MENTOR GRAPHICS CORP
SC 14D1/A, 1998-12-09
COMPUTER INTEGRATED SYSTEMS DESIGN
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
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                                AMENDMENT NO. 30
                               TO SCHEDULE 14D-1
 
                             TENDER OFFER STATEMENT
     (PURSUANT TO SECTION 14(D)(1) OF THE SECURITIES EXCHANGE ACT OF 1934)
 
                         QUICKTURN DESIGN SYSTEMS, INC.
 
                           (Name of Subject Company)
 
                          MENTOR GRAPHICS CORPORATION
                                   MGZ CORP.
 
                                   (Bidders)
 
                    COMMON STOCK, PAR VALUE $.001 PER SHARE
 
                       (including the Associated Rights)
 
                         (Title of Class of Securities)
 
                                   74838E102
 
                     (CUSIP Number of Class of Securities)
 
                            ------------------------
 
                                WALDEN C. RHINES
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                          MENTOR GRAPHICS CORPORATION
                            8005 S.W. BOECKMAN ROAD
                         WILSONVILLE, OREGON 97070-7777
                                 (503) 685-1200
 
           (Name, Address and Telephone Number of Persons Authorized
          to Receive Notices and Communications on Behalf of Bidders)
 
                                    COPY TO:
 
         JOHN J. HUBER, ESQ.                   CHRISTOPHER L. KAUFMAN, ESQ.
           LATHAM & WATKINS                          LATHAM & WATKINS
    1001 PENNSYLVANIA AVENUE, N.W.                    75 WILLOW ROAD
         WASHINGTON, DC 20004                  MENLO PARK, CALIFORNIA 94025
            (202) 637-2200                            (650) 328-4600
 
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    MGZ Corp., a Delaware corporation ("Purchaser"), and Mentor Graphics
Corporation, an Oregon corporation ("Parent"), hereby amend and supplement their
Tender Offer Statement on Schedule 14D-1 filed on August 12, 1998 (the
"Statement"), as amended, with respect to the offer by Purchaser to purchase all
outstanding shares of Common Stock, par value $.001 per share, of Quickturn
Design Systems, Inc., a Delaware corporation, for a purchase price of $12.125
per share, net to the seller in cash, without interest thereon, as set forth in
this Amendment No. 30. Capitalized terms used herein and not defined have the
meanings ascribed to them in the Statement.
 
ITEM 10. ADDITIONAL INFORMATION.
 
    Item 10(f) of the Statement is hereby amended and supplemented by the
following:
 
    1. On December 9, 1998, Parent issued a press release, a copy of which is
attached hereto as Exhibit (a)(54) and is incorporated herein by reference.
 
ITEM 11. MATERIAL TO BE FILED AS EXHIBITS.
 
    (a)(54) Press Release dated December 9, 1998.
 
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                                   SIGNATURES
 
    After due 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.
 
<TABLE>
<S>                             <C>  <C>
Dated: December 9, 1998         MENTOR GRAPHICS CORPORATION
 
                                By:           /s/ GREGORY K. HINCKLEY
                                       --------------------------------------
                                Name  Gregory K. Hinckley
                                Title:  Executive Vice President, Chief Operating
                                      Officer and Chief Financial Officer
 
                                MGZ CORP.
 
                                By:           /s/ GREGORY K. HINCKLEY
                                       --------------------------------------
                                Name:  Gregory K. Hinckley
                                Title:  Secretary and Chief Financial Officer
</TABLE>
 
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                           MENTOR GRAPHICS ISSUES STATEMENT

WILSONVILLE, OREGON, DECEMBER 9, 1998 -- Mentor Graphics Corporation (Nasdaq:
MENT) today said that it is considering its options regarding the announcement
today by Quickturn Design Systems, Inc. (Nasdaq: QKTN) and Cadence Design
Systems, Inc. (NYSE: CDN).  Mentor said it would not have any further comment
until its review of the options has been completed.

Contacts: Anne M. Wagner                     Roy Winnick/Todd Fogarty
          Vice President, Marketing          Kekst and Company
          503/685-1462                       212/521-4800


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