MENTOR GRAPHICS CORP
DFAN14A, 1998-09-28
COMPUTER INTEGRATED SYSTEMS DESIGN
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                            SCHEDULE 14A INFORMATION
 
                  Proxy Statement Pursuant to Section 14(a) of
            the Securities Exchange Act of 1934 (Amendment No.    )
 
    Filed by the Registrant / /
    Filed by a party other than the Registrant /X/
 
    Check the appropriate box:
    / /  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only (as permitted by Rule
         14a-6(e)(2))
    / /  Definitive Proxy Statement
    /X/  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Section 240.14a-11(c) or Section 
         240.14a-12
 
                         QUICKTURN DESIGN SYSTEMS, INC.
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)

                          MENTOR GRAPHICS CORPORATION
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  No fee required

/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1) 
     and 0-11

    (1) Title of each class of securities to which transaction applies:

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    (2) Aggregate number of securities to which transaction applies:

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    (3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
        filing fee is calculated and state how it was determined):

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    (5) Total fee paid:

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/ / Fee paid previously with preliminary materials.

/ / Check box if any part of the fee is offset as provided by Exchange Act Rule
    0-11(a)(2) and identify the filing for which the offsetting fee was paid
    previously. Identify the previous filing by registration statement number,
    or the Form or Schedule and the date of its filing.

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<PAGE>
                       [MENTOR GRAPHICS CORPORATION LOGO]
 
                                                              September 28, 1998
 
Dear Quickturn Stockholder:
 
    This week you have an important opportunity to send the Quickturn Board of
Directors a message to stop its entrenchment tactics and wasteful litigation,
which are designed to block Mentor Graphics' all cash, premium offer. Tell them
to act in your best interests -- not theirs.
 
              TENDER YOUR SHARES PRIOR TO OCTOBER 6, 1998 -- SEND YOUR
                             MESSAGE LOUD AND CLEAR
 
    Act today. Mentor Graphics' $12.125 per share offer is scheduled to expire
at 12:00 Midnight, New York City time, on Tuesday, October 6, 1998, unless
extended.
 
    Despite our repeated efforts to negotiate with Quickturn's Board and
management since the commencement of our offer six weeks ago on August 12, 1998,
they have refused to meet.
 
    Instead, Quickturn's Board and management have engaged in stonewalling and
entrenchment tactics. If successful, these roadblocks, including amending
Quickturn's deadhand poison pill, will prevent all Quickturn stockholders for a
period of at least 270 days -- at least nine months -- from accepting an offer
that we believe you should be able to accept today. We believe that you'll find
that Quickturn's entrenchment efforts are against your best interests, as
discussed in the enclosed letter we sent to the Quickturn Board on Friday,
September 25.
 
    Furthermore, we believe that Quickturn management's business plan and their
portrayal of Quickturn's future prospects as an independent company are
doubtful. Remember that this is the same management that has repeatedly failed
to meet securities analysts' expectations in the past. Weigh their past
performance against our all-cash, fully financed premium $12.125 per share
offer. Keep in mind the $7.00 to $8.00 per share range in which Quickturn's
stock traded during the weeks immediately preceding the announcement of our
offer.
 
               IN THE PRESENT TURBULENT STOCK MARKET, OUR 50% PREMIUM
                 OFFER IS MORE ATTRACTIVE NOW THAN EVER BEFORE
 
    We stand ready to negotiate, and we would be willing to consider increasing
our offer to reflect even greater value if justified by our due diligence
review.
<PAGE>
    In early September, a significant number of Quickturn stockholders clearly
demonstrated to the Quickturn Board their preference for Mentor Graphics' offer
by tendering their shares. More than 7,046,297 shares were tendered, which when
added to the shares already owned by Mentor Graphics represent nearly 43% of
Quickturn's outstanding common stock.
 
               JOIN YOUR FELLOW STOCKHOLDERS WHO HAVE ALREADY SENT A
           CLEAR MESSAGE OF SUPPORT FOR MENTOR GRAPHICS' OFFER -- ADD
           YOUR VOICE BY TENDERING YOUR SHARES PRIOR TO OCTOBER 6 AND
                     BY VOTING MENTOR GRAPHICS' GOLD PROXY.
 
    If you have any questions or need assistance in tendering your shares or
voting Mentor Graphics' GOLD proxy, please call MacKenzie Partners, Inc., which
can be reached at 800-322-2885 Toll-Free or at 212-929-5500 (Collect).
 
                                           Sincerely,
 
                                           /s/ WALDEN C. RHINES
                                           Walden C. Rhines
                                           President and Chief Executive Officer
 
                               TENDER YOUR SHARES
                           VOTE THE GOLD PROXY TODAY
 
                        [MACKENZIE PARTNERS, INC. LOGO]
 
                                156 Fifth Avenue
                            New York, New York 10010
           CALL TOLL-FREE (800) 322-2885 OR (212) 929-5500 (COLLECT)
 
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