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 OF SECURITIES 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 * TCV VI L P   2. Issuer Name and Ticker or Trading Symbol Interactive Brokers Group, Inc. [IBKR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 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 (Month/Day/Year) 08/04/2009 (Street) PALO ALTO, CA 94301 4. If Amendment, Date Original Filed(Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 08/04/2009   P   16,665 A $ 19.03 (1) 1,423,939 I TCV VI, L.P. (2) (3) Common Stock 08/05/2009   P   46,127 A $ 19.1 (4) 1,470,066 I TCV VI, L.P. (2) (3) Common Stock 08/06/2009   P   17,904 A $ 19.12 (5) 1,487,970 I TCV VI, L.P. (2) (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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
TCV VI L P C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA 94301				May be part of a 13(d) group
Technology Crossover Management VI, L.L.C. C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA 94301				May be part of a 13(d) group
HOAG JAY C C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA 94301		X		May be part of a 13(d) group
KIMBALL RICK C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA 94301		X		May be part of a 13(d) group
DREW JOHN C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA 94301		X		May be part of a 13(d) group
REYNOLDS JON Q JR C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA 94301		X		May be part of a 13(d) group
GRIFFITH WILLIAM C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA 94301		X		May be part of a 13(d) group
Trudeau Robert C/O TECHNOLOGY CROSSOVER VENTURES 528 RAMONA STREET PALO ALTO, CA 94301		X		May be part of a 13(d) group

Signatures

Carla S. Newell Authorized signatory for TCV VI, L.P.		08/06/2009
**Signature of Reporting Person		Date
Carla S. Newell Authorized signatory for Technology Crossover Management VI, L.L.C.		08/06/2009
**Signature of Reporting Person		Date
Carla S. Newell Authorized signatory for Jay C. Hoag		08/06/2009
**Signature of Reporting Person		Date
Carla S. Newell Authorized signatory for Richard H. Kimball		08/06/2009
**Signature of Reporting Person		Date
Carla S. Newell Authorized signatory for John L. Drew		08/06/2009
**Signature of Reporting Person		Date
Carla S. Newell Authorized signatory for Jon Q. Reynolds, Jr.		08/06/2009
**Signature of Reporting Person		Date
Carla S. Newell Authorized signatory for William J.G. Griffith IV		08/06/2009
**Signature of Reporting Person		Date
Carla S. Newell Authorized signatory for Robert W. Trudeau		08/06/2009
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	This transaction was executed in multiple trades at prices ranging from $18.77 to $19.18. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased at each separate price.
(2)	This Form 4 is filed by more than one Reporting Person and is a joint filing with the Form 4 filed by TCV VII, L.P., TCV VII (A), L.P., Technology Crossover Management VII, Ltd., Technology Crossover Management VII, L.P. and Christopher P. Marshall on August 6, 2009.
(3)	These securities are directly held by TCV VI, L.P. Jay C. Hoag, Richard H. Kimball, John L. Drew, Jon Q. Reynolds, Jr., William J.G. Griffith IV and Robert W. Trudeau (collectively, 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)	This transaction was executed in multiple trades at prices ranging from $18.77 to $19.27. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased at each separate price.
(5)	This transaction was executed in multiple trades at prices ranging from $18.97 to $19.36. The price reported above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased at each separate price.

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