# EDGAR Filing Document

**Accession Number:** 0000917469
**File Stem:** 0001193125-26-238058
**Filing Date:** 2026-5
**Character Count:** 10878
**Document Hash:** 4f23a781d951242af276970f91bbb3e0
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-238058.hdr.sgml**: 20260526

**ACCESSION NUMBER**: 0001193125-26-238058

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260526

**DATE AS OF CHANGE**: 20260526

**EFFECTIVENESS DATE**: 20260526

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** LOOMIS SAYLES FUNDS I
- **CENTRAL INDEX KEY:** 0000917469

**ORGANIZATION NAME:**
- **EIN:** 043219179
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 0930

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-22931
- **FILM NUMBER:** 261016073

**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:** LOOMIS SAYLES FUNDS II
- **DATE OF NAME CHANGE:** 20031119

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LOOMIS SAYLES INVESTMENT TRUST
- **DATE OF NAME CHANGE:** 20031015

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LOOMIS SAYLES FUNDS I
- **DATE OF NAME CHANGE:** 20030718

## Series and Classes Contracts Data

### Loomis Sayles Income Fund (Series ID: S000006638)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSBDX         | C000018122 |
| Retail Class        | LSBRX         | C000018123 |
| Admin Class         | LBFAX         | C000018124 |
| Class N             | LSBNX         | C000125493 |

---

### Loomis Sayles Fixed Income Fund (Series ID: S000006640)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSFIX         | C000018126 |

---

### Loomis Sayles High Income Opportunities Fund (Series ID: S000006642)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSIOX         | C000018129 |

---

### Loomis Sayles Institutional High Income Fund (Series ID: S000006644)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSHIX         | C000018131 |

---

### Loomis Sayles Investment Grade Fixed Income Fund (Series ID: S000006646)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSIGX         | C000018133 |

---

## Series and Classes Contracts Data

### Loomis Sayles Income Fund (Series ID: S000006638)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018122 | Institutional Class | LSBDX           |
| C000018123 | Retail Class        | LSBRX           |
| C000018124 | Admin Class         | LBFAX           |
| C000125493 | Class N             | LSBNX           |

### Loomis Sayles Fixed Income Fund (Series ID: S000006640)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018126 | Institutional Class | LSFIX           |

### Loomis Sayles High Income Opportunities Fund (Series ID: S000006642)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018129 | Institutional Class | LSIOX           |

### Loomis Sayles Institutional High Income Fund (Series ID: S000006644)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018131 | Institutional Class | LSHIX           |

### Loomis Sayles Investment Grade Fixed Income Fund (Series ID: S000006646)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018133 | Institutional Class | LSIGX           |

*Supplement dated May 26, 2026 to the Funds' Summary Prospectuses and Prospectus, each dated May 1, 2026 as may be revised or supplemented from time to time.* 

**LOOMIS SAYLES INCOME FUND** 

**LOOMIS SAYLES INVESTMENT GRADE FIXED INCOME FUND** 

**(each, a "Fund," together, the "Funds")** 

***Effective June 30, 2026, Scott A. Darci and Bryan C. Hazelton will join the portfolio management team of the Loomis Sayles Income Fund and Loomis Sayles Investment Grade Fixed Income Fund.***

Matthew J. Eagan and Brian P. Kennedy will remain as portfolio managers of the Loomis Sayles Income Fund and Loomis Sayles Investment Grade Fixed Income Fund.

***Accordingly, effective June 30, 2026 the information under the subsection "Portfolio Managers" in the "Management" section in the Loomis Sayles Income Fund and Loomis Sayles Investment Grade Fixed Income Fund's Summary Prospectuses is revised to include the following:***

Bryan C. Hazelton, CFA<sup>®</sup>, Portfolio Manager of Loomis Sayles, has served as a Portfolio Manager of the Fund since 2026.

Scott A. Darci, CFA<sup>®</sup>, Portfolio Manager of Loomis Sayles, has served as a Portfolio Manager of the Fund since 2026.

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

**Scott A. Darci, CFA<sup>®</sup>** – Scott A. Darci has served as a Portfolio Manager of the Loomis Sayles Income Fund and Loomis Sayles Investment Grade Fixed Income Fund since 2026. Mr. Darci, Portfolio Manager of Loomis Sayles, began his investment career in 2006 and joined Loomis Sayles in 2008. He received a B.A. from Dartmouth College, and a Masters in Investment Management from Boston University. Mr. Darci has over 20 years of investment experience.

**Bryan C. Hazelton, CFA<sup>®</sup>** – Bryan C. Hazelton has served as a Portfolio Manager of the Loomis Sayles Income Fund and Loomis Sayles Investment Grade Fixed Income Fund since 2026. Mr. Hazelton, Portfolio Manager of Loomis Sayles, began his investment career in 2007 and joined Loomis Sayles in 2011. He received a B.A. from Bentley University, and an M.B.A. from the Wharton School at the University of Pennsylvania. Mr. Hazelton has over 19 years of investment experience.

------

*Supplement dated May 26, 2026 to the Funds' Summary Prospectuses and Prospectus, each dated February 1, 2026 as may be revised or supplemented from time to time.* 

**LOOMIS SAYLES FIXED INCOME FUND** 

**LOOMIS SAYLES INSTITUTIONAL HIGH INCOME FUND** 

**(each, a "Fund," together, the "Funds")** 

***Effective June 30, 2026, Scott A. Darci and Bryan C. Hazelton will join the portfolio management team of the Loomis Sayles Fixed Income Fund.***

Matthew J. Eagan and Brian P. Kennedy will remain as portfolio managers of the Loomis Sayles Fixed Income Fund.

***Effective June 30, 2026, Christopher J. Romanelli will join the portfolio management team of the Loomis Sayles Institutional High Income Fund.***

Matthew J. Eagan, Brian P. Kennedy, Peter S. Sheehan, and Eric Williams will remain as portfolio managers of the Loomis Sayles Institutional High Income Fund.

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

Bryan C. Hazelton, CFA<sup>®</sup>, Portfolio Manager on the Full Discretion Team at Loomis Sayles, has served as a Portfolio Manager of the Fund since 2026.

Scott A. Darci, CFA<sup>®</sup>, Portfolio Manager on the Full Discretion Team at Loomis Sayles, has served as a Portfolio Manager of the Fund since 2026.

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

Christopher J. Romanelli, CFA<sup>®</sup>, Portfolio Manager on the Full Discretion Team at Loomis Sayles, has served as a Portfolio Manager of the Fund since 2026.

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

**Scott A. Darci, CFA<sup>®</sup>** – Scott A. Darci has served as a Portfolio Manager of the Loomis Sayles Fixed Income Fund since 2026. Mr. Darci, Portfolio Manager of Loomis Sayles, began his investment career in 2006 and joined Loomis Sayles in 2008. He received a B.A. from Dartmouth College, and a Masters in Investment Management from Boston University. Mr. Darci has over 20 years of investment experience.

**Bryan C. Hazelton, CFA<sup>®</sup>** – Bryan C. Hazelton has served as a Portfolio Manager of the Loomis Sayles Fixed Income Fund since 2026. Mr. Hazelton, Portfolio Manager of Loomis Sayles, began his investment career in 2007 and joined Loomis Sayles in 2011. He received a B.A. from Bentley University, and an M.B.A. from the Wharton School at the University of Pennsylvania. Mr. Hazelton has over 19 years of investment experience.

------

**Christopher J. Romanelli**, CFA<sup>®</sup>**** – Christopher J. Romanelli has served as a Portfolio Manager of the Loomis Sayles Institutional High Income Fund since 2026. Mr. Romanelli, Portfolio Manager of Loomis Sayles, began his investment career in 2005 and joined Loomis Sayles in 2010. He received a B.S. from Gordon College, and an M.S. from Boston University. Mr. Romanelli has over 21 years of investment experience.

------

*Supplement dated May 26, 2026 to the Fund's Summary Prospectus and Prospectus, each dated February 1, 2026 as may be revised or supplemented from time to time.* 

**LOOMIS SAYLES HIGH INCOME OPPORTUNITIES FUND** 

**(the "Fund")** 

***Effective June 30, 2026, Christopher J. Romanelli will join the portfolio management team of the Loomis Sayles High Income Opportunities Fund.***

Matthew J. Eagan, Brian P. Kennedy, Peter S. Sheehan, and Eric Williams will remain as portfolio managers of the Loomis Sayles High Income Opportunities Fund.

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

Christopher J. Romanelli, CFA<sup>®</sup>, Portfolio Manager on the Full Discretion Team at Loomis Sayles, has served as a 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:***

**Christopher J. Romanelli, CFA<sup>®</sup>** – Christopher J. Romanelli has served as a Portfolio Manager of the Loomis Sayles High Income Opportunities Fund since 2026. Mr. Romanelli, Portfolio Manager of Loomis Sayles, began his investment career in 2005 and joined Loomis Sayles in 2010. He received a B.S. from Gordon College, and an M.S. from Boston University. Mr. Romanelli has over 21 years of investment experience.