ASPEN TECHNOLOGY INC /DE/
424B3, 1999-07-22
COMPUTER PROGRAMMING SERVICES
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                                                Filed Pursuant to Rule 424(b)(3)
                                                Registration No. 333-80223


                                  45,000 SHARES

                             ASPEN TECHNOLOGY, INC.

                                  COMMON STOCK

The selling stockholders are offering 45,000 shares of common stock. We will not
receive any of the proceeds from sales of shares by the selling stockholders.

Our common stock trades on the Nasdaq National Market under the symbol "AZPN."
On July 19, 1999, the last reported sale price of our common stock on the Nasdaq
National Market was $12.75 per share.

The selling stockholders may sell these shares from time to time on the Nasdaq
National Market or otherwise. They may sell the shares at prevailing market
prices or at prices negotiated with buyers. The selling stockholders will be
responsible for any commissions or discounts due to brokers or dealers. The
amount of those commissions or discounts will be negotiated before the sales. We
will pay all of the other offering expenses, which we estimate will total
$6,500.

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                   INVESTING IN THESE SHARES INVOLVES RISKS.
                    SEE "RISK FACTORS" BEGINNING ON PAGE 5.

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



THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE NOT
APPROVED OR DISAPPROVED THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS
TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

                  The date of this Prospectus is July 20, 1999


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YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. NEITHER WE
NOR THE SELLING STOCKHOLDERS HAVE AUTHORIZED ANYONE TO PROVIDE YOU WITH
INFORMATION DIFFERENT FROM THAT CONTAINED IN THIS PROSPECTUS. THE SELLING
STOCKHOLDERS ARE OFFERING TO SELL, AND SEEKING OFFERS TO BUY, SHARES OF COMMON
STOCK ONLY IN JURISDICTIONS WHERE OFFERS AND SALES ARE PERMITTED. IN THIS
PROSPECTUS, REFERENCES TO "WE," "US" AND "OUR" REFER TO ASPEN TECHNOLOGY, INC.
AND ITS SUBSIDIARIES.


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                                TABLE OF CONTENTS


                                                                            PAGE
                                                                            ----

Prospectus Summary........................................................... 3

Risk Factors................................................................. 5

Use of Proceeds..............................................................14

Selling Stockholders.........................................................14

Plan of Distribution.........................................................14

Legal Matters................................................................15

Experts......................................................................15

Where You Can Find More Information..........................................15



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                               PROSPECTUS SUMMARY

Because this is only a summary, it does not contain all of the information that
may be important to you. You should read the entire prospectus, including "Risk
Factors" and the information incorporated by reference, before deciding to
invest in shares offered by this prospectus.

                             ASPEN TECHNOLOGY, INC.

OUR BUSINESS:                 We are the leading supplier of software and
                              service solutions used by companies in the
                              process industries to design, operate and manage
                              their manufacturing processes. The process
                              industries include manufacturers of chemicals,
                              petrochemicals, petroleum products,
                              pharmaceuticals, pulp and paper, electric power,
                              food and beverages, consumer products, and metals
                              and minerals.

OUR SOFTWARE AND SERVICES:    We offer a comprehensive, integrated suite of
                              process manufacturing solutions that help process
                              manufacturers enhance their profitability by
                              improving their efficiency, productivity, capacity
                              utilization, safety and environmental compliance.
                              Our solutions facilitate these improvements
                              throughout the entire manufacturing life-cycle,
                              from research and development to engineering,
                              planning and scheduling, procurement, production
                              and distribution. In addition to software
                              solutions, we offer consulting services through
                              our staff of project engineers. Since May 1995, we
                              have acquired 16 companies and lines of business
                              to obtain technologies and expertise that
                              complement or enhance our core software and
                              services solutions.

OUR STRATEGY:                 Our objective is to extend our leadership in
                              providing process management solutions to the
                              process industries. To achieve this objective, we
                              pursue the following key strategies:

                              o    extending our technology leadership position
                                   by continuing to invest in research and
                                   development and to identify and pursue
                                   opportunities for strategic acquisitions;

                              o    increasing the integration of many of our
                                   products for the design, operation and
                                   management of process plants, and providing
                                   consulting services to implement this
                                   technology around the business processes of
                                   customers;

                              o    leveraging our position in the process
                                   industries to increase our supply chain
                                   business, and incorporating our supply chain
                                   technology as a key component of our
                                   integrated product offerings;

                              o    leveraging our installed customer base in the
                                   chemical, petrochemicals, petroleum products
                                   and pharmaceuticals industries by increasing
                                   the number of users of software currently
                                   licensed by our existing customers and by
                                   licensing complementary software and services
                                   to those customers;

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                              o    increasing our penetration of other process
                                   industries, particularly the pulp and paper,
                                   electric power, and food and beverage
                                   industries, as well as the semiconductor
                                   industry;

                              o    pursuing strategic acquisitions of
                                   complementary technologies and services
                                   capabilities; and

                              o    selectively partnering with providers of
                                   complementary products and services to
                                   supplement our ability to offer
                                   enterprise-wide solutions.

OUR CUSTOMERS:                We currently have more than 750 customers
                              worldwide, including 45 of the 50 largest chemical
                              companies, 18 of the 20 largest petroleum refiners
                              and 16 of the 20 largest pharmaceutical companies.

OUR ADDRESS:                  Our principal executive offices are located at Ten
                              Canal Park, Cambridge, Massachusetts 02141. Our
                              telephone number is (617) 949-1000. Our website is
                              located at www.aspentech.com; information
                              contained in our website is not a part of this
                              prospectus.

                                  THE OFFERING

COMMON STOCK OFFERED:         All of the 45,000 shares offered by this
                              prospectus are being sold by the selling
                              stockholders. The selling stockholders are former
                              stockholders of Syllogistics, Inc. who acquired
                              these shares as the result of our acquisition of
                              Syllogistics, Inc. in October 1998.

USE OF PROCEEDS:              We will not receive any of the proceeds from sales
                              of shares by the selling stockholders.



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                                  RISK FACTORS

An investment in shares of our common stock is risky. You should consider
carefully the following risk factors in addition to the remainder of this
prospectus, including information incorporated by reference, before purchasing
shares offered by this prospectus.

Some of the information in this prospectus contains forward-looking statements
that involve substantial risks and uncertainties. You can identify these
statements by forward-looking words such as "may," "will," "expect,"
"anticipate," "believe," "estimate," "continue" and similar words. You should
read statements that contain these words carefully because they (1) discuss our
future expectations, (2) contain projections of our future operating results or
financial condition or (3) state other "forward-looking" information. We believe
it is important to communicate certain of our expectations to our investors.
There may be events in the future, however, that we are not accurately able to
predict or over which we have no control. The risk factors listed in this
section, as well as any other cautionary language in this prospectus, provide
examples of risks, uncertainties and events that may cause our actual results to
differ materially from the expectations we describe in our forward-looking
statements. Before you invest in our common stock, you should be aware that the
occurrence of any of the events described in these risk factors and elsewhere in
this prospectus could have a material adverse effect on our business, financial
condition and results of operations. In such case, the trading price of our
common stock could decline and you could lose all or part of your investment.

OUR QUARTERLY OPERATING RESULTS MAY FLUCTUATE

Our operating results are difficult to predict and may fluctuate significantly
from quarter to quarter. If our operating results fall below the expectations of
investors or public market analysts, the price of our common stock could fall
dramatically.

Our operating results in the fiscal quarter and fiscal year ended June 30, 1998
were below the expectations of some public market analysts and investors,
principally because our services revenues grew more slowly than anticipated and
our company-wide expenses were higher than expected. Our operating results in
the fiscal quarter ended September 30, 1998 were below the expectations of some
public market analysts and investors, principally because our license revenues
were lower than anticipated. In each of October 1998 and April 1999, we
reassessed our business prospects for the remainder of fiscal 1999 and reduced
our internal estimates of revenues and earnings from previously anticipated
levels. On April 27, 1999, we announced that we had implemented a restructuring
program intended to reduce our operating costs and improve our productivity;
this restructuring included reducing our staff by approximately 200 employees,
as well as consolidating facilities, streamlining operations and rationalizing
some non-core products and activities acquired in recent years. Since July 27,
1998, the date on which we preliminarily announced our estimated results for the
fiscal quarter and year ended June 30, 1998, through the close of business on
July 19, 1999, the price per share of our common stock, as reported by the
Nasdaq National Market, decreased from $48.25 to $12.75.

Our revenues are difficult to forecast for a number of reasons:

o    License fees for our software products are substantial, and as a result
     the sales process for our solutions is lengthy, sometimes exceeding a year.
     The length of the sales process makes our software revenues difficult to
     predict, and the delay of one or more large orders could cause our
     quarterly revenues to fall substantially below expectations.

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o    We ship our software products within a short period after receipt of an
     order, and we usually do not have a material backlog of unfilled orders of
     software products. Consequently, our revenues from software licenses in any
     quarter depend substantially on the orders booked and shipped in that
     quarter. We historically have derived a majority of our quarterly software
     license revenues from license agreements consummated in the final weeks of
     the quarter. As a result, even a short delay in the consummation of an
     agreement may cause our revenues to fall below expectations for that
     quarter.

o    Our revenues during the first quarter of each fiscal year historically have
     declined from the immediately preceding fiscal quarter, in part because (1)
     a substantial portion of our revenues have been derived from foreign
     countries where business is slow during the summer months and (2) a
     relatively smaller portion of our software licenses have come up for
     renewal in the first quarter.

o    Fluctuating economic conditions may vary demand for our products and
     services in ways that are difficult to predict. For example, during an
     economic downturn in the process industries, some manufacturers may cancel
     orders due to cash flow concerns. Other manufacturers, however, may choose
     to accelerate or increase their orders for our software and services since
     they can use our solutions to improve their efficiency and productivity.

Most of our expenses, particularly employee compensation, are relatively fixed.
As a result, even relatively small variations in the timing of our revenues may
cause significant variations in our quarterly operating results and may result
in quarterly losses.

As a result of these factors, we believe that quarter-to-quarter comparisons of
our results of operations are not necessarily meaningful. You should not rely on
our quarterly results of operations to predict our future performance.

WE FACE SIGNIFICANT COMPETITION FOR A LIMITED SUPPLY OF QUALIFIED PROJECT
ENGINEERS

We derive a substantial portion of our revenues from services provided in
connection with extremely complex projects. In general, only highly qualified,
highly educated project engineers have the training and skills necessary to
complete these projects successfully. In order to continue to staff our current
and future projects, we will need to attract, motivate and retain a significant
number of qualified chemical and other project engineers. Qualified project
engineers are in short supply and we face significant competition for these
employees, from not only our competitors but also clients, academic institutions
and other enterprises. Other employers may offer project engineers significantly
greater compensation and benefits or more attractive career paths or geographic
locations than we are able to offer. Any failure on our part to hire, train and
retain a sufficient number of qualified project engineers would seriously damage
our business.

WE FACE INTENSE COMPETITION FROM A BROAD AND INCREASING RANGE OF VENDORS

We face intense competition from four primary sources:

o    commercial vendors of software products and related consulting services for
     one or more elements in the design, operation and management of
     manufacturing processes;

o    hardware vendors that offer software solutions in order to add value to
     their proprietary distributed control systems, or DCS, which use computer
     hardware systems, communication networks and


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     industrial instruments to measure, record and automatically control process
     variables during production;

o    large operating companies in the process industries that have developed
     their own proprietary software solutions; and

o    companies licensing proprietary manufacturing processes and providing
     consulting services.

Because of the breadth of our software and service offerings, we face
competition from different vendors depending on the solution in question:

o    With respect to particular software solutions, we compete with
     Chemstations, Inc., Hyprotech, Ltd. (a subsidiary of AEA Technology plc),
     The Foxboro Company, Simulation Sciences, Inc. and Wonderware Corporation
     (all of which are subsidiaries of Siebe plc), OSI Software, Inc., the
     Simcon division of ABB Asea Brown Boveri (Holding) Ltd., and several
     smaller competitors, such as Pavilion Technologies, Inc.

o    With the acquisition of Chesapeake Decision Sciences, Inc., we now compete
     with established commercial vendors of supply chain management software,
     including i2 Technologies, Inc. and Manugistics Group, Inc.

o    A number of vendors of enterprise resource planning, or ERP, software
     products, such as Baan Company N.V., J.D. Edwards Inc., Oracle Corporation,
     PeopleSoft, Inc., and SAP A.G., recently have entered the market for supply
     chain management solutions, expanded their existing presence in that
     market, or announced plans to enter into or expand their presence in that
     market. ERP solutions help a process manufacturer manage resources across
     the enterprise and enable the manufacturer to integrate front- and
     back-office business functions.

o    We also expect to encounter continuing competition from DCS solution
     vendors, such as Honeywell Inc., as they expand their software and service
     offerings to include additional aspects of process manufacturing.

In recent years, consolidation in our markets, such as the acquisitions by Siebe
plc of Simulation Sciences, Inc. and Wonderware Corporation and the acquisition
of Elsag Bailey by Asea Brown Boveri (Holding) Ltd. has expanded the breadth of
product and service offerings by some of our competitors. As a result of this
consolidation and the expansion of DCS and ERP vendors into additional markets,
we may compete from time to time with divisions of companies, such as Honeywell
Inc. and Siebe plc, with which we collaborate on other occasions. Our inability
to compete and cooperate simultaneously with these companies may seriously
damage our business.

OUR REVENUES ARE CONCENTRATED IN THE CHEMICALS, PETROCHEMICALS AND PETROLEUM
INDUSTRIES

We derive a substantial majority of our revenues from companies in the
chemicals, petrochemicals and petroleum industries. We expect that companies in
these industries will continue to account for a substantial majority of our
revenues for the foreseeable future. Our success therefore depends directly on
continued demand for our software and services by companies in these industries.

The chemicals, petrochemicals and petroleum industries are highly cyclical. We
believe that in the past chemical, petrochemical and petroleum companies have
delayed and reduced capital and operating

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expenditures as the result of economic downturns, as well as pricing pressures
experienced in connection with cost-containment measures and environmental
regulations. These industry patterns, as well as general domestic and foreign
economic conditions, could seriously damage our business.

On April 27, 1999, we announced that our revenues for the fiscal quarter ended
March 31, 1999 were below our expectations because of, among other things,
difficult economic conditions in the petroleum, chemicals and petrochemicals
sectors. In this environment, purchase decisions are taking longer and sales
cycles are more complex. In light of this situation, we implemented a
restructuring program intended to reduce our operating costs and improve our
productivity. This restructuring included reducing our staff by approximately
200 employees, as well as consolidating facilities, streamlining operations and
rationalizing some non-core products and activities acquired in recent years.

Recently some of our clients have completed or announced mergers with other of
our clients. For example, British Petroleum and Amoco merged their operations on
December 31, 1998, and the resulting entity, BP Amoco, announced in April 1999
that it had entered into an agreement to combine with ARCO. Exxon Corporation
and Mobil Corporation executed a merger agreement in December 1998. We are
unable to predict the effect, if any, that these consolidations will have on the
nature and quantity of software and services we provide to these clients.

OUR ACQUISITION STRATEGY INVOLVES RISKS

From May 1995 through October 1998, we completed 16 acquisitions. Through these
acquisitions, we have expanded our product and service offerings, entered new
markets, and increased the scope of our operations and the number of our
employees. While we are not currently a party to any agreements or
understandings for any material acquisitions, we expect to continue to acquire
both domestic and foreign companies as part of our growth strategy. Acquisitions
involve risks that could cause our actual growth to differ from our
expectations. For example:

o    We may be unable to continue to identify suitable acquisition candidates.
     In light of the consolidation trend in our industry, we face increasing
     competition for acquisition opportunities. This competition may
     substantially increase the cost of any acquisition we complete.

o    In future acquisitions, we may issue equity securities that could be
     dilutive to our shareholders. In those acquisitions, we also may incur
     additional debt and amortization expense related to goodwill and other
     intangible assets. This additional debt and amortization expense may
     materially and adversely affect our business and operating results.

o    We may be unable to integrate acquired businesses successfully and to
     realize anticipated economic, operational and other benefits in a timely
     manner. Integration of an acquired business is especially difficult when we
     acquire a business in a market in which we have limited or no expertise or
     a business with a corporate culture different from ours. If we are unable
     to successfully integrate acquired businesses, we may incur substantial
     costs and delays or other operational, technical or financial problems. In
     addition, the failure to integrate acquisitions successfully may divert
     management's attention from our existing business and may damage our
     relationships with our key clients and employees.

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WE NEED TO DEVELOP NEW SOFTWARE AND SERVICES

We face rapidly changing technology and continuing improvements in computer
hardware, operating systems, programming tools, programming languages and
database technology. In order to be successful, we must:

o    enhance our current software products and services;

o    integrate our current and future software offerings;

o    modify our products to operate on additional or new operating platforms or
     systems; and

o    develop in a timely and cost-effective manner new software and services
     that meet changing market conditions, including evolving customer needs,
     new competitive software and service offerings, emerging industry standards
     and changing technology.

We face rapidly changing technology and continuing improvements in computer
hardware, operating systems, programming tools, programming languages, and
database technology, as well as the development of open standards and interfaces
between our products and the products of other companies.

In the past, we have experienced delays in developing new products and enhancing
existing products, and on occasion we have postponed scheduled delivery dates
for products. Like many other software products, our software on occasion has
contained undetected errors or "bugs" that may not be detected for a number of
months after the delivery of the software. In order to be successful, we must
meet our customers' expectations with respect to product development,
enhancement and integration and our software and services must address
adequately the needs of our customers.

WE DEPEND ON THE SERVICES OF OUR CURRENT CHIEF EXECUTIVE OFFICER

Our future success depends to a significant degree on the skills, experience and
efforts of our executive officers, particularly Lawrence B. Evans, our principal
founder and Chairman and Chief Executive Officer. Dr. Evans has led us since our
incorporation in 1981. We do not have any employment contract requiring Dr.
Evans or any of our other executive officers to continue their employment for
any period of time, and we do not maintain any significant amount of key-person
life insurance on any of our executive officers. The loss of the services of Dr.
Evans would seriously damage our business.

WE MAY INCUR SIGNIFICANT COSTS AS THE RESULT OF PENDING SECURITIES LITIGATION

On October 5, 1998, a purported class action lawsuit was filed in the United
States District Court for the District of Massachusetts against us and certain
of our officers and directors, on behalf of purchasers of our common stock
between April 28, 1998 and October 2, 1998. This lawsuit seeks an unspecified
amount of damages and claims violations of Sections 10(b) and 20(a) of the
Securities Exchange Act of 1934, alleging that we and the named officers and
directors issued a series of materially false and misleading statements
concerning our financial condition, operations and integration of several
acquisitions. On October 26, 1998, a second purported class action lawsuit was
filed in the United States District Court for the District of Massachusetts
against us and certain of our officers and directors, on behalf of purchasers of
our common stock between April 28, 1998 and October 2, 1998. The complaint for
this second lawsuit is identical to the complaint for the first lawsuit, except
for the plaintiff's name. On November 20, 1998, a third purported class action
lawsuit was filed in the United States District

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Court for the District of Massachusetts against us and certain of our officers
and directors, on behalf of purchasers of our common stock between January 27,
1998 and October 2, 1998. The complaint for this third lawsuit is identical to
the two prior complaints, except for the plaintiff's name and the additional
reference to statements made between January 27, 1998 and April 28, 1998. On
January 27, 1999, in response to a motion to dismiss that we had filed, the
plaintiffs in the three class actions consolidated the three complaints. We
believe that we have meritorious legal defenses to these lawsuits, and we intend
to defend vigorously against these actions. We currently are unable, however, to
determine whether resolution of these matters will have a material adverse
impact on our financial position or results of operations, or we are unable to
estimate the amount of the loss, if any, that may result from resolution of
these matters. It is difficult for us to predict the results of complex legal
proceedings such as the securities litigation described above. This securities
litigation may be expensive and may disrupt our normal business operations.

WE ARE SUBJECT TO PRODUCT LIABILITY CLAIMS

The sale and implementation of our software products and services potentially
may result in significant product liability claims. Process manufacturers use
our software products and services in designing, operating and managing their
manufacturing processes at large facilities. Any failure of the software at
those facilities could result in significant claims for damages or for
violations of environmental, safety and other laws and regulations. Our
agreements with our customers generally contain provisions designed to limit our
exposure to potential product liability claims. These provisions may, however,
not be effective as a result of applicable laws or judicial decisions.

OUR PROPRIETARY TECHNOLOGY IS SUBJECT TO LIMITED PROTECTION

Our business could be materially and adversely affected if we are not able to
protect adequately our proprietary software and other proprietary intellectual
property rights. We rely on a combination of copyright, patent, trademark and
trade secret laws, license and confidentiality agreements, and software security
measures to protect our proprietary rights. Although we presently hold U.S. and
foreign registered trademarks and U.S. patents on certain of our proprietary
technology, we may be unable to obtain similar protection for our other
intellectual property. In addition, the laws of certain countries in which our
products are licensed do not protect our products and intellectual property
rights to the same extent as U.S. laws. We generally enter into non-disclosure
agreements with our employees and customers and restrict access to, and
distribution of, our proprietary information. Nevertheless, we may be unable to
deter misappropriation of our proprietary information, detect unauthorized use
and take appropriate steps to enforce our intellectual property rights. Our
competitors also may independently develop technologies that are substantially
equivalent or superior to our technology. Although we believe that our services
and products do not infringe on the intellectual property rights of others, we
cannot prevent someone else from asserting a claim against us in the future for
violating their technology rights.

OUR INTERNATIONAL OPERATIONS INVOLVE ADDITIONAL RISKS

In fiscal 1996, 1997 and 1998 and the first nine months of fiscal 1999, we
derived 42.0%, 50.0%, 45.4% and 53.3% of our revenues from customers outside the
United States. We anticipate that revenues from international customers will
continue to account for a significant portion of our revenues for the
foreseeable future. Our international operations are subject to additional
risks, including:

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o    fluctuations in exchange rates may reduce our earnings, particularly where
     we denominate arrangements with international customers in the currency of
     the country in which our software or services are provided, and the hedging
     techniques we implement may be expensive and may not fully eliminate the
     impact of exchange rate fluctuations on our operating results;

o    tariffs and other barriers may reduce our ability to sell our solutions or
     may reduce the profitability of those solutions;

o    political and economic instability, such as the economic downturn in Asia
     in 1998, may lead to reduced demand for our solutions or make it difficult
     for us to offer our products;

o    changes in technology standards, such as interfaces between products, that
     are developed by European or foreign groups may require additional
     development efforts by us or may change the buying behavior of some of our
     customers;

o    unexpected changes in regulatory requirements may decrease the usefulness
     of our solutions for process manufacturers and therefore reduce the demand
     for those solutions;

o    we may experience difficulties in managing a global network of distributors
     or representatives and in staffing and managing foreign subsidiary
     operations;

o    we may encounter difficulties or delays in translating products and product
     documentation into foreign languages;

o    we may suffer potentially adverse tax consequences from operations in a
     large number of countries; and

o    the adoption and use of the euro, the single European currency introduced
     in January 1999, may adversely affect our business in ways we cannot
     currently predict.

WE MUST INCREASE OUR MARKET PENETRATION

Our failure to achieve increased market penetration in the process industries
would substantially restrict our future growth and damage our business
prospects. Our ability to increase market penetration will depend upon a number
of factors, including product performance, accuracy of results, reliability,
breadth and integration of product offerings, scope of applications, and ease of
implementation and use.

OUR PRODUCTS, SERVICES AND SYSTEMS MAY NOT BE YEAR 2000 COMPLIANT

Many existing computer systems and software applications use only two digits to
identify a year in the date field. These systems and applications were designed
and developed without considering the impact of the upcoming change in the
century. If not corrected, year 2000 problems may cause many computer
applications to fail or create erroneous results for calculations involving
years after 1999.

If we are not able to develop or offer, in a timely manner, year 2000 compliant
products and product updates, we may suffer the following consequences:

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o    We could experience a significant loss of revenues. Customers may decide
     not to purchase our products and services, or may decide to delay
     purchasing our products or services in anticipation of our future release
     of year 2000 compliant products.

o    Year 2000 errors in our products could materially impair the utility of our
     products and services and could result in significant product liability
     claims against us.

o    We could incur significant expenses in making our products, services and
     internal systems year 2000 compliant. We currently believe the total costs
     to be incurred for all of our year 2000 related projects will not have a
     material impact on our operating results. Currently unidentified year 2000
     problems may, however, cause us to incur material unanticipated expenses.
     We are assessing these costs on an ongoing basis in order to adjust our
     spending plans as necessary.

We have undertaken, but not completed, a program to determine whether and to
what extent we may need to update our software products and service processes to
become year 2000 compliant. We have tested and determined that substantially all
of our standard products are compliant. We have not, however, completed testing
on the work processes of our service groups. We do not intend to test or modify
all prior versions of our software products, current products used on year 2000
non-compliant systems, custom applications developed by or for customers, or
certain current software products that we plan to replace with either new
software products or year 2000 compliant releases by the end of 1999. Until we
have completed our assessment, we cannot be sure that our efforts to address
year 2000 issues are adequate. Although we have obtained representations as to
year 2000 compliance from the sellers of certain of our recently acquired
technologies, we cannot be certain that we will not encounter year 2000 problems
arising from these technologies. Moreover, the ability of our software products
and services to comply with year 2000 requirements depends in part upon the
availability of year 2000 compliant versions of operating systems and software
applications used by or with our products and services.

We are evaluating the readiness of those of our internal systems that are
business-critical. We consider hardware, software, systems, technologies and
applications to be "business-critical" if a failure would either have a material
adverse impact on our business or involve a safety risk to our employees or
customers. We have reviewed certain of our internal systems and future system
plans to assess year 2000 compliance. We expect that our internal system
development plans will address the year 2000 issue and will correct any existing
non-compliant systems without the need to accelerate the overall information
systems implementation plans. Our business would be adversely affected if there
are unidentified dependencies on internal systems to operate the business, or if
any required modifications are not completed on a timely basis or are more
costly to implement than currently anticipated.

OUR STOCK PRICE MAY FLUCTUATE SIGNIFICANTLY

Our common stock is traded on the Nasdaq National Market. The market price of
our common stock could fluctuate substantially based on a variety of factors
such as our financial performance, announcements concerning us or our key
clients or competitors, technological innovations, litigation or changes in
earnings estimates by analysts. Stock prices may fluctuate widely for reasons
unrelated to operating results. Fluctuations in general economic, political and
market conditions, such as recessions or international currency fluctuations,
may adversely affect the market price of our common stock.

The market price of our common stock has been volatile over the past year. Our
operating results in the fiscal quarter and fiscal year ended June 30, 1998 were
below the expectations of some public market analysts and investors, principally
because our services revenues grew more slowly than anticipated and

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our company-wide expenses were higher than expected. Our operating results in
the fiscal quarter ended September 30, 1998 were below the expectations of some
public market analysts and investors, principally because our licenses revenues
were lower than anticipated. During the fiscal quarter ending December 31, 1998,
we reassessed our business prospects for the last three quarters of fiscal 1999
and significantly reduced our internal estimates of revenues and earnings from
previously anticipated levels. On April 27, 1999, we announced that we had
implemented a restructuring program intended to reduce our operating costs and
improve our productivity; this restructuring included reducing our staff by
approximately 200 employees, as well as consolidating facilities, streamlining
operations and rationalizing some non-core products and activities acquired in
recent years. Since July 27, 1998, the date on which we preliminarily announced
our estimated results for the fiscal quarter and year ended June 30, 1998, the
price per share of our common stock, as reported by the Nasdaq National Market,
decreased from $48.25 to a low of $6.125 on October 5, 1998. On July 19, 1999,
the last reported sale price of our common stock on the Nasdaq National Market
was $12.75.

OUR ANTI-TAKEOVER PROVISIONS MAY DISCOURAGE POTENTIAL TAKEOVER ATTEMPTS

Certain provisions of our certificate of incorporation and Delaware law could be
used by our incumbent management to make it more difficult for a third party to
acquire control of us, even if the change in control might be beneficial to our
stockholders. This could discourage potential takeover attempts and could
adversely affect the market price of our common stock.

In particular, we may issue preferred stock in the future without stockholder
approval, upon terms determined by our board of directors. The rights of holders
of our common stock would be subject to, and may be adversely affected by, the
rights of holders of any preferred stock issued in the future. The issuance of
preferred stock could have the effect of making it more difficult for a third
party to acquire, or of discouraging a third party from acquiring, a majority of
our outstanding stock. We have adopted a stockholder rights plan that may deter
or delay attempts to acquire us or to accumulate shares of common stock.

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<PAGE>   14


                                 USE OF PROCEEDS

All of the shares of common stock offered by this prospectus are being offered
by the selling stockholders. For information about the selling stockholders, see
"Selling Stockholders." We will not receive any proceeds from sales of these
shares.

                              SELLING STOCKHOLDERS

The selling stockholders are the former stockholders of Syllogistics, Inc.,
which we acquired in October 1998. The shares they received in the acquisition
have been registered in accordance with the provisions of a registration rights
covenant entered into in connection with the acquisition.

The following table sets forth certain information with respect to the
beneficial ownership of our common stock by the selling stockholders as of June
1, 1999 and as adjusted to reflect the sale of the shares of common stock
offered by this prospectus. Beneficial ownership is determined in accordance
with the rules of the Securities and Exchange Commission and generally includes
voting or investment power with respect to securities. Except as indicated, each
of the selling stockholders possesses sole voting and investment power with
respect to all of the shares of common stock owned by them, subject to community
property laws where applicable.
<TABLE>
<CAPTION>
                                                                        SHARES TO BE
                                    SHARES                            BENEFICIALLY OWNED
                              BENEFICIALLY OWNED       NUMBER         AFTER OFFERING IF
                              PRIOR TO OFFERING       OF SHARES        ALL SHARES SOLD
                              -----------------         BEING          ---------------
NAME                          NUMBER    PERCENT        OFFERED        NUMBER    PERCENT
- ----                          ------    -------        -------        ------    -------
<S>                          <C>          <C>           <C>            <C>        <C>
Jacob B. Bercu..............  4,500        *             4,500          --         --

Daniel Mark Sims............ 40,500        *            40,500          --         --
</TABLE>
- ----------------
*    Percentage of shares beneficially owned is less than 1.0%.

                              PLAN OF DISTRIBUTION

The shares offered by this prospectus may be sold from time to time by selling
stockholders, who consist of the persons named under "Selling Stockholders"
above and those persons' pledgees, donees, transferees or other successors in
interest. The selling stockholders may sell the shares on the Nasdaq National
Market or otherwise, at market prices or at negotiated prices. They may sell
shares by one or a combination of the following:

     o    a block trade in which a broker or dealer so engaged will attempt to
          sell the shares as agent, but may position and resell a portion of the
          block as principal to facilitate the transaction;

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

     o    ordinary brokerage transactions and transactions in which a broker
          solicits purchasers.

In effecting sales, brokers or dealers engaged by the selling stockholders may
arrange for other brokers or dealers to participate. Brokers or dealers will
receive commissions or discounts from selling stockholders in amounts to be
negotiated prior to the sale. The selling stockholders and any broker-dealers
that participate in the distribution may be deemed to be "underwriters" within
the meaning of

                                       14

<PAGE>   15


Section 2(11) of the Securities Act of 1933, and any proceeds or commissions
received by them, and any profits on the resale of shares sold by
broker-dealers, may be deemed to be underwriting discounts and commissions.

If any selling stockholder notifies us that a material arrangement has been
entered into with a broker-dealer for the sale of shares through a block trade,
special offering, exchange distribution or secondary distribution or a purchase
by a broker or dealer, we will file, a prospectus supplement, if required
pursuant to Rule 424(c) under the Securities Act of 1933, setting forth:

     o    the name of each of the participating broker-dealers,

     o    the number of shares involved,

     o    the price at which the shares were sold,

     o    the commissions paid or discounts or concessions allowed to the
          broker-dealers, where applicable,

     o    a statement to the effect that the broker-dealers did not conduct any
          investigation to verify the information set out or incorporated by
          reference in this prospectus, and

     o    any other facts material to the transaction.

                                  LEGAL MATTERS

Foley, Hoag & Eliot LLP, Boston, Massachusetts, has advised us with respect to
the validity of the shares of common stock offered by this prospectus.

                                     EXPERTS

Our consolidated balance sheets as of June 30, 1997 and 1998 and our related
consolidated statements of operations, stockholders' equity and cash flows for
the years ended June 30, 1996, 1997 and 1998 incorporated by reference in this
prospectus from our Annual Report on Form 10-K for the fiscal year ended June
30, 1998 have been audited by Arthur Andersen LLP, independent public
accountants, to the extent and for the periods indicated in their reports
included in that Form 10-K and are incorporated by reference in this prospectus
in reliance upon the authority of Arthur Andersen LLP as experts in auditing and
accounting.

                       WHERE YOU CAN FIND MORE INFORMATION

We file annual reports, quarterly reports, current reports, proxy statements and
other information with the Securities and Exchange Commission (the "SEC"). You
may read and copy our SEC filings at the SEC's public reference room at 450
Fifth Street, N.W., Washington D.C. 20549. You may call the SEC at
1-800-SEC-0330 for further information about the public reference room. Our SEC
filings also are available on the SEC's website at http://www.sec.gov.

The SEC allows us to "incorporate by reference" information from certain of our
other SEC filings. This means that we can disclose information to you by
referring you to those other filings, and the information incorporated by
reference is considered to be part of this prospectus. In addition, certain
information that

                                       15

<PAGE>   16


we file with the SEC after the date of this prospectus will automatically
update, and in some cases supersede, the information contained or otherwise
incorporated by reference in this prospectus. We are incorporating by reference
the information contained in the following SEC filings:

o    our Annual Report on Form 10-K for the fiscal year ended June 30, 1998 (as
     filed on September 28, 1998);

o    our Quarterly Reports on Form 10-Q for the fiscal quarters ended September
     30, 1998 (as filed on November 16, 1998 and as amended by Amendment No. 1
     filed on November 20, 1998), December 31, 1998 (as filed on February 16,
     1999) and March 31, 1999 (as filed on May 13, 1999);

o    our Current Reports on Form 8-K dated October 2, 1998 (as filed on October
     6, 1998), October 5, 1998 (as filed on October 7, 1998) and April 27, 1999
     (as filed on May 10, 1999);

o    our definitive Proxy Statement (as amended by Amendment No. 1 filed on
     November 18, 1998) being used in connection with our Annual Meeting of
     Stockholders held on December 15, 1998;

o    the description of our common stock contained in our Registration Statement
     on Form 8-A (as amended by Amendment No. 1 filed on June 12, 1998);

o    the description of our rights to purchase Series A Participating Cumulative
     Preferred Stock contained in our Registration Statement on Form 8-A filed
     on October 10, 1997 under Section 12 of the Exchange Act; and

o    any filings we make with the SEC under Section 13(a), 13(c), 14 or 15(d) of
     the Securities Exchange Act of 1934 after the date of this prospectus
     (information in these filings will be incorporated as of the filing date).

You may request copies of these filings, at no cost, by writing, telephoning or
e-mailing our Manager of Investor Relations as follows:

                    Aspen Technology, Inc.
                    Ten Canal Park
                    Cambridge, Massachusetts 02141
                    Telephone: (617) 949-1000
                    E-mail: [email protected].

This prospectus is part of a Registration Statement on Form S-3 we filed with
the SEC under the Securities Act of 1933. This prospectus does not contain all
of the information contained in the Registration Statement.


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