-----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, FJ21WC6vPMT3FjcbrO13BvB/i6nzGd3H3dX2qwR+ZXmrlS+Z02zrv6jmuQx3t4m7 NnC6vW2DVSx763KJ7CM8uA== 0001104659-07-084105.txt : 20071119 0001104659-07-084105.hdr.sgml : 20071119 20071119152420 ACCESSION NUMBER: 0001104659-07-084105 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 2 FILED AS OF DATE: 20071119 DATE AS OF CHANGE: 20071119 EFFECTIVENESS DATE: 20071119 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: 071256202 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 a07-28575_1497.htm N-1A

COLUMBIA ACORN TRUST

Columbia^SM Acorn^® Fund

Columbia^SM Acorn International^®

Columbia^SM Acorn USA^®

Columbia^SM Acorn Select^SM

Columbia^SM Acorn International Select^SM

Columbia^SM Thermostat Fund^SM

(the “Funds”)

Supplement dated November 19, 2007 to the
Prospectuses dated May 1, 2007

Effective immediately, paragraph five of the section in the Funds’ prospectuses entitled “FUND POLICY ON TRADING OF FUND SHARES” is replaced in its entirety with the following:

Purchases, redemptions and exchanges made through the Columbia Funds’ Automatic Investment Plan, Systematic Withdrawal Plan or similar automated plans are not subject to the two-round-trip limit. The two-round-trip limit does not apply to payroll deduction contributions by retirement plan participants, transactions initiated by a retirement plan sponsor or certain other retirement plan transactions, including rollover transactions, loan repayments and disbursements, and required minimum distribution redemptions. Purchases, redemptions and exchanges made by Columbia Thermostat Fund are also not subject to the two round-trip limit. The two-round-trip limit may be modified for, or may not be applied to, accounts held by certain retirement plans to conform to plan limits, considerations relating to the Employee Retirement Income Security Act of 1974 or regulations of the Department of Labor, and for certain asset allocation or wrap programs.

For Columbia Acorn International And Columbia Acorn International Select, effective immediately, the following is added after the last bullet point in paragraph twelve of the section in these Funds’ prospectuses entitled “FUND POLICY ON TRADING OF FUND SHARES”:

• the following retirement plan transactions:

• payroll deduction contributions by retirement plan participants

• transactions initiated by a retirement plan sponsor

• certain other retirement plan transactions consisting of rollover transactions, loan repayments and disbursements, and required minimum distribution redemptions

INT-47/136874-1107

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