BYERS SANDRA L 4

What Happened

• Sandra L. Byers, Principal Accounting Officer of Financial Institutions, Inc. (FISI), had 690 restricted stock units (RSUs) convert into 690 shares on March 20, 2026 (transaction code M — exercise/conversion of a derivative). The filing shows a corresponding disposition of 690 shares at $0.00 (reported as a derivative disposition), so no cash proceeds are recorded on the Form 4.

Key Details

• Transaction date: 2026-03-20; Form 4 filed: 2026-03-23 (Accession: 0001193125-26-119708).
• Converted/acquired: 690 shares via RSU conversion (exercise/conversion, code M).
• Disposed: 690 shares at $0.00 (reported as derivative disposition); total cash proceeds shown = $0.
• Shares owned after transaction: Not reported in the provided data.
• Footnotes: F1 — each restricted stock unit represents a contingent right to receive one share of FISI common stock. F2 — RSUs convert into shares on a one-for-one basis.

Context

• This was not a purchase of stock; it reflects compensation vesting/conversion of RSUs into shares. The reported disposal at $0.00 commonly reflects shares withheld or retired to cover taxes or other obligations related to vesting rather than a market sale for cash. No cash sale proceeds or open-market sale are shown on the filing.