-----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, Sp2v8mRVCG2fsWvnjW/6wpRcLQZU2AUhrJqVzQuaEAmspBsQSeqzQbOJZtMzIPX8 zMU9S1D+OFfA2BMQvayRyA== 0000891804-05-002992.txt : 20051004 0000891804-05-002992.hdr.sgml : 20051004 20051004163243 ACCESSION NUMBER: 0000891804-05-002992 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20051004 DATE AS OF CHANGE: 20051004 EFFECTIVENESS DATE: 20051004 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: 051122107 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 497 1 file002.txt COLUMBIA ACORN TRUST Columbia Acorn Trust Columbia Acorn USA Supplement dated October 4, 2005 to Prospectus dated May 1, 2005 On September 27, 2005, the board of trustees, including a majority of the independent trustees, negotiated with Columbia Wanger Asset Management, L.P. ("CWAM") and approved an amendment to the investment advisory agreement between the Trust and CWAM to provide an additional breakpoint in the advisory fees paid by Columbia Acorn USA to CWAM, reducing fees by 0.05% on net assets in excess of $500 million. Effective immediately, the advisory fees paid by Columbia Acorn USA to CWAM will be as follows: Fee Rate Asset Levels 0.94% Up to $200 million 0.89% $200 million to $500 million 0.84% $500 million and over SUP-47/90838-1005 Columbia Acorn Trust Columbia Acorn USA Supplement dated October 4, 2005 to Statement of Additional Information dated May 1, 2005 On September 27, 2005, the board of trustees, including a majority of the independent trustees, negotiated with Columbia Wanger Asset Management, L.P. ("CWAM") and approved an amendment to the investment advisory agreement between the Trust and CWAM to provide an additional breakpoint in the advisory fees paid by Columbia Acorn USA to CWAM, reducing fees by 0.05% on the net asset levels in excess of $500 million. Effective immediately, the advisory fees paid by Columbia Acorn USA as shown in the advisory fees chart on page 41 of the Statement of Additional Information are deleted and replaced as follows: AVERAGE DAILY NET ASSETS ANNUAL FEE RATE Columbia Acorn USA Up to $200 million 0.94% $200 million to $500 million 0.89% $500 million and over 0.84% SUP-39/91069-1005 -----END PRIVACY-ENHANCED MESSAGE-----