Interactive Brokers (IBKR) 4: Nemser Earl H sold 22,486 shares of Class A common stock at… (May 28, 2026)

=== 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: Nemser Earl H CIK: 0001391400 Role: Director, Officer (Vice Chairman) --- Non-Derivative Transactions --- [Transaction #1] Security: Class A common stock Date: 2026-05-08 | Code: F (Payment of exercise/tax) Shares: -22,486 | Price: $84.42 Total Value: $1,898,268.12 Shares Owned After: 429,344 | 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/ Raymond Bussiere as authorized signatory for Earl H Nemser (2026-05-28)