# EDGAR Filing Document

**Accession Number:** 0000770540
**File Stem:** 0001193125-25-285386
**Filing Date:** 2025-11
**Character Count:** 6217
**Document Hash:** 0093daa299305a1f5257c79eeb916d4f
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-285386.hdr.sgml**: 20251118

**ACCESSION NUMBER**: 0001193125-25-285386

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251118

**DATE AS OF CHANGE**: 20251118

**EFFECTIVENESS DATE**: 20251118

**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:** 251492987

**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

### Loomis Sayles Core Plus Bond Fund (Series ID: S000006660)

---

|  |  |  |
|:---|:---|:---|
| Class Name | Ticker Symbol | Class ID   |
| Class A    | NEFRX         | C000018168 |
| Class C    | NECRX         | C000018170 |
| Class Y    | NERYX         | C000018171 |
| Class N    | NERNX         | C000125481 |
| Class T    | LCPTX         | C000188560 |

---

## Series and Classes Contracts Data

### Loomis Sayles Core Plus Bond Fund (Series ID: S000006660)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000018168 | Class A      | NEFRX           |
| C000018170 | Class C      | NECRX           |
| C000018171 | Class Y      | NERYX           |
| C000125481 | Class N      | NERNX           |
| C000188560 | Class T      | LCPTX           |

*Supplement dated November 18, 2025 to the Summary Prospectus, Prospectus and Statement of Additional Information ("SAI"), each dated February 1, 2025, as may be revised or supplemented from time to time.* 

**Loomis Sayles Core Plus Bond Fund** 

**(the "Fund")** 

***Effective September 30, 2026, Peter W. Palfrey has elected to retire and will no longer serve as a portfolio manager of the Fund, effective June 30, 2026.***

***Accordingly, effective June 30, 2026, all references and corresponding disclosure related to Mr. Palfrey in the Fund's Summary Prospectus, Prospectus and SAI will be deleted.***

Richard G. Raczkowski will remain as Lead Portfolio Manager of the Fund, and Ian Anderson and Barath W. Sankaran will remain as Agency MBS Portfolio Managers for the Fund. ****

Additionally, effective June 30, 2026, Michael F. Gladchun will join the portfolio management team as Lead Portfolio Manager alongside Mr. Raczkowski.

***Accordingly, effective June 30, 2026 the information under the subsection "Portfolio Managers" in the "Management" section in the Fund's Summary Prospectus is revised to include the following:***

Michael F. Gladchun, Portfolio Manager at the Advisor, has served as co-lead portfolio manager of the Fund since 2026.

***Effective June 30, 2026, the subsection "Meet the Funds' Portfolio Managers" under the section "Management Team" in the Prospectus is revised to include the following:***

**Michael F. Gladchun** – Michael F. Gladchun has served as co-lead portfolio manager of the Loomis Sayles Core Plus Bond Fund since 2026. Mr. Gladchun, Portfolio Manager at Loomis Sayles, began his investment career in 2000 and joined Loomis Sayles in 2004. Mr. Gladchun received his B.A. from the University of Vermont, an M.B.A. from Boston University, and has over 24 years of investment experience.

------

***Effective June 30, 2026, the sub-sections "Portfolio Managers' Management of Other Accounts" and "Portfolio Managers' Ownership of Fund Shares" within the section "Portfolio Management Information" of the SAI are amended to include the following:***

**Portfolio Managers' Management of Other Accounts** 

The following table provides information on the other accounts managed by Mr. Gladchun as of September 30, 2025:

---

| | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Registered Investment<br>Companies** | **Registered Investment<br>Companies** | **Registered Investment<br>Companies** | **Registered Investment<br>Companies** | **Other Pooled Investment**<br>**Vehicles** | **Other Pooled Investment**<br>**Vehicles** | **Other Pooled Investment**<br>**Vehicles** | **Other Pooled Investment**<br>**Vehicles** | **Other Accounts** | **Other Accounts** | **Other Accounts** | **Other Accounts** |
| | **Other<br>Accounts<br>Managed** | **Other<br>Accounts<br>Managed** | **Advisory Fee<br>is Based on<br>Performance** | **Advisory Fee<br>is Based on<br>Performance** | **Other Accounts<br>Managed** | **Other Accounts<br>Managed** | **Advisory fee<br>is Based on<br>Performance** | **Advisory fee<br>is Based on<br>Performance** | **Other Accounts<br>Managed** | **Other Accounts<br>Managed** | **Advisory Fee<br>is Based on<br>Performance** | **Advisory Fee<br>is Based on<br>Performance** |
| **Name of Portfolio Manager** | **# of<br>Accts** | **Total<br>Assets** | **# of<br>Accts** | **Total<br>Assets** | **# of<br>Accts** | **Total**<br>**Assets** | **# of<br>Accts** | **Total<br>Assets** | **# of<br>Accts** | **Total**<br>**Assets** | **# of<br>Accts** | **Total<br>Assets** |
|  Michael F. Gladchun | 0 | $0 | 0 | $0 | 1 | $92.4 million | 0 | $0 | 4 | $466.8 million | 0 | $0 |

---

**Portfolio Managers' Ownership of Fund Shares** 

As of September 30, 2025, Mr. Gladchun had the following ownership of the Fund:

---

| | |
|:---|:---|
| **Name of Portfolio Manager** | **Fund(s) Managed** |
| Michael Gladchun | Loomis Sayles Core Plus Bond Fund E |

---

<sup>1</sup>A. None

B. $1 – $10,000

C. $10,001 – $50,000

D. $50,001 – $100,000

E. $100,001 – $500,000

F. $500,001 – $1,000,000

G. over $1,000,000