# EDGAR Filing Document

**Accession Number:** 0000770540
**File Stem:** 0001193125-26-103536
**Filing Date:** 2026-3
**Character Count:** 2995
**Document Hash:** 7ce2062b9fab411ff4e99f85bb47ca40
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-103536.hdr.sgml**: 20260312

**ACCESSION NUMBER**: 0001193125-26-103536

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260312

**DATE AS OF CHANGE**: 20260312

**EFFECTIVENESS DATE**: 20260312

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Natixis Funds Trust I
- **CENTRAL INDEX KEY:** 0000770540

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-98326
- **FILM NUMBER:** 26746596

**BUSINESS ADDRESS:**
- **STREET 1:** 888 BOYLSTON STREET
- **STREET 2:** 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199
- **BUSINESS PHONE:** 617-449-2810

**MAIL ADDRESS:**
- **STREET 1:** 888 BOYLSTON STREET
- **STREET 2:** 8TH FLOOR
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02199

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** IXIS Advisor Funds Trust I
- **DATE OF NAME CHANGE:** 20050502

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CDC NVEST FUNDS TRUST I
- **DATE OF NAME CHANGE:** 20010503

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** NVEST FUNDS TRUST I
- **DATE OF NAME CHANGE:** 20000202

## Series and Classes Contracts Data

### Natixis U.S. Equity Opportunities Fund (Series ID: S000006658)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class A    | NEFSX         | C000018161 |
| Class C    | NECCX         | C000018163 |
| Class Y    | NESYX         | C000018164 |
| Class T    | NUSTX         | C000188559 |
| Class N    | NESNX         | C000190732 |

---

## Series and Classes Contracts Data

### Natixis U.S. Equity Opportunities Fund (Series ID: S000006658)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000018161 | Class A      | NEFSX           |
| C000018163 | Class C      | NECCX           |
| C000018164 | Class Y      | NESYX           |
| C000188559 | Class T      | NUSTX           |
| C000190732 | Class N      | NESNX           |

*Supplement dated March 12, 2026 to the Summary Prospectuses, Prospectus and Statement of Additional Information ("SAI"), each dated May 1, 2025, as may be revised or supplemented from time to time.* 

**Natixis Oakmark Fund** 

**Natixis U.S. Equity Opportunities Fund** 

**(the "Funds")** 

***Effective May 1, 2026, Michael J. Mangan will no longer serve as a Portfolio Manager of the Natixis Oakmark Fund and the Harris Associates – Large Cap Value sleeve of the Natixis U.S. Equity Opportunities Fund.***

***Accordingly, effective May 1, 2026, all references and corresponding disclosure related to Mr. Mangan in the Funds Summary Prospectuses, Prospectus and SAI will be deleted.***

Robert F. Bierig, Michael A. Nicolas and William C. Nygren will remain as Portfolio Managers of the Natixis Oakmark Fund and the Harris Associates – Large Cap Value sleeve of the Natixis U.S. Equity Opportunities Fund.