<SEC-DOCUMENT>0001193125-25-160879-index.html : 20250718
<SEC-HEADER>0001193125-25-160879.hdr.sgml : 20250718
<ACCEPTANCE-DATETIME>20250718083757
ACCESSION NUMBER:		0001193125-25-160879
CONFORMED SUBMISSION TYPE:	POS EX
PUBLIC DOCUMENT COUNT:		8
FILED AS OF DATE:		20250718
DATE AS OF CHANGE:		20250718
EFFECTIVENESS DATE:		20250718

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COLUMBIA ACORN TRUST
		CENTRAL INDEX KEY:			0000002110
		ORGANIZATION NAME:           	
		EIN:				362692100
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		POS EX
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-34223
		FILM NUMBER:		251132670

	BUSINESS ADDRESS:	
		STREET 1:		71 S. WACKER DRIVE, SUITE 2500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		3126349200

	MAIL ADDRESS:	
		STREET 1:		71 S. WACKER DRIVE, SUITE 2500
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LIBERTY ACORN TRUST
		DATE OF NAME CHANGE:	20010424

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ACORN INVESTMENT TRUST
		DATE OF NAME CHANGE:	19940204

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ACORN FUND INC
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>POS EX
<SEQUENCE>1
<FILENAME>d88873dposex.htm
<DESCRIPTION>COLUMBIA ACORN TRUST
<TEXT>
Document 1 - file: d88873dposex.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(A)(4)
<SEQUENCE>2
<FILENAME>d88873dex99a4.htm
<DESCRIPTION>(A)(4) AMENDMENT NO. 3 TO DOT (7-7-2025)
<TEXT>
Document 2 - file: d88873dex99a4.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(B)
<SEQUENCE>3
<FILENAME>d88873dex99b.htm
<DESCRIPTION>(B) BY-LAWS (7-7-2025)
<TEXT>
Document 3 - file: d88873dex99b.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(D)(2)
<SEQUENCE>4
<FILENAME>d88873dex99d2.htm
<DESCRIPTION>(D)(2) NOVATION OF MANAGEMENT AGREE (7-7-2025)
<TEXT>
Document 4 - file: d88873dex99d2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(H)(1)(I)
<SEQUENCE>5
<FILENAME>d88873dex99h1i.htm
<DESCRIPTION>(H)(1)(I) SCHEDULES TO TA AGREE (7-1-2025)
<TEXT>
Document 5 - file: d88873dex99h1i.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(H)(2)
<SEQUENCE>6
<FILENAME>d88873dex99h2.htm
<DESCRIPTION>(H)(2) FEE WAIVER AGREE (7-1-2025)
<TEXT>
Document 6 - file: d88873dex99h2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(H)(2)(I)
<SEQUENCE>7
<FILENAME>d88873dex99h2i.htm
<DESCRIPTION>(H)(2)(I) SCHEDULE A TO FEE WAIVER AGREE (7-1-2025)
<TEXT>
Document 7 - file: d88873dex99h2i.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(H)(8)
<SEQUENCE>8
<FILENAME>d88873dex99h8.htm
<DESCRIPTION>(H)(8) FORM OF INDEMNIFICATION AGREE
<TEXT>
Document 8 - file: d88873dex99h8.htm

</DOCUMENT>
</SEC-DOCUMENT>