Interactive Brokers (IBKR) 4: Conkling Lori A bought 25 shares at $85.42 on 2026-10-01 (Oct 5, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-10-01 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: Interactive Brokers Group, Inc. (IBKR) CIK: 0001381197 --- Reporting Owner --- Name: Conkling Lori A CIK: 0002067952 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Class A common stock Date: 2026-10-01 | Code: P (Open market purchase) Shares: +25 | Price: $85.42 Total Value: $2,135.50 Shares Owned After: 2,584 | Ownership: D (Direct) Footnotes: [F1] This amount includes (a) securities acquired by the Reporting Person; (b) Class A common stock attributable to vested restricted stock units that were awarded under the 2007 Stock Incentive Plan as amended ("Plan"); and (c) unvested restricted stock units that were awarded under the Plan. --- Footnotes (Complete Index) --- F1: This amount includes (a) securities acquired by the Reporting Person; (b) Class A common stock attributable to vested restricted stock units that were awarded under the 2007 Stock Incentive Plan as amended ("Plan"); and (c) unvested restricted stock units that were awarded under the Plan. --- Signature --- /s/ /s/ Arthur Frye as authorized signatory for Lori A Conkling (2026-10-05)