INVESTCORP S A
SC 13D, 1997-05-14
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                                UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C.  20549

                                  SCHEDULE 13D

                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                          (AMENDMENT NO.            )*
                                         ----------

                              PRIME SERVICE, INC.
- -------------------------------------------------------------------------------
                                (Name of Issuer)


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

                                    74157E1
   -------------------------------------------------------------------------
                                 (CUSIP Number)


   Ronald O. Mueller, Gibson, Dunn & Crutcher, 1050 Connecticut Avenue, N.W.
                          Washington, D.C. 20036-5306
- -------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)

                                 April 8, 1997
            ------------------------------------------------------

            ------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this 
schedule because of Rule 13d-1(b)(3) or (4), check the following box [ ].

Check the following box if a fee is being paid with the statement [ ].
(A fee is not required only if there reporting person: (1) has a previous 
statement on file reporting beneficial ownership of more than five percent of
the class of securities described in Item 1; and (2) has filed no amendment
subsequent thereto reporting beneficial ownership of five percent or less of
such class.)  (See Rule 13d-7.)

NOTE:  Six copies of this statement, including all exhibits, should be
filed with the Commission.  See Rule 13d-1(a) for other parties to whom copies
are to be sent.

*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 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).

<PAGE>   2



                                       SCHEDULE 13D

- -----------------------------------                   -------------------------
CUSIP No.                74157E1                      Page   2  of  15   Pages
- -----------------------------------                   -------------------------

- -------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            INVESTCORP S.A.

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

            Not Applicable                                          (b [ ]
                                           
             

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


- -------------------------------------------------------------------------------
    4       SOURCE OF FUNDS* 

            WC

- -------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED        [ ]
            PURSUANT TO ITEMS 2(d) OR 2(e) 

            Not Applicable

- -------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION  

            Luxembourg

- -------------------------------------------------------------------------------
                             7      SOLE VOTING POWER

         NUMBER OF                  0
                           ---------------------------------------------------- 
          SHARES             8      SHARED VOTING POWER
                                                       
       BENEFICIALLY                 8,049,432          
                                                       
         OWNED BY          ---------------------------------------------------
                             9      SOLE DISPOSITIVE POWER
           EACH                                           
                                    0                     
         REPORTING         ---------------------------------------------------
                             10     SHARED DISPOSITIVE POWER                  
          PERSON                                                              
                                    8,049,432                                 
           WITH            ---------------------------------------------------
                                                                              
- ------------------------------------------------------------------------------
   11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            8,049,432
- -------------------------------------------------------------------------------
   12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN 
            SHARES*                                                         [ ]

            Not Applicable
- -------------------------------------------------------------------------------
   13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            28.75%
- -------------------------------------------------------------------------------
   14       TYPE OF REPORTING PERSON*   
                                        
            CO                          
- -------------------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
*  Filed jointly pursuant to Rule 13d-1(f)(1) of the Securities Exchange Act of
   1934, as amended.


<PAGE>   3
                                       SCHEDULE 13D

- -----------------------------------                   -------------------------
CUSIP No.                74157E1                      Page   3  of  15   Pages
- -----------------------------------                   -------------------------

- -------------------------------------------------------------------------------
    1       NAME OF REPORTING PERSON
            S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

            SIPCO Limited

- -------------------------------------------------------------------------------
    2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*        (a [ ]
                                                                     (b [ ]  
            Not Applicable

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


- -------------------------------------------------------------------------------
    4       SOURCE OF FUNDS* 

            WC

- -------------------------------------------------------------------------------
    5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED        [ ]
            PURSUANT TO ITEMS 2(d) OR 2(e)

            Not Applicable

- -------------------------------------------------------------------------------
    6       CITIZENSHIP OR PLACE OF ORGANIZATION  

            Luxembourg

- -------------------------------------------------------------------------------
                             7      SOLE VOTING POWER

         NUMBER OF                  0
                           ---------------------------------------------------- 
          SHARES             8      SHARED VOTING POWER
                                                       
       BENEFICIALLY                 8,049,432          
                                                       
         OWNED BY          ---------------------------------------------------
                             9      SOLE DISPOSITIVE POWER
           EACH                                           
                                    0                     
         REPORTING         ---------------------------------------------------
                             10     SHARED DISPOSITIVE POWER                  
          PERSON                                                              
                                    8,049,432                                 
           WITH            ---------------------------------------------------
                                                                              
- ------------------------------------------------------------------------------
   11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            8,049,432
- -------------------------------------------------------------------------------
   12       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN  [ ]
            SHARES*

            Not Applicable
- -------------------------------------------------------------------------------
   13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

            28.75%
- -------------------------------------------------------------------------------
   14       TYPE OF REPORTING PERSON*   
                                        
            CO                          
- -------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
                    INCLUDE BOTH SIDES OF THE COVER PAGE,
                RESPONSES TO ITEMS 1-7 (INCLUDING EXHIBITS) OF
                 THE SCHEDULE, AND THE SIGNATURE ATTESTATION.  
*  Filed jointly pursuant to Rule 13d-1(f)(1) of the Securities Exchange Act 
   of 1934, as amended.

<PAGE>   4
        CUSIP NO. 74157E1        SCHEDULE 13D           Page   4   of    15

        This Schedule 13D is being filed jointly pursuant to Rule 13d-1(f)(1)
        of Regulation 13D-G of the General Rules and Regulations under the
        Securities Exchange Act of 1934, as amended, on behalf of Investcorp
        S.A., a Luxembourg corporation, ("Investcorp"), and Sipco Limited, a
        Cayman Islands corporation ("Sipco" and collectively, the "Reporting
        Persons") to report the Reporting Persons' indirect acquisition of
        beneficial ownership of in excess of two percent (2%) of the Common
        Stock of Prime Services, Inc. (the "Reportable Transactions").  The
        Reporting Persons previously filed a Schedule 13G respecting their
        indirect beneficial ownership of approximately 26.6% of the Common
        Stock of Prime Services Inc..  

        ITEM 1.   SECURITY AND ISSUER.

        This Statement on Schedule 13D (the "Schedule 13D") relates to the
        Common Stock, par value $0.01 per share (the "Common Stock"), of Prime
        Service, Inc., a Delaware corporation ("Prime").  The address of the
        principal executive offices of Prime is 16225 Park Ten Place, Suite
        200, Houston, Texas  77084.

        ITEM 2.   IDENTITY AND BACKGROUND.

        For information with respect to the identity and background of each
        director and executive officer of Investcorp and each of the directors
        of Sipco, see Schedule I attached hereto.

        (a)     Name of Person Filing

                (i)   Investcorp S.A.
                (ii)  SIPCO Limited

        (b)     Place of Organization

                (i)   Luxembourg
                (ii)  Cayman Islands

        (c)     Principal Business

                (i)   Investcorp S.A., through its subsidiaries, acts as a
        principal and intermediary in international investment transactions.

                (ii)  Sipco is a passive holding company that has no operations
        and no employees.  

        (d)     Address of Principal Business Offices

                (i)      Investcorp S.A.
                         37 rue Notre-Dame
                         Luxembourg

                (ii)     Sipco Limited
                         P. O. Box 1111
                         West Wind Building
                         George Town, Grand Cayman
                         Cayman Islands, British West Indies
<PAGE>   5


        CUSIP NO. 74157E1          SCHEDULE 13D     Page   5   of   15


        (e)     Criminal Convictions

                During the last five years, neither Investcorp nor Sipco nor, to
                their best knowledge, any person identified on Schedule I has
                (a) been convicted in a criminal proceeding (excluding traffic
                violations or similar misdemeanors) or (b) been a party to a
                civil proceeding of a judicial or administrative body of
                competent jurisdiction as a result of which Investcorp or Sipco,
                or such person, as the case may be, was or is subject to a
                judgment, decree or final order enjoining future violations of,
                or prohibiting or mandating activities subject to, federal or
                state securities laws or finding any violation with respect to
                such laws.

        ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION. 

                (i)        On April 8, 1997, certain entities (the "Managed
                           Entities") which indirectly are managed by
                           subsidiaries of Investcorp through revocable
                           management services or similar agreements with an
                           affiliate of Investcorp pursuant to which each such
                           entity or person indirectly has granted such
                           affiliate the authority to direct the voting and
                           disposition of the Common Stock owned by such entity
                           for so long as such agreement is in effect (the
                           "Management Agreements") purchased 62,700 shares of
                           Prime Common Stock, par value $.01, at a price of
                           $20.9884 per share.

                (ii)       Sipco did not directly acquire any shares of Prime
                           Common Stock.  Sipco, however, may be deemed to
                           control Investcorp through its ownership of a
                           majority of the stock of a company which indirectly
                           owns a majority of Investcorp's outstanding stock.


        ITEM 4.  PURPOSE OF TRANSACTION.

        The Common Stock acquired in the Reportable Transactions was acquired
        on behalf of the Managed Entities for investment purposes.  Prior to
        the Reportable Transactions, Investcorp, the Managed Entities and
        others who frequently co-invest with Investcorp may have been deemed to
        be the beneficial owners of approximately 66.4% of the outstanding
        shares of Common Stock.  Until such time, if ever, that there is a
        significant decrease in the percentage of outstanding shares held by
        such stockholders, these stockholders may be able to control the
        Company through their ability to determine the outcome of votes of
        stockholders regarding, among other things, election of directors and
        approval of significant transactions.  In particular, Investcorp, as
        the beneficial owner of 28.75% of the Common Stock and with
        representatives on the board of directors of the Company, may be able
        to exert influence over the operations of Prime.  

        Investcorp and Sipco may from time to time acquire beneficial 
        owner-ship of additional Common Stock and may from time to time cease
        to have beneficial ownership over Common Stock, depending upon price,
        market conditions, availability of funds, evaluation of alternative
        investments and other factors.  Such acquisitions or dispositions may
        result from investment decisions by Investcorp or its wholly owned
        subsidiaries that indirectly manage the Managed                  
        
<PAGE>   6
        CUSIP NO. 74157E1         SCHEDULE 13D      Page   6   of   15  


        Entities, or from decisions by Investcorp, its subsidiaries or the
        ultimate beneficial owners of the shares of Common Stock held by the 
        Managed Entities to directly or indirectly terminate or revoke 
        the Management Agreements.  Without limitation of the foregoing,
        Investcorp and the ultimate beneficial owners of the shares of Common
        Stock held by the Managed Entities intend to explore means to
        realize favorable returns upon their investment in shares of Common
        Stock and, accordingly, currently and on an on-going basis seek,
        evaluate and/or respond to offers to sell or otherwise dispose of such
        shares, either through open market or privately negotiated 
        transactions.  Such transactions may include transfers of such shares of
        Common Stock to their ultimate beneficial owners, individual sales on
        behalf of the ultimate beneficial owners of the shares of Common Stock
        held by the Managed Entities, underwritten offerings of the shares of
        Common Stock on behalf of more than one of the ultimate beneficial
        owners of the shares of Common Stock held by the Managed Entities, and
        dispositions through negotiated transactions that result in a third
        party's acquisition of all of the shares of Common Stock.  Investcorp
        and Sipco reserve the right to take any action with respect to Prime or
        any of its equity securities in any manner permitted by law.
        
        Except as described above, neither Investcorp nor Sipco is currently
        involved in any plans or proposals which relate to, or could result in
        any material change in the present capitalization or dividend policy of
        Prime, any other material change in Prime's business or corporate
        structure, changes in Prime's charter, bylaws or instruments
        corresponding thereto, or other actions which may impede the
        acquisition of control of Prime by any person.  Additionally, to the
        best of Investcorp and Sipco's knowledge, none of the persons named on
        Schedule I has any current plans which relate to or would result in any
        of the events described in this paragraph.


        ITEM 5.   INTEREST IN SECURITIES OF THE ISSUER.

                (a)      (i)     See Cover Page, Item 11.  Investcorp does not
        directly own any shares of the Common Stock.  As of April 8, 1997,
        Investcorp's beneficial ownership includes 1,089,658 shares owned by
        two indirect wholly-owned subsidiaries of Investcorp.  The remaining
        6,960,274 shares shown as beneficially owned by Investcorp include the
        shares owned by the Managed Entities.  Investcorp may be deemed to
        share beneficial ownership of the shares of Common Stock held by the
        Managed Entities because such entities or their shareholders or
        principals have entered into revocable management services or similar
        agreements with an affiliate of Investcorp pursuant to which each such
        entity or person indirectly has granted such affiliate the authority to
        direct the voting and disposition of the Common Stock owned by such
        entity for so long as such agreement is in effect.  The aggregate
        percentage of shares of Common Stock reported in Item 13 of the Cover
        Page is based upon the 27,991,714 shares of Common Stock outstanding as
        of April 4, 1997, as reported in Prime's proxy statement dated April
        18, 1997.

                         (ii)    SIPCO does not directly own any shares of the
        Common Stock.  The shares listed as beneficially owned by SIPCO consist
        of the shares Investcorp may be deemed to beneficially own. SIPCO,
        which is a passive holding company entity without operations or
        employees, may be deemed to control Investcorp through its ownership of
        a majority of the stock of a company which indirectly owns a majority
        of Investcorp's outstanding stock.


<PAGE>   7
        CUSIP NO. 74157E1          SCHEDULE 13D       Page   7   of   15  

                (b)      (i)  See Cover Page Items 7 and 8.  Investcorp does
        not have the sole power to vote any shares of the Common Stock.
        Investcorp shares the voting power over 1,089,658 shares of the Common
        Stock held by two indirect wholly-owned subsidiaries of Investcorp.  In
        addition, Investcorp may be deemed to share the power to direct the
        voting of an additional 6,960,274 shares of the Common Stock owned by
        the Managed Entities, because such entities or their shareholders or
        principals have entered into revocable management services or similar
        agreements with an affiliate of Investcorp pursuant to which each such
        entity or person indirectly has granted such affiliate the authority to
        direct the voting and disposition of the Common Stock owned by such
        entity for so long as such agreement is in effect.

                         (ii)    SIPCO does not directly own any Common Stock.
        The shares listed as beneficially owned by SIPCO consist of the shares
        Investcorp may be deemed to beneficially own. SIPCO, which is a passive
        holding company entity without operations or employees, may be deemed
        to control Investcorp through its ownership of a majority of the stock
        of a company which indirectly owns a majority of Investcorp's
        outstanding stock.

                (c)      (i)     The following transactions were executed
        within the last sixty days on behalf of the Managed Entities.  All
        transactions were effected through brokerage transactions and/or block
        trades.

                On April 8, 1997, 62,700 shares of Common Stock were acquired
        at $20.9884 per share on behalf of the Managed Entities.

                On April 7, 1997, 3,000 shares of Common Stock were acquired at
        $19.3583 per share on behalf of the Managed Entities.

                On April 4, 1997, 100 shares of Common Stock were acquired at
        $18.2500 per share on behalf of the Managed Entities.

                On April 1, 1997, 10,400 shares of Common Stock were acquired
        at $19.0000  per share on behalf of the Managed Entities.

                On April 1, 1997, 123,000 shares of Common Stock were acquired
        at $19.0000 per share on behalf of the Managed Entities.

                On March 31, 1997, 167,200 shares of Common Stock were acquired
        at $18.9800 per share on behalf of the Managed Entities.

                On March 27, 1997, 220,400 shares of Common Stock were acquired
        at $18.4938 per share on behalf of the Managed Entities.

                         (ii)    SIPCO has not directly acquired any Common
        Stock.  The shares listed as beneficially owned by SIPCO consist of the
        shares Investcorp may be deemed to beneficially own. SIPCO, which is a
        passive holding company entity without operations or employees, may be
        deemed to control Investcorp through its ownership of a majority of the
        stock of a company which indirectly owns a majority of Investcorp's
        outstanding stock.

<PAGE>   8
        CUSIP NO. 74157E1           SCHEDULE 13D       Page   8   of   15


                (d)      None of the Managed Entities has voting or investment
        control over more than five percent of the Common Stock.  At the
        present time, neither Investcorp nor Sipco has a right to receive any
        proceeds from the sale of the shares of Common Stock acquired by the
        Managed Entities, as described in Item 5(c). Investcorp and Sipco
        disclaim any present pecuniary interest in such shares.

                (e)      Not applicable.

                To the best of Investcorp's and Sipco's knowledge, none of the
        outside directors of Investcorp or Sipco, directly or indirectly, have
        the sole or shared power to direct the voting or disposition of any
        shares of the Common Stock.  The information required by Item 5 with
        respect to the executive officers of Investcorp is set forth on
        Schedule II, which is attached  hereto.


        ITEM 6.   CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH
                  RESPECT TO SECURITIES OF THE ISSUER.

                Investcorp has no contracts, arrangements, understandings or
        relationships (legal or otherwise) specifically with respect to the
        securities of Prime.  The Management Agreements indirectly grant
        affiliates of Investcorp the authority to direct the voting,
        acquisition and disposition of any investments undertaken by such
        affiliates on behalf of the Managed Entities, including shares of stock
        of companies the acquisition of which is arranged by other affiliates
        of Investcorp.  Sipco has no contracts, arrangements, understandings or
        relationships with Investcorp or with any other person with respect
        specifically to the Common Stock of Prime.


        ITEM 7.   MATERIALS TO BE FILED AS EXHIBITS.

        None.

        ITEM 8.   CERTIFICATION AND SIGNATURE:

                          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.

              INVESTCORP S.A.                            
                                                         
              BY:  /s/ Gary S. Long                            MAY __, 1997
                  --------------------------------                          
                                                         
                                                         
                      NAME:  Gary S. Long                            
                           --------------------------    
                                                         
                      TITLE: AUTHORIZED REPRESENTATIVE   
                            --------------------------   

<PAGE>   9
        CUSIP NO. 74157E1         SCHEDULE 13D        Page   9   of   15  



SIPCO LIMITED

BY:  /s/ Gary S. Long                                           MAY __, 1997
    --------------------------------                                        


        NAME:  /s/ Gary S. Long                           
             ---------------------------

        TITLE: AUTHORIZED REPRESENTATIVE
              --------------------------

<PAGE>   10
        CUSIP NO. 74157E1           SCHEDULE 13D       Page   10   of   15


                                  SCHEDULE I


                               INVESTCORP S.A.
                                  DIRECTORS

<TABLE>
<CAPTION>
                                                    PRESENT BUSINESS       PRESENT PRINCIPAL
                   NAME                                  ADDRESS               OCCUPATION     
                   ----                           --------------------     -------------------
                           
                           
      <S>                                     <C>                          <C>                                  <C>
      Abdul-Rahman Salim Al Ateeqi            P. O. Box 848                Personal Advisor to H.H. the         Kuwaiti
                                              Safat                        Amir of the State of Kuwait
                                              Kuwait
                                                    

      Ahmed Ali Kanoo                         P. O. Box 45                 Group Chairman of Yusuf Bin          Bahraini
                                              Manama                       Ahmed Kanoo Group of Companies
                                              Bahrain      
                                                           

      Omar A. Aggad                           P.O. Box 2256                Chairman and President of             Saudi
                                              Riyadh 11451                 Aggad Investment Co.
                                              Kingdom of Saudi Arabia 
                                                                      
      Easa Saleh Al Gurg                      P. O. Box 325                Ambassador of the United Arab         U.A.E.
                                              Dubai                        Emirates to the Court of St.
                                              United Arab Emirates         James's
                                                                   
                                                                           Chairman, Easa Saleh Al Gurg
                                                                           Group of Companies, Dubai

                                                                           Director, Emirates
                                                                           International, Dubai

                                                                           Vice Chairman & Director,
                                                                           National Bank of Fujairah

                                                                           Director, Egyptian British
                                                                           Bank, Cairo

      Ahmed Abdullah Al Mannai                P. O. Box 76                 Chairman, Mannai Corporation          Qatari
                                              Doha                         Ltd.
                                              Qatar
                                                   

      Khalid Rashid Al Zayani                 P. O. Box 5553               Group Chairman, Al Zayani            Bahraini
                                              Manama                       Investments Group of Companies
                                              Bahrain
                                                     
</TABLE>
<PAGE>   11
        CUSIP NO. 74157E1           SCHEDULE 13D          Page   11   of   15
<TABLE>
<CAPTION>
                                                    PRESENT BUSINESS       PRESENT PRINCIPAL
                   NAME                                  ADDRESS               OCCUPATION     
                   ----                           --------------------     -------------------
      <S>                                     <C>                          <C>                                  <C>
      Hussain Ibrahim Al-Fardan               P. O. Box 63                 Chairman, Alfardan Group of           Qatari
                                              Doha                         Companies (Holdings) WLL
                                              Qatar   
                                                      
      Nasser Ibrahim Al-Rashid                P. O. Box 4354               Chairman, Rashid Engineering          Saudi
                                              Riyadh 11411
                                              Kingdom of Saudi Arabia

      Abdul Rahman Ali Al-Turki               P. O. Box 718                Chairman and CEO, A.A. Turki          Saudi
                                              Dammam 31421                 Group of Companies
                                              Kingdom of Saudi Arabia
                                                                     
      Mohammed Abdullah Al-Zamil              P. O. Box 285                Chairman and CEO, A.H.               Bahraini
                                              Manama                       Al-Zamil Group of Companies
                                              Bahrain 
                                                      

      Abdullah Taha Bakhsh                    P. O. Box 459                Chairman, TRACO Trading               Saudi
                                              Jeddah 21411                 Engineering & Contracting
                                              Kingdom of Saudi Arabia      Corporation
                                                                     
                                              
      Faraj Ali Bin Hamoodah                  P. O. Box 203                President, Bin Hamoodah Group         U.A.E.
                                              Abu Dhabi                    of Companies
                                              United Arab Emirates
                                                                  
      Bakr Binladen                           P. O. Box 8918               Chairman, Saudi Binladen Group        Saudi
                                              Jeddah                 
                                              Kingdom of Saudi Arabia
                                                                     

      Mustafa Jassim Boodai                   P. O. Box 1287               Chairman, Boodai Corporation         Kuwaiti
                                              Safat 13013  
                                              Kuwait       
                                                           
      Mohammed Yousef Jalal                   P. O. Box 113                Chairman, Mohammed Jalal &           Bahraini
                                              Manama                       Sons Group of Companies
                                              Bahrain

      Nemir Amin Kirdar                       P. O. Box 5340               President and CEO of                 Bahraini
                                              Manama                       Investcorp Bank E.C.
                                              Bahrain

</TABLE>
<PAGE>   12

  CUSIP NO. 74157E1               SCHEDULE 13D          Page    12  of  15      

<TABLE>
<CAPTION>
                                              PRESENT BUSINESS             PRESENT PRINCIPAL
                   NAME                           ADDRESS                      OCCUPATION     
                   ----                       ----------------             -----------------
      <S>                                     <C>                          <C>                                  <C>
                                                     

      Abdul Aziz Jassim Kanoo                 P. O. Box 37                 Deputy Chairman and Deputy            Saudi
                                              Dammam 31411                 CEO, Yusuf Bin Ahmed Kanoo,
                                              Kingdom of Saudi Arabia      Saudi Arabia
                                                                     
</TABLE>
<PAGE>   13
  CUSIP NO. 74157E1               SCHEDULE 13D          Page    13  of  15      

                                   SCHEDULE I

                                SIPCO DIRECTORS

<TABLE>
<CAPTION>
                               PRESENT BUSINESS        PRESENT PRINCIPAL
            NAME                   ADDRESS                OCCUPATION                           CITIZENSHIP
            ----               ----------------        -------------------                   ---------------
<S>                                                   <C>                                        <C>
Hussain Ibrahim Al-Fardan      P. O. Box 63           Chairman, Alfardan Group of                Qatari
                               Doha                   Companies (Holdings) WLL           
                               Qatar                                                     
                                                                                         
Mohammed Yousef Jalal          P. O. Box 113          Chairman, Mohammed Jalal &                 Bahraini
                               Manama                 Sons Group of Companies            
                               Bahrain                                                   
                                                                                         
Nemir Amin Kirdar              P. O. Box 5340         President and CEO of                       Bahraini
                               Manama                 Investcorp Bank E.C.               
                               Bahrain                                                   
                                                                                         
CIP Limited                                                                              
                                                                                         
Abdul-Rahman Salim Al Ateeqi   P. O. Box 848          Personal Advisor to H.H. the               Kuwaiti
                               Safat Kuwait           Amir of the State of Kuwait        
                                                                                         
Ahmed Ali Kanoo                P. O. Box 45           Group Chairman of Yusuf Bin                Bahraini
                               Manama                 Ahmed Kanoo Group of Companies     
                               Bahrain                                                   
                                                                                         
Lawrence B. Kessler            P. O. Box 5340         Chief Administrative Officer               U.S.A.
                               Manama                 of Investcorp S.A.                 
                               Bahrain                                                   
                                                                                         
Gary S. Long                   P. O. Box 5340         Chief Financial Officer                    U.S.A.
                               Manama                 of Investcorp S.A.                                   
                               Bahrain   
</TABLE>
<PAGE>   14

  CUSIP NO. 74157E1               SCHEDULE 13D          Page    14  of  15      


                               INVESTCORP S.A.
                              EXECUTIVE OFFICERS


<TABLE>
<CAPTION>
                                 PRESENT BUSINESS          PRESENT PRINCIPAL
     NAME                            ADDRESS                   OCCUPATION                      CITIZENSHIP
     ----                    --------------------     ----------------------------             ------------                     
<S>                          <C>                      <C>                                          <C>
Nemir Amin Kirdar            P. O. Box 5340           President and CEO of Investcorp               Bahraini
                             Manama                   Bank E.C.
                             Bahrain 
                                     
Lawrence B. Kessler          P. O. Box 5340           Chief Administrative Officer                   U.S.A.
                             Manama                   of Investcorp S.A.
                             Bahrain

Gary S. Long                 P. O. Box 5340           Chief Financial Officer                        U.S.A.
                             Manama                   of Investcorp S.A.
                             Bahrain

Salman A. Abbasi             P. O. Box 5340           Secretary of Investcorp S.A.                   U.S.A.
                             Manama
                             Bahrain
</TABLE>
<PAGE>   15
  CUSIP NO. 74157E1               SCHEDULE 13D          Page    15  of  15      

                                  SCHEDULE II


                                INVESTCORP S.A.
           NUMBER OF SHARES OF PRIME COMMON STOCK BENEFICIALLY OWNED


<TABLE>
<CAPTION>                                               PERCENTAGE OF SHARES
EXECUTIVE                SHARES BENEFICIALLY               OF COMMON STOCK 
OFFICERS                       OWNED                     BENEFICIALLY OWNED 
- ----------------        ---------------------          ---------------------
<S>                             <C>
Nemir Amin Kirdar               187,913                       0.67%

Lawrence B. Kessler              24,335                       0.09%     

Gary S. Long                      9,000                       0.03%

Salman A. Abbasi                 43,669                       0.16%
</TABLE>


  To the best of SIPCO's knowledge, none of  the foregoing individuals have (i)
  effected any transactions in Prime's Common Stock during the past sixty days;
  (ii) any knowledge of any other person who has the right to receive or the
  power to direct the receipt of dividends from, or any proceeds from the sale
  of, the securities that are the subject of this 13-D; or (iii) ceased to be
  the beneficial owner of more than five percent of Prime's Common Stock.





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