Interactive Brokers Group, Inc. (IBKR) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-08 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: Interactive Brokers Group, Inc. (IBKR) CIK: 0001381197 --- Reporting Owner --- Name: Mendonca Denis CIK: 0001665345 Role: Officer (Chief Accounting Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Class A common stock Date: 2026-05-08 | Code: F (Payment of exercise/tax) Shares: -11,157 | Price: $84.42 Total Value: $941,873.94 Shares Owned After: 145,071 | Ownership: D (Direct) Footnotes: [F1] The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date. [F2] 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. --- Footnotes (Complete Index) --- F1: The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date. F2: 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. --- Signature --- /s/ /s/ Denis Mendonca (2026-05-28)