INTEGRATED SYSTEMS INC
424B3, 1999-12-07
PREPACKAGED SOFTWARE
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<PAGE>
                                                      Filed under Rule 424(b)(3)
                                                      Registration No. 333-89289

                                1,430,037 SHARES

                            INTEGRATED SYSTEMS, INC.

                                  COMMON STOCK

                             ---------------------

    All of the 1,430,037 shares of common stock of Integrated Systems, Inc. are
being sold by shareholders of ISI. ISI will not receive any proceeds from the
sale of shares offered by the selling shareholders. See "Selling Shareholders"
and "Plan of Distribution."

    The common stock is listed on the Nasdaq National Market under the symbol
"INTS." The shares of common stock offered will be sold as described under "Plan
of Distribution."

    On December 3, 1999, the closing price per share of the common stock on the
Nasdaq National Market was $29.75.

                            ------------------------

THE COMMON STOCK OFFERED INVOLVES A HIGH DEGREE OF RISK. SEE "RISK FACTORS"
BEGINNING ON PAGE 3.

                             ---------------------

NEITHER THE SECURITIES AND EXCHANGE COMMISSION, NOR ANY STATE SECURITIES
COMMISSION, HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF
THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                THE DATE OF THIS PROSPECTUS IS DECEMBER 6, 1999.
<PAGE>
                            INTEGRATED SYSTEMS, INC.

    ISI provides solutions for embedded software development that consist of:

    - real-time operating systems and software components for embedded
      microprocessors;

    - tools for designing, developing and optimizing embedded applications;

    - networking products for device connectivity and management; and

    - engineering design services for accelerated co-sourced product
      development.

    Our products help users accelerate the design, development, debugging,
implementation and maintenance of embedded software. Our products and services
are intended to reduce the expense associated with embedded software and system
development and enable customers to develop systems featuring greater
functionality, enhanced performance, improved reliability and ease-of-use. We
market and support our products and provide services on a worldwide basis to a
variety of users in a broad range of industries, including telecommunications,
data communications, automotive, consumer electronics, office products and
point-of-sale and aerospace. Founded in 1980, ISI is headquartered in Sunnyvale,
California, with a worldwide sales and service presence extending throughout
Asia, Europe and the Americas. Our principal executive offices are located at
201 Moffett Park Drive, Sunnyvale, California 94089. Our telephone number is
(408) 542-1500.

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<PAGE>
                                  RISK FACTORS

    THIS OFFERING IS RISKY. ANYONE WHO MAY RECEIVE COMMON STOCK UNDER THIS
PROSPECTUS SHOULD CAREFULLY CONSIDER THE FOLLOWING RISK FACTORS IN ADDITION TO
THE OTHER INFORMATION PRESENTED IN OR INCORPORATED BY REFERENCE INTO THIS
PROSPECTUS AND ANY PROSPECTUS SUPPLEMENT.

FLUCTUATIONS IN OUR QUARTERLY RESULTS COULD CAUSE THE MARKET PRICE OF OUR COMMON
  STOCK TO DECLINE

    Our quarterly operating results can vary significantly depending on a number
of factors. These factors include:

    - the volume and timing of orders received during the quarter;

    - the mix of and changes in customers to whom our products are sold;

    - the timing and acceptance of new products and product enhancements by us
      or by our competitors;

    - changes in pricing;

    - buyouts of run-time licenses;

    - product life cycles;

    - the level of our sales of third party products;

    - variances in costs associated with fixed price contracts;

    - purchasing patterns of customers;

    - competitive conditions in the industry;

    - foreign currency exchange rate fluctuations;

    - business cycles and economic conditions that affect the markets for our
      products; and

    - extraordinary events, such as litigation or acquisitions, including
      related charges.

    All of these factors are difficult to forecast. Our future operating results
may fluctuate as a result of these and other factors, including our ability to
continue to develop innovative and competitive products. An increasing amount of
our sales orders involve products and services that yield revenue over multiple
quarters or upon completion of performance. If license agreements entered into
during a quarter do not meet our revenue recognition criteria, even if we meet
or exceed our forecast of aggregate licensing and other contracting activity, it
is possible that our revenues would not meet expectations.

    Due to all of these factors, we believe that period-to-period comparisons of
our results of operations are not necessarily meaningful and should not be
viewed as an indication of our future performance. In the past, we have
experienced actual performance that did not meet financial market expectations.
It is likely that, in some future quarters, our operating results will again be
below the expectations of stock market analysts and investors.

OUR INSIGNIFICANT BACKLOG AND LONG SALES CYCLE COMBINED WITH COSTS THAT ARE
  FIXED, MAKE IT DIFFICULT FOR US TO PREDICT FUTURE REVENUE AND COMPENSATE FOR A
  REVENUE SHORTFALL

    Historically, we have operated with insignificant product backlog because we
generally ship our products when we receive the order. As a result, our product
revenue in any quarter depends on the volume and timing of orders received in
that quarter. In addition, we generally recognize a substantial portion of our
total revenue from sales orders received and shipped in the last two weeks of
the quarter. Thus, the magnitude of quarterly fluctuations may not become
evident until very late in, or

                                       3
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after the end of, a particular quarter. In addition, the procurement process of
our customers typically ranges from a few weeks to several months or longer from
initial inquiry to order, making the timing of sales and license fees difficult
to predict. As licensing of our products increasingly becomes a more strategic
decision made at higher management levels, we believe that sales cycles for our
products will lengthen. Because our staffing and operating expenses are based on
anticipated total revenue levels, and a high percentage of our costs are fixed
in the short term and do not vary with revenue, small variations between
anticipated orders and actual orders, as well as non-recurring or large orders,
can cause disproportionate variations in our operating results from quarter to
quarter.

IF OUR NEW PRODUCTS OR PRODUCT ENHANCEMENTS FAIL TO ACHIEVE CUSTOMER ACCEPTANCE,
  OR IF WE FAIL TO MANAGE PRODUCT TRANSITIONS, OUR BUSINESS REPUTATION AND
  FINANCIAL PERFORMANCE WOULD SUFFER

    The market for embedded applications is fragmented and is characterized by
technological change, evolving industry standards and rapid changes in customer
requirements. Our existing products will be rendered less competitive or
obsolete if we fail to introduce new products or product enhancements that
anticipate the features and functionality that customers demand. The success of
our new product introductions will depend on our ability to:

    - accurately anticipate industry trends and changes in technology standards;

    - timely complete and introduce new product designs and features;

    - continue to enhance our existing product lines;

    - offer our products across a spectrum of microprocessor families used in
      the embedded systems market; and

    - respond promptly to customers' requirements and preferences.

    In addition, the introduction of new or enhanced products also requires that
we manage the transition from older products to minimize disruption in customer
ordering patterns.

    Development delays are commonplace in the software industry. We have
experienced delays in the development of new products and the enhancement of
existing products in the past and are likely to experience delays in the future.
We may not be successful in developing and marketing, on a timely basis or at
all, competitive products, product enhancements and new products that respond to
technological change, changes in customer requirements and emerging industry
standards.

COMPETITION CAN LEAD TO PRICING PRESSURES AND LOSS OF MARKET SHARE

    The market for commercially available software tools and embedded operating
systems is fragmented and highly competitive. As the industry continues to
develop, we expect competition to increase in the future from existing
competitors and from other companies that may enter our existing or future
markets with similar or substitute solutions that may be less costly or provide
better performance or functionality than our products. Some of our existing and
many of our potential competitors have substantially greater financial,
technical, marketing and sales resources than we do, and we might not be able to
compete successfully against these companies. If price competition increases
significantly, competitive pressures could cause us to reduce the prices of our
products, which would result in reduced profit margins and could harm our
ability to provide adequate service to our customers. Our pricing model for our
embedded software products is based on a range of mid-priced development license
packages, combined with low-priced per-unit production, or run-time, licenses.
Run-time licenses, which provide for per-unit royalty payments for each embedded
system that incorporates our real-time operating systems, may be subject to
significant pricing pressures, including buy-out arrangements. Also, the market
may demand alternative pricing models in the future. A variety

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of other potential actions by ISI's competitors, including increased promotion
and accelerated introduction of new or enhanced products, could also harm our
competitive position.

IF WE ENGAGE IN FUTURE ACQUISITIONS, WE MAY FAIL TO INTEGRATE ACQUIRED
  BUSINESSES EFFECTIVELY, WHICH COULD DISRUPT OUR ONGOING BUSINESS AND GENERATE
  NEGATIVE PUBLICITY

    We have completed a number of acquisitions in recent years, most recently
the acquisition of Software Development Systems, Inc. in July 1999. We may
complete additional acquisitions in the future. The process of integrating an
acquired company's business into our operations may result in unforeseen
operating difficulties and expenditures. It may also absorb significant
management attention that would otherwise be available for the ongoing
development of our business. Moreover, the anticipated benefits of an
acquisition might not be realized. Future acquisitions could result in
potentially dilutive issuances of equity securities, the incurrence of debt and
contingent liabilities and amortization expenses related to goodwill and other
intangible assets. In addition, acquisitions involve numerous risks, including
difficulties in the assimilation of the operations, technologies and products of
the acquired companies, difficulties in managing diverse geographic sales and
research and development operations, the diversion of management attention from
other business concerns, risks of entering markets in which we have no or
limited direct prior experience and the potential loss of key employees of the
acquired company.

INTERNATIONAL SALES OF OUR PRODUCTS ACCOUNT FOR A SIGNIFICANT PORTION OF OUR
  TOTAL REVENUE, WHICH EXPOSES US TO THE BUSINESS AND ECONOMIC RISKS OF
  INTERNATIONAL OPERATIONS

    Sales from outside of North America accounted for approximately 38% of our
total revenue in fiscal year 1997, 41% of our total revenue in fiscal year 1998
and 42% of our total revenue in fiscal year 1999 and the first six months of
fiscal year 2000. We expect that international sales will continue to generate a
significant percentage of our total revenue in the foreseeable future.
International operations are subject to a number of special risks. These risks
include:

    - foreign government regulation;

    - reduced protection of intellectual property rights in some countries where
      we do business;

    - longer receivable collection periods and greater difficulty in accounts
      receivable collection;

    - unexpected changes in, or imposition of, regulatory requirements, tariffs,
      import and export restrictions and other barriers and restrictions;

    - potentially adverse tax consequences;

    - the burdens of complying with a variety of foreign laws and staffing and
      managing foreign operations;

    - general geopolitical risks, such as political and economic instability,
      hostilities with neighboring countries and changes in diplomatic and trade
      relationships; and

    - possible recessionary environments in economies outside the United States.

    More generally, recent instability in Asian currency and stock market
economies could adversely affect the economic health of the entire region and
could have an adverse effect on our results of operations. For example, in many
countries in the Asia Pacific region, during fiscal years 1998 and 1999 there
was little or no growth in investment in product development infrastructure by
manufacturing companies.

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<PAGE>
CURRENCY FLUCTUATIONS CAN CAUSE OUR REVENUE TO DECLINE

    We generally denominate sales to and by foreign subsidiaries in local
currency. An increase in the relative value of the dollar against local
currencies would reduce our revenue in dollar terms or make our products more
expensive and, therefore, potentially less competitive in foreign markets. For
example, revenue from sales in Japan during fiscal years 1997 and 1998 was
adversely affected by the weakness of the yen against the dollar. Similarly, the
currencies of many other countries in the Asia Pacific region have recently lost
significant value against the dollar, notably the currencies of Korea and
Taiwan. Our future results of operations could be adversely affected by currency
fluctuations.

IF OUR INTERNATIONAL DISTRIBUTORS AND REPRESENTATIVES DO NOT PROMOTE OUR
  PRODUCTS EFFECTIVELY, OUR REVENUES COULD DECLINE

    We rely on distributors and representatives for sales of our products in
some foreign countries and, accordingly, depend on their ability to promote and
support our products and, in some cases, to translate them into foreign
languages. Our international distributors and representatives generally offer
products of several different companies, including in some cases products that
are competitive with our products, and these distributors and representatives
are not subject to any minimum purchase or resale requirements. Our
international distributors and representatives may not continue to purchase our
products or provide them with adequate levels of support.

PRODUCT DEFECTS CAN BE EXPENSIVE TO FIX AND CAN CAUSE US TO LOSE CUSTOMERS

    As a result of their complexity, software products may contain undetected
errors or compatibility issues, particularly when first introduced or as new
versions are released. Despite testing by us and testing and use by current and
potential customers, errors might be found in new products after commencement of
commercial shipments. The occurrence of errors could result in loss of or delay
in market acceptance of our products. The increasing use of our products for
applications in systems that interact directly with the general public,
particularly applications in transportation, medical systems and other markets
where the failure of the embedded system could cause substantial property damage
or personal injury, could expose us to significant product liability claims. In
addition, our products are used for applications in business systems where the
failure of the embedded system could be linked to substantial economic loss. Our
license and other agreements with our customers typically contain provisions
designed to limit our exposure to potential product liability and other claims.
It is likely, however, that the limitation of liability provisions contained in
our agreements are not effective in all circumstances and in all jurisdictions.
We do not have insurance against product liability risks and insurance may not
be available to us on commercially reasonable terms. Our errors and omissions
insurance may not be adequate to cover claims. A product liability claim or
claim for economic loss brought against us, or a product recall involving our
software, could lead to significant unexpected expenses and lost sales.

    Our operations depend on our ability to protect our computer equipment and
the information stored in our databases against damage by fire, natural
disaster, power loss, telecommunications failure, unauthorized intrusion and
other catastrophic events. We believe we have taken prudent measures to reduce
the risk of interruption in our operations. However, these measures might not be
sufficient.

IF WE LOSE KEY PERSONNEL OR ARE UNABLE TO HIRE ADDITIONAL QUALIFIED PERSONNEL AS
  NECESSARY, WE MAY NOT BE ABLE TO SUCCESSFULLY MANAGE OUR BUSINESS OR SELL OUR
  PRODUCTS

    Our future performance depends to a significant degree upon the continued
contributions of our key management, product development, sales, marketing and
operations personnel. We do not have agreements with any of our key personnel
that require them to work for us for a specific term, and we do not maintain any
key person life insurance policies. In addition, we believe our future success
will

                                       6
<PAGE>
also depend in large part upon our ability to attract and retain highly skilled
managerial, engineering, sales, marketing and operations personnel, many of whom
are in great demand. Competition for qualified personnel is intense in Santa
Clara County, California, where we are headquartered, and we may not be able to
attract and retain personnel.

OUR INABILITY TO PROTECT OUR INTELLECTUAL PROPERTY RIGHTS FROM THIRD-PARTY
  CHALLENGES MAY SIGNIFICANTLY IMPAIR OUR COMPETITIVE POSITION

    We depend on our proprietary technology. Despite our efforts to protect our
proprietary rights, it may be possible for unauthorized third parties to copy
our products or to reverse engineer or obtain and use information that we regard
as proprietary. Our competitors could independently develop technologies that
are substantially equivalent or superior to our technologies. Policing
unauthorized use of our products is difficult, and while we are unable to
determine the extent to which software piracy of our products exists, software
piracy can be expected to be a persistent problem. In addition, effective
protection of intellectual property rights may be unavailable or limited in
foreign countries. 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. Patents have been granted on
fundamental technologies in software, and patents may issue that relate to
fundamental technologies incorporated into our products.

OUR PRODUCTS MAY INFRINGE ON THE INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES,
  WHICH MAY RESULT IN LAWSUITS AND PREVENT US FROM SELLING OUR PRODUCTS

    As the number of patents, copyrights, trademarks and other intellectual
property rights in our industry increases, products based on our technology may
increasingly become the subject of infringement claims. Third parties could
assert infringement claims against us in the future. Infringement claims with or
without merit could be time consuming, result in costly litigation, cause
product shipment delays or require us to enter into royalty or licensing
agreements. Royalty or licensing agreements, if required, might not be available
on terms acceptable to us. In addition, we may initiate claims or litigation
against third parties for infringement of our proprietary rights or to establish
the validity of our proprietary rights. Litigation to determine the validity of
any claims, whether or not the litigation is resolved in our favor, could result
in significant expense to us and divert the efforts of our technical and
management personnel from productive tasks. In the event of an adverse ruling in
any litigation, we may be required to pay substantial damages, discontinue the
use and sale of infringing products, expend significant resources to develop
non-infringing technology or obtain licenses to infringing technology. The
failure of ISI to develop or license a substitute technology could prevent us
from selling our products.

IF WE LOSE THIRD-PARTY LICENSE RIGHTS, WE MAY NOT BE ABLE TO SELL SOME OF OUR
  PRODUCTS

    We license software development tool products from other companies to
distribute with some of our products. These third parties may not be able to
provide competitive products with adequate features and high quality on a timely
basis or to provide sales and marketing cooperation. In addition, our products
compete with products produced by some of our licensors. When these licenses
terminate or expire, continued license rights might not be available to us on
reasonable terms. In addition, we might not be able to obtain similar products
to substitute into our tool suites.

IF WE OR OUR SIGNIFICANT SUPPLIERS OR SERVICE PROVIDERS FAILS TO BE YEAR 2000
  COMPLIANT, OUR BUSINESS MAY BE DISRUPTED AND OUR REVENUES MAY DECLINE

    We believe that all of our most current product releases will not cease to
perform nor generate incorrect or ambiguous data or results solely due to a
change in date to or after January 1, 2000, and will calculate any information
dependent on such dates in the same manner, and with the same

                                       7
<PAGE>
functionality, data integrity and performance, as these products do on or before
December 31, 1999. However, all of our customers may not implement the Year 2000
compliant release of our products in a timely manner, which could lead to
failure of customer systems and product liability claims against us. Even if our
products are Year 2000 compliant, we may, in the future, be subject to claims
based on Year 2000 issues in the products of other companies or issues arising
from the integration of multiple products within a system. The costs of
defending and resolving Year 2000-related disputes, and any liability for Year
2000-related damages, including consequential damages, could be significant. In
addition, Year 2000 failures could have a negative effect on our competitive
position. If any of our critical suppliers do not successfully and timely
achieve Year 2000 compliance, and we are unable to replace them with new or
alternate suppliers, our business would be disrupted.

WE ARE AT RISK OF SECURITIES CLASS ACTION LITIGATION DUE TO OUR STOCK PRICE
  VOLATILITY

    The prices for our common stock have fluctuated widely in the past. During
the 12 months ended December 3, 1999, the closing price of a share of our common
stock ranged from a high of $29.75 to a low of $8.25. Stock price volatility has
had a substantial effect on the market prices of securities issued by us and
other high technology companies, often for reasons unrelated to the operating
performance of the specific companies. In the past, following periods of
volatility in the market price of a company's securities, securities class
action litigation has often been instituted against the company. We may in the
future be the target of similar litigation. Regardless of the outcome,
securities litigation may result in substantial costs and divert management
attention and resources.

FINANCIAL STATEMENTS ARE BASED ON ESTIMATES AND ASSUMPTIONS

    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the recorded amounts of assets and liabilities at the
date of the financial statements and the recorded amounts of revenues and
expenses during the reporting period. A change in the facts and circumstances
surrounding these estimates could result in a change to the estimates and impact
future operating results.

                 CAUTIONARY NOTE ON FORWARD LOOKING STATEMENTS

    This prospectus (including the documents incorporated by reference) contains
forward-looking statements regarding ISI's plans, expectations, estimates and
beliefs. These statements involve risks and uncertainties, and actual results
could differ materially from those reflected in the forward-looking statements.
Forward-looking statements in this prospectus are typically identified by words
such as "believes," "anticipates," "expects," "intends," "will" and "may" and
other similar expressions. In addition, any statements that refer to
expectations, projections or other characterizations of future events or
circumstances are forward-looking statements. ISI will not necessarily update
the information in this prospectus if and when any forward-looking statement
later turns out to be inaccurate. Some of the important risks and uncertainties
that may affect ISI's future results and performance are described in "Risk
Factors," above. Additional information about factors that could affect ISI's
future results and events is included in ISI's reports filed with the SEC and
incorporated by reference in this prospectus.

                                USE OF PROCEEDS

    ISI will not receive any of the proceeds from the sale of shares by the
selling shareholders.

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<PAGE>
                              SELLING SHAREHOLDERS

    The following table sets forth certain information known to ISI with respect
to the beneficial ownership of the common stock as of September 30, 1999 by the
selling shareholders. The selling shareholders are the former shareholders of
SDS. They have not had any position, office or other material relationship with
ISI within the three years before July 21, 1999, the date on which ISI acquired
SDS. As of July 21, 1999, James E. Challenger, Jr. was appointed a Vice
President of ISI and Anthony Skiba became an employee of ISI. Mr. Challenger is
a member of the ISI Board of Directors and has an employment contract and a
Non-Competition Agreement with ISI.

    The table assumes that the selling shareholders sell all of the shares
offered by them in this offering. However, we are unable to determine the exact
number of shares that will actually be sold or when or if such sales will occur.
This table also assumes that the selling shareholders do not acquire any other
shares of our common stock pending the offering.

    The selling shareholders have advised us that they are the beneficial owners
of the shares being offered.

<TABLE>
<CAPTION>
                                                  SHARES BENEFICIALLY                  SHARES BENEFICIALLY
                                                     OWNED BEFORE                          OWNED AFTER
                                                       OFFERING                        -------------------
                                                  -------------------   SHARES BEING   OFFERING
NAME                                               NUMBER    PERCENT      OFFERED       NUMBER    PERCENT
- ----                                              --------   --------   ------------   --------   --------
<S>                                               <C>        <C>        <C>            <C>        <C>
James E. Challenger, Jr. (1)....................  859,736      3.6         859,736          --          --
Anthony Skiba...................................  429,868      1.8         429,868          --          --
Robert M. Zieserl (2)...........................  140,243        *         140,243          --          --
Jeffrey Barth...................................      190        *             190          --          --
</TABLE>

- ------------------------

*   Less than 1%

(1) 429,869 of these shares are held by Mr. Challenger individually. The
    remainder are held of record by Mr. Challenger as trustee of the James E.
    Challenger, Jr. Trust.

(2) 86,517 of these shares are held individually. The remainder of these shares
    are held of record by Mr. Zieserl as trustee under various family trusts.

    Under an escrow agreement dated July 15, 1999, we hold in escrow a total of
71,488 shares that are beneficially owned by the selling shareholders. The
escrow shares are included in the totals shown above. The escrow is scheduled to
terminate on July 15, 2000 unless we make a claim against the escrow fund. If we
make a claim against the escrow fund, the escrow will terminate when the claim
is finally resolved. We must consent to any sale of escrow shares until the
escrow terminates.

                              PLAN OF DISTRIBUTION

    We are registering the shares on behalf of the selling shareholders. The
selling shareholders are former shareholders of Software Development
Systems, Inc., a company that we acquired on July 21, 1999. The selling
shareholders are bound by a registration rights agreement with us. To our
knowledge, the selling shareholders have not entered into any agreement,
arrangement or understanding with any particular broker or market maker with
respect to the sale of the shares covered by this prospectus.

    The selling shareholders may offer and sell shares of common stock from time
to time. In addition, a selling shareholder's donees, pledgees, transferees and
other successors in interest may sell shares received from a named selling
shareholder after the date of this prospectus. The selling shareholders will act
independently of ISI in making decisions with respect to the timing, manner and
size of each sale. Sales may be made over the Nasdaq National Market or
otherwise, at then prevailing market

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prices, at prices related to prevailing market prices or at negotiated prices.
The shares may be sold by one or more of the following:

    - a block trade in which the broker-dealer engaged by a selling shareholder
      will attempt to sell the shares as agent but may position and resell a
      portion of the block as principal to facilitate the transaction;

    - purchases by the broker-dealer as principal and resale by the broker or
      dealer for its account pursuant to this prospectus; and

    - ordinary brokerage transactions and transactions in which the broker
      solicits purchasers.

    The selling shareholders have advised ISI that they have not, as of the date
of this prospectus, entered into any agreements, understandings or arrangements
with any underwriters or broker-dealers for the sale of shares, nor is there an
underwriter or coordinating broker acting in connection with the proposed sale
of shares by the selling shareholders.

    In connection with distributions of the shares or otherwise, the selling
shareholders may enter into hedging transactions with broker-dealers or other
financial institutions. In connection with these transactions, broker-dealers or
financial institutions may engage in short sales of the shares in the course of
hedging the positions they assume with selling shareholders. The selling
shareholders may also sell shares short and redeliver the shares to close out
these short positions. The selling shareholders may also enter into option or
other transactions with broker-dealers or other financial institutions that
require the delivery to the broker-dealer or financial institution of the
shares, which the broker-dealer or financial institution may resell or otherwise
transfer under this prospectus. The selling shareholders may also loan or pledge
the shares to a broker-dealer or other financial institution and the
broker-dealer or financial institution may sell the shares so loaned or, upon a
default, the broker-dealer may sell the pledged shares under this prospectus. In
addition, any securities covered by this prospectus that qualify for sale under
Rule 144 of the Securities Act may be sold under Rule 144 rather than under this
prospectus.

    Transactions under this prospectus may or may not involve brokers or
dealers. The selling shareholders may sell shares directly to purchasers or to
or through broker-dealers, who may act as agents or principals. Broker-dealers
engaged by the selling shareholders may arrange for other broker-dealers to
participate in selling shares. Broker-dealers or agents may receive compensation
in the form of commissions, discounts or concessions from the selling
shareholders in amounts to be negotiated in connection with the sale.
Broker-dealers or agents may also receive compensation in the form of discounts,
concessions or commissions from the purchasers of shares for whom the
broker-dealers may act as agents or to whom they sell as principal, or both.
This compensation as to a particular broker-dealer might exceed customary
commissions.

    The selling shareholders and any participating broker-dealers may be deemed
to be "underwriters" within the meaning of the Securities Act in connection with
sales of shares covered by this prospectus. Any commission, discount or
concession received by a broker-dealer and any profit on the resale of shares
sold by them while acting as principals might be deemed to be underwriting
discounts or commissions under the Securities Act. Because selling shareholders
may be deemed to be underwriters within the meaning of the Securities Act, the
selling shareholders will be subject to the prospectus delivery requirements of
the Securities Act.

    ISI has informed the selling shareholders that the anti-manipulation rules
under the Exchange Act apply to sales of shares in the market and to the
activities of the selling shareholders and their affiliates. The selling
shareholders have advised ISI that during the time they may be engaged in the
attempt to sell registered shares, they will:

    - not engage in any stabilization activity in connection with any of ISI's
      securities;

                                       10
<PAGE>
    - not bid for or purchase any of ISI's securities or any rights to acquire
      ISI's securities, or attempt to induce any person to purchase any of ISI's
      securities or rights to acquire ISI's securities, other than, in each
      case, as permitted under the Exchange Act;

    - not sell or distribute the shares until after the prospectus has been
      appropriately amended or supplemented, if required, to set forth the terms
      of sale or distribution; and

    - make all sales of shares in broker's transactions through broker-dealers
      acting as agents, in transactions directly with market makers or in
      privately negotiated transactions where no broker or other third party
      (other than the purchaser) is involved.

    ISI has the ability to suspend the use of this prospectus if, in the good
faith judgment of the ISI board of directors, it would be seriously detrimental
to ISI and its shareholders for resales of shares to be made. Each period of
suspension may last up to 60 days, with a maximum of two periods of suspension
in any 12-month period.

    This offering will terminate on the earlier of:

    - July 21, 2001;

    - the date on which all shares held by all selling shareholders can be sold
      in a three-month period under Rule 144; or

    - the date on which all shares offered have been sold by the selling
      shareholders.

    ISI has agreed to pay the expenses of registering the shares under the
Securities Act, including registration and filing fees, printing expenses,
administrative expenses and certain legal and accounting fees. The selling
shareholders will bear all discounts, commissions or other amounts payable to
underwriters, dealers or agents as well as fees and disbursements for legal
counsel retained by any selling shareholder.

    ISI and the selling shareholders have agreed to indemnify each other and
other related parties against specified liabilities, including liabilities
arising under the Securities Act. The selling shareholders may agree to
indemnify any agent, dealer or broker-dealer that participates in transactions
involving sales of shares against liabilities, including liabilities arising
under the Securities Act.

    Upon the occurrence of any of the following events, a supplement to this
prospectus will be filed, if required, under Rule 424(b) under the Securities
Act to include additional disclosure before offers and sales of the securities
in question are made:

    - to the extent the securities are sold at a fixed price or at a price other
      than the prevailing market price, such price would be set forth in the
      prospectus;

    - if the securities are sold in block transactions and the purchaser acting
      in the capacity of an underwriter wishes to resell, such arrangements
      would be described in the prospectus;

    - if the selling shareholders sell to a broker-dealer acting in the capacity
      as an underwriter, such broker-dealer will be identified in the
      prospectus;

    - if the compensation paid to broker-dealers is other than usual and
      customary discounts, concessions or commissions, disclosure of the terms
      of the transaction would be included in the prospectus; and

    - if a selling shareholder notifies ISI that a donee or pledgee intends to
      sell more than 500 shares.

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<PAGE>
                                 LEGAL MATTERS

    The validity of the shares of common stock offered hereby will be passed
upon for ISI by Fenwick & West LLP, Palo Alto, California.

                                    EXPERTS

    The consolidated financial statements incorporated in this prospectus by
reference to our Annual Report on Form 10-K for the year ended February 28,
1999, have been so incorporated in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given upon the authority of
said firm as experts in auditing and accounting.

    The consolidated financial statements incorporated by reference to our
Current Report on Form 8-K dated July 21, 1999, as amended, have been so
incorporated in reliance upon the report of KPMG LLP, independent accountants,
given upon the authority of said firm and experts in auditing and accounting.

             DOCUMENTS INCORPORATED BY REFERENCE IN THIS PROSPECTUS

    The SEC allows ISI to "incorporate by reference" the information that ISI
files with the SEC. This means that ISI can disclose important information by
referring the reader to those SEC filings. The information incorporated by
reference is considered to be part of this prospectus, and later information ISI
files with the SEC will update and supersede this information. ISI incorporates
by reference the documents listed below and any future filings made with the SEC
under Section 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934
until termination of the offering:

    - Annual report on Form 10-K for the fiscal year ended February 28, 1999;

    - Quarterly report on Form 10-Q for the quarter ended May 31, 1999;

    - Quarterly report on Form 10-Q for the quarter ended August 31, 1999;

    - Current report on Form 8-K dated July 21, 1999, as amended;

    - Current report on Form 8-K dated October 21, 1999;

    - The description of ISI's common stock contained in ISI's registration
      statement on Form 8-A, and any amendment or report filed for the purpose
      of updating such description; and

    - The description of ISI's Preferred Stock Purchase Rights contained in
      ISI's registration statement on Form 8-A, and any amendment or report
      filed for the purpose of updating such description.

    SOME OF THE INFORMATION ABOUT ISI THAT MAY BE IMPORTANT TO AN INVESTMENT
DECISION IS NOT PHYSICALLY INCLUDED IN THIS PROSPECTUS. INSTEAD, THE INFORMATION
IS "INCORPORATED" INTO THIS PROSPECTUS BY REFERENCE TO ONE OR MORE DOCUMENTS
THAT ISI FILED WITH THE SEC. THESE DOCUMENTS (INCLUDING ANY EXHIBITS THAT ARE
SPECIFICALLY INCORPORATED BY REFERENCE INTO THE INFORMATION THAT THIS PROSPECTUS
INCORPORATES) ARE AVAILABLE UPON REQUEST WITHOUT CHARGE FROM INVESTOR RELATIONS,
INTEGRATED SYSTEMS, INC., 201 MOFFETT PARK DRIVE, SUNNYVALE, CALIFORNIA 94089
(TELEPHONE NUMBER (408) 542-1500). RECIPIENTS SHOULD MAKE ALL REQUESTS FOR
DOCUMENTS BY THE FIFTH BUSINESS DAY BEFORE THEY MAKE THEIR FINAL INVESTMENT
DECISION, TO BE SURE THE DOCUMENTS ARRIVE ON TIME. INFORMATION THAT HAS BEEN
INCORPORATED BY REFERENCE IS CONSIDERED PART OF THIS PROSPECTUS AND DISCLOSED TO
INVESTORS, WHETHER OR NOT INVESTORS OBTAIN A COPY OF THE DOCUMENT CONTAINING THE
INFORMATION.

    This prospectus may contain information that updates, modifies or is
contrary to information in one or more of the documents incorporated by
reference in this prospectus. Reports ISI files with the SEC after the date of
this prospectus may also contain information that updates, modifies or is

                                       12
<PAGE>
contrary to information in this prospectus or in documents incorporated by
reference in this prospectus. Investors should review these reports as they may
disclose a change in the business, prospects, financial condition or other
affairs of ISI after the date of this prospectus.

                      WHERE YOU CAN FIND MORE INFORMATION

    The documents incorporated by reference into this prospectus are available
from us upon request. We will provide a copy of any and all of the information
that is incorporated by reference in this prospectus, not including exhibits to
the information unless those exhibits are specifically incorporated by reference
into this proxy statement prospectus, to any person, without charge, upon
written or oral request.

    Requests for documents should be directed to Investor Relations, Integrated
Systems, Inc., 201 Moffett Park Drive, Sunnyvale, California 94089 (telephone
number (408) 542-1500).

    We file reports, proxy statements and other information with the Securities
and Exchange Commission. Copies of our reports, proxy statements and other
information may be inspected and copied at the public reference facilities
maintained by the SEC:

<TABLE>
<S>                            <C>                            <C>
Judiciary Plaza                Citicorp Center                Seven World Trade Center
Room 1024                      5000 West Madison Street       13th Floor
450 Fifth Street, N.W.         Suite 1400                     New York, New York 10048
Washington, D.C. 20549         Chicago, Illinois 60661
</TABLE>

    Copies of these materials can also be obtained by mail at prescribed rates
from the Public Reference Section of the SEC, 450 Fifth Street, N.W.,
Washington, D.C. 20549 or by calling the SEC at 1-800-SEC-0330. The SEC
maintains a Website that contains reports, proxy statements and other
information regarding each of us. The address of the SEC Website is
http://www.sec.gov.

    ISI has filed a registration statement under the Securities Act with the
Securities and Exchange Commission with respect to the shares to be sold by the
selling shareholders. This prospectus has been filed as part of the registration
statement. This prospectus does not contain all of the information set forth in
the registration statement because certain parts of the registration statement
are omitted in accordance with the rules and regulations of the SEC. The
registration statement is available for inspection and copying as set forth
above.

    THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF
AN OFFER TO PURCHASE, THE SECURITIES OFFERED BY THIS PROSPECTUS IN ANY
JURISDICTION TO OR FROM ANY PERSON TO WHOM OR FROM WHOM IT IS UNLAWFUL TO MAKE
SUCH OFFER, SOLICITATION OF AN OFFER OR PROXY SOLICITATION IN SUCH JURISDICTION.
NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY DISTRIBUTION OF SECURITIES
PURSUANT TO THIS PROSPECTUS SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY
IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE INFORMATION SET FORTH OR
INCORPORATED HEREIN BY REFERENCE OR IN OUR AFFAIRS SINCE THE DATE OF THIS
PROSPECTUS.

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