IBKR

SEC source: 0001381197-26-000151 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,584

F1 · balance_after: 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.

SEC source: 0001381197-26-000149 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,559

F1 · balance_after: 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.

SEC source: 0001381197-26-000140 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,534

F1 · balance_after: 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.

SEC source: 0001381197-26-000143 · ownership.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 803,568

F1 · shares: Represents number of securities acquired by a limited liability company, owned by the Reporting Person and his affiliates, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interests in IBG LLC.

F2 · price: The per share price provided represents the closing price of the issuer's Class A common stock on 7/31/2026, the date when the exchange described in footnote (1) took place.

F1 · balance_after: Represents number of securities acquired by a limited liability company, owned by the Reporting Person and his affiliates, in a partial redemption of its interest in IBG Holdings LLC. Such securities were acquired by IBG Holdings LLC from Interactive Brokers Group, Inc. immediately prior to the redemption in exchange for membership interests in IBG LLC.

SEC source: 0001381197-26-000113 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,509

F1 · balance_after: 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.

SEC source: 0001381197-26-000111 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,484

F1 · balance_after: 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.

SEC source: 0001381197-26-000107 · ownership.xml · nonDerivative · entry 1

Mendonca Denis · CIK 0001665345 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 145,071

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date.

F2 · balance_after: 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.

SEC source: 0001381197-26-000108 · ownership.xml · nonDerivative · entry 1

Brody Paul Jonathan · CIK 0001391403 · Director · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,856,806

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date.

F2 · balance_after: 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.

SEC source: 0001381197-26-000106 · ownership.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,215,389

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date.

F2 · balance_after: 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.

SEC source: 0001381197-26-000105 · ownership.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 251,518

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date.

F2 · balance_after: 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.

SEC source: 0001381197-26-000104 · ownership.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 429,344

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2026, the vesting date.

F2 · balance_after: 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.

SEC source: 0001381197-26-000088 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,459

F1 · balance_after: 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.

SEC source: 0001381197-26-000086 · ownership.xml · nonDerivative · entry 1

Harris Lawrence E · CIK 0001406586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 173,482

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.87 to $77.04. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in this footnote (1).

SEC source: 0001381197-26-000074 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,434

F1 · balance_after: 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.

SEC source: 0001381197-26-000068 · ownership.xml · nonDerivative · entry 2

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,409

F1 · balance_after: 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.

SEC source: 0001381197-26-000068 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 2,384

F1 · balance_after: 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.

SEC source: 0001381197-26-000058 · ownership.xml · nonDerivative · entry 5

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · by EN Holdings LLC

Disclosed balance after: 0

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.55 to $75.99.

F1 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.

SEC source: 0001381197-26-000058 · ownership.xml · nonDerivative · entry 4

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · by EN Holdings LLC

Disclosed balance after: 20,469

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $74.55 to $75.54.

F1 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.

SEC source: 0001381197-26-000058 · ownership.xml · nonDerivative · entry 3

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · by EN Holdings LLC

Disclosed balance after: 60,200

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $77.46 to $78.41.

F1 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.

SEC source: 0001381197-26-000058 · ownership.xml · nonDerivative · entry 2

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · by EN Holdings LLC

Disclosed balance after: 63,301

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.46 to $77.45.

F1 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.

SEC source: 0001381197-26-000058 · ownership.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · by EN Holdings LLC

Disclosed balance after: 94,118

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $75.46 to $76.45. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (4) to this Form 4.

F1 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.

SEC source: 0001381197-26-000056 · ownership.xml · nonDerivative · entry 3

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · by EN Holdings LLC

Disclosed balance after: 155,000

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $78.02 to $78.44.

F1 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.

SEC source: 0001381197-26-000056 · ownership.xml · nonDerivative · entry 2

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · by EN Holdings LLC

Disclosed balance after: 215,065

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $77.02 to $78.01.

F1 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.

SEC source: 0001381197-26-000056 · ownership.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Indirect · by EN Holdings LLC

Disclosed balance after: 300,000

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $76.45 to $77.34. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in footnotes (2) - (4) to this Form 4.

F1 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the Reporting Person and his affiliates.

SEC source: 0001381197-26-000044 · ownership.xml · nonDerivative · entry 2

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,334

F3 · shares: 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 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

F2 · balance_after: 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.

SEC source: 0001381197-26-000042 · ownership.xml · nonDerivative · entry 1

Yuen Nicole · CIK 0001818969 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,126

F1 · shares: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The annual awards granted to all directors on December 31 of each year, under the 2007 Stock Incentive Plan as amended ("Plan"), increased 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.

F2 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

SEC source: 0001381197-26-000043 · ownership.xml · nonDerivative · entry 1

Bright Jill · CIK 0001714651 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,082

F1 · shares: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The annual awards granted to all directors on December 31 of each year, under the 2007 Stock Incentive Plan as amended ("Plan"), increased 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.

F2 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

F3 · balance_after: 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 Plan and (c) unvested restricted stock units that were awarded under the Plan.

SEC source: 0001381197-26-000046 · ownership.xml · nonDerivative · entry 1

Harris Lawrence E · CIK 0001406586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 199,482

F1 · shares: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The annual awards granted to all directors on December 31 of each year, under the 2007 Stock Incentive Plan as amended ("Plan"), increased 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.

F2 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

SEC source: 0001381197-26-000055 · ownership.xml · nonDerivative · entry 1

Peterffy William · CIK 0001812281 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,126

F1 · shares: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The annual awards granted to all directors on December 31 of each year, under the 2007 Stock Incentive Plan as amended ("Plan"), increased 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.

F2 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

SEC source: 0001381197-26-000052 · ownership.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 451,830

F1 · shares: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The annual awards granted to all directors on December 31 of each year, under the 2007 Stock Incentive Plan as amended ("Plan"), increased 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.

F2 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

F3 · balance_after: 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.

SEC source: 0001381197-26-000051 · ownership.xml · nonDerivative · entry 1

Brody Paul Jonathan · CIK 0001391403 · Director · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,939,726

F1 · shares: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The annual awards granted to all directors on December 31 of each year, under the 2007 Stock Incentive Plan as amended ("Plan"), increased 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.

F2 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

F3 · balance_after: 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.

SEC source: 0001381197-26-000049 · ownership.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,470,428

F1 · shares: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The annual awards granted to all directors on December 31 of each year, under the 2007 Stock Incentive Plan as amended ("Plan"), increased 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.

F2 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

F3 · balance_after: 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.

SEC source: 0001381197-26-000041 · ownership.xml · nonDerivative · entry 1

Repetto Richard H · CIK 0002007873 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,046

F1 · shares: On January 22, 2026, Interactive Brokers Group, Inc.'s ("Issuer") Board of Directors ("Board") modified the compensation policy for members of the Board. The annual awards granted to all directors on December 31 of each year, under the 2007 Stock Incentive Plan as amended ("Plan"), increased 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.

F2 · price: The price represents the closing price of the Issuer's Class A common stock on December 31, 2025.

F3 · balance_after: 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.

SEC source: 0001381197-26-000021 · ownership.xml · nonDerivative · entry 2

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,556

F3 · shares: 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 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

F5 · balance_after: 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.

SEC source: 0001381197-26-000021 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,167

F1 · shares: 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 · price: 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 · balance_after: This amount includes unvested restricted stock units that were awarded under the Plan.

SEC source: 0001381197-26-000025 · ownership.xml · nonDerivative · entry 1

Yuen Nicole · CIK 0001818969 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,737

F1 · shares: This represents an annual grant of restricted stock units under the amended 2007 Stock Incentive Plan ("Plan") for being a member of the issuer's Board of Directors, which vested immediately on 12/31/2025.

F2 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

F3 · balance_after: On June 17, 2025, the issuer effected a four-for-one split of its Class A common stock, resulting in the Reporting Person's ownership of 7,011 additional shares of Class A common stock.

SEC source: 0001381197-26-000023 · ownership.xml · nonDerivative · entry 1

Bright Jill · CIK 0001714651 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,693

F1 · shares: This represents an annual grant of restricted stock units under the amended 2007 Stock Incentive Plan ("Plan") for being a member of the issuer's Board of Directors, which vested immediately on 12/31/2025.

F2 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

F3 · balance_after: 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 Plan; and (c) unvested restricted stock units that were awarded under the Plan.

SEC source: 0001381197-26-000024 · ownership.xml · nonDerivative · entry 1

Harris Lawrence E · CIK 0001406586 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 199,093

F1 · shares: This represents an annual grant of restricted stock units under the amended 2007 Stock Incentive Plan for being a member of the issuer's Board of Directors, which vested immediately on 12/31/2025.

F2 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

SEC source: 0001381197-26-000031 · ownership.xml · nonDerivative · entry 2

Brody Paul Jonathan · CIK 0001391403 · Director · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,939,337

F3 · shares: 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 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

F2 · balance_after: 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.

SEC source: 0001381197-26-000031 · ownership.xml · nonDerivative · entry 1

Brody Paul Jonathan · CIK 0001391403 · Director · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,938,948

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F2 · balance_after: 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.

SEC source: 0001381197-26-000028 · ownership.xml · nonDerivative · entry 1

Repetto Richard H · CIK 0002007873 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,657

F1 · shares: This represents an annual grant of restricted stock units under the amended 2007 Stock Incentive Plan ("Plan") for being a member of the issuer's Board of Directors, which vested immediately on 12/31/2025.

F2 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

F3 · balance_after: On June 17, 2025, the issuer effected a four-for-one split of its Class A common stock, resulting in the Reporting Person's ownership of 1,701 additional shares of Class A common stock.

F4 · balance_after: 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.

SEC source: 0001381197-26-000022 · ownership.xml · nonDerivative · entry 2

Galik Milan · CIK 0001391404 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,470,039

F3 · shares: 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 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

F2 · balance_after: 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.

SEC source: 0001381197-26-000022 · ownership.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,469,650

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F2 · balance_after: 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.

SEC source: 0001381197-26-000027 · ownership.xml · nonDerivative · entry 2

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 451,441

F3 · shares: 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 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

F2 · balance_after: 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.

SEC source: 0001381197-26-000027 · ownership.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 451,052

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F2 · balance_after: 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.

SEC source: 0001381197-26-000020 · ownership.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 283,248

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F2 · balance_after: On June 17, 2025, the issuer effected a four-for-one split of its common stock, resulting in the Reporting Person's indirect ownership of 201,978 additional shares of common stock.

F3 · balance_after: 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.

SEC source: 0001381197-26-000026 · ownership.xml · nonDerivative · entry 1

Mendonca Denis · CIK 0001665345 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 156,228

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 20% on or about 5/9/2026 and 20% on each of the first four anniversaries of 5/9/2026.

F2 · balance_after: On June 17, 2025, the issuer effected a four-for-one split of its common stock, resulting in the Reporting Person's indirect ownership of 108,804 additional shares of common stock.

F3 · balance_after: 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.

SEC source: 0001381197-26-000019 · ownership.xml · nonDerivative · entry 1

Peterffy William · CIK 0001812281 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,737

F1 · shares: This represents an annual grant of restricted stock units under the amended 2007 Stock Incentive Plan ("Plan") for being a member of the issuer's Board of Directors, which vested immediately on 12/31/2025.

F2 · price: The price represents the closing price of the issuer's Class A common stock on December 31, 2025.

F3 · balance_after: On June 17, 2025, the issuer effected a four-for-one split of its Class A common stock, resulting in the Reporting Person's ownership of 7,011 additional shares of Class A common stock.

SEC source: 0001381197-26-000044 · ownership.xml · nonDerivative · entry 1

Conkling Lori A · CIK 0002067952 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,945

F1 · shares: 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 · price: 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 · balance_after: 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.

SEC source: 0001381197-25-000162 · ownership.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · Immediate Family Member

Disclosed balance after: 0

F1 · shares: On June 17, 2025, the Issuer effected a four-for-one split of its common stock, resulting in the Reporting Person's indirect ownership of 671,766 additional shares of common stock.

F2 · shares: On December 29, 2025, an immediate family member of the Reporting Person transferred 895,688 shares of the Issuer's Class A common stock to an annuity trust of which the Reporting Person is not a beneficiary. The Reporting Person has no investment control over the securities in the trust and no longer has a pecuniary interest in those shares.