ZWEIG DIMENNA PARTNERS L P
SC 13G, 1999-11-15
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                  SCHEDULE 13G



                   Under the Securities Exchange Act of 1934

                               (Amendment No.  )*


                              PLX Technology Inc.
                      ------------------------------------
                               (Name of Issuer)

                                 Common Stock
                      ------------------------------------
                         (Title of Class of Securities)

                                   693417107
                               ----------------
                                (CUSIP Number)


                               November 3, 1999
            -------------------------------------------------------
            (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).



Potential persons who are to respond to the collection of information contained
in this form are not required to respond unless the form displays a currently
valid OMB control number.


SEC 1745 (3-98)


<PAGE>



- -----------------------                                  ---------------------
  CUSIP NO.  693417107               13G                    PAGE 2 OF 8 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS.
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Zweig-DiMenna Special Opportunities, L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            167,600

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             167,600

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
                          167,600
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
10
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
                           0.8%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12

                           PN
- ------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

- -----------------------                                  ---------------------
  CUSIP NO.  693417107              13G                     PAGE 3 OF 8 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSONS.
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

              Zweig-DiMenna Partners, L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
             New York

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            327,600

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             327,600

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
                          327,600
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
                          1.5%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
                          PN

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>


- -----------------------                                  ---------------------
  CUSIP NO.  693107107               13G                    PAGE 4 OF 8 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSONS.
 1    I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY).

              Zweig-DiMenna International Limited

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
               British Virgin Islands

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            606,500

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             606,500

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
                          606,500
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
                          2.7%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
                          CO

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>

- -----------------------                                  ---------------------
  CUSIP NO.  693417107                    13G              PAGE 5 OF 8 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY).

        Zweig-DiMenna International Managers, Inc., on behalf of a
        discretionary account

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
                            Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF              85,700

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                            0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING               85,700

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                            0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
                            85,700
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
                                                                      [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
                               0.4%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
                               CO

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>



- -----------------------                                  ---------------------
  CUSIP NO.  6934177107              13G                    PAGE 6 OF 8 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSONS.
 1    I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

      Gotham Advisors, Inc., on behalf of a discretionary account

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
                                 Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF                   84,400

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                                 0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING                    84,400

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                                 0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
                                 84,400

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
                                 0.4%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12
                                 CO

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!



<PAGE>



- -----------------------                                  ---------------------
  CUSIP NO.  693417107              13G                    PAGE 7 OF 8 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS.
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Zweig-DiMenna Investors L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            8,100

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             8,100

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
                          8,100
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
10
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
                           0.0%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12

                           PN
- ------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>


- -----------------------                                  ---------------------
  CUSIP NO.  693417107              13G                    PAGE 7 OF 8 PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAMES OF REPORTING PERSONS.
 1    I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY).

      Zweig-DiMenna Select L.P.

- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]

- ------------------------------------------------------------------------------
      SEC USE ONLY
 3


- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4
      Delaware

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5
     NUMBER OF            18,700

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          0
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7
    REPORTING             18,700

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          0
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9
                          18,700
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
10
                                                                    [_]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11
                           0.1%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12

                           PN
- ------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>

Item 1(a)      Name of Issuer:
                    PLX Technology Inc.

Item 1(b)      Address of Issuer's Principal Executive Offices:
                    390 Potrero Ave.
                    Sunnyvale, CA 94086

Item 2(a)      Name of Person Filing:

                  See Cover page -- 1

Item 2(b)      Address of Principal Business Office:

                  For all filing persons other than Zweig-DiMenna International
                   Limited:
                  900 Third Avenue, New York, N.Y. 10022
                  For Zweig-DiMenna International Limited:
                  P.O. Box N-9932, Norfolk House, Frederick Street, Nassau,
                   Bahamas

Item 2(c)      Citizenship:

                  See Cover page -- 4

Item 2(d)      Title of Class of Securities:

                  Common Stock

Item 2(e)      CUSIP Number: 693417107


Item 3.        If this statement is filed pursuant to Rule 13d-1(b) or Rule
13D-2(b) or (c), check whether the person filing is a:

               Not Applicable.

Item 4.        Ownership.

Provide the following information regarding the aggregate number and percentage
of the class of securities of the issuer identified in Item 1.

               (a) Amount Beneficially Owned:

                        1,298,600

               (b)  Percent of Class:

                        5.9%

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

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

                             1,298,600

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

                             0

                    (iii) sole power to dispose or to direct the disposition
                          of
                             1,298,600

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

                              0

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.

                              Not Applicable

Item 9.        Notice of Dissolution of Group

                              Not Applicable

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.

<PAGE>

                                    SIGNATURE


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.

Date: November 9 1999

                       ZWEIG-DiMENNA INTERNATIONAL LIMITED

                       By:      Zweig-DiMenna International Managers, Inc.,
                                Investment Manager

                       By:/s/   Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Executive Vice President

                       ZWEIG-DiMENNA PARTNERS, L.P.
                       By: Zweig-DiMenna Associates LLC,
                           Managing General Partner

                       By:/s/  Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Managing Director of Managing General Partner

                       ZWEIG-DiMENNA SPECIAL OPPORTUNITIES, L.P.
                       By:      Zweig-DiMenna Associates LLC,
                                Managing General Partner

                       By:/s/   Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Managing Director of Managing General Partner

                       ZWEIG-DiMENNA INTERNATIONAL MANAGERS, INC.

                       By:/s/   Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Executive Vice President

                       GOTHAM ADVISORS, INC.

                       By:/s/   Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Vice President

                       ZWEIG-DiMENNA INVESTORS, L.P.
                       By: Zweig-DiMenna Associates LLC,
                           Managing General Partner

                       By:/s/   Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Managing Director of Managing
                                General Partner

                       ZWEIG-DiMENNA SELECT,L.P.
                       By: Zweig-DiMenna Associates LLC,
                           Managing General Partner

                       By:/s/   Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Managing Director of Managing
                                General Partner

<PAGE>

                                    EXHIBIT A
                     JOINT FILING AGREEMENT AMONG INVESTORS

         This Joint Filing Agreement is entered into this 4th day of November,
1999 by Zweig-DiMenna International Limited, a British Virgin Islands
corporation,Zweig-DiMenna Partners, L.P., a New York limited partnership, Zweig-
DiMenna Special Opportunities, L.P., a Delaware limited partnership, Zweig-
DiMenna International Managers, Inc., a Delaware corporation, and Gotham
Advisors, Inc., a Delaware corporation, Zweig-DiMenna Investors, L.P., a
Delaware Limited Partnership, Zweig-DiMenna Select,L.P., a Delaware Limited
Partnership, collectively the "Investors". In lieu of filing separate statements
on Schedule 13G, the Investors hereby agree to file a joint statement on
Schedule 13G pursuant to Rule 13D-1(k)(1) under the Securities Exchange Act of
1934 with respect to the Common Stock of PLX Technology Inc.

         This Agreement shall be filed as an exhibit to the statement on
Schedule 13G filed on behalf of the Investors and constitutes the Investors'
consent to file a joint Schedule 13G.

                       ZWEIG-DiMENNA INTERNATIONAL LIMITED

                       By:      Zweig-DiMenna International Managers, Inc.,
                                Investment Manager

                       By:/s/   Joseph A. DiMenna
                          ---------------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Executive Vice President

                       ZWEIG-DiMENNA PARTNERS, L.P.
                       By: Zweig-DiMenna Associates LLC,
                           Managing General Partner

                       By:/s/   Joseph A. DiMenna
                          ---------------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Managing Director of Managing General Partner

                       ZWEIG-DiMENNA SPECIAL OPPORTUNITIES, L.P.
                       By:      Zweig-DiMenna Associates LLC,
                                Managing General Partner

                       By:/s/   Joseph A. DiMenna
                          ---------------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Managing Director of Managing General Partner

                       ZWEIG-DiMENNA INTERNATIONAL MANAGERS, INC.

                       By:/s/   Joseph A. DiMenna
                          ---------------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Executive Vice President

                       GOTHAM ADVISORS, INC.

                       By:/s/   Joseph A. DiMenna
                          ---------------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Vice President

                       ZWEIG-DiMENNA INVESTORS, L.P.
                       By: Zweig-DiMenna Associates LLC,
                           Managing General Partner

                       By:/s/   Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Managing Director of Managing
                                General Partner

                       ZWEIG-DiMENNA SELECT,L.P.
                       By: Zweig-DiMenna Associates LLC,
                           Managing General Partner

                       By:/s/   Joseph A. DiMenna
                          ----------------------------
                       Name:    Joseph A. DiMenna
                       Title:   Managing Director of Managing
                                General Partner



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