Interactive Brokers (IBKR) 4: Conkling Lori A bought 389 shares of Class A common stock a… (Jan 26, 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: +389 | Price: $0.00 Shares Owned After: 1,945 | Ownership: D (Direct) Footnotes: [F1] On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The Issuer's Board, under the 2007 Stock Incentive Plan as amended ("Plan"), increased the one-time award granted to external directors on December 31 of the year of appointment from $75,000 to $100,000, retroactive to December 31, 2025. This represents additional restricted stock units granted to the Reporting Person, under the Plan, which will vest in five equal installments, beginning December 31, 2026. [F1] On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The Issuer's Board, under the 2007 Stock Incentive Plan as amended ("Plan"), increased the one-time award granted to external directors on December 31 of the year of appointment from $75,000 to $100,000, retroactive to December 31, 2025. This represents additional restricted stock units granted to the Reporting Person, under the Plan, which will vest in five equal installments, beginning December 31, 2026. [F2] 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. [Transaction #2] Security: Class A common stock Date: 2026-01-01 | Code: A (Grant or award) Shares: +389 | Price: $64.31 Total Value: $25,016.59 Shares Owned After: 2,334 | Ownership: D (Direct) Footnotes: [F3] The Issuer's Board also increased the annual awards granted to all directors on December 31 of each year, under the Plan, from $25,000 to $50,000. This represents additional restricted stock units granted to the Reporting Person, under the Plan, which vested on January 1, 2026. [F4] The price represents the closing price of the Issuer's Class A common stock on December 31, 2025. [F2] 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: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The Issuer's Board, under the 2007 Stock Incentive Plan as amended ("Plan"), increased the one-time award granted to external directors on December 31 of the year of appointment from $75,000 to $100,000, retroactive to December 31, 2025. This represents additional restricted stock units granted to the Reporting Person, under the Plan, which will vest in five equal installments, beginning December 31, 2026. F2: 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. F3: The Issuer's Board also increased the annual awards granted to all directors on December 31 of each year, under the Plan, from $25,000 to $50,000. This represents additional restricted stock units granted to the Reporting Person, under the Plan, which vested on January 1, 2026. F4: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025. --- Signature --- /s/ /s/ Matthew Kelly as authorized signatory for Lori A Conkling (2026-01-26)