OPNET TECHNOLOGIES INC
S-1/A, 2000-05-11
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>


   As filed with the Securities and Exchange Commission on May 11, 2000

                                                Registration No. 333-32588

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

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

                             Amendment No. 1

                                    to
                                   FORM S-1
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

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

                           OPNET TECHNOLOGIES, INC.
            (Exact name of registrant as specified in its charter)

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

       Delaware                      7373                52-1483235
    (State or other      (Primary Standard Industrial (I.R.S. Employer
    jurisdiction of       Classification Code Number)
                                                   Identification Number)
   incorporation or
     organization)
                        3400 International Drive, N.W.
                            Washington, D. C. 20008
                                (202) 364-4700
   (Address, Including Zip Code, and Telephone Number, Including Area Code,
                 of Registrant's Principal Executive Offices)

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

                                 Marc A. Cohen
               Chairman of the Board and Chief Executive Officer
                           OPNET TECHNOLOGIES, INC.
                        3400 International Drive, N.W.
                            Washington, D.C. 20008
                                (202) 364-4700
               (Name, Address, Including Zip Code, and Telephone
              Number, Including Area Code, of Agent for Service)
                                  Copies to:
       Brent B. Siler, Esq.                  Lorraine Massaro, Esq.
        HALE AND DORR LLP                    MORRISON & FOERSTER LLP
  1455 Pennsylvania Avenue, N.W.           1290 Avenue of the Americas
      Washington, D.C. 20004                   New York, NY 10104
    Telephone: (202) 942-8400               Telephone: (212) 468-8000
     Telecopy: (202) 942-8484               Telecopy: (212) 468-7900

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

   Approximate date of commencement of proposed sale to the public: As soon as
practicable after the effective date hereof.
   If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act,
check the following box. [_]
   If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_]
   If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the
same offering. [_]
   If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration number of the earlier effective registration statement for the
same offering. [_]
   If delivery of the Prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

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

   The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states that this
Registration Statement shall thereafter become effective in accordance with
Section 8(a) of the Securities Act of 1933 or until the Registration Statement
shall become effective on such date as the Commission, acting pursuant to said
Section 8(a), may determine.

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+                                                                              +
+The information in this prospectus is not complete and may be changed. We may +
+not sell these securities until the registration statement filed with the     +
+Securities and Exchange Commission is effective. This prospectus is not an    +
+offer to sell these securities and we are not soliciting offers to buy these  +
+securities in any state where the offer or sale is not permitted.             +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

PROSPECTUS (Subject to Completion)

Issued May 11, 2000

                                       Shares

                                  [OPNET Logo]

                            OPNET Technologies, Inc.

                               COMMON STOCK

                                  -----------

OPNET Technologies, Inc. is offering    shares of its common stock. This is our
initial public offering and no public market currently exists for our shares.
We anticipate that the initial public offering price for our shares will be
between $   and $   per share.

                                  -----------

We have applied to have our common stock quoted on the Nasdaq National Market
under the symbol "OPNT."

                                  -----------

Investing in the common stock involves risks. See "Risk Factors" beginning on
page 7.

                                  -----------

                              PRICE $   A SHARE

<TABLE>
<CAPTION>
                                                       Underwriting
                                              Price to Discounts and Proceeds to
                                               Public   Commissions    Company
                                              -------- ------------- -----------
<S>                                           <C>      <C>           <C>
Per Share....................................   $           $            $
Total........................................  $           $            $
</TABLE>

OPNET Technologies, Inc. has granted the underwriters the right to purchase up
to an additional      shares of common stock to cover over-allotments.

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.


Morgan Stanley & Co. Incorporated expects to deliver the shares of common stock
to investors on     , 2000.

                                  -----------

                        MORGAN STANLEY DEAN WITTER

      , 2000
<PAGE>

[Inside Front Cover]

                       Software that Understands Networks


OPNET's products enable our customers to optimize the performance and maximize
the availability of networks and applications. Our products use predictive
simulation technology to assess future network and application performance under
a wide range of operating conditions.

The below descriptions appear in the left column on this page.

[OPNET IT DecisionGuru Logo]

OPNET IT DecisionGuru

Maximizes network availability, optimizes network and application performance
and reduce network operating costs.  The letters S, E, and N appear, each in a
circle.

[OPNET Netbiz Logo]

OPNET Netbiz

Facilitates and accelerates the sales process for network equipment and services
by automating network design and proposal generation.  The letters S and N
appear, each in a circle.

[OPNET Modeler Logo]

OPNET Modeler

Accelerates development of network equipment and protocols by enabling the
testing of product designs prior to manufacturing.  The letter N appears in a
circle.

The below photographs and captions appear in the right column on this page.

A photograph of a network control room appears at the top of the column, with
the letter S in a circle, and the captions "Service Provider/Carrier" and
"Telecommunications Carriers, ISPs, ASPs, Wireless Network Operators, Cable
Service Providers."

A photograph of a group of people sitting around a table appears in the middle,
with the letter E in a circle, and the caption "Enterprises."

A photograph of a technician working on an item of network equipment appears at
the bottom of the column, with the letter N in a circle, and the caption
"Network Equipment Manufacturers."
<PAGE>


                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                Page
                                                                ----
<S>                                                             <C>
Prospectus Summary........................................        4
Risk Factors..............................................        7
Special Note Regarding Forward-
 Looking Statements.......................................       14
Use of Proceeds...........................................       15
Dividend Policy...........................................       15
Capitalization............................................       16
Dilution..................................................       17
Selected Consolidated Financial
 Data.....................................................       18
Management's Discussion and Analysis
 of Financial Condition and Results
 of Operations............................................       19
Business..................................................       27
Management................................................       41
Related Party Transactions................................       49
Principal Stockholders....................................       50
Description of Capital Stock..............................       51
Shares Eligible for Future Sale...........................       54
Underwriters..............................................       56
Legal Matters.............................................       59
Experts...................................................       59
Where You Can Find More
 Information..............................................       59
Index to Consolidated Financial
 Statements...............................................      F-1
</TABLE>

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

You should rely only on the information contained in this prospectus. We have
not authorized anyone to provide you with information different from that
contained in this prospectus. We are offering to sell shares of common stock
and seeking offers to buy shares of common stock only in jurisdictions where
offers and sales are permitted. The information contained in this prospectus
is accurate as of the date of this prospectus. In this prospectus, the
"Company," "we," "us" and "our" refer to OPNET Technologies, Inc.

Until      , 2000 (25 days after the commencement of this offering), all
dealers that buy, sell or trade shares, whether or not participating in this
offering, may be required to deliver a prospectus. This is in addition to the
dealers' obligation to deliver a prospectus when acting as underwriters and
with respect to their unsold allotments or subscriptions.

IT DecisionGuru(TM), Netbiz(TM), OPNET(R), OPNET Modeler(R), OPNET
Technologies(TM), and OPNETWORK(TM) are trademarks or service marks of OPNET.
Other trademarks or service marks appearing in this prospectus are the
property of their respective holders.

                                       3
<PAGE>


                            PROSPECTUS SUMMARY

   You should read the following summary together with the more detailed
information regarding our company, our common stock being sold in this offering
and our financial statements and notes thereto appearing elsewhere in this
prospectus.

                         OPNET TECHNOLOGIES, INC.

   We provide predictive network management software solutions that enable
organizations to optimize the performance and maximize the availability of
communications networks and networked applications. Our suite of products
advances network and application management beyond reactive problem
identification and reporting to proactive problem resolution and avoidance. The
OPNET product suite combines predictive simulation and a comprehensive
understanding of network technologies to enable network professionals to more
effectively design and deploy networks, diagnose network and application
performance problems, and predict the impact of proposed network modifications.

   Organizations increasingly depend upon their networks and applications to
successfully execute their business strategies. The design, operation, and
management of these networks are becoming more complex, and service providers
and enterprises must now manage the convergence of data, voice, and video
traffic over wireline and wireless architectures, integrating numerous existing
and emerging technologies. As the complexity of networks continues to increase,
so does the need for sophisticated solutions to manage network resources
effectively.

   Our OPNET product suite consists of three primary software solutions: OPNET
IT DecisionGuru, OPNET Modeler, and OPNET Netbiz. OPNET IT DecisionGuru enables
service providers and enterprises to more effectively design and deploy
networks and to predict the performance of their networks and applications.
OPNET Modeler enables network equipment manufacturers to accelerate the design
and development of network equipment and communication protocols. OPNET Netbiz
facilitates and accelerates the sales process for service providers and network
equipment manufacturers by automating network design and proposal generation.
In addition, we provide comprehensive libraries of models of a wide range of
network technologies and communication protocols to enable our products to
simulate and analyze networks and applications.

   Using our simulation-based products, we believe our customers are more
quickly and cost-effectively able to:

  . design, deploy, and operate new networks, network services, and network
    equipment;

  . adapt their existing network infrastructure and network services to meet
    their business-critical performance objectives;

  . proactively identify and avoid network and application performance
    problems;

  . define achievable performance and availability requirements for network
    services and applications, commonly known as service level agreements;
    and

  . streamline the sales process for network services and network equipment.

   We sell our products through our direct sales force, our international
distributors, and original equipment manufacturers and resellers. We market our
products to service providers, such as telecommunications carriers, Internet
service providers, or ISPs, and application service providers, or ASPs, large
and medium-sized enterprises, and network equipment manufacturers. Since
inception, we have sold our products to over 500 customers, including service
providers, such as AT&T, British Telecom, MCI WorldCom, SBC Communications,
Sprint, UUNET Technologies, and Vodafone AirTouch; enterprises, such as Boeing,
IBM, National Semiconductor, RR Donnelley, and Texas Utilities; and network
equipment manufacturers, such as 3Com, Cisco Systems, Ericsson, Motorola,
Nokia, and Nortel Networks.

                                       4
<PAGE>


   We intend to enhance our leadership position in the expanding market for
predictive network management software solutions by:

  . increasing penetration of the service provider market;

  . expanding our direct and international sales efforts;

  . leveraging our existing customer base;

  . introducing new products and enhancing the functionality of existing
    products; and

  . developing additional strategic relationships.

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

   Our corporate offices are located at 3400 International Drive, N.W.,
Washington, D.C. 20008 and our telephone number is (202) 364-4700. Our
predecessor was incorporated in Maryland under the name MIL 3, Incorporated on
November 1, 1986, and we incorporated in Delaware on November 23, 1988 under
the same name. We changed our name to OPNET Technologies, Inc. on February 2,
2000. Our Web address is www.opnet.com. We do not intend that the information
on our Web site constitutes a part of this prospectus.

                               THE OFFERING

<TABLE>
 <C>                                                  <S>
 Common stock offered................................      shares
 Common stock to be outstanding after this offering..      shares
 Over-allotment option...............................      shares
 Use of proceeds..................................... We intend to use the net
                                                      proceeds from this
                                                      offering for general
                                                      corporate purposes,
                                                      including working capital
                                                      and capital expenditures.
                                                      See "Use of Proceeds."
 Proposed Nasdaq National Market symbol.............. OPNT
</TABLE>

   The number of shares of common stock to be outstanding after this offering
excludes:

  .      shares of common stock issuable upon the exercise of outstanding
    stock options at a weighted average exercise price of $     per share;

  .      shares of common stock to be issuable upon the exercise of stock
    options that we expect to grant to some of our employees and directors
    upon the completion of this offering with an exercise price equal to the
    initial public offering price per share in this offering; and

  .       shares of common stock reserved for future issuance under our stock
    plans.

                                       5
<PAGE>


                    SUMMARY CONSOLIDATED FINANCIAL DATA

   The following table is a summary of our consolidated financial data. You
should read this information together with our consolidated financial
statements and the related notes appearing at the end of this prospectus and
the information under "Management's Discussion and Analysis of Financial
Condition and Results of Operations." The pro forma balance sheet data gives
effect to the conversion of all our outstanding convertible preferred stock
into shares of our common stock, which will occur automatically upon the
completion of this offering. The pro forma as adjusted balance sheet data also
reflects the sale of the common stock offered by us, after deducting estimated
underwriting discounts and estimated offering expenses payable by us.

<TABLE>
<CAPTION>
                                         Year Ended March 31,
                                 --------------------------------------
                                  1996   1997   1998    1999     2000
                                 ------ ------ ------- -------  -------
                                     (in thousands, except per share data)
<S>                              <C>    <C>    <C>     <C>      <C>     <C> <C>
Statement of Operations Data:
Total revenues.................  $5,989 $8,615 $11,929 $12,003  $19,235
Gross profit...................   5,331  7,607  10,514  10,621   15,632
Income (loss) from operations..   1,360  2,505   2,590    (269)     333
Net income.....................     872  1,492   1,775     207      575
Net income applicable to common
 shares........................     872  1,492   1,766     193      561
Basic net income applicable per
 common share..................  $  .11 $  .19 $   .24 $   .03  $   .08
Diluted net income per common
 share.........................  $  .11 $  .19 $   .21 $   .02  $   .06
Weighted average shares
 outstanding (basic)...........   7,683  7,783   7,435   7,107    7,175
Weighted average shares
 outstanding (diluted).........   7,746  7,901   8,598   9,084    9,609
</TABLE>

<TABLE>
<CAPTION>
                                                        As of March 31, 2000
                                                    ----------------------------
                                                                      Pro Forma
                                                    Actual Pro Forma As Adjusted
                                                    ------ --------- -----------
                                                           (in thousands)
<S>                                                 <C>    <C>       <C>
Balance Sheet Data:
Cash and cash equivalents.......................... $8,765  $8,765      $
Working capital....................................  7,112   7,112
Total assets....................................... 16,713  16,713
Total stockholders' equity.........................  3,468  10,416
</TABLE>

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

   Except as otherwise indicated, information in this prospectus:

  .  reflects a   -for-   stock split of all outstanding shares of our common
     stock to be effected prior to the completion of this offering;

  .  gives effect to the conversion of all outstanding convertible preferred
     stock into an aggregate of      shares of our common stock, which will
     occur automatically upon the completion of this offering;

  .  assumes our common stock will be sold at $    per share, which is the
     mid-point of the range shown on the cover of this prospectus; and

  .  assumes the underwriters do not exercise their over-allotment option to
     purchase additional shares in this offering.


                                       6
<PAGE>

                                 RISK FACTORS

   You should carefully consider the following risk factors and all other
information contained in this prospectus before investing in our common stock.
Investing in our common stock involves a high degree of risk. Any of the
following factors could harm our business and future operating results and
could result in a partial or complete loss of your investment.

Risks Related to Our Business and Industry

   Our operating results may fluctuate significantly as a result of factors
outside of our control, which could cause the market price of our stock to
decline

   Our operating results have fluctuated in the past, and are likely to
fluctuate significantly in the future. Our financial results may as a
consequence fall short of the expectations of public market analysts or
investors, which could cause the price of our common stock to decline. Our
revenues and operating results may vary significantly from quarter to quarter
due to a number of factors, many of which are beyond our control. Factors that
could affect our operating results include:

  . the timing of large orders;

  . changes in the mix of our sales, including the mix between higher margin
    software products and somewhat lower margin services and maintenance, and
    the proportion of our license sales requiring us to make royalty
    payments;

  . the timing and amount of our marketing, sales, and product development
    expenses;

  . the cost and time required to develop new software products;

  . the introduction, timing, and market acceptance of new products
    introduced by us or our competitors;

  . changes in network technology or in applications, which could require us
    to modify our products or develop new products;

  . general economic conditions, which can affect our customers' purchasing
    decisions and the length of our sales cycle;

  . changes in our pricing policies or those of our competitors; and

  . the timing and size of potential acquisitions by us.

   We expect to make significant expenditures in all areas of our business,
particularly sales and marketing operations, in order to promote future
growth. Because the expenses associated with these activities are relatively
fixed in the short term, we may be unable to adjust spending quickly enough to
offset any unexpected shortfall in revenue growth or any decrease in revenue
levels. In addition, our revenues in any quarter depend substantially on
orders we receive and ship in that quarter. We typically receive a significant
portion of orders in any quarter during the last month of the quarter, and we
cannot predict whether those orders will be placed and shipped in that period.
If we have lower revenues than we expect, we probably will not be able to
reduce our operating expenses quickly in response. Therefore, any significant
shortfall in revenues or delay of customer orders could have an immediate
adverse effect on our operating results in that quarter.

   For all of these reasons, quarterly comparisons of our financial results
are not necessarily meaningful and you should not rely on them as an
indication of our future performance.

   The market for predictive network management software is new and evolving,
and if this market does not develop as anticipated, our revenues will not
increase

   We derive all of our revenues from the sale of products and services that
are designed to allow our customers to manage the performance of networks and
applications. Therefore, we will be unable to grow our business and increase
our revenues if the market for predictive network management software does not

                                       7
<PAGE>


continue to grow. The market for predictive network management software
solutions is in an early stage of development. Therefore, we cannot accurately
assess the size of the market and may be unable to identify an effective
distribution strategy, the competitive environment that will develop, and the
appropriate features and prices for products to address the market. If we are
to be successful, our current and potential customers must recognize the value
of predictive network management software solutions, decide to invest in the
management of their networks, and, in particular, adopt and continue to use
our software solutions.

   We will not be able to grow our business if service providers do not buy
our products

   A key element of our strategy is to increase sales to service providers,
and our future performance will be significantly dependent upon increased
adoption by service providers of our software products. Accordingly, the
failure of our products to perform favorably in the service provider
environment or to gain wider adoption by service providers could have a
negative effect on our business and future operating results.

   We may not be able to increase our revenues in the future if our newest
products, OPNET IT DecisionGuru and OPNET Netbiz, do not gain widespread
market acceptance

   We expect to derive a substantial portion of our revenues in the future
from OPNET IT DecisionGuru and OPNET Netbiz, both of which were released in
August 1998. Our business depends on customer acceptance of these products and
our revenues may not increase if our target customers do not adopt and expand
their use of OPNET IT DecisionGuru and OPNET Netbiz. To date, we have not
achieved widespread market acceptance of either product. In addition, if our
OPNET Modeler product, which we have been selling since 1987, encounters
declining sales, which could occur for a variety of reasons, including market
saturation, and sales of our newer products do not grow at a rate sufficient
to offset the shortfall, our revenues would decline.

   If we do not expand our sales force, we may be unable to increase our
revenues

   We sell our products primarily through our direct sales force, and we must
expand the size of our sales force to increase revenues. If we are unable to
hire or retain qualified sales personnel, if newly hired personnel fail to
develop the necessary skills to be productive, or if they reach productivity
more slowly than anticipated, our ability to increase our revenues and grow
our business could be compromised. Our sales people require a long period of
time to become productive, typically three to six months. The time required to
reach productivity, as well as the challenge of attracting, training, and
retaining qualified candidates, may make it difficult to meet our sales force
growth targets. Further, we may not generate sufficient sales to offset the
increased expense resulting from growing our sales force or we may be unable
to manage a larger sales force.

   Our ability to increase our revenues will be impaired if we do not expand
and manage indirect distribution channels

   To increase our sales, we must, among other things, further expand and
manage our indirect distribution channels, which consist primarily of
international distributors and original equipment manufacturers and resellers.
If we are unable to expand and manage our relationships with our distributors,
our distributors are unable or unwilling to effectively market and sell our
products, or we lose existing distributor relationships, we might not be able
to increase our revenues. Sales through our indirect distribution channels
accounted for 29.8% of our total revenues for the fiscal year ended March 31,
1998, 26.9% for the fiscal year ended March 31, 1999, and 19.0% for the fiscal
year ended March 31, 2000. Our international distributors and original
equipment manufacturers and resellers have no obligation to market or purchase
our products. In addition, they could partner with our competitors, bundle or
resell competitors' products, or internally develop products that compete with
our products.

   We may not be able to successfully manage our expanding operations, which
could impair our ability to operate profitably

   We may be unable to operate our business profitably if we fail to manage
our growth. Our rapid growth has sometimes strained, and may in the future
continue to strain, our managerial, administrative, operational, and financial
resources and controls. We have grown from a total of 89 employees at March
31, 1999 to a total of

                                       8
<PAGE>


142 employees at March 31, 2000. We plan to continue to expand our operations
and increase the number of our full-time employees. Our ability to manage
growth will depend in part on our ability to continue to enhance our
operating, financial, and management information systems. Our personnel,
systems, and controls may not be adequate to support our growth. In addition,
our revenues may not continue to grow at a sufficient rate to absorb the costs
associated with a larger overall employee base.

   If we are unable to introduce new and enhanced products on a timely basis
that respond effectively to changing technology, our revenues may decline

   Our market is characterized by rapid technological change, changes in
customer requirements, frequent new product and service introductions and
enhancements, and evolving industry standards. If we fail to develop and
introduce new and enhanced products on a timely basis that respond to these
changes, our products could become obsolete, demand for our products could
decline and our revenues could fall. Advances in network management
technology, software engineering, simulation technology, or the emergence of
new industry standards, could lead to new competitive products that have
better performance, more features, or lower prices than our products and could
render our products unmarketable. In addition, the introduction and adoption
of future network technologies or application architectures could reduce or
eliminate the need for predictive network management software.

   If we fail to retain our key personnel and attract and retain additional
qualified personnel, we might not be able to sustain our revenue growth

   Our future success and our ability to sustain our revenue growth depend
upon the continued service of our executive officers and other key sales and
research and development personnel. The loss of any of our key employees, in
particular Marc A. Cohen, our chairman of the board and chief executive
officer, and Alain J. Cohen, our president and chief technology officer, could
adversely affect our ability to pursue our growth strategy. We do not have
employment agreements or any other agreements that obligate any of our
officers or key employees to remain with us.

   We must also continue to hire large numbers of highly qualified
individuals, particularly software engineers and sales and marketing
personnel. Our failure to attract and retain technical personnel for our
product development, consulting services, and technical support teams may
limit our ability to develop new products or product enhancements. Competition
for these individuals is intense, and we may not be able to attract and retain
additional highly qualified personnel in the future. In addition, limitations
imposed by federal immigration laws and the availability of visas could impair
our ability to recruit and employ skilled technical professionals from other
countries to work in the United States.

   Our international operations subject our business to additional risks which
could cause our sales or profitability to decline

   Sales of our products to customers outside North America accounted for
31.8% of our total revenues in fiscal 1998, 29.3% of our total revenues in
fiscal 1999, and 20.8% of our total revenues in the fiscal 2000. We plan to
increase our international sales activities, but these plans are subject to a
number of risks that could cause our sales to decline or could otherwise cause
a decline in profitability. These risks include:

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

  . political and economic instability;

  . difficulty in attracting distributors that will market and support our
    products effectively;

  . the need to comply with varying employment policies and regulations that
    could make it more difficult and expensive to manage our employees if we
    need to establish direct sales or support staff outside the United
    States;

                                       9
<PAGE>

  . potentially adverse tax consequences; and

  . the effects of currency fluctuations.

   Expanding our OPNET Netbiz consulting services business will be costly and
may not result in any compensating increase in sales or profitability

   We have recently begun to place additional emphasis on consulting services
delivered in conjunction with sales of OPNET Netbiz. The significant
additional expenditures and operational resources required to expand our OPNET
Netbiz consulting services business will place additional strain on our
management, financial, and operational resources and may make it more
difficult for us to maintain profitability. If OPNET Netbiz does not achieve
significant market acceptance, our customers will not engage our consulting
services organization to assist with consulting, custom development,
implementation support, and training for OPNET Netbiz. In addition, we may be
unable to attract or retain a sufficient number of the highly qualified
consulting services personnel that we expect the expansion of our consulting
services business will require.

   We face intense competition, which could cause us to lose sales

   The intense and increasing competition in our market could cause us to lose
sales, resulting in lower revenues and profitability. The market for
predictive network management software is evolving rapidly and is highly
competitive. We believe that this market is likely to become more competitive
as the demand for predictive network management solutions continues to
increase. Many of our current and potential competitors are larger and have
substantially greater financial and technical resources than we do. In
addition, it is possible that other vendors as well as some of our customers
or distributors will develop and market solutions that compete with our
products in the future.

   OPNET Modeler and OPNET IT DecisionGuru currently face or potentially will
face competition from several sources, including:

  . software vendors with predictive network management offerings, such as
    Compuware, and application performance diagnosis solutions, such as
    Optimal Networks;

  . consultants who offer predictive network management advisory services;
    and

  . customers who develop their own predictive network management
    capabilities, either internally or through outsourcing.

OPNET Netbiz competes with solutions designed to facilitate and automate sales
processes in general.

   If Internet infrastructure does not grow as currently anticipated, sales of
our OPNET Netbiz product may not grow

   Our OPNET Netbiz product addresses a new and emerging market for sales
process automation, including over the Internet, by service providers and
network equipment manufacturers. The failure of this market to develop, or a
delay in the development of this market, would reduce demand for OPNET Netbiz
and seriously harm our business. The success of OPNET Netbiz depends
substantially upon the widespread adoption of the Internet as a primary medium
for commerce and business applications. Moreover, critical issues concerning
the commercial use of the Internet, such as security, reliability, cost,
accessibility, and quality of service, remain unresolved and may negatively
affect the growth of Internet use or the attractiveness of commerce and
business communication over the Internet.

                                      10
<PAGE>


   Errors in our products and our inability to correct those errors could harm
our reputation and could cause our customers to demand refunds from us or
assert claims for damages against us

   Our software products could contain significant errors or bugs that may
result in:

  . the loss of or delay in market acceptance and sales of our products;

  . the delay in introduction of new products;

  . diversion of our resources;

  . injury to our reputation; and

  . increased support costs.

Bugs may be discovered at any point in a product's life cycle. We expect that
errors in our products will be found in the future, particularly in new
product offerings and new releases of our current products.

   Because our customers use our products to manage networks that are critical
to their business operations, any failure of our products could expose us to
product liability claims. In addition, errors in our products could cause our
customers' networks and systems to fail or compromise their data, which could
also result in liability to us. Product liability claims brought against us
could divert the attention of management and key personnel, could be expensive
to defend, and may result in adverse settlements and judgments.

   Our software products rely on our intellectual property, and any failure to
protect our intellectual property could enable our competitors to market
products with similar features that may reduce demand for our products, and
could allow the use of our products by users who have not paid the required
license fee

   If we are unable to protect our intellectual property, our competitors
could use our intellectual property to market products similar to our
products, which could reduce demand for our products. In addition, we may be
unable to prevent the use of our products by persons who have not paid the
required license fee, which could reduce our revenues. Our success and ability
to compete depend substantially upon the internally developed technology that
is incorporated in our products. Policing unauthorized use of our products is
difficult, and we may not be able to prevent misappropriation of our
technology, particularly in foreign countries where the laws may not protect
our proprietary rights as fully as those in the United States. Others may
circumvent the patents, copyrights, and trade secrets we own. In the ordinary
course of business, we enter into a combination of confidentiality, non-
competition, and non-disclosure agreements with our employees. These measures
afford only limited protection and may be inadequate, especially because our
employees are highly sought after and may leave our employ with significant
knowledge of our proprietary information. In addition, any confidentiality,
non-competition, and non-disclosure agreements we enter into may be found to
be unenforceable, or our copy protection mechanisms embedded in our software
products could fail or could be circumvented.

   Our products employ technology that may infringe on the proprietary rights
of others, and, as a result, we could become liable for significant damages

   We expect that our software products may be increasingly subject to third-
party infringement claims as the number of competitors in our industry segment
grows and the functionalities of products in different industry segments
overlap. Regardless of whether these claims have any merit, they could:

  . be time-consuming to defend;

  . result in costly litigation;

  . divert our management's attention and resources;

  . cause us to cease or delay product shipments; or

  . require us to enter into royalty or licensing agreements.

                                      11
<PAGE>

These royalty or licensing agreements may not be available on terms acceptable
to us, if at all. A successful claim of product infringement against us or our
failure or inability to license the infringed or similar technology could
adversely affect our business because we would not be able to sell the
affected product without redeveloping it or incurring significant additional
expense.

   If we undertake acquisitions, they may be expensive and disruptive to our
business and could cause the market price of our common stock to decline

   We may acquire or make investments in companies, products, or technologies
if opportunities arise. Any acquisitions could be expensive, disrupt our
ongoing business, distract our management and employees, and adversely affect
our financial results and the market price of our common stock. We may not be
able to identify suitable acquisition or investment candidates, and if we do
identify suitable candidates, we may not be able to make these acquisitions or
investments on commercially acceptable terms or at all. If we make an
acquisition, we could have difficulty integrating the acquired technology,
employees, or operations. In addition, the key personnel of the acquired
company may decide not to work for us. We also expect that we would incur
substantial expenses if we acquired other businesses or technologies. We might
use the net proceeds of this offering, incur debt, or issue equity securities
to pay for any future acquisitions. If we issue additional equity securities,
our stockholders could experience dilution and the market price of our stock
may decline.

   Our products are subject to changing computing environments, including
operating system software and hardware platforms, which could render our
products obsolete

   The evolution of existing computing environments and the introduction of
new popular computing environments may require us to redesign our products or
develop new products. Computing environments, including operating system
software and hardware platforms, are complex and change rapidly. Our products
are designed to operate in currently popular computing environments. Due to
the long development and testing periods required to adapt our products to new
or modified computing environments, we could experience significant delays in
product releases or shipments, which could result in lost revenues and
significant additional expense.

Risks Related to this Offering

   Our stock price may be volatile, which could lead to losses by investors
and to securities litigation

   Our stock may be subject to substantial price volatility, which may prevent
you from reselling our common stock at a profit. In addition, securities class
action litigation is often instituted against companies following periods of
volatility in their stock price. This type of litigation could result in
substantial costs and divert our management's attention and resources.

   Our common stock has never been sold in a public market. An active trading
market for our common stock may not develop or be sustained after completion
of this offering. The initial public offering price may not be indicative of
the prices that will prevail in the public market after this offering, and the
market price of our common stock could fall below the initial public offering
price.

   The value of your investment could decline due to the impact of any of the
following factors upon the market price of our common stock:

  . variations in our actual and anticipated operating results;

  . changes in estimates of our earnings by market analysts;

  . our failure to meet analysts' performance expectations; and

  . lack of liquidity.


                                      12
<PAGE>

   In addition, stock markets, particularly the Nasdaq National Market, have
experienced extreme price and volume fluctuations, and the market prices of
securities of technology companies, including software companies, have been
highly volatile. These fluctuations have often been unrelated to the operating
performance of these companies. Fluctuations such as these may affect the
market price of our common stock. Substantial sales of our common stock after
this offering could also cause our stock price to decline. As a result,
investors may not be able to resell their shares at or above the initial
public offering price.

   Our officers, directors, and their affiliates hold a majority of our stock
and, as a result, control us; this could limit your ability to influence the
outcome of key transactions, including changes of control

   We anticipate that our directors, officers, and individuals or entities
affiliated with our directors as a group will beneficially own approximately
  % of our outstanding common stock after the completion of this offering.
This could limit the ability of our other stockholders to influence matters
requiring approval by our stockholders, including the election of directors
and the approval of mergers or similar transactions.

   The provisions of our charter documents and Delaware law could delay or
prevent the sale of our company and diminish the voting rights of the holders
of our common stock

   There are provisions in our certificate of incorporation and by-laws that
make it more difficult for a third party to acquire, or attempt to acquire,
control of our company, even if a change in control would result in the
purchase of your shares at a premium to the market price. For example, our
board of directors has the authority to issue up to 5,000,000 shares of
preferred stock. The board of directors can fix the price, rights,
preferences, privileges, and restrictions of the preferred stock without any
further vote or action by our stockholders. The issuance of shares of
preferred stock may delay or prevent a change in control transaction. As a
result, the market price of our common stock and the voting and other rights
of our stockholders may be adversely affected. The issuance of preferred stock
may result in the loss of voting control to other stockholders.

   Our charter documents contain other provisions that could have an anti-
takeover effect, including:

  . only one of the three classes of directors is elected each year;

  . stockholders have limited ability to remove directors;

  . stockholders cannot take actions by written consent;

  . stockholders cannot call a special meeting of stockholders; and

  . stockholders must give advance notice to nominate directors or submit
    proposals for consideration at stockholder meetings.

In addition, we are subject to the anti-takeover provisions of Section 203 of
the Delaware General Corporation Law, which regulates corporate acquisitions.
These provisions could discourage potential acquisition proposals and could
delay or prevent a change in control transaction. They could also have the
effect of discouraging others from making tender offers for our common stock.
These provisions may also prevent changes in our management.

   The substantial number of shares that will be eligible for sale in the near
future could cause our common stock price to decline

   If our stockholders sell substantial amounts of our common stock in the
public market following this offering, the market price of our common stock
could decline. These sales also might make it more difficult for us to sell
equity or equity-related securities in the future at a time and price that we
deem appropriate. Upon completion of this offering, we will have outstanding
     shares of common stock, assuming no exercise of outstanding options. Of
these shares, the      shares sold in this offering will be freely tradable,
and      additional shares of common stock will be available for sale in the
public market 180 days after the

                                      13
<PAGE>

date of this prospectus following the expiration of lock-up agreements between
our stockholders and the underwriters. These stockholders may be released from
their lock-up agreements with the underwriters at any time and without notice,
which would allow for earlier sale of shares in the public market.

   If you invest in this offering, you will experience immediate and
substantial dilution

   We expect that the initial public offering price of our common stock will
be substantially higher than the book value per share of the outstanding
common stock. As a result, investors purchasing common stock in this offering
will incur immediate and substantial dilution. In the past, we issued options
to acquire our common stock at prices significantly below the initial public
offering price. To the extent these outstanding options are ultimately
exercised, there will be further dilution to investors in this offering. The
section headed "Dilution" appearing elsewhere in this prospectus contains more
information regarding the dilution you will experience if you invest in this
offering.

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

   This prospectus contains forward-looking statements that involve
substantial risks and uncertainties. You can identify these statements by
forward-looking words such as "anticipate," "believe," "could," "estimate,"
"expect," "intend," "may," "plan," "potential," "should," "will," and "would"
or similar words. You should read statements that contain these words
carefully because they discuss our future expectations, contain projections of
our future results of operations or of our financial position or state other
forward-looking information. We believe that it is important to communicate
our future expectations to our investors. However, there may be events in the
future that we are not able to predict or control accurately. The factors
listed above in the section captioned "Risk Factors," as well as any
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 the events described in these risk factors and elsewhere in
this prospectus could have a material adverse effect on our business, results
of operations, and financial position.

                                      14
<PAGE>

                                USE OF PROCEEDS

   We estimate that our net proceeds from the sale of the      shares of
common stock we are offering will be approximately $     million, or
approximately $     million if the underwriters exercise their over-allotment
option, assuming an initial public offering price of $   per share and after
deducting estimated underwriting discounts and commissions and estimated
offering expenses payable by us.

   The primary purposes of this offering are to obtain additional equity
capital, create a public market for our common stock, and facilitate future
access to public markets. We intend to use the net proceeds of this offering
for general corporate purposes, including working capital and capital
expenditures, although we have not allocated any of the proceeds to any
identifiable uses. We may also use a portion of the net proceeds to acquire
businesses, products, or technologies that are complementary to our business.
The types of acquisitions that we might make would largely depend upon the
business opportunties that we identify, if any, which we cannot predict at
this time. We presently have no agreements or commitments with respect to any
acquisition.

   Pending their use, we plan to invest the net proceeds in investment grade,
interest-bearing securities.

                                DIVIDEND POLICY

   We do not anticipate paying cash dividends in the foreseeable future. We
currently intend to retain all future earnings, if any, for use in the
operation of our business.

                                      15
<PAGE>

                                CAPITALIZATION

   The following table sets forth our capitalization as of March 31, 2000:

  . on an actual basis;

  . on a pro forma basis to reflect the automatic conversion of all
    outstanding convertible preferred stock into common stock on the
    completion of this offering; and

  . on a pro forma as adjusted basis to reflect the sale of the shares of
    common stock offered by us in this offering and our receipt of the
    estimated net proceeds, after deducting the estimated underwriting
    discounts and commissions and the estimated offering expenses that we
    expect to pay in connection with this offering.

   You should read this table along with "Management's Discussion and Analysis
of Financial Condition and Results of Operations," our consolidated financial
statements and the related notes and the other financial information in this
prospectus.

<TABLE>
<CAPTION>
                                                      As of March 31, 2000
                                                  ------------------------------
                                                                      Pro Forma
                                                  Actual   Pro Forma As Adjusted
                                                  -------  --------- -----------
                                                         (in thousands)
<S>                                               <C>      <C>       <C>
Long-term debt..................................  $   --    $   --     $  --
                                                  -------   -------    ------
Series A redeemable convertible preferred stock,
 $.001 par value;
 160,000 shares authorized, 144,640 shares
 issued and outstanding, actual; no shares
 authorized, issued or outstanding, pro forma
 and
 pro forma as adjusted..........................    6,948       --        --
Stockholders' equity:
  Preferred stock, undesignated, $.001 par
   value; 5,000,000 shares authorized; no shares
   issued and outstanding, actual, pro forma
   and pro forma as adjusted....................      --        --        --
  Common stock, $.001 par value; 100,000,000
   shares authorized;     shares issued and
   outstanding, actual;    shares
   issued and outstanding, pro forma;     shares
   issued and
   outstanding, pro forma as adjusted...........       11        13
  Additional paid-in capital....................      629     7,575
  Deferred compensation.........................     (287)     (287)
  Retained earnings.............................    7,125     7,125
  Treasury stock................................   (4,010)   (4,010)
                                                  -------   -------    ------
    Total stockholders' equity..................    3,468    10,416
                                                  -------   -------    ------
      Total capitalization......................  $10,416   $10,416    $
                                                  =======   =======    ======
</TABLE>

   The outstanding share information excludes:

  .      shares of common stock issuable upon exercise of outstanding options
    as of March 31, 2000, at a weighted average exercise price of $   per
    share; and

  .      shares of common stock reserved as of March 31, 2000 for future
    issuance under our stock plan.

   After March 31, 2000, our board of directors approved the grant to some of
our employees and directors upon the completion of this offering of additional
options exercisable to purchase     shares of our common stock with an
exercise price equal to the initial public offering price per share in this
offering, and options to purchase      shares of our common stock were
exercised. In addition, after March 31, 2000, we reserved an additional
shares of common stock for issuance under our new stock plans.

   This table also gives effect to an amendment to our charter filed after
March 31, 2000 that increased the number of shares of common stock and
preferred stock authorized for issuance.


                                      16
<PAGE>

                                   DILUTION

   Our pro forma net tangible book value as of March 31, 2000 was $   million,
or $    per share of common stock. We have calculated this amount by:

  .  subtracting our total liabilities from total tangible assets; and

  .  then dividing the difference by the total pro forma number of shares of
     common stock outstanding, including the number of shares of common stock
     that will be issued upon the automatic conversion of all convertible
     preferred stock upon the completion of this offering.

   If we give effect to our sale of     shares of common stock in this
offering at an assumed initial public offering price of $    per share, after
deducting the estimated underwriting discounts and commissions and the
estimated offering expenses payable by us, our adjusted pro forma net tangible
book value as of March 31, 2000 would have been $    million, or $    per
share. This amount represents an immediate dilution of $    per share to new
investors. The following table illustrates this per share dilution:

<TABLE>
<S>                                                                   <C>  <C>
Assumed initial public offering price per share......................      $
  Pro forma net tangible book value per share before this offering... $
  Increase in pro forma net tangible book value per share
   attributable to new investors.....................................
                                                                      ----
Pro forma net tangible book value per share after this offering......
                                                                           ----
Dilution per share to new investors..................................      $
                                                                           ====
</TABLE>

   The following table summarizes, as of March 31, 2000, after giving effect
to the conversion of the convertible preferred stock into common stock, the
difference between the number of shares of common stock purchased from us, the
total consideration paid to us, and the average price per share paid by
existing stockholders and by new investors, at an assumed initial public
offering price of $     per share before deducting estimated underwriting
discounts and commissions and estimated offering expenses payable by us:

<TABLE>
<CAPTION>
                                     Shares
                                   Purchased    Total Consideration     Average
                                 -------------- -----------------------  Price
                                 Number Percent   Amount     Percent   Per Share
                                 ------ ------- ------------ -------------------
<S>                              <C>    <C>     <C>          <C>       <C>
Existing stockholders...........              % $  3,191,576         %    $
New investors...................                                          $
                                  ----   -----  ------------  -------
  Total.........................         100.0% $               100.0%
                                  ====   =====  ============  =======
</TABLE>

   If the underwriters exercise their over-allotment option in full, the
number of shares held by new investors will increase to     shares, or   % of
the total shares of common stock outstanding after this offering, the number
of shares held by existing stockholders will be reduced to   % of the total
shares of common stock outstanding after this offering and the dilution to new
investors would increase to $   per share.

   The table above assumes no exercise of stock options outstanding on March
31, 2000. As of March 31, 2000, there were options outstanding to purchase
shares of common stock at a weighted average exercise price of $    per share.
To the extent any of these options are exercised, there will be further
dilution to new investors. To the extent all of these outstanding options had
been exercised as of March 31, 2000, pro forma net tangible book value per
share after this offering would have been $    and total dilution per share to
new investors would have been $   .

                                      17
<PAGE>

                     SELECTED CONSOLIDATED FINANCIAL DATA

   The following selected consolidated financial data should be read in
conjunction with our consolidated financial statements and the related notes
and "Management's Discussion and Analysis of Financial Condition and Results
of Operations" included elsewhere in this prospectus. The statement of
operations data for the years ended March 31, 1998, 1999, and 2000, and the
balance sheet data as of March 31, 1999 and 2000, are derived from, and are
qualified by reference to, our audited consolidated financial statements
included in this prospectus. The balance sheet data as of March 31, 1997 and
1998 is derived from our audited consolidated financial statements that are
not included in this prospectus. The statement of operations data for the year
ended March 31, 1996, and the balance sheet data as of March 31, 1996, are
derived from our unaudited consolidated financial statements that are not
included in this prospectus. The unaudited consolidated financial statements
have been prepared on the same basis as the audited consolidated financial
statements and, in the opinion of our management, include all adjustments,
consisting only of normal recurring adjustments, necessary for a fair
presentation of the information set forth therein. Historical results are not
necessarily indicative of results that may be expected for any future period.

<TABLE>
<CAPTION>
                                  Year Ended March 31,
                          ---------------------------------------
                           1996   1997   1998     1999     2000
                          ------ ------ -------  -------  -------
                                  (in thousands, except per share data)
<S>                       <C>    <C>    <C>      <C>      <C>     <C> <C> <C> <C>
Statement of Operations
 Data:
Revenues:
  Software licenses.....  $3,908 $5,596 $ 7,875  $ 6,715  $10,577
  Services..............   2,081  3,019   4,054    5,288    8,658
                          ------ ------ -------  -------  -------
    Total revenues......   5,989  8,615  11,929   12,003   19,235
                          ------ ------ -------  -------  -------
Cost of revenues:
  Software licenses.....      93    310     435      133      728
  Services..............     565    698     980    1,249    2,875
                          ------ ------ -------  -------  -------
    Total cost of
     revenues...........     658  1,008   1,415    1,382    3,603
                          ------ ------ -------  -------  -------
Gross profit............   5,331  7,607  10,514   10,621   15,632
Operating expenses:
  Research and
   development..........   1,809  2,055   3,190    4,850    5,696
  Sales and marketing...   1,788  2,228   3,398    4,056    7,510
  General and
   administrative.......     374    819   1,336    1,984    2,093
                          ------ ------ -------  -------  -------
    Total operating
     expenses...........   3,971  5,102   7,924   10,890   15,299
                          ------ ------ -------  -------  -------
Income (loss) from
 operations.............   1,360  2,505   2,590     (269)     333
Interest and other
 income.................      93     92     319      376      414
                          ------ ------ -------  -------  -------
Income before provision
 (benefit) for income
 taxes..................   1,453  2,597   2,909      107      747
Provision (benefit) for
 income taxes...........     581  1,105   1,134     (100)     172
                          ------ ------ -------  -------  -------
Net income..............     872  1,492   1,775      207      575
Accretion of transaction
 costs on redeemable
 convertible preferred
 stock..................     --     --       (9)     (14)    (14)
                          ------ ------ -------  -------  -------
Net income applicable to
 common shares..........  $  872 $1,492 $ 1,766  $   193  $   561
                          ====== ====== =======  =======  =======
Basic net income appli-
 cable per common
 share..................  $  .11 $  .19 $   .24  $   .03  $   .08
                          ====== ====== =======  =======  =======
Diluted net income per
 common share...........  $  .11 $  .19 $   .21  $   .02  $   .06
                          ====== ====== =======  =======  =======
Weighted average shares
 outstanding (basic)....   7,683  7,783   7,435    7,107    7,175
Weighted average shares
 outstanding (diluted)..   7,746  7,901   8,598    9,084    9,609
<CAPTION>
                                     As of March 31,
                          ---------------------------------------
                           1996   1997   1998     1999     2000
                          ------ ------ -------  -------  -------
                                       (in thousands)
<S>                       <C>    <C>    <C>      <C>      <C>     <C> <C> <C> <C>
Balance Sheet Data:
Cash and cash
 equivalents............  $1,358 $2,178 $ 7,227  $ 6,414  $ 8,765
Working capital ........   1,682  3,280   8,135    6,806    7,112
Total assets............   3,853  5,887  11,833   13,205   16,713
Redeemable convertible
 preferred stock........     --     --    6,920    6,934    6,948
Total stockholders'
 equity.................   2,584  4,077   2,480    2,737    3,468
</TABLE>

                                      18
<PAGE>

                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

   You should read the following discussion and analysis in conjunction with
our consolidated financial statements and the related notes included elsewhere
in this prospectus. This discussion and analysis contains forward-looking
statements that involve risks, uncertainties, and assumptions. Our actual
results may differ materially from those anticipated in these forward-looking
statements as a result of certain factors, including, but not limited to,
those set forth under "Risk Factors" and elsewhere in this prospectus.

Overview

   We provide predictive network management software products and related
services. Our product suite consists of three primary software products: OPNET
IT DecisionGuru, OPNET Modeler, and OPNET Netbiz. We sell our OPNET suite of
products to service providers, including telecommunications carriers, ISPs,
and ASPs, large and medium-sized organizations, and network equipment
manufacturers. We market our product suite in North America primarily through
a direct sales force and, to a lesser extent, several resellers and original
equipment manufacturers. Internationally, we market our products primarily
through third-party distributors.

   We sold our first products in 1987. Our operations have been financed
principally through cash provided by operations and a venture financing in
October 1997. In August 1998, we introduced our OPNET IT DecisionGuru and
OPNET Netbiz products and began a new marketing and sales strategy to focus on
these new products.

   We generate revenues principally from licensing our software products and
providing related services, including maintenance and technical support,
consulting, and training.

   Our software license revenues consist of license sales of our software
products and royalty income. Software license revenues are recognized upon
delivery, provided that fees are fixed and determinable, no significant
modifications to the product are required, and collection of the related
receivable is probable. Where significant modifications are required, software
license revenues are recognized along with consulting fees on a percentage-of-
completion basis as the modifications are performed. We allow customers to
evaluate our software before purchase, and therefore it is our policy not to
allow returns.

   Our service revenues consist of fees from maintenance and technical support
agreements, consulting services, and training. The maintenance agreements
covering our products provide for technical support and periodic product
upgrades. Revenues from maintenance and technical support agreements are
deferred and recognized ratably over the support period. We offer consulting
services primarily to provide product customization and enhancements.
Consulting services are generally performed under fixed-price agreements and
recognized as the work is performed on a percentage-of-completion basis. We
provide classroom and on-site training to our customers on a daily fee basis.

   Software license revenues and service revenues for which payment has been
received, but that do not yet qualify for recognition as revenues, are
reflected as deferred revenues.

   Revenues from sales outside of North America represented 31.8%, 29.3%, and
20.8% of our total revenues in the fiscal years ended March 31, 1998, 1999,
and 2000, respectively. Sales outside North America are primarily through our
third-party distributors, which are generally responsible for providing
technical support and service to customers within their territory. We expect
revenues from sales outside North America to continue to account for a
significant portion of our total revenues in the future.

                                      19
<PAGE>

   After our venture financing in October 1997, we implemented a plan to
diversify our product line and accelerated the development of our OPNET IT
DecisionGuru and OPNET Netbiz products. As a result, research and development
expenses increased significantly from fiscal 1998 to fiscal 1999. Also in the
quarter ended September 30, 1998, we began to increase our sales and marketing
staff to promote and sell our new products. Since that time, we have further
expanded our sales and marketing staff and expect to continue this expansion
to aggresively market our new products.

   In March 1999, we entered into a two-year non-renewable agreement with
Cadence Design Systems, when they decided to discontinue their product line,
that required us to make an aggregate payment of $1.0 million to Cadence and
requires us to pay to Cadence a 50% royalty on specified sales of OPNET
Modeler products sold to the portion of Cadence's customer base that use an
existing Cadence product. In the year ended March 31, 2000, we incurred
royalties to Cadence of $595,000, representing 5.6% of our software license
revenues for that period. We are amortizing the $1.0 million payment over the
two-year marketing support period under the agreement as part of sales and
marketing expenses, and we charge the royalty payments to cost of software
license revenues as the related revenue is recognized.

   At various dates during the year ended March 31, 2000, we granted options
to employees to purchase a total of            shares of common stock with
exercise prices below the estimated fair market value of the common stock at
the dates of grant. We recorded compensation expense of $36,000 for the year
ended March 31, 2000 resulting in a remaining deferred compensation balance of
$287,000 at March 31, 2000.

Results of Operations

   The following table sets forth items from our statements of operations
expressed as a percentage of total revenues for the periods indicated:

<TABLE>
<CAPTION>
                                                        Year Ended March 31,
                                                        ----------------------
                                                         1998    1999    2000
                                                        ------  ------  ------
<S>                                                     <C>     <C>     <C>
Revenues:
  Software licenses....................................   66.0%   55.9%   55.0%
  Services.............................................   34.0    44.1    45.0
                                                        ------  ------  ------
    Total revenues.....................................  100.0   100.0   100.0
                                                        ------  ------  ------
Cost of revenues:
  Software licenses....................................    3.6     1.1     3.8
  Services.............................................    8.2    10.4    14.9
                                                        ------  ------  ------
    Total cost of revenues.............................   11.8    11.5    18.7
                                                        ------  ------  ------
Gross profit...........................................   88.2    88.5    81.3
Operating expenses:
  Research and development.............................   26.7    40.4    29.6
  Sales and marketing..................................   28.5    33.8    39.1
  General and administrative...........................   11.2    16.5    10.9
                                                        ------  ------  ------
    Total operating expenses...........................   66.4    90.7    79.6
                                                        ------  ------  ------
Income (loss) from operations..........................   21.8    (2.2)    1.7
Interest and other income..............................    2.7     3.1     2.2
                                                        ------  ------  ------
Income before provision (benefit) for income taxes.....   24.5     0.9     3.9
Provision (benefit) for income taxes...................    9.5    (0.8)    0.9
                                                        ------  ------  ------
Net income.............................................   15.0%    1.7%    3.0%
                                                        ======  ======  ======
</TABLE>

                                      20
<PAGE>

   The following table sets forth, for each component of revenues, the cost of
these revenues as a percentage of the related revenues for the periods
indicated:

<TABLE>
<CAPTION>
                                                               Year Ended
                                                                March 31,
                                                            -------------------
                                                            1998   1999   2000
                                                            -----  -----  -----
<S>                                                         <C>    <C>    <C>
Cost of software license revenues..........................   5.5%   2.0%   6.9%
Cost of service revenues...................................  24.2   23.6   33.2
</TABLE>

 Comparison of Years Ended March 31, 1999 and 2000

   Revenues

   Total revenues increased 60.3% from $12.0 million for fiscal 1999 to
$19.2 million for fiscal 2000. We believe that the percentage increase in our
total revenues achieved in this period is not necessarily indicative of future
results. Software license revenues were 55.9% of total revenues for fiscal
1999 and 55.0% of total revenues for fiscal 2000.

   Software License Revenues. Software license revenues increased 57.5% from
$6.7 million for fiscal 1999 to $10.6 million for fiscal 2000. This increase
was primarily due to the substantial growth in overall demand for our
products, increased market acceptance of our OPNET IT DecisionGuru and OPNET
Netbiz products, which were introduced in August 1998, and increased revenues
generated through our indirect sales channels.

   Service Revenues. Service revenues increased 63.7% from $5.3 million for
fiscal 1999 to $8.7 million for fiscal 2000. This increase was primarily due
to a substantial increase in demand for consulting services, primarily for
customizing our OPNET Netbiz product, increased maintenance and technical
support contracts related to new license sales, increased renewals of these
contracts by our installed base of licenses, and increased training services.

   Cost of Revenues

   Cost of software license revenues consists primarily of royalties, media,
manuals, and distribution costs. Cost of service revenues consists primarily
of personnel-related costs in providing maintenance and technical support,
consulting, and training to customers. Gross margin on software license
revenues is substantially higher than gross margin on service revenues,
reflecting the low materials, packaging, and other costs of software products
compared with the relatively high personnel costs associated with providing
services. Cost of service revenues varies based upon the relative mix of
maintenance and technical support, consulting, and training services.

   Cost of Software License Revenues. Cost of software license revenues
increased 447.4% from $133,000 for fiscal 1999 to $728,000 for fiscal 2000.
Gross margin on software license revenues decreased from 98.0% for fiscal 1999
to 93.1% for fiscal 2000. This decrease in margin was primarily due to our
March 1999 agreement with Cadence that requires us to pay a 50% royalty for
specified sales of OPNET Modeler to the portion of Cadence's customer base
that uses an existing Cadence product. This agreement ends on March 31, 2001
and may continue to depress these margins through that date.

   Cost of Service Revenues. Cost of service revenues increased 130.2% from
$1.2 million for fiscal 1999 to $2.9 million for fiscal 2000. Gross margin on
service revenues decreased from 76.4% for fiscal 1999 to 66.8% for fiscal
2000. This decrease in margin was primarily due to an increase in the
proportion of consulting revenues, and to a lesser extent training revenues,
both of which require more personnel costs and provide lower gross margins
than our maintenance services.

   Operating Expenses

   Research and Development. Research and development expenses consist
primarily of salaries, related benefits, and other engineering related costs.
Research and development expenses increased 17.4% from $4.9 million for fiscal
1999 to $5.7 million for fiscal 2000. The increase was primarily related to
increased

                                      21
<PAGE>


research and development staffing levels for developing new products and
sustaining and upgrading existing products. As a percentage of total revenues,
research and development expenses decreased from 40.4% for fiscal 1999 to
29.6% for fiscal 2000. This decrease as a percentage of total revenues
resulted from a proportionally smaller increase in research and development
staffing levels relative to a higher level of revenues for fiscal 2000. The
small dollar increase was the result of a leveling of research and development
staff following a year of strong growth in headcount. We believe that a
significant level of research and development investment will be required to
maintain our competitive position, and expect that the dollar amount of these
expenditures will continue to grow in future periods.

   Sales and Marketing. Sales and marketing expenses consist primarily of
salaries and related benefits, commissions, user conference costs, tradeshows,
advertising, external consulting fees, and other costs associated with our
sales and marketing efforts. Sales and marketing expenses increased 85.2% from
$4.1 million for fiscal 1999 to $7.5 million for fiscal 2000. This increase
was primarily due to a substantial increase in the size of our direct sales
force, increased commissions associated with the growth in revenues, the
amortization of payments made in connection with our March 1999 agreement with
Cadence and a significant increase in the level of advertising, tradeshow, and
other marketing activities. As a percentage of total revenues, sales and
marketing expenses increased from 33.8% for fiscal 1999 to 39.1% for fiscal
2000. The increase as a percentage of total revenues was due to our additional
investment of resources associated with developing a market for our OPNET IT
DecisionGuru and OPNET Netbiz products, which were introduced in August 1998.
We intend to continue to expand our global sales and marketing infrastructure
and, accordingly, expect our sales and marketing expenses to increase in the
future.

   General and Administrative. General and administrative expenses consist
primarily of salaries, related benefits, and fees for recruiting, legal,
accounting, and other services. General and administrative expenses increased
5.5% from $2.0 million for fiscal 1999 to $2.1 million for fiscal 2000. The
increased level of spending was primarily due to additional personnel costs
and other expenses associated with our expansion of supporting infrastructure.
As a percentage of total revenues, general and administrative expenses
decreased from 16.5% for fiscal 1999 to 10.9% for fiscal 2000. We expect that
the dollar amount of general and administrative expenses will increase as we
expand our operations.

   Interest and Other Income

   Interest and other income increased 10.1% from $376,000 for fiscal 1999 to
$414,000 for fiscal 2000. Interest income increased 21.1% from $336,000 for
fiscal 1999 to $407,000 for fiscal 2000 as a result of more cash being
available for investment primarily from additional cash flow from operations
in fiscal 2000. Other income decreased 82.5% from $40,000 for fiscal 1999 to
$7,000 for fiscal 2000. Other income in fiscal 1999 was primarily related to
proceeds from an insurance settlement. We had no debt outstanding in either
period.

   Provision for Income Taxes

   The income tax benefit of $100,000 for fiscal 1999 resulted primarily from
research and development tax credits for which we qualified during the year.
The provision for income taxes for fiscal 2000 was $172,000. Our effective tax
rate for fiscal 2000 was 23.0%. This rate was relatively low due to research
and development tax credits available to us, and is likely to increase as our
earnings grow.

 Comparison of Years Ended March 31, 1998 and 1999

   Revenues

   Total revenues increased slightly from $11.9 million for fiscal 1998 to
$12.0 million for fiscal 1999. Fiscal 1999 was a transition year for us, with
the major emphasis early in the year placed on developing our OPNET IT
DecisionGuru and OPNET Netbiz products, which we introduced in August 1998. As
a result, software license revenues declined early in fiscal 1999 and grew
throughout the later months of that fiscal year as we introduced the new
products and increased our focus on sales and marketing for these products.

   Software License Revenues. Software license revenues decreased 14.7% from
$7.9 million for fiscal 1998 to $6.7 million for fiscal 1999. This decrease in
software license revenues was primarily due to our decision to

                                      22
<PAGE>

de-emphasize sales and marketing efforts for OPNET Modeler in order to focus
those efforts on OPNET IT DecisionGuru and OPNET Netbiz.

   Service Revenues. Service revenues increased 30.4% from $4.1 million for
fiscal 1998 to $5.3 million for fiscal 1999. This increase was primarily due
to substantial growth in consulting services related to the newly introduced
OPNET Netbiz product and, to a lesser extent, continued growth in maintenance
and technical support contracts from new and existing customers.

   Cost of Revenues

   Cost of Software License Revenues. Cost of software license revenues
decreased 69.4% from $435,000 for fiscal 1998 to $133,000 for fiscal 1999. The
decrease was primarily the result of lower product printing, packaging, and
distribution costs as we transitioned to electronic distribution for product
documentation, and, to a lesser extent, was also due to lower software license
revenues in fiscal 1999. As a result, cost of software license revenues as a
percentage of total license revenues decreased from 5.5% in fiscal 1998 to
2.0% in fiscal 1999. Gross margin on software license revenues was 94.5% in
fiscal 1998 and 98.0% in fiscal 1999.

   Cost of Service Revenues. Cost of service revenues increased 27.4% from
$980,000 for fiscal 1998 to $1.2 million for fiscal 1999. The increase was
primarily due to staffing additions in the consulting, training, and customer
support organizations, as the professional services organization increased
substantially during the course of fiscal 1999. The gross margin on services
was 75.8% for fiscal 1998 and 76.4% for fiscal 1999.

   Operating Expenses

   Research and Development. Research and development expenses increased 52.0%
from $3.2 million for fiscal 1998 to $4.9 million for fiscal 1999. This
increase was primarily due to the substantial addition of engineering staff
that was required to develop OPNET IT DecisionGuru and OPNET Netbiz and to
continue to develop new products as well as to upgrade and sustain existing
products. Technological feasibility for both OPNET IT DecisionGuru and OPNET
Netbiz was achieved in August 1998, the same time that we completed testing
the products and initiated their general release. As result of the substantial
increase in staffing, research and development expenses grew from 26.7% of
total revenues in fiscal 1998 to 40.4% of total revenues in fiscal 1999.

   Sales and Marketing. Sales and marketing expenses increased 19.4% from $3.4
million for fiscal 1998 to $4.1 million for fiscal 1999. This increase was
primarily due to an increase in the size of our sales force and an increased
level of marketing and advertising for introducing and selling our new
products, OPNET IT DecisionGuru and OPNET Netbiz. As a result of the increased
spending, sales and marketing expenses increased from 28.5% of total revenues
in fiscal 1998 to 33.8% of total revenues in fiscal 1999.

   General and Administrative. General and administrative expenses increased
48.5% from $1.3 million for fiscal 1998 to $2.0 million for fiscal 1999. The
increased level of spending was primarily due to additional personnel costs,
particularly in the finance department, recruiting costs for the growth in the
consulting services group, and other expenses associated with our expansion of
supporting infrastructure. As result of these spending increases, general and
administrative expenses increased from 11.2% of total revenues in fiscal 1998
to 16.5% of total revenues in fiscal 1999.

   Interest and Other Income

   Interest and other income increased 17.9% from $319,000 for fiscal 1998 to
$376,000 for fiscal 1999. Interest income increased 9.4% from $307,000 for
fiscal 1998 to $336,000 for fiscal 1999 as a result of more cash being
available for investment primarily from our venture financing in fiscal 1998.
Other income in fiscal 1999 was primarily related to proceeds from an
insurance settlement. We had no debt outstanding in either period.

   Provision for Income Taxes

   The provision for income taxes of $1.1 million for fiscal 1998 changed to a
benefit of $100,000 for fiscal 1999 and the effective tax rate decreased from
39.0% for fiscal 1998 to a benefit for fiscal 1999. Both of these reductions
were primarily due to lower income in fiscal 1999 and research and development
tax credits for which we qualified in both periods.

                                      23
<PAGE>

Quarterly Results of Operations

   The following table sets forth a summary of our quarterly operating results
for each of the last eight quarters. This information has been derived from
unaudited interim consolidated financial statements that, in the opinion of
our management, have been prepared on a basis consistent with the audited
consolidated financial statements contained elsewhere in this prospectus and
include all adjustments, consisting only of normal recurring adjustments,
necessary for a fair presentation of such information when read in conjunction
with our audited consolidated financial statements and the related notes. We
believe that period-to-period comparisons of our financial results are not
necessarily meaningful and should not be relied upon as an indication of
future performance.

<TABLE>
<CAPTION>
                                                       Quarter Ended
                          -------------------------------------------------------------------------
                          June 30,  Sep. 30,  Dec. 31, Mar. 31, June 30, Sep. 30, Dec. 31, Mar. 31,
                            1998      1998      1998     1999     1999     1999     1999     2000
                          --------  --------  -------- -------- -------- -------- -------- --------
                                                      (in thousands)
<S>                       <C>       <C>       <C>      <C>      <C>      <C>      <C>      <C>
Revenues:
 Software licenses......   $1,243    $1,621    $1,715   $2,136   $2,138   $2,447   $2,797   $3,195
 Services...............    1,083     1,279     1,407    1,519    1,792    1,969    2,308    2,589
                           ------    ------    ------   ------   ------   ------   ------   ------
 Total revenues.........    2,326     2,900     3,122    3,655    3,930    4,416    5,105    5,784
                           ------    ------    ------   ------   ------   ------   ------   ------
Cost of revenues:
 Software licenses......       34        44        35       20       69      201      204      254
 Services...............      290       281       284      394      545      742      762      826
                           ------    ------    ------   ------   ------   ------   ------   ------
 Total cost of
  revenues..............      324       325       319      414      614      943      966    1,080
                           ------    ------    ------   ------   ------   ------   ------   ------
Gross profit............    2,002     2,575     2,803    3,241    3,316    3,473    4,139    4,704
Operating expenses:
 Research and
  development...........    1,202     1,282     1,210    1,156    1,235    1,315    1,542    1,604
 Sales and marketing....      800     1,079       994    1,183    1,505    1,655    1,982    2,368
 General and
  administrative........      397       446       503      638      467      512      523      591
                           ------    ------    ------   ------   ------   ------   ------   ------
 Total operating
  expenses..............    2,399     2,807     2,707    2,977    3,207    3,482    4,047    4,563
                           ------    ------    ------   ------   ------   ------   ------   ------
Income (loss) from
 operations.............     (397)     (232)       96      264      109       (9)      92      141
Interest and other
 income.................      136        86        78       76       75       93      105      141
                           ------    ------    ------   ------   ------   ------   ------   ------
Income (loss) before
 provision (benefit) for
 income taxes...........     (261)     (146)      174      340      184       84      197      282
Provision (benefit) for
 income taxes...........     (142)      (97)       35      104       52       23       53       44
                           ------    ------    ------   ------   ------   ------   ------   ------
Net income (loss).......   $ (119)   $  (49)   $  139   $  236   $  132   $   61   $  144   $  238
                           ======    ======    ======   ======   ======   ======   ======   ======
<CAPTION>
                                            (as a percentage of total revenues)
<S>                       <C>       <C>       <C>      <C>      <C>      <C>      <C>      <C>
Revenues:
 Software licenses......     53.4%     55.9%     54.9%    58.4%    54.4%    55.4%    54.8%    55.2%
 Services...............     46.6      44.1      45.1     41.6     45.6     44.6     45.2     44.8
                           ------    ------    ------   ------   ------   ------   ------   ------
 Total revenues.........    100.0     100.0     100.0    100.0    100.0    100.0    100.0    100.0
                           ------    ------    ------   ------   ------   ------   ------   ------
Cost of revenues:
 Software licenses......      1.5       1.5       1.1      0.5      1.8      4.5      4.0      4.4
 Services...............     12.4       9.7       9.1     10.8     13.9     16.8     15.0     14.3
                           ------    ------    ------   ------   ------   ------   ------   ------
 Total cost of
  revenues..............     13.9      11.2      10.2     11.3     15.7     21.3     19.0     18.7
                           ------    ------    ------   ------   ------   ------   ------   ------
Gross profit............     86.1      88.8      89.8     88.7     84.3     78.7     81.0     81.3
Operating expenses:
 Research and
  development...........     51.7      44.2      38.8     31.6     31.4     29.8     30.2     27.7
 Sales and marketing....     34.4      37.2      31.8     32.4     38.3     37.5     38.8     41.0
 General and
  administrative........     17.1      15.4      16.1     17.5     11.9     11.6     10.3     10.2
                           ------    ------    ------   ------   ------   ------   ------   ------
 Total operating
  expenses..............    103.2      96.8      86.7     81.5     81.6     78.9     79.3     78.9
                           ------    ------    ------   ------   ------   ------   ------   ------
Income (loss) from
 operations.............    (17.1)     (8.0)      3.1      7.2      2.7     (0.2)     1.7      2.4
Interest and other
 income.................      5.9       3.0       2.5      2.1      2.0      2.1      2.1      2.4
                           ------    ------    ------   ------   ------   ------   ------   ------
Income (loss) before
 provision (benefit) for
 income taxes...........    (11.2)     (5.0)      5.6      9.3      4.7      1.9      3.8      4.8
Provision (benefit) for
 income taxes...........     (6.1)     (3.3)      1.1      2.8      1.3      0.5      1.0      0.7
                           ------    ------    ------   ------   ------   ------   ------   ------
Net income (loss).......     (5.1)%    (1.7)%     4.5%     6.5%     3.4%     1.4%     2.8%     4.1%
                           ======    ======    ======   ======   ======   ======   ======   ======
</TABLE>

   The trends discussed in the period comparisons above generally apply to the
results of operations for our eight most recent quarters, except for certain
differences discussed below.

                                      24
<PAGE>


   Our revenues from software licenses and services, as well as total
revenues, increased sequentially in each of the last seven consecutive
quarters.

   Cost of software license revenues has remained relatively constant from
quarter to quarter as a percentage of software license revenues except for the
quarters ended September 30, 1999, December 31, 1999, and March 31, 2000.
During those three quarters, we shipped products under our March 1999
agreement with Cadence, which required a 50% payment for sales to that portion
of the customer base of Cadence that uses an existing Cadence product. Cost of
service revenues as a percentage of service revenues has fluctuated as the mix
of services performed for customers varied between higher margin services,
such as maintenance, and lower margin services, such as consulting and
training.

   Total operating expenses have fluctuated primarily as a result of
variations in our sales and marketing expenses. In general, sales and
marketing expenses increased as a result of increasing the sales force and the
level of marketing and advertising, as well as the additional commissions
associated with revenue growth. In addition, beginning in the quarter ended
June 30, 1999, we began to amortize over a two-year period marketing support
rights we received under our March 1999 agreement with Cadence. To a lesser
extent, our operating expenses have fluctuated as a result of costs associated
with hiring staff and the use of outside consultants.

   We expect to experience significant fluctuations in future quarterly
operating results that may be caused by many factors including, among other
things:

  .  the timing of large orders;
  .  changes in the mix of our sales, including product sales requiring us to
     make royalty payments;
  .  the timing and amount of our expenses;
  .  the cost and time required to develop new software products;
  .  the acceptance of new products introduced by us or our competitors;
  .  changes in network technology or in applications;
  .  general economic conditions; and
  .  changes in our pricing policies or those of our competitors.

Due to these and other factors, our quarterly revenues and operating expenses
are difficult to forecast accurately.

Liquidity and Capital Resources

   Since inception, we have funded our operations primarily through cash
provided by operating activities. In October 1997, we raised $7.0 million in
venture financing, of which we used $3.4 million to repurchase stock from our
existing stockholders. As of March 31, 2000, we had cash, cash equivalents,
and short-term marketable securities totaling $8.8 million. We currently have
no debt facilities in place or any debt outstanding.

   Cash provided by operating activities was $2.3 million, $312,000, and $4.1
million for fiscal 1998, 1999, and 2000, respectively. Cash provided by
operating activities is primarily derived from net income, as adjusted for
depreciation and amortization, and increases in deferred revenue and accrued
liabilities. The cash provided by operations is generally used to fund the
increases in accounts receivable as a result of the growth in our business.

   Cash used in investing activities was $793,000, $1.2 million, and $1.9
million for fiscal 1998, 1999, and 2000, respectively. The funds were used
primarily to purchase property, equipment, and software. In fiscal 1999 and
fiscal 2000, these funds were also used to purchase marketing support rights
from Cadence.

   Cash provided by financing activities was $3.5 million for fiscal 1998.
This reflected the net proceeds from our $7.0 million venture financing, less
expenses and the $3.4 million used to repurchase common stock from our
existing stockholders. During fiscal 1999 and 2000, the cash provided by
financing activities was primarily derived from the sale of common stock and
from the exercise of stock options.

                                      25
<PAGE>

   We expect to experience growth in our working capital needs for the
foreseeable future in order to execute our business plan. We anticipate that
operating activities, as well as planned capital expenditures, will constitute
a material use of our cash resources. We are also currently reviewing our
space requirements and facilities needs and we anticipate leasing additional
office space, which will likely increase our facilities cost. In addition, we
may utilize cash resources to fund acquisitions or investments in
complementary businesses, technologies, or products.

   We believe that the net proceeds from this offering, together with our
current cash and cash equivalents and cash generated from operations, will be
sufficient to meet our anticipated cash requirements for working capital and
capital expenditures for at least the next 12 months. If we require additional
capital resources to grow our business, execute our operating plan, or acquire
complementary technologies or businesses at any time in the future, we may
seek to sell additional equity or debt securities, which may result in
additional dilution to our stockholders. If additional funding is required, we
cannot be certain that it will be available on acceptable terms, or at all.


Quantitative and Qualitative Disclosures About Market Risk

   We consider all highly liquid investments purchased with a maturity of
three months or less to be cash equivalents, and those with maturities greater
than three months are considered to be marketable securities. Cash equivalents
and marketable securities are stated at amortized cost plus accrued interest,
which approximates fair value. Cash equivalents and marketable securities
consist primarily of money instruments and U.S. Treasury bills. We currently
do not hedge interest rate exposure, but do not believe that an increase in
interest rates would have a material effect on the value of our marketable
securities.

Recently Issued Accounting Pronouncements

   In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Instruments
and Hedging Activities," which establishes accounting and reporting standards
for derivative instruments and hedging activities. As amended by Statement of
Financial Accounting Standards No. 137, this standard will be effective for us
for the fiscal years and quarters beginning after March 31, 2001, and requires
that an entity recognize all derivatives as either assets or liabilities in
the statement of financial position and measure those instruments at fair
value. We have not completed the process of evaluating the impact of this
statement and are therefore unable to disclose the potential impact that
implementing SFAS No. 133 will have on our financial position or results of
operations.

   In December 1999, the Securities and Exchange Commission issued Staff
Accounting Bulletin No. 101 Revenue Recognition in Financial Statements. This
SAB expresses the Commission's views on applying generally accepted accounting
principles to revenue recognition in financial statements. We do not expect
the application of this SAB to have a material impact on our financial
statements.

   In March 2000, the Financial Accounting Standards Board issued FASB
Interpretation No. 44, "Accounting for Certain Transactions Involving Stock
Compensation, an Interpretation of APB Opinion No. 25." With the exception of
certain provisions which required earlier application, this interpretation is
effective for all applicable transactions beginning July 1, 2000. We do not
expect that the adoption of this interpretation will have a material impact on
our financial statements.

                                      26
<PAGE>

                                   BUSINESS

Overview

   Our predictive network management software solutions enable our customers
to optimize the performance and maximize the availability of communications
networks and networked applications. The OPNET product suite combines
predictive simulation and a comprehensive understanding of network
technologies to enable network professionals to more effectively design and
deploy networks, diagnose network and application performance problems, and
predict the impact of proposed network modifications. Our OPNET product suite
consists of three primary software solutions: OPNET IT DecisionGuru for
service providers and enterprises, OPNET Modeler for network equipment
manufacturers, and OPNET Netbiz for service providers and network equipment
manufacturers. We believe our software solutions allow both users and
providers of networks to achieve higher levels of performance, and enhance the
return on investment from their networks and applications.

   We market our products to service providers, such as telecommunications
carriers, ISPs, and ASPs, large and medium-sized enterprises, and network
equipment manufacturers. Since inception, we have sold our products to over
500 customers, including service providers, such as AT&T, British Telecom, MCI
WorldCom, SBC Communications, Sprint, UUNET Technologies, and Vodafone
AirTouch; enterprises, such as Boeing, IBM, National Semiconductor, RR
Donnelley, and Texas Utilities; and network equipment manufacturers, such as
3Com, Cisco Systems, Ericsson, Motorola, Nokia, and Nortel Networks.

Industry Background

   Growth and Increased Complexity of Networks

   Organizations are becoming increasingly reliant upon their communications
networks and networked applications to successfully execute their business
strategies. The increasing use of business applications, such as enterprise
resource planning, corporate intranets, online transaction processing, e-mail,
and streaming multimedia, has expanded the amount of network traffic within
organizations, and has resulted in significant growth in underlying network
infrastructures. In addition, the proliferation and widespread adoption of the
Internet has expanded the role of networks beyond organizational boundaries,
and these networks now represent the fundamental infrastructure for the
electronic conduct of business, known as e-business or e-commerce.
International Data Corporation, or IDC, estimates the number of Internet e-
commerce users worldwide will grow from 142 million in 1998 to over 502
million in 2003. In addition, IDC estimates e-commerce will grow from $50
billion in 1998 to more than $1.3 trillion in 2003. As a result, most
organizations are recognizing that managing the growth and operation of their
communications networks is critical to their business operations.

   To support the rapidly expanding size and scope of communication
requirements, network infrastructures have been developed based on a wide
range of equipment, technologies, protocols, and network services. As a
result, the operation of these networks is becoming increasingly complex.
Service providers and enterprises must now manage the convergence of voice,
data, and video traffic over wireline and wireless architectures by
integrating numerous existing and emerging technologies. These technologies
include Asynchronous Transfer Mode, or ATM, Internet Protocol, or IP, Voice
over IP, IP Quality of Service, or IP-QoS, Multi-Protocol Label Switching, or
MPLS, Frame Relay, Synchronous Optical Network, or SONET, Code Division
Multiple Access, or CDMA, Digital Subscriber Line, or DSL, and data over
cable. IDC estimates that the installed base of networked PCs worldwide will
grow from 232 million in 1998 to 577 million in 2003. In addition, network
data traffic is expected to grow rapidly. Pioneer Consulting, LLC estimates
that peak-hour U.S. Internet bandwidth demand will grow from .33 terabits per
second in 1999 to 17.9 terabits per second in 2004, representing a 122%
compound annual growth rate. The growth of networks, network complexity, and
network data traffic has forced organizations to confront significant
challenges in the efficient and cost-effective management of networks and
applications.

   Today, communications networks are sophisticated, dynamic systems that
evolve on a daily basis. The rate of network and traffic growth is challenging
the ability of organizations to meet required service levels upon which
critical business applications and operations rely. Constant evaluation of and
improvements to the network are essential to maintaining business and
application performance. However, since modifications to the network and its
traffic have the potential to result in network failures or service level
degradation, network

                                      27
<PAGE>

professionals need to plan and implement network changes in a controlled
manner, taking into account the potential consequences of their actions.

   Inadequacy of Traditional Network Management Solutions

   As the complexity of networks continues to increase, so does the need for
sophisticated solutions to manage network resources effectively. GartnerGroup
estimates that the overall market for network management software and
application performance and availability management software will grow from
$3.6 billion in 1999 to $7.1 billion in 2003. To date, network management
systems have primarily played a reporting role. These systems typically
collect, store, and analyze data about the traffic on the network, the status
and performance of network devices and links, and the availability of network
services and applications. While these traditional network management
solutions play an important role in managing networks, they are limited by
their focus on reporting past and present information. As a result, these
solutions are primarily reactive to events occurring within the network.

   Reactive network management solutions do not adequately support key network
management functions, including network design and deployment, applications
deployment, capacity planning, contingency planning, traffic engineering,
budgeting, and deployment of network policies. This is because traditional
network management products provide limited insight into how network resources
will perform in response to future events. In general, the support for future
planning provided by reactive network management products is limited to trend
analysis and simple projections as to when key network and system resources
will become overloaded. Traditional solutions are not able to forecast the
impact of important changes that frequently occur in networks, such as traffic
growth, failure of network components, adoption of new networking
technologies, and reorganization of network assets. In addition, these
solutions do not generally take into account the network as a whole, the
interaction among network components, and the complex behaviors that are
inherent to modern networks.

   Market Opportunity

   To remain competitive, organizations must deal with increased complexity,
rapid growth, and continuous change in their communications networks. At the
same time, every change to the network environment introduces the potential
for performance degradation or system failures, and therefore, business
interruptions and lost revenue. As a result, organizations need predictive
network management solutions that allow them to evaluate network and
application performance in future scenarios. A predictive capability allows
network professionals not only to test network and application performance
under a wide range of operating conditions, but also to determine which
network technologies are best suited to ultimately solve business problems.
Business executives and network professionals need a comprehensive network
management solution that allows them to design and deploy networks and
implement network changes that:


  .  optimize overall system performance;

  .  maximize system availability;

  .  leverage emerging communications and networking technologies;

  .  ensure service levels are met for business-critical applications; and

  .  proactively manage network growth, complexity, and costs.

The OPNET Solution

   Our suite of products represents the next generation of software solutions
that advances network and application management beyond reactive problem
identification and reporting to proactive problem resolution and avoidance. By
combining predictive simulation with a comprehensive understanding of network
technologies, the OPNET product suite enables network professionals to more
effectively design and deploy networks, predict the impact of proposed network
modifications, and diagnose network and application performance problems. The

                                      28
<PAGE>


ability of our products to accurately model and simulate network and
application performance is also valuable in the design and testing of new
network equipment and technologies and is an effective sales tool for
professionals who design and deploy networks. We believe that our software
products provide the following benefits to our customers:

  Reduced Network Operating Risks

   Our products enable our customers to more effectively manage the risks
associated with the necessary implementation of network upgrades and new
services by helping network managers evaluate which measures can be taken to
minimize potential network disruptions and maintain required service levels.
For example, an enterprise deploying a new application on its network can use
our products to determine if the performance of the application will meet
prescribed service levels and to what extent the network traffic generated by
the new application will compromise the service levels of existing
applications on the network. Service providers can use our products as part of
their overall planning process to minimize the risk that growth in their
subscriber base or restructuring of their network infrastructure will
jeopardize the availability or performance of their services.

  Increased Productivity and Competitiveness

   By using our products, network managers and application deployment teams
can gain greater control over the performance of business applications that
are critical to employee productivity and the competitiveness of the business.
Our products enable network professionals to diagnose and resolve application
performance problems that can prevent employees from carrying out essential
business tasks. In addition, our products support informed decision-making and
planning for network infrastructures that carry vital business data, including
e-commerce and e-business transactions. Our products also enable network
equipment manufacturers to test their equipment, technologies, and protocols
more thoroughly, while considering a wider range of alternative designs,
resulting in more robust networking products and faster introduction of
products to the marketplace.

  Reduced Network Operating Costs

   Our OPNET suite of products enables our customers to better determine the
appropriate financial commitments that should be made for network resources,
including bandwidth, advanced network technologies, and network hardware.
Using our products, network managers and planners can compare relative
benefits of alternative technologies and network designs, and weigh these
benefits in relation to the corresponding operational costs. Our products also
provide organizations that operate networks the ability to determine
achievable service levels and to understand whether network changes will
render service levels unacceptable. By proactively managing service levels,
these organizations are better able to reduce service level agreement
violations that may require paying costly penalties to their clients.
Additionally, these organizations are able to reduce costs caused by network
interruptions.

  New Revenue Opportunities

   The increasing complexity and scale of networks is creating challenges for
organizations that sell network equipment and network services. Our products
help the sales forces of these organizations to automate the network design
and proposal process and create competitive and consistent proposals, thereby
streamlining the sales cycle. This allows sales representatives to focus on a
greater number of sales opportunities. Additionally, our customers' sales
forces can leverage the predictive capabilities of our products to demonstrate
the performance of the proposed network design or network service prior to
deployment. We believe that these features allow our customers to
differentiate themselves from their competitors and enable the purchasers of
network equipment and services to make better informed and quicker buying
decisions.

  Improved Customer Satisfaction

   Our products improve satisfaction of network end users by enabling our
customers, which are the providers of network services and technologies, to
proactively manage and improve the quality and performance of their offerings.
By using our products' predictive capabilities, service providers can ensure
that adequate measures are

                                      29
<PAGE>

taken to maintain the availability and performance of their services to their
clients over networks experiencing rapid traffic growth and the introduction
of changing technologies. For example, an ASP can use our software to uncover
the primary factors that can contribute to the poor performance of an
application and then determine the preferred approach to improving the
application's performance.

Strategy

   Our objective is to enhance our leadership position in the market for
predictive network management software solutions. To achieve this goal, we are
pursuing the following strategies:

  Increase Penetration Within the Service Provider Market

   We believe that we can achieve significant additional penetration within
the service provider marketplace, which includes telecommunications carriers,
ISPs, and ASPs, by creating extensions to our existing software products to
address their specific network management needs. We also intend to focus
additional sales resources on service provider accounts and adopt service
provider-specific price structures that scale with the size of managed
networks. We expect to increase sales within this market by leveraging
relationships with our network equipment manufacturer customers, including
Cisco Systems and FORE Systems, recently acquired by Marconi, which sell
hardware to service providers, through a combination of reselling, referrals,
and joint marketing arrangements.

  Expand Direct Sales Channel

   We believe that there is significant untapped demand for our software
products and we plan to meet this demand by increasing the number of our
direct sales representatives. We currently employ 20 direct sales
representatives in the United States and expect to expand our sales team by
aggressively hiring qualified sales representatives. We intend to continue to
invest significant marketing and sales resources to support our direct sales
channel and intend to increase market awareness by expanding our advertising,
trade shows, direct marketing, customer seminars, and other marketing efforts.

  Expand Global Sales Efforts

   Our international sales activities are currently conducted by our
distributors that resell only OPNET Modeler in France, Germany, Scandinavia,
the United Kingdom, the Middle East, India, Pakistan, Australia, China, Japan,
Korea, and Singapore. We intend to accelerate the growth of our international
sales both by increasing the number of international distributors and by
enabling and training our current and new distributors to sell the entire
OPNET suite of products. We also intend to focus technical sales resources on
strengthening our distributors' sales, marketing, and training programs. We
intend to establish technical sales support centers in selected regions.

  Leverage our Existing Customer Base

   We currently have an installed base of over 500 customers that we believe
provides us with significant opportunities for additional sales of our current
and future products. We have successfully expanded license revenues within
many customer organizations by selling additional licenses for the same
products as well as complementary products from the OPNET product suite, and
we believe additional opportunities exist for these types of sales. In
addition, our solutions are built on a modular, flexible architecture, which
allows us to deliver new functionality to our customers in the form of product
modules and model libraries designed to work with our existing products. We
intend to continue to develop focused sales programs that will leverage our
new offerings, as well as the goodwill we have established, to increase
revenue from our existing customer base.

  Further Extend Technology and Product Leadership

   We believe that our OPNET suite of products is the most comprehensive
predictive network management software solution currently available. We intend
to maintain our product and technology leadership by enhancing the
functionality of existing products and introducing new products through
internal research and development and, potentially, through acquisition of
technologies or businesses. We plan to enhance our products with additional
capabilities, including additional interfaces to the operational network
environment; an expanded library of existing and emerging network protocols,
applications, and communications standards; and additional network service and
equipment cost/benefit analysis features.

                                      30
<PAGE>


   Develop Additional Strategic Relationships

   We have created marketing programs to sell our software to professional
services organizations, including Andersen Consulting, PricewaterhouseCoopers,
Entex, and Enterprise Networking Systems, and to provide them with the support
and information they need to maximize their success using our products. These
programs facilitate our access to the large number of organizations which
outsource information technology and networking services. Although none of
these organizations has accounted for a material portion of our revenues to
date, we expect this strategy to lead to increased sales of our products, not
only among our professional services customers, but also among their clients.
We also have technology relationships with other network management software
vendors, including Hewlett-Packard, Agilent Technologies, Marconi, Tivoli
Systems, Concord Communications, and NetScout Systems, and expect to continue
to develop other technology relationships, as well as to pursue joint
marketing and selling opportunities of our complementary solutions. To date
none of these vendors has accounted for a material portion of our revenues.

Products

   Our products use predictive simulation technology to support the assessment
of future network and application performance under a wide range of operating
conditions. Our products include model libraries that permit the simulation
and analysis of major network technologies and communication protocols, such
as Transmission Control Protocol/Internet Protocol, or TCP/IP, IP-QoS, Voice
over IP, SONET, CDMA, Virtual Local Area Networks, or VLANs, Frame Relay, IP
compression, data over cable, and ATM. We sell both off-the-shelf and
customized products that offer interfaces to traditional network management
systems and popular integration platforms, such as HP OpenView Network Node
Manager, Tivoli NetView, NetScout Systems Manager Plus, and Oracle database
products. The following chart summarizes our OPNET product suite:


<TABLE>
<CAPTION>
  Product               Description                Target Customers
- -------------------------------------------------------------------------------
  <C>                   <S>                        <C>
  OPNET IT DecisionGuru Enables users to predict   Service providers and enterprises
                        the performance of
                        networks and
                        applications


- -------------------------------------------------------------------------------
  OPNET Modeler         Enables designers to       Network equipment manufacturers
                        evaluate how complex
                        networking equipment,
                        technologies, and
                        protocols will perform
                        under simulated network
                        conditions


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

  OPNET Netbiz          Facilitates and            Service providers and network
                        accelerates the sales      equipment manufacturers
                        process by automating
                        network design and
                        proposal generation


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

  OPNET Modules         Provide enhanced           Entire customer base
                        functionality for our
                        primary software
                        products


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

  OPNET Model Libraries Libraries of models that   Entire customer base
                        simulate the behavior of
                        networking technologies
                        and communication
                        protocols
</TABLE>

   OPNET IT DecisionGuru

   We began commercial distribution of OPNET IT DecisionGuru in August 1998.
OPNET IT DecisionGuru uses our predictive simulation and modeling technology,
which combines software models of network components, protocols, and
applications into a single overall model, in order to forecast many aspects of
network behavior. This capability enables service providers and enterprises to
predict the performance of their networks and applications under a wide range
of potential scenarios. OPNET IT DecisionGuru allows users to make comparisons
among alternative approaches to managing the evolution of their networks and
managing change within their networks, such as adopting new technologies,
increasing capacity, and reorganizing assets. OPNET

                                      31
<PAGE>


IT DecisionGuru also provides detailed views of an application's performance
within a network. This enables network managers and application deployment
teams to understand the impact of implementing a new application on existing
applications, as well as the ability of a network to support the resulting
traffic. OPNET IT DecisionGuru supports many popular communication protocols
and networking technologies that operate within wireline and wireless
networks.

   OPNET Modeler

   OPNET Modeler was our first product and was introduced in 1987. OPNET
Modeler uses our device and protocol design environment, as well as our
predictive simulation technology, to enable our customers to build software
models of a broad range of network devices, communication protocols, and
applications, and to combine these models to run simulations in order to
predict network behavior and performance. These capabilities support the
design, modeling, and development of network equipment and protocols. OPNET
Modeler enables network equipment manufacturers to test product designs in a
wide variety of scenarios prior to manufacturing. Using OPNET Modeler, network
technology and equipment designers gain a better understanding of design
tradeoffs earlier in the product development process, reducing the need for
time-intensive and expensive hardware prototyping.

   OPNET Netbiz

   We began commercial distribution of OPNET Netbiz in August 1998. OPNET
Netbiz is designed to facilitate and accelerate the sales processes of service
providers and network equipment manufacturers. OPNET Netbiz enables our
customers' sales forces to quickly and automatically generate network service
and equipment proposals based on their clients' requirements by using advanced
network design techniques. OPNET Netbiz can interface with our customers'
applications for order processing, work-order generation, and provisioning.
OPNET Netbiz is Web-enabled to allow our customers' clients to create network
designs over the Internet prior to purchasing services and products.

   OPNET Modules

   We develop and sell a variety of software modules that provide enhanced
functionality to OPNET IT DecisionGuru, OPNET Modeler, and OPNET Netbiz.
Currently available OPNET modules include:

  . Application Characterization Environment, for analyzing, diagnosing, and
    simulating the performance of applications within a network based on
    network traffic samples;

  . Multi-Vendor Import, for importing network infrastructure and traffic
    information from other network management software applications;

  . Expert Service Prediction, for the definition and compliance testing of
    service level agreements;

  . Radio and Terrain Modeling, for modeling wireless networks and the
    effects of terrain on those networks; and

  . ERP NetworkGuru for SAP R/3, for the planning and analysis of SAP
    application deployments, their effect on the network, and their ability
    to perform effectively within an existing network environment.

   OPNET Model Libraries

   The model libraries are used by OPNET IT DecisionGuru and OPNET Modeler to
simulate and analyze major networking technologies and communication
protocols. These libraries provide the building blocks used to generate models
of networks. OPNET IT DecisionGuru and OPNET Modeler include extensive
libraries of popular and emerging networking technologies and communication
protocols, such as TCP/IP, hypertext transfer protocol, or HTTP, Open Shortest
Path First routing, or OSPF, ATM, frame relay, and IP-QoS. Some of our model
libraries are included in our base products and others are available for an
additional fee.


                                      32
<PAGE>

Technology

   Our technologies for modeling, designing, visualizing, and simulating
networks are based on extensive research and development efforts carried out
over the past 13 years. The following diagram summarizes the essential
components of our products:






[graphic appearing on p. 33]

The center and left side of this apce contains a flowchart captioned OPNET
Modeler. This flowchart contains three columns of large icons, the center and
right columns of which are contained within a flowchart captioned OPNET IT
DecisionGuru. A large icon captioned Device/Protocol Design Environment
appears in the left column; an arrow leads to a large icon in the center
column captioned Model Libraries (which has attached to it small icons
captioned Wireless Modeling and Parallel Simulation); an arrow leads to a
large icon below captioned Performance Analysis and Reporting Engine (which
has attached to it a small icon captioned Expert Service Prediction). The
right column in this flowchart has a large icon captioned Network and Traffic
Import Engine (which has attached ot it small icons captioned MVI and ACE); an
arrow leads to a lrge icon below captioned Network Object Store & Visualizer:
design and analysis environment (this icon is also linked by arrows to the
Simulation Engine, Performance Analysis and Reporting Engine, and OPNET
Integration Platform icons).

The right side of this space contains a flowchart depicting OPNET Netbiz. Icon
captioned Product Data and Configuration and Design Rules are linked to an
icon captioned OPNET Integration Platform (which, in turn, contains icons
captioned Customized Workflow for Network Design (web-enabled) and Customized
Reporting (Proposals, bills of materials, and work orders)). The margin of
this flowchart extends to the left to enclose the icon noted above captioned
Network Object Store & Visualizer.

Below the above-
described graphics is a legend noting the symbols representing
Databse and Module, as well as the acronyms MVI: Multi-Vendor Import and ACE:
Application Characterization Environment.

   OPNET Modeler serves as a foundation for our other products, providing the
broadest array of functionality. OPNET IT DecisionGuru and OPNET Netbiz
represent progressively easier to use products, with functionality designed to
address specific business needs. All of the primary products within the OPNET
product suite use a significant amount of shared core software, allowing us to
create new products more efficiently and to foster the interoperability of our
products.

  Simulation Engine

   A key capability of OPNET IT DecisionGuru and OPNET Modeler is the ability
to perform detailed simulations of networks in order to understand how they
will perform in a wide range of scenarios. The core support for this
capability is provided by the simulation engine, which sequences a network
model through a series of events, representing activity within the network.
The simulation engine has been designed to be highly efficient and scalable,
in order to support simulations of large networks that transport substantial
volumes of network traffic. We have developed and are testing a parallel
simulation module that will augment the simulation engine to provide support
for running simulations on computers with multiple processors in order to
enhance simulation speed. Currently, this module is designed only for
simulation of wireless networks but we plan to extend this capability to other
types of networks in the future.

                                      33
<PAGE>


   Model Libraries

   A network model consists of software objects that correspond to the
devices, computers, and links that constitute the actual network of interest.
The behavior of these objects is controlled by models of devices, computers,
applications, communication protocols, and links. Many network devices are
highly complex, incorporating the functionality of several dozen communication
protocol models and application models. These communication protocol models
and application models are provided in OPNET's model libraries, which consist
of a broad range of models that represent the behavior of standard and popular
communication protocols, applications, and networking technologies. The models
within the OPNET model libraries are based on a variety of information
sources, including standards documents, industry literature, publicly
available source code, input from our network equipment manufacturer
customers, and tests performed in a laboratory environment. These models
simulate many essential characteristics of the actual network components and
interact with each other within the context of a discrete-event simulation, in
order to predict the behavior and performance of an overall network. Many of
our models also can perform hybrid simulation, a novel technique that we
developed, which combines discrete-event simulation with sequences of fast
computations and mathematical calculations to accelerate simulation run times.

   Our model libraries are developed and maintained using OPNET Modeler.
Customers who use OPNET Modeler frequently create extensions to the models
that we provide, as well as develop entirely new models to represent emerging
protocol standards, unique applications and protocols, or legacy systems that
are not yet included in our libraries. Users may share their models with each
other, either directly or through an on-line database that is accessible over
the Internet.

   Network Object Store and Visualizer

   The network object store contains the essential network information which
is used by each of our products. OPNET software represents networks as a
collection of data objects, each of which corresponds to a network component,
such as a network device, a communications link, or a computer. OPNET software
organizes these data objects into the network object store for each network of
interest. The network visualizer provides a graphical user interface for
viewing, modifying, or configuring the network represented in the network
object store.

   Network and Traffic Import Engine

   Our product suite provides interfaces to other network management software
so that our customers can leverage information collected by those
applications. Network and traffic import is currently based on the Application
Characterization Environment and the Multi-Vendor Import Module. These modules
allow our customers to import information about how a network is constructed
and the patterns of the traffic that flows through the network. This
information forms a model of a network as it is currently built and operating.
Modifications and extensions to the network and traffic model can then be
performed within the OPNET software to study the impact of proposed or
anticipated changes. Our OPNET software currently provides the ability to
import information from HP OpenView Network Node Manager, Tivoli NetView,
NetScout Systems Manager Plus, Agilent NetMetrix, Network Associates Sniffer
Network Analyzer, and other network analyzer products. We intend to develop
additional interfaces to other popular network management software products to
broaden our customers' ability to generate models of their networks
automatically.

   Device and Protocol Design Environment

   OPNET Modeler provides a design environment to define models of network
devices, protocols, and applications. These models can then be used as
building blocks for modeling entire networks, or portions of networks, in
order to proactively manage performance. The device and protocol design
editors are used primarily by network equipment manufacturers, network
industry researchers, and our own staff to develop libraries containing models
of major network technologies.


                                      34
<PAGE>


   Performance Analysis and Reporting Engine

   As a network simulation runs, the elements of the network model record
information about their performance and behavior, in the same way probes or
traditional management systems record and report vital performance statistics
of actual networks. Performance statistics of interest to network managers
include the response times experienced by users of applications, the
utilization of communication links, and the number of connections that failed
to be established over the network. Our software selects, aggregates,
processes, and presents statistics in the form of graphs, charts, service
level agreement exception reports, and animations. Graphs, charts, and service
level agreement exceptions can be viewed within the OPNET software products or
through a standard Web browser.

   Wireless Modeling Infrastructure

   Our software provides wireless network modeling and simulation capabilities
based on the Radio Module and the Terrain Modeling Module. Using these
modules, our users are able to predict and analyze the performance of
applications and communication protocols running over wireless and combined
wireline/wireless infrastructures, taking into account complex factors that
are inherent to wireless environments, including intermittent availability of
links, radio interference, terrain effects, and time-varying signal strength
for mobile devices.

   OPNET Integration Platform

   The OPNET integration platform allows our customers to develop tailored
applications. The OPNET integration platform is a collection of software
modules that provides developers the capability to rapidly create user
interfaces, workflows, visualizations, and reports, to form a comprehensive
network design and analysis solution that meets unique customer requirements.
The OPNET integration platform is specifically designed to incorporate
knowledge of networking concepts, which allows developers to focus on the
aspects of the application that reflect their proprietary product lines,
business practices, and design configuration rules.


                                      35
<PAGE>

Customers

   We have licensed our software to over 500 organizations worldwide. Our
customers include:

  . service providers, including telecommunications carriers and ISPs;

  . large and medium-sized enterprises that rely on networks to conduct
    business, including organizations that provide consulting for the
    planning, design, and troubleshooting of networks; and

  . network equipment manufacturers.

   The following is a representative list of organizations that have licensed
at least $50,000 of our software:


<TABLE>

                               Service Providers
<S>                       <C>                        <C>
 AT&T                     Deutsche Telekom           Sprint
 AT&T Wireless            France Telecom             Teledesic
 Belgacom                 Inmarsat                   Telia
 Bell Atlantic            INTELSAT                   Telstra
 Bell Canada              Korea Telecom              US West
 British Telecom          MCI WorldCom               UUNET Technologies
 Comsat                   SBC Communications         Vodafone AirTouch

                                  Enterprises

 Abbott Laboratories      Daimler-Benz               NetEffect
 Aerospatiale Matra       DIRECTV                    Oracle
 Andersen Consulting      Entergy                    RR Donnelley
 Baker Hughes             IBM                        SAP
 Boeing                   Internal Revenue Service   Spiegel
 CACI Federal             NASA                       Texas Utilities
 DaimlerChrysler          National Semiconductor


                        Network Equipment Manufacturers

 3Com                     GTE                        Nokia
 Advanced Micro Devices   Hewlett-Packard            Nortel Networks
 Alcatel                  Hughes Electronics         Philips Electronics
 Ascom                    Intel                      QUALCOMM
 CableLabs                ITT Industries             Raytheon
 Cisco Systems            Lockheed Martin            Rockwell
 E-Systems                Lucent Technologies        Scientific Atlanta
 Ericsson                 Matsushita Electric        Siemens
 FORE Systems             Industrial                 ST Microelectronics
 Fujitsu                  Motorola                   Toshiba
 GEC Marconi Avionics     NEC                        TRW
 General Instruments      Network Equipment
                          Technologies
                          Newbridge Networks
</TABLE>


  Historically, our software license agreements generally have provided our
customers with a perpetual license for the use of our software by a specified
number of concurrent users. In the future, we intend to pursue a licensing
model in which more of our licenses require annual renewal payments from our
customers.

   For the year ended March 31, 2000, we generated 20.8% of our total revenues
from customers located outside North America. No single customer accounted for
more than 10% of our total revenues in any of the last three fiscal years. Note
12 to our financial statements presents information regarding revenues
generated in the United States and internationally.


                                       36
<PAGE>


   The following example shows how one of our customers uses our products:

  Cisco Systems

   The Challenge. Cisco Systems is a leading provider of networking equipment
and solutions. Because of the rapid pace at which new technology is emerging,
Cisco Systems desired software solutions to quickly demonstrate and quantify
the impact and value of new technologies for service providers.

   The Solution. OPNET Modeler and OPNET IT DecisionGuru are being used by
Cisco Systems to shorten development cycles and deliver its New World hardware
to ISPs faster and more cost-effectively. OPNET Modeler accelerates the
development process by providing a simulated environment for testing protocols
and hardware designs, allowing Cisco Systems to test protocol behavior and
simulate traffic flow in a wide range of scenarios that closely mirror real-
world ISP infrastructures. In addition, OPNET IT DecisionGuru's virtual
proving ground quickly and efficiently demonstrates the value of Cisco
Systems-based networks to ISPs.

Sales and Marketing

   We sell our software through our direct sales force, our international
distributors, and a number of original equipment manufacturers and resellers.
We have marketing relationships with original equipment manufacturers Hewlett-
Packard and Agilent Technologies. To date, neither of these original equipment
manufacturers has accounted for a material portion of our revenues. In North
America, the majority of our sales are made by our direct sales force. As of
April 30, 2000, our sales and marketing organization consisted of 51 employees
located in our headquarters in Washington, D.C., and our offices in Boston,
Dallas, and Santa Clara. We intend to expand our sales and marketing
organization through aggressive recruiting of qualified individuals.

   Our direct sales force is organized into two primary groups; one group
focuses on selling OPNET IT DecisionGuru and OPNET Netbiz to our service
provider and enterprise customers as well as OPNET Netbiz to our network
equipment manufacturer customers, and the other group focuses on selling OPNET
Modeler to our network equipment manufacturer customers. Our international
sales activities are primarily conducted by our 10 distributors that resell
OPNET Modeler in France, Germany, Scandinavia, the United Kingdom, the Middle
East, India, Pakistan, Australia, China, Japan, Korea, and Singapore.
International sales activities are managed by our vice president of marketing
and international business development. In addition, we intend to establish
technical sales support centers in some of our markets in order to better
support our distributors.

   We engage in marketing activities to increase awareness of our products
among our potential customer base and to create sources of leads for our sales
organization. Our marketing activities include:

  . participation in networking industry tradeshows;

  . seminars that introduce the capabilities of our software to potential
    customers;

  . seminars designed specifically for organizations that are already our
    customers, but present significant potential for additional license
    sales;

  . advertisement in trade journals and networking-oriented Web sites;

  . direct mailings to potential customers;

  . product briefings with industry analysts; and

  . a variety of public relations activities, including our annual
    international user conference.


                                      37
<PAGE>

   For each of the last three years, we have sponsored OPNETWORK, an annual
international user conference convened in Washington, D.C. that focuses on
predictive network management for professionals in all areas of networking and
information technology. OPNETWORK '99, held in August 1999, included more than
290 hours of presentations and more than 60 guest speakers. Over 500 people
attended OPNETWORK '99, representing a 65% increase from the previous year.

Service and Support

   Our service and support offerings include:

  . consulting and customization services;

  . software maintenance, which includes providing software updates for major
    and minor revisions;

  . technical support by telephone, e-mail, or fax; and

  . training, which includes courses that enable our customers to more
    effectively use our products.

   We offer consulting services to assist our clients in customizing their
OPNET products. In particular, our customers typically buy customization
services with their purchase of OPNET Netbiz. Customization services are
performed by our consulting staff, which consists of software development
engineers, quality assurance engineers, technical documentation specialists,
and product managers. Some customers also choose to engage our consulting
services in proactive network management projects, including network planning,
network design, diagnosis of network performance problems, and communication
protocol design.

   Software maintenance and technical support are purchased by our customers
as a single package, generally on an annual basis. Purchasers of these
services are provided with updates to the software they license from us as the
updates are released. The fee for this service is generally determined as a
percentage of the current price of product licenses.

   We provide customer support from our support center at our headquarters in
Washington, D.C. Our technical support services are supported by a
comprehensive information system that ensures that customer inquiries are
addressed promptly, tracked until fully resolved, and recorded for future
reference. Reports on the overall responsiveness of the technical support
infrastructure, and the status of pending customer inquiries, are provided
regularly to our technical support staff, technical support management, and
executive management.

   We have a core team of technical support staff supplemented by a number of
product developers and consultants who perform technical support on a
rotational basis. This staffing approach ensures that customers have access to
the best available product expertise, while simultaneously providing product
developers with direct customer feedback, which in turn helps us improve our
products.

   We regularly offer training courses to our customers to assist them in
maximizing the benefit they receive from using our products. Our training
classes cover a broad range of topics. Training classes are offered at our
headquarters in Washington, D.C., our facilities in Santa Clara, California,
and at our customers' locations. As of April 30, 2000, our training staff
consisted of three employees.

                                      38
<PAGE>

Research and Development

   We believe that our ability to enhance our current products, and create new
products in response to the needs of our customer base will be an important
factor for our future success. Accordingly, we intend to continue to commit
significant resources to product research and development. We expect to
accomplish a large part of our product improvements and new product
development through internal development efforts. New capabilities may also be
integrated into our product lines through the acquisition of technologies or
businesses, or the licensing of externally developed technologies.

   Our total expenses for research and development for fiscal 1998, 1999, and
2000 were $3.2 million, $4.9 million, and $5.7 million, respectively. Our
research and development efforts to date have been conducted in their entirety
at our headquarters in Washington D.C., and all related costs have been
expensed as incurred. As of April 30, 2000, our research and development staff
consisted of 45 engineers and technical professionals.

   Our research and development efforts are directed at increasing our
revenues by expanding the scope of our solutions to address additional
customer requirements. Our existing customers provide a meaningful source of
information which we use, and expect to continue to use, in order to guide our
future product development. In addition, we invest, and intend to continue to
invest, in research and analysis of trends in our industry and our product
markets, and we expect that our future products will reflect the results of
these analyses.

   Our current research and development efforts are focused on the following:

  . expansion of our model libraries to provide additional coverage of major
    networking standards and technologies, including Dense Wavelength
    Division Multiplexing, or DWDM, MPLS, and Private Network-Network
    Interface, or PNNI;

  . design and packaging of vertical solutions optimized to meet the specific
    needs of service providers, based on our existing technologies;

  . additional interfaces to other network management products in order to
    maximize leverage of information about the existing network environment;

  . new technologies to automate analysis of simulation results and diagnosis
    of performance problems;

  . new technologies that use information collected from the current
    environment and results predicted by simulations to make recommendations
    to our customers;

  . advanced techniques for reducing simulation run times, including hybrid
    simulation, which combines traditional simulation with sequences of fast
    computations and mathematical calculations, and parallel simulation,
    which allows simulations to take advantage of computers with multiple
    processors; and

  . flexible network design and optimization techniques to generate network
    designs based on customer requirements.

Competition

   The market for our products is evolving rapidly and is highly competitive.
We believe that this market is likely to become more competitive as the demand
for predictive network management solutions continues to increase. Although
none of our competitors offers a solution that is identical to ours, we are
subject to current and potential competition from:

  . software vendors with predictive network management offerings, such as
    Compuware, and application performance diagnosis solutions, such as
    Optimal Networks;

  . consultants who offer predictive network management advisory services;
    and

  . customers who develop their own predictive network management
    capabilities, either internally or through outsourcing.

OPNET Netbiz also competes with solutions designed to facilitate and automate
sales processes in general.

                                      39
<PAGE>

   In addition, it is possible that other vendors as well as some of our
customers or distributors will develop and market competitive solutions in the
future. Many of our current and potential competitors are larger and have
substantially greater financial and technical resources than we do.

   We believe the principal competitive factors affecting the market for our
software products are the following:

  . scope, quality, and cost-effectiveness of network management solutions;

  . industry knowledge and expertise;

  . the interoperability of solutions with existing network management
    solutions;

  . product performance, accuracy, technical features, ease of use, and
    price; and

  . customer service and support.

   Although we believe we compete favorably in the industry, the market for
network management solutions is intensely competitive and characterized by
rapid technological change and a number of factors could affect our ability to
compete in the future.

Intellectual Property

   We rely on a combination of copyright, trademark, patent, and trade secret
laws, confidentiality agreements, and contractual provisions to protect our
intellectual property. However, we believe that these laws and agreements
afford us only limited protection. Despite our efforts to protect our
intellectual property, unauthorized parties may infringe upon our proprietary
rights. In addition, the laws of some foreign countries do not provide as much
protection of our proprietary rights as do the laws of the United States.

   We currently hold registered trademarks in the United States for OPNET and
OPNET Modeler, and have pending applications in the United States for the
trademark registrations of IT DecisionGuru and Netbiz. We also hold additional
registered trademarks in the United States and have additional pending
applications. If not renewed, our registered trademarks will expire at various
times between April 2007 and September 2009. We have applied for trademark
protection in a number of international jurisdictions. In addition, we have
two pending patent applications for technologies related to the OPNET product
suite. If granted, the patents would expire in 2018 and 2019. We believe that,
because of the rapid pace of change in our industry, the intellectual property
protection for our products will be a less significant factor for our future
success than the knowledge, abilities, and experience of our employees.

Employees

   As of April 30, 2000, we had 147 full-time employees, all of whom were
located in the United States. These included 51 in sales and marketing, 28 in
professional services, 45 in engineering, research, and development, and 23 in
finance and administration. Our employees are not represented by a collective
bargaining agreement and we consider our relations with our employees to be
good.

Facilities

   Our corporate office and principal facility is located in Washington, D.C.
and consists of approximately 21,000 square feet of office space held under a
lease that expires on December 31, 2000. We also occupy an additional 7,100
square feet of space in the same building under a sublease that expires on
October 31, 2002. We also lease office space in Boston, Dallas, and Santa
Clara. We are currently negotiating to relocate our headquarters to a larger
facility in the Washington, D.C. metropolitan area.

Legal Proceedings

   We are not a party to any material legal proceedings.

                                      40
<PAGE>

                                  MANAGEMENT

Executive Officers, Directors, and Key Employees

   Our executive officers, directors, and some other key employees, and their
ages as of April 30, 2000, are as follows:

<TABLE>
<CAPTION>
 Name                              Age Position
 ----                              --- --------
 <C>                               <C> <S>
 Executive Officers and Directors:

 Marc A. Cohen....................  36 Chairman of the Board and Chief
                                       Executive Officer
 Alain J. Cohen...................  33 President, Chief Technology Officer and
                                       Director
 George M. Cathey.................  34 Senior Vice President of Engineering
 Joseph F. Greeves................  43 Senior Vice President of Finance and
                                       Chief Financial Officer
 Pradeep K. Singh.................  31 Senior Vice President of Engineering,
                                       Model Research and Development
 Bruce R. Evans (1)(2) ...........  41 Director
 Steven G. Finn, PhD (1) .........  53 Director
 William F. Stasior (1)(2)........  59 Director

 Key Employees:

 Erika J. Bohrer..................  32 Vice President of Human Resources
 Melanie A. Houghton..............  37 Vice President of Strategic Business
                                       Development
 Steven R. Johnson................  38 Vice President of Partner Programs
 Randolph W. Jones................  30 Vice President of IT Sales
 Todd J. Kaloudis.................  26 Vice President of Marketing
 Joseph J. Lenz...................  47 Vice President of International Sales
 Eric R. Martin...................  28 Vice President of OPNET Modeler Sales
 Alberto Morales..................  34 Vice President of Information Systems
                                       and Chief Information Officer
 Eric S. Nudelman.................  31 Vice President of Engineering,
                                       Applications and Training
 Annukka Piironen.................  29 Vice President of Consulting Services
 Michael D. Powers................  30 Vice President, Solutions Group
</TABLE>
- --------
(1) Member of the audit committee.
(2) Member of the compensation committee.

   Marc A. Cohen, one of our founders, has served as our chairman of the board
since our inception in 1986 and as our chief executive officer since 1994.
From 1986 to 1992, Mr. Cohen was also a consultant with Booz.Allen & Hamilton,
an international management and consulting company. Mr. Cohen received a
bachelor's degree in engineering science from Harvard and a master's degree in
electrical engineering from Stanford.

   Alain J. Cohen, one of our founders, has served as our president and chief
technology officer and as a member of our board of directors since our
inception in 1986. Mr. Cohen received a bachelor's degree in electrical
engineering from M.I.T.

   George M. Cathey has served as our senior vice president of engineering
since March 1999. From March 1991 to March 1999, Mr. Cathey served as our
director of core technologies. Mr. Cathey received bachelor's and master's
degrees in electrical engineering and computer science from M.I.T.

   Joseph F. Greeves has served as our chief financial officer since November
1998 and as our senior vice president of finance since December 1999. Mr.
Greeves also served as our vice president of finance from November 1998
through December 1999. From November 1997 to August 1998, Mr. Greeves served
as vice president and chief financial officer of ACE*COMM, a
telecommunications software company. From January 1995 to July 1997, Mr.
Greeves served as vice president and chief financial officer of Fusion
Systems, a semiconductor technology company. Mr. Greeves is a certified public
accountant and received a bachelor's degree in accounting from the University
of Maryland.


                                      41
<PAGE>


   Pradeep K. Singh was appointed as our senior vice president of engineering,
model research and development in March 2000. From March 1999 to March 2000,
Mr. Singh served as our vice president of engineering, model research and
development. From September 1995 to February 1999, he served as our director
of model research and development. From October 1994 to August 1995, he was
one of our software engineers. Mr. Singh received a bachelor's degree in
engineering from Delhi College of Engineering (India) and a master's degree in
electrical engineering from Clemson.

   Bruce R. Evans has served as a member of our board of directors since
September 1997. Mr. Evans has been with Summit Partners, a venture capital
firm, since 1986, serving as a general partner since 1991. Mr. Evans currently
serves on the boards of directors of DSET, Omtool, and Private Business.

   Steven G. Finn has served as a member of our board of directors since March
1998. Dr. Finn has been a principal research scientist and lecturer at M.I.T.
since 1991. Dr. Finn has also served as a consultant with Matrix Partners, a
venture capital firm, since 1991.

   William F. Stasior has served as a member of our board of directors since
March 1998. Since October 1999, Mr. Stasior has served as senior chairman of
Booz.Allen & Hamilton. From 1991 to October 1999, Mr. Stasior served as
chairman of Booz.Allen & Hamilton. Mr. Stasior also served as chief executive
officer of Booz.Allen & Hamilton from 1991 to April 1999.

   Erika J. Bohrer has served as our vice president of human resources since
March 1999. From May 1997 to March 1999, she served as our director of human
resources. From May 1989 to May 1997, Ms. Bohrer held various recruiting
positions with Booz.Allen & Hamilton.

   Melanie A. Houghton has served as our vice president of strategic business
development since September 1999. From June 1998 to August 1999, Ms. Houghton
served as our director of strategic sales, and from June 1996 to May 1998, she
served as one of our sales associates. From February 1995 to May 1996, Ms.
Houghton served as one of our human resources administrators.

   Steven R. Johnson has served as our vice president of partner programs
since March 1999. From October 1998 to March 1999, he served as our director
of marketing. From 1988 to September 1998, he held various marketing positions
with Hewlett-Packard.

   Randolph W. Jones has served as our vice president of IT sales since June
1999. From October 1998 to May 1999, Mr. Jones served as senior vice president
of a division of Parametric Technology Corporation, a software company. From
May 1994 to October 1998, Mr. Jones served as a divisional vice president of
Computer Associates International, a business software company.

   Todd J. Kaloudis was appointed as our vice president of marketing in March
2000. Prior to that, Mr. Kaloudis served as our vice president of
international business development from November 1999 to March 2000. From May
1998 to November 1999, Mr. Kaloudis served as manager of technology strategy
at Teledesic, a global broadband satellite venture. Mr. Kaloudis also served
as a network design engineer at Teledesic from September 1996 to May 1998.
Prior to September 1996, Mr. Kaloudis was a student at M.I.T.

   Joseph J. Lenz has served as our vice president of international sales
since May 2000. From December 1999 to April 2000, Mr. Lenz was the co-founder
and president of Intermeasure.com, an e-commerce software company. From
September 1995 to December 1999, Mr. Lenz served as the president of CACI
Products, a network software company. From 1993 to August 1995, Mr. Lenz
served as senior vice president-sales worldwide of CACI Products.

   Eric R. Martin was appointed as our vice president of OPNET Modeler sales
in March 2000. From April 1999 to March 2000, Mr. Martin served as our vice
president of R & D sales. From January 1998 to March 1999, Mr. Martin served
as one of our sales engineers. From September 1995 to September 1997,
Mr. Martin was a student and research assistant at M.I.T. From March 1995 to
August 1995, Mr. Martin worked as an architectural designer for Liu and
Associates (Taiwan), an urban design firm.

   Alberto Morales has served as our chief information officer since February
1997 and our vice president of information systems since March 1999. Mr.
Morales also served as our director of information systems from February 1997
to March 1999. From July 1995 to February 1997, Mr. Morales served as a
software engineer at

                                      42
<PAGE>


FGM, a software engineering consulting company. From October 1994 to June
1995, Mr. Morales served as president of Virtesco, Inc., an engineered
textiles company.

   Eric S. Nudelman has served as our vice president of engineering
applications and training since March 1999. From March 1996 to March 1999, Mr.
Nudelman served as our director of training and technical marketing services.
From September 1995 to March 1996, Mr. Nudelman served as our assistant
director of strategic technical programs. From January 1993 to September 1995,
Mr. Nudelman was one of our applications engineers.

   Annukka Piironen has served as our vice president of consulting services
since March 1999. From August 1996 to March 1999, Ms. Piironen served as our
director of consulting services and director of modeling services. From
September 1995 to July 1996, she served as our co-director of model research
and development. From April 1994 to September 1995, she was one of our
application engineers.

   Michael D. Powers has served as our vice president, solutions group since
March 1999. From April 1998 to March 1999, Mr. Powers served as our director
of solutions group. From September 1995 to April 1998, Mr. Powers served as
our director of maintenance and technical support operations. From June 1992
to September 1995, Mr. Powers was one of our applications engineers.

   Each executive officer serves at the discretion of the board of directors
and holds office until his successor is elected and qualified or until his
earlier resignation or removal. There are no family relationships among any of
our directors or executive officers, except that Marc Cohen and Alain Cohen
are brothers.

   Pursuant to a shareholders agreement, dated as of September 30, 1997, by
and among Summit Ventures IV, L.P., Summit Investors III, L.P., Marc Cohen,
Alain Cohen, and us, Summit Ventures IV, L.P. and Summit Investors III, L.P.
were given the right to elect one representative to the board of directors.
Mr. Evans was elected as the representative of Summit Ventures IV, L.P. and
Summit Investors III, L.P. In addition, Marc Cohen, Alain Cohen, Summit
Ventures IV, L.P., and Summit Investors III, L.P. were given the right to
jointly elect one director who was not one of our employees and also not
affiliated with Marc Cohen, Alain Cohen, Summit Ventures IV, L.P., and Summit
Investors III, L.P. Dr. Finn was jointly elected by Marc Cohen, Alain Cohen,
Summit Ventures IV, L.P., and Summit Investors III, L.P. These rights
terminate upon the completion of this offering.

Compensation of Directors

   We reimburse directors for reasonable out-of-pocket expenses incurred in
attending meetings of the board of directors. Following this offering, our
non-employee directors will receive automatic annual grants of stock options
pursuant to our 2000 director stock option plan. In November 1998, we issued
    shares of common stock to each of Dr. Finn and Mr. Stasior at a purchase
price of $   per share, and granted to each of Dr. Finn and Mr. Stasior an
option to purchase      shares of common stock at an exercise price of $   per
share.

Board Committees

   The board of directors has established a compensation committee and an
audit committee. The compensation committee, which consists of Mr. Evans and
Mr. Stasior, reviews executive salaries, administers our bonus, incentive
compensation, and stock plans, and approves the salaries and other benefits of
our executive officers. In addition, the compensation committee consults with
our management regarding our pension and other benefit plans and compensation
policies and practices.

   The audit committee, which consists of Mr. Evans, Dr. Finn, and Mr.
Stasior, reviews the professional services provided by our independent
accountants, the independence of our accountants from our management, our
annual financial statements and our system of internal accounting controls.
The audit committee also reviews other matters with respect to our accounting,
auditing, and financial reporting practices and procedures as it may find
appropriate or may be brought to its attention.

Election of Directors

   Following this offering, the board of directors will be divided into three
classes, each of whose members will serve for a staggered three-year term. Mr.
Evans will serve in the class whose term expires in 2001;

                                      43
<PAGE>

Alain Cohen and Dr. Finn will serve in the class of directors whose term
expires in 2002; and Marc Cohen and Mr. Stasior will serve in the class of
directors whose term expires in 2003. Upon the expiration of the term of a
class of directors, directors in that class will be eligible to be elected for
a new three-year term at the annual meeting of stockholders in the year in
which that term expires.

Compensation Committee Interlocks and Insider Participation

   We did not have a compensation committee until March 2000. Prior to that
time, the entire board of directors performed the function of a compensation
committee. No member of our compensation committee is an officer or employee.
No interlocking relationships exist between any member of our board of
directors or compensation committee and the board of directors or compensation
committee of any other company, nor has any interlocking relationship existed
in the past.

Agreements with Executives

   Marc Cohen and Alain Cohen each entered into a non-compete agreement with
us on September 30, 1997. Under the agreements, Marc Cohen and Alain Cohen
each agreed not to compete with us during the term of his employment and, in
the event that his employment with us is terminated either at his voluntary
election or by us for good cause, for a period of 12 months thereafter. In
addition, Marc Cohen and Alain Cohen agreed not to solicit our employees or
customers on behalf of any competitor during the same period. Also, Marc Cohen
and Alain Cohen each agreed to protect our confidential information during his
employment, except as appropriate in the performance of his duties, and after
the termination of his employment.

   Mr. Cathey serves as our senior vice president of engineering pursuant to
the terms of an employment agreement dated December 4, 1995. The agreement
expires on December 4, 2001. Pursuant to the terms of the agreement, Mr.
Cathey initially received an annual salary of $100,000, subject to periodic
increases at our discretion. Mr. Cathey's salary for fiscal 1999 was $142,155.
Under the agreement, Mr. Cathey agreed not to compete with us during the term
of his employment and for 18 months after termination of his employment. Mr.
Cathey also agreed not to solicit our employees or customers during the same
period.

   We intend to enter into change-of-control agreements with Mr. Cathey, Mr.
Greeves, our senior vice president of finance and chief financial officer, and
Mr. Singh, our senior vice president of engineering, model research and
development. Pursuant to the terms of each agreement, if, during the one-year
period after a change in control of OPNET, we terminate the executive's
employment without cause or if the executive resigns within 90 days after we
diminish his position, authority, or responsibilities, reduce his annual base
salary or benefits, or relocate him, the executive will be entitled to:

  .  a lump sum payment equal to the sum of his highest annual salary and
     highest annual bonus received during the five-year period preceding the
     change in control; and

  .  continued employee benefits coverage for 12 months.

Each of the change-of-control agreements expire on the first to occur of March
31, 2003, if a change in control has not occurred prior to that date, or the
date 12 months after the occurrence of a change in control. In addition, if
not previously terminated, each agreement will be automatically extended for
additional one year terms unless we notify the executive that the agreement
will not be extended.

   We also intend to enter into nondisclosure, non-compete, nonsolicitation
and ownership of inventions agreements with Messrs. Greeves and Singh, under
which each executive will agree to protect our confidential information during
and after the termination of his employment, and not to compete with us during
the term of his employment and for 12 months after termination of his
employment.

Executive Compensation

   The table below sets forth, for the years ended March 31, 1999 and 2000,
the cash compensation earned and shares underlying options granted to our
chairman of the board and chief executive officer and each of the other four
executive officers who received annual compensation in excess of $100,000 for
the fiscal year ended March 31, 2000, collectively referred to as the named
executive officers.

                                      44
<PAGE>

                          Summary Compensation Table

<TABLE>
<CAPTION>
                                                   Compensation
                                                   Awards Long-
                                                       term
                                       Annual      ------------
                                    Compensation      Shares
         Name and          Fiscal ----------------  Underlying     All Other
    Principal Position      Year   Salary   Bonus    Options    Compensation(1)
    ------------------     ------ -------- ------- ------------ ---------------
<S>                        <C>    <C>      <C>     <C>          <C>
Marc A. Cohen.............  1999  $156,000     --      --           $3,000
  Chairman of the board     2000   120,000 $70,000     --            3,000
  and chief executive
  officer
Alain J. Cohen............  1999   156,000     --      --            3,000
  President and chief
   technology officer       2000   120,000  70,000     --            3,000
George M. Cathey..........  1999   142,155  27,296                   3,000
  Senior vice president of
   engineering              2000   155,460  26,878                   3,000
Joseph F. Greeves.........  1999    44,551   1,042                     --
  Senior vice president of  2000   157,875  70,000     --            3,000
  finance and chief
  financial officer
Pradeep K. Singh..........  1999    95,000  39,521                   3,000
  Senior vice president of  2000   123,333  41,563     --            3,000
  engineering, model
  research and development
</TABLE>
- --------
(1) Represents amounts contributed by us under our 401(k) plan.

   In March 2000, the board of directors increased the annual salary of each
of Marc Cohen and Alain Cohen to $200,000.

Stock Options

   The table below contains information concerning the grant of options to
purchase shares of our common stock to each of the named executive officers
during the year ended March 31, 2000. The percentage of total options granted
to employees set forth below is based on an aggregate of shares subject to
options granted to our employees in fiscal 2000. All options were granted at
or above fair market value as determined by the board of directors on the date
of grant.

<TABLE>
<CAPTION>
                                                                         Potential Realizable
                                                                               Value at
                                                                            Assumed Annual
                                                                         Rates of Stock Price
                                                                           Appreciation for
                                        Individual Grants                   Option Term (1)
                         ----------------------------------------------- ---------------------
                         Number of    Percent of
                         Securities      Total
                         Underlying Options Granted Exercise
                          Options   To Employees in   Price   Expiration
    Name                  Granted     Fiscal Year   Per Share    Date        5%        10%
    ----                 ---------- --------------- --------- ---------- ---------- ----------
<S>                      <C>        <C>             <C>       <C>        <C>        <C>
Marc A. Cohen...........    --            --            --       --             --         --
Alain J. Cohen..........    --            --            --       --             --         --
George M. Cathey........                     %        $                  $          $
Joseph F. Greeves.......    --            --            --       --             --         --
Pradeep K. Singh........    --            --            --       --             --         --
</TABLE>
                       Option Grants in Last Fiscal Year

- --------
(1) The potential realizable value is calculated based on the term of the
    option at the time of grant. Stock price appreciation of 5% and 10% is
    assumed pursuant to rules promulgated by the Securities and Exchange
    Commission and does not represent our prediction of our stock price
    performance. The potential realizable values at 5% and 10% appreciation
    are calculated by assuming that the exercise price on the date of grant
    appreciates at the indicated rate for the entire term of the option and
    that the option is exercised at the exercise price and sold on the last
    day of its term at the appreciated price.

                                      45
<PAGE>


   The table below sets forth information for each of the named executive
officers with respect to options to purchase common stock exercised during the
year ended March 31, 2000 and the value of options outstanding as of March 31,
2000.

     Aggregate Option Exercises in the Year Ended March 31, 2000 and
                  Fiscal Year-End Option Holdings and Values

<TABLE>
<CAPTION>
                                                    Number of Securities
                                                   Underlying Unexercised   Value of Unexercised In-
                                                   Options at Fiscal Year-    The-Money Options at
                                                             End                 Fiscal Year-End
                                                  ------------------------- -------------------------
                         Shares Acquired  Value
          Name             on Exercise   Realized Exercisable Unexercisable Exercisable Unexercisable
          ----           --------------- -------- ----------- ------------- ----------- -------------
<S>                      <C>             <C>      <C>         <C>           <C>         <C>
Marc A. Cohen...........       --           --        --           --           --            --
Alain J. Cohen..........       --           --        --           --           --            --
George M. Cathey........                   $          --                        --          $
Joseph F. Greeves.......                              --                        --
Pradeep K. Singh........                              --                        --
</TABLE>

   There was no public trading market for our common stock as of March 31,
2000. Accordingly, as permitted by the rules of the Securities and Exchange
Commission, we have calculated the value of unexercised in-the-money options
at fiscal year-end on the basis of the fair market value of our common stock
as of March 31, 2000 of $   per share, as determined by the board of
directors, less the aggregate exercise price.

Stock and Benefit Plans

   Amended and Restated 1993 Incentive Stock Option Plan

   Our original stock option plan provided for the grant of incentive stock
options intended to qualify under Section 422 of the Internal Revenue Code. As
of April 30, 2000, options to purchase      shares of common stock were
outstanding under the 1993 plan. The 1993 plan provides that, in the event of
a merger, liquidation or other acquisition event, our board of directors must
provide that all outstanding options or other stock-based awards under the
1993 plan be assumed or substituted for by the acquiror. If any of these
events constitutes a change in control, and if within one year of the change
of control, the optionee's employment is terminated without cause or the
optionee leaves for good reason, then the assumed or substituted options will
be immediately exercisable in full. Following this offering, our board of
directors has provided that no additional grants will be made under the 1993
plan.

   2000 Stock Incentive Plan

   Our 2000 stock incentive plan was adopted by our board of directors in
March 2000 and will be submitted to our stockholders for approval in May 2000.
Up to      shares of our common stock, subject to adjustment in the event of
stock splits and other similar events, were reserved for issuance under the
2000 plan. To date, we have not granted any options under the 2000 plan, but
the board of directors has approved the grant to some of our employees upon
the completion of this offering of options to purchase up to     shares of our
common stock with an exercise price equal to the initial public offering price
per share in this offering.

   The 2000 plan provides for the grant of incentive stock options intended to
qualify under Section 422 of the Internal Revenue Code, nonstatutory stock
options, restricted stock awards and other stock-based awards.

   Our officers, employees, directors, consultants and advisors and those of
our subsidiaries are eligible to receive awards under the 2000 plan. Under
present law, however, incentive stock options may only be granted to
employees.

   Optionees receive the right to purchase a specified number of shares of our
common stock at a specified option price, subject to the terms and conditions
of the option grant. We may grant options at an exercise price less than,
equal to or greater than the fair market value of our common stock on the date
of grant. Under present law, incentive stock options and options intended to
qualify as performance-based compensation under

                                      46
<PAGE>

Section 162(m) of the Internal Revenue Code may not be granted at an exercise
price less than the fair market value of the common stock on the date of
grant, or less than 110% of the fair market value in the case of incentive
stock options granted to optionees holding more than 10% of our voting power.
The 2000 plan permits our board of directors to determine how optionees may
pay the exercise price of their options, including by cash, check or in
connection with a "cashless exercise" through a broker, by surrender of shares
of common stock to us, or by any combination of the permitted forms of
payment.

   Our board of directors administers the 2000 plan. Our board of directors
has the authority to adopt, amend and repeal the administrative rules,
guidelines and practices relating to the 2000 plan and to interpret its
provisions. It may delegate authority under the 2000 plan to one or more
committees of the board of directors and, in limited circumstances, to one or
more of our executive officers. Our board of directors has authorized the
compensation committee to administer the 2000 plan, including the granting of
options to our executive officers. Subject to any applicable limitations
contained in the 2000 plan, our board of directors, our compensation committee
or any other committee or executive officer to whom our board of directors
delegates authority, as the case may be, selects the recipients of awards and
determines:

  . the number of shares of common stock covered by options and the dates
    upon which such options become exercisable;

  . the exercise price of options;

  . the duration of options; and

  . the number of shares of common stock subject to any restricted stock or
    other stock-based awards and the terms and conditions of such awards,
    including the conditions for repurchase, issue price and repurchase
    price.

   In the event of a merger, liquidation or other acquisition event, our board
of directors must provide that all outstanding options or other stock-based
awards under the 2000 plan be assumed or substituted for by the acquiror. If
any of these events constitutes a change in control, and if within one year of
the change of control, the optionee's employment is terminated without cause
or the optionee leaves for good reason, then the assumed or substituted
options will be immediately exercisable in full.

   No award may be granted under the 2000 plan after March 2010, but the
vesting and effectiveness of awards granted before those dates may extend
beyond those dates. Our board of directors may at any time amend, suspend or
terminate the 2000 plan.

   2000 Director Stock Option Plan

   Our 2000 director stock option plan was adopted by our board of directors
in March 2000 and will be submitted to our stockholders for approval in May
2000. Under the director stock option plan, directors who are not our
employees will be eligible to receive non-statutory options to purchase shares
of our common stock. A total of      shares of our common stock may be issued
upon the exercise of options granted under the director stock option plan.

   Under the terms of the director stock option plan:

  .  each person serving as a non-employee director upon completion of this
     offering will be granted an option to purchase     shares of our common
     stock;

  .  each person who first becomes a non-employee director after the
     completion of this offering will be granted an option on the date of his
     or her election to purchase a number of shares of common stock
     calculated by multiplying      by the number of full calendar months
     remaining from the date of his election until the first anniversary of
     the last annual stockholders meeting; and

  .  each non-employee director will receive an option to purchase
     shares of our common stock following each annual meeting of our
     stockholders commencing with the 2001 annual meeting of stockholders.

                                      47
<PAGE>

   These options vest immediately in full upon the option grant date. The
exercise price per share of all options will equal the fair market value per
share of our common stock on the option grant date, which in the case of the
options to be granted upon completion of this offering will be deemed to be
the initial public offering price per share in this offering. Each grant under
the director stock option plan will have a maximum term of ten years, subject
to earlier termination following the optionee's cessation of service.

   2000 Employee Stock Purchase Plan

   Our 2000 employee stock purchase plan was adopted by our board of directors
in March 2000 and will be submitted to our stockholders for approval in May
2000. The purchase plan authorizes the issuance of up to a total of
shares of our common stock to participating employees.

   All of our employees, including our directors who are employees, and all
employees of any participating subsidiaries, whose customary employment is
more than 20 hours per week and for more than six months in any calendar year,
are eligible to participate in the purchase plan once they have been employed
by us or any subsidiary for a six month period. Employees who would
immediately after the grant own 5% or more of the total combined voting power
or value of our stock or that of any subsidiary are not eligible to
participate.

   On the first day of a designated payroll deduction period, or offering
period, we will grant to each eligible employee who has elected to participate
in the purchase plan an option to purchase shares of our common stock as
follows: the employee may authorize up to a maximum of 10% of his or her base
pay to be deducted by us from his or her base pay during the offering period.
On the last day of this offering period, the employee is deemed to have
exercised the option, at the option exercise price, to the extent of
accumulated payroll deductions. Under the terms of the purchase plan, the
option price is an amount equal to 85% of the closing price, as defined in the
purchase plan, per share of our common stock on either the first day or the
last day of the offering period, whichever is lower. The first offering period
under the purchase plan will commence on the first day of the fiscal quarter
beginning after the completion of this offering. In no event may an employee
purchase in any one offering period a number of shares that exceeds the number
of shares determined by dividing $25,000 by the average market price of a
share of our common stock on the commencement date of the offering period. Our
compensation committee may, in its discretion, choose an offering period of 12
months or less for each offering and choose a different offering period for
each offering.

   An employee who is not a participant on the last day of the offering period
is not entitled to exercise any option, and the employee's accumulated payroll
deductions will be refunded. An employee's rights under the purchase plan
terminate upon voluntary withdrawal from the purchase plan at any time, or
when the employee ceases employment for any reason, except that upon
termination of employment because of death, the employee's beneficiary has a
right to elect to exercise the option to purchase the shares which the
accumulated payroll deductions in the participant's account would purchase at
the date of death.

   Because participation in the purchase plan is voluntary, we cannot now
determine the number of shares of our common stock to be purchased by any of
our current executive officers, by all of our current executive officers as a
group or by our non-executive employees as a group. Marc Cohen and Alain Cohen
are not eligible to participate in the purchase plan.

   401(k) Plan

   In August 1993, we adopted an employee savings and retirement plan
qualified under Section 401 of the Internal Revenue Code and covering all of
our employees. Pursuant to the 401(k) plan, employees may elect to reduce
their current compensation by up to the statutorily prescribed annual limit
and have the amount of such reduction contributed to the 401(k) plan. We make
matching contributions to the 401(k) plan, and may make discretionary and
extra contributions in amounts determined annually by our board of directors.
We contributed amounts to our 401(k) plan totaling approximately $92,000 in
fiscal 1998, $140,000 in fiscal 1999, and $236,000 in fiscal 2000.


                                      48
<PAGE>


                        RELATED PARTY TRANSACTIONS

Stock Purchases by Affiliates and Related Matters

   In September 1997, we issued and sold shares of series A convertible
preferred stock as set forth below at a purchase price of $48.40 per share.
Upon completion of this offering, each share of series A convertible preferred
stock will automatically convert into      shares of common stock.

<TABLE>
<CAPTION>
                                                    Number of Shares of Series A
   Name of Investor                                 Convertible Preferred Stock
   ----------------                                 ----------------------------
   <S>                                              <C>
   Summit Ventures IV, L.P.........................           138,422
   Summit Investors III, L.P.......................             6,218
</TABLE>

   Mr. Evans, one of our directors, is a partner of Summit Partners L.P.
Summit Partners is the general partner of the general partner of each of
Summit Ventures IV, L.P. and Summit Investors III, L.P.

   In October 1997, we repurchased shares of common stock from Marc Cohen,
Alain Cohen, and Mr. Cathey as set forth below at a purchase price of $
per share. Marc Cohen is our chairman of the board and chief executive
officer, Alain Cohen is our president and chief technology officer and a
director, and Mr. Cathey is our senior vice president of engineering.

<TABLE>
<CAPTION>
                                                             Number of Shares of
   Name of Stockholder                                           Common Stock
   -------------------                                       -------------------
   <S>                                                       <C>
   Marc A. Cohen............................................
   Alain J. Cohen...........................................
   George M. Cathey.........................................
</TABLE>

   In November 1998, we issued and sold      shares of common stock to each of
Dr. Finn and Mr. Stasior at a purchase price of $    per share, and granted to
each of Dr. Finn and Mr. Stasior an option to purchase      shares of common
stock at an exercise price of $    per share. Dr. Finn and Mr. Stasior are
members of our board of directors.

Option Amendment and Loan to Executive Officer

   On January 20, 2000, we amended Mr. Cathey's option agreement to purchase
     shares of common stock at $    per share, which was not then exercisable,
in order to make it immediately exercisable. Mr. Cathey then exercised the
option in full on that date and borrowed $231,024 from us to pay income taxes
incurred by him upon purchasing the shares under the option, as evidenced by a
promissory note. The note bears interest at an annual rate of 6.0%, and all
principal and accrued interest payable under the note is due on the first
anniversary of this offering. We have agreed to make additional loans to Mr.
Cathey, which will also be evidenced by promissory notes, if it is
subsequently determined that he owes additional taxes in connection with the
purchase of the shares. Any subsequent notes will also bear interest at an
annual rate of 6.0%, and all principal and accrued interest payable under the
notes will be due on the earlier of the second anniversary of the date of
issuance of the note or the first anniversary of this offering. The loan, and
any subsequent loans, are recourse to Mr. Cathey and are secured by the shares
of common stock that he purchased upon the exercise of the option. The balance
of principal and interest outstanding under these loans was $231,024 and
$3,836, as of April 30, 2000.


Policy on Future Transactions

   Our board of directors has adopted the policy that all future transactions,
including loans between us and our officers, directors, principal stockholders
and their affiliates, will be approved by a majority of the board of
directors, including a majority of the independent and disinterested outside
directors on the board of directors, and will be on terms no less favorable to
us than could be obtained from unaffiliated third parties.

                                      49
<PAGE>

                            PRINCIPAL STOCKHOLDERS

   The following table sets forth information regarding beneficial ownership
of our common stock as of April 30, 2000, assuming the conversion of all our
outstanding convertible preferred stock, by:
  .  each person who beneficially owns more than 5% of the outstanding shares
     of our common stock;
  .  each of our directors;
  .  each of the named executive officers; and
  .  all of our directors and executive officers as a group.

   The percentages shown are based on      shares of common stock outstanding
as of April 30, 2000 and      shares of common stock outstanding after this
offering, including the      shares that are being offered for sale by us in
this offering. Beneficial ownership is determined in accordance with the rules
of the Securities and Exchange Commission, and includes voting and investment
power with respect to shares. The number of shares beneficially owned by a
person includes shares of common stock subject to options held by that person
that are currently exercisable or exercisable within 60 days of April 30,
2000. The shares issuable under those options are treated as if they were
outstanding for computing the percentage ownership of the person holding those
options but are not treated as if they were outstanding for the purposes of
computing the percentage ownership of any other person. Unless otherwise
indicated below, to our knowledge, all persons named in the table have sole
voting and investment power with respect to their shares of common stock,
except to the extent authority is shared by spouses under applicable law.
Unless otherwise indicated, the address of each person owning more than 5% of
the outstanding shares of common stock is c/o OPNET Technologies, Inc., 3400
International Drive, N.W., Washington, D.C. 20008.

<TABLE>
<CAPTION>
                                                                Percentage of
                                                                Common Stock
                                                                Beneficially
                                                                    Owned
                                                              -----------------
                                          Shares Beneficially Prior to  After
Beneficial Owner                                 Owned        Offering Offering
- ----------------                          ------------------- -------- --------
<S>                                       <C>                 <C>      <C>
Entities affiliated with Summit Partners
 L.P. (1)...............................                           %        %
  600 Atlantic Avenue
  Boston, MA 02210
Marc A. Cohen...........................
Alain J. Cohen..........................
George M. Cathey (2)....................
Joseph F. Greeves(3)....................
Pradeep K. Singh (4)....................
Bruce R. Evans (5)......................
Steven G. Finn (6)......................
William F. Stasior (7)..................
All executive officers and directors as
 a group (8 persons)....................
</TABLE>
- --------
 * Less than 1% of the outstanding common stock.

(1) Consists of shares of      common stock held by Summit Ventures IV, L.P.
    and      shares of common stock held by Summit Investors III, L.P. Summit
    Partners, LLC is the general partner of Summit Partners IV, L.P., which is
    the general partner of Summit Ventures IV, L.P. Summit Partners, LLC,
    through an investment committee, has voting and dispositive authority over
    the shares held by Summit Ventures IV, L.P. and Summit Investors III, L.P.

(2) Includes      shares of common stock issuable upon exercise of outstanding
    options.

(3) Includes      shares of common stock issuable upon exercise of outstanding
    options.

(4) Includes      shares of common stock issuable upon exercise of outstanding
    options.

(5) Consists of      shares of common stock held by Summit Ventures IV, L.P.
    and      shares of common stock held by Summit Investors III, L.P. Summit
    Partners, LLC is the general partner of Summit Partners IV, L.P., which is
    the general partner of Summit Ventures IV, L.P. Summit Partners, LLC,
    through an investment committee, has voting and dispositive authority over
    the shares held by Summit Ventures IV, L.P. and Summit Investors III, L.P.
    Mr. Evans is a general partner of Summit Partners L.P. Mr. Evans does not
    have voting or dipositive authority over the shares held by Summit
    Ventures IV, L.P. and Summit Investors III, L.P. and disclaims beneficial
    ownership of these shares.

(6) Includes      shares of common stock issuable upon exercise of outstanding
    options.

(7) Includes      shares of common stock issuable upon exercise of outstanding
    options.

                                      50
<PAGE>

                         DESCRIPTION OF CAPITAL STOCK

   Upon completion of this offering, our authorized capital stock will consist
of 100,000,000 shares of common stock, $.001 par value per share, and
5,000,000 shares of preferred stock, $.001 par value per share. The following
is a summary of the material features of our capital stock. For more detail,
please see our amended and restated certificate of incorporation and amended
and restated by-laws to be effective after the completion of this offering,
filed as exhibits to the registration statement of which this prospectus is a
part.

Common Stock

   As of April 30, 2000, there were      shares of common stock outstanding
held by 17 stockholders of record. Based upon the number of shares outstanding
as of that date, and giving effect to the automatic conversion of our
outstanding convertible preferred stock and the issuance of the shares of
common stock offered by us in this offering, there will be      shares of
common stock outstanding upon the completion of this offering.

   Holders of common stock are entitled to one vote for each share held on all
matters submitted to a vote of stockholders and do not have cumulative voting
rights. Directors are elected by a plurality of the votes of the shares
present in person or by proxy at the meeting and entitled to vote in such
election. Subject to preferences that may be applicable to any outstanding
preferred stock, holders of common stock are entitled to receive ratably such
dividends, if any, as may be declared by the board of directors out of funds
legally available to pay dividends. Upon our liquidation, dissolution, or
winding up, the holders of common stock are entitled to receive ratably all
assets after the payment of our liabilities, subject to the prior rights of
any outstanding preferred stock. Holders of the common stock have no
preemptive, subscription, redemption, or conversion rights. They are not
entitled to the benefit of any sinking fund. The outstanding shares of common
stock are, and the shares offered by us in this offering will be, when issued
and paid for, validly issued, fully paid, and nonassessable. The rights,
powers, preferences, and privileges of holders of common stock are subject to
the rights of the holders of shares of any series of preferred stock which we
may designate and issue in the future.

   At present, there is no established trading market for the common stock. We
have applied to list our common stock on The Nasdaq Stock Market's National
Market under the symbol "OPNT."

Preferred Stock

   Upon the completion of this offering, the board of directors will be
authorized, subject to any limitations prescribed by law, without further
stockholder approval, to issue up to an aggregate of 5,000,000 shares of
preferred stock. The preferred stock may be issued in one or more series and
on one or more occasions. Each series of preferred stock will have the number
of shares, designations, preferences, voting powers, qualifications and
special or relative rights or privileges as the board of directors may
determine. These rights and privileges may include, among others, dividend
rights, voting rights, redemption provisions, liquidation preferences,
conversion rights and preemptive rights.

   The issuance of preferred stock, while providing desirable flexibility in
connection with possible acquisitions and other corporate purposes, could
adversely affect the voting power or other rights of the holders of common
stock. In addition, the issuance of preferred stock could make it more
difficult for a third party to acquire us, or discourage a third party from
attempting to acquire us. Upon completion of this offering there will be no
shares of preferred stock outstanding, and we do not have any current plans to
issue preferred stock after this offering.

Delaware Law and Certain Charter and By-Law Provisions; Anti-Takeover Effects

   We are subject to the provisions of Section 203 of the General Corporation
Law of Delaware. Section 203 prohibits a publicly held Delaware corporation
from engaging in a business combination with an interested

                                      51
<PAGE>

stockholder for a period of three years after the date of the transaction in
which the person became an interested stockholder, unless the business
combination is approved in a prescribed manner. A business combination
includes mergers, consolidations, asset sales, and other transactions
involving OPNET and an interested stockholder. In general, an interested
stockholder is a person who, together with affiliates and associates, owns, or
within three years did own, 15% or more of the corporation's voting stock.

   Our amended and restated certificate of incorporation and amended and
restated by-laws to be effective upon the completion of this offering provide:

  . that the board of directors be divided into three classes, as nearly
    equal in size as possible, with staggered three-year terms;

  . that directors may be removed only for cause by the affirmative vote of
    the holders of at least 75% of the shares of our capital stock entitled
    to vote; and

  . that any vacancy on the board of directors, however occurring, including
    a vacancy resulting from an enlargement of the board, may only be filled
    by vote of a majority of the directors then in office.

   The classification of the board of directors and the limitations on the
removal of directors and filling of vacancies could have the effect of making
it more difficult for a third party to acquire us, which could have the effect
of discouraging a third party from attempting to do so.

   Our amended and restated certificate of incorporation and amended and
restated by-laws will also provide that:

  . any action required or permitted to be taken by the stockholders at an
    annual meeting or special meeting of stockholders may only be taken if it
    is properly brought before such meeting and may not be taken by written
    action in lieu of a meeting; and

  . special meetings of the stockholders may only be called by the chairman
    of the board of directors, the president, or by the board of directors.

   Our amended and restated by-laws provide that, in order for any matter to
be considered properly brought before a meeting, a stockholder must comply
with requirements regarding advance notice to us. These provisions could delay
until the next stockholders' meeting stockholder actions which are favored by
the holders of a majority of our outstanding voting securities. These
provisions may also discourage another person or entity from making a tender
offer for our common stock, because such person or entity, even if it acquired
a majority of our outstanding voting securities, would be able to take action
as a stockholder, such as electing new directors or approving a merger, only
at a duly called stockholders meeting, and not by written consent.

   Delaware's corporation law provides generally that the affirmative vote of
a majority of the shares entitled to vote on any matter is required to amend a
corporation's certificate of incorporation or by-laws, unless a corporation's
certificate of incorporation or by-laws, as the case may be, requires a
greater percentage. Our amended and restated certificate of incorporation
requires the affirmative vote of the holders of at least 75% of the shares of
our capital stock entitled to vote to amend or repeal any of the provisions of
our amended and restated certificate of incorporation described above.
Generally, our amended and restated by-laws may be amended or repealed by a
majority vote of the board of directors or the holders of a majority of the
shares of our capital stock issued and outstanding and entitled to vote. To
amend our amended and restated by-laws regarding special meetings of
stockholders, written actions of stockholders in lieu of a meeting, and the
election, removal, and classification of members of the board of directors
requires the affirmative vote of the holders of at least 75% of the shares of
our capital stock entitled to vote. The stockholder vote would be in addition
to any separate class vote that might in the future be required pursuant to
the terms of any series preferred stock that might be outstanding at the time
any amendments are submitted to stockholders.

                                      52
<PAGE>

Limitation of Liability and Indemnification

   Our amended and restated certificate of incorporation provides that our
directors and officers will be indemnified by us to the fullest extent
authorized by the General Corporation Law of Delaware. This indemnification
would cover all expenses and liabilities reasonably incurred in connection
with their services for or on behalf of us. In addition, our amended and
restated certificate of incorporation provides that our directors will not be
personally liable for monetary damages to us for breaches of their fiduciary
duty as directors, unless they violated their duty of loyalty to us or our
stockholders, acted in bad faith, knowingly or intentionally violated the law,
authorized illegal dividends or redemptions, or derived an improper personal
benefit from their action as directors.

Transfer Agent and Registrar

   The transfer agent and registrar for our common stock is      .

                                      53
<PAGE>

                        SHARES ELIGIBLE FOR FUTURE SALE

   Upon completion of this offering, we will have      shares of common stock
outstanding assuming no exercise of outstanding options. Of these shares, the
     shares to be sold in this offering will be freely tradable without
restriction or further registration under the Securities Act of 1933, as
amended, except that any shares purchased by our affiliates, as that term is
defined in Rule 144 under the Securities Act, may generally only be sold in
compliance with the limitations of Rule 144 described below. All shares of our
common stock outstanding prior to this offering are subject to 180-day lock-up
agreements described below and may not be sold in the public market prior to
the expiration of the lock-up agreements. Morgan Stanley & Co. Incorporated
may release the shares subject to the lock-up agreements in whole or in part
at any time without prior public notice. However, Morgan Stanley & Co.
Incorporated has no current plans to effect such a release. Upon the
expiration of the lock-up agreements, approximately      additional shares
will be available for sale in the public market, subject in some cases to
compliance with the volume and other limitations of Rule 144.

Sales of Restricted Shares

<TABLE>
<CAPTION>
 Days After Date
       of            Approximate Shares
 This Prospectus  Eligible for Future Sale                     Comment
 ---------------  ------------------------                     -------
<S>               <C>                      <C>
Upon
 effectiveness..                           Freely tradeable; sold in this offering
180 days after
 effectiveness                             Lock-up expires; shares salable
 ...............                           under Rule 144, 144(k) or 701
Various dates                              Restricted securities held for one year or less
 thereafter.....                           as of 180 days following effectiveness
</TABLE>

   In general, under Rule 144, a person, including an affiliate, who has
beneficially owned shares for at least one year is entitled to sell, within
any three-month period, a number of such shares that does not exceed the
greater of (1) one percent of the then outstanding shares of common stock, or
approximately      shares immediately after this offering, or (2) the average
weekly trading volume in the common stock in the over-the-counter market
during the four calendar weeks preceding the date on which notice of such sale
is filed, provided specified requirements concerning availability of public
information, manner of sale and notice of sale have been satisfied. In
addition, our affiliates must comply with the restrictions and requirements of
Rule 144, other than the one-year holding period requirement, in order to sell
shares of common stock which are not restricted securities.

   Under Rule 144(k), a person who is not an affiliate and has not been an
affiliate for at least three months prior to the sale and who has beneficially
owned shares for at least two years may resell these shares without compliance
with the foregoing requirements. In meeting the one- and two-year holding
periods described above, a holder of shares can include the holding periods of
a prior owner who was not an affiliate. The one- and two-year holding periods
described above do not begin to run until the full purchase price or other
consideration is paid by the person acquiring the shares from the issuer or an
affiliate.

   Rule 701 provides that currently outstanding shares of common stock
acquired under our employee compensation plans may be resold beginning 90 days
after the date of this prospectus (1) by persons, other than affiliates,
subject only to the manner of sale provisions of Rule 144, and (2) by
affiliates under Rule 144 without compliance with its one-year minimum holding
period, subject to certain limitations.

Lock-up Agreements

   Subject to limited exceptions, our executive officers, directors, and
stockholders, and most of our optionholders have agreed that, without the
prior written consent of Morgan Stanley & Co. Incorporated, they will not,
during the period ending 180 days after the date of this prospectus, directly
or indirectly, sell, offer, contract or grant any option to sell, pledge,
transfer, establish an open put equivalent position, or otherwise dispose of
any shares of common stock, options or warrants to acquire shares of common
stock, or securities

                                      54
<PAGE>

exchangeable or exerciseable for or convertible into shares of common stock
currently or hereafter owned either of record or beneficially, or publicly
announce their intention to do any of the foregoing. For more information on
these restrictions, see "Underwriting."

Stock Options

   As of April 30, 2000, approximately      shares of common stock were
issuable pursuant to vested options or pursuant to other rights granted under
our 1993 incentive stock option plan. In addition, we expect to grant to some
of our employees and directors upon completion of this offering options
exercisable to purchase up to     shares of our common stock. All of such
shares issuable upon the exercise of options that are exercisable within 180
days following this offering are subject to lock-up agreements with the
underwriters.

   We intend to file a registration statement on Form S-8 under the Securities
Act, following the date of this prospectus, to register up to      shares of
common stock issuable under our stock plans, including the shares of common
stock subject to outstanding options as of April 30, 2000. This registration
statement is expected to become effective upon filing.

Registration Rights

   After this offering, the holders of approximately      shares of common
stock and rights to acquire common stock will be entitled to rights with
respect to the registration of their shares under the Securities Act. Under
the terms of the agreement between us and the holders of these registrable
securities, if we propose to register any of our securities under the
Securities Act, either for our own account or for the account of other
security holders exercising registration rights, these holders are entitled to
notice of the registration and are entitled to include shares of their common
stock in the registration. Additionally, these holders are entitled to demand
registration rights pursuant to which they may require us on up to two
occasions to file a registration statement under the Securities Act at our
expense with respect to their shares of common stock, and we are required to
use our commercially reasonable best efforts to effect the registration. All
of these registration rights are subject to typical conditions and
limitations, among them the right of the underwriters of an offering to limit
the number of shares included in the registration and our right not to effect
a requested registration within six months following this offering or within
three months following any subsequent offering of our securities pursuant to a
registration statement filed with the Securities and Exchange Commission.

                                      55
<PAGE>


                               UNDERWRITERS

   Under the terms and subject to the conditions contained in an underwriting
agreement dated the date of this prospectus, the underwriters named below, for
whom Morgan Stanley & Co. Incorporated,                   , and
                      are acting as representatives, have severally agreed to
purchase, and OPNET has agreed to sell to them, severally, the number of
shares of common stock indicated below:

<TABLE>
<CAPTION>
                                                                          Number
                                                                            of
Underwriter                                                               Shares
- -----------                                                               ------
<S>                                                                       <C>
Morgan Stanley & Co. Incorporated........................................
                                                                           ----
  Total .................................................................
                                                                           ====
</TABLE>

   The underwriters are offering the shares of common stock subject to their
acceptance of the shares from OPNET and subject to prior sale. The
underwriting agreement provides that the obligations of the several
underwriters to pay for and accept delivery of the shares of OPNET's common
stock offered by this prospectus are subject to the approval of certain legal
matters by their counsel and to certain other conditions. The underwriters are
obligated to take and pay for all of the shares of common stock offered by
this prospectus if any such shares are taken. However, the underwriters are
not required to take or pay for the shares covered by the underwriters' over-
allotment option described below.

   The underwriters initially propose to offer part of the shares of common
stock directly to the public at the public offering price set forth on the
cover page of this prospectus and part to dealers at a price that represents a
concession not in excess of $       a share under the public offering price.
Any underwriter may allow, and dealers may reallow, a concession not in excess
of $        a share to other underwriters or to other dealers. After the
initial offering of the shares of common stock, the offering price and other
selling terms may from time to time be varied by the representatives.

   OPNET has granted to the underwriters an option, exercisable for 30 days
from the date of this prospectus, to purchase up to an aggregate of
additional shares of common stock at the public offering price set forth on
the cover page of this prospectus, less underwriting discounts and
commissions. The underwriters may exercise this option solely for the purpose
of covering over-allotments, if any, made in connection with the offering of
the shares of common stock offered by this prospectus. To the extent this
option is exercised, each underwriter will become obligated, subject to
specified conditions, to purchase approximately the same percentage of
additional shares of common stock as the number set forth next to the
underwriter's name in the preceding table bears to the total number of shares
of common stock set forth next to the names of all underwriters in the
preceding table. If the underwriters' option is exercised in full, the total
price to the public would be $         , the total underwriters' discounts and
commissions would be $          and total proceeds to OPNET would be $
 .

   The underwriters have informed OPNET that they do not intend sales to
discretionary accounts to exceed five percent of the total number of shares of
common stock offered by them.

   OPNET has filed an application for its common stock to be quoted on the
Nasdaq National Market under the symbol "OPNT."

                                      56
<PAGE>


   Each of OPNET and its directors, executive officers, and some of its other
stockholders have agreed that, without the prior written consent of Morgan
Stanley & Co. Incorporated on behalf of the underwriters, it will not, during
the period ending 180 days after the date of this prospectus:

  .  offer, pledge, sell, contract to sell, sell any option or contract to
     purchase, purchase any option or contract to sell, grant any option,
     right or warrant to purchase, lend, or otherwise transfer or dispose of
     directly or indirectly, any shares of common stock or any securities
     convertible into or exercisable or exchangeable for common stock; or

  .  enter into any swap or other arrangement that transfers to another, in
     whole or in part, any of the economic consequences of ownership of the
     common stock,

whether any transaction described above is to be settled by delivery of shares
of common stock or other securities, in cash or otherwise.

   The restrictions described in this paragraph do not apply to:

  .  the sale of shares to the underwriters;

  .  the issuance by OPNET of shares of common stock upon the exercise of an
     option or a warrant or the conversion of a security outstanding on the
     date of this prospectus of which the underwriters have been advised in
     writing; or

  .  transactions by any person other than OPNET relating to shares of common
     stock or other securities acquired in open market transactions after the
     completion of the offering of the shares.

   In order to facilitate this offering, the underwriters may engage in
transactions that stabilize, maintain or otherwise affect the price of the
shares of common stock. Specifically, the underwriters may over-allot in
connection with the offering, creating a short position in the common stock
for their own account. In addition, to cover over-allotments or to stabilize
the price of the common stock, the underwriters may bid for, and purchase,
shares of common stock in the open market. Finally, the underwriting syndicate
may reclaim selling concessions allowed to an underwriter or a dealer for
distributing the common stock in the offering, if the syndicate repurchases
previously distributed common stock in transactions to cover syndicate short
positions, in stabilization transactions or otherwise. The underwriters have
reserved the right to reclaim selling concessions in order to encourage
underwriters and dealers to distribute the common stock for investment, rather
than for short-term profit taking. Increasing the proportion of the offering
held for investment may reduce the supply of common stock available for short-
term trading. Any of these activities may stabilize or maintain the market
price of the common stock above independent market levels. The underwriters
are not required to engage in these activities, and may end any of these
activities at any time.

   OPNET and the underwriters have agreed to indemnify each other against a
variety of liabilities, including liabilities under the Securities Act.

   OPNET has agreed to pay its printing, legal, accounting and other expenses
relating to the offering, which it estimates to be $       .

Directed Share Program

   At the request of OPNET, the underwriters have reserved for sale, at the
initial offering price, up to      shares of the common stock offered hereby
for OPNET's directors, officers, employees, business associates, and related
persons. The number of shares of common stock available for sale to the
general public will be reduced to the extent such persons purchase such
reserved shares. Any reserved shares which are not so purchased will be
offered by the underwriters to the general public on the same basis as the
other shares offered hereby.

                                      57
<PAGE>


Pricing of the Offering

   Prior to this offering, there has been no public market for the common
stock. The initial public offering price will be determined by negotiations
between OPNET and the representatives. Among the factors to be considered in
determining the initial public offering price will be the future prospects of
OPNET and its industry in general, sales, earnings, and certain other
financial operating information of OPNET in recent periods, and the price-
earnings ratios, price-sales ratios, market prices of securities and certain
financial and operating information of companies engaged in activities similar
to those of OPNET. The estimated initial public offering price range set forth
on the cover page of this preliminary prospectus is subject to change as a
result of market conditions and other factors.

                                      58
<PAGE>

                                 LEGAL MATTERS

   The validity of the shares of common stock we are offering will be passed
upon for us by Hale and Dorr LLP, Washington, D.C. Certain legal matters in
connection with this offering will be passed upon for the underwriters by
Morrison & Foerster LLP, New York, New York.

                                    EXPERTS

   The financial statements as of March 31, 1999 and 2000 and for each of the
three years in the period ended March 31, 2000 included in this prospectus
have been audited by Deloitte & Touche LLP, independent auditors, as stated in
their report appearing herein, and have been so included in reliance upon the
report of such firm given upon their authority as experts in accounting and
auditing.

                      WHERE YOU CAN FIND MORE INFORMATION

   We have filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act with respect to the common
stock we propose to sell in this offering. This prospectus, which constitutes
part of the registration statement, does not contain all of the information
set forth in the registration statement. For further information about us and
the common stock we propose to sell in this offering, we refer you to the
registration statement and the exhibits and schedules filed as a part of the
registration statement. Statements contained in this prospectus as to the
contents of any contract or other document filed as an exhibit to the
registration statement are summaries of the material provisions of the
contract or document. If a contract or document has been filed as an exhibit
to the registration statement, we refer you to the copy of the contract or
document that has been filed. The registration statement may be inspected
without charge at the principal office of the Commission in Washington, D.C.
and copies of all or any part of which may be inspected and copied at the
public reference facilities maintained by the Commission at 450 Fifth Street,
N.W., Judiciary Plaza, Room 1024, Washington, D.C. 20549, and at the
Commission's regional offices located at Citicorp Center, 500 West Madison
Street, Suite 1400, Chicago, Illinois 60661-2511 and 7 World Trade Center,
Suite 1300, New York, New York 10048. Copies of such material can also be
obtained at prescribed rates by mail from the Public Reference Section of the
Commission at 450 Fifth Street, N.W., Washington, D.C. 20549. The Commission's
toll-free number is 800-SEC-0330. In addition, the Commission maintains a Web
site (http://www.sec.gov) that contains reports, proxy and information
statements and other information regarding registrants that file
electronically with the Commission.
<TABLE>
<S>      <C>
</TABLE>

                                      59
<PAGE>

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                           Page
                                                                           ----
<S>                                                                        <C>
Independent Auditors' Report.............................................  F-2
Consolidated Balance Sheets as of March 31, 1999 and 2000................  F-3
Consolidated Statements of Operations for the years ended March 31, 1998,
 1999, and 2000..........................................................  F-4
Consolidated Statements of Cash Flows for the years ended March 31, 1998,
 1999, and 2000..........................................................  F-5
Consolidated Statements of Changes in Stockholders' Equity for the years
 ended March 31, 1998, 1999 and 2000.....................................  F-6
Notes to Consolidated Financial Statements...............................  F-7
</TABLE>

                                      F-1
<PAGE>

                         INDEPENDENT AUDITORS' REPORT

To the Board of Directors and Stockholders of
OPNET Technologies, Inc.
Washington, D.C.

   We have audited the accompanying consolidated balance sheets of OPNET
Technologies, Inc., as of March 31, 1999 and 2000, and the related
consolidated statements of operations, stockholders' equity, and cash flows
for each of the three years in the period ended March 31, 2000. These
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.

   We conducted our audits in accordance with auditing standards generally
accepted in the United States of America. Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the
financial statements are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements. An audit also includes assessing the accounting
principles used and significant estimates made by management, as well as
evaluating the overall financial statement presentation. We believe that our
audits provide a reasonable basis for our opinion.

   In our opinion, such consolidated financial statements present fairly, in
all material respects, the financial position of the Company as of March 31,
1999 and 2000, and the results of its operations and its cash flows for each
of the three years in the period ended March 31, 2000, in conformity with
accounting principles generally accepted in the United States of America.

DELOITTE & TOUCHE LLP

McLean, Virginia

April 19, 2000

                                      F-2
<PAGE>

                            OPNET TECHNOLOGIES, INC.

                          Consolidated Balance Sheets
                     (in thousands, except per share data)

<TABLE>
<CAPTION>
                                                               March 31, 2000
                                                              ------------------
                                                                       Pro Forma
                                                    March 31,          Unaudited
                                                      1999    Actual   (Note 1)
                                                    --------- -------  ---------
                      ASSETS
<S>                                                 <C>       <C>      <C>
Current assets:
 Cash and cash equivalents........................   $ 6,414  $ 8,765   $ 8,765
 Accounts receivable, net of $185 and $100 in
  allowance for doubtful accounts at March 31,
  1999 and 2000...................................     3,080    3,119     3,119
 Refundable income taxes..........................       417      476       476
 Deferred offering costs..........................       --       400       400
 Deferred income taxes............................       105      101       101
 Prepaid expenses and other current assets........       167      376       376
                                                     -------  -------   -------
 Total current assets.............................    10,183   13,237    13,237
                                                     -------  -------   -------
Deferred income taxes.............................        31       99        99
Property and equipment, net.......................     1,734    2,272     2,272
Intangible assets, net of $42 and $542 in
 accumulated amortization at March 31, 1999 and
 2000.............................................       958      458       458
Other assets:
 Deposits.........................................        42       62        62
 Loan to officer..................................       --       231       231
 Purchased software, net of accumulated
  amortization of $184 and $223 at March 31, 1999
  and 2000........................................       257      354       354
                                                     -------  -------   -------
  Total assets....................................   $13,205  $16,713   $16,713
                                                     =======  =======   =======
<CAPTION>
       LIABILITIES AND STOCKHOLDERS' EQUITY
<S>                                                 <C>       <C>      <C>
Current liabilities:
 Accounts payable.................................   $   163  $   170   $   170
 Accrued liabilities..............................     1,129    2,479     2,479
 Deferred revenue.................................     2,085    3,476     3,476
                                                     -------  -------   -------
 Total current liabilities........................     3,377    6,125     6,125
Non-current liabilities:
 Deferred rent....................................        40       30        30
 Deferred revenue.................................       117      142       142
                                                     -------  -------   -------
 Total non-current liabilities....................       157      172       172
Commitments and contingencies (note 8)
Series A redeemable convertible preferred stock,
 par value $0.001--160 shares authorized, 145
 issued and outstanding at March 31, 1999 and
 2000, liquidation preference - $48.40 per share..     6,934    6,948       --
Stockholders' equity:
 Preferred stock--par value $0.001; 400 shares
  authorized; 160 shares designated as Series A
  (above), 145 issued and outstanding.............       --       --        --
 Common stock--par value $0.001; 20,000 shares
  authorized; 11,206, 11,386 and 12,834 shares
  issued at March 31, 1999 and 2000 and March 31,
  2000 pro forma, respectively; 7,121, 7,301 and
  8,749 shares outstanding at March 31, 1999 and
  2000 and March 31, 2000 pro forma,
  respectively....................................        11       11        13
 Additional paid-in capital.......................       172      629     7,575
 Deferred compensation............................       --      (287)     (287)
 Retained earnings................................     6,564    7,125     7,125
 Treasury stock--4,085 shares at March 31, 1999
  and 2000 .......................................    (4,010)  (4,010)   (4,010)
                                                     -------  -------   -------
 Total stockholders' equity.......................     2,737    3,468    10,416
                                                     -------  -------   -------
  Total liabilities and stockholders' equity......   $13,205  $16,713   $16,713
                                                     =======  =======   =======
</TABLE>

                See notes to consolidated financial statements.

                                      F-3
<PAGE>

                            OPNET TECHNOLOGIES, INC.

                     Consolidated Statements of Operations
                     (in thousands, except per share data)

<TABLE>
<CAPTION>
                                                     Year Ended March 31,
                                                    -------------------------
                                                     1998     1999     2000
                                                    -------  -------  -------
<S>                                                 <C>      <C>      <C>
Revenues:
  Software licenses................................ $ 7,875  $ 6,715  $10,577
  Services.........................................   4,054    5,288    8,658
                                                    -------  -------  -------
    Total revenues.................................  11,929   12,003   19,235
                                                    -------  -------  -------
Cost of revenues:
  Software licenses................................     435      133      728
  Services.........................................     980    1,249    2,875
                                                    -------  -------  -------
    Total cost of revenues.........................   1,415    1,382    3,603
                                                    -------  -------  -------
Gross profit.......................................  10,514   10,621   15,632
Operating expenses:
  Research and development.........................   3,190    4,850    5,696
  Sales and marketing..............................   3,398    4,056    7,510
  General and administrative.......................   1,336    1,984    2,093
                                                    -------  -------  -------
    Total operating expenses.......................   7,924   10,890   15,299
                                                    -------  -------  -------
Income (loss) from operations......................   2,590     (269)     333
Interest and other income..........................     319      376      414
                                                    -------  -------  -------
Income before provision (benefit) for income
 taxes.............................................   2,909      107      747
Provision (benefit) for income taxes...............   1,134     (100)     172
                                                    -------  -------  -------
Net income ........................................   1,775      207      575
Accretion of transaction costs on redeemable
 convertible preferred stock.......................      (9)     (14)     (14)
                                                    -------  -------  -------
Net income applicable to common shares............. $ 1,766  $   193  $   561
                                                    =======  =======  =======
Basic net income applicable per common share....... $   .24  $   .03  $   .08
                                                    =======  =======  =======
Diluted net income per common share................ $   .21  $   .02  $   .06
                                                    =======  =======  =======
</TABLE>

                See notes to consolidated financial statements.

                                      F-4
<PAGE>

                            OPNET TECHNOLOGIES, INC.

                     Consolidated Statements of Cash Flows
                                 (in thousands)

<TABLE>
<CAPTION>
                                                      Year Ended March 31,
                                                     -------------------------
                                                      1998     1999     2000
                                                     -------  -------  -------
<S>                                                  <C>      <C>      <C>
Cash flows from operating activities:
 Net income .......................................  $ 1,775  $   207  $   575
 Adjustments to reconcile net income to net cash
  provided by operating activities:
   Accreted income on investments..................       (6)     --       --
   Expense related to employee stock options.......      --       --        36
   Depreciation and amortization...................      346      568    1,229
   Write-off of property and software..............       48        3      --
   Deferred income taxes...........................      (41)    (414)     (64)
   Changes in assets and liabilities:
     Accounts receivable...........................      (42)    (939)     (39)
     Loans to employees............................      --       --      (231)
     Prepaid expenses and other current assets.....     (105)      46     (209)
     Refundable income taxes.......................     (330)     (38)     (59)
     Deposits......................................      (15)     --       (20)
     Accounts payable..............................      (10)      54        7
     Accrued liabilities...........................      157      434    1,496
     Deferred revenue..............................      522      399    1,416
     Deferred rent.................................       (5)      (8)     (10)
                                                     -------  -------  -------
      Net cash provided by operating activities....    2,294      312    4,127
                                                     -------  -------  -------
Cash flows from investing activities:
 Maturities of securities available for sale.......      193      206      --
 Purchase of intangibles...........................      --      (500)    (500)
 Purchase of software..............................     (102)    (184)    (197)
 Proceeds from sale of property and equipment......      --         2      --
 Purchase of property and equipment................     (884)    (713)  (1,167)
                                                     -------  -------  -------
      Net cash used in investing activities........     (793)  (1,189)  (1,864)
                                                     -------  -------  -------
Cash flows from financing activities:
 Net proceeds from sale of redeemable convertible
  preferred stock..................................    6,911      --       --
 Purchase of treasury stock........................   (3,363)     --       --
 Proceeds from sale of common stock................      --        60      --
 Proceeds from exercise of common stock options....      --         4      134
 Costs incurred for intended initial public
  offering.........................................      --       --       (46)
                                                     -------  -------  -------
      Net cash provided by financing activities....    3,548       64       88
                                                     -------  -------  -------
Net increase (decrease) in cash and cash
 equivalents.......................................    5,049     (813)   2,351
Cash and cash equivalents, beginning of year.......    2,178    7,227    6,414
                                                     -------  -------  -------
Cash and cash equivalents, end of year.............  $ 7,227  $ 6,414  $ 8,765
                                                     =======  =======  =======
Supplemental disclosure of cash flow information:
 Cash paid during the year for income taxes........  $ 1,502  $   353  $   566
                                                     =======  =======  =======
Supplemental disclosure of non cash activities:
 Obligation assumed for acquired intangibles.......  $   --   $   500  $   --
                                                     =======  =======  =======
 Accrued offering costs............................  $   --   $   --   $   354
                                                     =======  =======  =======
</TABLE>

                See notes to consolidated financial statements.

                                      F-5
<PAGE>

                            OPNET TECHNOLOGIES, INC.
           Consolidated Statements of Changes in Stockholders' Equity
                                 (in thousands)

<TABLE>
<CAPTION>
                                      Common Stock             Treasury Stock
                          ------------------------------------ --------------
                                                    Additional                                           Total
                          Shares   Shares            Paid-In                     Deferred   Retained Stockholders'
                          Issued Outstanding Amount  Capital   Shares Amount   Compensation Earnings    Equity
                          ------ ----------- ------ ---------- ------ -------  ------------ -------- -------------
<S>                       <C>    <C>         <C>    <C>        <C>    <C>      <C>          <C>      <C>
Balance, March 31,
 1997...................  11,173    7,783     $11     $  108   3,390  $  (647)    $ --       $4,605     $ 4,077
 Net income.............                                                                      1,775       1,775
 Purchase of treasury
  stock.................             (695)                       695   (3,363)                           (3,363)
 Accretion of
  transaction costs on
  redeemable
  convertible preferred
  stock ................                                                                         (9)         (9)
                          ------    -----     ---     ------   -----  -------     -----      ------     -------
Balance, March 31,
 1998...................  11,173    7,088      11        108   4,085   (4,010)      --        6,371       2,480
 Net income.............                                                                        207         207
 Share options
  exercised.............      13       13                  4                                                  4
 Common shares issued...      20       20                 60                                                 60
 Accretion of
  transaction costs on
  redeemable convertible
  preferred stock.......                                                                        (14)        (14)
                          ------    -----     ---     ------   -----  -------     -----      ------     -------
Balance, March 31,
 1999...................  11,206    7,121      11        172   4,085   (4,010)      --        6,564       2,737
 Net income ............                                                                        575         575
 Share options
  exercised.............     180      180                134                                                134
 Deferred compensation
  on employee stock
  options...............                                 323                       (323)                    --
 Amortization of
  deferred compensation
  on employee stock
  options...............                                                             36                      36
 Accretion of
  transaction costs on
  redeemable convertible
  preferred stock.......                                                                        (14)        (14)
                          ------    -----     ---     ------   -----  -------     -----      ------     -------
Balance, March 31,
 2000...................  11,386    7,301      11        629   4,085   (4,010)     (287)      7,125       3,468
Pro forma conversion of
 redeemable convertible
 preferred stock to
 common stock
 (unaudited)............   1,448    1,448       2      6,946                                              6,948
                          ------    -----     ---     ------   -----  -------     -----      ------     -------
Pro forma balance, March
 31, 2000 (unaudited)...  12,834    8,749     $13     $7,575   4,085  $(4,010)    $(287)     $7,125     $10,416
                          ======    =====     ===     ======   =====  =======     =====      ======     =======
</TABLE>
                See notes to consolidated financial statements.

                                      F-6
<PAGE>

                           OPNET TECHNOLOGIES, INC.

                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

1. ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES

   The predecessor of OPNET Technologies, Inc. ("OPNET" or the "Company") was
incorporated in the State of Maryland in 1986. The Company was incorporated in
the State of Delaware in 1988. The Company's predecessor filed articles of
dissolution with the State of Maryland in 1990. The Company's wholly owned
subsidiary, MIL 3 International Limited, was incorporated in Barbados in June
1998. During fiscal year 2000, the Company changed its name from MIL3, Inc. to
OPNET Technologies, Inc.

   The Company provides predictive network management software solutions that
enable its customers to optimize the performance and maximize the availability
of networks and applications. The Company's product suite consists of three
primary software products: OPNET Modeler, OPNET IT DecisionGuru, and OPNET
Netbiz. The Company sells its OPNET suite of products to service providers,
including telecommunications carriers, Internet service providers, application
service providers, large and medium-sized organizations, and network equipment
manufacturers. The Company markets its product suite in North America
primarily through a direct sales force and, to a lesser extent, several
resellers and original equipment manufacturers. Internationally, the Company
markets its products primarily through third-party distributors.

  (a) Principles of Consolidation--The financial statements include the
      results of OPNET Technologies, Inc. and its wholly owned subsidiary,
      MIL 3 International Limited. All significant intercompany accounts and
      transactions have been eliminated in consolidation.

  (b) Estimates and Assumptions--The preparation of financial statements in
      conformity with GAAP requires management to make estimates and
      assumptions. These estimates and assumptions affect the reported
      amounts of assets and liabilities and the disclosure of contingent
      assets and liabilities at the date of the financial statements, as well
      as the reported amounts of revenues and expenses during the reporting
      period. Actual results could differ from those estimates.

  (c) Cash and Cash Equivalents--The Company considers deposits in banks and
      all highly liquid investments with an original maturity of three months
      or less to be cash equivalents. At March 31, 1999 and 2000, the
      Company's investments consisted of money market accounts with banks and
      brokerage firms, and overnight reverse repurchase agreements; their
      carrying amounts approximated fair values.

  (d) Marketable Securities--The Company has classified its marketable
      securities as available-for-sale, as defined in SFAS No. 115,
      "Accounting for Certain Investments in Debt and Equity Securities."




  (e) Accounts Receivable--Accounts receivable includes $219,000 and $224,000
      of unbillable accounts receivable as of March 31, 1999 and 2000, which
      have been recorded as revenue from fixed-price consulting agreements
      using the percentage of completion method of accounting.

  (f) Concentration of Credit Risk--Financial instruments that potentially
      subject the Company to a concentration of credit risk consist
      principally of cash and accounts receivable. The Company generally does
      not require collateral on accounts receivable as the majority of its
      customers are large, well-established companies, or government
      entities.

    The Company maintains its cash balance at several financial
    institutions, including a brokerage firm. The Federal Deposit Insurance
    Corporation insures the bank accounts up to $100,000. Although balances
    exceed that amount, the Company has not experienced any losses in such
    accounts and believes it is not exposed to any significant credit risk
    to cash.

  (g) Software Development Costs--Development costs incurred in the research
      and development of new software products and enhancements to existing
      software products are expensed as incurred until technological
      feasibility has been established. The Company considers technological
      feasibility to be established when all planning, designing, coding, and
      testing has been completed according to design

                                      F-7
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

     specifications. After technological feasibility has been established,
     any additional costs would be capitalized in accordance with Statement
     of Financial Accounting Standards No. 86, "Accounting for the Costs of
     Computer Software to be Sold, Leased, or Otherwise Marketed." Through
     March 31, 2000, software development has been substantially completed
     concurrently with the establishment of technological feasibility, and,
     accordingly, no costs have been capitalized to date.

  (h) Pro Forma Presentation--Under the terms of the Company's agreements
      with the holders of the redeemable convertible preferred stock (See
      Note 6), all of such preferred stock will be converted automatically
      into shares of common stock upon the closing of the Company's initial
      public offering. The pro forma balance sheet information at March 31,
      2000 reflects the conversion of the Series A stock into 1,447,846
      shares of common stock as if the conversion occurred on March 31, 2000.

  (i) Purchased Software--Purchased software is amortized on a straight-line
      basis, generally over five years. Amortization expense for fiscal years
      1998, 1999 and 2000 was $44,000, $76,000 and $100,000, respectively.

  (j) Property and Equipment--Property and equipment are stated at cost.
      Depreciation on property and equipment is computed on a straight-line
      basis over the estimated useful lives of the assets, generally ranging
      from five to seven years. Leasehold improvements are depreciated over
      the shorter of the estimated useful life of the assets or the term of
      the related lease. Repairs and maintenance are expensed as incurred;
      major improvements and betterments are capitalized.

  (k) Intangible Assets--Intangible assets consist of marketing support
      rights that were acquired from another company under a two-year
      contract. These costs are being amortized over the two-year contract
      period using the straight-line method of amortization.

  (l) Impairment of Long-Lived Assets--The Company reviews its long-lived
      assets, including property and equipment, for impairment whenever
      events or changes in circumstances indicate that the carrying amounts
      of the assets may not be fully recoverable. In the event an evaluation
      of recoverability is required, the estimated future undiscounted net
      cash flows of the assets would be compared to the carrying amounts of
      the assets to determine if a write-down is required.

  (m) Revenue Recognition--The Company derives revenues principally from two
      sources, product license fees for the use of the OPNET technology-based
      software products and service fees.

     The Company recognizes revenue based on the provisions of Statement of
     Position ("SOP") No. 97-2, Software Revenue Recognition (as amended by
     SOP No. 98-4 and SOP 98-9) and SOP 81-1, Accounting for Performance of
     Construction-Type and Certain Production-Type Contracts. Software
     license revenues consist of license sales of software products and
     royalty income. Software license revenues are recognized upon persuasive
     evidence of an arrangement, delivery and acceptance of the software,
     determination that there are no significant modifications required and
     when collection of a fixed or determinable license fee is considered
     probable. Where significant modifications are required, software license
     revenues are recognized along with consulting fees on a percentage-of-
     completion basis as the modifications are performed. Royalty income is
     derived from the sale of company products by third parties, whereby the
     third party distributes the product under its own name. The Company
     receives a stipulated percentage of all such sales. Royalty income is
     recognized at the time at which the sale is communicated to the Company
     by the third party. The Company's policy is not to allow returns because
     it allows its customers to evaluate the Company's software products
     before purchases. The Company does not recognize revenue until after
     customer delivery and acceptance.

     Service revenues consist of fees from maintentance and technical support
     agreements, consulting services and training. Service revenues from
     implementation and customization services that are essential to the
     customer's use of the software are bundled with the software and the
     entire

                                      F-8
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

     arrangement is recognized under the percentage-of-completion method.
     Percentage-of-completion is measured by the percentage of implementation
     and customization hours incurred to date to estimated total
     implementation hours. In addition, revenues from consulting services are
     also measured by the relationship of hours incurred to the estimated
     total hours of the contract. Revisions in estimated hours are reflected
     in the accounting period in which the required revisions become known.
     Anticipated losses on contracts are charged to income in their entirety
     when such losses become evident. Training is provided on a daily-fee
     basis with revenue recognized as the services are performed. Maintenance
     agreements provide for technical support and periodic unspecified
     product upgrades. Maintenance revenue is deferred and recognized on a
     straight-line basis over the term of the agreement; amounts received in
     advance of revenue recognition are classified as deferred revenue.

     The Company sells off-the-shelf software licenses and maintenance to
     distributors at a predetermined price. The Company provides technical
     support and maintenance to the distributors and the distributors provide
     support to the end customer. Revenue on these sales is recorded in the
     same manner as all other software license and maintenance sales. These
     sales are not contingent upon the distributors' resale of the software
     to the end user.

  (n) Income Taxes--The income tax provision includes income taxes currently
      payable plus the net change during the year in deferred tax assets or
      liabilities. Deferred tax assets and liabilities reflect the
      differences between the carrying value under generally accepted
      accounting principles and tax basis of assets and liabilities using
      enacted tax rates for the period in which the difference is expected to
      reverse.

  (o) Advertising Costs--Advertising costs are expensed as incurred and
      include $156,000, $373,000 and $533,000 for the fiscal years ended
      March 31, 1998, 1999 and 2000, respectively.

  (p) Foreign Currency Transactions--Revenues denominated in foreign
      currencies are translated at the prevailing exchange rate at the time
      of the transaction. Gain or loss on foreign exchange is reported in the
      Consolidated Statements of Operations.

  (q) Net Income Per Share--Basic net income per share has been computed
      using the weighted average number of common shares outstanding during
      the period; diluted net income per share includes dilutive stock
      options and convertible preferred stock.

  (r) Stock-Based Compensation--In 1993, the Company instituted an Incentive
      Stock Option Plan (the "1993 Plan"), intended to qualify as such under
      the provisions of Section 422 of the Internal Revenue Code of 1986, as
      amended. In addition, during fiscal year 1999, the Company began
      issuing nonqualified stock options. The Company grants stock options
      for a fixed number of shares to employees, with an exercise price not
      less than the fair market value of the shares, as determined by the
      1993 Plan committee, on the date of the grant.

    The Company accounts for stock option grants in accordance with APB
    Opinion No. 25, "Accounting for Stock Issued to Employees." In October
    1995, the FASB issued Statement of Financial Accounting Standards No.
    123, "Accounting for Stock-Based Compensation" (SFAS 123). As permitted
    by SFAS 123, the Company accounts for stock-based compensation in
    accordance with APB Opinion No. 25, and accordingly, recognizes
    compensation expense for fixed stock option grants only when the
    exercise price is less than the fair value of the shares on the date of
    the grant. Pro forma net income and pro forma net income per share
    disclosures are provided for employee stock option grants made in fiscal
    years 1998, 1999 and 2000 as if the fair-value-based method defined in
    SFAS 123 had been applied (see Note 10).

  (s) Redeemable Convertible Preferred Stock--The Company accretes the
      increase in the redemption value of its Series A redeemable convertible
      preferred stock through a charge to retained earnings based upon the
      redemption dates prescribed in the Amended and Restated Certificate of
      Incorporation. The period

                                      F-9
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

     of accretion began on the September 1997 issuance date and ends on the
     prescribed redemption dates beginning October 2002 and continuing
     through October 2005.

  (t) Reclassifications--Certain reclassifications have been made to the
      prior-year financial statements to conform to the current-year
      presentation.

  (u) Recently Issued Accounting Pronouncements--In June 1998, the Financial
      Accounting Standards Board issued Statement of Financial Accounting
      Standard No. 133, "Accounting for Derivative Instruments and Hedging
      Activities," which establishes accounting and reporting standards for
      derivative instruments and hedging activities. As amended by Statement
      of Financial Accounting Standard No. 137, this standard will be
      effective for the Company for the fiscal years and quarters beginning
      after March 31, 2001, and requires that an entity recognize all
      qualifying derivatives as either assets or liabilities in the statement
      of financial position and measure those instruments at fair value. The
      Company has not completed the process of evaluating the impact of this
      statement and is therefore unable to disclose the potential impact that
      implementing SFAS No. 133 will have on its financial position or
      results of operations.

    In December 1999, the Securities and Exchange Commission issued Staff
    Accounting Bulletin ("SAB") No. 101--Revenue Recognition in Financial
    Statements. This SAB expresses the SEC's views on applying generally
    accepted accounting principles to revenue recognition in financial
    statements. The Company does not expect the application of this SAB to
    have a material impact on its financial statements.

    In March 2000, the Financial Accounting Standards Board issued FASB
    Interpretation No. 44, "Accounting for Certain Transactions Involving
    Stock Compensation, an Interpretation of APB Opinion No. 25." With the
    exception of certain provisions which require earlier application, this
    interpretation is effective for all applicable transactions beginning
    July 1, 2000. The Company does not expect that the adoption of this
    Interpretation will have a material impact on its financial statements.

2. INTANGIBLE ASSETS

   Under the terms of an agreement, effective March 1, 1999, the Company
acquired a new distribution channel and rights to a royalty stream, as well as
marketing support rights, from another company, for $1.0 million. The
agreement is for a two-year period and may be extended by mutual agreement.
The Company paid $500,000 in cash at closing and the balance was paid during
fiscal year 2000.

   Under the terms of the agreement, the other company agreed to refund the
full $1.0 million if certain conditions are not met. The Company is amortizing
the cost over the two-year minimum period, using the straight-line method.

3. PROPERTY AND EQUIPMENT

   At March 31, 1999 and 2000, property and equipment were as follows:

<TABLE>
<CAPTION>
                                                          1999         2000
                                                       -----------  -----------
   <S>                                                 <C>          <C>
   Computer equipment................................. $ 2,406,000  $ 2,584,000
   Office furniture and equipment.....................     735,000    1,078,000
                                                       -----------  -----------
     Total............................................   3,141,000    3,662,000
   Less: accumulated depreciation.....................  (1,407,000)  (1,390,000)
                                                       -----------  -----------
   Property and equipment--net........................ $ 1,734,000  $ 2,272,000
                                                       ===========  ===========
</TABLE>

   Depreciation expense for fiscal years 1998, 1999, and 2000 was $302,000,
$450,000 and $729,000, respectively.


                                     F-10
<PAGE>

                            OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                 YEARS ENDED MARCH 31, 1998, 1999 AND 2000

4. ACCRUED LIABILITIES

   Accrued liabilities consisted of the following at March 31, 1999 and 2000:

<TABLE>
<CAPTION>
                                                             1999       2000
                                                          ---------- ----------
   <S>                                                    <C>        <C>
   Accrued bonuses....................................... $  331,000 $1,247,000
   Accrued vacation......................................    178,000    278,000
   Accrued contractual payments..........................    500,000        --
   Accrued royalty payments..............................        --     272,000
   Accrued commissions...................................     45,000    206,000
   Accrued offering costs................................        --     354,000
   Other.................................................     75,000    122,000
                                                          ---------- ----------
     Total............................................... $1,129,000 $2,479,000
                                                          ========== ==========
</TABLE>

5. INCOME TAXES

   The components of the provision for income taxes for the years ended March
31, 1998, 1999 and 2000, were as follows:

<TABLE>
<CAPTION>
                                                  1998       1999       2000
                                               ----------  ---------  --------
   <S>                                         <C>         <C>        <C>
   Current provision:
     Federal.................................  $  876,000  $ 238,000  $158,000
     State...................................     299,000     76,000    78,000
                                               ----------  ---------  --------
       Total current provision...............   1,175,000    314,000   236,000
                                               ----------  ---------  --------
   Deferred (benefit) provision:
     Federal.................................     (31,000)  (323,000)  (69,000)
     State...................................     (10,000)   (91,000)    5,000
                                               ----------  ---------  --------
       Total deferred benefit................     (41,000)  (414,000)  (64,000)
                                               ----------  ---------  --------
       Total (benefit) provision for income
        taxes................................  $1,134,000  $(100,000) $172,000
                                               ==========  =========  ========
</TABLE>

   At March 31, 1999 and 2000, respectively, the components of the Company's
deferred tax assets and deferred tax liabilities were as follows:

<TABLE>
<CAPTION>
                                                             1999       2000
                                                           ---------  ---------
   <S>                                                     <C>        <C>
   Deferred tax assets:
     Accrued vacation expense............................. $  44,000  $  68,000
     Deferred revenue.....................................   495,000    361,000
     Deferred rent........................................    14,000      9,000
     Deferred tax credits.................................       --      85,000
     Other temporary differences..........................    92,000     31,000
                                                           ---------  ---------
       Total deferred tax assets..........................   645,000    554,000
                                                           ---------  ---------
   Deferred tax liabilities:
     Cash to accrual conversion...........................  (321,000)  (145,000)
     Accelerated depreciation.............................  (152,000)  (161,000)
     Other temporary differences..........................   (36,000)   (48,000)
                                                           ---------  ---------
       Total deferred tax liabilities.....................  (509,000)  (354,000)
                                                           ---------  ---------
       Net deferred tax assets............................ $ 136,000  $ 200,000
                                                           =========  =========
</TABLE>


                                      F-11
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

   The provision for income taxes for fiscal years 1998, 1999 and 2000 differs
from the amount computed by applying the statutory U.S. Federal income tax
rate to income before taxes as a result of the following:

<TABLE>
<CAPTION>
                                                               1998  1999   2000
                                                               ----  ----   ----
   <S>                                                         <C>   <C>    <C>
   Statutory U.S. Federal rate................................  34%    34%   34%
     Increase (decrease) in taxes resulting from:
       State income taxes--net of Federal benefit.............   7      7     7
       Tax credits............................................  (3)  (141)  (22)
       Other permanent differences--net.......................   1      7     4
                                                               ---   ----   ---
   Effective tax rate.........................................  39%   (93)%  23%
                                                               ===   ====   ===
</TABLE>

6. REDEEMABLE CONVERTIBLE PREFERRED STOCK

   On September 30, 1997, the Company entered into a Series A Redeemable
Convertible Preferred Stock Purchase Agreement (the "Agreement") with two
investors. The Company authorized 160,000 shares of the Series A Redeemable
Convertible Preferred Stock (the "Series A Preferred Stock") and issued and
sold 144,640 shares, $.001 par value, for $7,000,576. Each holder of Series A
Preferred Stock is entitled to vote on all matters to be taken before the
stockholders of the Company and is entitled to the number of votes equal to
the number of whole shares of Common Stock into which such holder's shares of
Series A Preferred Stock could be converted on the record date for the
determination of shareholders entitled to vote on such matter.

   Any share of the Series A Preferred Stock may, at the option of the holder,
be converted at any time into fully paid and nonassessable shares of Common
Stock. The number of shares of Common Stock to which a holder of Series A
Preferred Stock shall be entitled upon conversion shall be the product
obtained by multiplying the Applicable Conversion Rate by the number of shares
of Series A Preferred Stock being converted. The Conversion Rate is defined as
the quotient obtained by dividing the "Initial Purchase Price" of $48.40 by
the Applicable Conversion Value which (after giving effect to the Company's
10-for-1 common stock split) is $4.84 per share at March 31, 2000. The
Applicable Conversion Value may be adjusted from time to time upon certain
conditions such as sale of Common Stock, issuance of warrants, options, and
rights to Common Stock, and extraordinary Common Stock events.

   The holders of record of outstanding Series A Preferred Stock shall be
entitled to receive, out of any assets of the Company legally available
therefore, such dividends as may from time to time be declared by the
Company's board of directors. In the event of any liquidation, dissolution, or
winding up of the Company, whether voluntary or involuntary, before any
distribution may be made with respect to the Common Stock or any other series
of capital stock, holders of each outstanding share of Series A Preferred
Stock shall be entitled to be paid out of the assets of the Company available
for distribution to holders of the Company's capital stock of all classes, an
amount equal to the "Initial Purchase Price" of each share of Series A
Preferred Stock, as adjusted for any stock split or combination,
reclassification, or similar event (as so adjusted the "Liquidation Amount").
The "Initial Purchase Price" per share of the Series A Preferred Stock, as
issued as of September 30, 1997, is $48.40.

   The Series A Preferred Stock shall automatically be converted into Common
Stock upon the occurrence of a "Qualified Public Offering," which shall mean
an underwritten public offering of capital stock of the Company pursuant to an
effective registration statement under the Securities Act of 1933, as amended,
with gross proceeds in excess of $20,000,000 and an offering price per share
of such capital stock at least three times the then-existing applicable
conversion value of the Series A Preferred Stock.


                                     F-12
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

   At the written election of the holders of more than 50% of the then
outstanding shares of Series A Preferred Stock given during the thirty-day
period commencing on each of October 1, 2002, 2003, 2004, 2005, the Company
shall (1) redeem pro rata from all holders of Series A Preferred Stock within
60 days of its receipt of such election, 25% of the shares of Series A
Preferred Stock outstanding on October 1, 1997 or (2) redeem all outstanding
shares of Series A Preferred Stock concurrently with the occurrence of a
"liquidity event," which is defined as (1) the liquidation, winding up or
dissolution of the Company, (2) the sales of all or substantially all of the
assets of the Company, or (3) the merger or consolidation of the Company with
or into another entity. The redemption amount is based upon the Liquidation
Amount for purposes of these redemptions.

   Each outstanding share of Series A Preferred Stock must be redeemed by the
Company within the 60-day period following receipt by the Company of written
notice from the holders of more than 50% of the outstanding shares of such
class, given during the 12 month period commencing on October 1, 2005, at a
per share price equal to the higher of (a) the Liquidation Amount, or (b) the
fair market value of such share. The fair market value of the Series A
Preferred Stock shall be determined by negotiation between the Company and the
holders of the Series A Preferred Stock or by an independent appraisal.

   The difference between the carrying amounts of the Series A Preferred Stock
of $6,934,000 and $6,948,000 as of March 31, 1999 and 2000, respectively, and
the redemption amount of $7,001,000 based upon the liquidation amount,
represents the cost of issuance, which is being accreted pro rata over the
period beginning on the September 1997 issuance date and ending on the
prescribed redemption dates beginning October 2002 and continuing through
October 2005.

7. RELATED PARTY TRANSACTIONS

   The Company sells consulting services to a certain customer through another
company, which is wholly-owned by one of the executive officers of the
Company. Such sales totaled $20,000 during fiscal year 1998, $36,000 during
fiscal year 1999 and $98,000 during fiscal year 2000. The Company had no
accounts receivable balance due from the other company as of March 31, 1999
and 2000.

8. COMMITMENTS AND CONTINGENCIES

   OPNET leases office space under noncancelable operating leases. The leases
for office space contain escalation clauses that provide for increased rentals
based primarily on increases in real estate taxes, operating expenses, or the
average consumer price index. Total rent expense under all leases for fiscal
years 1998, 1999 and 2000 was $525,000, $677,000 and $710,000, respectively.
At March 31, 2000, future minimum lease payments required under noncancelable
leases were as follows:

<TABLE>
<CAPTION>
   Year ending March 31,
   ---------------------
   <S>                                                                 <C>
   2001............................................................... $547,000
   2002...............................................................   73,000
   2003...............................................................   74,000
   2004...............................................................   76,000
   2005...............................................................   38,000
                                                                       --------
     Total minimum lease payments..................................... $808,000
                                                                       ========
</TABLE>


                                     F-13
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

9. RETIREMENT PLAN

   Effective August 1, 1993, OPNET established a 401(k) retirement plan (the
"Plan") covering all eligible employees, as defined. Eligible employees who
are at least 21 years old may participate. Under the terms of the Plan,
participants may defer a portion of their salaries as employee contributions.
The Company makes matching contributions, and may make discretionary and extra
contributions. Employee contributions and extra contributions made by the
Company are 100% vested immediately. In general, matching and discretionary
contributions made by the Company vest ratably over a five-year period. The
Company's contributions under this Plan for fiscal years 1998, 1999 and 2000
were $92,000, $140,000 and $236,000, respectively.

10. NET INCOME PER COMMON SHARE

   In February 1997, the Financial Accounting Standards Board ("FASB") issued
SFAS No.128, Earnings Per Share. This statement requires dual presentation of
basic and diluted earnings per share on the face of the income statement.
Basic earnings per share is to be computed by dividing net income available to
common shareholders by the weighted average number of common shares
outstanding for the period. Diluted earnings per share is to reflect the
potential dilution that could occur if securities or other contracts to issue
common shares were exercised or converted into common shares for all periods
presented.

   During fiscal year 1999, the Board of Directors approved a 10-for-1 stock
split of all of the shares of the common stock of the Company authorized,
issued, and outstanding. All shares have been adjusted to reflect this change.

   The following is a reconciliation of the amounts used in calculating basic
and diluted net income per common share for fiscal years 1998, 1999 and 2000:

<TABLE>
<CAPTION>
                                                 1998       1999       2000
                                              ---------- ---------- ----------
   <S>                                        <C>        <C>        <C>
   Income (Numerator):
     Net income applicable to common shares
      (basic)................................ $1,766,000 $  193,000 $  561,000
     Plus:
     Accretion of transaction costs on
      redeemable convertible preferred
      stock..................................      9,000     14,000     14,000
                                              ---------- ---------- ----------
     Net income (diluted).................... $1,775,000 $  207,000 $  575,000
                                              ========== ========== ==========
   Shares (Denominator):
     Weighted average shares outstanding
      (basic)................................  7,435,090  7,107,337  7,175,191
     Effect of other dilutive securities:
       Options...............................    439,719    530,278    985,833
       Redeemable convertible preferred
        stock................................    723,200  1,446,400  1,447,846
                                              ---------- ---------- ----------
     Weighted average shares outstanding
      (diluted)..............................  8,598,009  9,084,015  9,608,870
                                              ========== ========== ==========
   Net income per common share:
     Basic net income applicable per common
      share.................................. $      .24 $      .03 $      .08
     Diluted net income per common share..... $      .21 $      .02 $      .06
</TABLE>

                                     F-14
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000


11. STOCK OPTION PLANS

   The 1993 Incentive Stock Option Plan (the "1993 Plan") provides for the
granting of incentive stock options to purchase up to 2,000,000 shares of
common stock of the Company. The option price must be equal to or greater than
the fair market value, as determined by the 1993 Plan Committee. Options are
granted for terms of up to 10 years, and generally vest over periods ranging
from one to six years from the date of grant.

   During fiscal year 1999, the Company also granted stock options under three
separate nonqualified stock option agreements. These options were granted for
a ten-year period and vest over three years.

   Option transactions were as follows:

<TABLE>
<CAPTION>
                                                              Weighted Average
                                                    Shares     Exercise Price
                                                   ---------  ----------------
   <S>                                             <C>        <C>
   Options outstanding, March 31, 1997............   347,500       $0.31
     Options granted..............................   546,685        1.30
     Options canceled.............................    (8,000)       0.50
                                                   ---------
   Options outstanding, March 31, 1998............   886,185        0.92
     Options granted..............................   416,650        2.80
     Options exercised............................   (13,000)       0.23
     Options canceled.............................   (82,095)       1.09
                                                   ---------
   Options outstanding, March 31, 1999............ 1,207,740        1.56
     Options granted..............................   173,506        3.86
     Options exercised............................  (180,117)       0.75
     Options canceled.............................   (22,005)       3.46
                                                   ---------
   Options outstanding, March 31, 2000............ 1,179,124        1.99
                                                   =========
   Options exercisable, March 31, 2000............    47,583        0.53
                                                   =========
   Options available for future grant, March 31,
    2000..........................................   872,876
                                                   =========
</TABLE>

   At March 31, 2000, options outstanding were as follows:

<TABLE>
<CAPTION>
                                                                           Weighted Average
                                       Number                                 Remaining
       Exercise Price                Outstanding                           Contractual Life
       --------------                -----------                           ----------------
       <S>                           <C>                                   <C>
           $0.121                        1,250                                4.00 years
            0.268                       15,000                                5.00
            0.404                      162,500                                6.00
            0.537                      251,760                                4.05
            2.200                      304,268                                5.17
            3.000                      398,846                                6.43
            6.000                       45,500                                9.73
</TABLE>

   The Company has computed the pro forma disclosures required under SFAS No.
123 for all stock options granted for the years ended March 31, 1998 and 1999,
using the minimum value method permitted by SFAS No. 123 for nonpublic
entities. For fiscal year 2000, the Company estimated its volatility based
upon the volatility of comparable public companies. The weighted average fair
value at date of grant for options granted during fiscal years 1998, 1999 and
2000 was $0.25, $0.44 and $4.52 per share, respectively.


                                     F-15
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

   The weighted average assumptions used for options granted during fiscal
years 1998, 1999 and 2000 were as follows:

<TABLE>
<CAPTION>
                                                    1998       1999      2000
                                                 ----------  --------  --------
   <S>                                           <C>         <C>       <C>
   Risk-free interest rate......................       6.00%     4.78%     5.90%
   Expected dividend yield......................       0.00%     0.00%     0.00%
   Expected life................................    4 years   4 years   4 years
   Volatility factor............................        --        --         82%

   The pro forma effects of applying SFAS No. 123 for fiscal years 1998, 1999
and 2000 would be as follows:

<CAPTION>
                                                    1998       1999      2000
                                                 ----------  --------  --------
   <S>                                           <C>         <C>       <C>
   Pro forma net income......................... $1,758,000  $174,000  $461,000
   Pro forma net income per share--basic........ $      .24  $    .02  $    .06
   Pro forma net income per share--diluted...... $      .21  $    .02  $    .05
</TABLE>

   At various dates during the year ended March 31, 2000, the Company granted
a total of 169,506 options to employees with exercise prices below the
estimated fair market value at the dates of grant. The Company recorded
compensation expense of $36,000 for the year ended March 31, 2000 resulting in
a remaining deferred compensation balance of $287,000 at March 31, 2000.

   On January 20, 2000, the Company accelerated the vesting of an executive
officer's options to purchase 100,000 shares of common stock. The vesting was
accelerated as a consideration to the officer because the related stock
options were initially intended to be incentive stock options, but were
actually non-qualified stock options under section 422 of the Internal Revenue
Code. Absent this acceleration, management believes that it is unlikely the
options would expire unexerciseable. The officer exercised the option in full
on that date and borrowed $231,024 from the Company to pay income taxes
incurred by him upon purchasing the shares under the option, as evidenced by a
promissory note. The Company has agreed to make additional loans to the
officer if it is subsequently determined that he owes additional taxes in
connection with the purchase of the shares. The current and any subsequent
borrowings under this agreement bear interest at an annual rate of 6% and are
due on the earlier of the second anniversary of the date of issuance of the
note or the first anniversary of this offering. In addition, the note gives
full recourse to the Company against all of the officer's assets. The Company
fully intends to exercise this recourse if necessary.

   On March 13, 2000, the Board of Directors approved, among other things,
resolutions:

   (a) To adopt, subject to stockholder approval, the 2000 Stock Incentive
Plan (the "2000 plan") pursuant to which the Company may grant incentive stock
options, non-qualified stock options, stock appreciation rights, performance
share awards, and restricted and unrestricted stock awards for the purchase of
1,200,000 shares of common stock. The 2000 plan provides that the option price
must be equal to or greater than the fair market value, as determined by the
Board of Directors. Options are granted for terms of up to 10 years.

   (b) To adopt, subject to stockholder approval, the 2000 Employee Stock
Purchase Plan, which provides all eligible employees of the Company, including
members of the Board of Directors who are employees, to purchase up to a
limited amount of shares, with a total limit of 300,000 shares of common stock
of the Company. An employee may authorize a payroll deduction up to a maximum
of 10% of his or her compensation during the plan period. The purchase price
for each share purchased will be 85% of the closing price of the common stock.

                                     F-16
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                YEARS ENDED MARCH 31, 1998, 1999 AND 2000

   (c) To adopt, subject to stockholder approval, the 2000 Director Stock
Option Plan, which provides for the automatic annual granting of options to
purchase stock to Directors of the Company, who are not employees of the
Company or any subsidiary of the Company, for up to a total of 100,000 shares
of common stock of the Company. The option price must be equal to or greater
than the fair market value, as determined by the Board of Directors.

   (d) To make no further grants of options or stock awards under the 1993
Incentive Stock Option Plan upon approval of the 2000 Stock Incentive Plan;
and

   (e) To issue 325,000 additional options, with an exercise price equal to
the initial public offering price per share, in the offering (See Note 14).

Compensation expense related to stock options for subsequent years is as
follows:

<TABLE>
<CAPTION>
   Year ending March 31,
   ---------------------
   <S>                                                                 <C>
     2001............................................................. $ 97,000
     2002.............................................................   94,000
     2003.............................................................   70,000
     2004.............................................................   26,000
                                                                       --------
       Total compensation expense..................................... $287,000
                                                                       ========
</TABLE>

12. BUSINESS SEGMENT AND GEOGRAPHIC AREA INFORMATION

   The Company operates in one industry segment, the development and sale of
computer software programs and related services. No single customer accounted
for 10% or more of the Company's accounts receivable or revenues as of or for
the fiscal years ended March 31, 1998, 1999 or 2000. In addition, there were
no sales to any customers within a single country except for the United States
where such sales accounted for 10% or more of total revenue. Substantially all
assets are held in the United States for the fiscal years ended March 31,
1998, 1999 or 2000.

   Revenues by geographic destination and as a percentage of total revenues
for fiscal years 1998, 1999 and 2000 are as follows:

<TABLE>
<CAPTION>
                                             1998         1999         2000
                                          -----------  -----------  -----------
   <S>                                    <C>          <C>          <C>
   Geographic Area by Destination
   United States......................... $ 7,624,000  $ 8,279,000  $14,424,000
   International.........................   4,305,000    3,724,000    4,811,000
                                          -----------  -----------  -----------
                                          $11,929,000  $12,003,000  $19,235,000
                                          ===========  ===========  ===========
<CAPTION>
                                             1998         1999         2000
                                          -----------  -----------  -----------
   <S>                                    <C>          <C>          <C>
   Geographic Area by Destination
   United States.........................        63.9%        69.0%        75.0%
   International.........................        36.1         31.0         25.0
                                          -----------  -----------  -----------
                                                100.0%       100.0%       100.0%
                                          ===========  ===========  ===========
</TABLE>

                                     F-17
<PAGE>

                           OPNET TECHNOLOGIES, INC.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)
                   YEARS ENDED MARCH 31, 1998, 1999 AND 2000


13. VALUATION AND QUALIFYING ACCOUNTS

   The following table sets forth activity in the Company's accounts
receivable reserve accounts:

<TABLE>
<CAPTION>
                                     Balance at                       Balance at
                                     Beginning  Charges to              End of
                                     of Period   Expenses  Deductions   Period
                                     ---------- ---------- ---------- ----------
<S>                                  <C>        <C>        <C>        <C>
Year ended -
  March 31, 1998....................  $    --    $    --    $    --    $    --
  March 31, 1999....................       --     185,000        --     185,000
  March 31, 2000....................   185,000     53,000    138,000    100,000
</TABLE>

   Deductions represent write-offs of receivables previously reserved.

14. INITIAL PUBLIC OFFERING

   On March 13, 2000, the Board of Directors approved the Company's plan to
make a public offering of up to $70,000,000 of common stock.

   To be effective upon closing of the offering, the Board of Directors
approved a resolution to increase the authorized capital stock of the Company
to 105,160,000 shares, consisting of 100,000,000 shares of common stock, par
value $.001 per share, 160,000 shares of Series A redeemable convertible
preferred stock, and 5,000,000 shares of undesignated preferred stock, par
value $.001 per share.


                                     F-18
<PAGE>

[Inside Back Cover]

OPNET Customers

A photograph of an individual looking at a screen shot in the center of the
page.  Along the left side of the page appear the names of certain customers of
OPNET:

Enterprises
Abbott Laboratories
Aerospatiale Matra
Andersen Consulting
Baker Hughes
Boeing
Booz Allen & Hamilton
DaimlerChrysler
Daimler-Benz
DIRECTV
Entergy
IBM
Internal Revenue Service
NASA
National Semiconductor
NetEffect
Oracle
RR Donnelley
SAP
Spiegel
Texas Utilities

Service Providers
AT&T
AT&T Wireless
Belgacom
Bell Atlantic
Bell Canada
British Telecom
Deutsche Telekom
France Telecom
Inmarsat
INTELSAT
Korea Telecom
MCI WorldCom
SBC Communications
Sprint
Teledesic
Telia
<PAGE>

Telstra
US West
UUNET Technologies
Vodafone AirTouch


Along the right side of the page appear the names of certain customers of OPNET:

Network Equipment Manufacturers
3Com
Advanced Micro Devices
Alcatel
Ascom
CableLabs
Cisco Systems
E-Systems
Ericsson
FORE Systems
Fujitsu
GEC Marconi Avionics
General Instruments
GTE
Hewlett-Packard
Hughes Electronics
Intel
ITT Industries
Lockheed Martin
Lucent Technologies
Matsushita Electric Industrial
Motorola
NEC
Network Equipment Technologies
Newbridge Networks
Nokia
Nortel Networks
Philips Electronics
QUALCOMM
Raytheon
Rockwell
Scientific Atlanta
Siemens
ST Microelectronics
Toshiba
TRW
<PAGE>

The customers identified here are generally representative of our customer base
and have licensed at least $50,000 of our software.  No single customer
accounted for more than 10% of our total revenues in any of the last three
fiscal years.

The OPNET logo appears in the bottom center of the page.
<PAGE>

[Outside Back Cover]

OPNET Logo
Optimum Network Performance

Software That Understands Networks
<PAGE>

                                    PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

Item 13. Other Expenses of Issuance and Distribution.

   The following table sets forth the costs and expenses, other than the
underwriting discounts and commissions, payable by the Registrant in
connection with the sale of common stock being registered. All amounts are
estimates except the SEC registration fee, the NASD filing fee and the Nasdaq
National Market listing fee.

<TABLE>
   <S>                                                                  <C>
   SEC registration fee................................................ $15,180
   NASD filing fee.....................................................   6,250
   Nasdaq National Market listing fee..................................    *
   Printing and engraving expenses.....................................    *
   Legal fees and expenses.............................................    *
   Accounting fees and expenses........................................    *
   Blue Sky fees and expenses (including legal fees)...................  25,000
   Transfer agent and registrar fees and expenses......................    *
   Miscellaneous.......................................................    *
                                                                        -------
     Total............................................................. $ *
                                                                        =======
</TABLE>
- --------
*  To be filed by amendment.

   The Registrant will bear all expenses shown above.

Item 14. Indemnification of Directors and Officers.

   The Registrant's Third Amended and Restated Certificate of Incorporation
(the "Restated Certificate") provides that, except to the extent prohibited by
the Delaware General Corporation Law (the "DGCL"), the Registrant's directors
shall not be personally liable to the Registrant or its stockholders for
monetary damages for any breach of fiduciary duty as directors of the
Registrant. Under the DGCL, the directors have a fiduciary duty to the
Registrant which is not eliminated by this provision of the Restated
Certificate and, in appropriate circumstances, equitable remedies such as
injunctive or other forms of nonmonetary relief will remain available. In
addition, each director will continue to be subject to liability under the
DGCL for breach of the director's duty of loyalty to the Registrant, for acts
or omissions which are found by a court of competent jurisdiction to be not in
good faith or involving intentional misconduct, for knowing violations of law,
for actions leading to improper personal benefit to the director, and for
payment of dividends or approval of stock repurchases or redemptions that are
prohibited by the DGCL. This provision also does not affect the directors'
responsibilities under any other laws, such as the federal securities laws or
state or federal environmental laws. The Registrant has obtained liability
insurance for its officers and directors.

   Section 145 of the DGCL empowers a corporation to indemnify its directors
and officers and to purchase insurance with respect to liability arising out
of their capacity or status as directors and officers, provided that this
provision shall not eliminate or limit the liability of a director: (i) for
any breach of the director's duty of loyalty to the corporation or its
stockholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii) arising under
Section 174 of the DGCL including for an unlawful payment of dividend or
unlawful stock purchase or redemption or (iv) for any transaction from which
the director derived an improper personal benefit. The DGCL provides further
that the indemnification permitted thereunder shall not be deemed exclusive of
any other rights to which the directors and officers may be entitled under the
corporation's by-laws, any agreement, a vote of stockholders or otherwise. The
Restated Certificate eliminates the personal liability of directors to the
fullest extent permitted by the DGCL and, together with the Registrant's
Amended and Restated By-Laws (the "Restated By-Laws"), provides that the
Registrant

                                     II-1
<PAGE>

shall fully indemnify any person who was or is a party or is threatened to be
made a party to any threatened, pending or completed action, suit or
proceeding (whether civil, criminal, administrative or investigative) by
reason of the fact that such person is or was a director or officer of the
Registrant, or is or was serving at the request of the Registrant as a
director or officer of another corporation, partnership, joint venture, trust,
employee benefit plan or other enterprise, against expenses (including
attorney's fees), judgments, fines and amounts paid in settlement actually and
reasonably incurred by such person in connection with such action, suit or
proceeding. Reference is made to the Registrant's Form of Third Amended and
Restated Certificate of Incorporation and Form of Amended and Restated By-Laws
filed as Exhibits 3.2 and 3.4 hereto, respectively.

   The Underwriting Agreement provides that the Underwriters are obligated,
under certain circumstances, to indemnify directors, officers and controlling
persons of the Company against certain liabilities, including liabilities
under the Securities Act of 1933, as amended (the "Securities Act"). Reference
is made to the form of Underwriting Agreement to be filed as Exhibit 1.1
hereto.

   At present, there is no pending litigation or proceeding involving any
director, officer, employee or agent as to which indemnification will be
required or permitted under the Restated Certificate. The Registrant is not
aware of any threatened litigation or proceeding that may result in a claim
for such indemnification.

Item 15. Recent Sales of Unregistered Securities.

   The following information regarding the issuance of the Registrant's
securities does not give effect to an anticipated stock split of the
Registrant's common stock or the conversion of the Registrant's series A
convertible preferred stock into common stock upon the completion of this
offering. Pursuant to the Registrant's stock split, each share of common stock
will be split into a to-be-determined number of shares. Upon the completion of
this offering, each share of series A convertible preferred stock will
automatically convert into a to be determined number of shares of common
stock. Since March 1, 1997, the Registrant has issued the following securities
that were not registered under the Securities Act as summarized below.

   (a) On September 30, 1997, the Registrant issued and sold an aggregate of
144,640 shares of its series A convertible preferred stock to two accredited
investors for an aggregate sale price of $7,000,576. The Registrant relied on
the exemption provided by Section 4(2) under the Securities Act for this sale
of its series A convertible preferred stock.

   (b) On November 1, 1998, the Registrant issued and sold 10,000 shares of
its common stock to each of Dr. Finn and Mr. Stasior for a purchase price of
$30,000. Dr. Finn and Mr. Stasior are members of the Registrant's board of
directors. The Registrant relied on the exemption provided by Section 4(2)
under the Securities Act for this sale of its common stock.

   (c) Since April 1, 1994, the Registrant has issued options to purchase a
total of 1,542,091 shares of common stock at exercise prices ranging from
$0.121 to $6.000 per share to employees, consultants and directors pursuant to
the Registrant's Amended and Restated 1993 Incentive Stock Option Plan, of
which options to purchase 1,136,841 shares of common stock were issued after
March 1, 1997. As of March 31, 2000, optionees have exercised options to
purchase an aggregate of 193,117 shares of common stock at a weighted average
exercise price of $.63 per share and options to purchase 1,179,124 shares of
common stock are outstanding. The Registrant relied on an exemption provided
by Rule 701 under the Securities Act for the issuance of these options.

   The purchasers in each of the above-mentioned transactions represented
their intention to acquire the securities for investment only and not with a
view to the distribution thereof. Appropriate legends were affixed to the
stock certificates issued in such transactions. All recipients had access,
through employment or other relationships, to information about the Registrant
to make an informed investment decision. No underwriters were involved in the
foregoing sales of securities.

                                     II-2
<PAGE>

Item 16. Exhibits and Financial Statement Schedules.

   (a) Exhibits:

<TABLE>
<CAPTION>
 Exhibit
   No.                                 Description
 -------                               -----------
 <C>     <S>
  1.1**  Form of Underwriting Agreement
  3.1**  Form of Second Amended and Restated Certificate of Incorporation
  3.2**  Form of Third Amended and Restated Certificate of Incorporation of the
         Registrant, to be filed at the completion of this offering
  3.3*   By-Laws of the Registrant
  3.4**  Form of Amended and Restated By-Laws of the Registrant, to be
         effective upon the completion of this offering
  4.1**  Specimen common stock certificate
  4.2*   See Exhibits 3.1, 3.2, 3.3 and 3.4 for provisions of the Certificate
         of Incorporation and By-Laws of the Registrant defining the rights of
         holders of common stock of the Registrant
  5.1**  Opinion of Hale and Dorr LLP
 10.1*   Series A Preferred Stock Purchase Agreement, dated as of September 30,
         1997, by and among the Registrant, Summit Ventures IV, L.P. and Summit
         Investors III, L.P.
 10.2*   Shareholders Agreement, dated as of September 30, 1997, by and among
         the Registrant, Summit Ventures IV, L.P., Summit Investors III, L.P.,
         Marc A. Cohen and Alain J. Cohen
 10.3*   Registration Rights Agreement, dated as of September 30, 1997, by and
         among the Registrant, Summit Ventures IV, L.P., Summit Investors III,
         L.P., Marc A. Cohen and Alain J. Cohen
 10.4*   Stock Repurchase Agreement, dated as of September 30, 1997, by and
         between the Registrant and Marc A. Cohen
 10.5*   Stock Repurchase Agreement, dated as of September 30, 1997, by and
         between the Registrant and Alain J. Cohen
 10.6*   Stock Purchase and Option Agreement, dated as of November 1, 1998,
         between the Registrant and Steven G. Finn
 10.7*   Stock Purchase and Option Agreement, dated as of November 1, 1998,
         between the Registrant and William F. Stasior
 10.8*   Stock Repurchase Agreement, dated as of September 30, 1997, by and
         between the Registrant and George M. Cathey
 10.9*   Stock Purchase and Option Agreement, dated as of December 4, 1995,
         between the Registrant and George M. Cathey, as amended on January 20,
         2000
 10.10** Amended and Restated 1993 Incentive Stock Option Plan
 10.11** 2000 Stock Incentive Plan
 10.12** 2000 Employee Stock Purchase Plan
 10.13** 2000 Director Stock Option Plan
 10.14*  Employment Agreement, dated as of December 4, 1995, between the
         Registrant and George M. Cathey
 10.15*  Non-competition Agreement, dated as of September 30, 1997, between the
         Registrant and Marc A. Cohen
 10.16*  Non-competition Agreement, dated as of September 30, 1997, between the
         Registrant and Alain J. Cohen
 10.17*  Loan Agreement, dated as of January 20, 2000, between the Registrant
         and George M. Cathey
 10.18*  Secured Promissory Note, dated as of January 20, 2000, issued by
         George M. Cathey to the Registrant
 10.19** Form of Change-of-Control Agreement between the Registrant and Joseph
         F. Greeves
 10.20** Form of Change-of-Control Agreement between the Registrant and Pradeep
         K. Singh
 10.21*  Agreement of Lease, dated as of June 18, 1993, between the Registrant
         and International Telecommunication Satellite Organization, as amended
         on October 26, 1994, as amended on April 28, 1995, as amended on
         September 8, 1995, as amended on April 28, 1999, as amended on
         September 7, 1999
 10.22*  Sublease Agreement, dated as of November 1, 1997, between the
         Registrant and WJLA-TV
 10.23** Form of Change-of-Control Agreement between the Registrant and George
         M. Cathey
 21.1**  Subsidiaries of the Registrant
 23.1    Consent of Deloitte & Touche LLP
 23.2**  Consent of Hale and Dorr LLP (included in Exhibit 5.1)
 24.1    Powers of Attorney (see page II-5)
 27.1    Financial Data Schedule
</TABLE>

- --------

*  Previously filed.

** To be filed by amendment.

                                      II-3
<PAGE>

   (b) Financial Statement Schedules:

   All schedules for which provision is made in the applicable accounting
regulation of the Securities and Exchange Commission are not required under
the related instructions or are inapplicable, and therefore have been omitted.

Item 17. Undertakings.

   The undersigned registrant hereby undertakes to provide to the Underwriters
at the closing specified in the Underwriting Agreement, certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.

   Insofar as indemnification for liabilities arising under the Securities Act
of 1933, as amended (the "Act"), may be permitted to directors, officers and
controlling persons of the registrant pursuant to the Delaware General
Corporation Law, the Restated Certificate of the registrant, the Underwriting
Agreement, or otherwise, the registrant has been advised that in the opinion
of the Securities and Exchange Commission such indemnification is against
public policy as expressed in the Act, and is, therefore, unenforceable. In
the event that a claim for indemnification against such liabilities (other
than the payment by the registrant of expenses incurred or paid by a director,
officer or controlling person of the registrant in the successful defense of
any action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered
hereunder, the registrant will, unless in the opinion of counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication
of such issue.

   The undersigned registrant hereby undertakes that:

     (1) For purpose of determining any liability under the Act, the
  information omitted from the form of prospectus filed as part of this
  Registration Statement in reliance upon Rule 430A and contained in a form
  of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4), or
  497(h) under the Act shall be deemed to be part of this Registration
  Statement as of the time it was declared effective.

     (2) For purpose of determining any liability under the Act, each post-
  effective amendment that contains a form of prospectus shall be deemed to
  be a new Registration Statement relating to the securities offered therein,
  and the offering of such securities at that time shall be deemed to be the
  initial bona fide offering thereof.



                                     II-4
<PAGE>

                                  SIGNATURES

   Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment No. 1 to the Registration Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, in
Washington, D.C., on this 11th day of May, 2000.

                                          OPNET TECHNOLOGIES, INC.

                                            By:

                                                /s/ Alain J. Cohen
                                                -----------------------

                                                    Alain J. Cohen

                                             President, Chief Technology

                                                 Officer and Director

<TABLE>
<CAPTION>
               Signature                          Title                Date
               ---------                          -----                ----
 <C>                                    <S>                        <C>
                   *                    Chairman of the Board of   May 11, 2000
 ______________________________________  Directors and Chief
             Marc A. Cohen               Executive Officer
                                         (Principal Executive
                                         Officer)

           /s/ Alain J. Cohen           President, Chief           May 11, 2000
 ______________________________________  Technology Officer and
             Alain J. Cohen              Director

         /s/ Joseph F. Greeves          Senior Vice President of   May 11, 2000
 ______________________________________  Finance and Chief
           Joseph F. Greeves             Financial Officer
                                         (Principal Financial
                                         and Accounting Officer)

                   *                    Director                   May 11, 2000
 ______________________________________
             Bruce R. Evans

                   *                    Director                   May 11, 2000
 ______________________________________
             Steven G. Finn

                   *                    Director                   May 11, 2000
 ______________________________________
           William F. Stasior
</TABLE>

By: /s/ Alain J. Cohen
_________________________________

      Alain J. Cohen

      Attorney-in-Fact

                                     II-5
<PAGE>


                               EXHIBIT INDEX

<TABLE>
<CAPTION>
 Exhibit
   No.                                 Description
 -------                               -----------
 <C>     <S>
  1.1**  Form of Underwriting Agreement
  3.1**  Form of Second Amended and Restated Certificate of Incorporation
  3.2**  Form of Third Amended and Restated Certificate of Incorporation of the
         Registrant, to be filed at the completion of this offering
  3.3*   By-Laws of the Registrant
  3.4**  Form of Amended and Restated By-Laws of the Registrant, to be
         effective upon the completion of this offering
  4.1**  Specimen common stock certificate
  4.2*   See Exhibits 3.1, 3.2, 3.3 and 3.4 for provisions of the Certificate
         of Incorporation and By-Laws of the Registrant defining the rights of
         holders of common stock of the Registrant
  5.1**  Opinion of Hale and Dorr LLP
 10.1*   Series A Preferred Stock Purchase Agreement, dated as of September 30,
         1997, by and among the Registrant, Summit Ventures IV, L.P. and Summit
         Investors III, L.P.
 10.2*   Shareholders Agreement, dated as of September 30, 1997, by and among
         the Registrant, Summit Ventures IV, L.P., Summit Investors III, L.P.,
         Marc A. Cohen and Alain J. Cohen
 10.3*   Registration Rights Agreement, dated as of September 30, 1997, by and
         among the Registrant, Summit Ventures IV, L.P., Summit Investors III,
         L.P., Marc A. Cohen and Alain J. Cohen
 10.4*   Stock Repurchase Agreement, dated as of September 30, 1997, by and
         between the Registrant and Marc A. Cohen
 10.5*   Stock Repurchase Agreement, dated as of September 30, 1997, by and
         between the Registrant and Alain J. Cohen
 10.6*   Stock Purchase and Option Agreement, dated as of November 1, 1998,
         between the Registrant and Steven G. Finn
 10.7*   Stock Purchase and Option Agreement, dated as of November 1, 1998,
         between the Registrant and William F. Stasior
 10.8*   Stock Repurchase Agreement, dated as of September 30, 1997, by and
         between the Registrant and George M. Cathey
 10.9*   Stock Purchase and Option Agreement, dated as of December 4, 1995,
         between the Registrant and George M. Cathey, as amended on January 20,
         2000
 10.10** Amended and Restated 1993 Incentive Stock Option Plan
 10.11** 2000 Stock Incentive Plan
 10.12** 2000 Employee Stock Purchase Plan
 10.13** 2000 Director Stock Option Plan
 10.14*  Employment Agreement, dated as of December 4, 1995, between the
         Registrant and George M. Cathey
 10.15*  Non-competition Agreement, dated as of September 30, 1997, between the
         Registrant and Marc A. Cohen
 10.16*  Non-competition Agreement, dated as of September 30, 1997, between the
         Registrant and Alain J. Cohen
 10.17*  Loan Agreement, dated as of January 20, 2000, between the Registrant
         and George M. Cathey
 10.18*  Secured Promissory Note, dated as of January 20, 2000, issued by
         George M. Cathey to the Registrant
 10.19** Form of Change-of-Control Agreement between the Registrant and Joseph
         F. Greeves
 10.20** Form of Change-of-Control Agreement between the Registrant and Pradeep
         K. Singh
 10.21*  Agreement of Lease, dated as of June 18, 1993, between the Registrant
         and International Telecommunication Satellite Organization, as amended
         on October 26, 1994, as amended on April 28, 1995, as amended on
         September 8, 1995, as amended on April 28, 1999, as amended on
         September 7, 1999
 10.22*  Sublease Agreement, dated as of November 1, 1997, between the
         Registrant and WJLA-TV
 10.23** Form of Change-of-Control Agreement between the Registrant and George
         M. Cathey
 21.1**  Subsidiaries of the Registrant
 23.1    Consent of Deloitte & Touche LLP
 23.2**  Consent of Hale and Dorr LLP (included in Exhibit 5.1)
 24.1    Powers of Attorney (see page II-5)
 27.1    Financial Data Schedule
</TABLE>

- --------

*  Previously filed.

** To be filed by amendment.

<PAGE>

                                                                    Exhibit 23.1

                         INDEPENDENT AUDITORS' CONSENT

We consent to the use in this Amendment No. 1 to Registration Statement No. 333-
32588 of OPNET Technologies, Inc. of our report dated April 19, 2000, appearing
in the Prospectus, which is part of such registration statement and the
reference to us under the heading "Experts" in such Prospectus.

DELOITTE & TOUCHE LLP

McLean, Virginia
May 10, 2000

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE AUDITED
FINANCIAL STATEMENTS FOR THE YEAR ENDED MARCH 31, 2000 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-2000
<PERIOD-START>                             APR-01-1999
<PERIOD-END>                               MAR-31-2000
<CASH>                                           8,765
<SECURITIES>                                         0
<RECEIVABLES>                                    3,219
<ALLOWANCES>                                      (100)
<INVENTORY>                                          0
<CURRENT-ASSETS>                                13,237
<PP&E>                                           3,662
<DEPRECIATION>                                  (1,390)
<TOTAL-ASSETS>                                  16,713
<CURRENT-LIABILITIES>                            6,125
<BONDS>                                              0
                            6,948
                                          0
<COMMON>                                            11
<OTHER-SE>                                       3,457
<TOTAL-LIABILITY-AND-EQUITY>                    16,713
<SALES>                                         19,235
<TOTAL-REVENUES>                                19,235
<CGS>                                            3,603
<TOTAL-COSTS>                                    3,603
<OTHER-EXPENSES>                                15,299
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                (414)
<INCOME-PRETAX>                                    747
<INCOME-TAX>                                       172
<INCOME-CONTINUING>                                575
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       575
<EPS-BASIC>                                        .08
<EPS-DILUTED>                                      .06




</TABLE>


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