FINANCIAL INSTITUTIONS INC (FISI) officer converts 690 RSUs into 2,150-share holding

Rhea-AI Filing Summary

FINANCIAL INSTITUTIONS INC insider activity: Principal Accounting Officer Sandra L. Byers exercised 690 restricted stock units into 690 shares of common stock on March 20, 2026. The RSUs converted on a one-for-one basis with no cash exercise price.

After the transaction, Byers directly holds 2,150 shares of common stock. The filing shows an exercise and share acquisition only, with no reported share sales or tax-withholding dispositions, which is consistent with routine equity compensation vesting.

Insider Trade Summary

690 shares exercised/converted

Mixed 2 txns

Insider BYERS SANDRA L

Role Insider

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Unit	690	$0.00	--
Exercise	Common Stock	690	$0.00	--

Holdings After Transaction: Restricted Stock Unit — 0 shares (Direct); Common Stock — 2,150 shares (Direct)

Footnotes (1)

1. Each restricted stock unit represents a contingent right to receive one share of FISI common stock. Restricted stock units convert into shares of common stock on a one-for-one basis.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

BYERS SANDRA L

(Last) (First) (Middle)

220 LIBERTY STREET

(Street)

WARSAW NEW YORK 14569

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
FINANCIAL INSTITUTIONS INC [ FISI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Principal Accounting Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/20/2026		M		690	A	(1)	2,150	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Unit	(2)	03/20/2026		M			690	03/20/2026	03/20/2026	Common Stock	690	$0	0	D

Explanation of Responses:

1. Each restricted stock unit represents a contingent right to receive one share of FISI common stock.

2. Restricted stock units convert into shares of common stock on a one-for-one basis.

	SANDRA L. BYERS	03/23/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did FINANCIAL INSTITUTIONS INC (FISI) report for Sandra L. Byers?

FINANCIAL INSTITUTIONS INC reported that Principal Accounting Officer Sandra L. Byers exercised 690 restricted stock units into 690 shares of common stock. This reflects the conversion of previously granted equity awards rather than an open-market stock purchase or sale.

How many FINANCIAL INSTITUTIONS INC (FISI) shares does Sandra L. Byers hold after this Form 4?

After the reported transactions, Sandra L. Byers directly holds 2,150 shares of FINANCIAL INSTITUTIONS INC common stock. This total reflects her position following the conversion of 690 restricted stock units into an equivalent number of common shares.

Were any FINANCIAL INSTITUTIONS INC (FISI) shares sold in Sandra L. Byers’ latest Form 4?

No shares were reported sold. The Form 4 shows only the exercise and conversion of 690 restricted stock units into common stock, with no sale or tax-withholding disposition transactions disclosed in connection with this equity award event.

What is the conversion ratio for Sandra L. Byers’ FINANCIAL INSTITUTIONS INC (FISI) restricted stock units?

Each restricted stock unit converts into one share of FINANCIAL INSTITUTIONS INC common stock. In this filing, 690 restricted stock units converted on a one-for-one basis into 690 common shares, as described in the accompanying footnotes to the Form 4.

Did Sandra L. Byers pay an exercise price for the FINANCIAL INSTITUTIONS INC (FISI) restricted stock units?

The reported transaction price per share and exercise price for the restricted stock units are both shown as 0.0000. This indicates the units converted into common stock without a cash exercise price, consistent with typical restricted stock unit vesting terms.