QUICKTURN DESIGN SYSTEMS INC
8-K/A, 1999-05-21
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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<PAGE>
 
================================================================================

                     SECURITIES AND EXCHANGE COMMISSION

                            Washington, DC 20549

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

                                 FORM 8-K/A

                               CURRENT REPORT

                   PURSUANT TO SECTION 13 OR 15(d) OF THE

                       SECURITIES EXCHANGE ACT OF 1934

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

                                        

Date of Report (Date of earliest event reported):    December 8, 1998



                        QUICKTURN DESIGN SYSTEMS, INC.

             (Exact Name of Registrant as Specified in  Charter)

<TABLE>
<S>                                  <C>                       <C>
         Delaware                        0-22738                     77-0159619
(State or Other Jurisdiction         (Commission File             (I.R.S. Employer
     of Incorporation )                  Number)               Identification Number)
</TABLE> 
 
                              55 W. Trimble Road
                          San Jose, California 95131
                   (Address of Principal Executive Offices)
                                  (Zip Code)


Registrant's telephone number, including area code:  (408) 914-6000

================================================================================
<PAGE>
 
Item 5.     Other Events.
- -------------------------

       On May 12, 1999, Quickturn Design Systems, Inc. ("Quickturn") and
Cadence Design Systems, Inc. ("Cadence") amended their Agreement and Plan of
Merger (the "Merger Agreement") dated as of December 8, 1998, as amended on
December 16, 1998 and January 4, 1999, to correct typographical errors.


Item 7.    Financial Statements, Pro Forma Financial Information and Exhibits.
- ------------------------------------------------------------------------------

(c)    Exhibits

       Exhibit No.               Description
       -----------               -----------

       Exhibit 2.1               Amendment No. 3 dated as of May 12, 1999, to
                                 Agreement and Plan of Merger, dated as of
                                 December 8, 1998, as amended on December 16,
                                 1998 and January 4, 1999, by and among the
                                 Registrant, CDSI Acquisition, Inc. and
                                 Cadence Design Systems, Inc.
<PAGE>
 
                                  SIGNATURES
                                        
     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

Dated as of May 19, 1999.

                                  QUICKTURN DESIGN SYSTEMS, INC. 

                                  By: /s/ RAYMOND K. OSTBY 
                                      ------------------------
                                      Raymond K. Ostby 
                                      Vice President, Finance and
                                         Administration, Chief Financial
                                         Officer and Secretary
<PAGE>
 
                                 EXHIBIT INDEX
<TABLE>
<CAPTION>
                                                                               Sequentially
                                                                                 Numbered
Exhibit No.                               Document                                 Page
- -----------     -----------------------------------------------------------   --------------
<S>             <C>                                                           <C>
Exhibit 2.1     Amendment No. 3 dated as of May 12, 1999, to Agreement and
                Plan of Merger, dated as of December 8, 1998, as amended on
                December 16, 1998 and January 4, 1999, by and among the
                Registrant, CDSI Acquisition, Inc. and Cadence Design
                Systems, Inc.
</TABLE>

<PAGE>
 
                                  EXHIBIT 2.1

                AMENDMENT NO. 3 TO AGREEMENT AND PLAN OF MERGER

          This AMENDMENT NO. 3 TO AGREEMENT AND PLAN OF MERGER (this
"Amendment"), dated as of May 12, 1999, is entered into by and among Quickturn
Design Systems, Inc., a Delaware corporation (the "Company"), Cadence Design
Systems, Inc., a Delaware corporation ("Parent"), and CDSI Acquisition, Inc., a
Delaware corporation and a wholly owned subsidiary of Parent ("Acquisition").
Capitalized terms used herein but not defined herein shall have the meanings set
forth in the Merger Agreement (defined below).

          WHEREAS, (i) the Company, Parent and Acquisition have previously
entered into that certain Agreement and Plan of Merger, dated as of December 8,
1998, as amended by Amendment No. 1 to Agreement and Plan of Merger, dated as of
December 16, 1998 and Amendment No. 2 to Agreement and Plan of Merger, dated as
of January 4, 1999 (the "Merger Agreement"), and (ii) the Company, Parent and
Acquisition have determined that it is advisable to amend the terms of the
Merger Agreement.

          NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, and intending to be legally bound
hereby, the Company, Parent and Acquisition hereby agree as follows:

                                   ARTICLE 1

                      AMENDMENTS TO THE MERGER AGREEMENT

          1.1.  Section 1.10(f) of the Merger Agreement is hereby amended and
restated to read in its entirety as follows:

          "(f)  No fraction of a share of Parent Common Stock shall be issued in
  the Merger but in lieu thereof each holder of Shares otherwise entitled to a
  fraction of a share of Parent Common Stock shall upon surrender of his or her
  Certificate or Certificates be entitled to receive an amount of cash (without
  interest) determined by multiplying the average closing price for Parent
  Common Stock as reported on the NYSE Composite Transactions reporting system
  for the five (5) business days immediately preceding the second business day
  prior to the Effective Time by the fractional share interest to which such
  holder would otherwise be entitled.  The parties acknowledge that payment of
  the cash consideration in lieu of issuing fractional shares was not separately
  bargained for consideration, but merely represents a mechanical rounding off
  for purposes of simplifying the corporate and accounting complexities that
  would otherwise be caused by the issuance of fractional shares."

<PAGE>
 
          1.2.  Section 5.2(e) of the Merger Agreement is hereby amended and
restated to read in its entirety as follows:

              "(e)  The Company shall have received the opinion of legal counsel
     to Parent as to the matters set forth in Exhibit D;"
                                              ---------  

          1.3.  Section 5.3(f) of the Merger Agreement is hereby amended and
restated to read in its entirety as follows:

              "(f)  Parent shall have received the opinion of legal counsel to 
     the Company as to the matters set forth in Exhibit C;"
                                                ---------  

                                   ARTICLE 2

                                 MISCELLANEOUS

          2.1.  Affirmation.  All terms of the Merger Agreement not expressly
                ------------                                                 
amended in this Amendment remain unmodified and in full force and effect.

          2.2.  Entire Agreement.  The Merger Agreement, as amended by this
                ----------------                                           
Amendment (including the Company Disclosure Schedule), constitutes the entire
agreement among the parties hereto with respect to the subject matter hereof and
supersedes all other prior agreements and understandings both written and oral
between the parties with respect to the subject matter hereof.

          2.3.  Validity.  If any provision of this Amendment or the Merger
                --------                                                   
Agreement, the application thereof to any person or circumstance is held invalid
or unenforceable, the remainder of this Amendment and the Merger Agreement and
the application of such provision to other persons or circumstances shall not be
affected thereby and to such end the provisions of this Amendment and the Merger
Agreement are agreed to be severable.

          2.4.  Governing Law.  This Amendment shall be governed by and
                -------------                                          
construed in accordance with the laws of the State of Delaware without regard to
the principles of conflicts of law thereof.

          2.5.  Descriptive Headings.  The descriptive headings herein are
                --------------------                                      
inserted for convenience of reference only and are not intended to be part of or
to affect the meaning or interpretation of this Amendment.

          2.6.  Personal Liability.  This Amendment shall not create or be
                ------------------                                        
deemed to create or permit any personal liability or obligation on the part of
any direct or indirect stockholder of the Company or Parent or Acquisition or
any officer, director, employee, agent, representative or investor of any party
hereto.
<PAGE>
 
          2.7.  Counterparts.  This Amendment may be executed in one or more
                ------------                                                
counterparts, each of which shall be deemed to be an original but all of which
shall constitute one and the same agreement.

                 (Remainder of page intentionally left blank)

<PAGE>
 
          IN WITNESS WHEREOF, each of the parties has caused this Amendment to
be duly executed on its behalf as of the day and year first above written.

                               CADENCE DESIGN SYSTEMS, INC.
 
                               By: /s/ R.L. Smith McKeithen
                                   -----------------------------------
                               Name:   R.L. Smith McKeithen
                               Title:  Senior Vice President and General Counsel


                               QUICKTURN DESIGN SYSTEMS, INC.
 
                               By: /s/ R.K. Ostby
                                   -----------------------------------
                               Name:   R.K. Ostby
                               Title:  Vice President


                               CDSI ACQUISITION, INC.
 
                               By: /s/ R.L. Smith McKeithen
                                   -----------------------------------
                               Name:   R.L. Smith McKeithen
                               Title:  Secretary




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