CADENCE DESIGN SYSTEMS INC
S-3, 1997-01-28
PREPACKAGED SOFTWARE
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<PAGE>
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JANUARY 28, 1997
                                                     REGISTRATION NO. 333-
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
                          CADENCE DESIGN SYSTEMS, INC.
             (Exact name of Registrant as specified in its charter)
 
                DELAWARE                                77-0148231
    (State or other jurisdiction of                  (I.R.S. Employer
     incorporation or organization)               Identification Number)
 
                            ------------------------
                                2655 SEELY ROAD
                                   BUILDING 5
                           SAN JOSE, CALIFORNIA 95134
                                 (408) 943-1234
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)
                            ------------------------
                           R.L. SMITH MCKEITHEN, ESQ.
                       VICE PRESIDENT AND GENERAL COUNSEL
                          CADENCE DESIGN SYSTEMS, INC.
                                2655 SEELY ROAD
                                   BUILDING 5
                           SAN JOSE, CALIFORNIA 95134
                                 (408) 943-1234
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                            ------------------------
                                   COPIES TO:
                            ALAN C. MENDELSON, ESQ.
                            JULIA L. DAVIDSON, ESQ.
                               COOLEY GODWARD LLP
                             FIVE PALO ALTO SQUARE
                              3000 EL CAMINO REAL
                          PALO ALTO, CALIFORNIA 94306
                                 (415) 843-5000
                               FAX (415) 857-0663
                            ------------------------
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
   AS SOON AS PRACTICABLE AFTER THE REGISTRATION STATEMENT BECOMES EFFECTIVE.
                            ------------------------
    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>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------
- ----------------------------------------------------------------------------------------------------------------------------
                                                                   PROPOSED MAXIMUM    PROPOSED MAXIMUM
  TITLE OF EACH CLASS OF SECURITIES TO BE        AMOUNT TO BE     OFFERING PRICE PER  AGGREGATE OFFERING      AMOUNT OF
                 REGISTERED                     REGISTERED(1)          SHARE(2)            PRICE(2)        REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>                 <C>                 <C>                 <C>
Common Stock $0.01 par value per share......    700,000 shares         $3.8823          $2,717,607.50          $825.00
- ----------------------------------------------------------------------------------------------------------------------------
- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Includes all of the shares of Common Stock issuable upon exercise of the
    Options.
(2) The price per share and aggregate offering price are based upon the weighted
    average exercise price of the shares to be issued pursuant to the Options of
    $3.8823.
                            ------------------------
    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 COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
                 SUBJECT TO COMPLETION, DATED JANUARY 28, 1997
 
                                 700,000 SHARES
 
                                     [LOGO]
 
                          CADENCE DESIGN SYSTEMS, INC.
 
                                  COMMON STOCK
                           (PAR VALUE $.01 PER SHARE)
                              -------------------
 
    This Prospectus relates to a total of 700,000 shares of Common Stock, par
value $0.01, which are issuable upon exercise of certain options (the "Options")
held by Margaret Costello (the "Optionee"). The Options were initially issued by
the Company to Joseph B. Costello, the Company's President and Chief Executive
Officer, pursuant to the Company's 1987 Stock Option Plan (the "Plan") and the
Nonqualified Stock Option Grant Agreement dated July 20, 1988, as amended on
January 22, 1997, and the Nonqualified Stock Option Regrant Agreement dated
April 26, 1993, as amended on January 22, 1997. In accordance with the Options
and the Plan, the Options have been transferred to and may be exercised by the
Optionee from time to time. See "Plan of Distribution".
 
    All of the 700,000 shares of Common Stock to be issued upon exercise of the
Options are being sold by the Company. The Company will receive all of the
proceeds from the exercise of the Options. See "Plan of Distribution". The last
reported sale price of the Common Stock, which is quoted under the symbol "CDN",
on the New York Stock Exchange on January 24, 1997 was $39.125 per share.
 
    SEE "RISK FACTORS" BEGINNING ON PAGE 4 FOR CERTAIN CONSIDERATIONS RELEVANT
TO AN INVESTMENT IN THE COMMON STOCK OFFERED HEREBY.
                               -----------------
    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
       AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS
         THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
      COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
           ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
                              -------------------
 
<TABLE>
<CAPTION>
                                   PROCEEDS TO
                                  COMPANY (1)(2)
                                ------------------
<S>                             <C>
Per Share (3).................       $3.8823
Total.........................    $2,717,607.50
</TABLE>
 
- --------------
 
(1) The Company will receive proceeds upon the exercise of the Options based
    upon an exercise price for 433,137 of the shares to be issued as pursuant to
    the Options of $3.8611 per share and an exercise price for the remaining
    266,863 of the shares to be issued pursuant to the Options of $3.9167 per
    share.
 
(2) Estimated expenses of $21,825 will be payable by the Optionee and have not
    been deducted. No underwriting commissions or discounts will be paid by the
    Company in connection with this offering.
 
(3) Per share proceeds is the weighted average of the exercise prices described
    in (1) above.
 
                The date of this Prospectus is January   , 1997.
<PAGE>
                             AVAILABLE INFORMATION
 
    Cadence Design Systems, Inc. ("Cadence" or the "Company") is subject to the
informational reporting requirements of the Securities Exchange Act of 1934, as
amended (the "Exchange Act"), and in accordance therewith files reports, proxy
statements and other information with the Securities and Exchange Commission
(the "Commission"). Such reports, proxy statements and other information can be
inspected and copied at the public reference facilities maintained by the
Commission at Room 1024, 450 Fifth Street, N.W., Judiciary Plaza, Washington,
D.C. 20549, and at the following Regional Offices of the Commission: Chicago
Regional Office, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661;
and New York Regional Office, 7 World Trade Center, Suite 1300, New York, New
York 10048. Copies of such material can be obtained at prescribed rates from the
Public Reference Section of the Commission at 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C. 20549. The Company's common stock (the "Common Stock")
is listed on the New York Stock Exchange (the "NYSE"), and such reports, proxy
statements and other information can also be inspected at the offices of the
NYSE at 20 Broad Street, New York, New York 10005.
 
    The Company has filed with the Commission a registration statement on Form
S-3 (herein, together with all amendments and exhibits, referred to as the
"Registration Statement") under the Securities Act of 1933, as amended (the
"Securities Act"). This Prospectus does not contain all of the information set
forth in the Registration Statement, certain parts of which are omitted in
accordance with the rules and regulations of the Commission. For further
information, reference is hereby made to the Registration Statement. The
Registration Statement and the exhibits thereto may be inspected, without
charge, at the offices of the Commission at 450 Fifth Street, N.W., Washington,
D.C. 20549, and copies may be obtained from the Commission at prescribed rates.
 
    The Commission maintains a World Wide Web site that contains reports, proxy
and information statements and other information regarding registrants that file
electronically with the Commission. The address of the site is
http://www.sec.gov.
 
                              -------------------
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The following documents filed by the Company with the Commission (Commission
File Number 1-10606) pursuant to the Exchange Act are by this reference
incorporated in and made a part of this
Prospectus:
 
    1.  The Company's Annual Report on Form 10-K for the fiscal year ended
       December 30, 1995;
 
    2.  The Company's Quarterly Reports on Form 10-Q for the quarterly periods
       ended March 30, 1996, June 29, 1996 and September 28, 1996;
 
    3.  The Company's Current Report on Form 8-K filed with the Commission on
       February 9, 1996;
 
    4.  The Company's Current Report on Form 8-K filed with the Commission on
       November 7, 1996;
 
    5.  The Company's Current Report on Form 8-K filed with the Commission on
       December 31, 1996;
 
    6.  The Company's Current Report on Form 8-K filed with the Commission on
       January 13, 1997;
 
    7.  The Company's Registration Statement on Form S-3, filed with the
       Commission on November 20, 1996;
 
    8.  The Company's Registration Statement on Form S-4, filed with the
       Commission on November 14, 1996;
 
    9.  The Company's Registration Statement on Form S-4, filed with the
       Commission on December 19, 1996;
 
                                       2
<PAGE>
    10. The Company's Registration Statement on Form S-8, filed with the
       Commission on December 30, 1996;
 
    11. The description of the Company's Preferred Share Purchase Rights
       contained in the Registration Statement on Form 8-A filed with the
       Commission on February 16, 1996; and
 
    12. The description of the Company's Common Stock contained in the
       Registration Statement on Form 8-A filed with the Commission on August
       29, 1990.
 
    The Company will provide without charge to each person, including any
beneficial owner, to whom a copy of this Prospectus is delivered, upon the
written or oral request of any such person, a copy of any or all of the
documents which are incorporated herein by reference, other than exhibits to
such information (unless such exhibits are specifically incorporated by
reference into such documents). Requests should be directed to Investor
Relations, Cadence Design Systems, Inc., 2655 Seely Road, Building 5, San Jose,
California 95134; telephone number (408) 943-1234.
                              -------------------
 
    All documents filed by the Company pursuant to Section 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Prospectus and prior to the
termination of this offering shall be deemed to be incorporated by reference
herein and to be a part of this Prospectus from the date of filing of such
documents. Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any other subsequently filed document 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 this Prospectus.
 
                                       3
<PAGE>
                                  RISK FACTORS
 
    EXCEPT FOR HISTORICAL INFORMATION CONTAINED HEREIN, THIS PROSPECTUS CONTAINS
FORWARD LOOKING STATEMENTS THAT INVOLVE RISKS AND UNCERTAINTIES. THE COMPANY'S
ACTUAL RESULTS MAY DIFFER MATERIALLY. FACTORS THAT CAUSE OR CONTRIBUTE TO SUCH
DIFFERENCES INCLUDE, BUT ARE NOT LIMITED TO, THOSE DISCUSSED BELOW AS WELL AS
THOSE DISCUSSED ELSEWHERE IN THIS PROSPECTUS AND IN THE DOCUMENTS INCORPORATED
HEREIN BY REFERENCE.
 
    THE COMMON STOCK COVERED BY THIS PROSPECTUS INVOLVES A HIGH DEGREE OF RISK.
IN ADDITION TO THE OTHER INFORMATION INCLUDED OR INCORPORATED BY REFERENCE IN
THIS PROSPECTUS, PROSPECTIVE INVESTORS SHOULD CAREFULLY CONSIDER THE FOLLOWING
FACTORS IN EVALUATING THE COMPANY AND ITS BUSINESS BEFORE INVESTING IN ANY
SHARES OF THE COMMON STOCK OFFERED HEREBY.
 
TECHNOLOGICAL CHANGE AND DEVELOPMENT OF NEW PRODUCTS AND SERVICES
 
    Because of rapid technological changes in the electronic design automation
("EDA") industry, the Company's future revenues will depend on its ability to
develop or acquire new products and enhance its existing products on a timely
basis to keep pace with innovations in integrated circuit ("IC") technology and
to support a range of changing computer software and hardware platforms and
customer preferences.
 
    The Company's EDA software tools have a limited life cycle, requiring the
Company to make periodic product enhancements and new product introductions.
There can be no assurance that the Company's products will not become obsolete,
or that any new or enhanced products it develops or markets will be competitive
or achieve market acceptance. The Company believes that the mergers will enhance
the Company's ability to help customers design chips with feature sizes of 0.5
micron and below. If the Company fails to obtain new or developed technology
through the mergers or the mergers are substantially delayed or not consummated,
new product introductions could be substantially delayed, and the Company would
be required to devote significant additional management and technical resources
to develop such technology internally. Failures of or significant delays in
product development could result in a loss of competitiveness of the Company's
products and could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
    In addition, many of the Company's products operate only on certain versions
of the UNIX operating system. The Company has only recently begun the
development work necessary to port its software to Windows NT. Failure of the
Company's products to keep pace with changes in manufacturing technology or
processes, software and hardware platforms and customer preferences could render
one or more of the Company's software tools obsolete, which could have a
material adverse effect on the Company's business, financial condition and
results of operations.
 
PROPOSED ACQUISITION; FAILURE TO CONSUMMATE PROPOSED ACQUISITION; UNCERTAINTY
  RELATING TO INTEGRATION
 
    Part of the Company's strategy is to grow and improve its product offerings
through acquisitions. This strategy involves a number of risks, including risks
related to the integration of the acquired businesses, the substantial
management time devoted to such activities, undisclosed liabilities, the failure
to achieve anticipated benefits, such as cost savings and synergies, and
distribution, engineering, customer support and other issues related to product
transition.
 
    On December 18, 1996, the Company consummated a merger (the "HLDS Merger")
with High Level Design Systems, Inc., a Delaware corporation ("HLDS"), pursuant
to which HLDS became a wholly owned subsidiary of the Company. The
stock-for-stock merger is tax free to U.S. taxpayers and accounted for as a
purchase.
 
    On October 28, 1996, the Company entered into a merger agreement with Cooper
& Chyan Technology, Inc., a Delaware corporation ("CCT") pursuant to which, upon
fulfillment or waiver of certain
 
                                       4
<PAGE>
conditions, CCT will become a wholly owned subsidiary of the Company in a
stock-for-stock merger (the "CCT Merger") that is expected to be tax free and
accounted for as a pooling of interests. Holders of a majority of the
outstanding voting stock of CCT approved the CCT Merger at a special meeting of
stockholders held on January 24, 1997. There can be no assurance that the CCT
Merger will be consummated.
 
    Among the conditions that must be fulfilled in order to consummate the CCT
Merger is the expiration or termination of the waiting period applicable to the
CCT Merger under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended (the "HSR Act"). On January 3, 1997, the Company and CCT each received
requests from the U.S. Federal Trade Commission ("FTC") for information in
addition to their initial submissions with respect to the proposed CCT Merger.
The FTC action has the effect of extending the waiting period under the HSR Act
applicable to the transaction until 20 calendar days after both parties
substantially comply with the requests. The review of the Merger pursuant to the
HSR Act may substantially delay the Company's ability to consummate the Merger.
There can be no assurance that a challenge to the CCT Merger on antitrust
grounds will not be made, or if such a challenge is made, the Company will
prevail or would not be required to terminate the merger agreement, divest
certain assets, license certain proprietary technology or accept certain
conditions in order to consummate the CCT Merger. In addition, the Company has
the right to waive the condition that the CCT Merger be qualified for pooling of
interests accounting treatment. If the CCT Merger is consummated but fails to
qualify for pooling of interests accounting treatment, then the transaction
would be accounted for as a purchase. Accounting for the CCT Merger as a
purchase could result in a significant intangible asset or a significant charge
against results of operations or both, which could materially and adversely
affect future results of operations. There can be no assurance that all such
other conditions will be satisfied or waived, and therefore, there can be no
assurance that the CCT Merger will be consummated.
 
    In connection with the two mergers, customers or potential customers may
delay or cancel orders as a result of uncertainty about product evolution,
integration and support, and competitors may increase their efforts to solicit
the Company's or CCT's employees in light of uncertainty associated with the
mergers. Significant delays in or cancellations of orders or loss of employees
could have a material adverse effect on the Company's business, financial
condition and results of operations. In the event the CCT Merger is not
consummated, the descriptions of events contained in this Prospectus, including
those described by the pro forma financial statements incorporated by reference
may differ materially from those which actually transpire. Failure to consummate
the CCT Merger may result in employee uncertainty, potentially resulting in loss
of employees or reduction in their productivity, uncertainty in the marketplace
or delays or cancellations of orders by customers or potential customers. In
addition, new product introductions and enhancements of existing products could
be substantially delayed if the mergers are not consummated. Any of the
foregoing could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
    The Company intends to combine the operations and technologies of the
Company, CCT and HLDS as soon as practicable. Following the mergers, in order to
maintain and increase profitability, the Company, CCT and HLDS will need to
integrate and streamline overlapping functions successfully. Costs generally
associated with this type of integration that may be incurred by the Company
include the write off of capitalized software, severance payments, closing of
excess facilities and disposition of excess equipment. While the costs for the
CCT integration have not been currently identified, any such costs will have an
adverse effect on the Company's operating results in the periods in which they
are incurred. In addition, approximately $96 million of the purchase price paid
for HLDS was allocated to in process research and development and charged to
expense in the period ended December 28, 1996 when the acquisition was
consummated. The Company has the right to waive the condition that the CCT
Merger be qualified for pooling of interests accounting treatment. If the CCT
Merger is consummated but fails to qualify for pooling of interests accounting
treatment, then the transaction would be accounted for as a purchase. Accounting
for the CCT Merger as a purchase could result in a significant intangible asset
 
                                       5
<PAGE>
or a significant charge against results of operations or both, which could
materially and adversely affect future results of operations. Each of the
Company, CCT and HLDS has different systems and procedures in many operational
areas that must be rationalized and integrated. Among other things, the Company
must integrate product offerings, and coordinate research and development and
sales and marketing efforts. There may be substantial difficulties associated
with integrating three separate companies, and there can be no assurance that
such integration will be accomplished expeditiously or successfully. The
integration of certain operations following each acquisition will require the
dedication of management resources that may temporarily distract attention from
the day-to-day business of the Company. The business of the Company may also be
disrupted by employee uncertainty and lack of focus during such integration.
There can be no assurance that the Company will be able to retain key technical,
managerial and other employees. Failure to accomplish the integration of the
operations of the Company, CCT and HLDS could have a material adverse effect on
the Company's business, financial condition and results of operations. Moreover,
uncertainty in the marketplace or customer hesitation relating to the
acquisitions could have a material adverse effect on the Company's business,
financial condition and results of operations.
 
POTENTIAL FLUCTUATIONS IN OPERATING RESULTS
 
    The Company's operating expenses are partially based on its expectations
regarding future revenue. The Company's business, financial condition and
results of operations could be materially adversely affected if revenue in a
quarter does not materialize as anticipated. Since expenses are usually
committed in advance of revenues and because only a small portion of expenses
vary with revenue, the Company's business, financial condition and results of
operations may be affected significantly by lower revenue. The Company's focus
on providing services is relatively recent. The percentage revenue growth from
this source from 1995 to 1996 may not be indicative of future growth. In
addition, a substantial portion of the Company's revenues from services are
earned pursuant to fixed price contracts. Variances in costs associated with
those contracts could have a material adverse effect on the Company's business,
financial condition and results of operations. Although the Company's revenues
are not generally seasonal in nature, the Company has experienced, and may
continue to experience, decreases in first quarter revenue compared with the
preceding fourth quarter, which is believed to result primarily from the capital
purchase cycle of the Company's customers.
 
    The Company's business, financial condition and results of operations are
affected by the business cycles of its customers, including its customers in the
semiconductor industry, and the business cycles of the semiconductor industry as
a whole. In particular, during the past 12 months, conditions in the
semiconductor industry have been generally weak and a number of the Company's
customers have reduced their capital spending plans. There can be no assurance
that such conditions will improve in the near future, if at all, or that the
Company's customers will increase their rate of spending in the future. Changes
in the financial condition of the Company's customers could have a material
adverse effect on the Company's business, financial condition and results of
operations. In addition, the quarterly operating results of the Company may vary
substantially from period to period depending on factors such as increased
competition; the size, timing and structure of significant licenses; the timing
of revenue recognition under license agreements; the timing of new or enhanced
product announcements, introductions, or delays in the introductions, of new or
enhanced versions of the Company's products; changes in pricing policies by the
Company or its competitors; market acceptance of new and enhanced versions of
the Company's products; the cancellation of licenses or maintenance agreements;
the mix of direct and indirect sales; changes in operating expenses; changes in
the Company's strategy; seasonal factors; personnel changes; foreign currency
exchange rates and general economic factors. Based on the Company's operating
history and due to the foregoing factors, quarter to quarter comparisons should
not be relied upon as indicators of future performance. In addition, certain
costs are generally associated with transactions such as the mergers, including
the write off of capitalized software, severance payments, closing of excess
facilities, and disposition of excess equipment. While
 
                                       6
<PAGE>
the costs for the CCT integration have not been currently identified, any such
costs will have an adverse effect on the Company's operating results in the
periods in which they are incurred. In addition, approximately $96 million of
the purchase price paid for HLDS was allocated to in process research and
development and charged to expense in the period ended December 28, 1996 when
the acquisition was consummated. The Company has the right to waive the
condition that the CCT Merger be qualified for pooling of interests accounting
treatment. If the CCT Merger is consummated but fails to qualify for pooling of
interests accounting treatment, then the transaction would be accounted for as a
purchase. Accounting for the CCT Merger as a purchase could result in a
significant intangible asset or a significant charge against results of
operations or both, which could materially and adversely affect future results
of operations.
 
COMPETITION
 
    The Company operates in the highly competitive EDA industry, which continues
to be characterized by falling prices, rapid technological change and new market
entrants. The Company's success is dependent upon its ability to develop
innovative, cost-competitive EDA software products and services, and to bring
them to market in a timely manner. The Company competes with other companies,
including Avant! Corporation, EPIC Design Technology, Inc., Mentor Graphics
Corp., Synopsys, Inc., Viewlogic Systems, Inc. and Zuken-Redac, that sell one or
more competing EDA products, and with actual and potential customers' internal
EDA software development and design services groups as well. Some of the
Company's competitors may have substantially greater financial, marketing and
technological resources than the Company. There can be no assurance that the
Company will be able to compete successfully.
 
    Because the EDA industry is labor-intensive rather than capital-intensive,
the number of the Company's actual and potential competitors is significant. A
potential competitor who possesses the necessary knowledge of electronic circuit
and systems design, production and operation could develop competitive EDA tools
using a moderately priced computer workstation and bring such tools to market
quickly. There can be no assurance that development of competitive products will
not result in a shift of customer preferences away from the Company's products,
resulting in a significant decrease in the sales of the Company's comparable
products which could materially adversely affect the Company's business,
financial condition and results of operations. If the Company is unable to
compete successfully against current and future competitors, the Company's
business, financial condition and results of operations will be materially
adversely affected.
 
    Intense competition in the EDA industry has lowered prices and there can be
no assurance that the Company will not be required to further discount EDA
product prices in the future. Any such discount could have a negative effect on
the profit margins of the discounted product and could have a material adverse
effect on the Company's business, financial condition and results of operation.
 
MANAGEMENT OF GROWTH
 
    The Company has experienced rapid growth that has placed a significant
strain upon its management, operational and financial resources. In connection
with the HLDS Merger and upon consummation of the proposed CCT Merger, the
Company will need to integrate a large number of new personnel, as well as
operational, financial, management control, accounting and reporting systems and
procedures. The Company's ability to manage its growth effectively will require
it to continue to expand its operational, financial and management controls,
accounting and reporting systems and procedures and other internal processes.
There can be no assurance that such factors will not have a material adverse
effect on the Company's business, financial condition and results of operations.
 
                                       7
<PAGE>
DEPENDENCE ON KEY PERSONNEL AND ABILITY TO ATTRACT AND RETAIN PROFESSIONAL STAFF
 
    The Company is dependent upon the efforts and abilities of its senior
management, its research and development staff and a number of other key
management, sales, services, support and technical personnel. The success of the
Company will depend to a large extent upon its ability to retain and continue to
attract qualified technical and other employees. Competition for qualified
personnel in the software industry is intense, and the loss of key employees
could have a material adverse effect on the Company's business, financial
condition and results of operations, particularly if key personnel are
subsequently employed by a competitor. The Company carries key man life
insurance in the amount of $10 million with respect to its President and Chief
Executive Officer, Joseph B. Costello.
 
    In addition, the Company has recently increased its focus on offering
professional services to its customers. The Company's success in its services
business is particularly dependent upon its ability to attract, retain, train
and motivate highly skilled employees, particularly project managers and other
senior technical personnel. There is significant competition for employees with
the skills required to perform the services the Company offers. There can be no
assurance that the Company will be successful in attracting a sufficient number
of highly skilled employees in the future, or that it will be successful in
retaining, training and motivating the employees it is able to attract. Any
inability to do so could impair the Company's ability to adequately manage and
complete its existing projects and to bid for or obtain new projects. If the
Company's employees are unable to achieve expected performance levels, or if the
Company is unable to attract qualified personnel, the Company's business,
financial condition and results of operations could be materially adversely
affected.
 
RISK WITH REGARD TO INTELLECTUAL PROPERTY RIGHTS
 
    The Company relies principally upon trade secrets and copyright laws to
protect its intellectual property rights. In general, the Company seeks to
preserve its trade secrets by licensing (rather than selling) its products, by
using nondisclosure agreements, by limiting access to confidential information
and through other security measures. Despite these precautions, it may be
possible for third parties to copy aspects of the Company's products or to
obtain and use information that the Company regards as proprietary. The Company
is currently engaged in litigation before the United States District Court for
the Northern District of California with Avant! Corporation ("Avant!") and
certain of its employees, wherein the Company alleges misappropriation of the
Company's trade secrets, copyright infringement, conspiracy and other
illegalities. Avant! has filed counterclaims alleging, INTER ALIA, federal and
state antitrust violations. The court has not yet issued a ruling on the
Company's request for a preliminary injunction or on the defendant's
counterclaims against the Company. The Company has a limited number of patents,
and existing copyright laws afford only limited protection. There has been an
increase in the number of patents issued in the United States relating to EDA
software and, accordingly, the risk of patent infringement in the industry can
be expected to increase. In addition, the proprietary rights and laws and
enforcement procedures of certain foreign countries do not protect the Company's
products and intellectual property rights to the same extent as do the laws of
the United States. There can be no assurance that the Company will be able to
protect its proprietary technology, and any failure to do so could have a
material adverse effect on the Company's business, financial condition and
results of operations.
 
POTENTIAL DILUTIVE EFFECT TO STOCKHOLDERS; TRANSACTION EXPENSES AND WRITEOFFS
 
    There can be no assurance that combining the business of the Company with
the businesses of CCT and HLDS, even if achieved in an efficient and effective
manner, will result in combined results of operations and financial condition
superior to what would have been achieved by the Company independently. The
issuance of the Common Stock in connection with the proposed CCT Merger is
likely to have a dilutive effect on the Company's earnings per share. There can
be no assurance that stockholders of the Company would not achieve greater
returns on investment if the CCT Merger was not
 
                                       8
<PAGE>
consummated. In addition, certain costs are generally associated with
transactions such as the mergers, including the write off of capitalized
software, severance payments, closing of excess facilities and disposition of
excess equipment. The Company incurred approximately $4 million of such costs
related to the HLDS Merger in the period ended December 28, 1996. In addition,
approximately $96 million of the HLDS purchase price was allocated to in process
research and development and was charged to expense in the period ended December
28, 1996 when the HLDS Merger was consummated. Such charges adversely affect
operating results of the Company in the period in which they are recorded. The
Company has the right to waive the condition that the CCT Merger be qualified
for pooling of interests accounting treatment. If the CCT Merger is consummated
but fails to qualify for pooling of interests accounting treatment, then the
transaction would be accounted for as a purchase. Accounting for the CCT Merger
as a purchase could result in a significant intangible asset or a significant
charge against results of operations or both, which could materially and
adversely affect future results of operations.
 
VOLATILITY OF STOCK PRICES
 
    The market price of the Common Stock has been and may continue to be
volatile. This volatility may result from a number of factors, including
fluctuations in the Company's quarterly revenues and net income, announcements
of technical innovations or new commercial products by the Company or its
competitors, and market conditions in the EDA, semiconductor,
telecommunications, computer hardware and computer software industries. In
addition, in the event that the CCT Merger is not consummated, the Company's
stock price may be adversely affected. Also, the stock market has experienced
and continues to experience extreme price and volume fluctuations which have
affected the market prices of securities, particularly those of technology
companies, and which have often been unrelated to the operating performance of
the companies. These broad market fluctuations, as well as general economic and
political conditions, may adversely affect the market price of the Company's
Common Stock in future periods.
 
RISKS ASSOCIATED WITH INTERNATIONAL BUSINESS OPERATIONS
 
    Revenues from international operations accounted for approximately one half
of the Company's total revenues for the five fiscal years ended December 28,
1996. The Company expects that international revenues will continue to account
for a significant portion of its total revenues. The Company's international
operations involve a number of risks normally associated with such operations,
including, among others, adoption and expansion of government trade
restrictions, volatile foreign exchange rates, currency conversion risks,
limitations on repatriation of earnings, reduced protection of intellectual
property rights, the impact of possible recessionary environments in economies
outside the United States, longer receivables collection periods and greater
difficulty in accounts receivable collection, difficulties in managing foreign
operations, political and economic instability, unexpected changes in regulatory
requirements and tariffs and other trade barriers. Currency exchange
fluctuations in countries in which the Company conducts business could also
materially adversely affect the Company's business financial condition and
results of operations. The Company enters into foreign currency forward
contracts to hedge the impact of foreign currency fluctuations. Although the
Company attempts to reduce the impact of foreign currency fluctuations,
significant exchange rate movements may have a material adverse effect on the
Company's business, financial condition and results of operations. Furthermore,
there can be no assurance that in the future the Company will be able to
continue to price its products and services internationally in United States
dollars because of changing sovereign restrictions on importation and
exportation of foreign currencies as well as other practical considerations. In
addition, the laws of certain countries do not protect the Company's products
and intellectual property rights to the same extent as do the laws of the United
States. The Company may be required to have United States Department of Commerce
export licenses for shipment of certain of its products outside the United
States. Any failure, delays or other difficulties in obtaining necessary
licenses could have a material adverse effect on business, financial condition
and results of operations. There can be no
 
                                       9
<PAGE>
assurance that the Company will be able to sustain or increase international
revenues or that the foregoing factors will not have a material adverse effect
on the Company's future international revenues and, consequently, on the
Company's overall business, financial condition and results of operations.
 
ANTITAKEOVER PROVISIONS
 
    The Company has adopted a number of provisions that could have antitakeover
effects. In February 1996, the Company's Board of Directors adopted a Share
Purchase Rights Plan, commonly referred to as a "poison pill". In addition, The
Company's Board of Directors has the authority, without further action by the
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.
 
POTENTIAL FUTURE SALES OF SHARES
 
    Sales of a substantial number of shares of Common Stock in the public
market, whether by purchasers in this offering, other stockholders of the
Company, including affiliates of the Company, or former stockholders of CCT and
HLDS following the mergers, could adversely affect the prevailing market price
of the Common Stock, and could impair the Company's future ability to raise
capital through an offering of its equity securities.
 
                                       10
<PAGE>
                                  THE COMPANY
 
    The Company was formed as a result of the merger of SDA Systems, Inc. into
ECAD, Inc. in May 1988. The principal executive offices of the Company are
located at 2655 Seely Road, Building 5, San Jose, California 95134. The
Company's telephone number is (408) 943-1234.
 
                                USE OF PROCEEDS
 
    The proceeds to the Company from the issuance of the 700,000 shares of
Common Stock upon exercise of the Options are estimated to be $2.7 million at
the weighted average exercise price of $3.8823 per share. Estimated expenses of
$21,825 will be payable by the Optionee in connection with registration of this
Offering. The Company expects to use the proceeds of the issuance for working
capital and other general corporate purposes. In addition, the Company may make
one or more acquisitions of complementary technologies, products or businesses
in order to broaden or enhance the Company's current product offerings. Other
than the pending CCT Merger and the HLDS Merger, the Company has no agreements
or commitments for any such acquisitions, and is not currently engaged in any
negotiations with respect to any material acquisitions.
 
    While the Company presently intends to use the proceeds of the issuance as
described in this section, management of the Company has broad discretion to
adjust the application and allocation of the net proceeds in order to address
circumstances and opportunities. Pending use of such proceeds, the net proceeds
of the issuance will be invested by the Company in short-term, interest-bearing,
investment-grade marketable securities.
 
                    DESCRIPTION OF THE PLAN AND THE OPTIONS
 
ADMINISTRATION
 
    The Plan may be administered by the Board of Directors, or by a committee
that currently must consist of at least two directors appointed by the Board of
Directors. The Compensation Committee currently administers the Plan. One or
more of these members may be "Non-Employee Directors" (a director who is
receiving no compensation from the Company other than for service on the Board
of Directors or who does not receive such additional compensation which exceeds
the limits specified in the definition of such terms under Rule 16b-3).
Subsequent references in this section to the "Committee" shall refer to the
Compensation Committee or the Board of Directors, as applicable, unless the
context otherwise requires. The interpretation or construction by the Committee
of any provisions of the Plan or of any option granted under it will be final
and binding on all optionees.
 
ELIGIBILITY
 
    The Plan provides that options may be granted only to such employees,
including officers and directors who are employees of the Company or any parent
or subsidiary thereof and such consultants to the Company as the Committee may
determine. An optionee may hold more than one option, but only on the terms and
subject to the restrictions set forth in the Plan.
 
    Except as otherwise expressly provided in the terms of an individual option
which is a non-statutory stock option, the options may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of an optionee, only by the optionee. Notwithstanding the foregoing,
the person to whom an option is granted may, by delivering written notice to the
Company, in a form satisfactory to the Company, designate a third party who, in
the event of the death of the optionee, shall thereafter be entitled to exercise
the option.
 
                                       11
<PAGE>
    In determining the number of shares to be subject to each option, the
Committee takes into account the duties and responsibilities of the optionee,
the value of the optionee's service, the optionee's present and potential
contributions to the success of the Company and other relevant factors.
 
    The Plan does not provide for a maximum or minimum number of option shares
that could be granted to any one optionee, however, there is a limit on the
aggregate market value of shares subject to all incentive stock options which
are exercisable for the first time in any one calendar year of $100,000.
 
STOCK
 
    The shares issuable upon exercise of the options are shares of the Company's
authorized but unissued or reacquired Common Stock. In the event that any
outstanding option under the Plan for any reason expires or becomes
unexercisable, the shares of Common Stock allocable to the unexercised portion
of such option may again be subject to an option under the Plan.
 
OPTION TERMS
 
    The Committee will determine for each option whether the option is to be an
incentive stock option or a non-qualified stock option. Each option is evidenced
by a grant agreement in such form as the Committee approves and is subject to
the following additional terms and conditions:
 
    NUMBER OF SHARES
 
        Each option states the number of shares to which it pertains.
 
    OPTION PRICE
 
        Each option states the option price, which generally may not be less
    than 100% of the fair market value of the shares of Common Stock on the date
    of the grant. The Committee currently determines such fair market value
    based upon the average of the high and low prices of the Common Stock on the
    date of the grant, as traded on the New York Stock Exchange.
 
    VESTING
 
        Options generally vest and become exercisable over a four-year period;
    25% after one year from the date of the grant and thereafter ratably, on a
    monthly basis, over the remaining three-year period from the date of grant.
 
    EXERCISE AND MEDIUM OF PAYMENT
 
        An option is exercised by giving written notice of exercise to the
    Company, specifying the number of shares of Common Stock to be purchased
    and, receipt of payment by the Company of the purchase price. The option
    price is typically payable by cash or by check, but the Committee may
    authorize the Company to accept (i) the promissory note of the optionee;
    (ii) shares of fully paid Common Stock; or (iii) such other consideration as
    determined by the Committee and as permitted by law.
 
    TERM OF EXERCISE OF OPTIONS
 
        The term of each option is generally ten years from the date of grant or
    such shorter term as may be provided in the option grant.
 
                                       12
<PAGE>
    TERMINATION OF EMPLOYMENT
 
        If an optionee ceases to be employed by the Company or the optionee's
    consultancy with the Company terminates options must be exercised not later
    than thirty days, or such other period of time not exceeding three (3)
    months as is determined by the Committee after such termination and may be
    exercised only to the extent the options were exercisable on the date of
    termination. A specified exercise period and additional vesting may apply in
    the case of death.
 
    ADJUSTMENT UPON CHANGES IN CAPITALIZATION
 
        The number of shares subject to any option, and the number of shares
    issuable under the Plan, are subject to adjustment in the event of a
    recapitalization of the Company's Common Stock. In the event of a proposed
    dissolution or liquidation of the Company, or in the event of a proposed
    sale of all or substantially all of the assets of the Company, or the merger
    of the Company with or into another corporation. The Options will terminate
    immediately prior to the Consummation of such proposed action, unless
    otherwise provided by the Board. The Committee may in its sole discretion
    give each optionee the right immediately to exercise all or any part of the
    optionee's outstanding options, including options that would not otherwise
    then be exercisable. If the Committee permits such acceleration, the
    aggregate fair market value (determined at the time an option is granted) of
    stock with respect to which incentive stock options first become exercisable
    in the year of such transaction or event cannot exceed $100,000. Any
    remaining accelerated incentive stock options must be treated as
    non-qualified stock options.
 
    RIGHTS AS STOCKHOLDER
 
        An optionee has no rights as a stockholder with respect to any shares
    covered by such option until the date of the issuance of a stock certificate
    for such shares.
 
    OTHER PROVISIONS
 
        The option grant agreements authorized under the Plan contain such other
    provisions, including without limitation restrictions upon the exercise of
    the option or the resale of shares acquired upon exercise thereof, as are
    required by law and as the Committee deems advisable.
 
FEDERAL INCOME TAX INFORMATION
 
    NONSTATUTORY STOCK OPTIONS
 
        Nonstatutory stock options generally have the following federal income
    tax consequences:
 
        There are no tax consequences to the optionee or the Company by reason
    of the grant of a nonstatutory stock option. Upon exercise of a nonstatutory
    stock option, the optionee normally will recognize taxable ordinary income
    equal to the excess of the stock's fair market value on the date of exercise
    over the option exercise price. Generally, with respect to employees, the
    Company is required to withhold from regular wages or supplemental wage
    payments an amount based on the ordinary income recognized. Subject to the
    requirement of reasonableness, the provisions of Section 162(m) of the Code
    and the satisfaction of a tax reporting obligation, the Company will
    generally be entitled to a business expense deduction equal to the taxable
    ordinary income realized by the optionee. Upon disposition of the stock, the
    optionee will recognize a capital gain or loss equal to the difference
    between the selling price and the sum of the amount paid for such stock plus
    any amount recognized as ordinary income upon exercise of the option. Such
    gain or loss will be long or short-term depending on whether the stock was
    held for more than one year. Slightly different rules may apply to optionees
    who acquire stock subject to certain repurchase options or who are subject
    to Section 16(b) of the Exchange Act.
 
                                       13
<PAGE>
    POTENTIAL LIMITATION ON COMPANY DEDUCTIONS
 
        As part of the Omnibus Budget Reconciliation Act of 1993, the U.S.
    Congress amended the Code to add Section 162(m), which denies a deduction to
    any publicly held corporation for compensation paid to certain employees in
    a taxable year to the extent that compensation exceeds $1,000,000 for a
    covered employee. It is possible that compensation attributable to stock
    options, when combined with all other types of compensation received by a
    covered employee from the Company, may cause this limitation to be exceeded
    in any particular year.
 
        Certain kinds of compensation, including qualified "performance-based
    compensation," are disregarded for purposes of the deduction limitation. In
    accordance with proposed Treasury regulations issued under Section 162(m),
    compensation attributable to stock options will qualify as performance-based
    compensation, provided that the option is granted by a compensation
    committee comprised solely of "outside directors" and either: (i) the option
    plan contains a per-employee limitation on the number of shares for which
    options may be granted during a specified period, the per-employee
    limitation is approved by the stockholders, and the exercise price of the
    option is no less than the fair market value of the stock on the date of
    grant; or (ii) the option is granted (or exercisable) only upon the
    achievement (as certified in writing by the compensation committee) of an
    objective performance goal established in writing by the compensation
    committee while the outcome is substantially uncertain, and the option is
    approved by stockholders.
 
AMENDMENT OF THE PLAN
 
    The Committee may amend or terminate the Plan from time to time without
approval of the stockholders, provided, however, that stockholder approval is
required for any amendment that increases the number of shares subject to the
Plan (other than in connection with an adjustment upon a change in
capitalization) or makes any change in the designation of the class of optionees
eligible to be granted options. Stockholder approval would also be sought in the
event of any change which requires such approval in order to comply with Rule
16b-3, as currently in effect. However, no action by the Committee or
stockholders may adversely affect any option previously granted under the Plan
without the written consent of the optionee.
 
THE OPTIONS
 
    A total of 700,000 shares are issuable upon exercise of the Options at a
weighted average exercise price of $3.8823. The Options are fully vested.
433,137 of the Options will terminate on July 20, 1998, and 266,863 of the
Options will terminate on April 26, 2003, or earlier in the event of the death
of Joseph B. Costello or the termination of his employment with the Company.
 
                                       14
<PAGE>
                                DIVIDEND POLICY
 
    The Company has never declared or paid cash dividends on the Common Stock.
The Company currently intends to retain all cash for use in the operation and
expansion of its business and does not anticipate paying any cash dividends on
the Common Stock in the foreseeable future. The Company's bank line of credit
contains certain restrictions on the payment of dividends.
 
                              PLAN OF DISTRIBUTION
 
    This Prospectus relates to a total of 700,000 shares of Common Stock, par
value $0.01, which are issuable upon exercise of the Options by the Optionee.
The Options were initially issued by the Company to Joseph B. Costello, the
Company's President and Chief Executive Officer pursuant to the Plan and the
Nonqualified Stock Option Grant Agreement dated July 20, 1988, as amended on
January 22, 1997, and the Nonqualified Stock Option Regrant Agreement dated
April 26, 1993, as amended on January 22, 1997. In accordance with the Options
and the Plan, the Options have been transferred to and may be exercised by the
Optionee from time to time. The Company hereby registers the 700,000 shares of
Common Stock which will be issued upon exercise of the Options. Each Option is
currently exercisable at a weighted average price of $3.8823 per share. The
exercise prices are not necessarily related to the economic value of the
Company's assets, net book value or any other recognized criteria of investment
value. 433,137 of the Options will terminate on July 20, 1998, and 266,863 of
the Options will terminate on April 26, 2003, or earlier in the event of the
termination of employment of Joseph B. Costello with the Company or his death.
 
    The Optionee has agreed to reimburse the Company for all reasonable fees and
expenses incident to the filing of this Prospectus and the accompanying
Registration Statement.
 
    All proceeds from the sale of the shares pursuant to exercise of the Options
will be for the account of the Company.
 
                                 LEGAL MATTERS
 
    The validity of the shares of Common Stock to be offered hereby will be
passed upon for the Company by Cooley Godward LLP, Palo Alto, California. As of
November 8, 1996, certain attorneys at Cooley Godward LLP who have performed
services for the Company own an aggregate of 1,883 shares of Common Stock. In
addition, a partner of Cooley Godward LLP served as Acting General Counsel to
the Company from November 1995 to June 1996.
 
                                    EXPERTS
 
    The audited consolidated financial statements of Cadence Design Systems,
Inc. incorporated by reference in this Prospectus and Registration Statement,
have been audited by Arthur Andersen LLP, independent public accountants, as
indicated in their report with respect thereto, and are included in reliance
upon the authority of said firm as experts in giving said reports.
 
                                       15
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN OR
MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED. THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE SECURITIES TO
WHICH IT RELATES OR AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY SUCH
SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR SOLICITATION IS UNLAWFUL.
NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER
ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE INFORMATION CONTAINED
HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.
 
                              -------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Available Information.....................................................     2
Incorporation of Certain Documents by Reference...........................     2
Risk Factors..............................................................     4
The Company...............................................................    11
Use of Proceeds...........................................................    11
Description of the Plan and the
  Options.................................................................    11
Dividend Policy...........................................................    15
Plan of Distribution......................................................    15
Legal Matters.............................................................    15
Experts...................................................................    15
</TABLE>
 
                                 700,000 SHARES
 
                                 CADENCE DESIGN
                                 SYSTEMS, INC.
 
                                  COMMON STOCK
                           (PAR VALUE $.01 PER SHARE)
 
                              -------------------
 
                                     [LOGO]
                              -------------------
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
    The following table sets forth the expenses payable by the Company in
connection with the sale, issuance and distribution of the securities being
registered. All amounts are estimates except the SEC registration fee.
 
<TABLE>
<S>                                                                 <C>
SEC Registration Fee..............................................  $     825
Printing and Engraving Expenses...................................  $   1,000
Legal Fees and Expenses...........................................  $  10,000
Accounting Fees and Expenses......................................  $   5,000
Miscellaneous.....................................................  $   5,000
                                                                    ---------
    Total.........................................................  $  21,825
                                                                    ---------
                                                                    ---------
</TABLE>
 
ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.
 
    As permitted by Section 145 of the Delaware General Corporation Law, the
Registrant's Certificate of Incorporation includes a provision that eliminates
the personal liability of its directors for monetary damages for breach or
alleged breach of their duty of care. The Registrant also maintains a limited
amount of director and officer insurance. In addition, as permitted by Section
145 of the Delaware General Corporation Law, the Bylaws of the Registrant
provide that: (i) the Registrant is required to indemnify its directors,
officers and employees, and persons serving in such capacities in other business
enterprises (including, for example, subsidiaries of the Registrant) at the
Registrant's request, to the fullest extent permitted by Delaware law, including
those circumstances in which indemnification would otherwise be discretionary;
(ii) the Registrant is required to advance expenses, as incurred, to such
directors, officers and employees in connection with defending a proceeding
(except that it is not required to advance expenses to a person against whom the
Registrant brings a claim for breach of the duty of loyalty, failure to act in
good faith, intentional misconduct, knowing violation of law or deriving an
improper personal benefit); (iii) the rights conferred in the Bylaws are not
exclusive and the Registrant is authorized to enter into indemnification
agreements with such directors, officers and employees; (iv) the Registration is
required to maintain director and officer liability insurance to the extent
reasonably available; and (v) the Registrant may not retroactively amend the
Bylaw provision in a way that is adverse to such directors, officers and
employees.
 
    The Registrant's policy is to enter into indemnity agreements with each of
its executive officers and directors that provide the maximum indemnity allowed
to officers and directors by Section 145 of the Delaware General Corporation Law
and the Bylaws, as well as certain additional procedural protections. In
addition, the indemnity agreements provide that officers and directors will be
indemnified to the fullest possible extent not prohibited by law against all
expenses (including attorney's fees) and settlement amounts paid or incurred by
them in any action or proceeding, including any derivative action by or in the
right of the Registrant, on account of their services as directors or officers
of the Registrant or as directors or officers of any other company or enterprise
when they are serving in such capacities at the request of the Registrant. No
indemnity will be provided, however, to any director or officer on account of
conduct that is adjudicated to be knowingly fraudulent, deliberately dishonest
or willful misconduct. The indemnity agreements also provide that no
indemnification will be available if a final court adjudication determines that
such indemnification is not lawful, or in respect of any accounting of profits
made from the purchase or sale of securities of the Registrant in violation of
Section 16(b) of the Exchange Act.
 
    The indemnification provision in the Bylaws, and the indemnity agreements
entered into between the Registrant and its officers or directors, may be
sufficiently broad to permit indemnification of the Registrant's officers and
directors for liability arising under the Securities Act.
 
                                      II-1
<PAGE>
ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
    (A) EXHIBITS
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                      EXHIBIT TITLE
- ----------  ----------------------------------------------------------------------------------
<C>         <S>
  2.1*      Agreement and Plan of Merger and Reorganization dated as of October 3, 1996, among
              the Company, Harbor Acquisition Sub, Inc., and High Level Design Systems, Inc.
  2.2**     Agreement and Plan of Merger and Reorganization dated as of October 28, 1996,
              among the Company, Wyoming Acquisition Sub, Inc., and Cooper & Chyan Technology,
              Inc.
  4.1       Nonqualified Stock Option Grant dated July 20, 1988
  4.2       Nonqualified Stock Option Regrant Agreement dated April 26, 1993
  4.3       Amendment One to Nonqualified Stock Option Grant of July 20, 1988, dated January
              22, 1997
  4.4       Amendment One to Nonqualified Stock Option Grant of April 26, 1993, dated January
              22, 1997
  4.5       1987 Stock Option Plan, as adopted April 24, 1987, and as amended May 4, 1993 and
              August 1, 1996
  4.6***    Form of Specimen Certificate for Registrant's Common Stock
  4.7****   Rights Agreement, dated as of February 9, 1996, between the Company and Harris
              Trust and Savings Bank
  5.1       Opinion of Cooley Godward LLP
 23.1       Consent of Arthur Andersen LLP
 23.2       Consent of Cooley Godward LLP (included in Exhibit 5.1)
 24.1       Power of Attorney (included on page II-4 of Registration Statement)
</TABLE>
 
- ------------------------
 
*   Incorporated by reference to Exhibit 2.1 to the Company's Form 8-K dated
    November 7, 1996.
 
**  Incorporated by reference to Exhibit 2.2 to the Company's Form 8-K dated
    November 7, 1996.
 
*** Incorporated by reference to Exhibit 4.01 to the Company's Form S-4
    Registration Statement filed in 1991.
 
****Incorporated by reference to Exhibit 1 to the Company's Current Report on
    Form 8-K dated February 9, 1996.
 
ITEM 17.  UNDERTAKINGS.
 
    The undersigned 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 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;
 
    (2) That, for the purpose of determining any liability under the Securities
Act, each post-effective amendment that contains a form of prospectus 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; and
 
    (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.
 
                                      II-2
<PAGE>
    (4) For purposes of determining any liability under the Securities Act of
1933, the information omitted from the form of prospectus filed as part of this
registration statement in reliance upon Rule 430A and contained in a form of
prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h)
under the Securities Act shall be deemed to be part of this registration
statement as of the time it was declared effective.
 
    (5) For the purpose of determining any liability under the Securities Act of
1933, each post-effective amendment that contains a form of prospectus 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.
 
    The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of
1934) 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.
 
    Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
registrant pursuant to provisions described in Item 15, or otherwise, the
registrant has been advised 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. 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 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.
 
                                      II-3
<PAGE>
                                   SIGNATURES
 
    Pursuant to the requirements of the Securities Act of 1933, 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 San Jose, State of California, on the 28th day of
January, 1997.
 
                                          Cadence Design Systems, Inc.
 
                                          By:       /s/ JOSEPH B. COSTELLO
                                             -----------------------------------
 
                                              Joseph B. Costello
 
                                              President and Chief Executive
                                              Officer
 
                               POWER OF ATTORNEY
 
    KNOW ALL PERSONS BY THESE PRESENT, that each person whose signature appears
below constitutes and appoints Joseph B. Costello, H. Raymond Bingham and R.L.
Smith McKeithen, and each or any of them, his true and lawful attorney-in-fact
and agent, with full power of substitution and resubstitution, for him and in
his name, place and stead, in any and all capacities, to sign any and all
amendments (including post-effective amendments) to this Registration Statement,
and to file the same, with all exhibits thereto, and other documents in
connection therewith, with the Securities and Exchange Commission, granting unto
said attorneys-in-fact and agents, and each of them, full power and authority to
do and perform each and every act and thing requisite and necessary to be done
in connection therewith, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, or their or his substitutes or
substitute, may lawfully do or cause to be done by virtue hereof.
 
    Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons on behalf
of the Registrant and in the capacities and on the dates indicated.
 
<TABLE>
<CAPTION>
                SIGNATURE                                         TITLE                                DATE
- ------------------------------------------  --------------------------------------------------  ------------------
 
<C>                                         <S>                                                 <C>
                    /s/ JOSEPH B.
                 COSTELLO                   President, Chief Executive Officer and Director     January 28, 1997
- ------------------------------------------    (Principal Executive Officer)
            Joseph B. Costello
 
               /s/ H. RAYMOND BINGHAM
- ------------------------------------------  Executive Vice President, Chief Financial Officer   January 28, 1997
            H. Raymond Bingham                and Secretary (Principal Financial Officer)
 
                      /s/ WILLIAM
                  PORTER                    Vice President, Corporate Controller and Assistant  January 28, 1997
- ------------------------------------------    Secretary (Principal Accounting Officer)
              William Porter
 
                       /s/ CAROL
                  BARTZ
- ------------------------------------------  Director                                            January 28, 1997
               Carol Bartz
</TABLE>
 
                                      II-4
<PAGE>
<TABLE>
<CAPTION>
                SIGNATURE                                         TITLE                                DATE
- ------------------------------------------  --------------------------------------------------  ------------------
 
<C>                                         <S>                                                 <C>
                    /s/ HENRY E.
                 JOHNSTON
- ------------------------------------------  Director                                            January 28, 1997
            Henry E. Johnston
 
               /s/ DR. LEONARD Y. W.
                   LIU
- ------------------------------------------  Director                                            January 28, 1997
          Dr. Leonard Y. W. Liu
 
                    /s/ DONALD L.
                  LUCAS
- ------------------------------------------  Director                                            January 28, 1997
             Donald L. Lucas
 
- ------------------------------------------  Director                                            January   , 1997
   Dr. Alberto Sangiovanni-Vincentelli
 
                    /s/ GEORGE M.
                 SCALISE
- ------------------------------------------  Director                                            January 28, 1997
            George M. Scalise
 
               /s/ DR. JOHN B. SHOVEN
- ------------------------------------------  Director                                            January 28, 1997
            Dr. John B. Shoven
 
                /s/ JAMES E. SOLOMON
- ------------------------------------------  Director                                            January 28, 1997
             James E. Solomon
</TABLE>
 
                                      II-5
<PAGE>
                               INDEX TO EXHIBITS
 
<TABLE>
<CAPTION>
 EXHIBIT
  NUMBER                                            EXHIBIT TITLE
- ----------  ----------------------------------------------------------------------------------------------
<C>         <S>                                                                                             <C>
  2.1*      Agreement and Plan of Merger and Reorganization dated as of October 3, 1996, among the
              Company, Harbor Acquisition Sub, Inc., and High Level Design Systems, Inc.
  2.2**     Agreement and Plan of Merger and Reorganization dated as of October 28, 1996, among the
              Company, Wyoming Acquisition Sub, Inc., and Cooper & Chyan Technology, Inc.
  4.1       Nonqualified Stock Option Grant dated July 20, 1988
  4.2       Nonqualified Stock Option Regrant Agreement dated April 26, 1993
  4.3       Amendment One to Nonqualified Stock Option Grant of July 20, 1988, dated January 22, 1997
  4.4       Amendment One to Nonqualified Stock Option Grant of April 26, 1993, dated January 22, 1997
  4.5       1987 Stock Option Plan, as adopted April 24, 1987, and as amended May 4, 1993 and August 1,
              1996
  4.6***    Form of Specimen Certificate for Registrant's Common Stock
  4.7****   Rights Agreement, dated as of February 9, 1996, between the Company and Harris Trust and
              Savings Bank
  5.1       Opinion of Cooley Godward LLP
 23.1       Consent of Arthur Andersen LLP
 23.2       Consent of Cooley Godward LLP (included in Exhibit 5.1)
 24.1       Power of Attorney (included on page II-4 of Registration Statement)
</TABLE>
 
- ------------------------
 
*   Incorporated by reference to Exhibit 2.1 to the Company's Form 8-K dated
    November 7, 1996.
 
**  Incorporated by reference to Exhibit 2.2 to the Company's Form 8-K dated
    November 7, 1996.
 
*** Incorporated by reference to Exhibit 4.01 to the Company's Form S-4
    Registration Statement filed in 1991.
 
****Incorporated by reference to Exhibit 1 to the Company's Current Report on
    Form 8-K dated February 9, 1996.
 
                                      II-6

<PAGE>

                                                                 Exhibit 4.1

                                                              Option No. 676

                         CADENCE DESIGN SYSTEMS, INC.

                       NONQUALIFIED STOCK OPTION GRANT


   CADENCE DESIGN SYSTEMS, INC., a Delaware corporation (the "Company"), 
hereby grants as of July 20, 1988 ("Date of Grant") to Joseph B. Costello 
(the "Optionee"), a nonqualified option ("Option") to purchase a total of
192,505 shares of Common Stock of the Company (the "Shares"), at an exercise
price of $8.6875 per share ("Exercise Price") subject to the terms, 
definitions and provisions of this Option and the Company's 1987 Stock Option 
Plan (the "Plan") which is incorporated herein by reference. The terms 
defined in the Plan shall have the same defined meanings herein.

   1.  NATURE OF THE OPTION.  This Option is a nonqualified stock option and 
is not intended to qualify as an incentive stock option as defined in 
Section 422A of the Internal Revenue Code of 1986, as amended (the "Code").

   2.  EXERCISE OF OPTION.  This Option shall be exercisable during its term 
in accordance with the provisions of Section 9 of the Plan as follows:

       (i)  RIGHT TO EXERCISE.

            (a)  This Option shall become exercisable as to 25% of the Shares 
one year after the Date of Grant and as to an additional 1/48th of the Shares 
per month thereafter.

            (b)  This Option may not be exercised for a fraction of a share.

            (c)  In the event of Optionee's death, disability or other 
termination of employment, the exercisability of the Option is governed by 
Section 9 of the Plan and Section 5 and 6 below.

     (ii)  METHOD OF EXERCISE.  This Option shall be exercisable by delivery
to the Company of an executed written notice in the form attached hereto, or 
in such other form as may be approved by the Company, which shall state the 
election to exercise the option, the number of Shares in respect of which the 
Option is being exercised, and such other representations and agreements as 
to the holder's investment intent with respect to such shares of Common Stock 
as may be required by the Company pursuant to the provisions of the Plan. 
Such written notice shall be signed  by the Optionee and shall be delivered 
in person or by certified mail to the Secretary of the Company and shall be 
accompanied by payment of the Exercise Price.


<PAGE>

   3.  METHOD OF PAYMENT.  Payment of the Exercise Price shall be made as 
follows:  (i) by cash or check; or (ii) by delivery of an irrevocable written 
commitment from a broker-dealer that is a member in good standing of the 
National Association of Securities Dealers ("NASD Dealer") to deliver the 
exercise price directly to the Company upon receipt of the Shares or, in the 
case of a margin loan, upon receipt of a copy of a notice of exercise of this 
Option.

   4.  RESTRICTIONS ON EXERCISE.  This Option may not be exercised unless 
such exercise, the issuance of the Shares upon such exercise and the method 
of payment of consideration for the Shares are in compliance with (i) the 
Securities Act of 1933, (ii) all applicable state securities laws, (iii) all 
other applicable federal and state laws and regulations and (iv) the rules of 
any stock exchange or national market system upon which the Shares may then 
be listed, as such laws, regulations and rules are in effect on the date of 
exercise. Although the Plan is registered with the Securities and Exchange 
Commission as of the Date of Grant, Optionee understands that so long as 
Optionee remains an affiliate of the Company, the Shares may be publicly 
resold only if they are included in the resale prospectus filed with the 
registration statement pertaining to the Plan. The Company will take all 
actions required to include the Shares in such resale prospectus prior to the 
first date on which this Option becomes exercisable. As a condition to the 
exercise of this Option, the Company may require Optionee to make any 
representation and warranty to the Company as may be required by any 
applicable law or regulation.

   5.  TERMINATION OF STATUS AS AN EMPLOYEE.  If Optionee ceases to serve as 
an Employee, he may, but only within thirty (30) days after the date he 
ceases to be an Employee of the Company, exercise this Option to the extent 
that he was entitled to exercise it on the date of such termination. To the 
extent that he was not entitled to exercise this Option on the date of such 
termination, or if he does not exercise this Option within the time specified 
herein, the Option shall terminate.

   6.  DEATH OF OPTIONEE.  In the event of the death of Optionee:

            (i)  During the term of this Option and while an Employee of the 
Company and having been in Continuous Status as an Employee since the date of 
grant of the Option, the Option may be exercised, at any time within three 
(3) months following the date of death, by Optionee's estate or by a person 
who acquired the right to exercise the Option by bequest or inheritance, but 
only to the extent of the right to exercise

                                     - 2 -

<PAGE>

that would have accrued had Optionee continued living three (3) months after 
the date of death; or

           (ii)  within one (1) month after the termination of Optionee's 
Continuous Status as an Employee, the Option may be exercised, at any time 
within three (3) months following the date of death, by Optionee's estate or 
by a person who acquired the right to exercise the Option by bequest or 
inheritance, but only to the extent that the right to exercise had accrued at 
the date of termination.

   7.  NON-TRANSFERABILITY OF OPTION.  This Option may not be transferred in 
any manner otherwise than by will or by the laws of descent or distribution 
and may be exercised during the lifetime of Optionee only by him.  The terms 
of this Option shall be binding upon the executors, administrators, heirs,
successors and assigns of the Optionee.

   8.  TERM OF OPTION.  Notwithstanding any other provision of this Option, 
this Option may not be exercised more than ten years from the Date of Grant 
of this Option, and may be exercised during such term only in accordance with 
the Plan and the terms of this Option.

   9.  TAX CONSEQUENCES.  Set forth below is a brief summary as of the date 
of this Option of some of the federal and California tax consequences of 
exercise of this Option and disposition of the Shares. THIS SUMMARY IS 
NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO 
CHANGE. OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION 
OR DISPOSING OF THE SHARES.

            (i)  EXERCISE OF NONQUALIFIED STOCK OPTION.  If, on the date the 
Option is exercised, the fair market value of the Shares is greater than the 
Exercise Price, Optionee will then incur a regular federal income tax 
liability and a California income tax liability; provided, however, that if 
Optionee is and remains subject to Section 16(b) of the Securities Exchange 
Act of 1934 ("Section 16(b)"), then such tax liability will accrue six months 
after exercise ("the Lapse Date") unless Optionee elects to incur such 
liability on the date of exercise by filing an election under Section 83(b) 
of the Code ("Section 83(b)") within 30 days after exercise. If Optionee files a
Section 83(b) election or if Section 16(b) is inapplicable on the date of 
exercise, Optionee will be treated as having received, on the date of 
exercise, compensation income (taxable at ordinary income tax rates) equal to 
the excess, if any, of the fair market value of the Shares on the date of 
exercise over the Exercise Price. If no Section 83(b) election is filed and 
Section 16(b) is and remains applicable, the Optionee will be treated as 
having received, on the Lapse

                                     - 3 -

<PAGE>

Date, compensation income (taxable at ordinary income tax rates) equal to the 
excess, if any, of the fair market value of the Shares on the Lapse Date over 
the Exercise Price. The Company will be required to withhold from Optionee's
compensation or collect from Optionee and pay to the applicable taxing 
authorities such amounts as are required by applicable federal and state tax 
laws.

           (ii)  DISPOSITION OF SHARES.  If the Shares are held for at least 
one year, any gain or loss realized on disposition of the Shares will be 
treated as long term capital gain or loss for federal and California income 
tax purposes. As of the Date of Grant, capital gains are taxed at the same 
rates as ordinary income for federal and California tax purposes. Capital 
gains, however, may be offset by capital losses.

                                         CADENCE DESIGN SYSTEMS, INC.
                                         a Delaware corporation


                                         By:  /s/ illegible
                                             ----------------------------

                                         Its: VP Finance/Admin.
                                             ----------------------------

   Optionee acknowledges receipt of a copy of the Plan, a copy of which is 
annexed hereto, and represents that he is familiar with the terms and 
provisions thereof, and hereby accepts this Option subject to all of the 
terms and provisions thereof. Optionee hereby agrees to accept as binding, 
conclusive and final all decisions or interpretations of the Board upon any 
questions arising under the Plan. Optionee acknowledges that there may be 
adverse tax consequences upon exercise of this Option or disposition of the 
Shares and that Optionee should consult a tax adviser prior to such exercise 
or disposition.

Dated:      10/23/88
      ---------------------


                                          /s/ Joseph B. Costello
                                         --------------------------------
                                         Optionee

                                    - 4 -



<PAGE>

                                                               Option No. RP1247

                             CADENCE DESIGN SYSTEMS, INC.

                     NONQUALIFIED STOCK OPTION REGRANT AGREEMENT

    CADENCE DESIGN SYSTEMS, INC., a Delaware corporation (the "Company"),
hereby grants as of 04/26/93 ("Date of Grant") to JOSEPH B. COSTELLO (the
"Optionee") to purchase a total of 500000 shares of Common Stock of the Company
(the "Shares"), at an exercise price of $8.8125 per share ("Exercise Price")
subject to the terms, definitions and provisions of this Option and the
Company's 1987 Stock Option Plan (the "Plan") which is incorporated herein by
reference.  The terms defined in the Plan shall have the same defined meanings
herein.  Vesting of this Option shall commence on 04/26/93 ("Vesting
Commencement Date").

    1.   DATE OF THE OPTION.  This Option is a nonqualified stock option and is
not intended to qualify as an incentive stock option as defined in Section 422A
of the Internal Revenue Code of 1986, as amended (the "Code").

    2.   EXERCISE OF OPTION.  This Option shall be exercisable during its term
in accordance with the provisions of Section 9 of the Plan as follows:

         (i)  RIGHT TO EXERCISE.

              (a)  This option shall become exercisable as to 33% of the Shares
one year after the Vesting Commencement Date and as to an additional 1/36th of
the Shares per month thereafter.

              (b)  This Option may not be exercised for a fraction of a share.

              (c)  In the event of Optionee's death, disability or other
termination of employment, the exercisability of the Option is governed by
Section 9 of the Plan and Section 5 and 6 below.

         (ii) METHOD OF EXERCISE.  This Option shall be exercisable by delivery
to the Company of an executed written notice as approved by the Company, which
shall state the election to exercise the option, the number of Shares in respect
of which the Option is being exercised, and such other representations and
agreements as to the holder's investment intent with respect to such shares of
Common Stock as may be required by the Company pursuant to the provisions of the
Plan.  Such written notice shall be signed by the Optionee and shall be
delivered in person or by certified mail to the Secretary of the Company and
shall be accompanied by payment of the Exercise Price.

<PAGE>

    3.   METHOD OF PAYMENT.  Payment of the Exercise Price shall be made as
follows:  (i) by cash or check; or (ii) by delivery of an irrevocable written
commitment from a broker-dealer approved by the Company that is a member in good
standing of the New York Stock Exchange ("NYSE DEALER") to deliver the exercise
price directly to the Company upon receipt of the Shares or, in the case of a
margin loan, upon receipt of a copy of the notice of exercise of this Option.

    4.   RESTRICTIONS ON EXERCISE.  This Option may not be exercised unless
such exercise, the issuance of the Shares upon such exercise and the method of
payment of consideration for the Shares are in compliance with (i) the
Securities Act of 1933, (ii) all applicable state securities laws, (iii) all
other applicable federal and state laws and regulations and (iv) the rules of
any stock exchange or national market system upon which the Shares may then be
listed, as such laws, regulations and rules are in effect on the date of
exercise.  As a condition to the exercise of this Option, the Company may
require Optionee to make any representation and warranty to the Company as may
be required by any applicable law or regulation.

    5.   TERMINATION OF STATUS AS AN EMPLOYEE.  If Optionee ceases to serve as
an Employee, Optionee may, but only within thirty (30) days after the date
Optionee ceases to be an Employee of the Company, exercise this Option to the
extent that Optionee was entitled to exercise it on the date of such
termination.  To the extent that Optionee was not entitled to exercise this
Option on the date of such termination, or if Optionee does not exercise this
Option within the time specified herein, the Option shall terminate.

    6.   DEATH OF OPTIONEE.  In the event of the death of Optionee:

         (i)  During the term of this Option and while an Employee of the
Company and having been in Continuous Status as an Employee since the date of
grant of the Option, the Option may be exercised, at any time within three (3)
months following the date of death, by Optionee's estate or by a person who
acquired the right to exercise the Option by bequest or inheritance, but only to
the extent of the right to exercise that would have accrued had Option 
continued living three (3) months after the date of death; or

         (ii) Within one (1) month after the termination of Optionee's
Continuous Status as an Employee, the Option may be exercised, at any time
within three (3) months following the date of death, by Optionee's estate or by
a person who acquired the right to exercise the Option by bequest or
inheritance, but only to the extent that the right to exercise had accrued at
the date of termination.

    7.   NON-TRANSFERABILITY OF OPTION.  This Option may not be transferred in
any manner otherwise than by will or by the laws or


                                         -2-

<PAGE>

descent or distribution and may be exercised during the lifetime of Optionee
only by Optionee.  The terms of this Option shall be binding upon the executors,
administrators, heirs, successors and assigns of the Optionee.

    8.   TERM OF OPTION.  Notwithstanding any other provision of this Option,
this Option may not be exercised more than ten years from the Date of grant of
this Option, and may be exercised during such term only in accordance with the
Plan and the terms of this Option.

    9.   TAX CONSEQUENCES.  Set forth below is a brief summary as of the date
of this Option of some of the federal and California tax consequences of
exercise of this Option and disposition of the Shares.  THIS SUMMARY IS
NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. 
OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING
OF THE SHARES.

         (i)  EXERCISE OF NONQUALIFIED STOCK OPTION.  If, on the date the
Option is exercised, the fair market value of the Shares is greater than the
Exercise Price, Optionee will then incur a regular federal income tax liability
and a California income tax liability.  Optionee will be treated as having then
received compensation income (taxable at ordinary income tax rates) equal to the
excess of the fair market value of the Shares on the date of exercise over the
Exercise Price.  The Company will be required to withhold from Optionee's
compensation or collect from Optionee and pay to the applicable taxing
authorities such amounts as are required by applicable federal and state tax
laws.

         (ii) DISPOSITION OF SHARES.  If the Shares are held for at least one
year, any gain or loss realized on disposition of the Shares will be treated as
long term capital gain or loss for federal and California income tax purposes. 
As of the Date of Grant, capital gains are taxed at the same rates as ordinary
income for federal and California tax purposes.  Capital gains, however, may be
offset by capital losses.



                                            CADENCE DESIGN SYSTEMS, INC.
                                            a Delaware corporation



                                            By: /s/ illegible
                                                ------------------------------
                                            Its:Vice President and
                                                 -----------------------------
                                                 General Counsel
                                                 -----------------------------



                                         -3-

<PAGE>



         Optionee represents that she/he is familiar with the terms and
provisions, and hereby accepts this Option subject to all of the terms and
provisions thereof.  Optionee acknowledges that in electing to have stock
options previously granted under the Plan cancelled or reduced in number 
in exchange for the Options granted under this Agreement, the Optionee is not
receiving an agreement or guaranty for Optionee's continued employment or a
change in the terms, including the at-will nature of Optionee's employment. 
Optionee hereby agrees to accept as binding, conclusive and final all decisions
or interpretations of the Board upon any questions arising under the Plan. 
Optionee acknowledges that there may be adverse tax consequences upon exercise
of this Option or disposition of the Shares and that Optionee should consult a
tax adviser prior to such exercise or disposition.


Dated:          7/10/93
         -------------------------

                                             /s/ Joseph B. Costello
                                            -----------------------------------
                                            Optionee





                                         -4-

<PAGE>

                                                                     EXHIBIT 4.3

                                              Original Grant Date: July 20, 1988
                                                              Option Number: 676
                                              Original Number of Shares: 192,505
                                           Shares Remaining Unexercised: 192,505


                                AMENDMENT ONE TO
                      NONQUALIFIED STOCK OPTION AGREEMENT
                                JANUARY 22, 1997


Joseph B. Costello, Optionee:

     Effective this date, Cadence Design Systems, Inc. (the "Company") has 
amended the Nonqualified Stock Option identified above (the "Option"), which 
was granted to you as optionee under the Company's 1987 Stock Option Plan 
(the "Plan"). The changes to the terms of the Option contained in this 
Amendment One are mutually agreed to by you and the Company and are set forth 
below:

     1.  Section 7 of the Option is deleted in its entirety and replaced with 
the following:

         7.  TRANSFERABILITY OF OPTION.  This Option is not transferable, 
         except (i) by will or by the laws of descent and distribution, (ii) by
         written designation which takes effect upon your death, (iii) by 
         written instruction, in a form accepted by the Company, to your spouse,
         children, stepchildren, or grandchildren (whether adopted or natural),
         to a trust created solely for the benefit of you and the foregoing 
         persons, or (iv) to your former spouse (if transfer is pursuant to a 
         judicial decree dissolving your marriage). During your life this Option
         is exercisable only by you or a transferee satisfying the above 
         conditions. The right of a transferee to exercise the transferred 
         portion of this Option after your termination of employment with the 
         Company shall terminate in accordance with your right of exercise under
         Section 5 of this Option, and after your death under Section 6 of this
         Option (treating the transferee as a person who acquired the right to 
         exercise this Option by bequest or inheritance. The terms of this 
         Option shall be binding upon the transferees, executors, 
         administrators, heirs, successors, and assigns of the Optionee.



                                       1.

<PAGE>

     Except as Section 7 has been specifically amended and modified herein, 
the Option shall continue in force and effect pursuant to its terms, as 
originally granted, subject to the provisions of the Plan.

     Dated the 22nd day of January, 1997.

                                        Very truly yours,

                                        CADENCE DESIGN SYSTEMS, INC.


                                        By: /s/ H. Raymond Bingham
                                           -------------------------------------




     The undersigned Optionee acknowledges receipt of the foregoing Amendment 
and understands and agrees that the rights and liabilities with respect to 
the Option described therein are now contained in the Option, this Amendment One
and the Plan. Copies of the Option and the Plan have previously been received by
Optionee.


                                         /s/ Joseph B. Costello
                                        ----------------------------------------
                                               Optionee's signature


                                        Address:    ----------------------------
                                                    ----------------------------



                                       2.


<PAGE>

                               Exhibit 4.4       

                                            Original Grant Date: April 26, 1993
                                                          Option Number: RP1247
                                             Original Number of Shares: 500,000
                                          Shares Remaining Unexercised: 500,000



                                AMENDMENT ONE TO 
                   NONQUALIFIED STOCK OPTION REGRANT AGREEMENT
                                January 22, 1997


Joseph B. Costello, Optionee:

          Effective this date, Cadence Design Systems, Inc. (the "Company") 
has amended the Nonqualified Stock Option identified above (the "Option"), 
which was granted to you as optionee under the Company's 1987 Stock Option 
Plan (the "Plan"). The changes to the terms of the Option contained in this 
Amendment One are mutually agreed to by you and the Company and are set forth 
below;

          1. Section 7 of the Option is deleted in its entirety and replaced 
with the following:

               7. TRANSFERABILITY OF OPTION. This Option is not transferable, 
               except (i) by will or by the laws of descent and distribution, 
               (ii) by written designation which takes effect upon your death, 
               (iii) by written instruction, in a form accepted by the Company,
               to your spouse, children, stepchildren, or grandchildren 
               (whether adopted or natural), to a trust created solely for 
               the benefit of you and the foregoing persons, or (iv) to your 
               former spouse (if transfer is pursuant to a judicial decree 
               dissolving your marriage). During your life this Option is 
               exercisable only by you or a transferee satisfying the above 
               conditions. The right of a transferee to exercise the 
               transferred portion of this Option after your termination of 
               employment with the Company shall terminate in accordance with 
               your right of exercise under Section 5 of this Option, and after
               your death under Section 6 of this Option (treating the 
               transferee as a person who acquired the right to exercise this 
               Option by bequest or inheritance. The terms of this Option shall 
               be binding upon the transferees, executors, administrators, 
               heirs, successors, and assigns of the Optionee.


<PAGE>

          Except as Section 7 has been specifically amended and modified 
herein, the Option shall continue in force and effect pursuant to its terms, 
as originally granted, subject to the provisions of the Plan.

          Dated the 22nd day of January, 1997.

                                                 Very truly yours,

                                                 CADENCE DESIGN SYSTEMS, INC.

                                                 By: /s/ H. Raymond Bingham
                                                    ---------------------------

          The undersigned Optionee acknowledges receipt of the foregoing 
Amendment and understands and agrees that the rights and liabilities with 
respect to the Option described therein are now contained in the Option, this 
Amendment One and the Plan. Copies of the Option and the Plan have previously 
been received by Optionee.

                                                         Joseph B. Costello
                                                     --------------------------
                                                        Optionee's signature


                                                  Address: ____________________
                                                           ____________________





                                       2


     

<PAGE>

                         CADENCE DESIGN SYSTEMS, INC.

                           1987 STOCK OPTION PLAN
                          AS ADOPTED APRIL 24, 1987
                            AS AMENDED MAY 4, 1993
          AS AMENDED AUGUST 1, 1996, 1996 TO BECOME EFFECTIVE AUGUST 15, 1996


     1.   PURPOSES OF THE PLAN.  The purposes of this Stock Option Plan are 
to attract and retain the best available personnel for positions of 
substantial responsibility, to provide additional incentive to the employees 
of the Company and any parent or subsidiary corporations, and to promote the 
success of the Company's business.

          Options granted hereunder may be either "incentive stock options," 
as defined in Section 422 of the Internal Revenue Code of 1986, as amended, 
or "non-statutory stock options," at the discretion of the Board and as 
reflected in the terms of the written option agreement.

          Awards granted under this Plan shall be exempt from the 
requirements of Section 162(m) of the Code until the date of the Company's 
1997 Annual Meeting of Stockholders or until the Plan is materially amended, 
whichever first occurs.

     2.   DEFINITIONS.  As used herein, the following definitions shall apply:

          (a)  "BOARD" shall mean the Committee, if one has been appointed, 
or the Board of Directors of the Company, if no Committee is appointed.

          (b)  "CODE" shall mean the Internal Revenue Code of 1986, as 
amended.

          (c)  "COMMON STOCK" shall mean the Common Stock of the Company.

          (d)  "COMPANY" shall mean CADENCE DESIGN SYSTEMS, INC., a Delaware 
corporation.

          (e)  "COMMITTEE" shall mean the Committee appointed by the Board of 
Directors in accordance with paragraph (a) of Section 4 of the Plan, if one 
is appointed.

          (f)  "CONSULTANT" shall mean any consultants, independent 
contractors or advisers (provided that such persons render bona fide services 
not in connection with the offering and sale of securities in capital raising 
transactions) rendering services to the Company or a Parent or Subsidiary.

          (g)  "CONTINUOUS STATUS AS AN EMPLOYEE OR CONSULTANT" shall mean 
the absence of any interruption of termination of service, whether as an 
Employee or Consultant.


                                      1.
<PAGE>

Continuous Status as an Employee or Consultant shall not be considered 
interrupted in the case of sick leave, military leave, or any other leave of 
absence.

          (h)  "EMPLOYEE" shall mean any person, including officers and 
directors, employed by the Company or any Parent or Subsidiary of the 
Company.  The payment of a director's fee or other compensation paid solely 
on account of service as a director by the Company shall not be sufficient to 
constitute "employment" by the Company.

          (i)  "INCENTIVE STOCK OPTION" shall mean an Option intended to 
qualify as an incentive stock option within the meaning of Section 422 of the 
Internal Revenue Code of 1986, as amended.

          (j)  "OPTION" shall mean a stock option granted pursuant to the 
Plan.

          (k)  "OPTIONED STOCK" shall mean the Common Stock subject to an 
Option.

          (l)  "OPTIONEE" shall mean an Employee or Consultant who receives an 
Option.

          (m)  "PARENT" shall mean a "parent corporation," whether now or 
hereafter existing, as defined in Section 424(e) of the Internal Revenue Code 
of 1986, as amended.

          (n)  "PLAN" shall mean this 1987 Stock Option Plan.

          (o)  "RULE 16b-3" shall mean Rule 16b-3 of the Securities Exchange 
Act of 1934, as amended, or any successor to Rule 16b-3, as in effect when 
discretion is being exercised with respect to the Plan.

          (p)  "SHARE" shall mean a share of Common Stock, as adjusted in 
accordance with Section 11 of the Plan.

          (q)  "SUBSIDIARY" shall mean a "subsidiary corporation," whether 
now or hereafter existing, as defined in Section 424(f) of the Internal 
Revenue Code of 1986, as amended.

     3.   STOCK SUBJECT TO THE PLAN.  Subject to the provisions of Section 11 
of the Plan, the maximum aggregate number of shares which may be optioned and 
sold under the Plan is 13,069,009 shares of Common Stock*.  The Shares may be 
authorized, but unissued, or reacquired Common Stock.

_______________

* Does not include 568,791 shares issued upon exercise of options granted 
under the predecessor plan.


                                      2.
<PAGE>

          If an Option should expire or become unexercisable for any reason 
without having been exercised in full, the unpurchased Shares which were 
subject thereto shall, unless the Plan shall have been terminated, become 
available for future grant under the Plan.

     4.   ADMINISTRATION OF THE PLAN.

          (a)  PROCEDURE.  The Plan shall be administered by the Board of 
Directors of the Company.

               The Board of Directors may appoint a Committee consisting of 
not less than two members of the Board of Directors to administer the Plan on 
behalf of the Board of Directors, subject to such terms and conditions as the 
Board of Directors may prescribe.  One or more of these members may be 
"Non-Employee Directors" (a director who is receiving no compensation from 
the Company other than for service on the Board of Directors or who does not 
receive such additional compensation which exceeds the limits specified in 
the definition of such term under Rule 16b-3). Once appointed, the Committee 
shall continue to serve until otherwise directed by the Board of Directors.  
From time to time the Board of Directors may increase the size of the 
Committee and appoint additional members thereof, remove members (with or 
without cause), and appoint new members in substitution therefor, fill 
vacancies however caused and remove all members of the Committee, and 
thereafter directly administer the Plan.  Notwithstanding anything in this 
Section 4 to the contrary, at any time the Board or the Committee may 
delegate to a committee of one or more members of the Board of Directors the 
authority to grant Options to all Employees and Consultants or any portion or 
class thereof.

               Members of the Board who are either eligible for Options or 
have been granted Options may vote on any matters affecting the 
administration of the Plan or grant of any Options pursuant to the Plan, 
except that no such member shall act upon the granting of an Option to 
himself, but any such member may be counted in determining the existence of a 
quorum at any meeting of the Board during which action is taken with respect 
to the granting of Options to him.

          (b)  POWERS OF THE BOARD.  Subject to the provisions of the Plan, 
the Board shall have the authority, in its discretion: (i) to grant Incentive 
Stock Options, in accordance with Section 422 of the Internal Revenue Code of 
1986, as amended, or "non-statutory stock options"; (ii) to determine, upon 
review of relevant information and in accordance with Section 8(b) of the 
Plan, the fair market value of the Common Stock; (iii) to determine the 
exercise price per share of Options to be granted, which exercise price shall 
be determined in accordance with Section 8(a) of the Plan; (iv) to determine 
the Employees or Consultants to whom, and the time or times at which, Options 
shall be granted and the number of shares to be represented by each Option; 
(v) to interpret the Plan; (vi) to prescribe, amend and rescind rules and 
regulations relating to the Plan; (vii) to determine the terms and provisions 
of each Option granted (which need not be identical) in accordance with the 
Plan, and, with the consent of the holder thereof with respect to any adverse 
change, modify or amend each Option; (viii) to accelerate or defer (the 
latter with the consent of the Optionee) the exercise date of any Option; 
(ix) to authorize any person to execute on behalf of the Company any 
instrument required to effectuate the grant


                                      3.
<PAGE>

of an Option previously granted by the Board; and (x) to make all other 
determinations deemed necessary or advisable for the administration of the 
Plan.

          (c)  EFFECT OF BOARD'S DECISION.  All decisions, determinations and 
interpretations of the Board shall be final and binding on all Optionees and 
any other holders of any Options granted under the Plan.

     5.   ELIGIBILITY.  Options may be granted only to Employees or 
Consultants as defined in Section 2 hereof.  An Employee or Consultant who 
has been granted an Option may, if he is otherwise eligible, be granted an 
additional Option or Options.

          Incentive Stock Options may only be granted to Employees.  The 
aggregate fair market value (determined at the time the Option is granted) of 
the stock with respect to which Incentive Stock Options are exercisable for 
the first time by such individual during any calendar year (under this Plan 
or under any other incentive stock option plan of the Company or any Parent 
or Subsidiary of the Company) shall not exceed $100,000.  To the extent that 
the grant of an Option exceeds this limit, the portion of the Option which 
exceeds such limit shall be treated as a non-statutory stock option.

          The Plan shall not confer upon any Optionee any right with respect 
to continuation of employment or consultancy by the Company, nor shall it 
interfere in any way with his right or the Company's right to terminate his 
employment at any time or his consultancy pursuant to the terms of the 
Consultant's agreement with the Company.

     6.   TERM OF THE PLAN. The Plan shall become effective upon the earlier 
to occur of its adoption by the Board of Directors or its approval by vote of 
the holders of a majority of the outstanding shares of the Company entitled 
to vote on the adoption of the Plan.  It shall continue in effect for a term 
of ten (10) years unless sooner terminated under Section 13 of the Plan.

     7.   TERM OF OPTION.  The term of each Option shall be ten (10) years 
from the date of grant thereof or such shorter term as may be provided in the 
Stock Option Agreement.  However, in the case of an Incentive Stock Option 
granted to an Employee who immediately before the Incentive Stock Option is 
granted, owns stock representing more than ten percent (10%) of the voting 
power of all classes of stock of the Company or any Parent or Subsidiary, the 
term of the Incentive Stock Option shall be five (5) years from the date of 
grant thereof or such shorter time as may be provided in the Stock Option 
Agreement.

     8.   EXERCISE PRICE AND CONSIDERATION.

          (a)  The per Share exercise price for the Shares to be issued 
pursuant to exercise of an Option shall be such price as is determined by the 
Board, but shall be subject to the following:

               (i)  In the case of an Incentive Stock Option:


                                      4.
<PAGE>

                    (A)  Granted to an Employee who, immediately before the 
grant of such Incentive Stock Option, owns stock representing more than ten 
percent (10%) of the voting power of all classes of stock of the Company or 
any Parent or Subsidiary, the per Share exercise price shall be no less than 
110% of the fair market value per Share on the date of grant.

                    (B)  Granted to any Employee, the per Share exercise 
price shall be no less than 100% of the fair market value per Share on the 
date of grant.

               (ii) In the case of an Option granted on or after the 
effective date of registration of any class of equity security of the Company 
pursuant to Section 12 of the Exchange Act and prior to six months after the 
termination of such registration, the per Share exercise price shall be not 
less than 100% of the fair market value per Share on the date of grant.

               (iii)     Notwithstanding the foregoing, an Option (whether an 
Incentive Stock Option or non-statutory stock option) may be granted with an 
exercise price lower than set forth in the preceding paragraphs if such 
Option is granted pursuant to an assumption or substitution for another 
option in a manner satisfying the provisions of Section 424(a) of the Code.

          (b)  The fair market value shall be determined by the Board in its 
discretion: PROVIDED HOWEVER, that where there is a public market for the 
Common Stock, the fair market value per Share shall be the average of the 
high and low prices of the Common Stock on the date of grant, as reported on 
the New York Stock Exchange.

          (c)  The consideration to be paid for the Shares to be issued upon 
exercise of an Option, including the method of payment, shall be determined 
by the Board and may consist entirely of cash, check, promissory note, other 
Shares of Common Stock having a fair market value on the date of surrender 
equal to the aggregate exercise price of the Shares as to which said option 
shall be exercised, or any combination of such methods of payment, or such 
other consideration and method of payment for the issuance of Shares to the 
extent permitted under applicable law.  In making its determination as to the 
type of consideration to accept, the Board shall consider if acceptance of 
such consideration may be reasonably expected to benefit the Company.

     9.   EXERCISE OF OPTION.

          (a)  PROCEDURE FOR EXERCISE RIGHTS AS A SHAREHOLDER.  Any Option 
granted hereunder shall be exercisable at such times and under such 
conditions as determined by the board, including performance criteria with 
respect to the Company and/or the Optionee, and as shall be permissible under 
the terms of the Plan. 

               An Option may not be exercised for a fraction of a Share.


                                      5.
<PAGE>

               An Option shall be deemed to be exercised when written notice 
of such exercise has been given to the Company in accordance with the terms 
of the Option by the person entitled to exercise the Option and full payment 
for the Shares with respect to which the Option is exercised has been 
received by the Company.  Full payment may, as authorized by the Board, 
consist of any consideration and method of payment allowable under Section 
8(c) of the Plan.  Until the issuance (as evidenced by the appropriate entry 
on the books of the Company or of a duly authorized transfer agent of the 
Company) of the stock certificate evidencing such Shares, no right to vote or 
receive dividends or any other rights as a shareholder shall exist with 
respect to the Optioned Stock, notwithstanding the exercise of the Option.  
No adjustment will be made for a dividend or other right for which the record 
date is prior to the date the stock certificate is issued, except as provided 
in Section 11 of the Plan.

               Exercise of an Option in any manner shall result in a decrease 
in the number of Shares which thereafter may be available, both for purposes 
of the Plan and for sale under the Option, by the number of Shares as to 
which the Option is exercised. 

          (b)  TERMINATION OF STATUS AS AN EMPLOYEE OR CONSULTANT.  If an 
employee ceases to serve as an Employee or Consultant, he may, but only 
within thirty (30) days (or such other period of time not exceeding three (3) 
months as is determined by the Board) after the date he ceases to be an 
Employee or Consultant of the Company, exercise his Option to the extent that 
he was entitled to exercise it at the date of such termination.  To the 
extent that he was not entitled to exercise the Option at the date of such 
termination, or if he does not exercise such Option (which he was entitled to 
exercise) within the time specified herein, the Option shall terminate.

          (c)  DEATH OF OPTIONEE.  In the event of the death of an Optionee:

               (i)  during the term of the Option who is at the time of his 
death an Employee or Consultant of the Company and who shall have been in 
Continuous Status as an Employee or Consultant since the date of grant of the 
Option, the Option may be exercised at any time within three (3) months 
following the date of death, by the Optionee's estate or by a person who 
acquired the right to exercise the Option by bequest or inheritance, but only 
to the extent of the right to exercise that would have accrued had the 
Optionee continued living three (3) months after the date of death; or

               (ii) within one (1) month after the termination of Continuous 
Status as an Employee or Consultant, the Option may be exercised, at any time 
within three (3) months following the date of death, by the Optionee's estate 
or by a person who acquired the right to exercise the Option by bequest or 
inheritance, but only to the extent of the right to exercise that had accrued 
at the date of termination.

     10.  NON-TRANSFERABILITY OF OPTIONS.  Except as otherwise expressly 
provided in the terms of an individual Option which is a non-statutory stock 
option, the Option may not be sold, pledged, assigned, hypothecated, 
transferred, or disposed of in any manner other than by will or by the laws 
of descent or distribution and may be exercised, during the lifetime of the 


                                      6.
<PAGE>

Optionee, only by the Optionee.  Notwithstanding the foregoing, the person to 
whom the Option is granted may, by delivering written notice to the Company, 
in a form satisfactory to the Company, designate a third party who, in the 
event of the death of the Optionee, shall thereafter be entitled to exercise 
the Option.

     11.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION OR MERGER.  Subject to 
any required action by the shareholders of the Company, the number of shares 
of Common Stock covered by each outstanding Option, and the number of shares 
of Common Stock which have been authorized for issuance under the Plan but as 
to which no Options have yet been granted or which have been returned to the 
Plan upon cancellation or expiration of an Option, as well as the price per 
share of Common Stock covered by each such outstanding Option, shall be 
proportionately adjusted for any increase or decrease in the number of issued 
shares of Common Stock resulting from a stock split or the payment of a stock 
dividend with respect to the Common Stock or any other increase or decrease 
in the number of issued shares of Common Stock effected without receipt of 
consideration by the Company; PROVIDED, HOWEVER, that conversion of any 
convertible securities of the Company shall not be deemed to have been 
"effected without receipt of consideration."  Such adjustments shall be made 
by the Board, whose determination in that respect shall be final, binding and 
conclusive.  Except as expressly provided herein, no issuance by the Company 
of shares of stock of any class, or securities convertible into shares of 
stock of any class, shall affect, and no adjustment by reason thereof shall 
be made with respect to, the number or price of shares of Common Stock 
subject to an Option.

          In the event of the proposed dissolution or liquidation of the 
Company, or in the event of a proposed sale of all or substantially all of 
the assets of the Company, or the merger of the Company with or into another 
corporation, the Option will terminate immediately prior to the consummation 
of such proposed action, unless otherwise provided by the Board.  The Board 
may, in the exercise of its sole discretion in such instances, declare that 
any Option shall terminate as of a date fixed by the Board and give each 
Optionee the right to exercise his Option as to all or any part of the 
Optioned Stock, including Shares as to which the Option would not otherwise 
be exercisable. If the Board, at its sole discretion, permits acceleration as 
to all or any part of the Optioned Stock, the aggregate fair market value 
(determined at the time an Option is granted) of stock with respect to which 
Incentive Stock Options first become exercisable in the year of such 
dissolution, liquidation, sale of assets or merger cannot exceed $100,000.  
Any remaining accelerated Incentive Stock Options shall be treated as 
non-statutory stock options.

     12.  TIME OF GRANTING OPTIONS.  The date of grant of an Option shall, 
for all purposes, be the date on which the Board makes the determination 
granting such Option.  Notice of the determination shall be given to each 
Employee or Consultant to whom an Option is so granted within a reasonable 
time after the date of such grant. 


                                      7.
<PAGE>

      13.  AMENDMENT AND TERMINATION OF THE PLAN.

          (a)  AMENDMENT AND TERMINATION.  The Board may amend or terminate 
the Plan from time to time in such respects as the Board may deem advisable; 
provided that, the following revisions or amendments shall require approval 
of the holders of a majority of the outstanding shares of the Company 
entitled to vote:

               (i)  any increase in the number of Shares subject to the Plan, 
other than in connection with an adjustment under Section 11 of the Plan; or

               (ii) any change in the designation of the class of employees 
or other persons eligible to be granted Options; or

               (iii)     if the Company has a class of equity security 
registered under Section 12 of the Exchange Act at the time of such revision 
or amendment, any change which requires stockholder approval in order to 
comply with Rule 16b-3.

          (b)  EFFECT OF AMENDMENT OR TERMINATION.  Any such amendment or 
termination of the Plan shall not adversely affect Options already granted 
and such Options shall remain in full force and effect as if this Plan had 
not been amended or terminated, unless mutually agreed otherwise between the 
Optionee and the Board, which agreement must be in writing and signed by the 
Optionee and the Company.

     14.  CONDITIONS UPON ISSUANCE OF SHARES.  Shares shall not be issued 
pursuant to the exercise of an Option unless the exercise of such Option and 
the issuance and delivery of such Shares pursuant thereto shall comply with 
all relevant provisions of the law, including without limitation, the 
Securities Act of 1933, as amended; the Securities Exchange Act of 1934, as 
amended; the rules and regulations promulgated thereunder, and the 
requirements of any stock exchange upon which the Shares may then be listed, 
and shall be further subject to the approval of counsel for the Company with 
respect to such compliance.

          As a condition to the exercise of an Option, the Company may 
require the person exercising such Option to represent and warrant at time of 
any such exercise that the Shares are being purchased only for investment and 
without any present intention to sell or distribute such Shares if, in the 
opinion of counsel for the Company.  such a representation is required by any 
of the aforementioned relevant provisions of law.

     15.  RESERVATION OF SHARES.  The Company, during the term of this Plan, 
will at all times reserve and keep available such number of Shares as shall 
be sufficient to satisfy the requirements of the Plan.

          Inability of the Company to obtain authority from any regulatory 
body having jurisdiction, which authority is deemed by the Company's counsel 
to be necessary to the lawful issuance and sale of any Shares hereunder, 
shall relieve the Company of any liability in respect


                                      8.
<PAGE>

of the failure to issue or sell such Shares as to which such requisite 
authority shall not have been obtained.

     16.  OPTION AGREEMENT.  Options shall be evidenced by written option 
agreements in such form as the Board shall approve.

     17.  EFFECTIVE DATE.  The Plan, as amended and restated herein, shall 
become effective on August 15, 1996.


                                      9.


<PAGE>
                                                                     EXHIBIT 5.1
 
                        [COOLEY GODWARD LLP LETTERHEAD]
 
January 28, 1997
 
Cadence Design Systems, Inc.
2655 Seely Road
Building 5, M55B2
San Jose, CA 95134
 
RE:  CADENCE DESIGN SYSTEMS, INC.
 
Ladies and Gentlemen:
 
You have requested our opinion with respect to certain matters in connection
with the filing by Cadence Design Systems, Inc. (the "Company") of a
Registration Statement on Form S-3 (the "Registration Statement") with the
Securities and Exchange Commission covering the Offering of 700,000 shares of
the Company's Common Stock (the "Shares"), with a par value of $0.01, upon
exercise of options ("Options") granted pursuant to an option agreements dated
July 20, 1988 and April 26, 1993 each, as amended on January 22, 1997, between
Joseph B. Costello and the Company, in accordance with the Company's 1987 Stock
Option Plan.
 
In connection with this opinion, we have examined the Registration Statement,
the Company's Certificate of Incorporation and Bylaws, as amended, and such
other documents, records, certificates, memoranda and other instruments we deem
necessary as a basis for this opinion. We have assumed the genuineness and
authenticity of all documents submitted to us as originals, the conformity of
originals of all documents submitted to us as copies thereof, and the due
execution and delivery of all documents where due execution and delivery are a
prerequisite to the effectiveness thereof.
 
On the basis of the foregoing, and in reliance thereon, we are of the opinion
that the Shares, issuable upon exercise of the Options, when issued in
accordance with the terms of such Options, will be duly authorized, validly
issued, fully paid and nonassessble.
 
We consent to the filing of this opinion as an exhibit to the Registration
Statement and to the reference to our firm under the caption "Legal Matters" in
the Prospectus included in the Registration Statement.
 
Very truly yours,
 
COOLEY GODWARD LLP
 
/S/ JULIA L. DAVIDSON
 
Julia L. Davidson

<PAGE>
                                  EXHIBIT 23.1
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
    As independent public accountants, we hereby consent to the use of our
report and to all references to our Firm included in or made a part of this
Registration Statement.
 
                                          Arthur Andersen LLP
 
San Jose, California
January 27, 1997


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