<SEC-DOCUMENT>0001193125-17-340617-index.html : 20171113
<SEC-HEADER>0001193125-17-340617.hdr.sgml : 20171113
<ACCEPTANCE-DATETIME>20171113135355
ACCESSION NUMBER:		0001193125-17-340617
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20171113
DATE AS OF CHANGE:		20171113
EFFECTIVENESS DATE:		20171113

FILER:

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

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-34223
		FILM NUMBER:		171195086

	BUSINESS ADDRESS:	
		STREET 1:		227 W MONROE STE 3000
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		3126349200

	MAIL ADDRESS:	
		STREET 1:		227 W MONROE STE 3000
		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>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>C000024960
<CLASS-CONTRACT-NAME>Columbia Acorn International Class C
<CLASS-CONTRACT-TICKER-SYMBOL>LAICX
</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>C000097732
<CLASS-CONTRACT-NAME>Columbia Acorn International Class R
<CLASS-CONTRACT-TICKER-SYMBOL>CACRX
</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>C000122738
<CLASS-CONTRACT-NAME>Columbia Acorn International Advisor Class
<CLASS-CONTRACT-TICKER-SYMBOL>CCIRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122739
<CLASS-CONTRACT-NAME>Columbia Acorn International Institutional 3 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CCYIX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000002110
<SERIES-ID>S000009186
<SERIES-NAME>Columbia Acorn USA
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024962
<CLASS-CONTRACT-NAME>Columbia Acorn USA Class A
<CLASS-CONTRACT-TICKER-SYMBOL>LAUAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024964
<CLASS-CONTRACT-NAME>Columbia Acorn USA Class C
<CLASS-CONTRACT-TICKER-SYMBOL>LAUCX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000024965
<CLASS-CONTRACT-NAME>Columbia Acorn USA Institutional Class
<CLASS-CONTRACT-TICKER-SYMBOL>AUSAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122740
<CLASS-CONTRACT-NAME>Columbia Acorn USA Advisor Class
<CLASS-CONTRACT-TICKER-SYMBOL>CUSAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122741
<CLASS-CONTRACT-NAME>Columbia Acorn USA Institutional 2 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CYSRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122742
<CLASS-CONTRACT-NAME>Columbia Acorn USA Institutional 3 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CUSYX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000002110
<SERIES-ID>S000033622
<SERIES-NAME>Columbia Acorn Emerging Markets Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000103328
<CLASS-CONTRACT-NAME>Columbia Acorn Emerging Markets Fund Class A
<CLASS-CONTRACT-TICKER-SYMBOL>CAGAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000103329
<CLASS-CONTRACT-NAME>Columbia Acorn Emerging Markets Fund Class C
<CLASS-CONTRACT-TICKER-SYMBOL>CGMCX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000103331
<CLASS-CONTRACT-NAME>Columbia Acorn Emerging Markets Fund Institutional Class
<CLASS-CONTRACT-TICKER-SYMBOL>CEFZX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122753
<CLASS-CONTRACT-NAME>Columbia Acorn Emerging Markets Fund Advisor Class
<CLASS-CONTRACT-TICKER-SYMBOL>CAERX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000122754
<CLASS-CONTRACT-NAME>Columbia Acorn Emerging Markets Fund Institutional 2 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CANRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000128887
<CLASS-CONTRACT-NAME>Columbia Acorn Emerging Markets Fund Institutional 3 Class
<CLASS-CONTRACT-TICKER-SYMBOL>CPHRX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>d478266d497.htm
<DESCRIPTION>COLUMBIA ACORN TRUST
<TEXT>
Document 1 - file: d478266d497.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g478266g1113180117145.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g478266g1113180117145.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g478266snap2.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g478266snap2.jpg

</DOCUMENT>
</SEC-DOCUMENT>