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. )*







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



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



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



                                 April 18, 2007
--------------------------------------------------------------------------------
             (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
Owned by         6)   Shared Voting Power               7,181,113
Each                                       -------------------------------------
Reporting       ----------------------------------------------------------------
Person With
                 7)   Sole Dispositive Power                    0
                                              ----------------------------------
                ----------------------------------------------------------------

                 8)   Shared Dispositive Power          7,181,113
                                                --------------------------------
--------------------------------------------------------------------------------

    9)   Aggregate Amount Beneficially
         Owned by Each Reporting Person                 7,181,113
                                        ----------------------------------------
--------------------------------------------------------------------------------

   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)
                            ----------------------------------------------------

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

   11)   Percent of Class Represented by Amount in Row (9)       6.9%
                                                           ---------------------

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

   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
Owned by         6)   Shared Voting Power               7,835,135
Each                                       -------------------------------------
Reporting       ----------------------------------------------------------------
Person With
                 7)   Sole Dispositive Power                    0
                                              ----------------------------------
                ----------------------------------------------------------------

                 8)   Shared Dispositive Power          7,835,135
                                                --------------------------------
--------------------------------------------------------------------------------

    9)   Aggregate Amount Beneficially Owned by
         Each Reporting Person                          7,835,135
                                        ----------------------------------------
--------------------------------------------------------------------------------

   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)
                            ----------------------------------------------------

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

   11)   Percent of Class Represented by Amount in Row (9)       7.5%
                                                           ---------------------

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

   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
Owned by         6)   Shared Voting Power               7,835,135
Each                                       -------------------------------------
Reporting       ----------------------------------------------------------------
Person With
                 7)   Sole Dispositive Power                    0
                                              ----------------------------------
                ----------------------------------------------------------------

                 8)   Shared Dispositive Power          7,835,135
                                                --------------------------------
--------------------------------------------------------------------------------

    9)   Aggregate Amount Beneficially Owned by
         Each Reporting Person                          7,835,135
                                        ----------------------------------------
--------------------------------------------------------------------------------

   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)
                            ----------------------------------------------------

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

   11)   Percent of Class Represented by Amount in Row (9)      7.5%
                                                           ---------------------

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

   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

            Tudor Proprietary Trading, L.L.C.
         -----------------------------------------------------------------------
            13-3720063
         -----------------------------------------------------------------------

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

    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
Owned by         6)   Shared Voting Power                 654,022
Each                                       -------------------------------------
Reporting       ----------------------------------------------------------------
Person With
                 7)   Sole Dispositive Power                    0
                                              ----------------------------------
                ----------------------------------------------------------------

                 8)   Shared Dispositive Power            654,022
                                                --------------------------------
--------------------------------------------------------------------------------

    9)   Aggregate Amount Beneficially Owned by
         Each Reporting Person                            654,022
                                                    ----------------------------
--------------------------------------------------------------------------------

   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)
                            ----------------------------------------------------

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

   11)   Percent of Class Represented by Amount in Row (9)       0.6%
                                                           ---------------------

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

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

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


                                     Page 5






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

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

    1)   Names of Reporting Person

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

         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
Owned by         6)   Shared Voting Power               1,218,219
Each                                       -------------------------------------
Reporting       ----------------------------------------------------------------
Person With
                 7)   Sole Dispositive Power                    0
                                              ----------------------------------
                ----------------------------------------------------------------

                 8)   Shared Dispositive Power          1,218,219
                                                --------------------------------
--------------------------------------------------------------------------------

    9)   Aggregate Amount Beneficially Owned by
         Each Reporting Person                          1,218,219
                                                    ----------------------------
--------------------------------------------------------------------------------

   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)
                            ----------------------------------------------------

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

   11)   Percent of Class Represented by Amount in Row (9)      1.2%
                                                           ---------------------

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

   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 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
Owned by         6)   Shared Voting Power               5,543,193
Each                                       -------------------------------------
Reporting       ----------------------------------------------------------------
Person With
                 7)   Sole Dispositive Power                    0
                                              ----------------------------------
                ----------------------------------------------------------------

                 8)   Shared Dispositive Power          5,543,193
                                                --------------------------------
--------------------------------------------------------------------------------

    9)   Aggregate Amount Beneficially Owned by
         Each Reporting Person                          5,543,193
                                                    ----------------------------
--------------------------------------------------------------------------------

   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)
                            ----------------------------------------------------

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

   11)   Percent of Class Represented by Amount in Row (9)       5.3%
                                                           ---------------------

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

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

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


                                     Page 7






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
Owned by         6)   Shared Voting Power                  48,059
Each                                       -------------------------------------
Reporting       ----------------------------------------------------------------
Person With
                 7)   Sole Dispositive Power                    0
                                              ----------------------------------
                ----------------------------------------------------------------

                 8)   Shared Dispositive Power             48,059
                                                --------------------------------
--------------------------------------------------------------------------------

    9)   Aggregate Amount Beneficially Owned by
         Each Reporting Person                             48,059
                                                    ----------------------------
--------------------------------------------------------------------------------

   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)
                            ----------------------------------------------------

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

   11)   Percent of Class Represented by Amount in Row (9)       0.05%
                                                           ---------------------

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

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

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


                                     Page 8







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

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

    1)   Names of Reporting Person

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

         Witches Rock 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
Owned by         6)   Shared Voting Power                 371,642
Each                                       -------------------------------------
Reporting       ----------------------------------------------------------------
Person With
                 7)   Sole Dispositive Power                    0
                                              ----------------------------------
                ----------------------------------------------------------------

                 8)   Shared Dispositive Power            371,642
                                                --------------------------------
--------------------------------------------------------------------------------

    9)   Aggregate Amount Beneficially Owned by
         Each Reporting Person                            371,642
                                                    ----------------------------
--------------------------------------------------------------------------------

   10)   Check if the Aggregate Amount in Row (9) Excludes Certain Shares
         (See Instructions)
                            ----------------------------------------------------

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

   11)   Percent of Class Represented by Amount in Row (9)      0.4%
                                                           ---------------------

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

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

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


                                     Page 9







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
           Tudor Proprietary Trading, L.L.C. ("TPT")
           The Tudor BVI Global Portfolio Ltd. ("BVI Portfolio")
           The Raptor Global Portfolio Ltd. ("Raptor Portfolio")
           The Altar Rock Fund L.P. ("Altar Rock")
           Witches Rock Portfolio Ltd. ("Witches Rock")

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

           The principal business office of each of TIC and TPT 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, Raptor
           Portfolio, and Witches Rock 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.
           TPT is a Delaware limited liability company.
           BVI Portfolio, Raptor Portfolio, and Witches Rock are companies
           organized under the laws of the Cayman Islands.
           Altar Rock is a Delaware limited partnership.

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


                                     Page 10






           Common Stock, par value $0.01

Item 2(e). CUSIP Number:

           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 April 26, 2007).

           (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 TPT (654,022 shares),  BVI Portfolio  (1,218,219
          shares),  Raptor Portfolio  (5,543,193 shares),  Witches Rock (371,642
          shares),  and  Altar  Rock  (48,059  shares).   Because  TIC  provides
          investment advisory services to BVI Portfolio,  Raptor Portfolio,  and
          Witches  Rock,  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 and
          the indirect controlling equity holder of TPT, Mr. Jones may be deemed
          to  beneficially  own the shares of Common Stock  deemed  beneficially
          owned by TIC and TPT. Mr. Jones  expressly  disclaims such  beneficial
          ownership.  Because Mr.  Pallotta is the portfolio  manager of TIC and
          TPT 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 and TPT.  Mr.  Pallotta  expressly  disclaims  such  beneficial
          ownership.



                                     Page 11






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

                Not applicable

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

Item 9. Notice of Dissolution of Group.

                Not applicable



                                     Page 12






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:     April 27, 2007


                         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



                         TUDOR PROPRIETARY TRADING, L.L.C.


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


                         THE TUDOR BVI GLOBAL PORTFOLIO LTD.

                         By: Tudor Investment Corporation,
                             Trading Advisor

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


                                     Page 13





                         THE RAPTOR GLOBAL PORTFOLIO LTD.

                         By: Tudor Investment Corporation,
                             Investment Adviser


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


                         WITCHES ROCK PORTFOLIO LTD.

                         By: Tudor Investment Corporation,
                             Investment Adviser


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




                                     Page 14