0001193125-15-335325.txt : 20151001 0001193125-15-335325.hdr.sgml : 20151001 20151001161629 ACCESSION NUMBER: 0001193125-15-335325 CONFORMED SUBMISSION TYPE: 497K PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20151001 DATE AS OF CHANGE: 20151001 EFFECTIVENESS DATE: 20151001 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: 497K SEC ACT: 1933 Act SEC FILE NUMBER: 002-34223 FILM NUMBER: 151137203 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 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 C000094634 Columbia Acorn USA Class I CAUIX C000122740 Columbia Acorn USA Class R4 CUSAX C000122741 Columbia Acorn USA Class R5 CYSRX C000122742 Columbia Acorn USA Class Y CUSYX 497K 1 d74646d497k.htm COLUMBIA ACORN TRUST Columbia Acorn Trust

Supplement dated October 1, 2015

to the Prospectus and Summary Prospectus dated May 1, 2015,

as supplemented May 1, 2015, for the following Fund:

COLUMBIA ACORN TRUST

Columbia Acorn USA®

Effective October 1, 2015, as anticipated on May 1, 2015, Robert A. Mohn has stepped down from his portfolio management role with Columbia Acorn USA and from his roles as Domestic Chief Investment Officer of Columbia Wanger Asset Management, LLC and Vice President of Columbia Acorn Trust. William J. Doyle will continue in his current portfolio management role with the Fund.

Accordingly, the Prospectus and Summary Prospectus for the Fund are hereby supplemented immediately by removing all references to Robert A. Mohn that appear under the headings Summary of the Fund – Fund Management and More Information About the Fund – Primary Service Providers – Portfolio Managers.

Shareholders should retain this Supplement for future reference.

SUP115_12_002_(10/15)