FIRST BUSINESS FINANCIAL SERVICES, INC. 10-Q

Item 5. Other Information None. Item 6. Exhibits 31.1 Certification of the Chief Executive Officer 31.2 Certification of the Chief Financial Officer 32 Certification of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 101 The following financial information from First Business Financial Services, Inc.’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2020, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Balance Sheets as of September 30, 2020 and December 31, 2019, (ii) Consolidated Statements of Income for the three and nine months ended September 30, 2020 and 2019, (iii) Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2020 and 2019, (iv) Consolidated Statements of Changes in Stockholders’ Equity for the three and nine months ended September 30, 2020 and 2019, (v) Consolidated Statements of Cash Flows for the three and nine months ended September 30, 2020 and 2019, and (vi) the Notes to Unaudited Consolidated Financial Statements 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, thereunto duly authorized. FIRST BUSINESS FINANCIAL SERVICES, INC. October 23, 2020 /s/ Corey A. Chambas Corey A. Chambas Chief Executive Officer October 23, 2020 /s/ Edward G. Sloane, Jr. Edward G. Sloane, Jr. Chief Financial Officer (principal financial officer) 66