Sec Form 4 Filing - Trudeau Robert @ Interactive Brokers Group, Inc. - 2009-12-31

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 Trudeau Robert 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 X __ 10% Owner _____ Officer (give title below) X __ Other (specify below) May be part of a 13(d) group (Last) (First) (Middle) C/O TECHNOLOGY CROSSOVER VENTURES, 528 RAMONA STREET 3. Date of Earliest Transaction (MM/DD/YY) 12/31/2009 (Street) PALO ALTO, CA94301 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 Common Stock 12/31/2009 A 4,233 ( 1 ) A $ 0 4,233 I Robert W. Trudeau ( 2 ) Common Stock 1,487,970 I TCV VI, L.P. ( 3 ) Common Stock 2,289,635 I TCV VII, L.P. ( 4 ) Common Stock 1,189,061 I TCV VII (A), L.P. ( 5 ) Common Stock 33,334 I TCV Member Fund, L.P. ( 6 )

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 Trudeau Robert C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA94301 X X May be part of a 13(d) group HOAG JAY C C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA94301 X May be part of a 13(d) group KIMBALL RICK C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA94301 X May be part of a 13(d) group DREW JOHN C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA94301 X May be part of a 13(d) group REYNOLDS JON Q JR C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA94301 X May be part of a 13(d) group GRIFFITH WILLIAM C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA94301 X May be part of a 13(d) group Marshall Christopher P C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA94301 May be part of a 13(d) group Signatures Frederic D. Fenton Authorized signatory for Robert W. Trudeau 01/05/2010 Signature of Reporting Person Date Frederic D. Fenton Authorized signatory for Jay C. Hoag 01/05/2010 Signature of Reporting Person Date Frederic D. Fenton Authorized signatory for Richard H. Kimball 01/05/2010 Signature of Reporting Person Date Frederic D. Fenton Authorized signatory for John L. Drew 01/05/2010 Signature of Reporting Person Date Frederic D. Fenton Authorized signatory for Jon Q. Reynolds, Jr. 01/05/2010 Signature of Reporting Person Date Frederic D. Fenton Authorized signatory for William J.G. Griffith IV 01/05/2010 Signature of Reporting Person Date Frederic D. Fenton Authorized signatory for Christopher P. Marshall 01/05/2010 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents a grant of restricted stock which will vest in five equal annual installments, beginning on December 31, 2010. ( 2 )These shares of restricted stock are directly held by Robert W. Trudeau. Mr. Trudeau has the sole voting and dispositive power over the shares; however, TCV VI Management, L.L.C. ("Management VI") and TCV VII Management, L.L.C. ("Management VII") collectively own 100% of the pecuniary interest therein. Mr. Trudeau, Jay C. Hoag, Richard H. Kimball, John L. Drew, Jon Q. Reynolds, Jr., and William J.G. Griffith IV (collectively, the "TCM VI Members") are members of Management VI and each of the TCM VI Members and Christopher P. Marshall (collectively, the "TCM VII Members") are members of Management VII, but each disclaims beneficial ownership of such shares except to the extent of their pecuniary interest therein. ( 3 )These securities are directly held by TCV VI, L.P. The TCM VI Members are Class A Members of Technology Crossover Management VI, L.L.C. ("TCM VI"), which is the sole general partner of TCV VI, L.P. The TCM VI Members and TCM VI may be deemed to beneficially own the securities held by TCV VI, L.P., but the TCM VI Members and TCM VI disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein. ( 4 )These securities are directly held by TCV VII, L.P. The TCM VII Members are Class A Directors of Technology Crossover Management VII, Ltd. ("TCM VII") and limited partners of Technology Crossover Management VII, L.P. ("TCM VII LP"). TCM VII is the general partner of TCM VII LP, which is the general partner of TCV VII, L.P. The TCM VII Members, TCM VII and TCM VII LP may be deemed to beneficially own the securities held by TCV VII, L.P., but the TCM VII Members , TCM VII and TCM VII LP disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein. ( 5 )These securities are directly held by TCV VII (A), L.P. The TCM VII Members are Class A Directors of TCM VII and limited partners of TCM VII LP. TCM VII is the general partner of TCM VII LP, which is the general partner of TCV VII (A), L.P. The TCM VII Members, TCM VII and TCM VII LP may be deemed to beneficially own the securities held by TCV VII (A), L.P., but the TCM VII Members, TCM VII and TCM VII LP disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein. ( 6 )These securities are directly held by TCV Member Fund, L.P. ("TCV MF"). The TCM VII Members are Class A Directors of TCM VII, which is a general partner of TCV MF, and limited partners of TCV MF. The TCM VI Members are Class A Members of TCM VI, which is also a general partner of TCV MF. The TCM VII Members, TCM VII, the TCM VI Members and TCM VI may be deemed to beneficially own certain of the securities held by TCV MF, but the TCM VII Members, TCM VII, the TCM VI Members and TCM VI disclaim beneficial ownership of such securities except to the extent of their pecuniary interest therein.

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

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