<SEC-DOCUMENT>0000950170-25-053505-index.html : 20250414
<SEC-HEADER>0000950170-25-053505.hdr.sgml : 20250414
<ACCEPTANCE-DATETIME>20250414080106
ACCESSION NUMBER:		0000950170-25-053505
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20250414
DATE AS OF CHANGE:		20250414

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FINANCIAL INSTITUTIONS INC
		CENTRAL INDEX KEY:			0000862831
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		ORGANIZATION NAME:           	02 Finance
		EIN:				160816610
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-26481
		FILM NUMBER:		25834243

	BUSINESS ADDRESS:	
		STREET 1:		220 LIBERTY STREET
		CITY:			WARSAW
		STATE:			NY
		ZIP:			14569
		BUSINESS PHONE:		5857861100

	MAIL ADDRESS:	
		STREET 1:		220 LIBERTY STREET
		CITY:			WARSAW
		STATE:			NY
		ZIP:			14569
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>fisi_2025_notice_and_acc.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: fisi_2025_notice_and_acc.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>img255940554_0.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: img255940554_0.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>img255940554_1.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: img255940554_1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>img255940554_2.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: img255940554_2.jpg

</DOCUMENT>
</SEC-DOCUMENT>