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(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)."}],"balance_after":173482,"source":{"system":"sec-edgar","filing":"0001381197-26-000086","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1406586/000138119726000086/ownership.xml","form_type":"4"}},{"id":931114,"issuer":{"id":279,"kind":"organization","name":"Interactive Brokers Group, Inc.","symbol":"IBKR"},"owners":[{"id":50860,"kind":"person","name":"Harris Lawrence E","position":1,"cik":"0001406586","reported_name":"Harris Lawrence E","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A common stock","published_at":"2026-01-26T21:23:06.000Z","date":"2026-01-01","kind":"grant","planned":false,"acquired":true,"shares":389,"price":64.31,"value":25016.59,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price represents the closing price of the Issuer's Class A common stock on December 31, 2025."}],"balance_after":199482,"source":{"system":"sec-edgar","filing":"0001381197-26-000046","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1406586/000138119726000046/ownership.xml","form_type":"4"}},{"id":944298,"issuer":{"id":279,"kind":"organization","name":"Interactive Brokers Group, Inc.","symbol":"IBKR"},"owners":[{"id":50860,"kind":"person","name":"Harris Lawrence E","position":1,"cik":"0001406586","reported_name":"Harris Lawrence E","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A common stock","published_at":"2026-01-07T21:01:12.000Z","date":"2025-12-31","kind":"grant","planned":false,"acquired":true,"shares":389,"price":64.31,"value":25016.59,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price represents the closing price of the issuer's Class A common stock on December 31, 2025."}],"balance_after":199093,"source":{"system":"sec-edgar","filing":"0001381197-26-000024","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1406586/000138119726000024/ownership.xml","form_type":"4"}},{"id":1010572,"issuer":{"id":279,"kind":"organization","name":"Interactive Brokers Group, Inc.","symbol":"IBKR"},"owners":[{"id":50860,"kind":"person","name":"Harris Lawrence E","position":1,"cik":"0001406586","reported_name":"Harris Lawrence E","relationship":{"director":true}}],"security":"Class A common stock","published_at":"2025-10-31T20:47:06.000Z","date":"2025-10-29","kind":"sale","planned":false,"acquired":false,"shares":10645,"price":69,"value":734505.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.71 to $69.20. 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)."}],"balance_after":198704,"source":{"system":"sec-edgar","filing":"0001381197-25-000155","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1406586/000138119725000155/form4.xml","form_type":"4"}},{"id":1011962,"issuer":{"id":279,"kind":"organization","name":"Interactive Brokers Group, Inc.","symbol":"IBKR"},"owners":[{"id":50860,"kind":"person","name":"Harris Lawrence E","position":1,"cik":"0001406586","reported_name":"Harris Lawrence E","relationship":{"director":true}}],"security":"Class A common stock","published_at":"2025-10-29T20:05:11.000Z","date":"2025-10-28","kind":"sale","planned":false,"acquired":false,"shares":6855,"price":69.15,"value":474023.25,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.15 to $69.18."}],"balance_after":209349,"source":{"system":"sec-edgar","filing":"0001381197-25-000153","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1406586/000138119725000153/form4.xml","form_type":"4"}},{"id":1011961,"issuer":{"id":279,"kind":"organization","name":"Interactive Brokers Group, Inc.","symbol":"IBKR"},"owners":[{"id":50860,"kind":"person","name":"Harris Lawrence E","position":1,"cik":"0001406586","reported_name":"Harris Lawrence E","relationship":{"director":true}}],"security":"Class A common stock","published_at":"2025-10-29T20:05:11.000Z","date":"2025-10-27","kind":"sale","planned":false,"acquired":false,"shares":7500,"price":69.73,"value":522975.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.63 to $69.82. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. 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These shares were sold in multiple transactions at prices ranging from $67.50 to $67.81. The Reporting Person undertakes to provide Interactive Brokers Group, Inc. 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