SECURITIES AND 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 RULE 13d-2(b)
                               (Amendment No. 3)*







                           Knight Capital Group, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)



                          Common Stock, $0.01 par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)



                                    499005106
--------------------------------------------------------------------------------
                                 (CUSIP Number)



                                July 17, 2008
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)


Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

[_]         Rule 13d-1(b)

[X]         Rule 13d-1(c)

[_]         Rule 13d-1(d)


* 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 the purpose 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).



                                     Page 1



CUSIP No. 499005106
          -------------------

--------------------------------------------------------------------------------

     1)    Names of Reporting Person

           S.S. or I.R.S. Identification No. of Above Person

                Tudor Investment Corporation
           ---------------------------------------------------------------------
                22-2514825
           ---------------------------------------------------------------------
--------------------------------------------------------------------------------

     2)    Check the Appropriate Box if a Member of a Group (See Instructions)
           (a)
               -----------------------------------------------------------------
           (b)    X
               -----------------------------------------------------------------
--------------------------------------------------------------------------------

     3)    SEC Use Only
                           -----------------------------------------------------
--------------------------------------------------------------------------------

     4)    Citizenship or Place of Organization    Delaware
                                                --------------------------------
--------------------------------------------------------------------------------
                   (5)   Sole Voting Power                    0
                                            ------------------------------------
Number of Shares   -------------------------------------------------------------
Beneficially       (6)   Shared Voting Power          2,795,442
Owned by Each                                 ----------------------------------
Reporting Person   -------------------------------------------------------------
With               (7)   Sole Dispositive Power               0
                                                 -------------------------------
                   -------------------------------------------------------------
                   (8)   Shared Dispositive Power     2,795,442
                                                   -----------------------------
--------------------------------------------------------------------------------
                    9)   Aggregate Amount Beneficially Owned
                         by Each Reporting Person             2,795,442
                                                   -----------------------------
--------------------------------------------------------------------------------
    10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
           (See Instructions)
                              --------------------------------------------------
--------------------------------------------------------------------------------

    11)    Percent of Class Represented by Amount in Row 9          3.0%
                                                             -------------------
--------------------------------------------------------------------------------

    12)    Type of Reporting Person (See Instructions)     CO
                                                        ------------------------
--------------------------------------------------------------------------------



                                     Page 2



CUSIP No. 499005106
          -------------------

--------------------------------------------------------------------------------

     1)    Names of Reporting Person

           S.S. or I.R.S. Identification No. of Above Person

                Paul Tudor Jones, II
           ---------------------------------------------------------------------

           ---------------------------------------------------------------------
--------------------------------------------------------------------------------

     2)    Check the Appropriate Box if a Member of a Group (See Instructions)
           (a)
               -----------------------------------------------------------------
           (b)    X
               -----------------------------------------------------------------
--------------------------------------------------------------------------------

     3)    SEC Use Only
                           -----------------------------------------------------
--------------------------------------------------------------------------------

     4)    Citizenship or Place of Organization    USA
                                                --------------------------------
--------------------------------------------------------------------------------
                   (5)   Sole Voting Power                    0
                                            ------------------------------------
Number of Shares   -------------------------------------------------------------
Beneficially       (6)   Shared Voting Power          2,795,442
Owned by Each                                 ----------------------------------
Reporting Person   -------------------------------------------------------------
With               (7)   Sole Dispositive Power               0
                                                 -------------------------------
                   -------------------------------------------------------------
                   (8)   Shared Dispositive Power     2,795,442
                                                   -----------------------------
--------------------------------------------------------------------------------
                    9)   Aggregate Amount Beneficially Owned
                         by Each Reporting Person             2,795,442
                                                   -----------------------------
--------------------------------------------------------------------------------
    10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
           (See Instructions)
                              --------------------------------------------------
--------------------------------------------------------------------------------

    11)    Percent of Class Represented by Amount in Row 9          3.0%
                                                             -------------------
--------------------------------------------------------------------------------

    12)    Type of Reporting Person (See Instructions)     IN



                                     Page 3



CUSIP No. 499005106
          -------------------

--------------------------------------------------------------------------------

     1)    Names of Reporting Person

           S.S. or I.R.S. Identification No. of Above Person

                James J. Pallotta
           ---------------------------------------------------------------------

           ---------------------------------------------------------------------
--------------------------------------------------------------------------------

     2)    Check the Appropriate Box if a Member of a Group (See Instructions)
           (a)
               -----------------------------------------------------------------
           (b)    X
               -----------------------------------------------------------------
--------------------------------------------------------------------------------

     3)    SEC Use Only
                           -----------------------------------------------------
--------------------------------------------------------------------------------

     4)    Citizenship or Place of Organization    USA
                                                --------------------------------
--------------------------------------------------------------------------------
                   (5)   Sole Voting Power                    0
                                            ------------------------------------
Number of Shares   -------------------------------------------------------------
Beneficially       (6)   Shared Voting Power          2,795,442
Owned by Each                                 ----------------------------------
Reporting Person   -------------------------------------------------------------
With               (7)   Sole Dispositive Power               0
                                                 -------------------------------
                   -------------------------------------------------------------
                   (8)   Shared Dispositive Power     2,795,442
                                                   -----------------------------
--------------------------------------------------------------------------------
                    9)   Aggregate Amount Beneficially Owned
                         by Each Reporting Person             2,795,442
                                                   -----------------------------
--------------------------------------------------------------------------------
    10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
           (See Instructions)
                              --------------------------------------------------
--------------------------------------------------------------------------------

    11)    Percent of Class Represented by Amount in Row 9          3.0%
                                                             -------------------
--------------------------------------------------------------------------------

    12)    Type of Reporting Person (See Instructions)     IN
                                                        ------------------------
--------------------------------------------------------------------------------



                                     Page 4



CUSIP No. 499005106
          -------------------

--------------------------------------------------------------------------------

     1)    Names of Reporting Person

           S.S. or I.R.S. Identification No. of Above Person

           The Tudor BVI Global Portfolio L.P. (f/k/a The Tudor BVI Global
           Portfolio Ltd.)
           ---------------------------------------------------------------------

           ---------------------------------------------------------------------
--------------------------------------------------------------------------------

     2)    Check the Appropriate Box if a Member of a Group (See Instructions)
           (a)
               -----------------------------------------------------------------
           (b)    X
               -----------------------------------------------------------------
--------------------------------------------------------------------------------

     3)    SEC Use Only
                           -----------------------------------------------------
--------------------------------------------------------------------------------

     4)    Citizenship or Place of Organization    Cayman Islands
                                                --------------------------------
--------------------------------------------------------------------------------
                   (5)   Sole Voting Power                    0
                                            ------------------------------------
Number of Shares   -------------------------------------------------------------
Beneficially       (6)   Shared Voting Power                  746,506
Owned by Each                                 ----------------------------------
Reporting Person   -------------------------------------------------------------
With               (7)   Sole Dispositive Power               0
                                                 -------------------------------
                   -------------------------------------------------------------
                   (8)   Shared Dispositive Power             746,506
                                                   -----------------------------
--------------------------------------------------------------------------------
     9)    Aggregate Amount Beneficially Owned
           by Each Reporting Person                           746,506
                                                   -----------------------------
--------------------------------------------------------------------------------
    10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
           (See Instructions)
                              --------------------------------------------------
--------------------------------------------------------------------------------

    11)    Percent of Class Represented by Amount in Row 9          0.8%
                                                             -------------------
--------------------------------------------------------------------------------

    12)    Type of Reporting Person (See Instructions)     PN
                                                        ------------------------
--------------------------------------------------------------------------------



                                     Page 5



CUSIP No. 499005106
          -------------------

--------------------------------------------------------------------------------

     1)    Names of Reporting Person

           S.S. or I.R.S. Identification No. of Above Person

           The Raptor Global Portfolio Ltd.
           ---------------------------------------------------------------------

           ---------------------------------------------------------------------
--------------------------------------------------------------------------------

     2)    Check the Appropriate Box if a Member of a Group (See Instructions)
           (a)
               -----------------------------------------------------------------
           (b)    X
               -----------------------------------------------------------------
--------------------------------------------------------------------------------

     3)    SEC Use Only
                           -----------------------------------------------------
--------------------------------------------------------------------------------

     4)    Citizenship or Place of Organization    Cayman Islands
                                                --------------------------------
--------------------------------------------------------------------------------
                   (5)   Sole Voting Power                    0
                                            ------------------------------------
Number of Shares   -------------------------------------------------------------
Beneficially       (6)   Shared Voting Power          2,028,806
Owned by Each                                 ----------------------------------
Reporting Person   -------------------------------------------------------------
With               (7)   Sole Dispositive Power               0
                                                 -------------------------------
                   -------------------------------------------------------------
                   (8)   Shared Dispositive Power     2,028,806
                                                   -----------------------------
--------------------------------------------------------------------------------
     9)    Aggregate Amount Beneficially Owned
           by Each Reporting Person                   2,028,806
                                                   -----------------------------
--------------------------------------------------------------------------------
    10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
           (See Instructions)
                              --------------------------------------------------
--------------------------------------------------------------------------------

    11)    Percent of Class Represented by Amount in Row 9          2.2%
                                                             -------------------
--------------------------------------------------------------------------------

    12)    Type of Reporting Person (See Instructions)     CO
                                                        ------------------------
--------------------------------------------------------------------------------



                                     Page 6



CUSIP No. 499005106
          -------------------

--------------------------------------------------------------------------------

     1)    Names of Reporting Person

           S.S. or I.R.S. Identification No. of Above Person

           The Altar Rock Fund L.P.
           ---------------------------------------------------------------------
           06-1558414
           ---------------------------------------------------------------------
--------------------------------------------------------------------------------

     2)    Check the Appropriate Box if a Member of a Group (See Instructions)
           (a)
               -----------------------------------------------------------------
           (b)    X
               -----------------------------------------------------------------
--------------------------------------------------------------------------------

     3)    SEC Use Only
                           -----------------------------------------------------
--------------------------------------------------------------------------------

     4)    Citizenship or Place of Organization    Delaware
                                                --------------------------------
--------------------------------------------------------------------------------
                   (5)   Sole Voting Power                    0
                                            ------------------------------------
Number of Shares   -------------------------------------------------------------
Beneficially       (6)   Shared Voting Power          20,130
Owned by Each                                 ----------------------------------
Reporting Person   -------------------------------------------------------------
With               (7)   Sole Dispositive Power               0
                                                 -------------------------------
                   -------------------------------------------------------------
                   (8)   Shared Dispositive Power     20,130
                                                   -----------------------------
--------------------------------------------------------------------------------
     9)    Aggregate Amount Beneficially Owned
           by Each Reporting Person                   20,130
                                                   -----------------------------
--------------------------------------------------------------------------------
    10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
           (See Instructions)
                              --------------------------------------------------
--------------------------------------------------------------------------------

    11)    Percent of Class Represented by Amount in Row 9          0.02%
                                                             -------------------
--------------------------------------------------------------------------------

    12)    Type of Reporting Person (See Instructions)     PN
                                                        ------------------------
--------------------------------------------------------------------------------



                                     Page 7



Item 1(a).    Name of Issuer:

              Knight Capital Group, Inc.

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

              545 Washington Boulevard
              Jersey City, NJ  07310

Item 2(a).    Name of Person Filing:

              Tudor Investment Corporation ("TIC")
              Paul Tudor Jones, II
              James J. Pallotta
              The Tudor  BVI  Global  Portfolio L.P. (f/k/a The Tudor BVI Global
              Portfolio Ltd.) ("BVI Portfolio")
              The Raptor Global Portfolio Ltd. ("Raptor Portfolio")
              The Altar Rock Fund L.P. ("Altar Rock")

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

              The principal business office of TIC is:

                  1275 King Street
                  Greenwich, CT 06831

              The principal business office of Mr. Jones and Altar Rock is:

                  c/o Tudor Investment Corporation
                  1275 King Street
                  Greenwich, CT 06831

              The principal business office of Mr. Pallotta is:

                  c/o Tudor Investment Corporation
                  50 Rowes Wharf, 6th Floor
                  Boston, MA 02110

              The principal business office of each of BVI Portfolio and Raptor
              Portfolio is:

                  c/o CITCO
                  Kaya Flamboyan 9
                  P.O. Box 4774
                  Curacao, Netherlands Antilles

Item 2(c).    Citizenship:

              TIC is a Delaware corporation.
              Messrs. Jones and Pallotta are citizens of the United States.
              BVI Portfolio is a limited  partnership, and Raptor Portfolio is a
              company, each organized under the laws of the Cayman Islands.
              Altar Rock is a Delaware limited partnership.

Item 2(d).    Title of Class of Securities:

              Common Stock, par value $0.01

Item 2(e).    CUSIP Number:



                                     Page 8

              499005106

Item 3.  If this statement is filed  pursuant  to  Rules 13d-1(b),  or 13d-2(b),
         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
         (e) [  ]  Investment Adviser  registered under section 203 of the
                   Investment Advisers Act of 1940
         (f) [  ]  Employment Benefit Plan, Pension Fund which is subject to the
                   provisions of the Employee  Retirement Income Security Act of
                   1974 or Endowment Fund; see section 240.13d-1(b)(1)(ii)(F)
         (g) [  ]  Parent Holding Company, in accordance with section
                   240.13d-1(b)(1)(ii)(G) (Note: See Item 7)
         (h) [  ]  Group, in accordance with section 240.13d-1(b)(1)(ii)(H)

Item 4.  Ownership (As of July 16, 2008).

         (a) Amount Beneficially Owned:  See Item 9 of cover pages

         (b) Percent of Class:  See Item 11 of cover pages

         (c) Number of shares as to which such person has:

            (i)   sole power to vote or to direct the vote

                                                       See Item 5 of cover pages
                                                       -------------------------

            (ii)  shared  power  to vote or to direct the vote

                                                       See Item 6 of cover pages
                                                       -------------------------

            (iii) sole power to dispose or to direct the disposition of

                                                       See Item 7 of cover pages
                                                       -------------------------

            (iv)  shared power to dispose or to direct the disposition of

                                                       See Item 8 of cover pages
                                                       -------------------------

            The shares of Common Stock reported herein as beneficially owned are
         owned  directly by BVI Portfolio  (746,506  shares),  Raptor  Portfolio
         (2,028,806  shares),  and  Altar  Rock  (20,130  shares).  Because  TIC
         provides  investment  advisory  services  to BVI  Portfolio  and Raptor
         Portfolio,  and is the general partner of Altar Rock, TIC may be deemed
         to  beneficially  own the shares of Common  Stock owned by each of such
         Reporting Persons.  TIC expressly disclaims such beneficial  ownership.
         Because Mr. Jones is the controlling  shareholder of TIC, Mr. Jones may
         be deemed  to  beneficially  own the  shares  of  Common  Stock  deemed
         beneficially   owned  by  TIC.  Mr.  Jones  expressly   disclaims  such
         beneficial ownership.  Because Mr. Pallotta is the portfolio manager of
         TIC responsible for investment  decisions with respect to the shares of
         Common  Stock  reported   herein,   Mr.   Pallotta  may  be  deemed  to
         beneficially own the shares of Common Stock deemed  beneficially  owned
         by TIC. Mr. Pallotta expressly disclaims such beneficial ownership.

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

            If this  statement  is  being  filed to  report  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 [X].

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

            Not applicable

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.

            See cover pages

                                     Page 9



Item 9.  Notice of Dissolution of Group.

            Not applicable



                                     Page 10



Item 10. 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.

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


                                    Dated:      July 17, 2008


                                    TUDOR INVESTMENT CORPORATION


                                    By:      /s/ Stephen N. Waldman
                                         ---------------------------------------
                                         Stephen N. Waldman
                                         Managing Director and Associate General
                                            Counsel




                                         /s/ Paul Tudor Jones, II
                                    --------------------------------------------
                                         Paul Tudor Jones, II



                                         /s/ James J. Pallotta
                                    --------------------------------------------
                                         James J. Pallotta


                                    THE TUDOR BVI GLOBAL PORTFOLIO L.P.

                                    By:   Tudor BVI GP Ltd.
                                    Its:  General Partner

                                    By:   Tudor Investment Corporation,
                                          Trading Advisor

                                         By:    /s/ Stephen N. Waldman
                                             -----------------------------------
                                             Stephen N. Waldman
                                             Managing Director and Associate
                                               General Counsel

                                    THE RAPTOR GLOBAL PORTFOLIO LTD.

                                    By:  Tudor Investment Corporation,
                                         Investment Adviser


                                         By:    /s/ Stephen N. Waldman
                                             -----------------------------------
                                             Stephen N. Waldman



                                     Page 11





                                             Managing Director and Associate
                                               General Counsel


                                    THE ALTAR ROCK FUND L.P.

                                    By:  Tudor Investment Corporation,
                                         General Partner


                                         By:    /s/ Stephen N. Waldman
                                             -----------------------------------
                                             Stephen N. Waldman
                                             Managing Director and Associate
                                               General Counsel




                                     Page 12