Sec Form 4 Filing - Galik Milan @ Interactive Brokers Group, Inc. - 2016-11-01

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Galik Milan 2. Issuer Name and Ticker or Trading Symbol Interactive Brokers Group, Inc. [ IBKR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President (Last) (First) (Middle) ONE PICKWICK PLAZA 3. Date of Earliest Transaction (MM/DD/YY) 11/01/2016 (Street) GREENWICH, CT06830 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock 11/01/2016 A 1 ( 1 ) A $ 32.63 734,953 ( 2 ) D Class A Common Stock 11/02/2016 A 1 ( 1 ) A $ 32.42 734,954 ( 2 ) D Class A Common Stock 04/25/2017 S 1 ( 1 ) A $ 34.52 849,751 ( 3 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Galik Milan ONE PICKWICK PLAZA GREENWICH, CT06830 X President Signatures /s/ Raymond Bussiere as authorized signatory for Milan Galik 05/15/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )An investment advisor hired by the reporting person inadvertently purchased / sold shares of IBKR as part of a broad based investment strategy. ( 2 )These shares of Class A Common Stock are owned directly by the reporting person and represent the aggregate number of shares of restricted stock from awards granted under the 2007 Stock Incentive Plan since its inception, less vested shares that were withheld for tax purposes, or sold previously. The reported amount also includes the shares inadvertently purchased by an investment advisor hired by the reporting person as part of a broad based investment strategy. ( 3 )The reported amount also includes the shares sold by an investment advisor hired by the reporting person as part of a broad based investment strategy, as well as shares granted on December 31, 2016 under the 2007 Stock Incentive Plan, previously reported on Form 4 filed with the Securities Exchange Commission on January 4, 2017.

Remarks: This Form 4 is filed to report shares inadvertently purchased on November 1, 2016, November 2, 2016 and sold on April 25, 2017. Subsequently filed Form 4s through January 4, 2017 are hereby amended to reflect the number of shares beneficially owned at the end of the period reported on such form (which are shown in column 5) by the shares shown to be purchased in this report on November 1, 2016 and November 2, 2016.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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