TUDOR INVESTMENT CORP ET AL
SC 13G, 1999-07-30
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


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







                               ACT Networks, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)



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


                                    000975102
- --------------------------------------------------------------------------------
                                 (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 000975102
- --------------------------------------------------------------------------------
    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
- --------------------------------------------------------------------------------
Number of Shares    (5) Sole Voting Power                      0
Beneficially        (6) Shared Voting Power              687,600
Owned by Each       (7) Sole Dispositive Power                 0
Reporting Person    (8) Shared Dispositive Power         687,600
With
- --------------------------------------------------------------------------------
    9)    Aggregate Amount Beneficially Owned by Each Reporting Person
               687,600
- --------------------------------------------------------------------------------
   10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
          (See Instructions)
- --------------------------------------------------------------------------------
   11)    Percent of Class Represented by Amount in Row 9        6.8%
- --------------------------------------------------------------------------------
   12)    Type of Reporting Person (See Instructions)            CO
- --------------------------------------------------------------------------------



                                     Page 2
<PAGE>


CUSIP 000975102
- --------------------------------------------------------------------------------
    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
- --------------------------------------------------------------------------------
Number of Shares    (5) Sole Voting Power                      0
Beneficially        (6) Shared Voting Power              729,400
Owned by Each       (7) Sole Dispositive Power                 0
Reporting Person    (8) Shared Dispositive Power         729,400
With
- --------------------------------------------------------------------------------
    9)    Aggregate Amount Beneficially Owned by Each Reporting Person
               729,400
- --------------------------------------------------------------------------------
   10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
          (See Instructions)
- --------------------------------------------------------------------------------
   11)    Percent of Class Represented by Amount in Row 9        7.2%
- --------------------------------------------------------------------------------
   12)    Type of Reporting Person (See Instructions)            IN
- --------------------------------------------------------------------------------



                                     Page 3
<PAGE>

CUSIP 000975102
- --------------------------------------------------------------------------------
    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
- --------------------------------------------------------------------------------
Number of Shares    (5) Sole Voting Power                      0
Beneficially        (6) Shared Voting Power              182,500
Owned by Each       (7) Sole Dispositive Power                 0
Reporting Person    (8) Shared Dispositive Power         182,500
With
- --------------------------------------------------------------------------------
    9)    Aggregate Amount Beneficially Owned by Each Reporting Person
               182,500
- --------------------------------------------------------------------------------
   10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
          (See Instructions)
- --------------------------------------------------------------------------------
   11)    Percent of Class Represented by Amount in Row 9        1.8%
- --------------------------------------------------------------------------------
   12)    Type of Reporting Person (See Instructions)            CO
- --------------------------------------------------------------------------------



                                     Page 4
<PAGE>

CUSIP 000975102
- --------------------------------------------------------------------------------
    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
- --------------------------------------------------------------------------------
Number of Shares    (5) Sole Voting Power                      0
Beneficially        (6) Shared Voting Power               41,800
Owned by Each       (7) Sole Dispositive Power                 0
Reporting Person    (8) Shared Dispositive Power          41,800
With
- --------------------------------------------------------------------------------
    9)    Aggregate Amount Beneficially Owned by Each Reporting Person
               41,800
- --------------------------------------------------------------------------------
   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 000975102
- --------------------------------------------------------------------------------
    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
- --------------------------------------------------------------------------------
Number of Shares    (5) Sole Voting Power                      0
Beneficially        (6) Shared Voting Power               83,000
Owned by Each       (7) Sole Dispositive Power                 0
Reporting Person    (8) Shared Dispositive Power          83,000
With
- --------------------------------------------------------------------------------
    9)    Aggregate Amount Beneficially Owned by Each Reporting Person
                83,000
- --------------------------------------------------------------------------------
   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 6
<PAGE>

CUSIP 000975102
- --------------------------------------------------------------------------------
    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
- --------------------------------------------------------------------------------
Number of Shares    (5) Sole Voting Power                      0
Beneficially        (6) Shared Voting Power              382,200
Owned by Each       (7) Sole Dispositive Power                 0
Reporting Person    (8) Shared Dispositive Power         382,200
With
- --------------------------------------------------------------------------------
    9)    Aggregate Amount Beneficially Owned by Each Reporting Person
               382,200
- --------------------------------------------------------------------------------
   10)    Check if the Aggregate Amount in Row (9) Excludes Certain Shares
          (See Instructions)
- --------------------------------------------------------------------------------
   11)    Percent of Class Represented by Amount in Row 9        3.8%
- --------------------------------------------------------------------------------
   12)    Type of Reporting Person (See Instructions)            CO
- --------------------------------------------------------------------------------



                                     Page 7
<PAGE>

CUSIP 000975102
- --------------------------------------------------------------------------------
    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
- --------------------------------------------------------------------------------
Number of Shares    (5) Sole Voting Power                      0
Beneficially        (6) Shared Voting Power               39,900
Owned by Each       (7) Sole Dispositive Power                 0
Reporting Person    (8) Shared Dispositive Power          39,900
With
- --------------------------------------------------------------------------------
    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)            CO
- --------------------------------------------------------------------------------



                                     Page 8
<PAGE>


Item 1(a).     Name of Issuer:

               ACT Networks, Inc.

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

               188 Camino Ruiz
               Camarillo, CA 93012


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 Raptor Global Fund L.P. ("Raptor L.P.")
               The Raptor Global Fund Ltd. ("Raptor Ltd.")
               The Upper Mill Capital Appreciation Fund Ltd. ("Upper Mill")

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

               The principal business office of each of TIC, TPT, 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.
               and Upper Mill is:

                    c/o CITCO
                    Kaya Flamboyan 9
                    Curacao, Netherland 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. is a Delaware limited partnership
               TPT is a Delaware limited liability company
               Raptor Ltd. 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:

               000975102



                                     Page 9
<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 July 29, 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  (182,500  shares),  TPT
               (41,800  shares),   Raptor  L.P.  (83,000  shares),  Raptor  Ltd.
               (382,200 shares) and Upper Mill (39,900  shares).  Because TIC is
               the sole general  partner of Raptor L.P. and provides  investment
               advisory  services to Raptor  Ltd.,  Raptor  L.P.,  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.

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 10
<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:   July 29, 1999

                                   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



                                    Page 11
<PAGE>



                                   TUDOR PROPRIETARY TRADING, L.L.C.


                                   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


                                   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





                                    Page 12



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