Company: EVF
Filing Date: 2025-05-01
Form Type: 424B3
Source: 0001076598-25-000099
Chunk: 1

Company: Eaton Vance Senior Income Trust
Filing Date: 2025-05-01
Form: 424B3
Chunk 1
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 of all other shares of that fund. Information on how the Fund voted proxies relating to portfolio securities
during the most recent 12-month period ended June 30 is available (1) without charge, upon request, by calling 1-800-262-1122, (2) on
the SEC’s website at http://www.sec.gov and (3) on the Fund’s website at https://www.eatonvance.com.

2. The following replaces “Potential Conflicts of Interest”:

As a diversified global financial services firm,
Morgan Stanley, the parent company of the adviser and sub-adviser (if applicable), engages in a broad spectrum of activities,
including financial advisory services, investment management activities, lending, commercial banking, sponsoring and managing
private investment funds, engaging in broker-dealer transactions and principal securities, commodities and foreign exchange
transactions, research publication and other activities. In the ordinary course of its business, Morgan Stanley is a full-service
investment banking and financial services firm and therefore engages in activities where Morgan Stanley’s interests or the
interests of its clients may conflict with the interests of a Fund. Morgan Stanley advises clients and sponsors, manages or advises
other investment funds and investment programs, accounts and businesses (collectively, together with any new or successor funds,
programs, accounts or businesses sponsored, managed, or advised by the Adviser or one of its investment adviser affiliates, the
“Affiliated Investment Accounts”) with a wide variety of investment objectives that in some instances may overlap or
conflict with a Fund’s investment objectives and present conflicts of interest. In addition, Morgan Stanley, the Adviser
and/or the Adviser’s investment adviser affiliates may also from time to time create new or successor Affiliated Investment
Accounts that may compete with a Fund and present similar conflicts of interest. The discussion below enumerates certain actual,
apparent and potential conflicts of interest. There is no assurance that conflicts of interest will be resolved in favor of Fund
shareholders and, in fact, they may not be. The conflicts herein do not purport to be a complete list or explanation of the
conflicts associated with the financial or other interests the Adviser or its affiliates may have now or in the future. Conflicts of
interest not described below may also exist. References to the Adviser in this section include a Fund’s affiliated sub-adviser
(if any) unless otherwise noted.

The discussions below with respect to actual, apparent
and potential conflicts of interest may be applicable to or arise