Columbia Acorn Trust

-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, KfZxUh6XisFsB4MeFd+KUHg7tUfOYFh9Ogn0Hp5FZwWOg/syk6QPfVAobeThu42M zJ1BIlaolN0IC+tLo/Yxhg== 0001193125-10-126958.txt : 20100524 0001193125-10-126958.hdr.sgml : 20100524 20100524130848 ACCESSION NUMBER: 0001193125-10-126958 CONFORMED SUBMISSION TYPE: 497J PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20100524 DATE AS OF CHANGE: 20100524 EFFECTIVENESS DATE: 20100524 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: 497J SEC ACT: 1933 Act SEC FILE NUMBER: 002-34223 FILM NUMBER: 10853181 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

0000002110 S000009184 Columbia Acorn Fund

C000024954 Columbia Acorn Fund Class A LACAX

C000024955 Columbia Acorn Fund Class B LACBX

C000024956 Columbia Acorn Fund Class C LIACX

C000024957 Columbia Acorn Fund Class Z ACRNX

0000002110 S000009185 Columbia Acorn International

C000024958 Columbia Acorn International Class A LAIAX

C000024959 Columbia Acorn International Class B LIABX

C000024960 Columbia Acorn International Class C LAICX

C000024961 Columbia Acorn International Class Z ACINX

0000002110 S000009186 Columbia Acorn USA

C000024962 Columbia Acorn USA Class A LAUAX

C000024963 Columbia Acorn USA Class B LAUBX

C000024964 Columbia Acorn USA Class C LAUCX

C000024965 Columbia Acorn USA Class Z AUSAX

0000002110 S000009187 Columbia Acorn Select

C000024966 Columbia Acorn Select Class A LTFAX

C000024967 Columbia Acorn Select Class B LTFBX

C000024968 Columbia Acorn Select Class C LTFCX

C000024969 Columbia Acorn Select Class Z ACTWX

0000002110 S000009188 Columbia Acorn International Select

C000024970 Columbia Acorn International Select Class A LAFAX

C000024971 Columbia Acorn International Select Class B LFFBX

C000024972 Columbia Acorn International Select Class C LFFCX

C000024973 Columbia Acorn International Select Class Z ACFFX

0000002110 S000009189 Columbia Thermostat Fund

C000024974 Columbia Thermostat Fund Class A CTFAX

C000024975 Columbia Thermostat Fund Class B CTFBX

C000024976 Columbia Thermostat Fund Class C CTFDX

C000024977 Columbia Thermostat Fund Class Z COTZX

497J 1 d497j.htm COLUMBIA ACORN TRUST Columbia Acorn Trust

COLUMBIA ACORN TRUST

227 W. MONROE STREET, SUITE 3000

CHICAGO, IL 60602

May 24, 2010

BY EDGAR

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Ladies and Gentlemen:

Columbia Acorn Trust

1933 Act Registration No. 002-34223

1940 Act Registration No. 811-01829

In accordance with Rule 497(j) of Regulation C under the Securities Act of 1933, Columbia Acorn Trust (the “Trust”) certifies that:

the forms of prospectuses that would have been filed under paragraph (c) of Rule 497 would not have differed from that contained in the most recent post-effective amendment to the Trust’s registration statement on Form N-1A; and

the text of the most recent post-effective amendment to the Trust’s registration statement was filed with the Commission via EDGAR on April 27, 2010.

Very truly yours,

COLUMBIA ACORN TRUST

By: /s/ Bruce H. Lauer

Bruce H. Lauer, Vice President, Secretary and Treasurer

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