<SEC-DOCUMENT>0001564590-20-026557-index.html : 20200521
<SEC-HEADER>0001564590-20-026557.hdr.sgml : 20200521
<ACCEPTANCE-DATETIME>20200521161702
ACCESSION NUMBER:		0001564590-20-026557
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20200521
DATE AS OF CHANGE:		20200521
EFFECTIVENESS DATE:		20200521

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:		20902071

	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-defa14a_20200521.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: fisi-defa14a_20200521.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g135wdjua5iv000001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g135wdjua5iv000001.jpg

</DOCUMENT>
</SEC-DOCUMENT>