497 1 april_2.txt SUPPLEMENT LIBERTY ACORN INTERNATIONAL Class Z Shares Supplement dated April 2, 2003 to Prospectus, as supplemented, dated May 1, 2002 Effective March 4, 2003, the Fund may waive the 2% redemption fee for 401(k) plans that are in the process of liquidating their Fund investments. LIBERTY ACORN FOREIGN FORTY Class Z Shares Supplement dated April 2, 2003 to Prospectus, as supplemented, dated May 1, 2002 Effective March 4, 2003, the Fund may waive the 2% redemption fee for 401(k) plans that are in the process of liquidating their Fund investments. LIBERTY ACORN FUND LIBERTY ACORN INTERNATIONAL LIBERTY ACORN USA LIBERTY ACORN TWENTY LIBERTY ACORN FOREIGN FORTY Class Z Shares Supplement dated April 2, 2003 to Prospectus, as supplemented, dated May 1, 2002 Effective March 4, 2003, each of Liberty Acorn International and Liberty Acorn Foreign Forty may waive the 2% redemption fee for 401(k) plans that are in the process of liquidating their investments in the Fund. LIBERTY ACORN FUND LIBERTY ACORN INTERNATIONAL LIBERTY ACORN USA LIBERTY ACORN TWENTY LIBERTY ACORN FOREIGN FORTY COLUMBIA THERMOSTAT FUND Supplement dated April 2, 2003 to Statement of Additional Information, as supplemented, dated September 25, 2002 Effective March 4, 2003, each of Liberty Acorn International and Liberty Acorn Foreign Forty may waive the 2% redemption fee for 401(k) plans that are in the process of liquidating their Fund investments.