TUDOR INVESTMENT CORP ET AL
SC 13G/A, 2000-02-10
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*







                                 AHT Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)



                                  COMMON STOCK
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)



                                    00756H108
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


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
<PAGE>


CUSIP No.         00756H108
- --------------------------------------------------------------------------------
     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             576,400
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power        576,400
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                              576,400
- --------------------------------------------------------------------------------
    10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)
                               -------------------------------------------------
- --------------------------------------------------------------------------------
    11)      Percent of Class Represented by Amount in Row 9      5.4%
- --------------------------------------------------------------------------------
    12)      Type of Reporting Person (See Instructions)          CO
- --------------------------------------------------------------------------------


                                     Page 2
<PAGE>


CUSIP No.         00756H108
- --------------------------------------------------------------------------------
     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             616,300
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power        616,300
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                              616,300
- --------------------------------------------------------------------------------
    10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)
                               -------------------------------------------------
- --------------------------------------------------------------------------------
    11)      Percent of Class Represented by Amount in Row 9      5.8%
- --------------------------------------------------------------------------------
    12)      Type of Reporting Person (See Instructions)          IN
- --------------------------------------------------------------------------------


                                     Page 3
<PAGE>


CUSIP No.         00756H108
- --------------------------------------------------------------------------------
     1)      Names of Reporting Person
             S.S. or I.R.S. Identification No. of Above Person
                  Tudor BVI Futures, 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        British Virgin Islands
- --------------------------------------------------------------------------------
                         (5)  Sole Voting Power                     0
Number of Shares         -------------------------------------------------------
Beneficially             (6)  Shared Voting Power             162,600
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power        162,600
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                              162,600
- --------------------------------------------------------------------------------
    10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)
                               -------------------------------------------------
- --------------------------------------------------------------------------------
    11)      Percent of Class Represented by Amount in Row 9      1.5%
- --------------------------------------------------------------------------------
    12)      Type of Reporting Person (See Instructions)          CO
- --------------------------------------------------------------------------------


                                     Page 4
<PAGE>


 CUSIP No.        00756H108
- --------------------------------------------------------------------------------
     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             (6)  Shared Voting Power              39,900
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power         39,900
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                               39,900
- --------------------------------------------------------------------------------
    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)          OO
- --------------------------------------------------------------------------------


                                     Page 5
<PAGE>


CUSIP No.         00756H108
- --------------------------------------------------------------------------------
     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               1,500
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power          1,500
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                                1,500
- --------------------------------------------------------------------------------
    10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)
                               -------------------------------------------------
- --------------------------------------------------------------------------------
    11)      Percent of Class Represented by Amount in Row 9      0.0%
- --------------------------------------------------------------------------------
    12)      Type of Reporting Person (See Instructions)          PN
- --------------------------------------------------------------------------------


                                     Page 6
<PAGE>


CUSIP No.         00756H108
- --------------------------------------------------------------------------------
     1)      Names of Reporting Person
             S.S. or I.R.S. Identification No. of Above Person
                  The Raptor Global Portfolio Ltd.
             -------------------------------------------------------------------
                  98-0211544
             -------------------------------------------------------------------
- --------------------------------------------------------------------------------
     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             374,100
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power        374,100
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                              374,100
- --------------------------------------------------------------------------------
    10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)
                               -------------------------------------------------
- --------------------------------------------------------------------------------
    11)      Percent of Class Represented by Amount in Row 9      3.5%
- --------------------------------------------------------------------------------
    12)      Type of Reporting Person (See Instructions)          CO
- --------------------------------------------------------------------------------


                                     Page 7
<PAGE>


CUSIP No.         00756H108
- --------------------------------------------------------------------------------
     1)      Names of Reporting Person
             S.S. or I.R.S. Identification No. of Above Person
                  The Upper Mill Capital Appreciation Fund 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              38,200
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power         38,200
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                               38,200
- --------------------------------------------------------------------------------
    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 8
<PAGE>


CUSIP No.         00756H108
- --------------------------------------------------------------------------------
     1)      Names of Reporting Person
             S.S. or I.R.S. Identification No. of Above Person
                  The Raptor Global Fund L.P.
             -------------------------------------------------------------------
                  13-3735415
             -------------------------------------------------------------------
- --------------------------------------------------------------------------------
     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                   0
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power              0
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                                    0
- --------------------------------------------------------------------------------
    10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)
                               -------------------------------------------------
- --------------------------------------------------------------------------------
    11)      Percent of Class Represented by Amount in Row 9      0.0%
- --------------------------------------------------------------------------------
    12)      Type of Reporting Person (See Instructions)          PN
- --------------------------------------------------------------------------------


                                     Page 9

<PAGE>


CUSIP No.         00756H108
- --------------------------------------------------------------------------------
     1)      Names of Reporting Person
             S.S. or I.R.S. Identification No. of Above Person
                  The Raptor Global Fund 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                   0
Owned by Each            -------------------------------------------------------
Reporting Person         (7)  Sole Dispositive Power                0
With                     -------------------------------------------------------
                         (8)  Shared Dispositive Power              0
- --------------------------------------------------------------------------------
     9)      Aggregate Amount Beneficially Owned by Each Reporting Person
                                                                    0
- --------------------------------------------------------------------------------
    10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
             (See Instructions)
                               -------------------------------------------------
- --------------------------------------------------------------------------------
    11)      Percent of Class Represented by Amount in Row 9      0.0%
- --------------------------------------------------------------------------------
    12)      Type of Reporting Person (See Instructions)          CO
- --------------------------------------------------------------------------------


                                     Page 10
<PAGE>


Item 1(a).     Name of Issuer:

               AHT Corporation (formerly Advanced Health Corporation)

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

               555 White Plains Road, 2nd Floor
               Tarrytown, New York 10591

Item 2(a).     Name of Person Filing:

               Tudor Investment Corporation ("TIC")
               Paul Tudor Jones, II
               Tudor BVI Futures, Ltd. ("Tudor BVI")
               Tudor Proprietary Trading, L.L.C. ("TPT")
               The Altar Rock Fund L.P. ("Altar Rock")
               The Raptor Global Portfolio Ltd. ("Raptor Portfolio")
               The Upper Mill Capital Appreciation Fund Ltd. ("Upper Mill")
               The Raptor Global Fund L.P. ("Raptor L.P.")
               The Raptor Global Fund Ltd. ("Raptor Ltd.")

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

               The principal business office of each of TIC, TPT, Altar Rock and
               Raptor L.P. is:

                           600 Steamboat Road
                           Greenwich, CT 06830

               The principal business office of Mr. Jones is:

                           c/o Tudor Investment Corporation
                           600 Steamboat Road
                           Greenwich, CT 06830

               The principal business office of each of Tudor BVI, Raptor Ltd.,
               Raptor Portfolio and Upper Mill is:

                           c/o CITCO
                           Kaya Flamboyan 9
                           Curacao, Netherlands Antilles

Item 2(c).     Citizenship:

               TIC is a Delaware corporation
               Tudor BVI is a company organized under the laws of the British
               Virgin Islands
               Mr. Jones is a citizen of the United States
               Raptor L.P. and Altar Rock are Delaware limited partnerships
               TPT is a Delaware limited liability company
               Raptor Ltd., Raptor Portfolio and Upper Mill are companies
               organized under the laws of the Cayman Islands

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

               Common Stock

Item 2(e).     CUSIP Number:

               00756H108


                                     Page 11
<PAGE>


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 December 31, 1999).

         (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 Tudor BVI (162,600 shares), TPT (39,900 shares),
         Altar Rock (1,500 shares), Raptor L.P. (0 shares), Raptor Ltd. (0
         shares), Raptor Portfolio (374,100 shares) and Upper Mill (38,200
         shares). Because TIC is the sole general partner of Raptor L.P. and
         Altar Rock and provides investment advisory services to Raptor
         Portfolio, Raptor Ltd., Tudor BVI and Upper Mill, 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.
         In addition, 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.

              On October 1, 1999, each of Raptor L.P. and Raptor Ltd.
         transferred their entire interest in the Company to Raptor Portfolio,
         their wholly-owned affiliate.

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
<PAGE>


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: February 10, 2000


                                  TUDOR INVESTMENT CORPORATION


                                  By:       /s/ Andrew S. Paul
                                      -----------------------------------------
                                      Andrew S. Paul
                                      Managing Director and General Counsel



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



                                  TUDOR BVI FUTURES, LTD.

                                  By: Tudor Investment Corporation,
                                      Trading Advisor


                                      By:      /s/ Andrew S. Paul
                                          -------------------------------------
                                          Andrew S. Paul
                                          Managing Director and General Counsel


                                  TUDOR PROPRIETARY TRADING, L.L.C.


                                  By:       /s/ Andrew S. Paul
                                      -----------------------------------------
                                      Andrew S. Paul
                                      Managing Director and General Counsel


                                    Page 13
<PAGE>




                                   THE ALTAR ROCK FUND L.P.

                                   By: Tudor Investment Corporation,
                                       General Partner


                                       By:      /s/ Andrew S. Paul
                                           ------------------------------------
                                           Andrew S. Paul
                                           Managing Director and General Counsel


                                   THE RAPTOR GLOBAL PORTFOLIO LTD.

                                   By: Tudor Investment Corporation,
                                       Investment Advisor


                                       By:      /s/ Andrew S. Paul
                                           ------------------------------------
                                           Andrew S. Paul
                                           Managing Director and General Counsel


                                   THE UPPER MILL CAPITAL APPRECIATION FUND LTD.

                                   By: Tudor Investment Corporation,
                                       Sub-Investment Manager


                                       By:          /s/ Andrew S. Paul
                                           ------------------------------------
                                           Andrew S. Paul
                                           Managing Director and General Counsel


                                   THE RAPTOR GLOBAL FUND L.P.

                                   By: Tudor Investment Corporation,
                                       General Partner


                                       By:      /s/ Andrew S. Paul
                                           ------------------------------------
                                           Andrew S. Paul
                                           Managing Director and General Counsel


                                   THE RAPTOR GLOBAL FUND LTD.

                                   By: Tudor Investment Corporation,
                                       Investment Advisor


                                       By:      /s/ Andrew S. Paul
                                           ------------------------------------
                                           Andrew S. Paul
                                           Managing Director and General Counsel






                                    Page 14


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