    <SEC-DOCUMENT>0001521951-18-000033-index.html : 20180420
    <SEC-HEADER>0001521951-18-000033.hdr.sgml : 20180420
    <ACCEPTANCE-DATETIME>20180420083000
    ACCESSION NUMBER:		0001521951-18-000033
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		5
    FILED AS OF DATE:		20180420
    DATE AS OF CHANGE:		20180420
    EFFECTIVENESS DATE:		20180420

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			FIRST BUSINESS FINANCIAL SERVICES, INC.
    		CENTRAL INDEX KEY:			0001521951
    		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
    		IRS NUMBER:				391576570
    		STATE OF INCORPORATION:			WI
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-34095
    		FILM NUMBER:		18765114

    	BUSINESS ADDRESS:
    		STREET 1:		401 CHARMANY DRIVE
    		CITY:			MADISON
    		STATE:			WI
    		ZIP:			53719
    		BUSINESS PHONE:		608-238-8008

    	MAIL ADDRESS:
    		STREET 1:		401 CHARMANY DRIVE
    		STREET 2:		PO BOX 44961
    		CITY:			MADISON
    		STATE:			WI
    		ZIP:			53744

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	First Business Financial Services, Inc.
    		DATE OF NAME CHANGE:	20110527
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>defa14alettersandinvitatio.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: defa14alettersandinvitatio.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>invite_inside2018v2.jpg
    <TEXT>
    Document 2 - file: invite_inside2018v2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>invite_outside2018.jpg
    <TEXT>
    Document 3 - file: invite_outside2018.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>proxycard02rztafirstbusiness.jpg
    <TEXT>
    Document 4 - file: proxycard02rztafirstbusiness.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>proxycardpage2.jpg
    <TEXT>
    Document 5 - file: proxycardpage2.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>