FORM 8-K

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

February 2, 2026

FIRST BUSINESS FINANCIAL SERVICES, INC.

February 3, 2026

FIRST BUSINESS FINANCIAL SERVICES, INC.

/s/ Brian D. Spielmann

Brian D. Spielmann

Chief Financial Officer

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): ~~January~~February 2903, 2026

First Business Financial Services, Inc.

(Exact name of Registrant as Specified in Its Charter)


Wisconsin	001-34095	39-1576570
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

401 Charmany Drive
Madison, Wisconsin		53719
(Address of Principal Executive Offices)		(Zip Code)

     Registrant’s Telephone Number, Including Area Code: 608 238-8008

    

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.01 par value	FBIZ	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 57.0201. ~~Departure~~ Regulation ofFD ~~Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers~~Disclosure.

On ~~January~~February 293, 2026, ~~Ralph R. Kauten provided~~ First Business Financial Services, Inc. (the "“Company"”) ~~with notice~~ ofposted ~~his~~an ~~intention~~investor presentation to ~~retire~~its ~~from~~website ~~the~~www.firstbusiness.bank ~~Company’s~~under ~~Board of Directors (~~the “~~Board~~Investor Relations”) ~~effective~~tab. asThe ofinformation ~~the~~included ~~conclusion~~in of the ~~2026~~presentation ~~Annual~~provides ~~Meeting~~an overview of ~~Shareholders,~~the ~~which~~Company’s isrecent ~~expected~~operating toperformance, befinancial ~~held~~condition, onand orbusiness ~~about~~strategy. ~~April~~The ~~24,~~Company ~~2026.~~intends ~~Mr.~~to ~~Kauten~~use ~~has~~this ~~served~~presentation onfrom ~~the~~time ~~Board~~to ~~since~~time ~~2018.~~when ~~Mr.~~the ~~Kauten’~~Company's ~~retirement~~executives isinteract ~~in accordance~~ with ~~reaching~~shareholders, ~~the~~analysts ~~age of 75 as outlined in the Director Retirement Policy~~ and ~~did~~other ~~not~~third ~~involve~~parties. ~~any~~A ~~disagreement~~copy ~~with~~of the ~~Company on any matter relating to the~~ registrant’s ~~operations,~~presentation ~~policies,~~is orattached ~~practices.~~hereto ~~Jason~~as R.Exhibit ~~Graham will succeed Mr~~99.1 ~~Kauten~~to asthis ~~the~~Current ~~Chair~~Report ofon ~~the~~Form ~~Audit~~8-K ~~Committee~~and ~~upon~~is ~~the~~incorporated ~~effective~~herein ~~date~~by ~~of Mr~~reference. ~~Kauten’s retirement.~~

Item 9.01	Financial Statements and Exhibits.
(a)	Not applicable
(b)	Not applicable
(c)	Not applicable
(d)	Exhibits. The following exhibits are being furnished herewith:
	104 Cover Page Interactive Data File (embedded within the Inline XBRL Document)

The information in this Current Report on Form 8-K and Exhibit 99.1 attached hereto are being “furnished” pursuant to Item 7.01 of Form 8-K, and will not, except to the extent required by applicable law or regulation, be deemed “filed” by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor will any of such information or exhibits be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, except as expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

(a) Not applicable

(b) Not applicable

(d) Exhibits. The following exhibit is being furnished herewith:


99.1		Slides from Investor Presentation.
104		Cover Page Interactive Data File (embedded within the Inline XBRL Document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Filing Compare · FIRST BUSINESS FINANCIAL SERVICES, INC.