PRUDENTIAL PRIVATE EQUITY INVESTORS III LP
SC 13G, 1998-02-13
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                                 UNITED STATES                 
                       SECURITIES AND EXCHANGE COMMISSION      
                            Washington, D.C.  20549            
                                                               
                                  SCHEDULE 13G                 
                                                               

                   Under the Securities Exchange Act of 1934



                  INTERNATIONAL MANUFACTURING SERVICES, INC.
      -------------------------------------------------------------------      
                               (Name of Issuer)
 

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

                                45985A 10 1 CLA
                    --------------------------------------
                                (CUSIP Number)


Check the following box if a fee is being paid with this statement
[ ].  (A fee is not required only if the filing 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).

*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>
 
CUSIP NO. 45985A 10 1 CLA                  13G                PAGE 2 OF 6 PAGES

- -------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON

   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

   Prudential Private Equity Investors III, L.P.
- -------------------------------------------------------------------------------
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
            
                     4,535,370 shares of Class A Common Stock (includes 
                     2,509,425 shares of Class B Common Stock). /1/
  NUMBER OF      --------------------------------------------------------------
   SHARES        6   SHARED VOTING POWER
BENEFICIALLY 
  OWNED BY       --------------------------------------------------------------
    EACH         7   SOLE DISPOSITIVE POWER
  REPORTING           
 PERSON WITH         4,535,370 shares of Class A Common Stock (includes
                     2,509,425 shares of Class B Common Stock).
                     See footnote 1.
                 --------------------------------------------------------------
                 8   SHARED DISPOSITIVE POWER

- -------------------------------------------------------------------------------
9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   4,535,370 shares of Class A Common Stock (includes 2,509,425
   shares of Class B Common Stock).
   See footnote 1.
- -------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
                                                                        [  ]
- -------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

   24.7%
- -------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON

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

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

/1/    The 2,509,425 shares of Class B Common Stock are convertible on a 1-for-1
basis into Class A Common Stock.  The conversion rights are subject to certain
limitations with respect to the aggregate percentage of ownership of the Class A
Common Stock allowed by the Reporting Person.  In no event can the Reporting
Person own in excess of 19.9% of the outstanding Class A Common Stock and other
limitations may reduce such allowed percentage.
<PAGE>
 
CUSIP NO. 45985A 10 1 CLA                  13G                PAGE 3 OF 6 PAGES
 
- -------------------------------------------------------------------------------
1  NAME OF REPORTING PERSON

   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

   Cornerstone Equity Investors, L.L.C.
- -------------------------------------------------------------------------------
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
            
                     4,535,370 shares of Class A Common Stock (includes 
                     2,509,425 shares of Class B Common Stock). /1/
  NUMBER OF      --------------------------------------------------------------
   SHARES        6   SHARED VOTING POWER
BENEFICIALLY
  OWNED BY       --------------------------------------------------------------
    EACH         7   SOLE DISPOSITIVE POWER
  REPORTING          
 PERSON WITH         4,535,370 shares of Class A Common Stock (includes
                     2,509,425 shares of Class B Common Stock).
                 --------------------------------------------------------------
                 8   SHARED DISPOSITIVE POWER

- -------------------------------------------------------------------------------
9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

   4,535,370 shares of Class A Common Stock (includes 2,509,425
   shares of Class B Common Stock).
   See footnote 1.
- -------------------------------------------------------------------------------
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
                                                                        [  ]
- -------------------------------------------------------------------------------
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

   24.7%
- -------------------------------------------------------------------------------
12 TYPE OF REPORTING PERSON

   OO
- -------------------------------------------------------------------------------
<PAGE>
 
CUSIP NO. 45985A 10 1 CLA                                     PAGE 4 OF 6 PAGES

Item 1(a).  Name of Issuer:
- -------------------------- 

          International Manufacturing Services, Inc.

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

          2071 Concourse Drive
          San Jose, CA 95131

Item 2(a).  Name of Persons Filing:
- -----------------------------------

          Prudential Private Equity Investors III, L.P. and Cornerstone Equity
          Investors, L.L.C.
          Prudential Private Equity Investors III, L.P. ("PPEI III") is a New
          York limited partnership.  Its sole general partner is Prudential
          Equity Investors, Inc., an indirect wholly-owned subsidiary of The
          Prudential Life Insurance Company of America.  Cornerstone Equity
          Investors, L.L.C. ("Cornerstone") is a Delaware limited liability
          company that advises PPEI III with respect to its ownership of stock
          of the Issuer.  In such capacity it has the power to control the
          voting and disposition of the shares of Common Stock.

Item 2(b).  Address of Principal Business Office:
- -------------------------------------------------

          PPEI III     8 Campus Drive
                       4th Floor, Arbor Circle South
                       Parsippany, NJ 07054

          Cornerstone  717 Fifth Avenue
                       New York, NY  10022


Item 2(c).  Citizenship:
- ------------------------

          PPEI III     New York

          Cornerstone  Delaware

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

          Class A Common Stock and Class B Common Stock.  See footnote 1.

Item 2(e).  CUSIP Number:
- -------------------------

          45985A 10 1 CLA

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


Item 4.  Ownership
- ------------------

     (a) Amount Beneficially Owned
          4,535,370 shares of Class A Common Stock (includes 2,509,425 shares of
          Class B Common Stock).  See footnote 1.
     (b) Percent of Class
          24.7%
<PAGE>
 
CUSIP NO. 45985A 10 1 CLA                                     PAGE 5 OF 6 PAGES


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

          (i)  sole power to vote or to direct the vote
                    4,535,370 shares of Class A Common Stock (includes 2,509,425
                    shares of Class B Common Stock). See footnote 1.
          (ii) shared power to vote or to direct the vote
                    -0-
          (iii)  sole power to dispose or to direct the disposition of
                    4,535,370 shares of Class A Common Stock (includes 2,509,425
                    shares of Class B Common Stock). See footnote 1.
          (iv) shared power to dispose or to direct the disposition of
                    -0-

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

          N/A

Item 6.  Ownership of More than Five Percent on Behalf of Another Person:
- ------------------------------------------------------------------------ 
 
          N/A

Item 7.  Identification and Classification of the Subsidiary which Acquired the
- -------------------------------------------------------------------------------
Security Being Reported on By the Parent Holding Company:
- -------------------------------------------------------- 

          N/A

Item 8.  Identification and Classification of Members of the Group:
- ------------------------------------------------------------------ 

          N/A

Item 9.  Notice of Dissolution of Group:
- ----------------------------------------

          N/A

Item 10.  Certification:
- ----------------------- 

          By signing below I certify that, to the best of my 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>
 
CUSIP NO. 45985A 10 1 CLA                                     PAGE 6 OF 6 PAGES



                                   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.



February 13, 1998                   Prudential Private Equity Investors III, 
                                    L.P.

                                    By:  Prudential Equity Investors, Inc.,
                                         its general partner


                                    By:/s/ Kevin C. Uebelien
                                       ------------------------------------
                                    Name:   Kevin C. Uebelien
                                    Title:  President


                                    Cornerstone Equity Investors, L.L.C.


                                    By:/s/ Mark Rossi
                                       ------------------------------------
                                    Name:   Mark Rossi
                                    Title:  Member


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