# EDGAR Filing Document

**Accession Number:** 0000917469
**File Stem:** 0001193125-26-201168
**Filing Date:** 2026-5
**Character Count:** 8263
**Document Hash:** 3a3dc1cedb81e5f80fd0e4d8c2de30b3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-201168.hdr.sgml**: 20260501

**ACCESSION NUMBER**: 0001193125-26-201168

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260501

**DATE AS OF CHANGE**: 20260501

**EFFECTIVENESS DATE**: 20260501

**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:** 26931816

**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 Securitized Asset Fund (Series ID: S000006639)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSSAX         | C000018125 |

---

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

---

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

---

### Loomis Sayles Global Bond Fund (Series ID: S000006641)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSGBX         | C000018127 |
| Retail Class        | LSGLX         | C000018128 |
| Class N             | LSGNX         | C000125494 |

---

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

---

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

---

### Loomis Sayles Inflation Protected Securities Fund (Series ID: S000006643)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSGSX         | C000018130 |
| Retail Class        | LIPRX         | C000089752 |
| Class N             | LIPNX         | C000182246 |

---

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

---

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

---

### Loomis Sayles Small Cap Value Fund (Series ID: S000006647)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | LSSCX         | C000018134 |
| Retail Class        | LSCRX         | C000018135 |
| Admin Class         | LSVAX         | C000018136 |
| Class N             | LSCNX         | C000125495 |

---

## Series and Classes Contracts Data

### Loomis Sayles Securitized Asset Fund (Series ID: S000006639)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018125 | Institutional Class | LSSAX           |

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

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

### Loomis Sayles Global Bond Fund (Series ID: S000006641)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018127 | Institutional Class | LSGBX           |
| C000018128 | Retail Class        | LSGLX           |
| C000125494 | Class N             | LSGNX           |

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

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

### Loomis Sayles Inflation Protected Securities Fund (Series ID: S000006643)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018130 | Institutional Class | LSGSX           |
| C000089752 | Retail Class        | LIPRX           |
| C000182246 | Class N             | LIPNX           |

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

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

### Loomis Sayles Small Cap Value Fund (Series ID: S000006647)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000018134 | Institutional Class | LSSCX           |
| C000018135 | Retail Class        | LSCRX           |
| C000018136 | Admin Class         | LSVAX           |
| C000125495 | Class N             | LSCNX           |

*Supplement dated May 1, 2026, for the Loomis Sayles Funds Summary Prospectuses,* 

*Prospectuses and Statements of Additional Information ("SAIs"), each dated February 1, 2026,* 

*as may be revised or supplemented from time to time, for the following funds:* 

**Loomis Sayles Fixed Income Fund** 

**Loomis Sayles Global Bond Fund** 

**Loomis Sayles High Income Opportunities Fund** 

**Loomis Sayles Inflation Protected Securities Fund** 

**Loomis Sayles Institutional High Income Fund** 

**Loomis Sayles Small Cap Growth Fund** 

**Loomis Sayles Small Cap Value Fund** 

**Loomis Sayles Small/Mid Cap Growth Fund** 

**Loomis Sayles Securitized Asset Fund** 

**(together, the "Funds")** 

***Effective after the close of business on June 5, 2026, all references to the Funds' address, telephone number and website address within each Fund's Summary Prospectus, Prospectus and SAI are hereby amended and restated as follows:***

***Telephone number:*** *800-225-5478* 

***Email address:*** *NatixisFunds@natixis.com* 

***General Website address:*** *www.im.natixis.com* 

***Fund Documents Website address:*** *www.im.natixis.com/funddocuments* 

---

| | |
|:---|:---|
| **Regular Mail** | **Overnight Mail** |
| Loomis Sayles Funds<br> P.O. Box 219579<br> Kansas City, MO 64121-9579 | Loomis Sayles Funds<br> 801 Pennsylvania Ave<br> Suite 219579<br> Kansas City, MO 64105-1307 |

---

***Effective after the close of business on June 5, 2026, the second paragraph under the sub-section "Portfolio Holdings" in the section "More Information About Investment Strategies" within each Fund's Prospectus is hereby amended and restated as follows:***

A "snapshot" of each Fund's investments may be found in each Fund's filing on Form N-CSR. In addition, a list of each Fund's full portfolio holdings, which is updated monthly after an aging period of at least 30 calendar days (60 calendar days for Loomis Sayles Small Cap Value Fund), is available on each Fund's website at www.loomissayles.com (click on "Resources", then "Holdings", then select the relevant Fund's "Monthly Holdings"). These holdings will remain accessible on the website at least until each Fund files its respective Form N-CSR or Form N-PORT with the SEC for the period that includes the date of the information. In addition, a list of each Fund's top 10 holdings as of the month-end is generally available within 7 business days after the month-end on the Fund's website at www.loomissayles.com (click on "Resources", then "Holdings" then select the relevant Fund's "Top 10 Holdings"). Effective after the close of business on June 5, 2026, this information is available on each Fund's website at im.natixis.com/us/funddocuments (in the "Holdings" column select "Full portfolio holdings" for the relevant Fund). These holdings will remain accessible on the website at least until each Fund files its respective Form N-CSR or Form N-PORT with the SEC for the period that includes the date of the information. In addition, a list of each Funds' top 10 holdings as of the month end is generally available within 7 business days after the month end on the Funds' website at im.natixis.com/us/fund-documents (click Fund name and navigate to "Top Ten Holdings" section on the web page).