<SEC-DOCUMENT>0001683863-25-002046-index.html : 20250314
<SEC-HEADER>0001683863-25-002046.hdr.sgml : 20250314
<ACCEPTANCE-DATETIME>20250314085620
ACCESSION NUMBER:		0001683863-25-002046
CONFORMED SUBMISSION TYPE:	24F-2NT
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20241231
FILED AS OF DATE:		20250314
DATE AS OF CHANGE:		20250314
EFFECTIVENESS DATE:		20250314

FILER:

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

	FILING VALUES:
		FORM TYPE:		24F-2NT
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-34223
		FILM NUMBER:		25737795

	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
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000002110
<SERIES-ID>S000009184
<SERIES-NAME>Columbia Acorn Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024954
<CLASS-CONTRACT-NAME>Columbia Acorn Fund Class A
<CLASS-CONTRACT-TICKER-SYMBOL>LACAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024956
<CLASS-CONTRACT-NAME>Columbia Acorn Fund Class C
<CLASS-CONTRACT-TICKER-SYMBOL>LIACX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024957
<CLASS-CONTRACT-NAME>Columbia Acorn Fund Institutional Class
<CLASS-CONTRACT-TICKER-SYMBOL>ACRNX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122736
<CLASS-CONTRACT-NAME>Columbia Acorn Fund Institutional 2 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CRBRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122737
<CLASS-CONTRACT-NAME>Columbia Acorn Fund Institutional 3 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CRBYX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000251059
<CLASS-CONTRACT-NAME>Columbia Acorn Fund Class S
<CLASS-CONTRACT-TICKER-SYMBOL>ACRSX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000002110
<SERIES-ID>S000009185
<SERIES-NAME>Columbia Acorn International
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024958
<CLASS-CONTRACT-NAME>Columbia Acorn International Class A
<CLASS-CONTRACT-TICKER-SYMBOL>LAIAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024961
<CLASS-CONTRACT-NAME>Columbia Acorn International Institutional Class
<CLASS-CONTRACT-TICKER-SYMBOL>ACINX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000097733
<CLASS-CONTRACT-NAME>Columbia Acorn International Institutional 2 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CAIRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122739
<CLASS-CONTRACT-NAME>Columbia Acorn International Institutional 3 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CCYIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000251060
<CLASS-CONTRACT-NAME>Columbia Acorn International Class S
<CLASS-CONTRACT-TICKER-SYMBOL>CCIDX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000002110
<SERIES-ID>S000009188
<SERIES-NAME>Columbia Acorn International Select
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024970
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Class A
<CLASS-CONTRACT-TICKER-SYMBOL>LAFAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024973
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Institutional Class
<CLASS-CONTRACT-TICKER-SYMBOL>ACFFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122746
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Institutional 2 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CRIRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122747
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Institutional 3 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CSIRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000251061
<CLASS-CONTRACT-NAME>Columbia Acorn International Select Class S
<CLASS-CONTRACT-TICKER-SYMBOL>ACFEX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000002110
<SERIES-ID>S000009189
<SERIES-NAME>Columbia Thermostat Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024974
<CLASS-CONTRACT-NAME>Columbia Thermostat Fund Class A
<CLASS-CONTRACT-TICKER-SYMBOL>CTFAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024976
<CLASS-CONTRACT-NAME>Columbia Thermostat Fund Class C
<CLASS-CONTRACT-TICKER-SYMBOL>CTFDX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024977
<CLASS-CONTRACT-NAME>Columbia Thermostat Fund Institutional Class
<CLASS-CONTRACT-TICKER-SYMBOL>COTZX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122750
<CLASS-CONTRACT-NAME>Columbia Thermostat Fund Institutional 2 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CQTRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122751
<CLASS-CONTRACT-NAME>Columbia Thermostat Fund Institutional 3 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CYYYX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000251062
<CLASS-CONTRACT-NAME>Columbia Thermostat Class S
<CLASS-CONTRACT-TICKER-SYMBOL>COTDX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000002110
<SERIES-ID>S000033621
<SERIES-NAME>Columbia Acorn European Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000103324
<CLASS-CONTRACT-NAME>Columbia Acorn European Fund Class A
<CLASS-CONTRACT-TICKER-SYMBOL>CAEAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000103327
<CLASS-CONTRACT-NAME>Columbia Acorn European Fund Institutional Class
<CLASS-CONTRACT-TICKER-SYMBOL>CAEZX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>24F-2NT
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

</DOCUMENT>
</SEC-DOCUMENT>