MARIMBA INC
424B4, 1999-04-30
PREPACKAGED SOFTWARE
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<PAGE>   1
                                                Filed pursuant to Rule 424(b)(4)
                                                          SEC File No. 333-72353


 
                                4,000,000 Shares
                                      LOGO
                                  COMMON STOCK
 
                           -------------------------
 
     MARIMBA, INC. IS OFFERING 3,548,000 SHARES OF ITS COMMON STOCK AND THE
SELLING STOCKHOLDERS LISTED ON PAGES 60-61 ARE OFFERING 452,000 SHARES. THIS IS
OUR INITIAL PUBLIC OFFERING AND NO PUBLIC MARKET CURRENTLY EXISTS FOR OUR
SHARES.
 
                           -------------------------
 
     OUR COMMON STOCK HAS BEEN APPROVED FOR QUOTATION ON THE NASDAQ NATIONAL
MARKET UNDER THE SYMBOL "MRBA."
 
                           -------------------------
 
     INVESTING IN THE COMMON STOCK INVOLVES RISKS. SEE "RISK FACTORS" BEGINNING
ON PAGE 6.
 
                           -------------------------
 
                               PRICE $20 A SHARE
 
                           -------------------------
 
<TABLE>
<CAPTION>
                                                    UNDERWRITING                                PROCEEDS
                                 PRICE TO           DISCOUNTS AND         PROCEEDS TO          TO SELLING
                                  PUBLIC             COMMISSIONS         MARIMBA, INC.        STOCKHOLDERS
                                 --------           -------------        -------------        ------------
<S>                         <C>                  <C>                  <C>                  <C>
Per Share.................        $20.00                $1.40               $18.60               $18.60
Total.....................      $80,000,000          $5,600,000           $65,992,800          $8,407,200
</TABLE>
 
     The Securities and Exchange Commission and state securities regulators have
not approved or disapproved these securities or determined if this prospectus is
truthful or complete. Any representation to the contrary is a criminal offense.
 
     Marimba and the selling stockholders have granted the underwriters the
right to purchase up to an additional 600,000 shares of common stock to cover
over-allotments. Morgan Stanley & Co. Incorporated expects to deliver the shares
of common stock to purchasers on May 5, 1999.
 
                           -------------------------
 
MORGAN STANLEY DEAN WITTER
                 
                 CREDIT SUISSE FIRST BOSTON
 
                                   BT ALEX. BROWN
 
                                                 HAMBRECHT & QUIST
 
April 29, 1999
<PAGE>   2
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                      PAGE
                                      ----
<S>                                   <C>
Prospectus Summary..................    3
Risk Factors........................    6
Special Note Regarding
  Forward-Looking Statements........   15
Use of Proceeds.....................   16
Dividend Policy.....................   16
Capitalization......................   17
Dilution............................   18
Selected Consolidated Financial
  Data..............................   19
Management's Discussion And Analysis
  of Financial Condition and Results
  of Operations.....................   20
</TABLE>
 
<TABLE>
<CAPTION>
                                      PAGE
                                      ----
<S>                                   <C>
Business............................   31
Management..........................   48
Related Party Transactions..........   58
Principal And Selling
  Stockholders......................   60
Description Of Capital Stock........   62
Shares Eligible For Future Sale.....   65
Underwriters........................   67
Legal Matters.......................   69
Experts.............................   69
Where You Can Find More
  Information.......................   70
Index To Consolidated Financial
  Statements........................  F-1
</TABLE>
 
                            ------------------------
 
                                        2
<PAGE>   3
 
                               PROSPECTUS SUMMARY
 
     You should read the following summary together with the more detailed
information regarding Marimba and the common stock being sold in this offering
and our financial statements and notes appearing elsewhere in this prospectus.
Unless otherwise indicated, all information in this prospectus (1) gives effect
to the conversion of all outstanding shares of preferred stock into shares of
common stock effective upon the closing of the offering, (2) assumes no exercise
of the underwriters' over-allotment option and (3) assumes no exercise of an
outstanding warrant to purchase 16,865 shares of our common stock.
 
                                 MARIMBA, INC.
 
     Marimba is a leading provider of Internet-based software management
solutions that enable companies to expand their market reach, streamline
business processes and strengthen relationships with customers, business
partners and employees. Our Castanet product family provides an efficient and
reliable way for enterprises to distribute, update and manage applications and
related data over corporate intranets, extranets and the Internet.
 
     Companies are increasingly relying on the Internet to deliver business
critical applications and services to users inside and outside the enterprise.
As the Internet has evolved as a business tool, demands on its infrastructure
have grown and the enterprise computing environment is becoming more complex.
Furthermore, as business applications are increasingly being advertised and
delivered as services, companies and their customers are demanding the same high
levels of availability, ease of use and quality of service that they expect from
common utilities, including electricity and telephone systems. This has created
significant software management challenges. As a result, there is a need for a
new management solution designed specifically for the Internet.
 
     Marimba develops Internet services management solutions that enable
companies to deploy and manage e-business applications and services, which
encompass business-to-business, business-to-employee and business-to-consumer
communications and transactions over corporate intranets, extranets and the
Internet. Castanet centralizes and automates the ongoing distribution and
management of applications and services. We believe that by using Castanet,
organizations can leverage the Internet to reduce software management costs,
deliver greater functionality and improve customer loyalty. We intend to extend
the Castanet foundation to manage the array of infrastructure, systems and
components upon which business applications and services depend. The key
elements of our strategy are to extend our technological leadership position,
target companies and service providers conducting e-business, expand our
worldwide distribution channels and expand our professional service
capabilities.
 
     Our global customer base spans multiple industry segments including
financial services, insurance, retail, manufacturing and telecommunications.
Castanet customers include various industry leaders, including Bear Stearns,
Charles Schwab, EarthLink, The Home Depot, Intuit, Ingram Micro, Seagate
Technology and Sun Microsystems. We market our Castanet product worldwide
through a combination of a direct sales force, resellers and distributors.
 
                            ------------------------
 
     We were incorporated in Delaware in February 1996. Our principal executive
offices are located at 440 Clyde Avenue, Mountain View, California 94043, and
our telephone number is (650) 930-5282.
 
     Marimba(R) and Castanet(R) are our trademarks. This prospectus also
contains trademarks of other companies.
                                        3
<PAGE>   4
 
                                  THE OFFERING
 
<TABLE>
<S>                                               <C>
Common stock offered by us......................  3,548,000 shares
Common stock offered by the selling
  stockholders..................................  452,000 shares
Common stock to be outstanding after the
  offering......................................  22,745,775 shares(1)
Over-allotment option...........................  600,000 shares
Use of proceeds.................................  Working capital and general corporate purposes.
                                                  See "Use of Proceeds."
Dividend policy.................................  Currently, we do not anticipate paying cash
                                                  dividends.
Nasdaq National Market symbol...................  MRBA
</TABLE>
 
- -------------------------
(1) Based on the number of shares outstanding as of March 31, 1999. Excludes
    1,959,930 shares of common stock issuable upon exercise of outstanding
    options and warrants as of March 31, 1999 at a weighted average exercise
    price of $4.099. Between March 31, 1999 and April 19, 1999, we granted
    options to purchase 1,047,000 shares of our common stock at an exercise
    price of $15.00 per share. In connection with the options to purchase
    1,047,000 shares of Common Stock, we will record deferred compensation of
    $2.1 million, which will be in addition to the $1.1 million of unamortized
    deferred compensation at December 31, 1998. This deferred compensation will
    be amortized over the vesting periods of the options on a graded vesting
    method.
 
                      SUMMARY CONSOLIDATED FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                 PERIOD FROM           YEAR ENDED
                                                              FEBRUARY 21, 1996       DECEMBER 31,
                                                               (INCEPTION) TO      ------------------
                                                              DECEMBER 31, 1996     1997       1998
                                                              -----------------    -------    -------
<S>                                                           <C>                  <C>        <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues....................................................       $    --         $ 5,563    $17,085
Loss from operations........................................        (1,310)         (7,902)    (6,128)
Net loss....................................................        (1,245)         (7,718)    (5,681)
Basic and diluted net loss per share........................       $  (.81)        $ (1.57)   $  (.59)
Weighted-average shares of common stock outstanding used in
  computing basic and diluted net loss per share............         1,528           4,912      9,606
Pro forma basic and diluted net loss per share
  (unaudited)...............................................                                  $  (.37)
Shares used in computing pro forma basic and diluted net
  loss per common share (unaudited).........................                                   15,359
</TABLE>
 
<TABLE>
<CAPTION>
                                                                  DECEMBER 31, 1998
                                                              --------------------------
                                                               ACTUAL     AS ADJUSTED(1)
                                                              --------    --------------
                                                                           (UNAUDITED)
<S>                                                           <C>         <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash, cash equivalents and short-term investments...........  $  7,825       $ 71,907
Working capital.............................................     2,912         67,153
Total assets................................................    14,862         78,944
Long-term portion of capital lease obligations and equipment
  advances, and other long-term liabilities.................       747             95
Redeemable convertible preferred stock......................    18,953             --
Stockholders' equity (net capital deficiency)...............   (13,743)        70,103
</TABLE>
 
- -------------------------
(1) Adjusted to reflect our sale of 3,548,000 shares of common stock in this
    offering, at an initial public offering price of $20.00 per share and after
    deducting estimated underwriting discounts and commissions and offering
    expenses payable by us and the application of our net proceeds from this
    offering.
                                        4
<PAGE>   5
 
                              RECENT DEVELOPMENTS
 
     Based on our preliminary analysis, revenues increased by $470,000, or 8%,
from $5.7 million in the fourth quarter of 1998 to $6.1 million in the first
quarter of 1999. Total revenues during the first quarter of 1999 were comprised
of $4.5 million from license revenues and $1.6 million from service revenues.
Increased revenues during the first quarter resulted from sales to new and
existing customers. In March 1999, Marimba released version 4.0 of its Castanet
products and had initial sales of this product.
 
     Our net loss remained relatively constant at $1.6 million for both the
fourth quarter of 1998 and the first quarter of 1999. Higher revenues in the
first quarter of 1999 were offset by higher operating expenses. We increased
operating expenses as we continued to expand our organization in all operating
areas.
 
     Basic and diluted net loss per share during the first quarter of 1999 was
$0.13 compared to $0.14 during the fourth quarter of 1998. The decrease in basic
and diluted net loss per share was due to an increase in the number of shares of
common stock outstanding that resulted from stock option exercises by employees.
 
     We believe that the unaudited financial information for the first quarter
of 1999 contains all adjustments needed to present fairly the information
discussed above, and that the adjustments made consist only of normal recurring
adjustments.
                                        5
<PAGE>   6
 
                                  RISK FACTORS
 
     This offering and an investment in our common stock involve a high degree
of risk. You should carefully consider the following risk factors and the other
information in this prospectus before investing in our common stock. Our
business and results of operations could be seriously harmed by any of the
following risks. The trading price of our common stock could decline due to any
of these risks, and you may lose all or part of your investment.
 
RISKS RELATED TO OUR BUSINESS
 
     OUR LIMITED OPERATING HISTORY MAY PREVENT US FROM ACHIEVING SUCCESS IN OUR
BUSINESS
 
     We were founded in February 1996 and have a limited operating history. We
began offering our Castanet product in January 1997 and released Castanet 4.0 in
March 1999. As a result, we have a limited operating history that may prevent us
from achieving success in our business. The revenues and income potential of our
business and market are unproven. We will encounter challenges and difficulties
frequently encountered by early-stage companies in new and rapidly evolving
markets. We may not successfully address any of these challenges and the failure
to do so would seriously harm our business and operating results. In addition,
because of our limited operating history, we have limited insight into trends
that may emerge and affect our business.
 
     WE HAVE INCURRED LOSSES AND WE EXPECT FUTURE LOSSES
 
     Our failure to significantly increase our revenues would seriously harm our
business and operating results. We have experienced operating losses in each
quarterly and annual period since inception and we expect to incur significant
losses in the future. We incurred net losses of $1.2 million for the period
ended December 31, 1996, $7.7 million for the year ended December 31, 1997 and
$5.7 million for the year ended December 31, 1998. As of December 31, 1998, we
had an accumulated deficit of $14.6 million. We expect to significantly increase
our research and development, sales and marketing and general and administrative
expenses. As a result, we will need to significantly increase our quarterly
revenues to achieve and maintain profitability. We may not be able to sustain
our recent revenue growth rates. In fact, we may not have any revenue growth,
and our revenues could decline. For a more detailed description of our operating
results, please see "Selected Consolidated Financial Data" and "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
 
     OUR QUARTERLY OPERATING RESULTS ARE VOLATILE AND FUTURE OPERATING RESULTS
REMAIN UNCERTAIN
 
     Our quarterly operating results have varied significantly in the past and
will likely vary significantly in the future. As a result, we believe that
period-to-period comparisons of our operating results are not meaningful and
should not be relied upon as indicators of our future performance. In the
future, our operating results will likely be below the expectations of
securities analysts and investors. Our failure to meet these expectations would
likely seriously harm the market price of our common stock. Operating results
vary depending on a number of factors, many of which are outside our control.
 
     In addition, we anticipate that the size of customer orders may increase as
we focus on larger business accounts. As a result, a delay in recognizing
revenue, even from just one account, could have a significant negative impact on
our operating results. In the past, a significant portion of our sales have been
realized near the end of a quarter. As a result, a delay in an anticipated sale
past the end of a particular quarter could negatively impact our operating
results.
 
     We expect that revenues in the first quarter of each year will be lower
than revenues in the fourth quarter of the preceding year. We believe this trend
will be primarily due to the annual nature of budgetary, purchasing and sales
cycles.
 
     Our expense levels are relatively fixed and are based, in part, on
expectations as to future revenues. As a result, if revenue levels fall below
our expectations, our net loss will increase because only a small
 
                                        6
<PAGE>   7
 
portion of our expenses vary with our revenues. For a more detailed description
of our quarterly results, please see "Management's Discussion and Analysis of
Financial Condition and Results of Operations."
 
     WE EXPECT SIGNIFICANT INCREASES IN OUR OPERATING EXPENSES
 
     We intend to substantially increase our operating expenses as we:
 
     - Increase our sales and marketing activities, including expanding our
       direct sales force;
 
     - Increase our research and development activities;
 
     - Expand our customer support and professional services organizations; and
 
     - Expand our distribution channels.
 
     With these additional expenses, we must significantly increase our revenues
in order to become profitable. These expenses will be incurred before we
generate any revenues by this increased spending. If we do not significantly
increase revenues from these efforts, our business and operating results would
be seriously harmed.
 
     OUR SUCCESS DEPENDS ON OUR CASTANET PRODUCT FAMILY AND NEW PRODUCT
DEVELOPMENT
 
     We expect to continue to derive substantially all of our revenues from our
Castanet software product family and related services. A decline in the price of
Castanet or our inability to increase sales of Castanet would seriously harm our
business and operating results. We cannot predict Castanet's success. In March
1999 we introduced Castanet 4.0, which is designed to provide customers with
additional functionality. Castanet 4.0 may not provide the benefits we expect,
and Castanet 4.0 could fail to meet customers' requirements or achieve
widespread market acceptance.
 
     Our strategy requires Castanet to be highly scalable -- in other words,
able to rapidly increase deployment size from a limited number of end-users to a
very large number of end-users. If we are unable to achieve this level of
scalability, the attractiveness of our products and services would be
diminished.
 
     WE NEED TO DEVELOP AND INTRODUCE NEW TECHNOLOGIES
 
     To provide a comprehensive Internet services management solution, we will
need to develop and introduce new products which offer functionality that we do
not currently provide. We may not be able to develop these technologies and
therefore we may not be able to offer a comprehensive Internet services
management solution. In addition, in the past we have experienced delays in new
product releases, and we may experience similar delays in the future. If we fail
to deploy new product releases on a timely basis, our business and operating
results could be seriously harmed.
 
     WE DEPEND ON THE GROWTH OF OUR CUSTOMER BASE
 
     Our success is substantially dependent on the continued growth of our
customer base. If we fail to increase our customer base, our business and
operating results would be seriously harmed. Our ability to attract new
customers will depend on a variety of factors, including the reliability,
security, scalability and cost-effectiveness of our products and services as
well as our ability to effectively market our products and services. In the
past, we have lost potential customers to competitors for various reasons,
including lower prices.
 
     WE DEPEND ON INCREASED BUSINESS FROM OUR CURRENT CUSTOMERS
 
     If we fail to generate repeat and expanded business from our current
customers, our business and operating results would be seriously harmed. Most of
our customers initially make a limited purchase of our products and services for
pilot programs. Many of these customers may not choose to purchase additional
licenses to expand their use of Castanet. In addition, as we deploy new versions
of Castanet or introduce new products, our current customers may not require the
functionality of our new products and may not ultimately license these products.
 
                                        7
<PAGE>   8
 
     Because the total amount of maintenance and support fees we receive in any
period depends in large part on the size and number of licenses that we have
previously sold, any downturn in our software license revenues would negatively
impact our future service revenues. In addition, if customers elect not to renew
their maintenance agreements, our service revenues could be significantly
adversely affected.
 
     WE HAVE A LONG SALES CYCLE THAT DEPENDS UPON FACTORS OUTSIDE OUR CONTROL
 
     A customer's decision to purchase Castanet typically involves a significant
commitment of resources and is influenced by the customer's budget cycles. In
addition, selling Castanet requires us to educate potential customers on its use
and benefits. As a result, our products have a long sales cycle which can take
over six months. We face difficulty predicting the quarter in which sales to
expected customers may occur. The sale of our products is also subject to delays
from the lengthy budgeting, approval and competitive evaluation processes that
typically accompany significant capital expenditures. For example, customers
frequently begin by evaluating our products on a limited basis and devote time
and resources to testing our products before they decide whether or not to
purchase a license for deployment. Customers may also defer orders as a result
of anticipated releases of new products or enhancements by us or our
competitors.
 
     WE DEPEND ON OUR RELATIONSHIP WITH TIVOLI
 
     Tivoli, a subsidiary of International Business Machines Corporation, has
been a primary reseller of our products since 1997. Because a significant amount
of our revenues has been and is expected to be derived from Tivoli, we are
dependent on our relationship with Tivoli. Any disruption of our relationship
with Tivoli would seriously harm our business and operating results.
 
     In March 1998, we entered into an original equipment manufacturer agreement
with Tivoli under which Tivoli is building upon the Castanet infrastructure to
develop a product called Cross-Site. Tivoli released Cross-Site in April 1999.
We expect to generate revenues from royalties on sales of Cross-Site beginning
in 1999 and expect that revenues from Tivoli's resale of Castanet will rapidly
decrease and become insignificant as Tivoli transitions its efforts to the sale
of Cross-Site. Our reseller agreement with Tivoli expires upon the earlier of
June 30, 1999 or written notice provided to us by Tivoli. The change in our
relationship with Tivoli from a reseller relationship to an original equipment
manufacturer relationship will require significantly increased ongoing
technological assistance to, and collaboration with Tivoli to support the
integration of Castanet into Cross-Site. This collaboration may be unsuccessful.
 
     Tivoli might fail to successfully market and sell Cross-Site. Any failure
of Cross-Site to achieve widespread market acceptance could significantly harm
our business and operating results. Because Cross-Site is built upon the
Castanet infrastructure, we expect Cross-Site to compete with our Castanet
products. For a description of Tivoli's financial impact on our business, see
"Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
     NOVADIGM HAS CLAIMED THAT WE INFRINGE ITS INTELLECTUAL PROPERTY
 
     On March 3, 1997, Novadigm filed a complaint against us in the United
States District Court for the Northern District of California, alleging
infringement by us of a patent held by Novadigm (U.S. Patent No. 5,581,764, the
"Novadigm Patent"). Novadigm alleges that our infringement relates to methods
for updating data and software over a computer network that we use in our
Castanet products. The complaint also alleges that we have willfully infringed
the Novadigm Patent and seeks up to triple damages under the United States
Patent Act. On May 2, 1997, we filed our answer to Novadigm's complaint and
filed a counterclaim against Novadigm.
 
     Litigation is subject to inherent uncertainties. In addition, cases like
this generally involve issues of law that are evolving, presenting further
uncertainty. Our defense of this litigation, regardless of the merits of the
complaint, has been, and will likely continue to be, time-consuming and a
diversion for our
 
                                        8
<PAGE>   9
 
personnel. In addition, publicity related to this litigation has in the past,
and will likely in the future, have a negative impact on the sale of our
Castanet products.
 
     A failure to prevail in the litigation could result in:
 
     - Our paying monetary damages, which could be tripled if the infringement
       is found to have been willful;
 
     - The issuance of a preliminary or permanent injunction requiring us to
       stop selling Castanet in its current form;
 
     - Our having to redesign Castanet, which could be costly and time-consuming
       and could substantially delay Castanet shipments, assuming that a
       redesign is feasible;
 
     - Our having to reimburse Novadigm for some or all of its attorneys' fees;
 
     - Our having to obtain from Novadigm a license to its patent, which license
       might not be made available to us on reasonable terms, particularly
       because Novadigm is a competitor; or
 
     - Our having to indemnify our customers against any losses they may incur
       due to the alleged infringement.
 
     Any of these results would seriously harm our business and operating
results. Furthermore, we expect to continue to incur substantial costs in
defending against this litigation and these costs could increase significantly
if our dispute goes to trial. It is possible that these costs could
substantially exceed our expectations in future periods. For a more detailed
description of this litigation please see "Business -- Legal Proceedings."
 
     OUR MARKETS ARE HIGHLY COMPETITIVE
 
     Our markets are new, rapidly evolving and highly competitive, and we expect
this competition to persist and intensify in the future. Our failure to maintain
and enhance our competitive position could seriously harm our business and
operating results. We encounter current or potential competition from a number
of sources, including:
 
     - Sellers of enterprise-wide management systems, which include electronic
       software distribution;
 
     - Companies that market products that support the distribution of software
       applications; and
 
     - Desktop software management suites.
 
     In addition, we compete with various methods of application distribution
and management, including the web browser, and with application server vendors
and others that have introduced software distribution capabilities into their
products.
 
     Potential competitors may bundle their products or incorporate an Internet
services management component into existing products in a manner that
discourages users from purchasing our products. For example, we expect that
future releases of Microsoft's Windows operating systems, which manage the
programs on a computer, will include components addressing Internet services
management functions. Furthermore, new competitors or alliances among
competitors may emerge and rapidly acquire significant market share. Our
competitors may be able to respond more quickly to new or emerging technologies
and changes in customer requirements than we can.
 
     Some of our competitors have longer operating histories and significantly
greater financial, technical, marketing and other resources than we do. Many of
these companies have more extensive customer bases and broader customer
relationships that they could leverage, including relationships with many of our
current and potential customers. These companies also have significantly more
established customer support and professional services organizations than we do.
In addition, these companies may adopt aggressive pricing policies. For a more
detailed description of our competitive position, including some of our
competitors and competitive products, please see "Business -- Competition."
 
                                        9
<PAGE>   10
 
     PROTECTION OF OUR INTELLECTUAL PROPERTY IS LIMITED
 
     We rely on a combination of patent, trademark, trade secret and copyright
law and contractual restrictions to protect the proprietary aspects of our
technology. These legal protections afford only limited protection. Despite our
efforts to protect our proprietary rights, unauthorized parties may attempt to
copy aspects of our products or to obtain and use our proprietary information.
Litigation may be necessary to enforce our intellectual property rights, to
protect our trade secrets and to determine the validity and scope of the
proprietary rights of others. Any litigation could result in substantial costs
and diversion of resources and could seriously harm our business and operating
results. In addition, we sell our products internationally, and the laws of many
countries do not protect our proprietary rights as well as the laws of the
United States.
 
     WE MAY BE FOUND TO INFRINGE PROPRIETARY RIGHTS OF OTHERS
 
     Other companies, including our competitors, may obtain patents or other
proprietary rights that would prevent, or limit or interfere with our ability to
make, use or sell our products. As a result, we may be found to infringe on the
proprietary rights of others. Furthermore, companies in the software market are
increasingly bringing suits alleging infringement of their proprietary rights,
particularly patent rights. We could incur substantial costs to defend any
litigation, and intellectual property litigation could force us to do one or
more of the following:
 
     - Cease selling, incorporating or using products or services that
       incorporate the challenged intellectual property;
 
     - Obtain a license from the holder of the infringed intellectual property
       right; and
 
     - Redesign products or services.
 
     In the event of a successful claim of infringement against us and our
failure or inability to license the infringed technology, our business and
operating results would be significantly harmed. For a description of our
current litigation with Novadigm, Inc., please see "Business -- Legal
Proceedings."
 
     WE DEPEND UPON THIRD-PARTY DISTRIBUTION RELATIONSHIPS AND NEED TO DEVELOP
NEW RELATIONSHIPS
 
     We have a limited number of distribution agreements and we may not be able
to increase our number of distribution relationships or maintain our existing
relationships. For example, Netscape, a reseller of our products, accounted for
a significant amount of our revenues in 1997 and 1998. Netscape is no longer an
active reseller of our products, and we do not expect material revenues from
Netscape in the future.
 
     Our current agreements with our channel partners do not prevent these
companies from selling products of other companies, including products that may
compete with our products, and do not generally require these companies to
purchase minimum quantities of our products. These distributors could give
higher priority to the products of other companies or to their own products,
than they give to our products. In addition, sales through these channels
generally have a lower price than direct sales. As a result, while the loss of,
or significant reduction in sales volume to any of our current or future
distribution partners could seriously harm our revenues and operating results, a
significant increase in sales through these channels could also negatively
impact our gross margins. For additional information regarding our third-party
distribution relationships please see "Business -- Sales, Marketing and
Distribution."
 
     WE NEED TO DEVELOP AND EXPAND OUR SALES, MARKETING AND DISTRIBUTION
CAPABILITIES
 
     We need to expand our marketing and direct sales operations in order to
increase market awareness of our products, market Castanet to a greater number
of enterprises and generate increased revenues. However, competition for
qualified sales personnel is intense and we may not be able to hire enough
qualified individuals in the future. Our products and services require a
sophisticated sales effort targeted at senior management of our prospective
customers. New hires require extensive training and typically
                                       10
<PAGE>   11
 
take at least six months to achieve full productivity. In addition, we have
limited experience marketing our products broadly to a large number of potential
customers. For additional information regarding our direct sales operations
please see "Business -- Sales, Marketing and Distribution."
 
     WE NEED TO EXPAND OUR PROFESSIONAL SERVICES
 
     We may not be able to attract, train or retain the number of highly
qualified services personnel that our business needs. We believe that growth in
our product sales depends on our ability to provide our customers with
professional services and to educate third-party resellers and consultants on
how to provide similar services. As a result, we plan to increase the number of
our services personnel to meet these needs. However, competition for qualified
services personnel is intense. For additional information regarding our
professional services please see "Business -- Customer Support and Training."
 
     We expect our service revenues to increase in dollar amount as we continue
to provide support, consulting and training services that complement our
products and as our installed base of customers grows. This could negatively
impact our gross margin because margins on revenues derived from services are
generally lower than margins on revenues derived from the license of Castanet.
 
     EXPANDING INTERNATIONALLY IS EXPENSIVE, WE MAY RECEIVE NO BENEFIT FROM OUR
EXPANSION AND OUR INTERNATIONAL OPERATIONS ARE SUBJECT TO GOVERNMENTAL
REGULATION
 
     We plan to increase our international sales force and operations. However,
we may not be successful in increasing our international sales. In addition, our
international business activities are subject to a variety of risks, including
the adoption of laws, currency fluctuations, actions by third parties and
political and economic conditions that could restrict or eliminate our ability
to do business in foreign jurisdictions. To date, we have not adopted a hedging
program to protect us from risks associated with foreign currency fluctuations.
For additional information on our foreign currency risks, please see
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Qualitative and Quantitative Disclosure about Market Risk."
 
     Export, and in some cases, import clearances must be obtained before
Castanet can be distributed internationally. Current or new government laws and
regulations, or the application of existing laws and regulations, could expose
us to significant liabilities, significantly slow our growth and seriously harm
our business and operating results.
 
     WE MUST MANAGE OUR GROWTH AND EXPANSION
 
     Our historical growth has placed, and any further growth is likely to
continue to place, a significant strain on our resources. Any failure to manage
growth effectively could seriously harm our business and operating results. We
have grown from 20 employees at December 31, 1996 to 145 employees at December
31, 1998. We have also opened seven sales offices and have significantly
expanded our operations. To be successful, we will need to implement additional
management information systems, improve our operating, administrative, financial
and accounting systems and controls, train new employees and maintain close
coordination among our executive, engineering, accounting, finance, marketing,
sales and operations organizations. In addition, our growth has resulted, and
any future growth will result, in increased responsibilities for management
personnel.
 
     WE MUST RETAIN AND ATTRACT KEY PERSONNEL
 
     Our success depends largely on the skills, experience and performance of
the members of our senior management and other key personnel, including our
President and Chief Executive Officer, Kim Polese, our Executive Vice President,
Worldwide Sales and Chief Operating Officer, Steven P. Williams and our Chief
Technical Officer, Arthur van Hoff. We may not be successful in attracting,
assimilating or retaining qualified personnel in the future. None of our senior
management or other key personnel is bound by an employment agreement. If we
lose one or more of these key employees, our business and operating results
could be seriously harmed. In addition, our future success will depend largely
on our
 
                                       11
<PAGE>   12
 
ability to continue attracting and retaining highly skilled personnel. Like
other companies in the San Francisco Bay Area, we face intense competition for
qualified personnel. For a more detailed description of our management
personnel, please see "Management."
 
     WE RELY ON THIRD-PARTY SOFTWARE AND APPLICATIONS
 
     We integrate third-party security and encryption software and digital
certificates as a component of our software. There are inherent limitations in
the use and capabilities of much of the technology that we license from third
parties. As a result, we face a number of challenges in integrating these
technologies into Castanet. We would be seriously harmed if the providers from
whom we license software ceased to deliver and support reliable products,
enhance their current products or respond to emerging industry standards. In
addition, the third-party software may not continue to be available to us on
commercially reasonable terms or at all. The loss of, or inability to maintain
or obtain this software, could result in shipment delays or reductions.
Furthermore, we might be forced to limit the features available in our current
or future product offerings. Either alternative could seriously harm our
business and operating results.
 
     Almost all of our products are written in Java and require a Java virtual
machine made available by Sun Microsystems, Inc. in order to operate. Sun may
not continue to make these implementations of the Java virtual machines
available at commercially reasonable terms or at all. Furthermore, if Sun were
to make significant changes to the Java language or its Java virtual machine
implementations, or fail to correct defects and limitations in these products,
our ability to continue to improve and ship our products could be impaired. In
the future, our customers may also require the ability to deploy our products on
platforms for which technically acceptable Java implementations either do not
exist or are not available on commercially reasonable terms. Our customers may
also use particular implementations of the Java virtual machine that may not be
technically or commercially acceptable for integration into our products.
 
     SOFTWARE DEFECTS IN CASTANET WOULD HARM OUR BUSINESS
 
     Complex software products like ours often contain errors or defects,
including errors relating to security, particularly when first introduced or
when new versions or enhancements are released. Castanet extensively utilizes
digital certificates and other complex technology. Our use of this technology
has in the past and may in the future result in product behavior problems which
may not be anticipated by us or our customers. For example, most versions of
Castanet shipped before Castanet 4.0 contain digital certificates that cause
Castanet and any applications being delivered with Castanet to stop running when
the certificate used expires. We have developed an update which avoids this
problem and are in the process of notifying customers of the issue and
distributing the update. It is possible that we may not be able to identify all
affected customers and provide them with the update. Customers that do not
install the update will experience this problem with respect to Castanet itself
on June 24, 1999, and, with respect to any applications they have deployed with
Castanet and signed with a certificate, on the date of expiration of the
certificate they elected to use. Defects or errors in current or future
products, including Castanet 4.0, could result in lost revenues or a delay in
market acceptance, which would seriously harm our business and operating results
operations.
 
     Since many of our customers use our products for business-critical
applications, errors, defects or other performance problems could result in
financial or other damage to our customers and could significantly impair their
operations. Our customers could seek damages for losses related to any of these
issues.For example, we could be subject to claims for losses by customers that
we are unable to identify and notify and, as a result, do not install our update
that avoids the digital certificate problem. A product liability claim brought
against us, even if not successful, would likely be time consuming and costly to
defend and could adversely affect our marketing efforts.
 
                                       12
<PAGE>   13
 
     YEAR 2000 ISSUES COULD AFFECT OUR BUSINESS
 
     We are in the process of assessing any Year 2000 issues with the computer
communications, software and security systems that we use to deliver and manage
our products and to manage our internal operations. If our systems do not
operate properly with respect to date calculations involving the Year 2000 and
subsequent dates, we could incur unanticipated expenses to remedy any problems,
which could seriously harm our business. We may also experience reduced sales of
our products as current or potential customers reduce their budgets for Internet
services management products due to increased expenditures on their own Year
2000 compliance efforts.
 
     We have identified one Year 2000 date-related limitation in earlier
versions of Castanet. Versions of Castanet before 3.2 display date-related data
to the user in a manner that uses only two digits to represent a year. A
two-digit display of the Year 2000 could cause a user to believe the year
represented was 1900 instead of 2000. Despite our testing and correcting, our
products, including Castanet 4.0, may contain errors or faults with respect to
the Year 2000. Our efforts to address Year 2000 issues are described in more
detail in "Management's Discussion and Analysis of Financial Condition and
Results of Operations -- Year 2000 Compliance."
 
     OUR FUTURE CAPITAL NEEDS ARE UNCERTAIN
 
     We expect the net proceeds from this offering and borrowings under our
credit facility to be sufficient to meet our working capital and capital
expenditure needs for at least twelve months. After that, we may need to raise
additional funds, and additional financing may not be available on favorable
terms, if at all. This could seriously harm our business and operating results.
Furthermore, if we issue additional equity securities, stockholders may
experience dilution, and the new equity securities could have rights senior to
those of existing holders of our common stock. If we cannot raise funds, if
needed, on acceptable terms, we may not be able to develop or enhance our
products, take advantage of future opportunities or respond to competitive
pressures or unanticipated requirements. For a discussion regarding our use of
proceeds from this offering, dilution or our working capital, please see "Use of
Proceeds," "Dilution" and "Management's Discussion and Analysis of Financial
Condition and Results of Operations -- Liquidity and Capital Resources."
 
     WE ARE CONTROLLED BY EXISTING STOCKHOLDERS
 
     On completion of this offering, executive officers and directors and their
affiliates will beneficially own, in the aggregate, approximately 40.8% of our
outstanding common stock. As a result, these stockholders will be able to
exercise significant control over all matters requiring stockholder approval,
including the election of directors and approval of significant corporate
transactions, which could have the effect of delaying or preventing a third
party from acquiring control over us. We plan to reserve up to 6.5% of the
shares offered in this offering under a directed share program for selected
directors, suppliers, customers and others who have a relationship with us under
which these persons would be able to purchase shares in this offering at the
initial public offering price. For information regarding the ownership of our
outstanding stock by our executive officers and directors and their affiliates,
please see "Principal and Selling Stockholders."
 
     WE HAVE IMPLEMENTED ANTI-TAKEOVER PROVISIONS
 
     Provisions of our certificate of incorporation and bylaws, as well as
provisions of Delaware law, could make it more difficult for a third party to
acquire us, even if doing so would be beneficial to our stockholders. For
information regarding these provisions, please see "Description of Capital
Stock."
 
RISKS RELATED TO OUR INDUSTRY
 
     WE FACE CHALLENGES STEMMING FROM OUR EMERGING MARKETS
 
     The market for Internet services management software has only recently
begun to develop, is rapidly evolving and will likely have an increasing number
of competitors. We cannot be certain that a viable
 
                                       13
<PAGE>   14
 
market for our products will emerge or be sustainable. If the Internet services
management market fails to develop, or develops more slowly than expected, our
business and operating results would be seriously harmed.
 
     Furthermore, in order to be successful in this emerging market, we must be
able to differentiate ourself from our competitors through our product and
service offerings and brand name recognition. We may not be successful in
differentiating ourself or achieving widespread market acceptance of our
products and services. Furthermore, enterprises that have already invested
substantial resources in other methods of deploying and managing their
applications and services may be reluctant or slow to adopt a new approach that
may replace, limit or compete with their existing systems.
 
     WE DEPEND ON CONTINUED USE OF THE INTERNET AND GROWTH OF ELECTRONIC
BUSINESS
 
     Rapid growth in the use of and interest in the Internet has occurred only
recently. As a result, acceptance and use may not continue to develop at
historical rates, and a sufficiently broad base of consumers may not adopt, and
continue to use, the Internet and other online services as a medium of commerce.
Demand and market acceptance for recently introduced services and products over
the Internet are subject to a high level of uncertainty, and there exist few
proven services and products.
 
     In addition, the Internet may not be accepted as a long-term commercial
marketplace for a number of reasons, including potentially inadequate
development of the necessary network infrastructure or delayed development of
enabling technologies and performance improvements. Our success will depend, in
large part, upon third parties maintaining the Internet infrastructure to
provide a reliable network backbone with the necessary speed, data capacity,
security and hardware necessary for reliable Internet access and services.
 
     WE MUST RESPOND TO RAPID TECHNOLOGICAL CHANGE AND EVOLVING INDUSTRY
STANDARDS
 
     The markets for our Internet services management solutions are marked by
rapid technological change, frequent new product introductions and enhancements,
uncertain product life cycles, changes in customer demands and evolving industry
standards. New products based on new technologies or new industry standards can
quickly render existing products obsolete and unmarketable. Any delays in our
ability to develop and release enhanced or new products could seriously harm our
business and operating results. Our technology is complex, and new products and
product enhancements can require long development and testing periods. Our
failure to conform to prevailing standards could have a negative effect on our
business and operating results.
 
RISKS RELATED TO THIS OFFERING
 
     NO PUBLIC MARKET FOR OUR COMMON STOCK CURRENTLY EXISTS AND OUR STOCK PRICE
MAY FLUCTUATE AFTER THIS OFFERING
 
     An active public market for our common stock may not develop or be
sustained after this offering. The market price for our common stock will vary
from the initial offering price after this offering. The market price of our
common stock may fluctuate significantly in response to a number of factors,
some of which are beyond our control, including:
 
     - Quarterly variations in operating results;
 
     - Changes in financial estimates by securities analysts;
 
     - Announcements by us or our competitors of new products, significant
       contracts, acquisitions or strategic relationships;
 
     - Additions or departures of key personnel;
 
     - Any future sales of our common stock or other securities; and
 
     - Stock market price and volume fluctuations, which are particularly common
       among securities of Internet-related companies.
 
                                       14
<PAGE>   15
 
     FUTURE SALES OF SHARES COULD AFFECT OUR STOCK PRICE
 
     If our stockholders sell substantial amounts of our common stock in the
public market following this offering, the market price of our common stock
could fall. Based on shares outstanding as of March 31, 1999, upon completion of
this offering, we will have outstanding 22,745,775 shares of common stock. Other
than the shares of common stock sold in this offering, no shares will be
eligible for sale in the public market immediately. Our stockholders will be
subject to agreements with the underwriters or us that restrict their ability to
transfer their stock for 180 days from the date of this prospectus. After these
agreements expire, an additional 18,745,775 shares will be eligible for sale in
the public market. For a detailed discussion of the shares eligible for future
sale, please see "Shares Eligible for Future Sale."
 
     NEW STOCKHOLDERS WILL INCUR SUBSTANTIAL DILUTION AS A RESULT OF THIS
OFFERING
 
     The initial public offering price is substantially higher than the book
value per share of our outstanding common stock. As a result, investors
purchasing common stock in this offering will incur immediate substantial
dilution. In addition, we have issued options to acquire common stock at prices
significantly below the initial public offering price. To the extent outstanding
options are ultimately exercised, there will be further dilution to investors in
this offering. For a discussion regarding dilution in this offering, please see
"Dilution."
 
     WE HAVE BROAD DISCRETION TO USE THE PROCEEDS FROM THIS OFFERING
 
     We plan to use the proceeds from this offering for general corporate
purposes. Therefore, we will have broad discretion as to how we will spend the
proceeds, and stockholders may not agree with the ways in which we use the
proceeds. We may not be successful in investing the proceeds from this offering,
in our operations or external investments, to yield a favorable return.
 
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
 
     This prospectus contains forward-looking statements. These statements
relate to future events or our future financial performance. In some cases, you
can identify forward-looking statements by terminology; for instance, may, will,
should, expect, plan, anticipate, believe, estimate, predict, potential or
continue, the negative of these terms or other comparable terminology. These
statements are only predictions. Actual events or results may differ materially.
In evaluating these statements, you should specifically consider various
factors, including the risks outlined in the Risk Factors section. These factors
may cause our actual results to differ materially from any forward-looking
statement.
 
     Although we believe that the expectations reflected in the forward-looking
statements are reasonable, we cannot guarantee future results, levels of
activity, performance or achievements. Moreover, neither we nor any other person
assumes responsibility for the accuracy and completeness of the forward-looking
statements. We are under no duty to update any of the forward-looking statements
after the date of this prospectus to conform these statements to actual results
or to changes in our expectations.
 
                                       15
<PAGE>   16
 
                                USE OF PROCEEDS
 
     Our net proceeds from the sale of the 3,548,000 shares of common stock we
are offering are estimated to be $64.9 million, after deducting underwriting
discounts and commissions and estimated offering expenses. If the underwriters'
over-allotment option is exercised in full, we estimate that our net proceeds
will be approximately $68.4 million. We will not receive any of the proceeds
from the sale of shares of common stock by the selling stockholders. We expect
to use $811,000 of the net proceeds to repay equipment advances outstanding
under a credit facility that currently bears interest at 7.75% per year and to
use the balance for general corporate purposes, including working capital. A
portion of the net proceeds may also be used for the acquisition of businesses,
products and technologies that are complementary to ours. We have no current
plans, agreements or commitments for acquisitions and are not currently engaged
in any negotiations for any acquisition. Pending these uses, we will invest the
net proceeds of this offering in short-term, investment grade, interest-bearing
securities.
 
                                DIVIDEND POLICY
 
     We have not paid any cash dividends since inception and do not currently
intend to pay any cash dividends. In addition, the terms of our credit agreement
prohibit the payment of dividends on our capital stock.
 
                                       16
<PAGE>   17
 
                                 CAPITALIZATION
 
     The following table presents our capitalization as of December 31, 1998 (1)
on an actual basis (2) on a pro forma basis, after giving effect to the
conversion of all outstanding shares of preferred stock into common stock and
(3) as adjusted to reflect our receipt of the estimated net proceeds from our
sale of 3,548,000 shares of common stock in this offering, after deducting the
underwriting discounts and commissions and estimated offering expenses, the
filing of a new certificate of incorporation after the closing of this offering
and the application of our proceeds from this offering:
 
<TABLE>
<CAPTION>
                                                                       DECEMBER 31, 1998
                                                              ------------------------------------
                                                               ACTUAL     PRO FORMA    AS ADJUSTED
                                                              --------    ---------    -----------
                                                                         (IN THOUSANDS)
<S>                                                           <C>         <C>          <C>
Long-term liabilities, less current portion(1)..............  $    747    $    747      $     95
                                                              --------    --------      --------
Redeemable convertible preferred stock, $.0001 par value,
  15,000,000 shares authorized, 5,753,566 shares outstanding
  actual; 15,000,000 shares authorized, no shares
  outstanding pro forma; 10,000,000 shares authorized, no
  shares outstanding as adjusted............................    18,953          --            --
                                                              --------    --------      --------
Stockholders' equity (net capital deficiency):
  Common Stock, $.0001 par value, 30,000,000 shares
     authorized, 13,052,262 shares outstanding actual;
     30,000,000 shares authorized, 18,805,828 shares
     outstanding pro forma; 80,000,000 shares authorized,
     22,353,828 shares outstanding as adjusted(2)...........         1           2             2
  Additional paid-in capital................................     2,182      21,134        86,027
  Note receivable from officer..............................      (160)       (160)         (160)
  Deferred compensation.....................................    (1,116)     (1,116)       (1,116)
  Translation adjustment....................................        (6)         (6)           (6)
  Accumulated deficit.......................................   (14,644)    (14,644)      (14,644)
                                                              --------    --------      --------
     Total stockholders' equity (net capital deficiency)....   (13,743)      5,210        70,103
                                                              --------    --------      --------
          Total capitalization..............................  $  5,957    $  5,957      $ 70,198
                                                              ========    ========      ========
</TABLE>
 
- -------------------------
(1) See Notes 3 and 4 of Notes to Consolidated Financial Statements for a
    description of our capital leases and bank arrangements.
 
(2) The share numbers exclude:
 
   - 2,192,568 shares of common stock issuable upon exercise of stock options
     outstanding as of December 31, 1998 at a weighted average exercise price of
     $3.16 per share;
 
   - 1,229,773 shares of common stock available for issuance under our 1996
     Stock Plan;
 
   - 16,865 shares of common stock issuable upon the exercise of a warrant
     outstanding as of December 31, 1998 at an exercise price of $1.48 per
     share;
 
   - 1,250,000 shares of common stock available for issuance under our 1999
     Omnibus Equity Incentive Plan;
 
   - 500,000 shares of common stock available for issuance under our 1999
     employee stock purchase plan; and
 
   - 150,000 shares of common stock available for issuance under our 1999
     Non-Employee Directors Option Plan.
 
     Between December 31, 1998 and April 19, 1999, we issued options to purchase
1,260,500 shares of our common stock at exercise prices ranging from $10.00 per
share to $15.00 per share. In connection with options to purchase 1,047,000
shares of Common Stock issued on April 19, 1999 at an exercise price of $15.00
per share, we will record deferred compensation of $2.1 million, which will be
in addition to the $1.1 million of unamortized deferred compensation at December
31, 1998. The deferred compensation will be amortized over the vesting periods
of the options on a graded vesting method.
 
     See "Management -- Employee Benefit Plans," and Notes 6 and 9 of "Notes to
Consolidated Financial Statements" for a description of our equity plans.
 
                                       17
<PAGE>   18
 
                                    DILUTION
 
     Our pro forma net tangible book value as of December 31, 1998 was $5.2
million, or approximately $.28 per share. Net tangible book value per share
represents the amount of stockholders' equity, less intangible assets, divided
by 18,805,828 shares of common stock outstanding after giving effect to the
conversion of all outstanding shares of preferred stock into shares of common
stock upon completion of this offering.
 
     Net tangible book value dilution per share to new investors represents the
difference between the amount per share paid by purchasers of shares of common
stock in this offering and the net tangible book value per share of common stock
immediately after completion of this offering. After giving effect to our sale
of 3,548,000 shares of common stock in this offering and after deducting the
underwriting discounts and commissions and estimated offering expenses, our net
tangible book value as of December 31, 1998 would have been $70.1 million or
$3.14 per share. This represents an immediate increase in net tangible book
value of $2.86 per share to existing stockholders and an immediate dilution in
net tangible book value of $16.86 per share to purchasers of common stock in the
offering, as illustrated in the following table:
 
<TABLE>
<S>                                                           <C>      <C>
Initial public offering price per share.....................           $20.00
Pro forma net tangible book value per share as of December
  31, 1998..................................................  $ .28
Increase per share attributable to new investors............   2.86
                                                              -----
Pro forma net tangible book value per share after the
  offering..................................................             3.14
                                                                       ------
Dilution per share to new investors.........................           $16.86
                                                                       ======
</TABLE>
 
     The following table presents on a pro forma basis as of December 31, 1998,
after giving effect to the conversion of all outstanding shares of preferred
stock into common stock upon completion of this offering, the differences
between the existing stockholders and the purchasers of shares in the offering
with respect to the number of shares purchased from us, the total consideration
paid and the average price paid per share:
 
<TABLE>
<CAPTION>
                                                   SHARES PURCHASED       TOTAL CONSIDERATION      AVERAGE
                                                 --------------------    ---------------------      PRICE
                                                   NUMBER     PERCENT      AMOUNT      PERCENT    PER SHARE
                                                 ----------   -------    -----------   -------    ---------
<S>                                              <C>          <C>        <C>           <C>        <C>
Existing stockholders..........................  18,805,828     84.1%    $19,727,000     21.8%     $ 1.05
New stockholders...............................   3,548,000     15.9      70,960,000     78.2      $20.00
                                                 ----------    -----     -----------    -----
          Totals...............................  22,353,828    100.0%    $90,687,000    100.0%
                                                 ==========    =====     ===========    =====
</TABLE>
 
     The following table indicates the effect of sales by selling stockholders
on existing and new stockholders:
 
<TABLE>
<CAPTION>
                                                                                           SHARES HELD ASSUMING
                                       SHARES HELD BEFORE THE     SHARES HELD AFTER THE      EXERCISE OF OVER-
                                              OFFERING                  OFFERING             ALLOTMENT OPTION
                                       -----------------------    ---------------------    ---------------------
                                         NUMBER       PERCENT       NUMBER      PERCENT      NUMBER      PERCENT
                                       -----------    --------    ----------    -------    ----------    -------
<S>                                    <C>            <C>         <C>           <C>        <C>           <C>
Existing stockholders................  18,805,828      100.0%     18,353,828      82.1%    17,941,828      79.6%
New stockholders.....................          --         --       4,000,000      17.9      4,600,000      20.4
                                       ----------      -----      ----------     -----     ----------     -----
          Total......................  18,805,828      100.0%     22,353,828     100.0%    22,541,828     100.0%
                                       ==========      =====      ==========     =====     ==========     =====
</TABLE>
 
     For a description of the stock owned by the selling stockholders see
"Principal and Selling Stockholders."
 
     As of December 31, 1998, there were options outstanding to purchase a total
of 2,192,568 shares of common stock at a weighted average exercise price of
$3.16 per share. In addition, as of December 31, 1998, there was a warrant
outstanding to purchase 16,865 shares of common stock at an exercise price of
$1.48 per share. To the extent outstanding options or warrants are exercised,
there will be further dilution to new investors. For a description of our equity
plans, please see "Management -- Employee Benefit Plans" and Note 6 of Notes to
Consolidated Financial Statements.
 
                                       18
<PAGE>   19
 
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
     The following selected consolidated financial data should be read in
conjunction with our Consolidated Financial Statements and related notes and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" included elsewhere in this prospectus. The consolidated statement of
operations data for the inception period ended December 31, 1996 and the fiscal
years ended 1997 and 1998, and the consolidated balance sheet data at December
31, 1997 and 1998 are derived from audited consolidated financial statements
included elsewhere in this prospectus that have been audited by Ernst & Young
LLP, independent auditors. The consolidated balance sheet data at December 31,
1996 are derived from audited consolidated financial statements not included in
this prospectus. Historical results are not necessarily indicative of future
results. The pro forma consolidated balance sheet data as of December 31, 1998
is unaudited and reflects the assumed conversion of all outstanding shares of
preferred stock into common stock upon the consummation of this offering.
 
<TABLE>
<CAPTION>
                                                                 PERIOD FROM
                                                              FEBRUARY 21, 1996
                                                               (INCEPTION) TO      YEAR ENDED DECEMBER 31,
                                                                DECEMBER 31,       ------------------------
                                                                    1996              1997          1998
                                                              -----------------    ----------    ----------
                                                                  (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                           <C>                  <C>           <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues:
  License...................................................       $    --          $ 5,011       $13,901
  Service...................................................            --              552         3,184
                                                                   -------          -------       -------
          Total revenues....................................            --            5,563        17,085
Cost of revenues:
  License...................................................            --               13            75
  Service...................................................            --              621         1,964
                                                                   -------          -------       -------
          Total cost of revenues............................            --              634         2,039
                                                                   -------          -------       -------
Gross profit................................................            --            4,929        15,046
                                                                   -------          -------       -------
Operating expenses:
  Research and development..................................           515            2,410         5,773
  Sales and marketing.......................................           473            8,054        12,371
  General and administrative................................           322            2,367         2,779
  Amortization of deferred compensation.....................            --               --           251
                                                                   -------          -------       -------
          Total operating expenses..........................         1,310           12,831        21,174
                                                                   -------          -------       -------
Loss from operations........................................        (1,310)          (7,902)       (6,128)
Interest income, net........................................            65              338           488
                                                                   -------          -------       -------
Loss before income taxes....................................        (1,245)          (7,564)       (5,640)
Provision for income taxes..................................            --              154            41
                                                                   -------          -------       -------
Net loss....................................................       $(1,245)         $(7,718)      $(5,681)
                                                                   =======          =======       =======
Basic and diluted net loss per share........................       $  (.81)         $ (1.57)      $  (.59)
                                                                   =======          =======       =======
Weighted-average shares of common stock outstanding used in
  computing basic and diluted net loss per share............         1,528            4,912         9,606
                                                                   =======          =======       =======
Pro forma basic and diluted net loss per share
  (unaudited)...............................................                                      $  (.37)
                                                                                                  =======
Shares used in computing pro forma basic and diluted net
  loss per share (unaudited)................................                                       15,359
                                                                                                  =======
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                  PRO FORMA AS
                                                                    DECEMBER 31,                       OF
                                                       ---------------------------------------    DECEMBER 31,
                                                             1996            1997       1998          1998
                                                       -----------------    -------    -------    ------------
                                                                   (IN THOUSANDS)
<S>                                                    <C>                  <C>        <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
Cash, cash equivalents and short-term investments....       $ 2,811         $14,402    $ 7,825      $  7,825
Working capital......................................         2,464           8,036      2,912         2,912
Total assets.........................................         3,156          21,898     14,862        14,862
Long-term portion of capital lease obligations and
  equipment advances, and other long-term
  liabilities........................................            --             211        747           747
Redeemable convertible preferred stock...............         3,963          18,953     18,953            --
Accumulated deficit..................................        (1,245)         (8,963)   (14,644)      (14,644)
Total stockholders' equity (net capital
  deficiency)........................................        (1,235)         (8,471)   (13,743)        5,210
</TABLE>
 
                                       19
<PAGE>   20
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The following discussion should be read in conjunction with the
Consolidated Financial Statements and Notes appearing elsewhere in this
prospectus.
 
OVERVIEW
 
     Marimba is a leading provider of Internet-based software management
solutions that enable companies to expand their market reach, streamline
business processes and strengthen relationships with customers, business
partners and employees. Our Castanet product family provides an efficient and
reliable way for enterprises to distribute, update and manage applications and
related data over corporate intranets, extranets and the Internet.
 
     We were incorporated in February 1996 and began operations in August 1996.
During the period from February 1996 through December 31, 1996, we were a
development stage enterprise and had no revenues. Our operating activities
during this period related primarily to developing our products, building our
corporate infrastructure and raising capital.
 
     In January 1997, we released our first version of Castanet and, to date,
have derived substantially all our revenues from the license of Castanet and
related services. We licensed Castanet in early 1997 to enterprises primarily
for pilot programs that involved limited deployments. In 1997, we grew our
organization by hiring personnel in key areas, particularly sales, research and
development and marketing. During 1998, we continued to develop and market our
Castanet products and enhanced the core Castanet infrastructure with products
that provided greater centralized management control and the ability to
distribute applications written in leading programming languages. Also in 1998,
we sold several licenses of Castanet to repeat customers for larger scale
production deployments. During this time period, we continued to make
substantial investments in our internal infrastructure by hiring employees
throughout the organization. In March 1999 we released Castanet 4.0, which
provides enhanced Internet services management capabilities.
 
     Revenues to date have been derived primarily from the license of our
Castanet products and to a lesser extent from maintenance and support,
consulting and training services. Customers who license Castanet generally
purchase maintenance contracts, typically covering a 12-month period.
Additionally, customers may purchase consulting, which is customarily billed by
us at a fixed daily rate plus out-of-pocket expenses. We also offer training
services that are billed on a per student or per class session basis.
 
     We recognize software license revenue in accordance with Statement of
Position 97-2 "Software Revenue Recognition," as amended by Statement of
Position 98-4. These statements provide guidance on applying generally accepted
accounting principles in recognizing revenue on software transactions and are
effective for our transactions entered into after January 1, 1998. The
application of SOP 97-2 has not had a material impact on our results of
operations.
 
     In December 1998, the AICPA issued SOP 98-9, Modification of SOP 97-2,
Software Revenue Recognition, with respect to Certain Transactions. SOP 98-9
amends SOP 97-2 and SOP 98-4 extending the deferral of the application of
provisions of SOP 97-2 amended by SOP 98-4 through fiscal years beginning on or
before March 15, 1999. All other provisions of SOP 98-9 are effective for
transactions entered into in fiscal years beginning after March 15, 1999. We
have not yet determined the effect of the final adoption of SOP 98-9 on our
financial condition or operating results. However, Marimba believes that SOP
98-9 may require more revenue to be deferred for some types of transactions.
 
     License revenues are comprised of perpetual or multiyear license fees which
are primarily derived from contracts with corporate customers and resellers. We
recognize license revenues after execution of a license agreement or receipt of
a definitive purchase order and delivery of the product to end-user customers,
provided that there are no uncertainties surrounding product acceptance, the
license fees are
 
                                       20
<PAGE>   21
 
fixed and determinable, collectibility is probable and we have no remaining
obligations. Revenues on arrangements with customers who are not the ultimate
users, primarily resellers, are not recognized until the software is sold
through to the end user. If the fee due from the customer is not fixed or
determinable, revenues are recognized as payments become due from the customer.
If collectibility is not considered probable, revenues are recognized when the
fee is collected. Advance payments are recorded as deferred revenue until the
products are delivered, services are provided, or obligations are met. Service
revenues are comprised of revenues from maintenance agreements, consulting and
training fees. Revenues from maintenance agreements are recognized on a
straight-line basis over the life of the related agreement, which is typically
one year. We recognize service revenues from training and consulting upon
completion of the work to be performed.
 
     We market our products worldwide through a combination of a direct sales
force, resellers, system integrators and distributors. Tivoli has been a
reseller of our products and accounted for $3.1 million, or approximately 18% of
our revenues in 1998. This includes $1.9 million, or approximately 40% of our
revenues, in the third quarter of 1998 and $1.1 million, or approximately 20% of
our revenues, in the fourth quarter of 1998. Our reseller agreement with Tivoli
provides for the resale of our products at substantial discounts from list
price. Consequently, the gross margin on these sales is generally lower than the
gross margin on our direct sales.
 
     We have an original equipment manufacturer agreement with Tivoli under
which Tivoli has built upon the Castanet infrastructure to develop a product
called Cross-Site, which was released in April 1999. Any revenues from Tivoli
under this agreement will be from per seat royalty payments on sales of
Cross-Site that contain the Castanet infrastructure. The per seat payments under
this agreement will be less than the per seat payments we currently have under
our reseller agreement with Tivoli. We expect to generate revenues from
royalties on sales of Cross-Site beginning in 1999 and expect that revenues from
the resale of Castanet under the Tivoli reseller agreement will rapidly decrease
and become insignificant. Any failure of Cross-Site to achieve widespread market
acceptance could significantly harm our business and operating results.
 
     We entered into a reseller agreement with Netscape in July 1997. Sales by
Netscape accounted for $1.0 million, or approximately 18% of our revenues in
1997, and $3.8 million, or approximately 22% of our revenues in 1998. A majority
of the $3.8 million of 1998 revenues was recognized in the first half of 1998,
with only $1.3 million in revenue recognized in the second half of 1998.
Netscape is no longer an active reseller, and we do not expect any material
revenues from Netscape in the future.
 
     In 1997 and 1998, revenues attributable to customers outside of North
America accounted for approximately 22% and 7% of our total revenues. We plan to
expand our international operations significantly, particularly in Europe,
because we believe international markets represent a significant growth
opportunity. The expansion of our international operations will be subject to a
variety of risks that could significantly harm our business and results of
operations.
 
     Despite our revenue growth, we have incurred significant losses since
inception and, as of December 31, 1998, we had an accumulated deficit of
approximately $14.6 million. We believe our success depends on further
increasing our customer base and on growth in the emerging Internet services
management market. Accordingly, we intend to continue to invest heavily in
sales, marketing and research and development. Furthermore, we expect to
continue to incur substantial operating losses at least through 1999, and our
expected increase in operating expenses will require significant increases in
revenues before we become profitable.
 
     In view of the rapidly changing nature of our business and our limited
operating history, we believe that period-to-period comparisons of revenues and
operating results are not necessarily meaningful and should not be relied upon
as indications of future performance. Additionally, despite our sequential
 
                                       21
<PAGE>   22
 
quarterly revenue growth during 1998, we do not believe that historical growth
rates are necessarily sustainable or indicative of future growth.
 
RESULTS OF OPERATIONS
 
     The following table presents selected financial data for the periods
indicated as a percentage of total revenues. Data for the 1996 inception period
is not presented because we had no revenues during that period.
 
<TABLE>
<CAPTION>
                                                                 YEAR ENDED
                                                                DECEMBER 31,
                                                              -----------------
                                                               1997       1998
                                                              ------      -----
<S>                                                           <C>         <C>
CONSOLIDATED STATEMENT OF OPERATIONS DATA:
Revenues:
  License...................................................    90.1%      81.4%
  Service...................................................     9.9       18.6
                                                              ------      -----
Total revenues..............................................   100.0      100.0
Cost of revenues:
  License...................................................     0.2        0.4
  Service...................................................    11.2       11.5
                                                              ------      -----
Total cost of revenues......................................    11.4       11.9
                                                              ------      -----
Gross profit................................................    88.6       88.1
Operating expenses:
  Research and development..................................    43.3       33.8
  Sales and marketing.......................................   144.8       72.4
  General and administrative................................    42.5       16.3
  Amortization of deferred compensation.....................      --        1.5
                                                              ------      -----
Total operating expenses....................................   230.6      124.0
                                                              ------      -----
Loss from operations........................................  (142.0)     (35.9)
Interest income, net........................................     6.1        2.8
                                                              ------      -----
Loss before income taxes....................................  (135.9)     (33.1)
Provision for income taxes..................................    (2.8)      (0.2)
                                                              ------      -----
Net loss....................................................  (138.7)%    (33.3)%
                                                              ======      =====
</TABLE>
 
1996 INCEPTION PERIOD AND YEARS ENDED DECEMBER 31, 1997 AND 1998
 
     REVENUES
 
     Total revenues increased $11.5 million, or 207%, from $5.6 million in 1997
to $17.1 million in 1998. We had no revenues during the 1996 inception period.
 
     License Revenues. Substantially all license revenues have been derived from
sales of our Castanet products and increased $8.9 million, or 177%, from $5.0
million in 1997 to $13.9 million in 1998. We attribute the increase in license
revenues from 1997 to 1998 to:
 
     - growth in our customer base;
 
     - additional sales to existing customers; and
 
     - an increase in the average contract amount of executed license
       agreements.
 
     Service Revenues. Service revenues include maintenance and support,
consulting and training. Service revenues increased $2.6 million, or 477%, from
$552,000 in 1997 to $3.2 million in 1998. As a
 
                                       22
<PAGE>   23
 
percentage of total revenues, service revenues increased from 10% of total
revenues in 1997 to 19% of total revenues in 1998. The increase in service
revenues was due primarily to increased revenues from customer maintenance
contracts. Also, we increased our consulting service revenues as customers
elected to utilize our consulting organization. During 1999, we expect service
revenues to increase in absolute amount and as a percentage of total revenues.
An increased shift in our revenue mix toward services would negatively impact
our gross margins because service revenues have higher costs and therefore lower
margins than license revenues.
 
     COSTS OF REVENUES
 
     Cost of License Revenues. Cost of license revenues consists primarily of
the fees for third-party software products integrated into our products. Cost of
license revenues increased from $13,000 in 1997 to $75,000 in 1998. We had no
cost of license revenues in 1996. The increase from 1997 to 1998 was due to a
third-party software product that we licensed on September 30, 1997 and embedded
in Castanet. Therefore, in 1997, cost of license revenues includes costs
associated with this license only for the fourth quarter, whereas 1998 includes
a full year of these costs. We expect cost of license revenues to increase in
absolute amount during 1999, but to remain a relatively small percentage of
total revenues.
 
     Cost of Service Revenues. Cost of service revenues includes:
 
     - salaries and related expenses of our customer support organization;
 
     - salaries and related expenses of our consultants for billable consulting
       engagements;
 
     - cost of third parties contracted to provide consulting services to our
       customers; and
 
     - an allocation of our facilities and depreciation expenses.
 
     Cost of service revenues increased from $621,000 in 1997 to $2.0 million in
1998, representing 113% and 62% of service revenue. The increase in absolute
dollars of cost of service revenues from 1997 to 1998 was due primarily to
growth in our customer support organization and an increase in consulting costs
commensurate with the increase in consulting revenues. Our customer support
organization had no employees at January 1, 1997 and grew to 12 employees at
both December 31, 1997 and December 31, 1998. We had no cost of service revenues
in 1996. We expect our cost of service revenues to increase as we continue to
expand our customer support and consulting organizations. Since service revenues
provide lower gross margins than license revenues, this expansion would
negatively impact our gross margins if our license revenues do not significantly
increase.
 
     OPERATING EXPENSES
 
     Research and Development. Research and development expenses, which are
expensed as incurred, consist primarily of:
 
     - salaries and related costs of our engineering organization;
 
     - fees paid to third-party consultants; and
 
     - an allocation of our facilities and depreciation expenses.
 
     We believe that our success is dependent in large part on continued
enhancement of our current products and the ability to develop new,
technologically advanced products that meet the sophisticated requirements of
our customers. Accordingly, we have increased our investment in research and
development in each of the periods since inception. Research and development
expenses increased from $515,000 in the 1996 inception period to $2.4 million in
1997 and $5.8 million in 1998. The increases in research and development
expenses were due to significant increases in engineering personnel and related
costs, as well as increases in third-party consulting costs. We expect research
and development expenses to increase in absolute amount in 1999.
 
                                       23
<PAGE>   24
 
     Sales and Marketing. Sales and marketing expenses consist primarily of:
 
     - salaries and related costs of our sales and marketing organizations;
 
     - sales commissions;
 
     - costs of our marketing programs, including public relations, advertising,
       trade shows, collateral sales materials, our customer advisory council
       and seminars;
 
     - rent and facilities costs associated with our regional and international
       sales offices; and
 
     - an allocation of our facilities and depreciation expenses.
 
     We have significantly increased our sales and marketing expenses since the
1996 inception period. Sales and marketing expenses increased from $473,000 in
the 1996 inception period to $8.1 million in 1997 and $12.4 million in 1998. The
increases in sales and marketing expenses are due primarily to significant
growth in our sales and marketing organizations, an increase in sales
commissions as sales have increased, an increase in the number of regional and
international sales offices and expansion of our marketing programs. We
increased the number of sales and marketing personnel from six employees at
December 31, 1996 to 45 employees at December 31, 1997 and 65 employees at
December 31, 1998. Marimba also increased the number of sales offices from one
at December 31, 1996 to two at December 31, 1997 and to seven at December 31,
1998. Sales commission expense increased by 54% from 1997 to 1998. There was no
sales commission expense in 1996. We expect to continue to invest heavily in
sales and marketing in order to grow revenues and expand our brand awareness.
Consequently, we expect to increase the absolute dollar amount of sales and
marketing expenses in 1999.
 
     General and Administrative. General and administrative expenses consist
primarily of:
 
     - costs of our finance, human resources and legal services organizations;
 
     - third-party legal and other professional services fees; and
 
     - an allocation of our facilities and depreciation expenses.
 
     General and administrative expenses increased from $322,000 in the 1996
inception period to $2.4 million in 1997 and $2.8 million in 1998. We attribute
the increases in general and administrative expenses to growth of our
administrative organizations in support of overall growth. We increased our
general and administrative personnel from 13 at December 31, 1997 to 21 at
December 31, 1998. We expect the absolute dollar amount of general and
administrative expenses to increase in 1999.
 
     Additionally, we have incurred significant outside legal costs in defense
of Novadigm's complaint against us alleging patent infringement filed in March
1997. We expect to incur significant additional costs related to this complaint
in the future, and these costs will increase substantially if we go to trial. A
trial is currently scheduled for September 1999.
 
     Deferred Compensation. We recorded deferred compensation of approximately
$1.4 million in 1998, representing the difference between the exercise prices of
options granted to acquire 940,500 shares of common stock during 1998 and the
deemed fair value for financial reporting purposes of our common stock on the
grant dates. We amortized deferred compensation expense of $251,000 during
fiscal 1998. This compensation expense relates to options awarded to individuals
in all operating expense categories. Total deferred compensation at December 31,
1998 of $1.1 million is being amortized over the vesting periods of the options
on a graded vesting method. In addition, we granted options to purchase common
stock in April 1999 for which we will record additional deferred compensation of
$2.1 million which will be amortized over the vesting periods of the options on
a graded vesting method. The amortization of deferred compensation recorded will
approximate $1,410,000 for 1999, $1,008,000 for 2000, $530,000 for 2001,
$230,000 for 2002 and $33,000 for 2003.
 
                                       24
<PAGE>   25
 
     INTEREST INCOME, NET
 
     Interest income, net consists primarily of interest earned on our cash,
cash equivalents and short term investments offset by interest expenses
associated with our capital leases and equipment advances. Interest income, net
increased from $65,000 in the 1996 inception period to $338,000 in 1997 and
$488,000 in 1998. The increases in interest income, net relate primarily to
increased invested cash balances from our equity financings in August 1996 and
August 1997.
 
     PROVISION FOR INCOME TAXES
 
     Our provision for income taxes for the years ended December 31, 1997 and
1998 consists entirely of foreign withholding taxes. No provision for federal or
state income taxes has been recorded because we experienced net losses from
inception through 1998.
 
     As of December 31, 1998, we had federal net operating loss carryforwards of
approximately $11.1 million. We also had a federal research and development tax
credit carryforward of approximately $400,000 at that date. The net operating
loss and credit carryforwards will expire at various dates beginning in 2011
through 2018, if not utilized.
 
     Utilization of the net operating losses and credits may be subject to a
substantial annual limitation due to the ownership change limitations contained
in the Internal Revenue Code of 1986 and similar state provisions. The annual
limitation may result in the expiration of the net operating loss and credits
before utilization.
 
                                       25
<PAGE>   26
 
QUARTERLY RESULTS OF OPERATIONS
 
     The following table presents our unaudited quarterly operating results for
the four quarters of 1998. You should read the following table together with our
Consolidated Financial Statements and related Notes in this prospectus. We have
prepared this unaudited information on the same basis as the audited
Consolidated Financial Statements. This table includes all adjustments,
consisting only of normal recurring adjustments, that we consider necessary for
a fair presentation of our financial position and operating results for the
quarters presented. You should not draw any conclusions about our future results
from the operating results for any quarter.
 
<TABLE>
<CAPTION>
                                                              THREE MONTHS ENDED
                                                ----------------------------------------------
                                                MARCH 31,    JUNE 30,    SEPT. 30,    DEC. 31,
                                                  1998         1998        1998         1998
                                                ---------    --------    ---------    --------
                                                                (IN THOUSANDS)
<S>                                             <C>          <C>         <C>          <C>
Revenues:
  License.....................................   $ 2,491     $ 3,155      $ 3,804     $ 4,451
  Service.....................................       519         526          929       1,210
                                                 -------     -------      -------     -------
Total revenues................................     3,010       3,681        4,733       5,661
Cost of revenues:
  License.....................................        17          16           16          26
  Service.....................................       488         396          482         598
                                                 -------     -------      -------     -------
Total cost of revenues........................       505         412          498         624
                                                 -------     -------      -------     -------
Gross profit..................................     2,505       3,269        4,235       5,037
Operating expenses:
  Research and development....................     1,211       1,311        1,545       1,706
  Sales and marketing.........................     2,082       2,715        3,638       3,936
  General and administrative..................       750         527          596         906
  Amortization of deferred
     compensation.............................        --          --           73         178
                                                 -------     -------      -------     -------
Total operating expenses......................     4,043       4,553        5,852       6,726
                                                 -------     -------      -------     -------
Loss from operations..........................    (1,538)     (1,284)      (1,617)     (1,689)
Interest income, net..........................       149         128          125          86
                                                 -------     -------      -------     -------
Loss before income taxes......................    (1,389)     (1,156)      (1,492)     (1,603)
Provision for income taxes....................        --          --           (4)        (37)
                                                 -------     -------      -------     -------
Net loss......................................   $(1,389)    $(1,156)     $(1,496)    $(1,640)
                                                 =======     =======      =======     =======
</TABLE>
 
     Revenues grew in each quarter of 1998 as demand for our products and
services increased. Commensurate with revenue growth, cost of license revenues
and cost of service revenues have generally increased from quarter to quarter.
Cost of service revenues was higher in the quarter ended March 31, 1998 relative
to the following two quarters due to travel, facilities rental and equipment
costs associated with providing an off-site training course.
 
     From inception, we have increased the level of spending throughout the
organization. We intend to increase our sales and marketing, research and
development and general and administrative expenses. We anticipate that these
expenses could significantly precede any revenues generated by the increased
spending. If we do not experience significantly increased revenues from these
efforts, our business and operating results would be seriously harmed.
 
     General and administrative expenses were higher in the first and fourth
quarters of 1998 than in the second and third quarters of 1998 primarily due to
higher legal expenses incurred in defense of Novadigm's complaint against us
alleging patent infringement. We expect to incur significant additional costs
related to this complaint in the future, and these costs will substantially
increase if we go to trial.
 
                                       26
<PAGE>   27
 
     Our quarterly operating results have fluctuated significantly and we expect
that future operating results will be subject to similar fluctuations. In the
past a significant portion of our sales have been realized near the end of the
quarter. Accordingly, a delay in an anticipated sale past the end of a
particular quarter could negatively impact our results of operations for that
quarter. In addition, we generally expect that revenues in the first quarter of
each year will be lower than the fourth quarter of the preceding year. We
believe this trend will be primarily due to the annual nature of budgetary,
purchasing and sales cycles.
 
RECENT DEVELOPMENTS
 
     Based on our preliminary analysis, revenues increased by $470,000, or 8%,
from $5.7 million in the fourth quarter of 1998 to $6.1 million in the first
quarter of 1999. Total revenues during the first quarter of 1999 were comprised
of $4.5 million from license revenues and $1.6 million from service revenues.
Increased revenues during the first quarter resulted from sales to new and
existing customers. In March 1999, Marimba released version 4.0 of its Castanet
products and had initial sales of this product.
 
     Our net loss remained relatively constant at $1.6 million for both the
fourth quarter of 1998 and the first quarter of 1999. Higher revenues in the
first quarter of 1999 were offset by higher operating expenses. We increased
operating expenses as we continued to expand our organization in all operating
areas.
 
     Basic and diluted net loss per share during the first quarter of 1999 was
$0.13 compared to $0.14 during the fourth quarter of 1998. The decrease in basic
and diluted net loss per share was due to an increase in the number of shares of
common stock outstanding that resulted from stock option exercises by employees.
 
     We believe that the unaudited financial information for the first quarter
of 1999 contains all adjustments needed to present fairly the information
discussed above, and that the adjustments made consist only of normal recurring
adjustments.
 
LIQUIDITY AND CAPITAL RESOURCES
 
     We have funded our operations primarily through the private placement of
our equity securities through which we have raised net proceeds of approximately
$19.0 million. We have also financed our operations through equipment lease
financing and bank borrowings. At December 31, 1998, our principal sources of
liquidity included approximately $7.8 million of cash, cash equivalents and
short term investments and a credit facility with a bank. This credit facility
provides us up to $6.5 million in total borrowings, of which $4.0 million of
borrowings are available for loans of up to 80% of our eligible accounts
receivable, $1.0 million is available under a non-formula based advance and $1.5
million is available for equipment advances. As of December 31, 1998, we had
$811,000 in outstanding borrowings for equipment advances. Borrowings under this
credit facility are provided at the bank's prime rate and are secured by
substantially all of our assets.
 
     The credit facility requires Marimba to maintain a minimum liquidity ratio
of not less than 1.50 to 1.00. The minimum liquidity ratio is defined as the sum
of unrestricted cash and cash equivalents divided by the aggregate amount of
equipment advances outstanding under the credit facility. We were in compliance
with the minimum liquidity ratio as of December 31, 1998 and February 28, 1999.
 
     The credit facility also requires Marimba to maintain minimum tangible net
worth of at least $10 million. Tangible net worth is defined as our tangible
assets less total liabilities, plus deferred revenue. As of December 31, 1998,
we were in compliance with the minimum tangible net worth requirement. However,
as of February 28, 1999, Marimba's tangible net worth was less than the required
$10 million. The bank granted us a waiver of this covenant for February 28,
1999. Furthermore, we expect to be in compliance with this requirement at March
31, 1999 and for the duration of the credit facility which
 
                                       27
<PAGE>   28
 
expires on May 26, 1999. We intend to repay this credit facility using a portion
of the net proceeds from this offering.
 
     Cash used in operations increased from $877,000 in the 1996 inception
period to $1.5 million in 1997 and $6.1 million in 1998 primarily due to our net
losses which were partially offset by increases in deferred revenues and
accounts receivable in 1997 and decreases in deferred revenues and accounts
receivable in 1998.
 
     Cash used in investing activities increased from $285,000 in the 1996
inception period to $2.7 million in 1997 and $5.4 million in 1998. We have made
substantial investments in computer equipment, computer software, office
furniture and leasehold improvements. In addition, cash used in investing
activities during 1998 included net purchases of short-term investments of $4.1
million.
 
     Net cash provided by financing activities was $4.0 million in the 1996
inception period, $15.8 million in 1997 and $861,000 in 1998. Net cash from
financing activities during the 1996 inception period resulted primarily from
the sale of preferred stock. Net cash from financing activities during 1997
resulted primarily from the sale of preferred stock and from the sale of common
stock issued upon exercise of stock options. During 1998, net cash from
financing activities resulted primarily from the sale of common stock issued
upon exercise of stock options and proceeds from equipment advances. We expect
to fund future operating expenses from revenues received from the sale of our
products and services and the proceeds of this offering.
 
     We currently anticipate that the net proceeds from this offering, together
with our current cash, cash equivalents, short-term investments and credit
facility, will be sufficient to meet our anticipated cash needs for working
capital and capital expenditures for at least the next 12 months. However, we
may need to raise additional funds in future periods through public or private
financings, or other arrangements to fund our operations and potential
acquisitions, if any, until we achieve profitability, if ever. Any additional
financings, if needed, might not be available on reasonable terms or at all.
Failure to raise capital when needed could seriously harm our business and
operating results. If additional funds are raised through the issuance of equity
securities, the percentage of ownership of our stockholders would be reduced.
Furthermore, these equity securities might have rights, preferences or
privileges senior to our common stock.
 
YEAR 2000 COMPLIANCE
 
     BACKGROUND OF YEAR 2000 ISSUES
 
     Many currently installed computer and communications systems and software
products are unable to distinguish 21st century dates from 20th century dates.
This situation could result in system failures or miscalculations causing
disruptions in the operations of any business. As a result, many companies'
software and computer and communications systems may need to be upgraded or
replaced to comply with these Year 2000 requirements.
 
     CUSTOMER REPRESENTATIONS AND WARRANTIES
 
     We generally represent and warrant to our customers that the occurrence of
the date January 1, 2000 and any related leap-year issues will not cause our
products to fail to operate properly. In some cases, this warranty includes
representations regarding the ability of our product to store, display,
calculate, compute and otherwise process date-related data. Our warranty
generally applies only to our products and excludes failures resulting from the
combination of our products with other software or hardware or from the use of
our software in a manner not in accordance with the related documentation.
 
     If we breach this warranty, remedies in most cases include commercially
reasonable efforts to replace the software and to advise the customer how to
achieve substantially the same functionality through different procedures, as
well as payment of money damages, subject to limitations.
 
                                       28
<PAGE>   29
 
     OUR PRODUCT TESTING AND LICENSING
 
     We have tested all of our products for Year 2000 compliance. We derived our
testing method from our review and analysis of the Year 2000 testing practices
of other software vendors, relevant industry Year 2000 compliance standards and
the specific functionality and operating environment of our products. The tests
are run on all supported platforms for each release and include testing for date
calculation and internal storage of date information with test numbers starting
in 1999 and going over the Year 2000 boundary. Based on these tests, we believe
our products to be Year 2000 compliant with respect to date calculations and
internal storage of date information.
 
     We have identified one Year 2000 date-related limitation in earlier
versions of Castanet. Versions of Castanet before version 3.2 display date
information to the user in a manner that uses only two digits to represent a
year. A two-digit display of the Year 2000 could cause a user to believe the
year represented was the Year 1900 instead of the Year 2000. This limitation
does not affect either computation of data in our products or operation of the
products. All versions of Castanet currently being shipped use four digits for
the display of date data.
 
     INTERACTION OF OUR PRODUCTS WITH THIRD-PARTY SOFTWARE
 
     Our products contain, operate with and depend on third-party code that we
may not be able to independently verify is Year 2000 compliant. Substantially
all of our products interface with and depend on Sun's JVM (Java Virtual
Machine). Sun has indicated that the version of the JVM on which Castanet 3.0,
Castanet 4.0, and all later versions depend, is Year 2000 compliant, but Sun has
made no similar statement regarding earlier versions of the JVM. Our products
also contain and depend on software licensed to us from RSA Data Security, Inc.,
Netscape, VeriSign, Inc. and Phaos Technology Corporation. Although each of
those companies has made representations that the licensed code is Year 2000
compliant, we may not be able to verify this by independent testing. Finally,
our products also interact with external sources including as other software
programs and operating systems which may not be Year 2000 compliant or which may
not provide date data to our products in a manner that is Year 2000 compliant.
Any interaction with third-party software which is not Year 2000 compliant could
cause our products to fail to properly operate or to properly process date
information.
 
     OUR INTERNAL SYSTEMS
 
     Although we do not have a formal contingency plan to address Year 2000
issues, we are in the preliminary stages of assessing our internal risks
associated with the Year 2000 issue. We are working internally and with
third-party vendors to assure that we are prepared for the Year 2000. We have
inventoried our internal software and hardware systems, as well as products and
services provided by third-party vendors. These systems include those related to
product delivery, customer service, internal and external communications,
accounting and payroll, which we consider critical areas of our business. We are
seeking vendor certification for all third-party systems and plan to develop a
detailed risk assessment and action plan that will include testing of both
critical systems and systems for which no certification has been obtained. The
identification, certification and risk assessment phases of our Year 2000
project are expected to be completed by the end of April 1999. Subsequent phases
will include our own tests, tests conducted by third-party consultants and the
development of contingency plans and/or corrective solutions for systems which
have been identified to be noncompliant. We expect these phases will continue
through the first half of 1999.
 
     COSTS OF ADDRESSING YEAR 2000 COMPLIANCE
 
     To date, our costs to address Year 2000 compliance have not been
significant. Based on our preliminary evaluations, we do not believe we will
incur significant operating expenses or be required to invest heavily in
computer system improvements to be Year 2000 compliant. Although we have not yet
developed an exact estimate of these costs, we expect the total costs to be less
than $100,000. However,
 
                                       29
<PAGE>   30
 
significant uncertainty exists concerning the potential costs and effects
associated with Year 2000 compliance. Any Year 2000 compliance problem
experienced by us or our customers could decrease demand for our products which
could seriously harm our business and operating results.
 
RECENT ACCOUNTING PRONOUNCEMENTS
 
     In March 1998, the AICPA issued SOP No. 98-1, Accounting for the Costs of
Computer Software Developed or Obtained for Internal Use. SOP No. 98-1 requires
entities to capitalize selected costs related to internal-use software once
specified criteria have been met. We expect that the adoption of SOP No. 98-1
will not have a material impact on our financial position or operating results.
We will be required to implement SOP No. 98-1 for the year ending December 31,
1999.
 
     In April 1998, the AICPA issued SOP No. 98-5, Reporting on the Costs of
Start-Up Activities. SOP No. 98-5 requires that all start-up costs related to
new operations must be expensed as incurred. In addition, all start-up costs
that were capitalized in the past must be written off when SOP No. 98-5 is
adopted. We expect that the adoption of SOP No. 98-5 will not have a material
impact on our financial position or results of operations. We will be required
to implement SOP No. 98-5 for the year ending December 31, 1999.
 
     In June 1998, the Financial Accounting Standards Board issued SFAS No. 133,
Accounting for Derivative Instruments and Hedging Activities. SFAS No. 133
establishes methods for derivative financial instruments and hedging activities
related to those instruments, as well as other hedging activities. Because we do
not currently hold any derivative instruments and do not engage in hedging
activities, we expect that the adoption of SFAS No. 133 will not have a material
impact on our financial position or results of operations. We will be required
to implement SFAS No. 133 for the year ending December 31, 2000.
 
QUALITATIVE AND QUANTITATIVE DISCLOSURES ABOUT MARKET RISK
 
     We develop products in the United States and sell in North America, Asia
and Europe. As a result, our financial results could be affected by various
factors, including changes in foreign currency exchange rates or weak economic
conditions in foreign markets. As all sales are currently made in U.S. dollars,
a strengthening of the dollar could make our products less competitive in
foreign markets. Our interest income is sensitive to changes in the general
level of U.S. interest rates, particularly since the majority of our investments
are in short-term instruments. Due to the nature of our short-term investments,
we have concluded that there is no material market risk exposure. Therefore, no
quantitative tabular disclosures are required.
 
     Our investment policy requires us to invest funds in excess of current
operating requirements in:
 
     - obligations of the U.S. government and its agencies;
 
     - investment grade state and local government obligations;
 
     - securities of U.S. corporations rated A1 or AA by Standard and Poors or
       the Moody's equivalent; and
 
     - money market funds, deposits or notes issued or guaranteed by U.S. and
       non-U.S. commercial banks meeting particular credit rating and net worth
       requirements with maturities of less than two years.
 
At December 31, 1998, our cash and cash equivalents consisted primarily of
demand deposits and money market funds held by large institutions in the U.S.
and our short-term investments were invested in corporate debt and equity
securities maturing in less than one year.
 
                                       30
<PAGE>   31
 
                                    BUSINESS
 
OVERVIEW
 
     Marimba is a leading provider of Internet-based software management
solutions that enable companies to expand their market reach, streamline
business processes and strengthen relationships with customers, business
partners and employees. Our Castanet product family provides an efficient and
reliable way for enterprises to distribute, update and manage applications and
related data over corporate intranets, extranets and the Internet. Our strategy
is to extend the Castanet foundation to manage the array of infrastructure,
systems and components upon which business applications and services depend. We
believe that, by using Castanet, companies are able to leverage the Internet
more efficiently by reducing software management costs, delivering greater
functionality and improving customer loyalty. Our global customer base spans
multiple industry segments including financial services, insurance, retail,
manufacturing and telecommunications. Castanet customers include various
industry leaders, including Bear Stearns, Charles Schwab, EarthLink, The Home
Depot, Intuit, Ingram Micro, Nortel Networks, Seagate Technology and Sun
Microsystems. We market our Castanet products worldwide through a combination of
a direct sales force, resellers and distributors.
 
INDUSTRY BACKGROUND
 
     In today's intensely competitive business environment, companies
aggressively seek new ways to leverage information technology for competitive
advantage. The Internet has emerged as a crucial business tool, offering the
prospect of ubiquitous, easy-to-use and cost-effective connectivity to anyone,
anywhere, internal or external to the corporate network. As the commercial use
of the Internet grows, companies are delivering increasingly sophisticated
services to a rapidly expanding audience. As a result, demands on the Internet
infrastructure have grown and the enterprise computing environment is evolving
and becoming increasingly complex. Today, companies are extending their
enterprises and starting to use the Internet to connect to their business
partners and customers in fundamentally new ways. Organizations are leveraging
the Internet to deliver services that extend their business processes to
networked, mobile and remote employees, customers, suppliers, vendors,
distributors and other partners.
 
     This emerging use of the Internet by businesses, which is often referred to
as "e-business," encompasses business-to-business, business-to-employee and
business-to-consumer communications and transactions. As they adopt e-business,
companies are integrating, co-locating and redistributing their business
processes with those of their strategic partners and customers. By linking these
business processes across the extended enterprise, companies are creating a new
type of service offering for their strategic partners and customers that
requires the ability to deliver business applications and information
dynamically. For example, by directly sharing the information and analysis of an
inventory management application, companies and their suppliers and distributors
can manage supply chain issues in real-time. Alternatively, by providing online
applications including financial portfolio management, companies can offer
personalized, up-to-date account information that creates immediate value for
their customers. When companies are able to offer easy-to-access, compelling,
up-to-date applications and information as services, they create closer business
relationships, new efficiencies and significant strategic advantages. As a
result of these benefits, the e-business market is large and growing rapidly.
International Data Corporation, an independent research firm, estimates that
e-commerce, the subset of e-business that encompasses the sale of goods and
services over the Internet, will grow from $32 billion in 1998 to $426 billion
in 2002.
 
     In embracing e-business, companies are extending their information
technology infrastructure beyond the organization and moving their core business
applications and processes to the Internet. Before the commercial adoption of
the Internet as a business platform, corporations primarily focused on
connecting the physical computing network infrastructure within their own
organizations and deploying application software to automate internal business
processes. As companies now extend their enterprise
 
                                       31
<PAGE>   32
 
information technology infrastructure, they face significant new challenges. In
an e-business environment where corporate information technology domains are
being extended, application availability, security and performance are dependent
on the management of a complex, heterogeneous array of systems and services. In
addition, the dynamic nature of e-business requires companies to ensure that
applications and information are up to date. As companies' e-business services
grow, they must be able to rapidly scale their services to thousands, or even
millions, of users. These users are often only intermittently connected to the
network and may be outside the corporation's control. The public nature of the
Internet also exposes the enterprise to heightened security risks. Finally, as
e-business applications are increasingly being advertised and delivered as
services, organizations and their customers are demanding the same high levels
of availability, ease of use and quality of service that they expect from common
utilities including electricity and telephone systems.
 
     The evolution of enterprise computing to an Internet-based infrastructure
is creating enormous complexity for organizations and producing significant
challenges, similar to those faced by companies as they moved from mainframe
computing to client-server environments. At that time, the need to manage
complex client-server environments gave rise to a large market for network and
systems management solutions. However, these solutions were not designed for an
Internet-based infrastructure. As a result, they do not adequately address
challenges including connectivity, management of endpoints outside of the
firewall and security requirements of a public network, and massive scalability,
all of which are critically important when delivering services across the
Internet.
 
     These challenges have created the need for a new Internet services
management solution that supports e-business services across the extended
enterprise. A complete Internet services management solution would provide not
only the management of e-business applications on an ongoing basis, but also
management of the infrastructure upon which those applications depend. For
example, an e-business platform would typically be comprised of a set of
business applications, plus a number of components, including web servers,
database management systems, application servers and software security systems.
A complete Internet services management solution will ultimately enable an
information technology department to first deploy and then manage, maintain and
monitor this e-business infrastructure across companies, domains and
geographies.
 
THE MARIMBA SOLUTION
 
     Marimba is a leading provider of Internet-based software management
solutions that enable companies to expand their market reach, streamline
business processes and strengthen relationships with customers, business
partners and employees. Our Internet services management solutions help solve
complex deployment and management problems that we believe are not adequately
addressed by existing client-server based distribution and management products.
An essential foundation of a complete Internet services management solution is
the ability to effectively deliver and manage applications and information
throughout the extended enterprise. Built from the ground up to provide a robust
Internet-based infrastructure, our Castanet software product family provides
automated distribution, transparent updates and ongoing management of e-business
applications, application-related data, business rules, documents and services
throughout the extended enterprise. Our Castanet product family is modular,
allowing organizations to plug-in functionality as their e-business requirements
expand. In addition, Castanet is designed to provide the reliability,
performance and security that organizations require for their business-critical
e-business applications and services. As a result, we believe our customers are
able to leverage their networks more efficiently and obtain greater
functionality from their business applications.
 
                                       32
<PAGE>   33
 
     We believe that the benefits of our Castanet solution will address the
Internet services management needs of leading corporations and service
providers. Key benefits of this solution include:
 
     Reduces Total Cost of Managing the Extended Enterprise. Castanet
facilitates the centralized management of the extended enterprise by enabling
automated, electronic distribution, installation and updates of applications and
related data. In so doing, we believe that Castanet lowers information
technology costs by reducing resources previously required to manually
distribute and customize software. Castanet can further reduce support costs by
removing the burden of software installation and management from the end-user
and by automatically synchronizing application versions across multiple users.
In addition, by replacing only the applications or data that have changed,
Castanet enables rapid and efficient updates, thereby reducing network
connection charges and enabling corporations to realize increased benefits from
their network bandwidth investment.
 
     Increases Efficiency of the Extended Enterprise. Castanet provides
organizations with a simple and rapid way to distribute new or updated
applications and information across a complex, distributed and heterogeneous
computing environment. Through access control and policy management, Castanet
enables the collaborative exchange of applications and data among users and
across companies. By enabling organizations to extend access to their data and
applications across the extended enterprise, we believe that Castanet can
increase the efficiency and usefulness of an organization's information and
technology assets. Employees, customers, suppliers, vendors and other partners
can receive the most recent and relevant data directly, reducing an
organization's support requirements. Mobile users can work off-line and receive
the latest updates when they connect to the network. By enabling rapid updates,
Castanet can reduce the time and frustration often associated with obtaining
software and data updates remotely. In addition, because users automatically
receive the most current information, organizations can reduce the inefficiency
caused by outdated information and applications.
 
     Provides Robust Infrastructure for Mission-Critical Applications. Castanet
enables companies to distribute and update business-critical applications
throughout the extended enterprise in a reliable and efficient manner. When
corporations transmit sensitive e-business applications and data across public
or private networks, precautions must be taken to authenticate user identity,
verify application and data integrity, and protect data confidentiality.
Castanet provides comprehensive security functionality, including digital
certificates, encryption and end-user access control. Castanet can rapidly scale
to allow organizations to distribute applications and upgrades to large numbers
of users in geographically dispersed locations. We believe this architecture
helps organizations improve application performance and reduce network traffic.
If a download is interrupted, Castanet can automatically restart at the point of
interruption when it reconnects without corrupting the original application or
file.
 
     Enhances Customer Relationships. As corporations extend their enterprise to
customers, business partners and employees worldwide, it is becoming
increasingly important to deliver personalized services, content and user
interfaces to individual customers or target groups. Castanet enables the
tailoring of services through automatic identification of target user groups, or
through server extensions which allow the automated selection of code and
content. In addition, Castanet provides the ability to create and package custom
user interfaces. Using the customization and branding functions available with
Castanet, information technology and operational managers can define and enforce
consistent application configurations and branding across the extended
enterprise. We believe that each of these capabilities allows companies to
strengthen their brand and offer more compelling Internet-based services
resulting in increased customer loyalty.
 
STRATEGY
 
     Our objective is to become the leading provider of Internet services
management solutions. We are pioneering this new and emerging market and have
established a foundation upon which we can build to
 
                                       33
<PAGE>   34
 
address the growing needs of the extended enterprise. The key elements of our
strategy to achieve our objective are:
 
     Extend Technological Leadership Position. We are the first company to
provide an integrated product suite that has been designed from the ground up to
provide e-business application distribution and management solutions across the
extended enterprise. We believe that our application distribution and management
solutions provide us with a first mover advantage and an essential foundation
for a comprehensive Internet services management solution. We intend to advance
our technological leadership by investing significant resources in research and
development. In addition, by implementing and actively promoting new industry
standards, we intend to facilitate widespread adoption of Castanet by
enterprises conducting e-business.
 
     Target Companies and Service Providers Conducting E-business. We intend to
expand adoption of Castanet by focusing our efforts on selling to large
companies in industry sectors where the deployment of e-business solutions
provides a key competitive advantage. While many large companies are now
engaging in some form of e-business, we believe that Castanet is particularly
attractive to companies in industry sectors including financial services,
insurance, health care, manufacturing, retail, technology and telecommunications
given their sophisticated technological needs. We believe that our experience in
successfully providing Castanet solutions to industry-leading companies provides
us a competitive advantage in selling Castanet to potential customers. Castanet
provides an enabling infrastructure for application service providers and
Internet service providers to distribute and remotely manage applications
services simply, efficiently and at a low cost.
 
     Expand Worldwide Sales. We believe that international markets represent a
significant growth opportunity as organizations seek global e-business
solutions. We currently have a direct sales presence in North America and
Europe. In the Asia/Pacific region, we sell our Castanet products through third-
party distributors. We intend to expand our direct sales force and to establish
additional sales offices domestically and internationally. In addition, we plan
to complement our current distribution channels with selected resellers, system
integrators and joint marketing partners to expand our market reach.
 
     Expand Professional Services. We believe that our experienced team of
consultants, support engineers and training staff provide a key competitive
advantage in the sale of the Castanet solution. We intend to expand this team
and continue to invest in the advanced level of training required to provide
superior service to our customer base. In addition, we believe that the complex
and strategic nature of Internet services management software provides us with a
significant opportunity to provide consulting services to customers to help them
successfully develop, deploy and maintain their e-business applications.
 
     Each of the elements of our strategy are ongoing efforts and we do not have
specific implementation dates.
 
                                       34
<PAGE>   35
 
CASTANET PRODUCT FAMILY
 
     The Castanet product family provides a robust framework to distribute,
update and manage applications and related data over corporate intranets,
extranets and the Internet to multiple endpoints, including servers, desktops
and mobile systems. Designed upon an open, extensible architecture, our Castanet
products automatically recover from transmission errors, provide a variety of
security features, reduce network connection time, allow personalization and are
rapidly scalable to a large number of users in geographically dispersed
locations. The Castanet product family is modular, allowing organizations to add
functionality as their e-business management requirements expand. Each
generation of Castanet has introduced additional functionality including
Castanet 4.0, released in March 1999, which added the Castanet Inventory Suite
and Castanet Subscription Suite. The Castanet product family is summarized
below:
 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
             CASTANET PRODUCT FAMILY                                       BENEFITS
<S>                                                   <C>
- --------------------------------------------------------------------------------------------------------
 CASTANET INFRASTRUCTURE SUITE:                       - Supports multiple applications across
                                                      heterogeneous computing environments, in one
 The Infrastructure Suite provides the foundation       integrated solution
 upon which all other Castanet product suites are
 built. It provides the components necessary to       - Provides security features to authenticate users
 distribute, manage and maintain applications         and help protect data integrity and
 across intranets, extranets and the Internet.          confidentiality
                                                      - Provides bandwidth efficiency, lowering network
                                                        connection costs
                                                      - Supports mobile and remote users, who may be
                                                      only intermittently connected to the network
                                                      - Supports personalization, making it easy to
                                                      install and manage appropriate application
                                                        versions for each user
                                                      - Rapidly scales to a large number of users in
                                                        geographically dispersed locations
                                                      - Utilizes open standards and extends to meet
                                                      changing user requirements
- --------------------------------------------------------------------------------------------------------
 CASTANET PRODUCTION SUITE:                           - Automates the application publishing process
 The Production Suite provides the ability to         - Provides easy-to-use interfaces for defining the
 package and publish custom or off-the-shelf          way applications are configured
 applications, files and documents for
 distribution by the Castanet Infrastructure          - Reduces software and platform dependencies
 Suite.
                                                      - Provides the ability to customize the
                                                      application installation process to shield end
                                                        users from software installation complexities
- --------------------------------------------------------------------------------------------------------
 CASTANET MANAGEMENT SUITE:                           - Helps trouble-shoot and test Castanet
                                                      deployments
 The Management Suite provides comprehensive
 solutions for the management, deployment and         - Streamlines application rollouts across multiple
 maintenance of enterprise-wide Castanet                organizations
 installations. The suite permits centralized
 monitoring and control of local and remote           - Provides usage reports and log files
 Castanet servers and clients. Optional extensions
 to the Management Suite also provide extensive       - Strengthens brand awareness by allowing
 client customization and branding capabilities.      information technology managers and business
                                                        organizations to customize user interfaces
- --------------------------------------------------------------------------------------------------------
</TABLE>
 
                                       35
<PAGE>   36
 
<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------------------------------
             CASTANET PRODUCT FAMILY                                       BENEFITS
<S>                                                   <C>
- --------------------------------------------------------------------------------------------------------
 CASTANET INVENTORY SUITE:                            - Automates collection of inventory information,
                                                        including application, network, computer
 The Inventory Suite simplifies the discovery,          hardware and operating system information
 tracking and management of the desktop, server
 and portable computing resources within the          - Supports intermittently connected computing
 enterprise. By providing database integration and      resources, providing network managers with
 reporting capabilities, the suite is designed to       greater inventory accuracy and administrative
 allow administrators to generate up to date            control
 information on machines within their domains of
 control, even if they are only connected             - Provides the ability to view inventory
 intermittently to a network.                         information and perform searches
                                                      - Supports relational database storage for
                                                      enterprise-wide access, data consolidation and
                                                        reporting
                                                      - Enables customization of inventory parameters
                                                      and schedules
- --------------------------------------------------------------------------------------------------------
 CASTANET SUBSCRIPTION SUITE:                         - Streamlines definition of enterprise-wide
 The Subscription Suite is designed to provide        application subscription policies based on user
 corporate information technology managers with         profiles
 the ability to use existing profile information
 to define, distribute and enforce a centralized      - Automates distribution and enforcement of
 subscription policy that determines which            enterprise-wide application subscription policies
 applications should be made available, installed
 or deleted from a user's machine.                    - Integrates with user profile information from
                                                      multiple sources
                                                      - Supports multiple application subscription
                                                      modes, from notification of availability to
                                                        automatic installation
                                                      - Enables customization of subscription parameters
                                                      and schedules
- --------------------------------------------------------------------------------------------------------
</TABLE>
 
     We generally license the Castanet Infrastructure Suite on a per user basis
with the total fee determined, in part, by the number of end-users who can
obtain updates using Castanet. The license terms also vary depending on the
number of applications to be deployed with Castanet and whether the computer
receiving updates is a server or client computer. Separate licenses are
available for the right to customize the user interface of the client component
of Castanet and to distribute the client and/or server components of the system
to customers, partners or others outside of the customer's own organization. The
Castanet Management and the Production Suites are generally licensed on a per
user basis, based on the number of individual systems administrators who will
use the components of the suites. We intend to license the Castanet Inventory
Suite in a manner similar to the Castanet Infrastructure Suite and we intend to
license the Castanet Subscription Suite in a manner similar to the Castanet
Management and Production Suites.
 
                                       36
<PAGE>   37
 
ARCHITECTURE
 
     The Castanet infrastructure is designed to distribute software and data
efficiently over networks based upon TCP/IP (Transmission Control
Protocol/Internet Protocol), the basic communication protocol of the Internet.
Castanet packages an application as a channel and publishes the application to a
transmitter, which then distributes the channel and subsequent updates across a
network to tuners on client computers. The fundamental components of the
architecture are illustrated below:   LOGO
 
     Channel. A channel is the application and/or related data that is
distributed using Castanet. For example, a channel could consist of a
stock-trading application written in Java or a shrink-wrapped application,
including Microsoft Word and related documents. Each channel has an associated
list of properties that describes its features, including application type,
author, copyright notice, update schedule and entry point. Castanet's
application packager prepares the channel for distribution and inserts a channel
adapter that installs and launches the application in a platform and application
specific manner. The application packager is designed to accommodate a range of
application types, including Java applets, Java Beans, Visual Basic, C, C++ and
shrink-wrapped applications. Using OSD (Open Software Description), a format for
describing the way software programs relate to one another, the application
packager creates a description of the installation process which is based on XML
(eXtensible Markup Language), a format commonly used on the Internet to describe
data and documents. Using this technology, both shrink-wrapped and custom
applications can be installed, updated and repaired without requiring changes to
the original application and without relying on the original application
installer. After the application is packaged as a channel, it is published to
the transmitter for distribution over the network.
 
     Transmitter. The transmitter is the server component of Castanet. It
distributes channels and subsequent updates to the tuner, the Castanet client.
The tuner and transmitter communicate using the Castanet protocol which is
designed to minimize bandwidth requirements for updates over HTTP (Hyper-Text
Transfer Protocol), the protocol used to distribute web pages. The Castanet
protocol uses compression technology that compresses data and applications, and
differential updating which identifies changes in code and updates only the
changed portion. All updates are transactional, interruptible and atomic, which
means that channels on the tuner are always in a functional state even if the
most recent update failed or was interrupted. In addition, interrupted downloads
can be restarted automatically at the point of interruption. Castanet provides
functionality to identify and verify each channel resource and installed
applications. Additional transmitter features include replication,
personalization, client feedback, bandwidth management and policy
administration. Castanet implements user authentication and
 
                                       37
<PAGE>   38
 
access control using passwords or client-side certificates and by leveraging
directory services, including LDAP (Lightweight Directory Access Protocol), or
Microsoft's Active Directory.
 
     Tuner. The tuner is the client component of Castanet. The tuner subscribes
to channels located on the transmitter and downloads, installs and receives
updates of each channel. Once received from a transmitter, channels are stored
locally on the tuner, making the downloaded channel resources instantly
accessible regardless of whether the user is connected to the network. The tuner
is typically configured to run in the background and can manage multiple
channels simultaneously without end-user interaction, updating them as necessary
to present the user with the most recent version. In addition, the tuner's user
interface can be customized to include the brand, logo and other look and feel
elements desired by the customer. The tuner provides a comprehensive set of
features for modem support, bandwidth management, security controls, certificate
management, update scheduling and support for corporate network security
mechanisms.
 
     The Castanet distribution architecture can be scaled rapidly to a large
number of end users using replication and caching technology. The illustration
below describes an example of how applications can be deployed globally to
multiple end users:
 
                                      LOGO
 
     Using the Castanet protocol, tuners can be redirected automatically to
additional transmitters, serving as repeaters, in order to reduce the load on
the main transmitter and to make more efficient use of available bandwidth. By
adding repeaters, it is possible to provide faster download times and to service
thousands of simultaneous downloads. Repeaters can be added and removed
dynamically without disrupting the overall service, allowing for a high level of
scalability, improved service quality and availability. In addition, the use of
a caching proxy server, which stores frequently accessed files on a local disk,
can improve the efficiency of downloads through corporate network security
barriers in an intranet or network into the enterprise.
 
     In addition to the basic Castanet components, a variety of Castanet
features are available for reporting downloads, staging updates, application
signing, resource planning, certificate management, license installation,
transmitter administration, tuner administration and deploying tuner updates.
All of these features are distributed as Castanet channels, and together with
the basic infrastructure compo-
 
                                       38
<PAGE>   39
 
nents, provide all the necessary functionality to distribute, manage and
maintain mission critical applications and services. Where appropriate, we
provide programming interfaces and software development kits for customized
extensions, allowing customers to tailor the Castanet solution to their specific
needs, or to embed the Castanet technology into existing applications.
 
TECHNOLOGY
 
     We believe that our investment in engineering has resulted in technology
that provides us with a strategic advantage. Castanet has been built from the
ground up to provide a robust Internet-based solution. Castanet provides a
lightweight, cross-platform and easy-to-deploy solution that helps solve complex
application deployment and management problems which we believe are not
addressed adequately by existing client-server distribution and management
tools.
 
     Castanet makes extensive use of a broad range of technologies, including
Java, TCP/IP, HTTP, LDAP, XML, SSL (Secure Socket Layer), a protocol for secure
transmissions over the Internet, and various digital security technologies. In
addition, we have worked with partners to submit several standards proposals to
the World Wide Web Consortium, including the OSD format jointly developed with
Microsoft and the DRP protocol (HTTP Distribution and Replication Protocol), a
protocol which efficiently distributes data on the Internet, jointly developed
with Netscape, Sun Microsystems, Novell, Inc. and @Home Network.
 
     The Castanet protocol is designed to distribute applications and data to
multiple intermittently connected endpoints. The protocol is layered on HTTP so
that it can be used from within most secure corporate intranets and networks by
tunneling through an HTTP proxy server. When the user is on line, the tuner
initiates update requests either when requested by the user or automatically
using a predefined update schedule. When an update request is received, the
transmitter quickly determines which files in the channel have changed, and if a
change has occurred, Castanet determines exactly which bytes within those files
have changed. The tuner then downloads the resulting changes, and compression
algorithms are used to further reduce the total download overhead. The
efficiency of the Castanet protocol makes it possible to distribute frequent
updates to large applications and application files with relatively low
bandwidth utilization. The protocol also provides features for user
authentication, personalization of content, the distribution of events and data
from the tuner to the transmitter and the automatic redirection of requests to
repeaters.
 
     Our OSD-based software installation technology provides a cross-platform
framework for installing, updating, and verifying applications in an operating
system specific manner. Applications are delivered with an OSD file that defines
the platforms on which the software runs, as well as the libraries and resources
it requires. In addition, the OSD file contains platform specific extensions
that define the exact installation requirements. For example, on the Microsoft
Windows platform, the OSD file describes exactly which files need to be
installed, which libraries that contain application code need to be updated,
which registry entries need to be set and which system scripts need to be
updated. Once an application is installed, the OSD file can be used to upgrade,
verify and uninstall the application. OSD files are generated automatically
using an installation capture technology, which eliminates the use of the
original application installer. Information technology managers can customize
the OSD script to control the level of user involvement in the resulting
installation.
 
     We have invested significant resources in developing Castanet's security
implementation. Castanet's security features currently include end user
authentication, digital certificates to verify application authenticity and SSL
communications to help protect the integrity and confidentiality of data
transmitted via Castanet. We offer a standard 40-bit encryption implementation
for international use and a 128-bit encryption implementation for domestic use
only. Our security implementation represents a combination of software written
by us and security code licensed to us by various vendors, including encryption
modules licensed from RSA Data Security and an SSL implementation from Netscape.
To
 
                                       39
<PAGE>   40
 
further enhance the breadth of our security offerings, we also recently licensed
a Java-based security implementation. We also have an arrangement with VeriSign
for the provision of digital certificates specifically for Castanet products.
See "Risk Factors -- We Rely on Third-Party Software and Applications."
 
     Most of our products are implemented using Sun Microsystems' Java
programming language. As a result, we believe that our products are extremely
portable, easy to internationalize, easily reconfigured and efficient. The use
of Java has proven to be a major advantage in developing portable components
without significantly increasing the engineering overhead as additional platform
support is required. We believe that our use of and expertise in Java provides
us a competitive advantage. See "Risk Factors -- We Rely on Third-Party Software
and Applications."
 
CUSTOMERS
 
     Our customer base spans multiple industry segments including financial
services, government, insurance, retail, manufacturing and telecommunications.
The following is a representative list of companies that have purchased over
$100,000 of Castanet products and services. We do not intend the identification
of these customers to imply that these customers are actively endorsing or
promoting our products.
 
American Management
 Systems
Arthur Andersen
Bear Stearns & Co.
Caterpillar
Charles Schwab
Cisco Systems
Daimler Chrysler
EarthLink Network
Edward Jones
Encanto Networks
Fireman's Fund
Ford Motor Company
Fujitsu
GE Medical Systems
Guardian Life Insurance
H&R Block
Hitachi IT
The Home Depot
Ingram Micro
Instinet
Intuit
Itochu
MECA Software
Merck & Co.
Mitchell International
Morgan Stanley Dean
 Witter & Co.
Samsung SDS
Seagate Technology
SegaSoft Networks
Sony Marketing
Sun Microsystems
SBC Warburg
 Dillon Read
The Thompson Financial
 Company
Toshiba
Wausau Insurance
 
     The following examples span intranet, extranet and Internet e-business
applications, and illustrate how organizations are relying on Castanet to
provide a management infrastructure for business-to-employee,
business-to-business, and business-to-customer networked communications and
transactions.
 
     Business-to-Employee (Intranet Applications). The Home Depot and Cytec
sought to lower cost of operations, automate application installation and
maintenance and improve controlled access to information within their intranet
environments. These organizations are utilizing Castanet to distribute, manage
and maintain critical line-of-business applications to their employees, whether
they reside in headquarter locations, remote offices or field locations. The
Home Depot selected Castanet to automate deployment of its custom design
applications to 760 stores worldwide. Cytec relies on Castanet to manage its
supply chain application accessed daily by hundreds of employees in North
America.
 
     Business-to-Business (Extranet Applications). Seagate Technology and Ingram
Micro rely on Castanet's built-in security, bandwidth efficiency,
personalization features and support for disconnected use for combined intranet
and extranet applications. Seagate Technology is utilizing Castanet to deliver
and update business applications, including sales forecasting and pricing
information to its internal sales management, mobile sales force and external
OEM and distributor partners. Ingram Micro is utilizing Castanet to deploy and
maintain electronic commerce services to its network of resellers.
 
     Business-to-Customer (Internet Applications). Intuit and OnSale were
challenged with providing Internet applications to a large number of end users
where bandwidth efficiency, cross platform support and incremental,
transactional updates are key. Intuit embedded Castanet into its Quicken 99
personal finance software to enable its installed base of 10.5 million online
users to receive software and information updates transparently. OnSale, a
leading Internet auction retailer with over one million
 
                                       40
<PAGE>   41
 
registered users, built its BidWatch application on Castanet's infrastructure in
order to collect and display real-time bid information for up to 1,000
simultaneously active users.
 
     Many of our customers have gained measurable cost saving benefits through
their deployment of Castanet. We engaged the Hurwitz Group, an industry analyst
and research firm, to work with us to assess the amount of time required for
Castanet to pay for itself, or achieve a break-even return on investment for
selected customers. The net payback period represents the total amount of
anticipated time needed for the organization to recoup its initial investment in
terms of monthly cost savings. The cost savings include both reductions in costs
that the customer has achieved or expects to achieve, as well as anticipated
costs that the customer expects to avoid, by deploying Castanet. These cost
saving data are based on data provided by the customers, and have not been
independently verified. The following examples demonstrate the expected payback
period for Castanet in three diverse customer deployments.
 
<TABLE>
<CAPTION>
 
- ------------------------------------------------------------------------------------------------------------
                        USE OF                          INITIAL   ESTIMATED MONTHLY             NET PAYBACK
CUSTOMER                CASTANET                     INVESTMENT   COST SAVINGS                    PERIOD
- ------------------------------------------------------------------------------------------------------------
<S>                     <C>                          <C>          <C>                          <C>
 Major                  Distribute and manage sales  $ 200,000    People savings:    $ 21,000    2 months
 Manufacturer           productivity applications                 Hardware savings:    $5,000
                        to its remote/mobile sales                Network bandwidth
                        force and channel partners.               utilization
                                                                  savings:  $121,800
                                                                  Total:                $147,800
- ------------------------------------------------------------------------------------------------------------
 Computer Equipment     Distribute all internal      $1,000,000   People savings:    $165,000    4 months
 Manufacturer           business applications to                  Hardware savings:  $122,000
                        employees connected to                    Total:                $287,000
                        worldwide corporate
                        network.
- ------------------------------------------------------------------------------------------------------------
 Major Retail           Distribute, update and       $2,000,000   People savings:    $ 86,000   12 months
 Corporation            manage Windows applications               Hardware savings:  $ 25,000
                        over T1 lines to global                   Support call
                        retail network.                           savings:  $ 60,000
                                                                  Total:                $171,000
- ------------------------------------------------------------------------------------------------------------
</TABLE>
 
SALES, MARKETING AND DISTRIBUTION
 
     We market our Castanet products worldwide through a combination of a direct
sales force, resellers and distributors. Our worldwide direct sales, marketing
and business development organizations consisted of 72 individuals as of March
31, 1999, 43 of whom were located at our Mountain View, California headquarters,
23 in regional offices located in California, Georgia, Illinois, Michigan, New
York and Texas and six in our European office in the United Kingdom.
 
     Our sales, marketing and distribution approaches are designed to help
customers understand both the business and technical benefits of the products.
We have built an experienced consulting services organization to facilitate the
successful deployment of our products. We intend to expand our consulting
services organization and direct sales force and to establish additional sales
offices domestically and internationally. Competition for sales personnel is
intense, and we may not be able to attract, assimilate or retain additional
qualified personnel in the future. See "Risk Factors -- We Need to Develop and
Expand Our Sales, Marketing and Distribution Capabilities."
 
     We conduct a variety of marketing programs worldwide to educate our target
market, create awareness and generate leads for our Castanet solutions. To
achieve these goals, we have engaged in marketing activities including
e-business seminars, direct mailings, print and online advertising campaigns and
trade shows. These programs are targeted at key information technology
executives as well as vice presidents of marketing and general managers of
business units. In addition, we conduct comprehensive public relations programs
that include establishing and maintaining relationships with key trade press,
business press and industry analysts as well as an active executive speakers'
bureau. We have established and enforced consistent branding guidelines for all
of our channel partners in order to solidify our market position. We have also
initiated a
 
                                       41
<PAGE>   42
 
customer advisory council which provides a communication channel for regular
feedback from key customers to facilitate the design of products that meet the
expanding requirements of our target market.
 
     Tivoli has been a reseller of our products since 1997. We also have an
original equipment manufacturer agreement with Tivoli under which Tivoli has
built upon the Castanet infrastructure to develop a product called Cross-Site,
which was released in April 1999. Any revenues from Tivoli under this original
equipment manufacturer agreement will be from per seat royalty payments on sales
of Cross-Site that contain the Castanet infrastructure. Because Cross-Site is a
new product, Tivoli might fail to successfully market and sell Cross-Site, and
the level of demand for Cross-Site is uncertain. Our reseller agreement with
Tivoli expires upon the earlier of June 30, 1999 or written notice provided to
us by Tivoli. For a more detailed description of the risks of our relationship
with Tivoli, see "Risk Factors -- We Depend on Our Relationship with Tivoli."
 
     Netscape, a reseller of our products, accounted for $1.0 million, or
approximately 18%, of our revenues in 1997, and $3.8 million, or approximately
22% of our revenues in 1998. A majority of the $3.8 million of 1998 revenues was
recognized in the first half of 1998, with only $1.3 million in revenues
recognized in the second half of 1998. Netscape is no longer an active reseller,
and we do not expect material revenues from Netscape in the future.
 
     Markets outside the United States are currently served by our direct sales
office in the United Kingdom as well as independent distributors and resellers
covering countries in Europe and Asia. Our distributors purchase our Castanet
products at discounts from end-user list prices. Sales under the agreements are
denominated in U.S. dollars. Foreign sales are subject to risks, including
exchange rate fluctuations, internal monetary conditions, tariffs, import
licenses, trade policies and domestic and foreign tax policies. For more
information on risks related to foreign sales see "Risk Factors -- Expanding
Internationally Is Expensive, We May Receive No Benefit from Our Expansion and
Our International Operations are Subject to Governmental Regulation."
 
     We may not be able to enter into agreements or establish relationships with
desired distribution partners on a timely basis, or at all, and our distribution
partners may not devote adequate resources to selling our products. For more
information on risks related to third-party distribution channels see "Risk
Factors -- We Need to Develop and Expand Our Sales, Marketing and Distribution
Capabilities."
 
CUSTOMER SUPPORT AND TRAINING
 
     Our customer support and training organization consisted of 15 employees as
of March 31, 1999. We offer a variety of customer support services to meet
specific needs including an option to purchase support on a per-question basis
or an annual subscription service that provides customers with the latest
product updates as they become available. In addition, we also offer the
following annual service packages:
 
     Bronze Service. This service provides customers with technical assistance
on installation and basic product questions via e-mail and/or telephone, as well
as access to our customer support engineers. With this service, customers also
receive the latest product updates as they become available.
 
     Silver Service. This program includes all the features of the Bronze
Service offering with the addition of coverage 24 hours a day, every day of the
week.
 
     Gold Service. Designed for mission-critical applications, the Gold Service
program provides customers with all the features of the Silver Service plus
early access to product beta releases and proactive support from designated
technical account managers.
 
     Customers that license our products typically engage our professional
services organization to assist with support, training and consulting. We
believe that growth in our product sales depends on our ability to provide our
customers with these services and to educate third-party resellers and
consultants on how
 
                                       42
<PAGE>   43
 
to provide similar services. As a result, we plan to increase the number of our
service personnel to meet these needs. Please see "Risk Factors -- We Need to
Expand Our Professional Services."
 
RESEARCH AND DEVELOPMENT
 
     As of March 31, 1999, our engineering organization was comprised of 51
employees responsible for product development, quality assurance, documentation,
localization and porting. Our development organization is divided into four
groups: infrastructure and production tools, management tools, applications and
advanced development.
 
     - The infrastructure and production tools group is focused on enhancing the
       functionality, reliability, performance and flexibility of our products
       and expanding the ability of Castanet to operate with leading operating
       systems.
 
     - Our management tools group is focused on developing enterprise-level
       products that address additional Internet services management functions
       to complement our current product family, and to expand our coverage of
       the Internet services management market. These products are being
       developed to add functionality to our existing product family by allowing
       customers to collect system and application inventory information,
       control subscription and configuration and monitor the status of
       endpoints.
 
     - The applications group focuses on developing solutions including document
       management to end users and bi-directional data management between remote
       offices and stores, to address specific enterprise problems that will
       directly benefit and leverage our product line.
 
     - Our advanced development group defines architecture and engages in
       speculative and forward-looking engineering with the intention that the
       results may become products in the future.
 
     These four development groups are supported by the quality assurance,
documentation, localization and porting groups. The quality assurance group
implements a process designed to identify software defects through the entire
development cycle. The documentation group is responsible for end user,
administrator and developer documentation for our products. The localization
group is responsible for internationalizing our products while in development as
well as performing the language-specific localization after the English version
is produced. The porting group is responsible for any changes to the source code
required to allow a product to run on platforms other than the two core
development platforms of Solaris and Windows.
 
     We believe that our software development team and core technologies
represent a significant competitive advantage. The software development team
includes a number of key members from the engineering team that developed the
Java programming language and Java virtual machines at Sun Microsystems.
 
     A technically skilled, quality oriented and highly productive development
organization will be a key component of the success of new product offerings. We
must attract and retain highly qualified employees to further our research and
development efforts. Our business and operating results could be seriously
harmed if we are not able to hire and retain the required number of individuals.
 
     Research and development expenses were $2.4 million in 1997 and $5.8
million in 1998. To date, substantially all software development costs have been
expensed as incurred and developed by our employees. We believe that significant
investments in research and development are required to remain competitive. As a
consequence, we intend to continue to increase the absolute amount of our
research and development expenditures in the future. For more information on our
research and development expenses, see 'Management's Discussion and Analysis of
Financial Condition and Results of Operations."
 
                                       43
<PAGE>   44
 
     We cannot be sure that existing and future development efforts will be
completed within our anticipated schedules or that they will have the features
to make them successful. Future delays or problems in the development of product
enhancements or new products could seriously harm our business and operating
results. Furthermore, despite our testing and testing by our customers, errors
might be found in our products, which we are unable to successfully correct in a
timely and cost-effective manner. If we are not able to develop new products,
enhancements to existing products or correct errors on a timely and
cost-effective basis, or if these new products or enhancements do not have the
features necessary to make them successful, our business and operating results
will be seriously harmed. Furthermore, we currently license externally developed
technology and will continue to evaluate externally developed technologies for
integration into our product lines. See "Risk Factors -- Our Success Depends on
Our Castanet Product Family and New Product Development," "-- Software Defects
in Castanet Would Harm Our Business" and "-- We Must Respond to Rapid
Technological Change and Evolving Industry Standards."
 
COMPETITION
 
     The market for Internet services management solutions is new, intensely
competitive and rapidly evolving. We expect competition to continue to increase
both from existing competitors and new market entrants. We believe that our
ability to compete depends on many factors both within and beyond our control,
including:
 
     - the ease of use, performance, features, price and reliability of our
       solutions as compared to those of our competitors;
 
     - the timing and market acceptance of new solutions and enhancements to
       existing solutions developed by us and our competitors;
 
     - the quality of our customer service; and
 
     - the effectiveness of our sales and marketing efforts.
 
     We encounter current or potential competition from a number of different
sources, including sellers of enterprise-wide management systems, which include
electronic software distribution, including Tivoli, Computer Associates and BMC
Software; companies such as BackWeb, Novadigm, and Sterling Commerce, through
its subsidiary XcelleNet, which market products that support the distribution of
software applications; and desktop software management suites, such as
Microsoft's SMS and Intel's LanDesk.
 
     In addition, we compete with various methods of application distribution
and management, including the web browser, and with application server vendors
and others which have introduced software distribution capabilities into their
products.
 
     Some of our competitors have longer operating histories and significantly
greater financial, technical, marketing and other resources than we do. Many of
these companies have broader customer relationships that could be leveraged,
including relationships with many of our customers. These companies also have
more established customer support and professional services organizations than
we do. In addition, these companies may adopt aggressive pricing policies. As a
result, we may not be able to maintain a competitive position against current or
future competitors.
 
     As new participants enter the Internet services management market, we will
face increased competition. Potential competitors may bundle their products or
incorporate an Internet services management component into existing products in
a manner that discourages users from purchasing our products. Furthermore, it is
possible that new competitors or alliances among competitors may emerge and
rapidly acquire significant market share. Our competitors may be able to respond
more quickly to new or emerging technologies and changes in customer
requirements than we can.
 
                                       44
<PAGE>   45
 
PROPRIETARY RIGHTS AND LICENSING
 
     Our success and ability to compete are dependent on our ability to develop
and maintain the proprietary aspects of our technology. We rely on a combination
of patent, trademark, trade secret, and copyright law and contractual
restrictions to protect the proprietary aspects of our technology. We presently
have three U.S. patent applications, and several trademark registrations and
applications in the United States and some foreign countries. Our patent and
trademark applications might not result in the issuance of any valid patents or
trademarks. We seek to protect our source code for our software, documentation
and other written materials under trade secret and copyright laws. We license
our software under signed license agreements, which impose restrictions on the
licensee's ability to utilize the software. Finally, we seek to avoid disclosure
of our intellectual property by requiring employees and consultants with access
to our proprietary information to execute confidentiality agreements with us and
by restricting access to our source code.
 
     Despite our efforts to protect our proprietary rights, unauthorized parties
may attempt to copy aspects of our products or to obtain and use information
that we regard as proprietary. In addition, we sell our products
internationally. The laws of many countries do not protect our proprietary
rights to as great an extent as do the laws of the United States. Litigation may
be necessary in the future to enforce our intellectual property rights, to
protect our trade secrets, and to determine the validity and scope of the
proprietary rights of others. Any resulting litigation could result in
substantial costs and diversion of resources and could have a material adverse
effect on our business and operating results.
 
     Our success and ability to compete are also dependent on our ability to
operate without infringing upon the proprietary rights of others. In the event
of a successful claim of infringement against us and our failure or inability to
license the infringed technology, our business and operating results would be
significantly harmed. Currently, we are engaged in litigation with Novadigm
concerning the alleged infringement by us of a patent held by Novadigm which is
described in detail in this section under "Legal Proceedings."
 
LEGAL PROCEEDINGS
 
     On March 3, 1997, Novadigm filed a complaint against us in the United
States District Court for the Northern District of California, alleging
infringement by us of a patent held by Novadigm (U.S. Patent No. 5,581,764, the
"Novadigm Patent"). Novadigm alleges that our infringement relates to specific
methods for updating data and software over a computer network that we use in
our Castanet products. Novadigm later identified claims 1, 4, 5, 23, 24, 25, 31,
33 and 34 of the Novadigm Patent as being infringed. In its complaint, Novadigm
requests preliminary and permanent injunctions prohibiting us and other
specified persons from making, using or selling any infringing products, and
claims damages, costs and attorneys' fees. The complaint also alleges that we
have willfully infringed the Novadigm Patent and seeks up to triple damages
under the United States Patent Act.
 
     On May 2, 1997, we filed our answer to Novadigm's complaint and filed a
counterclaim against Novadigm. Our answer denies Novadigm's allegations and
asserts defenses to Novadigm's claim. Our counterclaim seeks a declaratory
judgment that we do not infringe the Novadigm Patent and that the Novadigm
Patent is invalid and unenforceable. On October 3, 1997, we received an opinion
from outside patent opinion counsel, Blakely, Sokoloff, Taylor & Zafman, LLP,
that Castanet 1.0 did not infringe the Novadigm Patent. Blakely, Sokoloff,
Taylor & Zafman, LLP does not serve as our patent litigation counsel in this
lawsuit and has not advised us since October 3, 1997. Since then, we have
released three new major versions of Castanet. Although we do not believe that
any changes to Castanet made in the newer versions cause Castanet to infringe
any claim of the Novadigm Patent, the opinion of Blakely, Sokoloff, Taylor &
Zafman, LLP did not address the three new versions of Castanet that we have
released since October 3, 1997.
 
                                       45
<PAGE>   46
 
     On August 25, 1997 and January 26, 1998, we filed motions for summary
adjudication asking the court to rule that one of the relevant claims of the
Novadigm Patent is invalid because it was anticipated by two prior art
references. In response to each motion, Novadigm argued that the motion was
premature because it pre-dated the court's claim construction proceedings,
because only limited discovery had been taken, and because our motion failed to
demonstrate that we were entitled to summary adjudication. The court denied our
motions in part because (1) discovery was ongoing, (2) the court had not had an
opportunity to construe the relevant language in the Novadigm Patent and (3) the
court found there were triable issues of fact as to the disclosures in those
references. The court stated that we could re-file our motions once discovery
has been substantially completed and after it had held a claims construction
hearing.
 
     On December 17, 1998, the court held a claims construction hearing on the
appropriate interpretation of particular terms in the Novadigm Patent, and on
December 28, 1998, the court issued an order defining those terms.
 
     On January 19, 1999, Novadigm detailed its position as to why Castanet
Version 1.1 infringes the asserted claims of the Novadigm Patent and contended
that the alleged comparison of file level and channel level checksums in
non-optimized updating and the comparison of channel level checksums and their
associated update commands in optimized updating infringes the claims of the
Novadigm Patent. Novadigm's claim is not limited to Version 1.1, and Novadigm
has also stated that it believes that all or some code from subsequent versions
of Castanet work substantially the same way. We do not believe that Novadigm
accurately states the functionality of Castanet Version 1.1 or establishes that
Castanet Version 1.1 infringes the Novadigm Patent. We also do not believe that
the relevant portions of other versions of Castanet work in substantially the
same way or infringe on any claim of the Novadigm Patent. However, it is
possible that Novadigm may allege additional ways in which Castanet infringes
claims of the Novadigm Patent in the future.
 
     To date, both parties have conducted substantial discovery. We expect that
in the first half of 1999, the parties will complete discovery, including the
exchange of expert reports. If the court does not enter judgment based on any
dispositive motions, a jury trial of this action is currently scheduled to begin
in September 1999.
 
     We believe that we have strong defenses against Novadigm's lawsuit.
Accordingly, we intend to defend this suit vigorously. However, we may not
prevail in this litigation. Litigation is subject to inherent uncertainties,
especially in cases such as this where sophisticated factual issues must be
assessed and complex technical issues must be decided. In addition, cases
similar to this involve issues of law that are evolving, presenting further
uncertainty. Our defense of this litigation, regardless of the merits of the
complaint, has been, and will likely continue to be, time-consuming, costly and
a diversion for our technical and management personnel. In addition, publicity
related to this litigation has in the past, and will likely in the future, have
a negative impact on the sale of our Castanet products.
 
     A failure to prevail in the litigation could result in:
 
     - our paying monetary damages, which could be tripled if the infringement
       is found to have been willful, and which may include paying an ongoing
       royalty to Novadigm for the sales of Castanet products or paying lost
       profits to Novadigm for particular sales in which we competed with
       Novadigm and closed a sale;
 
     - the issuance of a preliminary or permanent injunction requiring us to
       stop selling Castanet in its current form;
 
     - our having to redesign Castanet, which could be costly and time consuming
       and could substantially delay Castanet shipments, assuming that a
       redesign is feasible;
 
     - our having to reimburse Novadigm for some or all of its attorneys' fees;
 
                                       46
<PAGE>   47
 
     - our having to obtain from Novadigm a license to its patent, which license
       might not be made available to us on reasonable terms, particularly
       because Novadigm is a competitor; or
 
     - our having to indemnify our customers against any losses they may incur
       due to the alleged infringement.
 
     Any of these results would seriously harm our business and operating
results. Furthermore, we expect to continue to incur substantial costs in
defending against this litigation and these costs could increase significantly
if our dispute goes to trial. It is possible that these costs could
substantially exceed our expectations in future periods.
 
     EMPLOYEES
 
     At March 31, 1999, we had a total of 162 employees, 156 of whom were based
in the United States and 6 of whom were based in the United Kingdom. Of the
total, 51 were in research and development, 72 were engaged in sales, marketing
and business development, 15 were engaged in customer support and training, and
24 were in administration and finance. None of our employees is subject to a
collective bargaining agreement and we believe that our relations with our
employees are good.
 
     FACILITIES
 
     Our principal administrative, sales, marketing, and research and
development facility occupies approximately 47,500 square feet in Mountain View,
California under a lease which expires in April 2000. We also have regional
offices located in California, Georgia, Illinois, Michigan, New York and Texas
and a European office in the United Kingdom. We believe that our existing
facilities are adequate for our current needs and that suitable additional or
alternative space will be available in the future on commercially reasonable
terms as needed.
 
                                       47
<PAGE>   48
 
                                   MANAGEMENT
 
EXECUTIVE OFFICERS, KEY EMPLOYEES AND DIRECTORS
 
     Our executive officers, key employees and directors, and their ages as of
April 1, 1999, are as follows:
 
<TABLE>
<CAPTION>
            NAME              AGE                         POSITION
            ----              ---                         --------
<S>                           <C>   <C>
Kim K. Polese...............  37    President, Chief Executive Officer and Director
Arthur A. van Hoff..........  36    Chief Technology Officer and Director
Steven P. Williams..........  36    Executive Vice President, Worldwide Sales and
                                      Chief Operating Officer
Fred M. Gerson..............  48    Vice President, Finance and Chief Financial Officer
Thomas E. Banahan...........  40    Vice President, Business Development
Robert E. Currie............  31    Vice President, Engineering
Jacqueline Ross.............  41    Vice President, Marketing
Jonathan Payne..............  34    Senior Engineer
Sami Shaio..................  35    Senior Engineer
Aneel Bhusri................  33    Director
Raymond J. Lane.............  52    Director
Douglas J. Mackenzie........  39    Director
Stratton D. Sclavos.........  37    Director
</TABLE>
 
- ---------------
     Kim K. Polese, a founder of Marimba, has served as president, chief
executive officer and a director of Marimba since our inception in February
1996. Before co-founding Marimba, Ms. Polese served in several marketing
positions at Sun Microsystems, an enterprise networking company, from January
1989 until January 1996, most recently as senior product manager. From January
1986 to December 1988, Ms. Polese was a technical support engineer for
Intellicorp, Inc., an expert systems software company. Ms. Polese received her
B.A. in Biophysics from the University of California at Berkeley.
 
     Arthur A. van Hoff, a founder of Marimba, has served as chief technology
officer and a director of Marimba since our inception in February 1996. Before
co-founding Marimba, from February 1993 until February 1996, Mr. van Hoff held
various engineering positions at Sun Microsystems, most recently as senior staff
engineer. Mr. van Hoff received his M. Phil. in Computer Science from
Strathclyde University in Glasgow, Scotland and a postgraduate degree in
Computer Science from Hogere Informatica Opleiding in Enschede, Holland.
 
     Steven P. Williams has served as Marimba's executive vice president,
worldwide sales and chief operating officer since April 1999 and as our vice
president, worldwide sales since November 1996. Before joining Marimba, Mr.
Williams served as vice president, western sales from March 1996 to November
1996 and before that as director, western sales from March 1992 to March 1996,
for Tivoli, a systems management software company. Mr. Williams received his
B.S. in Electrical Engineering from California Polytechnic State University, San
Luis Obispo.
 
     Fred M. Gerson has served as Marimba's vice president, finance and chief
financial officer since October 1997. Before joining Marimba, Mr. Gerson served
as vice president and chief financial officer for Maxis, Inc., a consumer
entertainment software company, from November 1994 to October 1997, and from
November 1992 to November 1994, he served as vice president and chief financial
Officer of Farallon Computing, Inc. (currently Netopia, Inc.), a communications
software and hardware company. Mr. Gerson received his B.A. in Economics from
City University of New York-Brooklyn College and his M.B.A. from New York
University.
 
                                       48
<PAGE>   49
 
     Thomas E. Banahan has served as Marimba's vice president, business
development since December 1996. Mr. Banahan was vice president, worldwide sales
of Spyglass, Inc., an Internet software and service provider, from August 1994
to November 1996, and from March 1988 to July 1994, he was a vice president of
sales of Comdisco, Inc., a technology services company. Mr. Banahan received his
B.A. in Business Economics from the University of California, Santa Barbara.
 
     Robert E. Currie has served as Marimba's vice president, engineering since
August 1996. From December 1988 to January 1995, Mr. Currie held various
engineering positions at Digidesign, Inc., a digital audio technology company
(currently a division of Avid Technology), most recently as vice president,
software engineering. Mr. Currie received his B.S. in Electrical Engineering and
Computer Science from the University of California at Berkeley.
 
     Jacqueline Ross has served as Marimba's vice president, marketing since
August 1998. From June 1996 to July 1998, Ms. Ross served as vice president,
marketing for Check Point Software Technologies, Ltd., a provider of secure
enterprise networking solutions. From January 1995 to May 1996, Ms. Ross was
vice president, marketing of Cambio Networks Inc., an enterprise management
software company, and before that served as the director of field marketing at
Hughes LAN Systems, a hardware vendor, from July 1991 to December 1994. Ms. Ross
received her B.A. and B.B.A. from Kent State University and her M.B.A. from
Stanford University.
 
     Jonathan Payne, a founder of Marimba, has served as a senior engineer for
Marimba since our inception in February 1996. Before co-founding Marimba, Mr.
Payne was a senior engineer at Starwave Corporation, an Internet services
company, from February 1995 to February 1996. From June 1988 until February
1995, Mr. Payne served in various engineering positions at Sun Microsystems. Mr.
Payne received his B.A. in Cognitive Science from the University of Rochester.
 
     Sami Shaio, a founder of Marimba, has served as a Senior Engineer of
Marimba since our inception in February 1996. Before co-founding Marimba, from
May 1989 until February 1996, Mr. Shaio held various engineering positions at
Sun Microsystems, most recently as senior staff engineer. Mr. Shaio received his
A.B. and A.M. in Linguistics, as well as his B.S. in Computer Science, from
Stanford University. Mr. Shaio received his M.S. in Computer Science from the
University of Michigan.
 
     Aneel Bhusri has served as a director of Marimba since February 1999. Mr.
Bhusri has been a general partner at Greylock Management Corporation, a national
venture capital firm, since April 1999. Mr. Bhusri has served as the vice
chairman of PeopleSoft since March 1999. Before his current position at
PeopleSoft, Mr. Bhusri served as the senior vice president of product strategy,
business development and marketing for PeopleSoft, an enterprise software
company from April 1997 to March 1999. Before this position at PeopleSoft, Mr.
Bhusri served as senior vice president of product strategy from November 1995 to
April 1997. From April 1995 to November 1995, Mr. Bhusri served as vice
president of product strategy and from August 1993 to April 1995 as director of
product strategy. Before joining PeopleSoft, Mr. Bhusri was an associate at
Norwest Venture Capital from June 1992 to March 1993. From 1988 to 1991, he was
a financial analyst in Morgan Stanley's Corporate Finance Department. Mr. Bhusri
received his B.S. in Electrical Engineering and his B.A. in Economics from Brown
University, and his M.B.A. from Stanford University.
 
     Raymond J. Lane has served as a director of Marimba since October 1997. Mr.
Lane has been the president and chief operating officer of Oracle Corporation, a
database software company, since January 1997. Before his position as president
and chief operating officer, Mr. Lane served as the executive vice president of
worldwide operations for Oracle from October 1993 to January 1997, and has been
a director of Oracle since June 1995. Mr. Lane served as a senior vice president
of Oracle USA from June 1992 to October 1993. Before joining Oracle, Mr. Lane
served as senior vice president and managing partner of the Worldwide
Information Technology Group at Booz, Allen & Hamilton, a management consulting
firm, from July 1986 to May 1992. He served on the Booz, Allen & Hamilton
Executive Committee and
 
                                       49
<PAGE>   50
 
its Board of Directors from April 1987 to May 1992. Mr. Lane is also a member of
the Board of Trustees of Carnegie Mellon University. Mr. Lane received his B.S.
in Math from West Virginia University.
 
     Douglas J. Mackenzie has served as a director of Marimba since August 1996.
Since June 1989, Mr. Mackenzie has been employed with Kleiner Perkins Caufield &
Byers, a venture capital firm, of which he has been a general partner since
1994. Before joining Kleiner Perkins, Mr. Mackenzie held senior level sales,
marketing, and operations positions in Eczel Corporation, a reseller of
microcomputer products, from October 1983 to August 1987. From March 1982 to
October 1983, Mr. Mackenzie served as a management consultant at Booz, Allen &
Hamilton. Mr. Mackenzie serves as a director of Visio Corporation, a business
drawing and diagramming software company, as well as several private
technology-based companies. Mr. Mackenzie received his A.B. in Economics and his
M.S. in Industrial Engineering from Stanford University and his M.B.A. from
Harvard University.
 
     Stratton D. Sclavos has served as a director of Marimba since February
1999. Mr. Sclavos has been the president, chief executive officer and a director
of VeriSign since he joined VeriSign in July 1995. From October 1993 to June
1995, Mr. Sclavos was vice president, worldwide marketing and sales of Taligent,
Inc., a software development company that was a joint venture among Apple
Computer, Inc., IBM and Hewlett-Packard. From May 1992 to September 1993, Mr.
Sclavos was vice president of worldwide sales and business development of GO
Corporation, a pen-based computer company. Mr. Sclavos is also a director and a
member of the compensation committee of Network Solutions, Inc. Mr. Sclavos
received his B.S. degree in Electrical and Computer Engineering from the
University of California, Davis.
 
BOARD COMMITTEES
 
     The board of directors has a compensation committee and an audit committee.
 
     Compensation Committee. The compensation committee of the board of
directors reviews and makes recommendations to the board regarding all forms of
compensation provided to the executive officers and directors of Marimba and our
subsidiary including stock compensation and loans. In addition, the compensation
committee reviews and makes recommendations on bonus and stock compensation
arrangements for all of our employees. As part of these responsibilities the
compensation committee also administers our 1996 Stock Plan, 1999 Omnibus Equity
Incentive Plan and 1999 employee stock purchase plan. The current members of the
compensation committee are Messrs. Lane and Mackenzie.
 
     Audit Committee. The audit committee of the board of directors reviews and
monitors our corporate financial reporting and our internal and external audits,
including our internal audit and control functions, the results and scope of the
annual audit and other services provided by our independent auditors and our
compliance with legal matters that have a significant impact on our financial
reports. The audit committee also consults with management and our independent
auditors before the presentation of financial statements to stockholders and, as
appropriate, initiates inquiries into aspects of our financial affairs. In
addition, the audit committee has the responsibility to consider and recommend
the appointment of, and to review fee arrangements with, our independent
auditors. The current members of the audit committee are Messrs. Bhusri,
Mackenzie and Sclavos.
 
DIRECTOR COMPENSATION
 
     Most directors who are not our employees have received grants of options to
purchase shares of our common stock. Upon and following this offering,
non-employee directors will receive automatic option grants under our 1999
Non-Employee Directors Option Plan.
 
                                       50
<PAGE>   51
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     The compensation committee of the board of directors currently consists of
Messrs. Lane and Mackenzie. No interlocking relationship exists between any
member of our board of directors or our compensation committee and any member of
the board of directors or compensation committee of any other company, and no
interlocking relationship has existed in the past.
 
INDEMNIFICATION
 
     Our Third Amended and Restated Certificate of Incorporation, to be
effective after the closing of this offering, includes a provision that
eliminates the personal liability of our directors and officers for monetary
damages for breach of fiduciary duty as a director or officer, except for
liability:
 
     - for any breach of the director's or officer's duty of loyalty to us or
       our stockholders;
 
     - for acts or omissions not in good faith or that involve intentional
       misconduct or a knowing violation of law;
 
     - under Section 174 of the Delaware General Corporation Law regarding
       unlawful dividends and stock purchases; or
 
     - for any transaction from which the director or officer derived an
       improper personal benefit.
 
These provisions are permitted under Delaware law.
 
     Our bylaws provide that:
 
     - we must indemnify our directors and officers to the fullest extent
       permitted by Delaware law, subject to very limited exceptions;
 
     - we may indemnify our other employees and agents to the same extent that
       we indemnified our officers and directors; and
 
     - we must advance expenses, as incurred, to our directors and officers in
       connection with a legal proceeding to the fullest extent permitted by
       Delaware law, subject to very limited exceptions.
 
     We have also entered into indemnification agreements with our officers and
directors containing provisions that may require us to indemnify our officers
and directors against liabilities that may arise by reason of their status or
service as directors or officers, other than liabilities arising from willful
misconduct of a culpable nature, to advance their expenses incurred as a result
of any proceeding against them as to which they could be indemnified, and to
obtain directors' and officers' insurance if available on reasonable terms.
 
                                       51
<PAGE>   52
 
EXECUTIVE COMPENSATION
 
     The following table presents compensation information for 1998 paid by us
for services by our chief executive officer and our four other highest-paid
executive officers whose total salary and bonus for the fiscal year exceeded
$100,000:
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                   LONG-TERM
                                                                  COMPENSATION
                                                                  ------------
                                                                     AWARDS
                                                                  ------------
                                           ANNUAL COMPENSATION     SECURITIES
                                           --------------------    UNDERLYING       ALL OTHER
       NAME AND PRINCIPAL POSITION         SALARY($)   BONUS($)    OPTIONS(#)    COMPENSATION($)
       ---------------------------         ---------   --------   ------------   ---------------
<S>                                        <C>         <C>        <C>            <C>
Kim K. Polese............................  $130,000          --          --          $  930(1)
  President and Chief Executive Officer
Steven P. Williams(2)....................   125,000    $125,000      50,000           2,000(3)
  Executive Vice President, Worldwide
  Sales and Chief Operating Officer
Thomas E. Banahan........................   125,000     100,000          --              --
  Vice President, Business Development
Robert E. Currie.........................   137,000          --      70,000              --
  Vice President, Engineering
Fred M. Gerson...........................   165,000          --          --              --
  Vice President, Finance and
  Chief Financial Officer
</TABLE>
 
- -------------------------
(1) Represents premiums paid by us for term life insurance.
 
(2) Mr. Williams was our Vice President, Worldwide Sales during 1998.
 
(3) Represents amounts paid by us for auto allowance.
 
     The following table designates each grant of stock options during 1998 to
our chief executive officer and our four other highest-paid executive officers.
No stock appreciation rights were granted to these individuals during 1998.
 
     The figures representing percentages of total options granted to employees
in the last fiscal year are based on a total of 2,017,800 option shares granted
to our employees under our 1996 Stock Plan during 1998.
 
     The exercise price of each option granted is equal to the fair market value
of our common stock as valued by our board of directors on the date of grant.
The exercise price may be paid in cash, in shares of our common stock valued at
fair market value on the exercise date or through a cashless exercise procedure
involving a same-day sale of the purchased shares. We may also finance the
option exercise by lending the optionee sufficient funds to pay the exercise
price for the purchased shares.
 
     The potential realizable value is calculated based on the ten-year term of
the option at the time of grant. Stock price appreciation of 5% and 10% is
assumed according to rules promulgated by the Securities and Exchange Commission
and does not represent our prediction of our stock price performance. The
potential realizable value at 5% and 10% appreciation is calculated by assuming
that the exercise price on the date of grant appreciates at the indicated rate
for the entire term of the option and that the option is exercised at the
exercise price and sold on the last day of its term at the appreciated price.
 
                                       52
<PAGE>   53
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                INDIVIDUAL GRANTS                     POTENTIAL REALIZABLE
                              -----------------------------------------------------     VALUE AT ASSUMED
                              NUMBER OF                                                  ANNUAL RATES OF
                              SECURITIES                                                   STOCK PRICE
                              UNDERLYING     % OF TOTAL                                 APPRECIATION FOR
                               OPTIONS     OPTIONS GRANTED   EXERCISE                      OPTION TERM
                               GRANTED      TO EMPLOYEES       PRICE     EXPIRATION   ---------------------
            NAME                (#)(1)     IN FISCAL YEAR     ($/SH)        DATE         5%          10%
            ----              ----------   ---------------   ---------   ----------   ---------   ---------
<S>                           <C>          <C>               <C>         <C>          <C>         <C>
Kim K. Polese...............        --            --              --            --          --          --
Steven P. Williams..........    50,000           2.5%          $8.50      12/17/08    $267,280    $677,341
Thomas E. Banahan...........        --            --              --            --          --          --
Robert E. Currie............    50,000           2.5            3.00      08/27/08      94,334     239,061
                                20,000           1.0            1.00      01/06/08      12,578      31,875
Fred M. Gerson..............        --            --              --            --          --          --
</TABLE>
 
- -------------------------
(1) Each of the options listed in the table is immediately exercisable. The
    shares purchased under the options may be repurchased by us at the original
    exercise price paid per share if the optionee ceases service with us before
    vesting in these shares. For Mr. Currie's option covering 50,000 shares and
    Mr. Williams' option covering 50,000 shares, the repurchase right lapses and
    25% of the option shares vest upon completion of 12 months of service from
    the vesting start date, and the balance of the option shares vests in a
    series of equal monthly installments over the next three years of service.
    For Mr. Currie's option covering 20,000 shares, the repurchase right lapses
    and 33 1/3% of the option shares vest upon completion of 12 months of
    service from the vesting start date, and the balance of the option shares
    vests in a series of equal monthly installments over the next two years of
    service. The option shares will fully vest if Marimba is acquired in a
    merger or asset sale, unless our repurchase right with respect to the
    unvested option shares is transferred to the acquiring entity. Each of the
    options has a ten-year term, but the term may end earlier if the optionee
    ceases service with Marimba.
 
     The following table presents for our chief executive officer and our four
other highest-paid executive officers the number and value of securities
underlying unexercised options that are held by these executive officers as of
December 31, 1998. No options or stock appreciation rights were exercised by
these executive officers in 1998, and no stock appreciation rights were
outstanding at the end of that year.
 
     Each of the options listed in the table is immediately exercisable. The
shares purchased under the options may be repurchased by us at the original
exercise price paid per share if the optionee ceases service with us before
vesting in these shares. The heading Vested refers to shares that are no longer
subject to our repurchase right; the heading Unvested refers to shares subject
to our repurchase right as of December 31, 1998.
 
     The figures in the "value of unexercised in-the-money options at fiscal
year end" column are based on the fair market value of our common stock at the
end of 1998 of $8.50 per share, less the exercise price payable for these
shares.
 
                                       53
<PAGE>   54
 
                         FISCAL YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                                                      NUMBER OF
                                                SECURITIES UNDERLYING            VALUE OF
                                                 UNEXERCISED OPTIONS           UNEXERCISED
                                                    AT FISCAL YEAR         IN-THE-MONEY OPTIONS
                                                        END(#)            AT FISCAL YEAR END($)
                                                ----------------------    ----------------------
                     NAME                        VESTED      UNVESTED      VESTED      UNVESTED
                     ----                       --------    ----------    ---------    ---------
<S>                                             <C>         <C>           <C>          <C>
Kim K. Polese.................................       --           --            --           --
Steven P. Williams............................   19,444       80,556      $155,552     $244,448
Thomas E. Banahan.............................       --           --            --           --
Robert E. Currie..............................    6,667       63,333        50,003      374,998
Fred M. Gerson................................       --           --            --           --
</TABLE>
 
- -------------------------
EMPLOYEE BENEFIT PLANS
 
     1999 OMNIBUS EQUITY INCENTIVE PLAN
 
     Our 1999 Omnibus Equity Incentive Plan was adopted by our board of
directors on February 2, 1999. We will also seek stockholder approval of this
plan. We have reserved 1,250,000 shares of our common stock for issuance under
the 1999 Omnibus Equity Incentive Plan. As of January 1 of each year, starting
in 2000, the number of shares reserved for issuance under our 1999 Omnibus
Equity Incentive Plan will be increased automatically by 4% of the total number
of shares of common stock then outstanding or, if less, 1,250,000 shares. No
options have yet been granted under the 1999 Omnibus Equity Incentive Plan.
 
     Under the 1999 Omnibus Equity Incentive Plan, the individuals eligible to
receive awards are:
 
     - employees;
 
     - non-employee members of the board of directors; and
 
     - consultants.
 
     The types of awards that may be made under the 1999 Omnibus Equity
Incentive Plan are:
 
     - options to purchase shares of common stock;
 
     - stock appreciation rights;
 
     - restricted shares; and
 
     - stock units.
 
     Options may be incentive stock options that qualify for favorable tax
treatment for the optionee under Section 422 of the Internal Revenue Code of
1986 or nonstatutory stock options not designed to qualify for favorable tax
treatment. With limited restrictions, if shares awarded under the 1999 Omnibus
Equity Incentive Plan are forfeited, those shares will again become available
for new awards under the 1999 Omnibus Equity Incentive Plan.
 
     The compensation committee of our board of directors administers the 1999
Omnibus Equity Incentive Plan. The committee has complete discretion to make all
decisions relating to the interpretation and operation of our 1999 Omnibus
Equity Incentive Plan. The committee has the discretion to determine which
eligible individuals are to receive any award, and to determine the type,
number, vesting requirements and other features and conditions of each award.
 
     The exercise price for incentive stock options granted under the 1999
Omnibus Equity Incentive Plan may not be less than 100% of the fair market value
of our common stock on the option grant date. The exercise price for
non-statutory options granted under the 1999 Omnibus Equity Incentive Plan may
not be less than 85% of the fair market value of our common stock on the option
grant date.
 
     Our 1999 Omnibus Equity Incentive Plan provides that no participant may
receive options or stock appreciation rights covering more than 100,000 shares
in the same year, except that a newly hired
 
                                       54
<PAGE>   55
 
employee may receive options or stock appreciation rights covering up to 300,000
shares in the first year of employment.
 
     The exercise price may be paid with:
 
     - cash;
 
     - outstanding shares of common stock;
 
     - the cashless exercise method through a designated broker;
 
     - a pledge of shares to a broker; or
 
     - a promissory note.
 
     The purchase price for newly issued restricted shares awarded under the
1999 Omnibus Equity Incentive Plan may be paid with:
 
     - cash;
 
     - a promissory note; or
 
     - the rendering of past services.
 
     The committee may reprice options and may modify, extend or assume
outstanding options and stock appreciation rights. The committee may accept the
cancellation of outstanding options or stock appreciation rights in return for
the grant of new options or stock appreciation rights. The new option or right
may have the same or a different number of shares and the same or a different
exercise price.
 
     If a change in control of Marimba occurs, an option or other award under
the 1999 Omnibus Equity Incentive Plan will become fully exercisable and fully
vested if the option or award is not assumed by the surviving corporation or its
parent or if the surviving corporation or its parent does not substitute
comparable awards for the awards granted under the 1999 Omnibus Equity Incentive
Plan.
 
     A change in control includes:
 
     - a merger or consolidation of Marimba after which our then-current
       stockholders own less than 50% of the surviving corporation;
 
     - a sale of all or substantially all of our assets;
 
     - a proxy contest that results in replacement of more than one-half of our
       directors over a 24-month period; or
 
     - an acquisition of 50% or more of our outstanding stock by a person other
       than a person related to Marimba, including a corporation owned by our
       stockholders.
 
     If a merger or other reorganization occurs, the agreement of merger or
reorganization may provide that outstanding options and other awards under the
1999 Omnibus Equity Incentive Plan shall be assumed by the surviving corporation
or its parent, shall be continued by Marimba if it is the surviving corporation,
shall have accelerated vesting and then expire early, or shall be cancelled for
a cash payment.
 
     Our board of directors may amend or terminate the 1999 Omnibus Equity
Incentive Plan at any time. If our board amends the plan, stockholder approval
of the amendment will be sought only if required by an applicable law. The 1999
Omnibus Equity Incentive Plan will continue in effect indefinitely unless the
board decides to terminate the plan earlier.
 
     1999 EMPLOYEE STOCK PURCHASE PLAN
 
     Our board of directors adopted our employee stock purchase plan on February
2, 1999. We will also seek stockholder approval of this plan. We have reserved
500,000 shares of our common stock for issuance under our 1999 employee stock
purchase plan. As of January 1 each year, starting in 2000, the number of shares
reserved for issuance under our 1999 employee stock purchase plan will be
increased
 
                                       55
<PAGE>   56
 
automatically by 2% of the total number of shares of common stock then
outstanding or, if less, 500,000 shares. Our 1999 employee stock purchase plan
is intended to qualify under Section 423 of the Internal Revenue Code.
 
     Eligible employees may begin participating in the 1999 employee stock
purchase plan at the start of an offering period. Each offering period lasts 24
months. Two overlapping offering periods will start on May 1 and November 1 of
each calendar year. However, the first offering period will start on the
effective date of this offering and end on April 30, 2001. Purchases of our
common stock will occur on April 30 and October 31 of each calendar year during
an offering period.
 
     Our 1999 employee stock purchase plan will be administered by the
compensation committee of our board of directors. Each of our employees is
eligible to participate if he is employed by us for more than 20 hours per week
and for more than five months per year.
 
     Our 1999 employee stock purchase plan permits each eligible employee to
purchase common stock through payroll deductions. Each employee's payroll
deductions may not exceed 10% of the employee's cash compensation. The initial
period during which payroll deductions may be contributed will begin on the
effective date of this offering and end on October 31, 1999. Each participant
may purchase up to 500 shares on any purchase date.
 
     The price of each share of common stock purchased under our 1999 employee
stock purchase plan will be 85% of the lower of:
 
     - the fair market value per share of our common stock on the date
       immediately before the first date of the applicable offering period; or
 
     - the fair market value per share of our common stock on the purchase date.
 
     In the case of the first offering period, the price per share under the
plan will be 85% of the lower of:
 
     - the price offered to the public in this offering; or
 
     - the fair market value per share of our common stock on the purchase date.
 
     Employees may end their participation in the 1999 employee stock purchase
plan at any time. Participation ends automatically upon termination of
employment with Marimba.
 
     If a change in control of Marimba occurs, our 1999 employee stock purchase
plan will end, and shares will be purchased with the payroll deductions
accumulated to date by participating employees, unless this plan is assumed by
the surviving corporation or its parent. Our board of directors may amend or
terminate the 1999 employee stock purchase plan at any time. If our board of
directors increases the number of shares of common stock reserved for issuance
under the 1999 employee stock purchase plan, it must seek the approval of our
stockholders.
 
     1999 NON-EMPLOYEE DIRECTORS OPTION PLAN
 
     Our board of directors adopted our 1999 Non-Employee Directors Option Plan
on February 2, 1999. We will also seek stockholder approval of this plan. Only
the non-employee members of our board of directors will be eligible for
automatic option grants under this plan.
 
     We have reserved 150,000 shares of our common stock for issuance under our
1999 Non-Employee Directors Option Plan. As of January 1 each year, starting in
2000, the number of shares reserved for issuance under our 1999 Non-Employee
Directors Option Plan will be increased automatically to restore the total
number of shares available under this plan to 150,000 shares. No shares have yet
been issued under our 1999 Non-Employee Directors Option Plan.
 
     The compensation committee of our board of directors will make any
administrative determinations under our 1999 Non-Employee Directors Option Plan.
No discretionary decisions will be made by the compensation committee under this
plan.
 
                                       56
<PAGE>   57
 
     The exercise price for options granted under our 1999 Non-Employee
Directors Option Plan may be paid in cash or in outstanding shares of our common
stock. Options may also be exercised on a cashless basis through the same-day
sale of the purchased shares.
 
     Each individual who became a member of our board of directors as a
non-employee director before 1999 will receive a fully vested option for 7,500
shares of our common stock on the effective date of this offering. The exercise
price of this option will be the initial price offered to the public in this
offering.
 
     Each individual who first joins our board of directors as a non-employee
director after the effective date of this offering will receive at that time a
fully vested option for 15,000 shares of our common stock. In addition, at each
of our annual stockholders meetings, beginning in 2000, each non-employee
director who will continue to be a director after that meeting will
automatically be granted at that meeting a fully vested option for 7,500 shares
of our common stock. However, any non-employee director who receives an option
for 15,000 shares under this plan will first become eligible to receive the
annual option for 7,500 shares at the annual meeting that occurs at any time
during the year that is two calendar years after the year in which he received
the option for 15,000 shares. For example, if a director received the option for
15,000 shares at any time in 1999, the director will first become eligible to
receive the option for 7,500 shares at the annual stockholders meeting occurring
in 2001. The exercise price of each option will be equal to the fair market
value of our common stock on the option grant date.
 
     Our board of directors may amend or modify the 1999 Non-Employee Directors
Option Plan at any time. The 1999 Non-Employee Directors Option Plan will
terminate on February 1, 2009, unless our board of directors decides to
terminate the plan sooner.
 
CHANGE OF CONTROL ARRANGEMENTS
 
     We granted to Mr. Gerson options to purchase an aggregate of 300,000 shares
of our common stock at an exercise price of $.50 per share. The first option for
250,000 shares vested as to one-third of the shares subject to the option on the
first anniversary of Mr. Gerson's employment start date and the remainder vests
in equal monthly installments for twenty-four months. The second option for
50,000 shares vests in equal monthly installments for thirty-six months
commencing November 3, 1998.
 
     If there is a merger or asset sale of Marimba after the first twelve months
of Mr. Gerson's employment and Mr. Gerson is constructively terminated within
twelve months of the merger or asset sale, Mr. Gerson will vest in 50% of the
remaining unvested shares subject to both options. Following the acceleration of
both options, the remaining unvested shares subject to these options will vest
in accordance with the original vesting schedules, as if the remaining shares
were the only shares subject to the options.
 
     All options and other awards granted under our 1996 Stock Plan and our 1999
Omnibus Equity Incentive Plan, including options granted to our executive
officers, will become fully vested if a change in control of Marimba occurs,
unless the options or awards are assumed by the surviving corporation or its
parent or if the surviving corporation or its parent substitutes comparable
options or awards for options or awards granted under our plans.
 
                                       57
<PAGE>   58
 
                           RELATED PARTY TRANSACTIONS
 
     Since our incorporation in February 1996, we have issued and sold
securities to the following persons who are our executive officers, directors or
principal stockholders. The per share purchase price for our Series A preferred
stock was $1.4824 and the per share purchase price for our Series B preferred
stock was $5.0072. For more detail on shares held by these purchasers see
"Principal and Selling Stockholders."
 
<TABLE>
<CAPTION>
                                                             SERIES A    SERIES B
                                                             PREFERRED   PREFERRED    COMMON
                         INVESTOR                              STOCK       STOCK       STOCK
                         --------                            ---------   ---------   ---------
<S>                                                          <C>         <C>         <C>
Kim K. Polese(1)...........................................         --         --    2,500,000
Arthur A. van Hoff(1)......................................         --         --    2,500,000
Steven P. Williams.........................................     67,458         --      316,000
Thomas E. Banahan..........................................         --         --      316,000
Robert E. Currie...........................................         --         --      300,000
Fred M. Gerson.............................................         --         --      300,000
Jonathan Payne(1)..........................................         --         --    2,500,000
Sami Shaio(1)..............................................         --         --    2,500,000
Raymond J. Lane............................................         --     19,971           --
Kleiner Perkins Caufield & Byers(2)........................  2,698,412    199,712           --
</TABLE>
 
- -------------------------
(1) Each of Kim K. Polese, Arthur A. van Hoff, Jonathan Payne and Sami Shaio,
    our founders, entered into a Restricted Common Stock Purchase Agreement,
    dated February 21, 1996, with us. The per share purchase price for these
    shares of common stock was $.001.
 
(2) Kleiner Perkins Caufield & Byers includes the following entities managed by
    Kleiner Perkins: KPCB Java Fund, L.P., KPCB Information Sciences Zaibatsu
    Fund II, L.P., Kleiner Perkins Caufield & Byers VIII, L.P and KPCB VIII
    Founders Fund, L.P. Douglas J. Mackenzie, a director of Marimba, is a
    general partner of Kleiner Perkins.
 
     In addition, we have granted options to some of our executive officers. See
"Management -- Executive Compensation."
 
SERIES A FINANCING
 
     On August 8, 1996, we issued an aggregate of 2,698,412 shares of Series A
preferred stock at a per share purchase price of $1.4824 to three investors,
each of which is an entity affiliated with Kleiner Perkins, one of our principal
stockholders. Douglas J. Mackenzie, a member of our board of directors, is a
general partner of Kleiner Perkins. On January 28, 1997, we issued 67,458 shares
of Series A preferred stock at a per share purchase price of $1.4824 to Steven
P. Williams, our executive vice president, worldwide sales and chief operating
officer.
 
SERIES B FINANCING
 
     On August 25 and 28, 1997, we issued an aggregate of 2,895,829 shares of
Series B preferred stock at a per share purchase price of $5.0072 to ten
investors, including entities affiliated with Kleiner Perkins. On September 23,
October 23 and November 21, 1997, we issued an aggregate of 71,896 shares of
Series B preferred stock at a per share purchase price of $5.0072 to four
investors. On October 7, 1997, we issued 19,971 shares of Series B preferred
stock at a per share purchase price of $5.0072 to Raymond J. Lane, a member of
our board of directors.
 
                                       58
<PAGE>   59
 
LOANS FROM DIRECTORS AND EXECUTIVE OFFICERS
 
     Each of our founders, Kim K. Polese, Arthur A. van Hoff, Jonathan Payne,
and Sami Shaio, provided a short-term loan to us in return for a promissory
note, dated March 7, 1996, issued to each founder. Each note was in the
principal sum of $12,500 and accrued simple interest at the rate of 5.32% per
year. In addition, Mr. Shaio loaned an additional $14,000 to us in return for a
promissory note, dated July 17, 1996, which accrued simple interest at the rate
of 5.32% per year. We repaid each of these loans in August 1996.
 
LOAN TO EXECUTIVE OFFICER
 
     On November 11, 1997, we loaned $149,970 to Fred M. Gerson, secured by a
stock pledge agreement, in connection with his purchase of 300,000 shares of our
common stock. This note accrued interest at the rate of 5.69% per year. The
principal balance of this note and accrued interest was paid in full in January
1999. See "Executive Compensation -- Change of Control Arrangements."
 
STOCK OPTION GRANTS TO DIRECTORS
 
     On September 18, 1997, we granted to Raymond J. Lane an option to purchase
75,000 shares of common stock at a per share exercise price of $.50 under our
1996 Stock Plan. Mr. Lane's option is subject to three-year vesting, in which he
becomes vested in 33 1/3% of the option shares upon completion of 12 months of
service and in the balance of the option shares in a series of equal monthly
installments upon the completion of each of the next 24 months of service. On
February 2, 1999, we granted to each of Aneel Bhusri and Stratton D. Sclavos an
option to purchase 20,000 shares of common stock at a per share exercise price
of $10.00 under our 1996 Stock Plan. Messrs. Bhusri's and Sclavos' options were
fully vested upon grant.
 
INDEMNIFICATION
 
     We have entered into an indemnification agreement with each of our officers
and directors. See "Management -- Indemnification" for a description of the
indemnification available to our officers and directors under our Third Amended
and Restated Certificate of Incorporation, to be effective after the closing of
this offering and our bylaws.
                            ------------------------
 
     We believe that the transactions above were made on terms no less favorable
to us than could have been obtained from unaffiliated third parties. All future
transactions, including loans between us and our officers, directors, principal
stockholders and their affiliates will be approved by a majority of the board of
directors, including a majority of the independent and disinterested outside
directors on the board of directors, and will continue to be on terms no less
favorable to us than could be obtained from unaffiliated third parties.
 
                                       59
<PAGE>   60
 
                       PRINCIPAL AND SELLING STOCKHOLDERS
 
     The following table presents selected information regarding beneficial
ownership of our outstanding common stock as of March 31, 1999 and as adjusted
to reflect the sale of the common stock being sold in this offering for: (1)
each of our directors, our chief executive officer and our four other
highest-paid executive officers; (2) all of our directors and executive officers
as a group; and (3) each other person known by us to own beneficially more than
5% of our common stock.
 
     Beneficial ownership is determined in accordance with the rules of the
Securities and Exchange Commission and generally includes voting or investment
power with respect to securities. Common stock subject to options exercisable
within 60 days of March 31, 1999 are deemed outstanding for purposes of
computing the percentage ownership of the person holding the option but are not
deemed outstanding for purposes of computing the percentage ownership of any
other person. Except where indicated, and subject to community property laws
where applicable, we believe that the persons in the table below have sole
voting and investment power with respect to all common stock shown as
beneficially owned by them. Unless otherwise indicated, the address of each
holder of more than 5% of our common stock listed in the table is c/o Marimba,
Inc., 440 Clyde Ave., Mountain View, CA 94043.
 
<TABLE>
<CAPTION>
                                              SHARES BENEFICIALLY             SHARES BENEFICIALLY
                                                     OWNED                           OWNED
                                              BEFORE THE OFFERING   SHARES    AFTER THE OFFERING
            NAME AND ADDRESS OF               -------------------    BEING    -------------------
              BENEFICIAL OWNER                 NUMBER     PERCENT   OFFERED    NUMBER     PERCENT
            -------------------               ---------   -------   -------   ---------   -------
<S>                                           <C>         <C>       <C>       <C>         <C>
Kim K. Polese...............................  2,486,072    12.9%    124,300   2,361,772    10.4%
Steven P. Williams(1)(2)....................    483,458     2.5          --     483,458     2.1
Thomas E. Banahan...........................    316,000     1.6          --     316,000     1.4
Robert E. Currie(1).........................    370,000     1.9          --     370,000     1.6
Fred M. Gerson(3)...........................    300,000     1.6          --     300,000     1.3
Arthur A. van Hoff..........................  2,480,000    12.9     124,000   2,356,000    10.4
Aneel Bhusri(1).............................     20,000     0.1          --      20,000     .09
Raymond J. Lane(1)..........................     94,971     0.5          --      94,971     .42
Douglas J. Mackenzie(4).....................  2,898,124    15.1          --   2,898,124    12.7
  c/o Kleiner Perkins Caufield & Byers 2750
  Sand Hill Road Menlo Park, CA 94025
Stratton D. Sclavos(1)......................     20,000     0.1          --      20,000     .09
OTHER 5% STOCKHOLDERS
Jonathan Payne(5)...........................  2,476,000    12.9     123,700   2,352,300    10.3
Sami Shaio..................................  2,439,200    12.7      80,000   2,359,200    10.4
Entities affiliated with Kleiner Perkins
  Caufield & Byers..........................  2,898,124    15.1          --   2,898,124    12.7
  2750 Sand Hill Road Menlo Park, CA 94025
All directors and executive officers as a
  group (11 persons)(6).....................  9,768,625    49.4     248,300   9,520,325    40.8
</TABLE>
 
                                       60
<PAGE>   61
 
- -------------------------
 
(1) The following table indicates those people whose total number of
    beneficially owned shares include shares subject to options exercisable
    within 60 days of March 31, 1999:
 
<TABLE>
<CAPTION>
                                                                  Shares Subject to Options
                                                                  -------------------------
    <S>                                                           <C>
    Robert E. Currie............................................            70,000
    Steven P. Williams..........................................           100,000
    Aneel Bhusri................................................            20,000
    Raymond J. Lane.............................................            75,000
    Stratton D. Sclavos.........................................            20,000
</TABLE>
 
(2) Includes 1,500 shares held as custodian for Zachary P. Williams and 1,500
    shares held as custodian for Natalia J. Williams.
 
(3) Includes 5,000 shares held as custodian for Stacey B. Gerson and 5,000
    shares held as custodian for Hilary I. Gerson. Mr. Gerson disclaims
    beneficial ownership of these shares.
 
(4) Represents 1,988,745, 72,453, 76,131 and 760,795 shares of common stock held
    of record by KPCB Java Fund, L.P., KPCB Information Sciences Zaibatsu Fund
    II, L.P., KPCB VIII Founders Fund, L.P., and Kleiner Perkins Caufield &
    Byers VIII, L.P. Mr. Mackenzie, a director of Marimba, is a general partner
    of Kleiner Perkins. Mr. Mackenzie disclaims beneficial ownership of shares
    held by Kleiner Perkins except to the extent of his pecuniary interest
    arising from his interest in Kleiner Perkins.
 
(5) Includes 1,538 shares held as custodian for Madeline M. Payne.
 
(6) Includes 585,000 shares subject to options which are exercisable within 60
    days of March 31, 1999, 5,000 shares held by Mr. Gerson as custodian for
    Stacey B. Gerson and 5,000 shares held as custodian for Hilary I. Gerson,
    and 1,500 shares held by Mr. Williams as custodian for Zachary P. Williams
    and 1,500 shares held as custodian for Natalia J. Williams.
 
     If the underwriters' over-allotment option is exercised, up to an
additional 412,000 shares may be sold by selling stockholders as follows: Kim K.
Polese 124,300; Arthur A. van Hoff 124,000; Jonathan Payne 123,700; and Sami
Shaio 40,000.
 
     On April 19, 1999, our board of directors granted to the following
executive officers options to purchase shares of our common stock at an exercise
price per share of $15.00: Mr. Williams received an option to purchase 300,000
shares; Mr. Currie received an option to purchase 100,000 shares and Mr. Gerson
received an option to purchase 50,000 shares.
 
                                       61
<PAGE>   62
 
                          DESCRIPTION OF CAPITAL STOCK
 
     Our authorized capital stock consists of 80,000,000 shares of common stock,
and 10,000,000 shares of undesignated preferred stock, after giving effect to
the amendment of our Second Amended and Restated Certificate of Incorporation to
delete references to Series A preferred stock and Series B preferred stock
following conversion of our preferred stock into common stock upon the closing
of this offering.
 
     The following is a summary description of our capital stock. Our bylaws and
our Third Amended and Restated Certificate of Incorporation, to be effective
after the closing of this offering, provide further information about our
capital stock.
 
COMMON STOCK
 
     As of March 31, 1999, there were 13,444,209 shares of common stock
outstanding that were held of record by approximately 187 stockholders. There
will be 22,745,775 shares of common stock outstanding, assuming no exercise of
the underwriters' over-allotment option and assuming no exercise after March 31,
1999 of outstanding options, after giving effect to the sale of the shares of
common stock to the public offered in this prospectus and the conversion of our
preferred stock into common stock at a one-to-one ratio.
 
     The holders of common stock are entitled to one vote per share on all
matters to be voted upon by the stockholders. Holders of common stock do not
have cumulative voting rights, and, therefore, holders of the remaining shares
voting for the election of directors can elect all of the directors. Subject to
preferences that may be applicable to any outstanding preferred stock, the
holders of common stock are entitled to receive dividends, if any, as may be
declared from time to time by the board of directors out of funds legally
available. See "Dividend Policy." In the event of the liquidation, dissolution
or winding up of Marimba, the holders of common stock are entitled to share
ratably in all assets remaining after payment of liabilities, subject to prior
distribution rights of preferred stock, if any, then outstanding. The common
stock has no preemptive or conversion rights or other subscription rights. There
are no redemption or sinking fund provisions applicable to the common stock. All
outstanding shares of common stock are fully paid and nonassessable, and the
shares of common stock to be issued upon completion of this offering will be
fully paid and nonassessable.
 
PREFERRED STOCK
 
     Upon filing our Third Amended and Restated Certificate of Incorporation
after the closing of this offering, we will authorize 10,000,000 shares of
preferred stock. The board of directors has the authority to issue the preferred
stock in one or more series and to fix the rights, preferences, privileges and
related restrictions, including dividend rights, dividend rates, conversion
rights, voting rights, terms of redemption, redemption prices, liquidation
preferences and the number of shares constituting any series or the designation
of the series, without further vote or action by the stockholders. The issuance
of preferred stock may have the effect of delaying, deferring or preventing a
change in control of us without further action by the stockholders and may
adversely affect the voting and other rights of the holders of common stock. The
issuance of preferred stock with voting and conversion rights may adversely
affect the voting power of the holders of common stock, including the loss of
voting control to others. At present, we have no plans to issue any of our
preferred stock.
 
WARRANTS
 
     Immediately following the closing of this offering, there will be an
outstanding warrant to purchase a total of 16,865 shares of common stock at
$1.48 per share. This warrant expires on January 31, 2004.
 
                                       62
<PAGE>   63
 
ANTI-TAKEOVER EFFECTS OF PROVISIONS OF THE CERTIFICATE OF INCORPORATION, BYLAWS
AND DELAWARE LAW
 
     CERTIFICATE OF INCORPORATION AND BYLAWS
 
     Upon filing after the closing of this offering, our Third Amended and
Restated Certificate of Incorporation will provide that, all stockholder actions
must be effected at a duly called meeting and not by a consent in writing. The
bylaws provide that, except as otherwise required by law or by our Third Amended
and Restated Certificate of Incorporation, special meetings of the stockholders
can only be called by a resolution adopted by a majority of the board of
directors, or by the president or at the request of stockholders holding at
least 30% of our capital stock. These provisions of our Third Amended and
Restated Certificate of Incorporation and bylaws could discourage potential
acquisition proposals and could delay or prevent a change in control. These
provisions are intended to enhance the likelihood of continuity and stability in
the composition of the board of directors and in the policies formulated by the
board of directors and to discourage transactions that may involve an actual or
threatened change of control. These provisions are designed to reduce our
vulnerability to an unsolicited acquisition proposal. The provisions also are
intended to discourage tactics that may be used in proxy fights. However, these
provisions could have the effect of discouraging others from making tender
offers for our shares and, as a consequence, they also may inhibit fluctuations
in the market price of our shares that could result from actual or rumored
takeover attempts. These provisions also may have the effect of preventing
changes in our management.
 
     DELAWARE TAKEOVER STATUTE
 
     We are subject to Section 203 of the Delaware General Corporation Law,
which, subject to limited exceptions, prohibits a Delaware corporation from
engaging in any business combination with any interested stockholder for a
period of three years following the date that the stockholder became an
interested stockholder, unless:
 
     - before this date, the board of directors of the corporation approved
       either the business combination or the transaction that resulted in the
       stockholder becoming an interested stockholder;
 
     - upon consummation of the transaction that resulted in the stockholder
       becoming an interested stockholder, the interested stockholder owned at
       least 85% of the voting stock of the corporation outstanding at the time
       the transaction commenced, excluding for purposes of determining the
       number of shares outstanding those shares owned by persons who are
       directors and officers and by employee stock plans in which employee
       participants do not have the right to determine confidentially whether
       shares held subject to the plan will be tendered in a tender or exchange
       offer; or
 
     - on or after this date, the business combination is approved by the board
       of directors and authorized at an annual or special meeting of
       stockholders, and not by written consent, by the affirmative vote of at
       least 66 2/3% of the outstanding voting stock that is not owned by the
       interested stockholder.
 
     Section 203 defines business combination to include:
 
     - any merger or consolidation involving the corporation and the interested
       stockholder;
 
     - any sale, transfer, pledge or other disposition of 10% or more of the
       assets of the corporation involving the interested stockholder;
 
     - subject to limited exceptions, any transaction that results in the
       issuance or transfer by the corporation of any stock of the corporation
       to the interested stockholder;
 
                                       63
<PAGE>   64
 
     - any transaction involving the corporation that has the effect of
       increasing the proportionate share of the stock of any class or series of
       the corporation beneficially owned by the interested stockholder; or
 
     - the receipt by the interested stockholder of the benefit of any loans,
       advances, guarantees, pledges or other financial benefits provided by or
       through the corporation.
 
     In general, Section 203 defines an interested stockholder as any entity or
person beneficially owning 15% or more of the outstanding voting stock of the
corporation and any entity or person affiliated with or controlling or
controlled by this entity or person.
 
REGISTRATION RIGHTS
 
     After this offering, the holders of 15,181,300 shares of common stock will
be entitled to rights with respect to the registration of these shares under the
Securities Act. Under the terms of the agreement between us and the holders of
these registrable securities, if we propose to register any of our securities
under the Securities Act, either for our own account or for the account of other
security holders exercising registration rights, these holders are entitled to
notice of registration and are entitled to include their shares of common stock
in the registration. Holders of 5,753,566 shares of the registrable securities
are also entitled to specified demand registration rights under which they may
require us to file a registration statement under the Securities Act at our
expense with respect to our shares of common stock, and we are required to use
our best efforts to effect this registration. Further, the holders of these
demand rights may require us to file additional registration statements on Form
S-3. All of these registration rights are subject to conditions and limitations,
among them the right of the underwriters of an offering to limit the number of
shares included in the registration and our right not to effect a requested
registration within six months following the initial offering of our securities,
including this offering.
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for our common stock is U.S. Stock
Transfer Corporation.
 
                                       64
<PAGE>   65
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
     Upon completion of this offering, we will have 22,745,775 shares of common
stock outstanding, assuming no exercise of options after March 31, 1999. Of
these shares, the 4,000,000 shares sold in this offering will be freely tradable
without restriction or further registration under the Securities Act, except
that any shares held by persons that directly or indirectly control, or are
controlled by, or are under common control with us, may generally only be sold
in compliance with the limitations of Rule 144 described below.
 
SALES OF RESTRICTED SHARES
 
     The remaining 18,745,775 shares of common stock are deemed restricted
shares under Rule 144. The number of shares of common stock available for sale
in the public market is limited by restrictions under the Securities Act and
lock-up agreements under which the holders of the shares have agreed not to sell
or dispose of any of their shares for a period of 180 days after the date of
this prospectus without the prior written consent of Morgan Stanley & Co.
Incorporated. On the date of this prospectus, no shares other than the 4,000,000
shares being sold in this offering will be eligible for sale. Beginning 180 days
after the date of this prospectus, or earlier with the consent of Morgan Stanley
& Co. Incorporated, 18,745,775 restricted shares will become available for sale
in the public market subject to the limitations of Rule 144 of the Securities
Act.
 
     In general, under Rule 144 of the Securities Act as currently in effect,
beginning 90 days after this offering, a person, or persons whose shares are
aggregated, who has beneficially owned restricted shares for at least one year,
including a person who may be deemed an affiliate, is entitled to sell within
any three-month period a number of shares of common stock that does not exceed
the greater of 1% of the then-outstanding shares of our common stock,
approximately 227,458 shares after giving effect to this offering, and the
average weekly trading volume of our common stock on the Nasdaq National Market
during the four calendar weeks preceding this sale. Sales under Rule 144 of the
Securities Act are subject to restrictions relating to manner of sale, notice
and the availability of current public information about us. A person who is not
our affiliate at any time during the 90 days preceding a sale, and who has
beneficially owned shares for at least two years, would be entitled to sell
these shares immediately following this offering without regard to the volume
limitations, manner of sale provisions or notice or other requirements of Rule
144 of the Securities Act. However, the transfer agent may require an opinion of
counsel that a proposed sale of shares comes within the terms of Rule 144 of the
Securities Act before effecting a transfer of these shares.
 
     Before this offering, there has been no public market for our common stock
and no predictions can be made of the effect, if any, that the sale or
availability for sale of shares of additional common stock will have on the
market price of our common stock. Nevertheless, sales of substantial amounts of
these shares in the public market, or the perception that these sales could
occur, could adversely affect the market price of the common stock and could
impair our future ability to raise capital through an offering of our equity
securities.
 
OPTIONS
 
     As of March 31, 1999, options to purchase a total of 1,943,065 shares of
common stock under the 1996 Stock Plan were outstanding and exercisable. All of
the shares subject to options are subject to lock-up agreements. See "Lock-up
Agreements." An additional 1,087,329 shares of common stock were available as of
March 31, 1999 for future option grants or direct issuances under the 1996 Stock
Plan. However, as of the date of this offering, our 1996 Stock Plan terminates
and no future options will be granted under this plan. In addition, in February,
1999, 1,250,000 shares were reserved for issuance under our 1999 Omnibus Equity
Incentive Plan, 500,000 shares were reserved for issuance under our 1999
employee stock purchase plan and 150,000 shares were reserved for issuance under
our 1999 Non-
 
                                       65
<PAGE>   66
 
Employee Directors Option Plan. See "Management -- Employee Benefit
Plans -- 1999 Omnibus Equity Incentive Plan," "-- 1999 employee stock purchase
plan," and "-- 1999 Non-Employee Directors Option Plan" and Notes 6 and 9 of
Notes to Consolidated Financial Statements.
 
     Rule 701 under the Securities Act provides that shares of common stock
acquired on the exercise of outstanding options may be resold by persons other
than our affiliates, beginning 90 days after the date of this prospectus,
subject only to the manner of sale provisions of Rule 144, and by affiliates,
beginning 90 days after the date of this prospectus, subject to all provisions
of Rule 144 except its one-year minimum holding period. We intend to file one or
more registration statements on Form S-8 under the Securities Act to register
all shares of common stock subject to outstanding stock options and common stock
issued or issuable under our 1996 Stock Plan. We expect to file the registration
statement covering shares offered under the 1996 Stock Plan and the 1999
employee stock purchase plan and 1999 Omnibus Equity Incentive Plan
approximately 30 days after the closing of this offering. These registration
statements are expected to become effective upon filing. Shares covered by these
registration statements will then be eligible for sale in the public markets,
subject to the lock-up agreements, if applicable.
 
                                       66
<PAGE>   67
 
                                  UNDERWRITERS
 
     Under the terms and subject to conditions contained in an underwriting
agreement, the underwriters named below, for whom Morgan Stanley & Co.
Incorporated, Credit Suisse First Boston Corporation, BT Alex. Brown
Incorporated and Hambrecht & Quist LLC are acting as representatives, have
severally agreed to purchase, and Marimba and the selling stockholders have
agreed to sell to the underwriters, severally, the respective number of shares
of our common stock indicated opposite the names of the underwriters below:
 
<TABLE>
<CAPTION>
                                                               NUMBER
                            NAME                              OF SHARES
                            ----                              ---------
<S>                                                           <C>
Morgan Stanley & Co. Incorporated...........................  1,440,000
Credit Suisse First Boston Corporation......................    640,000
BT Alex. Brown Incorporated.................................    560,000
Hambrecht & Quist LLC.......................................    560,000
Bear, Stearns & Co. Inc. ...................................    100,000
Dain Rauscher Wessels.......................................    100,000
Edward D. Jones & Co., L.P. ................................    100,000
Legg Mason Wood Walker, Incorporated........................    100,000
SoundView Technology Group, Inc. ...........................    100,000
U.S. Bancorp Piper Jaffray Inc. ............................    100,000
Warburg Dillon Read LLC.....................................    100,000
Wasserstein Perella Securities, Inc. .......................    100,000
                                                              ---------
          Total.............................................  4,000,000
                                                              =========
</TABLE>
 
     The underwriters and the representatives are collectively referred to as
the underwriters and the representatives. The underwriters are offering the
shares of common stock subject to their acceptance of the shares from Marimba
and the selling stockholders and subject to prior sale. The underwriting
agreement provides that the obligations of the several underwriters to pay for
and accept delivery of the shares of our common stock offered by us in this
offering are subject to the approval of legal matters by their counsel. The
underwriters are obligated to take and pay for all of the shares of common stock
offered by us in this offering, other than those covered by the over-allotment
option described below, if any of those shares are taken.
 
     The underwriters initially propose to offer part of the shares of common
stock directly to the public at the public offering price on the cover page of
the prospectus and part to selected dealers at a price that represents a
concession not in excess of $.87 per share under the public offering price. Any
underwriter may allow, and these dealers may reallow, a concession not in excess
of $.10 per share to other underwriters or to some dealers. After the initial
offering of the shares of common stock, the offering price and other selling
terms may from time to time be varied by the representatives.
 
     Marimba and the selling stockholders have granted to the underwriters an
option, exercisable for 30 days from the date of this prospectus, to purchase up
to an aggregate of 600,000 additional shares of common stock at the public
offering price on the cover page of the prospectus, less underwriting discounts
and commissions. The underwriters may exercise this option solely for the
purpose of covering over-allotments, if any, made in connection with the
offering of the shares of common stock being offered. To the extent the option
is exercised, each underwriter will become obligated, subject to limited
conditions, to purchase approximately the same percentage of these additional
shares of common stock as the number next to the underwriter's name in the
preceding table bears to the total number of shares of common stock next to the
names of all underwriters in the preceding table. If the underwriters' option is
exercised in full, the total price to the public for this offering would be
$92,000,000, the total
 
                                       67
<PAGE>   68
 
underwriters' discounts and commissions would be $6,440,000, the total proceeds
to Marimba would be $69,489,600 and the total proceeds to the selling
stockholders would be $16,070,400.
 
     The underwriters have informed Marimba that each principal underwriter in
this offering may, subject to the approval of Morgan Stanley & Co. Incorporated,
sell to discretionary accounts over which the principal underwriter exercises
discretionary authority. The underwriters have further informed Marimba that
they estimate that these sales will not exceed in the aggregate five percent of
the total number of shares of common stock offered by them.
 
     Marimba's common stock has been approved for quotation on the Nasdaq
National Market under the symbol "MRBA."
 
     At the request of Marimba, the underwriters will reserve up to 260,000
shares of common stock to be offered for sale, at the initial public offering
price, to directors, officers, employees, business associates and related
persons of Marimba. The number of shares of common stock available for sale to
the general public will be reduced to the extent these persons purchase the
reserved shares. Any reserved shares which are not so purchased will be offered
by the underwriters to the general public on the same basis as the other shares
being offered.
 
     Marimba, our selling stockholders, directors, executive officers, and
substantially all of our other stockholders and optionholders have each agreed
that, without the prior written consent of Morgan Stanley & Co. Incorporated on
behalf of the underwriters, he will not, during the period ending 180 days after
the date of this prospectus:
 
     - offer, pledge, sell, contract to sell, sell any option or contract to
       purchase, purchase any option or contract to sell, grant any option,
       right or warrant to purchase, lend or transfer or dispose of, directly or
       indirectly, any shares of common stock; or any securities convertible
       into or exercisable or exchangeable for common stock; or
 
     - enter into any swap or similar arrangement that transfers to another, in
       whole or in part, any of the economic consequences of ownership of the
       common stock;
 
whether any transaction described above is to be settled by delivery of common
stock or other securities, in cash or by alternative payment.
 
     The restrictions described in the previous paragraph do not apply to:
 
     - the sale of shares to the underwriters;
 
     - the issuance by Marimba of shares of common stock upon the exercise of an
       option or a warrant or the conversion of a security outstanding on the
       date of this prospectus of which the underwriters have been advised in
       writing;
 
     - transactions by any person other than Marimba relating to shares of
       common stock or other securities acquired in open market transactions
       after the completion of the offering of the shares;
 
     - the granting of stock options under the existing Marimba employee benefit
       plans, provided that these options do not become exercisable and do not
       vest during this 180-day period; or
 
     - gifts, distributions or transfers to trusts, provided that transferees in
       transactions described in this clause enter into lock-up agreements
       similar to those described in the previous paragraph.
 
     In order to facilitate the offering of the common stock, the underwriters
may engage in transactions that stabilize, maintain or affect the price of the
common stock. Specifically, the underwriters may agree to sell or allot more
shares than the 4,000,000 shares of common stock Marimba and the selling
stockholders have agreed to sell them. This over-allotment would create a short
position in the common stock for the underwriters' account. To cover any
over-allotments or to stabilize the price of the common stock, the underwriters
may bid for, and purchase, shares of common stock in the open market. Finally,
 
                                       68
<PAGE>   69
 
the underwriting syndicate may reclaim selling concessions allowed to an
underwriter or a dealer for distributing the common stock in the offering, if
the syndicate repurchases previously distributed common stock in transactions to
cover syndicate short positions, in stabilization transactions or in other
transactions. Any of these activities may stabilize or maintain the market price
of the common stock above independent market levels. The underwriters are not
required to engage in these activities, and may end any of these activities at
any time.
 
     Marimba, the selling stockholders and the underwriters have agreed to
indemnify each other against some liabilities, including liabilities under the
Securities Act.
 
     In October 1997, Marimba sold 2,987,696 shares of Series B preferred stock.
An affiliate of Hambrecht & Quist LLC, one of the underwriters in this offering,
purchased 39,943 shares of Series B preferred stock, which are convertible into
39,943 shares of common stock, on the same terms as the other purchasers of
Series B preferred stock.
 
PRICING OF THE OFFERING
 
     Before this offering, there has been no public market for the shares of
common stock. The initial public offering price has been determined by
negotiations between Marimba and the representatives. Among the factors to be
considered in determining the initial public offering price were:
 
     - the future prospects of Marimba and its industry in general;
 
     - sales, earnings and selected other financial operating information of
       Marimba in recent periods; and
 
     - the price-earnings ratios, price-sales ratios, market prices of
       securities and financial and operating information of companies engaged
       in activities similar to those of Marimba.
 
                                 LEGAL MATTERS
 
     The validity of the common stock being offered will be passed upon for
Marimba by Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, Menlo
Park, California and for the underwriters by Fenwick & West LLP, Palo Alto,
California. As of the date of this prospectus, members and employees of
Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, beneficially
owned an aggregate of 23,610 shares of our common stock.
 
                                    EXPERTS
 
     Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements at December 31, 1997 and 1998, for the period from February
21, 1996 (inception) to December 31, 1996, and for each of the years in the
two-year period ended December 31, 1998 as described in their report. We have
included our financial statements in the prospectus and elsewhere in the
registration statement in reliance on Ernst & Young LLP's report, given upon the
authority of Ernst & Young LLP as experts in accounting and auditing.
 
                                       69
<PAGE>   70
 
                      WHERE YOU CAN FIND MORE INFORMATION
 
     We have filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act with respect to the common stock
being offered. This prospectus does not contain all of the information presented
in the registration statement and the exhibits to the registration statement.
For further information with respect to Marimba and our common stock we are
offering, reference is made to the registration statement and the exhibits filed
as a part of the registration statement. Statements contained in this prospectus
concerning the contents of any contract or any other document referred to may be
only summaries of these documents. The exhibits to this registration statement
should be referenced for the complete contents of these contracts and documents.
Each statement is qualified in all respects by reference to the exhibit. The
registration statement, including the exhibits, may be inspected without charge
at the public reference facilities maintained by the Commission in Room 1024,
450 Fifth Street, N.W., Washington, D.C. 20549, and copies of all or any part
may be obtained from this office after payment of fees prescribed by the
Commission. The Commission maintains a World Wide Web site that contains
reports, proxy and information statements and other information regarding
registrants, including us, that file electronically with the Commission. The
address of the site is http://www.sec.gov.
 
                                       70
<PAGE>   71
 
                                 MARIMBA, INC.
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<S>                                                           <C>
Report of Ernst & Young LLP, Independent Auditors...........  F-2
Consolidated Financial Statements
  Consolidated Balance Sheets...............................  F-3
  Consolidated Statements of Operations and Comprehensive
     Loss...................................................  F-4
  Consolidated Statements of Redeemable Convertible
     Preferred Stock and Stockholders' Equity (Net Capital
     Deficiency)............................................  F-5
  Consolidated Statements of Cash Flows.....................  F-6
Notes to Consolidated Financial Statements..................  F-7
</TABLE>
 
                                       F-1
<PAGE>   72
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
Marimba, Inc.
 
     We have audited the accompanying consolidated balance sheets of Marimba,
Inc. as of December 31, 1997 and 1998, and the related consolidated statements
of operations and comprehensive loss, redeemable convertible preferred stock and
stockholders' equity (net capital deficiency), and cash flows for the period
from inception (February 21, 1996) to December 31, 1996 and for the years ended
December 31, 1997 and 1998. These financial statements are the responsibility of
the Company's management. Our responsibility is to express an opinion on these
financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the consolidated financial position of Marimba, Inc.
at December 31, 1997 and 1998, and the consolidated results of its operations
and its cash flows for the period from inception (February 21, 1996) to December
31, 1996 and for the years ended December 31, 1997 and 1998, in conformity with
generally accepted accounting principles.
 
                                          /s/ ERNST & YOUNG LLP
Palo Alto, California
January 13, 1999
 
                                       F-2
<PAGE>   73
 
                                 MARIMBA, INC.
 
                          CONSOLIDATED BALANCE SHEETS
                     (IN THOUSANDS, EXCEPT PAR VALUE DATA)
 
<TABLE>
<CAPTION>
                                                                                       PRO FORMA
                                                                                     STOCKHOLDERS'
                                                                 DECEMBER 31,          EQUITY AT
                                                              -------------------    DECEMBER 31,
                                                               1997        1998          1998
                                                              -------    --------    -------------
                                                                                      (UNAUDITED)
<S>                                                           <C>        <C>         <C>
ASSETS
Current assets:
     Cash and cash equivalents..............................  $14,402    $  3,700
     Short-term investments.................................       --       4,125
     Accounts receivable, net of allowances of $49 and $70
       at December 31, 1997 and 1998........................    4,591       2,585
     Unbilled receivables...................................       --       1,036
     Prepaid expenses and other current assets..............      248         371
                                                              -------    --------
          Total current assets..............................   19,241      11,817
Property and equipment, net.................................    2,401       2,747
Other assets................................................      256         298
                                                              -------    --------
                                                              $21,898    $ 14,862
                                                              =======    ========
LIABILITIES AND STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)
Current liabilities:
     Accounts payable and accrued liabilities...............  $ 1,940    $  1,396
     Accrued compensation...................................    1,535       1,704
     Current portion of capital lease obligations and
       equipment advances...................................      133         286
     Deferred revenue.......................................    7,597       5,519
                                                              -------    --------
          Total current liabilities.........................   11,205       8,905
Long-term portion of capital lease obligations and equipment
  advances, and other long-term liabilities.................      211         747
Commitments and contingencies
Redeemable convertible preferred stock, 15,000 shares
  authorized at December 31, 1997 and 1998, $.0001 par
  value, issuable in series:
     Series A redeemable convertible preferred stock, 2,800
       shares designated; 2,766 shares issued and
       outstanding at December 31, 1997 and 1998 and none
       pro forma (liquidation preference at December 31,
       1998 of $4,100)......................................    4,055       4,055      $     --
     Series B redeemable convertible preferred stock, 3,050
       shares designated; 2,987 shares issued and
       outstanding at December 31, 1997 and 1998 and none
       pro forma (liquidation preference at December 31,
       1998 of $14,960).....................................   14,898      14,898            --
Stockholders' equity (net capital deficiency):
     Common stock, 30,000 shares authorized, $.0001 par
       value; 13,067 and 13,053 shares issued and
       outstanding at December 31, 1997 and 1998, and 18,806
       shares issued and outstanding pro forma..............        1           1             2
     Additional paid-in capital.............................      641       2,182        21,134
     Note receivable from officer...........................     (150)       (160)         (160)
     Deferred compensation..................................       --      (1,116)       (1,116)
     Cumulative translation adjustment......................       --          (6)           (6)
     Accumulated deficit....................................   (8,963)    (14,644)      (14,644)
                                                              -------    --------      --------
          Stockholders' equity (net capital deficiency).....   (8,471)    (13,743)     $  5,210
                                                              -------    --------      ========
                                                              $21,898    $ 14,862
                                                              =======    ========
</TABLE>
 
                            See accompanying notes.
                                       F-3
<PAGE>   74
 
                                 MARIMBA, INC.
 
          CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                             PERIOD FROM
                                                              INCEPTION
                                                            (FEBRUARY 21,       YEAR ENDED
                                                              1996) TO         DECEMBER 31,
                                                            DECEMBER 31,    ------------------
                                                                1996         1997       1998
                                                            -------------   -------    -------
<S>                                                         <C>             <C>        <C>
Revenues:
     License..............................................     $    --      $ 5,011    $13,901
     Service..............................................          --          552      3,184
                                                               -------      -------    -------
Total revenues............................................          --        5,563     17,085
Cost of revenues:
     License..............................................          --           13         75
     Service..............................................          --          621      1,964
                                                               -------      -------    -------
Total cost of revenues....................................          --          634      2,039
                                                               -------      -------    -------
Gross profit..............................................          --        4,929     15,046
Operating expenses:
     Research and development.............................         515        2,410      5,773
     Sales and marketing..................................         473        8,054     12,371
     General and administrative...........................         322        2,367      2,779
     Amortization of deferred compensation................          --           --        251
                                                               -------      -------    -------
Total operating expenses..................................       1,310       12,831     21,174
                                                               -------      -------    -------
Loss from operations......................................      (1,310)      (7,902)    (6,128)
Interest income...........................................          66          350        518
Interest expense..........................................          (1)         (12)       (30)
                                                               -------      -------    -------
Loss before income taxes..................................      (1,245)      (7,564)    (5,640)
Provision for income taxes................................          --          154         41
                                                               -------      -------    -------
Net loss..................................................      (1,245)      (7,718)    (5,681)
Other comprehensive loss:
     Translation adjustment...............................          --           --         (6)
                                                               -------      -------    -------
Comprehensive loss........................................     $(1,245)     $(7,718)   $(5,687)
                                                               =======      =======    =======
Basic and diluted net loss per share......................     $  (.81)     $ (1.57)   $  (.59)
                                                               =======      =======    =======
Weighted-average shares of common stock outstanding used
  in computing basic and diluted net loss per share.......       1,528        4,912      9,606
                                                               =======      =======    =======
Pro forma basic and diluted net loss per share
  (unaudited).............................................                             $  (.37)
                                                                                       =======
Shares used in computing pro forma basic and diluted net
  loss per share (unaudited)..............................                              15,359
                                                                                       =======
</TABLE>
 
                            See accompanying notes.
 
                                       F-4
<PAGE>   75
 
                                 MARIMBA, INC.
 
       CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK
               AND STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)
                                 (IN THOUSANDS)
<TABLE>
<CAPTION>
                                                               STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)
                                          REDEEMABLE      --------------------------------------------------------
                                         CONVERTIBLE                                        NOTE
                                       PREFERRED STOCK     COMMON STOCK     ADDITIONAL   RECEIVABLE
                                       ----------------   ---------------    PAID-IN        FROM        DEFERRED
                                       SHARES   AMOUNT    SHARES   AMOUNT    CAPITAL      OFFICER     COMPENSATION
                                       ------   -------   ------   ------   ----------   ----------   ------------
<S>                                    <C>      <C>       <C>      <C>      <C>          <C>          <C>
Issuance of common stock to
 founders............................     --    $   --    10,000   $   1      $    9       $  --        $    --
Issuance of Series A redeemable
 convertible preferred stock to
 investors, net of issuance costs of
 $38.................................  2,699     3,963       --       --          --          --             --
Net loss.............................     --        --       --       --          --          --             --
                                       -----    -------   ------   ------     ------       -----        -------
Balances at December 31, 1996........  2,699     3,963    10,000       1           9          --             --
Issuance of Series A redeemable
 convertible preferred stock to
 officer, net of issuance costs of
 $8..................................     67        92       --       --          --          --             --
Issuance of Series B redeemable
 convertible preferred stock to
 investors, net of issuance costs of
 $62.................................  2,987    14,898       --       --          --          --             --
Issuance of common stock upon
 exercise of stock options...........     --        --    2,850       --         495          --             --
Issuance of common stock for
 services............................     --        --       67       --          10          --             --
Issuance of common stock upon
 exercise of stock options by an
 officer in exchange for a note
 receivable..........................     --        --      300       --         150        (150)            --
Repurchases of common stock..........     --        --     (150)      --         (23)         --             --
Net loss.............................     --        --       --       --                      --             --
                                       -----    -------   ------   ------     ------       -----        -------
Balances at December 31, 1997........  5,753    18,953    13,067       1         641        (150)            --
Issuance of common stock upon
 exercise of stock options...........     --        --      239       --         230          --             --
Repurchases of common stock..........     --        --     (253)      --         (56)         --             --
Translation adjustment...............     --        --       --       --                      --             --
Interest on note receivable from an
 officer.............................     --        --       --       --                     (10)            --
Deferred compensation................     --        --       --       --       1,367          --         (1,367)
Amortization of deferred
 compensation........................     --        --       --       --          --          --            251
Net loss.............................     --        --       --       --          --          --             --
                                       -----    -------   ------   ------     ------       -----        -------
Balances at December 31, 1998........  5,753    $18,953   13,053   $   1      $2,182       $(160)       $(1,116)
                                       =====    =======   ======   ======     ======       =====        =======
 
<CAPTION>
                                       STOCKHOLDERS' EQUITY (NET CAPITAL DEFICIENCY)
                                       -----------------------------------------
                                                                   STOCKHOLDERS'
                                       CUMULATIVE                     EQUITY
                                       TRANSLATION   ACCUMULATED   (NET CAPITAL
                                       ADJUSTMENT      DEFICIT      DEFICIENCY)
                                       -----------   -----------   -------------
<S>                                    <C>           <C>           <C>
Issuance of common stock to
 founders............................      $--        $     --       $     10
Issuance of Series A redeemable
 convertible preferred stock to
 investors, net of issuance costs of
 $38.................................       --              --             --
Net loss.............................       --          (1,245)        (1,245)
                                           ---        --------       --------
Balances at December 31, 1996........       --          (1,245)        (1,235)
Issuance of Series A redeemable
 convertible preferred stock to
 officer, net of issuance costs of
 $8..................................       --              --             --
Issuance of Series B redeemable
 convertible preferred stock to
 investors, net of issuance costs of
 $62.................................       --              --
Issuance of common stock upon
 exercise of stock options...........       --              --            495
Issuance of common stock for
 services............................       --              --             10
Issuance of common stock upon
 exercise of stock options by an
 officer in exchange for a note
 receivable..........................       --              --             --
Repurchases of common stock..........       --              --            (23)
Net loss.............................       --          (7,718)        (7,718)
                                           ---        --------       --------
Balances at December 31, 1997........       --          (8,963)        (8,471)
Issuance of common stock upon
 exercise of stock options...........       --              --            230
Repurchases of common stock..........       --              --            (56)
Translation adjustment...............       (6)             --             (6)
Interest on note receivable from an
 officer.............................       --              --            (10)
Deferred compensation................       --              --             --
Amortization of deferred
 compensation........................       --              --            251
Net loss.............................       --          (5,681)        (5,681)
                                           ---        --------       --------
Balances at December 31, 1998........      $(6)       $(14,644)      $(13,743)
                                           ===        ========       ========
</TABLE>
 
                            See accompanying notes.
                                       F-5
<PAGE>   76
 
                                 MARIMBA, INC.
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                              PERIOD FROM
                                                               INCEPTION
                                                             (FEBRUARY 21,       YEAR ENDED
                                                               1996) TO         DECEMBER 31,
                                                             DECEMBER 31,    ------------------
                                                                 1996         1997       1998
                                                             -------------   -------    -------
<S>                                                          <C>             <C>        <C>
OPERATING ACTIVITIES
Net loss...................................................     $(1,245)     $(7,718)   $(5,681)
Adjustments to reconcile net loss to net cash used in
  operating activities:
     Depreciation and amortization.........................          21          336        934
     Amortization of deferred compensation.................          --           --        251
     Other.................................................          --           --        (16)
     Changes in operating assets and liabilities:
       Accounts receivable, net............................         (50)      (4,541)     2,006
       Unbilled receivables................................          --           --     (1,036)
       Prepaid expenses and other current assets...........         (31)        (218)      (123)
       Accounts payable and accrued liabilities............         228        1,712       (544)
       Accrued compensation................................          --        1,535        169
       Deferred revenue....................................         200        7,397     (2,078)
       Other liabilities...................................          --           34          2
                                                                -------      -------    -------
          Net cash used in operating activities............        (877)      (1,463)    (6,116)
                                                                -------      -------    -------
INVESTING ACTIVITIES
Capital expenditures.......................................        (278)      (2,479)    (1,280)
Other assets...............................................          (7)        (250)       (42)
Purchases of short-term investments........................          --           --     (7,125)
Sales of short-term investments............................          --           --      3,000
                                                                -------      -------    -------
          Net cash used in investing activities............        (285)      (2,729)    (5,447)
                                                                -------      -------    -------
FINANCING ACTIVITIES
Proceeds from issuance of redeemable convertible preferred
  stock....................................................       3,963       14,990         --
Proceeds from issuance of common stock, net of
  repurchases..............................................          10          482        174
Proceeds from sale and lease back and equipment advances...          --          378        811
Principal payments under capital lease obligations.........          --          (67)      (124)
                                                                -------      -------    -------
          Net cash from financing activities...............       3,973       15,783        861
                                                                -------      -------    -------
Net increase (decrease) in cash and cash equivalents.......       2,811       11,591    (10,702)
Cash and cash equivalents at beginning of period...........          --        2,811     14,402
                                                                -------      -------    -------
Cash and cash equivalents at end of period.................     $ 2,811      $14,402    $ 3,700
                                                                =======      =======    =======
Supplemental disclosure of cash flow information
Interest paid..............................................     $     1      $    12    $    30
                                                                =======      =======    =======
Income taxes paid..........................................     $    --      $   154    $    41
                                                                =======      =======    =======
Supplemental disclosure of noncash financing activities
Common stock issued in exchange for note receivable from
  officer..................................................     $    --      $   150    $    --
                                                                =======      =======    =======
</TABLE>
 
                            See accompanying notes.
 
                                       F-6
<PAGE>   77
 
                                 MARIMBA, INC.
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  Basis of Presentation
 
     Marimba was incorporated in Delaware on February 21, 1996. Marimba develops
and markets Internet-based software management solutions ("Castanet Products"),
that distribute, update, and manage applications and related data over corporate
intranets, extranets and the Internet. Marimba markets its products worldwide
through a combination of a direct sales force and OEM/distributor partners.
Substantially all of Marimba's license revenues are derived from sales of the
Castanet Products. The Castanet Products are the subject of a patent lawsuit.
Marimba believes that it has strong defenses against the lawsuit. However, the
failure of Marimba to prevail could have a material adverse effect on Marimba's
results of operations and financial condition. Currently, no reasonable estimate
can be made of the possible loss or range of loss that may arise from this
lawsuit. See Note 8.
 
     The consolidated financial statements include the accounts of Marimba and
its wholly owned subsidiary in the United Kingdom. Intercompany accounts and
transactions have been eliminated in consolidation.
 
     Marimba has incurred operating losses to date and had an accumulated
deficit of $14,644,000 at December 31, 1998. Marimba's activities have been
primarily financed through private placements of equity securities. Marimba may
need to raise additional capital through the issuance of debt or equity
securities. Such financing may not be available on terms satisfactory to
Marimba, if at all.
 
  Use of Estimates
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Actual results could differ materially from those estimates.
 
  Revenue Recognition
 
     License revenues are comprised of perpetual or multiyear license fees which
are primarily derived from contracts with corporate customers and resellers.
Such revenues are recognized after execution of a license agreement or receipt
of a definitive purchase order, and delivery of the product to end-user
customers, provided that there are no uncertainties surrounding product
acceptance, the license fees are fixed and determinable, collectibility is
probable and Marimba has no remaining obligations. Revenue on arrangements with
customers who are not the ultimate users (primarily resellers) is not recognized
until the product is delivered to the end user. If the fee due from the customer
is not fixed or determinable, revenue is recognized as payments become due from
the customer. If collectibility is not considered probable, revenue is
recognized when the fee is collected. Advance payments are recorded as deferred
revenue until the products are shipped, services are provided, or obligations
are met. Marimba's products do not require significant customization.
 
     Service revenues are comprised of revenue from maintenance agreements,
consulting and training fees. Software maintenance agreements provide technical
support and the right to unspecified upgrades on an if-and-when available basis.
 
     Revenue from maintenance agreements is deferred and recognized on a
straight-line basis over the life of the related agreement, which is typically
one year. Service revenues from training and consulting are recognized upon
completion of the work to be performed.
 
                                       F-7
<PAGE>   78
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
 
  Revenue Recognition (continued)
     In October 1997, the Accounting Standards Executive Committee issued
Statement of Position 97-2 ("SOP 97-2"), as amended by SOP 98-4 and SOP 98-9,
"Software Revenue Recognition." These statements provide guidance on applying
generally accepted accounting principles in recognizing revenue on software
transactions. SOP 97-2, as amended by SOP 98-4, is effective for Marimba's
transactions entered into subsequent to January 1, 1998. The application of SOP
97-2 and SOP 98-4 has not had a material impact on Marimba's results of
operations.
 
     SOP 98-9 amends SOP 97-2 and 98-4, extending the deferral of the
application of certain provisions of SOP 97-2 amended by SOP 98-4 through fiscal
years beginning on or before March 15, 1999. All other provisions of SOP 98-9
are effective for transactions entered into in fiscal years beginning after
March 15, 1999. Marimba has not yet determined the effect of the final adoption
of SOP 98-9 on its financial condition or results of operations. However, SOP
98-9 may require more revenue to be deferred for certain types of transactions.
 
     Unbilled receivables consist of contractually obligated amounts not yet
billable by the Company.
 
  Research and Development
 
     Research and development expenditures are generally charged to operations
as incurred. Statement of Financial Accounting Standards No. 86, "Accounting for
the Costs of Computer Software to Be Sold, Leased or Otherwise Marketed,"
requires the capitalization of certain software development costs subsequent to
the establishment of technological feasibility, which, for Marimba, is
established upon completion of a working model. Costs incurred by Marimba
between completion of the working model and the point at which the product is
ready for general release have been insignificant. Therefore, through December
31, 1998, all research and development costs have been expensed as incurred.
 
  Cash, Cash Equivalents and Short-Term Investments
 
     Cash equivalents consist of financial instruments which are readily
convertible to cash and have original maturities of three months or less at the
time of acquisition. Marimba's cash and cash equivalents as of December 31, 1998
consist primarily of demand deposits and money market funds held by large
financial institutions in the United States. The carrying value of cash and cash
equivalents approximates fair value at December 31, 1997 and 1998.
 
     Marimba classifies, at the date of acquisition, its marketable securities
into available-for-sale categories in accordance with the provisions of the
Financial Accounting Standards Board's Statement of Financial Accounting
Standards No. 115, "Accounting for Certain Investments in Debt and Equity
Securities." Currently, Marimba classifies its securities as available-for-sale
which are reported at fair market value with the related unrealized gains and
losses included in stockholders' equity. Unrealized gains and losses were not
material for all periods presented. Realized gains and losses and declines in
value of securities judged to be other than temporary are included in interest
income. Interest and dividends on all securities are included in interest
income.
 
     Investments with maturities between three and twelve months are considered
short-term investments. Short-term investments consist of corporate notes and
market auction rate preferred stocks.
 
                                       F-8
<PAGE>   79
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
 
  Cash, Cash Equivalents and Short-Term Investments (continued)
     The cost (which approximates fair value) of Marimba's investments at
December 31, 1998 consisted of commercial paper ($500,000), corporate notes
($1,025,000) and market auction rate preferred stock ($3,100,000).
 
     The following is a reconciliation of Marimba's cash, cash equivalents and
short-term investments to the balance sheet classifications:
 
<TABLE>
<CAPTION>
                                                         DECEMBER 31,
                                                       -----------------
                                                        1997       1998
                                                       -------    ------
                                                        (IN THOUSANDS)
<S>                                                    <C>        <C>
Amounts included in cash and cash equivalents........  $    --    $  500
Short-term investments...............................       --     4,125
                                                       -------    ------
          Total investments..........................       --     4,625
Money market fund....................................   14,402     2,689
Demand deposits......................................       --       511
                                                       -------    ------
          Total cash, cash equivalents and short-term
             investments.............................  $14,402    $7,825
                                                       =======    ======
</TABLE>
 
  Property and Equipment
 
     Marimba records property and equipment at cost and calculates depreciation
using the straight-line method over the estimated useful lives of the assets,
generally three to five years. Leasehold improvements are amortized over the
term of the lease.
 
  Accounting for Stock-Based Compensation
 
     Marimba has elected to follow Accounting Principles Board Opinion No. 25,
"Accounting for Stock Issued to Employees" (APB Opinion No. 25), and related
interpretations in accounting for its employee stock options because, as
discussed in Note 6, the alternative fair value accounting provided for under
Statement of Financial Accounting Standards No. 123, "Accounting for Stock-Based
Compensation" ("FAS 123"), requires use of option valuation models that were not
developed for use in valuing employee stock options. Under APB Opinion No. 25,
when the exercise price of Marimba's employee stock options equals the market
price of the underlying stock on the date of grant, no compensation expense is
recognized. See pro forma disclosures of applying FAS 123 included in Note 6.
 
  Comprehensive Loss
 
     In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 130, "Reporting Comprehensive Income" ("FAS
130"). FAS 130 establishes standards for the reporting and display of
comprehensive income and its components in a full set of general purpose
financial statements and is effective for fiscal years beginning after December
15, 1997. Marimba adopted FAS 130 in the year ended December 31, 1998.
 
                                       F-9
<PAGE>   80
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
  Concentrations of Credit Risk and Other Risks
 
     Financial instruments that subject Marimba to credit risk consist primarily
of uninsured cash, cash equivalents and short-term investment balances held at
commercial banks and institutions primarily in the United States and trade
receivables from Marimba's customers. Marimba sells to customers in many
different industries. Marimba extends reasonably short credit terms in most
instances and performs ongoing credit evaluations but does not require
collateral. Marimba provides reserves for potential credit losses, and such
losses have been within management's expectations. To date, Marimba's write-offs
of bad debts have not been significant. During the years ended December 31, 1997
and 1998, Marimba added approximately $50,000 and $75,000 to its bad debt
reserves. Total write-offs of uncollectible accounts were $1,000 and $54,000 in
these periods.
 
     Revenues from one reseller represented 18% and 22% of total revenues for
the years ended December 31, 1997 and 1998. However, as of December 31, 1998
this customer will no longer be an active reseller of our products. The same
reseller accounted for 57% of accounts receivable at December 31, 1997. Sales to
another reseller represented 18% of total revenues for the year ended December
31, 1998. Two other customers accounted for 48% and 16% of the combined accounts
receivable and unbilled receivables accounts at December 31, 1998.
 
  Segment Information
 
     In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 131, "Disclosures about Segments of an
Enterprise and Related Information" ("FAS 131"). FAS 131 changes the way
companies report selected segment information in annual financial statements and
requires companies to report selected segment information in interim financial
reports to stockholders. FAS 131 is effective beginning in Marimba's year ended
December 31, 1998. Marimba operates solely in one segment, the development and
marketing of network application software, and therefore there is no impact to
Marimba's financial statements of adopting FAS 131. For the years ended December
31, 1997 and 1998, sales to customers outside the United States were $1,199,000
and $1,265,000. The majority of these sales were to customers in Asia.
 
  Net Loss Per Share
 
     Basic and diluted net loss per common share are presented in conformity
with FAS No. 128, "Earnings Per Share" ("FAS 128"), for all periods presented.
Pursuant to the Securities and Exchange Commission Staff Accounting Bulletin No.
98, common stock and convertible preferred stock issued or granted for nominal
consideration prior to the anticipated effective date of Marimba's initial
public offering must be included in the calculation of basic and diluted net
loss per common share as if they had been outstanding for all periods presented.
To date, Marimba has not had any issuances or grants for nominal consideration.
 
     In accordance with FAS 128, basic and diluted net loss per share has been
computed using the weighted-average number of shares of common stock outstanding
during the period, less shares subject to repurchase. Pro forma basic and
diluted net loss per share, as presented in the statements of operations, has
been computed as described above and also gives effect, under Securities and
Exchange Commission guidance, to the conversion of the redeemable convertible
preferred stock (using the if-converted method) from the original date of
issuance.
 
                                      F-10
<PAGE>   81
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
 
  Net Loss Per Share (continued)
     The following table presents the calculation of basic and diluted and pro
forma basic and diluted net loss per share:
 
<TABLE>
<CAPTION>
                                                         PERIOD FROM
                                                          INCEPTION           YEAR ENDED
                                                     (FEBRUARY 21, 1996)     DECEMBER 31,
                                                             TO            -----------------
                                                      DECEMBER 31, 1996     1997      1998
                                                     -------------------   -------   -------
                                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                  <C>                   <C>       <C>
Net loss...........................................        $(1,245)        $(7,718)  $(5,681)
                                                           =======         =======   =======
Basic and diluted:
     Weighted-average shares of common stock
       outstanding.................................         10,000          11,474    13,081
     Less weighted-average shares subject to
       repurchase..................................         (8,472)         (6,562)   (3,475)
                                                           -------         -------   -------
     Weighted-average shares used in computing
       basic and diluted net loss per common
       share.......................................          1,528           4,912     9,606
                                                           -------         -------   -------
     Basic and diluted net loss per common share...        $  (.81)        $ (1.57)  $  (.59)
                                                           =======         =======   =======
Pro forma:
     Shares used above.............................                                    9,606
     Pro forma adjustment to reflect
       weighted-average effect of the assumed
       conversion of redeemable convertible
       preferred stock (unaudited).................                                    5,753
                                                                                     -------
     Shares used in computing pro forma basic and
       diluted net loss per share (unaudited)......                                   15,359
                                                                                     -------
     Pro forma basic and diluted net loss per share
       (unaudited).................................                                  $  (.37)
                                                                                     =======
</TABLE>
 
     Marimba has excluded all redeemable convertible preferred stock, warrants,
outstanding stock options and shares subject to repurchase by Marimba from the
calculation of diluted loss per share because all such securities are
antidilutive for all periods presented. Weighted-average options and warrants
outstanding to purchase 375,000, 1,261,000, and 1,483,000 shares of common and
redeemable convertible preferred stock for the years ended December 31, 1996,
1997, and 1998, were not included in the computation of diluted net loss per
share because the effect would be antidilutive. Such securities, had they been
dilutive, would have been included in the computation of diluted net loss per
share using the treasury stock method.
 
  Unaudited Pro Forma Stockholders' Equity
 
     If the offering contemplated by this prospectus is consummated, all of the
redeemable convertible preferred stock outstanding will automatically be
converted into common stock. Unaudited pro forma stockholders' equity at
December 31, 1998, as adjusted for the assumed conversion of redeemable
 
                                      F-11
<PAGE>   82
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
 
  Unaudited Pro Forma Stockholders' Equity (continued)
convertible preferred stock based on the shares of redeemable convertible
preferred stock outstanding at December 31, 1998, is disclosed on the balance
sheet.
 
  Recent Accounting Pronouncements
 
     In June 1998, the FASB issued FAS No. 133, "Accounting for Derivative
Instruments and Hedging Activities" ("FAS 133"). Marimba is required to adopt
FAS 133 for the year ending December 31, 2000. FAS 133 establishes methods of
accounting for derivative financial instruments and hedging activities related
to those instruments as well as other hedging activities. Because Marimba
currently holds no derivative financial instruments and does not currently
engage in hedging activities, adoption of FAS 133 is expected to have no
material impact on Marimba's financial condition or results of operations.
 
     In March 1998, the American Institute of Certified Public Accountants
issued SOP 98-1, "Accounting for the Costs of Computer Software Developed or
Obtained for Internal Use" ("SOP 98-1"). SOP 98-1 requires that entities
capitalize certain costs related to internal use software once certain criteria
have been met. Marimba is required to implement SOP 98-1 for the year ending
December 31, 1999. Adoption of SOP 98-1 is expected to have no material impact
on Marimba's financial condition or results of operations.
 
2. PROPERTY AND EQUIPMENT
 
     Property and equipment consist of the following:
 
<TABLE>
<CAPTION>
                                                 DECEMBER 31,
                                               -----------------
                                                1997      1998
                                               ------    -------
                                                (IN THOUSANDS)
<S>                                            <C>       <C>
Furniture and equipment......................  $1,191    $   759
Computer equipment...........................   1,440      3,036
Leasehold improvements.......................     125        241
                                               ------    -------
                                                2,756      4,036
Accumulated depreciation and amortization....    (355)    (1,289)
                                               ------    -------
Property and equipment, net..................  $2,401    $ 2,747
                                               ======    =======
</TABLE>
 
     Property and equipment at December 31, 1997 and 1998 includes assets under
capitalized leases of approximately $378,000. Accumulated amortization related
to leased assets was approximately $223,000 and $280,000 at December 31, 1997
and 1998.
 
3. LEASES AND COMMITMENTS
 
     In January 1997, as part of a sale-leaseback transaction, Marimba entered
into a $500,000 capital lease line of credit for financing of equipment, which
expired on December 31, 1997. Marimba borrowed $378,000 under the line of
credit. This amount bears interest at a rate of 3.5% and is collateralized by
the equipment purchased. Under the terms of the master lease agreement, Marimba
will have the option to purchase the leased equipment at a negotiated price at
the end of the 36-month lease term. In connection
 
                                      F-12
<PAGE>   83
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
 3. LEASES AND COMMITMENTS (CONTINUED)
with the capital lease, Marimba issued a warrant that entitles the holder to
purchase 16,865 shares of Series A redeemable convertible preferred stock (see
Note 6).
 
     Marimba leases its office facilities under various noncancelable operating
lease agreements. Marimba's primary facility lease expires in 2000.
 
     As of December 31, 1998, future minimum lease payments under capital leases
and noncancelable operating leases are as follows:
 
<TABLE>
<CAPTION>
                                                              CAPITAL   OPERATING
                                                              LEASES     LEASES
                                                              -------   ---------
                                                                (IN THOUSANDS)
<S>                                                           <C>       <C>
Years ending December 31:
1999........................................................   $ 133     $1,370
2000........................................................      60        517
2001........................................................      --        140
2002........................................................      --        148
2003 and thereafter.........................................      --        421
                                                               -----     ------
          Total minimum lease and principal payments........     193     $2,596
                                                                         ======
Amount representing interest................................      (6)
                                                               -----
Present value of future payments............................     187
Current portion of capital lease obligations................    (127)
                                                               -----
Noncurrent portion..........................................   $  60
                                                               =====
</TABLE>
 
     Rent expense under operating leases totaled approximately $61,000,
$375,000, and $1,245,000 for the years ended December 31, 1996, 1997, and 1998.
 
4. BANK ARRANGEMENTS
 
     In May 1998, Marimba entered into a credit agreement with a bank which
provides for revolving credit loans, letters of credit, and nonformula and
equipment advance facilities aggregating up to $6,500,000. The loans and
advances are secured by substantially all of Marimba's assets. All of the credit
facilities bear interest at a rate equal to the prime rate (7.75% at December
31, 1998). The credit agreement contains certain financial and reporting
covenants, including a restriction on the payment of dividends. Marimba was in
compliance with these covenants at December 31, 1998.
 
     The amount available under the revolving credit facility is limited to the
lower of $4,000,000 and an amount equal to 80% of eligible accounts receivable,
which available amount is reduced by the amount of outstanding letters of
credit. Under the agreement, letters of credit can be drawn up to an amount not
to exceed $500,000. As of December 31, 1998, no revolving credit loans had been
borrowed or letters of credit issued.
 
     Marimba may borrow up to $1,000,000 under the nonformula-based advance. As
of December 31, 1998, no amounts have been borrowed under this facility.
 
     The equipment advance facility provides Marimba with the ability to borrow
up to $1,500,000. Principal and interest are due in monthly installments
beginning in June 1999 and ending in May 2002. As of December 31, 1998, Marimba
had $811,000 of outstanding borrowings under the facility. The fair
 
                                      F-13
<PAGE>   84
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
4. BANK ARRANGEMENTS (CONTINUED)
value of the equipment advance is estimated based on current interest rates
available to Marimba for debt instruments with similar terms, degrees of risk,
and remaining maturities. The carrying value of the equipment advance
approximates its fair value.
 
     Principal payments under this equipment advance are as follows (in
thousands):
 
<TABLE>
<S>                                                           <C>
1999........................................................  $ 159
2000........................................................    270
2001........................................................    270
2002........................................................    112
                                                              -----
          Total payments....................................    811
Less current portion........................................   (159)
                                                              -----
Long-term portion...........................................  $ 652
                                                              =====
</TABLE>
 
5. PREFERRED STOCK
 
     Marimba is authorized to issue up to 15,000,000 shares of preferred stock,
issuable in series, with the rights and preferences of each designated series to
be determined by Marimba's Board of Directors. To date, 2,800,000 and 3,050,000
shares have been designated as Series A and Series B redeemable convertible
preferred stock (the "Series A and Series B preferred stock").
 
     Each share of Series A and Series B preferred stock is convertible, at the
option of the holder, into one share of common stock, subject to certain
adjustments for dilutive issuances. Outstanding shares of convertible preferred
stock automatically convert into common stock upon the closing of an
underwritten public offering of common stock under the Securities Act of 1933 in
which Marimba receives at least $12,500,000 in gross proceeds and the price per
share is at least $7.51.
 
     Series A and Series B preferred stockholders are entitled to noncumulative
dividends of $.12 and $.40 per share. Dividends will be paid only when declared
by the Board of Directors out of legally available funds. No dividends have been
declared as of December 31, 1998.
 
     Series A and Series B preferred stockholders are entitled to receive, upon
a liquidating event, an amount per share equal to the issuance price, plus all
declared but unpaid dividends. Thereafter, the remaining assets and funds, if
any, shall be distributed among the holders of Series A and Series B preferred
stock and common stock pro rata based on the number of shares of common stock
held by each (assuming conversion of all such Series A and Series B preferred
stock). If any assets remain after the holders of Series A and Series B
preferred stock have received an aggregate of $4.45 and $7.51 per share, the
remaining assets will be distributed to the holders of the common stock pro rata
based on the number of shares of common stock held by each.
 
     On or at any time after August 15, 2003, Marimba shall, upon written
request from the holders of a majority of the then outstanding shares of Series
A and Series B preferred stock, redeem in whole or in part the Series A and
Series B preferred stock by paying in cash a sum equal to the original issuance
prices of $1.48 and $5.01 per share.
 
     Series A and Series B preferred stockholders have voting rights equal to
the common shares issuable upon conversion of the Series A and Series B
preferred stock.
 
                                      F-14
<PAGE>   85
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
6. STOCKHOLDERS' EQUITY
 
  Common Stock
 
     In February 1996, Marimba issued and sold an aggregate of 10,000,000 shares
of its common stock to the founders of Marimba under Restricted Common Stock
Purchase Agreements. The stock vests ratably over a period of three years. As of
December 31, 1998, 556,000 shares are subject to repurchase.
 
     At December 31, 1998, Marimba has reserved 5,770,000 shares of its common
stock for issuance upon conversion of its Series A and Series B preferred stock
and conversion of preferred shares issued upon exercise of outstanding warrants
and 3,422,341 shares of common stock for issuances upon exercise of options then
outstanding and available for grant under Marimba's 1996 Stock Option Plan.
 
     In November 1997, Marimba granted 300,000 options to purchase common stock
under Marimba's 1996 Stock Option Plan to an officer of Marimba who immediately
exercised the options in exchange for a full recourse note receivable of
$150,000. This note, which bears interest at 5.69%, was collateralized by
certain personal assets of the officer and was paid in full on January 8, 1999.
These shares are subject to a right of repurchase that lapses over three years.
 
  1996 Stock Option Plan
 
     In November 1996, the Board of Directors adopted the 1996 Stock Option Plan
(the "1996 Plan") for issuance of common stock to eligible participants.
Incentive stock options and nonstatutory stock options may be granted under the
1996 Plan at prices not less than 100% and 85% of the fair value on the date of
grant. Options expire after 10 years. Options under the plan are immediately
exercisable; however, shares issued are subject to Marimba's right to repurchase
such shares at the original issuance price, which right lapses in a series of
installments measured from the vesting commencement date of the option. As of
December 31, 1998, 1,174,000 shares are subject to repurchase. Options generally
vest and the repurchase rights lapse ratably over a period of three or four
years from the date of grant.
 
     Pro forma information regarding net loss and net loss per share is required
by FAS 123, and has been determined as if Marimba had accounted for its employee
stock options under the fair value method of that Statement. The fair value of
options was estimated at the date of grant using a minimum value option pricing
model with the following weighted-average assumptions: risk-free interest rate
of 6%, 6% and 5% in 1996, 1997 and 1998, and an expected life of four years and
no dividends for all years presented.
 
     For purposes of pro forma disclosures, the estimated fair value of the
options is amortized to expense over the vesting period of the options using a
graded vesting method. The effects of applying FAS 123 for pro forma disclosures
are not likely to be representative of the effects on reported net loss for
future years.
 
                                      F-15
<PAGE>   86
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
6. STOCKHOLDERS' EQUITY (CONTINUED)
 
  1996 Stock Option Plan (continued)
 
<TABLE>
<CAPTION>
                                                  PERIOD FROM
                                                   INCEPTION
                                                 (FEBRUARY 21,             YEAR ENDED
                                                   1996) TO               DECEMBER 31,
                                                 DECEMBER 31,       -------------------------
                                                     1996            1997            1998
                                                 -------------      -------      ------------
                                                    (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                              <C>                <C>          <C>
Net loss:
  As reported..................................     $(1,245)        $(7,718)       $(5,681)
                                                    =======         =======        =======
  Pro forma....................................     $(1,249)        $(7,771)       $(6,123)
                                                    =======         =======        =======
Pro forma basic and diluted net loss per share:
  As reported..................................                                    $  (.37)
                                                                                   =======
  Pro forma....................................                                    $  (.40)
                                                                                   =======
</TABLE>
 
     Activity under the 1996 Stock Option Plan was as follows:
 
<TABLE>
<CAPTION>
                                                               OPTIONS OUTSTANDING
                                                  ---------------------------------------------
                                      SHARES        NUMBER          PRICE          WEIGHTED-
                                    AVAILABLE         OF             PER            AVERAGE
                                    FOR GRANT       SHARES          SHARE        EXERCISE PRICE
                                    ----------    ----------    -------------    --------------
<S>                                 <C>           <C>           <C>              <C>
Authorized........................   3,174,603            --         --             --
Granted...........................  (1,499,000)    1,499,000        $ .15            $ .15
                                    ----------    ----------
Balance at December 31, 1996......   1,675,603     1,499,000        $ .15            $ .15
Authorized........................   2,000,000            --         --             --
Granted...........................  (2,529,610)    2,529,610    $ .15 - $ .75        $ .31
Exercised.........................          --    (3,217,110)   $ .15 - $ .50        $ .20
Repurchased.......................     150,000            --         --             --
Canceled..........................      17,000       (17,000)   $ .15 - $ .75        $ .68
                                    ----------    ----------
Balance at December 31, 1997......   1,312,993       794,500    $ .15 - $ .75        $ .41
Authorized........................   1,300,000            --         --             --
Granted...........................  (2,017,800)    2,017,800    $1.00 - $8.50        $3.54
Exercised.........................          --      (238,569)   $ .50 - $2.00        $ .96
Repurchased.......................     253,417            --         --             --
Canceled..........................     381,163      (381,163)   $ .15 - $3.50        $ .84
                                    ----------    ----------
Balance at December 31, 1998......   1,229,773     2,192,568    $ .15 - $8.50        $3.16
                                    ==========    ==========
</TABLE>
 
                                      F-16
<PAGE>   87
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
6. STOCKHOLDERS' EQUITY (CONTINUED)
 
  1996 Stock Option Plan (continued)
 
<TABLE>
<CAPTION>
                         OPTIONS OUTSTANDING AND EXERCISABLE
                       ----------------------------------------
                                                     WEIGHTED-
                                                      AVERAGE
                        NUMBER       WEIGHTED-       REMAINING
                          OF          AVERAGE       CONTRACTUAL
EXERCISE PRICE RANGE    SHARES     EXERCISE PRICE      LIFE
- --------------------   ---------   --------------   -----------
                                                    (IN YEARS)
<S>                    <C>         <C>              <C>
             $.15         72,000       $ .15           7.94
    $ .50 - $ .75        341,500       $ .54           8.77
    $1.00 - $1.50        255,818       $1.35           9.13
    $1.75 - $2.00        132,000       $1.83           9.34
    $3.00 - $3.50      1,042,000       $3.14           9.67
    $7.00 - $8.50        349,250       $8.21           9.94
                       ---------
                       2,192,568       $3.16           9.43
                       =========
</TABLE>
 
     At December 31, 1997, options to purchase 14,249 shares of common stock
were vested at a weighted-average exercise price of $.18 per share. At December
31, 1998, outstanding options to purchase 188,289 outstanding shares of common
stock were vested at a weighted-average exercise price of $.57 per share.
 
     The weighted-average fair value of options granted during 1996, 1997 and
1998 with an exercise price equal to the fair value of Marimba's common stock on
the date of grant was $.03, $.06 and $.73. The weighted-average fair value of
options granted during 1998 with an exercise price below the deemed fair value
of Marimba's common stock on the date of grant was $2.07.
 
     In connection with the grant of certain share options to employees through
December 31, 1998, Marimba recorded deferred compensation of approximately
$1,367,000 for the aggregate differences between the exercise prices of options
at their dates of grant and the deemed fair value for accounting purposes of the
common shares subject to such options. Such amount is included as a reduction of
stockholders' equity and is being amortized on a graded vesting method. The
compensation expense of $251,000 in 1998 relates to options awarded to employees
in all operating expense categories. This amount has not been separately
allocated to these categories.
 
  Warrants
 
     In January 1997, in connection with the sale-leaseback transaction, Marimba
issued a warrant that entitles the holder to purchase 16,865 shares of Series A
redeemable convertible preferred stock at an exercise price of $1.48 per share.
This warrant is exercisable through the earlier of the effective date of a
merger of Marimba or January 31, 2004. Marimba determined that the value of the
warrant was immaterial.
 
7. INCOME TAXES
 
     Marimba's provision for income taxes for the years ended December 31, 1997
and 1998 consists entirely of foreign withholding taxes.
 
                                      F-17
<PAGE>   88
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
7. INCOME TAXES (CONTINUED)
     As of December 31, 1998, Marimba had federal net operating loss
carryforwards of approximately $11,100,000. Marimba also had federal research
and development tax credit carryforwards of approximately $400,000. The net
operating loss and credit carryforwards will expire at various dates beginning
on 2011 through 2018, if not utilized.
 
     Utilization of the net operating losses and credits may be subject to a
substantial annual limitation due to the ownership change provisions of the
Internal Revenue Code of 1986 and similar state provisions. The annual
limitation may result in the expiration of net operating losses and credits
before utilization.
 
     Significant components of Marimba's deferred tax assets are as follows:
 
<TABLE>
<CAPTION>
                                                                 DECEMBER 31,
                                                              ------------------
                                                               1997       1998
                                                              -------    -------
                                                                (IN THOUSANDS)
<S>                                                           <C>        <C>
Deferred tax assets:
  Net operating loss carryforwards..........................  $ 3,300    $ 4,400
  Research credit carryforwards.............................      200        600
  Deferred revenue..........................................      100        900
  Other.....................................................       --        200
                                                              -------    -------
          Total deferred tax assets.........................    3,600      6,100
Valuation allowance.........................................   (3,600)    (6,100)
                                                              -------    -------
Net deferred tax assets.....................................  $    --    $    --
                                                              =======    =======
</TABLE>
 
     The valuation allowance for deferred tax assets increased by approximately
$3,100,000 in the year ended December 31, 1997.
 
8. LEGAL MATTERS
 
     On March 3, 1997, Novadigm, Inc. filed a complaint against Marimba in the
United States District Court for the Northern District of California, alleging
infringement of a patent held by Novadigm. Novadigm alleges that Marimba's
infringement relates to certain methods for updating data and software over a
computer network used in the Castanet products. In its complaint, Novadigm
requests preliminary and permanent injunctions prohibiting Marimba and other
specified persons from making, using or selling any infringing products, as well
as damages, costs, and attorneys' fees. The complaint also alleges that Marimba
has willfully infringed Novadigm's Patent, and seeks up to triple damages
pursuant to the United States Patent Act. To date, both parties have conducted
substantial discovery. If the court does not enter judgment based on any
dispositive motions, a jury trial of this action is currently scheduled to begin
in September 1999.
 
     Marimba believes that it has strong defenses against Novadigm's lawsuit.
Accordingly, Marimba intends to defend this suit vigorously. However, Marimba
may not prevail in this litigation. Litigation is subject to inherent
uncertainties, especially in cases such as this where sophisticated factual
issues must be assessed and complex technical issues must be decided. In
addition, cases such as this are likely to involve issues of law that are
evolving, presenting further uncertainty. Marimba's defense of this litigation,
regardless of the merits of the complaint, has been, and will likely continue to
be, time-consuming, costly and a diversion for Marimba's technical and
management personnel. However, the
 
                                      F-18
<PAGE>   89
                                 MARIMBA, INC.
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
8. LEGAL MATTERS (CONTINUED)
failure of Marimba to prevail in this litigation could have a material adverse
effect on the Company's results of operations and financial condition.
 
9. EVENTS SUBSEQUENT TO DATE OF AUDITOR'S REPORT (UNAUDITED)
 
  1999 Employee Stock Purchase Plan
 
     On February 2, 1999, the Board of Directors approved the adoption of
Marimba's 1999 employee stock purchase plan (the "1999 Purchase Plan"), subject
to stockholder approval. A total of 500,000 shares of common stock has been
reserved for issuance under the 1999 Purchase Plan, plus, commencing on January
1, 2000, annual increases equal to the lesser of 500,000 shares, 2% of the
outstanding common shares on such date or a lesser amount determined by the
Board of Directors. The 1999 Purchase Plan permits eligible employees to acquire
shares of Marimba's common stock through periodic payroll deductions of up to
15% of base cash compensation. No more than 500 shares may be purchased by each
employee on any purchase date. Each offering period will have a maximum duration
of 24 months. The price at which the common stock may be purchased is 85% of the
lesser of the fair market value of Marimba's common stock on the first day of
the applicable offering period or on the last day of the respective purchase
period. The initial offering period will commence on the effectiveness of the
initial public offering and will end on April 30, 2001.
 
  1999 Omnibus Equity Incentive Plan
 
     On February 2, 1999, the Board of Directors approved the adoption of
Marimba's 1999 Omnibus Equity Incentive Plan (the "1999 Omnibus Plan"), subject
to stockholder approval. A total of 1,250,000 shares of common stock have been
reserved for issuance to eligible participants under the 1999 Omnibus Plan. The
types of awards that may be made under the 1999 Omnibus Plan are options to
purchase shares of common stock, stock appreciation rights, restricted shares
and stock units. Any shares not yet issued under Marimba's 1996 Stock Plan as of
the date of Marimba's initial public offering will be available for grant under
the 1999 Omnibus Plan. The exercise price for incentive stock options may not be
less than 100% of the fair market value of Marimba's common stock on the date of
grant (85% for nonstatutory options). In the event of a change in control of
Marimba, an option or award under the 1999 Omnibus Plan will become fully
exercisable and fully vested if the option or award is not assumed by the
surviving corporation or the surviving corporation does not substitute
comparable awards for the awards granted under the 1999 Omnibus Plan.
 
  1999 Non-Employee Directors Option Plan
 
     On February 2, 1999, the Board of Directors approved the adoption of
Marimba's Non-Employee Directors Option Plan (the "1999 Directors Plan"),
subject to stockholder approval. A total of 150,000 shares of common stock have
been reserved per issuance to non-employee members of the Board. Commencing
January 1, 2000, the number of shares reserved per issuance will be increased
automatically to restore the total number of shares available under this plan to
150,000 shares.
 
  Deferred Compensation
 
     In April 1999, Marimba granted to employees options to purchase 1,047,000
shares of common stock at an exercise price of $15.00 per share. Marimba
estimates that it will record additional deferred compensation of approximately
$2,100,000 with regard to these grants.
 
                                      F-19
<PAGE>   90
                           DESCRIPTION OF GRAPHICS

Narrative Description of Inside Cover Gate Fold

Landscape Gate Fold, Inside Cover Page; Title Heading Left Justified [Marimba
logo]; caption to the right of logo--"A leading provider of Internet services
management solutions for a new generation of e-business services."
     
Below the caption is a large disk with a cloud-like figure in the center. Inside
the cloud-like figure is the word "Internet". The disk is captioned "Castanet
Infrastructure."

From the Internet are five leader lines extending to the outer edges of the
disk. Each set of leader lines intersect a box or boxes representing packages
software applications.

One set of leader lines extends to a group of four persons standing on the disk.
The caption next to the persons reads "Customers-
- -- Home banking
- -- Financial portfolio management
Gain efficient access to powerful, up-to-date and personalized e-business
applications, even over low speed dialup connections."

The next set of leader lines extends to a group of three buildings. The
caption next to the buildings reads "Remote Offices-
- -- Office productivity software
- -- Point-of-sale information  
Benefit from centralized management of corporate applications and services,
reducing the need for on-site support."

Another set of leader lines extends to a figure of a walking person. The
caption next to the person reads "Mobile Employees-
- -- Sales automation
- -- Expense reporting
Enables off-line use of applications and allows quick synchronization to the
latest information when reconnected."

Continuing around the disk, the next set of leader lines extends to a
building and a factory. The caption next to the building reads "Business
Partners-
- -- Supply chain management
- -- Order entry and tracking
- -- Financial services and trading    
Improve operational efficiencies and strengthen relationships through
collaborative exchange of applications, data and services across multiple
enterprises."

At the top of the disk is a large building followed by three small boxes leading
to the cloud-like figure in the middle of the disk. The caption next to this
building reads "Host Enterprise--With Castanet, the host enterprise can
distribute more compelling and cost-effective e-business applications and
services to employees, customers and business partners and centralize the
ongoing management of these applications and services." 

In the top right corner of the page is a square with five items in it. The five
items are a rectangle captioned "Application Server," another rectangle
captioned "Web Server," a depiction of a lock and key captioned "Security
Systems" and a cylinder captioned "Database Management System". In the middle of
the square is a cube captioned "Applications."

Below and to the right of the square is text reading "Marimba's
Strategy--Marimba intends to build upon the Castanet infrastructure to manage
the increasingly complex array of systems and components upon
which e-business applications depend." 

To the left of the disk is text reading "Internet Services Management--Enables
centralized control of e-business applications and services, which encompass 
business-to-business, business-to-employee and business-to-consumer 
communications and transactions over corporate intranets, extranets and the 
Internet." Below this is text reading "Marimba's Solution--The Castanet
product family provides automated distribution, updating and ongoing management
of e-business applications, data, documents and services throughout the extended
enterprise."


Along the bottom of the page, below the illustrations is the following text:
 
     The Benefits of Marimba's Solution-

     The Castanet product family enables companies to streamline business
     processes and deploy new applications and services quickly and
     efficiently in order to extend market reach and gain increased customer
     loyalty

     -- Delivers applications to a variety of operating systems, hardware 
        platforms and devices

     -- Provides security features to authenticate users and safeguard data 
        integrity and confidentiality

     -- Improves bandwidth efficiency, lowering network connection costs

     -- Repairs damaged applications automatically, reducing support costs

     -- Supports mobile/remote users who are intermittently connected to the 
        network

     -- Enables personalization, making it easy to deliver tailored 
        applications for each user

     -- Scales efficiently, supporting rapid increases in deployment size from 
        a limited number of users to large numbers of users worldwide

     -- Streamlines application rollout across multiple administrative domains

     -- Utilizes open standards and can integrate with existing business 
        processes
   
   
 
<PAGE>   91
 
                                      LOGO
 
     Until May 24, 1999, all dealers that buy, sell or trade our common stock,
whether or not participating in this offering, may be required to deliver a
prospectus. This is in addition to the dealers' obligation to deliver a
prospectus when acting as underwriters and with respect to their unsold
allotments or subscriptions.
 
     For investors outside the United States: Neither we nor any of the
underwriters have done anything that would permit this offering or possession or
distribution of this prospectus in any jurisdiction where action for that
purpose is required, other than in the United States. You are required to inform
yourselves about and to observe any restrictions relating to this offering and
the distribution of this prospectus.
 
     You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information different from that
contained in this prospectus. We are offering to sell, and seeking offers to
buy, shares of common stock only in jurisdictions where offers and sales are
permitted. The information contained in this prospectus is accurate only as of
the date of this prospectus, regardless of the time of delivery of the
prospectus or of any sale of the common stock.


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