<SEC-DOCUMENT>0001193125-20-324611-index.html : 20201222
<SEC-HEADER>0001193125-20-324611.hdr.sgml : 20201222
<ACCEPTANCE-DATETIME>20201222164707
ACCESSION NUMBER:		0001193125-20-324611
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20201222
DATE AS OF CHANGE:		20201222

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:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-251030
		FILM NUMBER:		201408589

	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>424B3
<SEQUENCE>1
<FILENAME>d14939d424b3.htm
<DESCRIPTION>424B3
<TEXT>
Document 1 - file: d14939d424b3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g14939g50u27.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g14939g50u27.jpg

</DOCUMENT>
</SEC-DOCUMENT>