<SEC-DOCUMENT>0001193125-25-073108-index.html : 20250404
<SEC-HEADER>0001193125-25-073108.hdr.sgml : 20250404
<ACCEPTANCE-DATETIME>20250404120711
ACCESSION NUMBER:		0001193125-25-073108
CONFORMED SUBMISSION TYPE:	POS EX
PUBLIC DOCUMENT COUNT:		8
FILED AS OF DATE:		20250404
DATE AS OF CHANGE:		20250404
EFFECTIVENESS DATE:		20250404

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:		25812629

	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>d906674dposex.htm
<DESCRIPTION>COLUMBIA ACORN TRUST
<TEXT>
Document 1 - file: d906674dposex.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(D)(1)(I)
<SEQUENCE>2
<FILENAME>d906674dex99d1i.htm
<DESCRIPTION>(D)(1)(I) AMENDMENT 1 (3-1-2025) TO IMS AGREE (CAT)
<TEXT>
Document 2 - file: d906674dex99d1i.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(D)(2)
<SEQUENCE>3
<FILENAME>d906674dex99d2.htm
<DESCRIPTION>(D)(2) MANAGEMENT AGREE (4-1-2025) - CAT
<TEXT>
Document 3 - file: d906674dex99d2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(D)(3)(II)
<SEQUENCE>4
<FILENAME>d906674dex99d3ii.htm
<DESCRIPTION>(D)(3)(II) AMENDMENT 2 (3-1-2025) TO ADMIN AGREE (CAT)
<TEXT>
Document 4 - file: d906674dex99d3ii.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(H)(1)
<SEQUENCE>5
<FILENAME>d906674dex99h1.htm
<DESCRIPTION>(H)(1) TA AGREE (4-1-2025)
<TEXT>
Document 5 - file: d906674dex99h1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(H)(1)(I)
<SEQUENCE>6
<FILENAME>d906674dex99h1i.htm
<DESCRIPTION>(H)(1)(I) SCHEDULE A (4-1-2025) TO TA AGREE
<TEXT>
Document 6 - file: d906674dex99h1i.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(H)(2)
<SEQUENCE>7
<FILENAME>d906674dex99h2.htm
<DESCRIPTION>(H)(2) FEE WAIVER AGREE (4-1-2025)
<TEXT>
Document 7 - file: d906674dex99h2.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.(H)(2)(I)
<SEQUENCE>8
<FILENAME>d906674dex99h2i.htm
<DESCRIPTION>(H)(2)(I) SCHEDULE A (4-1-2025) TO FEE WAIVER AGREE
<TEXT>
Document 8 - file: d906674dex99h2i.htm

</DOCUMENT>
</SEC-DOCUMENT>