader>
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      <reportingPersonName>Jennison Associates LLC</reportingPersonName>
      <citizenshipOrOrganization>DE</citizenshipOrOrganization>
      <reportingPersonBeneficiallyOwnedNumberOfShares>
        <soleVotingPower>5310894</soleVotingPower>
        <sharedVotingPower>0</sharedVotingPower>
        <soleDispositivePower>0</soleDispositivePower>
        <sharedDispositivePower>5310894</sharedDispositivePower>
      </reportingPersonBeneficiallyOwnedNumberOfShares>
      <reportingPersonBeneficiallyOwnedAggregateNumberOfShares>5310894</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
      <classPercent>7.9</classPercent>
      <typeOfReportingPerson>IA</typeOfReportingPerson>
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      <item1>
        <issuerName>GREAT LAKES DREDGE &amp;amp; DOCK CO</issuerName>
        <issuerPrincipalExecutiveOfficeAddress>9811 Katy Freeway, Suite 1200, Houston, TX 77024</issuerPrincipalExecutiveOfficeAddress>
      </item1>
      <item2>
        <filingPersonName>Jennison Associates LLC</filingPersonName>
        <principalBusinessOfficeOrResidenceAddress>55 East 52nd Street, New York, NY 10055</principalBusinessOfficeOrResidenceAddress>
        <citizenship>USA</citizenship>
      </item2>
      <item3>
        <typeOfPersonFiling>IA</typeOfPersonFiling>
      </item3>
      <item4>
        <amountBeneficiallyOwned>46204778</amountBeneficiallyOwned>
        <classPercent>7.9</classPercent>
        <numberOfSharesPersonHas>
          <solePowerOrDirectToVote>5310894</solePowerOrDirectToVote>
          <sharedPowerOrDirectToVote>0</sharedPowerOrDirectToVote>
          <solePowerOrDirectToDispose>0</solePowerOrDirectToDispose>
          <sharedPowerOrDirectToDispose>5310894</sharedPowerOrDirectToDispose>
        </numberOfSharesPersonHas>
      </item4>
      <item5>
        <notApplicableFlag>Y</notApplicableFlag>
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      <item9>
        <notApplicableFlag>Y</notApplicableFlag>
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      <item10>
        <notApplicableFlag>N</notApplicableFlag>
        <certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under &amp;#167; 240.14a-11.</certifications>
      </item10>
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    <signatureInformation>
      <reportingPersonName>Jennison Associates LLC</reportingPersonName>
      <signatureDetails>
        <signature>Beata Markowicz</signature>
        <title>Senior Vice President, Compliance</title>
        <date>05/09/2025</date>
      </signatureDetails>
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</SEC-DOCUMENT>
