<SEC-DOCUMENT>0001076598-25-000219.txt : 20250612
<SEC-HEADER>0001076598-25-000219.hdr.sgml : 20250612
<ACCEPTANCE-DATETIME>20250612162713
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
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>evfsupp.htm
<DESCRIPTION>EATON VANCE SENIOR INCOME TRUST (EVF) SUPPLEMENT DTD 6-12-2025
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<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse">
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    <TD STYLE="width: 65%; padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt Arial, Helvetica, Sans-Serif; text-align: right">&nbsp;</TD>
    <TD STYLE="width: 35%; padding-right: 5.4pt; padding-left: 5.4pt">
    <P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0"><B>Filed pursuant to Rule 424(b)(3)</B></P>
    <P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0 0 0 7.9pt"><B>File No. 333-263033</B></P></TD></TR>
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<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>EATON VANCE SENIOR INCOME TRUST</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>Supplement to Prospectus and Statement of Additional
Information dated August 25, 2022</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>as may be supplemented and/or revised from time
to time</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 6pt 0"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-weight: normal">1.
</FONT><B>The following replaces the fifth paragraph under &ldquo;The Adviser&rdquo; in &ldquo;Management of the Trust&rdquo; in the Trust&rsquo;s
Prospectus</B><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-weight: normal">:</FONT></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 6pt 0">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 &amp; 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.</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 6pt 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 6pt 0"><B>2. The following replaces the tables under &ldquo;Portfolio Managers.&rdquo;
in &ldquo;Investment Advisory and Other Services&rdquo; in the Trust&rsquo;s SAI:</B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="width: 80%; font: 9pt Arial Narrow, Helvetica, Sans-Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 33%; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="width: 11%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Number of<BR>
All Accounts</TD>
    <TD STYLE="width: 13%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Total Assets of<BR>
All Accounts</TD>
    <TD STYLE="width: 22%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Number of Accounts<BR>
Paying a Performance Fee</TD>
    <TD STYLE="width: 21%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Total Assets of Accounts<BR>
Paying a Performance Fee</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 13.7pt; line-height: 10pt">Peter Campo<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif"><SUP>(1)</SUP></FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Registered Investment Companies<SUP>(2)</SUP></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Pooled Investment Vehicles</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Accounts</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 13.7pt; line-height: 10pt">Catherine C. McDermott</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Registered Investment Companies<SUP>(2)</SUP></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">7</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$4,327.4</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Pooled Investment Vehicles</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Accounts</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 13.7pt; line-height: 10pt">Daniel P. McElaney</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Registered Investment Companies<SUP>(2)</SUP></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">4</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$1,652.3</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Pooled Investment Vehicles</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Other Accounts</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">0</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$0</TD></TR>
  </TABLE>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 9pt/10pt Arial Narrow, Helvetica, Sans-Serif; margin-top: 3pt; margin-bottom: 3pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif"><SUP>(1)</SUP></FONT></TD><TD>As of April 30, 2025.</TD></TR></TABLE>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 9pt/10pt Arial Narrow, Helvetica, Sans-Serif; margin-top: 3pt; margin-bottom: 3pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif"><SUP>(2)</SUP></FONT></TD><TD>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.</TD></TR></TABLE>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="font: 9pt Arial Narrow, Helvetica, Sans-Serif; width: 70%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 26%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Portfolio Managers</TD>
    <TD STYLE="width: 34%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Dollar Range of Equity Securities<BR>
Beneficially Owned in the Trust</TD>
    <TD STYLE="width: 40%; border-bottom: Black 1pt solid; padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Aggregate Dollar Range of Equity<BR>
Securities Beneficially Owned in<BR>
the Eaton Vance Family of Funds</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Peter Campo<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif"><SUP>(1)</SUP></FONT></TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">None</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">None</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Catherine C. McDermott</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">None</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">Over $1,000,000</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 3pt 5.4pt 3pt 2.9pt; line-height: 10pt">Daniel P. McElaney</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">None</TD>
    <TD STYLE="padding: 3pt 5.4pt; text-align: center; line-height: 10pt">$100,001 - $500,000</TD></TR>
  </TABLE>
<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 9pt/10pt Arial Narrow, Helvetica, Sans-Serif; margin-top: 3pt; margin-bottom: 3pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif"><SUP>(1)</SUP></FONT></TD><TD>As of April 30, 2025.</TD></TR></TABLE>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 9pt Arial Narrow, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 51%; padding-right: 0.25in; font: 10pt Arial, Helvetica, Sans-Serif"><B>June 12, 2025</B></TD>
    <TD STYLE="vertical-align: top; width: 49%; padding-top: 3pt; padding-right: 1.9pt; padding-bottom: 3pt; text-align: right; font: 10pt Arial, Helvetica, Sans-Serif">&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0.25in 0 0">&nbsp;</P>


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