Interactive Brokers (IBKR) 4: Conkling Lori A bought 1,167 shares of Class A common stock… (Jan 7, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2025-12-31 10b5-1 Pre-arranged Plan: No --- 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: 2025-12-31 | Code: A (Grant or award) Shares: +1,167 | Price: $0.00 Shares Owned After: 1,167 | Ownership: D (Direct) Footnotes: [F1] This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest in five equal installments, beginning December 31, 2026. [F1] This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest in five equal installments, beginning December 31, 2026. [F2] This amount includes unvested restricted stock units that were awarded under the Plan. [Transaction #2] Security: Class A common stock Date: 2025-12-31 | Code: A (Grant or award) Shares: +389 | Price: $64.31 Total Value: $25,016.59 Shares Owned After: 1,556 | Ownership: D (Direct) Footnotes: [F3] This represents an annual grant of restricted stock units under the Plan for being a member of the issuer's Board of Directors, which vested immediately on 12/31/2025. [F4] The price represents the closing price of the issuer's Class A common stock on December 31, 2025. [F5] This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the Plan and (b) unvested restricted stock units that were awarded under the Plan. --- Footnotes (Complete Index) --- F1: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest in five equal installments, beginning December 31, 2026. F2: This amount includes unvested restricted stock units that were awarded under the Plan. F3: This represents an annual grant of restricted stock units under the Plan for being a member of the issuer's Board of Directors, which vested immediately on 12/31/2025. F4: The price represents the closing price of the issuer's Class A common stock on December 31, 2025. F5: This amount includes (a) Class A common stock attributable to vested restricted stock units that were awarded under the Plan and (b) unvested restricted stock units that were awarded under the Plan. --- Signature --- /s/ /s/ Matthew Kelly as authorized signatory for Lori A Conkling (2026-01-07)