X0508 4 2024-07-25 0001381197 Interactive Brokers Group, Inc. IBKR 0001391400 Nemser Earl H ONE PICKWICK PLAZA GREENWICH CT 06830 true true Vice Chairman false Class A common stock 2024-07-25 4 A 0 100000 118.57 A 100000 I By EN Holdings LLC Class A common stock 104351 D Represents number of securities acquired by a limited liability company, owned by the Reporting Person and his affiliates, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interests in IBG LLC. The per share price provided represents the closing price of the issuer's Class A common stock on 7/25/2024, the date when the exchange described in footnote (1) took place. This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the amended 2007 Stock Incentive Plan ("Plan") and (b) unvested restricted stock units that were awarded under the Plan. /s/ Raymond Bussiere as authorized signatory for Earl H. Nemser 2024-07-29