UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. )*

                                  eSPEED, INC.
                                (Name of Issuer)

                      CLASS A COMMON STOCK $0.01 PAR VALUE
                         (Title of Class of Securities)

                                    296643109
                                 (CUSIP Number)

                                OCTOBER 31, 2006
                      (Date of Event which Requires Filing
                               of this Statement)

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

                                [X] Rule 13d-1(b)
                                [ ] 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 on 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).

                          Continued on following pages
                                Page 1 of 5 Pages







                                                               PAGE 2 OF 5 PAGES

1        Names of Reporting Persons
         I.R.S. Identification Nos. of above persons (entities only)

                  PEQUOT CAPITAL MANAGEMENT, INC.
                  06-1524885

2        Check the Appropriate Box If a Member of a Group (See Instructions)
                                a.       [ ]
                                b.       [ ]

3        SEC Use Only

4        Citizenship or Place of Organization

                  CONNECTICUT

                            5             Sole Voting Power
Number of                                          3,480,000
  Shares
Beneficially                6             Shared Voting Power
  Owned By                                         0
    Each
Reporting                   7             Sole Dispositive Power
    Person                                         3,480,000
    With
                            8             Shared Dispositive Power
                                                   0

9        Aggregate Amount Beneficially Owned by Each Reporting Person

                                    3,480,000

10       Check Box If the Aggregate Amount in Row (9) Excludes Certain
         Shares (See Instructions)

                                       [ ]

11       Percent of Class Represented By Amount in Row (9)

                                    11.7%

12       Type of Reporting Person (See Instructions)

                                    IA, CO









                                                               PAGE 3 OF 5 PAGES

ITEM 1(A) NAME OF ISSUER: eSPEED, Inc. (the "Issuer").

     1(B) ADDRESS OF THE ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
             110 East 59th Street,
             New York, New York 10022

ITEM 2(A) - (C) NAME, PRINCIPAL BUSINESS ADDRESS, AND CITIZENSHIP OF PERSON
                FILING:
                Pequot Capital Management, Inc.,
                500 Nyala Farm Road, Westport, CT, 06880,
                which is a Connecticut corporation.

     2(D) TITLE OF CLASS OF SECURITIES: CLASS A COMMON STOCK $0.01 PAR VALUE

     2(E) CUSIP NUMBER: 296643109

ITEM 3. This statement is filed pursuant to Rule 13d-1(b)(1)(ii)(E). Pequot
        Capital Management, Inc. is an investment adviser registered under
        Section 203 of the Investment Advisers Act of 1940.

ITEM 4. OWNERSHIP:

          Ownership as of October 31, 2006 is incorporated herein by reference
          from items (5) - (9) and (11) of the cover page of the Reporting
          Person.

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:

          The Reporting Person is an investment adviser registered under Section
          203 of the Investment Advisers Act of 1940 and, as such, has
          beneficial ownership of the shares which are the subject of this
          filing through the investment discretion the reporting person
          exercises over its clients' accounts. Although such accounts do not
          have beneficial ownership of such shares for purposes of Section 13
          and Section 16 of the Securities Exchange Act of 1934, one account of
          the Reporting Person, Multi-Manager Investment Programmes PCC Limited
          owns of record more than 5% of the Issuer's outstanding shares.


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.




                                                               PAGE 4 OF 5 PAGES

ITEM 10. CERTIFICATION:

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






                                                               PAGE 5 OF 5 PAGES


                                   SIGNATURES


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

Date:  November 10, 2006           PEQUOT CAPITAL MANAGEMENT, INC.



                                   By:      /s/ Aryeh Davis
                                            ------------------------------------
                                   Name:    Aryeh Davis
                                   Title:   Chief Operating Officer, General
                                            Counsel and Secretary