SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549
                             ----------------------

                                  SCHEDULE 13G*
                                 (Rule 13d-102)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
           TO RULES 13d-1(b), (c) AND (d) AND AMENDMENTS THERETO FILED
                              PURSUANT TO 13d-2(b)

                         Interactive Brokers Group, Inc.
                                (Name of Issuer)

                              Class A Common Stock
                         (Title of Class of Securities)

                                    45841N107
                                 (CUSIP Number)

                                October 27, 2009
             (Date of event which requires filing of this statement)


     Check the appropriate box to designate the rule pursuant to which this
Schedule 13G is filed:
     [ ] Rule 13d-1(b)
     [x] Rule 13d-1(c)
     [ ] Rule 13d-1(d)





                           (Page 1 of 9 Pages)
----------------
     *The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

     The information required in the remainder of this cover page shall not be
deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act
of 1934 ("Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the
Notes).



CUSIP No. 45841N107                 13G                    Page 2 of 9 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO. OF ABOVE
            PERSONS (ENTITIES ONLY)
                                                     Eminence Capital, LLC
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [x]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            New York
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 2,623,417
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 2,623,417
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 2,623,417

-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                 6.37%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 IA
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!




CUSIP No. 45841N107                 13G                    Page 3 of 9 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO. OF ABOVE
            PERSONS (ENTITIES ONLY)
                                                           Eminence GP, LLC
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [x]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            New York
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 2,623,417
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 2,623,417
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON
                                                 2,623,417
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                6.37%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 OO
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 45841N107                 13G                    Page 4 of 9 Pages

----------------------------------------------------------------------------
     (1)    NAMES OF REPORTING PERSONS
            I.R.S. IDENTIFICATION NO. OF ABOVE
            PERSONS (ENTITIES ONLY)
                                                           Ricky C. Sandler
-----------------------------------------------------------------------------
     (2)    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP **
                                                                  (a)  [ ]
                                                                  (b)  [x]
-----------------------------------------------------------------------------
     (3)    SEC USE ONLY
-----------------------------------------------------------------------------
     (4)    CITIZENSHIP OR PLACE OF ORGANIZATION
                            United States
-----------------------------------------------------------------------------
NUMBER OF      (5)  SOLE VOTING POWER
                                                 0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                                                 2,623,417
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER
                                                 0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER
                                                 2,623,417
-----------------------------------------------------------------------------
     (9)    AGGREGATE AMOUNT BENEFICIALLY OWNED
            BY EACH REPORTING PERSON

                                                 2,623,417
-----------------------------------------------------------------------------
     (10)   CHECK BOX IF THE AGGREGATE AMOUNT
            IN ROW (9) EXCLUDES CERTAIN SHARES **                       [ ]
-----------------------------------------------------------------------------
     (11)   PERCENT OF CLASS REPRESENTED
            BY AMOUNT IN ROW (9)
                                                6.37%
-----------------------------------------------------------------------------
     (12)   TYPE OF REPORTING PERSON **
                                                 IN
-----------------------------------------------------------------------------
                    ** SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 45841N107                 13G                    Page 5 of 9 Pages


Item 1(a).     Name of Issuer:

     The name of the issuer is Interactive Brokers Group, Inc. (the "Company").

Item 1(b).     Address of Issuer's Principal Executive Offices:

     The Company's principal executive offices are located at One Pickwick
Plaza, Greenwich, CT 06830.

Item 2.     Name of Person Filing:

     This statement is filed on behalf of each of the following persons
(collectively, the "Reporting Persons"):

(i) Eminence Capital, LLC, a New York limited liability company ("Eminence
Capital");

(ii) Eminence GP, LLC, a New York limited liability company ("Eminence GP"); and

(iii) Ricky C. Sandler, a U.S. Citizen ("Mr. Sandler").


(a) This statement  relates to shares of Class A Common Stock as defined in Item
2(d) below held for the accounts of: Eminence  Partners,  LP, a New York limited
partnership  ("Eminence  I");  Eminence  Partners  II,  LP, a New  York  limited
partnership  ("Eminence  II");  Eminence  Leveraged  Long Alpha,  LP, a Delaware
limited   partnership   (together   with   Eminence  I  and   Eminence  II,  the
"Partnerships"); as well as Eminence Fund Master, Ltd. ("Eminence Offshore") and
Eminence Leveraged Long Alpha Master, Ltd. (together with Eminence Offshore, the
"Offshore  Funds"),  each a Cayman Islands  company.  The  Partnerships  and the
Offshore Funds are collectively referred to as the "Eminence Funds".

Eminence  Capital  serves as the  management  company to the Eminence Funds with
respect to the shares of Class A Common  Stock  directly  owned by the  Eminence
Funds and may be deemed to have  voting  and  dispositive  power over the shares
held for the accounts of the Eminence Funds.

Eminence GP serves as general  partner or manager  with respect to the shares of
Class A Common Stock  directly  owned by the Eminence Funds and may be deemed to
have voting and  dispositive  power over the shares held for the accounts of the
Eminence Funds.

Mr. Sandler is the Managing Member of each Eminence  Capital and Eminence GP and
may be deemed to have voting and dispositive power with respect to the shares of
Class A Common Stock directly owned by the Eminence Funds.



CUSIP No. 45841N107                13G                   Page 6 of 9 Pages

Item 2(b).     Address of Principal Business Office or, if None, Residence:

     The address of the principal business and principal office of Eminence GP
and Eminence Capital is 65 East 55th Street, 25th Floor, New York, NY 10022. The
business address of Mr. Sandler is 65 East 55th Street, 25th Floor, New York, NY
10022.

Item 2(c).     Citizenship:

    (i) Eminence Capital, a New York limited liability company;

   (ii) Eminence GP, a New York limited liability company; and

  (iii) Mr. Sandler, is a United States citizen.

Item 2(d).     Title of Class of Securities:
     Class A common stock, par value $0.01 per share (the "Class A Common
Stock").

Item 2(e).  CUSIP Number:  45841N107

Item 3. If this statement is filed pursuant to Rules 13d-1(b) or 13d-2(b) or
(c), check whether the person filing is a:

          (a) [ ] Broker or dealer registered under Section 15 of the Act,

          (b) [ ] Bank as defined in Section 3(a)(6) of the Act,

          (c) [ ] Insurance Company as defined in Section 3(a)(19) of the
                  Act,

          (d) [ ] Investment Company registered under Section 8 of the
                  Investment Company Act of 1940,

          (e) [ ] Investment Adviser in accordance with Rule 13d-1
                  (b)(1)(ii)(E),

          (f) [ ] Employee Benefit Plan or Endowment Fund in accordance
                  with Rule 13d-1 (b)(1)(ii)(F),

          (g) [ ] Parent Holding Company or control person in accordance
                  with Rule 13d-1 (b)(1)(ii)(G),

          (h) [ ] Savings Association as defined in Section 3(b) of the
                  Federal Deposit Insurance Act,

          (i) [ ] Church Plan that is excluded from the definition of an
                  investment company under Section 3(c)(14) of the Investment
                  Company Act of 1940,

          (j) [ ] Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

     Not applicable



CUSIP No. 45841N107                 13G                  Page 7 of 9 Pages

Item 4.   Ownership.

         A. Eminence Capital, LLC
         (a) Amount beneficially owned:  2,623,417
         (b) Percent of class: 6.37%. The percentages used herein and in the
rest of Item 4 are calculated based upon the 41,214,498 shares of Class A Common
Stock outstanding at August 10, 2009, as set forth in the Company's Form 10-Q
for the quarterly period ended June 30, 2009.
         (c) (i)   Sole power to vote or direct the vote: 0
             (ii)  Shared power to vote or direct the vote:  2,623,417
             (iii) Sole power to dispose or direct the disposition: 0
             (iv)  Shared power to dispose or direct the disposition:
                   2,623,417

         B. Eminence GP, LLC
         (a) Amount beneficially owned: 2,623,417
         (b) Percent of class: 6.37%
         (c) (i)   Sole power to vote or direct the vote: 0
             (ii)  Shared power to vote or direct the vote: 2,623,417
             (iii) Sole power to dispose or direct the disposition: 0
             (iv)  Shared power to dispose or direct the disposition:
                   2,623,417

         C. Ricky C. Sandler
         (a) Amount beneficially owned: 2,623,417
         (b) Percent of class: 6.37%
         (c) (i)   Sole power to vote or direct the vote: 0
             (ii)  Shared power to vote or direct the vote: 2,623,417
             (iii) Sole power to dispose or direct the disposition: 0
             (iv)  Shared power to dispose or direct the disposition:
                   2,623,417

Item 5.     Ownership of Five Percent or Less of a Class.

     If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following: [ ]

Item 6.     Ownership of More than Five Percent on Behalf of Another Person.

          Eminence GP, the general partner or manager of the Eminence Funds, has
the power to direct the investment  activities of the Eminence Funds,  including
decisions  respecting  the  disposition  of the  proceeds  from  the sale of the
shares.  Eminence Capital provides  management  company services to the Eminence
Funds.  Mr.  Sandler  serves as the Managing  Member of Eminence GP and Eminence
Capital and in that capacity directs their operations.



CUSIP No. 45841N107                 13G                   Page 8 of 9 Pages

Item 7.     Identification and Classification of the Subsidiary Which Acquired
the Security Being Reported on by the Parent Holding Company.

     Not Applicable.

Item 8.  Identification and Classification of Members of the Group.

     Not Applicable.

Item 9.  Notice of Dissolution of Group.

     Not Applicable.

Item 10.  Certification.

     Each of the Reporting Persons hereby makes the following certification:

          By  signing  below I certify  that,  to the best of my  knowledge  and
belief, the securities  referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing  the control of the
issuer of the  securities  and were not acquired and are not held in  connection
with or as a participant in any transaction having that purpose or effect.



CUSIP No. 45841N107                 13G                   Page 9 of 9 Pages

SIGNATURES

After  reasonable  inquiry  and to the best of our  knowledge  and  belief,  the
undersigned  certify that the  information  set forth in this statement is true,
complete and correct.


DATED:  November 6, 2009

                                    /s/ Ricky C. Sandler
                                    ---------------------
                                    Ricky C. Sandler, individually, and as
                                    Managing Member of
                                    Eminence Capital, LLC,
                                       and as
                                    Managing Member of
                                    Eminence GP, LLC