MENTOR GRAPHICS CORP
SC 14D1/A, 1998-10-29
COMPUTER INTEGRATED SYSTEMS DESIGN
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
                                AMENDMENT NO. 18
                               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. 18. 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 October 29, 1998, Parent issued a press release, a copy of which is
attached hereto as Exhibit (a)(36) and is incorporated herein by reference.
 
ITEM 11. MATERIAL TO BE FILED AS EXHIBITS.
 
    (a)(36) Press Release dated October 29, 1998.
 
                                       2
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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: October 29, 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>
 
                                       3

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               MENTOR GRAPHICS SAYS SPECIAL MEETING OF QUICKTURN
               STOCKHOLDERS CONVENED AND ADJOURNED TO NOVEMBER 24

         -- QUICKTURN STOCKHOLDERS URGED TO TENDER SHARES ON OR BEFORE
                         OCTOBER 30 EXPIRATION DATE --

WILSONVILLE, OR, OCTOBER 29, 1998 -- Mentor Graphics Corporation (Nasdaq: 
MENT) announced that, pursuant to an agreement with Quickturn Design Systems, 
Inc. (Nasdaq: QKTN), the special meeting of Quickturn stockholders called by 
Mentor Graphics convened today and was immediately adjourned until November 
24, 1998 without conducting any substantive business.  The record date for 
the November 24, 1998 special meeting called by Mentor continues to be 
September 10, 1998.

As previously announced, the principal purpose of the special meeting is to 
vote on replacing the current members of the Quickturn Board of Directors 
with a slate of independent directors nominated by Mentor Graphics.  If the 
nominees are elected, Mentor Graphics expects that, subject to their 
fiduciary duties to all Quickturn stockholders, the new directors will take 
the steps necessary to facilitate the stockholders' ability to accept Mentor 
Graphics' $12.125 per share all-cash offer.  Quickturn continues to assert, 
nevertheless, that the special meeting date has been conditionally set for 
January 8, 1999, citing a bylaw that it purported to adopt after Mentor 
Graphics' offer commenced on August 12, 1998.

Dr. Walden C. Rhines, President and Chief Executive Officer of Mentor 
Graphics, said:  "We look forward to the November 24 special meeting, and in 
the meantime urge Quickturn stockholders to tender their shares before the 
expiration of Mentor's Offer at 12:00 Midnight, New York City time, on 
Friday, October 30, 1998, unless extended.  Tendering shares is the best way 
for Quickturn stockholders to send a message to the Quickturn Board of 
Directors to end their entrenchment tactics."

Separately, the trial in which Mentor Graphics challenged the validity of the 

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bylaw and poison pill amendments adopted by Quickturn after Mentor Graphics 
commenced its $12.125 per share all-cash offer on August 12, 1998, ended 
Wednesday afternoon in Delaware Court of Chancery.  Mentor Graphics expects 
that post-trial briefs from both sides will be completed by November 6, 1998, 
and a decision by the Court of Chancery is expected shortly thereafter.

Mentor Graphics' Offer to Purchase and ancillary documents are available on a 
Mentor Graphics World Wide Web site at http://www.mentorg.com/file.

The Dealer Manager for the Offer is Salomon Smith Barney.  The Information 
Agent for the Offer is MacKenzie Partners, Inc., which can be reached 
toll-free at 800-322-2885 or by collect call at 212-929-5500.

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


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