COLUMBIA ACORN TRUST
227 W. MONROE STREET, SUITE 3000
CHICAGO, IL 60602
May 6, 2011
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:
a. | the forms of prospectuses and statement of additional information for the series of the Trust that would have been filed under paragraph (c) of Rule 497 would not have differed from those contained in the most recent post-effective amendment to the Trusts registration statement on Form N-1A; and |
b. | the text of the most recent post-effective amendment to the Trusts registration statement was filed with the Commission via EDGAR on April 29, 2011. |
Very truly yours,
COLUMBIA ACORN TRUST
By : /s/ Bruce H. Lauer
Bruce H. Lauer, Vice President, Secretary and Treasurer