X0609 4 2026-04-28 false 0001381197 Interactive Brokers Group, Inc. IBKR 0001406586 Harris Lawrence E false ONE PICKWICK PLAZA GREENWICH CT 06830 true false false false false Class A common stock 2026-04-28 4 S false 26000 76.93 D 173482 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.87 to $77.04. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in this footnote (1). /s/ Raymond Bussiere as authorized signatory for Lawrence E Harris 2026-04-29