AVANT CORP
S-3/A, 1999-03-09
PREPACKAGED SOFTWARE
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<PAGE>
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MARCH 9, 1999
    
 
                                                      REGISTRATION NO. 333-67629
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                           --------------------------
 
   
                               AMENDMENT NO. 3 TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
    
                           --------------------------
 
                               AVANT! CORPORATION
             (Exact Name of Registrant as Specified in Its Charter)
 
<TABLE>
<S>                               <C>
            DELAWARE                            94-3133226
  (State or Other Jurisdiction       (I.R.S. Employer Identification
      of Incorporation or                        Number)
         Organization)
</TABLE>
 
                             46871 BAYSIDE PARKWAY
                           FREMONT, CALIFORNIA 94538
                                 (510) 413-8000
    (Address, Including Zip Code, and Telephone Number, Including Area Code,
                  of Registrant's Principal Executive Offices)
 
                                 GERALD C. HSU
          CHAIRMAN OF THE BOARD, PRESIDENT AND CHIEF EXECUTIVE OFFICER
                               AVANT! CORPORATION
                             46871 BAYSIDE PARKWAY
                           FREMONT, CALIFORNIA 94538
                                 (510) 413-8000
           (Name, Address, Including Zip Code, and Telephone Number,
                   Including Area Code, of Agent for Service)
 
      THE COMMISSION IS REQUESTED TO SEND COPIES OF ALL COMMUNICATIONS TO:
                         ROBERT V. GUNDERSON, JR., ESQ.
                            STEVEN M. SPURLOCK, ESQ.
                           ANTHONY J. MCCUSKER, ESQ.
                            GUNDERSON DETTMER STOUGH
                      VILLENEUVE FRANKLIN & HACHIGIAN, LLP
                             155 CONSTITUTION DRIVE
                          MENLO PARK, CALIFORNIA 94025
                                 (650) 321-2400
                           --------------------------
 
    Approximate date of commencement of proposed sale to the public: As soon as
practicable after this 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.  / /
 
    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>
   
                   SUBJECT TO COMPLETION, DATED MARCH 9, 1999
    
 
   
                                1,256,005 SHARES
                               AVANT! CORPORATION
                                  COMMON STOCK
    
 
                               ------------------
 
   
    INVESTING IN OUR COMMON STOCK INVOLVES CERTAIN RISKS. SEE "RISK FACTORS"
STARTING ON PAGE 4.
    
 
                            ------------------------
 
   
    The selling stockholders listed on pages 13-17 are offering and selling
1,256,005 shares of our common stock under this prospectus.
    
 
    The selling stockholders may offer their Avant! stock through public or
private transactions, on or off The Nasdaq National Market, at prevailing market
prices, or at privately negotiated prices.
 
   
    Our common stock is traded on The Nasdaq National Market under the symbol
"AVNT." On March 5, 1999, the closing bid price of the common stock on The
Nasdaq National Market was $16.375 per share.
    
 
                            ------------------------
 
   
    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS
PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
    
 
                            ------------------------
 
   
                 The date of this prospectus is March   , 1999
    
<PAGE>
                               TABLE OF CONTENTS
 
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                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
Business of Avant!.........................................................................................           3
 
Risk Factors...............................................................................................           4
 
Forward Looking Statements.................................................................................          13
 
Use of Proceeds............................................................................................          13
 
Selling Stockholders.......................................................................................          14
 
Plan of Distribution.......................................................................................          18
 
Description of Capital Stock...............................................................................          18
 
Legal Matters..............................................................................................          20
 
Experts....................................................................................................          20
 
Where You Can Find More Information........................................................................          21
</TABLE>
 
                                       2
<PAGE>
                             THE BUSINESS OF AVANT!
 
    At Avant!, we develop, market and support computer software for integrated
circuit design automation--also known as electronic design automation. This
software is used for the design of integrated circuits, particularly integrated
circuits that are extremely small, or with "submicron"-sized (smaller than 1
micron) and "deep submicron"-sized features (smaller than 0.5 micron). Our
products are used in the design of a variety of integrated circuits, including
microprocessors, memory chips and application-specific integrated circuits.
Compared to previous generations of integrated circuit design automation
software, our products offer improved time to market, reduced development and
manufacturing costs and enhanced integrated circuit performance. End users of
our products include a number of leading electronics companies, such as
Matsushita, Motorola, National Semiconductor, Fujitsu, Toshiba, Mitsubishi,
Hitachi, Samsung and Sony.
 
    Our principal executive offices are located at 46871 Bayside Parkway,
Fremont, California 94538, and our telephone number is (510) 413-8000.
 
                            ------------------------
 
     This prospectus includes trademarks of Avant! and other corporations.
 
                            ------------------------
 
                                       3
<PAGE>
                                  RISK FACTORS
 
   
WE ARE INVOLVED IN SEVERAL LITIGATION MATTERS THAT COULD SERIOUSLY HARM MANY
  ASPECTS OF OUR BUSINESS, INCLUDING OUR OPERATING RESULTS, FINANCIAL CONDITION
  AND REPUTATION
    
 
   
    We and our subsidiaries are engaged in various litigation matters which,
regardless of their outcomes, may result in substantial costs and expenses and
significant diversion of effort by our management. These various matters could
seriously harm our business, financial condition and results of operations and
could possibly result in a steep decline in the trading price of our common
stock.
    
 
    - CADENCE LITIGATION.
 
   
    In December 1995 Cadence filed an action against Avant! and certain of its
officers in federal court alleging copyright infringement, unfair competition,
misappropriation of trade secrets, conspiracy, breach of contract, inducing
breach of contract and false advertising. The essence of the complaint is that
certain of our employees who were formerly Cadence employees allegedly
misappropriated and improperly copied source code for certain important
functions of our place and route products from Cadence, and that we have
allegedly competed unfairly by making false statements concerning Cadence and
its products. The action also alleges that we induced certain individual
defendants to breach their agreements of employment and confidentiality with
Cadence. Trial has been scheduled for October 12, 1999.
    
 
   
    In addition to actual and punitive damages, which have not been quantified
by Cadence, Cadence is seeking to enjoin the sale of our place and route
products pending trial of the action. In December 1997 the court entered an
injunction against, among other things, continued sales or licensing of any
product or work copied or derived from Cadence's Design Framework II,
specifically including, but not limited to, our ArcCell products. In December
1998 the court entered an injunction against us, prohibiting us from directly or
indirectly marketing, selling, leasing, licensing, copywriting or transferring
our Aquarius, Aquarius XO and Aquarius BV products.
    
 
   
    Avant! believes it has defenses to all of Cadence's claims and intends to
defend itself vigorously. If, however, our defenses are unsuccessful, we may
ultimately be permanently enjoined from selling certain place and route products
and may be required to pay monetary damages to Cadence. In addition, upon
further consideration by the court, we could be preliminarily enjoined from
selling our Apollo place and route products. Furthermore, it is possible that
our relationships with our customers and/or partners will be seriously harmed as
a result of the Cadence litigation.
    
 
    - CRIMINAL INDICTMENT.
 
   
    In December 1998 after a grand jury investigation, the Santa Clara County
District Attorney's office filed a criminal indictment alleging felony level
offenses related to the allegations of misappropriation of trade secrets set
forth in Cadence's lawsuit against, among others, Avant! and the following
current or former employees and/or directors of Avant!:
    
 
   
    - Gerald C. Hsu, President, Chief Executive Officer and Chairman of our
      board of directors;
    
 
   
    - Y. Eric Cho, a former officer and former member of our board of directors;
    
 
    - Y. Z. Liao, Corporate Fellow;
 
    - Stephen Wuu, CEO Staff Operations;
 
    - Leigh Huang, former marketing manager;
 
    - Eric Cheng, Research and Development Manager; and
 
   
    - Mike Tsai, a former officer and former member of our board of directors.
    
 
                                       4
<PAGE>
   
    The indictment charges these defendants with conspiring to commit trade
secret theft, trade secret theft, inducing the theft of a trade secret,
conspiracy to commit fraudulent practices in connection with the offer or sale
of a security and fraudulent practices in connection with the offer or sale of a
security. The criminal indictment could result in additional defense costs and
criminal fines against us, as well as the potential incarceration of certain
members of our management team and board of directors. Such outcomes could
result in canceled or postponed orders, increased future expenditures, the loss
of management and other key personnel, additional stockholder litigation and
loss of goodwill.
    
 
    - SILVACO LITIGATION.
 
   
    In March 1993, Meta Software Inc., which we acquired in October 1996 and
which is now our wholly owned subsidiary, filed a complaint in state court
against Silvaco Data Systems, Inc. seeking monetary damages and injunctive
relief. In August 1995, Silvaco filed a cross-complaint against Meta and Shawn
Hailey, then the President and Chief Executive Officer of Meta, alleging, among
other things, that Meta owed Silvaco royalties and license fees under a product
development and marketing program and unpaid commissions related to Silvaco's
sale of Meta's products and services under such program. In November 1997, a
judgment of $31.4 million was entered against us. We filed appeals on our own
behalf and on behalf of Mr. Hailey.
    
 
   
    In March 1998 Silvaco filed an additional lawsuit against Avant! and Roy
Jewell, Avant!'s CEO Staff, Corporate Development. The lawsuit alleges causes of
action for defamation, negligent and intentional interference with economic
advantage, unfair competition, Lanham Act violations and consumer fraud. Silvaco
is seeking $20 million in compensatory damages, punitive damages and an
injunction.
    
 
    - PESIC LITIGATION.
 
   
    In September 1996, Katherine Ngai Pesic and Ivan Pesic commenced an action
naming as defendants Avant! (as successor in interest to Meta), Shawn Hailey,
Meta's former President and Chief Executive Officer, and Thomas N. White, Jr.
and George S. Cole, both of whom were Meta's former counsel in the Silvaco
litigation. The action asserts claims for invasion of privacy under California
common law and the California Constitution and seeks compensatory and punitive
damages.
    
 
    - SECURITIES CLASS ACTION CLAIMS.
 
   
    In December 1995 Paul Margetis and Helen Margetis filed in federal court a
securities fraud class action complaint against Avant!. This lawsuit alleges
certain securities law violations, including omissions and/or misrepresentation
of material facts that are largely consistent with those outlined in the Cadence
claim. In addition, in May 1997 Joanne Hoffman filed a class action lawsuit
alleging securities claims on behalf of purchasers of Avant!'s stock between
March 29, 1996 and April 11, 1997, the date of the filing of a criminal
complaint against Avant! and six of its employees and/or officers. Ms. Hoffman
alleges that Avant! and its officers misled the market as to the likelihood of
criminal charges being filed and as to the validity of the Cadence allegations.
    
 
    - NEQUIST LITIGATION.
 
   
    In July 1998 Eric Nequist filed in state court a complaint against Avant!.
The complaint alleges causes of action for defamation, intentional infliction of
emotional distress, negligent and intentional interference with economic
advantage, abuse of process and violations of California Business and Profession
Code section 17200. No trial date has been set, and the parties have been
ordered to mediation, which has been scheduled for April 15, 1999. Avant! has
moved for a stay of this lawsuit pending resolution of the criminal action.
    
 
   
    With regard to the Silvaco, Pesic, securities class action and Nequist
litigations, Avant! believes its has defenses to the claims brought and intends
to defend itself vigorously. However, if its defenses or appeals are
unsuccessful, Avant! will be required to pay substantial monetary damages to the
respective plaintiffs.
    
 
                                       5
<PAGE>
   
ASPECTS OF OUR BUSINESS, INCLUDING OUR OPERATING RESULTS, MAY SUFFER IF WE FAIL
  TO SUCCESSFULLY INTEGRATE OUR OPERATIONS AND PRODUCT LINES WITH THOSE OF
  INTERHDL AND ACEO
    
 
   
    We have recently acquired interHDL, Inc. and ACEO Technology, Inc. The
integration of those businesses presents difficult challenges for our
management. While our management believes that the combination of Avant!,
interHDL and ACEO could create significant value for our shareholders, it is
possible that our management will not effectively manage these business
combinations to realize the anticipated synergies. Our failure to effectively
integrate our operations with those of our newly acquired companies could
seriously harm our business, financial condition and results of operations.
    
 
   
    Avant! and its newly acquired companies each have different systems and
procedures in various operational areas that must be integrated. We may not
effectively and expeditiously integrate these systems. The difficulties we face
include coordinating geographically separated divisions, integrating personnel
with disparate business backgrounds and combining different corporate cultures.
The integration of certain operations will distract the attention of our
management from our day-to-day business. The business of the combined company
may also be disrupted by employee uncertainty and lack of focus during the
integration process. Accordingly, we may not be able to retain all of our key
technical, sales and other key personnel.
    
 
   
ASPECTS OF OUR BUSINESS, INCLUDING OUR OPERATING RESULTS, MAY SUFFER IF WE FAIL
  TO SUCCESSFULLY MANAGE OUR EXPANDING OPERATIONS
    
 
   
    We have experienced periods of rapid growth and significant expansion of our
operations that have placed a significant strain upon our management systems and
resources. In addition, we have recently hired a significant number of
employees, and we plan to further increase our total headcount. We also plan to
expand the geographic scope of our customer base and operations. This expansion
has resulted and will continue to result in substantial demands on our
management resources. Our ability to manage future expansion of our operations
will require us to continue to improve our financial and management controls,
reporting systems and procedures on a timely basis and expand, train and manage
our employee work force. We may not be successful in addressing these risks, and
our failure to do so would seriously harm our business, financial condition and
results of operations.
    
 
   
WE MAY LOSE KEY PERSONNEL DUE TO THE VARIOUS LITIGATION MATTERS IN WHICH WE ARE
  INVOLVED
    
 
   
    Our future operating results depend in significant part upon the continued
service of key management and technical personnel. Several of our key personnel
have been criminally indicted on charges relating to the matters underlying the
pending litigation between Avant! and Cadence. If any of the individuals
criminally indicted are found guilty and incarcerated or are otherwise unable to
continue to provide services to us, our business, financial condition and
results of operations could be seriously harmed. In addition, few of our
employees are bound by employment or non-competition agreements, and due to the
intense competition for such personnel, as well as the uncertainty caused by the
pending litigation, it is possible that we will fail to retain key technical and
managerial personnel.
    
 
   
COMPETITION IN OUR INDUSTRY FOR HIGHLY SKILLED INDIVIDUALS, AND THE EXISTENCE OF
  THE PENDING LITIGATION MATTERS, MAY HARM OUR ABILITY TO ATTRACT AND RETAIN
  NECESSARY MANAGEMENT AND TECHNICAL PERSONNEL
    
 
   
    There are only a limited number of qualified integrated circuit design
automation engineers, and competition for these individuals is intense.
Moreover, these individuals may be reluctant to join and remain with our company
due to the risks posed by the pending litigation matters. If we are unable to
attract, hire and retain qualified personnel in the future, the development of
new products and the management of our increasingly complex business would be
impaired. This would seriously harm our business, operating results and
financial condition.
    
 
                                       6
<PAGE>
WE MAY BE UNABLE TO SUCCESSFULLY COMPETE IN THE HIGHLY COMPETITIVE INTEGRATED
  CIRCUIT DESIGN AUTOMATION SOFTWARE MARKET
 
   
    The integrated circuit design automation software market in which we compete
is intensely competitive. We currently face competition from major integrated
circuit design automation vendors, including Cadence, which currently holds a
dominant share of the market for integrated circuit physical design software,
Synopsys, Inc. and Mentor Graphics Corporation. We may fail to compete
successfully against these competitors, harming our business, operating results
and financial condition. This is particularly true because each of these
companies has a longer operating history, significantly greater financial,
technical and marketing resources, greater name recognition and a larger
installed customer base than Avant!. In addition, each of these competitors will
likely be able to respond more quickly to new or emerging technologies and
changes in customer requirements, and to devote greater resources to the
development, promotion and sale of their products than Avant!. These competitors
also have established relationships with our current and potential customers,
and they can devote substantial resources aimed at preventing us from enhancing
relationships with existing customers or establishing relationships with
potential customers. Competitors may develop products comparable or superior to
ours or adapt more quickly than us to new technologies, evolving industry trends
or changing customer requirements.
    
 
   
COMPETITIVE PRESSURES IN OUR INDUSTRY MAY INCREASE, MAKING IT MORE DIFFICULT FOR
  US TO COMPETE SUCCESSFULLY
    
 
   
    We expect competitive pressures in our industry to increase for a number of
reasons. Because barriers to entry in our industry are relatively low, we expect
additional competition from other established and emerging companies. In
addition, the integrated circuit design automation software industry is
experiencing a trend toward consolidation that is expected to result in large,
more financially flexible competitors having broad ranges of product offerings.
In addition, groups within our existing and potential customers may choose to
design and develop their own customized tools rather than purchasing our
products. These and other factors could result in price reductions, reduced
margins or loss of market share, seriously harming our business, operating
results or financial condition.
    
 
   
THE VALUE OF OUR COMMON STOCK AND ITS FUTURE TRADING PRICE ARE DIFFICULT TO
  PREDICT BECAUSE OUR QUARTERLY OPERATING RESULTS ARE DIFFICULT TO PREDICT
    
 
   
    We are unable to accurately forecast our quarterly revenues and operating
results because of (a) the emerging nature of the market in which we compete,
(b) the unpredictability of the various litigation matters to which we are a
party and (c) the following factors:
    
 
    - Increased competition;
 
    - The length of our sales cycle;
 
   
    - The timing of introductions of new or enhanced products by us or our
      competitors;
    
 
    - Market acceptance of new and enhanced versions of our products;
 
    - Changes in pricing policies by us or our competitors;
 
    - Conditions in the semiconductor and electronics industries;
 
   
    - Cancellation of maintenance agreements;
    
 
    - The unavailability of technology of third parties;
 
   
    - The mix of direct and indirect sales;
    
 
   
    - Economic conditions in the Asian and other markets and our ability to
      continue to market our products in these markets; and
    
 
                                       7
<PAGE>
   
    - Foreign currency exchange rates.
    
 
   
    Also complicating any prediction of our future quarterly revenues and
operating results are the size, timing and structure of significant licenses in
light of our relatively fixed expense levels. Revenues under these licenses are
difficult to forecast. In particular, we have adopted a flexible pricing
strategy under which we offer both perpetual and time-based software licenses to
customers. Because each time-based license may have a different structure or be
subject to cancellation, future revenue received under these licenses is
unpredictable. Meanwhile, our current and future expense levels are based
largely on our operating plans and estimates of future revenues and are, to a
large extent, fixed. If we experience an unexpected revenue shortfall, we may be
unable to adjust our spending quickly enough to compensate. Accordingly, any
significant shortfall in revenues in relation to our planned expenditures would
seriously harm our business, financial condition and results of operations.
    
 
   
    The future value of our common stock is made more difficult to predict by
the fact that public market analysts and other investors could react negatively
to unexpected shortfalls in our revenues or operating results. Additionally, we
may not learn of such revenue shortfalls, earnings shortfalls or other failures
to meet market expectations until late in a fiscal quarter, resulting in an even
more immediate and serious harm to the trading price of our common stock.
    
 
   
BECAUSE OUR STOCK PRICE IS EXTREMELY VOLATILE, YOU COULD LOSE A SUBSTANTIAL
  PORTION OF YOUR INVESTMENT
    
 
    The trading price of our common stock has fluctuated significantly in the
past, and the trading price of our common stock is likely to be highly volatile
and could be subject to wide fluctuations in price in response to such factors
as:
 
    - The outcome of the various litigation matters to which we are a party;
 
    - Actual or anticipated fluctuations in our operating results;
 
    - Announcements of technological innovations and new products by us or our
      competitors;
 
    - New contractual relationships with strategic partners by us or our
      competitors;
 
    - Proposed acquisitions by us or our competitors; and
 
    - Financial results that fail to meet public market analyst expectations of
      performance.
 
   
    In addition, the stock market in general, and The Nasdaq National Market and
the market for technology companies in particular has experienced extreme price
and volume fluctuations that have often been related or disproportionate to the
operating performance of such companies. These broad market and industry factors
may seriously harm the market price of our common stock in future periods, and
you could lose a substantial part of your investment.
    
 
   
OUR INABILITY TO SELL, LICENSE AND SUPPORT EACH PRODUCT WITHIN OUR RELATIVELY
  NARROW PRODUCT OFFERING COULD SIGNIFICANTLY HARM OUR BUSINESS, OPERATING
  RESULTS AND FINANCIAL CONDITION
    
 
   
    Historically, we have derived substantially all of our total revenue from
the licensing and support of a small number of products. We expect to continue
to depend heavily on only a few products. These products are:
    
 
    - Aquarius (our cell-based place and route software product);
 
    - Apollo (our successor product to Aquarius);
 
    - Hercules (our hierarchical physical verification software product);
 
    - Star-Hspice (our circuit simulator);
 
    - Star-Sim (our high-capacity circuit simulation and high-accuracy timing
      analysis software); and
 
                                       8
<PAGE>
    - Polaris (our Verilog simulation product).
 
   
    Absent any adverse results from existing litigation, we currently expect
that each of these products will continue to account for a significant portion
of our revenue for the foreseeable future. As a result, our inability to market
and sell any one of these products could harm our business, operating results
and financial condition.
    
 
WE DEPEND ON INTERNATIONAL SALES FOR A SIGNIFICANT PERCENTAGE OF OUR REVENUE
 
    International revenue, principally from Asian customers, accounted for
approximately 32%, 34%, 44% and 31% of our total revenue in 1995, 1996, 1997 and
1998, respectively. We expect that international license and service revenue,
particularly in Asia, will continue to account for a significant portion of our
total revenue. Our international business activities are subject to a variety of
potential risks, including:
 
    - The impact of recessionary environments in foreign economies;
 
    - Longer receivables collection periods and greater difficulty in accounts
      receivable collection;
 
    - Difficulties in staffing and managing foreign operations;
 
    - Political and economic instability;
 
    - Unexpected changes in regulatory requirements;
 
    - Reduced protection of intellectual property rights in some countries; and
 
    - Tariffs and other trade barriers.
 
   
    Currency exchange fluctuations in countries in which we license our products
could also seriously harm our business, financial condition and results of
operations by resulting in pricing that is not competitive with products priced
in local currencies. Furthermore, we may not be able to continue to price our
products and services internationally in U.S. dollars because of changing
sovereign restrictions on the import and export of foreign currencies as well as
other practical considerations. It is possible that we may fail to sustain or
increase revenue derived from international licensing and service or that the
foregoing factors will seriously harm our future international license and
service revenue, and, consequently, seriously harm our business, financial
condition and results of operations.
    
 
WE DEPEND UPON THIRD PARTY DISTRIBUTORS AND MANUFACTURER'S REPRESENTATIVES TO
  LICENSE AND SUPPORT OUR PRODUCTS IN ASIA
 
   
    We rely on distributors and manufacturer's representatives for the licensing
and support of our products in Asia. A substantial portion of our international
license and service revenue is generated from a limited number of these
representatives (although we had no individual customer representing over 10% of
revenue in any of the years 1994-1998). Our reliance on distributors and
manufacturer's representatives subjects us to a number of risks. For example:
    
 
   
    - our current distributors or manufacturer's representatives may not choose
      to or be able to market, service or support our products effectively;
    
 
   
    - economic conditions or industry demand may seriously harm these
      organizations; or
    
 
   
    - these organizations may devote greater resources to marketing and
      supporting our competitors' products.
    
 
   
    Additionally, because our products are used by highly skilled professional
engineers, a distributor or manufacturer's representative must possess
sufficient technical, marketing and sales resources in order to be effective and
must devote these resources to a lengthy sales cycle, customer training and
product service and support. Only a limited number of distributors or
manufacturer's representatives possess such
    
 
                                       9
<PAGE>
   
resources. Accordingly, the loss of, or a significant reduction in revenue from,
one of our distributors or manufacturer's representatives could seriously harm
our business, financial condition and results of operations.
    
 
   
    You should note that in 1996, we consolidated our Korean sales channel by
forming DavanTech Co., Ltd., a distributor owned by Avant!, Gerald C. Hsu,
Avant!'s Chairman of the Board, President and Chief Executive Officer and other
parties. In 1997, we consolidated our Japanese sales channel by forming
MainGate, a distributor owned by Avant!, Gerald C. Hsu, Avant!'s Chairman of the
Board, President and Chief Executive Officer, and other parties (including other
Avant! employees and former employees of Avant!'s third party distributors).
    
 
OUR FUTURE SUCCESS WILL DEPEND ON OUR ABILITY TO KEEP PACE WITH THE RAPIDLY
  EVOLVING TECHNOLOGY STANDARDS OF OUR INDUSTRY
 
   
    Because the semiconductor industry has recently made significant
technological advances, integrated circuit design automation companies, such as
Avant!, that license software to semiconductor companies have been required to
continuously develop new products and enhancements for existing products to keep
pace with the evolving industry standards and rapidly changing customer
requirements. The evolving nature of the integrated circuit design automation
industry could render our existing products and services obsolete. Our success
will depend, in part, on our ability to:
    
 
    - Enhance our existing products and services;
 
    - Develop and introduce new products and services on a timely and
      cost-effective basis that will keep pace with technological developments
      and evolving industry standards; and
 
    - Address the increasingly sophisticated needs of our customers.
 
    If we are unable, for technical, legal, financial or other reasons, to
respond in a timely manner to changing market conditions or customer
requirements, our business, financial condition and results of operations could
be seriously harmed.
 
   
WE DEPEND ON THE GROWTH OF THE SEMICONDUCTOR AND ELECTRONICS INDUSTRIES
    
 
   
    We are dependent upon the semiconductor industry and, more generally, the
electronics industry. Both of these industries are characterized by rapid
technological change, short product life cycles, fluctuations in manufacturing
capacity and pricing and gross margin pressures. Segments of these industries
have from time to time experienced significant economic downturns characterized
by decreased product demand, production over-capacity, price erosion, work
slowdowns and layoffs. While these industries have experienced an extended
period of significant economic growth over the past few years, such economic
growth may not continue, and if it does not, any downturn could be especially
severe on Avant!. During such downturns, the number of new integrated circuit
design projects often decreases. Because acquisitions of new licenses from
Avant! are largely dependent upon the commencement of new design projects, any
slowdown in these industries could seriously harm our business, financial
condition and results of operations.
    
 
   
PROTECTION OF OUR INTELLECTUAL PROPERTY AND PROPRIETARY RIGHTS MAY BE
  INADEQUATE, EXPOSING US TO LOSSES OF COMPETITIVE ADVANTAGES
    
 
   
    We rely heavily on a combination of patents, trade secrets, copyrights,
trademarks and contractual commitments to protect our proprietary rights in our
software products. We generally enter into confidentiality or license agreements
with our employees, distributors and customers, and limit access to and
distribution of our software, documentation and other proprietary information.
Despite these precautions, a third party may still copy or otherwise obtain and
use our products or technology without authorization, or develop similar
technology independently. In addition, effective patent, copyright and trade
secret
    
 
                                       10
<PAGE>
   
protection may be unavailable or limited in certain foreign countries. If third
parties infringe our intellectual property and proprietary rights with impunity,
we may lose certain competitive advantages. Such losses could materially harm
our future business, operating results and financial condition.
    
 
   
WE MAY EXPERIENCE COSTLY INTELLECTUAL PROPERTY LAWSUITS
    
 
   
    We expect that software companies will increasingly be subject to
infringement claims as the number of products and competitors in the integrated
circuit design automation industry grows and the functionality of products in
different industry segments overlaps. For example, our current litigation with
Cadence involves such infringement claims. Responding to such claims, regardless
of merit, could consume valuable time, result in costly litigation, cause
product shipment delays or require us to enter into royalty or licensing
agreements. Such royalty or licensing agreements, if available, may not be
available on terms acceptable to us. Intellectual property lawsuits could
seriously harm our business, financial condition and results of operations.
    
 
   
ERRORS IN OUR SOFTWARE PRODUCTS COULD RESULT IN LOSS OF MARKET SHARE OR FAILURE
  TO GAIN MARKET ACCEPTANCE
    
 
   
    Software products as complex as ours may contain defects or failures. We
have in the past discovered software defects in certain of our products and may
experience delays or lost revenue to correct such defects in the future. Despite
our testing efforts, errors may still be found in our new products or releases
after we have shipped them. This could result in loss of market share or failure
to gain market acceptance. Any such occurrence could seriously harm our
business, financial condition and results of operations.
    
 
   
EXPENSES AND REVENUE DECLINES RELATED TO THE YEAR 2000 PROBLEM COULD
  SIGNIFICANTLY HARM OUR BUSINESS, OPERATING RESULTS AND FINANCIAL CONDITION
    
 
    STATE OF READINESS
 
    Many currently installed computer systems and software products are coded to
accept only two digit entries in the date code field and cannot distinguish 21st
century dates from 20th century dates. This could result in system failure or
miscalculations causing disruptions of operations, including, among other
things, a temporary inability to process transactions, send invoices or engage
in similar normal business activities. As a result, many companies' software and
computer systems may need to be upgraded or replaced in order to comply with
such "Year 2000" requirements.
 
   
    During 1998, we undertook an evaluation of our currently supported products
to determine if they are Year 2000 compliant. The results of this evaluation
revealed that most currently supported products are Year 2000 compliant. We
intend to upgrade or replace any currently supported products which are not Year
2000 compliant.
    
 
   
    Any failure by us to make our products Year 2000 compliant could result in:
    
 
    - A decrease in sales of our products;
 
   
    - An increase in costs and resource allocations to address our customers'
      problems; and
    
 
   
    - An increase in litigation costs relating to losses suffered by our
      customers due to Year 2000 problems.
    
 
   
    During 1998, we conducted a preliminary review of our internal computer
systems to identify systems that could be affected by the Year 2000 and to
develop a plan to resolve the issue. We have adopted SAP R/3 software as an
enterprise system managing its financial and logistical operations in the United
States. SAP R/3 software has been certified by SAP as Year 2000 compliant. Some
other third party software systems and applications currently used by us,
however, are not Year 2000 compliant. We intend to stop using these software
products or upgrade or replace them as part of our growth plans. We only perform
    
 
                                       11
<PAGE>
   
Year 2000 compliance testing on our critical internal support systems.
Inoperability of internal systems that are certified Year 2000 compliant by the
vendor but not tested by us could seriously harm our operational efficiency. We
are also currently engaged in setting up a plan to make our European accounting
system, currently not on SAP, Year 2000 compliant. Our failure to complete this
work prior to December 31, 1999 could seriously harm our business, financial
condition and results of operations.
    
 
   
    Furthermore, the purchasing patterns of customers or potential customers may
be affected by Year 2000 issues as companies spend significant resources to make
their current systems Year 2000 compliant. These expenditures may result in
reduced funds available to purchase our products and services, which could
seriously harm our business, operating results and financial condition.
    
 
    COSTS
 
   
    We do not have a project tracking system that tracks the cost and time that
our own internal employees spend on our Year 2000 project. Based on our
assessment, the costs incurred to date have had no material impact on our
results of operations. We expect that costs directly related to Year 2000
compliance in excess of normal upgrade and maintenance costs will not exceed
approximately $250,000 for both costs incurred to date and future costs.
    
 
    CONTINGENCY PLANS
 
   
    We do not presently have a contingency plan for handling Year 2000 problems
that are not detected and corrected prior to their occurrences. Upon completion
of testing and implementation activities, we will be able to assess the areas
requiring contingency planning. We expect to develop appropriate planning at
that time. Any failure to address any unforeseen Year 2000 problems could
seriously harm our business, financial condition and results of operations.
    
 
                           FORWARD LOOKING STATEMENTS
 
   
    This prospectus, including the documents incorporated by reference, contains
forward-looking statements. Statements contained in this prospectus or
incorporated by reference that are not purely historical are forward-looking
statements within the meaning of Section 27 of the Securities Act and Section 21
of the Exchange Act, including statements regarding Avant!'s expectations,
beliefs, intentions or strategies regarding the future. Avant! believes that all
forward looking statements included in this document comply with the
requirements of the Securities Act and the Exchange Act. All forward-looking
statements included in this document are based on information available to
Avant! on the date hereof, and Avant! assumes no obligation to update any
forward-looking statements. A forward-looking statement involves a prediction,
the accuracy of which is subject to risks and uncertainties. Avant!'s actual
results could differ materially from those anticipated in these forward-looking
statements as a result of certain factors, including, but not limited to, those
set forth in this prospectus under "Risk Factors." You should carefully consider
the risks described in the "Risk Factors" section, in addition to the other
information set forth in this prospectus and incorporated by reference herein,
before making an investment decision.
    
 
                                USE OF PROCEEDS
 
    All net proceeds from the sale of the Avant! common stock will go to the
stockholders who offer and sell their shares. Accordingly, Avant! will not
receive any proceeds from the sale of the shares by the selling stockholders.
 
                                       12
<PAGE>
                              SELLING STOCKHOLDERS
 
   
    The following table sets forth certain information, as of January 12, 1999,
with respect to the number of shares of common stock owned by the selling
stockholders named below and as adjusted to give effect to the sale of the
shares offered hereby. The shares are being registered to permit public
secondary trading of the shares, and the selling stockholders may offer the
shares for resale from time to time. Based upon 33,246,253 shares of common
stock outstanding on March 5, 1999, Eliezer Sternheim is the only selling
stockholder that owns more than 1% of the outstanding stock of Avant!. See "Plan
of Distribution."
    
 
    The shares being offered by the selling stockholders were acquired from
Avant! in Avant!'s acquisition of interHDL, Inc. pursuant to an agreement and
plan of reorganization dated November 4, 1998, as amended on November 12, 1998.
The shares of common stock were issued pursuant to an exemption from the
registration requirements of the Securities Act. The selling stockholders
represented to Avant! that they were acquiring the shares for investment and
with no present intention of distributing the shares.
 
    Avant! has filed with the SEC, under the Securities Act, a registration
statement on Form S-3, of which this prospectus forms a part, with respect to
the resale of the shares from time to time on The Nasdaq National Market or in
privately-negotiated transactions. Avant! has agreed to use its best efforts to
keep such Registration Statement effective until November 13, 1999 or, if
earlier, the date that all shares have been sold.
 
    The shares offered by this prospectus may be offered from time to time by
the selling stockholders named below:
 
<TABLE>
<CAPTION>
                                                    NUMBER OF                  NUMBER OF
                                                     SHARES                      SHARES
                                                    BENEFICIALLY               BENEFICIALLY
                                                      OWNED      NUMBER OF       OWNED
                                                    PRIOR TO      SHARES       AFTER THE
NAME AND ADDRESS OF SELLING STOCKHOLDERS            OFFERING   BEING OFFERED    OFFERING
- --------------------------------------------------  ---------  -------------   ----------
<S>                                                 <C>        <C>             <C>
IRA ABRAMOV ......................................    1,907          1,907          0
  575 South Rengstorff Avenue #176
  Mountain View, California 94040
 
OFER ACHLER ......................................      572            572          0
  3168 South Court
  Palo Alto, California 94306
 
RENEE ANDERSON ...................................    5,085          5,085          0
  707 Continental Circle #311
  Mountain View, California 94040
 
SANJAY BAJAJ .....................................    8,104          8,104          0
  548 Firloch Avenue #1
  Sunnyvale, California 94086
 
SUDHINDAR BALAKRISHNA ............................    3,016          3,016          0
  175 Calvert Drive #R-202
  Cupertino, California 95014
 
RICHARD ALLAN & SANDRA RAE BOSENKO LIVING TRUST .   145,765        145,765          0
  701 SE Columbia Shores Blvd. #320
  Vancouver, Washington 98661
 
JUSTINE W. CHEN ..................................    1,033          1,033          0
  6618 Mt. Holly Drive
  San Jose, California 95120
</TABLE>
 
                                       13
<PAGE>
<TABLE>
<CAPTION>
                                                    NUMBER OF                  NUMBER OF
                                                     SHARES                      SHARES
                                                    BENEFICIALLY               BENEFICIALLY
                                                      OWNED      NUMBER OF       OWNED
                                                    PRIOR TO      SHARES       AFTER THE
NAME AND ADDRESS OF SELLING STOCKHOLDERS            OFFERING   BEING OFFERED    OFFERING
- --------------------------------------------------  ---------  -------------   ----------
<S>                                                 <C>        <C>             <C>
LILI A. CLAY .....................................      516            516          0
  510 Walker Drive #7
  Mountain View, California 94043
 
PAUL COLWILL .....................................    2,582          2,582          0
  1550 Majorca Drive
  Morgan Hill, California 95037
 
ALAIN DARGELAS ...................................    5,681          5,681          0
  1957 California Street #23
  Mountain View, California 94040
 
DENNIS DECOSTE ...................................   47,675         47,675          0
  220 Wavecrest Avenue
  Santa Cruz, California 95060
 
RODNEY SCOTT DIXON ...............................    9,455          9,455          0
  22465 Linda Ann Court
  Cupertino, California 95014
 
WILLIAM A. DUKE ..................................    9,026          9,026          0
  1711 Santa Lucia Avenue
  San Bruno, California 94066
 
BRUCE EASTMAN ....................................   45,768         45,768          0
  1070 Bryant Avenue
  Mountain View, California 94040
 
ANTHONY H. FRANCOIS ..............................    2,244          2,244          0
  1081 Sargent Drive
  Sunnyvale, California 94087
 
DILIP GANPULE ....................................    6,674          6,674          0
  1655 Alexander Court
  Los Altos, California 94024
 
SAEID GHAFOURI ...................................  146,839        146,839          0
  1304 Tiffany Canyon Court
  San Jose, California 95120
 
CLAUDE B. HAGOPIAN ...............................      834            834          0
  505 Cypress Point Drive #301
  Mountain View, California 94043
 
TYEE HARPSTER ....................................      178            178          0
  680 Manzanita Way
  Woodside, California 94062
 
ANLING HSU .......................................      953            953          0
  1275 Portland Avenue
  Los Altos, California 94024
 
JYH-HUEI HUANG ...................................      381            381          0
  281 West Meadow Drive
  Palo Alto, California 94306
</TABLE>
 
                                       14
<PAGE>
<TABLE>
<CAPTION>
                                                    NUMBER OF                  NUMBER OF
                                                     SHARES                      SHARES
                                                    BENEFICIALLY               BENEFICIALLY
                                                      OWNED      NUMBER OF       OWNED
                                                    PRIOR TO      SHARES       AFTER THE
NAME AND ADDRESS OF SELLING STOCKHOLDERS            OFFERING   BEING OFFERED    OFFERING
- --------------------------------------------------  ---------  -------------   ----------
<S>                                                 <C>        <C>             <C>
LAURIE ISAACSON ..................................   15,256         15,256          0
  P.O. Box 20670
  Castro Valley, California 94546
 
KEVIN JORGENSEN ..................................   23,837         23,837          0
  6587 Winterset Way
  San Jose, California 95120
 
DANIEL J. KOCHER .................................    9,535          9,535          0
  1272 Sharon Park Drive
  Menlo Park, California 94025
 
MEIR LEVINGER ....................................    5,721          5,721          0
  575 South Rengstorff Avenue Apt. #113
  Mountain View, California 94040
 
YAN LIN ..........................................    1,907          1,907          0
  427 Acalanes Drive Apt. 6
  Sunnyvale, California 94086
 
RUBEN MAGANAS ....................................      953            953          0
  550 Piercy Road
  San Jose, California 94306
 
MEIRAV NITZAN ....................................    3,814          3,814          0
  575 South Rengstorff Avenue #148
  Mountain View, California 94040
 
DAN Z. PERI ......................................    7,469          7,469          0
  3418 South Court
  Palo Alto, California 94306
 
ARUN RAMACHANDRAN ................................   41,163         41,163          0
  7525 Heatherwood Drive
  Cupertino, California 95014
 
MARISSA REIS .....................................    3,814          3,814          0
  676 Bellflower #38
  Sunnyvale, California 94086
 
BEN RENDEL .......................................    2,860          2,860          0
  22 Tel Chai Str
  Ranana 43405
  Israel
 
RONALD A. ROHRER .................................   19,070         19,070          0
  2310 Vintage Hill Drive
  Durham, North Carolina 27712
 
MICHELLE ROSENBERG ...............................    1,787          1,787          0
  1039L El Monte Avenue #232
  Mountain View, California 94040
 
STEVEN E. SCHER ..................................    1,986          1,986          0
  137 Dartmouth Drive #4
  San Mateo, California 94402
</TABLE>
 
                                       15
<PAGE>
<TABLE>
<CAPTION>
                                                    NUMBER OF                  NUMBER OF
                                                     SHARES                      SHARES
                                                    BENEFICIALLY               BENEFICIALLY
                                                      OWNED      NUMBER OF       OWNED
                                                    PRIOR TO      SHARES       AFTER THE
NAME AND ADDRESS OF SELLING STOCKHOLDERS            OFFERING   BEING OFFERED    OFFERING
- --------------------------------------------------  ---------  -------------   ----------
<S>                                                 <C>        <C>             <C>
BEN SHELEF .......................................      953            953          0
  19046 Laurel Drive
  Los Gatos, California 95033
 
RAJVIR SINGH .....................................  157,407        157,407          0
  1055 Fremont Avenue
  Los Altos, California 94024
 
SWADESH SINGH ....................................       47             47          0
  1055 Fremont Avenue
  Los Altos, California 94024
 
DANIEL C. SKILKEN ................................    1,907          1,907          0
  17960 Andrews Street
  Monte Sereno, California 95030
 
JEFFREY L. SOBIERAJ ..............................    5,244          5,244          0
  36 Via Di Nola
  Laguna Niguel, California 92677
 
WARREN STAPLETON .................................   31,465         31,465          0
  15935 Camino Del Cerro
  Los Gatos, California 95032
 
WARREN STAPLETON AND PAMELA STAPLETON ............    7,866          7,866          0
  15935 Camino Del Cerro
  Los Gatos, California 95032
 
ELIEZER STERNHEIM ................................  345,326        345,326          0
  3489 South Court Street
  Palo Alto, California 94306
 
YONA STERNHEIM ...................................       47             47          0
  3489 South Court Street
  Palo Alto, California 94306
 
LEK TAYLOR .......................................    2,065          2,065          0
  2305 Old Post Way
  San Jose, California 95132
 
PETER S. TESHIMA .................................   41,080         41,080          0
  2947 Shannon Court
  Santa Clara, California 95051
 
ASHWATH THIRUMALAI ...............................    2,065          2,065          0
  100 North Whisman Road, #230
  Mountain View, California 94043
 
TRICONT ASSOCIATES, LTD. .........................   68,652         68,652          0
  P.O. Box 3412
  Jerusalem, Israel 91033
 
JEFFREY M. WEINBERG ..............................    4,628          4,628          0
  1239 Sabal Drive
  San Jose, California 95132
</TABLE>
 
                                       16
<PAGE>
<TABLE>
<CAPTION>
                                                    NUMBER OF                  NUMBER OF
                                                     SHARES                      SHARES
                                                    BENEFICIALLY               BENEFICIALLY
                                                      OWNED      NUMBER OF       OWNED
                                                    PRIOR TO      SHARES       AFTER THE
NAME AND ADDRESS OF SELLING STOCKHOLDERS            OFFERING   BEING OFFERED    OFFERING
- --------------------------------------------------  ---------  -------------   ----------
<S>                                                 <C>        <C>             <C>
JEFFREY M. WEINBERG & MELINDA L. WEINBERG ........    2,840          2,840          0
  1239 Sabal Drive
  San Jose, California 95132
 
VANCE WILLIAM ....................................      953            953          0
  1402 East San Fernando Street
  San Jose, California 95116
                                                    ---------  -------------        -
 
  TOTALS..........................................  1,256,005    1,256,005          0
                                                    ---------  -------------        -
                                                    ---------  -------------        -
</TABLE>
 
                                       17
<PAGE>
                              PLAN OF DISTRIBUTION
 
    The shares offered hereby may be sold by the selling stockholders at various
times in one or more of the following transactions:
 
    - in the over-the-counter market;
 
    - on The Nasdaq National Market;
 
    - in privately negotiated transactions; or
 
    - in a combination of any of the above transactions.
 
    The selling stockholders may sell their shares at market prices prevailing
at the time of sale, at prices related to such prevailing market prices, at
negotiated prices or at fixed prices.
 
    The selling stockholders may use broker-dealers to sell their shares. If
this happens, broker-dealers will either receive discounts or commissions from
the selling stockholders, or they will receive commissions from purchasers of
shares for whom they acted as agents.
 
                          DESCRIPTION OF CAPITAL STOCK
 
   
    The authorized capital stock of Avant! consists of 75,000,000 shares of
common stock, and 5,000,000 shares of preferred stock, $.0001 par value. As of
March 5, 1999, there were 33,246,253 shares of common stock issued and
outstanding and no shares of preferred stock issued and outstanding.
    
 
COMMON STOCK
 
    Holders of shares of Avant! common stock are entitled to one vote per share
on all matters to be voted on by stockholders. Subject to the preferences that
may be applicable to any outstanding preferred stock, holders of Avant! common
stock are entitled to receive ratably such dividends, if any, as may be declared
from time to time by the Avant! board of directors out of funds legally
available therefor. In the event of a liquidation, dissolution, or winding up of
Avant!, holders of Avant! common stock are entitled to share ratably in all
assets remaining after payment of liabilities, subject to prior distribution
rights of the preferred stock, if any, then outstanding. Holders of Avant!
common stock have no preemptive or conversion rights or other subscription
rights. No redemption or sinking fund provisions apply to the common stock. All
outstanding shares of Avant! common stock are fully paid and nonassessable.
 
PREFERRED STOCK
 
    Avant!'s certificate of incorporation authorizes 5,000,000 shares of
preferred stock. The Avant! board of directors has the authority to cause Avant!
to issue the preferred stock in one or more series and to fix the rights,
preferences, privileges and restrictions thereof, including dividend rights,
conversion rights, voting rights, terms of redemption, liquidation preferences
and the number of shares constituting any series or the designation of such
series, without any further vote or action by the stockholders. In connection
with the rights agreement (described below), Avant! has authorized a series of
75,000 shares of preferred stock designated Series A Junior Participating
Preferred Stock. The issuance of preferred stock may have the effect of
delaying, deferring or preventing a change in control of Avant! without further
action by the stockholders and could adversely affect the rights and powers,
including voting rights, of the holders of Avant! common stock. In certain
circumstances, this could have the effect of decreasing the market price of the
Avant! common stock. At present, Avant! has no plans to issue any of the
preferred stock. For a description of the terms of the Series A Junior
Participating Preferred Stock, see "--Antitakeover Effects of Rights Plan,
Provisions of the Certificate of Incorporation, Bylaws and Delaware Law;
Preferred Stock Rights Plan."
 
                                       18
<PAGE>
ANTITAKEOVER EFFECTS OF RIGHTS PLAN, PROVISIONS OF THE CERTIFICATE OF
  INCORPORATION, BYLAWS AND DELAWARE LAW
 
    PREFERRED STOCK RIGHTS PLAN
 
    On September 4, 1998, our board of directors declared a dividend of one
preferred share purchase right for each share of common stock outstanding on
October 2, 1998. Each preferred share purchase right entitles the registered
holder to purchase from Avant! one one-thousandth of a share of Series A Junior
Participating Preferred Stock of Avant! at a price of $100.00 per one
one-thousandth of a preferred share. The description and terms of the preferred
share purchase rights are set forth in full in a rights agreement between Avant!
and Harris Trust Company of California.
 
    Until the public announcement or disclosure that a person or group of
affiliated or associated persons has acquired certain beneficial ownership of
Avant! or, unless our board of directors determines otherwise, the commencement
of, or announcement of an intention to make, a tender or exchange offer for more
than 15% (or in the case of certain persons, a greater percent) of Avant! common
stock, the preferred share purchase rights will be transferred with and only
with the common stock. As soon as practicable after one of these events,
separate certificates evidencing the preferred share purchase rights will be
mailed to holders of record of the common stock as of the close of business on
the date of the event that triggered the distribution of the preferred share
purchase rights.
 
    Upon the acquisition of more than 15% (or in the case of certain persons, a
greater percent) of Avant! common stock, the preferred share purchase rights
owned by a person or group of affiliated or associated persons whose ownership
is in excess of such percentage shall immediately become void. However, after
the occurrence of such aquisition, all other holders of a preferred share
purchase right will thereafter have the right to receive upon exercise of the
right that number of shares of common stock having a market value of two times
the exercise price of the preferred share purchase right. If Avant! does not
have a sufficient number of shares of common stock to satisfy the obligation to
issue common stock, or if the board of directors so elects, Avant! shall deliver
upon payment of the exercise price of a preferred share purchase right an amount
of cash or securities equivalent in value to the common stock issuable upon
exercise of a preferred share purchase right.
 
    In the event that, at any time after the purchase of sufficient shares to
trigger the bargain purchase right described in the previous paragraph, Avant!
is acquired in a merger or other business combination transaction or 50% or more
of its consolidated assets or earning power are sold, proper provision will be
made so that each holder of a preferred share purchase right will thereafter
have the right to receive, upon the exercise of the right at the then current
exercise price of the preferred share purchase right, that number of shares of
common stock of the acquiring company which at the time of such transaction will
have a market value of two times the exercise price of the preferred share
purchase right.
 
    At any time after the purchase of sufficient shares to trigger the bargain
purchase right described above and prior to the acquisition by any person or
group of a majority of the outstanding shares of common stock, the board of
directors of Avant! may exchange the preferred share purchase rights (other than
preferred share purchase rights owned by such person or group which have become
void), in whole or in part, at an exchange ratio of one share of common stock
per preferred share purchase right (subject to adjustment).
 
    The preferred share purchase rights are not exercisable until the occurrence
of one of the events described above that triggers the distribution of the
rights. The preferred share purchase rights will expire on September 4, 2008,
unless the expiration date is extended or unless the preferred share purchase
rights are earlier redeemed by Avant!. Until a preferred share purchase right is
exercised, the holder thereof, as such, will have no rights as a stockholder of
Avant!.
 
    The preferred share purchase rights have certain anti-takeover effects. The
preferred share purchase rights will cause substantial dilution to a person or
group that attempts to acquire Avant! without
 
                                       19
<PAGE>
conditioning the offer on the preferred share purchase rights being redeemed.
However, the preferred share purchase rights should not interfere with any
tender offer or merger approved by Avant! because the preferred share purchase
rights may be redeemed by the board of directors at any time prior to the
purchase of more than 15% (or in the case of certain persons, a greater percent)
of Avant! common stock.
 
    CERTIFICATE OF INCORPORATION AND BYLAWS
 
    Avant!'s certificate of incorporation provides that all stockholder action
must be effected at a duly called meeting and not by a consent in writing. In
addition, Avant!'s amended and restated bylaws do not permit stockholders of
Avant! to call a special meeting of stockholders and also require stockholders
to give timely prior notice for director nominations or other business that a
stockholder wishes to properly bring before a meeting of stockholders. These
provisions of the certificate of incorporation and bylaws could discourage
potential acquisition proposals and could delay or prevent a change in control
of Avant!. Such provisions are intended to enhance the likelihood of continuity
and stability in the composition of the Avant! board of directors and in the
policies formulated by the Avant! board of directors and to discourage certain
types of transactions that may involve an actual or threatened change of control
of Avant!. In addition, these provisions are designed to reduce the
vulnerability of Avant! to an unsolicited acquisition proposal and are intended
to discourage certain tactics that may be used in proxy fights. However, such
provisions could have the effect of discouraging others from making tender
offers for Avant!'s shares and, as a consequence, they also may inhibit
fluctuations in the market price of Avant!'s shares that could result from
actual or rumored takeover attempts. Such provisions also may have the effect of
preventing changes in the management of Avant!.
 
    DELAWARE ANTITAKEOVER STATUTE
 
    Because we are incorporated in Delaware, we are subject to Section 203 of
the Delaware General Corporation Law. These provisions prohibit certain large
stockholders, in particular those owning 15% or more of our outstanding voting
stock, from consummating a merger or business combination with Avant!, unless
(a) 66 2/3% of the shares of voting stock not owned by this large stockholder
approve the merger or business combination or (b) our board of directors
approves the merger or business combination or the transaction that resulted in
the large stockholder owning 15% or more of our outstanding voting stock.
 
                                 LEGAL MATTERS
 
    The legality of the securities offered hereby will be passed upon for Avant!
by Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, Menlo Park,
California.
 
                                    EXPERTS
 
    The consolidated balance sheets of Avant! and its subsidiaries as of
December 31, 1997 and 1996 and the consolidated statements of income,
stockholders' equity, and cash flows for each of the years in the three year
period ended December 31, 1997 incorporated in this prospectus by reference from
Avant!'s June 11, 1998 Current Report on Form 8-K/A are incorporated herein by
reference in reliance upon the reports of KPMG LLP, independent certified public
accountants, and upon the authority of said firm as experts in accounting and
auditing.
 
    The consolidated financial statements of Technology Modeling Associates,
Inc. as of December 31, 1996 incorporated in this prospectus by reference from
Avant!'s June 11, 1998 Current Report on Form 8-K/A have been audited by Arthur
Andersen LLP, independent public accountants, as indicated in their report with
respect thereto, and are incorporated by reference in reliance upon the
authority of said firm as experts in giving said reports.
 
                                       20
<PAGE>
                      WHERE YOU CAN FIND MORE INFORMATION
 
    We file annual, quarterly and special reports, proxy statements and other
information with the SEC. You may read and copy any document we file at the
SEC's public reference rooms in Washington, D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public reference rooms. Our SEC filings are also available to the public
from the SEC's website at "http://www.sec.gov."
 
    The SEC allows us to "incorporate by reference" the information we file with
them, which means that we can disclose important information to you by referring
you to those documents. The information incorporated by reference is considered
to be part of this prospectus, and information that we file later with the SEC
will automatically update and supersede this information. We incorporate by
reference the documents listed below and any future filings we will make with
the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act
of 1934:
 
    1.  Annual Report on Form 10-K for the fiscal year ended December 31, 1997;
 
    2.  Quarterly Report on Form 10-Q for the quarters ended March 31, 1998,
       June 30, 1998 and September 30, 1998;
 
    3.  Current Reports on Form 8-K dated January 30, 1998, September 18, 1998,
       November 19, 1998 and December 22, 1998;
 
    4.  Current Report on Form 8-K/A dated June 11, 1998; and
 
    5.  The description of Avant!'s Common Stock contained in its Registration
       Statement on Form 8-A as filed with the Commission on April 12, 1995.
 
    You may request a copy of these filings, at no cost, by writing to us at the
following address:
 
                               Avant! Corporation
                             46871 Bayside Parkway
                           Fremont, California 94538
                            Attn: Investor Relations
 
    This prospectus is part of a registration statement we filed with the SEC.
You should rely only on the information or representations provided in this
prospectus. We have authorized no one to provide you with different information.
We are not making an offer of these securities in any state where the offer is
not permitted. You should not assume that the information in this prospectus is
accurate as of any date other than the date on the front of the document.
 
                                       21
<PAGE>
                                1,256,005 SHARES
                               AVANT! CORPORATION
                                  COMMON STOCK
 
                               ------------------
 
   
                                 MARCH   , 1999
    
 
                            ------------------------
<PAGE>
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
   
    The following table sets forth all expenses, other than the underwriting
discounts and commissions, payable by the Registrant in connection with the sale
of the common stock being registered. All the amounts shown are estimates except
for the registration fee.
    
 
<TABLE>
<S>                                                              <C>
Securities and Exchange Commission Registration Fee............  $ 6,023.17
Legal Fees and Expenses........................................  150,000.00
Accounting Fees and Expenses...................................   50,000.00
Transfer Agent and Registrar Fees..............................    2,500.00
Miscellaneous..................................................    1,476.83
                                                                 ----------
  Total........................................................  $210,000.00
                                                                 ----------
                                                                 ----------
</TABLE>
 
ITEM 15. INDEMNIFICATION OF OFFICERS AND DIRECTORS.
 
    Section 145 of the Delaware General Corporation law ("DGCL") empowers a
Delaware corporation to indemnify any persons who are, or are threatened to be
made, parties to any threatened, pending or completed legal action, suit or
proceedings, whether civil, criminal, administrative or investigative (other
than action by or in the right of such corporation), by reason of the fact that
such person was an officer or director of such corporation, or is or was serving
at the request of such corporation as a director, officer, employee or agent of
another corporation or enterprise. The indemnity may include expenses (including
attorneys' fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred by such person in connection with such action, suit or
proceeding, provided that such officer or director acted in good faith and in a
manner he reasonably believed to be in or not opposed to the corporation's best
interests, and, for criminal proceedings, had no reasonable cause to believe his
conduct was illegal. A Delaware corporation may indemnify officers and directors
in an action by or in the right of the corporation under the same conditions,
except that no indemnification is permitted without judicial approval if the
officer or director is adjudged to be liable to the corporation in the
performance of his duty. Where an officer or director is successful on the
merits or otherwise in the defense of any action referred to above, the
corporation must indemnify him against the expenses which such officer or
director actually and reasonably incurred.
 
    In accordance with the DGCL, Avant!'s Certificate of Incorporation
("Certificate") contains a provision to limit the personal liability of the
directors of Avant! for violations of their fiduciary duty as a director. This
provision eliminates each director's liability to Avant! or its stockholders for
monetary damages except (i) for any breach of the director's duty of loyalty to
Avant! or its stockholders, (ii) for acts or omissions not in good faith or
which involve intentional misconduct or a knowing violation of law, (iii) under
Section 174 of the DGCL providing for liability of directors for unlawful
payment of dividends or unlawful stock purchases or redemptions, or (iv) for any
transaction from which a director derived an improper personal benefit. The
effect of this provision is to eliminate the personal liability of directors for
monetary damages for actions involving a breach of their fiduciary duty of care,
including any such actions involving gross negligence.
 
    Article XI of Avant!'s Certificate and Article VII, Section 6 of Avant!'s
Bylaws provide for indemnification of the officers and directors of Avant! to
the fullest extent permitted by applicable law.
 
    Avant! has entered into indemnification agreements with each director and
executive officer which provide indemnification to such directors and executive
officers under certain circumstances for acts or omissions which may not be
covered by directors' and officers' liability insurance.
 
                                      II-1
<PAGE>
ITEM 16. EXHIBITS.
 
    The exhibits listed in the Exhibit Index as filed as part of this
Registration Statement.
 
    (a) Exhibits
 
   
<TABLE>
<CAPTION>
  EXHIBIT
  NUMBER     DESCRIPTION
- -----------  --------------------------------------------------------------------------------------------------------
<C>          <S>
       2.1   Agreement and of Reorganization dated November 4, 1998, as amended on November 12, 1998, by and among
             the Company, Artemis Merger Corporation and interHDL, Inc. (1)
 
       3.1*  Amended and Restated Certificate of Incorporation, as amended to date.
 
       3.2   Amended and Restated Bylaws. (2)
 
       3.3   Certificate of Designation. (3)
 
       4.1*  Registration Rights Agreement, dated November 13, 1998.
 
       4.2   Specimen Common Stock Certificate. (4)
 
       4.3   Rights Agreement, dated September 4, 1998 between the Company and Harris Trust Company of California.
             (3)
 
       5.1*  Opinion of Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP.
 
      23.1   Consent of KPMG LLP.
 
      23.2*  Consent of Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP (included in the opinion filed
             as Exhibit 5.1).
 
      23.3   Consent of Arthur Andersen LLP.
 
      24.1*  Power of Attorney.
</TABLE>
    
 
- ------------------------
 
 *  Previously filed
 
   
(1) Incorporated by reference from the Company's Current Report on Form 8-K
    filed with the SEC on November 19, 1998.
    
 
(2) Incorporated by reference from the Company's Registration Statement on Form
    8-K filed with the SEC on September 18, 1998.
 
(3) Incorporated by reference from the Company's Registration Statement on Form
    8-A filed with the SEC on September 18, 1998.
 
(4) Incorporated by reference from the Company's Registration Statement on Form
    S-1 (File No. 33-91128) as declared effective on June 6, 1995.
 
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: (i) to include
    any prospectus required by section 10(a)(3) of the Securities Act; (ii) to
    reflect in the prospectus any facts or events arising after the effective
    date of the Registration Statement (or the most recent post-effective
    amendment thereof) which, individually or in the aggregate, represent a
    fundamental change in the information set forth in the Registration
    Statement; and (iii) 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.
 
                                      II-2
<PAGE>
        (2) That, for the purpose of determining any liability under the
    Securities Act, each such post-effective amendment shall be deemed to be a
    new registration statement relating to the securities offered therein, and
    the offering of such securities at that time shall be deemed to be the
    initial bona fide offering thereof.
 
        (3) To remove from registration by means of a post-effective amendment
    any of the securities being registered which remain unsold at the
    termination of the offering.
 
    Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
Registrant pursuant to the 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 its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.
 
    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 Section 15(d) of the
1934 Act (and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the 1934 Act) that is incorporated by
reference in the Registration Statement shall be deemed to be a new registration
statement relating to the securities offered therein, and the offering of such
securities at that time shall be deemed to be the initial bona fide offering
thereof.
 
    For purposes of determining any liability under the Securities Act, 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.
 
                                      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 Fremont, State of California, on this 9th day of
March, 1999.
    
 
                              AVANT! CORPORATION
 
                              By:          /s/ GERALD C. HSU
                                     ------------------------------
                                             Gerald C. Hsu
                                         CHAIRMAN OF THE BOARD,
                                     PRESIDENT AND CHIEF EXECUTIVE
                                                OFFICER
 
   
    Pursuant to the requirements of the Securities Act of 1933, this
registration statement has been signed by the following persons in the
capacities and on the dates indicated.
    
 
   
<TABLE>
<CAPTION>
          SIGNATURE                        TITLE                     DATE
- ------------------------------  ---------------------------  --------------------
<C>                             <S>                          <C>
      /s/ GERALD C. HSU         Chairman of the Board,
- ------------------------------    President and Chief           March 9, 1999
        Gerald C. Hsu             Executive Officer
 
                                Head of Finance and
              *                   Administration (Principal
- ------------------------------    Financial and Accounting      March 9, 1999
        Peter Teshima             Officer)
 
              *
- ------------------------------           Director               March 9, 1999
        Eric A. Brill
 
              *
- ------------------------------           Director               March 9, 1999
     Charles L. St. Clair
 
              *
- ------------------------------           Director               March 9, 1999
       Monyuki Chimura
 
              *
- ------------------------------           Director               March 9, 1999
          Dan Taylor
</TABLE>
    
 
<TABLE>
<S>   <C>                        <C>
*By:      /s/ GERALD C. HSU
      -------------------------
            Gerald C. Hsu
          ATTORNEY-IN-FACT
</TABLE>
 
                                      II-4

<PAGE>
                                                                    EXHIBIT 23.1
 
                        CONSENT OF INDEPENDENT AUDITORS
 
The Board of Directors
Avant! Corporation
 
    We consent to incorporation by reference herein of our reports dated May 22,
1998, relating to the consolidated balance sheets of Avant! Corporation and
subsidiaries as of December 31, 1997 and 1996, and the related consolidated
statements of income, shareholders' equity, and cash flows for each of the years
in the three-year period ended December 31, 1997, and the related schedule,
which reports appear in the June 11, 1998 current report on Form 8-K/A of Avant!
Corporation, and to the reference to our firm under the heading "Experts" in the
prospectus.
 
                                                                    /s/ KPMG LLP
 
   
Mountain View, California
March 8, 1999
    

<PAGE>
                                                                    EXHIBIT 23.3
 
                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
    As independent public accountants, we hereby consent to the incorporation by
reference in this registration statement on Form S-3 of our report dated January
24, 1997 on the December 31, 1996 consolidated financial statements of
Technology Modeling Associates, Inc. included in Avant! Corporation's Form 8-K/A
filed with the Securities Exchange Commission on June 11, 1998, and to all
references to our Firm included in this registration statement.
 
                   /s/ ARTHUR ANDERSEN LLP
 
   
San Jose, California
March 5, 1999
    


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