<SEC-DOCUMENT>0001193125-19-306127-index.html : 20191204
<SEC-HEADER>0001193125-19-306127.hdr.sgml : 20191204
<ACCEPTANCE-DATETIME>20191204152903
ACCESSION NUMBER:		0001193125-19-306127
CONFORMED SUBMISSION TYPE:	40-17G
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20191204
DATE AS OF CHANGE:		20191204
EFFECTIVENESS DATE:		20191204

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:		40-17G
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-01829
		FILM NUMBER:		191268114

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>40-17G
<SEQUENCE>1
<FILENAME>d826804d4017g.htm
<DESCRIPTION>COLUMBIA ACORN TRUST
<TEXT>
Document 1 - file: d826804d4017g.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g826804dsp-1.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g826804dsp-1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g826804dsp003a.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g826804dsp003a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g826804dsp003b.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g826804dsp003b.jpg

</DOCUMENT>
</SEC-DOCUMENT>