X0508 4 2025-07-30 0001521951 FIRST BUSINESS FINANCIAL SERVICES, INC. FBIZ 0001550649 Graham Jason R 401 CHARMANY DRIVE MADISON WI 53719 1 0 0 0 0 Common Stock 2025-07-30 4 P 0 1000 47.865 A 3220 D The price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $47.50 to $48.25, inclusive. The reporting person undertakes to provide to First Business Financial Services, Inc., any security holders of First Business Financial Services, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. 1,600 shares are held by reporting person's IRA and 1,000 shares are held by the GRAHAM LIVING TRUST, dated August 7, 2009. Peter J. Wilder (Pursuant to Power of Attorney) 2025-08-01