Results of Operations and Financial Condition. On July 30, 2026, First Business Financial Services, Inc. (the “Company”) announced its earnings for the quarter ended June 30, 2026, as well as the declaration of a quarterly cash dividend on its common stock and 7% series A preferred stock. A copy of the Company’s press release containing this information is being “furnished” as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Director — Scott M. Ferris: Mr. Scott M. Ferris was appointed as a Class III Director and joined the Audit Committee and Operational Risk Committee.

President and Chief Executive Officer — David R. Seiler: David R. Seiler was promoted to President and CEO, succeeding Corey A. Chambas.

Results of Operations and Financial Condition. On April 23, 2026, First Business Financial Services, Inc. (the “Company”) announced its earnings for the quarter ended March 31, 2026, as well as the declaration of a quarterly cash dividend on its common stock and 7% series A preferred stock. A copy of the Company’s press release containing this information is being “furnished” as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

President and Chief Executive Officer — David R. Seiler: David R. Seiler was promoted to President and Chief Executive Officer, succeeding Corey A. Chambas.

The filing details the vesting of Performance Restricted Stock Units for executive officers based on company performance goals.

Director — Ralph R. Kauten: Mr. Kauten is retiring in accordance with the Director Retirement Policy, and his successor has been named.

Results of Operations and Financial Condition. On January 29, 2026, First Business Financial Services, Inc. (the “Company”) announced its earnings for the quarter ended December 31, 2025, as well as the declaration of a quarterly cash dividend on its common stock and 7% series A preferred stock. A copy of the Company’s press release containing this information is being “furnished” as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Regulation FD Disclosure. First Business Financial Services, Inc. (the “Company”) issued a press release today announcing that the Company’s Board of Directors declared a quarterly cash dividend on its common stock of $0.29 per share on October 31, 2025. The quarterly dividend is the same as the quarterly dividend declared in July 2025 and is payable on December 3, 2025, to shareholders of record on November 19, 2025. The Board of Directors also declared a dividend on its 7% Series A Preferre…

Results of Operations and Financial Condition. On October 30, 2025, First Business Financial Services, Inc. (the “Company”) announced its earnings for the quarter ended September 30, 2025. A copy of the Company’s press release containing this information is being “furnished” as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Regulation FD Disclosure. First Business Financial Services, Inc. (the “Company”) issued a press release today announcing that the Company’s Board of Directors declared a quarterly cash dividend on its common stock of $0.29 per share on July 25, 2025. The quarterly dividend is the same quarterly dividend declared in April 2025 and is payable on August 25, 2025, to shareholders of record on August 11, 2025. The Board of Directors also declared a dividend on its 7% Series A Preferred Stock, of…

Results of Operations and Financial Condition. On July 24, 2025, First Business Financial Services, Inc. (the “Company”) announced its earnings for the quarter ended June 30, 2025. A copy of the Company’s press release containing this information is being “furnished” as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Director — Jason R. Graham: Mr. Jason R. Graham was appointed as a Class II Director and joined the Audit Committee.

Chief Executive Officer — Corey Chambas: Corey Chambas intends to retire from his role as CEO effective May 2, 2026.

Regulation FD Disclosure. First Business Financial Services, Inc. (the “Company”) issued a press release today announcing that the Company’s Board of Directors declared a quarterly cash dividend on its common stock of $0.29 per share on April 25, 2025. The quarterly dividend is the same quarterly dividend declared in January 2025 and is payable on May 23, 2025, to shareholders of record on May 9, 2025. The Board of Directors also declared a dividend on its 7% Series A Preferred Stock, of $17.…

Results of Operations and Financial Condition. On April 24, 2025, First Business Financial Services, Inc. (the “Company”) announced its earnings for the quarter ended March 31, 2025. A copy of the Company’s press release containing this information is being “furnished” as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Regulation FD Disclosure. First Business Financial Services, Inc. (the “Company”) issued a press release today announcing that the Company’s Board of Directors declared a quarterly cash dividend on its common stock of $0.29 per share on January 31, 2025. The quarterly dividend represents a 16% increase over the quarterly dividend declared in October 2024 and is payable on February 28, 2025, to shareholders of record on February 14, 2025. The Board of Directors also declared a dividend on its…

Results of Operations and Financial Condition. On January 30, 2025, First Business Financial Services, Inc. (the “Company”) announced its earnings for the quarter ended December 31, 2024. A copy of the Company’s press release containing this information is being “furnished” as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Director — Carol P. Sanders: Ms. Sanders resigned from the Board of Directors.

Regulation FD Disclosure. First Business Financial Services, Inc. (the “Company”) issued a press release today announcing that the Company’s Board of Directors declared a quarterly cash dividend on its common stock of $0.25 per share on October 25, 2024. The quarterly dividend is the same as the quarterly dividend declared in July 2024 and is payable on November 20, 2024, to shareholders of record on November 7, 2024. The Board of Directors also declared a dividend on its 7% Series A Preferre…

Results of Operations and Financial Condition. On October 24, 2024, First Business Financial Services, Inc. (the “Company”) announced its earnings for the quarter ended September 30, 2024. A copy of the Company’s press release containing this information is being “furnished” as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Regulation FD Disclosure. First Business Financial Services, Inc. (the “Company”) issued a press release today announcing that the Company’s Board of Directors declared a quarterly cash dividend on its common stock of $0.25 per share on July 26, 2024. The quarterly dividend is the same as the quarterly dividend declared in April 2024 and is payable on August 21, 2024, to shareholders of record on August 8, 2024. The Board of Directors also declared a dividend on its 7% Series A Preferred Stoc…

of this Current Report on Form 8-K and Exhibit 99.1 attached hereto is being “furnished” 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 E…

Executive Vice President — Mark J. Meloy: Mr. Mark J. Meloy intends to retire effective May 1, 2025.

Regulation FD Disclosure. On April 26, 2024, the Board of Directors of First Business Financial Services, Inc. (the “Company”) approved a share repurchase program and authorized certain officers to enter into a Rule 10b5-1 trading plan in connection with the repurchase program at the appropriate time. The program authorizes the repurchase by the Company of shares of common stock with a maximum aggregate purchase price of $5 million, in such quantities, at such prices and on such other terms a…