<PAGE>
================================================================================
SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities
Exchange Act of 1934 (Amendment No. )
Filed by the Registrant [X]
Filed by a Party other than the Registrant [_]
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)
- --------------------------------------------------------------------------------
(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)(4) and 0-11.
(1) Title of each class of securities to which transaction applies:
-------------------------------------------------------------------------
(2) Aggregate number of securities to which transaction applies:
-------------------------------------------------------------------------
(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):
-------------------------------------------------------------------------
(4) Proposed maximum aggregate value of transaction:
-------------------------------------------------------------------------
(5) Total fee paid:
-------------------------------------------------------------------------
[_] 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.
(1) Amount Previously Paid:
-------------------------------------------------------------------------
(2) Form, Schedule or Registration Statement No.:
-------------------------------------------------------------------------
(3) Filing Party:
-------------------------------------------------------------------------
(4) Date Filed:
-------------------------------------------------------------------------
Notes:
<PAGE>
EXHIBIT 42
FOR IMMEDIATE RELEASE
Contacts:
QUICKTURN DESIGN SYSTEMS, INC. ABERNATHY MacGREGOR FRANK
Joan Powell Pauline Yoshihashi / Matt Sherman
Director, Marketing Communications (213) 630-6550 / (212) 371-5999
(408) 914-6701
[email protected]
QUICKTURN ISSUES RESPONSE TO DELAWARE CHANCERY COURT DECISION
SAN JOSE, CALIF. -- October 12, 1998 -- Quickturn Design Systems, Inc. (Nasdaq:
QKTN) announced today that the Delaware Chancery Court has determined that a
full trial will be necessary to consider the defenses raised by Quickturn to
Mentor Graphics Corporation's (Nasdaq: MENT) complaint regarding amendments to
certain provisions of Quickturn's Bylaws and its stockholder rights plan. The
trial is scheduled to begin on October 19, 1998. The Chancery Court reached
its decision after considering the importance of the issues raised to the
development of Delaware corporate law.
Quickturn issued the following statement:
"Quickturn looks forward to a full and fair hearing of these important
corporate governance issues. We believe the amendments to our Bylaws and
stockholder rights plan are designed to protect the interests of
Quickturn's stockholders. We believe that stockholders will benefit from a
careful deliberation on these issues and we are confident that the Court
will recognize the merits of our case."
Quickturn Design Systems, Inc. is the leading provider of verification products
and time-to-market engineering (TtME(TM)) services for the design of complex ICs
and electronic systems. The company's products are used worldwide by developers
of high-performance computing, multimedia, graphics and communications systems.
Quickturn is headquartered at 55 W. Trimble Road, San Jose, CA 95131-1013;
Telephone: 408/914-6000. For more information, visit the Quickturn Web site at
www.quickturn.com or send e-mail to [email protected].
# # #