RATIONAL SOFTWARE CORP
424A, 1996-10-04
PREPACKAGED SOFTWARE
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<PAGE>   1
 
     Information contained herein is subject to completion or amendment. A
     registration statement relating to these securities has been filed with the
     Securities and Exchange Commission. These securities may not be sold nor
     may offers to buy be accepted prior to the time the registration statement
     becomes effective. This prospectus shall not constitute an offer to sell or
     the solicitation of an offer to buy nor shall there be any sale of these
     securities in any State in which such offer, solicitation or sale would be
     unlawful prior to registration or qualification under the securities laws
     of any such State.
 
                  SUBJECT TO COMPLETION, DATED OCTOBER 3, 1996
 
PROSPECTUS
 
                                5,106,718 SHARES
 
                                      LOGO
 
                                  COMMON STOCK
 
     Of the 5,106,718 shares of Common Stock offered hereby, 4,150,000 shares
are being sold by Rational Software Corporation ("Rational" or the "Company")
and 956,718 shares are being sold by the Selling Stockholders. Such share
numbers reflect a two-for-one stock split effected on September 10, 1996. The
Company will not receive any of the proceeds from the sale of shares by the
Selling Stockholders. See "Principal and Selling Stockholders."
 
     The Company's Common Stock is quoted on the Nasdaq National Market under
the symbol RATL. On October 1, 1996, the last reported sale price of the Common
Stock was $35.50 per share. See "Price Range of Common Stock and Dividend
Policy."
                            ------------------------
 
            THE SHARES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK.
                    SEE "RISK FACTORS" COMMENCING ON PAGE 6.
                            ------------------------
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
  AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS
    THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
      COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
       ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
- -------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------
                                           PRICE TO      UNDERWRITING    PROCEEDS TO
                                            PUBLIC       DISCOUNT(1)      COMPANY(2)     PROCEEDS TO
                                                                                           SELLING
                                                                                         STOCKHOLDERS
- -------------------------------------------------------------------------------------------------------
<S>                                    <C>             <C>             <C>             <C>
Per Share..............................        $              $               $               $
- -------------------------------------------------------------------------------------------------------
Total(3)...............................        $              $               $               $
- -------------------------------------------------------------------------------------------------------
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) See "Underwriting" for indemnification arrangements with the several
     Underwriters.
 
(2) Before deducting expenses payable by the Company estimated at $675,000.
 
(3) The Company has granted to the Underwriters a 30-day option to purchase up
     to an additional 766,007 shares of Common Stock solely to cover
     over-allotments, if any. If all such shares are purchased, the total Price
     to Public, Underwriting Discount and Proceeds to Company will be
     $          , $          and $          , respectively. See "Underwriting."
                            ------------------------
 
     The Shares of Common Stock are offered by the several Underwriters subject
to prior sale, receipt and acceptance by them and subject to the right of the
Underwriters to reject any order in whole or in part and certain other
conditions. It is expected that certificates for such shares will be made
available for delivery on or about             , 1996, at the office of the
agent of Hambrecht & Quist LLC in New York, New York.
 
HAMBRECHT & QUIST
 
                      GOLDMAN, SACHS & CO.
 
                                         WESSELS, ARNOLD & HENDERSON
            , 1996
<PAGE>   2
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements and other information with the
Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information can be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Judiciary Plaza, Washington, D.C. 20549, and at the Commission's
following Regional Offices: Suite 1400, Northwest Atrium Center, 500 West
Madison Street, Chicago, Illinois 60661; and 13th Floor, Seven World Trade
Center, New York, New York 10048. Copies of such material can be obtained at
prescribed rates from the Public Reference Section of the Commission at 450
Fifth Street, N.W., Judiciary Plaza, Washington, D.C. 20549. The Company's
Common Stock is quoted for trading on the Nasdaq National Market and reports,
proxy statements and other information concerning the Company may also be
inspected at the offices of the National Association of Securities Dealers, 1735
K. Street, N.W., Washington, D.C. 20006.
 
     Additional information regarding the Company and the shares offered hereby
is contained in the Registration Statement on Form S-3 and the exhibits thereto
filed with the Commission under the Securities Act of 1933, as amended (the
"Securities Act"). For further information pertaining to the Company and the
shares, reference is made to the Registration Statement and the exhibits
thereto, which may be inspected without charge at, and copies thereof may be
obtained at prescribed rates from, the office of the Commission at 450 Fifth
Street, N.W., Judiciary Plaza, Washington, D.C. 20549.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     The Company's Annual Report on Form 10-K for the fiscal year ended March
31, 1996, as amended, the Company's Quarterly Report on Form 10-Q for the
quarter ended June 30, 1996, the Company's Form 8-K dated October 2, 1996 and
the Company's Form 8-K dated October 3, 1996 filed by the Company with the
Commission are hereby incorporated by reference in this Prospectus except as
superseded or modified herein. All documents filed by the Company with the
Commission pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act
after the date of this Prospectus and prior to the termination of the offering
of the shares offered hereby shall be deemed to be incorporated by reference
into this Prospectus and to be a part hereof from the date of filing of such
documents. Any statement contained in any document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any other subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed, except as modified or
superseded, to constitute a part of this Prospectus. The Company will provide
without charge to each person, including any beneficial owner, to whom this
Prospectus is delivered, upon written or oral request of such person, a copy of
any and all of the documents that have been or may be incorporated by reference
herein (other than exhibits to such documents which are not specifically
incorporated by reference into such documents). Such requests should be directed
to the Secretary at the Company's principal executive offices at 2800 San Tomas
Expressway, Santa Clara, California 95051-0951 (telephone (408) 496-3600).
 
     IN CONNECTION WITH THIS OFFERING, CERTAIN UNDERWRITERS AND SELLING GROUP
MEMBERS (IF ANY) OR THEIR RESPECTIVE AFFILIATES MAY ENGAGE IN PASSIVE MARKET
MAKING TRANSACTIONS IN THE COMMON STOCK ON THE NASDAQ NATIONAL MARKET IN
ACCORDANCE WITH RULE 10B-6A UNDER THE SECURITIES EXCHANGE ACT OF 1934. SEE
"UNDERWRITING."
 
     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE COMPANY AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NASDAQ NATIONAL MARKET, IN THE
OVER-THE-COUNTER MARKET OR OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE
DISCONTINUED AT ANY TIME.
 
     Rational(R), Rational Rose(R), SoDA(R), Verdix(R), VADS(R), Rational
Summit, Rational Apex, VADScross, Rational Approach and Rational Visual Test are
trademarks of the Company. Microsoft, Windows(R) 95, Windows(R) NT, Visual
Basic(R), Visual C++, Visual J++, Active X, BackOffice and Developer Studio are
trademarks of Microsoft Corporation. This Prospectus also includes trademarks of
companies other than the Company.
 
                                        2
<PAGE>   3
 
                               PROSPECTUS SUMMARY
 
     The following summary is qualified in its entirety by the more detailed
information and the Consolidated Financial Statements and Notes thereto
appearing elsewhere in this Prospectus. The Common Stock offered hereby involves
a high degree of risk. See "Risk Factors."
 
                                  THE COMPANY
 
     Rational Software Corporation ("Rational" or the "Company") develops,
markets and supports a comprehensive solution for the component-based
development of software systems. The Company's objective is to ensure the
success of customers in developing and managing software systems that are
strategically important to their businesses. Rational provides an integrated
family of tools that spans the critical phases of the software development
process from initial analysis and design through delivery and maintenance. In
addition, the Company provides technical consulting, training and support
services. By supporting controlled iterative development, visual modeling and an
architecture-driven process, Rational's products and services enable customers
to reduce the risk of project failure, improve the quality of the software
systems they develop, increase developer productivity, reduce time-to-market and
increase software reusability.
 
     Software permeates products and processes encountered in almost every
aspect of daily life, in areas as diverse as equity trading systems, inventory
management, telecommunications, military command-and-control systems, office
machinery and medical devices. Software development projects suffer from a high
rate of failure, resulting in project cancellation, substantial cost overruns or
significant delays to market. As organizations increasingly rely on
enterprise-wide information systems and seek competitive advantage through the
use of computer technology, a more effective approach to software development
becomes increasingly important.
 
     Component-based development offers a more effective approach to software
development. It builds on object-oriented programming, in which "objects" are
used as modular building blocks to model real-world processes. Component-based
development raises the level of abstraction and reduces the amount of source
code that must be created in connection with the development of a new software
system, leading to higher levels of re-use and greater return on investment than
previous techniques. The growing interest in and increasing usage of
component-based development is being driven by the growth of the Internet,
company-specific intranets and distributed multi-tier client/server systems, as
well as the widespread adoption of implementation languages such as Visual
Basic, Java, and related technologies such as CORBA and Microsoft's ActiveX.
Major software vendors, including Microsoft Corporation, Oracle Corporation,
Hewlett-Packard Company, Sun Microsystems, Inc. and Netscape Communications
Corp., have begun to use internally, and some have publicly endorsed, component-
based development.
 
     Visual modeling of software components and the relationships among them is
an essential element of using component-based development on a large scale. The
Company believes that its Unified Modeling Language ("UML") has become the de
facto standard language for visual modeling. The UML has been endorsed by
industry leaders Microsoft, Oracle and Hewlett-Packard.
 
     Rational provides products supporting component-based development.
Rational's product lines are Rational Rose, for visual modeling; Rational Apex,
for managing development teams and the components they generate; Rational
Summit, for software change management and process enforcement; and SoDA, for
automated documentation generation. In addition, the Company is adding Visual
Test to its product line for automated software testing on Windows 95 and
Windows NT.
 
     As of September 30, 1996, Rational has sold over 40,000 licenses of its
software products to over 2,500 customers worldwide. The Company's customers
build an extensive range of software including enterprise information systems,
packaged software products and systems used in telecommunications, financial
services, aerospace/defense and transportation. Representative customers include
Andersen Consulting, AT&T, British Telecom, LM Ericsson, Fidelity Investments,
IBM, Lockheed Martin,
 
                                        3
<PAGE>   4
 
MetLife, Microsoft, Rockwell-Collins, Smith Barney and Siemens. No single
customer accounted for 10% or more of revenues in fiscal 1996. International
sales represented approximately 36% of the Company's total revenue in fiscal
1996.
 
     The Company was incorporated in Delaware in 1982. The Company's executive
offices are located at 2800 San Tomas Expressway, Santa Clara, California
95051-0951, and its telephone number is (408) 496-3600. On September 10, 1996,
the Company effected a two-for-one stock split of its Common Stock by way of a
stock dividend (the "Stock Split").
 
                                 RECENT EVENTS
 
     On October 2, 1996, Rational and Microsoft announced the formation of a
business alliance which will consist of Rational's acquisition of Microsoft's
Visual Test product, technology cross-licensing, joint development projects and
joint marketing programs. As part of this arrangement, Rational has agreed to
develop a visual modeling product which includes selected elements of Rational
Rose for distribution in certain Microsoft development tools. Rational's
objective in forming this alliance with Microsoft is to extend the Company's
product line and to increase the use of component-based development by providing
visual modeling capabilities to developers using Microsoft's visual tools. In
addition, Rational believes that its arrangement with Microsoft will expose the
Company's technology to potential customers outside of its historical customer
base.
 
                                  THE OFFERING
 
<TABLE>
<S>                                                           <C>
Common Stock offered by the Company.........................  4,150,000 shares
Common Stock offered by the Selling Stockholders............  956,718 shares
Common Stock to be outstanding after the offering...........  38,641,973 shares(1)
Use of proceeds.............................................  Working capital, general
                                                              corporate purposes and
                                                              possible acquisitions
Nasdaq National Market symbol...............................  RATL
</TABLE>
 
- ------------------------------
(1) Based on the number of shares outstanding at September 30, 1996. Excludes
    4,930,729 shares of Common Stock reserved as of September 30, 1996 for
    issuance upon the exercise of outstanding options at a weighted average
    exercise price of $9.61 per share. Also excludes 1,994,958 shares reserved
    for future grant or issuance under the Company's stock option and stock
    purchase plans at September 30, 1996. See Note 9 of Notes to Consolidated
    Financial Statements.
 
                                        4
<PAGE>   5
 
                   SUMMARY CONSOLIDATED FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                      THREE MONTHS
                                                                                          ENDED
                                           FISCAL YEAR ENDED MARCH 31,                  JUNE 30,
                                 ------------------------------------------------   -----------------
                                  1992      1993       1994      1995      1996      1995      1996
                                 -------   -------   --------   -------   -------   -------   -------
                                                                                       (UNAUDITED)
<S>                              <C>       <C>       <C>        <C>       <C>       <C>       <C>
CONSOLIDATED STATEMENTS OF
  OPERATIONS DATA:
Net product revenue............  $38,161   $46,123   $ 41,716   $39,221   $55,899   $11,454   $17,300
Consulting and support
  revenue......................   22,168    24,880     28,627    33,678    35,208     8,303    10,161
          Total revenue........   60,329    71,003     70,343    72,899    91,107    19,757    27,461
Income (loss) from continuing
  operations(1)................   (1,065)   (2,163)   (13,807)    4,678    (4,021)    1,266     4,164
Net income (loss)(2)...........     (761)   (3,974)   (13,982)    4,678    (4,021)    1,266     4,164
Income (loss) from continuing
  operations per common
  share........................  $ (0.04)  $ (0.09)  $  (0.57)  $  0.19   $ (0.13)  $  0.04   $  0.11
Net income (loss) per common
  share(2).....................  $ (0.03)  $ (0.16)  $  (0.57)  $  0.19   $ (0.13)  $  0.04   $  0.11
Shares used in computing per
  share amounts(3).............   23,820    24,260     24,394    25,212    30,725    28,536    36,930
</TABLE>
 
<TABLE>
<CAPTION>
                                                                      QUARTER ENDED
                                                  -----------------------------------------------------
                                                  JUNE 30,   SEPT. 30,   DEC. 31,   MAR. 31,   JUNE 30,
                                                    1995       1995        1995       1996       1996
                                                  --------   ---------   --------   --------   --------
                                                                       (UNAUDITED)
<S>                                               <C>        <C>         <C>        <C>        <C>
Total revenue...................................  $ 19,757    $ 21,642   $ 24,004   $ 25,704   $ 27,461
Net income (loss)(4)............................     1,266       2,094    (11,163)     3,782      4,164
Net income (loss) per common share..............  $   0.04    $   0.06   $  (0.34)  $   0.12   $   0.11
Shares used in computing per share amounts(3)...    28,536      33,206     32,466     36,279     36,930
</TABLE>
 
<TABLE>
<CAPTION>
                                                                            JUNE 30, 1996
                                                                      --------------------------
                                                                      ACTUAL      AS ADJUSTED(5)
                                                                      -------     --------------
                                                                             (UNAUDITED)
<S>                                                                   <C>         <C>
CONSOLIDATED BALANCE SHEETS DATA:
  Cash, cash equivalents and short-term investments.................  $52,922        $192,206
  Working capital...................................................   51,386         190,670
  Total assets......................................................   84,797         224,081
  Long-term obligations.............................................    1,922           1,922
  Stockholders' equity..............................................   57,355         196,639
</TABLE>
 
- ------------------------------
(1) Amounts for 1993 and 1994 include merger and restructuring costs of
    $2,500,000 and $9,922,000, respectively. Amounts for 1995 include expense
    reversals of $1,100,000. Amounts for 1996 include $14,500,000 of one-time
    charges and operating expenses primarily associated with the Company's
    acquisition of Objectory AB and the subsequent restructuring and shaping of
    the Company's business, including an $8,700,000 write-off of acquired
    in-process research and development costs in connection with the
    acquisition. See "Management's Discussion and Analysis of Financial
    Condition and Results of Operations" and Notes 3 and 5 of Notes to
    Consolidated Financial Statements.
 
(2) Amounts for 1992, 1993 and 1994 include income (loss) from discontinued
    operations of $304,000, ($1,811,000) and ($175,000), respectively. See
    "Management's Discussion and Analysis of Financial Condition and Results of
    Operations" and Note 4 of Notes to Consolidated Financial Statements.
 
(3) Computed on the basis described in Note 1 of Notes to Consolidated Financial
    Statements.
 
(4) Amount for the quarter ended December 31, 1995 includes $14,500,000 of
    one-time charges and operating expenses primarily associated with the
    Company's acquisition of Objectory AB and the subsequent restructuring and
    shaping of the Company's business, including an $8,700,000 write-off of
    acquired in-process research and development costs in connection with the
    acquisition.
 
(5) Adjusted to give effect to the receipt of the net proceeds from the sale of
    4,150,000 shares of Common Stock offered by the Company hereby, at an
    assumed public offering price of $35.50 per share. See "Use of Proceeds."
 
     Except as otherwise noted, all figures presented in this Prospectus have
been restated to reflect the Stock Split. Except as otherwise noted, all
information in this Prospectus assumes no exercise of the Underwriters'
over-allotment option. See "Underwriting."
 
                                        5
<PAGE>   6
 
                                  RISK FACTORS
 
     This Prospectus contains forward-looking statements that involve risks and
uncertainties. Actual results could differ materially from those discussed in
the forward-looking statements as a result of certain factors, including those
set forth below and elsewhere in this Prospectus. The following risk factors
should be considered carefully in addition to the other information contained in
this Prospectus before purchasing the Common Stock offered hereby.
 
     Dependence Upon Market Growth and Development of Industry Standards.  The
Company's product lines are designed for use in visual modeling of business
processes, in the development of software systems and in the day-to-day
development of software by teams of developers. The Company's future growth and
financial performance will depend in part upon continued growth in the market
for tools supporting component-based development. There can be no assurance that
the market will continue to grow or that the Company will be able to respond
effectively to the evolving requirements of the market. In addition, the
Company's future growth and financial performance may depend upon the
development of industry standards that facilitate the adoption of
component-based development, as well as the Company's ability to play a leading
role in the establishment of those standards. The Company believes that the
Unified Modeling Language developed at Rational has become the de facto standard
language for visual modeling and intends to submit an application to the Object
Management Group ("OMG"), an industry consortium, for inclusion of the UML in
their Object Analysis and Design Facility specification. Competing standards,
including some that support the UML as well as other notations, also are
expected to be submitted to the OMG. The official sanction of a competing
standard by the OMG could have a material adverse effect on Rational's marketing
and sales efforts and, in turn, on revenues and operating results.
 
     The number of software developers using component-based development
technology is relatively small compared to the number of developers using more
traditional software development technology. The adoption of component-based
development technology by software programmers who have traditionally used other
technology requires re-orientation to significantly different programming
methods, and there can be no assurance that the acceptance of component-based
development technology will expand beyond sophisticated programmers who are
early adopters of the technology. Furthermore, there can be no assurance that
potential customers will be willing to make the investment required to retrain
programmers to build software using component-based development technology
rather than traditional programming techniques. Many of the Company's customers
have purchased only small quantities of the Company's tools, and there can be no
assurance that these or new customers will broadly implement component-based
development technology or purchase additional tools.
 
     Expansion of Product Lines.  The Company believes that its continued
success will depend in part upon its ability to provide a tightly integrated
line of software application development tools that support software development
for a number of implementation languages. This will require the Company to
enhance its current products and to continue to develop and introduce new
products. The Company also believes its continued success will become
increasingly dependent on its ability to support the Microsoft platform,
including Windows 95 and Windows NT. The Company believes that it will be
particularly important to successfully develop and market a broader line of
products for C++, Visual Basic, Java and other implementation languages in order
to be successful in its efforts to reach broader markets and to further increase
its market share within its existing market segments. There can be no assurance
that the Company will be able to successfully develop and market such a broad
line of products or that the Company will not encounter unexpected difficulties
and delays in integrating new products with existing product lines.
 
     Fluctuations in Operating Results.  The Company's revenue is difficult to
forecast due to the fact that the Company's sales cycle, from initial evaluation
to purchase, varies substantially from customer to customer. The Company
typically has operated with little backlog because software products are
generally shipped as orders are received. As a result, revenue in any quarter is
substantially dependent
 
                                        6
<PAGE>   7
 
on orders booked and shipped in that quarter. Because the Company's staffing and
operating expenses are based on anticipated revenue levels, and a high
percentage of the Company's costs are fixed, small variations in the timing of
the recognition of specific revenues could cause significant variations in
operating results from quarter to quarter. Historically, the Company has earned
a substantial portion of its revenues in the last weeks of the quarter. To the
extent this trend continues, the failure to achieve such revenues in the last
weeks of any given quarter will have a material adverse effect on the Company's
financial results for that quarter. Although the Company has experienced
increasing revenues in each of the past nine quarters, the Company's sales
compensation structure has historically resulted in revenues for the first
quarter of a fiscal year being lower than revenues for the fourth quarter of the
prior fiscal year. There can be no assurance that similar fluctuations will not
occur again in the future.
 
     The Company's earnings for the quarter ending December 31, 1996 will be
reduced by charges and operating expenses associated with the acquisition of the
Visual Test product, including an expected acquired in-process research and
development charge to operations of between $15 million and $19 million, as well
as increased marketing expenditures related to the promotion of the Visual Test
product. As a result, the Company will incur a significant net loss for the
quarter ending December 31, 1996, and may incur a net loss for fiscal 1997.
 
     The growth in revenues and operating income (exclusive of nonrecurring
operating, restructuring and merger-related expenses) experienced by the Company
in recent quarters is not necessarily indicative of future results and
period-to-period comparisons of its financial results should not be relied upon
as an indication of future performance. Fluctuations in operating results may
also result in volatility in the price of the Company's Common Stock. See
"-- Possible Volatility of Stock Price."
 
     Dependence Upon Revenues From New Products.  The Company plans to introduce
new products during fiscal 1997. Delay in the start of shipment of the Company's
new products would have an adverse effect on the Company's revenues, gross
profit and operating income. As a result of the Company's business alliance with
Microsoft, certain of the Company's new product releases are expected to be
tightly integrated with new releases of certain Microsoft products. To the
extent that scheduled Microsoft product releases are delayed, there could be a
material adverse effect on the Company's revenues from new products. The Company
attempts to make adequate allowances in its new product release schedules for
both internal and beta-site testing of product performance. Because of the
complexity of the Company's products, however, the release of new products may
be postponed should test results indicate the need for redesign and retesting,
or should the Company elect to add product enhancements in response to beta
customer feedback. The Company's sales remain sensitive to its existing and
prospective customers' budgeting practices and to potential cutbacks in defense
spending.
 
     Business Alliance with Microsoft.  On October 2, 1996, Rational and
Microsoft announced the formation of a business alliance which will consist of
Rational's acquisition of Microsoft's Visual Test product, technology
cross-licensing, joint development projects and joint marketing programs. While
the Company believes that Microsoft's current strategy in relation to the
enterprise information systems market is based on component-based development,
there can be no assurance that this strategy will continue or that, if it does
continue, Microsoft's emphasis or priorities will not change in the future,
resulting in less attention and fewer resources being devoted to Microsoft's
relationship with Rational. Although certain aspects of the business alliance
are contractual in nature, many important aspects of the relationship depend on
the continued cooperation of the two companies, and there can be no assurance
that the Company and Microsoft will be able to work together successfully over
an extended period of time. In addition, there can be no assurance that
Microsoft will not use the information it gains in its relationship with
Rational to develop or market competing products. See "Business -- Business
Alliance with Microsoft."
 
     Acquisition of the Visual Test Product.  The Company acquired the Visual
Test product from Microsoft on October 2, 1996. There can be no assurance that
Rational will be able to successfully incorporate Visual Test into its
integrated family of products, or that it will be able to achieve
 
                                        7
<PAGE>   8
 
significant sales of the Visual Test product. Many potential customers for
Visual Test differ from the Company's historical customer base in terms of
component-based software development expertise, purchasing processes, financial
resources and expectations regarding software-engineering tools. There can be no
assurance that the Company will not encounter unanticipated concerns of Visual
Test customers that are different from the concerns of the Company's traditional
customers, or that the Company will have the infrastructure and experience
necessary to adequately respond to the volume and type of such concerns.
 
     Rational has granted Microsoft a non-exclusive, perpetual license to the
Visual Test product source code for the purpose of creating derivative works and
for the purpose of distributing portions of the Visual Test product and
derivative works as part of Microsoft products that do not directly compete with
the Visual Test product in the market for software testing tools. There can be
no assurance that Microsoft will not use such rights to create and distribute
products that compete with Rational in other segments of the component-based
development tools market. Rational has also granted Microsoft the option to
obtain a license to incorporate certain elements of Visual Test technology into
Microsoft development tool products, including Visual Basic, Visual C++ and
Visual J++. Should Microsoft exercise such right, sales of the Visual Test
product by Rational could be materially and adversely impacted.
See "-- Fluctuations in Operating Results," "Business -- Products and
Services -- Visual Test: Software Testing Automation Tools" and "-- Business
Alliance with Microsoft."
 
     Licensing of Rose Technology to Microsoft.  Microsoft and Rational have
entered into an agreement providing for the inclusion of a subset of the
Rational Rose visual modeling technology in future versions of Microsoft's
enterprise-oriented visual tools. The Company's objective in entering into this
arrangement is to expose the Company's technology to a broader market than
Rational's historical customer base. The Company expects that changes in the
Company's pricing models and combinations of features within product lines will
be required to appeal to this market, and there can be no assurance that such
changes will achieve market acceptance. Rational does not expect the licensing
of its Rose technology to Microsoft to directly result in a material increase in
product revenue. In addition, there can be no assurance that developers
introduced to the Rose technology incorporated into Microsoft products will
become purchasers of Rational products in the future. Rational has granted
Microsoft the option to obtain a perpetual, non-exclusive right to source code
for certain aspects of Rational's Rose technology after the expiration of the
agreement. While Rational believes that Microsoft's and Rational's strategies
currently are complementary, there can be no assurance that Microsoft will not
use this right to develop and market competing products in the future. See
"Business -- Business Alliance with Microsoft."
 
     Adverse Impact of Promotional Product Versions on Actual Product
Sales.  The Company's marketing strategy relies in part on making elements of
its technology available for no charge or at a very low price, either directly
or by incorporating such elements into products offered by the Company's
partners, such as Microsoft. This strategy is designed to expose the Company's
products to a broader market than its historical customer base, and to encourage
potential customers in that market to purchase an upgrade or other higher-priced
product from the Company. There can be no assurance that the Company will be
able to introduce enhancements to its full-price products or versions of its
products with intermediate functionality at a rate necessary to adequately
differentiate them from the promotional versions, particularly in cases where
the Company's partners are distributing versions of the Company's products with
other desirable features.
 
     Management of Growth.  The Company is experiencing a period of rapid growth
and aggressive product introductions that have placed, and may continue to
place, a significant strain on its resources, including its personnel. Projects
such as the expansion of the Company's product lines, efforts to address broader
markets and to expand distribution channels, acquisitions of companies or
technologies such as the recent acquisitions of Objectory AB and the Visual Test
product, and business alliances such as the recent arrangement with Microsoft,
when added to the day-to-day activities of the Company, will place a further
strain on the Company's resources and personnel. The Company believes that the
hiring and retaining of qualified individuals at all levels in the Company is
essential to
 
                                        8
<PAGE>   9
 
the Company's ability to manage growth successfully, and there can be no
assurance that the Company will be successful in attracting and retaining the
necessary personnel. If Company management is unable to effectively manage
growth, the Company's business, competitive position, results of operations and
financial condition will be materially and adversely affected.
 
     Risks Associated With Recent and Future Acquisitions.  During the past two
years the Company has made a number of strategic acquisitions. Acquisitions by
the Company may result in the diversion of management's attention from the
day-to-day operations of the Company's business and may include numerous other
risks, including difficulties in the integration of operations, products and
personnel. To the extent that efforts to integrate recent and future
acquisitions fail, there could be a material adverse effect on results of
operations. Acquisitions by the Company have the potential to result in dilutive
issuances of equity securities, the incurrence of additional debt, and
amortization expenses related to goodwill and other intangible assets. While
there are currently no commitments with respect to any particular future
acquisitions, Company management frequently evaluates the strategic
opportunities available to it and may in the near-term or long-term future
pursue acquisitions of complementary products, technologies or businesses.
 
     Dependence on Strategic Relationships.  The Company's development,
marketing and distribution strategies rely increasingly on the Company's ability
to form long-term strategic relationships with major software and hardware
vendors, many of whom are substantially larger than the Company. Divergence in
strategy between the Company and any given partner, or a change in focus by a
given partner, may interfere with the Company's ability to develop, market, sell
or support its products. See "-- Business Alliance with Microsoft."
 
     Rapid Technological Change.  The market for software development tools is
characterized by rapid technological advances, changes in customer requirements
and frequent new product introductions and enhancements. The Company must
respond rapidly to developments related to hardware platforms, operating systems
and applicable programming languages. Such developments will require the Company
to make substantial product development investments. Any failure by the Company
to anticipate or respond adequately to technology developments and customer
requirements, or any significant delays in product development or introduction,
could result in a loss of competitiveness or revenue. In addition, there can be
no assurance that new products or product enhancements intended to respond to
technological change or evolving customer requirements will achieve market
acceptance.
 
     Risk of Software Defects.  Software products like those sold by the Company
often contain undetected errors, or "bugs," or performance problems. Such
defects are most frequently found during the period immediately following
introduction of new products or enhancements to existing products. Despite
extensive product testing prior to introduction, the Company's products have in
the past contained software errors that were discovered after commercial
introduction. There can be no assurance that errors or performance problems will
not be discovered in the future. Any future software defects discovered after
shipment of the Company's products could result in loss of revenues or delays in
market acceptance, which could have a material adverse effect on the Company's
business, operating results or financial condition.
 
     Competition.  The software engineering tools market is extremely
competitive and rapidly changing. The Company believes that the increased level
of competition it observed in fiscal 1996 and the first half of fiscal 1997 will
continue to increase. The Company competes primarily on the bases of corporate
and product reputation, breadth of its integrated product line, product
architecture, functionality and features, product quality, performance,
ease-of-use, quality of support, availability of technical consulting services
and price. The Company faces intense competition for each product within its
product line. Because individual product sales are often the first step in a
broader customer relationship, the Company's success depends in part upon its
ability to successfully compete with numerous competitors at each point within
its product line. Certain of the Company's competitors are more experienced than
the Company in the development of software-engineering tools, databases or
 
                                        9
<PAGE>   10
 
software-development products. Some of the Company's competitors have, and new
competitors may have larger technical staffs, more established distribution
channels and greater financial resources than the Company. The Company also
encounters substantial competition from in-house developers of solutions for
large organizations. There can be no assurance that either existing or new
competitors will not develop products that are superior to the Company's
products or that achieve greater market acceptance. The Company's future success
will depend in large part upon its ability to increase its share of its target
markets and to license additional products and product enhancements to existing
customers. There can be no assurance that future competition will not have a
material adverse effect on the Company's results of operations. See
"Business -- Competition."
 
     Dependence on Sales Force and Other Channels of Distribution.  The Company
currently distributes its products primarily through field sales personnel
teamed with highly trained technical support personnel. The Company believes
that a high level of technical consulting, training and customer support is
essential to maintaining its competitive position, and has found that the
ability to deliver a high level of technical consulting, training and customer
support is an important selling point with respect to its products. While
complementary to the Company's products, the services provided by these
personnel have historically yielded lower margins for the Company than its
product business. To the extent that these services constitute a higher
proportion of total revenues in the future, the Company's margins will be
adversely affected. The Company has also developed other direct and indirect
sales channels, including telesales, the World Wide Web, and partnering with
external service providers and VARs. There can be no assurance that such
channels will be successful in increasing sales of the Company's products or in
reducing the Company's sales costs on a percentage basis.
 
     Dependence on Key Personnel.  The Company is dependent upon the efforts and
abilities of a number of key management, sales, product development, support and
technical personnel. The success of the Company depends to a large extent upon
its ability to retain and continue to attract key employees. The rate at which
the Company can attract and retain the highly trained technical personnel that
are integral to its direct sales teams may limit the rate at which the Company
can increase sales. Competition for qualified personnel in the software industry
is intense, and there can be no assurance that the Company will be successful in
attracting and retaining such personnel. See "Business -- Employees" and
"Management -- Directors and Executive Officers."
 
     Risks Associated with International Operations.  International sales
accounted for approximately 31%, 34% and 36% of the Company's revenues in fiscal
1994, 1995 and 1996, respectively, and the Company expects that international
sales will continue to account for a significant portion of the Company's
revenues in future periods. In addition, the Company expects that the majority
of Visual Test product sales will come from outside the United States.
International sales are subject to inherent risks, including unexpected changes
in regulatory requirements and tariffs, difficulties in staffing and managing
foreign operations, longer payment cycles, greater difficulty in accounts
receivable collection, potentially adverse tax consequences, price controls or
other restrictions on foreign currency and difficulties in obtaining export and
import licenses. Any material adverse effect on the Company's international
business would be likely to materially and adversely affect the Company's
business, operating results and financial condition as a whole. The Company's
international sales are generally denominated in foreign currencies. Gains and
losses on the conversion of foreign payments into U.S. dollars may contribute to
fluctuations in the Company's results of operations. Although the Company has
not experienced any material adverse impact to date from fluctuations in foreign
currencies, there can be no assurance that the Company will not experience a
material adverse impact on its financial condition and results of operations
from fluctuations in foreign currencies in the future. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations."
 
     Limited Protection of Intellectual Property and Proprietary Rights.  The
Company regards its software as proprietary and attempts to protect it with a
combination of copyright, trademark and trade secret laws, employee and
third-party nondisclosure agreements and other methods of protection. Despite
these precautions, it may be possible for unauthorized third parties to copy
certain portions of the Company's products or reverse engineer or obtain and use
information the Company
 
                                       10
<PAGE>   11
 
regards as proprietary. The Company's software products are generally licensed
to end-users on a "right to use" basis pursuant to a perpetual license. The
Company licenses its products primarily under "shrink-wrap" licenses (i.e.,
licenses included as part of the product packaging). Shrink-wrap licenses are
not negotiated with or signed by individual licensees, and purport to take
effect upon the opening of the product package. Certain license provisions
protecting against unauthorized use, copying, transfer and disclosure of the
licensed program may be unenforceable under the laws of certain jurisdictions
and foreign countries. In addition, the laws of some foreign countries do not
protect proprietary rights to the same extent as do the laws of the United
States. There can be no assurance that these protections will be adequate. To
the extent that the Company increases its international activities, it expects
that its exposure to unauthorized copying and use of its products and
proprietary information will increase.
 
     The status of United States patent protection in the software industry is
not well defined and will evolve as the United States Patent and Trademark
Office grants additional patents. Because patent applications in the United
States are not publicly disclosed until the patent is issued, applications may
have been filed which would relate to the Company's products. There can be no
assurance that third parties will not assert infringement claims against the
Company in the future or that such claims will not be successful. The Company
could incur substantial costs in defending itself and its customers against any
such claims. Parties making such claims may be able to obtain injunctive or
other equitable relief that could effectively block the Company's ability to
sell its products in the United States and abroad, and could result in an award
of substantial damages. In the event of a claim of infringement, the Company and
its customers may be required to obtain one or more licenses from third parties.
There can be no assurance that the Company or its customers could obtain
necessary licenses from third parties at a reasonable cost or at all. Defense of
any lawsuit or failure to obtain any such required license would have a material
adverse effect on the Company's results of operations. See
"Business -- Intellectual Property."
 
     Possible Volatility of Stock Price.  The market price of the Company's
Common Stock has been, and is likely to continue to be, volatile. Factors such
as new product announcements or changes in product pricing policies by the
Company or its competitors, quarterly fluctuations in the Company's operating
results, announcements of technical innovations, announcements relating to
strategic relationships or acquisitions, changes in earnings estimates by
analysts and general conditions in the component-based software development
market, among other factors, may have a significant impact on the market price
of the Company's Common Stock. Should the Company fail to introduce products on
the schedule expected, the Company's stock price could be adversely affected. In
addition, in recent years the stock market in general, and the shares of
technology companies in particular, have experienced extreme price fluctuations.
This volatility has had a substantial effect on the market prices of securities
issued by many companies for reasons unrelated to the operating performance of
the specific companies. These broad market fluctuations may adversely affect the
market price of the Company's Common Stock. See "-- Fluctuations in Operating
Results" and "-- Dependence Upon Revenues From New Products."
 
     Shares Eligible for Future Sale.  Other than approximately 700,000 shares
subject to a lock-up expiring 90 days after effectiveness of the offering made
hereby and certain shares of affiliates subject to volume limitations on resale,
substantially all of the shares of the Company's Common Stock outstanding
following this offering will be freely tradeable. Sales of substantial amounts
of Common Stock in the public market after this offering could adversely affect
the prevailing market price of the Common Stock.
 
     Forward-Looking Statements.  This Prospectus contains forward-looking
statements, which may be deemed to include the Company's plans with respect to
product developments and introductions, domestic and international marketing
efforts, and strategic relationships, as well as the Company's expectations
concerning market trends. Actual results and actions taken by the Company could
differ from those projected in any forward-looking statements for a number of
reasons, including those detailed in the other sections of this "Risk Factors"
portion of the Prospectus, or elsewhere in this Prospectus.
 
                                       11
<PAGE>   12
 
                                USE OF PROCEEDS
 
     The net proceeds to the Company from the sale of the 4,150,000 shares of
Common Stock offered by the Company hereby, at an assumed public offering price
of $35.50 per share, are estimated to be $139,283,750 ($165,117,336 if the
Underwriters' over-allotment option is exercised in full), after deducting the
estimated underwriting discounts and commissions and estimated offering expenses
payable by the Company. The Company will not receive any proceeds from the sale
of Common Stock by the Selling Stockholders. See "Principal and Selling
Stockholders."
 
     The proceeds to the Company from the offering will be used for working
capital and general corporate purposes. A portion of the proceeds may also be
used for investment in or acquisition of complementary products, technologies or
businesses. As of the date hereof, the Company has no commitments with respect
to any specific acquisition. The consummation of future acquisitions will be
subject to, among other things, favorable market conditions, the availability of
financing on terms and conditions satisfactory to the Company, and suitable
acquisition candidates. Pending such uses, the net proceeds will be invested in
investment-grade, interest-bearing securities.
 
                PRICE RANGE OF COMMON STOCK AND DIVIDEND POLICY
 
     The Company's Common Stock is traded on the Nasdaq National Market under
the symbol RATL. The following table sets forth for the periods indicated the
high and low sale price for the Common Stock. All prices have been adjusted to
give effect to the Stock Split.
 
<TABLE>
<CAPTION>
FISCAL YEAR                                                               HIGH       LOW
- -----------                                                              ------     ------
<C>           <S>                                                        <C>        <C>
    1997      2nd Quarter............................................    $36.00     $17.50
              1st Quarter............................................     33.13      19.00
    1996
              4th Quarter............................................     20.75       7.94
              3rd Quarter............................................     12.00       6.82
              2nd Quarter............................................      9.32       6.57
              1st Quarter............................................      6.10       5.25
    1995
              4th Quarter............................................      6.00       3.57
              3rd Quarter............................................      4.03       2.82
              2nd Quarter............................................      3.94       2.07
              1st Quarter............................................      4.69       2.07
</TABLE>
 
     On October 1, 1996, the last reported sale price for the Company's Common
Stock was $35.50 per share. As of September 30, 1996, there were 792 holders of
record of Common Stock.
 
     The Company has not paid any cash dividends since its inception and does
not anticipate paying cash dividends in the foreseeable future. The Company
currently intends to retain available future earnings to finance the operations
of its business.
 
                                       12
<PAGE>   13
 
                                 CAPITALIZATION
 
     The following table sets forth the capitalization of the Company at June
30, 1996, and as adjusted to give effect to the receipt by the Company of the
net proceeds from the sale of 4,150,000 shares of Common Stock offered hereby at
an assumed public offering price of $35.50 per share. The financial data in the
following table should be read in conjunction with the Company's unaudited
Consolidated Financial Statements and Notes thereto at June 30, 1996 contained
in this Prospectus or incorporated by reference herein.
 
<TABLE>
<CAPTION>
                                                                            JUNE 30, 1996
                                                                     ---------------------------
                                                                      ACTUAL      AS ADJUSTED(1)
                                                                     --------     --------------
                                                                           (IN THOUSANDS)
<S>                                                                  <C>          <C>
Long-term obligations..............................................  $  1,922        $  1,922
Stockholders' equity:
  Common Stock, $.01 par value, 75,000,000 shares authorized;
     34,441,700 shares issued and outstanding; 38,591,700 shares
     issued and outstanding as adjusted(2).........................       344             386
  Additional paid-in capital.......................................   116,302         255,544
  Treasury stock...................................................    (1,340)         (1,340)
  Accumulated deficit..............................................   (57,831)        (57,831)
  Cumulative translation adjustment................................      (120)           (120)
                                                                     --------        --------
     Total stockholders' equity....................................    57,355         196,639
                                                                     --------        --------
     Total capitalization..........................................  $ 59,277        $198,561
                                                                     ========        ========
</TABLE>
 
- ------------------------------
(1) Excludes 4,263,674 shares of Common Stock reserved as of June 30, 1996 for
    issuance upon the exercise of outstanding options at a weighted average
    exercise price of $4.64 per share. Also excludes 619,682 shares reserved for
    future grant or issuance at June 30, 1996 under the Company's stock option
    and stock purchase plans. See Note 9 of Notes to Consolidated Financial
    Statements. At September 30, 1996, 4,930,729 shares of Common Stock were
    reserved for issuance upon the exercise of outstanding options at a weighted
    average exercise price of $9.61 per share, and 1,994,958 shares were
    reserved for future grant or issuance under the Company's stock option and
    stock purchase plans.
 
(2) The number of shares authorized reflects the increase in the number of
    shares authorized in August 1996. See Note 11 of Notes to Consolidated
    Financial Statements.
 
                                       13
<PAGE>   14
 
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
     The selected consolidated statements of operations data set forth below for
the years ended March 31, 1994, 1995 and 1996, and the consolidated balance
sheets data at March 31, 1995 and 1996 are derived from, and are qualified by
reference to, the Consolidated Financial Statements which were audited by Ernst
& Young LLP and are included elsewhere in this Prospectus. The consolidated
statements of operations data for the three months ended June 30, 1995 and 1996,
and the consolidated balance sheets data at June 30, 1996, are derived from
unaudited financial statements included elsewhere in this Prospectus and
include, in the opinion of management, all adjustments (consisting only of
normal recurring adjustments) necessary for a fair presentation of the financial
position and results of operations of the Company for such periods. The
consolidated statements of operations data for the years ended March 31, 1992
and 1993 and the consolidated balance sheets data at March 31, 1992, 1993 and
1994 are derived from the Company's audited consolidated financial statements
not included in this Prospectus. The results for the year ended March 31, 1996
and the three-month period ended June 30, 1996 are not necessarily indicative of
the results to be expected for the entire year ending March 31, 1997 or any
future period. The information presented below should be read in conjunction
with the Company's Consolidated Financial Statements, Notes thereto and
discussions thereof included elsewhere in this Prospectus.
 
<TABLE>
<CAPTION>
                                                                                                                  THREE MONTHS
                                                                                                                     ENDED
                                                                   FISCAL YEAR ENDED MARCH 31,                      JUNE 30,
                                                       ----------------------------------------------------    ------------------
                                                        1992       1993        1994       1995       1996       1995       1996
                                                       -------    -------    --------    -------    -------    -------    -------
                                                                         (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                    <C>        <C>        <C>         <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENTS OF OPERATIONS DATA:
Net product revenue................................... $38,161    $46,123    $ 41,716    $39,221    $55,899    $11,454    $17,300
Consulting and support revenue........................  22,168     24,880      28,627     33,678     35,208      8,303     10,161
                                                       -------    -------    --------    -------    -------    -------    -------
    Total revenue.....................................  60,329     71,003      70,343     72,899     91,107     19,757     27,461
                                                       -------    -------    --------    -------    -------    -------    -------
Cost of product revenue...............................  10,057     10,268      11,862      6,955      7,196      1,250      1,825
Cost of consulting and support revenue................  10,807     11,291      13,494     18,095     19,336      4,763      5,499
                                                       -------    -------    --------    -------    -------    -------    -------
    Total cost of revenue.............................  20,864     21,559      25,356     25,050     26,532      6,013      7,324
                                                       -------    -------    --------    -------    -------    -------    -------
    Gross profit......................................  39,465     49,444      44,987     47,849     64,575     13,744     20,137
Operating expenses:
Research and development..............................  17,834     18,986      20,221     12,187     15,939      3,171      4,495
Sales and marketing...................................  17,564     21,652      21,338     25,100     35,000      7,666      8,877
General and administrative............................   5,597      7,510       7,194      6,995      9,511      1,711      2,399
Charges for acquired in-process research and
  development.........................................      --         --          --         --      8,700         --         --
Merger and restructuring costs........................      --      2,500       9,922     (1,100)        --         --         --
                                                       -------    -------    --------    -------    -------    -------    -------
    Total operating expenses..........................  40,995     50,648      58,675     43,182     69,150     12,548     15,771
    Income (loss) from continuing operations..........  (1,530)    (1,204)    (13,688)     4,667     (4,575)     1,196      4,366
Other income, net.....................................     981        545         285        417      1,582        180        533
                                                       -------    -------    --------    -------    -------    -------    -------
    Income (loss) from continuing operations before
      provision for income taxes......................    (549)      (659)    (13,403)     5,084     (2,993)     1,376      4,899
Provision for income taxes............................     516      1,504         404        406      1,028        110        735
                                                       -------    -------    --------    -------    -------    -------    -------
    Income (loss) from continuing operations..........  (1,065)    (2,163)    (13,807)     4,678     (4,021)     1,266      4,164
Discontinued operations:
    Income (loss) from discontinued operations........     304     (1,515)         --         --         --         --         --
    Loss on disposal..................................      --       (296)       (175)        --         --         --         --
                                                       -------    -------    --------    -------    -------    -------    -------
Net income (loss)..................................... $  (761)   $(3,974)   $(13,982)   $ 4,678    $(4,021)   $ 1,266    $ 4,164
                                                       =======    =======    ========    =======    =======    =======    =======
Income (loss) from continuing operations per common
  share............................................... $ (0.04)   $ (0.09)   $  (0.57)   $  0.19    $ (0.13)   $  0.04    $  0.11
Net income (loss) per common share.................... $ (0.03)   $ (0.16)   $  (0.57)   $  0.19    $ (0.13)   $  0.04    $  0.11
Shares used in computing per share amounts............  23,820     24,260      24,394     25,212     30,725     28,536     36,930
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                     MARCH 31,
                                                                  -----------------------------------------------
                                                                   1992      1993      1994      1995      1996
                                                                  -------   -------   -------   -------   -------   JUNE 30, 1996
                                                                                  (IN THOUSANDS)                    -------------
<S>                                                               <C>       <C>       <C>       <C>       <C>       <C>
CONSOLIDATED BALANCE SHEETS DATA:
Cash, cash equivalents and short-term investments...............  $21,904   $14,945   $13,687   $10,476   $52,645     $  52,922
Working capital.................................................   22,438    22,921     4,972     7,742    45,548        51,386
Total assets....................................................   53,727    50,836    39,343    38,000    85,674        84,797
Long-term obligations...........................................    5,392     5,683     7,809     3,675     2,189         1,922
Stockholders' equity............................................   28,489    27,045     6,487    12,084    50,906        57,355
</TABLE>
 
     The amounts presented above have been restated to reflect the Stock Split.
See "Management's Discussion and Analysis of Financial Condition and Results of
Operations."
 
                                       14
<PAGE>   15
 
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The statements contained in Management's Discussion and Analysis of
Financial Condition and Results of Operations include "forward-looking"
information within the meaning of Section 27A of the Securities Act of 1933 and
21E of the Securities Exchange Act of 1934, as amended, and are subject to the
safe harbor created by those sections. The actual future results of the Company
could differ materially from those projected in the forward-looking information.
Some factors that could cause future actual results to differ materially from
the Company's recent results or those projected in the forward-looking
information are discussed elsewhere in this Prospectus. See "Risk Factors." The
Company assumes no obligation to update the forward-looking information or such
factors.
 
OVERVIEW
 
     The Company's revenue is derived from product license fees and charges for
services, including technical consulting, training and customer support. In
accordance with generally accepted accounting principles, the Company recognizes
software license revenue upon shipment and recognizes customer-support revenue
over the term of the maintenance agreement. Revenue from consulting and training
is recognized when earned. The Company's license agreements generally do not
provide a right of return, and reserves are maintained for potential credit
losses, of which there have been only immaterial amounts.
 
     On October 2, 1996, the Company and Microsoft announced the formation of a
business alliance that will consist of Rational's acquisition of Microsoft's
Visual Test product, technology cross-licensing, joint development projects and
joint marketing programs. The purchase price of the Visual Test product
consisted of a single $23 million cash payment, which will be accounted for
using the purchase method. The Company's operating results for the quarter
ending December 31, 1996 will be reduced by charges and operating expenses
associated with the acquisition of the Visual Test product, including an
expected charge to operations for acquired in-process research and development
of between $15 million and $19 million, as well as increased marketing
expenditures related to the promotion of the Visual Test product. As a result,
the Company will incur a significant net loss for the quarter ending December
31, 1996, and may incur a net loss for fiscal 1997. Amounts attributed to other
purchased intangible assets will be amortized to operations over their estimated
useful lives, which in most cases are two to four years. The Company does not
expect the cross-licensing arrangements to directly result in a material
increase in product revenue. See "Risk Factors -- Business Alliance with
Microsoft," "-- Acquisition of the Visual Test Product," "-- Licensing of Rose
Technology to Microsoft," and "Business -- Business Alliance with Microsoft."
 
     In October 1995, the Company signed a definitive agreement to purchase all
the outstanding stock of Objectory AB, a Swedish software development company,
in exchange for 1,496,718 shares of Common Stock. The acquisition was accounted
for using the purchase method and, accordingly, the operating results of
Objectory AB are included in the consolidated results of the Company from the
date of acquisition. In addition, in the third quarter of fiscal 1996, the
Company incurred approximately $14.5 million of one-time charges and operating
expenses primarily associated with the Company's acquisition of Objectory AB and
the subsequent restructuring and shaping of the Company's business, including an
$8.7 million write-off of acquired in-process research and development costs in
connection with the Objectory AB acquisition. See Note 3 of Notes to
Consolidated Financial Statements.
 
     On March 31, 1994, the Company, a publicly traded corporation formerly
known as Verdix Corporation, completed the merger with Rational, a privately
held corporation, and changed its name to Rational Software Corporation. The
transaction was accounted for as a pooling-of-interests business combination and
involved the issuance of approximately 14.3 million additional shares of Common
Stock. Merger-related expenses of $9.9 million were recorded in fiscal 1994 as a
result of the closing of facilities, severance costs, administrative costs and
the write-off of capitalized software costs related to overlapping product
lines. Fiscal 1995 results reflected expense reductions of $1.1 million relating
to
 
                                       15
<PAGE>   16
 
the reversal of fiscal 1994 rent accrual adjustments associated with the closing
of facilities. The remaining facilities accrual is $1,706,000 at June 30, 1996.
See Notes 3 and 5 of Notes to Consolidated Financial Statements.
 
     International sales accounted for 31%, 34% and 36% of the Company's
revenues in fiscal 1994, 1995 and 1996, respectively, and the Company expects
that international sales will continue to account for a significant portion of
the Company's revenues in future periods. See "Risk Factors -- Risks Associated
with International Operations."
 
     In recent periods, the Company's revenues from consulting and support have
grown at a slower rate than revenues from product sales, contributing to
increasing gross margins. There can be no assurance that this trend will
continue in future periods. See "Risk Factors -- Dependence Upon Revenues From
New Products" and "-- Dependence on Sales Force and Other Channels of
Distribution."
 
     Although the Company has experienced increasing revenues in each of the
past nine quarters, the Company's sales compensation structure has historically
contributed to revenues for the first quarter of a fiscal year being lower than
revenues for the fourth quarter of the prior fiscal year. There can be no
assurance that the Company will continue to experience increasing revenues or
that similar fluctuations will not occur again in the future. See "Risk
Factors -- Fluctuations in Operating Results" and "-- Dependence Upon Revenues
From New Products."
 
RESULTS OF OPERATIONS
 
     The following table sets forth for the periods indicated the percentage of
total revenue represented by certain line items from the Company's Consolidated
Statements of Operations:
 
<TABLE>
<CAPTION>
                                                                                       THREE MONTHS
                                                                 FISCAL YEAR               ENDED
                                                               ENDED MARCH 31,           JUNE 30,
                                                            ----------------------     -------------
                                                            1994     1995     1996     1995     1996
                                                            ----     ----     ----     ----     ----
<S>                                                         <C>      <C>      <C>      <C>      <C>
Net product revenue.......................................   59 %     54 %     61 %     58 %     63 %
Consulting and support revenue............................   41       46       39       42       37
                                                            ---      ---      ---      ---      ---
  Total revenue...........................................  100      100      100      100      100
Cost of product revenue...................................   17        9        8        6        7
Cost of consulting and support revenue....................   19       25       21       24       20
                                                            ---      ---      ---      ---      ---
  Total cost of revenue...................................   36       34       29       30       27
                                                            ---      ---      ---      ---      ---
  Gross profit............................................   64       66       71       70       73
Operating expenses:
Research and development..................................   29       17       17       16       16
Sales and marketing.......................................   30       34       38       39       32
General and administrative................................   10       10       11        9        9
Charges for acquired in-process research and
  development.............................................   --       --       10       --       --
Merger and restructuring costs............................   14       (1 )     --       --       --
                                                            ---      ---      ---      ---      ---
  Total operating expenses................................   83       60       76       64       57
                                                            ---      ---      ---      ---      ---
  Income (loss) from continuing operations................  (19 )      6       (5 )      6       16
Other income, net(1)......................................   --        1        2        1        2
                                                            ---      ---      ---      ---      ---
  Income (loss) before provision for income taxes.........  (19 )      7       (3 )      7       18
  Provision for income taxes..............................    1        1        1        1        3
                                                            ---      ---      ---      ---      ---
Net income (loss).........................................  (20 )%     6 %     (4 )%     6 %     15 %
                                                            ===      ===      ===      ===      ===
</TABLE>
 
- ------------------------------
(1) Amount for 1994 includes a loss from discontinued operations of $175,000.
    See Note 4 of Notes to Consolidated Financial Statements.
 
                                       16
<PAGE>   17
 
THREE MONTHS ENDED JUNE 30, 1996 AND 1995
 
  Revenue
 
     Total revenue increased $7,704,000 (39.0%) in the three-month period ended
June 30, 1996 from the comparable fiscal 1996 period. Net product revenue
increased by $5,846,000 (51.0%) in the fiscal 1997 period versus the same fiscal
1996 period. The increase is primarily due to continued strength across the
Company's product lines. Consulting and support revenue increased $1,858,000
(22.4%) in the fiscal 1997 three-month period versus the same fiscal 1996
period. The increase is primarily attributable to continuing demand for the
Company's consulting expertise in object-oriented software development and
business process engineering.
 
  Cost of Revenue; Gross Margin
 
     Cost of product revenue.  Cost of product revenue consists principally of
materials, packaging and freight, and amortization of capitalized software costs
and royalties. Cost of product revenue, expressed as a percentage of the related
revenue, was 10.5% for the three-month period of fiscal 1997 compared to 10.9%
for the same period of fiscal 1996. The decrease in cost as a percentage is
primarily due to lower royalty expense resulting from a decrease in third-party
product sales.
 
     Cost of consulting and support revenue.  Cost of consulting and support
revenue consists principally of personnel costs for training, consulting and
customer support. As a percentage of the related revenue, cost of consulting and
support revenue decreased from 57.4% in fiscal 1996 to 54.1% in fiscal 1997 for
the three-month period. The decrease in cost as a percentage is primarily due to
more efficient management of the Company's consulting resources, combined with
the impact of an underlying relatively fixed support cost base being spread over
increased revenues.
 
     The Company's gross margin for the three month period increased to 73.3% in
fiscal 1997 from 69.6% in fiscal 1996 as a result of the shift towards product
sales, which have higher margins than consulting and support revenue.
 
  Operating Expenses
 
     Research and development.  Product research and development expenses
increased $1,324,000 (41.8%) in the fiscal 1997 three-month period versus the
same fiscal 1996 period. This increase is attributable to the cost of additional
personnel and related costs incurred in maintaining existing products and
developing new product releases.
 
     Sales and marketing.  For the three-month period of fiscal 1997, sales and
marketing expenses increased $1,211,000 (15.8%) comparable to the same period of
fiscal 1996. The increased expenses for the fiscal 1997 period reflect the
additional personnel, commissions and related costs required in sales and
marketing to expand the Company's sales channels, penetrate new markets and
increase its market share in core markets.
 
     General and administrative.  General and administrative expenses consist of
personnel costs for administration, finance, information systems, human
resources and general management, as well as legal and accounting expenses.
General and administrative expenses increased $688,000 (40.2%) in the fiscal
1997 three-month period versus the same fiscal 1996 period. The increased
expense for the fiscal 1997 period resulted from increased employee-related
expenses associated with staffing requirements needed to support the Company's
expanding business and increased amortization of goodwill arising from the
Objectory purchase.
 
  Other Income, Net
 
     Other income, net, consists of interest income, interest expense, gains and
losses on foreign currency transactions and miscellaneous items of income and
expense. Other income increased from $180,000 to $533,000 for the quarters ended
June 30, 1995 and 1996, respectively. The quarter ended June 30, 1995 included
only one month's interest earned on cash raised from the secondary public
 
                                       17
<PAGE>   18
 
offering completed in June 1995, versus three months of interest earned for the
quarter ended June 30, 1996.
 
  Income Taxes
 
     The provision for income taxes for the first three months of fiscal 1997
and 1996 is based on the estimated annual effective tax rate and includes
current federal, state and foreign income taxes. The effective tax rates for
fiscal 1997 and 1996 differ from the federal statutory rate, primarily as a
result of the utilization of net operating loss carryforwards, offset by certain
foreign and state taxes. The higher tax rate in fiscal 1997 is primarily
attributable to higher state taxes due to utilization of remaining state net
operating losses in 1996, as well as the impact of the federal minimum tax.
 
FISCAL YEARS ENDED MARCH 31, 1996, 1995 AND 1994
 
  Revenue
 
     Total revenue increased 25% in fiscal 1996 and 4% in fiscal 1995 after a 1%
decrease in fiscal 1994.
 
     Net product revenue.  Net product revenue increased 43% in fiscal 1996
compared to decreases of 6% and 10% in fiscal 1995 and 1994, respectively. The
increase in net product revenue in fiscal 1996 was due to continued strong
customer acceptance of the Company's visual modeling tools (the Rational Rose
family) and the introduction of new versions of the Company's Rational Apex
product for C/C++ application construction. The Company's visual modeling tools
revenue grew in excess of 100% during fiscal 1996 from the prior year. The
decline in net product revenue in fiscal 1995 and 1994 was due principally to
the transition from software products designed for proprietary hardware to
software products designed for open systems and to the elimination of
overlapping product lines following the March 1994 merger. In fiscal 1996 and
fiscal 1995 the Company received no revenue from hardware sales compared to $3.5
million for fiscal 1994. Assuming the elimination of hardware sales from fiscal
1994, net product sales increased 3% in fiscal 1995 compared to fiscal 1994.
Declines in fiscal 1995 net product revenue were partially offset by increases
in the Rational Rose product line.
 
     Consulting and support revenue.  Consulting and support revenue increased
5%, 18% and 15% in fiscal 1996, 1995 and 1994, respectively. These increases
reflected higher demand for the Company's consulting expertise in object
modeling and advanced software-development practices, and, to a lesser extent,
increased training and customer-support revenues. In fiscal 1996, the decline in
year-over-year growth from fiscal 1995 was due primarily to the Company's
decision to forgo certain consulting revenue opportunities with existing
customers in favor of presales investment with new customers.
 
     International sales.  During fiscal 1996, 1995 and 1994, international
revenues from product sales and related consulting and customer support were
$33.2 million, $24.8 million, and $21.5 million, representing 36%, 34% and 31%
of total revenues, respectively. The growth in international sales in each of
the last three years was due principally to increased sales and marketing
activities in international markets. The Company's international sales are
priced in foreign currencies. The Company has attempted to limit its exposure to
fluctuations in foreign currencies from time to time by utilizing a hedging
strategy for existing receivables denominated in foreign currencies. At March
31, 1996, the Company had no forward exchange contracts. The Company's results
of operations during fiscal 1996 and 1995 were favorably impacted by changes in
foreign exchange rates. The impact of using actual exchange rates throughout the
year compared to exchange rates at the beginning of the year was to increase
income from operations by approximately $100,000 and $500,000 in fiscal 1996 and
1995, respectively.
 
  Cost of Revenue
 
     Cost of product revenue.  Cost of product revenue increased 3% in fiscal
1996 after decreasing 41% in fiscal 1995 and increasing 16% in fiscal 1994.
These costs represented 13%, 18%, and 28% of total product revenue in fiscal
1996, 1995 and 1994, respectively. In fiscal 1996, the decrease in product cost
 
                                       18
<PAGE>   19
 
as a percentage of product revenue was due mainly to lower royalty expense
resulting from a decrease in third party product sales. In fiscal 1995, the
decline in cost as a percentage of product revenues was due mainly to the
discontinuance of proprietary hardware sales, which resulted in lower material
cost, and to a lesser extent, to the change in the product mix to higher-margin
products and the elimination of overlapping product lines.
 
     Cost of consulting and support revenue.  Cost of consulting and support
increased 7%, 34% and 19% in fiscal 1996, 1995 and 1994, respectively. These
costs represented 55%, 54% and 47% of consulting and support revenue in fiscal
1996, 1995 and 1994, respectively. These increases were the result of additional
personnel and personnel-related expenses needed to perform professional services
in object modeling, advanced software-development practices, and business
process engineering. The increases as a percentage of consulting and support
revenue resulted from an increase in consulting services compared to support
services because of the cost of providing consulting services compared to the
costs of providing customer-support services.
 
  Operating Expenses
 
     Research and development.  Total expenditures for research and development
increased 31% in fiscal 1996 after decreasing 40% in fiscal 1995. Total
expenditures for research and development increased 6% in fiscal 1994. Research
and development costs represented 17%, 17% and 29% of total revenue in fiscal
1996, 1995 and 1994, respectively. The increase in fiscal 1996 was due primarily
to expenses incurred following the October 1995 acquisition of Objectory AB. The
decrease in fiscal 1995 was the result of personnel reductions implemented as
part of the 1994 merger and the elimination of redundant development efforts.
The increase in fiscal 1994 was due primarily to increased staffing and support
required to expand and enhance the Company's product line.
 
     The Company did not capitalize any software-development costs in fiscal
1996 and 1995 because eligible costs were not material. The Company capitalized
software-development costs of $1.9 million in fiscal 1994. Those costs have
since been amortized to cost of product sales. The Company expects that the
amount of software-development costs capitalized in future periods will be
immaterial to the Company's results of operations and financial position because
the time period and the engineering effort required between demonstration of a
product's economic and technological feasibility and the date of product release
has been very short.
 
     Sales and marketing.  Sales and marketing expenses increased 39% in fiscal
1996 and 18% in fiscal 1995 after decreasing 2% in fiscal 1994. These expenses
represented 38%, 34% and 30% of total revenue in fiscal 1996, 1995 and 1994,
respectively. The fiscal 1996 increase in sales and marketing expenses reflect
the additional personnel, commissions and related costs required in sales and
marketing to expand the Company's sales channels, to penetrate new markets, and
to increase its market share in core markets. Fiscal 1996 also included expenses
associated with Objectory AB since the acquisition in October 1995. The increase
in fiscal 1995 was primarily due to expansion of the Company's worldwide sales
and marketing infrastructure to support greater direct sales, both in major
accounts and geographic territories, expansion of the Company's telesales
channel and penetration of new markets such telecommunications, banking and
financial services, and transportation.
 
     General and administrative.  General and administrative expenses increased
36% in fiscal 1996 after decreasing 3% and 4% in fiscal 1995 and 1994,
respectively. General and administrative expenses represented 11%, 10% and 10%
of total revenue in fiscal 1996, 1995 and 1994, respectively. The increase in
general and administrative expenses in fiscal 1996 is due primarily to expenses
associated with Objectory AB since the acquisition in October 1995, to
amortization of goodwill and other purchased intangibles resulting from the
Objectory acquisition, and to an increase in the reserve for doubtful
 
                                       19
<PAGE>   20
 
accounts. The decrease in general and administrative expenses in absolute
dollars in fiscal 1995 and 1994 is primarily attributable to economies of scale
and increased efficiencies in the Company's administrative operations following
the March 1994 merger of Verdix and old Rational.
 
     Charges for acquired in-process research and development.  In connection
with the acquisition of Objectory AB, acquired in-process research and
development of $8.7 million was charged to operations during the Company's third
fiscal quarter. In-process research and development represents the present value
of the estimated cash flow expected to be generated by Objectory AB related
technology which at the acquisition date has not yet reached the point of
technological feasibility and does not have an alternative future use.
 
     Merger and restructuring costs.  Merger-related expenses of $9.9 million
were recorded in fiscal 1994 as a result of the closing of facilities, severance
costs, administrative costs, and the write-off of capitalized software costs
related to overlapping product lines. The actions related to severance,
administrative and capitalized software costs are complete. During fiscal 1995
the Company recorded expense reductions of $1.1 million relating to the reversal
of the rent accrual associated with the closing of facilities. The accrual was
reduced as a result of greater-than-anticipated recoveries through subleases of
certain facilities reserved at the time of the merger. The remaining facilities
accrual is $1.7 million as of March 31, 1996.
 
  Other Income, Net
 
     Other income has fluctuated as a result of operating results, the amount of
cash available for investment in interest-bearing accounts, and the extent of
foreign currency transactions. Other income, net, increased $1.2 million to $1.6
million in fiscal 1996 from $0.4 million in fiscal 1995. The increase is due
primarily to interest earned on cash generated from the Company's public
offering, which was completed in June 1995.
 
  Income Taxes
 
     The provision for income taxes consists primarily of foreign income taxes
as well as federal and state minimum taxes. The effective tax rate for 1996
differs from the federal statutory income tax rate due primarily to the impact
of non-tax deductible charges for acquired in-process research and development,
utilization of net operating loss carryforwards, and foreign and state taxes. As
of March 31, 1996, the Company had net operating loss carryforwards for federal
income tax purposes of approximately $47.4 million that expire in 1997 through
2011. In addition, the Company had approximately $3.1 million of tax credit
carryforwards which expire in years 1997 through 2010 if not utilized. As a
result of the common stock sale in June 1995, the Company incurred a change in
ownership as defined under Section 382 of the Internal Revenue Code of 1986.
Accordingly, approximately $34 million of the Company's net operating loss
carryforwards and all of the tax credit carryforwards will be subject to an
annual limitation of approximately $8.7 million regarding their utilization
against taxable income in future periods. In addition, as a result of the merger
with old Rational and provisions in the Internal Revenue Code, utilization of
approximately $4.6 million of net operating loss carryforwards are further
limited to the future income of the Company. Based on the Company's earnings
history, a valuation allowance for deferred tax assets of approximately $25.0
million is required to reduce the Company's net deferred tax assets to the
amount realizable. See Note 8 of Notes to Consolidated Financial Statements.
 
                                       20
<PAGE>   21
 
QUARTERLY RESULTS
 
     The following table sets forth consolidated statements of operations data
for each of the nine quarters in the period ended June 30, 1996, and the
percentage of the Company's net revenues represented by each item of the
respective quarter. This information has been derived from unaudited
consolidated financial statements that, in the opinion of management, reflect
all adjustments (consisting only of normal recurring accruals) necessary to
fairly present this information when read in conjunction with the Consolidated
Financial Statements and Notes thereto appearing elsewhere in this Prospectus.
The results of operations for any quarter are not necessarily indicative of the
results to be expected for any future period.
 
<TABLE>
<CAPTION>
                                                                         QUARTER ENDED
                               --------------------------------------------------------------------------------------------------
                               JUNE 30,   SEPT. 30,   DEC. 31,   MAR. 31,   JUNE 30,   SEPT. 30,   DEC. 31,   MAR 31,    JUNE 30,
                                 1994       1994        1994       1995       1995       1995        1995       1996       1996
                               --------   ---------   --------   --------   --------   ---------   --------   --------   --------
                                                             (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                            <C>        <C>         <C>        <C>        <C>        <C>         <C>        <C>        <C>
Net product revenue..........  $ 8,915     $ 9,429    $ 9,983    $10,894    $11,454     $13,815    $ 14,905   $15,725    $17,300
Consulting and support
  revenue....................    8,068       8,299      8,622      8,689      8,303       7,827       9,099     9,979     10,161
                               -------     -------    -------    -------    -------     -------     -------   -------    -------
    Total revenue............   16,983      17,728     18,605     19,583     19,757      21,642      24,004    25,704     27,461
Cost of product revenue......    1,435       1,304      1,741      2,475      1,250       1,879       1,952     2,115      1,825
Cost of consulting and
  support revenue............    4,337       4,597      4,506      4,655      4,763       4,165       4,860     5,548      5,499
                               -------     -------    -------    -------    -------     -------     -------   -------    -------
    Total cost of revenue....    5,772       5,901      6,247      7,130      6,013       6,044       6,812     7,663      7,324
                               -------     -------    -------    -------    -------     -------     -------   -------    -------
    Gross profit.............   11,211      11,827     12,358     12,453     13,744      15,598      17,192    18,041     20,137
Operating expenses:
Research and development.....    3,086       3,191      2,876      3,034      3,171       3,285       5,374     4,109      4,495
Sales and marketing..........    5,986       6,060      6,558      6,496      7,666       8,417      10,906     8,011      8,877
General and administrative...    1,711       1,915      1,828      1,541      1,711       2,066       3,446     2,288      2,399
Charges for acquired
  in-process research and
  development................       --          --         --         --         --          --       8,700        --         --
Merger and restructuring
  costs......................       --        (590)      (510 )       --         --          --          --        --         --
                               -------     -------    -------    -------    -------     -------     -------   -------    -------
    Total operating
      expenses...............   10,783      10,576     10,752     11,071     12,548      13,768      28,426    14,408     15,771
                               -------     -------    -------    -------    -------     -------     -------   -------    -------
    Income (loss) from
      operations.............      428       1,251      1,606      1,382      1,196       1,830     (11,234)    3,633      4,366
Other income, net............       18          76         99        224        180         446         291       665        533
                               -------     -------    -------    -------    -------     -------     -------   -------    -------
    Income (loss) before
      provision for income
      taxes..................      446       1,327      1,705      1,606      1,376       2,276     (10,943)    4,298      4,899
    Provision for income
      taxes..................       31         106        141        128        110         182         220       516        735
                               -------     -------    -------    -------    -------     -------     -------   -------    -------
Net income (loss)............  $   415     $ 1,221    $ 1,564    $ 1,478    $ 1,266     $ 2,094    $(11,163)  $ 3,782    $ 4,164
                               =======     =======    =======    =======    =======     =======     =======   =======    =======
Net income (loss) per common
  share......................  $  0.02     $  0.05    $  0.06    $  0.06    $  0.04     $  0.06    $  (0.34)  $  0.12    $  0.11
Shares used in computing
  per share amounts..........   24,814      24,814     25,336     25,884     28,536      33,206      32,466    36,042     36,930
</TABLE>
 
<TABLE>
<CAPTION>
                                                                AS A PERCENTAGE OF TOTAL REVENUE
                               --------------------------------------------------------------------------------------------------
<S>                            <C>        <C>         <C>        <C>        <C>        <C>         <C>        <C>        <C>
Net product revenue..........       52 %        53%        54 %       56 %       58 %        64%         62%       61 %       63 %
Consulting and support
  revenue....................       48          47         47         44         42          36          38        39         37
                               --------   ---------   --------   --------   --------   ---------   --------   --------   --------
    Total revenue............      100         100        100        100        100         100         100       100        100
Cost of product revenue......        8           7          9         12          6           9           8         8          7
Cost of consulting and
  support revenue............       26          26         24         24         24          19          20        22         20
                               --------   ---------   --------   --------   --------   ---------   --------   --------   --------
    Total cost of revenue....       34          33         34         36         30          28          28        30         27
                               --------   ---------   --------   --------   --------   ---------   --------   --------   --------
    Gross profit.............       66          67         66         64         70          72          72        70         73
Operating expenses:
Research and development.....       18          18         15         16         16          15          22        16         16
Sales and marketing..........       35          34         35         33         39          39          45        31         32
General and administrative...       10          11         10          8          9          10          14         9          9
Charges for acquired
  in-process research and
  development................       --          --         --         --         --          --          36        --         --
Merger and restructuring
  costs......................       --          (3)        (3 )       --         --          --          --        --         --
                               --------   ---------   --------   --------   --------   ---------   --------   --------   --------
    Total operating
      expenses...............       63          60         58         57         64          64         118        56         57
                               --------   ---------   --------   --------   --------   ---------   --------   --------   --------
    Income (loss) from
      operations.............        3           7          9          7          6           8         (47)       14         16
Other income, net............       --          --          1          1          1           2           1         3          2
                               --------   ---------   --------   --------   --------   ---------   --------   --------   --------
    Income (loss) before
      provision for income
      taxes..................        3           7          9          8          7          11         (46)       17         18
    Provision for income
      taxes..................       --           1          1          1          1           1           1         2          3
                               --------   ---------   --------   --------   --------   ---------   --------   --------   --------
Net income (loss)............        2 %         7%         8 %        7 %        6 %        10%        (47)%      15 %       15 %
                               ========   ========    ========   ========   ========   ========    ========   ========   ========
</TABLE>
 
                                       21
<PAGE>   22
 
LIQUIDITY AND CAPITAL RESOURCES
 
     As of June 30, 1996, the Company had cash, cash equivalents, and short-term
investments of $52,922,000 and working capital of $51,386,000. This is due
primarily to a public offering of the Company's Common Stock in June 1995, with
net proceeds of $29.9 million after deducting underwriting discounts,
commissions, and expenses.
 
     Operating activities generated cash of $13.6 million in fiscal 1996 and
generated cash of $1.7 million in fiscal 1995. Net cash generated by operating
activities during fiscal 1996 was composed primarily of a net loss plus an
increase in trade accounts receivable, offset by noncash adjustments consisting
of the write-off of acquired in-process research and development, depreciation
and amortization, and an increase in deferred revenue. Net cash generated by
operating activities during fiscal 1995 was due primarily to net income along
with depreciation and amortization offset by increases in accounts receivable
and decreases in accrued expenses and merger-related costs. Net cash used in
operating activities for the three-month period ending June 30, 1996 was
composed primarily of decreases in accrued employee benefits and deferred
revenue offset by a decrease in accounts receivable and increased net income.
 
     The Company's investing activities have consisted primarily of the purchase
and sale of short-term investments in commercial paper and expenditures for
fixed assets, which totaled $2.8 million for fiscal 1996 and $3.2 million for
fiscal 1995. The Company has no significant capital commitments and currently
anticipates that additions to property and equipment for the next fiscal year
will be comparable to recent past years.
 
     Financing activities generated cash of $31.1 million in fiscal 1996, of
which $29.9 million was generated by the public offering of the Company's Common
Stock in June 1995 and $3.8 million was generated from the issuance of Common
Stock upon the exercise of stock options and pursuant to the Company's employee
stock purchase plan, offset by $2.6 million used to decrease long-term
obligations and capital lease obligations. In fiscal 1995, financing activities
used cash of $1.5 million, including $2.5 million used to decrease long-term
debt and capital lease obligations offset in part by $0.6 million of proceeds
from the issuance of Common Stock upon the exercise of stock options.
 
     The Company believes that the net proceeds from the sale of Common Stock
offered by this Prospectus, together with cash flow from operations and existing
cash balances, will be sufficient to meet its cash requirements for the
foreseeable future.
 
                                       22
<PAGE>   23
 
                                    BUSINESS
 
     Rational Software Corporation ("Rational" or the "Company") develops,
markets and supports a comprehensive solution for the component-based
development of software systems. The Company's objective is to ensure the
success of customers in developing and managing software systems that are
strategically important to their businesses. Rational provides an integrated
family of tools that spans the critical phases of the software development
process from initial analysis and design through delivery and maintenance. In
addition, the Company provides technical consulting, training and support
services. By supporting controlled iterative development, visual modeling and an
architecture-driven process, Rational's products and services enable customers
to reduce the risk of project failure, improve the quality of the software
systems they develop, increase developer productivity, reduce time-to-market and
increase software reusability.
 
INDUSTRY BACKGROUND
 
     Traditional software development techniques have not kept pace with
advances in computer processor technology, with the development of new platforms
such as the Internet or company-specific intranets, or with the general demand
for distributed software systems such as multi-tiered client/server
applications. Software, therefore, has increasingly become the constraint on
performance, quality, and time-to-market for many organizations. The ability to
quickly and cost-effectively create complex software applications that perform
as desired and that are easy to maintain and reuse in related applications and
products can be a critical competitive differentiator. As the number and
complexity of software applications continues to expand, it is becoming
increasingly important for businesses to migrate to a more effective approach to
software development.
 
  The Growth of Software Systems
 
     Software permeates products and processes encountered in almost every
aspect of daily life. Many companies base their businesses on enterprise-wide
information systems which are increasingly built as distributed systems
exploiting a company-specific intranet or the Internet. Software is at the core
of business applications ranging from equity-trading systems to inventory
management. The telecommunications business is highly dependent on software in
areas as diverse as call routing, switching, rate setting and billing. Software
is the central element of command-and-control systems in submarines and military
aircraft. Software governs the operation of machines from ordinary office
copiers and cellular phones to life-saving medical devices. As organizations
seek competitive advantage by exploiting the ongoing improvements in
microprocessor technology and the emergence of new computing platforms, software
is becoming more pervasive and more sophisticated. The success of businesses
around the world depends increasingly on their ability to construct and modify
software systems that match their changing business needs.
 
  The Challenge of Developing Software Systems
 
     As demand for software applications continues to grow, managers and
technical personnel face increasing difficulty controlling the complexity of
software, coordinating ever-expanding teams of developers, supporting
development and deployment on multiple hardware platforms and operating systems,
and delivering systems that meet the needs of the users on time and on budget.
Software development projects across a wide range of industries and application
types suffer from a high rate of failure, resulting in project cancellation,
substantial cost overruns or significant delays to market. An enormous amount of
time and energy is wasted by organizations building software systems that fail
or fall short of user expectations.
 
                                       23
<PAGE>   24
 
     As software development becomes more complex, traditional methods are
becoming increasingly inadequate to respond to the following challenges faced by
many developers:
 
          Addressing hard-to-define and constantly changing customer
     requirements.  When a software system is first specified, the specification
     is often incomplete, ambiguous, or contradictory and evolves while the
     system is being built.
 
          Coordinating teams of developers.  Team members, who often are
     geographically distributed, must work in parallel on different elements of
     an overall system without interfering with one another's work. As the size
     of the development team increases, difficulties in communication and
     coordination among team members typically increase at an even greater rate.
 
          Reusing software on a large scale.  The ability to reuse software
     components on a large scale to enhance existing products and build
     additional products offers organizations the opportunity to further
     leverage their investments in software development and decrease the cost
     and time-to-market of new products.
 
          Adhering to stringent reliability and certification
     standards.  Customers often require that software systems meet stringent
     performance and reliability specifications. In addition, software
     developers are often required to formalize, document and improve their
     software development processes in order to gain market entry to industries
     regulated by the Federal Aviation Administration, the Department of
     Defense, the Food and Drug Administration or other certifying bodies that
     review the software components of regulated products.
 
          Developing and deploying new software in combination with existing
     software on multiple platforms and operating systems.  Software developers
     creating different elements of the same project often work on different
     hardware platforms and operating systems, such as in the development of
     client/server systems. Furthermore, purchasers of software developed for
     one platform or operating system often require the ability to deploy the
     software on new platforms or operating systems. In addition, developers are
     often required to incorporate elements of existing software systems into
     new projects.
 
     Organizations have tried, often without success, to address these
challenges with a variety of development products and processes. Typical
approaches have included structured analysis and design, the use of numerous
stand-alone tools from various vendors to address various aspects of
programming, the use of CASE (Computer-Aided Software Engineering) tools to
automate portions of the software development process, and numerous management
approaches such as design review and code "walk-throughs." However, none of
these solutions offered a fully integrated approach. For example, traditional
CASE tools required users to adopt methods that were difficult to use and that
did not track the typical software development process.
 
     Many large organizations have responded to the absence of a satisfactory
commercial solution by attempting to create ad hoc software development tools
and processes in-house. However, because such organizations typically are not in
the primary business of creating software development tools, such in-house
efforts frequently are hampered by a lack of understanding of the complexity
involved, a lack of relevant expertise within the organization, and limits on
the amount of resources available for efforts that will benefit only a single
product line or organization.
 
     Commercial and in-house efforts often are further hampered by their
reliance on traditional sequential development methods. In applying these
methods, the analysis, design, coding, unit testing, software integration and
delivery phases of a software development project take place sequentially. The
end product is not delivered until the very end of the process, often months or
years later. Traditional sequential methods are poorly suited to responding to
specifications that evolve during the development process. They also involve a
high degree of risk that flaws in the system will not be discovered until the
end of the development process, requiring significant, and often unplanned,
time, effort and expense to produce a working product.
 
                                       24
<PAGE>   25
 
  The Emergence of Component-Based Development
 
     Component-based development is a way of constructing software systems by
combining and integrating pre-engineered and pre-tested software components.
Component-based development has emerged as a powerful technique to simplify the
construction of software systems and to improve their quality. Software
components can be designed, developed, and tested once, and then combined
multiple times by other users to create new software systems in a manner
analogous to combining hardware integrated circuits to create a new electronic
device. By increasing software re-use, this approach reduces the amount of
source code that must be created in connection with the development of a new
software system, helping to reduce risk, time-to-market and cost, as well as to
improve the quality of the resulting software.
 
     Rudimentary forms of software components have been used for several
decades, starting with the use of subroutines in the first programming
languages. The increasing adoption of object-oriented development during the
1990s has fostered a higher level of software component use. In object-oriented
programming, "objects" are used as building blocks to model real-world
processes. Each object is a collection of data and code that performs operations
on that data. Details of how the object is implemented are "encapsulated," or
hidden, from all but the developer of the object, thus enabling the developer or
team responsible for the object to modify it without impacting the work of other
developers. Reducing or eliminating unnecessary interdependencies among objects
enables the efficient re-use of objects on a modular basis.
 
     Component-based development builds on the foundation provided by
object-oriented programming, using components with more functionality to provide
a higher level of abstraction with greater capability. Often, a complete program
will serve as a component in a larger system. By raising the level of
abstraction and re-use of components, component-based development offers higher
leverage and return on investment than previous techniques.
 
     The growing interest in and increasing usage of component-based development
are driven by several major industry trends that emphasize the development of
separate but complete programs that work together as part of a larger system.
These include the growth of the Internet, company-specific intranets, and
distributed multi-tier client/server systems. Component-based development is
also driven by the widespread adoption of implementation languages such as
Visual Basic, Java, and related technologies such as CORBA and Microsoft's
ActiveX, each of which provides mechanisms necessary for distributed components
to work together.
 
     Major software vendors including Microsoft, Oracle, Hewlett-Packard, Sun
Microsystems and Netscape Communications have begun to use internally, and some
have publicly endorsed, component-based development. For example, Java applets
are separate, self-contained, pre-existing programs (components) that can be
automatically downloaded from an Internet site and run on a user's system. In
addition, the Company believes that Microsoft's strategy for supporting
customers that are building enterprise information systems is based on
component-based development. Much of Microsoft's technology infrastructure is
aimed at providing ways of allowing complete programs to serve as software
components that can be integrated with other components.
 
THE RATIONAL APPROACH(TM)
 
     Rational provides extensive support for component-based development through
each of the major phases of the software development lifecycle. The Rational
Approach consists of three elements: a flexible software development process, a
set of integrated products and technical consulting services. This approach
enables customers to reduce the risk of failure, improve the quality of the
software systems they develop, increase developer productivity, reduce
time-to-market and increase software reusability.
 
                                       25
<PAGE>   26
 
     The first element of the Rational Approach, a flexible software development
process, includes several software development concepts:
 
          Controlled iterative development: Reducing risk, cost and
     time-to-market.  Rational's tools support controlled iterative development,
     which the Company believes is more economical and predictable than
     traditional sequential development, significantly reducing the risk and
     cost of developing software. In controlled iterative development, the
     objectives for a software system are specified and used to drive the
     creation of a series of partial but increasingly functional systems. Risk
     is reduced because each iteration provides an opportunity for developers to
     identify problems in system functionality, performance and user interface,
     and to obtain user and customer feedback. The need for unplanned,
     unbudgeted fixes can be significantly reduced or eliminated. Controlled
     iterative development also provides a significant time-to-market advantage.
     Because working iterations are available over much of the project
     lifecycle, developers have the option of shipping a high-quality system
     even before full functionality is implemented, if necessary to take
     advantage of a market window, and to add functionality as new iterations
     are completed.
 
          Visual modeling: Managing complexity.  Visual modeling is a technique
     in which software components and the relationships among them are described
     graphically. The model captures information about business processes or
     software requirements, and the software components and architectures
     necessary to implement them. The model raises the level of abstraction from
     source code to a visual programming approach, which the Company believes is
     more intuitive than non-graphical approaches for most software developers.
     Visual modeling is an essential element of using component-based
     development on a large scale.
 
          Architectural approach: Enhancing quality and re-use.  Rational's
     tools help software developers build applications that have a sound
     architecture, thereby maintaining the flexibility to make modifications or
     add new modules. This, in turn, can increase reusability and thereby
     decrease time-to-market for future products. Software architecture refers
     to the basic structure and foundation of a software program. Designing a
     robust architecture early in the development process, verifying the
     soundness of the architecture with early development iterations, and
     enforcing the integrity of the architecture over the lifetime of the
     project produce an architecture that is adaptable in the face of changes
     driven by customer feedback or changing business conditions. A
     well-designed architecture also allows the developer to identify and
     package reusable software components. Unless consistently enforced, system
     architecture can begin to break down as the original architecture is
     violated or circumvented, either by accident or in response to development
     time pressures.
 
     The second element of the Rational Approach is a comprehensive set of
integrated software-development products that automate the activities of
software managers, designers and developers throughout the software lifecycle.
Rational's products include Rational Rose, Visual Test, Rational Apex, Rational
Summit and SoDA. Rational's products support visual modeling of the basic
business processes and objects necessary for implementing enterprise-wide
information systems and developing software components. Rational's products
further support the definition of software architecture, coding, testing,
debugging, software change management, software process enforcement and
documentation of components and entire software systems.
 
     The third element of the Rational Approach is to provide customers with
technical consulting, training and support services. These services help
customers apply the elements of the flexible software development process and
use Rational's tools effectively. Rational's services are designed to minimize
customers' risks and maximize their ability to achieve their business
objectives.
 
                                       26
<PAGE>   27
 
RATIONAL'S BUSINESS STRATEGY
 
     Rational's strategy is to ensure the success of its customers in developing
and managing software systems that are strategically important to their
businesses. Key components of the Company's strategy are to:
 
          Maintain technology leadership.  The Company offers a comprehensive
     family of software products that enable component-based development
     throughout the critical phases of the software development process. The
     Company has pioneered the tight integration of individual tools to support
     controlled iterative development and an architecture-driven process
     throughout the software development lifecycle. The Company plans to
     continue enhancing its products and integrating additional tools that
     strengthen and extend the Company's support for component-based
     development.
 
          Support the major platforms and implementation languages.  Rational's
     strategy is to offer products that support component-based development on
     the major UNIX platforms, Windows 95, and Windows NT. The Company believes
     that in order to reach a wide market for its products it is important to
     support the major implementation languages used for software development.
     The Company currently supports Visual Basic, C++ and PowerBuilder, and has
     announced plans to introduce products, currently in beta testing, that
     support Java and Forte. The Company plans to adapt and extend its
     technology to support additional implementation languages as they become
     widely used.
 
          Leverage the business alliance with Microsoft.  On October 2, 1996,
     the Company and Microsoft announced the formation of a business alliance
     that will consist of four major elements: technology cross-licensing, joint
     development, joint marketing and Rational's acquisition of Microsoft's
     Visual Test product. Rational believes that the strategies of the two
     companies in relation to the enterprise information systems market are
     complementary, and the parties have announced that the alliance is intended
     to allow Microsoft to focus on development environments like Visual Basic,
     Visual C++ and Visual J++ and Rational to focus on lifecycle tools for
     analysis and design, testing, documentation and change management. The
     Company believes that this alliance will facilitate the integration of its
     products with Microsoft's technology, leading to products that are more
     appealing to software developers using Windows 95 and Windows NT. Further,
     the Company believes that its alliance with Microsoft will enable the
     introduction of the Company's products to software developers using
     Microsoft's products. See "-- Business Alliance with Microsoft."
 
          Drive the industry standard for visual modeling.  The Company believes
     that its Unified Modeling Language has become the de facto standard
     language for visual modeling of business processes and for the development
     of software systems. Rational, Microsoft, Oracle and Hewlett-Packard have
     announced plans to submit a joint proposal for inclusion of the UML in the
     OMG's Object Analysis and Design Facility specification. Rational believes
     that the existence of an official standard will help accelerate the rate of
     adoption of object technology by reducing the uncertainty and confusion
     that stem from a lack of standards. The Company believes that it is
     well-positioned as the developer of the UML standard and as a market leader
     in visual modeling tools. See "Risk Factors -- Dependence Upon Market
     Growth and Development of Industry Standards."
 
          Build comprehensive distribution capabilities.  Rational intends to
     continue leveraging its worldwide presence to provide tools to customers
     whose businesses depend on developing and maintaining software systems. The
     Company's direct sales force, supported by highly-skilled technical
     personnel in the field, allows the Company to work closely with its
     customers to help ensure their success. In fiscal 1996, the Company
     established new sales channels, including telesales, service providers and
     VARs, which it intends to expand. In addition, Rational plans to make
     extensive use of the Internet for marketing, selling and customer support,
     with the objective of reaching a larger potential market while reducing
     selling costs.
 
                                       27
<PAGE>   28
 
     The discussion of the Company's strategy above contains forward-looking
statements that are based upon the Company's current intentions and that involve
risks and uncertainties. Actual results and future actions taken by the Company
could differ materially from those discussed in the forward-looking statements
as a result of certain factors, some of which are beyond the Company's control
and are dependent upon future market developments. See "Risk
Factors -- Dependence Upon Market Growth and Development of Industry Standards,"
"-- Expansion of Product Lines," "-- Business Alliance with Microsoft," and
"-- Dependence on Sales Force and Other Channels of Distribution," as well as
the other risks set forth in "Risk Factors" and elsewhere in this Prospectus.
 
PRODUCTS AND SERVICES
 
     Rational supports component-based development with an extensive family of
software products covering critical phases of the software development
lifecycle, from initial analysis of requirements through detailed design,
coding, testing, debugging and maintenance. Rational's products support
individual designers and developers, development teams and project managers. The
major components of Rational's product line are Rational Rose, for visual
modeling; Rational Apex, for managing development teams and the components they
generate; Rational Summit, for software change management and process
enforcement; and SoDA, for automated documentation generation. These tools work
together to support controlled iterative development, visual modeling and an
architecture-driven process in a consistent manner. In addition, the Company is
adding Visual Test to its product line for automated software testing on Windows
95 and Windows NT.
 
  Rational Rose: Visual Modeling Tools
 
     Rational Rose is a software-engineering tool that allows users to develop,
verify and document the analysis and design model of their software graphically.
Rational Rose keeps the analysis and design model consistent through the entire
software lifecycle, making controlled iterative development feasible. The first
Rational Rose product was shipped in 1992. Rational Rose is used in the
construction of enterprise information systems, packaged software products,
systems integration activities, and for the construction of technical systems in
industries such as telecommunications, medical instruments, transportation and
aerospace. Over 20,000 licenses of Rational Rose family products have been sold
worldwide. Rational Rose has been the recipient of industry product-excellence
awards.
 
     The Company's Rational Rose product line supports major platforms,
including UNIX, Windows 95 and Windows NT, and implementation languages,
including C++, Visual Basic and Power Builder, that are widely used today. The
Company has also announced plans to introduce Rose/Java and Rose/Forte, which
are currently in beta testing. Rational Rose generally supports round-trip
engineering, in which the user can go from graphical design to generation of
source code, modify the resulting source code, reverse engineer the new source
code to generate a graphical depiction of the system as it exists after being
modified, and merge any changes made in the source code back into the model or
vice versa. By keeping the graphical analysis and design model consistent with
the source code, Rational Rose supports controlled iterative development over
the lifetime of the project. The Company believes that Rational Rose is unique
in its ability to support an unlimited number of "round-trips" with no loss of
information.
 
  Rational Apex: Integrated Development Environment Tools
 
     Rational Apex is a software-engineering environment for control of software
projects. It effectively controls large-scale development efforts, helping
customers improve time-to-market while reducing risk and cost. It also makes
large-scale software re-use possible by directly managing software architecture,
significantly improving the efficiency of the overall software development
process. The product was first shipped in 1993, replacing the Company's
first-generation programming environment, and over 7,500 licenses have been sold
to date. Rational Apex runs on UNIX platforms and is available in versions that
support the C/C++ and Ada programming languages. The Company has announced
 
                                       28
<PAGE>   29
 
that the next release of its Apex C/C++ product will provide architectural
control and build/release management for Java.
 
     Rational Apex gives users architectural control, a way of expressing and
enforcing automatically the overall architecture of a software system throughout
the lifetime of the project, allowing users to replace manual mechanisms of
expressing and enforcing a software system's architecture. The product provides
a construct that enforces the boundaries of the architecture automatically. It
detects, reports and eliminates violations of the architecture, preventing the
decay or degradation of the architecture that can occur over the lifetime of a
project.
 
     Rational Apex also provides extensive support for day-to-day configuration
management and version control. It supports parallel development within and
among development teams. It generates an audit trail of changes to the software,
capturing the specifics of every change made over the course of the project. The
building and releasing of each iteration of a software system is automated,
thereby providing the team and project management support that is essential for
controlled iterative development.
 
     The Apex family also includes the VADS line of Ada compilers, debuggers,
and related tools for the development of highly-reliable, high-performance
embedded systems. VADS was first shipped in 1984 and over 7,000 licenses have
been shipped to date. The VADS family runs on major UNIX platforms, and the VADS
cross-compiler product family supports major embedded system targets including
the PowerPC, Motorola 680x0 and Intel architecture.
 
  Rational Summit: Software Change-Management Tools
 
     Rational Summit is an integrated software change-management tool that helps
manage the overall software change process, including change identification,
change policy enforcement, and measurement and management of software
development progress. Rational Summit allows users to group a number of related
software changes into a task, which can then be explicitly managed. These
changes may collectively be necessary, for example, to fix a software bug or to
add a requested feature. Rational Summit can be customized and configured to
meet specific change-management needs of organizations.
 
     Rational Summit is available on major UNIX platforms. Rational Summit was
first shipped in May 1996 and approximately 750 licenses have been sold. Summit
supports integration with the leading desktop project-management tools, such as
Microsoft Project and Microsoft Excel.
 
  SoDA: Software Document Authoring Tools
 
     SoDA allows users to generate documentation automatically and incrementally
using graphical and textual information taken from many external sources. SoDA
also can be tailored to a variety of documentation formats and can be used on
projects regardless of the implementation language. SoDA is available on UNIX,
Windows 95 and Windows NT. SoDA was first shipped in June 1994, and over 1,500
licenses have been sold to date.
 
  Visual Test: Software Testing Automation Tools
 
     Visual Test, an automated, language-independent, software testing tool, is
designed to increase developers' and testers' productivity by rapidly creating
tests for applications of virtually any size and created in any implementation
language by capturing those tests for later re-use. These capabilities enhance
the ability of organizations to deploy applications for the Windows 95 and
Windows NT operating systems. Visual Test includes a Scenario Recorder used to
create test cases interactively, and may be used to test individual software
components or entire systems, including "stress tests" of large client/server
applications. Visual Test supports testing of the latest technologies, such as
ActiveX Controls, which helps developers to ensure the quality of their
applications while realizing the
 
                                       29
<PAGE>   30
 
productivity benefits of component software. Visual Test is integrated with
Microsoft Developer Studio, a desktop development environment.
 
     Visual Test was first shipped by Microsoft in 1992. Microsoft has announced
the shipment of over 75,000 licenses since the product's introduction. Rational
acquired Visual Test on October 2, 1996 from Microsoft.
 
  Technical Consulting and Customer Support Services
 
     The Company views its technical consulting services as an important part of
its strategy of offering a complete, integrated solution for customers who are
developing complex software systems, as well as a way to promote higher-margin
product sales. The Company approaches the delivery of its technical consulting
services as a partnership with its customers. Customers often request the
Company's guidance to help them improve their approach to software development,
to realize the benefits of the Rational Approach and to efficiently use the
Company's products.
 
     Rational's services include consulting and training that enable customers
to adopt advanced software processes and to use component-based development
effectively. Consulting services range from helping customers implement
large-scale software re-use, to working with customers to develop the right
architecture for their software systems, to helping a customer's development
team work through the first few iterations of the controlled iterative
development process. The Company also offers several standard consulting
packages and training courses that assist customers in the implementation of
controlled iterative development and the use of component-based development.
 
     The Company complements its products and professional services with an
experienced team that allows it to maintain strong relationships with its
customers and further promote its products and services. The Company provides
telephone, electronic mail and fax-based customer support through the Company's
Customer Support Services organization. Members of the Company's software
support team typically have several years experience in areas such as software
engineering, software testing, or tool development.
 
BUSINESS ALLIANCE WITH MICROSOFT
 
     On October 2, 1996, Rational and Microsoft announced the formation of a
business alliance which will consist of Rational's acquisition of Microsoft's
Visual Test product, technology cross-licensing, joint development projects and
joint marketing programs. See "Risk Factors -- Business Alliance with
Microsoft," "-- Acquisition of the Visual Test Product," "-- Licensing of Rose
Technology to Microsoft," and "Management's Discussion and Analysis of Financial
Condition and Results of Operations -- Overview."
 
     In connection with this alliance, Rational acquired from Microsoft the
Visual Test product, a leading software testing tool. Microsoft has announced
the shipment of over 75,000 licenses since the product's introduction in 1992.
Rational intends to release new versions of the Visual Test product that extend
its support for component-based development and Internet applications. Microsoft
has retained rights to continue using Visual Test in its own software
development, and the companies have agreed to work together to specify and
develop new product features and updated releases to exploit new releases of
Microsoft's operating system and tools products. Rational has also granted
Microsoft the option to obtain a license to incorporate certain elements of
Visual Test technology in Microsoft's development tool products, including
Visual Basic, Visual C++ and Visual J++. See "-- Products and Services -- Visual
Test: Software Testing Automation Tools."
 
     The cross-licensing element of the alliance includes a license to Rational
to develop and distribute, as part of Rational's products, Microsoft's Developer
Studio, an integrated development environment for Windows 95 and Windows NT.
Rational plans to integrate its visual modeling tools into Developer Studio. In
addition, Rational has licensed the rights to the future Microsoft repository,
and Rational plans to integrate its products with Visual Source Safe,
Microsoft's version control system, introducing capabilities for change
management and process automation.
 
                                       30
<PAGE>   31
 
     Rational has entered into an agreement to develop a visual modeling
product, including certain elements of Rational Rose, for distribution in
certain Microsoft development tools which run on Windows 95 and Windows NT.
Rational will be obligated to provide timely product updates to maintain
compatibility with changes in Microsoft operating systems. Following expiration
of the agreement, Microsoft will have the option to obtain a perpetual,
non-exclusive right to source code for the product, including certain aspects of
Rational's Rose technology.
 
     Rational's objective in acquiring the Visual Test product and partnering
with Microsoft is to extend the Company's product line and to increase the use
of component-based development by providing visual modeling capabilities to
developers using Microsoft's visual tools. In addition, Rational believes that
its arrangement with Microsoft will expose the Company's technology to potential
customers outside of its historical customer base. The Company expects that
changes in its pricing models and combinations of features within product lines
will be required to encourage these potential customers to purchase Rational
products.
 
     Joint development efforts include Rational developers and testers working
with Microsoft personnel on site at Microsoft in Redmond, Washington, to
integrate Rational's products with the Microsoft infrastructure, including DCOM,
ActiveX, BackOffice and the Microsoft visual tool products. The joint
development efforts also include testing of Rational products in Microsoft's
Usability Labs.
 
     Plans for joint marketing activities include use of the Internet and the
World Wide Web, co-sponsored seminars, joint press conferences, direct mail
campaigns and other promotional activities.
 
PRODUCT DEVELOPMENT
 
     Rational believes that its success will depend largely upon its ability to
enhance existing products and develop new products that meet the needs of a
rapidly evolving marketplace and increasingly sophisticated and demanding
customers. The Company intends to extend and strengthen its lifecycle support
for component-based development by expanding its product offerings, introducing
new products, and offering higher levels of integration among its products.
Rational uses its own software processes and tools extensively in its own
software development activities. While the Company has primarily developed
products internally, it may, based on timing and cost considerations, acquire
technologies or products from third parties.
 
     The Company's research and development staff, including product
development, product support and technical writing personnel consists of 133
employees as of June 30, 1996. Rational's total research and development
expenses were approximately $20.2 million, $12.2 million and $15.9 million in
fiscal years 1994, 1995, and 1996, respectively.
 
CUSTOMERS AND APPLICATIONS
 
     Over 40,000 licenses of Rational's software products, exclusive of Visual
Test, have been sold to over 2,500 customers worldwide. No single customer
accounted for 10% or more of revenues in fiscal 1996. The Company's
comprehensive solution of software development tools and professional services
is used by major organizations in many industry segments to design, build and
maintain complex software systems.
 
                                       31
<PAGE>   32
 
     The following customers were among the Company's largest customers in
fiscal 1996 in the areas listed:
 
ENTERPRISE INFORMATION SYSTEMS
 
    AT&T
    Daimler-Benz
    Dow Chemical
    Eastman Kodak
    Knight-Ridder
    MCI
    NBC
    NTT
    Nynex
    Osaka Gas Information Systems
    Reuters
    WorldCom
    Xerox
 
TELECOMMUNICATIONS
 
    Alcatel
    Bell Sygma Telecom
    British Telecom
    Broadband Technologies
    Deutsche Telekom
    LM Ericsson
    Mitel Corporation
    Nortel
    Qualcomm
    Siemens
 
INDEPENDENT SOFTWARE VENDORS AND SYSTEMS INTEGRATORS
 
    Andersen Consulting
    Attachmate
    CSC
    EDS
    IBM
    Microsoft
    Perot Systems
 
FINANCIAL SERVICES
 
    Bankers Trust Company
    Barclays Bank
    Chase Manhattan Bank
    CNA Insurance
    Deutsche Bank
    Fidelity Investments
    London Stock Exchange
    Merrill Lynch
    MetLife
    Morgan Guaranty
    Nomura International
    Prudential Insurance
    Smith Barney
    Standard Life Assurance
    Union Bank of Switzerland
    USF&G
    Zurich Cantonal Bank
 
AEROSPACE/DEFENSE
 
    Boeing
    Hughes
    Lockheed Martin
    Raytheon Company
    Texas Instruments
    TRW
 
TRANSPORTATION
 
    British Airways
    GEC-Alsthom
    Honeywell
    Hughes Air Traffic Systems
    Rockwell-Collins
 
SALES AND MARKETING
 
     Rational primarily employs a direct selling approach which couples sales of
its integrated software tools with high-value technical consulting services. The
Company has established a major-account direct sales and technical consulting
organization in the United States, Canada, Europe, and in the Asia/Pacific/Latin
America region. Rational's major-account direct sales and technical consulting
organization is based on a team-selling model organized around an Account
Representative and an average of three Software Engineering Specialists. The
Company's Software Engineering Specialists provide pre- and post-sales support,
and are the primary delivery mechanism for the Company's high-value technical
consulting services. Rational believes that its major-account sales and
technical consulting organization is a powerful asset, giving the Company the
resources to form lasting
 
                                       32
<PAGE>   33
 
relationships with its major customers. See "Risk Factors -- Dependence on Sales
Force and Other Channels of Distribution."
 
     The Company's major-account direct sales and technical consulting
organization is focused on large customers that directly depend on their
capability to develop software. The Company believes that additional
opportunities exist which may be pursued by the Company's direct sales force in
partnership with external service providers and VARs. The Company also believes
that it can exploit additional revenue opportunities by developing channels such
as telesales and the use of the World Wide Web for direct marketing, sales and
customer support. The Company believes that the development of these additional
channels will allow it to reach a broader base of customers and maintain direct
contact with them at a lower cost than other sales efforts.
 
     The Company's North American sales, marketing and professional service
organization consists of 322 individuals, operating out of corporate
headquarters in Santa Clara, California, field offices in other locations
throughout North America, the United Kingdom, France, Germany, Sweden,
Australia, Taiwan, India, South Korea and Brazil. The Company's direct
international operations are staffed almost exclusively by local personnel. The
Company also has distributors and resellers in North America and additional
distributors in Spain, Italy, Israel, Singapore, Korea, China, Japan and South
Africa.
 
     The Company has established a partnership with Osaka Gas Information
Systems Research Institute ("OGIS-RI"), a subsidiary of Osaka Gas and a provider
of object-oriented programming expertise in the Japanese market. OGIS-RI has
localized certain of Rational's tools, including the Windows and UNIX versions
of Rational Rose/C++, for the Japanese market, along with training materials on
software process and object technology. OGIS-RI currently markets, sells and
offers an extensive range of technical consulting and training services to
support the Rational Rose product line in Japan.
 
     In support of its sales efforts, the Company's marketing department
conducts comprehensive programs which include maintenance of an extensive home
page on the World Wide Web, an electronic subscription service for news
announcements about the Company, print advertising, direct mail, public
relations, trade shows and ongoing customer communications programs. The Company
also keeps its customers informed of advances in the field through a customer
newsletter, technical papers and other mailings.
 
PRODUCT PRICING
 
     The Company's software licenses are normally perpetual, fully-paid-up
floating licenses. The floating license limits the number of simultaneous users
in a network instead of being associated with a specific user or computer. The
Company also offers other kinds of licenses, such as node-locked licenses that
limit a software license to a single computer and project licenses that provide
selected Company tools to all the developers working on a specific project.
 
     The bulk of the Company's net product revenue in fiscal 1996 was derived
from sales of its Rose and Apex product families. Elements of the Rose family
range in price from $495 for a single-user PC version of Rational Rose, to
$2,400 for Rational Rose/Visual Basic on a PC, to $8,400 for a floating license
of Rational Rose/C++ on a UNIX workstation. Elements of the Apex family range in
price from $7,500 for an Apex C++ license on UNIX to $22,000 for an Apex Ada
license on UNIX. The Company's products are often sold in multiple quantities to
teams of software developers working together in a client/server environment.
The Company offers standard discounts based on dollar volume in a single
purchase order.
 
     The Company also offers a support program which entitles a licensee to
receive all enhancements and upgrades to the licensed product that are published
in the succeeding twelve month period, as well as certain other support
services. Annual fees for support generally range from 15% to 20% of the
software license fee.
 
                                       33
<PAGE>   34
 
     Rational's packaged training courses are offered in the form of
open-enrollment public courses and in-house courses at customer facilities, and
range from $1,750 per person for a typical four-day course, to between $3,000 to
$12,500 for in-house courses depending on the length of the course and the
maximum number of students in the class. Rational's packaged consulting services
range from approximately $50,000 to several hundred thousand dollars. Currently,
custom consulting is priced on a time-and-materials basis, although the Company
plans to bill more of its custom consulting on a project-by-project basis in the
future. Discounts are offered for engagements of 1,000, 2,000 and 6,000 hours of
consulting in a calendar year.
 
COMPETITION
 
     The marketplace for software engineering tools is intensely competitive.
Given the breadth of the Company's product lines, each product faces competition
from one or more sources. See "Risk Factors -- Competition."
 
     Rational faces competition from software development tools and processes
developed internally by customers, including ad hoc integrations of numerous
stand-alone development tools. The Company believes that its solution is
superior to such in-house efforts, which are frequently hampered by a lack of
understanding of the complexity involved in software development, a lack of
relevant expertise within the organization, limits on the amount of resources
made available for efforts that will benefit only a single product line or
organization and a reliance on traditional sequential development methods.
 
     The Company faces competition from Intersolv, Inc., Platinum Technology,
Inc., Select Software Tools plc and numerous privately held tool suppliers
offering traditional CASE tools that compete with the Rational Rose approach to
visual modeling and component-based development. Rational's Visual Test product
faces competition from SQA, Inc., Mercury Interactive Corporation, Segue
Software, Inc. and several private companies offering testing automation tools.
Rational Apex for C/C++ faces competition from major UNIX platform vendors such
as Sun Microsystems Inc., Hewlett-Packard Company and Digital Equipment
Corporation, which have C/C++ compilers and debuggers and in some cases
programming environments for their platforms. In addition, numerous privately
held companies offer compilers, debuggers and programming environments which
compete with Rational Apex. The Rational Summit product line faces competition
from Pure Atria Corporation and other suppliers offering change management
systems. Rational's Apex Ada and VADS product lines face competition from
Thomson Software Products, Green Hills Software, Inc. and a large number of
other suppliers offering Ada products for native and embedded systems.
 
     The Company believes that the major competitive factors in its markets are
corporate and product reputation, breadth of coverage by an integrated product
line, product architecture, functionality and features, product quality,
performance, ease of use, quality of support, availability of technical
consulting services and price. Rational believes that its combination of an
integrated family of products supporting component-based development throughout
the software development lifecycle and its emphasis on controlled iterative
development, visual modeling and an architecture-driven process, coupled with
its extensive major-account direct sales and technical consulting organization
and the supporting channels such as VARs, telesales and the World Wide Web, are
effective selling tools.
 
     The Company believes that the increased level of competition it observed in
fiscal 1996 will continue to increase. Because individual product sales are
often the first step in a broader customer relationship, the Company's success
depends in part upon its ability to successfully compete with numerous
competitors at each point within its product line. Certain of the Company's
competitors are more experienced than the Company in the development of
software-engineering tools, databases or software-development products. The
Company encounters substantial competition from in-house software tools
developers for large organizations. Some of the Company's competitors have, and
new competitors may have, larger technical staffs, more established distribution
channels and greater financial resources than the Company. There can be no
assurance that either existing or new competitors will not develop products that
are superior to the Company's products or that achieve greater market
acceptance. The Company's future success will depend in large part upon its
ability to
 
                                       34
<PAGE>   35
 
increase its share of its target markets and to license additional products and
product enhancements to existing customers. There can be no assurance that
future competition will not have a material adverse effect on the Company's
results of operations.
 
INTELLECTUAL PROPERTY
 
     Rational regards its software as proprietary and attempts to protect it
under a combination of copyright, trademark and trade secret laws, employee and
third-party non-disclosure agreements and other methods of protection. Despite
these precautions, it may be possible for unauthorized third parties to copy
certain portions of the Company's products or to reverse engineer or obtain and
use information the Company regards as proprietary. While Rational's competitive
position may be affected by its ability to protect its proprietary information,
the Company believes that trademark and copyright protections are less
significant to the Company's success than other factors, such as trade secret
protection, the knowledge, ability and experience of the Company's personnel,
name recognition and ongoing product development and support.
 
     Rational's software products are generally licensed to end users on a
"right to use" basis pursuant to a perpetual license. The Company licenses its
products primarily under "shrink wrap" licenses (i.e., licenses included as part
of the product packaging). Shrink wrap licenses are not negotiated with or
signed by individual licensees and purport to take effect upon the opening of
the product package. Certain provisions of such licenses, including provisions
protecting against unauthorized use, copying, transfer and disclosure of the
licensed program, may be unenforceable under the laws of certain jurisdictions.
In addition, the laws of some foreign countries do not protect Rational's
proprietary rights to the same extent as do the laws of the United States.
 
     As the number of software products in the industry increases and the
functionality of these products further overlaps, Rational believes that
software programs will increasingly become subject to infringement claims. There
can be no assurance that third parties will not assert infringement claims
against the Company in the future with respect to current or future products.
Any such assertion could require the Company to enter into royalty arrangements
or result in costly litigation. See "Risk Factors -- Limited Protection of
Intellectual Property and Proprietary Rights."
 
EMPLOYEES
 
     As of June 30, 1996, the Company employed 538 full-time personnel,
including 133 in product development, 322 in sales, marketing and technical
consulting and 83 in finance and administration. The Company's employees are not
represented by any collective bargaining organization, and the Company has never
experienced a work stoppage. The Company believes its success will depend in
part on its continued ability to attract and retain highly qualified personnel
in a competitive market for experienced and talented software engineers and
sales and marketing personnel. See "Risk Factors -- Dependence on Key
Personnel."
 
FACILITIES
 
     Rational's headquarters are located in a leased facility, located in Santa
Clara, California, consisting of approximately 94,000 square feet of office
space occupied under a lease expiring in January 2001, with a renewal option for
an additional five years. The Company also leases approximately 16,300 square
feet of office space in Aloha, Oregon under a lease expiring in January 1999,
and approximately 22,900 square feet of office space in McLean, Virginia under a
lease expiring in February 2001. Rational leases additional facilities and
offices, including locations in Alabama, California, Connecticut, Florida,
Maryland, Massachusetts, New York, Ohio, Pennsylvania, Virginia, Washington,
Wisconsin, London, Melbourne, Munich, Paris, Sao Paolo, Seoul, Stockholm, Taipei
and Canada. Rational believes that its existing facilities and offices, together
with additional space available to it, are adequate to meet its requirements for
the foreseeable future.
 
                                       35
<PAGE>   36
 
LEGAL PROCEEDINGS
 
     On December 1, 1995, Interactive Development Environments ("IDE") filed an
action against the Company in the San Francisco County Superior Court seeking
monetary damages in excess of $3 million and other relief for the Company's
alleged breach of an alleged contract, misrepresentation and related claims
based on the Company's preliminary, non-binding merger discussions in 1995 with
IDE. In March 1996, the Court sustained the Company's demurrer to IDE's claim
for specific performance of the alleged contract between the parties. Trial on
IDE's remaining claims is set for January 1997, although IDE has indicated its
desire to postpone the trial in order to seek to amend its complaint. The
Company believes IDE's complaints are without merit, although there can be no
assurance that the Company will be successful in defending the action. There are
no other material pending legal proceedings to which the Company is a party or
to which any of the Company's property is the subject.
 
                                       36
<PAGE>   37
 
                                   MANAGEMENT
 
DIRECTORS AND EXECUTIVE OFFICERS
 
     The directors and executive officers of the Company are as follows:
 
<TABLE>
<CAPTION>
          NAME             AGE                              POSITION
- -------------------------  ---     -----------------------------------------------------------
<S>                        <C>     <C>
Paul D. Levy.............  41      Chairman of the Board and Chief Executive Officer
Michael T. Devlin........  41      President and Director
Robert T. Bond...........  53      Senior Vice President, Chief Operating Officer, Chief
                                   Financial Officer, and Secretary
David H. Bernstein.......  44      Senior Vice President and General Manager, Products
John R. Lovitt...........  51      Senior Vice President, North American Field Operations
Stephen F. Zeigler.......  45      Senior Vice President and General Manager, UNIX Application
                                     Construction Products
Timothy A. Brennan.......  41      Vice President, Finance and Administration
Kevin J. Haar............  39      Vice President, Major Accounts, North American Field
                                     Operations
Ivar Jacobson............  57      Vice President, Business Engineering
Joseph N. Marasco........  51      Vice President and General Manager, Windows Application
                                     Construction Products
Gregory L. Meyers........  40      Vice President and General Manager, Object Modeling
                                   Products
Richard P. Reitman.......  44      Vice President, Process and Project Management Products
Gerard J. Rudisin........  42      Vice President, Corporate Marketing
James S. Campbell........  69      Director
Daniel H. Case III(2)....  39      Director
Leslie G. Denend(1)......  55      Director
John E. Montague(2)......  42      Director
Allison R.                 52      Director
  Schleicher(1)..........
</TABLE>
 
- ------------------------------
(1) Member of Compensation Committee
 
(2) Member of Audit Committee
 
     Paul D. Levy co-founded Rational in 1981. He is currently Chairman of the
Board and Chief Executive Officer. Prior to September 1996, Mr. Levy served as
President and Chief Executive Officer of the Company. Mr. Levy received a B.S.
degree in economics from the United States Air Force Academy and an M.S. degree
in engineering-economic systems from Stanford University. Mr. Levy is a director
of Peerless Systems Corporation. Mr. Levy is the son-in-law of Mr. Campbell.
 
     Michael T. Devlin co-founded Rational in 1981. He is currently President
and a director. Prior to September 1996, Mr. Devlin served as Chairman of the
Board of the Company. Mr. Devlin received a B.S. degree in computer science from
the United States Air Force Academy and an M.S. degree in computer science from
Stanford University.
 
     Robert T. Bond joined Rational in 1983 as Vice President of Marketing. In
1990, he was named Senior Vice President and General Manager of International
Field Operations. In April, 1996 he was named Senior Vice President, Chief
Operating Officer, Chief Financial Officer and Secretary of the Company. Mr.
Bond has a B.S. degree in engineering from Case Institute of Technology.
 
     David H. Bernstein joined Rational in 1982 as Vice President, Product
Development. Mr. Bernstein was named Vice President and General Manager, Object
Technology Products, and Senior Vice President and General Manager, Object
Technology Products in 1994 and 1995, respectively. In May 1996, Mr. Bernstein
was named Senior Vice President and General Manager, Products. Mr. Bernstein
received a B.S. degree in electrical engineering from the Massachusetts
Institute of Technology.
 
                                       37
<PAGE>   38
 
     John R. Lovitt joined Rational as a Regional Manager responsible for sales
and marketing in 1986. In 1990, he was promoted to Vice President, and
subsequently Senior Vice President, North American Field Operations, where he is
responsible for field marketing and technical services in North America. Mr.
Lovitt received a B.S. degree in aeronautical engineering from Wichita State and
an M.S. degree in computer science from the University of Missouri.
 
     Stephen F. Zeigler joined the Company in 1983 as an Engineering Manager.
Mr. Zeigler was named Vice President, Ada Products and Senior Vice President,
Ada Products in 1987 and 1994, respectively. Since April 1996, Mr. Ziegler has
served as Senior Vice President and General Manager, UNIX Application
Construction Products. He received his B.A. in math, physics, and chemistry from
Illinois College, his M.S. in computer science from Indiana University and his
doctorate in computer science from the University of Wisconsin.
 
     Timothy A. Brennan is Vice President, Finance and Administration. He joined
Rational as Corporate Controller in 1994. From 1987 to 1994, Mr. Brennan held
various financial management and controllership positions with The ASK Group,
Inc. Mr. Brennan received a B.S.C. in accounting from Santa Clara University. He
is a certified public accountant in the State of California.
 
     Kevin J. Haar is Vice President, Major Accounts, North American Field
Operations. He joined Rational in 1986 as an account representative in the field
sales force. Since then, he has held a number of positions, most recently
District Manager and Eastern Regional Manager. Mr. Haar received a B.S. in
electrical engineering and an M.B.A. from Washington University in St. Louis.
 
     Ivar Jacobson joined Rational as Vice President, Business Engineering in
1995, when the Company acquired Objectory AB. Prior to joining the Company, Mr.
Jacobson served as President of Objectory AB from 1990 to 1991, and as Vice
President of Objectory AB from 1991 to 1995. Mr. Jacobson received an M.S. in
Electrical Engineering from Chalmers Institute of Technology, Gothenberg and his
doctorate in computer systems from the Royal Institute of Technology in
Stockholm.
 
     Joseph N. Marasco is Vice President and General Manager, Windows
Application Construction Products. He joined Rational in 1986 as a product
manager. He has since held various positions in the Company, including Director
of Product Marketing, Director of Consulting Services and Director of
Engineering for the Apex product line. He has an M.S. degree in physics from
State University of New York at Stony Brook and a Ph.D. in physics from the
University of Geneva, Switzerland.
 
     Gregory L. Meyers joined Rational as Director of Rose Development in 1995,
when the Company acquired Palladio Software Corporation. In April 1996, Mr.
Meyers was named Vice President and General Manager, Object Modeling Products.
Prior to joining Rational, Mr. Meyers served as Project Manager at General
Electric Medical Systems from 1990 to 1992, and as Chief Architect, Software
Tools at Palladio Software Corporation from 1992 to 1995. Mr. Meyers received
his B.S. in engineering from the University of Iowa.
 
     Richard P. Reitman joined the Company in 1982. From 1991 to 1993, he served
as Product Architect, and from 1993 until 1996 he served as Chief Product
Architect of the Company. Mr. Reitman now serves as Vice President, Process and
Project Management Products. Mr. Reitman received a B.A. in mathematics from
State University of New York, New Paltz, New York, an M.S. in computer science
and his doctorate in computer science from Cornell University. Since March 1996,
Mr. Reitman has also been Chairman and Secretary of Reitman Corp. Medical
Regulatory Consulting, a business consulting firm unaffiliated with the Company.
 
     Gerard J. Rudisin joined Rational in 1991 as Director of Marketing for
Rational's Ada products. In 1993 he was named Vice President, Corporate
Marketing. Mr. Rudisin received a B.S. degree in electrical engineering from the
Massachusetts Institute of Technology and an M.S. degree in computer science
from University of California, Los Angeles.
 
     James S. Campbell has been a director of the Company since 1990. Since
1987, he has been the Managing Director of Management Partners International
Corporation, a management and consulting
 
                                       38
<PAGE>   39
 
firm specializing in technology companies. He serves on the national board of
directors of United We Stand America, Inc. and is a Director of Applied Voice
Technology, Inc. Mr. Campbell is the father-in-law of Mr. Levy.
 
     Daniel H. Case III has been a director of Rational since 1993. Since 1994,
he has been President and Chief Executive Officer of Hambrecht & Quist Group, an
investment banking firm. From 1992 to 1994 he served as President and Co-Chief
Executive Officer of Hambrecht & Quist Group. Previously he held various
positions with Hambrecht & Quist Group. He is a director of Hambrecht & Quist
Group and Electronics Arts, Inc.
 
     Leslie G. Denend has been a director of the Company since 1993. Since 1993,
he has been the President and Chief Executive Officer of Network General
Corporation, a supplier of local and wide area computer network communications
management systems. From 1990 to 1992, he was President of Vitalink
Communications. He is a director of Network General Corporation, McAfee
Corporation and Proxim, Inc.
 
     John E. Montague has been a director of the Company since 1994. Since March
15, 1995, he has been Vice President, Financial Strategies at Lockheed Martin
Corporation. Previously, he was Vice President, Corporate Development and
Investor Relations at Martin Marietta Corporation. From 1988 to 1991, he was
Director, Corporate Development at Martin Marietta Corporation.
 
     Allison R. Schleicher has been a director of the Company since 1990. Since
1967, he has been with IBM Corporation in various executive and management
positions. Most recently in 1994, he was appointed Vice President, Finance of
IBM Credit Corporation.
 
                                       39
<PAGE>   40
 
                       PRINCIPAL AND SELLING STOCKHOLDERS
 
     The following table sets forth the beneficial ownership of Common Stock of
the Company as of September 30, 1996 and as adjusted to reflect the sale of the
shares offered by this Prospectus (assuming no exercise of the Underwriter's
over-allotment option), by (i) all persons known to the Company to be the
beneficial owners of more than 5% of the Company's Common Stock, (ii) the
Company's Chief Executive Officer and the four most highly compensated executive
officers other than the Chief Executive Officer, (iii) each Selling Stockholder,
(iv) each of the Company's directors and (v) all directors and executive
officers as a group. The information on beneficial ownership in the table and
the footnotes below is based upon the Company's records, Schedule 13D and 13G
filings and information supplied to the Company by the listed person or entity.
 
     The following table has been prepared in accordance with Rule 13d-3 of the
Securities Exchange Act of 1934 and discloses all securities beneficially owned
by the named persons as of September 30, 1996, plus all securities which such
persons have a right to acquire through the exercise of options or other rights
within 60 days of September 30, 1996. Certain individuals in the table below
have the right to acquire additional shares after such 60-day period, as
indicated in the footnotes to the table.
 
<TABLE>
<CAPTION>
                                                      SHARES BENEFICIALLY       SHARES BENEFICIALLY
                                                      OWNED PRIOR TO THE          OWNED AFTER THE
                                                           OFFERING                  OFFERING
       DIRECTORS, OFFICERS, 5% STOCKHOLDERS          ---------------------     ---------------------
             AND SELLING STOCKHOLDERS                 NUMBER       PERCENT      NUMBER       PERCENT
- ---------------------------------------------------  ---------     -------     ---------     -------
<S>                                                  <C>           <C>         <C>           <C>
Putnam Investments.................................  6,790,644       19.7%     6,790,644       17.6%
FMR Corp...........................................  2,359,000        6.8%     2,359,000        6.1%
The Kaufmann Fund, Inc.............................  1,960,000        5.7%     1,960,000        5.1%
AIM Management Group...............................  1,947,000        5.6%     1,947,000        5.0%
Ivar Jacobson(1)...................................    920,044        2.7%       507,500        1.3%
Ericsson Inc.(2)...................................    544,174        1.6%            --          *
Paul D. Levy(3)....................................         --          *             --          *
Michael T. Devlin(4)...............................         --          *             --          *
Robert T. Bond(5)..................................    114,970          *        114,970          *
David H. Bernstein(6)..............................     56,666          *         56,666          *
Kevin J. Haar(7)...................................     56,632          *         56,632          *
Daniel H. Case III(8)..............................     36,329          *         36,329          *
Leslie G. Denend(9)................................     29,164          *         29,164          *
Allison R. Schleicher(10)..........................     21,498          *         21,498          *
James S. Campbell(11)..............................     15,248          *         15,248          *
John E. Montague(12)...............................        600          *            600          *
All current directors and current executive
  officers
  as a group (18 persons)(13)......................  1,707,989        4.9%     1,295,445        3.3%
</TABLE>
 
- ------------------------------
  *  Less than one percent.
 
 (1) Includes 7,500 shares purchasable by Mr. Jacobson within 60 days of
     September 30, 1996, upon exercise of outstanding stock options. Mr.
     Jacobson holds additional options for the purchase of 22,500 shares of the
     Company's Common Stock, which vest at various times following such 60-day
     period.
 
 (2) Ericsson Inc. is a subsidiary of LM Ericsson, which originally acquired
     these shares in connection with the Company's acquisition of Objectory AB.
 
 (3) Mr. Levy holds options for the purchase of 475,000 shares of the Company's
     Common Stock, which vest at various times following the 60-day period
     commencing on September 30, 1996. The Board of Directors of the Company has
     agreed to grant Mr. Levy an additional option for the purchase of 200,000
     shares of Common Stock on January 1, 1997, which will vest over a four-year
     period and will have an exercise price equal to the fair market value of
     the Company's Common Stock on the date of grant.
 
                                       40
<PAGE>   41
 
 (4) Mr. Devlin holds options for the purchase of 475,000 shares of the
     Company's Common Stock, which vest at various times following the 60-day
     period commencing on September 30, 1996. The Board of Directors of the
     Company has agreed to grant Mr. Devlin an additional option for the
     purchase of 200,000 shares of Common Stock on January 1, 1997, which will
     vest over a four-year period and will have an exercise price equal to the
     fair market value of the Company's Common Stock on the date of grant.
 
 (5) Includes 94,498 shares purchasable by Mr. Bond within 60 days of September
     30, 1996, upon exercise of outstanding stock options. Mr. Bond holds
     additional options for the purchase of 210,834 shares of the Company's
     Common Stock, which vest at various times following such 60-day period.
 
 (6) Includes 26,666 shares purchasable by Mr. Bernstein within 60 days of
     September 30, 1996, upon exercise of outstanding stock options. Mr.
     Bernstein holds additional options for the purchase of 143,334 shares of
     the Company's Common Stock, which vest at various times following such
     60-day period.
 
 (7) Includes 52,998 shares purchasable by Mr. Haar within 60 days of September
     30, 1996, upon exercise of outstanding stock options. Mr. Haar holds
     additional options for the purchase of 76,334 shares of the Company's
     Common Stock, which vest at various times following such 60-day period.
 
 (8) Includes 32,498 shares purchasable by Mr. Case within 60 days of September
     30, 1996, upon exercise of outstanding stock options. Mr. Case holds
     additional options for the purchase of 37,834 shares of the Company's
     Common Stock, which vest at various times following such 60-day period.
 
 (9) Includes 29,164 shares purchasable by Mr. Denend within 60-days of
     September 30, 1996, upon exercise of outstanding stock options. Mr. Denend
     holds additional options for the purchase of 51,168 shares of the Company's
     Common Stock, which vest at various times following such 60-day period.
 
(10) Includes 21,498 shares purchasable by Mr. Schleicher within 60 days of
     September 30, 1996, upon exercise of outstanding stock options. Mr.
     Schleicher holds additional options for the purchase of 62,834 shares of
     the Company's Common Stock, which vest at various times following such
     60-day period.
 
(11) Includes 14,582 shares purchasable by Mr. Campbell within 60 days of
     September 30, 1996, upon exercise of outstanding stock options. Mr.
     Campbell holds additional options for the purchase of 50,334 shares of the
     Company's Common Stock, which vest at various times following such 60-day
     period.
 
(12) Mr. Montague holds options for the purchase of 68,000 shares of the
     Company's Common Stock, which vest at various times following the 60-day
     period commencing on September 30, 1996.
 
(13) Includes 599,213 shares purchasable within 60 days of September 30, 1996,
     upon exercise of outstanding stock options. Such persons also hold
     additional options for the purchase of an aggregate of 2,126,707 shares of
     the Company's Common Stock, which vest at various times following such
     60-day period.
 
                                       41
<PAGE>   42
 
                          DESCRIPTION OF CAPITAL STOCK
 
     The Company's authorized capital stock consists of 75,000,000 shares of
Common Stock.
 
COMMON STOCK
 
     The holders of Common Stock are entitled to one vote per share on all
matters submitted to a vote of stockholders. Holders of Common Stock also are
entitled to receive ratably such dividends are may be declared by the Board of
Directors out of funds legally available therefor. See "Price Range of Common
Stock and Dividend Policy." In the event of liquidation, dissolution or winding
up of the Company, holders of Common Stock are entitled to share ratably in all
assets remaining after payment of liabilities. Holders of Common Stock have no
preemptive, subscription, redemption or conversion rights. All outstanding
shares of Common Stock are, and the shares of Common Stock offered hereby will
be, when issued against the consideration set forth in this Prospectus, fully
paid and nonassessable.
 
REGISTRATION RIGHTS
 
     Ivar Jacobson has been granted certain demand and "piggyback" registration
rights with respect to shares of the Company's Common Stock pursuant to an
agreement between UseCase Engineering S.A. and the Company. Mr. Jacobson has
agreed to a lock-up expiring 90 days following effectiveness of the offering
made hereby with respect to the portion of his holdings not being offered
hereby. The exercise by Mr. Jacobson of his registration rights or other sale of
his holdings following the expiration of such 90-day period could have an
adverse impact on the market for shares of the Company's Common Stock.
 
TRANSFER AGENT AND REGISTRAR
 
     The Transfer Agent and Registrar for the Company's Common Stock is
ChaseMellon Shareholder Services of California.
 
                                       42
<PAGE>   43
 
                                  UNDERWRITING
 
     Subject to the terms and conditions of the Underwriting Agreement, the
Underwriters named below, through their Representatives, Hambrecht & Quist LLC,
Goldman, Sachs & Co. and Wessels, Arnold & Henderson, L.L.C., have severally
agreed to purchase from the Company and the Selling Stockholders the following
respective number of shares of Common Stock.
 
<TABLE>
<CAPTION>
                                                                            NUMBER OF
                                       NAME                                  SHARES
        ------------------------------------------------------------------  ---------
        <S>                                                                 <C>
        Hambrecht & Quist LLC.............................................
        Goldman, Sachs & Co...............................................
        Wessels, Arnold & Henderson, L.L.C................................
                                                                            ---------
             Total........................................................  5,106,718
                                                                            =========
</TABLE>
 
     The Underwriting Agreement provides that the obligations of the
Underwriters are subject to certain conditions precedent, including the absence
of any material adverse change in the Company's business and the receipt of
certain certificates, opinions and letters from the Company, its counsel and
independent auditors. The nature of the Underwriters' obligation is such that
they are committed to purchase all shares of Common Stock offered hereby if any
of such shares are purchased.
 
     The Underwriters propose to offer the shares of Common Stock directly to
the public at the offering price set forth on the cover of this Prospectus and
to certain dealers at such price less a concession not in excess of $
per share. The Underwriters may allow, and such dealers may reallow, a
concession not in excess of $          per share to certain other dealers. After
the public offering of the shares, the offering price and other selling terms
may be changed by the Underwriters.
 
     The Company has granted to the Underwriters an option, exercisable no later
than 30 days after the date of this Prospectus, to purchase up to an additional
766,007 shares of Common Stock at the public offering price, less the
underwriting discount, set forth on the cover page of this Prospectus. To the
extent that the Underwriters exercise this option, each of the Underwriters will
have a firm commitment to purchase approximately the same percentage thereof
which the number of shares of Common Stock to be purchased by it shown in the
above table bears to the total number of shares of Common Stock offered hereby.
The Company will be obligated, pursuant to the option, to sell such shares to
the Underwriters to the extent the option is exercised. The Underwriters may
exercise such option only to cover over-allotments made in connection with the
sale of shares of Common Stock offered hereby.
 
     The offering of the shares is made for delivery when, as and if accepted by
the Underwriters and subject to prior sale and to withdrawal, cancellation or
modification of the offering without notice. The Underwriters reserve the right
to reject an order for the purchase of shares in whole or in part.
 
     The Company and the Selling Stockholders have agreed to indemnify the
Underwriters against certain liabilities, including liabilities under the
Securities Act, and to contribute to payments the Underwriters may be required
to make in respect thereof.
 
     The Company and its executive officers and directors and the Selling
Stockholders have agreed that they will not, without the prior written consent
of Hambrecht & Quist LLC, offer, sell or otherwise dispose of any shares of
Common Stock, options or warrants to acquire shares of Common Stock or
securities exchangeable for or convertible into shares of Common Stock owned by
them during the 90-day period following the date of this Prospectus, except that
the Company may issue shares upon the exercise of options granted prior to the
date hereof, may grant additional options under its stock option plans, and may
issue shares pursuant to the Company's stock purchase plan.
 
                                       43
<PAGE>   44
 
     In general, the rules of the Commission will prohibit the Underwriters from
making a market in the Company's Common Stock during the "cooling off" period
immediately preceding the commencement of sales in the offering. The Commission
has, however, adopted exemptions from these rules that permit passive market
making under certain conditions. These rules permit an underwriter to continue
to make a market subject to the conditions, among others, that its bid not
exceed the highest bid by a market maker not connected with the offering and
that its net purchases on any one trading day not exceed prescribed limits.
Pursuant to these exemptions, certain Underwriters, selling group members (if
any) or their respective affiliates intend to engage in passive market making in
the Company's Common Stock during the cooling off period.
 
     Daniel H. Case III, a director and stockholder of the Company, is the
President and Chief Executive Officer and a shareholder of Hambrecht & Quist
Group, the parent entity of Hambrecht & Quist LLC. Mr. Case, together with
affiliates and venture funds associated with Hambrecht & Quist Group, owns less
than 1% of the outstanding shares of the Company's Common Stock. Mr. Case may be
deemed to have voting or investment power with respect to certain of the shares
held by Hambrecht & Quist Group affiliates.
 
                                 LEGAL MATTERS
 
     The validity of the Common Stock offered hereby will be passed upon for the
Company and the Selling Stockholders by Wilson Sonsini Goodrich & Rosati,
Professional Corporation, Palo Alto, California. Certain legal matters will be
passed upon for the Underwriters by Cooley Godward LLP, Palo Alto, California.
 
                                    EXPERTS
 
     The consolidated financial statements of Rational Software Corporation at
March 31, 1995 and 1996, and for each of the three years in the period ending
March 31, 1996, appearing in this Prospectus and Registration Statement have
been audited by Ernst & Young LLP, independent auditors, as set forth in their
reports thereon appearing elsewhere herein and are included in reliance upon
such reports, given upon the authority of such firm as experts in accounting and
auditing.
 
                                       44
<PAGE>   45
 
                         RATIONAL SOFTWARE CORPORATION
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
Report of Ernst & Young LLP, Independent Auditors.....................................  F-2
Consolidated Statements of Operations.................................................  F-3
Consolidated Balance Sheets...........................................................  F-4
Consolidated Statements of Stockholders' Equity.......................................  F-5
Consolidated Statements of Cash Flows.................................................  F-6
Notes to Consolidated Financial Statements............................................  F-7
</TABLE>
 
                                       F-1
<PAGE>   46
 
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS
 
The Board of Directors and Stockholders
Rational Software Corporation
 
     We have audited the accompanying consolidated balance sheets of Rational
Software Corporation as of March 31, 1996 and 1995, and the related consolidated
statements of operations, stockholders' equity, and cash flows for each of the
three years in the period ended March 31, 1996. 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 consolidated financial statements referred to above
present fairly, in all material respects, the consolidated financial position of
Rational Software Corporation at March 31, 1996 and 1995, and the consolidated
results of its operations and its cash flows for each of the three years in the
period ended March 31, 1996, in conformity with generally accepted accounting
principles.
 
                                                               ERNST & YOUNG LLP
 
San Jose, California
April 22, 1996
 
                                       F-2
<PAGE>   47
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                                                  THREE MONTHS
                                            FISCAL YEARS ENDED MARCH 31,         ENDED JUNE 30,
                                          --------------------------------     -------------------
                                            1994        1995        1996        1995        1996
                                          --------     -------     -------     -------     -------
                                                                                   (UNAUDITED)
<S>                                       <C>          <C>         <C>         <C>         <C>
Net product revenue.....................  $ 41,716     $39,221     $55,899     $11,454     $17,300
Consulting and support revenue..........    28,627      33,678      35,208       8,303      10,161
                                          --------     -------     -------     -------     -------
     Total revenue*.....................    70,343      72,899      91,107      19,757      27,461
                                          --------     -------     -------     -------     -------
Cost of product revenue.................    11,862       6,955       7,196       1,250       1,825
Cost of consulting and support
  revenue...............................    13,494      18,095      19,336       4,763       5,499
                                          --------     -------     -------     -------     -------
     Total cost of revenue..............    25,356      25,050      26,532       6,013       7,324
                                          --------     -------     -------     -------     -------
Gross profit............................    44,987      47,849      64,575      13,744      20,137
Operating expenses:
  Research and development..............    20,221      12,187      15,939       3,171       4,495
  Sales and marketing...................    21,338      25,100      35,000       7,666       8,877
  General and administrative............     7,194       6,995       9,511       1,711       2,399
  Charges for acquired in-process
     research and development...........     --          --          8,700       --          --
  Merger and restructuring costs........     9,922      (1,100)      --          --          --
                                          --------     -------     -------     -------     -------
     Total operating expenses...........    58,675      43,182      69,150      12,548      15,771
                                          --------     -------     -------     -------     -------
Income (loss) from continuing
  operations............................   (13,688)      4,667      (4,575)      1,196       4,366
Other income, net.......................       285         417       1,582         180         533
                                          --------     -------     -------     -------     -------
Income (loss) from continuing operations
  before provision for income taxes.....   (13,403)      5,084      (2,993)      1,376       4,899
Provision for income taxes..............       404         406       1,028         110         735
                                          --------     -------     -------     -------     -------
Income (loss) from continuing
  operations............................   (13,807)      4,678      (4,021)      1,266       4,164
Discontinued operations:
  Loss from the disposal of the secure-
     products business..................      (175)      --          --          --          --
                                          --------     -------     -------     -------     -------
  Net income (loss).....................  $(13,982)    $ 4,678     $(4,021)    $ 1,266     $ 4,164
                                          ========     =======     =======     =======     =======
Income (loss) from continuing operations
  per common share......................     $(.57)       $.19       $(.13)       $.04        $.11
Net income (loss) per common share......      (.57)        .19        (.13)        .04         .11
Shares used in computing per share
  amounts...............................    24,394      25,212      30,725      28,536      36,930
*Revenue from related parties...........    $8,852      $3,324      $4,000        $291       $--
</TABLE>
 
                See Notes to Consolidated Financial Statements.
 
                                       F-3
<PAGE>   48
 
                          CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                                         JUNE 30,
                                                                                           1996
                                                            MARCH 31,     MARCH 31,     -----------
                                                              1995          1996
                                                            ---------     ---------     (UNAUDITED)
<S>                                                         <C>           <C>           <C>
ASSETS
Cash and cash equivalents.................................  $   9,440     $  43,934      $  41,448
Short-term investments....................................      1,036         8,711         11,474
Accounts receivable, net of allowance for doubtful
  accounts of $478, $1,042 and $1,046 at March 31, 1995,
  1996 and June 30, 1996, respectively:
Trade receivables.........................................     18,204        23,408         21,472
Trade receivables from related parties....................        537        --             --
Prepaid expenses and other assets.........................        766         2,074          2,512
                                                             --------      --------       --------
          Total current assets............................     29,983        78,127         76,906
Property and equipment, at cost:
  Computer, office and manufacturing equipment............     25,467        22,779         24,078
  Office furniture........................................      2,725         2,109          2,115
  Leasehold improvements..................................      1,264         1,209          1,227
                                                             --------      --------       --------
                                                               29,456        26,097         27,420
  Accumulated depreciation and amortization...............    (23,339)      (20,715)       (21,533)
                                                             --------      --------       --------
     Property and equipment, net..........................      6,117         5,382          5,887
Other assets..............................................      1,900         2,165          2,004
                                                             --------      --------       --------
          Total assets....................................  $  38,000     $  85,674      $  84,797
                                                             ========      ========       ========
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable..........................................  $   2,331     $   2,983      $   3,005
Accrued employee benefits.................................      5,619         8,476          5,769
Accrued royalties.........................................      1,665           799            517
Other accrued expenses....................................      1,824         3,486          4,031
Accrued merger and restructuring expenses.................        449           575            490
Deferred revenue..........................................      7,781        15,606         11,557
Current portion of long-term debt and lease obligations:
  Related parties.........................................      2,163        --             --
  Other...................................................        409           654            151
                                                             --------      --------       --------
          Total current liabilities.......................     22,241        32,579         25,520
Accrued rent..............................................      1,260           880            706
Long-term accrued merger and restructuring expenses.......      1,764         1,309          1,216
Long-term debt and lease obligations, less current
  portion:
  Related parties.........................................        488        --             --
  Other...................................................        163        --             --
                                                             --------      --------       --------
          Total liabilities...............................     25,916        34,768         27,442
Commitments and contingencies
Stockholders' equity:
  Common Stock, $.01 par value, 75,000 shares authorized
     (see Note 11), issued and outstanding 25,050, 33,623
     and 34,442 shares as of March 31, 1995 and 1996 and
     June 30, 1996, respectively..........................        251           336            344
Additional paid-in capital................................     71,147       113,771        116,302
Treasury stock............................................     (1,340)       (1,340)        (1,340)
Accumulated deficit.......................................    (57,974)      (61,995)       (57,831)
Cumulative translation adjustment.........................     --               134           (120)
                                                             --------      --------       --------
          Total stockholders' equity......................     12,084        50,906         57,355
                                                             --------      --------       --------
          Total liabilities and stockholders' equity......  $  38,000     $  85,674      $  84,797
                                                             ========      ========       ========
</TABLE>
 
                See Notes to Consolidated Financial Statements.
 
                                       F-4
<PAGE>   49
 
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                      COMMON STOCK     ADDITIONAL                            CUMULATIVE         TOTAL
                                     ---------------    PAID-IN     TREASURY   ACCUMULATED   TRANSLATION    STOCKHOLDERS'
                                     SHARES   AMOUNTS   CAPITAL      STOCK       DEFICIT     ADJUSTMENT        EQUITY
                                     ------   ------   ----------   --------   -----------   ----------   -----------------
<S>                                  <C>      <C>      <C>          <C>        <C>           <C>          <C>
Balance at March 31, 1993..........  24,592    $246     $ 69,756    $  --       $ (42,957)     $--            $  27,045
Exercise of common stock options...     138       1          339       --          --           --                  340
Repurchase of stock................      (2)   --             (2)      --          --           --                   (2)
Recovery of pooling shares.........     (38)   --         --           --          --           --             --
Purchase of treasury shares........    --      --         --          (1,394)      --           --               (1,394)
Net loss...........................    --      --         --           --         (13,982)      --              (13,982)
Net transactions of old Rational
  eliminated during period from
  December 26, 1993 to March 31,
  1994.............................      68       1          192       --          (5,713)      --               (5,520)
                                     ------     ---      -------      ------      -------        ----          --------
Balance at March 31, 1994..........  24,764     248       70,285      (1,394)     (62,652)      --                6,487
Exercise of common stock options...     220       2          636       --          --           --                  638
Issuance of common stock...........      66       1          226       --          --           --                  227
Issuance of treasury stock.........    --      --         --              54       --           --                   54
Net income.........................    --      --         --           --           4,678       --                4,678
                                     ------     ---      -------      ------      -------        ----          --------
Balance at March 31, 1995..........  25,050     251       71,147      (1,340)     (57,974)      --               12,084
Issuance of common stock, net of
  expenses of $852.................   5,759      57       29,888       --          --           --               29,945
Issuance of common stock for the
  acquisition of Objectory AB......   1,497      15        8,754       --          --           --                8,769
Exercise of common stock options...   1,167      12        3,305       --          --           --                3,317
Issuance of common stock under
  Employee Stock Purchase Plan.....     150       1          448       --          --           --                  449
Compensation expense for stock
  option grants....................    --      --            229       --          --           --                  229
Cumulative translation
  adjustment.......................    --      --         --           --          --             134               134
Net loss...........................    --      --         --           --          (4,021)      --               (4,021)
                                     ------     ---      -------      ------      -------        ----          --------
Balance at March 31, 1996..........  33,623     336      113,771      (1,340)     (61,995)        134            50,906
Exercise of common stock options
  (unaudited)......................     450       4        1,295       --          --           --                1,299
Issuance of common stock under
  Employee Stock Purchase Plan
  (unaudited)......................     369       4        1,200       --          --           --                1,204
Compensation expense for stock
  option grants (unaudited)........    --      --             36       --          --           --                   36
Cumulative translation adjustment
  (unaudited)......................    --      --         --           --          --            (254)             (254)
Net income (unaudited).............    --      --         --           --           4,164       --                4,164
                                     ------     ---      -------      ------      -------        ----          --------
Balance at June 30, 1996
  (unaudited)......................  34,442    $344     $116,302    $ (1,340)   $ (57,831)     $ (120)        $  57,355
                                     ======     ===      =======      ======      =======        ====          ========
</TABLE>
 
                See Notes to Consolidated Financial Statements.
 
                                       F-5
<PAGE>   50
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                             FISCAL YEARS ENDED           THREE MONTHS
                                                                  MARCH 31,              ENDED JUNE 30,
                                                        -----------------------------   -----------------
                                                          1994      1995       1996      1995      1996
                                                        --------   -------   --------   -------   -------
                                                                                           (UNAUDITED)
<S>                                                     <C>        <C>       <C>        <C>       <C>
OPERATING ACTIVITIES:
Net income (loss).....................................  $(13,982)  $ 4,678   $ (4,021)  $ 1,266   $ 4,164
Adjustments to reconcile net income to net cash
  provided by operating activities:
  Charges for acquired in-process research and
     development......................................     --        --         8,700     --        --
  Depreciation and amortization.......................    10,056     4,980      4,577     1,558       970
  Compensation expense for stock option grants........     --        --           229     --           36
  Deferred income taxes...............................       478     --         --        --        --
  Loss from the disposal of discontinued operations...       175     --         --        --        --
  Loss on disposal of property and equipment, net of
     accumulated depreciation.........................       306     --         --        --        --
  Other...............................................        40     --         --        --        --
  Sale of discontinued operations.....................       778     --         --        --        --
(Increase) decrease in assets:
  Accounts receivable.................................     4,427    (3,738)    (2,830)   (1,707)    1,936
  Prepaid expenses and other assets...................     1,447       385       (520)     (157)     (429)
  Net assets of discontinued operations...............      (688)    --         --        --        --
Increase (decrease) in liabilities:
  Accounts payable....................................       (29)      915     (1,640)      647        22
  Other accrued expenses..............................     4,204    (2,135)     1,570     (2692)    (2872)
  Accrued merger and restructuring expenses...........     6,275    (4,062)      (329)     (296)     (178)
  Deferred revenue....................................     1,323       678      7,825      (551)   (4,049)
Net decrease in cash and cash equivalents of old
  Rational for the period from December 26, 1993 to
  March 31, 1994......................................    (4,722)    --         --        --        --
                                                        --------   -------   --------   -------   -------
          Total adjustments...........................    24,070    (2,977)    17,582    (3,198)   (4,564)
                                                        --------   -------   --------   -------   -------
  Net cash provided by (used in) operating
     activities.......................................    10,088     1,701     13,561    (1,932)     (400)
INVESTING ACTIVITIES:
Purchase of short-term investments....................    (6,891)   (2,369)   (11,124)     (984)   (7,639)
Maturities and sales of short-term investments........    10,024     7,581      3,449       980      4876
Cash acquired from purchase of subsidiary.............     --        --           279     --        --
Additions to computer software costs..................    (1,931)     (154)     --        --        --
Purchase of property and equipment....................    (5,280)   (3,222)    (2,812)     (710)   (1,323)
                                                        --------   -------   --------   -------   -------
     Net cash provided by (used in) investing
       activities.....................................    (4,078)    1,836    (10,208)     (714)   (4,086)
FINANCING ACTIVITIES:
Principal payments under long-term debt and capital
  leases..............................................    (1,345)   (2,455)    (2,569)     (630)     (503)
Proceeds from the issuance of common stock............       529       865     33,710    30,783     2,503
Repayment of notes payable............................    (1,687)    --         --        --        --
Issuance (purchase) of treasury stock.................    (1,394)       54      --        --        --
Other.................................................      (238)    --         --        --        --
                                                        --------   -------   --------   -------   -------
Net cash provided by (used in) financing activities...    (4,135)   (1,536)    31,141    30,153     2,000
                                                        --------   -------   --------   -------   -------
     Net increase in cash and cash equivalents........     1,875     2,001     34,494    27,507    (2,486)
Cash and cash equivalents at the beginning of the
  year................................................     5,564     7,439      9,440     9,440    43,934
                                                        --------   -------   --------   -------   -------
Cash and cash equivalents at the end of the year......  $  7,439   $ 9,440   $ 43,934   $36,947   $41,448
                                                        ========   =======   ========   =======   =======
</TABLE>
 
                See Notes to Consolidated Financial Statements.
 
                                       F-6
<PAGE>   51
 
                         RATIONAL SOFTWARE CORPORATION
 
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
                                 MARCH 31, 1996
          (INFORMATION AT JUNE 30, 1996 AND FOR THE THREE MONTHS ENDED
                      JUNE 30, 1996 AND 1995 IS UNAUDITED)
 
1. ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES
 
     Organization and basis of presentation.  Rational Software Corporation (the
Company) was incorporated under the laws of Delaware on July 28, 1982. The
Company develops, markets and supports a comprehensive solution for the
component-based development of software systems. The Company changed its name
from Verdix Corporation on March 31, 1994.
 
     In October 1995, the Company acquired Objectory AB of Stockholm, Sweden, a
provider of business and systems-engineering solutions based on object
technology. The transaction was recorded using the purchase method. In March
1994, the Company merged with Rational (old Rational), a provider of software
products, technical consulting, and support services for software developers.
The merger was accounted for as a pooling of interests, and accordingly, the
Company's consolidated financial statements have been restated, for all periods
prior to the merger, to include the results of operations, financial position,
and cash flows from old Rational.
 
     The accompanying consolidated financial statements include the accounts of
the Company and its wholly-owned subsidiaries. All intercompany transactions and
balances have been eliminated.
 
     Interim financial information.  The consolidated financial statements for
the three months ended June 30, 1995 and 1996 are unaudited but include all
adjustments (consisting of normal recurring entries) which the Company considers
necessary for fair presentation. Operating results for the three months ended
June 30, 1996 are not necessarily indicative of the results that may be expected
for any future periods.
 
     Use of estimates.  The preparation of the 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 from those
estimates.
 
     Revenue recognition.  The Company recognizes revenue and related costs from
the sale of its software products and systems upon shipment. Revenue from
software royalties, whether they are advance payments that are nonrefundable or
minimum royalty guarantees payable over a fixed period, is recorded when the
earnings process is complete and collection is considered probable. Revenue from
consulting services is recognized when earned. Customer support revenue is
deferred and recognized on a straight-line basis over the period covered by the
customer-support agreement. Contract revenue, which generally is special or
custom engineering development under milestone payments, is recognized in
conformity with Accounting Research Bulletin No. 45, "Long-Term Construction
Type Contracts," using the relevant guidance in SOP 81-1, "Accounting for
Performance of Construction-Type and Certain Production-Type Contracts."
 
     Software capitalization.  Computer software development costs are
capitalized after the economic and technological feasibility of a new product is
established. Capitalized costs are amortized on a product basis over the
estimated economic life of a general-release product, which generally does not
exceed three years. The annual amortization is the greater of the amount
computed using the straight-line method or the amount computed using the ratio
of current revenue to the total of current and anticipated future revenues.
Capitalized software-development costs are also written down periodically to net
realizable value based on an analysis of anticipated future revenues. Research
and
 
                                       F-7
<PAGE>   52
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
development costs prior to the establishment of the economic and technological
feasibility of a product are expensed as incurred.
 
     Capitalized software development costs are included in other assets in the
consolidated balance sheets. The unamortized balance of capitalized software
development costs as of March 31, 1996 and 1995, is $0 and $329,000,
respectively. For the years ended March 31, 1996, 1995, and 1994, software
amortization was $329,000, $472,000, and $5,287,000, respectively. The 1994
amortization included $1,879,000 of previously capitalized software costs
related to duplicate product lines as a result of the merger.
 
     Translation of foreign currencies.  Accounts denominated in foreign
currencies have been translated in accordance with Statement of Financial
Accounting Standards No. 52. The functional currency for the Company's
international sales operations is the U.S. dollar, with the exception of the
Swedish subsidiary whose functional currency is the local currency. Gains and
losses resulting from the remeasurement of the sales operations' foreign
currency financial statements into U.S. dollars are included in other income.
Gains and losses resulting from foreign currency translation of the Swedish
subsidiary are accumulated as a separate component of stockholders' equity.
 
     Other income.  During the year ended March 31, 1996, other income consisted
primarily of interest earned on the Company's excess cash balances and
marketable securities and interest expense. It also included gains and losses on
foreign currency transactions. During the years ended March 31, 1995 and 1994,
other income consisted primarily of gains and losses on foreign currency
transactions, net of interest income.
 
     Net income (loss) per share.  Net loss per share is computed using the
weighted average number of common shares outstanding during the period. Net
income per share is computed using the weighted average number of common and
dilutive common equivalent shares outstanding during the period. Common stock
equivalents consist of stock options using the treasury stock method.
 
     Cash, cash equivalents and short-term investments.  Cash equivalents are
highly liquid investments with original maturity dates of three months or less
at the date of acquisition. Investments with maturity dates between three and
twelve months are considered to be short-term investments.
 
     All of the Company's cash equivalents and short term investments are
classified as available-for-sale under the provisions of Statement of Financial
Accounting Standards No. 115 (FAS 115), "Accounting for Certain Investments in
Debt and Equity Securities." Amortized cost approximates estimated fair value
based on quoted market prices at March 31, 1995 and 1996, and June 30, 1996.
 
     Under FAS 115, management classifies investments as trading,
available-for-sale, or held-to-maturity at the time of purchase and periodically
reevaluates such designation. Debt securities are classified as held-to-maturity
when the Company has the positive intent and ability to hold the securities to
maturity. Held-to-maturity securities are stated at amortized cost with
corresponding premiums or discounts amortized over the life of the investment to
interest income. Debt securities not classified as held-to-maturity are
classified as available-for-sale and reported at fair market value. Unrecognized
gains or losses on available-for-sale securities are included in equity, net of
tax, until their disposition. Realized gains and losses and declines in value
judged to be other than temporary on available-for-sale securities are included
in interest income. The cost of securities sold is based on the specific
identification method.
 
                                       F-8
<PAGE>   53
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Available-for-sale securities and cash consist of the following (in
thousands):
 
<TABLE>
<CAPTION>
                                                                  MARCH 31,
                                                               ----------------    JUNE 30,
                                                                1995     1996        1996
                                                               ------   -------   -----------
                                                                                  (UNAUDITED)
    <S>                                                        <C>      <C>       <C>
    Cash and cash equivalents:
      Money market funds.....................................  $5,019   $35,470     $39,014
      Cash...................................................   4,421     4,994       2,434
      Commercial paper.......................................    --       3,470      --
                                                               ------   -------     -------
         Total...............................................  $9,440   $43,934     $41,448
                                                               ======   =======     =======
    Short-term investments:
      U.S. government........................................  $ --     $ 4,745       4,745
      Commercial paper.......................................    --       3,908       6,671
      Municipal obligations..................................     980     --         --
      Certificates of deposit................................      56        58          58
                                                               ------   -------     -------
         Total...............................................  $1,036   $ 8,711     $11,474
                                                               ======   =======     =======
</TABLE>
 
     Realized gains or losses on sales of available-for-sale securities were
immaterial for the years ended March 31, 1995 and 1996. There were no unrealized
holding gains or losses on such securities at March 31, 1995 and 1996, and June
30, 1996.
 
     Statements of cash flows.  The Company paid, net of amounts capitalized,
interest of $172,000, $97,000, $103,000, $13,000 and $4,000 during fiscal years
1994, 1995 and 1996, and the three months ended June 30, 1995 and 1996,
respectively. The Company paid income taxes of $1,152,000, $199,000, $355,000,
$11,000 and $26,000 during fiscal years 1994, 1995 and 1996, and the three
months ended June 30, 1995 and 1996, respectively. The Company also had capital
lease additions of $715,000, and $119,000 during fiscal years 1994 and 1995,
respectively. In addition, the Company received income tax refunds of $523,000
and $123,000 in fiscal year 1995 and 1996, respectively. In fiscal 1996, the
Company issued $8,770,000 of Common Stock for the purchase of Objectory AB.
 
     Fair value of financial instruments.  The carrying amounts reported in the
balance sheet for cash and cash equivalents and short-term investments
approximate fair value. The fair value of short-term investments is based on
quoted market prices.
 
     The carrying amount of the Company's long-term debt approximates fair
value. The fair value of the Company's long-term debt is estimated using
discounted cash-flow analyses, based on the Company's current incremental
borrowing rate for similar types of borrowing arrangements.
 
     Concentrations of credit risk.  Financial instruments that potentially
subject the Company to concentrations of credit risk consist primarily of cash
equivalents and accounts receivable. The Company's investment policy limits its
exposure to concentrations of credit risk for cash equivalents. The Company
sells its products primarily to major corporations, including systems
integrators, that serve a wide variety of U.S. and foreign markets. Collateral
or deposits generally are not required from customers who demonstrate a positive
credit record and sound financial condition. The concentrations of credit risk
are considered limited for trade receivables.
 
     Property and equipment.  The Company's property and equipment are recorded
at cost, which is generally depreciated over a three- to five-year period using
the straight-line method. The cost of furniture and equipment under capital
leases is recorded at the lower of the present value of the minimum lease
payments or the fair value of the asset and is amortized over the shorter of the
term of
 
                                       F-9
<PAGE>   54
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
the related lease or the estimated useful life of the asset. Leasehold
improvements are depreciated over the remaining life of the lease.
 
     Advertising costs.  The Company expenses advertising costs as incurred.
Advertising costs totaled $889,000, $1,372,000 and $1,012,000 for the years
ended March 31, 1994, 1995 and 1996, respectively.
 
     Reclassifications.  Certain prior year amounts have been reclassified to
conform with current year presentation.
 
     Recent pronouncements.  In October 1995, the Financial Accounting Standards
Board issued Statement of Financial Accounting Standards No. 123 (FAS 123),
"Accounting for Stock-Based Compensation," which established a fair-value-based
method of accounting for stock-based compensation plans and requires additional
disclosures for those companies who elect not to adopt the new method of
accounting. The Company will be required to adopt FAS 123 in fiscal 1997. The
Company's intention is to continue to account for employee stock awards in
accordance with APB Opinion No. 25 and to adopt the disclosure only alternative
described in FAS 123.
 
     In March 1995, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 121 (FAS 121), "Accounting for the Impairment
of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of," which
requires the Company to review for impairment of long-lived assets certain
identifiable intangibles and goodwill related to those assets whenever events or
changes in circumstances indicate that the carrying amount of an asset might not
be recoverable. In certain situations, an impairment loss would be recognized.
FAS 121 will become effective for the Company's year ending March 31, 1997. The
Company has studied the implications of FAS 121 and, based on its initial
evaluation, does not expect its adoption to have a material impact on the
Company's financial condition or results of operations.
 
     Common Stock.  On August 27, 1996, the Company's Board of Directors
approved a two-for-one stock split payable in the form of a stock dividend to
stockholders of record as of September 10, 1996. All shares and per share
information have been adjusted to reflect this change.
 
2. RISKS DUE TO CONCENTRATIONS.
 
     International sales.  International sales currently account for
approximately one-third of the Company's revenues, and the Company expects that
international sales will continue to account for a significant portion of the
Company's revenues in future periods. Any material adverse effect on the
Company's international business would have a material adverse effect on the
Company's financial statements. Also, the Company's international sales are
generally denominated in foreign currencies. Losses on the conversion of
foreign-denominated receivables into U.S. dollars may have a material adverse
effect on the Company's financial statements.
 
3. MERGERS AND ACQUISITIONS.
 
     Objectory.  In October 1995, the Company signed a definitive agreement to
purchase all the outstanding stock of Objectory AB, a Swedish software
development company, in exchange for 1,496,718 shares of common stock. The
acquisition was accounted for using the purchase method, and, accordingly, the
operating results of Objectory AB are included in the consolidated results of
the Company from the date of acquisition. The consolidated balance sheets
include the assets and liabilities of Objectory AB at March 31, 1996.
 
                                      F-10
<PAGE>   55
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The total purchase price was allocated as follows (in thousands):
 
<TABLE>
    <S>                                                                          <C>
    Property and equipment.....................................................  $   188
    Intangible assets..........................................................    1,216
    Severance and facility closure accruals....................................     (312)
    Net liabilities assumed....................................................   (1,022)
    In-process research and development........................................    8,700
                                                                                 -------
                                                                                 $ 8,770
                                                                                 =======
</TABLE>
 
     Intangible assets include assembled workforce and customer base. The
estimated average useful life of these assets is three years. Accumulated
amortization of intangible assets totaled $281,000 at March 31, 1996. In-process
research and development represents the present value of the estimated cash flow
expected to be generated by the Objectory AB related technology, which at the
acquisition date had not yet reached the point of technological feasibility and
does not have an alternative future use. Therefore, in accordance with generally
accepted accounting principles, the in-process research and development was
written off and charged to operations during the quarter ended December 31,
1995.
 
     The following pro forma combined results of operations for the year ended
March 31, 1996 are presented as if the acquisition had occurred at the beginning
of the period. The charges associated with in-process research and development
have not been reflected in the following pro forma summary as they are
nonrecurring.
 
<TABLE>
<CAPTION>
                                                                            MARCH 31,
                                                                       -------------------
                                                                        1995        1996
                                                                       -------     -------
                                                                         (UNAUDITED, IN
                                                                        THOUSANDS, EXCEPT
                                                                         PER SHARE DATA)
    <S>                                                                <C>         <C>
    Net revenue......................................................  $80,112     $95,763
    Net income.......................................................  $ 3,011     $ 3,401
    Net income per share.............................................  $   .12     $   .10
</TABLE>
 
     The pro forma results of operations are not necessarily indicative of the
actual results of operations that would have been obtained had the acquisition
occurred at the beginning of the years presented, nor are they intended to be a
projection of future results.
 
     Old Rational.  On March 31, 1994, the Company merged with old Rational and
acquired all of the common stock of old Rational in exchange for 14,349,572
shares of the Company's common stock. Old Rational developed, marketed and
provided software products, technical consulting, and support services for
software developers. The merger was accounted for as a pooling-of-interests,
and, accordingly, the Company's Consolidated Financial Statements and Notes to
Consolidated Financial Statements have been restated to include the results of
old Rational for all periods presented.
 
     Separate results of operations for the periods prior to the merger are as
follows:
 
<TABLE>
<CAPTION>
                                                                      MERGER-RELATED
                                     THE COMPANY     OLD RATIONAL        EXPENSES        COMBINED
                                     -----------     ------------     --------------     --------
                                                            (IN THOUSANDS)
    <S>                              <C>             <C>              <C>                <C>
    Year ended March 31, 1994
    (Old Rational as of December
      25, 1993)
    Net revenue....................    $20,963         $ 49,380          $     --        $70,343
    Net income (loss)..............    $(4,780)        $    720          $ (9,922)       $(13,982)
</TABLE>
 
                                      F-11
<PAGE>   56
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     The Consolidated Financial Statements for all prior periods include results
of the Company's operations and balance sheets data on a March 31 fiscal year
basis and old Rational's results on a December 25, 1993 basis. Old Rational's
separate results for fiscal 1993 have not been restated to conform to the twelve
months ended March 31, 1994. Old Rational's separate results of operations for
the three months ended March 31, 1994, are not reflected in the Consolidated
Statements of Operations. Unaudited revenue and net loss of old Rational for the
three months ended March 31, 1994 were $7,799,000 and ($5,713,000),
respectively.
 
4. DISCONTINUED OPERATIONS.
 
     On March 26, 1993, the Board of Directors approved the disposition of the
operations of the secure-products business. This business was sold in January
1994 for $778,000 cash and a note for $215,000, which has been paid in full. The
total loss from the disposal of the secure-products business was $662,000, of
which $175,000 was recognized in fiscal 1994, with the balance accrued for in
prior years. There were no revenues from discontinued operations during fiscal
1994.
 
5. RESTRUCTURING OF OPERATIONS.
 
     As part of the business combination with old Rational the Company incurred
substantial merger and restructuring costs. Included in the accompanying
Consolidated Statement of Operations for the year ended March 31, 1994, are
merger-related expenses totaling $9,922,000 consisting primarily of charges of
$3,321,000 incurred as a result of the closing of duplicate facilities,
severance costs of $2,589,000, merger-related administrative costs of
$2,254,000, and write-downs of $1,758,000 of capitalized software costs and
other costs related to duplicate product lines. During the year ended March 31,
1995, the Company reversed $1,100,000 of the duplicate facilities charge as a
result of greater-than-anticipated recoveries through subleasing. The accrual at
March 31, 1996 represents remaining facilities lease obligations, net of
anticipated sublease proceeds.
 
6. LONG-TERM DEBT AND CAPITAL OBLIGATIONS.
 
     In November 1989, the Company entered into a product development and loan
agreement with International Business Machines Corporation (IBM) whereby the
Company received interest-free loans of $8,700,000 to develop certain
proprietary software products in which the Company retains full ownership
rights. In exchange, the Company granted IBM distribution and marketing rights
to the products under development, the right to evaluate all of the Company's
technology for a period of five years, and an agreement to refrain from
undertaking any other development that would impair its ability to perform under
the agreement. The Company also provides consulting to IBM in certain technology
areas. The Company has repaid a total of $8,212,000 through March 31, 1996.
 
     The Company leases certain equipment and furniture under capitalized lease
obligations. The related obligations under capital leases represent the present
value of future minimum lease payments. Assets capitalized under leases totaled
$3,942,000 at March 31, 1995 and 1996. Accumulated amortiza-
 
                                      F-12
<PAGE>   57
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
tion of these leased assets was $3,433,000 and $3,848,000 at March 31, 1995 and
1996, respectively. Long-term debt and capitalized lease obligations consist of
the following at March 31:
 
<TABLE>
<CAPTION>
                                                                         1995       1996
                                                                        -------     -----
                                                                         (IN THOUSANDS)
    <S>                                                                 <C>         <C>
    Long-term debt to IBM.............................................  $ 2,438     $ 488
    Present value of capitalized lease obligation to related
      parties.........................................................       81      --
    Lease obligation to others........................................      572       166
    Note payable to former shareholders...............................      132      --
                                                                        -------     -----
                                                                          3,223       654
    Less current portion of capitalized lease obligations and debt....   (2,572)     (654)
                                                                        -------     -----
    Due after one year................................................  $   651     $--
                                                                        =======     =====
</TABLE>
 
     The overall weighted average of the interest rates on capital leases
approximated 8.2% at March 31, 1996. Future minimum payments at March 31, 1996
are as follows:
 
<TABLE>
<CAPTION>
                                                                     LONG-TERM      LEASE
                                                                       DEBT      OBLIGATIONS
                                                                     ---------   -----------
                                                                         (IN THOUSANDS)
    <S>                                                              <C>         <C>
    1997...........................................................    $ 488        $ 172
                                                                        ----         ----
    Total minimum payments.........................................      488          172
    Amount representing interest...................................    --              (4)
                                                                        ----         ----
                                                                       $ 488        $ 168
                                                                        ====         ====
</TABLE>
 
7. COMMITMENTS AND CONTINGENCIES.
 
     Commitments.  The Company leases its office space at all locations under
operating leases. Rental expense for facilities was approximately $3,129,000,
$1,970,000, $2,520,000, $553,000 and $674,000 in the years ended March 31, 1994,
1995, 1996, and for the three months ended June 30, 1995 and 1996, respectively.
Future minimum rental payments, net of sublease income, at March 31, 1996 are as
follows (in thousands):
 
<TABLE>
        <S>                                                                  <C>
        1997...............................................................  $ 3,225
        1998...............................................................    3,148
        1999...............................................................    3,036
        2000...............................................................    2,386
        2001...............................................................    1,466
                                                                             -------
                                                                             $13,261
                                                                             =======
</TABLE>
 
     As a result of the merger with old Rational on March 31, 1994, the Company
relocated its corporate headquarters into the facility occupied by old
Rational's corporate headquarters. At March 31, 1996, the Company has accrued
$2,611,000 of estimated costs of future rent associated with the excess office
space in both the Herndon and Santa Clara facilities as part of the
merger-related expenses. Total future rents from sublease agreements are
$919,000, $484,000, $345,000 and $115,000 in fiscal 1997, 1998, 1999 and 2000,
respectively.
 
     Legal actions.  On December 1, 1995, a complaint was filed against the
Company relating to the Company's preliminary acquisition negotiations with the
plaintiff, which were subsequently terminated. The plaintiff is seeking money
damages and specific performance of an alleged promise by the Company to acquire
the plaintiff. The Company has denied each and every remaining allegation in the
complaint and intends to defend the case vigorously. Discovery has begun. The
trial date has been set
 
                                      F-13
<PAGE>   58
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
for January 1997. The Company believes the resolution of these matters will not
have an adverse impact on its financial condition and results of operations.
 
8. INCOME TAXES.
 
     Pretax income (loss) from continuing operations is as follows at March 31:
 
<TABLE>
<CAPTION>
                                                              1994        1995       1996
                                                            --------     ------     -------
                                                                    (IN THOUSANDS)
    <S>                                                     <C>          <C>        <C>
    Domestic..............................................  $(13,881)    $4,826     $(4,433)
    Foreign...............................................       478        258       1,440
                                                            --------     ------     -------
              Total.......................................  $(13,403)    $5,084     $(2,993)
                                                            ========     ======     =======
</TABLE>
 
     The Company received approximately $220,000, $200,000 and $1,600,000 of
revenue from foreign sources in 1996, 1995 and 1994, respectively, that was
subject to foreign royalty withholding tax.
 
     The provision for income taxes consists of the following at March 31:
 
<TABLE>
<CAPTION>
                                                                 1994      1995      1996
                                                                 -----     ----     ------
                                                                      (IN THOUSANDS)
    <S>                                                          <C>       <C>      <C>
    Current
      Federal..................................................  $(276)    $100     $   28
      State....................................................    (84)      70         52
      Foreign..................................................    286      236        948
                                                                           -----
                                                                             --
                                                                 -------            -------
                                                                   (74)     406      1,028
    Deferred
      Federal..................................................    478      --        --
      State....................................................   --        --        --
                                                                           -----
                                                                             --
                                                                 -------            -------
                                                                   478      --        --
                                                                           -----
                                                                             --
                                                                 -------            -------
         Total.................................................  $ 404     $406     $1,028
                                                                 =======   =======  =======
</TABLE>
 
     The provision for income taxes differs from the amount of income tax
determined by applying the applicable U.S. statutory federal income tax rate as
a result of the following differences at March 31:
 
<TABLE>
<CAPTION>
                                                             1994        1995        1996
                                                            -------     -------     -------
                                                                    (IN THOUSANDS)
    <S>                                                     <C>         <C>         <C>
    Income tax (benefit) at the federal statutory rate....  $(4,691)    $ 1,780     $(1,048)
    Net operating loss carryforwards not utilized
      (utilized)..........................................    4,253      (1,568)     (1,465)
    Nondeductible charges for acquired in-process research
      and development.....................................    --          --          3,045
    State income taxes (benefit)..........................      (55)         46          52
    Foreign taxes.........................................      152         148         444
    Merger related costs..................................      745       --          --
                                                            -------     -------     -------
         Total............................................  $   404     $   406     $ 1,028
                                                            =======     =======     =======
</TABLE>
 
                                      F-14
<PAGE>   59
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
     Significant components of the Company's deferred tax assets are as follows
at March 31:
 
<TABLE>
<CAPTION>
                                                                       1995         1996
                                                                     --------     --------
                                                                        (IN THOUSANDS)
    <S>                                                              <C>          <C>
    Deferred tax assets
      Net operating loss carryforwards.............................  $ 13,045     $ 16,700
      Tax credit carryforwards.....................................     2,778        3,131
      Inventory valuation accounts.................................     1,108        --
      Lease reserve................................................     1,340        1,379
      Compensation accruals........................................       974        1,120
      Depreciation.................................................     1,201        1,323
      Other........................................................     1,274        1,303
                                                                     --------     --------
      Total deferred tax assets....................................    21,720       24,956
      Valuation allowance for deferred tax assets..................   (21,595)     (24,956)
                                                                     --------     --------
    Deferred tax assets............................................       125        --
    Deferred tax liabilities.......................................
      Computer software............................................       125        --
                                                                     --------     --------
      Total deferred tax liabilities...............................       125        --
                                                                     --------     --------
    Net deferred tax assets........................................  $  --        $  --
                                                                     ========     ========
</TABLE>
 
     The valuation allowance increased by $3,361,000 and $7,031,000 in 1996 and
1994, respectively, and decreased by $1,685,000 in 1995. Approximately
$4,200,000 of the valuation allowance is attributable to stock options, the
benefit of which will be credited to additional paid-in capital when realized.
 
     At March 31, 1996, the Company had net operating loss carryforwards for
federal income tax purposes of approximately $47,400,000 that expire in 1997
through 2011. In addition, the Company had approximately $3,100,000 of tax
credit carryforwards expiring in 1997 through 2010. As a result of the sale of
common stock in June 1995, the Company incurred a change in stock ownership as
defined under Section 382 of the Internal Revenue Code of 1986. Accordingly,
approximately $34,000,000 of the Company's net operating loss carryforwards and
all of the tax credit carryforwards will be subject to an annual limitation
regarding their utilization against taxable income in future years. Such losses
and credits will be available to offset the income tax liability attributable to
annual taxable income of approximately $8,700,000. In addition, as a result of
the merger with old Rational and provisions in the Internal Revenue Code,
utilization of approximately $4,600,000 of net operating loss carryforwards are
further limited to the future income of the Company.
 
9. STOCKHOLDERS' EQUITY.
 
     Common stock.  On May 22, 1995 the Company's Board of Directors and
stockholders approved a one-for-three reverse stock split. All share and per
share information have been adjusted to reflect this change. Approval was also
given to increase the number of post-reverse-split shares of authorized common
stock from 20,000,000 to 25,000,000 shares.
 
     During June 1995, the Company sold 5,758,000 shares of common stock in a
public offering. Net proceeds from the sale were $29,945,000 after deducting
underwriting discounts, commissions, and other related expenses.
 
     Stock options.  The Company provides equity incentives to employees and
directors by means of incentive stock options and nonstatutory options under its
two 1983 Incentive Stock Option Plans, 1986 Stock Option Plan, Non-Employee
Director Stock Option Plan, 1993 Stock Option Plan, and 1994 Stock Option Plan.
Stock options generally vest over a period of four years. Under these plans, the
Company
 
                                      F-15
<PAGE>   60
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
may grant either nonstatutory or incentive stock options and the option price
per share cannot be less than 85% of fair market value in the case of
nonstatutory stock options, or 100% of fair market value in the case of
incentive stock options, determined on the date the option is granted. Under
these plans, the Company has reserved 5,186,950 shares for issuance at March 31,
1996. Options expire at various dates ranging from 5 to 10 years from the date
of grant.
 
     On July 25, 1995, an amendment was approved during the annual meeting by
the Company's stockholders that established a new formula for determining the
size of director grants and that lengthened the vesting period of director
grants. The compensation expense recognized during fiscal 1996 as a result of
this change was $229,000.
 
     At June 30, 1996, options for 1,485,289 shares of common stock were
exercisable at an aggregate exercise price of $4,455,363. Activity under all
plans is summarized as follows:
 
<TABLE>
<CAPTION>
                                                                      SHARES UNDER OUTSTANDING
                                                                              OPTIONS
                                              SHARES AVAILABLE     ------------------------------
                                                 FOR GRANT          OPTIONS       PRICE PER SHARE
                                              ----------------     ----------     ---------------
    <S>                                       <C>                  <C>            <C>
    Balance at March 31, 1993...............      1,466,792         2,429,398      $2.07 - $ 6.66
    Additional shares authorized............      3,333,332            --               --
    Expiration of plan......................       (869,398)           --               --
      Granted...............................     (1,419,942)        1,419,942       3.95 -   5.34
      Exercised.............................       --                (138,970)      2.07 -   4.46
      Canceled..............................        632,276          (632,276)      2.07 -   6.66
    Net transactions of old Rational during
      the period from December 26, 1993 to
      March 31, 1994 (see Note 3)...........       (325,454)         (189,398)      2.82 -   3.29
                                                 ----------        ----------        ------------
    Balance at March 31, 1994...............      2,817,606         2,888,696       2.07 -   6.57
      Granted...............................     (2,416,126)        2,416,126       2.45 -   5.25
      Exercised.............................       --                (220,170)      2.16 -   4.46
      Canceled..............................        333,492          (333,492)      2.25 -   6.47
      Expired...............................       (448,620)           --               --
                                                 ----------        ----------        ------------
    Balance at March 31, 1995...............        286,352         4,751,160       2.07 -   6.57
    Additional shares authorized............      1,333,332            --               --
      Granted...............................     (1,245,568)        1,245,568       2.54 -  18.47
      Exercised.............................       --              (1,167,034)      2.07 -   6.57
      Canceled..............................        156,122          (156,122)      2.54 -  11.19
      Expired...............................        (16,860)           --               --
                                                 ----------        ----------        ------------
    Balance at March 31, 1996...............        513,358         4,673,572       2.07 -  18.47
      Granted (unaudited)...................        (93,780)           93,780      19.75 -  31.06
      Exercised (unaudited).................       --                (449,374)      2.07 -   6.47
      Canceled (unaudited)..................         25,143           (25,143)      2.54 -  18.47
      Expired (unaudited)...................         (6,059)          (29,161)          --
                                                 ----------        ----------        ------------
    Balance at June 30, 1996 (unaudited)....        438,682         4,263,674       2.07 -  31.06
                                                 ==========        ==========        ============
</TABLE>
 
     Employee stock purchase plan.  The Company has an employee stock purchase
plan under which substantially all employees may purchase common stock through
payroll deductions at a price equal to 85% of the lower of the fair market
values as of the beginning or end of the offering period. Stock purchases under
the plan are limited to the lesser of 10% of an employee's compensation, $25,000
per year. At June 30, 1996, 519,000 shares had been issued under the Plan and
shares totaling 181,000 were reserved for issuance.
 
                                      F-16
<PAGE>   61
 
                         RATIONAL SOFTWARE CORPORATION
 
           NOTES TO CONSOLIDATED FINANCIAL STATEMENTS -- (CONTINUED)
 
10. MAJOR CUSTOMERS, RELATED PARTIES, AND INTERNATIONAL SALES.
 
     IBM divested its shares of the Company's outstanding stock during the
secondary offering in the first quarter of fiscal 1996. IBM owned approximately
13% of the Company's outstanding stock at the end of 1994 and 1995 and accounted
for 11% and 3% of the Company's revenue in 1994 and 1995, respectively. Sales to
Lockheed Martin Corporation, which had a representative on the Board through
September 1995, accounted for 1%, 2%, and 4% of the Company's revenue in 1994,
1995, and 1996, respectively.
 
     Two customers accounted for 12% and 16% of the Company's revenue in the
three months ended June 30, 1996.
 
     The Company also derives revenue from the sale of its products to customers
in international geographic areas, including Western Europe, the Asia/Pacific
region, and Canada. Total revenue from international sales and related
consulting and customer support was $21,493,000, $24,839,000, $33,242,000,
$6,827,000 and $7,839,000 for the years ended March 31, 1994, 1995 and 1996 and
for the three months ended June 30, 1995 and 1996, respectively.
 
     Sales into Western Europe accounted for $10,141,000, $12,153,000,
$23,396,000, $4,316,000 and $5,675,000 of total international revenue for the
years ended March 31, 1994, 1995, 1996 and for the three months ended June 30,
1995 and 1996, respectively, with sales into Canada accounting for an additional
$7,282,000, $7,012,000, $4,674,000, $1,010,000 and $200,000 for the years ended
March 31, 1994, 1995, 1996 and the three months ended June 30, 1995 and 1996,
respectively.
 
11. EVENTS SUBSEQUENT TO REPORT OF INDEPENDENT AUDITORS.
 
     On August 27, 1996, the Company's Board of Directors approved a two-for-one
stock split payable in the form of a stock dividend to stockholders of record as
of September 10, 1996. All shares and per share information have been adjusted
to reflect this change. On August 27, 1996 the Stockholders approved an increase
in the authorized number of shares of common stock from 25,000,000 to
75,000,000.
 
     In October 1996, the Board of Directors authorized management of the
Company to file a registration statement with the Securities and Exchange
Commission for the registration of up to 5,872,725 shares of its common stock.
 
                                      F-17
<PAGE>   62
 
                      [THIS PAGE INTENTIONALLY LEFT BLANK]
<PAGE>   63
 
- ------------------------------------------------------
- ------------------------------------------------------
 
     NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR THE UNDERWRITERS.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN
OFFER TO BUY TO ANY PERSON IN ANY JURISDICTION IN WHICH SUCH OFFER OR
SOLICITATION WOULD BE UNLAWFUL OR TO ANY PERSON TO WHOM IT IS UNLAWFUL. NEITHER
THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY
CIRCUMSTANCES, CREATE AN IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY OR THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS OF
ANY TIME SUBSEQUENT TO THE DATE HEREOF.
 
                               ------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
Available Information.................     2
Incorporation of Certain Documents by
  Reference...........................     2
Prospectus Summary....................     3
Risk Factors..........................     6
Use of Proceeds.......................    12
Price Range of Common Stock and
  Dividend Policy.....................    12
Capitalization........................    13
Selected Consolidated Financial
  Data................................    14
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.......................    15
Business..............................    23
Management............................    37
Principal and Selling Stockholders....    40
Description of Capital Stock..........    42
Underwriting..........................    43
Legal Matters.........................    44
Experts...............................    44
Index to Consolidated Financial
  Statements..........................   F-1
</TABLE>
 
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                                5,106,718 SHARES
                                      LOGO
                                  COMMON STOCK
                            -----------------------
 
                                   PROSPECTUS
                            -----------------------
                               HAMBRECHT & QUIST
 
                              GOLDMAN, SACHS & CO.
 
                          WESSELS, ARNOLD & HENDERSON
                                             , 1996
 
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