Company: EFR
Filing Date: 2025-12-12
Form Type: 424B3
Source: 0001133228-25-013418
Chunk: 0

Company: Eaton Vance Senior Floating-Rate Trust
Filing Date: 2025-12-12
Form: 424B3
Chunk 0
---
| Filed pursuant to Rule 424(b)(3) |
| File No. 333-266343              |

<div align='center'>EATON VANCE SENIOR FLOATING-RATE TRUST

(the “Trust”)

Supplement to Prospectus and Statement of Additional Information (“SAI”) dated March 31, 2023

as may be supplemented and/or revised from time to time</div>

Effective December 31, 2025, Peter Campo and Daniel
P. McElaney will continue to serve as portfolio managers of the Trust. All references to other portfolio managers of the Trust are removed
from the Trust’s Prospectus and Statement of Additional Information.