<SEC-DOCUMENT>0000796370-25-000012.txt : 20251002
<SEC-HEADER>0000796370-25-000012.hdr.sgml : 20251002
<ACCEPTANCE-DATETIME>20251002112401
ACCESSION NUMBER:		0000796370-25-000012
CONFORMED SUBMISSION TYPE:	13F-NT
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250930
FILED AS OF DATE:		20251002
DATE AS OF CHANGE:		20251002
EFFECTIVENESS DATE:		20251002

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Acadian Inc
		CENTRAL INDEX KEY:			0000796370
		STANDARD INDUSTRIAL CLASSIFICATION:	INVESTMENT ADVICE [6282]
		ORGANIZATION NAME:           	02 Finance
		EIN:				042714625
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		13F-NT
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-11931
		FILM NUMBER:		251367446

	BUSINESS ADDRESS:	
		STREET 1:		200 STATE ST., SUITE 601A
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02109
		BUSINESS PHONE:		(617) 369-7300

	MAIL ADDRESS:	
		STREET 1:		200 STATE ST., SUITE 601A
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02109

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BrightSphere Inc.
		DATE OF NAME CHANGE:	20180329

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	OMAM INC.
		DATE OF NAME CHANGE:	20150106

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	OLD MUTUAL (US) HOLDINGS INC.
		DATE OF NAME CHANGE:	20060419
</SEC-HEADER>
<DOCUMENT>
<TYPE>13F-NT
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
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<edgarSubmission xmlns="http://www.sec.gov/edgar/thirteenffiler" xmlns:com="http://www.sec.gov/edgar/common">
  <schemaVersion>X0202</schemaVersion>
  <headerData>
    <submissionType>13F-NT</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <flags>
        <confirmingCopyFlag>false</confirmingCopyFlag>
        <returnCopyFlag>false</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
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      <filer>
        <credentials>
          <cik>0000796370</cik>
          <ccc>XXXXXXXX</ccc>
        </credentials>
      </filer>
      <periodOfReport>09-30-2025</periodOfReport>
    </filerInfo>
  </headerData>
  <formData>
    <coverPage>
      <reportCalendarOrQuarter>09-30-2025</reportCalendarOrQuarter>
      <filingManager>
        <name>Acadian Inc</name>
        <address>
          <com:street1>200 STATE ST., SUITE 601A</com:street1>
          <com:city>BOSTON</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02109</com:zipCode>
        </address>
      </filingManager>
      <reportType>13F NOTICE</reportType>
      <form13FFileNumber>028-11931</form13FFileNumber>
      <otherManagersInfo>
        <otherManager>
          <cik>0000916542</cik>
          <form13FFileNumber>028-05990</form13FFileNumber>
          <name>ACADIAN ASSET MANAGEMENT LLC</name>
        </otherManager>
      </otherManagersInfo>
      <provideInfoForInstruction5>Y</provideInfoForInstruction5>
      <additionalInformation>Acadian Inc. ("Acadian") is the operating U.S. holding company of certain asset management subsidiaries of Acadian Asset Managment Inc that are subject to applicable 13F filing requirements. Acadian expressly disclaims beneficial ownership of all reported securities. Acadian does not exercise voting or investment power over any reported security. Each Acadian asset management firm exercises such power independently of Acadian and one another.</additionalInformation>
    </coverPage>
    <signatureBlock>
      <name>Patrick Golden</name>
      <title>Investment Operations and Compliance Manager</title>
      <phone>6172590015</phone>
      <signature>Patrick Golden</signature>
      <city>Holbrook</city>
      <stateOrCountry>MA</stateOrCountry>
      <signatureDate>10-02-2025</signatureDate>
    </signatureBlock>
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