Columbia Acorn Trust

09/27/2024 | Press release | Distributed by Public on 09/27/2024 08:12

Summary Prospectus by Investment Company - Form 497K

COLUMBIA ACORN TRUST
Supplement dated September 27, 2024to the Prospectus, Summary Prospectus and Statement of Additional Information (SAI), each as supplemented, of each of the following funds:
Fund
Prospectus, Summary Prospectus and SAI Dated
Columbia Acorn Trust
  Columbia Acorn Fund
5/1/2024
  Columbia Acorn International
5/1/2024
  Columbia Acorn International Select
5/1/2024
  Columbia Thermostat Fund
5/1/2024
Class S information on each Fund's Prospectus and Summary Prospectus front covers is hereby superseded and replaced with the following:
For Columbia Acorn Fund:
Class
Ticker Symbol
S(a)
ACRSX
(a)
Class S will be operational on or about October 2, 2024.
For Columbia Acorn International:
Class
Ticker Symbol
S(a)
CCIDX
(a)
Class S will be operational on or about October 2, 2024.
For Columbia Acorn International Select:
Class
Ticker Symbol
S(a)
ACFEX
(a)
Class S will be operational on or about October 2, 2024.
For Columbia Thermostat Fund:
Class
Ticker Symbol
S(a)
COTDX
(a)
Class S will be operational on or about October 2, 2024.
Also Class S information on the front cover of the SAI is hereby superseded and replaced with the following:
Fund
Class S(a)
Columbia Acorn Fund
ACRSX
Columbia Acorn International
CCIDX
Columbia Acorn International Select
ACFEX
Columbia Thermostat Fund
COTDX
(a)
Class S will be operational on or about October 2, 2024.
Shareholders should retain this Supplement for future reference.
SUP000_00_163_(09/24)