FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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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(Print or Type Responses)

1. Name and Address of Reporting Person *   Peterffy Thomas 2. Date of Event Requiring Statement (Month/Day/Year) 05/03/2007 3. Issuer Name and Ticker or Trading Symbol Interactive Brokers Group, Inc. [IBKR] (Last) (First) (Middle) ONE PICKWICK PLAZA 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chairman, CEO & President 5. If Amendment, Date Original Filed(Month/Day/Year) 05/03/2007 (Street) GREENWICH, CT 06830 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Peterffy Thomas ONE PICKWICK PLAZA GREENWICH, CT 06830	  X	  X	  Chairman, CEO & President	Â

Signatures

/s/ Thomas Peterffy		05/03/2007
**Signature of Reporting Person		Date

Explanation of Responses:

No securities are beneficially owned
*	If the form is filed by more than one reporting person, see Instruction 5(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).
  Remarks: Although the reporting person is not the beneficial owner, as defined in Rule 16a-1(a)(2) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), of any securities of the issuer registered under Section 12 of the Exchange Act, the reporting person, through his ownership of the voting membership interests in IBG Holdings LLC will beneficially own all of the outstanding shares of the issuer's Class B common stock. IBG Holdings LLC, as the sole holder of the 100 outstanding shares of the issuer's Class B common stock, is entitled to the number of votes equal to the number of IBG LLC membership interests held by it at any given time. As of the date of this report, the issuer's Class B common stock has 90.0% of the voting power of the issuer, which percentage is expected to decrease proportionately over time to the extent that IBG Holdings LLC owns a smaller percentage of IBG LLC.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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