# EDGAR Filing Document

**Accession Number:** 0000002110
**File Stem:** 0001193125-23-029602
**Filing Date:** 2023-2
**Character Count:** 11075
**Document Hash:** c26618f9def6cab070cc4bae404d27ea
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-029602.hdr.sgml**: 20230209

**ACCESSION NUMBER**: 0001193125-23-029602

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230209

**DATE AS OF CHANGE**: 20230209

**EFFECTIVENESS DATE**: 20230209

**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:** 23605165

**BUSINESS ADDRESS:**
- **STREET 1:** 71 S. WACKER DRIVE, SUITE 2500
- **CITY:** CHICAGO
- **STATE:** IL
- **ZIP:** 60606
- **BUSINESS PHONE:** 3126349200

**MAIL ADDRESS:**
- **STREET 1:** 71 S. WACKER DRIVE, SUITE 2500
- **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

## Series and Classes Contracts Data

### Columbia Acorn Fund (Series ID: S000009184)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                | Ticker Symbol | Class ID   |
| Columbia Acorn Fund Class A               | LACAX         | C000024954 |
| Columbia Acorn Fund Class C               | LIACX         | C000024956 |
| Columbia Acorn Fund Institutional Class   | ACRNX         | C000024957 |
| Columbia Acorn Fund Advisor Class         | CEARX         | C000122735 |
| Columbia Acorn Fund Institutional 2 Class | CRBRX         | C000122736 |
| Columbia Acorn Fund Institutional 3 Class | CRBYX         | C000122737 |

---

### Columbia Acorn USA (Series ID: S000009186)

---

|  |  |  |
|:---|:---|:---|
| Class Name                               | Ticker Symbol | Class ID   |
| Columbia Acorn USA Class A               | LAUAX         | C000024962 |
| Columbia Acorn USA Class C               | LAUCX         | C000024964 |
| Columbia Acorn USA Institutional Class   | AUSAX         | C000024965 |
| Columbia Acorn USA Advisor Class         | CUSAX         | C000122740 |
| Columbia Acorn USA Institutional 2 Class | CYSRX         | C000122741 |
| Columbia Acorn USA Institutional 3 Class | CUSYX         | C000122742 |

---

## Series and Classes Contracts Data

### Columbia Acorn Fund (Series ID: S000009184)

| Class ID   | Class Name                                | Ticker Symbol   |
|:---|:---|:---|
| C000024954 | Columbia Acorn Fund Class A               | LACAX           |
| C000024956 | Columbia Acorn Fund Class C               | LIACX           |
| C000024957 | Columbia Acorn Fund Institutional Class   | ACRNX           |
| C000122735 | Columbia Acorn Fund Advisor Class         | CEARX           |
| C000122736 | Columbia Acorn Fund Institutional 2 Class | CRBRX           |
| C000122737 | Columbia Acorn Fund Institutional 3 Class | CRBYX           |

### Columbia Acorn USA (Series ID: S000009186)

| Class ID   | Class Name                               | Ticker Symbol   |
|:---|:---|:---|
| C000024962 | Columbia Acorn USA Class A               | LAUAX           |
| C000024964 | Columbia Acorn USA Class C               | LAUCX           |
| C000024965 | Columbia Acorn USA Institutional Class   | AUSAX           |
| C000122740 | Columbia Acorn USA Advisor Class         | CUSAX           |
| C000122741 | Columbia Acorn USA Institutional 2 Class | CYSRX           |
| C000122742 | Columbia Acorn USA Institutional 3 Class | CUSYX           |

#### Supplement dated February 9, 2023
to the Prospectus, Summary Prospectus, and Statement of Additional Information (SAI), as supplemented, of the

following fund (the Fund):

---

| | |
|:---|:---|
| &nbsp;&nbsp;**Fund** | &nbsp;&nbsp;**Prospectus, Summary Prospectus and SAI Dated** |
| &nbsp;&nbsp;Columbia Acorn Trust |  |
| &nbsp;&nbsp; Columbia Acorn<sup>®</sup> Fund | &nbsp;&nbsp;May 1, 2022 |

---

*Effective February 10, 2023 (the Effective Date), the portfolio manager information under the caption "Fund Management" in the Summary Prospectus and in the "Summary of the Fund" section of the Prospectus is hereby superseded and replaced with the following:*

*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*

<br> ---

| | | | |
|:---|:---|:---|:---|
| **Portfolio Management** | &nbsp;&nbsp;&nbsp;&nbsp;**Title** | &nbsp;&nbsp;&nbsp;&nbsp;**Role with Fund** | &nbsp;&nbsp;&nbsp;&nbsp;**Service with the Fund Since** |
| Erika K. Maschmeyer, CFA | &nbsp;&nbsp;&nbsp;&nbsp;Director of Research (U.S.),<br> Portfolio Manager and Analyst | &nbsp;&nbsp;&nbsp;&nbsp;Lead Portfolio Manager<br> since February 2023 | &nbsp;&nbsp;&nbsp;&nbsp;2016 |
| John L. Emerson, CFA | &nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager and Analyst | &nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager<br> since April 2021 | &nbsp;&nbsp;&nbsp;&nbsp;2003 |

---

*On the Effective Date, the information under the "Primary Service Provider Contracts" caption in the "More Information About the Fund" section of the Prospectus is hereby revised to remove the fifth and sixth paragraphs under the sub-caption "The Investment Manager" and is further revised to supersede and replace the information under the sub-caption "Portfolio Managers" with the following:*

*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*

<br> ---

| | | | |
|:---|:---|:---|:---|
| **Portfolio Management** | &nbsp;&nbsp;&nbsp;&nbsp;**Title** | &nbsp;&nbsp;&nbsp;&nbsp;**Role with Fund** | &nbsp;&nbsp;&nbsp;&nbsp;**Service with the Fund Since** |
| Erika K. Maschmeyer, CFA | &nbsp;&nbsp;&nbsp;&nbsp;Director of Research (U.S.),<br> Portfolio Manager and Analyst | &nbsp;&nbsp;&nbsp;&nbsp;Lead Portfolio Manager<br> since February 2023 | &nbsp;&nbsp;&nbsp;&nbsp;2016 |
| John L. Emerson, CFA | &nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager and Analyst | &nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager<br> since April 2021 | &nbsp;&nbsp;&nbsp;&nbsp;2003 |

---

**Ms. Maschmeyer has been associated with the Investment Manager as an investment professional since 2016. Ms. Maschmeyer heads the Investment Manager's U.S. equity research efforts and has been a Vice President of the Trust since March 2020. Prior to joining the Investment Manager, Ms. Maschmeyer was a research analyst at an investment advisory firm where she was responsible for U.S. consumer discretionary/staples investments. Ms. Maschmeyer began her investment career in 2001 and earned a B.A. from Denison University and an M.B.A from the University of Chicago.**

**Mr. Emerson has been associated with the Investment Manager or its predecessors as an investment professional since 2003 and has been a Vice President of the Trust since March 2020. Prior to joining the Investment Manager, Mr. Emerson was an analyst at an equity research firm. Mr. Emerson began his investment career in 2002 and earned a B.S. from the University of Missouri and an M.B.A from the University of Chicago.**

*The rest of the Prospectus and Summary Prospectus remain unchanged.*

*On the Effective Date, all references to Daniel Cole in the SAI are hereby removed. The rest of the SAI remains unchanged.* 

*Shareholders should retain this Supplement for future reference.*

SUP110_12_010_(02/23)

------

to the Prospectus, Summary Prospectus, and Statement of Additional Information (SAI), each as supplemented, of

the following fund (the Fund):

---

| | |
|:---|:---|
| &nbsp;&nbsp;**Fund** | &nbsp;&nbsp;**Prospectus, Summary Prospectus and SAI Dated** |
| &nbsp;&nbsp;Columbia Acorn Trust |  |
| &nbsp;&nbsp; Columbia Acorn USA<sup>®</sup> | &nbsp;&nbsp;May 1, 2022 |

---

*Effective February 10, 2023 (the Effective Date), the portfolio manager information under the caption "Fund Management" in the Summary Prospectus and in the "Summary of the Fund" section of the Prospectus is hereby superseded and replaced with the following:*

*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*

<br> ---

| | | | |
|:---|:---|:---|:---|
| **Portfolio Management** | &nbsp;&nbsp;&nbsp;&nbsp;**Title** | &nbsp;&nbsp;&nbsp;&nbsp;**Role with Fund** | &nbsp;&nbsp;&nbsp;&nbsp;**Service with the Fund Since** |
| Erika K. Maschmeyer, CFA | &nbsp;&nbsp;&nbsp;&nbsp;Director of Research (U.S.),<br> Portfolio Manager and Analyst | &nbsp;&nbsp;&nbsp;&nbsp;Lead Portfolio Manager<br> since February 2023 | &nbsp;&nbsp;&nbsp;&nbsp;2016 |
| John L. Emerson, CFA | &nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager and Analyst | &nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager<br> since April 2021 | &nbsp;&nbsp;&nbsp;&nbsp;2003 |

---

*On the Effective Date, the information under the "Primary Service Provider Contracts" caption in the "More Information About the Fund" section of the Prospectus is hereby revised to remove the fifth and sixth paragraphs under the sub-caption "The Investment Manager" and is further revised to supersede and replace the information under the sub-caption "Portfolio Managers" with the following:*

*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*

<br> ---

| | | | |
|:---|:---|:---|:---|
| **Portfolio Management** | &nbsp;&nbsp;&nbsp;&nbsp;**Title** | &nbsp;&nbsp;&nbsp;&nbsp;**Role with Fund** | &nbsp;&nbsp;&nbsp;&nbsp;**Service with the Fund Since** |
| Erika K. Maschmeyer, CFA | &nbsp;&nbsp;&nbsp;&nbsp;Director of Research (U.S.),<br> Portfolio Manager and Analyst | &nbsp;&nbsp;&nbsp;&nbsp;Lead Portfolio Manager<br> since February 2023 | &nbsp;&nbsp;&nbsp;&nbsp;2016 |
| John L. Emerson, CFA | &nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager and Analyst | &nbsp;&nbsp;&nbsp;&nbsp;Portfolio Manager<br> since April 2021 | &nbsp;&nbsp;&nbsp;&nbsp;2003 |

---

**Ms. Maschmeyer has been associated with the Investment Manager as an investment professional since 2016. Ms. Maschmeyer heads the Investment Manager's U.S. equity research efforts and has been a Vice President of the Trust since March 2020. Prior to joining the Investment Manager, Ms. Maschmeyer was a research analyst at an investment advisory firm where she was responsible for U.S. consumer discretionary/staples investments. Ms. Maschmeyer began her investment career in 2001 and earned a B.A. from Denison University and an M.B.A from the University of Chicago.**

**Mr. Emerson has been associated with the Investment Manager or its predecessors as an investment professional since 2003 and has been a Vice President of the Trust since March 2020. Prior to joining the Investment Manager, Mr. Emerson was an analyst at an equity research firm. Mr. Emerson began his investment career in 2002 and earned a B.S. from the University of Missouri and an M.B.A from the University of Chicago.**

*The rest of the Prospectus and Summary Prospectus remain unchanged.*

*On the Effective Date, all references to Daniel Cole in the SAI are hereby removed. The rest of the SAI remains unchanged.* 

*Shareholders should retain this Supplement for future reference.*

SUP115_12_010_(02/23)