<SEC-DOCUMENT>0001521951-17-000095-index.html : 20171107
<SEC-HEADER>0001521951-17-000095.hdr.sgml : 20171107
<ACCEPTANCE-DATETIME>20171107142745
ACCESSION NUMBER:		0001521951-17-000095
CONFORMED SUBMISSION TYPE:	S-3
PUBLIC DOCUMENT COUNT:		7
REFERENCES 429:			333-201056
FILED AS OF DATE:		20171107
DATE AS OF CHANGE:		20171107

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:		S-3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-221387
		FILM NUMBER:		171182897

	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>S-3
<SEQUENCE>1
<FILENAME>s-3regstmt2017.htm
<DESCRIPTION>FORM S-3
<TEXT>
Document 1 - file: s-3regstmt2017.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.3
<SEQUENCE>2
<FILENAME>ex43formofindenture.htm
<DESCRIPTION>EXHIBIT 4.3
<TEXT>
Document 2 - file: ex43formofindenture.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>ex51bmclegalopinion.htm
<DESCRIPTION>EXHIBIT 5.1
<TEXT>
Document 3 - file: ex51bmclegalopinion.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.2
<SEQUENCE>4
<FILENAME>ex52bfknlegalopinion.htm
<DESCRIPTION>EXHIBIT 5.2
<TEXT>
Document 4 - file: ex52bfknlegalopinion.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-12.1
<SEQUENCE>5
<FILENAME>exhibit121.htm
<DESCRIPTION>EXHIBIT 12.1
<TEXT>
Document 5 - file: exhibit121.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>6
<FILENAME>ex231consent.htm
<DESCRIPTION>EXHIBIT 23.1
<TEXT>
Document 6 - file: ex231consent.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>fblogoregstmt2017.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: fblogoregstmt2017.jpg

</DOCUMENT>
</SEC-DOCUMENT>