<SEC-DOCUMENT>0001193125-21-140475-index.html : 20210429
<SEC-HEADER>0001193125-21-140475.hdr.sgml : 20210429
<ACCEPTANCE-DATETIME>20210429161755
ACCESSION NUMBER:		0001193125-21-140475
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20210429
DATE AS OF CHANGE:		20210429

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FINANCIAL INSTITUTIONS INC
		CENTRAL INDEX KEY:			0000862831
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				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:		21870873

	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>d79395ddefa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: d79395ddefa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g79395g40b40.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g79395g40b40.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g79395g50b50.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g79395g50b50.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g79395g60b60.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g79395g60b60.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g79395g70a70.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g79395g70a70.jpg

</DOCUMENT>
</SEC-DOCUMENT>