Company: EVF
Filing Date: 2025-09-23
Form Type: DEFA14A
Source: 0001133228-25-010015
Chunk: 1

Company: Eaton Vance Senior Income Trust
Filing Date: 2025-09-23
Form: DEFA14A
Chunk 1
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 correct Annual Meeting date, and this        
 Supplement updates the form of proxy cards included in the EDGAR version of the Proxy Statement. 
 There are no changes to the proxy card or voting instruction form previously mailed to           
 shareholders.                                                                                    |

For more information, please contact the Fund at 1-800-262-1122.
This Supplement should be read in conjunction with the Proxy Statement, and other than the revisions described above, this Supplement
does not modify any information in the Proxy Statement. From and after the date of this Supplement, any references to the “Proxy
Statement” are to the Proxy Statement as supplemented hereby.

| September 23, 2025 | 48648-00 9.23.25 |