<SEC-DOCUMENT>0001193125-17-186433-index.html : 20170530
<SEC-HEADER>0001193125-17-186433.hdr.sgml : 20170530
<ACCEPTANCE-DATETIME>20170530103501
ACCESSION NUMBER:		0001193125-17-186433
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20170530
DATE AS OF CHANGE:		20170530

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:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-202791
		FILM NUMBER:		17875925

	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>424B5
<SEQUENCE>1
<FILENAME>d399279d424b5.htm
<DESCRIPTION>424B5
<TEXT>
Document 1 - file: d399279d424b5.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g399279g50u27.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g399279g50u27.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g399279g69d47.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g399279g69d47.jpg

</DOCUMENT>
</SEC-DOCUMENT>