0001193125-16-699602.txt : 20160901 0001193125-16-699602.hdr.sgml : 20160901 20160901160056 ACCESSION NUMBER: 0001193125-16-699602 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20160901 DATE AS OF CHANGE: 20160901 EFFECTIVENESS DATE: 20160901 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: 161865829 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 S000009189 Columbia Thermostat Fund C000024974 Columbia Thermostat Fund Class A CTFAX C000024976 Columbia Thermostat Fund Class C CTFDX C000024977 Columbia Thermostat Fund Class Z COTZX C000122749 Columbia Thermostat Fund Class R4 CTORX C000122750 Columbia Thermostat Fund Class R5 CQTRX C000122751 Columbia Thermostat Fund Class Y CYYYX 497 1 d247678d497.htm COLUMBIA ACORN TRUST Columbia Acorn Trust
Supplement dated September 1, 2016
to the Prospectus and Summary Prospectus, each as supplemented, of the following fund:
Fund Prospectus and Summary Prospectus Dated
Columbia Acorn Trust  
 Columbia Thermostat Fund 5/1/2016
Christopher J. Olson, CFA, a co-portfolio manager of Columbia Thermostat Fund (the "Fund") and Vice President of Columbia Acorn Trust, has announced his intention to retire from the industry and will step down from these roles effective December 31, 2016. David L. Frank, current co-portfolio manager of Columbia Thermostat Fund, will continue as sole portfolio manager of the Fund after that date.  Mr. Olson will begin transitioning portfolio management responsibilities immediately and will remain available through the end of the year to ensure a smooth transition in management.
Shareholders should retain this Supplement for future reference.
SUP235_12_003_(09/16)

Supplement dated September 1, 2016
to the Statement of Additional Information (the "SAI"), as supplemented, of the following fund:
Fund SAI Dated
Columbia Acorn Trust  
 Columbia Thermostat Fund 5/1/2016
Christopher J. Olson, CFA, a co-portfolio manager of Columbia Thermostat Fund (the "Fund") and Vice President of Columbia Acorn Trust, has announced his intention to retire from the industry and will step down from these roles effective December 31, 2016. David L. Frank, current co-portfolio manager of Columbia Thermostat Fund, will continue as sole portfolio manager of the Fund after that date.  Mr. Olson will begin transitioning portfolio management responsibilities immediately and will remain available through the end of the year to ensure a smooth transition in management.
Shareholders should retain this Supplement for future reference.
SUP900_00_009_(09/16)