SYNOPSYS INC
S-3, 1998-11-25
PREPACKAGED SOFTWARE
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<PAGE>   1
 
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON NOVEMBER 25, 1998
 
                                            REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
 
                                 SYNOPSYS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                             <C>                                              <C>
           DELAWARE                        700 EAST MIDDLEFIELD ROAD                       56-1546236
(STATE OR OTHER JURISDICTION OF         MOUNTAIN VIEW, CALIFORNIA 94043                   (IRS EMPLOYER
INCORPORATION OR ORGANIZATION)                   (650) 962-5000                      IDENTIFICATION NUMBER)
                                  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE
                                                    NUMBER,
                                 INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL
                                               EXECUTIVE OFFICES)
</TABLE>
 
                                AART J. DE GEUS
                            CHIEF EXECUTIVE OFFICER
                                 SYNOPSYS, INC.
                           700 EAST MIDDLEFIELD ROAD
                        MOUNTAIN VIEW, CALIFORNIA 94043
                                 (650) 962-5000
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
 
                                   COPIES TO:
 
                           THOMAS C. DEFILIPPS, ESQ.
                        WILSON SONSINI GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                          PALO ALTO, CALIFORNIA 94304
                                 (650) 493-9300
                            ------------------------
 
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after the effective date of this Registration Statement.
 
     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]
 
     If any of the securities being registered on this form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  [X]
 
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  [ ]
 
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
 
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
 
                        CALCULATION OF REGISTRATION FEE
 
<TABLE>
<S>                             <C>                   <C>                   <C>                   <C>
- ----------------------------------------------------------------------------------------------------------------------
                                                            PROPOSED              PROPOSED
TITLE OF EACH CLASS                    AMOUNT               MAXIMUM               MAXIMUM
OF SECURITIES                          TO BE             OFFERING PRICE          AGGREGATE             AMOUNT OF
TO BE REGISTERED                     REGISTERED           PER SHARE(1)       OFFERING PRICE(1)      REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------------
Common Stock, $0.01 par value      638,462 shares           $49.5625           $31,643,772.88          $8,796.97
- ----------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Estimated solely for the purpose of computing the amount of the registration
    fee pursuant to Rule 457(c) under the Securities Act of 1933, as amended,
    based on the average of the high and low sales prices as reported on the
    Nasdaq National Market on November 24, 1998.
 
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE SEC, ACTING PURSUANT TO SAID SECTION 8(a), MAY
DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
                 SUBJECT TO COMPLETION, DATED NOVEMBER 25, 1998
 
PROSPECTUS
 
Synopsys, Inc.
700 East Middlefield Road
Mountain View, California 94043
Telephone Number: (650) 962-5000
 
                                 638,462 SHARES
 
                                      LOGO
 
                                  COMMON STOCK
 
                            ------------------------
 
     These shares may be offered and sold from time to time by certain
stockholders of the Company identified in this prospectus. See "Selling
Stockholders." The selling stockholders acquired the shares on November 20, 1998
in connection with the acquisition by Synopsys, Inc. ("Synopsys") of Everest
Design Automation Inc. ("Everest") pursuant to that certain Agreement of Merger
and Plan of Reorganization by and among Synopsys, Tenzing Acquisition
Corporation, a Delaware corporation and a wholly-owned subsidiary of Synopsys,
and Everest, dated as of October 26, 1998 (the "Merger Agreement").
 
     The selling stockholders will receive all of the net proceeds from the sale
of the shares. These stockholders will pay all underwriting discounts and
selling commissions, if any, applicable to the sale of the shares. The Company
will not receive any proceeds from the sale of the shares.
 
     YOU SHOULD CONSIDER CAREFULLY THE RISK FACTORS BEGINNING ON PAGE 3 OF THIS
PROSPECTUS BEFORE PURCHASING ANY OF THE COMMON STOCK OFFERED HEREBY.
 
     Synopsys's common stock is quoted on the Nasdaq National Market under the
symbol "SNPS." On November 24, 1998, the last reported sale price of the common
stock was $49.3125 per share.
 
                            ------------------------
 
     The Securities and Exchange Commission and state securities regulators have
not approved or disapproved these securities, or determined if this prospectus
is truthful or complete. Any representation to the contrary is a criminal
offense.
 
                            ------------------------
 
                               November   , 1998
<PAGE>   3
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Forward Looking Information.................................    2
Synopsys, Inc...............................................    3
Risk Factors................................................    3
Where to Find More Information about Synopsys...............    7
Information Incorporated by Reference.......................    7
Use of Proceeds.............................................    8
Selling Stockholders........................................    9
Plan of Distribution........................................   10
Legal Matters...............................................   11
Experts.....................................................   11
</TABLE>
 
     You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information different from that
contained in this prospectus. The selling stockholders are offering to sell, and
seeking offers to buy, shares of Synopsys common stock only in jurisdictions
where offers and sales are permitted. The information contained in this
prospectus is accurate only as of the date of this prospectus, regardless of the
time of delivery of this prospectus or of any sale of the shares.
 
     In this prospectus, unless indicated otherwise, "Synopsys," the "Company,"
"we," "us," and "our" refer to Synopsys, Inc. and its subsidiaries.
 
                          FORWARD LOOKING INFORMATION
 
     This prospectus, including the information incorporated by reference
herein, contains forward-looking statements within the meaning of Section 27A of
the Securities Act of 1933, as amended (the "Securities Act"), and Section 21E
of the Exchange Act. Our actual results could differ materially from those
projected in the forward-looking statements as a result of the risk factors set
forth below. In particular, please review the sections captioned "Management's
Discussion and Analysis of Financial Condition and Results of Operations" in our
annual report on Form 10-K for the fiscal year ended September 30, 1997, and our
quarterly reports on Form 10-Q for the quarters ended July 4, 1998, April 4,
1998 and January 3, 1998, which reports are incorporated herein by reference and
such section of any subsequently filed Exchange Act reports. In connection with
forward-looking statements which appear in these disclosures, prospective
purchasers of the shares offered hereby should carefully consider the factors
set forth in this prospectus under "Risk Factors."
 
                                        2
<PAGE>   4
 
                                 SYNOPSYS, INC.
 
     Synopsys develops, markets, and supports electronic design automation
("EDA") products for designers of integrated circuits ("ICs") and electronic
systems. Synopsys offers a range of design tools, verification tools and
systems, design reuse products and physical design tools that significantly
improve designers' productivity by offering improved time to market, reduced
development and manufacturing costs, and enhanced design quality of results when
compared to earlier generations of EDA products. Synopsys also provides
training, support and consulting services for its customers.
 
                                  RISK FACTORS
 
     You should carefully consider the risks described below before making an
investment decision. The risks and uncertainties described below are not the
only ones facing our company. Additional risks and uncertainties not presently
known to us or that we currently deem immaterial may also impair our business
operations.
 
     If any of the following risks actually occur, our business, financial
condition, or results of operations could be materially adversely affected. In
such case, the trading price of our common stock could decline and you may lose
all or part of your investment.
 
     This prospectus contains forward-looking statements that involve risks and
uncertainties. Our actual results could differ materially from those anticipated
in such forward-looking statements as a result of a variety of factors,
including those set forth in the following risk factors and elsewhere in, or
incorporated by reference into, this prospectus. In evaluating an investment in
the shares you should consider carefully the following risk factors in addition
to the other information presented in this prospectus or incorporated by
reference into this prospectus.
 
POTENTIAL EARNINGS FLUCTUATIONS
 
     We attempt to plan our business to achieve quarter-to-quarter revenue and
earnings growth. Achieving predictable revenue and earnings growth is difficult.
Quarterly revenue and earnings are affected by many factors, including customer
product demand, product license terms, the size of our backlog, and the timing
of revenue recognition on products and services sold. The following factors
could affect our revenues and earnings per share in a particular quarter or over
several quarterly or annual periods:
 
     - Our orders are seasonal. Historically, our first fiscal quarter ending
       December 31 is our weakest, and may have a book-to-bill ratio below one.
 
     - Our products are complex, and before buying them potential customers
       spend a great deal of time reviewing and testing them. This is
       particularly true if they are new customers or current customers
       purchasing a new product or switching from a competitor's product. The
       sales cycle does not necessarily match quarterly periods, and if by the
       end of any quarter our sales force has not sold enough new licenses, our
       orders and revenues could be substantially reduced.
 
     - Like many companies in the software industry, we receive a
       disproportionate volume of orders in the last week of a quarter, and
       recognize a disproportionate amount of revenue in the last week of a
       quarter. In addition, the proportion of our business attributable to our
       largest customers is increasing. As a result, if any order, and
       especially a large order, is delayed beyond the end of a fiscal period,
       our orders and revenue for that period could be substantially reduced.
 
     - The accounting rules we are required to follow only permit us to
       recognize revenue when certain criteria are met. Orders for certain of
       the Company's products and services, including certain time-based product
       licenses, consulting services, and software support, yield revenue (or a
       significant portion thereof) over multiple quarters (often extending
       beyond the current fiscal year) or upon completion of performance rather
       than at the time of sale. In addition, in negotiating a purchase order
       with a customer, we may agree to terms that have the effect of requiring
       deferral of revenue in whole or in part. As a result, it may be difficult
       for us to convert orders, particularly those received late in a quarter,
 
                                        3
<PAGE>   5
 
       or backlog, to revenue in any given quarter. It is therefore possible for
       the Company to fall short in its revenue and/or earnings plan for a given
       quarter even while orders and backlog remain on plan.
 
COMPETITION
 
     The EDA industry is highly competitive. We compete against other EDA
vendors, and with customers' internally developed design tools and internal
design capabilities, for a share of the overall EDA budgets of our customers.
Our competitors include companies that offer a broad range of products and
services, such as Cadence Design Systems, Inc. ("Cadence"), Mentor Graphics,
Inc. ("Mentor") and Avant! Corporation ("Avant!"), as well as companies,
including numerous start-up companies, that offer products focused on a discrete
phase of the integrated circuit ("IC") design process. In order to remain
successful against such competition, we must continue to enhance our current
products and bring to market new products that address the increasingly
sophisticated needs of our customers on a timely and cost-effective basis. We
also will have to expand our ability to offer consulting services. The failure
to enhance existing products, develop and/or acquire new products or to expand
our ability to offer such services would have a material adverse effect on our
business, financial condition and results of operations.
 
     Technology advances and customer requirements are fueling a change in the
nature of competition among EDA vendors. Increasingly, EDA companies compete on
the basis of "design flows" involving a broad range of products (including both
logic and physical design tools) and services rather than on the basis of
individual "point" tools performing a discrete phase of the design process. No
single EDA company currently offers its customers industry-leading products in a
complete design flow. We offer a wide range of logic design tools but currently
offer a relatively limited range of physical design tools. In November 1998 we
acquired Everest, a private company developing physical design software. We will
need to develop or acquire additional physical design tools in order to offer a
complete design flow. We are also attempting to expand our capacity to offer
professional services, but for the foreseeable future will continue to have less
capacity than Cadence to provide such services. The market for physical design
tools is dominated by Cadence and Avant!, both of which are attempting to
complete their design flows. Cadence recently acquired Ambit Design Systems, a
private company offering synthesis and other logic design products, as well as
certain physical design verification products from Lucent Technologies, both of
which will increase the direct competition between Synopsys and Cadence. In
addition, Cadence's acquisition of logic design products may lead to reductions
in purchases of our logic design software by Cadence, which was one of Synopsys'
ten largest customers in fiscal 1998. Avant! also recently acquired a private
company offering logic synthesis software, which will increase the direct
competition between Synopsys and Avant!.
 
SUCCESS OF NON-SYNTHESIS PRODUCTS
 
     Historically, much of the Company's growth has been attributable to the
strength of its logic synthesis products. Opportunities for growth in market
share in this area are limited, and synthesis revenues are expected to grow more
slowly than our target for overall revenue growth. Synthesis and related "design
creation" products account for approximately 45-50% of our revenue. As a result,
in order to meet our revenue plan, non-synthesis design creation products, high
level verification products and deep submicron products and our services
business will have to grow faster than our overall revenue growth target.
 
     Our PrimeTime timing analysis, Formality formal verification, Module
Compiler datapath synthesis and VCS Verilog simulation products are expected to
be among the most important contributors to product revenue growth. These
products have achieved initial customer acceptance, but we will only derive
significant revenue from these products if they are accepted by a broad range of
customers. Product success is difficult to predict. The introduction of new
products and growth of a market for such products cannot be assured in a highly
competitive environment like EDA. In the past we, like all companies, have had
products that despite initial successes, have failed to meet our revenue
expectations. Expanding our capacity to offer consulting services and our
revenues derived therefrom will require us to recruit, hire and train a large
number of talented people, and to implement management controls on bidding and
executing on services engagements. The consulting business is significantly
different than the software business, however, and as indicated by recent
layoffs announced by Cadence in its service business, increasing consulting
orders and revenue while
 
                                        4
<PAGE>   6
 
maintaining an adequate level of profit can be difficult. There can be no
assurance that the Company will be successful in expanding revenues from
existing or new products at the desired rate or expanding its services business,
and the failure to do so would have a material adverse effect on the Company's
business, financial condition and results of operations.
 
INTEGRATION OF ACQUIRED BUSINESSES
 
     We have acquired or merged with a number of companies in recent years,
including EPIC Design Technology, Inc., Viewlogic Systems, Inc., Systems Science
Inc. and Everest, and as part of our efforts to expand our product and services
offerings we may acquire additional companies in the future. In addition to
direct costs, acquisitions pose a number of risks, including potential dilution
of earnings per share, problems of integrating the acquired products and
employees into our business, the failure to realize expected synergies or cost
savings, the drain on management time for acquisition-related activities,
possible adverse effects on customer buying patterns due to uncertainties
resulting from an acquisition, and assumption of unknown liabilities. While we
attempt to review proposed acquisitions carefully and negotiate terms that are
favorable to the Company, there is no assurance that any individual acquisition
will have the projected effect on the Company's performance.
 
DEPENDENCE ON SEMICONDUCTOR AND ELECTRONICS BUSINESSES
 
     Our business has benefited from the rapid worldwide growth of the
semiconductor industry. Purchases of our products are largely dependent upon the
commencement of new design projects by semiconductor manufacturers and their
customers. The outlook for the semiconductor industry for the remainder of
calendar year 1998 and 1999 is uncertain, owing in part to adverse economic
conditions in Asia and to potential slowing of growth in the United States. A
number of the Company's customers have announced layoffs of their employees or
the suspension of investment plans, and although the Company has not seen a
significant drop-off in demand from these customers, their EDA budgets could be
reduced, alone or as part of overall expense control efforts. In addition, there
have been a number of mergers in the semiconductor and systems industries, which
may reduce the aggregate level of purchases of our products and services by the
merged companies. Slower growth in the semiconductor and systems industries, a
reduced number of design starts, tightening of customers' operating budgets or
continued consolidation among the Company's customers may have a material
adverse effect on our business, financial condition and results of operations.
 
INTERNATIONAL EXPOSURE
 
     In fiscal 1998, international revenue accounted for 39% of our revenue,
after accounting for 42% and 44% of our revenue in fiscal 1997 and 1996,
respectively. We expect that international revenue will continue to account for
a significant portion of our revenue in the future. As a result, the Company's
performance may be negatively affected by changes in foreign currency exchange
rates and changes in regional or worldwide economic or political conditions. In
particular:
 
     - Revenue from sales in Japan during fiscal 1998 was adversely affected by
       the weakness of the yen against the dollar, overall weakness in the
       Japanese economy and the deferral of investments in semiconductor
       facilities and technology by Japanese companies. Continued weakness of
       the Japanese economy during fiscal 1999 is likely to adversely affect
       revenue from Japan during the year. The yen has recently strengthened,
       but the exchange rate for fiscal 1999 remains subject to unpredictable
       fluctuations. Renewed weakness of the yen could adversely affect revenue
       from Japan during fiscal 1999.
 
     - Significant declines in the value of the Korean won during fiscal 1998,
       and the subsequent economic crisis had a significant adverse affect on
       our business in Korea during the year, and is likely to continue to
       affect our orders and revenue from Korea in fiscal 1999. Declines in the
       currencies of other countries in the Asia Pacific region, particularly
       Taiwan, have also negatively affected the Company's sales in the region.
       Continued instability in Asian currency markets and weaknesses in Asian
       economies would continue to have an adverse effect on our orders and
       revenues from the Asia Pacific region.
 
                                        5
<PAGE>   7
 
RISKS OF JOINT DEVELOPMENT
 
     In February 1996, we entered into a six-year joint development and license
agreement with IBM, pursuant to which the two companies agreed to develop
certain new products. Joint development of products is subject to risks and
uncertainties over and above those affecting internal development. During fiscal
year 1997, the first joint product resulting from the alliance, PrimeTime, was
introduced, and the parties agreed to terminate efforts to develop a product in
one of the product areas covered by the agreement. A second joint product is
expected to be introduced in January 1999, and development of the fourth product
to be developed under the agreement has been suspended. Synopsys and IBM are
currently discussing the future of the alliance. There can be no assurance that
joint development will continue, or that the products developed by the alliance
will be successful.
 
NEED TO RECRUIT AND RETAIN KEY PERSONNEL
 
     Our success is dependent on technical and other contributions of key
employees. We participate in a dynamic industry, with significant start-up
activity, and our headquarters is in Silicon Valley, where skilled technical,
sales and management employees are in high demand. There is a limited number of
qualified EDA engineers, and the competition for such individuals is intense.
Experience at Synopsys is highly valued in the EDA industry, and our employees
are recruited aggressively by our competitors and by start-up companies. Our
salaries are competitive in the market, but under certain circumstances,
start-up companies can offer more attractive stock option packages. As a result,
we have experienced, and may continue to experience, significant employee
turnover. In addition, there can be no assurance that we can continue to recruit
and retain key personnel. Failure to successfully recruit and retain such
personnel could have a material adverse effect on our business, financial
condition and results of operations.
 
POISON PILL PROVISIONS
 
     The Company has adopted a number of provisions that could have
anti-takeover effects. The Board of Directors has adopted a Preferred Shares
Rights Plan, commonly referred to as a "poison pill." In addition, the Board of
Directors has the authority, without further action by its stockholders, to fix
the rights and preferences of, and issue shares of, authorized but undesignated
shares of Preferred Stock. This provision and other provisions of the Company's
Restated Certificate of Incorporation and Bylaws and the Delaware General
Corporation Law may have the effect of deterring hostile takeovers or delaying
or preventing changes in control or management of the Company, including
transactions in which the stockholders of the Company might otherwise receive a
premium for their shares over then current market prices.
 
YEAR 2000
 
     Synopsys presently believes that we will not experience significant
operational problems arising from the Year 2000 problem (i.e., the inability of
certain computer programs to correctly process date information on or after
January 1, 2000). However, if unforeseen Year 2000 issues arise with respect to
Synopsys products, one or more important customers experiences Year 2000-related
problems that interferes with their purchases of Synopsys products, or we are
not able to identify and fix Year 2000 problems relating to the computer systems
and software we rely on to run our business, we may experience a disruption in
our business, which could have a material adverse impact on our business,
financial condition and results of operations.
 
CHANGES IN FINANCIAL ACCOUNTING STANDARDS
 
     We prepare our financial statements in conformity with generally accepted
accounting principles ("GAAP"). GAAP are subject to interpretation by the
American Institute of Certified Public Accountants ("AICPA"), the Securities and
Exchange Commission ("SEC") and various bodies formed to interpret and create
appropriate accounting policies. A change in these policies can have a
significant effect on our reported results, and may even affect our reporting of
transactions completed before a change is announced. Accounting policies
affecting many other aspects of our business, including rules relating to
software revenue recognition, purchase and pooling-of-interests accounting for
business combinations, employee stock purchase plans and
 
                                        6
<PAGE>   8
 
stock option grants have recently been revised or are under review by one or
more groups. Changes to these rules, or the questioning of current practices,
may have a significant adverse affect on our reported financial results or in
the way we conduct our business.
 
     In addition, the preparation of financial statements in conformity with
GAAP requires us to make estimates and assumptions that affect the recorded
amounts of assets and liabilities, disclosure of those assets and liabilities at
the date of the financial statements and the recorded amounts of expenses during
the reporting period. A change in the facts and circumstances surrounding these
estimates could result in a change to the estimates and impact future operating
results.
 
                 WHERE TO FIND MORE INFORMATION ABOUT SYNOPSYS
 
     We file annual, quarterly and special reports, proxy statements, and other
information with the SEC. You may read and copy any document we file at the
SEC's public reference rooms in Washington, D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public reference rooms. Our SEC filings are also available to the public
from our web site at http://www.synopsys.com or at the SEC's web site at
http://www.sec.gov.
 
                     INFORMATION INCORPORATED BY REFERENCE
 
     The SEC allows us to "incorporate by reference" the information we file
with them, which means that we can disclose important information to you by
referring you to those documents that we have previously filed with the SEC or
documents that we will file with the SEC in the future. The information
incorporated by reference is considered to be part of this prospectus, and later
information that we file with the SEC will automatically update and supersede
this information. We incorporate by reference the documents listed below, and
any future filings made with the SEC under Sections 13(a), 13(c), 14 or 15(d) of
the Exchange Act of 1934 (the "Exchange Act"), until the selling stockholders
sell all the shares. This prospectus is part of a Registration Statement we
filed with the SEC (Registration No. 333-               ). The documents we
incorporate by reference are:
 
     1. Synopsys's Annual Report on Form 10-K for the fiscal year ended
        September 30, 1997;
 
     2. Synopsys's Quarterly Report on Form 10-Q for the quarter ended July 4,
        1998;
 
     3. Synopsys's Quarterly Report on Form 10-Q for the quarter ended April 4,
        1998;
 
     4. Synopsys's Quarterly Report on Form 10-Q for the quarter ended January
        3, 1998;
 
     5. Synopsys's Current Report on Form 8-K dated November 16, 1998 relating
        to fourth quarter results;
 
     6. Synopsys's Current Report on Form 8-K dated December 19, 1997 relating
        to the acquisition of Viewlogic Systems, Inc.;
 
     7. The description of Synopsys's common stock contained in its Registration
        Statement on Form 8-A as filed on January 24, 1992.
 
     We also incorporate by reference all documents subsequently filed by the
Company pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act,
prior to the filing of a post-effective amendment which indicates that all
securities registered have been sold or which deregisters all securities then
remaining unsold.
 
     Any statement contained in a document incorporated or deemed to be
incorporated by reference in this Registration Statement or Prospectus shall be
deemed to be modified or superseded for purposes of the Registration Statement
or this Prospectus to the extent that a statement contained herein, in a
Prospectus Supplement or in any other document subsequently filed with the
Commission which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of the Registration Statement or this Prospectus.
 
                                        7
<PAGE>   9
 
     You may request a copy of these filings, at no cost, by writing or
telephoning us at the following address: Synopsys, Inc., 700 East Middlefield
Road, Mountain Veiw, California 94043; telephone number (650) 962-5000.
 
                                USE OF PROCEEDS
 
     The Company will not receive any proceeds from the sale of the shares by
the selling stockholders.
 
                                        8
<PAGE>   10
 
                              SELLING STOCKHOLDERS
 
     The following table sets forth certain information regarding the beneficial
ownership of the Company's common stock by each selling stockholder. All
information contained in the table below is based on beneficial ownership as of
November 20, 1998. Unless otherwise noted, none of the selling stockholders has
held any position or office or had a material relationship with the Company or
any of its affiliates within the past three years other than as a result of the
ownership of the Company's common stock.
 
<TABLE>
<CAPTION>
                                              BENEFICIAL OWNERSHIP                 BENEFICIAL OWNERSHIP
                                              PRIOR TO OFFERING(2)    NUMBER OF      AFTER OFFERING(2)
                                              --------------------     SHARES      ---------------------
          SELLING STOCKHOLDERS(1)              NUMBER     PERCENT      OFFERED      NUMBER      PERCENT
          -----------------------             --------    --------    ---------    --------    ---------
<S>                                           <C>         <C>         <C>          <C>         <C>
Anthelion Capital, LLC......................   64,865         *         58,379       6,486         *
Bernard Aronson.............................    2,179         *          1,962         217         *
Andy Bechtolsheim...........................  250,878         *        225,791      25,087         *
Frederick W. W. Bolander....................      727         *            655          72         *
Brobeck, Phleger & Harrison, LLP............      364         *            328          36         *
Chemicals and Materials Enterprise
  Associates L.P. II........................   54,467         *         49,021       5,446         *
Robert T. Coneybeer.........................      745         *            671          74         *
Vinod K. Dham...............................    2,206         *          1,986         220         *
Goel Family Partnership.....................   36,312         *         32,681       3,631         *
Hemraj Hingarh..............................    1,816         *          1,635         181         *
Kurt Keutzer................................    5,447         *          4,903         544         *
Warren T. Lazarow(3)........................      218         *            197         184         *
Mezzamie Group..............................      727         *            655          72         *
NEA Presidents Fund, L.P....................    3,268         *          2,942         326         *
NEA Ventures 1998, Limited Partnership......      364         *            328          36         *
New Enterprise Associates VII, Limited
  Partnership...............................  163,400         *        147,060      16,340         *
Raj-Dak Investments.........................   71,809         *         64,629       7,180         *
Valerie and Michael Russell.................      146         *            132          14         *
Saiyed Atiq Raza and Noreen Tirmizi Raza,
  Trustees N & A Raza Revocable Trust UA
  3/22/97...................................    7,263         *          6,537         726         *
J. Phillip Samper...........................      727         *            655          72         *
Sang S. Wang and Janet S. Wang, Trustees of
  the Wang Living Trust U/T/D 10/4/96.......    2,451         *          2,206         245         *
John Sanguinetti............................      727         *            655          72         *
Scott Seiden................................    1,308         *          1,178         130         *
Chester Silvestri...........................   29,710         *         26,739       2,971         *
Rajvir Singh................................    7,263         *          6,537         726         *
</TABLE>
 
- ---------------
 *  Less than 1%.
 
(1) The selling stockholders acquired the shares in connection with the
    acquisition by Synopsys of Everest Design Automation Inc. (the "Everest
    Acquisition"). All of the shares offered hereby are being offered by the
    selling stockholders. Pursuant to the terms of the Registration Rights
    Agreement, dated as of October 26, 1998, which was made in connection with
    the Everest Acquisition (the "Registration Rights Agreement"), the Company
    undertook to use its best efforts to effect the registration of the shares
    issued to the selling stockholders. The Registration Rights Agreement also
    includes certain indemnification arrangements with the selling stockholders.
    The number of shares beneficially owned by the selling stockholders includes
    an aggregate of 72,232 shares of common stock that have been deposited in
    escrow pursuant to the terms of the merger agreement governing the Everest
    Acquisition to secure the respective
 
                                        9
<PAGE>   11
 
    indemnification obligations of the selling stockholders thereunder (the
    "Escrowed Shares"). The Escrowed Shares will be released from escrow on
    October 25, 1999 to the extent that no claims have been made against the
    Escrowed Shares.
 
(2) Applicable percentage ownership is based on 68,305,179 shares of common
    stock outstanding as of August 8, 1998, adjusted to reflect the issuance of
    a total of 1,503,758 shares in connection with the Everest Acquisition.
    Beneficial ownership is determined in accordance with the rules of the SEC
    and generally includes voting or investment power with respect to
    securities, subject to community property laws, where applicable. Shares of
    common stock subject to options that are presently exercisable or
    exercisable within 60 days of November 20, 1998 are deemed to be
    beneficially owned by the person holding such options for the purpose of
    computing the percentage of ownership of such person but are not treated as
    outstanding for the purpose of computing the percentage of any other person.
    To the extent that any shares are issued upon exercise of options, warrants
    or other rights to acquire the Company's capital stock that are presently
    outstanding or granted in the future or reserved for future issuance under
    the Company's stock plans, there will be further dilution to new public
    investors.
 
(3) Mr. Lazarow is the beneficial owner of a total of 184 shares of common stock
    deposited in the escrow account, of which 163 shares are escrowed in
    connection with shares of common stock issued to Mr. Lazarow pursuant to
    Everest's 1997 Stock Option/Stock Issuance Plan.
 
                              PLAN OF DISTRIBUTION
 
     The shares covered by this prospectus may be offered and sold from time to
time by the selling stockholders. Such sales may be made on the Nasdaq National
Market, in the over-the-counter market or otherwise, at prices and under terms
then prevailing or at prices related to the then current market price, or in
negotiated transactions. The shares may be sold by means of one or more of the
following: (a) a block trade in which the broker-dealer so engaged will attempt
to sell the shares as agent, but may position and resell a portion of the block
as principal to facilitate the transaction; (b) purchases by a broker-dealer as
principal and resale by such broker-dealer for its account pursuant to this
prospectus; (c) an over-the-counter distribution in accordance with the rules of
the Nasdaq National Market; (d) ordinary brokerage transactions in which the
broker solicits purchasers; and (e) privately negotiated transactions. In
effecting sales, broker-dealers engaged by the selling stockholders may arrange
for other broker-dealers engaged by the selling stockholders may arrange for
other broker-dealers to participate in resales.
 
     In connection with distributions of the shares or otherwise, the selling
stockholders may enter into hedging transactions with broker-dealers. In
connection with such transactions, broker-dealers may engage in short sales of
the shares registered hereunder in the course of hedging the positions they
assume with the selling stockholders. The selling stockholders may also sell the
shares short and redeliver the shares to close out such short positions. The
selling stockholders may also enter into option or other transactions with
broker-dealers which require the delivery to the broker-dealer of the shares
registered hereunder, which the broker-dealer may resell or otherwise transfer
pursuant to this prospectus. The selling stockholders may also loan or pledge
shares registered hereunder to a broker-dealer, and the broker-dealer may sell
the shares so loaned or upon a default the broker-dealer may effect sales of the
pledged shares pursuant to this prospectus.
 
     Broker-dealers or agents may receive compensation in the form of
commissions, discounts or concessions from the selling stockholders in amounts
to be negotiated in connection with the sale. Such broker-dealers and any other
participating broker-dealers may be deemed to be "underwriters" within the
meaning of the Securities Act, in connection with such sales and any such
commission, discount or concession may be deemed to be underwriting discounts or
commissions under the Securities Act.
 
     The Company has advised the selling stockholders that the anti-manipulation
rules under the Exchange Act may apply to sales of shares in the market and to
the activities of the selling stockholders and their affiliates. In addition,
the Company will make copies of this prospectus available to the selling
stockholders and has informed them of the need for delivery of copies of this
prospectus to purchasers at or prior to the time of any sale of the shares
offered hereby.
 
                                       10
<PAGE>   12
 
     All costs, expenses and fees in connection with the registration of the
shares will be borne by the Company. Commissions and discounts, if any,
attributable to the sales of the shares will be borne by the selling
stockholders. The selling stockholders may agree to indemnify any broker-dealer
or agent that participates in transactions involving sales of the shares against
certain liabilities, including liabilities arising under the Securities Act. The
Company will not receive any proceeds from the sale of the shares.
 
     The Company may suspend the use of this prospectus for up to an aggregate
of 20 trading days, if, in the reasonable judgment of the Company, a development
has occurred or condition exists as a result of which the Registration Statement
or the prospectus does not contain material non-public information which in the
reasonable judgment of the Company is required to be included in the
Registration Statement or the Prospectus for sales of the shares to be made
hereunder. The Company is obligated in the event of such suspension to amend the
Registration Statement or the prospectus to take all actions necessary to ensure
that the use of the prospectus may be resumed as soon as practicable In
addition, the Selling Stockholders are not permitted to use this prospectus for
effecting resales during the following periods: (i) the period beginning March
15, 1999 and ending on the second day after Synopsys's public announcement of
its results of operations for the second quarter of Synopsys's fiscal 1999
reporting year; (ii) the period beginning June 15, 1999 and ending on the second
day after Synopsys's public announcement of its results of operations for the
third quarter of Synopsys's fiscal 1999 reporting year; and (iii) the period
beginning September 15, 1999 and ending on the second day after Synopsys's
public announcement of its results of operations for the fourth quarter of
Synopsys's 1999 reporting year or November 20, 1999, whichever comes first.
 
     The Company has agreed with the selling stockholders to keep the
registration statement of which this prospectus constitutes a part effective
until November 20, 1999. Trading of any unsold shares after November 20, 1999
will be subject to compliance with all applicable securities laws, including
Rule 144.
 
     There can be no assurance that the selling stockholders will sell any or
all of the shares of common stock offered by them hereunder.
 
                                 LEGAL MATTERS
 
     The validity of the shares of common stock offered hereby has been passed
upon for the Company by Wilson Sonsini Goodrich & Rosati, Professional
Corporation, Palo Alto, California.
 
                                    EXPERTS
 
     The consolidated financial statements and schedule of the Company as of
September 30, 1997 and 1996, and for each of the years in the three-year period
ended September 30, 1997, have been incorporated by reference herein and in the
Registration Statement in reliance upon the report of KPMG Peat Marwick LLP,
independent certified public accountants, incorporated by reference herein; and
upon the authority of said firm as experts in accounting and auditing.
 
     The consolidated financial statements of EPIC Design Technology, Inc. as of
September 30, 1996 and for each of the two years in the period then ended (none
of which are presented herein) have been audited by Deloitte & Touche LLP,
independent auditors, as stated in their report, which is incorporated herein by
reference from Synopsys, Inc.'s Annual Report of Form 10-K for the year ended
September 30, 1997, and have been so incorporated in reliance upon the report of
such firm given upon their authority as experts in accounting and auditing.
 
                                       11
<PAGE>   13
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION
 
     The following table sets forth the costs and expenses, payable by the
Company in connection with the sale of common stock being registered. All
amounts are estimates except the SEC registration fee and Nasdaq National Market
listing fee.
 
<TABLE>
<CAPTION>
                                                              AMOUNT TO BE PAID
                                                              -----------------
<S>                                                           <C>
SEC registration fee........................................       $ 8,694
Nasdaq National market listing fee..........................        17,500
Printing expenses...........................................        10,000
Legal fees and expenses.....................................        10,000
Accounting fees and expenses................................         7,500
Miscellaneous expenses......................................         6,306
                                                                   -------
          Total.............................................       $60,000
                                                                   =======
</TABLE>
 
ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Section 145 of the Delaware General Corporation Law permits a corporation
to include in its charter documents and in agreements between the corporation
and its directors and officers, provisions expanding the scope of
indemnification beyond that specifically provided by the current law.
 
     Article X of the Company's Restated Certificate of Incorporation provides
for the indemnification of directors to the fullest extent permitted under
Delaware law.
 
     Article VII of the Company's Bylaws provides for the indemnification of
officers, directors and third parties acting on behalf of the corporation to the
fullest extent permitted under the General Corporation Law of Delaware.
 
     The Registrant has entered into indemnification agreements with its
directors and executive officers, in addition to indemnification provided for in
the Registrant's Bylaws, and intends to enter into indemnification agreements
with any new directors and executive officers in the future.
 
     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers, or persons controlling the
Registrant pursuant to the foregoing provisions, the Registrant has been
informed that in the opinion of the Securities and Exchange Commission such
indemnification is against public policy as expressed in the Securities Act and
is therefore unenforceable.
 
     The Registration Rights Agreement dated October 26, 1998, by the Registrant
made in connection with the acquisition of Everest provides that the Company
will indemnify the selling stockholders against certain liabilities, including
liabilities under the Securities Act.
 
     At present, there is no pending litigation or proceeding involving a
director, officer, employee, or other agent of the Registrant in which
indemnification is being sought, nor is the Registrant aware of any threatened
litigation that may result in a claim for indemnification by any director,
officer, employee, or other agent of the Registrant.
 
                                       12
<PAGE>   14
 
ITEM 16. EXHIBITS
 
<TABLE>
<CAPTION>
    EXHIBIT NO.                           DESCRIPTION
    -----------                           -----------
    <C>           <S>
        4.1       Registration Rights Agreement dated October 26, 1998,
                  granted by the Registrant to the selling stockholders
        5.1       Opinion of Wilson Sonsini Goodrich & Rosati, Professional
                  Corporation
       23.1       Consent of KPMG Peat Marwick LLP, Independent Auditors
                  (relating to financial statements of Synopsys, Inc.)
       23.2       Consent of Deloitte & Touche LLP, Independent Accountants
                  (relating to financial statements of EPIC Design Technology,
                  Inc.)
       23.3       Consent of Counsel (included in Exhibit 5.1)
       24.1       Power of Attorney (See II-5)
</TABLE>
 
ITEM 17. UNDERTAKINGS
 
     The Registrant hereby undertakes:
 
          1. To file, during any period in which offers or sales are being made,
     a post-effective amendment to this Registration Statement:
 
             (a) To include any prospectus required by Section 10(a)(3) of the
        Securities Act;
 
             (b) To reflect in the prospectus any facts or events arising after
        the effective date of the Registration Statement (or the most recent
        post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the Registration Statement;
 
             (c) To include any material information with respect to the plan of
        distribution not previously disclosed in the Registration Statement or
        any material change to such information in the Registration Statement;
        provided, however, that paragraphs (a) and (b) above do not apply if the
        information required to be included in a post-effective amendment by
        those paragraphs is contained in periodic reports filed by the Company
        pursuant to Section 13 or Section 15(d) of the Exchange Act that are
        incorporated by reference in the Registration Statement.
 
          2. That, for the purpose of determining any liability under the
     Securities Act, each such post-effective amendment shall be deemed to be a
     new registration statement relating to the securities offered therein, and
     the offering of such securities at that time shall be deemed to be the
     initial bona fide offering thereof.
 
          3. To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
          4. That, for the purpose of determining any liability under the
     Securities Act, each filing of the Registrant's annual report pursuant to
     Section 13(a) or Section 15(d) of the Exchange Act, (and, where applicable,
     each filing of an employee benefit plan's annual report pursuant to Section
     15(d) of the Exchange Act) that is incorporated by reference in the
     Registration Statement shall be deemed to be a new registration statement
     relating to the securities offered therein, and the offering of such
     securities at that time shall be deemed to be the initial bona fide
     offering thereof.
 
          5. To deliver or cause to be delivered with the prospectus, to each
     person to whom the prospectus is sent or given, the latest annual report to
     security holders that is incorporated by reference in the prospectus and
     furnished pursuant to and meeting the requirements of Rule 14a-3 or Rule
     14c-3 under the Exchange Act; and, where interim financial information
     required to be presented by Article 3 of Regulation S-X are not set forth
     in the prospectus, to deliver, or cause to be delivered to each person to
     whom the prospectus is sent or given, the latest quarterly report that is
     specifically incorporated by reference in the prospectus to provide such
     interim financial information.
 
                                       13
<PAGE>   15
 
          6. Insofar as indemnification for liabilities arising under the
     Securities Act may be permitted to directors, officers and controlling
     persons of the Registrant pursuant to the foregoing provisions, or
     otherwise, the Registrant has been advised that in the opinion of the SEC
     such indemnification is against public policy as expressed in the
     Securities Act and is, therefore, unenforceable. In the event that a claim
     for indemnification against such liabilities (other than the payment by the
     Registrant of expenses incurred or paid by a director, officer, or
     controlling person of the Registrant in the successful defense of any
     action, suit, or proceeding) is asserted by such director, officer, or
     controlling person in connection with the securities being registered, the
     Registrant will, unless in the opinion of its counsel the matter has been
     settled by controlling precedent, submit to a court of appropriate
     jurisdiction the question whether such indemnification by it is against
     public policy as expressed in the Securities Act and will be governed by
     the final adjudication of such issue.
 
                                       14
<PAGE>   16
 
                                   SIGNATURES
 
     Pursuant to the requirements of the Securities Act of 1933, as amended, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Mountain View, State of California, on the 25th day
of November 1998.
 
                                          SYNOPSYS, INC.
 
                                          By: /s/    AART J. DE GEUS
                                            ------------------------------------
                                            Aart J. de Geus
                                            Chief Executive Officer
 
                               POWER OF ATTORNEY
 
     KNOW ALL PERSONS BY THESE PRESENTS, that each such person whose signature
appears below constitutes and appoints, jointly and severally, Aart J. de Geus
and David Sugishita as their attorneys-in-fact, each with the power of
substitution, for him in any and all capacities, to sign any amendments to this
Registration Statement on Form S-3 (including post-effective amendments), to
sign any registration statement for the same offering covered by this
Registration Statement that is to be effective upon filing pursuant to Rule
462(b) promulgated under the Securities Act of 1933, and to file the same, with
all exhibits thereto and other documents in connection therewith, with the
Securities and Exchange Commission, thereby ratifying and confirming all that
each of said attorneys-in-fact, or his substitute or substitutions, may do or
cause to be done by virtue hereof.
 
     Pursuant to the requirements of the Securities Act of 1933, as amended,
this Registration Statement has been signed by the following persons in the
capacities and on the dates indicated:
 
<TABLE>
<CAPTION>
                       SIGNATURE                                    TITLE                  DATE
                       ---------                                    -----                  ----
<S>                                                       <C>                        <C>
/s/ AART J. DE GEUS                                        Chief Executive Officer   November 25, 1998
- --------------------------------------------------------    (Principal Executive
Aart J. de Geus                                           Officer) and Chairman of
                                                           the Board of Directors
 
/s/ CHI-FOON CHAN                                             President, Chief       November 25, 1998
- --------------------------------------------------------    Operating Officer and
Chi-Foon Chan                                                     Director
 
/s/ WILLIAM W. LATTIN                                     Executive Vice President   November 25, 1998
- --------------------------------------------------------        and Director
William W. Lattin
 
/s/ DEBORAH COLEMAN                                               Director           November 25, 1998
- --------------------------------------------------------
Deborah Coleman
 
/s/ HARVEY C. JONES, JR.                                          Director           November 25, 1998
- --------------------------------------------------------
Harvey C. Jones, Jr.
 
/s/ RICHARD NEWTON                                                Director           November 25, 1998
- --------------------------------------------------------
A. Richard Newton
</TABLE>
 
                                       15
<PAGE>   17
 
<TABLE>
<CAPTION>
                       SIGNATURE                                    TITLE                  DATE
                       ---------                                    -----                  ----
<S>                                                       <C>                        <C>
/s/ STEVEN C. WALSKE                                              Director           November 25, 1998
- --------------------------------------------------------
Steven C. Walske
 
/s/ DAVID SUGISHITA                                        Chief Financial Officer   November 25, 1998
- --------------------------------------------------------    (Principal Financial
David Sugishita                                                   Officer)
</TABLE>
 
                                       16
<PAGE>   18
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
EXHIBIT NO.                           DESCRIPTION
- -----------                           -----------
<C>           <S>
    4.1       Registration Rights Agreement dated October 26, 1998,
              granted by the Registrant to the selling stockholders
    5.1       Opinion of Wilson Sonsini Goodrich & Rosati, Professional
              Corporation
   23.1       Consent of KPMG Peat Marwick LLP, Independent Auditors
              (relating to financial statements of Synopsys, Inc.)
   23.2       Consent of Deloitte & Touche LLP, Independent Accountants
              (relating to financial statements of EPIC Design Technology,
              Inc.)
   23.3       Consent of Counsel (included in Exhibit 5.1)
   24.1       Power of Attorney (See II-5)
</TABLE>

<PAGE>   1

                                                                     EXHIBIT 4.1


                                 SYNOPSYS, INC.

                          REGISTRATION RIGHTS AGREEMENT


     This Registration Rights Agreement (the "Rights Agreement") is made as of
October 26, 1998, by and among Synopsys, Inc., a Delaware corporation
("Parent"), and the undersigned shareholders (each a "Holder" as further defined
below) of Everest Design Automation Inc., a California corporation (the
"Company"), acquiring shares of Parent Common Stock pursuant to that Agreement
of Merger and Plan of Reorganization dated effective as of October 26, 1998 (the
"Reorganization Agreement"), among Parent, Company and Tenzing Acquisition
Corporation, a California corporation and wholly-owned subsidiary of Parent
("Merger Sub"), and pursuant to the related Agreement of Merger (the "Agreement
of Merger") between the Company and Merger Sub and in consideration of such
shareholders' approving the Reorganization Agreement and the transactions
contemplated thereby.

     1.   Definitions. As used in this Rights Agreement:

          (a)  "Effective Time" means the time of acceptance by the Secretary of
State of the State of Delaware of the Merger Certificate.

          (b)  "Exchange Act" means the Securities Exchange Act of 1934, as 
amended.

          (c)  "Holder" means (i) a shareholder of the Company to whom shares of
Common Stock of Parent are issued pursuant to the Reorganization Agreement or
(ii) any transferee to whom registration rights granted under this Rights
Agreement are assigned pursuant to Section 6 of this Rights Agreement.

          (d)  "Registrable Securities" means, for each Holder, the number of 
shares of Common Stock of Parent issued to such Holder pursuant to the
Reorganization Agreement (other than Escrow Shares); provided, however, that any
Common Stock of Parent that were Registrable Securities hereunder shall cease to
be Registrable Securities after the earlier to occur of such time as (i) Parent
has satisfied its obligations to register for resale and maintain the
effectiveness of a registration statement relating to such shares on the terms
and conditions set forth in Section 2(b); or (ii) such shares have been
registered for resale by Parent on Form S-8/S-3 pursuant to Section 6.17 of the
Reorganization Agreement.

          (e)  "Securities Act" means the Securities Act of 1933, as amended.

          (f)  "SEC" means the Securities and Exchange Commission.

          Terms not otherwise defined herein shall have the meanings given to 
them in the Reorganization Agreement.


<PAGE>   2

     2.   Holder Registration.

          (a)  Parent shall use its best efforts to cause the Registrable 
Securities held by each Holder to be registered under the Securities Act so as
to permit the sale thereof, and in connection therewith shall prepare and file
with the SEC not later than December 1, 1998, a registration statement covering
all the Registrable Securities on such form as is then available under the
Securities Act; provided, however, that each Holder shall provide all such
information and materials regarding such Holder and take all such action as may
be required by a Holder under applicable laws and regulations in order to permit
Parent to comply with all applicable requirements of the Securities Act, the
Exchange Act, and the SEC, and to obtain any desired acceleration of the
effective date of such registration statement, such provision of information and
materials to be a condition precedent to the obligations of Parent pursuant to
this Rights Agreement to register the Registrable Securities held by each such
Holder. Notwithstanding the foregoing, Parent shall not be required (assuming no
review by the SEC) to request acceleration of such registration statement for
any date prior to the date two days after the public announcement of Parent's
results of operations for the first quarter of Parent's fiscal 1999 reporting
year. The offerings made pursuant to such registration shall not be
underwritten.

          (b)  Parent shall (i) prepare and file with the SEC the registration
statement in accordance with Section 2 hereof with respect to the Registrable
Securities and shall use its best efforts to cause such registration statement
to become effective as promptly as practicable after filing, including without
limitation using best efforts to respond to comment letters and requests for
information from the SEC, by the second day after the public announcement of
Parent's results of operations for the first quarter of Parent's fiscal 1999
reporting year (but shall not be required to request acceleration for any date
prior to the date two days after the public announcement of Parent's results of
operations for the first quarter of Parent's fiscal 1999 reporting year) and to
keep such registration statement effective until the first to occur of (A) the
date on which all Registrable Securities included within such registration
statement have been sold or (B) the first anniversary of the Effective Time;
(ii) prepare and file with the SEC such amendments to such registration
statement and amendments or supplements to the prospectus used in connection
therewith as may be necessary to comply with the provisions of the Securities
Act with respect to the sale or other disposition of all securities registered
by such registration statement; (iii) furnish to each Holder such number of
copies of any prospectus (including any preliminary prospectus and any amended
or supplemented prospectus) in conformity with the requirements of the
Securities Act, and such other documents, as each Holder may reasonably request
in order to effect the offering and sale of the Registrable Securities to be
offered and sold, but only while Parent shall be required under the provisions
hereof to cause the registration statement to remain effective; (iv) use its
best efforts to register or qualify the Registrable Securities covered by such
registration statement under the securities or blue sky laws of such
jurisdictions as each Holder shall reasonably request (provided that Parent
shall not be required in connection therewith or as a condition thereto to
qualify to do business or to file a general consent to service of process in any
such jurisdiction where it has not been qualified or is not otherwise subject to
a general consent for service of process), and do any and all other acts or
things which may be necessary or advisable to enable each Holder to consummate
the public sale or other disposition of such Registrable Securities in such
jurisdictions; and (v) notify each Holder, promptly after it shall receive
notice thereof, of the date and time the registration statement and each


                                      -2-

<PAGE>   3

post-effective amendment thereto has become effective or a supplement to any
prospectus forming a part of such registration statement has been filed.

     3.   Suspension of Prospectus.

          (a)  Under any registration statement filed pursuant to this Rights
Agreement, Parent may restrict disposition of Registrable Securities, and a
Holder will not be able to dispose of such Registrable Securities, if Parent
shall have delivered a notice in writing to such Holder stating that a delay in
the disposition of such Registrable Securities is necessary because Parent, in
its reasonable judgment, has determined that such sales would require public
disclosure by Parent of material non-public information that is not included in
such registration statement. In the event of the delivery of the notice
described above by Parent in the case of a registration statement filed pursuant
to Section 2, Parent shall amend such registration statement and/or amend or
supplement the related prospectus if necessary to take all other actions
necessary to allow the proposed sale to take place as promptly as possible,
subject, however, to the right of Parent to delay further sales of Registrable
Securities until the conditions or circumstances referred to in the notice have
ceased to exist or have been disclosed. Such right to delay sales shall not
exceed 20 trading days in the aggregate (in addition to the periods under which
Parent may restrict sales pursuant to Section 3(b) below).

          (b)  In addition to the restrictions on disposition set forth in
subparagraph (a) above, no Holder shall be permitted to dispose of any
Registrable Securities pursuant to the registration statement during the
following periods: (i) the period beginning March 15, 1999 and ending on the
second day after Parent's public announcement of its results of operations for
the second quarter of Parent's fiscal 1999 reporting year; (ii) the period
beginning June 15, 1999 and ending on the second day after Parent's public
announcement of its results of operations for the third quarter of Parent's
fiscal 1999 reporting year; and (iii) the period beginning September 15, 1999
and ending on the second day after Parent's public announcement of its results
of operations for the fourth quarter of Parent's fiscal 1999 reporting year or
the first anniversary of the Effective Time, whichever occurs first. The
limitations of this Section 3(b) shall not apply to dispositions by a Holder in
compliance with all applicable securities laws to any affiliate or constituent
partner, including any limited partner, of a Holder; provided however, that any
transfer of rights under this Rights Agreement complies with Section 6 hereof.

     4.   Expenses. All of the out-of-pocket expenses incurred in connection 
with any registration of Registrable Securities pursuant to this Rights
Agreement, including, without limitation, all SEC, Nasdaq National Market and
blue sky registration and filing fees, printing expenses, transfer agents' and
registrars' fees, and the fees and disbursements of Parent's outside counsel and
independent accountants shall be paid by Parent. Parent shall not be responsible
to pay any legal fees for any Holder or any selling expenses of any Holder
(including, without limitation, any broker's fees or commissions, including
underwriter commissions).


                                      -3-
<PAGE>   4

     5.   Indemnification.

          (a)  Parent will indemnify each Holder, each of its officers,
directors and partners and such Holder's legal counsel and independent
accountants, and each person controlling such Holder within the meaning of
Section 15 of the Securities Act, with respect to which registration,
qualification or compliance has been effected pursuant to this Rights Agreement
against all expenses, claims, losses, damages and liabilities (or actions in
respect thereof), including any of the foregoing incurred in settlement of any
litigation, commenced or threatened, arising out of or based on any untrue
statement (or alleged untrue statement) of a material fact contained in any
registration statement, prospectus, offering circular or other document, or any
amendment or supplement thereto, incident to any such registration,
qualification or compliance, or based on any omission (or alleged omission) to
state therein a material fact required to be stated therein or necessary to make
the statements therein, in light of the circumstances in which they are made,
not misleading, or any violation by Parent of any rule or regulation promulgated
under the Securities Act, the Exchange Act or state securities laws, or common
law, applicable to Parent in connection with any such registration,
qualification or compliance, and will reimburse each such Holder, each of its
officers, directors and partners and such Holder's legal counsel and independent
accountants and each person controlling such Holder, for any legal and any other
expenses reasonably incurred in connection with investigating, preparing or
defending any such claim, loss, damage, liability or action, provided that
Parent will not be liable in any such case to the extent that any such claim,
loss, damage, liability or expense (i) arises out of or is based in any untrue
statement or omission or alleged untrue statement or omission, made in reliance
upon and in conformity with written information furnished to Parent in an
instrument duly executed by such Holder or underwriter and stated to be
specifically for use therein or (ii) applicable to any sale effected by a Holder
during any period in which dispositions were restricted pursuant to Section 3.

          (b)  Each Holder will, if Registrable Securities held by such Holder
are included in the securities as to which such registration, qualification or
compliance is being effected, indemnify Parent, each of its directors and
officers and its legal counsel and independent accountants, each underwriter, if
any, of Parent's securities covered by such a registration statement, each
person who controls Parent or such underwriter within the meaning of Section 15
of the Securities Act, and each other such Holder, each of its officers and
directors and each person controlling such Holder within the meaning of Section
15 of the Securities Act, against all claims, losses, damages and liabilities
(or actions in respect thereof) arising out of or based on any untrue statement
(or alleged untrue statement) of a material fact contained in any such
registration statement, prospectus, offering circular or other document, or any
omission (or alleged omission) to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, and
will reimburse Parent, such Holders, such directors, officers, legal counsel,
independent accountants, underwriters or control persons for any legal or any
other expenses reasonably incurred in connection with investigating or defending
any such claim, loss, damage, liability or action, in each case to the extent,
but only to the extent, that such untrue statement (or alleged untrue statement)
or omission (or alleged omission) is made in such registration statement,
prospectus, offering circular or other document in reliance upon and in
conformity with written information furnished to Parent by an instrument duly
executed by such Holder and stated to be specifically for use therein; provided,
however, that the obligations of such Holders hereunder shall be limited to an
amount equal 


                                      -4-


<PAGE>   5

to the gross proceeds before expenses and commissions to each such Holder of
Registrable Securities sold as contemplated herein.

          (c)  Each party entitled to indemnification under this Section 5 (the
"Indemnified Party") shall give notice to the party required to provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has written notice of any claim as to which indemnity may be sought, and shall
permit the Indemnifying Party to assume the defense of any such claim or any
litigation resulting therefrom, provided that counsel for the Indemnifying
Party, who shall conduct the defense of such claim or litigation, shall be
approved by the Indemnified Party (whose approval shall not be unreasonably
withheld), and the Indemnified Party may participate in such defense at such
party's expense, and provided further that the failure of any Indemnified Party
to give notice as provided herein shall not relieve the Indemnifying Party of
its obligations under this Rights Agreement, except to the extent, but only to
the extent, that the Indemnifying Party's ability to defend against such claim
or litigation is impaired as a result of such failure to give notice. No
Indemnifying Party, in the defense of any such claim or litigation, shall,
except with the consent of each Indemnified Party, consent to entry of any
judgment or enter any settlement which does not include as an unconditional term
thereof the giving by the claimant or plaintiff to the Indemnified Party of a
release from all liability in respect to such claim or litigation. 

          (d)  If the indemnification provided for in the preceding paragraphs
of this Section 5 is unavailable to an Indemnified Party in respect of any
expenses, claims, losses, damages or liabilities referred to herein, or is
insufficient to hold such Indemnified Party harmless, then, except to the extent
that contribution is not permitted under Section 11(f) of the Securities Act,
the Company and the Holders, as the case may require, shall contribute to the
amount paid or payable by such Indemnified Party as a result of such expenses,
claims, losses, damages or liabilities in such proportion as is appropriate to
reflect the relative fault of the Company, such Holder, or such Indemnified
Party, as the case may be, in connection with the actions, statements or
omissions that resulted in such expenses, claims, losses, damages or
liabilities. The relative fault of the Company, such Holder, and such
Indemnified Party, shall be determined by reference to, among other things,
whether any action in question, including any untrue statement of a material
fact or omission to state a material fact, has been taken or made by, or relates
to information supplied by, the Company, such Holder, or such Indemnified Party,
and the parties' relative intent, knowledge, access to information concerning
the matter with respect to which the claim was asserted and opportunity to
correct or prevent such action, statement or omission, as well as any other
relevant equitable considerations appropriate under the circumstances. The
parties hereto agree that it would not be just and equitable if contribution
pursuant to this paragraph (d) were determined by pro rata allocation or by any
other method of allocation that does not take into account the equitable
considerations referred to in the immediately preceding sentence.
Notwithstanding the provisions of this paragraph (d), no Holder shall be
required to contribute any amount in excess of the amount by which the gross
proceeds (after deducting reasonable expenses and commissions) received by such
Holder from the sale of Registrable Securities exceeds the amount of any damages
that such Holder has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission. No person guilty of fraudulent
misrepresentation (within the meaning of Section 11(f) of the 


                                      -5-

<PAGE>   6

Securities Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation.

          (e)  The obligations of Parent and each Holder under this Section 5
shall survive the completion of any offering of Registrable Securities in a
registration statement under this Rights Agreement and otherwise.

     6.   Assignment of Registration Rights. The rights to cause Parent to
register Registrable Securities pursuant to this Rights Agreement may be
assigned by a Holder to a transferee of Registrable Securities only if: (a)
Parent is, prior to such transfer, furnished with written notice of the name and
address of such transferee and the Registrable Securities with respect to which
such registration rights are being assigned and a copy of a duly executed
written instrument in form reasonably satisfactory to Parent by which such
transferee assumes all of the obligations and liabilities of its transferor
hereunder and agrees itself to be bound hereby and (b) immediately following
such transfer the disposition of such Registrable Securities by the transferee
is restricted under the Securities Act. 

     7.   Amendment of Registration Rights. Holders of a majority of the
Registrable Securities from time to time outstanding may, with the consent of
Parent, amend the registration rights granted hereunder.

     8.   Compliance with Laws. Parent agrees, in connection with the
registration rights granted hereunder, to comply with applicable provisions of
the Securities Act and the Exchange Act and the rules and regulations
promulgated thereunder such that the benefits of such rights will inure to the
Holders.

     9.   Counterparts. This Rights Agreement may be executed in any number of
counterparts, each of which shall be enforceable against the parties executing
such counterparts, and all of which together shall constitute one instrument.



                  [Remainder of Page Intentionally Left Blank]



                                      -6-

<PAGE>   7

     IN WITNESS WHEREOF, the parties hereto have executed this Rights Agreement 
as of the day and year first written above.


                                       SYNOPSYS, INC.


                                       By:
                                          --------------------------------------

                                       Name:
                                            ------------------------------------

                                       Title:
                                             -----------------------------------



                                       HOLDER


                                       By:
                                          --------------------------------------

                                       Name:
                                            ------------------------------------

                                       Title:
                                             -----------------------------------




                      [Signature Page to Rights Agreement]


                                      -7-

<PAGE>   1
                                                                     EXHIBIT 5.1


                [LETTERHEAD OF WILSON SONSINI GOODRICH & ROSATI]

                               November 25, 1998



Synopsys, Inc.
700 East Middlefield Road
Mountain View, California 94043

         RE:   REGISTRATION STATEMENT ON FORM S-3

Ladies and Gentlemen:

         We have examined the Registration Statement on Form S-3 to be filed by
you with the Securities and Exchange Commission on November 25, 1998 (the
"Registration Statement"), in connection with the registration under the
Securities Act of 1933, as amended, of 638,462 shares of your common stock (the
"Shares"), all of which are authorized and have been previously issued to the
selling stockholders named therein in connection with the acquisition by the
Company of Everest Design Automation Inc. The Shares are to be offered by the
selling stockholders for sale to the public as described in the Registration
Statement. As your counsel in connection with this transaction, we have examined
the proceedings taken and proposed to be taken in connection with the sale of
the Shares.

         It is our opinion that, upon completion of the proceedings being taken
or contemplated to be taken prior to the registration of the Shares, including
such proceedings to be carried out in accordance with the securities laws of the
various states, where required, the Shares, when sold in the manner referred to
in the Registration Statement, will be legally and validly issued, fully paid
and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement, and further consent to the use of our name wherever appearing in the
Registration Statement, including the prospectus constituting a part thereof,
and any amendment thereto.

                                       Very truly yours,

                                       /s/ WILSON SONSINI GOODRICH & ROSATI

                                       WILSON SONSINI GOODRICH & ROSATI
                                       Professional Corporation


<PAGE>   1
                                                                    EXHIBIT 23.1



                         CONSENT OF INDEPENDENT AUDITORS



The Board of Directors
Synopsys, Inc.

We consent to the incorporation by reference in the registration statement dated
November 20, 1998, on Form S-3 of Synopsys, Inc. of our report dated October 17,
1997, relating to the consolidated balance sheets of Synopsys, Inc. and
subsidiaries as of September 30, 1997, and 1996, and the related consolidated
statements of income, stockholders' equity, and cash flows for each of the years
in the three-year period ended September 30, 1997, which report appears in the
September 30, 1997 annual report on Form 10-K of Synopsys, Inc., and to the
reference to our firm under the heading "experts" in the prospectus.




                                       /S/ KPMG PEAT MARWICK LLP




Mountain View, California
November 20, 1998



<PAGE>   1
                                                                    EXHIBIT 23.2


                         CONSENT OF INDEPENDENT AUDITORS



                        CONSENT OF DELOITTE & TOUCHE LLP

We consent to the incorporation by reference in this Registration Statement of
Synopsys, Inc. on Form S-3 of our report dated October 11, 1996 (relating to the
consolidated financial statements of EPIC Design Technology, Inc. not presented
separately therein), appearing in and incorporated by reference in the Annual
Report on Form 10-K of Synopsys, Inc. for the year ended September 30, 1997 and
to the reference to us under the heading "Experts" in the Prospectus, which is
part of this Registration Statement.




DELOITTE & TOUCHE LLP

San Jose, California
November 20, 1998




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