SIEBEL SYSTEMS INC
424B3, 1998-12-16
PREPACKAGED SOFTWARE
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<PAGE>
 
                                                Filed Pursuant to Rule 424(b)(3)
                                                      Registration No. 333-68041
 
                       PROSPECTUS DATED DECEMBER 14, 1998
 
                                 [SIEBEL LOGO]
 
                                 245,996 SHARES
 
                                  COMMON STOCK
 
Selling stockholders identified in this prospectus may sell up to 245,996
shares common stock of Siebel Systems, Inc. The selling stockholders, directly
or through agents, brokers, dealers or underwriters, may sell the shares of
common stock described in this prospectus (1) on terms to be determined at the
time of a sale, (2) in transactions on the Nasdaq National Market, (3) in
privately negotiated transactions or (4) in a combination of these methods of
sale. If the selling stockholders sell shares to or through brokers or dealers,
such brokers or dealers may receive compensation in the form of discounts,
concessions or commissions from the selling stockholders. We will not receive
any proceeds from the sale of shares by the selling stockholders.
 
We will not be paying any underwriting commissions or discounts in the offering
of these shares. We will, however be paying for the expenses incurred in the
offering of the shares. We estimate these expenses to be $44,000. For their
shares, the selling stockholders will receive the purchase price of the shares
sold less any agents' commissions and underwriters' discounts and other related
expenses.
 
Selling stockholders and any agents, broker, dealers or underwriters that
participate in the sale of the shares may be considered "underwriters" as
defined in the Securities Act of 1933, and any commission they receive and any
profit on the resale of the shares they purchase may be considered underwriting
discounts or commissions under the Securities Act. We have agreed to indemnify
the selling stockholders and certain other persons against certain liabilities,
including liabilities under the Securities Act.
 
Please see "Where You Can Find More Information" on page 2 for additional
information about us on file with the United States Securities and Exchange
Commission.
 
We strongly urge you to read and consider this prospectus carefully and in its
entirety, including the matters referred to under "Risk Factors" beginning at
page 4.
 
Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is
a criminal offense.
 
                The date of this Prospectus is December 14, 1998
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
THE COMPANY................................................................   1
WHERE YOU CAN FIND MORE INFORMATION........................................   2
RISK FACTORS...............................................................   4
USE OF PROCEEDS............................................................  12
DIVIDEND POLICY............................................................  12
SELLING STOCKHOLDERS.......................................................  13
PLAN OF DISTRIBUTION.......................................................  14
LEGAL MATTERS..............................................................  14
EXPERTS....................................................................  15
</TABLE>
<PAGE>
 
                                  THE COMPANY
 
We are an industry leading provider of enterprise-class sales, marketing and
customer service information software systems. We design, develop, market and
support Siebel Enterprise Applications, a leading Internet-enabled, object
oriented client/server application software product family designed to meet the
customer information system requirements of even the largest multi-national
organizations.
 
The Siebel Enterprise Applications are comprised of a broad range of advanced
client/server application products designed to allow corporations to deploy
comprehensive customer information systems, product information systems,
competitive information systems, and decision support systems on a global
basis. Our products provide support for multiple languages and multiple
currencies with support for a number of frequently interdependent distribution
channels, including direct field sales, telesales, telemarketing, distribution,
retail and Internet-based selling.
 
The Siebel Enterprise Applications are built upon a modern technology
foundation including intranet and Internet enablement, client/server, object
oriented programming, 32-bit processing, OLE 2 automation, relational database
support for Oracle, Sybase, Informix and Microsoft and system support for
Windows 95, Windows NT, and UNIX. The Siebel Enterprise Applications are
designed to scale to meet the needs of large organizations deploying thousands
of sales, marketing and customer service professionals with very large data
storage and retrieval requirements. The Siebel Enterprise Applications are
designed to be comprehensive in their scope of functionality and are highly
configurable, allowing for highly customized industry-specific and company-
specific system deployments.
 
Our objective is to establish and maintain a global market leadership position
in the sales, marketing and customer service information systems market. Our
strategy is to provide high-end enterprise client/server sales and marketing
applications in a broad range of industries, extend its advanced technology
position, achieve universally successful customer implementations of Siebel
Enterprise Applications, expand its global sales and support capacity and
continue to leverage strategic alignment with leading third-party technology
providers, system integrators and distributors.
 
                                       1
<PAGE>
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
Our principal executive offices are located at 1855 South Grant Street, San
Mateo, CA 94402. Our telephone number is (650) 295-5000 and our e-mail address
is [email protected]. We maintain an Internet home page.
 
We have filed with the SEC a registration statement on Form S-3 to register the
common stock offered by this prospectus. However, this prospectus does not
contain all of the information contained in the registration statement and the
exhibits and schedules to the registration statement. We strongly encourage you
to carefully read the registration statement and the exhibits and schedules to
the registration statement. We also file annual, quarterly and special reports,
proxy statements and other information with the SEC.
 
You may inspect and copy such material at the public reference facilities
maintained by the SEC at Room 1024, 450 Fifth Street, N.W., Washington, D.C.
20549, as well as at the SEC's regional offices at 500 West Madison Street,
Suite 1400, Chicago, Illinois 60661 and 7 World Trade Center, Suite 1300, New
York, New York 10048. You may also obtain copies of such material from the
SEC at prescribed rates by writing to the Public Reference Section of the SEC,
450 Fifth Street, N.W., Washington, D.C. 20549.
 
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 www.sec.gov.
 
The SEC allows us to "incorporate by reference" the information contained in
documents that 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.
Information in this prospectus supersedes information incorporated by reference
which we filed with the SEC prior to the date of this prospectus, while
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. Our Annual Report on Form 10-K for the fiscal year ended December 31, 1997,
filed on March 17, 1998, including all material incorporated by reference
therein;
 
2. Our Quarterly Report on Form 10-Q for the fiscal quarter ended March 31,
1998, filed on May 15, 1998, including all material incorporated by reference
therein;
 
3. Our Quarterly Report on Form 10-Q for the fiscal quarter ended June 30,
1998, filed on August 13, 1998, including all material incorporated by
reference therein;
 
4. Our Quarterly Report on Form 10-Q for the fiscal quarter ended September 30,
1998, filed on November 13, 1998, including all material incorporated by
reference therein;
 
5. Our Current Report on Form 8-K, filed on May 19, 1998, including all
material incorporated by reference therein;
 
6. Our Current Report on Form 8-K filed on May 29, 1998, including all material
incorporated by reference therein;
 
 
                                       2
<PAGE>
 
7. Our Current Report on Form 8-K filed on November 25, 1998, including all
material incorporated by reference therein; and
 
8. The description of the common stock contained in our Registration Statement
on Form 8-A.
 
You may request a copy of these filings, at no cost to you, by writing or
telephoning us at:
 
                           Siebel Systems, Inc.
                           Attention: Investor Relations
                           1855 South Grant Street
                           San Mateo, California 94402
                           Telephone (650) 295-5000
 
Our common stock is quoted on the Nasdaq National Market under the symbol
"SEBL". The last reported sales price of the common stock on the Nasdaq
National Market ("Nasdaq") on November 24, 1998 was $23.19 per share. You may
inspect reports and other information concerning us at the offices of the
National Association of Securities Dealers, Inc., 1735 K Street, N.W.,
Washington, D.C. 20006.
 
You should rely only on the information incorporated by reference or provided
in this prospectus. We have authorized no one to provide you with different
information. 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.
 
                                       3
<PAGE>
 
                                  RISK FACTORS
 
You should carefully consider the following factors, together with the other
information contained in this prospectus and incorporated by reference, before
purchasing the Siebel common stock offered by this prospectus. An investment in
Siebel common stock involves a high degree of risk and may not be appropriate
for investors who cannot afford to lose their entire investment.
 
Limited Operating History. We began operations in July 1993. We first shipped
our Siebel Sales Enterprise product in April 1995 and our Siebel Service
Enterprise product in December 1996. Subsequent versions of these products were
first shipped in 1996 and 1997. Accordingly, we have a limited operating
history upon which you may evaluate our business and prospects. You should
evaluate our prospects in light of the risks, expenses and uncertainties that
companies in their early stage of development frequently encountered.
 
Uncertainty of Future Operating Results. Our net revenue and operating results
may fluctuate significantly because of a number of factors, many of which are
outside of our control. These factors include:
 
  .  level of product and price competition
 
  .  length of our sales cycle
 
  .  the size and timing of individual license transactions
 
  .  delay or deferral of customer implementations of our products
 
  .  success in expanding our customer support organization, direct sales
     force and indirect distribution channels
 
  .  timing of new product introductions and product enhancements
 
  .  appropriate mix of products and services sold
 
  .  levels of international sales
 
  .  activities of and acquisitions by competitors
 
  .  timing of new hires
 
  .  changes in foreign currency exchange rates
 
  .  our ability to develop and market new products and control costs
 
One or more of the foregoing factors may cause our operating expenses to be
disproportionately high during any given period or may cause our net revenue
and operating results to fluctuate significantly. Based on the preceding
factors, we may experience a shortfall in revenue or earnings or otherwise fail
to meet public market expectations, which could materially adversely affect our
business, financial condition and the market price of our common stock.
 
Fluctuations in Quarterly Operating Results. Our net revenue and operating
results may vary drastically from quarter to quarter. The main factors which
may affect these fluctuations are:
 
  .  the discretionary nature of our customer's purchase and budget cycles
 
                                       4
<PAGE>
 
  .  the size and complexity of our license transactions
 
  .  the potential delays in recognizing revenue from license transactions
 
  .  seasonal variations in operating results
 
  .  variations in the fiscal or quarterly cycles of our customers
 
Each customer's decision to implement our products and services is
discretionary, involves a significant commitment of resources and is subject to
their budget cycles. In addition, the timing of license revenue is difficult to
predict because of the length and variability of our sales cycle, which has
ranged to date from two to eighteen months. We base our operating expenses on
anticipated revenue trends. Because a high percentage of these expenses are
relatively fixed, a delay in recognizing revenue from license transactions
could cause significant variations in operating results from quarter to quarter
and could result in operating losses. If these expenses precede, or are not
subsequently followed by, increased revenues, our operating results could be
materially and adversely affected. Although we have not experienced significant
seasonal variations in operating results, such variations could cause quarterly
revenues and operating results to vary if they were to develop.
 
As a result of these and other factors, revenues for any quarter are subject to
significant variation, and we believe that period-to-period comparisons of our
results of operations are not necessarily useful. You should not rely on these
comparisons as indications of future performance. It is likely that our future
quarterly operating results from time to time will not meet the expectations of
market analysis or investors, which would likely have an adverse effect on the
price of our common stock.
 
Reliance on Systems Integrators and Other Relationships. We have established
strategic relationships with a number of organizations that we believe are
important to our sales, marketing and support activities and the implementation
of our products. We believe that our relationships with these organizations
provide marketing and sales opportunities for our direct sales force and expand
the distribution of our products. These relationships allow us to keep pace
with the technological and marketing developments of major software vendors and
provide us with technical assistance for our product development efforts.
 
In particular, we have established a non-exclusive strategic relationship with
Andersen Consulting, one of our principal stockholders. The Company has also
entered into significant relationships with other third-party systems
integrators. A significant portion of our revenues has historically been
derived from customers for which Andersen Consulting or other systems
integrators with which the Company has a significant relationship had been
engaged to provide system integration services. Any deterioration of our
relationship with Andersen Consulting could have a material adverse effect on
our business, financial condition and results of operations. We also have
relationships with Microsoft Corporation, Compaq Computer Corporation, Itochu
Corporation and Itochu Techno-Science Corporation, among others. Our failure to
maintain existing relationships, or to establish new relationships in the
future, could have a material adverse effect on our business, results of
operations and financial condition.
 
Our current and potential customers may also rely on third-party system
integrators to develop, deploy and/or manage Siebel Enterprise Applications. If
we do not adequately train a sufficient number of system integrators or, if
these integrators do not have or devote the resources necessary to implement
our products, our business, operating results and financial condition could be
materially and adversely affected.
 
 
                                       5
<PAGE>
 
Dependence on the Internet. The Siebel Enterprise Applications communicate
through public and private networks over the internet. The success of our
products may depend, in part, on our ability to develop products which are
compatible with the Internet. We cannot predict with any assurance whether the
Internet will be a viable commercial marketplace or whether the demand for
Internet-related products and services will increase or decrease in the future.
The increased commercial use of the Internet could require substantial
modification and customization of our products and the introduction of new
products. We may not be able to effectively migrate our products to the
Internet or successfully compete in the Internet-related products and services
market.
 
Critical issues concerning the commercial use of the Internet, including
security, reliability, cost, ease of use, accessibility, quality of service and
potential tax or other government regulation, remain unresolved and may affect
the use of the Internet as a medium to support the functionality of our
products and distribution of our software. If these critical issues are not
favorably resolved, our business, operating results and financial condition
could be materially and adversely affected.
 
Risk Associated with Emerging Client/Server and Customer Information
Markets. The market for client/server application software is relatively new,
highly competitive and rapidly changing. We market our products only to
customers who have migrated or are in the process of migrating their enterprise
computing systems to client/server computing environments. Our future financial
performance will partly depend on the continued growth of organizations
successfully adopting client/server computing environments. If the
client/server market fails to grow or grows more slowly than we currently
anticipate, our business, operating results and financial condition could be
materially and adversely affected.
 
The market for customer information software is also highly competitive and
rapidly changing. Our future financial performance will largely depend on
growth in the number of customer information applications developed for use in
client/server environments. If the customer information software market fails
to grow or grows more slowly than we currently anticipate, our business,
operating results and financial condition would be materially and adversely
affected.
 
Limited Implementation of our Products by our Customers. Many of our customers
purchase and implement our products in phases. Our customers frequently deploy
our products to large numbers of sales, marketing and customer service
personnel. These end-users may not accept our products. Our products are also
being deployed on a variety of computer hardware platforms and used with a
number of third-party software applications and programming tools. This use may
present significant technical challenges, particularly as large numbers of
personnel attempt to use our product concurrently. If existing customers have
difficulty further deploying Siebel Enterprise Applications or for any other
reason are not satisfied with Siebel Enterprise Applications, our business,
operating results and financial condition could be materially and adversely
affected.
 
Reliance on a Limited Number of Products. In 1997, a substantial majority of
our license revenues were attributable to sales of Siebel Sales Enterprise,
Siebel Service Enterprise and related products. We expect that such products
and related consulting, maintenance and training services will continue to
account for a substantial majority of our future revenues. As a result, factors
adversely affecting the pricing of or demand for such products, such as
competition or technological change, could have a material adverse effect on
our business, operating results and financial condition.
 
                                       6
<PAGE>
 
Lengthy Sales and Implementation Cycles. The timing of the sales and
implementation of our products and services is not predictable with any degree
of accuracy. You should not rely on prior sales and implementation cycles as
any indication of future cycles.
 
The length of time required to implement our products often depends on factors
outside our control. These factors include (1) the size and complexity of our
license transactions and (2) delays in our customers' implementation of
client/server computing environments. A delay in the sale or implementation of
even a limited number of license transactions could have a material adverse
effect on our business and operations and cause our operating results to vary
significantly from quarter to quarter.
 
Risks Associated with Expanding Distribution. We have expanded the distribution
of our products in recent years. This expansion has placed new and increased
demands on our direct sales force and technical and sales support staff. Our
ability to achieve revenue growth in the future will depend, in part, on our
success in recruiting and training sufficient direct sales, technical and
customer support personnel. Although we invest significant resources to expand
our direct sales force and our technical and customer support staff, we have
experienced difficulty in recruiting qualified personnel. We also may not be
able to successfully expand our direct sales force or other distribution
channels. In addition, such expansion may not result in increased revenues. Any
failure to expand our direct sales force or technical and customer support
staff or to expand our distribution channels could materially and adversely
affect our business, operating results and financial condition.
 
Dependence on Large License Fee Contracts and Customer Concentration. Our
success depends on maintaining relationships with our existing customers. A
relatively small number of customers have accounted for a significant
percentage of our revenues. Sales to our 10 largest customers in each fiscal
year have accounted for a majority of our revenues during that period. We
expect that sales of our products to a limited number of customers will
continue to account for a significant percentage of revenue for the foreseeable
future. The loss of a small number of customers or any reduction or delay in
orders by any such customer, or the failure of us to market successfully our
products to new customers could have a material adverse effect on our business,
financial condition and results of operations.
 
Risk Associated with New Versions and New Products; Rapid Technological
Change. The software market in which we compete is characterized by (1) rapid
technological change, (2) frequent introductions of new products, (3) changing
customer needs and (4) evolving industry standards. To keep pace with
technological developments, evolving industry standards and changing customer
needs, we must support existing products and develop new products. We may not
be successful in developing, marketing and releasing new products or new
versions of the Siebel Enterprise Applications that respond to technological
developments, evolving industry standards or changing customer requirements. We
may also experience difficulties that could delay or prevent the successful
development, introduction and sale of these enhancements. In addition, these
enhancements may not adequately meet the requirements of the marketplace and
may not achieve any significant degree of market acceptance. If release dates
of any future products or enhancements to the Siebel Enterprise Applications
are delayed, or if these products or enhancements fail to achieve market
acceptance when released, our business, operating results and financial
condition could be materially and
 
                                       7
<PAGE>
 
adversely affected. In addition, new products or enhancements by our
competitors may cause customers to defer or forgo purchases of our products,
which could have a material adverse effect on our business, financial condition
and results of operations.
 
Competition. Our products target the customer information systems market. This
market is highly competitive, rapidly changing and significantly affected by
new product introductions. We face competition primarily from our customers'
internal information technology departments and systems integrators, as well as
from other application software providers that offer a variety of products and
services to address this market. Many of our customers and potential customers
have attempted to develop customer information systems, in-house either alone
or with the help of systems integrators. We may not be able to compete
successfully against such internal development efforts.
 
We rely on a number of systems consulting and systems integration firms for
implementation and other customer support services, as well as for
recommendations of our products during the evaluation stage of the purchase
process. Although we seek to maintain close relationships with these service
providers, many of them have similar, and often more established, relationships
with our competitors. If we are unable to develop and retain effective, long-
term relationships with these third parties, our competitive position could be
materially and adversely affected. Further, many of these third parties have
significantly greater resources than we do and may market software products
which compete with us.
 
The following table lists some of our current and potential competitors and
their products.
 
<TABLE>
<CAPTION>
   COMPANY NAME                                   PRODUCT
   ------------                                   -------
   <S>                                            <C>
   Acxiom........................................ DirectMedia
   Baan N.V./Aurum Software, Inc. ............... FrontOffice
   Borealis Corporation.......................... Arsenal
   Clarify, Inc. ................................ ClearSales, ClearSupport
   Dendrite International, Inc. ................. Force One; Dendrite Series 6
   Early Cloud & Co. ............................ CallFlow
   Exchange Applications......................... ValEX
   IMA........................................... EDGE
   Marketrieve Company........................... Marketrieve PLUS
   Metrix, Inc. ................................. Field Service Dispatch
   Onyx.......................................... Customer Center
   Oracle Corporation............................ Oracle Sales and Marketing
   Pegasystems, Inc. ............................ PegaSURE; PegaWorks; PegaSales
   Pivotal Software, Inc......................... Relationship
   Prime Response................................ Prime Vantage
   Sales Vision.................................. Jsales
   SAP A.G. ..................................... Focus (not yet released)
   Saratoga Systems.............................. Avenue
   Symantec...................................... ACT!
   The Vantive Corporation....................... Vantive Enterprise
   Trilogy Development Group, Inc................ SC Config
</TABLE>
 
Some of these competitors have longer operating histories, significantly
greater financial, technical, marketing and other resources, significantly
greater name recognition and a larger installed base of customers than we do.
In addition, many competitors have well-established relationships with our
 
                                       8
<PAGE>
 
current and potential customers. As a result, these competitors may be able to
respond more quickly to new or emerging technologies and changes in customer
requirements, or to devote greater resources to the development, promotion and
sale of their products, than we can.
 
There are many factors that may increase competition in the customer
information systems market, including (1) entry of new competitors, (2)
alliances among existing competitors and (3) consolidation in the software
industry. Increased competition may result in price reductions, reduced gross
margins or loss of market share, any of which could materially adversely affect
our business, operating results and financial condition. If we cannot compete
successfully against current and future competitors or overcome competitive
pressures, our business, operating results and financial condition may be
adversely affected.
 
Reliance on Third-Party Vendors. Portions of our products incorporate software
that was developed and is maintained by third-party software developers.
Although we believe there are other sources for these products, any significant
interruption in the supply of these products could adversely impact our sales
unless and until we can secure another source. We depend in part on these third
parties' abilities to enhance their current products, to develop new products
on a timely and cost-effective basis and to respond to emerging industry
standards and other technological changes. We may not be able to replace the
functionality provided by the third-party software currently offered with our
products if that software becomes obsolete or incompatible with future versions
of our products or is not adequately maintained or updated. The absence of or
any significant delay in the replacement of that functionality could materially
adversely affect our sales.
 
Risk of Product Defects. Software products frequently contain errors or
failures, especially when first introduced or when new versions are released.
Although we conduct extensive product testing during product development, we
have been forced to delay the commercial release of products until the
correction of software problems. We could lose revenues as a result of software
errors or defects. Our products are intended for use in sales applications that
may be critical to a customer's business. As a result, we expect that our
customers and potential customers will have a greater sensitivity to product
defects than the market for software products generally. Testing errors may
also be found in new products or releases after commencement of commercial
shipments, resulting in loss of revenue or delay in market acceptance, damage
to our reputation, or increased service and warranty costs, any of which could
have a material adverse effect upon our business, operating results and
financial condition.
 
Management of Growth. Our business has grown rapidly in the recent years. This
growth has placed a significant strain on our management systems and resources.
To manage future growth we must continue to (1) improve our financial and
management controls, reporting systems and procedures on a timely basis and (2)
expand, train and manage our employee work force. If we fail to manage our
growth effectively, our business, financial condition and results of operations
could be materially and adversely affected.
 
Dependence on Key Personnel. Our performance depends on the continued service
of our key technical, sales and senior management personnel, particularly
Thomas M. Siebel, our Chairman and Chief Executive Officer. None our key
employees has entered into an employment agreement with us. The loss of the
services of one or more of our executive officers could have a material adverse
effect on our business, operating results and financial condition.
 
                                       9
<PAGE>
 
Limited Protection of Proprietary Information; Risks of Infringement. We rely
primarily on a combination of patent, copyright, trade secret and trademark
laws, confidentiality procedures and contractual provisions to protect our
proprietary rights. We also believe that the technological and creative skills
of our personnel, new product developments, frequent product enhancements, name
recognition and reliable product maintenance are essential to establishing and
maintaining a technology leadership position. We seek to protect our software,
documentation and other written materials under patent, trade secret and
copyright laws, which afford only limited protection. Any patents issued to us
may be invalidated, circumvented or challenged. Any of our pending or future
patent applications, whether or not being currently challenged, may not be
issued with the scope of the claims we seek, if at all. Furthermore, others may
develop technologies that are similar or superior to our technology or design
around our patents. Despite our efforts to protect our proprietary rights,
unauthorized parties may attempt to copy aspects of our products or to obtain
and use information what we regard as proprietary. Policing unauthorized use of
our products is difficult. In addition, the laws of some foreign countries do
not protect our proprietary rights as fully as do the laws of the United
States. Our means of protecting our proprietary rights in the United States or
abroad may not be adequate. We have entered into agreements with substantially
all of our customers which require us to place Siebel Enterprise Applications
source code into escrow. Such agreements generally provide that such parties
will have a limited, non-exclusive right to use such code if (1) there is a
bankruptcy proceeding by or against us, (2) we cease to do business, or (3) we
fail to meet our support obligations.
 
Although we do not believe that we are infringing any proprietary rights of
others, third parties may claim that we have infringed their intellectual
property rights. Furthermore, former employers of our former, current or future
employees may assert claims that such employees have improperly disclosed to us
the confidential or proprietary information of such former employers. Any such
claims, with or without merit, could (1) be time consuming to defend, (2)
result in costly litigation, (3) divert management's attention and resources,
(4) cause product shipment delays, and (5) require us to pay money damages or
enter into royalty or licensing agreements. A successful claim of product
infringement against us and our failure or inability to license or create a
workaround for such infringed or similar technology may materially and
adversely affect our business, operating results and financial condition.
 
We license certain software from third parties. These third-party software
licenses may not continue to be available to us on acceptable terms. The loss
of, or inability to maintain, any of these software licenses could result in
shipment delays or reductions. This could materially adversely affect our
business, operating results and financial condition.
 
Year 2000 Risks. While we believe that most of our currently developed and
actively marketed products are Year 2000 compliant for significantly all
functionality, our software products could contain errors or defects relating
to Year 2000. We believe that the current versions of our products are Year
2000 compliant.
 
We have completed an assessment of our computer systems and software and are
modifying or replacing portions of our software so that our operating systems
will function properly with respect to dates in the Year 2000 and thereafter.
We are currently evaluating system interfaces with third-party systems, such as
our key vendors and system integrators, for Year 2000 functionality. The Year
 
                                       10
<PAGE>
 
2000 project cost is not expected to be material. The project is estimated to
be significantly completed during the 1998 calendar year. We believe that, with
modifications to existing software and conversions to new software, the Year
2000 issue will not pose significant operational problems for our computer
systems. However, if such modifications and conversions are not made, or are
not completed in a timely manner, the Year 2000 issue could have a material
adverse impact on our operations. Additionally, the systems of other companies
with which we do business may not address any Year 2000 problems on a timely
basis, which could have an adverse effect on our systems or business
transactions. We believe that our exposure on Year 2000 issues is not material
to our business as a whole.
 
Risks Associated with International Operations. Our revenues are primarily
derived from large multi-national companies. To service the needs of these
companies, we must provide worldwide product support services. We have
expanded, and intend to continue expanding, our international operations and
enter additional international markets. This will require significant
management attention and financial resources that could adversely affect our
operating margins and earnings. We may not be able to maintain or increase
international market demand for Siebel Enterprise Applications. If we do not,
our international sales will be limited, and our business, operating results
and financial condition could be materially and adversely affected.
 
Our international operations are subject to a variety of risks, including (1)
foreign currency fluctuations, (2) economic or political instability, (3)
shipping delays and (4) various trade restrictions. Any of these risks could
have a significant impact on our ability to deliver products on a competitive
and timely basis. Significant increases in the level of customs duties, export
quotas or other trade restrictions could also have an adverse effect on our
business, financial condition and results of operations. In situations where
direct sales are denominated in foreign currency, any fluctuation in foreign
currency or the exchange rate may adversely affect our business, financial
condition and results of operations.
 
Product Liability. Our license agreements with our customers typically contain
provisions designed to limit our exposure to potential product liability
claims. It is possible, however, that the limitation of liability provisions
contained in our license agreements may not be effective under the laws of
certain jurisdictions. A successful product liability claim brought against us
could have a material adverse effect upon our business, operating results and
financial condition.
 
Control by Existing Stockholders. Our current officers, directors and entities
affiliated with us together beneficially owned approximately 27% of the
outstanding shares of common stock as of November 18, 1998. In particular,
Thomas M. Siebel, our Chairman and Chief Executive Officer, owned approximately
17% of the outstanding shares of common stock as of November 18, 1998. As a
result, these stockholders will be able to exercise certain control over
matters requiring stockholder approval, including the election of directors and
the approval of mergers, consolidations and sales of our assets. This may
prevent or discourage tender offers for our common stock.
 
Possible Volatility of Stock Price. Our stock price has fluctuated
substantially since our initial public offering in June 1996. The trading price
of our common stock is subject to significant fluctuations in response to
variations in quarterly operating results, the gain or loss of significant
orders, changes in earning estimates by analysts, announcements of
technological innovations or new
 
                                       11
<PAGE>
 
products by us or our competitors, general conditions in the software and
computer industries and other events or factors. In addition, the stock market
in general has experienced extreme price and volume fluctuations which have
affected the market price for many companies in industries similar or related
to ours and which have been unrelated to the operating performance of these
companies. These market fluctuations have adversely affected and may continue
to adversely affect the market price of our common stock.
 
Effect of Certain Charter Provisions; Antitakeover Effects of Certificate of
Incorporation, Bylaws and Delaware Law. Our Board of Directors is authorized to
issue up to 2,000,000 shares of Preferred Stock and to determine the price,
rights, preferences, privileges and restrictions, including voting rights, of
those shares without any further approval by our stockholders. The Preferred
Stock could be issued with voting, liquidation, dividend and other rights
superior to those of the common stock. The rights of the holders of common
stock will be subject to, and may be adversely affected by, the rights of the
holders of any Preferred Stock that may be issued in the future. The issuance
of Preferred Stock, while providing desirable flexibility in connection with
possible acquisitions and other corporate purposes, could make it more
difficult for a third party to acquire a majority of our outstanding voting
stock. We have instituted a classified Board of Directors in our Certificate of
Incorporation. This and certain other provisions of our Certificate of
Incorporation and certain provisions of our Bylaws and of Delaware law, could
delay or make more difficult a merger, tender offer or proxy contest.
 
                                USE OF PROCEEDS
 
We will not receive any proceeds from the sale of the shares offered by the
selling stockholders.
 
                                DIVIDEND POLICY
 
We have never paid any cash dividends on our capital stock. We currently intend
to use future earnings to finance the growth and development of our business
and do not anticipate paying any cash dividends in the foreseeable future.
 
 
                                       12
<PAGE>
 
                              SELLING STOCKHOLDERS
 
The following table sets forth the names of the selling stockholders, the
number of shares of common stock owned beneficially by each selling stockholder
as of November 18, 1998 and the number of shares which each selling stockholder
may offer by this prospectus. The selling stockholders may offer all, some or
none of their shares.
 
<TABLE>
<CAPTION>
                         SHARES BENEFICIALLY OWNED                  SHARES BENEFICIALLY OWNED
                             PRIOR TO OFFERING                           AFTER OFFERING(1)
                         ----------------------------- SHARES BEING -----------------------------
        NAME               NUMBER         PERCENT(2)     OFFERED      NUMBER         PERCENT(2)
        ----             -------------- -------------- ------------ -------------- --------------
<S>                      <C>            <C>            <C>          <C>            <C>
Thaddeus Batt...........            126             *        126                --            --
Chartiers West, Inc.....            930             *        172               758             *
Albert Craig............          4,688             *        890             3,798             *
Gregory L. Craig........         61,152             *     18,426            42,726             *
Sybil S. Craig..........          4,276             *      1,068             3,208             *
Virginia Egger..........          4,688             *        890             3,798             *
Rodd Halstead(3)........          3,999             *        710             3,289             *
Stuart Hamill...........          6,564             *      1,246             5,318             *
Wendy Hassan(4).........          1,054             *        254               800             *
Alexander Henkels.......          4,688             *        890             3,798             *
Michael Howard..........        136,292             *     36,094           100,198             *
Kenneth Jeffries........        194,056             *     67,028           127,028             *
Barry Keesan............            890             *        890                --            --
Jurgen Leschner(5)......          3,615             *      1,066             2,549             *
Shaun Logan(6)..........          3,518             *        800             2,718             *
Lonecone, Ltd...........         10,248             *      3,556             6,692             *
Staffan Lundback........          4,688             *        890             3,798             *
Salem Partners, L.P.....         87,170             *     87,170                --            --
Brian Rowles............          2,836             *        488             2,348             *
Telemark Investments,
 Inc....................         23,432             *     23,432                --            --
</TABLE>
- --------
 *  Less than one percent
 
(1) Assumes the sale of all shares offered hereby.
 
(2) Applicable percentage ownership is based on 88,931,160 shares of common
    stock outstanding (net of treasury shares) as of November 18, 1998.
 
(3) Includes 3,289 shares issuable upon exercise of outstanding options within
    60 days of September 30, 1998.
 
(4) Includes 800 shares issuable upon exercise of outstanding options within 60
    days of September 30, 1998.
 
(5) Includes 2,549 shares issuable upon exercise of outstanding options within
    60 days of September 30, 1998.
 
(6) Includes 1,000 shares issuable upon exercise of outstanding options within
    60 days of September 30, 1998.
 
 
Each of the selling stockholders held shares of InterActive WorkPlace, Inc., a
Delaware corporation. On October 1, 1997, INTW Acquisition Corp., a wholly
owned subsidiary of Siebel Systems, Inc. merged with and into InterActive (the
"merger"), and InterActive became a wholly owned subsidiary of Siebel Systems,
Inc., all pursuant to an Agreement and Plan of Merger and Reorganization
between Siebel Systems, Inc., INTW and InterActive dated as of September 13,
1997 (the "merger agreement"). Pursuant to the merger agreement, each of the
selling stockholders, in exchange for their shares in InterActive, received the
shares set forth in the table as being offered pursuant to this prospectus.
Each of the selling stockholders that were employees of InterActive have been
offered employment with us.
 
                                       13
<PAGE>
 
                              PLAN OF DISTRIBUTION
 
Under a Registration Rights Agreement between us and the selling stockholders,
dated October 1, 1997 (the "Registration Rights Agreement"), we agreed to
register the shares received by the selling stockholders in the merger and to
keep the registration statement effective until the earliest of (i) October 1,
1998 (the first anniversary of the closing of the merger), (ii) the
satisfaction of all requirements to sell all such shares under Rule 144 during
any ninety (90) day period, or (iii) the sale of all the shares under the
registration statement. Our registration of the shares of common stock does not
necessarily mean that the selling stockholders will sell all or any of the
shares.
 
We will pay substantially all expenses incurred in the offering and sale of the
common stock to the public, other than commissions, concessions and discounts
of underwriters, dealers or agents. These expenses (excluding such commissions
and discounts) are estimated to be $44,000. The Registration Rights Agreement
provides for cross-indemnification of the selling stockholders and us to the
extent permitted by law for losses, claims, damages, liabilities and expenses
arising, under certain circumstances, out of any registration of the common
stock.
 
The selling stockholders, directly or through agents, brokers, dealers or
underwriters, may sell the shares of common stock described in this prospectus
(1) on terms to be determined at the time of a sale, (2) in transactions on the
Nasdaq National Market, (3) in privately negotiated transactions or (4) in a
combination of these methods of sale. The selling stockholders may also sell
the shares to or through brokers or dealers. These brokers or dealers may
receive compensation in the form of discounts, concessions or commissions from
the selling stockholders. We will not receive any proceeds from the sale of
shares by the selling stockholders.
 
The selling stockholders and any persons who participate in the distribution of
the shares offered by this prospectus may be deemed to be underwriters within
the meaning of the Act. Any discounts, commissions or concessions received by
these underwriters and any provided for the sale of the shares by them may be
considered underwriting discounts and commissions under the Act. The selling
stockholders will be subject to the applicable provisions of the Exchange Act,
and the rules and regulations of the Exchange Act, including Rules 10b-2, 10b-6
and 10b-7, which provisions may limit the timing of purchases and sales of any
of the common stock by the selling stockholders.
 
In order to comply with the securities laws of certain states, if applicable,
the shares may be sold in such jurisdictions only through registered or
licensed brokers or dealers. In addition, in certain states the shares may not
be sold unless it has been registered or qualified for sale or an exemption
from registration or qualification requirements is available and is complied
with.
 
                                 LEGAL MATTERS
 
Cooley Godward LLP, Palo Alto, California will pass upon the validity of the
issuance of the common stock offered by this prospectus. As of the date of this
prospectus, certain members and associates of Cooley Godward own an aggregate
of 5,272 shares of common stock. In addition, James C. Gaither, a director and
the Secretary of Siebel Systems, Inc. and a partner of Cooley Godward, owns
118,414 shares of common stock and has options to purchase 188,000 shares of
common stock. Eric C. Jensen, a partner of Cooley Godward, is an Assistant
Secretary of Siebel Systems, Inc.
 
                                       14
<PAGE>
 
                                    EXPERTS
 
The consolidated financial statements and schedule of Siebel Systems, Inc. as
of December 31, 1997 and 1996, and for each of the years in the three year
period ended December 31, 1997, have been incorporated by reference herein and
in the registration statement in reliance upon the report of KPMG Peat Marwick
LLP, independent auditors and upon the authority of said firm as experts in
accounting and auditing.
 
 
                                       15
<PAGE>
 
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WE HAVE AUTHORIZED NO ONE TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS THAT ARE NOT CONTAINED IN THIS PROSPECTUS. YOU SHOULD RELY
ONLY ON THE INFORMATION INCORPORATED BY REFERENCE OR PROVIDED IN THIS
PROSPECTUS. YOU MUST NOT RELY ON ANY UNAUTHORIZED INFORMATION.
 
THIS PROSPECTUS DOES NOT OFFER TO SELL OR BUY ANY SHARES IN ANY JURISDICTION
WHERE IT IS UNLAWFUL. 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.
 
                               ----------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
The Company................................................................   1
Where You Can Find More Information........................................   2
Risk Factors...............................................................   4
Use of Proceeds............................................................  12
Dividend Policy............................................................  12
Selling Stockholders.......................................................  13
Plan of Distribution.......................................................  14
Legal Matters..............................................................  14
Experts....................................................................  15
</TABLE>
 
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                                245,996 SHARES
 
                          [SIEBEL SYSTEMS, INC. LOGO]
 
                                 COMMON STOCK
 
                               ----------------
 
                                  PROSPECTUS
 
                               ----------------
 
 
                               DECEMBER 14, 1998
 
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