Item 5.02. Departure of Directors or Certain Officers, Election of Directors, Appointment of Certain Officers, Compensatory Arrangements of Certain Officers.

Effective January 3, 2023, certain executive officers of First Business Financial Services, Inc. (the "Company") were appointed to new positions, as follows:

?David R. Seiler, Chief Operating Officer of the Company since April 2016, was named President and Chief Operating Officer of the Company; and

?Mark J. Meloy, who joined the Company in 2000 and most recently served as Chief Executive Officer of First Business Bank, has been promoted to Executive Vice President of the Company; and

?James E. Hartlieb has been named President and Chief Executive Officer of First Business Bank and appointed as a Director of the First Business Bank Board of Directors. Mr. Hartlieb joined First Business Bank in 2009 as Senior Vice President and has served as President since 2015.

Corey A. Chambas, previously the President and Chief Executive Officer of the Company, will continue as its Chief Executive Officer.

Item 8.01. Other Events. On January 6, 2023, the Company issued a press release announcing the events described in Item 5.02 of this Current Report on Form 8-K. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.



(d) Exhibits.

           99.1             Press Release dated January 6, 2023
            104           Cover Page Interactive Data File (embedded within the Inline XBRL
                          Document)

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