WESTBRIDGE CAPITAL CORP
SC 13G, 1998-02-24
ACCIDENT & HEALTH INSURANCE
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<PAGE>   1




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

                                 SCHEDULE 13G
                                       
                   Under the Securities Exchange Act of 1934
                               (Amendment No. )*


                            Westbridge Capital Corp.
                   -----------------------------------------
                               (Name of Issuer)
                                       
                                       
                                       
                                       
                                  Common Stock
                   -----------------------------------------
                        (Title of Class of Securities)
                                       
                                       
                                       
                                       
                                   957152101
                   -----------------------------------------
                                (CUSIP Number)
                                       




*  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 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 of 9 Pages 


<PAGE>   2

CUSIP No.  957152101               SCHEDULE 13G      Page   2    of   9   Pages
         ---------------------                           --------  ------- 

  (1)     Name of Reporting Person                
          S.S. or I.R.S. Identification No. of Above Person:                

          Mellon Bank, N.A. as Trustee for the          
          General Motors Employes Domestic Group Pension Trust

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

  (2)     Check the Appropriate Box if a Member of a Group*         (a)   [   ]
                                                                    (b)   [   ] 

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

  (3)     SEC Use Only

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

  (4)     Citizenship or Place of Organization                      

          New York
          ---------------------------------------------------------------------

                       (5)     Sole Voting Power                    
  Number of                                                                   0 
   Shares              --------------------------------------------------------
 Beneficially          (6)     Shared Voting Power                  
  Owned by                                                              635,495
    Each               --------------------------------------------------------
  Reporting            (7)     Sole Dispositive Power               
 Person With                                                                  0
                       --------------------------------------------------------
                       (8)     Shared Dispositive Power             
                                                                        635,495
                       --------------------------------------------------------

  (9)     Aggregate Amount Beneficially Owned by Each Reporting Person         
                                                                        635,495
          ---------------------------------------------------------------------

 (10)     Check Box if the Aggregate Amount in Row (9) Excludes Certain
          Shares*                                                         [   ]

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

 (11)     Percent of Class Represented by Amount in Row (9)           
                                                                           9.3%
          ---------------------------------------------------------------------

 (12)     Type of Reporting Person*
                                                                             EP 
          ---------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                                                    


               
                
              
               
                  
               
                     
              



<PAGE>   3


CUSIP No.   957152101              SCHEDULE 13G      Page   3    of   9   Pages
         ---------------------                           --------  ------- 

  (1)     Name of Reporting Person                 
          S.S. or I.R.S. Identification No. of Above Person:                

          General Motors Investment Management Corporation

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

  (2)     Check the Appropriate Box if a Member of a Group*         (a)   [   ]
                                                                    (b)   [   ] 
          ---------------------------------------------------------------------

  (3)     SEC Use Only

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

  (4)     Citizenship or Place of Organization                      

          Delaware
          ---------------------------------------------------------------------

                       (5)     Sole Voting Power                    
  Number of                                                                   0
   Shares              --------------------------------------------------------
 Beneficially          (6)     Shared Voting Power                  
  Owned by                                                              635,495
    Each               --------------------------------------------------------
  Reporting            (7)     Sole Dispositive Power               
 Person With                                                                  0 
                       --------------------------------------------------------
                       (8)     Shared Dispositive Power             
                                                                        635,495
                       --------------------------------------------------------

  (9)     Aggregate Amount Beneficially Owned by Each Reporting Person         
                                                                        635,495
          ---------------------------------------------------------------------

 (10)     Check Box if the Aggregate Amount in Row (9) Excludes Certain
          Shares*                                                         [   ]

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

 (11)     Percent of Class Represented by Amount in Row (9)           
                                                                           9.3%
          ---------------------------------------------------------------------

 (12)     Type of Reporting Person*
                                                                         IA, CO
          ---------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                                                    


               
                
              
               
                  
               
                     
              



<PAGE>   4
                                                     Page   4   of     9   Pages
                                                         --------  -------- 

Item 1.
      (a)   Name of Issuer:  Westbridge Capital Corp - ("WCC")
                 
      (b)   Address of Issuer's Principal Executive Offices:
                             777 Main St.
                             Fort Worth, TX 76102

Item 2.
      (a)   Name of Person Filing:  
             (i)  Mellon Bank, N.A. as Trustee for the 
                  General Motors Employes Domestic Group Pension
                  Trust ("Trust")
 
            (ii)  General Motors Investment Management Corporation
                  ("GMIMCo")
   
      (b)   Address of Principal Business Office:
             (i)  Trust
                  c/o Mellon Bank, N.A.
                  One Mellon Bank Center
                  Pittsburgh, PA 15258

            (ii)  GMIMCo
                  767 Fifth Avenue
                  New York, New York 10153

      (c)   Citizenship:              
             (i)  Trust - New York
            
            (ii)  GMIMCo - Delaware

      (d)   Title of Class of Securities:
            Common Stock

      (e)   CUSIP Number:              957152102            

Item 3.     If this statement is filed pursuant to Rule 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)  [ X ]  Investment Adviser registered under section 203 of the
                        Investment Advisers Act of 1940 (in the case of GMIMCo)

            (f)  [ X ]  Employee Benefit Plan, Pension Fund which is subject to
                        the provisions of the Employee Retirement Income 
                        Security Act of 1974 or Endowment Fund (in the case of
                        the Trust)

            (g)  [   ]  Parent Holding Company, in accordance with section
                        240.13d-1(b)(ii)(G)

            (h)  [   ]  Group, in accordance with section 230.13d-1(b)(1)(ii)(H)


<PAGE>   5
                                                     Page   5    of    9   Pages
                                                         --------  -------- 

Item 4.   Ownership.  
          
          The Trust is a trust formed under and for the benefit of one or more
          employee benefit plans ("Plans") of General Motors Corporation ("GM")
          and its subsidiaries. GMIMCo is registered as an investment adviser
          under the Investment Advisers Act of 1940. Its principal business is
          providing investment advice and investment management services with
          respect to the assets of the Plans and of certain direct and indirect
          subsidiaries of GM and associated entities. The Trust and GMIMCo are
          referred to herein as the "Reporting Persons."

          GMIMCo has the responsibility to select and terminate investment
          managers with respect to the Plans. One such investment manager acting
          with respect to the Plans is Pecks Management Partners (the "External
          Manager"). The External Manager has discretionary authority over the
          assets of the Plans which it manages including voting and investment
          power with respect to shares of WCC Common included among such assets.
          In view of GMIMCo's authority to terminate the External Manager, the
          following information is being provided as of December 31, 1997 with
          respect to such shares of WCC Common under management by the External
          Manager for the benefit of the Plans(1):

          (a)  Amount of Beneficially Owned:
                 (i) Trust -   635,495 shares (2)
        
                (ii) GMIMCo -  635,495 shares; (2)

          (b)  Percent of Class:
                 (i) Trust -   9.3% (2)

                (ii) GMIMCo -  9.3% (2)

          (c)  Number of shares as to which such person has:
                 (i) sole power to vote or to direct the vote -              0

                (ii) shared power to vote or to direct the vote - 
                     same as set forth under Item 4(a) above

               (iii) sole power to dispose or to direct the 
                     disposition of -                                        0

                (iv) shared power to dispose or to direct the 
                     disposition of - same as set forth under 
                     Item 4(a) above.

          The various trusts established under the Plans invest in a variety of
          investment media, including publicly traded and privately placed
          securities. Such investments could include shares of WCC Common 
          and/or other securities of the Issuer in addition to those referred 
          to in this statement ("Additional Securities"). The investment and 
          voting decisions regarding any Additional Securities which might be 
          owned by such trusts are made by the trustees thereof or unrelated 
          investment managers, who, in so acting, act independently of GMIMCo 
          (although the appointment of such investment managers is subject 
          to authorization of and termination by GMIMCo as noted above). 
          No information regarding any such holdings by such trusts under the 
          Plans is contained in this statement.

Item 5.   Ownership of Five Percent or Less of a Class:   

          Not applicable.

- ------------
(1) Pursuant to Rule 13d-4, the Reporting Persons expressly declare that the
filing of this statement shall not be construed as an admission that any such
Person is, for the purposes of Sections 13(d) or 13(g) of the Securities
Exchange Act of 1934, as amended, the beneficial owner of any securities
covered by this statement.

(2) Includes 635,495 shares which may be acquired upon the conversion of
certain of the Issuer's convertible debt instruments, calculated in accordance
with Rule 13d-3(d)(1).
<PAGE>   6
                                                     Page   6    of   9    Pages
                                                         --------  -------- 

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 the undersigned certifies that, to the best of 
          the undersigned's knowledge and belief, the securities referred to 
          above were acquired in the ordinary course of business and were not 
          acquired for the purpose of and do not have the effect of changing 
          or influencing the control of the issuer of such securities and were
          not acquired in connection with or as a participant in any transaction
          having such purposes or effect.


<PAGE>   7

                                            Page   7    of    9   Pages
                                                --------  -------- 


                                   SIGNATURE

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

Date: February 20, 1998

                               MELLON BANK, N.A. as Trustee for the
                               GENERAL MOTORS EMPLOYES DOMESTIC GROUP
                               PENSION TRUST (as directed by General
                               Motors Investment Management Corporation)

                               By:  Mellon Bank, N.A.
                                 
                               By:  ROBERT F. SASS
                                  --------------------------------------
                                    Name:  Robert F. Sass
                                    Title: Vice President
                                           Mellon Bank, N.A.
<PAGE>   8

                                                   Page   8    of   9    Pages
                                                       --------  -------- 



                                   SIGNATURE


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

Date: February 20, 1998

                               GENERAL MOTORS INVESTMENT MANAGEMENT CORPORATION
                                                                            
                               By:  CHARLES G. FROLAND
                                  ---------------------------------------------
                                    Name:  Charles G. Froland
                                    Title: Managing Director,
                                           North American Fixed Income
<PAGE>   9

                                                    Page    9    of   9    Pages
                                                        ---------  -------- 

                                                              Exhibit 1

                        JOINT REPORTING PERSON AGREEMENT

     This will confirm the agreement by and among all the undersigned that the
Schedule 13G filed on or about this date with respect to the beneficial
ownership by the undersigned of shares of Common Stock of Westbridge Capital
Corp. is being, and any and all amendments to such Schedule may be, filed on
behalf of each of the undersigned. This Agreement may be executed in two or more
counterparts, each of which will be deemed an original, but all of which
together shall constitute one and the same instrument.

Date: February 20, 1998

                               MELLON BANK, N.A. as Trustee for the
                               GENERAL MOTORS EMPLOYES DOMESTIC GROUP
                               PENSION TRUST (as directed by General
                               Motors Investment Management Corporation)

                               By:  ROBERT F. SASS
                                  --------------------------------------
                                    Name:  Robert F. Sass
                                    Title: Vice President
                                           Mellon Bank, N.A.


                               GENERAL MOTORS INVESTMENT MANAGEMENT
                               CORPORATION

                               BY:  CHARLES G. FROLAND
                                  --------------------------------------
                                    Name:  Charles G. Froland
                                    Title: Managing Director,
                                           North American Fixed Income


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