# EDGAR Filing Document

**Accession Number:** 0000917469
**File Stem:** 0001193125-26-247799
**Filing Date:** 2026-5
**Character Count:** 13714
**Document Hash:** 62d7a324a8ff6cdc2a4a5a2c8c991ee6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-247799.hdr.sgml**: 20260529

**ACCESSION NUMBER**: 0001193125-26-247799

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260529

**DATE AS OF CHANGE**: 20260529

**EFFECTIVENESS DATE**: 20260529

**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:** 261042802

**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 29, 2026 to the Funds' Statement of Additional Information ("SAI"), 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 Darci and Bryan 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 sub-sections "Portfolio Managers' Management of Other Accounts" and "Portfolio Managers' Ownership of Fund Shares" within the section "Portfolio Management Information" of the SAI is amended to include the following:***

**Portfolio Managers' Management of Other Accounts** 

The following table provides information on the other accounts managed by Mr. Darci and Mr. Hazelton as of March 31, 2026:

---

| | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Registered Investment<br>Companies** | **Registered Investment<br>Companies** | **Registered Investment<br>Companies** | **Registered Investment<br>Companies** | **Other Pooled Investment Vehicles** | **Other Pooled Investment Vehicles** | **Other Pooled Investment Vehicles** | **Other Pooled Investment 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**<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**<br>**Accounts**<br>**Managed** | **Other**<br>**Accounts**<br>**Managed** | **Advisory Fee<br>is Based**<br>**on<br>Performance** | **Advisory Fee<br>is Based**<br>**on<br>Performance** |
| **Name of**<br> **Portfolio**<br> **Manager** | **# of<br>Accts** | **Total<br>Assets** | **# of<br>Accts** | **Total<br>Assets** | **# of<br>Accts** | **Total Assets** | **# of<br>Accts** | **Total<br>Assets** | **# of<br>Accts** | **Total Assets** | **# of<br>Accts** | **Total<br>Assets** |
|  Scott A. Darci | 0 | $0 | 0 | $0 | 4 | $475 million | 0 | $0 | 0 | $0 | 0 | $0 |
|  Bryan C. Hazelton | 0 | $0 | 0 | $0 | 0 | $0 | 0 | $0 | 16 | $3.7 billion | 0 | $0 |

---

**Portfolio Managers' Ownership of Fund Shares** 

As of March 31, 2026, Mr. Darci and Mr. Hazelton had the following ownership of the Funds:

---

| | |
|:---|:---|
| **Name of Portfolio Manager** | **Fund(s) Managed** |
| Scott A. Darci | Loomis Sayles Income Fund<br> Loomis Sayles Investment Grade Fixed Income Fund<br> E<br> A |

---

------

Bryan C. Hazelton Loomis Sayles Fixed Income Fund Loomis Sayles Investment Grade Fixed Income Fund A A

<sup>\*</sup> A. None

B. $1 – 10,000 <br>

C. $10,001 – $50,000 <br>

D. $50,001 – $100,000 <br>

E. $100,001 – $500,000 <br>

F. $500,001 – $1,000,000 <br>

G. over $1,000,000 <br>

------

*Supplement dated May 29, 2026 to the Funds' Statement of Additional Information ("SAI"), 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 Darci and Bryan 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 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 sub-sections "Portfolio Managers' Management of Other Accounts" and "Portfolio Managers' Ownership of Fund Shares" within the section "Portfolio Management Information" of the SAI is amended to include the following:***

**Portfolio Managers' Management of Other Accounts** 

The following table provides information on the other accounts managed by Mr. Darci, Mr. Hazelton, and Mr. Romanelli as of March 31, 2026:

---

| | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **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**<br>**Fee is**<br>**Based on<br>Performance** | **Advisory**<br>**Fee is**<br>**Based on<br>Performance** | **Other**<br>**Accounts**<br>**Managed** | **Other**<br>**Accounts**<br>**Managed** | **Advisory fee is<br>Based on<br>Performance** | **Advisory fee is<br>Based on<br>Performance** | **Other Accounts<br>Managed** | **Other Accounts<br>Managed** | **Advisory Fee is<br>Based on<br>Performance** | **Advisory Fee is<br>Based on<br>Performance** |
| **Name of**<br> **Portfolio**<br> **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** |
|  Scott A. Darci | 0 | $0 | 0 | $0 | 4 | $475 million | 0 | $0 | 0 | $0 | 0 | $0 |
|  Bryan C. Hazelton | 0 | $0 | 0 | $0 | 0 | $0 | 0 | $0 | 16 | $3.7 billion | 0 | $0 |
|  Christopher J. Romanelli | 1 | $66.3 million | 0 | $0 | 1 | $72.2 million | 0 | $0 | 4 | $829.8 million | 0 | $0 |

---

------

**Portfolio Managers' Ownership of Fund Shares** 

As of March 31, 2026, Mr. Darci, Mr. Hazelton, and Mr. Romanelli had the following ownership of the Funds:

---

| | |
|:---|:---|
| **Name of Portfolio Manager** | **Fund(s) Managed** |
| Scott A. Darci | Loomis Sayles Fixed Income Fund A |
| Bryan C. Hazelton | Loomis Sayles Fixed Income Fund A |
| Christopher J. Romanelli | Loomis Sayles Institutional High Income Fund D |

---

<sup>\*</sup> A. None

B. $1 – 10,000 <br>

C. $10,001 – $50,000 <br>

D. $50,001 – $100,000 <br>

E. $100,001 – $500,000 <br>

F. $500,001 – $1,000,000 <br>

G. over $1,000,000 <br>

------

*Supplement dated May 29, 2026 to the Fund's Statement of Additional Information ("SAI"), 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 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 sub-sections "Portfolio Managers' Management of Other Accounts" and "Portfolio Managers' Ownership of Fund Shares" within the section "Portfolio Management Information" of the SAI is amended to include the following:***

**Portfolio Managers' Management of Other Accounts** 

The following table provides information on the other accounts managed by Mr. Romanelli as of March 31, 2026:

---

| | | | | | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **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**<br>**Accounts**<br>**Managed** | **Other**<br>**Accounts**<br>**Managed** | **Advisory fee is<br>Based on<br>Performance** | **Advisory fee is<br>Based on<br>Performance** | **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** |
| **Name of**<br> **Portfolio**<br> **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** |
|  Christopher J. Romanelli | 1 | $66.4 million | 0 | $0 | 1 | $72.2 million | 0 | $0 | 4 | $829.8 million | 0 | $0 |

---

**Portfolio Managers' Ownership of Fund Shares** 

As of March 31, 2026, Mr. Romanelli had the following ownership of the Fund:

---

| | |
|:---|:---|
| **Name of Portfolio Manager** | **Fund(s) Managed** |
| Christopher J. Romanelli | Loomis Sayles High Income Opportunities Fund A |

---

<sup>\*</sup> A. None

B. $1 – 10,000 <br>

C. $10,001 – $50,000 <br>

D. $50,001 – $100,000 <br>

E. $100,001 – $500,000 <br>

F. $500,001 – $1,000,000 <br>

G. over $1,000,000 <br>