COLUMBIA ACORN TRUST 

71 S. WACKER DRIVE, SUITE 2500 

CHICAGO, ILLINOIS 60606 

April 15, 2020  

VIA EDGAR TRANSMISSION 

U.S. Securities and Exchange Commission  

100 F Street, N.E.  

Washington, D.C. 20549  

RE:  Columbia Acorn Trust  

Registration Statement on Form N-14 (File No. 333-236783)  

Ladies and Gentlemen:  

In accordance with paragraph (j) of Rule 497 under the Securities Act of 1933 (the “Securities Act”), Columbia Acorn Trust (the “Trust”) certifies that (i) the form of prospectus and statement of additional information that would have been filed under paragraph (b) of Rule 497 under the Securities Act would not have differed from that contained in the Form N-14 registration statement for the Trust (Post-Effective Amendment No. 1) (the “Registration Statement”), and (ii) the Registration Statement was filed electronically with the Securities and Exchange Commission on April 9, 2020 via EDGAR (Accession Number 0001193125-20-101713).  

Very truly yours,
COLUMBIA ACORN TRUST
By:	/s/ Matthew A. Litfin
	Matthew A. Litfin, Co-President
By:	/s/ Louis J. Mendes
	Louis J. Mendes, Co-President