# EDGAR Filing Document

**Accession Number:** 0001070732
**File Stem:** 0001076598-25-000219
**Filing Date:** 2025-6
**Character Count:** 4766
**Document Hash:** 35186cb65a9bbcb2fbbdabee24dca3bb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001076598-25-000219.hdr.sgml**: 20250612

**ACCESSION NUMBER**: 0001076598-25-000219

**CONFORMED SUBMISSION TYPE**: 424B3

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250612

**DATE AS OF CHANGE**: 20250612

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Eaton Vance Senior Income Trust
- **CENTRAL INDEX KEY:** 0001070732

**ORGANIZATION NAME:**
- **EIN:** 043435040

**FILING VALUES:**
- **FORM TYPE:** 424B3
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-263033
- **FILM NUMBER:** 251043115

**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 SENIOR INCOME TRUST
- **DATE OF NAME CHANGE:** 19980919

&nbsp;&nbsp;&nbsp; **Filed pursuant to Rule 424(b)(3)**<br> **File No. 333-263033**<br>

**EATON VANCE SENIOR INCOME TRUST**

**Supplement to Prospectus and Statement of Additional Information dated August 25, 2022**

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

1. **The following replaces the fifth paragraph under "The Adviser" in "Management of the Trust" in the Trust's Prospectus**:

Peter Campo, Catherine C. McDermott and Daniel P. McElaney are the portfolio managers of the Trust. Mr. Campo and Ms. McDermott are Managing Directors of Morgan Stanley and Vice Presidents of Eaton Vance. Mr. McElaney is an Executive Director of Morgan Stanley and a Vice President of Eaton Vance. Ms. McDermott and Mr. McElaney have managed the Trust since March 2019, and Mr. Campo has managed the Trust since June 12, 2025. Ms. McDermott and Mr. McElaney have been employees of the Morgan Stanley organization for more than five years and manage other Eaton Vance funds. Mr. Campo has been an employee of the Morgan Stanley organization since April 2025 and manages other Eaton Vance funds. Prior to joining Morgan Stanley, Mr. Campo worked at Goldman Sachs as Global Co-Head of High Yield & Bank Loan Credit since March 2018. Prior to joining Goldman Sachs, Mr. Campo served for more than 15 years as a Portfolio Manager and senior credit analyst on the Floating-Rate Loan team at Eaton Vance.

**2. The following replaces the tables under "Portfolio Managers." in "Investment Advisory and Other Services" in the Trust's SAI:**

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | &nbsp;&nbsp;Number of<br> All Accounts | &nbsp;&nbsp;Total Assets of<br> All Accounts | &nbsp;&nbsp;Number of Accounts<br> Paying a Performance Fee | &nbsp;&nbsp;Total Assets of Accounts<br> Paying a Performance Fee |
| &nbsp;&nbsp;&nbsp;&nbsp;Peter Campo<sup>(1)</sup> |  |  |  |  |
| Registered Investment Companies<sup>(2)</sup> | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |
| Other Pooled Investment Vehicles | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |
| Other Accounts | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |
| &nbsp;&nbsp;&nbsp;&nbsp;Catherine C. McDermott |  |  |  |  |
| Registered Investment Companies<sup>(2)</sup> | &nbsp;&nbsp;7 | &nbsp;&nbsp;$4327.4 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |
| Other Pooled Investment Vehicles | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |
| Other Accounts | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |
| &nbsp;&nbsp;&nbsp;&nbsp;Daniel P. McElaney |  |  |  |  |
| Registered Investment Companies<sup>(2)</sup> | &nbsp;&nbsp;4 | &nbsp;&nbsp;$1652.3 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |
| Other Pooled Investment Vehicles | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |
| Other Accounts | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;$0 |

---

<sup>(1)</sup> As of April 30, 2025.

<sup>(2)</sup> This portfolio manager serves as portfolio manager of one or more registered investment companies that invests or may invest in one or more underlying registered investment companies in the Eaton Vance family of funds or other pooled investment vehicles sponsored by Eaton Vance. The underlying investment companies may be managed by this portfolio manager or another portfolio manager.

---

| | | |
|:---|:---|:---|
| Portfolio Managers | &nbsp;&nbsp;Dollar Range of Equity Securities<br> Beneficially Owned in the Trust | &nbsp;&nbsp;Aggregate Dollar Range of Equity<br> Securities Beneficially Owned in<br> the Eaton Vance Family of Funds |
| Peter Campo<sup>(1)</sup> |  |  |
| Catherine C. McDermott |  | &nbsp;&nbsp;Over $1,000,000 |
| Daniel P. McElaney |  | &nbsp;&nbsp;$100001 - $500000 |

---

<sup>(1)</sup> As of April 30, 2025.

**June 12, 2025**