IBKR

SEC source: 0001567619-20-016350 · doc1.xml · nonDerivative · entry 2

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 311,093

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by EN Holdings LLC, which is owned by the reporting person and his affiliates.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.75 to $53.30, inclusive.

F2 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the reporting person and his affiliates.

SEC source: 0001567619-20-016350 · doc1.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 363,696

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by EN Holdings LLC, which is owned by the reporting person and his affiliates.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $53.04 to $53.44, inclusive. 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 (4) - (5) to this Form 4.

F2 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the reporting person and his affiliates.

SEC source: 0001567619-20-016170 · doc1.xml · nonDerivative · entry 2

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 426,196

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by EN Holdings LLC, which is owned by the reporting person and his affiliates.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.99 to $53.30, inclusive.

F2 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the reporting person and his affiliates.

SEC source: 0001567619-20-016170 · doc1.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 626,569

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by EN Holdings LLC, which is owned by the reporting person and his affiliates.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.66 to $53.21, inclusive. 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 (4) - (5) to this Form 4.

F2 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the reporting person and his affiliates.

SEC source: 0001567619-20-016093 · doc1.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 757,150

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by EN Holdings LLC, which is owned by the reporting person and his affiliates.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $52.01 to $52.81, inclusive. 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 footnotes to this Form 4.

F2 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the reporting person and his affiliates.

SEC source: 0001567619-20-016010 · doc1.xml · nonDerivative · entry 2

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 914,019

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by EN Holdings LLC, which is owned by the reporting person and his affiliates.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $51.73 to $52.23, inclusive.

F2 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the reporting person and his affiliates.

SEC source: 0001567619-20-016010 · doc1.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 954,166

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by EN Holdings LLC, which is owned by the reporting person and his affiliates.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $51.88 to $52.01, inclusive. 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 (4) - (5) to this Form 4.

F2 · balance_after: Represents number of securities owned by EN Holdings LLC, which is owned by the reporting person and his affiliates.

SEC source: 0001567619-20-015903 · doc1.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Indirect · By EN Holdings LLC

Disclosed balance after: 1,000,000

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 8/20/2020, the date when the exchange described in footnote (1) took place.

F2 · balance_after: The per share price provided represents the closing price of the issuer's Class A common stock on 8/20/2020, the date when the exchange described in footnote (1) took place.

SEC source: 0001567619-20-011436 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 331,008

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2020, 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: 0001567619-20-011434 · doc1.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 970,204

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2020, 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: 0001567619-20-011432 · doc1.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 651,568

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2020, 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: 0001567619-20-011429 · doc1.xml · nonDerivative · entry 1

Mendonca Denis · CIK 0001665345 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,709

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2020, 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: 0001567619-20-011425 · doc1.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 85,551

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 8, 2020, 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: 0000902664-20-001911 · ownership.xml · nonDerivative · entry 2

Uhde Philip · CIK 0001772442 · Director · See Remarks

Echinus Advisors, LLC · CIK 0001602970 · Director · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 0

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.075 to $39.33, inclusive. The Reporting Persons undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.

F1 · ownership.nature: These securities were held for the account of Echinus Partners, LP, a Delaware limited partnership (the "Echinus Fund"). Echinus Advisors, LLC, a Delaware limited liability Company ("Echinus"), serves as the investment manager to the Echinus Fund. Mr. Philip Uhde ("Mr. Uhde") is the manager and majority controlling person of Echinus. Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein, if any.

SEC source: 0000902664-20-001911 · ownership.xml · nonDerivative · entry 1

Uhde Philip · CIK 0001772442 · Director · See Remarks

Echinus Advisors, LLC · CIK 0001602970 · Director · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnote

Disclosed balance after: 1,652

F2 · kind: On April 23, 2020, the securities were distributed pro rata to the partners of the Echinus Fund (the "Distribution").

F2 · price: On April 23, 2020, the securities were distributed pro rata to the partners of the Echinus Fund (the "Distribution").

F1 · ownership.nature: These securities were held for the account of Echinus Partners, LP, a Delaware limited partnership (the "Echinus Fund"). Echinus Advisors, LLC, a Delaware limited liability Company ("Echinus"), serves as the investment manager to the Echinus Fund. Mr. Philip Uhde ("Mr. Uhde") is the manager and majority controlling person of Echinus. Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his or its pecuniary interest therein, if any.

SEC source: 0001567619-20-000352 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 338,510

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

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: 0001567619-20-000339 · doc1.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,015,322

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

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: 0001567619-20-000332 · doc1.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,490

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

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: 0001567619-20-000304 · doc1.xml · nonDerivative · entry 1

Mendonca Denis · CIK 0001665345 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,797

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

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: 0001567619-20-000314 · doc1.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 675,970

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2020 and 15% on each of the first six anniversaries of 5/9/2020.

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: 0001567619-22-000781 · doc1.xml · nonDerivative · entry 1

Uhde Philip · CIK 0001772442 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 110,453

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, 2020. These shares were inadvertently excluded from Form 4 reporting.

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, 2020. These shares were inadvertently excluded from Form 4 reporting.

F2 · balance_after: This amount includes (a) securities acquired by the Reporting Person and (b) unvested restricted stock units that were awarded under Plan.

SEC source: 0001567619-19-012270 · doc1.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 619,277

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 9, 2019, 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: 0001567619-19-012265 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 317,276

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 9, 2019, 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: 0001567619-19-012250 · doc1.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 900,662

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 9, 2019, 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: 0001567619-19-012246 · doc1.xml · nonDerivative · entry 1

Mendonca Denis · CIK 0001665345 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,577

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 9, 2019, 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: 0001567619-19-000280 · doc1.xml · nonDerivative · entry 1

Damgard John M. · CIK 0001762420 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,873

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, 2019.

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, 2019.

F2 · balance_after: This amount includes (a) Class A common stock previously purchased in open market transactions and (b) unvested restricted stock units that were awarded under the Plan.

SEC source: 0001567619-19-000276 · doc1.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 955,775

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

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: 0001567619-19-000269 · doc1.xml · nonDerivative · entry 1

Nemser Earl H · CIK 0001391400 · Director · Vice Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,811

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

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: 0001567619-19-000262 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 328,714

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

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: 0001567619-19-000257 · doc1.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 650,757

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

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: 0001567619-19-000250 · doc1.xml · nonDerivative · entry 1

Mendonca Denis · CIK 0001665345 · Chief Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,352

F1 · shares: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

F1 · price: This represents a grant of restricted stock units under the 2007 Stock Incentive Plan as amended ("Plan") that will vest 10% on 5/9/2019 and 15% on each of the first six anniversaries of 5/9/2019.

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: 0001567619-18-007307 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 815,458

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-003030 · doc1.xml · nonDerivative · entry 5

Galik Milan · CIK 0001391404 · Director · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 860,993

F1 · shares: These shares were purchased on behalf of the reporting person through a dividend reinvestment program, in which the reporting person is a participant. These shares were inadvertently excluded from Form 4 reporting.

F7 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $59.00 to $59.05, inclusive.

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"); (b) unvested restricted stock units that were awarded under the Plan; and (c) the cumulative shares purchased through the dividend investment program.

SEC source: 0001567619-18-002239 · doc1.xml · nonDerivative · entry 2

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 816,022

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.76, inclusive.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-002239 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 819,411

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.95, inclusive. 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 (4) - (5) to this Form 4.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-002033 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 845,862

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.27, inclusive. 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 footnote (4) to this Form 4.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-001968 · doc1.xml · nonDerivative · entry 2

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 852,733

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-001968 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 853,298

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.26, inclusive. 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 footnote (4) to this Form 4.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-001888 · doc1.xml · nonDerivative · entry 2

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 877,489

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.72, inclusive.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-001888 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 904,222

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.25, inclusive. 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 (4) - (5) to this Form 4.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-001625 · doc1.xml · nonDerivative · entry 2

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 932,461

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.35, inclusive.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-001625 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 939,521

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.55, inclusive. 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 (4) - (5) to this Form 4.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-000754 · doc1.xml · nonDerivative · entry 2

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 961,237

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.16, inclusive.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-000754 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 967,638

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.21, inclusive. 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 (4) - (5) to this Form 4.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001567619-18-000452 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 992,188

F1 · shares: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by IBG Holdings LLC, in which the reporting person has a pecuniary interest through his membership interest in IBG Holdings LLC that went into effect August 1, 2018.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.00 to $62.08, inclusive. 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 footnote (4) to this Form 4.

F2 · balance_after: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC.

SEC source: 0001140361-18-034580 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · By IBG Holdings LLC

Disclosed balance after: 1,000,000

F1 · shares: Represents number of securities owned by IBG Holdings LLC in which the Reporting Person has a pecuniary interest through his membership interest in IBG Holdings LLC. The shares were acquired in a share for share exchange between IBG Holdings LLC and the issuer, in which each share of Class A common stock of the issuer was acquired by IBG Holdings LLC in exchange for one membership interest in IBG LLC.

F2 · price: The per share price provided represents the closing price of the issuer's Class A common stock on 7/27/2018, the date when the exchange described in footnote (1) took place.

SEC source: 0001567619-18-003030 · doc1.xml · nonDerivative · entry 4

Galik Milan · CIK 0001391404 · Director · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 860,566

F1 · shares: These shares were purchased on behalf of the reporting person through a dividend reinvestment program, in which the reporting person is a participant. These shares were inadvertently excluded from Form 4 reporting.

F6 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.73 to $70.13, inclusive.

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"); (b) unvested restricted stock units that were awarded under the Plan; and (c) the cumulative shares purchased through the dividend investment program.

F8 · balance_after: The decrease in securities beneficially owned gives effect to the shares that were withheld for tax purposes related to the May 9, 2018 vesting of restricted stock units awarded under the Plan. This withholding transaction was reported on Form 4, filed with the Securities Exchange Commission on May 22, 2018.

SEC source: 0001140361-18-025213 · doc1.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 603,644

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 9, 2018, 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: 0001140361-18-025203 · doc1.xml · nonDerivative · entry 1

Galik Milan · CIK 0001391404 · Director · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 858,865

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 9, 2018, 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: 0001140361-18-025190 · doc1.xml · nonDerivative · entry 1

Frank Thomas AJ · CIK 0001391401 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 311,058

F1 · price: The price represents the closing price of the issuer's Class A common stock as of May 9, 2018, 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.