# EDGAR Filing Document

**Accession Number:** 0000745463
**File Stem:** 0001133228-26-003790
**Filing Date:** 2026-3
**Character Count:** 2976
**Document Hash:** abdb0cd02656feea14a19234624b99dd
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001133228-26-003790.hdr.sgml**: 20260319

**ACCESSION NUMBER**: 0001133228-26-003790

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260319

**DATE AS OF CHANGE**: 20260319

**EFFECTIVENESS DATE**: 20260319

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Eaton Vance Mutual Funds Trust
- **CENTRAL INDEX KEY:** 0000745463

**ORGANIZATION NAME:**
- **EIN:** 000000000

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-90946
- **FILM NUMBER:** 26774151

**BUSINESS ADDRESS:**
- **STREET 1:** ONE POST OFFICE SQUARE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109
- **BUSINESS PHONE:** 617-482-8260

**MAIL ADDRESS:**
- **STREET 1:** ONE POST OFFICE SQUARE
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02109

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** EATON VANCE MUTUAL FUNDS TRUST
- **DATE OF NAME CHANGE:** 19950711

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** EATON VANCE GOVERNMENT OBLIGATIONS TRUST
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### Eaton Vance High Income Opportunities Fund (Series ID: S000005289)

---

|  |  |  |
|:---|:---|:---|
| Class Name                                          | Ticker Symbol | Class ID   |
| Eaton Vance High Income Opportunities Fund Class A  | ETHIX         | C000014454 |
| Eaton Vance High Income Opportunities Fund Class C  | ECHIX         | C000014456 |
| Eaton Vance High Income Opportunities Fund Class I  | EIHIX         | C000081635 |
| Eaton Vance High Income Opportunities Fund Class R6 | ERHIX         | C000243418 |

---

## Series and Classes Contracts Data

### Eaton Vance High Income Opportunities Fund (Series ID: S000005289)

| Class ID   | Class Name                                          | Ticker Symbol   |
|:---|:---|:---|
| C000014454 | Eaton Vance High Income Opportunities Fund Class A  | ETHIX           |
| C000014456 | Eaton Vance High Income Opportunities Fund Class C  | ECHIX           |
| C000081635 | Eaton Vance High Income Opportunities Fund Class I  | EIHIX           |
| C000243418 | Eaton Vance High Income Opportunities Fund Class R6 | ERHIX           |

**EATON VANCE HIGH INCOME OPPORTUNITIES fUND**

**(the "Fund")**

**Supplement to Summary Prospectus, Statutory Prospectus<br> and Statement of Additional Information ("SAI") dated March 1, 2026**

**as may be supplemented and/or revised from time to time**

Effective December 31, 2026 (the "Effective Date"), Stephen C. Concannon, CFA intends to retire and will no longer serve as a portfolio manager of the Fund. Accordingly, on the Effective Date, all references to Mr. Concannon will be removed from the Fund's Summary Prospectus, Statutory Prospectus and SAI.

Justin H. Bourgette, CFA, Bo Hunt and Jeffrey D. Mueller will continue to serve as portfolio managers of the Fund.

---

| | |
|:---|:---|
| **March 19, 2026** | **48676-00 3.19.26** |

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