-----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, ByxYo1rTXbwi+PTTgJ1jegR4LTCCak9XCGBlIaS8JKisOzSraAy0rmYNPFNVARnK VcdpyaYXz5vNeeWg0n2xtg== 0001104659-06-064068.txt : 20060929 0001104659-06-064068.hdr.sgml : 20060929 20060929150746 ACCESSION NUMBER: 0001104659-06-064068 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 2 FILED AS OF DATE: 20060929 DATE AS OF CHANGE: 20060929 EFFECTIVENESS DATE: 20060929 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: 061117011 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 S000009184 Columbia Acorn Fund

C000024954 Columbia Acorn Fund Class A LACAX

C000024955 Columbia Acorn Fund Class B LACBX

C000024956 Columbia Acorn Fund Class C LIACX

C000024957 Columbia Acorn Fund Class Z ACRNX

0000002110 S000009185 Columbia Acorn International

C000024958 Columbia Acorn International Class A LAIAX

C000024959 Columbia Acorn International Class B LIABX

C000024960 Columbia Acorn International Class C LAICX

C000024961 Columbia Acorn International Class Z ACINX

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

0000002110 S000009187 Columbia Acorn Select

C000024966 Columbia Acorn Select Class A LTFAX

C000024967 Columbia Acorn Select Class B LTFBX

C000024968 Columbia Acorn Select Class C LTFCX

C000024969 Columbia Acorn Select Class Z ACTWX

0000002110 S000009188 Columbia Acorn International Select

C000024970 Columbia Acorn International Select Class A LAFAX

C000024971 Columbia Acorn International Select Class B LFFBX

C000024972 Columbia Acorn International Select Class C LFFCX

C000024973 Columbia Acorn International Select Class Z ACFFX

0000002110 S000009189 Columbia Thermostat Fund

C000024974 Columbia Thermostat Fund Class A CTFAX

C000024975 Columbia Thermostat Fund Class B CTFBX

C000024976 Columbia Thermostat Fund Class C CTFDX

C000024977 Columbia Thermostat Fund Class Z COTZX

497 1 a06-20371_1497.htm DEFINITIVE MATERIALS

Columbia Acorn Trust

Columbia Acorn Fund

Columbia Acorn International

Columbia Acorn USA

Columbia Acorn Select

Columbia Acorn International Select

Columbia Thermostat Fund

Supplement dated September 29, 2006 to the
Statement of Additional Information
dated May 1, 2006

The Funds listed above are each a “Fund” and collectively, the “Funds.” The Funds’ investment adviser, Columbia Wanger Asset Management, L.P. is referred to as “Columbia WAM.”

1. As of September 11, 2006, all of the trustees of Columbia Acorn Trust were elected as trustees of Wanger Advisors Trust.

2. The following language is added to the end of the section entitled “MANAGEMENT OF THE TRUST,” beginning on page 34 of the statement of additional information:

Certain Investment Activity Limitations

The overall investment activities of Columbia WAM and its affiliates may limit the investment opportunities for the Funds in certain markets in which limitations are imposed by regulators upon the amount of investment by affiliated investors, in the aggregate or in individual issuers. From time to time, a Fund’s activities also may be restricted because of regulatory restrictions applicable to Columbia WAM and its affiliates, and/or their internal policies.

INT-50/113913-0906

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