# EDGAR Filing Document

**Accession Number:** 0000773757
**File Stem:** 0001193125-26-160581
**Filing Date:** 2026-4
**Character Count:** 6991
**Document Hash:** fda9b689a0289bc62bd9f5c59dc5de72
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-160581.hdr.sgml**: 20260417

**ACCESSION NUMBER**: 0001193125-26-160581

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260417

**DATE AS OF CHANGE**: 20260417

**EFFECTIVENESS DATE**: 20260417

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** COLUMBIA FUNDS SERIES TRUST I
- **CENTRAL INDEX KEY:** 0000773757

**ORGANIZATION NAME:**
- **EIN:** 363376651
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0630

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-99356
- **FILM NUMBER:** 26870010

**BUSINESS ADDRESS:**
- **STREET 1:** 290 CONGRESS STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210
- **BUSINESS PHONE:** 800-345-6611

**MAIL ADDRESS:**
- **STREET 1:** 290 CONGRESS STREET
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** COLUMBIA FUNDS TRUST IX
- **DATE OF NAME CHANGE:** 20031107

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LIBERTY STEIN ROE FUNDS MUNICIPAL TRUST
- **DATE OF NAME CHANGE:** 19991025

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** STEINROE MUNICIPAL TRUST
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### Multi-Manager International Equity Strategies Fund (Series ID: S000061733)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                                             | Ticker Symbol | Class ID   |
| Multi-Manager International Equity Strategies Fund Institutional Class | CMIEX         | C000199958 |

---

## Series and Classes Contracts Data

### Multi-Manager International Equity Strategies Fund (Series ID: S000061733)

| Class ID   | Class Name                                                             | Ticker Symbol   |
|:---|:---|:---|
| C000199958 | Multi-Manager International Equity Strategies Fund Institutional Class | CMIEX           |

**Supplement dated April 17, 2026**

to the Prospectus and Summary Prospectus of the following fund:

---

| | |
|:---|:---|
| **Fund** | **Prospectus and Summary Prospectus Dated** |
| Columbia Funds Series Trust I |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Multi-Manager International Equity Strategies Fund | 1/1/2026 |

---

*Peter Rathjens will be stepping down as a Co-Portfolio Manager of the Arrowstreet Capital, Limited Partnership (Arrowstreet) sleeve of the Fund effective June 30, 2026. Accordingly, as of that date, all references to Peter Rathjens in the Fund's Prospectus and Summary Prospectus will be removed. In addition, Samuel Thompson is being added as a Co-Portfolio Manager of the Arrowstreet sleeve of the Fund. Accordingly, effective immediately the following changes are hereby made to the Fund's Prospectus and Summary Prospectus.*

*The portfolio manager information for Arrowstreet under the heading "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:*

**Subadviser:** Arrowstreet Capital, Limited Partnership (Arrowstreet)

---

| | | | |
|:---|:---|:---|:---|
| **Portfolio Management** | **Title** | **Role with Fund** | **Managed Fund Since** |
| Derek Vance, CFA | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Chief Investment Officer of <br> Arrowstreet<br>| Co-Portfolio Manager | 2020 |
| Christopher Malloy, Ph.D. | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Head of Research of <br> Arrowstreet<br>| Co-Portfolio Manager | 2020 |
| Julia Yuan, CFA | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Head of Alpha Development <br> of Arrowstreet<br>| Co-Portfolio Manager | 2024 |
| Brandon Berger | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Head of Portfolio <br> Management of Arrowstreet<br>| Co-Portfolio Manager | March 2025 |
| Samuel Thompson, Ph.D. | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Head of Investment <br> Processes of Arrowstreet<br>| Co-Portfolio Manager | March 2026 |
| Peter Rathjens, Ph.D.\* | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Member of Investment Team <br> of Arrowstreet<br>| Co-Portfolio Manager | 2018 |

---

\*

Effective June 30, 2026, Mr. Rathjens will no longer serve as a portfolio manager of the Fund.

*The rest of the section remains the same.*

*The portfolio manager information for Arrowstreet under the heading "Primary Service Provider Contracts – Portfolio Managers" in the "More Information About the Fund" section of the Prospectus is hereby superseded and replaced with the following:*

**Subadviser:** Arrowstreet Capital, Limited Partnership (Arrowstreet)

---

| | | | |
|:---|:---|:---|:---|
| **Portfolio Management** | **Title** | **Role with Fund** | **Managed Fund Since** |
| Derek Vance, CFA | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Chief Investment Officer of <br> Arrowstreet<br>| Co-Portfolio Manager | 2020 |
| Christopher Malloy, Ph.D. | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Head of Research of <br> Arrowstreet<br>| Co-Portfolio Manager | 2020 |
| Julia Yuan, CFA | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Head of Alpha Development <br> of Arrowstreet<br>| Co-Portfolio Manager | 2024 |
| Brandon Berger | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Head of Portfolio <br> Management of Arrowstreet<br>| Co-Portfolio Manager | March 2025 |
| Samuel Thompson, Ph.D. | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Head of Investment <br> Processes of Arrowstreet<br>| Co-Portfolio Manager | March 2026 |
| Peter Rathjens, Ph.D.\* | &nbsp;&nbsp;&nbsp;&nbsp; Partner and Member of Investment Team <br> of Arrowstreet<br>| Co-Portfolio Manager | 2018 |

---

\*

Effective June 30, 2026, Mr. Rathjens will no longer serve as a portfolio manager of the Fund.

**Mr. Vance** joined Arrowstreet in 2008. Mr. Vance began his investment career in 2007 and earned an A.B. from Harvard College.

**Mr. Malloy** joined Arrowstreet in 2019. Mr. Malloy began his investment career in 2003 and earned a Ph.D. and M.B.A. from The University of Chicago Graduate School of Business, and a B.A. from Yale University.

**Ms. Yuan** joined Arrowstreet in 2012. Ms. Yuan began her investment career in 2012 and earned an M.S. from Massachusetts Institute of Technology and a B.S. from Guanghua School of Management, Peking University.

**Mr. Berger** joined Arrowstreet in 2013. Mr. Berger began his investment career in 2010 and earned an M.B.A. from the Fordham Gabelli School of Business and a B.S. from Fordham University.

**Mr. Thompson** joined Arrowstreet in 2006. Mr. Thompson began his investment career in 2006 and earned a Ph.D. and M.A. from the University of California, Berkeley, and a B.A. from Yale University.

SUP302_08_013_(04/26)

------

**Mr. Rathjens** joined Arrowstreet in 1999. Mr. Rathjens began his investment career in 1983 and earned a Ph.D. and M.A. from Princeton University and a B.A. from Oberlin College.

*The rest of the section remains the same.*

*Shareholders should retain this Supplement for future reference.*

SUP302_08_013_(04/26)

------