ONI SYSTEMS CORP
424B1, 2000-06-01
TELEPHONE & TELEGRAPH APPARATUS
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<PAGE>

                                                Filed Pursuant to Rule 424(B)(1)
                                                      Registration No. 333-32104
[LOGO OF ONI SYSTEMS]

                                8,000,000 Shares

                               ONI Systems Corp.

                                  Common Stock

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

   This is an initial public offering of shares of common stock of ONI Systems
Corp.

   Prior to this offering, there has been no public market for our common
stock. Our common stock has been approved for quotation on the Nasdaq National
Market under the symbol "ONIS".

   See "Risk Factors" beginning on page 7 to read about factors you should
consider before buying shares of our common stock.

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

   Neither the Securities and Exchange Commission nor any other regulatory body
has approved or disapproved of these securities or passed upon the accuracy or
adequacy of this prospectus. Any representation to the contrary is a criminal
offense.

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

<TABLE>
<CAPTION>
                                                             Per
                                                            Share     Total
                                                            ------ ------------
<S>                                                         <C>    <C>
Initial public offering price.............................. $25.00 $200,000,000
Underwriting discount...................................... $ 1.75 $ 14,000,000
Proceeds, before expenses, to ONI Systems.................. $23.25 $186,000,000
</TABLE>

   To the extent that the underwriters sell more than 8,000,000 shares, the
underwriters have the option to purchase up to an additional 1,200,000 shares
from ONI Systems at the initial public offering price, less the underwriting
discount.

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

   The underwriters expect to deliver the shares in New York, New York on June
6, 2000.

Goldman, Sachs & Co.
                 Banc of America Securities LLC
                                   Chase H&Q
                                                             Robertson Stephens

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

                         Prospectus dated May 31, 2000.
<PAGE>

                         [INSIDE FRONT COVER ARTWORK]

   At the top of the diagram the ONI Systems logo and the words "All-optical
networking equipment for metropolitan and regional service providers" appear.

   Upper Half--An oval placed in the center of the diagram with figures inside
the oval.

   Interior of the Oval--The oval is divided into three portions:

   The right-hand portion of the oval is a schematic symbol used to represent
an optical cross- connect linking the metro network to the long haul network.
The words "To Long-haul Networks" appear below the schematic.

   The center portion of the oval contains a multi-color ellipse or "ring"
with four ONLINE9000 boxes or "nodes" at approximately 12 o'clock, 3 o'clock,
6 o'clock and 9 o'clock on the ring The left-most node of the ring is shared
as the right-most node of the ring contained in the left portion of the oval.
The ring represents a ring-based fiber optic network. The words "Metro Core
Optical Fiber Ring" appear inside the ring. The ring is connected by two lines
(representing fiber links) to the optical cross-connect schematic in the
right-hand portion of the oval.

   The left portion of the oval contains a multi-color ellipse or "ring" with
three ONLINE7000 boxes or "nodes" at approximately 12 o'clock, 6 o'clock and 9
o'clock on the ring, and a ONLINE7000 node at approximately 3 o'clock. The
right-most node of the ring is shared as the left-most node of the ring
contained in the center portion of the oval. The upper-most node of the ring
is connected to a diagram of a building representing the enterprises connected
to the communications network. The building is connected to a diagram of two
computer screens and one telephone representing the end users. The words
"Metro Access Optical Fiber Ring" appear inside the ring. The words "Typical
Metro Communications Network Using ONI Systems Equipment" appear below the
oval.

   Lower Right Quadrant--A globe showing the North American continent and
portions of South America, Africa, Europe and Asia with a network of white
lines superimposed. The ovals in the upper half and lower half of the diagram
are each connected to one of the dots in the map-network (approximately in the
vicinity of San Francisco and New York, respectively) with trace lines
indicating that the ovals represent a representative node on the network.

   Lower Half--A second smaller oval offset to the left of the diagram with
figures inside the oval.

   Interior of the Oval--The oval is divided into the same three portions as
the oval contained in the upper half of the diagram, except that the three
portions of the oval are in reverse order of the three portions in the oval in
the upper half of the diagram and there are no interior labels.

   At the bottom of the page is a legend showing the symbols that represent
the ONLINE9000, ONLINE7000, Enterprises, End Users, Long-haul Networks and
Optical Fiber Link.
<PAGE>


                               PROSPECTUS SUMMARY

   You should read this summary together with the entire prospectus, including
the more detailed information in our financial statements and accompanying
notes appearing elsewhere in this prospectus.

                               ONI Systems Corp.

   We develop, market and sell communications networking equipment, based
entirely on optical technology, for metropolitan area and regional networks.
Our equipment uses pulses of light rather than electric current in the
transmission and routing of telephone, Internet and other data communications
in these networks. Our customers are communication service providers. Our
products enable them to relieve traffic bottlenecks in their metropolitan and
regional networks and to deliver new data communication services sought by
their subscribers. Our products help our customers to rapidly build high-
capacity metro networks that are flexible, easy to expand and capable of
supporting multiple services for end-users.

   Internet usage has increased in terms of both the number of users and the
quantity of information transmitted. In response, communication service
providers have deployed optical technology to increase the transmission
capacity in long-distance networks and in the local area networks used by
enterprises. However, similar improvements have not been made to the metro
networks that bridge the gap between enterprise networks and long-distance
networks. To date, optical products available to metro network service
providers have been based on technologies which were originally designed to
serve long distance or enterprise networks, and are costly, difficult to expand
and difficult to manage in the metro environment.

   Our first product, the ONLINE9000(TM), has been generally available since
January 2000. We expect our next product, the ONLINE7000(TM), to be available
by June 2000. These products incorporate our OPTX(TM) network operating system
and our OLMP(TM) inter-network communications protocol to manage and support a
diverse mix of service offerings by our customers.

   The benefits of our products include:

  . Multi-service capability. Our products allow service providers to
    introduce and support a changing mix of services without deploying
    dedicated equipment for each service type. Our products are also
    compatible with existing services based on the synchronous optical
    network standard.

  . Manageability and flexibility. Our products enable real time end-to-end
    management, surveillance, service activation, network inventory
    management and billing within our OPTX network operating system.

  . Cost effectiveness and scalability. Our products eliminate costly
    optical-to-electrical conversions within a metro network, and the
    scalability of our products allows service providers to build metro
    networks in a pay-as-you-grow fashion.

  . Rapid and efficient service restoration. Our products provide for rapid
    restoration of mission critical services without the need to dedicate
    network capacity carrying duplicated traffic for this capability.

                                       3
<PAGE>


  The following are key elements of our strategy:

  . leverage our optical technology to achieve early design wins in metro
    networks;

  . work closely with service providers to identify and enable new revenue-
    generating services for their end-users;

  . extend our technology leadership through continued investment in research
    and development;

  . leverage our optical manufacturing expertise and relationships to reduce
    costs and increase flexibility to meet demand;

  . expand our direct sales and service and support capabilities worldwide;
    and

  . establish strategic alliances and pursue acquisitions to broaden our
    product, service and technology portfolios.

   Since commencing operations in December 1997, our expenses have
significantly exceeded our revenue as we have developed our products and
strategy. Through March 31, 2000, we incurred cumulative losses of $89.8
million. We expect to have large fixed expenses and to incur increasing sales,
research, manufacturing and administrative expenses, and we expect to operate
at a loss for a period of time. We expect to continue to need to raise capital
to fund losses and expansion. Our first product has been generally available
only since January 2000, so the likelihood of success of this and future
products is impossible to predict.

                             Corporate Information

   We were incorporated in California on October 20, 1997 as Optical Networks,
Incorporated. In April 2000, we reincorporated in Delaware and changed our name
to ONI Systems Corp. Our principal executive offices are located at 166
Baypointe Parkway, San Jose, California 95134-1621. Our telephone number is
(408) 965-2600.

                                       4
<PAGE>

                                  THE OFFERING

<TABLE>
<S>                               <C>
Common stock offered............. 8,000,000 shares
Common stock to be outstanding
 after this offering............. 123,668,472 shares
Use of proceeds.................. For general corporate purposes, including
                                  working capital, capital expenditures and
                                  potential acquisitions of, or investments in,
                                  complementary technologies or businesses. See
                                  "Use of Proceeds".
Nasdaq National Market symbol.... ONIS
</TABLE>

   At the request of ONI Systems, the underwriters are reserving up to 960,000
shares of common stock at the initial public offering price for sale to
individuals and entities designated by ONI Systems.

   The number of shares of our common stock to be outstanding immediately after
this offering is based on the number of shares outstanding as of March 31, 2000
assuming the one-to-one conversion of preferred stock outstanding as of March
31, 2000 upon completion of this offering. The number of shares outstanding
after this offering includes:

  . 969,697 shares of common stock into which the shares of Series H
    preferred stock sold to Sun Microsystems, Inc. will automatically convert
    upon completion of this offering;

  . 160,000 shares of common stock issuable to Internet Initiative Japan Inc.
    upon the closing of a private placement, concurrent with this offering;
    and

  . 400,000 shares of common stock issuable to CCT Telecom Holdings Limited
    upon the closing of a private placement, concurrent with this offering.

  The number of shares to be outstanding excludes, as of March 31, 2000:

  . 19,343,345 shares of common stock subject to options outstanding under
    our stock incentive plans with a weighted average exercise price of $0.64
    per share, and 1,377,819 shares of common stock available for future
    grant under these plans; and

  . 1,434,394 shares of common stock subject to outstanding warrants with a
    weighted average exercise price of $2.72 per share.

   In addition, from April 1, 2000 through May 15, 2000, we granted options to
purchase 2,680,000 shares of common stock, with a weighted average exercise
price of $8.02 per share. Of these shares, 1,000,000 shares will be subject to
an option that is outside of the stock plans described in this prospectus. In
connection with options granted from April 1, 2000 through May 15, 2000, we
have recorded a deferred stock compensation expense of approximately $16.2
million. In April 2000, we adopted our 2000 equity incentive plan, under which
7,000,000 shares of common stock will be available for future grant, and our
2000 employee stock purchase plan, under which 1,000,000 shares of common stock
will be available for future grant.

   Unless otherwise indicated, all information contained in this prospectus
assumes no exercise of the underwriters' option to purchase additional shares
in this offering and gives effect to the automatic conversion of outstanding
shares of preferred stock into shares of common stock upon the closing of this
offering. The share and per share numbers presented in this prospectus have
been retroactively restated to give effect to all stock splits.

                                       5
<PAGE>

                      SUMMARY CONSOLIDATED FINANCIAL DATA
                     (in thousands, except per share data)

<TABLE>
<CAPTION>
                            Period From
                          October 20, 1997    Year Ended        Three Months
                           (Inception) to    December 31,     Ended March 31,
                            December 31,   -----------------  -----------------
                                1997        1998      1999     1999      2000
                          ---------------- -------  --------  -------  --------
                                                                (unaudited)
<S>                       <C>              <C>      <C>       <C>      <C>
Statement of operations
 data:
Revenue.................       $   --      $ 1,733  $  3,034  $   565  $  3,633
Gross profit............           --          525     2,002      140       783
Operating expenses......          198        9,559    49,195    5,082    35,752
Operating loss..........         (198)      (9,034)  (47,193)  (4,942)  (34,969)
Net loss................         (199)      (8,852)  (46,572)  (4,777)  (34,167)
Basic and diluted net
 loss per share.........       $(0.77)     $ (0.74) $  (2.58) $ (0.35) $  (1.41)
Weighted average shares
 outstanding used in
 computing basic and
 diluted net loss per
 share..................          257       11,919    18,043   13,542    24,219
Pro forma basic and
 diluted net loss per
 share..................                              $(0.60)            $(0.33)
Shares used in computing
 pro forma basic and
 diluted loss per share.                              78,025            103,154
</TABLE>

   Pro forma basic and diluted net loss per share has been calculated assuming
the conversion of all preferred stock outstanding at March 31, 2000 into common
stock, as if all shares had converted at the beginning of the year or, if
later, on the date of their issuance.
<TABLE>
<CAPTION>
                                                  As of March 31, 2000
                                          -------------------------------------
                                                    Pro   Pro Forma  Pro Forma
                                          Actual   Forma  Series H  As Adjusted
                                          ------- ------- --------- -----------
<S>                                       <C>     <C>     <C>       <C>
Balance sheet data:
Cash and cash equivalents................ $50,307 $50,307 $ 70,307   $268,782
Working capital..........................  59,101  59,101   79,101    277,576
Total assets.............................  95,869  95,869  115,869    314,344
Capital lease obligations, less current
 portion.................................     295     295      295        295
Total stockholders' equity...............  78,699  78,699   98,699    297,174
</TABLE>

   The pro forma Series H balance sheet data as of March 31, 2000 gives effect
to the May 2000 sale of 1,333,333 shares of Series H preferred stock to Sun
Microsystems in a private placement at a price of $15.00 per share. These
shares will automatically convert into 969,697 shares of common stock upon the
completion of this offering.

   The pro forma as adjusted balance sheet data as of March 31, 2000 gives
effect to:

  . the sale of 8,000,000 shares of common stock in this offering at the
    initial public offering price of $25.00 per share, after deducting the
    underwriting discount and estimated offering expenses;

  . the sale of 160,000 shares of common stock to Internet Initiative Japan
    in a private placement concurrent with this offering at a private
    placement price of $25.00 per share; and

  . the sale of 400,000 shares of common stock issuable to CCT Telecom in a
    private placement concurrent with this offering at a private placement
    price of $25.00 per share.

   See note 1 of notes to our consolidated financial statements for a
description of the method that we used to compute our basic and diluted net
loss per share. See "Capitalization".

                                       6
<PAGE>

                                  RISK FACTORS

   An investment in our common stock involves a high degree of risk. You should
carefully consider the risks and uncertainties described below and the other
information in this prospectus before deciding whether to invest in shares of
our common stock.

We have a history of losses, expect to continue to incur additional losses, and
may never achieve profitability.

   Through March 31, 2000 we incurred cumulative losses of $89.8 million, and
we expect to continue to incur losses in the future. If we do not become
profitable, the value of our stock will decrease. We have large fixed expenses,
and we plan to incur significant and increasing sales and marketing, research
and development, manufacturing, and general and administrative expenses. In
February 2000, we began to ship our first product, the ONLINE9000, and our
revenue to date has been limited. In order for us to become profitable, we will
need to generate and sustain higher revenue while maintaining reasonable cost
and expense levels.

   We expect our operating expenses to increase significantly as we increase
spending in order to fund more research and development, expand our sales and
marketing operations, broaden our customer support capabilities and develop new
distribution channels. We also plan to expand our general and administrative
functions to address the increased reporting and other administrative demands
that will result from being a public company and the expected growth of our
business. Our operating expenses are largely based on anticipated revenue
trends and a high percentage of our expenses are, and will continue to be,
fixed in the short term. As a result, a delay in generating or recognizing
revenue could cause significant variations in our operating results from
quarter to quarter and annually and could result in substantial operating
losses.

Our limited operating history makes forecasting our future revenue and
operating results difficult, which may impair our ability to manage our
business and your ability to assess our prospects.

   We commenced business as an independent company in December 1997 and
introduced our ONLINE9000 product in January 2000. Consequently, we have a
limited history upon which we can rely in planning and making the critical
decisions that will affect our future operating results. Similarly, because of
the relatively immature state of our business, it will be difficult for
investors to evaluate our prospects. We will need to make decisions in the
immediate future regarding resource allocations for research and development
and marketing and sales. If our predictions about the best use of our resources
turn out to be inaccurate, we may not make the best use of our resources and we
may forego better opportunities. Our limited history makes it difficult for
investors to gauge our capability in making these decisions.

The ONLINE9000 is our only currently available product and, if it is not
commercially successful, our revenue will not grow and we may not achieve
profitability.

   If our potential customers do not adopt, purchase and successfully deploy
our ONLINE9000 product in large numbers, our revenue may not grow and our
business, financial condition and results of operations will be seriously
harmed. Since the market for our products is relatively new, future demand for
our products is uncertain and will depend on the speed of adoption of optical
networking, in general, and optical equipment in metro networks, in particular.
No communications service provider has fully deployed the ONLINE9000 in large
network environments, and they may choose not to do so. Even if service
providers do deploy our product fully, it may not operate as expected, which
could delay or prevent its adoption.

                                       7
<PAGE>

If we fail to enhance existing products or to develop and achieve market
acceptance for new products that meet customer requirements, our sales will
suffer.

   The market in which we compete is characterized by more rapid technological
change than most, because it is newly emerging. As a result, we expect there to
be frequent new product introductions, changes in customer requirements and
evolving industry standards. We have no significant track record of our ability
to respond to these developments, and we may not be able to develop new
products or product enhancements in a timely manner, or at all. Because we are
new to this business, an investment in our stock is riskier than most.

Our new products and product enhancements may not achieve widespread market
acceptance.

   Any failure of our future products to achieve market acceptance could harm
our business and financial results. For example, we are developing a new
product, the ONLINE7000, for metro access applications. We have devoted and
expect to continue to devote significant engineering and financial resources to
the development and marketing of the ONLINE7000. Unexpected technical
challenges could prevent us from successfully developing the ONLINE7000 in a
timely manner or at all. In addition, the ONLINE7000 could be more costly to
develop and test than we anticipate. Even if we are able to develop and
introduce the ONLINE7000, it may not achieve market acceptance if it does not
include features or performance desired by customers or if competitors develop
products that customers prefer.

We expect that substantially all of our revenue will be generated from a small
number of customers, and our revenue will not grow if we do not sell products
to them in large numbers and if we do not add customers.

   We expect that substantially all of our revenue will depend on sales of our
products to a small number of customers and that our revenue will only grow if
these customers purchase substantial quantities of our products. We currently
have purchase agreements covering seven companies, four of which directly or
indirectly hold our equity securities. None of these companies is contractually
committed to purchase any minimum quantities of our products. If these
companies or future customers do not purchase large quantities of our products
for any reason, our ability to succeed would be harmed. The decision to
purchase substantial quantities of our products will depend, in part, on our
customers' and potential customers' desire and ability to introduce or expand
commercial services. We cannot be sure that any customer will introduce or
expand commercial services utilizing our products on a timely basis, if at all.
Any delay in introducing, or failure to introduce, these services would
seriously harm our revenue, results of operations and financial condition.

   In addition, if we fail to attract new customers, our growth will be
limited. The growth of our customer base could be limited by:

  . unwillingness of potential customers to adopt our optical networking
    architecture;

  . delays or difficulties in completing the development and introduction of
    our planned products or product enhancements;

  . failure of our products to perform as expected;

  . difficulties in meeting customers' delivery requirements;

  . introductions of new products by our competitors; and

  . other competitive factors such as aggressive pricing or financing by our
    competitors.

                                       8
<PAGE>

We face intense competition that could prevent us from growing and could
prevent us from becoming profitable.

   The market for communications equipment is rapidly evolving and is marked by
intense competition and technical innovations. We expect the pace of change to
accelerate in the future. We also expect many new competitors to emerge as the
market for optical networking equipment expands and evolves in response to
technical innovations and increasing demand for new broadband and wavelength-
based services. We currently compete with both public and private companies
providing solutions for network and bandwidth management in the metropolitan
market. Many of these companies have existing relationships with communication
service providers, making it more difficult for us to sell our products to
these potential customers.

   Some of our current and potential competitors are large public companies
that have longer operating histories, significantly greater financial,
technical and marketing resources, wider customer relationships and a broader
product line than we do. Consequently, these competitors are able to devote
greater resources to the development, promotion, sale and support of their
products. These large public companies are better positioned than we are to
acquire companies and new technologies that may displace our products or make
them obsolete. Any of these acquisitions could give the acquiring competitor a
strategic advantage. Unlike these large public companies, we have limited
ability to provide vendor-sponsored financing, which may influence the
purchasing decisions of prospective customers. In addition, a number of start-
up companies are attracting large amounts of capital and rapidly developing
competing technologies in an attempt to market products to communication
service providers. These private companies can offer investment opportunities
to induce potential customers to purchase their products.

We expect the average selling prices of our products to decline, which may
reduce gross margins and revenue.

   Our industry has experienced rapid erosion of average product selling
prices. We anticipate that the average selling prices of our products will
decline in response to competitive pressures, increased sales discounts, new
product introductions by our competitors or other factors. If we are unable to
achieve sufficient cost reductions and increases in sales volumes, this decline
in average selling prices will reduce our gross margins and revenue.

We face risks associated with our international operations that could limit our
sales and add to our cost of operations.

   We market and sell our products in the United States and internationally. We
intend to expand our international operations substantially and to enter new
international markets. This expansion will require significant management
attention and financial resources. We may not be able to maintain or increase
international market demand for our products.

   We have limited experience in marketing and distributing our products
internationally. International operations are subject to inherent risks,
including:

  . tariffs, export controls and other trade barriers;

  . longer accounts receivable payment cycles and difficulties in collecting
    accounts receivable;

  . difficulties and costs of staffing and managing foreign operations;

  . certification requirements with which we may be unfamiliar; and

  . reduced protection for intellectual property rights in some countries.

                                       9
<PAGE>

If we do not expand our direct sales operations, we may be unable to increase
market awareness and sales of our products.

   If we are unable to expand our direct sales force, we may not be able to
increase market awareness and sales of our products, which may prevent us from
achieving and maintaining profitability. Our products and services require a
technical sales effort targeted at several key people within each of our
prospective customers' organizations. Our sales efforts require the attention
of sales personnel and specialized system engineers with extensive experience
in networking technologies. Competition for these individuals is intense, and
we may not be able to hire sufficient numbers of qualified sales personnel and
specialized system engineers.

If we do not expand our customer service and support organization, we may be
unable to increase our sales.

   We currently have a small customer service and support organization and will
need to increase our staff to support new and existing customers. Our products
are complex and require highly-trained customer service and support personnel.
Hiring customer service and support personnel is difficult in our industry due
to the limited number of people available with the necessary technical skills.
If we are unable to expand our customer service and support organization, we
may not be able to increase sales.

We depend on sole or limited source suppliers for several key components of our
products, and if we are unable to buy these components on a timely basis, we
will not be able to deliver products to our customers.

   If we are unable to buy components on a timely basis, we will not be able to
deliver our products to customers, which would harm our sales and revenue. We
currently purchase several key components, including optical filters, optical
amplifiers, optical switches and electronic microprocessors, from limited
sources. In addition, we rely on a sole supplier for some optical components,
and we are required to purchase at least half of some optical components from
E-TEK Dynamics under our supply agreement with E-TEK. Optical components are
complex, and we may not be able to develop multiple or alternate sources of
supply in a timely manner, which could hurt our ability to deliver our products
to customers. Sole or limited source suppliers may be vulnerable to pressure
from large purchasers of their products, who may be competitors of ours, not to
sell their products to us.

We rely on contract manufacturers to produce our products, and our business
would be harmed if they were to stop meeting our manufacturing requirements.

   We rely on contract manufacturers to complete most of the manufacturing of
optical assemblies for our products. If for any reason these manufacturers were
to stop satisfying our needs without providing us with sufficient warning to
procure an alternate source, our ability to sell our products would be harmed.
Except for our agreement with E-TEK Dynamics, Inc., we have no material long
term contracts with our manufacturers. As a result, our contract manufacturers
are not obligated to supply products to us for any specific period, in any
specific quantity or at any certain price, except as may be provided in a
particular purchase order.

   The process of qualifying a new contract manufacturer for complex products
such as our optical assemblies is lengthy and would consume a substantial
amount of the time of our technical personnel and management. If we sought to
change manufacturers in a short period of time, our business would be
disrupted. In addition, we may be unsuccessful in identifying a new
manufacturer capable of and willing to meet our needs on terms that we would
find acceptable.

If we fail to predict our manufacturing and component requirements accurately,
we could incur additional costs or experience manufacturing delays.

   We provide forecasts of our demand to our contract manufacturers and
component vendors up to six months prior to scheduled delivery of products to
our customers. If we overestimate our

                                       10
<PAGE>

requirements, we may have excess inventory, which could increase our costs and
harm our relationships with our contract manufacturers and component vendors
due to reduced future orders. If we underestimate our requirements, we may have
an inadequate inventory of components and optical assemblies. Inadequate
inventory could interrupt manufacturing of our products and result in delays in
shipments. In addition, lead times for materials and components that we order
are long and depend on factors such as the procedures of, or contract terms
with, a specific supplier and demand for each component at a given time. In the
case of some optical components in short supply, component suppliers have
imposed strict allocations that limit the number of these components they will
supply to a given customer in a specified time period. These suppliers may
choose to increase allocations to larger, more established companies, which
could reduce our allocations and harm our ability to manufacture our products.

We expect that our revenue and operating results will vary significantly from
quarter to quarter, which may cause our stock price to decline.

   Our quarterly revenue and operating results are difficult to predict and may
fluctuate significantly from quarter to quarter. It is likely that in some
future quarters, our operating results may be below the expectations of market
analysts and investors, which could cause the trading price of our common stock
to fall.

   In addition, we expect to experience seasonality in the sales of our
products. Historically, the communications equipment market has higher sales in
the first and fourth quarters of the year, due in part to purchasers' budgetary
cycles. In addition, we expect that sales may decline during summer months,
particularly in European markets, which we expect to represent a significant
portion of the market for our products for the foreseeable future. These
seasonal variations in our sales may lead to fluctuations in our quarterly
operating results.

Due to the long sales cycle for our products, the timing of revenue is
difficult to predict and may cause our operating results to fluctuate
unexpectedly.

   The sales and deployment cycle for our products is lengthy; it may extend
for six months or more. The length of our sales cycle may cause our revenue and
operating results to vary unexpectedly from quarter to quarter. A customer's
decision to purchase our products involves a significant commitment of its
resources and a lengthy evaluation and product qualification process.
Consequently, we may incur substantial expenses and devote senior management
attention to potential relationships that never materialize, in which event our
investments will largely be lost and we may miss other opportunities. In
addition, our lengthy sales cycle makes it difficult to predict the quarter in
which we may recognize revenue from any sale.

If we do not manage growth, improve existing processes and implement new
systems, procedures and controls, we may use resources, including your
investment, inefficiently and we may not achieve profitability.

   We are still a relatively small company and our success depends on growth.
At December 31, 1998, we had 63 employees, at December 31, 1999, we had 202
employees and at March 31, 2000, we had 326 employees. We plan to hire a
significant number of additional employees this year. Our growth has placed,
and we expect it to continue to place, a significant strain on our management
systems and resources. We expect that we will need to continue to improve our
financial and managerial controls, reporting systems and procedures, and will
need to continue to expand, train and manage our work force worldwide.

                                       11
<PAGE>

If we are unable to hire additional qualified personnel as necessary, or if we
lose key personnel, we may be unable to manage or grow our business.

   If we are unable to identify, attract or retain qualified personnel or to
retain the services of key personnel, especially engineers and sales personnel,
it would be difficult for us to manage our business, make timely product
introductions and increase sales. We intend to continue to hire many
engineering, sales, marketing and support personnel. Competition for these
employees, particularly optical engineers, is intense, especially in the San
Francisco Bay area. We may not be successful in attracting and retaining
qualified personnel.

   Our future success depends upon the continued services of our executive
officers and other key engineering, sales, marketing and support personnel,
including Hugh C. Martin, our President, Chief Executive Officer and Chairman
of our board of directors. None of our officers or key employees is bound by an
employment agreement for any specific term, and we do not have "key person"
life insurance policies covering any of our employees.

If we or our employees become subject to unfair hiring claims, we could be
precluded from hiring needed personnel, incur substantial costs in defending
ourselves and incur damages.

   Companies in our industry frequently claim that their competitors have
engaged in unfair hiring practices. As a result of these types of claims, we
may incur damages, lose potential employees or encounter disruptions in the
operation of our business. We have received claims of this kind in the past and
we may receive claims of this kind in the future. In October 1999, Nortel
Networks filed suit against us seeking, among other things, an injunction
against us and several of our employees that were formerly employed by Nortel
Networks, to prevent us from hiring additional Nortel Networks employees. In
addition, the former employer of one of our employees sought an injunction and
obtained a temporary restraining order against him, and the employee was
prevented from continuing to work for us. We could incur substantial costs,
including management time and attention, in defending ourselves and our
employees against these types of claims, regardless of their merits.

Our success depends on our potential customers building new communications
systems and offering new communications services to their end-user customers,
which we have no ability to foresee or control.

   If our potential customers are not successful in building their
communications systems, promoting their products, including new revenue-
generating data services, receiving requisite approvals and accomplishing the
many other requirements for the success of their businesses, our growth will be
limited. Many factors in addition to the effectiveness of our products
influence the ultimate success of our customers, and we have no control over
these factors. In addition, we have limited ability to foresee the competitive
success of our customers and to plan accordingly.

If our products do not operate properly with other equipment in our customers'
networks, we may suffer product installations delays, order cancellations or
product returns, and our reputation could be harmed.

   Our products are designed to interface with our customers' existing
networks, each of which has its own specifications and is based on various
industry standards. Many of our customers' networks contain multiple
generations of products that were added as their networks grew and evolved. Our
products must interoperate with other existing and future products within these
networks. When interoperability problems occur, it may be difficult to identify
their source. Whether or not these problems are due to our products, they may
cause us to incur warranty, support and repair costs, divert the attention of
our engineering personnel from our product development efforts and suffer
customer relations problems.

                                       12
<PAGE>

Our products may have defects that we find only after full deployment in
complex networks, which could seriously harm our business.

   Our ONLINE9000 product, and its OPTX operating system and OLMP inter-network
communication protocol are technically advanced and highly complex and have
been deployed on only a limited basis. It is common for complex hardware and
software to have defects, some of which are significant, that are not
discovered in limited trials. The ONLINE9000, OPTX, OLMP and any future
products or releases can only be fully tested when deployed for an extended
period of time as part of networks that include equipment from other vendors.
Consequently, our customers may discover defects in our hardware or software
after deployment, and we could experience:

  . loss of or delay in revenue and loss of market share;

  . loss of customers;

  . damage to our reputation;

  . diversion of development resources;

  . increased service and warranty costs;

  . legal actions by customers exposing us to product liability claims and
    significant legal expenses; and

  . increased insurance costs.

Our products may become obsolete if we do not quickly meet industry standards
that may emerge.

   Our success depends in part on both the adoption of industry standards for
new technologies in our market and our products' compliance with industry
standards. To date, no industry standard for our products has been adopted. The
absence of an industry standard may prevent market acceptance of our products
if potential customers delay purchases of new equipment until standards are
adopted. In addition, if our products cannot support an industry standard,
potential customers may not choose our products. As a result, we may incur
significant losses due to lack of customer demand, excess inventory and
diversion of our engineers from product development efforts.

If we are unable to protect and enforce our intellectual property rights, we
may be unable to compete effectively.

   We regard substantial elements of our products and services as proprietary
and attempt to protect them by relying on patent, trademark, service mark,
copyright and trade secret laws. We also rely on confidentiality procedures and
contractual provisions with our employees, consultants and corporate partners.
Any steps we take to protect our intellectual property may be inadequate, time
consuming and expensive. Furthermore, despite our efforts, we may be unable to
prevent third parties from infringing upon or misappropriating our intellectual
property, which could harm our business.

   It is possible that no patents will be issued from our currently pending or
future patent applications. Moreover, any issued patents may not provide us
with any competitive advantages over, or may be challenged by, third parties.

   Because legal standards relating to the validity, enforceability and scope
of protection of intellectual property rights of software are uncertain and
still evolving, the future viability or value of our intellectual property
rights is uncertain. Effective patent, trademark, copyright and trade secret
protection may not be available in some countries in which our products are
distributed. Furthermore, our competitors may independently develop similar
technologies that limit the value of our intellectual property or design around
patents issued to us. See "Business--Intellectual Property".

                                       13
<PAGE>

Necessary licenses for third-party software may not be available to us or may
be very expensive.

   In the future, we may be required to license from third parties software
that is used in our products or is required to develop new products or product
enhancements. While we have been able to license third-party software to date,
in the future third-party licenses may not be available to us on commercially
reasonable terms or at all. Third parties who hold exclusive rights to software
technology that we seek to license may include our competitors. If we are
unable to obtain any necessary third-party licenses, we would be required to
redesign our product or obtain substitute technology, which may perform less
well, be of lower quality or be more costly.

We are involved in an intellectual property dispute and in the future we may
become involved in similar disputes, which could subject us to significant
liability, divert the time and attention of our management and prevent us from
selling our products.

   In March 2000, Nortel Networks filed suit against us in the United States
District Court for the Northern District of California. The suit alleges that
our products infringe five patents held by Nortel Networks, and sets forth
allegations of misappropriation of trade secrets, unlawful business practices
and common law unfair competition. We are in the preliminary stages of
investigating these allegations. Nortel Networks is seeking preliminary and
permanent injunctions and damages against us in connection with these claims.
If Nortel Networks is able to obtain an injunction preventing us from selling
our products, we would suffer a substantial reduction in our revenues and incur
losses over an extended period of time. We expect to incur substantial legal
and other expenses as well as diversion of management and technical time and
attention in connection with this litigation. The expenses and diversion of
resources associated with this litigation could seriously harm our business and
financial condition and could affect our ability to raise capital in the
future. In the event of an adverse ruling, we may be unable to sell our
products or be required to pay substantial damages to Nortel Networks, and if
this litigation is resolved by settlement, we might need to make substantial
payments to Nortel Networks. See "Business--Legal Proceedings".

   In the future, we may be a party to litigation to protect our intellectual
property or as a result of other alleged infringements of intellectual
property. These claims and any resulting lawsuit, if successful, could subject
us to significant liability for damages and invalidate our proprietary rights.
These lawsuits, regardless of their success, would be time-consuming and
expensive to resolve and would divert management time and attention. Any
potential intellectual property litigation also could force us to do one or
more of the following:

  . stop selling, incorporating or using our products that use the challenged
    intellectual property;

  . obtain from the owner of the infringed intellectual property right a
    license to sell or use the relevant technology, which license may not be
    available on reasonable terms, or at all; or

  . redesign those products that use the challenged technology.

   If we are forced to take any of these actions, our business may be harmed.
Although we carry general liability insurance, our insurance may not cover
potential claims of this type or may not be adequate to indemnify us for all
liability that may be imposed. For more information concerning our intellectual
property rights, see "Business--Intellectual Property".

We may not be able to obtain additional financing to satisfy our future capital
needs.

   Unlike many companies, we intend to expand our sales and marketing
activities, manufacturing activities and inventory faster than increases in
actual or forecasted revenue. If we achieve our growth targets, our working
capital needs will increase, so we may need to raise additional capital in
order to fund expansion. We may also need additional capital in order to
develop new services or

                                       14
<PAGE>

products, or to acquire complementary services, businesses or technologies.
Product development and acquisition activities are particularly capital-
intensive in our industry. Additional financing may not be available on terms
favorable to us, or at all. Future debt financing may limit our financial and
operating flexibility. If we issue additional equity securities, stockholders
may experience additional dilution or the new equity securities may have
rights, preferences or privileges senior to those of the then-existing holders
of common stock.

Any acquisitions we make could disrupt our business and harm our financial
condition.

   We intend to acquire or invest in complementary businesses, products and
technologies. We may not successfully integrate any businesses, products,
technologies or personnel that we might acquire in the future, and, as a
result, our operating results could suffer. These acquisitions or investments
could lead to:

  . stock issuances that would reduce our current stockholders' percentage
    ownership;

  . debt that will give rise to interest charges and may impose material
    restrictions on the manner in which we operate our business;

  . responsibility for unanticipated liabilities;

  . amortization expenses related to goodwill and other intangible assets;

  . large and immediate write-offs;

  . problems combining the purchased operations, technologies or products
    with ours;

  . unanticipated costs;

  . diversion of management's attention from our core business;

  . adverse effects on existing relationships with suppliers and customers;

  . risks associated with entering markets in which we have limited prior
    experience; or

  . potential loss of key employees, particularly those of the acquired
    organizations.

The continuing control of ONI Systems by insiders after this offering could
delay or prevent a change in corporate control, which could prevent you from
realizing a premium over the market price of our common stock.

   As of March 31, 2000, our executive officers, directors and entities
affiliated with them beneficially owned approximately 37.3% of our outstanding
common stock. We anticipate that the executive officers, directors and entities
affiliated with them will, in the aggregate, beneficially own approximately
34.5% of our outstanding common stock following the completion of this
offering. These stockholders, if acting together, would be able to influence
all matters requiring approval by our stockholders, including the election of
directors and the approval of mergers or other business combination
transactions. This ability to exercise influence over all matters requiring
stockholder approval could prevent or significantly delay another company or
person from acquiring or merging with us. As a result, offers to acquire ONI
Systems which represent a premium over the available market price of our common
stock may be withdrawn or otherwise fail to be realized. See "Principal
Stockholders".

The continuing control of ONI Systems by insiders after this offering could
permit insiders to engage in transactions to the detriment of stockholder
value.

   We have engaged in transactions with related parties, including loans to
executive officers. The ability of executive officers, directors and their
affiliated entities to exercise influence over all matters

                                       15
<PAGE>

requiring stockholder approval could enable insiders to approve transactions
involving each other that might otherwise not be approved and which could
reduce the market price of our common stock. See "Related Party Transactions".

We expect to experience volatility in our share price which could negatively
affect your investment.

   The market price of our common stock may fluctuate significantly in response
to a number of factors, some of which are beyond our control, including:

  . changes in financial estimates by securities analysts;

  . changes in market valuations of communications and Internet
    infrastructure-related companies;

  . announcements, by us or our competitors, of new products or of
    significant acquisitions, strategic partnerships or joint ventures; and

  . volume fluctuations, which are particularly common among highly volatile
    securities of Internet-related companies.

Stock market volatility has increased, making your investment more risky and
litigation more likely.

   The stock markets, particularly the Nasdaq National Market on which our
common stock has been approved for listing, have experienced substantial price
and volume fluctuations. These fluctuations have particularly affected the
market prices of equity securities of many technology, networking and Internet-
related companies and have often been unrelated or disproportionate to the
operating performance of those companies. In the past, following periods of
volatility in the market price of a company's securities, securities class
action litigation has often been instituted against that company. Litigation,
if instituted, could result in substantial costs and a diversion of
management's attention and resources.

There may be sales of a substantial amount of our common stock after this
offering that could cause our stock price to fall.

   Our current stockholders hold a substantial number of shares, which they
will be able to sell in the public market in the near future. Immediately after
this offering, in addition to the shares offered by this prospectus,
approximately 849,636 shares may be resold without limitation; 180 days later,
an additional 101,125,721 shares may be resold; and a further 13,693,115 shares
may be resold at various times thereafter. Sales of a substantial number of
shares of our common stock after this offering could cause our stock price to
fall. In addition, the future sale of shares by existing stockholders could
impair our ability to raise capital through the sale of additional stock. See
"Shares Eligible for Future Sale".

Provisions of Delaware law, our certificate of incorporation and our bylaws
could delay or prevent a takeover of us, which could prevent you from realizing
a premium over the market price of our common stock.

   Provisions of Delaware law, our certificate of incorporation and bylaws
could have the effect of delaying or preventing a third party from acquiring
us, even if a change in control would be beneficial to our stockholders. These
provisions include:

  . authorizing the issuance of preferred stock without stockholder approval;

  . providing for a classified board of directors with staggered, three year
    terms;

                                       16
<PAGE>

  . prohibiting cumulative voting in the election of directors;

  . prohibiting stockholders from calling stockholders meetings; and

  . prohibiting stockholder actions by written consent.

   These provisions and other provisions of Delaware law could make it more
difficult for a third party to acquire us, even if doing so would benefit our
stockholders. As a result, offers to acquire ONI Systems which represent a
premium over the available market price of our common stock may be withdrawn or
otherwise fail to be realized. For a further discussion of these provisions,
see "Description of Capital Stock--Anti-Takeover Provisions".

                                       17
<PAGE>

               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

   This prospectus contains forward-looking statements that involve substantial
risks and uncertainties. These forward-looking statements are not historical
facts, but rather are based on current expectations, estimates and projections
about our industry, our beliefs and our assumptions. Words such as
"anticipates", "expects", "intends", "plans", "believes", "seeks" and
"estimates", and variations of these words and similar expressions, are
intended to identify forward-looking statements. These statements are not
guarantees of future performance and are subject to risks, uncertainties and
other factors, some of which are beyond our control and difficult to predict
and could cause actual results to differ materially from those expressed or
forecasted in the forward-looking statements. These risks and uncertainties
include those described in "Risk Factors" and elsewhere in this prospectus.
These forward-looking statements reflect our view only as of the date of this
prospectus.

                              RECENT DEVELOPMENTS

   In March 2000, we agreed to sell $4.0 million of common stock to Internet
Initiative Japan Inc. at the initial public offering price, representing
160,000 shares of common stock, in a private placement that will close
concurrently with this offering. Internet Initiative Japan will be granted the
right to include these shares in future registered offerings that we may file.
We also entered into a trial system purchase agreement with Internet Initiative
Japan for our ONLINE9000 product in April 2000.

   In April 2000, we agreed to sell $10.0 million of common stock to CCT
Telecom Holdings Limited at the initial public offering price, representing
400,000 shares of common stock, in a private placement that will close
concurrently with this offering. CCT Telecom will be granted the right to
include these shares in future registered offerings that we may file.

   In May 2000, we sold 1,333,333 shares of Series H preferred stock to Sun
Microsystems, Inc. at a price per share of $15.00 for an aggregate purchase
price of $20.0 million in a private placement. Sun Microsystems was granted the
right to include these shares in future registered offerings that we may file.
The number of shares of common stock to be issued on conversion is computed
using a 17.5% discount off of the per share price in this offering. These
shares of Series H preferred stock will automatically convert into 969,697
shares of common stock upon the closing of this offering.

                                       18
<PAGE>

                                USE OF PROCEEDS

   We estimate that our net proceeds from the sale of the 8,000,000 shares of
common stock that we are offering will be approximately $184.5 million, at the
initial public offering price of $25.00 per share, after deducting the
underwriting discount and estimated offering expenses. If the underwriters'
option to purchase additional shares in this offering is exercised in full, we
estimate that our net proceeds will be approximately $212.4 million. In
addition, we expect to receive:

  . $4.0 million net proceeds from the sale of shares of common stock in a
    private placement to Internet Initiative Japan, concurrent with the
    completion of this offering; and

  . $10.0 million net proceeds from the sale of shares of common stock in a
    private placement to CCT Telecom, concurrent with the completion of this
    offering.

   The principal purposes of this offering are to obtain additional capital, to
create a public market for our common stock, to enhance our ability to acquire
other businesses, products or technologies and to facilitate future access to
public equity markets. We intend to use the net proceeds for working capital,
capital expenditures and other general corporate purposes. We may also use a
portion of the net proceeds from this offering to acquire or invest in
businesses, technologies or products that are complementary to our business. We
currently have no commitments or agreements with respect to any acquisitions or
investments. We have not determined the amounts we plan to spend on any of the
uses described above or the timing of these expenditures. Pending our use of
the net proceeds, we intend to invest them in short-term, interest-bearing,
investment-grade securities.

                                DIVIDEND POLICY

   We have never declared or paid any cash dividends on our capital stock and
do not anticipate paying any cash dividends in the foreseeable future.

                                       19
<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 shares of preferred stock into common stock upon the closing
    of this offering;

  . on a further pro forma basis to reflect the May 2000 sale of 1,333,333
    shares of Series H preferred stock to Sun Microsystems in a private
    placement for a price of $15.00 per share, which will convert into
    969,697 shares of common stock; and

  . on a pro forma as adjusted basis to reflect:

   . the sale of 8,000,000 shares of common stock in this offering at the
     initial public offering price of $25.00 per share, after deducting the
     underwriting discount and our estimated offering expenses;

   . the sale of 160,000 shares of common stock to Internet Initiative Japan
     in a private placement, concurrent with this offering, at a private
     placement price of $25.00 per share; and

   . the sale of 400,000 shares of common stock issuable to CCT Telecom in a
     private placement, concurrent with this offering, at a private
     placement price of $25.00 per share.

   In the period of its conversion, the beneficial conversion feature of the
Series H preferred stock will increase the net loss attributable to common
stockholders by approximately $4,242,000 and increase the basic and diluted net
loss per share.

<TABLE>
<CAPTION>
                                               As of March 31, 2000
                                      ------------------------------------------
                                                             Pro
                                                            Forma     Pro Forma
                                       Actual   Pro Forma  Series H  As Adjusted
                                      --------  ---------  --------  -----------
                                        (in thousands, except share and per
                                                    share data)
<S>                                   <C>       <C>        <C>       <C>
Capital-lease obligations............ $    466  $    466   $    466   $    466
Stockholders' equity:
  Preferred Stock, $0.0001 par value
   per share, 80,309,408 shares
   authorized, 79,194,900 shares
   issued and outstanding, actual;
   10,000,000 shares authorized and
   no shares issued and outstanding,
   pro forma, pro forma Series H or
   pro forma as adjusted.............        8        --         --         --
  Common stock, $0.0001 par value per
   share, 159,690,592 shares
   authorized, 34,943,875 shares
   issued and outstanding, actual;
   159,690,592 shares authorized,
   114,138,775 shares issued and
   outstanding, pro forma;
   115,108,472 shares issued and
   outstanding, pro forma Series H;
   700,000,000 shares authorized,
   123,668,472 shares issued and
   outstanding, pro forma as
   adjusted..........................        4        12         12         13
  Additional paid-in capital.........  268,176   268,176    288,176    486,650
  Notes receivable from stockholders.   (8,430)   (8,430)    (8,430)    (8,430)
  Services receivable from
   stockholder.......................      (49)      (49)       (49)       (49)
  Deferred stock compensation........  (91,220)  (91,220)   (91,220)   (91,220)
  Accumulated deficit................  (89,790)  (89,790)   (89,790)   (89,790)
                                      --------  --------   --------   --------
    Total stockholders' equity.......   78,699    78,699     98,699    297,174
                                      --------  --------   --------   --------
      Total capitalization........... $ 79,165  $ 79,165   $ 99,165   $297,640
                                      ========  ========   ========   ========
</TABLE>

                                       20
<PAGE>

   The outstanding share information in the preceding table excludes:

  . 19,343,345 shares of common stock subject to options outstanding under
    our stock incentive plans with a weighted average exercise price of $0.64
    per share, and 1,377,819 shares of common stock available for future
    grant under these plans; and

  . 1,434,394 shares of common stock issuable upon the exercise of
    outstanding warrants with a weighted average exercise price of $2.72 per
    share.

   From April 1, 2000 through May 15, 2000, we granted options to purchase
2,680,000 shares of common stock with a weighted average exercise price of
$8.02 per share. Of these shares, 1,000,000 shares will be subject to an option
that is outside of the stock plans described in this prospectus. In April 2000,
we adopted our 2000 equity incentive plan, under which 7,000,000 shares of
common stock will be available for future grant, and our 2000 employee stock
purchase plan, under which 1,000,000 shares of common stock will be available
for future grant.

   You should read this table together with "Management--Director
Compensation", "Management--Employee Benefit Plans", "Description of Capital
Stock", "Related Party Transactions" and notes 7, 9, 12 and 13 of the notes to
our consolidated financial statements.

                                       21
<PAGE>

                                    DILUTION

   If you invest in our common stock, your interest will be diluted to the
extent of the difference between the initial public offering price per share of
our common stock and the pro forma as adjusted net tangible book value per
share of our common stock after this offering. Net tangible book value is equal
to total assets less intangible assets and total liabilities.

   Our pro forma net tangible book value as of March 31, 2000 was $74.6
million, or approximately $0.65 per share assuming the conversion of all
outstanding shares of preferred stock into shares of common stock. Pro forma
net tangible book value per share is determined by dividing the pro forma
number of outstanding shares of common stock into our net tangible book value.

   After giving effect to the receipt of:

  . the estimated net proceeds from this offering after deducting the
    underwriting discount and estimated offering expenses;

  . net proceeds of $20.0 million from the May 2000 sale of Series H
    preferred stock in a private placement to Sun Microsystems;

  . net proceeds of $4.0 million we expect to receive from the sale of common
    stock in a private placement to Internet Initiative Japan, concurrent
    with this offering; and

  . net proceeds of $10.0 million we expect to receive from the sale of
    common stock in a private placement to CCT Telecom, concurrent with this
    offering;

our pro forma net tangible book value as of March 31, 2000 would have been
approximately $293.1 million, or $2.37 per share. This represents an immediate
increase in pro forma net tangible book value of $0.17 attributable to the
Series H investor and $1.55 attributable to new investors, or a total increase
of $1.72 per share to existing stockholders, and an immediate dilution in net
tangible book value of $22.63 per share to new investors purchasing shares at
the initial public offering price. The following table illustrates the per
share dilution:

<TABLE>
   <S>                                                             <C>   <C>
   Initial public offering price per share........................       $25.00
   Pro forma net tangible book value per share as of March 31,
    2000.......................................................... $0.65
   Increase in pro forma net tangible book value per share
    attributable to the Series H investor.........................  0.17
   Increase in pro forma net tangible book value per share
    attributable to new investors.................................  1.55
                                                                   -----
   Pro forma as adjusted net tangible book value per share after
    offering......................................................         2.37
                                                                         ------
   Dilution per share to new investors............................       $22.63
                                                                         ======
</TABLE>

   The following table summarizes as of March 31, 2000, on the pro forma basis
described above, the number of shares of common stock purchased from us, the
total consideration paid to us and the average price per share paid to us by
existing stockholders and by investors purchasing shares of our common stock in
this offering, before deducting the underwriting discount and our estimated
offering expenses:

<TABLE>
<CAPTION>
                          Shares Purchased   Total Consideration
                         ------------------- -------------------- Average Price
                           Number    Percent    Amount    Percent   Per Share
                         ----------- ------- ------------ ------- -------------
<S>                      <C>         <C>     <C>          <C>     <C>
Existing stockholders... 114,138,775   92.3% $134,884,904   36.6%    $ 1.18
Series H investor.......     969,697    0.8    19,999,995    5.4      20.62
New investors...........   8,560,000    6.9   214,000,000   58.0      25.00
                         -----------  -----  ------------  -----
  Total................. 123,668,472  100.0% $368,884,899  100.0%
                         ===========  =====  ============  =====
</TABLE>

                                       22
<PAGE>

   As of March 31, 2000, there were options outstanding to purchase a total of
19,343,345 shares of our common stock, with a weighted average exercise price
of $0.64 per share and warrants outstanding to purchase a total of 1,434,394
shares of our common stock with a weighted average exercise price of $2.72 per
share. From April 1, 2000 through May 15, 2000, we granted options to purchase
2,680,000 shares of common stock with a weighted average exercise price of
$8.02 per share. Of these shares, 1,000,000 shares will be subject to an option
that is outside of the stock plans described in this prospectus. To the extent
that any options or warrants are exercised, there will be further dilution to
new public investors. See "Capitalization", "Management--Employee Benefit
Plans", "Description of Capital Stock", "Related Party Transactions" and notes
7, 9, 12 and 13 of the notes to our consolidated financial statements.

                                       23
<PAGE>

                      SELECTED CONSOLIDATED FINANCIAL DATA
                     (in thousands, except per share data)

   The following selected consolidated financial data should be read in
conjunction with, and are qualified by reference to, our consolidated financial
statements and related notes to our financial statements and Management's
Discussion and Analysis of Financial Condition and Results of Operations. The
consolidated statement of operations data set forth below for the period from
October 20, 1997 (inception) to December 31, 1997, and for the fiscal years
ended December 31, 1998 and 1999, and the consolidated balance sheet data as of
December 31, 1998 and 1999 have been derived from our consolidated financial
statements, which have been audited by KPMG LLP, independent auditors, and are
included elsewhere in this prospectus. The consolidated statement of operations
data for the periods ended March 31, 1999 and 2000, and the balance sheet data
as of March 31, 2000, are unaudited but include all adjustments, consisting
only of normal recurring adjustments, which are considered necessary for a fair
presentation of the data. The historical results are not necessarily indicative
of results to be expected for any future period. For an explanation of the
determination of the shares used to compute net loss per share and pro forma
net loss per share, see note 1(r) of our notes to consolidated financial
statements.

   In the period of its conversion, the beneficial conversion feature of the
Series H preferred stock will increase the net loss attributable to common
stockholders by approximately $4,242,000 and increase the basic and diluted net
loss per share.

<TABLE>
<CAPTION>
                                                 Year Ended        Three Months
                               Period From      December 31,     Ended March 31,
                            October 20, 1997  -----------------  -----------------
Consolidated Statements of   (Inception) to
Operations Data             December 31, 1997  1998      1999     1999      2000
--------------------------  ----------------- -------  --------  -------  --------
                                                                   (unaudited)
<S>                         <C>               <C>      <C>       <C>      <C>
Revenue...................       $   --       $ 1,733  $  3,034  $   565  $  3,633
 Cost of revenue..........           --         1,208     1,032      425     2,850
                                 ------       -------  --------  -------  --------
   Gross profit...........           --           525     2,002      140       783
                                 ------       -------  --------  -------  --------
Operating expenses:
 Research and
  development, excluding
  deferred stock
  compensation
  amortization amounts ...           39         4,009    25,400    2,850    12,037
 Sales and marketing,
  excluding deferred
  stock compensation
  amortization amounts....           21           649     4,557      426     3,002
 General and
  administrative,
  excluding deferred
  stock compensation
  amortization amounts ...           49         1,591     4,756      510     2,556
 Amortization of deferred
  stock compensation......           89         3,310    11,422    1,296    13,612
 Common stock warrant
  expense ................           --            --     2,891       --     4,545
 In-process research and
  development.............           --            --       170       --        --
                                 ------       -------  --------  -------  --------
   Total operating
    expenses..............          198         9,559    49,195    5,082    35,752
                                 ------       -------  --------  -------  --------
   Operating loss.........         (198)       (9,034)  (47,193)  (4,942)  (34,969)
Interest income (expense),
 net......................           (1)          183       623      181       868
Other income (expense),
 net......................           --            --        --      (14)      (63)
                                 ------       -------  --------  -------  --------
   Loss before income
    taxes.................         (199)       (8,851)  (46,570)  (4,775)  (34,164)
Income taxes..............           --             1         2        2         3
                                 ------       -------  --------  -------  --------
   Net loss...............       $ (199)      $(8,852) $(46,572) $(4,777) $(34,167)
                                 ======       =======  ========  =======  ========
Basic and diluted net loss
 per share................       $(0.77)      $ (0.74) $  (2.58) $ (0.35) $  (1.41)
Weighted-average shares
 outstanding used in
 computing basic and
 diluted net loss per
 share....................          257        11,919    18,043   13,542    24,219
Pro forma basic and
 diluted net loss per
 share....................                             $  (0.60)          $  (0.33)
Shares used in computing
 pro forma basic and
 diluted net loss per
 share ...................                               78,025            103,154
</TABLE>

<TABLE>
<CAPTION>
                                          December 31, December 31,  March 31,
Balance Sheet Data                            1998         1999        2000
------------------                        ------------ ------------ -----------
                                                                    (unaudited)
<S>                                       <C>          <C>          <C>
Cash and cash equivalents................   $19,092      $ 80,023     $50,307
Working capital..........................    19,627        81,758      59,101
Total assets.............................    21,312       100,942      95,869
Capital lease obligations, less current
 portion.................................        79           367         295
Total stockholders' equity...............   $20,565      $ 91,728     $78,699
</TABLE>

                                       24
<PAGE>

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

Overview

   We develop, market and sell optical networking equipment specifically
designed to address the bandwidth and service limitations of metropolitan and
regional networks. From our inception in October 1997 through November 1999,
our operating activities consisted primarily of research and development. We
also formed and expanded our administrative, marketing, sales, manufacturing
and customer service and support organizations and commenced sales and
marketing activities. In January 2000, we released our first product, the
ONLINE9000, which is a combined hardware and software product for optical
transmission and routing of voice, Internet and other data communication
services.

   In October 1997, Optical Networks, Incorporated, our California predecessor,
was formed as a subsidiary of Optivision, Inc. In December 1997, we were spun
out of Optivision and Optivision distributed its holdings of our common stock
and half of its holdings of our preferred stock to Optivision shareholders.
Optivision also retained 4,000,000 shares of our Series A preferred stock. In
connection with the spin-out, we have reserved, and are obligated to issue,
233,468 shares of our common stock upon the exercise of warrants to purchase
capital stock of Optivision. We will not receive any proceeds from the exercise
of these warrants. In January 1998, all of the shares of our Series A preferred
stock were converted into Series B preferred stock on a one-to-one basis. In
January 1998, Optivision sold 2,666,667 shares of our preferred stock to our
initial venture investors. In March 1998, we repurchased all of our outstanding
stock owned by Optivision, consisting of 1,333,333 shares of our Series B
preferred stock, for an aggregate purchase price of $1.0 million. Optivision
does not currently own any shares of ONI Systems. See "Related Party
Transactions--Optivision Spin-out" and note 5 of notes to our consolidated
financial statements.

   In June 1999, we acquired all of the outstanding common shares of Object-
Mart, Inc. in exchange for 4,569,276 shares of our common stock and
approximately $3.2 million in cash. Object- Mart was located in San Jose,
California, and provided software products and services to software equipment
manufacturers in the telecommunications industry. The combination was accounted
for using the purchase method and, accordingly, the results of operations of
Object-Mart have been included in our consolidated financial statements since
June 29, 1999. Upon consummation of this acquisition, we recorded goodwill of
$5.7 million that is to be amortized over a period of two years. As of March
31, 2000, the remaining unamortized goodwill was $3.5 million.

   Since our inception, we have incurred significant losses, and as of March
31, 2000, we had an accumulated deficit of $89.8 million. We have not achieved
profitability on a quarterly or annual basis. We expect to incur significant
sales and marketing, research and development and general and administrative
expenses and, as a result, will need to generate significant revenue to achieve
and maintain profitability.

   On January 31, 2000, we announced general availability of our first product,
the ONLINE9000, which we began to ship in February 2000. In March 2000, we
recognized revenue from sales of this product to four customers. For the three
months ended March 31, 2000, sales to Williams Communications, Inc., COLT
Telecom plc, Marietta Fibernet and StorageNetworks, Inc. accounted for 33%,
30%, 23% and 14% of revenue, respectively. Sales to COLT Telecom, which is
based in the United Kingdom, are denominated in United States Dollars. While we
will continue to seek to diversify and grow our customer base, we anticipate
that our operating results for any given period may depend on a small number of
customers. In April 2000, we entered into a limited trial system purchase
agreement with Internet Initiative Japan Inc. and an OEM relationship with
Lucent Technologies, Inc. We plan to introduce new products, including the
ONLINE7000, and product enhancements, although we may be unsuccessful in these
efforts.

                                       25
<PAGE>

   We primarily market and sell our products through our direct sales force and
marketing organization. We are expanding our direct sales force to sell to
potential customers outside of North America and Europe. However, in those
markets where it is difficult to maintain a direct sales force, we may rely on
resellers for distribution of our product. For example, in April 2000, we
entered into an OEM relationship with Lucent Technologies that expires on
December 31, 2001. Under the terms of our agreement, Lucent Technologies has
the exclusive right to sell some of our products in China for a period of 12
months.

   Our policy is to recognize revenue at the time of shipment unless we have
future obligations or customer acceptance is required, in which case all or a
portion of revenue is deferred until these obligations are met or the customer
accepts the product. Services revenue consists primarily of training and
installation services and associated revenue is recognized as the services are
performed. To date, we have not been obligated to provide installation services
to our customers. We provide a limited warranty on our products. Estimated
expenses for warranty obligations are recorded at the time revenue is
recognized.

   Our cost of revenue consists of raw materials, direct labor, manufacturing
overhead and amounts paid to third-party manufacturers. Our manufacturing
operations are generally outsourced, and accordingly a significant portion of
our cost of revenue consists of payments to third-party contract manufacturers.
We conduct supply chain management, production engineering, documentation
control, quality assurance and final assembly at our assembly facility in San
Jose, California. We currently purchase many of our electronic and optical
components through purchase orders. In order to help us maintain our supply of
components, especially optical components, we intend to enter into long-term
supply agreements with vendors. For example, in March 2000, we entered into an
agreement with E-TEK Dynamics, Inc., under which E-TEK Dynamics will supply
optical components and module integration services to us at least through
December 31, 2001.

   Research and development expenses consist primarily of salaries and related
expenses for research and development personnel, fees paid to outside
consultants, non-recurring engineering charges and prototype costs related to
design, development, testing and enhancement of our products. We expense all of
our research and development costs as they are incurred. We believe that
research and development is critical to our strategic objectives, and we devote
substantial resources to the development of new products and product features.
We also believe that to meet our customers' evolving needs, we will need to
fund investments in several development projects simultaneously. As a result,
we expect our research and development expenses to increase in absolute dollars
in the future.

   Sales and marketing expenses consist of salaries and related expenses for
personnel engaged in marketing, sales, and customer service and support
functions, as well as costs associated with trade shows, promotional activities
and public relations. We expect that sales and marketing expenses will increase
substantially in absolute dollars as we continue to build and expand our direct
sales, marketing, and customer service and support organizations in the United
States and internationally.

   General and administrative expenses consist primarily of salaries and
related expenses for executive, finance, legal, facilities and human resources
personnel, recruiting expenses, professional fees and other corporate expenses.
We expect general and administrative expenses to increase in absolute dollars
as we add personnel, improve and expand our information system infrastructure
and incur additional expenses as we grow and operate as a public company.
Nortel Networks has initiated litigation against us involving both employment-
related and intellectual property-related claims. We expect that the costs of
defending these lawsuits will be substantial, and that management time and
attention will be diverted to them, regardless of their merit. We entered into
a lease for a new facility in May 2000. We paid the deposit required to secure
this facility, approximately $1.3 million, and the first month's rent,
approximately $700,000, at the time that the lease was signed. The lease term
is for a period of 120 months, commencing on February 1, 2001. The expected
rent will be approximately $7.9 million for the first year, $8.2 million for
the second

                                       26
<PAGE>

year, $10.6 million for the third year and $11.0 million for the fourth year.
Thereafter, the base rent will increase by 4% per year.

   In 1998, we recorded total deferred stock compensation of approximately $8.4
million in connection with stock sales and stock options granted during 1998 at
prices subsequently deemed to be below fair value on the date of sale or grant.
Options granted are typically subject to a four-year vesting period. We are
amortizing the deferred stock compensation over the vesting periods of the
applicable options and the repurchase periods for restricted stock purchases.
The period over which deferred stock compensation is amortized is determined
separately for each 25% portion of the total award, in accordance with
Financial Accounting Standards Board Interpretation No. 28. The result of this
accounting treatment is that approximately 59% of the unearned deferred
compensation will be amortized in the first year, 25% in the second year, 12%
in the third year and 4% in the fourth year following the date of the grant. We
amortized $3.3 million of deferred stock compensation in the year ended
December 31, 1998. For the year ended December 31, 1999 and for the quarter
ended March 31, 2000, we recorded approximately $41.7 million, and $66.7
million, respectively, in additional deferred stock compensation for stock
options granted at prices subsequently deemed to be below fair value on the
date of grant. We amortized a total of approximately $11.4 million and $13.6
million of deferred stock compensation in the year ended December 31, 1999 and
the quarter ended March 31, 2000, respectively. Approximately $35.5 million and
$91.2 million of deferred stock compensation related to all prior issuances
remained to be amortized over four years as of December 31, 1999 and March 31,
2000, respectively.

   In May 2000, we granted to Chris A. Davis, our new Executive Vice President,
Chief Financial and Administrative Officer, an option to purchase 1,000,000
shares of common stock outside of the stock plans described in this prospectus
with an exercise price of $4.00 per share. This grant will result in additional
deferred stock compensation of $10.0 million, which will be amortized over four
years from the date of grant. In connection with options to purchase an
additional 1,680,000 shares of common stock at a weighted average exercise
price of $10.41 per share, granted from April 1, 2000 through May 15, 2000, we
have an additional deferred compensation expense of $6.2 million.

Results of Operations

   We plan to increase our operating expenses significantly in order to fund
greater levels of research and development, expand our sales and marketing
operations, broaden our customer support capabilities and develop new
distribution channels. We also plan to expand our general and administrative
functions to address the increased reporting and other administrative demands
that will result from being a publicly traded company and the increasing size
of our business. Our operating expenses are largely based on anticipated
revenue trends and a high percentage of our expenses are, and will continue to
be, fixed in the short term. As a result, a delay in generating or recognizing
revenue could cause significant variations in our operating results from
quarter-to-quarter and could result in substantial operating losses.

   In addition, we expect to experience seasonality in the sales of our
products. Historically, the telecommunications equipment market has experienced
increased sales in the first and fourth quarter of the year due in part to
purchasers' budgetary cycles. In addition, we expect that sales may decline
during summer months, particularly in European markets which we expect to
represent a substantial portion of the market for our products for the
foreseeable future. These seasonal variations in our sales may lead to
fluctuations in our quarterly operating results.

 Comparison of Three Months Ended March 31, 1999 and 2000

 Net Revenue

   Net revenue increased by $3.1 million, or 543%, from $565,000 for the three
months ended March 31, 1999 to $3.6 million for the three months ended March
31, 2000. All of the net revenue for the three months ended March 31, 2000 was
from sales of our ONLINE9000 product. Net revenue

                                       27
<PAGE>

recorded for the three months ended March 31, 1999 was from government research
and development contracts. The government research and development contracts
were completed in June 1999.

 Cost of revenue

   Cost of revenue increased by $2.4 million, or 572%, from $425,000 for the
three months ended March 31, 1999 to $2.8 million for the three months ended
March 31, 2000. As a percentage of net revenue, cost of revenue for the three
months ended March 31, 2000 was 78%, compared to 75% for the three months ended
March 31, 1999. We believe the comparison of these two periods is not
meaningful, because our revenue for the three months ended March 31, 1999, and
the related cost of revenue, were from governmental research and development
contracts. Cost of revenue as a percentage of revenue for the three months
ended March 31, 2000 are higher than they are anticipated to be in the future,
due to the high cost of initial start-up of production, including the increase
in personnel and the low volume of sales.

   We expect to develop additional products in the future such that the product
mix of our sales may vary. Correspondingly, we expect the quarterly gross
profit percentages to fluctuate in accordance to the product mix of related
quarterly sales.

 Research and development expense

   Research and development expense was $2.8 million for the three months ended
March 31, 1999, and increased by 322% to $12.0 million for the three months
ended March 31, 2000, representing 56% and 34% of the total quarterly operating
expenses for the three months ended March 31, 1999 and 2000, respectively. The
increase in quarterly research and development expense is primarily due to the
significant expansion of our research and development department, particularly
attributable to the increase of engineering staff. As of March 31, 1999, we had
approximately 51 research and development employees and approximately 147 as of
March 31, 2000.

 Sales and marketing expense

   Sales and marketing expense was $426,000 for the three months ended March
31, 1999, and increased by 605% to $3.0 million for the three months ended
March 31, 2000, representing 8% and 8% of total quarterly operating expenses
for the three months ended March 31, 1999 and 2000, respectively. This increase
in quarterly sales and marketing expense is primarily due to the higher number
of sales and marketing personnel in the quarter ended March 31, 2000 as
compared to that of March 31, 1999. As of March 31, 1999, we had approximately
four sales and marketing personnel, and 59 as of March 31, 2000.

 General and administrative expense

   General and administrative expense was $510,000 for the three months ended
March 31, 1999, and increased by 401% to $2.6 million for the three months
ended March 31, 2000, representing 10% and 7% of the total quarterly operating
expenses for the three months ended March 31, 1999 and 2000, respectively. This
increase in quarterly general and administrative expense primarily reflects
personnel increases. As of March 31, 1999, we had 12 general and administrative
employees and 52 as of March 31, 2000.

 Amortization of deferred stock compensation

   Amortization of deferred stock compensation was $1.3 million for the three
months ended March 31, 1999, and increased by 950% to $13.6 million for the
three months ended March 31, 2000. This increase in quarterly amortization of
deferred stock compensation was primarily a result of higher deferred stock
compensation expense, which increased from $5.2 million as of December 31, 1998
to $35.5 million as of December 31, 1999.

                                       28
<PAGE>

 Common stock warrant expense

   In February 2000, in connection with the signing of a purchase and license
agreement with FMR Corp. for the purchase of our products by KVH Industries
Inc. and MetroRED Telecommunicaciones S.A., we issued a warrant to purchase
223,000 shares of common stock at an exercise price of $0.91 per share. FMR,
KVH Industries and MetroRED are not obligated to purchase any of our products
as a condition to FMR exercising the warrant. We believe that, given our early
stage of development at the time of the negotiation and issuance of the
warrant, the issuance of this warrant was a cost of establishing a relationship
with this potential customer. The value of $3.0 million ascribed to the warrant
was estimated using the Black-Scholes option valuation model with the following
assumptions:

    .  no expected dividend yield;

    .  risk free interest rate of 5.50%;

    .  expected volatility of 70%; and

    .  contractual term of seven years.

Given that there are no future performance obligations to exercise this
warrant, the warrant was expensed in the three months ended March 31, 2000.

   In a separate transaction in March 2000, as consideration for professional
services rendered, we issued a warrant to purchase 200,000 shares of common
stock to Fenwick & West LLP at an exercise price of $15.00 per share. The value
of $1.5 million ascribed to the warrant was estimated using the Black-Scholes
option valuation model using the following assumptions:

    .  no expected dividend yield;

    .  risk free interest rate of 5.50%;

    .  expected volatility of 70%; and

    .  contractual term of four years.

The warrant was expensed in the three months ended March 31, 2000.

 Interest income (expense), net

   Interest income (expense), net increased by $687,000, or 380%, from $181,000
for the three months ended March 31, 1999 to $868,000 for the three months
ended March 31, 2000. The increase was primarily due to the interest income
earned on proceeds from sales of preferred stock.

 Comparison of Year Ended December 31, 1998 and 1999

   Although we were incorporated on October 20, 1997, we did not effectively
commence operations until January 1998 when we completed our first preferred
stock financing. As a result, we believe that our results of operations prior
to 1998 are not meaningful.

 Revenue

   In connection with our spinout from Optivision, we inherited several
government research and development contracts. Prior to 1999, all of our
revenue resulted from these contracts. In 1999, we recognized approximately
$1.1 million in revenue from the licensing of our operating system software.
The remaining revenue of approximately $1.9 million was derived from government
research and development contracts and other consulting services. The
government research and development contracts were completed in June 1999. We
will not continue these activities, and they will not contribute to our revenue
in the future.

                                       29
<PAGE>

   As of December 31, 1999, our ONLINE9000 product was undergoing field trial
testing and was not generally available for sale; accordingly, no product
revenue was recorded.

 Cost of revenue

   Cost of revenue for 1998 and 1999 consisted primarily of salaries,
contracted services and materials required in the fulfillment of obligations
under government contracts.

 Research and development

   Research and development expenses were $4.0 million in 1998 and increased by
534% to $25.4 million in 1999, representing 41.9% of total operating expenses
in 1998 and 51.6% of total operating expenses in 1999. The increase in research
and development expenses was primarily related to the increase in the number of
personnel and an increase in engineering and prototype expenses related to the
design, development and testing of our ONLINE9000 product. At December 31,
1998, we had a total of approximately 43 research and development employees
and, at December 31, 1999, we had approximately 110 research and development
employees.

 Sales and marketing

   Sales and marketing expenses were $649,000 in 1998 and increased by 602% to
$4.6 million in 1999, representing 6.8% of total operating expenses in 1998 and
9.3% of total operating expenses in 1999. The increase in sales and marketing
expenses was primarily related to the increase in the number of personnel,
including the establishment of a direct sales force and customer service and
support team, as well as costs associated with tradeshows, promotional
activities and public relations. At December 31, 1998, we had a total of three
sales and marketing employees, and at December 31, 1999, we had approximately
21 sales and marketing employees.

 General and administrative

   General and administrative expenses were $1.6 million in 1998 and increased
by 198.9% to $4.8 million in 1999, representing 16.6% of total operating
expenses in 1998 and 9.7% of total operating expenses in 1999. The increase in
general and administrative expenses was primarily related to the increase in
personnel and increased legal, information systems, facilities and consulting
services associated with our growing business activities. At December 31, 1998,
we had a total of approximately 12 general and administrative employees, and at
December 31, 1999, we had approximately 30 general and administrative
employees.

 Amortization of deferred stock compensation

   In connection with grants of stock options and sales of stock to employees
with exercise or sales prices subsequently determined to be below the deemed
fair value of our common stock on the dates of grant or sale, we recorded
amortization of deferred stock compensation of $3.3 million in 1998 and
$11.4 million in 1999, an increase of 245.0%. As of December 31, 1999, our
unamortized deferred stock compensation was $35.5 million, of which
approximately $21.6 million will be amortized in 2000. In addition, we have
granted additional stock options in 2000 that will result in a substantial
increase in deferred stock compensation and amortization expense.

 Common stock warrant expense

   In December 1999, in connection with the signing of a purchase and license
agreement with COLT Telecom plc, we issued a warrant to purchase 500,000 shares
of common stock at an exercise price of $0.91 per share. COLT is not obligated
to purchase any of our products as a condition to exercising the warrant. We
believe that, given our early stage of development at the time

                                       30
<PAGE>

of the negotiation and issuance of the warrant, the issuance of this warrant
was a cost of establishing a relationship with this potential customer. The
value of $2.9 million ascribed to the warrant was estimated using the Black-
Scholes option valuation model with the following assumptions:

    .  no expected dividend yield;

    .  risk free interest rate of 5.50%;

    .  expected volatility of 70%; and

    .  contractual term of six years.

Given that there are no future performance obligations to exercise this
warrant, the warrant was expensed in the year ended December 31, 1999.

 Interest income (expense), net

   Interest income (expense), net, includes interest income from our cash
investments net of interest expense related to our lease financing obligations
and amortization of warrants issued in conjunction with our equipment lease and
credit facilities. We had interest income, net, of $183,000 in 1998 and
$623,000 in 1999, an increase of 241.0%. The increase was primarily due to the
interest income earned on proceeds from preferred stock issuances.

 Income taxes

   Income taxes for 1998 and 1999 consisted of minimum state taxes. As of
December 31, 1999, we had net operating loss carryforwards for federal and
California income tax purposes of $34.0 million and research credit
carryforwards of approximately $1.1 million. The federal carryforwards will
expire at various dates from 2012 through 2019. Utilization of the net
operating losses may be subject to a substantial annual limitation due to the
ownership change limitations contained in Section 382 of the Internal Revenue
Code. There is sufficient uncertainty regarding the reliability of the deferred
tax assets that we have recorded a full valuation allowance.

Liquidity and Capital Resources

   From inception through December 31, 1999, we financed our operations
primarily through private sales of convertible preferred stock, for net
proceeds of approximately $122.9 million, and common stock, for net proceeds of
approximately $329,000. We raised an additional $2.0 million from the sale of
preferred stock and $783,000 from the sale of common stock during the three
months ended March 31, 2000.

   The following table describes the preferred stock issuances that have funded
our operations from inception through March 31, 2000:

<TABLE>
<CAPTION>
      Date                           Consideration           Price per            Preferred
     Closed         Series            ($ million)              Share             Shares Sold
     ------         ------           -------------           ---------           -----------
   <S>              <C>              <C>                     <C>                 <C>
   12/97-3/98          B                 $ 4.3                 $0.24             18,128,843
   12/97-3/98          C                 $ 2.0                 $0.75              2,733,332
         4/98          D                 $ 4.4                 $0.88              4,969,148
   12/98-5/99          E                 $23.8                 $0.91             26,284,024
         9/99          F                 $15.0                 $1.82              8,249,468
   12/99-3/00          G                 $76.9                 $6.32             12,163,418
</TABLE>

   In 1997, we were spun-out from Optivision, Inc. In connection with this
spin-out, Optivision, Inc. retained, among other equity issuances, 4,000,000
shares of Series A preferred stock. All Series A

                                       31
<PAGE>

preferred stock subsequently converted into Series B preferred stock. In 1998,
Optivision sold two-thirds of its Series B holdings, and we repurchased the
remaining one-third of its Series B holdings. Optivision does not currently own
any of our shares.

   In connection with an equipment lease financing arrangement, we issued
warrants to purchase a total of 68,062 shares of Series B convertible preferred
stock at $0.88 per share. The warrants expire on the earlier of February 10,
2009, or five years from this offering. No warrants had been exercised as of
March 31, 2000.

   We used $29.6 million in cash in operating activities in 1999, an increase
of $23.8 million, or 409%, from the $5.8 million used in 1998. The increase was
primarily due to the increase in our net loss of $37.7 million, an increase in
inventory of $9.6 million and other working capital of $9.5 million, offset by
increased amortization of deferred stock compensation and common stock warrants
of $11.0 million, and depreciation and amortization of $2.5 million. We used
$21.0 million in cash in operating activities in the three months ended March
31, 2000, an increase of $18.4 million, or 703%, from the $2.6 million used in
the three months ended March 31, 1999. The increase was primarily due to the
increase in our net loss of $29.4 million, an increase of inventory of $11.1
million and a decrease of other working capital of $3.3 million, offset by
increased amortization of deferred stock compensation of $12.3 million,
amortization of common stock warrants of $4.5 million and depreciation and
amortization of $1.7 million.

   We used $6.6 million in cash in investing activities in 1999, an increase of
$5.6 million, or 550%, from the $1.0 million used in 1998. The increase was
primarily related to the purchase of property and equipment and the net cash
portion of our acquisition of Object-Mart of $1.7 million. We used $11.4
million in cash in investing activities in the three months ended March 31,
2000, an increase of $11.0 million from the $385,000 used in the three months
ended March 31, 1999. The increase was due to the purchase of property and
equipment, primarily engineering and test equipment.

   We generated $97.1 million in cash from financing activities in 1999, an
increase of $71.2 million, or 275%, from the $25.9 million generated in 1998,
primarily from the private sales of convertible preferred stock and issuance of
common stock. We have used leases to partially finance capital purchases of
property and equipment. We had $119,000 in capital lease obligations
outstanding at December 31, 1998 and $533,000 at December 31, 1999. We
generated $2.7 million in cash from investing activities in the three months
ended March 31, 2000, a decrease of $4.6 million from the $7.3 million
generated in the three months ended March 31, 1999. The decrease was primarily
due to a reduction in proceeds from preferred stock financings of $5.3 million,
offset by an increase in proceeds from the issuance of common stock of
$744,000.

   At December 31, 1999, cash and cash equivalents totaled $80.0 million, an
increase of $60.9 million, or 319%, from the balance of $19.1 million at
December 31, 1998. The increase was due to the receipt of $97.1 million,
primarily from the sale of convertible preferred stock, offset by $29.6 million
of cash used in operating activities and $6.6 million of cash used in investing
activities. At March 31, 2000, cash and cash equivalents totaled $50.3 million,
a decrease of $29.7 million from December 31, 1999. The decrease was due to the
use of $21.0 million in operating activities and $11.4 million in investing
activities offset by the receipt of $2.7 million, primarily from the sale of
preferred stock.

   As of December 31, 1999, we had entered into a line of credit that allowed
us to borrow up to $2,000,000 and $1,000,000, respectively. We had not borrowed
any amounts under these agreements as of December 31, 1999, and they both
expired in February 2000, unutilized.

   We have a lease financing facility for $1.5 million, of which $467,000 had
been drawn as of December 31, 1999. This facility with a 7.51% annual interest
charge expires in December 2002.

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<PAGE>

   Our capital requirements depend on numerous factors, including:

  . the resources we devote to developing, manufacturing, marketing, selling
    and supporting our products;

  . market acceptance of our products and the timing and extent of sales of
    our products; and

  . the timing and extent of capital expenditures required to establish our
    international operations.

   We expect to devote substantial capital resources to continue our research
and development activities, to expand our sales, marketing and customer service
and support organizations, to support our information systems requirements and
for other general corporate activities. We believe that our current cash
balances will be sufficient to fund our operations for at least the next 12
months. In addition, we believe that the net proceeds from this offering will
provide us with substantial working capital. However, we may require additional
financing within that time frame. If needed, additional financing may not be
available on terms acceptable to us or at all.

   In March 2000, we agreed to sell $4.0 million of common stock to Internet
Initiative Japan Inc. at the initial public offering price, representing
160,000 shares of common stock, in a private placement that will close
concurrent with this offering. Internet Initiative Japan will be granted the
right to include these shares in future registered offerings that we may file.
We also entered into a trial system purchase agreement with Internet Initiative
Japan for our ONLINE9000 product in April 2000.

   In April 2000, we agreed to sell $10.0 million of common stock to CCT
Telecom Holdings Limited at the initial public offering price, representing
400,000 shares of common stock, in a private placement that will close
concurrent with this offering. CCT Telecom will be granted the right to include
these shares in future registered offerings that we may file.

   In May 2000, we sold 1,333,333 shares of Series H preferred stock to Sun
Microsystems, Inc. at a price of $15.00 per share for an aggregate purchase
price of $20.0 million in a private placement. These preferred shares will
convert into 969,697 shares of common stock upon the completion of this
offering. The number of common shares to be issued on conversion is computed
using a 17.5% discount off of the initial public offering price. In the period
of conversion, this beneficial conversion feature will increase the net loss
attributable to common stockholders by approximately $4,242,000 and increase
the basic and diluted net loss per share.

Effect of Year 2000

   The year 2000 computer problem refers to the potential for system and
processing failures of date-related data as a result of computer controlled
systems using two digits rather than four to define the applicable year. For
example, software programs that have time-sensitive components may recognize a
date represented as "00" as the year 1900 rather than the year 2000. In
addition, programs may fail to recognize February 29, 2000, as a leap year date
as a result of an exception to the calculation of leap years that will occur in
the year 2000 and otherwise occurs only once every 400 years. This problem
could result in miscalculations, data corruption, system failures or
disruptions of operations.

   As of March 31, 2000, we had not experienced any significant disruptions in
our business related to year 2000 issues, nor do we expect to experience any
year 2000 related disruption in the operation of our systems.

   We are not aware of any of the companies to which we have shipped our
ONLINE9000 product experiencing any year 2000 related problems with our product
or their ability to deploy our product. In addition, we have not received
notice from any of our contract manufacturers or our other suppliers that they
have experienced any year 2000 problems with the parts supplied by them or that
would

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<PAGE>

affect their ability to supply products and services to us. Although most year
2000 problems should have become evident on or shortly after January 1, 2000,
additional year 2000 related problems may become evident. We will continue to
monitor our mission critical equipment and computer applications and those of
our suppliers and vendors throughout the year, in an effort to ensure that any
late year 2000 matters that may arise are promptly addressed.

Quantitative and Qualitative Disclosures About Market Risk

 Interest Rate Sensitivity

   We do not currently use derivative financial instruments for speculative
trading or hedging purposes. In addition we maintain our cash equivalents in
money market funds. Accordingly, we are not a party to financial instruments or
contracts, and do not have investments, that expose us to material interest
rate risk.

 Exchange Rate Sensitivity

   Currently, all of our sales and expenses are denominated in United States
Dollars. Therefore, we have not engaged in any foreign exchange hedging
activities to date. We do expect to conduct transactions in foreign currencies
in the future, so we may engage in foreign exchange hedging activities at that
time.

Recent 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". The new standard establishes accounting and reporting
standards for derivative instruments, including derivative instruments embedded
in other contracts, and for hedging activities. Statement of Financial
Accounting Standards 133 will be effective for our fiscal year ending December
31, 2001. We do not expect Statement of Financial Accounting Standards 133 to
have a material effect on our financial position or results of operations.

   In December 1999, the Securities and Exchange Commission issued Staff
Accounting Bulletin No. 101, which summarizes views of the Commission staff in
applying generally accepted accounting principles to revenue recognition in
financial statements. We believe that our current revenue recognition
principles comply with this bulletin.

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<PAGE>

                                    BUSINESS

Overview

   We develop, market and sell optical communications networking equipment
specifically designed to address the bandwidth and service limitations of
metropolitan area and regional networks, which we refer to as metro networks.
Communication service providers can cost-effectively deploy our products to
relieve the growing traffic bottleneck in these networks and offer new revenue-
generating data services. By installing our equipment, service providers can
rapidly build high-capacity metro networks that are flexible, scalable, and
able to support multiple services on a single platform.

Industry Background

 Increased Demand for Network Capacity

   Rapid growth in the popularity of the Internet and in the number of
Internet-based applications and services has fueled dramatic growth in the
volume of data traffic. According to Ryan, Hankin & Kent, Internet traffic will
increase from 350,000 terabytes, or trillions of bytes, per month at the end of
1999 to over 15,000,000 terabytes per month during 2003. This growth will
increase demand for capacity in the public communications network. This
capacity is usually measured in bits of data per second and is commonly known
as bandwidth. Bandwidth improvements make it possible for communication service
providers to offer new revenue-generating services such as remote data storage
and local area network extensions to their customers. As these new bandwidth-
intensive services are introduced and gain commercial acceptance, additional
network bandwidth and optical infrastructure will be required.

 Evolution of Optical Networking

   The existing communications network infrastructure was designed and built to
carry voice calls, based on standards such as the synchronous optical
networking standard. The rapid adoption of the Internet and the resulting
growth of data traffic are driving service providers toward deploying equipment
and networks designed, built and optimized for both data and voice traffic.
Given the scope of existing and projected Internet traffic, many communication
service providers are designing and installing networks based on optical
technology, which generally enables greater capacity and higher transmission
speed.

   Optical networking technology transmits data using pulses of light over
optical fiber, rather than pulses of electricity over copper wires. Advances in
optical technology allow transmission of multiple signals on a single strand of
optical fiber, each signal using a different wavelength of light. Technology
currently enables transmission of up to 160 different wavelengths on a single
fiber. This means that today a service provider using appropriate technology
can multiply the transmission capacity of its existing fibers 160 times.

   The current communications network infrastructure can be divided into four
segments--long-haul, metro core, metro access and enterprise networks. To
satisfy the technical, pricing and performance needs of service providers, we
believe that optical networking equipment must be specifically designed for
each of these segments.

   Long-haul networks. Long-haul networks connect the communications networks
of metropolitan areas around the world. These networks move large amounts of
data and voice traffic point-to-point over long distances. The focus of
companies designing equipment for this segment has been to provide as much
bandwidth as possible between any two points.

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<PAGE>

   Metro core networks. Metro core networks connect long-haul networks to metro
access networks over distances of a few miles in dense urban business corridors
or a few hundred miles in regional urban and suburban settings. These networks
aggregate metro access traffic and distribute it throughout the metropolitan
area and to and from long-haul networks. They face a heterogeneous networking
environment due to the number and variety of access providers that they serve
and the service types that they support.

   Metro access networks. Metro access networks connect end-users such as
enterprises and individuals to the metro core network. These networks are the
points at which traffic enters and exits the public communications network.
Metro access networks are complex because they must manage a wide variety of
services to meet the needs of end-users.

   Enterprise networks. Enterprise networks provide data and voice connections
among end-users within a building or group of buildings. These networks also
connect end-users to the public communications network infrastructure.

 Metro Network Bottleneck

   Optical technologies were first deployed in long-haul networks, where the
capacity constraints of the existing infrastructure were first encountered and
the simple architecture and homogeneous traffic made it technically feasible
and cost effective. Over time, enterprise networks have also benefited from the
deployment of new optical technology, including high-speed data communication
services such as gigabit ethernet and fibre channel.

   To date, optical solutions specifically designed to address the challenges
faced by metro core and access networks have not been available, which has
impeded the growth of bandwidth in metro networks.

   We believe that the transmission speed in the metro portion of the network
over the last several years has grown at a small fraction of the growth rate
seen in long-haul and enterprise networks. This has created a bottleneck
impeding service delivery.

 Challenges Facing Metro Core and Metro Access Network Service Providers

   Communication service providers seeking to develop and introduce next
generation services to their customers face significant challenges that are not
adequately addressed by current metro solutions, including:

   Enabling emerging service offerings and supporting existing
services. Communication service providers that serve regions and metropolitan
areas endeavor to offer business enterprises and consumers a variety of high-
speed connectivity services, such as:

  . access to the public switched telephony network, for voice and fax
    service;

  . Internet access for data services, including high-speed digital
    subscriber lines;

  . access to offsite data facilities, for data backup and storage; and

  . extension of the local area network to multiple locations within the
    metro area.

   In addition, service providers seek to offer next generation services to
create new revenue- generating opportunities. Most current solutions require
dedicated equipment and interfaces that are unique for each particular service
and transmission rate. Given the dominance of data traffic, next generation
equipment must be specifically designed for efficient transmission of data
traffic and delivery of emerging services, while accommodating voice traffic.
This equipment must also support an unpredictable and changing mix of service
offerings on a single platform.

                                       36
<PAGE>

   Manageability and Flexibility. As the introduction of new services increases
network complexity, service providers will require software and systems that
allow for easy and effective end-to-end management of data and voice services.
Since the metro network must constantly adapt to changes in the number and
location of users, the equipment must be flexible enough to accommodate
bandwidth deployment, where needed and when needed.

   Low cost and scalability. Service providers need solutions that are cost-
effective to deploy initially and easily scale to handle rapid growth. To
expand their existing networks, they must add new equipment to their previously
deployed infrastructure, which is costly, utilizes the limited space in metro
service providers' facilities inefficiently and increases the complexity of
network management. Service providers seek new systems that can replace
existing systems at a price point that will allow revenue from new services to
provide a return on deployment costs and can be deployed in a pay-as-you-grow
fashion.

   Reliability. Because the applications carried over metro networks are
critical to enterprises and users, rapid restoration of service is a key
requirement for all metro networks. Communication service providers require
equipment that meets existing reliability standards, while improving
reliability for higher bandwidth applications.

   To date, attempts to solve the problems faced by metro networks have focused
on increasing bandwidth. These attempts include using equipment based on the
synchronous optical network standard, deploying additional fiber, and adapting
long-haul solutions such as existing point-to-point implementations of current
optical technology to the metro network. When applied to metro networks, these
efforts are costly, time-consuming, difficult to scale or difficult to manage.
For example, the synchronous optical network standard architecture was
originally designed for voice traffic, is not easily scalable and therefore
hinders introduction of today's emerging high-speed data services. In addition,
synchronous optical networking requires that at least 50% of network capacity
be reserved for carrying duplicated traffic to provide restoration capability
in the event of a network outage. Similarly, deploying additional fiber in
metropolitan areas is expensive and time-consuming because it requires permits,
rights-of-way and physical installation of fiber. Current optical technology
was originally designed for long-haul applications in a synchronous optical
network environment. As designed for long-haul networks, current optical
technology is inefficient and expensive to deploy in metro networks. To be
applied in the metro network, many currently available optical networking
implementations require additional electrical equipment to add and drop traffic
and to provide rapid service restoration.

   In addition, today's networks are not entirely optical. Transmitted signals
in these networks undergo multiple optical-to-electrical-to-optical
conversions. These conversions are costly because they require deployment of
additional equipment and are inefficient because they are limited by the
bandwidth constraints and inflexibility of existing electronics embedded in
today's networks.

The ONI Systems Solution

   We develop, market and sell optical networking equipment that enables
communication service providers to offer new revenue-generating services while
fully supporting existing voice and data services. Our data-optimized, scalable
solution increases available bandwidth in metropolitan areas and delivers end-
to-end manageability and rapid restoration for all services. Our family of
products consists of the ONLINE9000 for metro core networks, the ONLINE7000,
which we expect to be available by June 2000 for metro access networks, our
OPTX network operating system and our OLMP inter-network communications
protocol.

                                       37
<PAGE>

   Our product offerings provide the following benefits to communication
service providers:

   Multi-service capability. Our equipment and interfaces support multiple
service offerings. As a result, a service provider using our solution can
provide a changing mix of services as customer needs evolve, without deploying
dedicated equipment for each service. Our solution is compatible with the
synchronous optical network standard, providing service providers with an
evolutionary upgrade path. Our products are also designed for efficient
transmission of high-speed data traffic and delivery of emerging services,
while supporting voice services. For example, multiple services, including
services based on the synchronous optical network standard, gigabit ethernet
and fibre channel, are supported on the same platform by our equipment and
interfaces.

   Manageability and flexibility. As network complexity increases, service
providers require software and systems that allow easy end-to-end service
management. Our products combine a network operating system, management
software and inter-network communications protocols to enable:

  . real-time control of bandwidth allocation as needed, where needed and
    when needed;

  . real-time surveillance of network performance;

  . interoperability with third-party management software and data routing
    and switching equipment; and

  . point-and-click activation of services.

   Cost effectiveness and scalability. Our solution is designed to scale
efficiently as demand for bandwidth and new services increases. Our products
lower service providers' equipment acquisition and network operation costs by
reducing the amount of equipment required, and by allowing them to install
their equipment incrementally in a pay-as-you-grow fashion without sacrificing
their existing infrastructure investments. In addition, our solution requires
less space in service providers' facilities because our products are designed
to handle current networking standards and can readily be upgraded to handle
emerging services without the deployment of additional equipment.

   Rapid and efficient service restoration. Survivability is a key factor for
all metro networking services. Our products provide for restoration of service
within the synchronous optical network standard of 50 milliseconds, without
the need to dedicate bandwidth for restoration by carrying duplicated traffic,
as is required by typical synchronous optical network standard-based
equipment. Since our products do not require carrying duplicated traffic,
communications service providers can utilize their existing fiber more
efficiently by placing more traffic on each fiber route.

The ONI Systems Strategy

   The key elements of our strategy are to:

 Leverage our optical approach to achieve early design wins in metro core and
 metro access networks.

   We believe that the challenges facing metro service providers are most
efficiently addressed through our optical approach. Since service providers
are in the early stages of deployment of optical metro networks, we expect
that service providers will select vendors with the strongest technology
positions. We plan to take advantage of our position as a technology leader to
achieve design wins with these service providers, which will position us to
grow rapidly as these new networks are deployed.

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<PAGE>

 Enable our customers to offer new revenue-generating services to their end-
 users.

   We intend to continue to develop and provide solutions that will enable our
customers to deliver emerging revenue-generating services to end-users. We
believe the demand for new services is a key driver of our customers' growth
and we intend to ensure that our hardware and software architectures continue
to offer the performance and flexibility to allow rapid introduction of new
services. We intend to work closely with our customers to help them identify
new services that they can deliver using our products.

 Extend technology leadership.

   Our optical architecture and dynamic network operating system are key
elements of our technology leadership. We believe that these elements can be
incorporated into future product offerings for other segments of the
communications network. We intend to extend our technology leadership and to
develop new product offerings and future product enhancements through continued
investment in research and development.

 Leverage optical manufacturing expertise.

   Our ability to manufacture complex optical networking products is a key to
our success. We believe we have developed a world-class manufacturing
capability through a combination of our own manufacturing systems and third-
party manufacturing relationships. We believe that this combination gives us a
competitive advantage and will enable us to reduce our manufacturing costs,
while providing us with manufacturing flexibility to meet changing demand.

 Expand direct sales, service and support organizations to address global
 opportunities.

   We intend to expand our direct sales capability into global markets. We
believe that sales efforts on a customer-by-customer basis are most effective
because deployment of communications equipment involves careful technical
evaluation, multiple levels of decision making and significant investments by
our customers. While we may consider indirect sales channels where appropriate,
we intend to continue to focus our sales and distribution efforts on direct
sales. We have developed a direct sales organization in North America and
Europe and are expanding that sales force as well as developing direct sales
forces for Asia and Latin America. In addition to our existing teams in the
United States, we are also establishing service and support teams
internationally to support our major customers.

 Establish strategic alliances and pursue acquisitions to extend our leadership
 in optical networking.

   We intend to establish strategic alliances with complementary technology
suppliers in order to leverage our technology leadership in providing optical
networking solutions. We believe that alliances with companies that provide
complementary products to enable new services will bring our customers greater
value. In addition, we intend to pursue acquisitions that will enable us to
broaden our product, service and technology portfolios.

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<PAGE>

Optical Architecture

   Rather than processing network signals by converting incoming optical
signals to electrical form, processing them and converting them back to optical
form, our product architecture supports the following functions in an optical
manner:

  . combination and separation of
    multiple optical channels;

  . per channel and grouped
    wavelength routing;

  . real-time flexible adding or
    dropping of optical channels;

  . switching and routing around
    optical fiber failure or
    equipment failure;

  . signal amplification; and

  . supervisory channels for
    performance monitoring.

[BEGIN DESCRIPTION OF GRAPHIC--DIAGRAM DEPICTING ONI SYSTEMS' ALL-OPTICAL
ARCHITECTURE]

Centered in the diagram are a stack of six long rectangles representing
functional layers within our ONLINE9000 or ONLINE7000 products. Superimposed
over the rectangles is a flow chart representing movement of the optical
signals through the functional layers.

From top to bottom:

The words "Interface to Client Equipment" appear above the top-most (or first)
rectangle in the stack. The portion of the flowchart shown in this rectangle
are squares representing interfaces to the client equipment.

The portion of the flowchart shown in each of the second and fourth rectangle
are trapezoids representing combination and separation of optical signals on
the signal. The words "Multiplexing, Demultiplexing" appear to the left of
these rectangles.

The portion of the flowchart shown in each of the third and fifth rectangle is
a smaller rectangle representing optical switching of the signal. The word
"Switching" appears in the flowchart rectangle. The word "Switching" appears to
the right of the third and fifth rectangle in the stack.

The portion of the flowchart shown in the sixth rectangle are triangles
representing amplification of signals to and from the network. The word
"Amplifiers" appears in the center of this rectangle. The words "To Fiber
Network" appear below the bottom-most rectangle of the stack.

[END DESCRIPTION OF GRAPHIC--DIAGRAM DEPICTING ONI SYSTEMS' ALL-OPTICAL
ARCHITECTURE]

   Our OPTX operating system software architecture integrates network design
tools, operations management software and end-to-end service management and
activation systems, as shown in the diagram below. This integrated environment
enables automated transfer of data through open interfaces to craft and
management terminals as well as local administrative networks for the
communications service provider.

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<PAGE>

   Built with software infrastructure based on the XML standard, OPTX also
provides standards-based CORBA interfaces to the service provider's operations
support systems and network-wide service applications, including service
ordering and activation, and inventory systems. Our OPTX architecture enables
information exchange with data switching and routing equipment through our OLMP
inter-network communications protocol. OPTX helps provide comprehensive and
integrated network design, operations and service management capabilities by
managing networks built with our ONLINE9000 product.

       [BEGIN DESCRIPTION OF GRAPHIC--DIAGRAM DEPICTING ONI SYSTEMS' OPTX
                                 ARCHITECTURE]

  The center of the diagram is a large square. The name "OPTX" appears in the
     upper right corner of the square. Below this word appear three upright
     rectangles. The words "Network Design Application" appear in the left
 rectangle. The words "Network Configuration Application" appear in the center
    rectangle. The words "Network Operation Application" appear in the right
rectangle. Below these rectangles occupying the bottom quarter of the square is
             a rectangle with the words "Embedded Software" inside.

 Above the main square is an ellipse with the words "Operations Support Systems
   (Network Management, Service Management)" inside. To the left of the main
   square is an upright ellipse with the words "Graphical User Interface and
 Users" inside. To the right of the main square is an upright ellipse with the
  words "Client Equipment" inside. Each of these ellipses is connected to the
 main square by a two-way arrow. The name OLMP appears directly above the two-
        way arrow connecting the main square and the right-hand ellipse.

 [END DESCRIPTION OF GRAPHIC--DIAGRAM DEPICTING ONI SYSTEMS' OPTX ARCHITECTURE]

Products

 ONLINE9000

   The ONLINE9000 is designed for metropolitan area and regional networks and
delivers cost-effective, scalable capacity for the metro communications service
provider. It provides restoration faster than the synchronous optical network
standard of 50 milliseconds and supports dynamic optical add-drop capabilities
on all deployed channels. To help service providers deploy large networks, the
ONLINE9000 includes optical amplifiers to extend transmission distances. The
ONLINE9000 can be used in conventional ring network topologies and can
transport a variety of traffic patterns, including mesh. We intend in the
future to develop products that can be used in ring-mesh and mesh network
topologies. In its base configuration, the ONLINE9000 includes the following
key features:

  . 33 protected or 66 unprotected channels;

  . line-based optical rerouting of channels in the event of optical fiber
    failure;

  . a universal optical architecture supporting multiple bit rates and
    protocols, including OC-3, OC-12, OC-48, OC-192, gigabit ethernet and
    fibre channel;

  . client interfaces currently supporting OC-3, OC-12, OC-48, gigabit
    ethernet, fibre channel and, expected in the third calendar quarter of
    2000, OC-192; and

  . integrated optical amplifiers with sophisticated power management
    capabilities.

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<PAGE>

 ONLINE7000

   We have recently introduced the ONLINE7000, which we anticipate will be
available by June 2000. The ONLINE7000 is designed to provide metro service
providers with a cost-effective solution for metro access applications.
Integrated monitoring and surveillance capabilities will ensure managed
operation from the operator's perspective across metro core and metro access
networks. The ONLINE7000 shares the same management and operating system as the
ONLINE9000 and can be deployed as an extension of the ONLINE9000.

   The ONLINE7000 includes many functions of synchronous optical network and
data multiplexers. This capability will allow the carrier to deploy multiple
synchronous optical network or native-format data services using a single
wavelength. The ONLINE7000 is scalable up to 33 protected or 66 unprotected
channels. In its base configuration, key features of the ONLINE7000 will
include:

  . optional optical and electrical rerouting of channels in the event of
    optical fiber failure, expected to be released in June 2000;

  . a 199 shelf form factor suitable for metro access networks, expected to
    be released in July 2000; and

  . the ability to add or drop multiple synchronous optical network or data
    channels to or from a single wavelength, expected to be released in
    October 2000.

 OPTX Operating System

   Our OPTX optical network operating system provides a unified environment for
metro core and metro access service providers to manage diverse networking
resources and hardware and software systems. Analogous to the operating systems
of personal computers, OPTX manages all resources in the transmission network,
including transmission systems, connections, protection resources and
terminals, and allocates resources to various users and applications, based on
user preferences. OPTX brings the ability to manage, arbitrate and dynamically
control network-wide resources to metro network service providers. Multiple
application programmer interfaces within OPTX link to other management systems
and applications. The OPTX architecture and infrastructure makes extensive use
of the XML standard to enable interaction with other network management
equipment without developing dedicated interfaces. The key features of the OPTX
operating system include:

  .  OPTXNET, an integrated optical network design tool that provides
     automatic optical link analysis, link optimization and configuration for
     each node in the network;

  .  Network and service management interface and applications, including
     surveillance, service activation and ordering systems and network
     inventory reports; and

  .  CORBA-based interfaces to the service provider's network operations
     support systems.

 OLMP (Optical Link Management Protocol)

   Our OLMP inter-network communications protocol enables data routing and
switching equipment to exchange information with our optical transmission
equipment in metro networks. This information exchange allows data switching
and routing equipment to request and receive required resources from optical
transmission equipment. Our OLMP protocol is designed to enable data equipment
to directly request the metro network to set up and drop optical channels when
required in real time. For example, OLMP enables fibre channel equipment to
exchange route-length, latency and bandwidth availability for end-to-end
management of storage area networks. We believe that our OLMP is the first
network-level internetworking protocol to link the data and switching equipment
to optical transmission equipment.

Customers

   Our target customers include communication service providers such as
regional Bell operating companies, competitive local exchange carriers, long-
distance carriers with local operations, cable

                                       42
<PAGE>

operators, Internet service providers, and foreign telephone companies. We have
entered into agreements under which the following communication service and
equipment providers may, but are not obligated to, purchase our products: COLT
Telecom plc, KVH Industries Inc., Lucent Technologies, Inc., Marietta Fibernet,
MetroRED Telecommunicaciones S.A., StorageNetworks, Inc. and Williams
Communications, Inc. We have also entered into a limited trial system purchase
agreement with Internet Initiative Japan Inc.

   In addition, we have shipped the ONLINE9000 to Marietta Fibernet,
StorageNetworks and Williams Communications in the United States, COLT Telecom
in the United Kingdom, Internet Initiative Japan in Japan and Lucent
Technologies for deployment in China.

Sales and Marketing

   In North America and Europe, we have developed a direct sales force and in
some limited circumstances may join with other communications equipment
providers to bid on major proposals. Our direct sales force consists of sales
teams made up of an account manager, systems engineers and technical support
and training personnel. Each team is assigned responsibility for specific
geographic territories and specific customers within each territory. We are
continuing to expand our existing direct sales force and are developing a
direct sales force to sell to potential customers outside North America and
Europe.

   In some international regions where it is difficult or expensive to maintain
a direct sales force, we may rely on resellers for distribution of our
products. For example, in April 2000, we entered into an OEM relationship with
Lucent Technologies that expires on December 31, 2001. Under the terms of our
agreement, Lucent Technologies has the exclusive right to sell some of our
products in China for a period of 12 months.

   Our marketing programs are designed to inform existing and potential
customers about the capabilities and benefits of our products. We also use our
marketing programs to support the sale and distribution of our products through
our direct sales force. Our marketing efforts include public relations,
participation in industry trade shows and conferences.

Customer Service and Support

   Our customer service and support organization provides maintenance services
and training in the use of our products after they are installed at a
customer's site. Installation services are provided by ONI Systems or third-
party providers of engineering, furnishing and installation services. Our
customer service centers, located at our facilities in San Jose, California and
London, England, include highly-qualified teams of systems engineers and
technical personnel who work closely with our direct sales force and provide
24-hour-a-day, 7-day-a-week support for our customers.

Research and Development

   We believe that to be successful we must continue to enhance our existing
products and develop new products that maintain technological competitiveness.
We have assembled a team of approximately 165 highly skilled optical hardware
and software engineers, manufacturing and test engineers and system and network
architects. Research and development expenses were $4.0 million for the year
ended December 31, 1998 and $25.4 million for the year ended December 31, 1999.
We will continue to make substantial investments in research and development.

   Our product development process is driven by market demand and a close
collaboration between our product marketing, sales and product development
organizations. Our product development process begins with a detailed set of
specifications prepared by our product management organization.

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<PAGE>

We also incorporate feedback from our customers in the product development
process. In addition, we participate in industry and standards organizations
where appropriate and incorporate information from these contacts throughout
the product development process.

Manufacturing and Supply

   We conduct supply chain management, production engineering, documentation
control and quality assurance at our assembly facility in San Jose, California.
We outsource most of the manufacturing of optical modules used in our products,
and we complete the final assembly of these optical modules at our facilities.
The majority of our electronic manufacturing and assembly is outsourced.
Currently, we use a number of manufacturing vendors for electronic assemblies
while E-TEK Dynamics, Inc. performs the majority of our outsourced optical
assembly.

   This approach to manufacturing allows us to:

  . reduce the capital equipment expenditures that would be required for a
    turnkey manufacturing operation;

  . reduce our facilities square footage requirements by limiting the amount
    of space dedicated to manufacturing and operations;

  . conserve working capital by limiting the amount of inventory we must
    stock; and

  . respond to market demand flexibly.

   We currently purchase many of our electrical and optical components through
purchase orders. In order to help us maintain a supply of components, and
specifically optical components, we intend to use long term supply agreements
with vendors. For example, in March 2000, we entered into an agreement with E-
TEK Dynamics, under which E-TEK Dynamics will supply optical components and
module integration services to us through at least December 31, 2001. We are
required to purchase at least half of our requirements of the optical
components covered by this agreement from E-TEK Dynamics.

Competition

   Competition in the metro communications networking equipment market is
intense. Our existing and potential competitors are numerous and include
established companies such as Alcatel, CIENA, Cisco Systems, Juniper Networks,
Lucent Technologies, Nortel Networks, Siemens, Sycamore Networks and Tellabs. A
number of private companies have recently announced plans for new products to
address the same problems that our products address and have attracted
substantial amounts of venture capital funding. Many of these companies,
particularly the large public companies, have substantially greater financial,
marketing and development resources than we have, which puts us at a
competitive disadvantage. Many of them have existing relationships with
communication service providers, which will make it more difficult for us to
sell our products to those customers. Some competitors may seek to use
intellectual property rights to limit our ability to compete. For example,
Nortel Networks claims that we infringe some of its patents.

   We believe that the principal methods of competition in the market for metro
communications networking equipment are product performance, reliability and
expandability, and the ability of a product to deliver cost-effective results.
We believe that to be competitive in the communications networking equipment
market we must deliver products that:

  . provide extremely high network reliability;

  . provide high performance capabilities;

                                       44
<PAGE>

  . scale easily and efficiently with minimum disruption to the network;

  . interoperate with existing network designs and equipment vendors;

  . reduce the complexity of the network by decreasing the need for multiple
    layers of equipment; and

  . provide a cost-effective solution for service providers.

   While our first product has only been generally available since January
2000, we believe that positive factors pertaining to our competitive position
include our technology, the expertise of our research and development
personnel, our manufacturing expertise and our intellectual property rights. We
believe that negative factors pertaining to our competitive position include
our relative newness in the market and the fact that some of our competitors
have large financial resources available to promote sales of their products and
to develop products more directly competitive with ours. If we are unable to
compete successfully against our current and future competitors, we could
experience price reductions, reduced gross margins and loss of market share,
any one of which could materially harm our business, operating results and
financial condition.

Intellectual Property

   Our success and ability to compete depends on our ability to develop
technological expertise internally. We rely on a combination of patent,
copyright, trademark and trade secret laws and restrictions on disclosure to
protect our intellectual property rights. We have been issued six patents in
the United States. However, only two of these patents are currently significant
to our products. In addition, we currently have 16 patent applications pending
in the United States and internationally. These patents relate to optical
architecture, hardware, software and management systems. Issued patents may not
protect our intellectual property or may be challenged by third parties. In
addition, others may independently develop similar or competing technology or
design around our patents.

   We enter into confidentiality or license agreements with our employees,
consultants and corporate partners and control access to and distribution of
our software, documentation and other proprietary information. Despite our
efforts to protect our proprietary rights, unauthorized parties may attempt to
copy or otherwise obtain and use our products or technology. These precautions
may not prevent misappropriation or infringement of our intellectual property.

   ONI Systems(TM), ONI(TM), our logo, ONLINE9000(TM), ONLINE7000(TM),
OPTX(TM), OPTXNET(TM), OLMP(TM), Dynamic Transport System(TM) and DTS(TM) are
trademarks of ONI Systems. All other names or trademarks appearing in this
prospectus are the property of their holders.

Employees

   As of March 31, 2000, we had a total of 326 employees:

  . 147 in research and development;

  . 41 in sales and marketing;

  . 18 in customer service and support;

  . 68 in manufacturing; and

  . 52 in finance and administration.

   Our future success will depend in part on our ability to attract and retain
highly qualified technical and management personnel. Competition for such
talent is intense. None of our employees are represented by any collective
bargaining unit, and we believe that our relations with our employees are good.

                                       45
<PAGE>

Facilities

   Our headquarters are currently located in a leased facility in San Jose,
California, consisting of approximately 53,000 square feet under a lease that
expires in 2002. We also lease a facility of approximately 58,000 square feet
in San Jose, California, under a lease that expires in 2006, and a facility of
approximately 1,500 square feet in Raleigh, North Carolina, under a short-term
lease. We expect to require additional space within the next 12 months. We
entered into a lease for a new facility in May 2000. The lease will expire in
2011. The new facility is initially approximately 346,000 square feet, and will
expand to approximately 445,000 square feet in January 2003. We intend to move
our headquarters to this new facility in the first quarter of 2001.

Legal Proceedings

   In October 1999, Nortel Networks filed suit in the Superior Court for the
Province of Quebec, District of Montreal, Canada against us and several of our
employees who were former employees of Nortel Networks. The suit seeks an
injunction to prevent us from hiring additional Nortel Networks employees and
to prohibit the use of Nortel Networks' trade secrets by us. In October 1999
and November 1999, temporary orders were issued prohibiting the former Nortel
Networks employees from soliciting current Nortel Networks' employees and from
using specified Nortel Networks trade secrets. The temporary orders were
renewed on several occasions, by court order following agreement of the parties
to such renewal, and remain effective through September 5, 2000.

   In March 2000, Nortel Networks filed an additional suit against us in the
United States District Court for the Northern District of California. The suit
involves allegations that our products infringe five patents held by Nortel
Networks, and sets forth allegations of misappropriation of trade secrets,
unlawful business practices and common law unfair competition. Nortel Networks
seeks preliminary and permanent injunctions and damages against us in
connection with these claims.

   We are in the preliminary stages of investigating the claims asserted by
Nortel Networks. We believe that we have meritorious defenses against Nortel
Networks' allegations, and we intend to defend the Nortel Networks litigation
vigorously. Based on our investigation to date, we believe that our products do
not infringe the Nortel Networks patents and that we have not engaged in
misappropriation of trade secrets, unlawful business practices or common law
unfair competition.

   In April 2000, we filed a motion to dismiss Nortel Networks' claims for
misappropriation of trade secrets, unlawful business practices and common law
unfair competition from the California suit. We also filed an answer and
counterclaims asserting unfair business practices, tortious interference,
breach of contract and seeking declarations of invalidity, unenforceability and
non-infringement of the patents against Nortel Networks.

   In the event that an injunction is granted that prevents us from selling our
products, we would have to either negotiate a license with Nortel Networks or
engage in a redesign of our products. We may not be able to obtain a license
from Nortel Networks on commercially reasonable terms, or at all. A redesign of
our products would result in an interruption in sales that could extend for
some time. Accordingly, a permanent injunction would result in a substantial
reduction in our revenue and result in losses over an extended period of time.

   We expect to incur substantial legal and other expenses in connection with
the Nortel Networks litigation. In addition, we expect the Nortel Networks
litigation to continue to divert the efforts and attention of our management
and technical personnel. Patent litigation is highly complex and can extend for
a protracted period of time, which can substantially increase the cost of
litigation. Accordingly, the expenses and diversion of resources associated
with this litigation could seriously harm our business and financial condition
and could affect our ability to raise capital in the future. In the event of an
adverse ruling, we also could be required to pay damages to Nortel Networks,
and if this litigation is resolved by settlement, we might need to make
substantial payments to Nortel Networks, which could harm our business and
financial condition.

                                       46
<PAGE>

                                   MANAGEMENT

Executive Officers, Directors and Significant Employees

   Our executive officers, directors and significant employees, and their ages
and positions as of May 1, 2000, are as follows:

<TABLE>
<CAPTION>
      Name                     Age                   Position
      ----                     ---                   --------
<S>                            <C> <C>
Executive Officers
 and Directors:
Hugh C. Martin................  46 President, Chief Executive Officer and
                                    Chairman of the Board of Directors
Chris A. Davis................  49 Executive Vice President, Chief Financial
                                   and  Administrative Officer
Hon Wah Chin..................  45 Chief Technology Officer
William R. Cumpston...........  38 Senior Vice President, Engineering and
                                    Operations
Michael A. Dillon.............  41 Vice President, General Counsel and
                                   Secretary
Robert J. Jandro..............  44 Executive Vice President, Worldwide Sales
                                    and Marketing
Andrew W. Page................  34 Vice President, Corporate Development
Matthew W. Bross..............  39 Director
Kevin R. Compton..............  41 Director
Jonathan D. Feiber............  42 Director
James F. Jordan...............  60 Director
Gregory B. Maffei.............  39 Director
Significant Employees:
Kenneth H. Calhoun............  34 Vice President, Product Marketing
Martin Desroches..............  35 Vice President, Operations
William S. Jarvis.............  37 Vice President, Worldwide Sales
Rohit Sharma..................  31 Vice President, Optical Hardware Development
</TABLE>

   Hugh C. Martin has served as President and Chief Executive Officer of ONI
Systems, and a member of the board of directors, since January 1998. He was
appointed Chairman of the Board of Directors in February 2000. From July 1997
to January 1998, he served as Entrepreneur-in-Residence at Kleiner Perkins
Caufield & Byers, a venture capital firm. Mr. Martin served as President of The
3DO Company, an entertainment software company, from 1992 to June 1997. He is a
member of the board of directors of The 3DO Company. He holds a B.S. in
Electrical Engineering from Rutgers University.

   Chris A. Davis has served as Executive Vice President, Chief Financial and
Administrative Officer of ONI Systems since May 2000. Ms. Davis served as
Executive Vice President, Chief Financial and Administrative Officer of
Gulfstream Aerospace Corporation from 1993 until April 2000 and as Vice
President of General Dynamics from July 1999, when it acquired Gulfstream
Aerospace, until April 2000. She is a member of the boards of directors of
Compaq Computer Corporation, Cytec Industries, Inc. and Wolverine Tube, Inc.
She holds an M.S. in Finance and Statistics and a B.S. in Finance from the
University of Florida.

   Hon Wah Chin has served as Chief Technology Officer of ONI Systems since
June 1998. Mr. Chin served as Senior Systems Architect at Cisco Systems, Inc.,
a network equipment company, from 1994 to June 1998 and was a Cisco
Distinguished Engineer. He holds a S.B. in Electrical Engineering and Computer
Science from the Massachusetts Institute of Technology.

                                       47
<PAGE>

   William R. Cumpston has served as Senior Vice President, Engineering and
Operations of ONI Systems since June 1999 and served as Vice President,
Engineering of ONI Systems from September 1998 to June 1999. Prior to joining
us, Mr. Cumpston served in various management positions at DSC Communications
Corp., a telecommunications company, from 1995 to August 1998. He holds a B.S.
in Math Science from the University of North Carolina at Chapel Hill.

   Michael A. Dillon has served as Vice President and General Counsel of ONI
Systems since October 1999 and as Secretary since March 2000. From August 1995
to October 1999, Mr. Dillon served as Director and as Senior Director of Sun
Microsystems, Inc., a computer company, and from 1993 to August 1995, he served
as Senior Counsel for Sun Microsystems. He holds a J.D. from Santa Clara
University and a B.A. in Communications/Sociology from the University of
California, San Diego.

   Robert J. Jandro has served as Executive Vice President, Worldwide Sales and
Marketing of ONI Systems since March 2000. Mr. Jandro served as Group Vice
President of Oracle Corporation, a database software company, from May 1999 to
March 2000. From 1994 to May 1999, he served as Oracle's Vice President, North
America Communications and Vice President, United States Central Region, Latin
America and Canada. He holds an M.B.A. from the Kellogg Graduate School of
Management at Northwestern University and a B.S. in Business from the
University of Missouri, St. Louis.

   Andrew W. Page has served as Vice President, Corporate Development of ONI
Systems since February 2000. Mr. Page served as Managing Director and head of
the Global Communications Group of FleetBoston Robertson Stephens Inc., an
investment bank, from April 1997 to February 2000. He served as a Principal of
Volpe, Welty & Company from 1993 to March 1997. He holds an M.B.A. from Harvard
University Graduate School of Business and a B.A. in English Literature from
Princeton University.

   Matthew W. Bross has served as a director of ONI Systems since November
1999. Since May 1999, he has served as Senior Vice President and Chief
Technology Officer of Williams Communications, Inc., a communications service
provider. From March 1997 to May 1999, he served in various management
capacities for Williams Communications. From 1991 to March 1997, he served as
the founder and Chief Executive Officer of Critical Technologies, Inc., a
telecommunications infrastructure company, which was acquired by Williams
Communications.

   Kevin R. Compton has served as a director of ONI Systems since January 1998.
Mr. Compton has served as a general partner at Kleiner Perkins Caufield & Byers
since 1990. Mr. Compton serves on the boards of directors of 360networks Inc.,
Active Software, Inc., Citrix Systems, Inc., Corsair Communications, Inc.,
Rhythms NetConnections Inc. and VeriSign, Inc.

   Jonathan D. Feiber has served as a director of ONI Systems since January
1998. Mr. Feiber has served as a general partner at Mohr Davidow Ventures, a
venture capital investment firm, since 1991. From 1983 to 1991, he served in
various capacities at Sun Microsystems, most recently as Vice President of
Networking. He is a director of several privately-held companies. He holds a
B.A. in Computer Science and Mathematics from the University of Colorado.

   James F. Jordan has served as a director of ONI Systems since March 1998.
Mr. Jordan has privately managed his investment fund since 1994. He was one of
the founders of Ungermann-Bass Inc. and was President and Chief Executive
Officer of Kalpana, Inc. prior to the sale of the company to Cisco Systems in
1994. He holds a B.S. in Business and Marketing from the University of Utah.

                                       48
<PAGE>

   Gregory B. Maffei has served as a director of ONI Systems since February
2000. Mr. Maffei has served as Chief Executive Officer and as a member of the
board of directors of 360networks Inc., a communications service provider,
since December 1999. From 1993 to December 1999, Mr. Maffei served in various
capacities with Microsoft Corporation, a software company, most recently as
Senior Vice President, Finance and Administration, and Chief Financial Officer.
He serves on the board of directors of Avenue A, Inc., Expedia, Inc. and
Starbucks Corporation. He holds an M.B.A. from Harvard University Graduate
School of Business and a B.A from Dartmouth College.

   Kenneth H. Calhoun has served as Vice President, Product Marketing of ONI
Systems since February 1999 and served as Senior Director, Product Marketing of
ONI Systems from August 1998 to February 1999. He served as Senior Manager,
Account Marketing and Senior Manager, Product Marketing at Nortel Networks
Corporation, a telecommunications company, from March 1997 to August 1998. Mr.
Calhoun served as Senior Manager and Manager, Broadband Product Planning with
Fujitsu Network Communications, Inc. from September 1995 to March 1997. He
holds a Ph.D. in Electrical Engineering and a B.S. in Electrical Engineering
from the Georgia Institute of Technology.

   Martin Desroches has served as Vice President, Operations of ONI Systems
since October 1999. Mr. Desroches served as Senior Manager, High Speed Optics
Operations for Nortel Optoelectronics, an optical components company, from
September 1998 to October 1999. He served as Senior Manager and Manager, OC-192
Manufacturing Engineering for Nortel Networks from June 1994 to September 1998.
He holds a B.S. in Electrical Engineering from the University of Sherbrooke.

   William S. Jarvis has served as Vice President, Worldwide Sales of ONI
Systems since May 1999. Mr. Jarvis served as Sales Vice President for NEC
America, a telecommunications company, from October 1996 to May 1999 and
Director of Sales for NEC America from January 1995 to January 1996. He holds
an M.B.A. from Santa Clara University and a B.S. in Business Administration
from San Jose State University.

   Rohit Sharma founded ONI Systems in our spin-out from Optivision, Inc. and
has served as Vice President, Optical Hardware Development since January 1999.
He served as Chief Architect from April 1998 to January 1999. Prior to the
spin-out, he served as a member of Optivision's technical staff from October
1996 to April 1998. He holds a Ph.D. and a M.Sc. in Electrical Engineering from
the University of Alberta, Canada and a B.Sc. in Electronics and Communications
Engineering from R.E.C. Kurukshetra, India.

Board Composition

   Our board currently consists of six members. Each director is elected for a
period of one year at our annual meeting of stockholders and serves until the
next annual meeting or until his successor is duly elected and qualified.

   Our bylaws provide that, following this offering, our board of directors
will be divided into three classes as nearly equal in size as possible with
staggered three-year terms. The classification of our board of directors could
have the effect of making it more difficult for a third party to acquire, or
discouraging a third party from acquiring, control of ONI Systems.

Board Committees

   Our board of directors has two committees:

   Compensation Committee. The current members of our compensation committee
are Messrs. Compton and Feiber. The compensation committee reviews and makes
recommendations to our board concerning salaries and incentive compensation for
our officers. The compensation committee also administers our stock plans.

                                       49
<PAGE>

   Audit Committee. The current members of our audit committee are Messrs.
Jordan, Feiber and Maffei. Our audit committee reviews and monitors our
financial statements and accounting practices, makes recommendations to our
board regarding the selection of independent auditors and reviews the results
and scope of the audit and other services provided by our independent auditors.

   Members serve on these committees until their resignation or until otherwise
determined by our board.

Compensation Committee Interlocks and Insider Participation

   None of the members of the compensation committee has at any time since our
formation been an officer or employee of ours. None of our executive officers
currently serves or in the past has served as a member of the board of
directors or compensation committee of any entity that has one or more
executive officers serving on our board or compensation committee. Prior to the
creation of our compensation committee, all compensation decisions were made by
our full board.

Director Compensation

   Our directors do not receive cash compensation for their services as
directors but are reimbursed for their reasonable expenses in attending board
and board committee meetings. The following directors have been granted stock
awards or options to purchase our common shares. In March 1998 and November
1998, we granted stock awards to purchase 360,000 shares and 180,000 shares of
common stock to Mr. Jordan for $0.08 and $0.09 per share, respectively, which
he purchased in full. In November 1999, we granted an option to purchase
180,000 shares of common stock to Mr. Bross at an exercise price of $0.91 per
share. In December 1999, we granted an option to purchase 1,215,834 shares of
common stock to Mr. Martin at an exercise price of $1.25 per share in
connection with his services as President and Chief Executive Officer. In March
2000, we granted an option to purchase 120,000 shares of common stock to Mr.
Maffei at an exercise price of $3.20 per share.

   Members of the board who are not employees of ONI Systems, or any parent,
subsidiary or affiliate of ONI Systems, will be eligible to participate in the
2000 equity incentive plan. The option grants under the plan are automatic and
nondiscretionary, and the exercise price of the options is the fair market
value of the common stock on the date of grant.

   Each non-employee director who becomes a member of the board on or after the
effective date of the registration statement of which this prospectus forms a
part will be granted an option to purchase 80,000 shares of common stock. Also,
each non-employee director who became a member of the board prior to the
effective date of the registration statement of which this prospectus forms a
part and who did not receive an option grant will receive an option to purchase
80,000 shares. Immediately following each annual meeting of stockholders, each
eligible director will automatically be granted an additional option to
purchase 40,000 shares of common stock if the director has served continuously
as a member of the board since the date of the prior annual meeting. The board
of directors may make discretionary supplemental grants to an eligible director
who has served for less that one year from the date of that director's initial
grant. The options have ten-year terms. They will terminate three months
following the date the director ceases to be a director or a consultant or 12
months following termination due to death or disability. All options granted
under the 2000 equity incentive plan will become exercisable over a four year
period at a rate of 25% after one year and 2.083% per month thereafter so long
as he or she continues as a member of the board or as a consultant. In the
event of our dissolution or liquidation or a change in control transaction,
options granted to directors under the plan will become 100% vested and
exercisable in full.

                                       50
<PAGE>

Executive Compensation

   The following table presents compensation information for our fiscal year
ended December 31, 1999 paid to or accrued for our Chief Executive Officer and
each of our executive officers whose salary and bonus was more than $100,000.
The compensation table includes long-term awards granted in 1999. The
compensation table excludes other compensation in the form of perquisites and
other personal benefits that constituted less than 10% of the total annual
salary and bonus for the named executive officer in the fiscal year ended
December 31, 1999.

   The table includes compensation information for Terrence J. Schmid, our
former Chief Financial Officer and Vice President, Finance and Administration,
who resigned effective April 28, 2000.

   The table does not include compensation information for three executive
officers who commenced employment after December 31, 1999. These three officers
would have been among the five most highly compensated executive officers had
they been employees of ONI Systems in 1999. Chris A. Davis, our Executive Vice
President, Chief Financial and Administrative Officer, commenced employment
with ONI Systems on May 1, 2000. Ms. Davis' salary on an annualized basis for
2000 is $400,000, which does not include a $300,000 bonus received upon
commencement of employment. Robert J. Jandro, our Executive Vice President,
Worldwide Sales and Marketing, commenced employment with ONI Systems on March
1, 2000. Mr. Jandro's salary on an annualized basis for 2000 is $295,000, which
does not include a $200,000 bonus payable upon the satisfaction of established
performance goals. Andrew W. Page, our Vice President, Corporate Development,
commenced employment with ONI Systems on February 29, 2000. Mr. Page's salary
on an annualized basis for 2000 is $300,000, which does not include a $30,000
bonus received upon commencement of employment.

                      Summary Compensation Table for 1999

<TABLE>
<CAPTION>
                                                               Long-Term
                                                          Compensation Awards
                                                         ---------------------
                                             Annual
                                          Compensation   Restricted Securities
                                        ----------------   Stock    Underlying
     Name and Principal Positions        Salary   Bonus    Awards    Options
     ----------------------------       -------- ------- ---------- ----------
<S>                                     <C>      <C>     <C>        <C>
Hugh C. Martin......................... $270,001 $    --     --     1,215,834
 President and Chief Executive Officer

Terrence J. Schmid.....................  173,335      --     --       320,000
 Chief Financial Officer and Vice
  President, Finance and Administration
Hon Wah Chin...........................  182,820      --     --       200,000
 Chief Technology Officer

William R. Cumpston....................  191,666  85,000     --       800,000
 Senior Vice President, Engineering and
  Operations
</TABLE>

                                       51
<PAGE>

                             Option Grants in 1999

   The following table sets forth grants of stock options in 1999 to the
executive officers named in the summary compensation table above.

   All options granted generally vest over four years, either:

  . at the rate of 25% of the shares subject to the option on the first
    anniversary of the date of grant and 2.083% each month thereafter; or

  . at the rate 2.083% of the shares subject to the option each month.

   Options expire ten years from the date of grant. Options were granted at an
exercise price equal to the fair market value of our common stock, as
determined by the board as of the date of grant.

   Estimated values are computed by

  . multiplying the number of shares of common stock subject to a given
    option by the initial public offering price of $25.00 per share, and

  . subtracting from that result the aggregate option exercise price.

   Potential realizable values are computed by

  . multiplying the number of shares of common stock subject to a given
    option by the initial public offering price of $25.00 per share,

  . assuming that the aggregate stock value derived from that calculation
    compounds at the annual 5% or 10% rates shown in the table for the entire
    ten-year term of the option, and

  . subtracting from that result the aggregate option exercise price. The 5%
    and 10% assumed annual rates of stock price appreciation are mandated by
    the rules of the Securities and Exchange Commission and do not represent
    our estimate or projection of future common stock prices.

   The percentage of total options granted to employees in 1999 is based on
options to purchase a total of 19,269,998 shares of common stock of ONI Systems
granted to employees during 1999.

   Mr. Schmid resigned as our Chief Financial Officer and Vice President,
Finance and Administration effective April 28, 2000.

<TABLE>
<CAPTION>
                                                                                   Potential Realizable Value
                         Number of  Percentage of                                    at Assumed Annual Rates
                         Securities Total Options                                  of Stock Price Appreciation
                         Underlying  Granted to   Exercise                               for Option Term
                          Options     Employees     Price   Expiration  Estimated  ----------------------------
Name                      Granted      in 1999    Per Share    Date       Value         5%            10%
----                     ---------- ------------- --------- ---------- ----------- ------------- --------------
<S>                      <C>        <C>           <C>       <C>        <C>         <C>           <C>
Hugh C. Martin.......... 1,215,834      6.31%       $1.25    12/21/09  $28,876,058 $  47,991,844   $77,319,214

Terrence J. Schmid......   120,000      0.62         0.09      3/4/09    2,989,200     4,875,884     7,770,427
                           200,000      1.04         1.25    12/21/09    4,750,000     7,894,473    12,718,712

Hon Wah Chin............   100,000      0.52         0.09     7/15/09    2,491,000     4,063,237     6,475,356
                           100,000      0.52         1.25    12/21/09    2,375,000     3,947,237     6,359,356

William R. Cumpston.....   300,000      1.56         0.09      3/4/09    7,473,000    12,189,710    19,426,068
                           200,000      1.04         0.91     9/15/09    4,818,000     7,962,473    12,786,712
                           300,000      1.56         1.25    12/21/09    7,125,000    11,841,710    19,078,068
</TABLE>

                                       52
<PAGE>

                             Option Grants in 2000

   The following table sets forth grants of stock options to new executive
officers since December 31, 1999:

<TABLE>
<CAPTION>
                                                                    Potential Realizable Value
                         Number of                                    at Assumed Annual Rates
                         Securities Exercise                        of Stock Price Appreciation
                         Underlying  Price                                for Option Term
                          Options     Per    Expiration  Estimated  ---------------------------
Name                      Granted    Share      Date       Value         5%            10%
----                     ---------- -------- ---------- ----------- ------------- --------------
<S>                      <C>        <C>      <C>        <C>         <C>           <C>
Chris A. Davis.......... 1,000,000   $ 4.00    5/3/10   $21,000,000 $  36,722,366 $  60,843,562
Robert J. Jandro........   900,000     3.20    3/1/10    19,620,000    33,770,129    55,479,205
Andrew W. Page..........   300,000     3.20    3/1/10     6,540,000    11,256,710    18,493,068
                            50,000    10.00    5/3/10       750,000     1,536,118     2,742,178
</TABLE>

     Aggregated Option Exercises in the Fiscal Year Ended December 31, 1999

   The following table presents the number of shares acquired and the value
realized upon exercise of stock options during the fiscal year ended December
31, 1999.

   The value realized equals the fair market value of the purchased shares on
the option exercise date, less the exercise price paid for those shares. None
of the individuals named in the table below held any options at December 31,
1999. The shares acquired upon exercise of those options will be subject to
repurchase by ONI Systems, at the original exercise price paid per share, if
the optionee ceases service with ONI Systems before those shares have vested.

   Mr. Schmid resigned as our Chief Financial Officer and Vice President,
Finance and Administration effective April 28, 2000.

   In March 2000, Mr. Jandro acquired 900,000 shares of common stock on the
exercise of an option and Mr. Page acquired 300,000 shares of common stock on
the exercise of an option. Neither Mr. Jandro or Mr. Page had any value
realized on their respective option grants. To date, Ms. Davis has not
exercised any options.

<TABLE>
<CAPTION>
                                                             Number of
                                                              Shares
                                                            Acquired on  Value
     Name                                                    Exercise   Realized
     ----                                                   ----------- --------
     <S>                                                    <C>         <C>
     Hugh C. Martin........................................  1,215,834  $     --

     Terrence J. Schmid....................................    320,000    98,400
     Hon Wah Chin..........................................    200,000    82,000

     William R. Cumpston...................................  1,300,000   656,000
</TABLE>

Employee Benefit Plans

   1997 Stock Option Plan. As of March 31, 2000, options to purchase 318,088
shares of common stock were outstanding under our 1997 stock option plan. The
options outstanding as of March 31, 2000 had a weighted average exercise price
of $0.03 per share. The board of directors terminated this plan in April 1998,
and no options have been granted under it since that time. Termination did not
affect any outstanding options, all of which will remain outstanding and
subject to the terms of our 1997 stock option plan and stock option agreement
until exercise or until they terminate or expire by their terms. Options
granted under our 1997 stock option plan are subject to terms substantially
similar to those described below with respect to options granted under our 2000
equity incentive plan.

                                       53
<PAGE>

   1998 Equity Incentive Plan. As of March 31, 2000, options to purchase
18,039,257 shares of common stock were outstanding under our 1998 equity
incentive plan and 1,029,653 shares of common stock remained available for
issuance upon the exercise of options that may be granted in the future. The
options outstanding as of March 31, 2000 had a weighted average exercise price
of $0.63 per share. Our 1998 equity incentive plan will terminate upon this
offering, at which time our 2000 equity incentive plan will become effective.
As a result, no options will be granted under our 1998 equity incentive plan
after this offering. However, termination will not affect any outstanding
options under our 1998 equity incentive plan, all of which will remain
outstanding and subject to the terms of our 1998 equity incentive plan and
stock option agreement until exercise or until they terminate or expire by
their terms. Options granted under our 1998 equity incentive plan are subject
to terms substantially similar to those described below with respect to options
granted under our 2000 equity incentive plan.

   1999 Equity Incentive Plan. As of March 31, 2000, options to purchase
986,000 shares of common stock were outstanding under our 1999 equity incentive
plan and 348,166 shares of common stock remained available for issuance upon
the exercise of options that may be granted in the future. The options
outstanding as of March 31, 2000 had a weighted average exercise price of $0.96
per share. Our 1999 equity incentive plan will terminate upon this offering, at
which time our 2000 equity incentive plan will become effective. As a result,
no options will be granted under our 1999 equity incentive plan after this
offering. However, termination will not affect any outstanding options under
our 1999 equity incentive plan, all of which will remain outstanding and
subject to the terms of our 1999 equity incentive plan and stock option
agreement until exercise or until they terminate or expire by their terms.
Options granted under our 1999 equity incentive plan are subject to terms
substantially similar to those described below with respect to options granted
under our 2000 equity incentive plan.

   2000 Equity Incentive Plan. Our 2000 equity incentive plan will become
effective on the date of this prospectus and will serve as the successor to our
1998 equity incentive plan and our 1999 equity incentive plan. We have reserved
7,000,000 shares of common stock to be issued under this plan. In addition,
shares under our 1997 stock option plan, 1998 equity incentive plan and 1999
equity incentive plan not issued or subject to outstanding grants on the date
of this prospectus and any shares issued under these plans that are forfeited
or repurchased by us or that are issuable upon exercise of options that become
unexercisable for any reason without having been exercised in full will be
available for grant and issuance under our 2000 equity incentive plan. Shares
will again be available for grant and issuance under our 2000 equity incentive
plan that:

  . are subject to issuance upon exercise of an option granted under our 2000
    equity incentive plan that cease to be subject to the option for any
    reason other than exercise of the option;

  . have been issued upon the exercise of an option granted under our 2000
    equity incentive plan that are subsequently forfeited or repurchased by
    us at the original purchase price;

  . are subject to an award granted under a restricted stock purchase
    agreement under our 2000 equity incentive plan that are subsequently
    forfeited or repurchased by us at the original issue price; or

  . are subject to a stock bonus granted under our 2000 equity incentive plan
    that terminates without shares being issued.

   On each January 1, the aggregate number of shares reserved for issuance
under our 2000 equity incentive plan will increase automatically by a number of
shares equal to 5% of our outstanding shares on December 31 of the preceding
year. Our board of directors or compensation committee may reduce the amount of
the increase in any particular year.

                                       54
<PAGE>

   Our 2000 equity incentive plan will terminate after ten years from the date
our board of directors approved the plan, unless it is terminated earlier by
our board of directors. The plan authorizes the award of options, restricted
stock awards and stock bonuses. No person is eligible to receive more than
1,000,000 shares in any calendar year under the plan other than a new employee
of ONI Systems, who will be eligible to receive no more than 2,000,000 shares
in the calendar year in which the employee commences employment.

   Our 2000 equity incentive plan will be administered by our compensation
committee, all of the members of which are non-employee directors under
applicable federal securities laws and outside directors as defined under
applicable federal tax laws. The compensation committee will have the authority
to construe and interpret the plan, grant awards and make all other
determinations necessary or advisable for the administration of the plan. Also,
our non-employee directors are entitled to receive automatic annual grants of
options to purchase shares of our common stock, as described under
"Management--Director Compensation".

   Our 2000 equity incentive plan will provide for the grant of both incentive
stock options that qualify under Section 422 of the Internal Revenue Code and
nonqualified stock options. Incentive stock options may be granted only to
employees of ONI Systems or of a parent or subsidiary of ONI Systems. All other
awards other than incentive stock options may be granted to employees,
officers, directors and consultants of ONI Systems or any parent or subsidiary
of ONI Systems, provided the consultants render bona fide services not in
connection with the offer and sale of securities in a capital-raising
transaction. The exercise price of incentive stock options must be at least
equal to the fair market value of our common stock on the date of grant. The
exercise price of incentive stock options granted to 10% stockholders must be
at least equal to 110% of that value. The exercise price of nonqualified stock
options must be at least equal to 85% of the fair market value of our common
stock on the date of grant.

   Options may be exercised only as they vest or may be immediately exercisable
with the shares issued subject to our right of repurchase that lapses as the
shares vest. In general, options will vest over a four-year period. The maximum
term of options granted under our 2000 equity incentive plan is ten years.

   Awards granted under our 2000 equity incentive plan may not be transferred
in any manner other than by will or by the laws of descent and distribution.
They may be exercised during the lifetime of the optionee only by the optionee.
The compensation committee may determine otherwise and provide for these
provisions in the award agreement, but only with respect to awards that are not
incentive stock options. Options granted under our 2000 equity incentive plan
generally may be exercised for a period of three months after the termination
of the optionee's service to ONI Systems or a parent or subsidiary of ONI
Systems. Options will generally terminate immediately upon termination of
employment for cause.

   The purchase price for restricted stock will be determined by our
compensation committee. Stock bonuses may be issued for past services or may be
awarded upon the completion of stated services or performance goals.

   2000 Employee Stock Purchase Plan. Our 2000 employee stock purchase plan
will become effective on the first day on which price quotations are available
for our common stock on the Nasdaq National Market. We have initially reserved
1,000,000 shares of common stock under this plan. On each January 1, the
aggregate number of shares reserved for issuance under our 2000 employee stock
purchase plan will increase automatically by a number of shares equal to 1% of
our outstanding shares on December 31 of the preceding year. Our board of
directors or compensation committee may reduce the amount of the increase in
any particular year. The aggregate number of shares reserved for issuance under
our 2000 employee stock purchase plan may not exceed 10,000,000 shares.

                                       55
<PAGE>

   Our 2000 employee stock purchase plan will be administered by our
compensation committee. Our compensation committee will have the authority to
construe and interpret the plan, and its decisions will be final and binding.

   Employees generally will be eligible to participate in our 2000 employee
stock purchase plan if they are employed before the beginning of the applicable
offering period and they are customarily employed by us, or our parent or any
subsidiaries that we designate, for more than 20 hours per week and more than
five months in a calendar year and are not, and would not become as a result of
being granted an option under the plan, 5% stockholders of us or our designated
parent or subsidiaries. Participation in our 2000 employee stock purchase plan
will end automatically upon termination of employment for any reason.

   Under our 2000 employee stock purchase plan, eligible employees will be
permitted to acquire shares of our common stock through payroll deductions.
Eligible employees may select a rate of payroll deduction between 1% and 15% of
their compensation and are subject to maximum purchase limitations.

   Except for the first offering period, each offering period under our 2000
employee stock purchase plan will be for two years and consist of four six-
month purchase periods. Offering periods and purchase periods will begin on
February 1 and August 1 of each year. The first offering period is expected to
begin on the first business day on which price quotations for common stock are
available on the Nasdaq National Market. However, because the first day on
which price quotations for our common stock will be available on the Nasdaq
National Market may not be February 1 or August 1, the length of the first
offering period may be more or less than two years, and the length of the first
purchase period may be more or less than six months.

   Our 2000 employee stock purchase plan provides that, in the event of our
proposed dissolution or liquidation, each offering period that commenced prior
to the closing of the proposed event will continue for the duration of the
offering period, provided that the compensation committee may fix a different
date for termination of the plan. The purchase price for common stock purchased
under the plan will be 85% of the lesser of the fair market value of our common
stock on the first day of the applicable offering period or the last day of the
applicable purchase period. The compensation committee will have the power to
change the offering dates, purchase dates and duration of offering periods
without stockholder approval, if the change is announced prior to the beginning
of the affected date or offering period.

   Our 2000 employee stock purchase plan is intended to qualify as an employee
stock purchase plan under Section 423 of the Internal Revenue Code. The plan
will terminate ten years from the date the plan was adopted by our board of
directors, unless it is terminated earlier under the terms of the plan. The
board of directors will have the authority to amend, terminate or extend the
term of the plan, except that no action may adversely affect any outstanding
options previously granted under the plan.

   Except for the automatic annual increase of shares described above,
stockholder approval will be required to increase the number of shares that may
be issued or to change the terms of eligibility under our 2000 employee stock
purchase plan. The board of directors will be able to make amendments to the
plan as it determines to be advisable if the financial accounting treatment for
the plan is different from the financial accounting treatment in effect on the
date the plan was adopted by the board of directors.

   401(k) Plan. We sponsor a defined contribution plan intended to qualify
under Section 401 of the Internal Revenue Code, or a 401(k) plan. Employees who
are at least 21 years old are generally eligible to participate. Participants
may make pre-tax contributions to the plan of up to 15% of their

                                       56
<PAGE>

eligible earnings, subject to a statutorily prescribed annual limit. Each
participant is fully vested in his or her contributions and the investment
earnings. There are no matching contributions under the plan. Contributions by
the participants to the plan, and the income earned on these contributions, are
generally not taxable to the participants until withdrawn. Participant
contributions are held in trust as required by law. Individual participants may
direct the trustee to invest their accounts in authorized investment
alternatives.

Employment-Related Agreements

   Hugh C. Martin. In January 1998, we entered into an at-will employment
agreement with Mr. Martin. Mr. Martin initially received a base salary of
$200,000 per year. Mr. Martin's current salary is $280,000 per year. He is also
eligible to receive an annual performance bonus of up to 25% of his salary,
which was guaranteed at $50,000 in 1998. In addition, we granted Mr. Martin a
stock award to purchase 8.5% of our total capital stock, subject to vesting
requirements. We also granted Mr. Martin a stock award to purchase 1.5% of our
total capital stock, which vested according to attainment of 1998 and 1999
milestones. In the event of a change in control of ONI Systems, 50% of the
then-unvested shares subject to Mr. Martin's stock award will become fully
vested.

   Terrence J. Schmid. In February 1998, we entered into an at-will employment
agreement with Mr. Schmid. Mr. Schmid resigned as our Chief Financial Officer
and Vice President, Finance and Administration effective April 28, 2000. Mr.
Schmid initially received a base salary of $140,000 per year. He was eligible
to receive an annual performance bonus of up to 15% of his base salary, which
was guaranteed at $20,000 in 1998. In connection with this agreement, Mr.
Schmid purchased 533,332 shares of common stock, subject to vesting
requirements.

   In March 2000, we entered into a separation agreement with Mr. Schmid in
connection with his resignation. Under the terms of this agreement, we agreed
to make a severance payment of $90,000 which was equal to six months of Mr.
Schmid's final salary. We also agreed to waive our repurchase rights with
respect to up to 106,662 shares of common stock.

   Chris A. Davis. In April 2000, we entered into an at-will employment
agreement with Ms. Davis. Ms. Davis' initial and current salary is $400,000 per
year. She received a signing bonus of $300,000. We also agreed to allow Ms.
Davis to choose any one of these three alternatives:

  .  an option to purchase 1,100,000 shares of common stock at an exercise
     price per share equal to the fair market value of common stock on the
     date of grant;

  .  an option to purchase 1,000,000 shares of common stock at an exercise
     price per share of $4.00; or

  .  an option to purchase 1,000,000 shares of common stock at an exercise
     price per share equal to the fair market value of common stock on the
     date of grant together with loan forgiveness in an amount up to
     $2,125,000 per year for four years if Ms. Davis chooses to exercise this
     option immediately with a promissory note.

She chose the second alternative. Her option is subject to vesting. Ms. Davis
will be permitted to pay for the exercise of these options with a promissory
note. In the event of a change of control of ONI Systems and an involuntary or
constructive termination without cause of Ms. Davis' employment with us or our
successor, 50% of the then-unvested shares subject to Ms. Davis' stock option
will become fully vested.

   We have also agreed to loan, or guaranty a loan, of up to $3.0 million for
the purchase of a principal residence by Ms. Davis. The loan will be secured by
the residence and have a term of one year at an interest rate equal to the
lowest legal rate. The loan must be repaid within 90 days of the termination of
her employment.

                                       57
<PAGE>

   If we terminate Ms. Davis' employment without cause, she will be entitled to
receive six months of her then-current salary, benefits and vesting of options.
She will receive at least six months vesting if her employment is terminated
within the first year of her employment.

   Hon Wah Chin. In June 1998, we entered into an at-will employment agreement
with Mr. Chin. Mr. Chin initially received a base salary of $160,000 per year.
Mr. Chin's current salary is $200,000 per year. He is also eligible to receive
an annual performance bonus, which was guaranteed at $40,000 in 1998. In
addition, we granted Mr. Chin a stock award to purchase 674,000 shares of
common stock, subject to vesting requirements. In the event of a change in
control of ONI Systems, 50% of the then-unvested shares subject to Mr. Chin's
stock award and 50% of any other then unvested securities granted to Mr. Chin
by us will become fully vested.

   If we terminate Mr. Chin's employment without cause, he will be entitled to
receive six months of his then-current salary, benefits and vesting of options.

   William R. Cumpston. In August 1998, we entered into an at-will employment
agreement with Mr. Cumpston. Mr. Cumpston initially received a base salary of
$175,000 per year. Mr. Cumpston's current salary is $225,000 per year. He also
received a signing bonus of $45,000 and is eligible to receive an annual
performance bonus of at least $40,000. In addition, we granted Mr. Cumpston an
option to purchase 500,000 shares of common stock, subject to vesting
requirements.

   Michael A. Dillon. In October 1999, we entered into an at-will employment
agreement with Mr. Dillon. Mr. Dillon's initial and current salary is $200,000
per year. In addition, Mr. Dillon received a signing bonus of $50,000 and we
granted Mr. Dillon an option to purchase 300,000 shares of our common stock,
subject to vesting requirements. We also granted Mr. Dillon an option to
purchase an additional 20,000 shares of common stock, which is not subject to
any vesting requirements. In the event of a change in control of ONI Systems,
25% of the then-unvested shares subject to Mr. Dillon's stock option and 25% of
the then-unvested shares of any other securities granted to Mr. Dillon by us
will become fully vested.

   If we terminate Mr. Dillon's employment without cause during his first 12
months of employment, he will be entitled to receive six months of his then-
current salary, benefits and vesting of options.

   Robert J. Jandro. In February 2000, we entered into an at-will employment
agreement with Mr. Jandro. Mr. Jandro's initial and current salary is $295,000
per year. He is also eligible to receive an incentive bonus of up to $200,000.
We also granted Mr. Jandro an option to purchase 900,000 shares of common
stock, subject to vesting requirements. In the event of a change in control of
ONI Systems, 25% of the then-unvested shares subject to Mr. Jandro's stock
option and 25% of the then-unvested shares of any other securities granted to
Mr. Jandro by us will become fully vested.

   If we terminate Mr. Jandro's employment without cause during his first 12
months of employment, he will be entitled to receive six months of his base
salary.

   Andrew W. Page. In February 2000, we entered into an at-will employment
agreement with Mr. Page. Mr. Page's initial and current salary is $300,000 per
year. He also received a signing bonus of $30,000, and we granted him an option
to purchase 300,000 shares of common stock, subject to vesting requirements. In
the event of a change in control of ONI Systems, 50% of the then-unvested
shares subject to Mr. Page's stock option and 50% of the then-unvested shares
of any other securities granted to Mr. Page by us will become fully vested.

Indemnification of Directors and Executive Officers and Limitation of Liability

   Our certificate of incorporation and bylaws provide that a director shall
not be personally liable for monetary damages resulting from breach of his
fiduciary duty as a director, except for liability:

  . for any breach of the director's duty of loyalty to us or our
    stockholders;

                                       58
<PAGE>

  . for acts or omissions not in good faith or that involve intentional
    misconduct or a knowing violation of law;

  . under section 174 of the Delaware General Corporation Law regarding
    unlawful dividends and stock purchases; or

  . for any transaction from which the director derived an improper personal
    benefit.

Our bylaws provide that:

  . we are required to indemnify our directors and officers to the fullest
    extent permitted by the Delaware General Corporation Law;

  . we may indemnify our employees and agents as set forth in the Delaware
    General Corporation Law, subject to very limited exceptions;

  . we are required to advance expenses, as incurred, to our directors and
    executive officers in connection with a legal proceeding;

  . we may advance expenses, as incurred, to our employees and agents in
    connection with a legal proceeding; and

  . the rights conferred in the bylaws are not exclusive.

   In addition to the indemnification required in our certificate of
incorporation and bylaws, before the completion of this offering, we entered
into indemnity agreements with each of our current directors and executive
officers. These agreements provide for the indemnification of our officers and
directors for all expenses and liabilities incurred in connection with any
action or proceeding brought against them by reason of the fact that they are
or were our agents. We also intend to obtain directors' and officers' insurance
to cover our directors, officers and some of our employees for liabilities,
including liabilities under securities laws. We believe that these
indemnification provisions and agreements and this insurance are necessary to
attract and retain qualified directors and officers.

   The limitation of liability and indemnification provisions in our
certificate of incorporation and bylaws may discourage stockholders from
bringing a lawsuit against directors for breach of their fiduciary duty. They
may also reduce the likelihood of derivative litigation against directors and
officers, even though an action, if successful, might benefit us and other
stockholders. Furthermore, a stockholder's investment may be adversely affected
to the extent we pay the costs of settlement and damage awards against
directors and officers as required by these indemnification provisions. At
present, there is no pending litigation or proceeding involving any of our
directors, officers or employees regarding which indemnification by us is
sought, nor are we aware of any threatened litigation that may result in claims
for indemnification.

                                       59
<PAGE>

                           RELATED PARTY TRANSACTIONS

   Other than compensation agreements and other arrangements, which are
described as required in "Management", and the transactions described below,
since we were formed, there has not been, nor is there currently proposed, any
transaction or series of similar transactions to which we were or will be a
party:

  . in which the amount involved exceeded or will exceed $60,000; and

  . in which any director, executive officer, holder of more than 5% of our
    common stock on an as-converted basis or any member of their immediate
    family had or will have a direct or indirect material interest.

Optivision Spin-Out

   In October 1997, Optical Networks, Incorporated, our California predecessor,
was formed as a subsidiary of Optivision, Inc. In exchange for assets related
to the optical development business and related liabilities, Optivision
received 11,565,752 shares of our common stock and 8,000,000 shares of our
Series A preferred stock. In addition to the shares of capital stock delivered
to Optivision, we executed and delivered a $90,000 promissory note in favor of
Optivision that was subsequently cancelled by Optivision upon payment.

   In December 1997, we were spun out of Optivision and Optivision distributed
some of its holdings of our common stock and preferred stock to Optivision
shareholders. Holders of Optivision common stock and Series A preferred stock
received one share of our common stock for every share of Optivision common
stock or Series A preferred stock held, for an aggregate of 11,565,752 shares.
Holders of Optivision Series B preferred stock received one share of our Series
A preferred stock for every share of Optivision Series B preferred stock held,
for an aggregate of 4,000,000 shares. Optivision also retained 4,000,000 shares
of our Series A preferred stock. In January 1998, all of the shares of our
Series A preferred stock were converted into Series B preferred stock on a one-
for-one basis.

   In connection with the spin-out, we have reserved, and are obligated to
issue for no additional consideration, shares of our common stock upon the
exercise of the warrants to purchase capital stock of Optivision. In October
1997, ADC Telecommunications, Inc., a holder of Optivision Series B preferred
stock, entered into an agreement with Optivision that granted ADC registration,
information and other rights related to the Series A preferred stock
distributed to ADC as part of the spin-out. These rights were amended upon
conversion of its Series A preferred stock to Series B preferred stock.

   In January 1998, as a condition to the closing of our Series B and C
financings, we entered into agreements with Optivision granting us certain
additional assets, related liabilities and a license to technology and
assigning technology to us. In July 1998, we completed an agreement with
Optivision, under which it transferred contracts between the United States
government and Optivision to us.

   In January 1998, Optivision sold 2,666,667 shares of our Series B preferred
stock to Kleiner Perkins Caufield & Byers and its affiliates and Mohr, Davidow
Ventures and its affiliates, for an aggregate purchase price of $2.0 million.
In March 1998, we repurchased the remaining shares of our stock owned by
Optivision, consisting of 1,333,333 shares of our Series B preferred stock, for
an aggregate purchase price of $1.0 million. Optivision does not currently own
any shares of ONI Systems.

                                       60
<PAGE>

Preferred Stock Financings

   Since our inception, we have issued shares of preferred stock in private
placement transactions involving related parties as follows:

  . from December 1997 to March 1998, we sold 18,128,843 shares of Series B
    preferred stock for approximately $0.24 per share, issued 8,000,000
    shares of Series B preferred stock upon conversion of all outstanding
    shares of Series A preferred stock and repurchased 1,333,333 shares of
    Series B preferred stock;

  . from December 1997 to March 1998, we sold 2,733,332 shares of Series C
    preferred stock for approximately $0.75 per share;

  . from December 1998 to May 1999, we sold 26,284,024 shares of Series E
    preferred stock for approximately $0.91 per share;

  . in September 1999, we sold 8,249,468 shares of Series F preferred stock
    for approximately $1.82 per share; and

  . from December 1999 to March 2000, we sold 12,163,418 shares of Series G
    preferred stock for approximately $6.32 per share.

   Purchasers of our preferred stock include, among others, the following
executive officers, directors and holders of more than 5% of our outstanding
stock or entities affiliated with them. The following table presents the number
of shares and price per share for each of these purchasers. The number of total
shares on an as-converted basis reflects a one-to-one conversion to common
stock ratio for each share of Series B, Series C, Series E, Series F and Series
G preferred stock. Mr. Compton, a director of ONI Systems, is also a general
partner of Kleiner Perkins Caufield & Byers. Mr. Compton disclaims beneficial
ownership of shares held by Kleiner Perkins and affiliates except to the extent
of his interest in Kleiner Perkins and affiliates. Mr. Feiber, a director of
ONI Systems, is also a general partner of Mohr, Davidow Ventures. Mr. Feiber
disclaims beneficial ownership of shares held by Mohr, Davidow Ventures and
affiliates except to the extent of his interest in Mohr, Davidow Ventures and
affiliates. The shares held by Williams Communications, Inc. include 142,460
shares of Series G preferred stock held by Mr. Bross. Mr. Bross is a director
of ONI Systems and serves as Senior Vice President and Chief Technology Officer
of Williams Communications. Mr. Bross disclaims beneficial ownership of shares
held by Williams Communications and Williams Communications disclaims benefical
ownership of the shares held by Mr. Bross.

<TABLE>
<CAPTION>
                                                                               Total
                          Series B  Series C  Series E  Series F  Series G  Common Stock
       Purchaser          Preferred Preferred Preferred Preferred Preferred  Equivalent
       ---------          --------- --------- --------- --------- --------- ------------
<S>                       <C>       <C>       <C>       <C>       <C>       <C>
Kleiner Perkins Caufield
 & Byers and affiliates
 (Kevin R. Compton).....  9,824,680   666,666 1,917,808 1,256,668       --   13,665,822
Mohr, Davidow Ventures
 and affiliates
 (Jonathan D. Feiber)...  9,824,680   666,666 1,917,808 1,256,668 1,266,322  14,932,144
Hon Wah Chin............        --        --     44,000    33,000     8,000      85,000
Michael A. Dillon.......        --        --        --        --      4,000       4,000
Andrew W. Page..........        --        --        --        --    150,000     150,000
Williams Communications
 (Mathew W. Bross)......        --        --        --        --  1,725,364   1,725,364
James F. Jordan.........        --  1,333,334       --        --        --    1,333,334
Gregory B. Maffei.......                                            160,000     160,000
Price per share.........      $0.24     $0.75     $0.91     $1.82     $6.32
</TABLE>

                                       61
<PAGE>

Registration Rights

   We have entered into an investors' rights agreement with each of the
purchasers of preferred stock set forth above. Under this agreement, these and
other stockholders are entitled to registration rights with respect to their
shares of common stock issuable upon conversion of their preferred stock upon
the closing of this offering. Following this offering, holders of 80,618,893
shares of our common stock will be entitled to registration rights with respect
to the shares of common stock. See "Description of Capital Stock--Registration
Rights".

Loans to Executive Officers and Directors in Connection with Exercise of
Options

   In connection with the option exercises described under "Management--
Director Compensation" and "Management--Executive Compensation", the following
executive officers and directors delivered promissory notes, each with a five-
year term, in the amounts and bearing interest as indicated below:

   In December 1999, we made a loan to Hugh C. Martin, our Chairman, President
and Chief Executive Officer, in connection with his exercise of an option to
acquire 1,215,834 shares of common stock, for an aggregate purchase price of
$1,519,793. The loan is evidenced by a promissory note in the principal amount
of $1,519,793, with interest compounded annually on the unpaid balance at a
rate of 6.20% per year.

   In November and December 1999, we made two loans to Terrence J. Schmid, our
former Chief Financial Officer and Vice President, Finance and Administration,
in connection with his exercise of options to acquire 120,000 shares and
200,000 shares, respectively, of common stock, for an aggregate purchase price
of $260,800. The loans are evidenced by a promissory note in the principal
amount of $10,800, with interest compounded annually on the unpaid balance at a
rate of 6.08% per year, and a promissory note in the principal amount of
$250,000, with interest compounded annually on the unpaid balance at a rate of
6.20% per year.

   In November 1999, we made three loans to William R. Cumpston, our Senior
Vice President, Engineering and Operations, in connection with his exercise of
options to acquire 1,000,000 shares of common stock, for an aggregate purchase
of $254,000. The loans are evidenced by a promissory note in the principal
amount of $45,000, with interest compounded annually on the unpaid balance at a
rate of 6.08% per year, a promissory note in the principal amount of $182,000,
with interest compounded annually on the unpaid balance at a rate of 6.08% per
year and a promissory note in the principal amount of $27,000, with interest
compounded annually on the unpaid balance at a rate of 6.08% per year. In
December 1999, we made another loan to Mr. Cumpston, in connection with his
exercise of an option to acquire 300,000 shares of common stock, for an
aggregate purchase price of $375,000. The loan is evidenced by a promissory
note in the principal amount of $375,000, with interest compounded annually on
the unpaid balance at a rate of 6.20% per year.

   In November 1999, we made a loan to Hon Wah Chin, our Chief Technical
Officer, in connection with his exercise of options to acquire 100,000 shares
of common stock, for an aggregate purchase price of $9,000. The loan is
evidenced by a promissory note in the principal amount of $9,000, with interest
compounded annually on the unpaid balance at a rate of 6.08% per year. In
December 1999, we made another loan to Mr. Chin in connection with his exercise
of an option to acquire 100,000 shares of common stock, for an aggregate
purchase price of $125,000. The loan is evidenced by a promissory note in the
principal amount of $125,000, with interest compounded annually on the unpaid
balance at a rate of 6.20% per year.

   In November 1999, we made a loan to Michael A. Dillon, our Vice President
and General Counsel, in connection with his exercise of an option to acquire
300,000 shares of common stock, for a purchase price of $273,000. The loan is
evidenced by a promissory note in the principal amount of $273,000, with
interest compounded annually on the unpaid balance at a rate of 6.08% per year.
In

                                       62
<PAGE>

February 2000, we made another loan to Mr. Dillon in connection with his
exercise of an option to acquire 70,000 shares of common stock. The loan is
evidenced by a promissory note in the principal amount of $87,500, with
interest compounded annually at a rate of 6.56% per year.

   In March 2000, we made a loan to Robert J. Jandro, our Executive Vice
President, Worldwide Sales and Marketing, in connection with his exercise of an
option to acquire 900,000 shares of common stock, for a purchase price of
$2,880,000. The loan is evidenced by a promissory note in the principal amount
of $2,880,000, with interest compounded annually on the unpaid balance at a
rate of 6.80% per year.

   In March 2000, we made a loan to Andrew W. Page, our Vice President,
Corporate Development, in connection with his exercise of an option to acquire
300,000 shares of common stock for a purchase price of $960,000. The loan is
evidenced by a promissory note in the principal amount of $960,000, with
interest compounded annually on the unpaid balance at a rate of 6.80% per year.

Sales of Restricted Common Stock and Any Related Loans to Executive Officers
and Directors

   We made the following additional sales of securities to executive officers
and directors. Unless otherwise noted:

  .  shares vest over a four-year period and we have a repurchase option for
     unvested shares;

  .  in the event of a change of control of ONI Systems, our repurchase
     option will lapse as to 50% of the then-unvested shares; and

  .  the associated promissory notes have five-year terms.

   In January 1998, Hugh C. Martin, our Chairman, President and Chief Executive
Officer, purchased 4,066,540 shares of common stock for $0.005 per share. Mr.
Martin paid for the shares with a promissory note in the principal amount of
$19,696 with interest compounded annually on the unpaid balance at a rate of
6.13% per year due on the earlier of ten years from issuance or 180 days
following termination of employment.

   In January 1998, Hugh C. Martin purchased 717,624 shares of common stock for
$0.005 per share. Mr. Martin paid for the shares with a promissory note in the
principal amount of $3,476 with interest compounded annually on the unpaid
balance at a rate of 6.13% per year due on the earlier of ten years from
issuance or 180 days following termination of employment. The shares under the
agreement vest based on achievement of 1998 milestones and 1999 milestones. The
milestones were achieved and our repurchase option has lapsed.

   In February 1998, Terrence J. Schmid, our former Chief Financial Officer and
Vice President, Finance and Administration, purchased 533,332 shares of our
common stock for $0.08 per share. Mr. Schmid paid for the shares with a
promissory note in the principal amount of $40,000 with interest compounded
annually on the unpaid balance at a rate of 5.93% per year due on the earlier
of ten years from issuance or 210 days following this offering.

   In November 1998, Hon Wah Chin, our Chief Technical Officer, purchased
674,000 shares for $0.09 per share. Mr. Chin paid for the shares with a
promissory note in the principal amount of $59,413 with interest compounded
semi-annually on the unpaid balance at a rate of 4.46% per year.

   In December 1999, Michael A. Dillon, our Vice President, General Counsel and
Secretary, purchased 20,000 shares for $0.91 per share. Mr. Dillon paid for the
shares with a promissory note in the principal amount of $18,200 with interest
compounded annually on the unpaid balance at a rate of 6.20% per year. We have
no repurchase right for these shares.

                                       63
<PAGE>

Persons or Entities Related to Our Officers and Directors

   In addition to the sales of securities previously described, we have entered
into agreements with affiliates of our officers and directors.

   Williams Communications, Inc. is a stockholder of ONI Systems. Mathew W.
Bross, one of our directors, serves as Senior Vice President and Chief
Technology Officer of Williams Communications, Inc. In March 2000, we entered
into a purchase and license agreement with Williams Communications, in which
Williams Communications may, but is not obligated to, purchase $30.0 million of
our products. The agreement also provides that Williams Communications will
purchase $1,215,506 of our products during the first quarter of calendar year
2000. The agreement expires June 30, 2001, unless earlier terminated by the
parties. In December 1999, we also executed a redemption and repurchase
agreement with Williams Communications, which provides us with the right to
repurchase, if Williams Communications fails to purchase $30.0 million of our
products and services by June 30, 2001, at $6.32 per share, the shares of
Series G preferred stock owned by Williams Communications, which are
convertible into 1,582,904 shares of common stock. The agreement also provided
Williams Communications with the right to require us to redeem the shares held
by it at $8.50 per share, which right lapsed upon completion of lab trials for
our ONLINE9000 product in March 2000.

                                       64
<PAGE>

                             PRINCIPAL STOCKHOLDERS

   The following table presents information as to the beneficial ownership of
common stock as of March 31, 2000 and as adjusted to reflect the sale of common
stock in this offering by:

  . each stockholder known by us to be the beneficial owner of more than 5%
    of our common stock;

  . each of our directors;

  . each of our named executive officers; and

  . all of our directors and executive officers as a group.

   Beneficial ownership is determined under the rules of the Securities and
Exchange Commission and generally includes voting or investment power with
respect to securities. Unless indicated below, to our knowledge, the persons
and entities named in the table have sole voting and sole investment power with
respect to all shares beneficially owned, subject to community property laws
where applicable. Shares of common stock subject to options that are currently
exercisable or exercisable within 60 days of March 31, 2000 are deemed to be
outstanding and to be beneficially owned by the person holding the options for
the purpose of computing the percentage ownership of that person but are not
treated as outstanding for the purpose of computing the percentage ownership of
any other person. Unless indicated below, the address for each listed
stockholder is c/o ONI Systems Corp., 166 Baypointe Parkway, San Jose,
California 95134-1621.

   The percentage of common stock outstanding as of March 31, 2000 is based on
114,138,775 shares of common stock outstanding on that date, assuming that all
outstanding preferred stock has been converted into common stock. The
percentage of common stock outstanding following this offering is based on
123,668,472 shares of common stock.

<TABLE>
<CAPTION>
                                                         Percentage of
                                                      Outstanding Shares
                                                      Beneficially Owned
                                                      ---------------------
                                    Number of Shares   Before       After
Name of Beneficial Owner           Beneficially Owned Offering    Offering
------------------------           ------------------ ---------   ---------
<S>                                <C>                <C>         <C>
Jonathan D. Feiber (1)............     14,932,144            13.1        12.1
  Mohr, Davidow Ventures and
   affiliates
Kevin R. Compton (2)..............     13,665,822            12.0        11.1
  Kleiner Perkins Caufield & Byers
   and affiliates
Hugh C. Martin (3)................      5,999,998             5.3         4.9
Matthew W. Bross (4)..............      1,905,364             1.7         1.5
  Williams Communications, Inc.
James F. Jordan (5)...............      1,873,334             1.6         1.5
William R. Cumpston (6)...........      1,252,000             1.1         1.0
Hon Wah Chin (7)..................        954,000               *           *
Terrence J. Schmid (8)............        277,050               *           *
Gregory B. Maffei (9).............        280,000               *           *
All executive officers and
 directors
 as a group (12 persons) (10).....     42,606,662            37.3        34.5
</TABLE>
--------
  *  Represents beneficial ownership of less than 1%

 (1) Represents 12,709,218 shares held by held by Mohr, Davidow Ventures V,
     L.P., 1,266,322 shares held by Mohr, Davidow Ventures V-L, L.P. and
     956,604 shares held by Mohr, Davidow Ventures V, L.P. as nominee for MDV
     Entrepreneurs' Network Fund II (A), L.P. and MDV Entrepreneurs' Network
     Fund II (B), L.P. and the shares represented exclude 346,348 shares held
     by the Mohr Family Trust UTA dated 8/5/1985, 10,000 shares held by the
     Sarah H. Mohr Trust UTA dated 9/19/97, and 10,000 shares held by the Hope
     A. Mohr Trust

                                       65
<PAGE>

    UTA dated 9/19/97. Mohr, Davidow Ventures disclaims beneficial ownership
    of the shares held by the Mohr Family Trust, the Sarah H. Mohr Trust and
    the Hope A. Mohr Trust and these trusts disclaim beneficial ownership of
    the shares held by the Mohr, Davidow Ventures entities. Jonathan
    D. Feiber, a director of ONI Systems, is also a general partner of Mohr,
    Davidow Ventures. Mr. Feiber disclaims beneficial ownership of shares held
    by Mohr, Davidow Ventures and affiliates except to the extent of his
    interest in Mohr, Davidow Ventures and affiliates. The address of Mohr,
    Davidow Ventures and Mr. Feiber is 2775 Sand Hill Road, Suite 240,
    Menlo Park, California 94025.

 (2) Represents 12,709,828 shares held by Kleiner Perkins Caufield & Byers
     VIII, L.P., 614,350 shares held by KPCB VIII Founders Fund and 341,644
     shares held by KPCB Information Sciences Zaibatsu Fund II. Kevin R.
     Compton, a director of ONI Systems, is also a general partner of Kleiner
     Perkins Caufield & Byers. Mr. Compton disclaims beneficial ownership of
     shares held by KPCB and affiliates except to the extent of his interest
     in KPCB and affiliates. The address of Kleiner Perkins Caulfield & Byers
     and Mr. Compton is 2750 Sand Hill Road, Menlo Park, California 94025.

 (3) Represents 5,886,998 shares held by Mr. Martin, 45,000 shares held by the
     Hugh C. Martin 2000 Grantor Retained Annuity Trust under agreement dated
     March 23, 2000, 45,000 shares held by the Moira C. Martin 2000 Grantor
     Retained Annuity Trust under agreement dated March 23, 2000 and 3,000
     shares held by The Martin Family 2000 Irrevocable Trust under agreement
     dated March 23, 2000. Includes 1,863,831 shares subject to a repurchase
     right that lapses at a rate of 84,719 shares per month until January
     2002. Includes 1,139,844 shares subject to a repurchase right that lapses
     at a rate of 25,329 shares per month until December 2003.

 (4) Represents 142,460 shares held by Matthew W. Bross Revocable Trust and
     1,582,904 shares held by Williams Communications, Inc. Mr. Bross serves
     as Senior Vice President and Chief Technology Officer of Williams
     Communications and disclaims beneficial ownership of shares held by it.
     Includes 180,000 shares subject to a repurchase right that lapses as to
     45,000 shares in November 2000 and lapses at a rate of 3,750 shares per
     month thereafter until November 2003.

 (5) Includes 180,000 shares held by Mr. Jordan subject to a repurchase right
     that lapses at a rate of 7,500 shares per month until March 2002.
     Includes 90,000 shares subject to a repurchase right that lapses at a
     rate of 5,000 shares per month until October 2001.

 (6) Represents 1,190,000 shares held by Mr. Cumpston, 30,000 shares held by
     the William R. Cumpston 2000 Grantor Annuity Trust under agreement dated
     February 21, 2000, 30,000 shares held by Christine S. Cumpston 2000
     Grantor Annuity Trust under agreement dated February 21, 2000 and 2,000
     shares held by The Cumpston Children's 2000 Trust under agreement dated
     February 21, 2000. Includes 312,500 shares subject to a repurchase right
     that lapses at a rate of 10,416 shares per month until September 2002.
     Includes 212,500 shares subject to a repurchase right that lapses at a
     rate of 6,250 shares per month until January 2003. Includes 200,000
     shares subject to a repurchase right that lapses as to 50,000 shares in
     September 2000 and lapses at a rate of 4,166 shares per month until
     September 2003. Includes 281,250 shares subject to a repurchase right
     that lapses at a rate of 6,250 shares per month until December 2003.

 (7) Includes 379,125 shares held by Mr. Chin subject to a repurchase right
     that lapses at a rate of 14,041 shares per month until June 2002.
     Includes 100,000 shares subject to a repurchase right that lapses as to
     25,000 shares in July 2000 and lapses at a rate of 2,083 shares per month
     thereafter until July 2003. Includes 93,750 shares subject to a
     repurchase right that lapses at a rate of 2,083 shares per month until
     December 2003.


                                      66
<PAGE>

 (8) Reflects our repurchase on April 28, 2000 of all unvested shares of common
     stock held by Mr. Schmid.

 (9) Includes 120,000 shares held by Mr. Maffei subject to a repurchase right
     that lapses as to 40,000 shares in March 2001 and lapses at a rate of
     3,333 shares per month thereafter until March 2003.

(10) Includes shares held by entities affiliated with directors as described in
     notes 1, 2 and 4 and shares issuable upon exercise of options exercisable
     within 60 days of March 31, 2000. Excludes 1,000,000 shares subject to an
     option which we granted to Chris A. Davis, our Executive Vice President,
     Chief Financial and Administrative Officer. Also excludes shares held by
     Mr. Schmid, our former Chief Financial Officer and Vice President, Finance
     and Administration.

                                       67
<PAGE>

                          DESCRIPTION OF CAPITAL STOCK

   Immediately following the closing of this offering, our authorized capital
stock will consist of:

  . 700,000,000 shares of common stock, $0.0001 par value per share; and

  . 10,000,000 shares of preferred stock, $0.0001 par value per share.

   As of March 31, 2000, and assuming the conversion of all outstanding
preferred stock into common stock, there were outstanding:

  . 114,138,775 shares of common stock held by approximately 480
    stockholders, of which 10,096,968 shares were subject to our right of
    repurchase;

  . options to purchase 19,343,345 shares of common stock; and

  . warrants to purchase 1,434,394 shares of common stock.

   The number of shares of common stock outstanding as of March 31, 2000 does
not include:

  . 969,697 shares of common stock into which the shares of Series H
    preferred stock sold to Sun Microsystems in May 2000 will automatically
    convert upon completion of this offering;

  . 160,000 shares of common stock issuable to Internet Initiative Japan upon
    the closing of a private placement, concurrent with this offering; and

  . 400,000 shares of common stock issuable to CCT Telecom upon the closing
    of a private placement, concurrent with this offering.

Common Stock

   Dividend rights. Subject to preferences that may apply to shares of
preferred stock outstanding at the time, the holders of outstanding shares of
common stock are entitled to receive dividends out of assets legally available
at the times and in the amounts that our board of directors may determine.

   Voting rights. Each holder of common stock is entitled to one vote for each
share of common stock held on all matters submitted to a vote of stockholders.
Cumulative voting for the election of directors is not provided for in our
certificate of incorporation. In addition, our certificate of incorporation and
bylaws require the approval of two-thirds, rather than a majority, of the
shares entitled to vote for certain matters. For a description of these
matters, see "--Anti-Takeover Provisions".

   Cisco Systems, Inc., a holder of preferred stock that will convert into
4,969,148 shares of common stock upon the closing of this offering, is subject
to voting restrictions that provide that Cisco and its affiliates must vote, in
certain transactions, all shares owned by them in the same proportion as other
shares voted in the same class in a class vote, or in the same proportion as
all shares voted in a vote in which common stock and preferred stock vote
together as a single class. These transactions include mergers,
reorganizations, ONI Systems being acquired, or an underwritten public offering
of our securities. In addition, Cisco may not exercise any dissenter's or
appraisal rights. These restrictions have no termination date.

   No preemptive or similar rights. Our common stock is not entitled to
preemptive rights and is not subject to conversion or redemption.

   Right to receive liquidation distributions. Upon a liquidation, dissolution
or winding-up of ONI Systems, the holders of our common stock are entitled to
share ratably among themselves in all assets remaining after payment of all
liabilities and the liquidation preferences of any outstanding preferred stock.

                                       68
<PAGE>

Preferred Stock

   Upon the closing of this offering, each outstanding share of our preferred
stock will be converted into shares of common stock. See notes 9 and 13 of
notes to our consolidated financial statements for a description of preferred
stock.

   Following this offering, we will be authorized, subject to limitations
imposed by Delaware law, to issue preferred stock in one or more series, to
establish from time to time the number of shares to be included in each series,
and to fix the rights, preferences and privileges of the shares of each wholly
unissued series and any of its qualifications, limitations or restrictions. Our
board of directors can also increase or decrease the number of shares of any
series, but not below the number of shares of that series then outstanding,
without any further vote or action by the stockholders. Our board of directors
may authorize the issuance of preferred stock with voting or conversion rights
that could adversely affect the voting power or other rights of the holders of
the common stock. The issuance of preferred stock, while providing flexibility
in connection with possible acquisitions and other corporate purposes, could,
among other things, have the effect of delaying, deferring or preventing a
change in control of ONI Systems and might adversely affect the market price of
our common stock and the voting and other rights of the holders of common
stock. We have no current plan to issue any shares of preferred stock.

Warrants

   Warrants to purchase 1,434,394 shares of common stock were outstanding as of
March 31, 2000. All warrants to purchase preferred stock will automatically
convert into warrants to purchase a like number of shares of common stock upon
the closing of this offering.

   In December 1999, we issued to a customer a warrant to purchase 500,000
shares of common stock at an exercise price of $0.91 per share. If not sooner
exercised, this warrant will remain outstanding until six years from the date
of the warrant agreement.

   In February 1999, we issued to an equipment finance company warrants to
purchase 277,926 shares of Series B preferred stock at an exercise price of
$0.88 per share. If not sooner exercised, these warrants will remain
outstanding for the lesser of five years after the completion of this offering
or ten years from the date of the warrant agreements.

   In February 2000, we issued to a customer a warrant to purchase 223,000
shares of common stock at an exercise price of $0.91 per share. If not sooner
exercised, this warrant will remain outstanding until seven years from the date
of the warrant agreement.

   In March 2000, we issued to our outside counsel a warrant to purchase
200,000 shares of common stock at an exercise price of $15.00 per share. If not
sooner exercised, this warrant will remain outstanding until March 2004.

   In connection with our spin-out from Optivision in December 1997, we are
obligated to issue 233,468 shares of common stock to an equipment finance
company upon the exercise by the finance company of its warrants to purchase
capital stock of Optivision. See "Related Party Transactions--Optivision Spin-
out". We will not receive any proceeds from the exercise of these warrants. If
not sooner exercised, 88,890 shares subject to the warrants will remain
outstanding until January 2002 and 144,578 shares subject to the warrants will
remain outstanding until September 2003.

Registration Rights

   Following this offering, the holders of 80,618,893 shares of common stock
will be entitled to rights with respect to the registration of these shares
under the Securities Act, as described below.

   Demand registration rights. At any time after six months following the
expiration of the lock-up agreements in connection with this offering, the
holders of at least 50% of the shares having registration

                                       69
<PAGE>

rights can request that we register all or a portion of their shares, so long
as such registration covers at least 33% of their shares or the total offering
price of the shares to the public is at least $5.0 million. See "Share Eligible
for Future Sale--Lock-up Agreements". We will only be required to file two
registration statements in response to their demand registration rights if both
registration statements have been declared effective. We may postpone the
filing of a registration statement for up to 120 days if we determine that the
filing would be seriously detrimental to us and our stockholders.

   Piggyback registration rights. If we register any securities for public
sale, the stockholders with registration rights will have the right to include
their shares in the registration statement. The managing underwriter of any
underwritten offering will have the right to limit the number of shares
registered by these holders to be included in the registration statement due to
marketing reasons.

   Form S-3 registration rights. The holders of the shares having registration
rights can request that we register their shares if we are eligible to file a
registration statement on Form S-3 or any successor form and if the total price
of the shares offered to the public is at least $1.0 million. We may postpone
the filing of a Form S-3 registration statement for up to 120 days once in a 12
month period if we determine that the filing would be seriously detrimental to
us and our stockholders. We may also postpone the filing of a Form S-3
registration statement if within the preceding six months, we have already
effected a registration on Form S-3.

   We will pay all expenses incurred in connection with the registrations
described above, except that we will not be required to pay for expenses
incurred under exercise of stockholders' demand registration rights if the
holders of these rights subsequently withdraw their request for registration.

   Holders of these registration rights have waived the exercise of these
registration rights for 180 days following the date of this prospectus.

   In addition to these registration rights, holders of warrants exercisable
for 1,156,468 shares of common stock will have registration rights for the
shares of common stock issuable upon the exercise of their warrants. See "--
Warrants".

Anti-Takeover Provisions

   The provisions of Delaware law, our certificate of incorporation and our
bylaws may have the effect of delaying, deferring or preventing another person
from acquiring control of ONI Systems.

 Delaware Law

   We will be subject to the provisions of Section 203 of the Delaware General
Corporation Law regulating corporate takeovers. This section prevents some
Delaware corporations from engaging, under some circumstances, in a business
combination, which includes a merger or sale of more than 10% of the
corporation's assets with any interested stockholder, meaning a stockholder
who, together with affiliates and associates, owns or, within three years prior
to the determination of interested stockholder status, did own 15% or more of
the corporation's outstanding voting stock, unless:

  . the transaction is approved by the board of directors prior to the date
    the interested stockholder attained that status;

  . upon consummation of the transaction that resulted in the stockholder's
    becoming an interested stockholder, the interested stockholder owned at
    least 85% of the voting stock of the corporation outstanding at the time
    the transaction commenced; or

  . on or subsequent to that date the business combination is approved by the
    board of directors and authorized at an annual or special meeting of
    stockholders by at least two-thirds of the outstanding voting stock that
    is not owned by the interested stockholder.

   This section may have an anti-takeover effect with respect to transactions
not approved in advance by the board of directors, including discouraging
attempts to acquire us that might result in a premium over the market price for
the shares of stock held by stockholders.

                                       70
<PAGE>

 Charter and Bylaw Provisions

   Our certificate of incorporation and bylaws provide that:

  . following the completion of this offering, no action may be taken by
    stockholders except at an annual or special meeting of the stockholders
    called in accordance with our bylaws and stockholders may not act by
    written consent;

  . following the completion of this offering, the approval of holders of
    two-thirds of the shares entitled to vote at an election of directors
    will be required to adopt, amend or repeal our bylaws or amend or repeal
    the provisions of our certificate of incorporation regarding the election
    and removal of directors and ability of stockholders to take action;

  . stockholders may not fill vacancies on the board, unless the board of
    directors determines by resolution that any of these vacancies will be
    filled by the stockholders;

  . following the completion of this offering, our board of directors will be
    divided into three classes, each serving staggered three-year terms,
    which means that only one class of directors will be elected at each
    annual meeting of stockholders, with the other classes continuing for the
    remainder of their respective terms. For more information on the
    classification of our board, please see "Management--Board Composition";
    and

  . we will indemnify officers and directors against losses that they may
    incur in investigations and legal proceedings resulting from their
    services to us, which may include services in connection with takeover
    defense measures.

California Foreign Corporation Law

   Section 2115 of the California Corporations Code provides that under some
circumstances several provisions of the California Corporations Code may be
applied to foreign corporations qualified to do business in California
notwithstanding the law of the jurisdiction where the corporation is
incorporated. These corporations are referred to in this prospectus as quasi-
California corporations. Section 2115 applies to foreign corporations that
have more than half of their voting stock held by stockholders residing in
California and more than half of their business deriving from California,
measured on or after the 135th day of the corporation's fiscal year. If we
were determined to be a quasi-California corporation, we would have to comply
with California law with respect to, among other things, elections of
directors and distributions to stockholders. Under the California Corporations
Code, a corporation is prohibited from paying dividends unless:

  . the retained earnings of the corporation immediately prior to the
    distribution equal or exceed the amount of the proposed distribution; or

  . the assets of the corporation, exclusive of specific non-tangible assets,
    equal or exceed 1 1/4 times its liabilities, exclusive of specific
    liabilities, and the current assets of the corporation at least equal its
    current liabilities. If the average pre-tax net earnings of the
    corporation before interest expense for the two years preceding the
    distribution were less than the average interest expense of the
    corporation for those year, however, the current assets of the
    corporation must exceed 1 1/4 times its current liabilities.

   Following this offering, we will be exempt from the application of Section
2115 if our voting stock is held by more than 800 stockholders of record.

Transfer Agent and Registrar

   The transfer agent and registrar for our common stock is ChaseMellon
Shareholder Services, L.L.C.

Listing

   Our common stock has been approved for listing on the Nasdaq National
Market under the trading symbol "ONIS".

                                      71
<PAGE>

                        SHARES ELIGIBLE FOR FUTURE SALE

   Prior to this offering, there has been no public market for our common
stock, and we cannot predict the effect, if any, that market sales of shares of
our common stock or the availability of shares of our common stock for sale
will have on the market price of our common stock prevailing from time to time.
Nevertheless, sales of substantial amounts of our common stock in the public
market could adversely affect the market price of our common stock and could
impair our future ability to raise capital through the sale of our equity
securities.

   Upon the completion of this offering, we will have 123,668,472 shares of
common stock outstanding, assuming no exercise of the underwriters' over-
allotment option and no exercise of outstanding options or warrants. Of the
outstanding shares, all of the shares sold in this offering will be freely
tradable, except that any shares held by our affiliates, as that term is
defined in Rule 144 promulgated under the Securities Act, may only be sold in
compliance with the limitations described below. The remaining 115,668,472
shares of common stock will be deemed restricted securities as defined under
Rule 144. Restricted shares may be sold in the public market only if registered
or if they qualify for an exemption from registration under Rule 144, 144(k) or
701 promulgated under the Securities Act, which rules are summarized below.
Subject to the lock-up agreements described below and the provisions of Rules
144, 144(k) and 701, additional shares will be available for sale in the public
market as follows:

<TABLE>
<CAPTION>
     Number of
      Shares                               Comment
     ---------                             -------
   <C>         <S>
       849,636 After the date of this prospectus, freely tradable shares sold
               in this offering and shares saleable under Rule 144(k) that are
               not subject to the 180-day lock-up.

   101,125,721 After 180 days from the date of this prospectus, the 180-day
               lock-up terminates and these shares are saleable under Rule 144
               (subject in some cases to volume limitations), Rule 144(k) or
               Rule 701 (subject in some cases to a right of repurchase by ONI
               Systems).

     9,707,206 On December 22, 2000, these shares are saleable under Rule 144.

     1,009,180 On December 24, 2000, these shares are saleable under Rule 144.

     1,108,032 On December 30, 2000, these shares are saleable under Rule 144.

       339,000 On March 9, 2001, these shares are saleable under Rule 144.

       969,697 On May 9, 2001, these shares are saleable under Rule 144.

       560,000 One year after the closing of this offering, these shares are
               saleable under Rule 144.
</TABLE>

   Some of the shares in the table above, including shares held by executive
officers and directors, listed as not being saleable until 180 days after the
date of this prospectus may become salable at a sooner date, as described
further below.

Lock-up Agreements

   ONI Systems and holders of approximately 99.1% of our common stock,
including each of our officers and directors, have agreed, subject to specified
exceptions, not to, without the prior written consent of Goldman, Sachs & Co.,
offer, sell, contract to sell, grant any option to purchase or otherwise
dispose of any shares of our common stock or options to acquire shares of our
common stock during the 180-day period following the date of this offering.
Goldman, Sachs & Co. may, in its sole discretion and at any time without
notice, release all or any portion of the securities subject to lock-up
agreements. See "Underwriting".

                                       72
<PAGE>

   Except for shares held by executive officers, the 180-day restriction will
expire as to 10% of the shares subject to the restriction, or 8,477,114 shares,
on the later of September 6, 2000 or the 90th day after the date of this
prospectus, if the reported last sale price of our common stock on the Nasdaq
National Market for 20 of the 30 trading days ending on the last trading day
preceding that date is at least twice the initial public offering price per
share. The 180-day restriction will also expire as to an additional 25% of the
shares subject to the restriction, or 25,281,430 shares, on the date that is
two days after we have made our financial statements for the fiscal quarter
ending September 30, 2000 publicly available, if the reported last sale price
of our common stock on the Nasdaq National Market for 20 of the 30 trading days
ending on the last trading day preceding that date is at least twice the
initial public offering price per share. We adopted an insider trading policy
under which employees are prohibited from selling shares from the 30th day
prior to the end of each quarter until the second day following the release of
financial results for the quarter. As a result, the release of shares held by
them under lock-up agreements may be delayed until our insider trading policy
permits such sales.

Rule 144

   In general, under Rule 144 as currently in effect, a person, or group of
persons whose shares are required to be aggregated, who has beneficially owned
shares that are restricted securities as defined in Rule 144 for at least one
year is entitled to sell within any three-month period commencing 90 days after
the date of this prospectus, a number of shares that does not exceed the
greater of one percent of the then outstanding shares of our common stock,
which will be approximately 1,236,685 shares immediately after this offering,
or the average weekly trading volume in our common stock during the four
calendar weeks preceding the date on which notice of the sale is filed. In
addition, a person who is not deemed to have been an affiliate at any time
during the three months preceding a sale and who has beneficially owned the
shares proposed to be sold for at least two years would be entitled to sell
these shares under Rule 144(k) without regard to the requirements described
above. To the extent that shares were acquired from one of our affiliates, a
person's holding period for the purpose of effecting a sale under Rule 144
would commence on the date of transfer from the affiliate.

Rule 701

   In general, under Rule 701 of the Securities Act, any of our employees,
officers, directors, consultants or advisors who purchased shares from us in
connection with a compensatory stock or option plan or other written agreement
is eligible to resell those shares in reliance on Rule 144, but without
compliance with certain restrictions, including the holding period contained in
Rule 144. However, all shares issued under Rule 701 are subject to lock-up
agreements and will only become eligible for sale at the expiration of such
agreements.

Stock Options

   As of March 31, 2000, options to purchase a total of 19,343,345 shares of
common stock were outstanding. We intend to file a Form S-8 registration
statement under the Securities Act to register all shares of common stock
subject to outstanding options, all shares of our common stock issued upon
exercise of stock options and all shares of our common stock issuable under our
stock option and employee stock purchase plans. Accordingly, shares of our
common stock issued under these plans will be eligible for sale in the public
markets, subject to vesting restrictions and the lock-up agreement described
above. See "Management--Employee Benefit Plans".

Registration Rights

   Following this offering, subject to specified blackout periods, holders of
80,618,893 shares of outstanding common stock will have two demand registration
rights with respect to their shares of our

                                       73
<PAGE>

common stock, subject to the 180-day lock-up arrangement described above, to
require us to register their shares of our common stock under the Securities
Act, or rights to participate in any future registration of securities by us.
If the holders of these registrable securities request that we register their
shares, and if the registration is effected, these shares will become freely
tradable without restriction under the Securities Act. Any sales of securities
by these stockholders could have a material adverse effect on the trading price
of our common stock. See "Description of Capital Stock--Registration Rights".

                                       74
<PAGE>

                                  UNDERWRITING

   ONI Systems and the underwriters named below have entered into an
underwriting agreement with respect to the shares being offered. Subject to
some conditions, each underwriter has severally agreed to purchase the number
of shares indicated in the following table. Goldman, Sachs & Co., Banc of
America Securities LLC, Chase Securities Inc. and FleetBoston Robertson
Stephens Inc. are the representatives of the underwriters.

<TABLE>
<CAPTION>
                                                                       Number of
                              Underwriters                              Shares
                              ------------                             ---------
   <S>                                                                 <C>
   Goldman, Sachs & Co................................................ 3,340,000
   Banc of America Securities LLC..................................... 1,260,000
   Chase Securities Inc............................................... 1,485,000
   FleetBoston Robertson Stephens Inc. ............................... 1,335,000
   Lehman Brothers Inc. ..............................................   145,000
   J.P. Morgan Securities Inc. .......................................   145,000
   Salomon Smith Barney Inc. .........................................   145,000
   UBS Warburg LLC....................................................   145,000
                                                                       ---------
     Total............................................................ 8,000,000
                                                                       =========
</TABLE>

   If the underwriters sell more shares than the total number set forth in the
table above, the underwriters have an option to buy up to an additional
1,200,000 shares from ONI Systems to cover such sales. They may exercise that
option for 30 days. If any shares are purchased under this option, the
underwriters will severally purchase shares in approximately the same
proportion as set forth in the table above.

   The following table shows the per share and total underwriting discounts and
commissions to be paid to the underwriters by ONI Systems. Such amounts are
shown assuming both no exercise and full exercise of the underwriters' option
to purchase additional shares.

<TABLE>
<CAPTION>
                                                          Paid by ONI Systems
                                                       -------------------------
                                                       No Exercise Full Exercise
                                                       ----------- -------------
<S>                                                    <C>         <C>
Per share............................................. $      1.75  $      1.75
Total................................................. $14,000,000  $16,100,000
</TABLE>

   Shares sold by the underwriters to the public will initially be offered at
the initial public offering price set forth on the cover of this prospectus.
Any shares sold by the underwriters to securities dealers may be sold at a
discount of up to $1.05 per share from the initial public offering price. Any
such securities dealers may resell any shares purchased from the underwriters
to other brokers or dealers at a discount of up to $0.10 per share from the
initial public offering price. If all the shares are not sold at the initial
public offering price, the representatives may change the offering price and
the other selling terms.

   ONI Systems and its directors, officers, employees and other stockholders
have agreed with the underwriters not to dispose of or hedge any of their
common stock or securities convertible into or exchangeable for shares of
common stock during the period from the date of this prospectus continuing
through the date 180 days after the date of this prospectus, except with the
prior written consent of Goldman, Sachs & Co. and except as described in
"Shares Eligible for Future Sale". This restriction does not apply to any
issuances under ONI Systems' existing employee benefit plans. See "Shares
Eligible for Future Sale" for a discussion of transfer restrictions.

                                       75
<PAGE>

   Prior to this offering, there has been no public market for the shares. The
initial public offering price will be negotiated among ONI Systems and the
representatives. Among the factors to be considered in determining the initial
public offering price of the shares, in addition to prevailing market
conditions, will be ONI Systems' historical performance, estimates of the
business potential and earnings prospects of ONI Systems, an assessment of the
management of ONI Systems and the consideration of the above factors in
relation to market valuation of companies in related businesses.

   ONI Systems' common stock has been approved for quotation on the Nasdaq
National Market under the symbol "ONIS".

   In connection with this offering, the underwriters may purchase and sell
shares of common stock in the open market. These transactions may include short
sales, stabilizing transactions and purchases to cover positions created by
short sales. Short sales involve the sale by the underwriters of a greater
number of shares than they are required to purchase in this offering.
Stabilizing transactions consist of bids or purchases made for the purpose of
preventing or retarding a decline in the market price of the common stock while
the offering is in progress.

   The underwriters may also impose a penalty bid. This occurs when a
particular underwriter repays to the underwriters a portion of the underwriting
discount received by it because the representatives have repurchased shares
sold by or for the account of this underwriter in stabilizing or short covering
transactions.

   These activities by the underwriters may stabilize, maintain or affect the
market price of the common stock. As a result, the price of the common stock
may be higher than the price that otherwise might exist in the open market. If
these activities are commenced, they may be discontinued by the underwriters at
any time. These transactions may be effected on the Nasdaq National Market, in
the over-the-counter market or otherwise.

   At the request of ONI Systems, the underwriters are reserving up to 960,000
shares of common stock for sale at the initial public offering price to
individuals designated by ONI Systems who have expressed an interest in
purchasing the shares of common stock in the offering through a directed share
program. The number of shares available for sale to the general public in the
pubic offering will be reduced to the extent these persons purchase these
reserved shares. Any shares not so purchased will be offered by the
underwriters to the general public on the same basis as the other shares
offered hereby.

   The underwriters do not expect sales to discretionary accounts to exceed
five percent of the total number of shares offered.

   ONI Systems estimates that its share of the total expenses of this offering,
excluding underwriting discounts and commissions, will be approximately $1.5
million.

   ONI Systems has agreed to indemnify the several underwriters against certain
liabilities, including liabilities under the Securities Act of 1933.

   Chase Venture Capital Associates, L.P., an entity affiliated with Chase
Securities Inc., beneficially owns 3,287,672 shares of Series E preferred stock
and 329,978 shares of Series F preferred stock. Paul Johnson, a managing
director of FleetBoston Robertson Stephens Inc., one of the underwriters,
beneficially owns 54,796 shares of Series E preferred stock and 54,996 shares
of Series F preferred stock. Lehman Brothers VC Partners L.P. and Lehman
Brothers Venture Capital Partners I, L.P., affiliates of Lehman Brothers Inc.,
beneficially own 3,835,616 shares of Series E preferred stock.

                                       76
<PAGE>

                            VALIDITY OF COMMON STOCK

   The validity of the issuance of the shares of common stock offered by this
prospectus will be passed upon for ONI Systems by Fenwick & West LLP, Palo
Alto, California. As of the date of this prospectus, Fenwick & West LLP and its
affiliates beneficially own or have the right to purchase an aggregate of
309,996 shares of our common stock. The validity of the issuance of the shares
of common stock offered by this prospectus will be passed upon for the
underwriters by Sullivan & Cromwell, Los Angeles, California.

                                    EXPERTS

   The consolidated financial statements and related financial statement
schedule of ONI Systems Corp. as of December 31, 1998 and 1999 and for the
period from October 20, 1997 (inception) to December 31, 1997, and for each of
the years in the two year period ended December 31, 1999 and the financial
statements of Object-Mart, Inc. as of, and for the year ended, December 31,
1998 and for the six month period ended June 29, 1999, have been included in
this registration statement in reliance upon the report of KPMG LLP,
independent certified public accountants, appearing elsewhere herein, and upon
the authority of said firm as experts in accounting and auditing.

                   WHERE YOU CAN FIND ADDITIONAL 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. For further information with respect to us and our common stock, 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
concerning the contents of any contract or any other document are not
necessarily complete. 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. Each statement in this prospectus relating to a
contract or document filed as an exhibit is qualified in all respects by the
filed exhibit. The registration statement, including exhibits and schedules,
may be inspected without charge at the principal office of the Securities and
Exchange Commission in Washington, D.C., at the Public Reference Room, 450
Fifth Street, N.W. Washington, D.C. 20549 and copies of all or any part of it
may be obtained from that office after payment of fees prescribed by the
Securities and Exchange Commission. You may obtain information on the operation
of the Public Reference Room by calling 1-800-SEC-0330. The Securities and
Exchange Commission maintains a web site that contains reports, proxy and
information statements and other information regarding registrants that file
electronically with the Securities and Exchange Commission at
http://www.sec.gov.

   We intend to provide our stockholders with annual reports containing
financial statements audited by an independent public accounting firm and
quarterly reports containing unaudited financial data for the first three
quarters of each year.

                                       77
<PAGE>

                               ONI SYSTEMS CORP.

                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<S>                                                                        <C>
ONI Systems Corp. Consolidated Financial Statements
  Independent Auditors' Report............................................  F-2
  Consolidated Balance Sheets.............................................  F-3
  Consolidated Statements of Operations...................................  F-4
  Consolidated Statements of Cash Flows...................................  F-5
  Consolidated Statements of Stockholders' (Deficit) Equity...............  F-6
  Notes to Consolidated Financial Statements..............................  F-9

Object-Mart, Inc. Financial Statements
  Independent Auditors' Report............................................ F-26
  Balance Sheet........................................................... F-27
  Statements of Operations................................................ F-28
  Statements of Cash Flows................................................ F-29
  Statements of Shareholders' Equity...................................... F-30
  Notes to Financial Statements........................................... F-31

Unaudited Pro Forma Combined Condensed Statement of Operations
  Introduction to Unaudited Pro Forma Combined Condensed Statement of
   Operations............................................................. F-36
  Unaudited Pro Forma Combined Condensed Statement of Operations.......... F-37
  Notes to Unaudited Pro Forma Combined Condensed Statement of
   Operations............................................................. F-38
</TABLE>

                                      F-1
<PAGE>

                          Independent Auditors' Report

The Board of Directors
ONI Systems Corp.:

   We have audited the accompanying consolidated balance sheets of ONI Systems
Corp. as of December 31, 1998 and 1999, and the related consolidated statements
of operations, stockholders' equity (deficit), and cash flows for the period
from October 20, 1997 (inception) to December 31, 1997 and for each of the
years in the two-year period ended December 31, 1999. These consolidated
financial statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these consolidated financial
statements based on our audits.

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

   In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of ONI Systems
Corp. as of December 31, 1998 and 1999, and the results of its operations and
its cash flows for the period from October 20, 1997 (inception) to December 31,
1997 and for each of the years in the two-year period ended December 31, 1999
in conformity with generally accepted accounting principles.

                                          /s/ KPMG LLP

Mountain View, California
March 9, 2000, except for Note 13
which is as of May 9, 2000

                                      F-2
<PAGE>

                               ONI SYSTEMS CORP.

                          CONSOLIDATED BALANCE SHEETS

<TABLE>
<CAPTION>
                                December 31,              March 31, 2000
                          -------------------------  --------------------------
                             1998          1999         Actual      Pro Forma
                          -----------  ------------  ------------  ------------
                                                            (unaudited)
 <S>                      <C>          <C>           <C>           <C>
         ASSETS
         ------
 Current assets:
  Cash and cash
   equivalents..........  $19,091,688  $ 80,022,591  $ 50,307,041  $ 50,307,041
  Accounts receivable...    1,092,853       163,434     3,928,630     3,928,630
  Inventory.............          --      9,648,856    20,783,774    20,783,774
  Prepaid expenses and
   other current
   assets...............      110,503       770,979       956,609       956,609
                          -----------  ------------  ------------  ------------
    Total current
     assets.............   20,295,044    90,605,860    75,976,054    75,976,054
 Property and equipment.    1,016,698     5,314,990    15,796,067    15,796,067
 Other assets...........          500        24,246        20,678        20,678
 Intangibles............          --        737,500       526,250       526,250
 Goodwill...............          --      4,259,879     3,549,899     3,549,899
                          -----------  ------------  ------------  ------------
    Total assets........  $21,312,242  $100,942,475  $ 95,868,948  $ 95,868,948
                          ===========  ============  ============  ============

 LIABILITIES AND STOCK-
         HOLDERS'
          EQUITY
 ----------------------

 Current liabilities:
  Accounts payable......  $   201,647  $  2,594,555  $  6,014,071  $  6,014,071
  Accrued liabilities...      426,365     6,086,784    10,570,313    10,570,313
  Deferred revenue......          --            --        119,490       119,490
  Current portion of
   capital lease
   obligations..........       40,002       166,612       170,905       170,905
                          -----------  ------------  ------------  ------------
    Total current
     liabilities........      668,014     8,847,951    16,874,779    16,874,779
 Capital lease
  obligations, less
  current portion.......       79,322       366,704       295,378       295,378
                          -----------  ------------  ------------  ------------
    Total liabilities...      747,336     9,214,655    17,170,157    17,170,157
                          -----------  ------------  ------------  ------------
 Commitments and
  contingencies

 Stockholders' equity:
  Convertible preferred
   stock, $0.0001 par
   value per share;
   61,786,664 shares
   authorized at
   December 31, 1998
   and 80,309,408
   shares authorized at
   December 31, 1999
   and March 31, 2000;
   50,580,190,
   78,855,900 and
   79,194,900 shares
   issued and
   outstanding at
   December 31, 1998
   and 1999 and March
   31, 2000,
   respectively;
   aggregate
   liquidation
   preference of
   $28,770,616,
   $125,955,511 and
   $128,127,590 at
   December 31, 1998
   and 1999 and March
   31, 2000,
   respectively; pro
   forma--no shares
   issued and
   outstanding..........        5,058         7,885         7,919           --
  Common stock, $0.0001
   par value per share;
   112,000,000 shares
   authorized at
   December 31, 1998
   and
   159,690,592 shares
   authorized at
   December 31, 1999
   and March 31, 2000;
   18,001,248,
   31,279,590 and
   34,943,875 shares
   issued and
   outstanding at
   December 31, 1998
   and 1999 and March
   31, 2000,
   respectively; pro
   forma--700,000,000
   shares authorized;
   114,138,775 shares
   issued and
   outstanding..........        1,800         3,128         3,494        11,413
  Additional paid-in
   capital..............   34,955,432   186,781,010   268,175,930   268,175,930
  Notes receivable from
   stockholders.........     (122,585)   (3,824,079)   (8,429,521)   (8,429,521)
  Services receivable
   from stockholder.....          --        (85,164)      (48,663)      (48,663)
  Deferred stock com-
   pensation............   (5,223,575)  (35,532,165)  (91,220,282)  (91,220,282)
  Accumulated deficit...   (9,051,224)  (55,622,795)  (89,790,086)  (89,790,086)
                          -----------  ------------  ------------  ------------
    Total stockholders'
     equity.............   20,564,906    91,727,820    78,698,791    78,698,791
                          -----------  ------------  ------------  ------------
      Total liabilities
       and stockholders'
       equity...........  $21,312,242  $100,942,475  $ 95,868,948  $ 95,868,948
                          ===========  ============  ============  ============
</TABLE>

          See accompanying notes to consolidated financial statements.

                                      F-3
<PAGE>

                               ONI SYSTEMS CORP.

                     CONSOLIDATED STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                          Period from
                          October 20,
                              1997
                         (inception) to Year ended December 31,    Three months ended March 31
                          December 31,  -------------------------  -----------------------------
                              1997         1998          1999          1999            2000
                         -------------- -----------  ------------  -------------  --------------
                                                                           (unaudited)
<S>                      <C>            <C>          <C>           <C>            <C>
Revenue.................   $     --     $ 1,732,730  $  3,033,995  $     564,726  $    3,632,636
  Cost of revenue.......         --       1,207,897     1,032,144        424,327       2,849,902
                           ---------    -----------  ------------  -------------  --------------
    Gross profit........         --         524,833     2,001,851        140,399         782,734
                           ---------    -----------  ------------  -------------  --------------
Operating expenses:
  Research and
   development,
   excluding deferred
   stock compensation
   amortization amounts.      38,865      4,008,489    25,399,728      2,849,849      12,037,295
  Sales and marketing,
   excluding deferred
   stock compensation
   amortization
   amounts..............      20,430        649,176     4,557,245        425,939       3,001,883
  General and
   administrative,
   excluding deferred
   stock compensation
   amortization
   amounts..............      49,060      1,590,847     4,755,582        510,336       2,556,173
  Amortization of
   deferred stock
   compensation*........      89,249      3,310,368    11,421,739      1,296,281      13,612,293
  Common stock warrant
   expense..............         --             --      2,890,500            --        4,544,842
  In-process research
   and development......         --             --        170,000            --              --
                           ---------    -----------  ------------  -------------  --------------
    Total operating
     expenses...........     197,604      9,558,880    49,194,794      5,082,405      35,752,486
                           ---------    -----------  ------------  -------------  --------------
    Operating loss......    (197,604)    (9,034,047)  (47,192,943)    (4,942,006)    (34,969,752)
Interest income
 (expense), net.........      (1,452)       182,705       622,972        180,582         867,653
Other income (expense),
 net....................         --             --            --         (13,998)        (62,692)
                           ---------    -----------  ------------  -------------  --------------
    Loss before income
     taxes..............    (199,056)    (8,851,342)  (46,569,971)    (4,775,422)    (34,164,791)
Income taxes............         --             826         1,600          1,600           2,500
                           ---------    -----------  ------------  -------------  --------------
    Net loss............   $(199,056)   $(8,852,168) $(46,571,571) $  (4,777,022) $  (34,167,291)
                           =========    ===========  ============  =============  ==============
Basic and diluted net
 loss per share.........   $   (0.77)   $     (0.74) $      (2.58) $       (0.35) $        (1.41)
                           =========    ===========  ============  =============  ==============
Weighted-average shares
 outstanding used in
 computing basic and
 diluted net loss per
 share..................     257,017     11,918,628    18,043,188     13,541,715      24,218,985
                           =========    ===========  ============  =============  ==============
------------
*  Amortization of
   deferred stock
   compensation:
  Cost of revenue.......   $     --     $       --   $        --   $         --   $    1,628,464
  Research and
   development..........      32,012      2,509,473     8,142,230        986,721       7,348,967
  Sales and marketing...      16,828        160,179     1,583,211         77,390       2,463,575
  General and
   administrative.......      40,409        640,716     1,696,298        232,170       2,171,287
                           ---------    -----------  ------------  -------------  --------------
                           $  89,249    $ 3,310,368  $ 11,421,739  $   1,296,281  $   13,612,293
                           =========    ===========  ============  =============  ==============
</TABLE>


          See accompanying notes to consolidated financial statements.

                                      F-4
<PAGE>

                               ONI SYSTEMS CORP.

                     CONSOLIDATED STATEMENTS OF CASH FLOWS



<TABLE>
<CAPTION>
                         Period from
                         October 20,
                             1997                                  Three months ended March
                        (inception) to  Year ended    Year ended              31
                         December 31,  December 31,  December 31,  -------------------------
                             1997          1998          1999         1999          2000
                        -------------- ------------  ------------  -----------  ------------
                                                                         (unaudited)
<S>                     <C>            <C>           <C>           <C>          <C>
Cash flows from
 operating activities:
 Net loss..............   $(199,056)   $(8,852,168)  $(46,571,571) $(4,777,022) $(34,167,291)
 Adjustments to
  reconcile net loss
  to net cash used in
  operating
  activities:
   Depreciation and
    amortization.......         --         289,265      2,806,047      116,502     1,788,101
   Amortization of
    deferred stock
    compensation.......      89,249      3,310,368     11,421,739    1,296,281    13,612,293
   Loss on disposal of
    property and
    equipment..........         --             --         164,094          --         33,508
   Value of leased
    facilities received
    in exchange for
    preferred stock....         --             --          97,336          --         36,501
   Purchased in-process
    research and
    development........         --             --         170,000          --            --
   Amortization of debt
    financing costs....         --             --          54,572       13,997        29,181
   Common stock warrant
    expense............         --             --       2,890,500          --      4,544,842
   Stock-based
    compensation for
    non-employees......         --             --          73,065          --        200,773
 Changes in operating
  assets and
  liabilities:
   Accounts receivable.     (91,162)    (1,001,691)     1,569,976      521,649    (3,765,196)
   Inventory...........         --             --      (9,648,856)         --    (11,134,918)
   Prepaid expenses and
    other current
    assets.............         --        (111,003)      (533,915)    (207,681)     (211,243)
   Accounts payable....      29,440        172,207      2,392,876      358,306     3,419,516
   Other accrued
    liabilities........      43,760        382,605      5,527,511       61,192     4,483,529
   Deferred revenue....         --             --             --           --        119,490
                          ---------    -----------   ------------  -----------  ------------
     Net cash used in
      operating
      activities.......    (127,769)    (5,810,417)   (29,586,626)  (2,616,776)  (21,010,914)
                          ---------    -----------   ------------  -----------  ------------
Cash flows used in
 investing activities:
 Purchase of property
  and equipment........         --      (1,016,205)    (4,858,824)    (384,581)  (11,381,456)
 Acquisition of
  Object-Mart, net of
  cash acquired........         --             --      (1,744,645)         --            --
                          ---------    -----------   ------------  -----------  ------------
     Net cash used in
      investing
      activities.......         --      (1,016,205)    (6,603,469)    (384,581)  (11,381,456)
                          ---------    -----------   ------------  -----------  ------------
Cash flows from
 financing activities:
 Repayment of short-
  term borrowings......         --        (130,000)           --           --            --
 Proceeds from
  issuance of notes....     130,000            --             --           --            --
 Payments under
  capital lease
  obligations..........         --         (13,651)       (52,589)      (9,520)      (67,033)
 Proceeds from
  issuance of
  preferred stock, net
  of issuance costs....         --      27,015,177     96,889,288    7,220,898     1,960,701
 Repurchase of
  preferred stock......         --      (1,000,000)           --           --            --
 Payment on
  stockholder notes ...         --             --          12,000          --            --
 Proceeds from
  issuance of common
  stock................      10,000         34,553        272,299       39,292       783,152
                          ---------    -----------   ------------  -----------  ------------
     Net cash provided
      by financing
      activities.......     140,000     25,906,079     97,120,998    7,250,670     2,676,820
                          ---------    -----------   ------------  -----------  ------------
     Net increase in
      cash and cash
      equivalents......      12,231     19,079,457     60,930,903    4,249,313   (29,715,550)
Cash and cash
 equivalents at
 beginning of
 year/period...........         --          12,231     19,091,688   19,091,688    80,022,591
                          ---------    -----------   ------------  -----------  ------------
Cash and cash
 equivalents at end of
 year/period...........   $  12,231    $19,091,688   $ 80,022,591  $23,341,001  $ 50,307,041
                          =========    ===========   ============  ===========  ============
Supplemental
 disclosures of cash
 flow information:
 Interest paid during
  year/period..........   $     --     $     4,065   $     15,747  $       --   $        --
                          =========    ===========   ============  ===========  ============
 Noncash investing and
  financing
  activities:
   Equipment recorded
    under capital
    leases.............   $     --     $   132,975   $    466,581  $       --   $        --
                          =========    ===========   ============  ===========  ============
   Contribution of
    property and
    equipment by common
    stockholder........   $  14,716    $   142,067   $        --   $       --   $        --
                          =========    ===========   ============  ===========  ============
   Issuance of common
    stock upon exercise
    of options in
    exchange for notes
    receivable.........   $     --     $   122,585   $  3,713,494  $       --   $  4,605,442
                          =========    ===========   ============  ===========  ============
   Issuance of
    preferred stock in
    exchange for leased
    facilities.........   $     --     $       --    $    182,500  $       --   $        --
                          =========    ===========   ============  ===========  ============
   Issuance of common
    stock in connection
    with Object-Mart,
    Inc. acquisition...   $     --     $       --    $  5,874,677  $       --   $        --
                          =========    ===========   ============  ===========  ============
   Issuance of warrants
    in connection with
    debt financing.....   $     --     $       --    $    203,581  $   203,581  $        --
                          =========    ===========   ============  ===========  ============
   Issuance of common
    stock for future
    services...........   $ 190,875    $ 8,432,317   $ 41,730,329  $ 2,324,092  $ 66,696,890
                          =========    ===========   ============  ===========  ============
</TABLE>

          See accompanying notes to consolidated financial statements.

                                      F-5
<PAGE>

                               ONI SYSTEMS CORP.

           CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY
 Period from October 20, 1997 (inception) to December 31, 1997 and years ended
                          December 31, 1998, 1999 and
              (unaudited) three month period ended March 31, 2000

<TABLE>
<CAPTION>
                     Convertible                                        Notes
                   preferred stock      Common stock    Additional    receivable      Services       Deferred
                  ------------------  -----------------   paid-in        from        receivable       stock      Accumulated
                    Shares    Amount    Shares   Amount   capital    stockholders from stockholder compensation    deficit
                  ----------  ------  ---------- ------ -----------  ------------ ---------------- ------------  -----------
<S>               <C>         <C>     <C>        <C>    <C>          <C>          <C>              <C>           <C>
Balances as of
October 20, 1997
(inception).....         --   $  --          --  $  --  $       --    $     --       $      --     $       --    $       --
Issuance of
common stock....         --      --   11,565,752  1,157      23,559         --              --             --            --
Deferred stock
compensation....         --      --          --     --      190,875         --              --        (190,875)          --
Amortization of
deferred stock
compensation....         --      --          --     --          --          --              --          89,249           --
Issuance of
Series A
preferred stock.   8,000,000     --          --     --          --          --              --             --            --
Net loss........         --      --          --     --          --          --              --             --       (199,056)
                  ----------  ------  ---------- ------ -----------   ---------      ----------    -----------   -----------
Balances as of
December 31,
1997............   8,000,000     --   11,565,752  1,157     214,434         --              --        (101,626)     (199,056)
Issuance of
common stock for
notes
receivable......         --      --    5,991,496    599     121,986    (122,585)            --             --            --
Exercise of
stock purchase
rights for cash.         --      --      440,000     44      27,343         --              --             --            --
Exercise of
options for
cash............         --      --        4,000    --        7,166         --              --             --            --
Contribution of
property and
equipment by
common
stockholder.....         --      --          --     --      142,067         --              --             --            --
Exchange of
Series A
preferred stock
for Series B
preferred stock.  (8,000,000)    --          --     --          --          --              --             --            --
Issuance of
Series B
preferred stock,
net of $50,058
in issuance
costs...........  26,128,843   2,613         --     --    4,206,190         --              --             --            --
Repurchase and
cancellation of
Series B
preferred stock.  (1,333,333)   (133)        --     --     (999,867)        --              --             --            --
Issuance of
Series C
preferred stock,
net of $61,823
in issuance
costs...........   2,733,332     273         --     --    1,987,904         --              --             --            --
Issuance of
Series D
preferred stock,
net of $45,632
in issuance
costs...........   4,969,148     497         --     --    4,334,300         --              --             --            --
Issuance of
Series E
preferred stock,
net of $16,609
in issuance
costs...........  18,082,200   1,808         --     --   16,481,592         --              --             --            --
Deferred stock
compensation....         --      --          --     --    8,432,317         --              --      (8,432,317)          --
Amortization of
deferred stock
compensation....         --      --          --     --          --          --              --       3,310,368           --
Net loss........         --      --          --     --          --          --              --             --     (8,852,168)
                  ----------  ------  ---------- ------ -----------   ---------      ----------    -----------   -----------
Balances as of
December 31,
1998............  50,580,190  $5,058  18,001,248 $1,800 $34,955,432   $(122,585)     $      --     $(5,223,575)  $(9,051,224)
                  ==========  ======  ========== ====== ===========   =========      ==========    ===========   ===========
<CAPTION>
                      Total
                  stockholders'
                    (deficit)
                     equity
                  -------------
<S>               <C>
Balances as of
October 20, 1997
(inception).....   $       --
Issuance of
common stock....        24,716
Deferred stock
compensation....           --
Amortization of
deferred stock
compensation....        89,249
Issuance of
Series A
preferred stock.           --
Net loss........      (199,056)
                  -------------
Balances as of
December 31,
1997............       (85,091)
Issuance of
common stock for
notes
receivable......           --
Exercise of
stock purchase
rights for cash.        27,387
Exercise of
options for
cash............         7,166
Contribution of
property and
equipment by
common
stockholder.....       142,067
Exchange of
Series A
preferred stock
for Series B
preferred stock.           --
Issuance of
Series B
preferred stock,
net of $50,058
in issuance
costs...........     4,208,803
Repurchase and
cancellation of
Series B
preferred stock.    (1,000,000)
Issuance of
Series C
preferred stock,
net of $61,823
in issuance
costs...........     1,988,177
Issuance of
Series D
preferred stock,
net of $45,632
in issuance
costs...........     4,334,797
Issuance of
Series E
preferred stock,
net of $16,609
in issuance
costs...........    16,483,400
Deferred stock
compensation....           --
Amortization of
deferred stock
compensation....     3,310,368
Net loss........    (8,852,168)
                  -------------
Balances as of
December 31,
1998............   $20,564,906
                  =============
</TABLE>

         See accompanying notes to consolidated financial statements.

                                      F-6
<PAGE>

                               ONI SYSTEMS CORP

    CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY--(Continued)
 Period from October 20, 1997 (inception) to December 31, 1997 and years ended
                        December 31, 1998 and 1999 and
              (unaudited) three month period ended March 31, 2000

<TABLE>
<CAPTION>
                     Convertible                                      Notes
                   preferred stock    Common stock     Additional   receivable       Services       Deferred
                  ----------------- -----------------   paid-in        from         receivable       stock      Accumulated
                    Shares   Amount   Shares   Amount   capital    stockholders  from stockholder compensation    deficit
                  ---------- ------ ---------- ------ ------------ ------------  ---------------- ------------  ------------
<S>               <C>        <C>    <C>        <C>    <C>          <C>           <C>              <C>           <C>
Exercise of
options for
cash............         --  $  --   3,023,220 $  302 $    271,997 $       --       $     --      $        --   $        --
Issuance of
Series E
preferred stock,
net of $37,471
in issuance
costs...........   8,001,824    800        --     --     7,263,393         --             --               --            --
Issuance of
Series E
preferred stock
in exchange for
services........     200,000     20        --     --       182,480         --        (182,500)             --            --
Performance of
services........         --     --         --     --           --          --          97,336              --            --
Issuance of
common stock for
acquisition of
Object-Mart.....         --     --   4,569,276    457    5,874,220         --             --               --            --
Issuance of
Series F
preferred stock,
net of $20,607
in issuance
costs...........   8,249,468    825        --     --    14,968,576         --             --               --            --
Exercise of
options for
notes
receivable......         --     --   5,685,846    569    3,712,925  (3,713,494)           --               --            --
Payment on
stockholder
notes...........         --     --         --     --           --       12,000            --               --            --
Issuance of
warrants in
connection with
debt financing..         --     --         --     --       203,581         --             --               --            --
Issuance of
Series G
preferred stock,
net of $44,668
in issuance
costs...........  11,824,418  1,182        --     --    74,654,512         --             --               --            --
Issuance of
warrants in
connection with
purchase and
license
agreement.......         --     --         --     --     2,890,500         --             --               --            --
Stock-based
compensation to
non-employees...         --     --         --     --        73,065         --             --               --            --
Deferred stock
compensation....         --     --         --     --    41,730,329         --             --       (41,730,329)          --
Amortization of
deferred stock
compensation....         --     --         --     --           --          --             --        11,421,739           --
Net loss........         --     --         --     --           --          --             --               --    (46,571,571)
                  ---------- ------ ---------- ------ ------------ -----------      ---------     ------------  ------------
Balances as of
December 31,
1999............  78,855,900 $7,885 31,279,590 $3,128 $186,781,010 $(3,824,079)     $ (85,164)    $(35,532,165) $(55,622,795)
                  ========== ====== ========== ====== ============ ===========      =========     ============  ============
<CAPTION>
                      Total
                  stockholders'
                    (deficit)
                     equity
                  --------------
<S>               <C>
Exercise of
options for
cash............  $    272,299
Issuance of
Series E
preferred stock,
net of $37,471
in issuance
costs...........     7,264,193
Issuance of
Series E
preferred stock
in exchange for
services........           --
Performance of
services........        97,336
Issuance of
common stock for
acquisition of
Object-Mart.....     5,874,677
Issuance of
Series F
preferred stock,
net of $20,607
in issuance
costs...........    14,969,401
Exercise of
options for
notes
receivable......           --
Payment on
stockholder
notes...........        12,000
Issuance of
warrants in
connection with
debt financing..       203,581
Issuance of
Series G
preferred stock,
net of $44,668
in issuance
costs...........    74,655,694
Issuance of
warrants in
connection with
purchase and
license
agreement.......     2,890,500
Stock-based
compensation to
non-employees...        73,065
Deferred stock
compensation....           --
Amortization of
deferred stock
compensation....    11,421,739
Net loss........   (46,571,571)
                  --------------
Balances as of
December 31,
1999............  $ 91,727,820
                  ==============
</TABLE>

         See accompanying notes to consolidated financial statements.

                                      F-7
<PAGE>

                               ONI SYSTEMS CORP

    CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY--(Continued)
 Period from October 20, 1997 (inception) to December 31, 1997 and years ended
                        December 31, 1998 and 1999 and
              (unaudited) three month period ended March 31, 2000

<TABLE>
<CAPTION>
                     Convertible                                      Notes
                   preferred stock    Common stock     Additional   receivable       Services       Deferred
                  ----------------- -----------------   paid-in        from         receivable       stock      Accumulated
                    Shares   Amount   Shares   Amount   capital    stockholders  from stockholder compensation    deficit
                  ---------- ------ ---------- ------ ------------ ------------  ---------------- ------------  ------------
<S>               <C>        <C>    <C>        <C>    <C>          <C>           <C>              <C>           <C>
Exercise of
options for cash
(unaudited).....         --  $  --   1,488,283 $  149 $    783,003 $       --        $    --      $        --   $        --
Exercise of
options for
notes receivable
(unaudited).....         --     --   2,162,000    216    4,605,226  (4,605,442)           --               --            --
Issuance of
common shares in
exchange for
services
(unaudited).....         --     --      14,002      1       17,502         --             --               --            --
Issuance of
Series G shares,
net of $8,207 in
issuance costs
(unaudited).....     310,000     31        --     --     4,341,470         --             --        (2,380,800)          --
Issuance of
Series G shares
in exchange for
services
(unaudited).....      29,000      3        --     --       405,987         --             --          (222,720)          --
Amortization of
cost of
preferred stock
issued for
leased facility
(unaudited).....         --     --         --     --           --          --          36,501              --            --
Issuance of
warrants in
connection with
purchase and
license
agreement
(unaudited).....         --     --         --     --     3,000,242         --             --               --            --
Issuance of
warrants in
exchange for
services
(unaudited).....         --     --         --     --     1,544,600         --             --               --            --
Deferred stock
compensation
(unaudited).....         --     --         --     --    66,696,890         --             --       (66,696,890)          --
Amortization of
deferred stock
compensation
(unaudited).....         --     --         --     --           --          --             --        13,612,293           --
Net loss
(unaudited).....         --     --         --     --           --          --             --               --    (34,167,291)
                  ---------- ------ ---------- ------ ------------ -----------       --------     ------------  ------------
Balance at March
31, 2000
(unaudited).....  79,194,900 $7,919 34,943,875 $3,494 $268,175,930 $(8,429,521)      $(48,663)    $(91,220,282) $(89,790,086)
                  ========== ====== ========== ====== ============ ===========       ========     ============  ============
<CAPTION>
                      Total
                  stockholders'
                    (deficit)
                     equity
                  --------------
<S>               <C>
Exercise of
options for cash
(unaudited).....  $    783,152
Exercise of
options for
notes receivable
(unaudited).....           --
Issuance of
common shares in
exchange for
services
(unaudited).....        17,503
Issuance of
Series G shares,
net of $8,207 in
issuance costs
(unaudited).....     1,960,701
Issuance of
Series G shares
in exchange for
services
(unaudited).....       183,270
Amortization of
cost of
preferred stock
issued for
leased facility
(unaudited).....        36,501
Issuance of
warrants in
connection with
purchase and
license
agreement
(unaudited).....     3,000,242
Issuance of
warrants in
exchange for
services
(unaudited).....     1,544,600
Deferred stock
compensation
(unaudited).....           --
Amortization of
deferred stock
compensation
(unaudited).....    13,612,293
Net loss
(unaudited).....   (34,167,291)
                  --------------
Balance at March
31, 2000
(unaudited).....  $ 78,698,791
                  ==============
</TABLE>

         See accompanying notes to consolidated financial statements.

                                      F-8
<PAGE>

                               ONI SYSTEMS CORP.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

         Period from October 20, 1997 (inception) to December 31, 1997
                   and years ended December 31, 1998 and 1999

(1) Description of Business and Significant Accounting Policies

 (a) Description of Business

   ONI Systems Corp. (ONI) develops, markets and sells optical communications
equipment to networking and internet service providers in the regional and
metropolitan area markets.

   ONI was incorporated in California, as Optical Networks, Incorporated, on
October 20, 1997, and through November 1999, was considered to be in the
development stage, principally engaged in research and development, raising
capital and building its management team. ONI recognized its first commercial
sale in the fourth quarter of 1999 with the licensing of its network operating
system. Historically, ONI also recognized revenue derived from contracts with
agencies of the United States government. These contracts were completed in
June 1999. ONI changed its name to ONI Systems Corp. in April 2000.

 (b) Principles of Consolidation

   The accompanying consolidated financial statements include the financial
statements of ONI and its wholly-owned subsidiaries. All significant
intercompany balances and transactions have been eliminated on consolidation.

 (c) Stock Splits

   Share information for all periods has been retroactively adjusted to reflect
a one-for-three reverse split of common stock effected in March 1998, a two-
for-three reverse split of Series B and Series C preferred stock effected in
August 1999, a two-for-one split of common stock, Series D and Series E
preferred stock effected in August 1999 and a two-for-one common and preferred
stock split effected in February 2000.

 (d) Use of Estimates

   The preparation of consolidated financial statements in conformity with
generally accepted accounting principles requires ONI to make estimates and
assumptions that affect the reported amounts of assets, liabilities, revenue
and expenses, and to disclose contingent assets and liabilities at the date of
the consolidated financial statements and the reported results of operations
during the reporting period. Actual results could differ from those estimates.

 (e) Cash and Cash Equivalents

   ONI considers all highly liquid investments with remaining maturities of
three months or less at the date of purchase to be cash equivalents. As of
December 31, 1998 and 1999 and March 31, 2000, cash equivalents totaled
$19,091,688, $79,004,976 and $48,235,327, respectively. Cash equivalents
consisted primarily of money market funds.

 (f) Inventory

   Inventories are stated at the lower of average cost or market.

 (g) Property and Equipment

   Property and equipment are stated at cost and are depreciated using the
straight-line method over the estimated useful lives of the related assets,
ranging from one to five years. Leasehold

                                      F-9
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

improvements and assets recorded under capital leases are amortized on a
straight-line basis over the lesser of the related asset's estimated useful
life or the remaining lease term.

 (h) Intangibles

   ONI has capitalized the cost of identifiable intangibles associated with the
acquisition of Object-Mart, Inc. These intangibles are amortized over their
estimated useful lives, not exceeding two years.

 (i) Research and Development Costs

   ONI's products are technical in nature and require a significant and
continuing research and development effort. All research and development costs
are expensed as incurred. Statement of Financial Accounting Standards (SFAS)
No. 86, Accounting for the Costs of Computer Software to Be Sold, Leased, or
Otherwise Marketed, requires the capitalization of certain software development
costs incurred subsequent to the date technological feasibility is established
and prior to the date the product is generally available for sale. The
capitalized cost is then amortized over the estimated life of the product. To
date, ONI has not capitalized any software development costs because
capitalizable costs meeting the requirements of SFAS No. 86 have not been
significant.

 (j) Revenue Recognition

   ONI recognizes revenue from product sales upon shipment, assuming
collectibility of the resulting receivable is probable. When the arrangement
with the customer includes future obligations or obtaining customer acceptance,
revenue is recognized when those obligations have been met or customer
acceptance has been received.

   ONI sells licenses for embedded software and application software. Revenue
from transactions involving ONI's software products is accounted for in
accordance with Statement of Position (SOP) 97-2, Software Revenue Recognition,
SOP 98-4, Deferral of Effective Date of SOP 97-2, and SOP 98-9, Software
Revenue Recognition with Respect to Certain Arrangements. Accordingly, ONI
recognizes revenue from licenses of software products provided that a purchase
order has been received, the software and related documentation have been
shipped, collection of the resulting receivable is deemed probable, and the fee
is fixed or determinable.

   Services revenue consists primarily of training and installation services.
Revenues from training and installation services are recognized as the services
are performed. To date, ONI has not been obligated to provide installation
services to its customers and service revenue has not been significant.

   Deferred revenue represents amounts billed in excess of revenue recognized.

   In 1998 and 1999 ONI derived most of its revenue from contracts with
agencies of the United States government. These contracts include cost-plus and
fixed price contracts, and revenue is recorded as earned as defined within the
specific agreements. Revenue from cost-plus contracts is billed and recognized
at the time the costs are incurred. Revenue for fixed price contracts is
recognized when milestones are completed and product or reports, if any,
committed for the milestones are shipped, which approximates the percentage-of-
completion method. Amounts designated as withholdings are not recognized until
completion of the contract.

 (k) Warranty Reserves

   ONI provides a limited warranty for its products. Estimated expenses for
warranty obligations are recorded at the time revenue is recognized.

                                      F-10
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


 (l) Income Taxes

   ONI utilizes the asset and liability method of accounting for income taxes.
Deferred tax assets and liabilities are recognized for the estimated future tax
consequences attributable to differences between the financial statement
carrying amounts of existing assets and liabilities and their respective tax
bases. Deferred tax assets and liabilities are measured using enacted tax rates
expected to apply to taxable income in the years in which those temporary
differences are expected to be recovered or settled. Valuation allowances are
established when necessary to reduce deferred tax assets to the amounts
expected to be realized.

 (m) Fair Value of Financial Instruments

   The fair value of ONI's cash and cash equivalents, accounts receivable,
prepaid expenses and other current assets, accounts payable and accrued
liabilities approximates their carrying values due to the short-term nature of
those instruments.

   The fair value of short-term and long-term capital lease obligations is
estimated based on current interest rates available to ONI for debt instruments
with similar terms, degrees of risk and remaining maturities. The carrying
values of these obligations approximate their respective fair values.

 (n) Concentration of Risk

   Financial instruments, that potentially subject ONI to concentrations of
credit risk, consist primarily of cash and cash equivalents and accounts
receivable. ONI's cash and cash equivalents are maintained with a highly
accredited financial institution. In 1998, accounts receivable were due from
agencies of the United States government, resulting in minimal collection
risks. For the year ended December 31, 1999, there were two customers that
represented 46% and 26% of total revenue.

   In 2000, ONI's revenue has primarily been derived from the sale of one
product, the ONLINE9000. For the three month period ended March 31, 2000, four
customers accounted for 33%, 30%, 23% and 14% of revenue and 32%, 32%, 22% and
14% of accounts receivable. For the three month period ended March 31, 2000,
export sales to Europe, which were denominated in United States Dollars,
accounted for 30% of total revenue.

 (o) Stock-Based Compensation

   ONI accounts for stock-based awards to employees using the intrinsic value
method. Expense associated with stock-based compensation is being amortized on
an accelerated basis over the vesting period of the individual award consistent
with the method described in Financial Accounting Standards Board (FASB)
Interpretation No. 28. Accordingly, approximately 59% of the unearned deferred
compensation is amortized in the first year, 25% in the second year, 12% in the
third year, and 4% in the fourth year following the date of the grant. Pursuant
to SFAS No. 123, Accounting for Stock-Based Compensation, ONI discloses the
pro-forma effect of using the fair value method of accounting for employee
stock-based compensation arrangements.

   For non-employees, ONI computes the fair value of stock-based compensation
in accordance with SFAS No. 123 and Emerging Issues Task Force (EITF) 96-18,
Accounting for Equity Instruments that are Issued to Other Than Employees for
Acquiring, or in Conjunction with Selling, Goods or Services.

                                      F-11
<PAGE>

                               ONI SYSTEMS, CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


 (p) Impairment of Long-Lived Assets

   ONI evaluates its long-lived assets, including certain intangibles, for
impairment whenever events or changes in circumstances indicate that the
carrying value of an asset may not be recoverable. Recoverability of assets to
be held and used is measured by a comparison of the carrying amount of an asset
to future net cash flows (undiscounted and without interest charges) expected
to be generated by the asset. If these assets are considered to be impaired,
the impairment to be recognized is measured by the amount by which the carrying
amount of the assets exceeds the fair value of the assets.

 (q) Comprehensive Loss

   Other comprehensive income refers to revenues, expenses, gains and losses
that are not included in net income, but rather are recorded directly in
stockholders' (deficit) equity. To date, ONI has no items of other
comprehensive loss and, accordingly, comprehensive loss is the same as net
loss.

 (r) Initial Public Offering and Unaudited Pro Forma Balance Sheet

   In February 2000, the Board of Directors authorized the filing of a
registration statement with the Securities and Exchange Commission that would
permit ONI to sell shares of ONI's common stock in connection with a proposed
initial public offering (IPO). If the offering is consummated under the terms
presently anticipated, all of the outstanding shares of ONI's convertible
preferred stock will automatically convert into shares of common stock upon the
closing of the IPO. The conversion of the convertible preferred stock has been
reflected in the accompanying unaudited pro forma consolidated balance sheet.

   Pro forma basic and diluted net loss per share data assuming conversion of
the shares of Series B, C, D, E, F and G preferred stock into shares of common
stock had occurred at the beginning of the period (or date of issuance if
later) are as follows:

<TABLE>
<CAPTION>
                                                                  Three months
                                                     Year ended      ended
                                                    December 31,   March 31,
                                                    ------------  ------------
                                                        1999          2000
                                                    ------------  ------------
<S>                                                 <C>           <C>
Pro forma net loss................................. $(46,571,571) $(34,167,291)
Pro forma basic and diluted net loss per share..... $      (0.60) $      (0.33)
Shares used in computing pro forma basic and
 diluted net loss per share........................   78,025,225   103,153,985
</TABLE>

 (s) Net Loss Per Share

   Basic net loss per share is computed using the weighted-average number of
common shares outstanding during the period. Diluted net loss per share is
computed using the weighted-average number of common shares and dilutive
potential common shares outstanding during the period, using the as-if-
converted method for convertible preferred shares and the treasury stock method
for options and warrants. All potential shares have been excluded from the
computation of diluted net loss per share for all periods presented because the
effect would be antidilutive. Pursuant to SEC Staff Accounting Bulletin No. 98,
common shares and convertible preferred shares issued for nominal consideration
and options and warrants granted for nominal consideration prior to the
anticipated effective date of the initial public offering are included in the
calculation of basic and diluted net loss

                                      F-12
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

per share as if they were outstanding for all periods presented. To date, ONI
has not had any issuances of stock, options or warrants for nominal
consideration. Diluted net loss per share does not include the effects of the
following potential common shares:

<TABLE>
<CAPTION>
                              Period from
                               October 20    Year ended December   Three months ended
                             (inception) to          31,                March 31,
                              December 31,  --------------------- ---------------------
                                  1997         1998       1999       1999       2000
                             -------------- ---------- ---------- ---------- ----------
                                                                       (unaudited)
   <S>                       <C>            <C>        <C>        <C>        <C>
   Shares issuable under
    stock options..........    1,078,220     8,789,776 17,548,724 11,161,028 19,343,345
   Shares of unvested stock
    subject to repurchase..          --      5,992,684  8,587,699  4,842,165 10,096,468
   Shares issuable pursuant
    to warrants to purchase
    common stock...........      233,468       233,468    733,468    233,468  1,156,468
   Shares issuable pursuant
    to warrants to purchase
    convertible preferred
    stock..................          --            --     277,926    277,926    277,926
   Shares issuable related
    to convertible
    preferred stock on an
    "as-if-converted"
    basis..................    8,000,000    50,580,190 78,855,900 58,582,014 79,194,900
</TABLE>

   The weighted-average exercise price of stock options outstanding was $0.005,
$0.08, $0.29 and $0.64 as of December 31, 1997, 1998, 1999 and March 31, 2000
respectively. The weighted-average purchase price of shares of common stock
subject to the Company's right of repurchase was $0.02, $0.44 and $0.87 as of
December 31, 1998, 1999 and March 31, 2000, respectively. The exercise price of
warrants to purchase shares of convertible preferred stock remained $0.88 as of
December 31, 1999 and March 31, 2000. The weighted-average exercise price of
warrants to purchase shares of common stock was $0.62 and $3.16 as of December
31, 1999 and March 31, 2000, respectively. Each share of preferred stock is
convertible into one share of common stock.

 (t) Segment Reporting

   ONI adopted SFAS No. 131, DIsclosures About Segments of an Enterprise and
Related Information, for the year ended December 31, 1999. SFAS No. 131
establishes standards for the manner in which public companies report
information about operating segments in annual and interim financial
statements. It also establishes standards for related disclosures about
products and services, geographic areas and major customers. The method for
determining what information to report is based on the way management organizes
the operating segments within a company for making operating decisions and
assessing financial performances.

   ONI's chief executive officer (CEO) is its chief operating decision-maker.
The financial information that the CEO reviews is identical to the information
presented in the accompanying

                                      F-13
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

statements of operations. ONI has determined that it operates in a single
operating segment: development and sale of optical networking equipment to
communications service providers in the regional and metropolitan area markets.

   Through December 31, 1999, ONI's revenue was primarily from government
research and development contracts. These contracts were completed in June
1999, and they will not contribute to ONI's revenue in the future as ONI will
not continue these activities.

   Beginning January 1, 2000, ONI's revenue has been derived from sales of its
ONLINE9000 product. ONI expects to continue selling the ONLINE9000 in the
future, and also to develop other lines of products for sale.

 (u) Recent Accounting Pronouncements

   In June 1998, the FASB issued SFAS No. 133, Accounting for Derivative
Instruments and Hedging Activities. SFAS No. 133 establishes accounting and
reporting standards for derivative financial instruments and hedging activities
related to those instruments, as well as other hedging activities. Because ONI
does not currently hold any derivative instruments and does not engage in
hedging activities, ONI expects that the adoption of SFAS No. 133 will not have
a material impact on its financial position, results of operations or cash
flows. ONI will be required to adopt SFAS No. 133 for the year ended December
31, 2001 in accordance with SFAS No. 137, which delayed implementation of SFAS
No. 133.

   In December 1999, the Securities and Exchange Commission issued Staff
Accounting Bulletin No. 101 (SAB No. 101), which summarizes views of the
Commission staff in applying generally accepted accounting principles to
revenue recognition in financial statements. ONI believes that its current
revenue recognition principles comply with this bulletin.

(2) Business Combination

   On June 29, 1999, ONI acquired all of the outstanding common shares of
Object-Mart, Inc. (Object-Mart) in exchange for 4,569,276 shares of ONI's
common stock and approximately $3,222,000 in cash for a total purchase price of
approximately $9,096,677. Object-Mart was located in San Jose, California, and
provided software products and services to software development companies,
software providers and equipment manufacturers in the telecommunications
industry. The combination was accounted for using the purchase method and,
accordingly, the results of operations of Object-Mart have been included in
ONI's consolidated financial statements only since June 29, 1999. The excess of
the purchase price over the fair value of the net identifiable assets acquired
of $5,679,839 has been recorded as goodwill and is being amortized on a
straight-line basis over two years. Identifiable intangibles are amortized on a
straight-line basis over periods not exceeding two years.

   The amount of $170,000 allocated to purchased in-process research and
development was determined through established valuation techniques in the
high-technology communications industry and was expensed upon acquisition
because technological feasibility had not been established and no future
alternative uses existed.

   The following unaudited pro forma financial information presents the
combined results of operations of ONI and Object-Mart as if the acquisition had
occurred as of the beginning of 1998 and 1999, after giving effect to certain
adjustments, including amortization of goodwill and other

                                      F-14
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

intangibles, additional depreciation expense and related income tax effects.
The pro forma financial information does not necessarily reflect the results of
operations that would have occurred had ONI and Object-Mart constituted a
single entity during these periods.

<TABLE>
<CAPTION>
                                                     Year ended December 31,
                                                    --------------------------
                                                        1998          1999
                                                    ------------  ------------
                                                           (unaudited)
   <S>                                              <C>           <C>
   Revenue......................................... $  3,665,811  $  4,625,795
   Net loss........................................ $(11,172,005) $(47,779,504)
   Basic and diluted net loss per share............ $      (0.94) $      (2.65)
</TABLE>

(3) Inventories

   Inventories consist of:

<TABLE>
<CAPTION>
                                                        December 31,  March 31,
                                                            1999        2000
                                                        ------------ -----------
                                                                     (unaudited)
   <S>                                                  <C>          <C>
   Raw materials.......................................  $8,914,321  $ 7,924,748
   Work in progress....................................          --    8,801,088
   Finished goods......................................     734,535    3,154,445
   Consignment inventory...............................          --      903,493
                                                         ----------  -----------
                                                         $9,648,856  $20,783,774
                                                         ==========  ===========
</TABLE>

(4) Property and Equipment

   Property and equipment is as follows:

<TABLE>
<CAPTION>
                                                  December 31,       March 31,
                                              --------------------- -----------
                                                 1998       1999       2000
                                              ---------- ---------- -----------
                                                                    (unaudited)
   <S>                                        <C>        <C>        <C>
   Computers and equipment................... $1,050,541 $5,569,889 $16,424,038
   Furniture and fixtures....................    204,734    714,592   1,032,043
   Leasehold improvements....................     50,688    273,663     412,554
                                              ---------- ---------- -----------
                                               1,305,963  6,558,144  17,868,635
   Less accumulated depreciation and
    amortization.............................    289,265  1,243,154   2,072,568
                                              ---------- ---------- -----------
                                              $1,016,698 $5,314,990 $15,796,067
                                              ========== ========== ===========
</TABLE>

   Equipment recorded under capital leases was $132,975, $541,580 and $439,571
as of December 31, 1998, 1999 and March 31, 2000, respectively, and the related
accumulated amortization was $13,651, $57,976 and $102,009 as of December 31,
1998, 1999 and March 31, 2000, respectively. There was no equipment recorded
under capital leases as of December 31, 1997.

                                      F-15
<PAGE>

                               ONI SYSTEMS, CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


(5) Intangibles

   A summary of intangibles is as follows:

<TABLE>
<CAPTION>
                                                        December 31,  March 31,
                                                            1999        2000
                                                        ------------ -----------
                                                                     (unaudited)
   <S>                                                  <C>          <C>
   Purchased technology and workforce..................  $  530,000  $  530,000
   Assembled workforce and non-compete agreements......     630,000     630,000
                                                         ----------  ----------
                                                          1,160,000   1,160,000
   Less accumulated amortization.......................     422,500     633,750
                                                         ----------  ----------
                                                         $  737,500  $  526,250
                                                         ==========  ==========
</TABLE>

(6) Accrued Liabilities

   Accrued liabilities are comprised of the following:

<TABLE>
<CAPTION>
                                                       December 31,  March 31,
                                                           1999        2000
                                                       ------------ -----------
                                                                    (unaudited)
   <S>                                                 <C>          <C>
   Accrued Employee benefits..........................  $  671,155  $ 1,364,760
   Uninvoiced receipts................................   4,307,740    7,443,179
   Other..............................................   1,107,889    1,762,374
                                                        ----------  -----------
                                                        $6,086,784  $10,570,313
                                                        ==========  ===========
</TABLE>

(7) Related Party Transactions

   On October 20, 1997, ONI was incorporated as a wholly-owned subsidiary of
Optivision, Inc. (Optivision) and in connection therewith issued 11,565,752
shares of common stock, 8,000,000 shares of Series A preferred stock and a
$90,000 promissory note to Optivision in exchange for cash of $100,000,
property and equipment of $14,716, and certain intellectual property and
technology rights. On December 22, 1997, ONI was spun-out from Optivision. In
conjunction with the spin-out, ONI reserved 233,468 shares of common stock
issuable to a third party holding warrants to purchase common shares of
Optivision. In January 1998, a further $142,067 of property and equipment was
provided by Optivision to ONI for no additional consideration.

   In 1998, in conjunction with the issuance of the Series B and Series C
preferred stock, 8,000,000 shares of Series A preferred stock were converted to
Series B preferred stock, and the Company repurchased and canceled 1,333,333
shares of Series B preferred stock from Optivision in exchange for $1,000,000
in cash.

   During 1998 and 1999, ONI received $122,585 and $3,713,494, respectively, in
promissory notes from certain officers in exchange for common stock. As of
December 31, 1999, $12,000 had been repaid by the stockholders. The notes are
repayable over a period of five to ten years and bear interest at rates ranging
from 4.46% to 6.20%. The notes are secured by the underlying common shares. In
the three month period ended March 31, 2000, ONI received an additional
$4,605,442 in promissory notes in exchange for common stock.

(8) Financing Arrangements

   In February 1999, ONI entered into a Loan and Security Agreement with a
financing company that allowed ONI to borrow up to $2,000,000. The loan bears
interest at the prime rate, is repayable

                                      F-16
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

in 36 equal monthly installments of principal and interest and is secured by
certain assets of ONI. ONI also entered into a Subordinated Loan and Security
Agreement with the same financing company, which allowed ONI to borrow up to
$1,000,000. The subordinated loan bears interest at 12% per annum, is repayable
in 36 equal monthly installments of principal and interest and is secured by
certain assets of ONI. As of December 31, 1999, ONI had not borrowed any
amounts under these agreements. These agreements expired unutilized on February
10, 2000.

   In connection with the loan and security agreement and subordinated loan and
security agreement, ONI issued warrants to purchase 90,750 and 119,116 shares
of Series B convertible preferred stock, respectively, at $0.88 per share. The
warrants expire on the earlier of February 10, 2009, or five years from the
effectiveness of ONI's initial public offering. No warrants had been exercised
as of December 31, 1999. The fair value of the warrants was determined to be
$66,474 and $87,252, respectively, calculated using the Black-Scholes option
pricing model, using the following assumptions: no dividends; contractual term
of ten years; risk-free interest rate of 5.5%; and expected volatility of 70%.
The fair value of the warrants has been recorded as additional capital and was
amortized to interest expense over the term of the loan agreements.

(9) Stockholders' Equity

 (a) Preferred Stock

   As of December 31, 1999, ONI had 80,309,408 shares of preferred stock
authorized. ONI has designated and issued preferred stock as follows:

<TABLE>
<CAPTION>
                                                      December 31,
                                    ------------------------------------------------      March 31, 2000
                                             1998                     1999                 (unaudited)
                            1999    ----------------------- ------------------------ ------------------------
                         Designated   Shares    Liquidation   Shares    Liquidation    Shares    Liquidation
                           shares   outstanding preference  outstanding  preference  outstanding  preference
                         ---------- ----------- ----------- ----------- ------------ ----------- ------------
<S>                      <C>        <C>         <C>         <C>         <C>          <C>         <C>
Series B................ 25,073,436 24,795,510  $ 5,840,181 24,795,510  $  5,840,181 24,795,510  $  5,840,181
Series C................  2,733,332  2,733,332    2,049,999  2,733,332     2,049,999  2,733,332     2,049,999
Series D................  4,969,148  4,969,148    4,380,428  4,969,148     4,380,428  4,969,148     4,380,428
Series E................ 26,284,024 18,082,200   16,500,008 26,284,024    23,984,172 26,284,024    23,984,172
Series F................  8,249,468        --           --   8,249,468    15,000,008  8,249,468    15,000,008
Series G................ 13,000,000        --           --  11,824,418    74,700,723 12,163,418    76,872,802
                         ---------- ----------  ----------- ----------  ------------ ----------  ------------
                         80,309,408 50,580,190  $28,770,616 78,855,900  $125,955,511 79,194,900  $128,127,590
                         ========== ==========  =========== ==========  ============ ==========  ============
</TABLE>

   In January 1998, ONI raised $4,208,803, net of issuance costs of $50,058,
through the sale of 18,128,843 shares of Series B preferred stock for cash of
$0.24 per share. In addition, ONI issued 8,000,000 shares of Series B preferred
stock in exchange for the redemption and cancellation of 8,000,000 shares of
Series A preferred stock and repurchased 1,333,333 shares of Series B preferred
stock for cash consideration of $1,000,000. Concurrently, ONI raised
$1,988,177, net of issuance costs of $61,823, from the sale of 2,733,332 shares
of Series C preferred stock for cash of $0.75 per share.

   In April 1998, ONI raised $4,334,797, net of issuance costs of $45,632, from
the sale of 4,969,148 shares of Series D preferred stock for cash of $0.88 per
share.

   In December 1998, ONI raised $16,483,400, net of issuance costs of $16,609,
from the sale of 18,082,200 shares of Series E preferred stock for cash of
$0.91 per share. In March 1999, ONI closed a second round of Series E preferred
financing, raising $7,264,193, net of issuance costs of

                                      F-17
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

$37,471, from the sale of 8,001,824 shares of Series E preferred stock. In
addition ONI issued 200,000 shares of Series E preferred stock in exchange for
additional lease space at its 166 Baypointe Parkway location. The value of
$182,500 ascribed to the Series E preferred stock was recorded as a reduction
of stockholders' equity and is being amortized to rent expense over the period
of the lease agreement.

   In September 1999, ONI raised $14,969,401, net of issuance costs of $20,607,
from the sale of 8,249,468 shares of Series F preferred stock for cash of $1.82
per share.

   In December 1999, ONI completed another round of private financing, raising
$74,655,694, net of issuance costs of $44,668, from the sale of 11,824,418
shares of Series G preferred stock for cash of $6.32 per share. In March 2000,
ONI raised an additional $1,960,701, net of issuance costs of $8,207, from the
sale of 310,000 shares of Series G preferred stock for cash of $6.32 per share.
In addition 29,000 shares of Series G preferred stock were issued in exchange
for services. The value of $183,270 ascribed to these services has been
expensed in the period ended March 31, 2000 in accordance with EITF 96-18. The
Series G preferred stock issued in March was issued to an employee, a director
and consultants as consideration for both services previously rendered as well
as for services to be rendered in the future. ONI has recorded deferred stock
compensation of $2,603,520, for the three months ended March 31, 2000, for the
difference between the purchase price of the shares and the fair market value
of the shares of $14.00 per share. This amount is being amortized on an
accelerated basis over the vesting period, or the period in which the services
were rendered if shorter, consistent with the method described in FASB
Interpretation No. 28. Amortization of deferred stock compensation associated
with these shares was $585,094 for the three months ended March 31, 2000.

   The rights, preferences and restrictions of the Series B, C, D, E, F and G
preferred stock are as follows:

  . Each share of Series B, C, D, E, F and G preferred stock is convertible
    at the option of the holder at any time after the date of issuance on a
    one-for-one basis subject to certain antidilution provisions. Conversion
    of all Series B, C, D, E, F and G preferred stock is automatic upon the
    earlier of (1) the closing of a firm underwritten commitment with respect
    to an initial public offering of shares of common stock of ONI, in which
    ONI receives cash proceeds of at least $20,000,000 (net of underwriters'
    commissions and expenses) or (2) the written consent of the holders of 66
    -2/3% of the outstanding shares of preferred stock, voting together as a
    single class.

  . Holders of Series B, C, D, E, F and G preferred stock are entitled to
    receive dividends equal to 10% of their respective liquidation preference
    in preference to any dividend on common stock when, as and if declared by
    the Board of Directors out of legally available funds. These preferential
    dividends are noncumulative. In addition, the holders of Series B, C, D,
    E, F and G preferred stock are entitled to receive dividends on a basis
    equal to common stockholders out of funds legally available therefor,
    when, as and if declared by the Board of Directors. No dividends have
    been declared through December 31, 1999.

  . Series B, C, D, E, F and G preferred stock have liquidation preferences
    of $0.24, $0.75, $0.88, $0.91, $1.82 and $6.32, respectively, plus all
    declared but unpaid dividends on such shares.

  . Series B, C, D, E, F and G preferred stock have the same voting rights as
    the number of shares of common stock issuable upon conversion of such
    shares. Four directors are elected by the holders of record of the Series
    B, C and E preferred stock voting as a separate class; one director is
    elected by the holders of record of the common stock voting as a separate
    class; and two directors are elected by the holders of record of the
    Series B, C, D, E, F and G preferred stock and common stock voting
    together as a single class.


                                      F-18
<PAGE>

                               ONI SYSTEMS, CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

 (b) Common Stock

   As of December 31, 1999, ONI had 159,690,592 shares of common stock
authorized.

   In 1998, ONI issued 6,431,496 shares of restricted common stock at prices
ranging from $0.0016 to $0.0882 per share, 5,991,496 of which were issued in
exchange for notes receivable of $122,585. In 1999, ONI issued an additional
513,332 shares of restricted common stock at prices ranging from $0.09 to
$0.91, 20,000 of which were issued in exchange for notes receivable of $18,200.
In the three month period ended March 31, 2000, ONI issued 2,162,000 shares of
restricted common stock at prices ranging from $0.09 to $3.20, all of which
were issued in exchange for notes receivable of $4,605,442. The restricted
shares of common stock vest 25% within 12 months of issuance with the remainder
vesting in 36 equal monthly amounts. On the occurrence of a change in control
event, as defined, 50% of the unvested shares of common stock becomes vested.
Upon termination of employment, ONI may repurchase all unvested shares at an
amount equal to the original purchase price.

   ONI maintains a right of first refusal with respect to restricted common
stock. A stockholder must notify ONI prior to selling these shares to a third
party. Upon notification, ONI may purchase the shares from the holder at the
price offered by the third party.

   In December 1999, in connection with the signing of a Purchase and License
Agreement with a customer to provide certain ONI products in the future, ONI
issued a warrant to purchase 500,000 shares of common stock at an exercise
price of $0.91 per share. The value of $2,890,500 ascribed to the warrant was
estimated using the Black-Scholes option valuation model with the following
assumptions: no expected dividend yield; risk free interest rate of 5.50%;
expected volatility of 70%; and contractual term of six years. The warrant was
nonforfeitable when issued, and becomes exercisable on the ratio of the dollar
volume of purchases of ONI's products by the customer under the agreement to
$30 million. Notwithstanding the above formula, the warrant becomes fully
exercisable on December 7, 2005, the date of expiration of the warrant. The
customer is not obligated to purchase any of ONI's products as a condition to
exercising the warrant. Accordingly, the warrant was expensed in 1999.

   In February 2000, in connection with the signing of a Purchase and License
Agreement with a customer to provide certain ONI products in the future, ONI
issued a warrant to purchase 223,000 shares of common stock at an exercise
price of $0.91 per share. The value of $3,000,242 ascribed to the warrant was
estimated using the Black-Scholes option valuation model with the following
assumptions: no expected dividend yield; risk free interest rate of 5.50%;
expected volatility of 70%; and contractual term of seven years. The warrant
was nonforfeitable when issued, and becomes exercisable on the ratio of the
dollar volume of purchases of ONI's products by the customer under the
agreement to $20 million. Notwithstanding the above formula, the warrant
becomes fully exercisable on February 14, 2007, the date of expiration of the
warrant. Under the terms of the Purchase and License Agreement, the customer
has the ability to terminate the agreement upon 120 days written notice, and
provided the customer purchased $1 million of product from ONI in fiscal 2000.
The customer is not obligated to purchase any of ONI's products as a condition
to exercising the warrant. Accordingly, the warrant was expensed in the three-
month period ended March 31, 2000.

   In March, 2000, as consideration for professional services rendered, ONI
issued a warrant to purchase 200,000 shares of common stock at an exercise
price of $15.00 per share. The value of

                                      F-19
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

$1,544,600 ascribed to the warrant was estimated using the Black-Scholes option
valuation model with the following assumptions: no expected dividend yield;
risk free interest rate of 5.50%; expected volatility of 70%; and a contractual
term of four years. The warrant was expensed in the three month period ended
March 31, 2000.

 (c) Stock Option Plans

   1997 Stock Option Plan

   On October 29, 1997, ONI's Board of Directors adopted the 1997 Stock Option
Plan (the 1997 Plan) and reserved a total of 7,638,508 shares of ONI's common
stock for issuance thereunder. ONI did not file a timely notice of Issuance of
Shares pursuant to California securities law and consequently any options to
purchase shares or restricted stock purchase offers issued under the 1997 Plan
did not qualify for an exemption from qualification under California securities
law. As a result, the Board of Directors terminated the 1997 Plan in April 1998
and approved a repurchase offer for any holder of options of shares under the
1997 Plan. The repurchase offer expired without any shares being repurchased.

   Options granted under the 1997 Plan may be designated as "Incentive Stock
Options" or "Nonstatutory Stock Options" at the discretion of ONI, with
exercise prices not less than the fair market value at the date of grant.
Options generally vest 25% on the first anniversary of the vesting start date
and then monthly over the next three years. Options expire ten years from the
date of grant.

   1998 Equity Incentive Plan

   In 1998, the Board of Directors of ONI adopted the 1998 Equity Incentive
Plan (the 1998 Plan) and reserved a total of 23,407,604 shares of ONI's common
stock for issuance thereunder.

   Under the 1998 Plan, the Board of Directors may grant incentive stock
options, nonqualified stock options and restricted stock awards. Options
granted under the 1998 Plan generally vest 25% on the first anniversary of the
vesting start date and then monthly over the next three years. Options granted
under the 1998 Plan expire ten years from the date of grant.

                                      F-20
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   1999 Equity Incentive Plan

   In 1999, the Board of Directors of ONI adopted the 1999 Equity Incentive
Plan (the 1999 Plan) and reserved a total of 6,200,000 shares of ONI's common
stock for issuance thereunder. The terms of the 1999 Plan are substantially
similar to those of the 1998 Plan.

   A summary of the status of ONI's option plans is as follows:
<TABLE>
<CAPTION>
                                                             Outstanding options
                                                             -------------------
                                                             Weighted  Weighted
                                      Shares                 average   average
                                     available   Number of   exercise grant date
                                     for grant     shares     price   fair value
                                    -----------  ----------  -------- ----------
<S>                                 <C>          <C>         <C>      <C>
Authorized.........................  29,751,768         --
  Granted..........................  (1,078,220)  1,078,220   $0.005    $0.19
  Exercised........................         --          --
  Cancelled........................         --          --
                                    -----------  ----------
Balance as of December 31, 1997....  28,673,548   1,078,220    0.005
  Granted.......................... (10,885,796) 10,885,796     0.08    $0.69
  Exercised........................         --   (1,651,332)    0.08
  Cancelled........................   1,522,908  (1,522,908)    0.07
                                    -----------  ----------
Balance as of December 31, 1998....  19,310,660   8,789,776     0.08
  Granted.......................... (20,178,438) 20,178,438     0.42    $1.90
  Exercised........................         --   (8,709,066)    0.46
  Cancelled........................   2,710,424  (2,710,424)    0.08
                                    -----------  ----------   ------
Balance as of December 31, 1999....   1,842,646  17,548,724   $ 0.29
                                    ===========  ==========   ======
  Authorized*......................   4,994,079         --       --
  Granted*.........................  (5,630,827)  5,630,827     2.28    $2.95
  Exercised*.......................         --   (3,664,285)    1.48
  Cancelled*.......................     171,921    (171,921)    1.10
                                    -----------  ----------   ------
Balance as of March 31, 2000*......   1,377,819  19,343,345   $ 0.64
                                    ===========  ==========   ======
</TABLE>
--------
*  Unaudited

   The following table summarizes information with respect to stock options
outstanding as of March 31, 2000:

<TABLE>
<CAPTION>
     Exercise             Options                   Contractual                  Exercisable
      price             outstanding                 life (years)                   Options
     --------           -----------                 ------------                 -----------
     <S>                <C>                         <C>                          <C>
     $0.005                200,876                      7.71                        80,550
      0.075                117,212                      7.86                         7,322
      0.09              11,393,482                      8.99                       128,506
      0.456                 20,000                      9.33                           --
      0.91               3,669,450                      9.54                           --
      1.25               2,825,900                      9.77                        21,375
      3.20                 829,800                      9.91                           --
      5.25                 162,000                      9.95                           --
      7.50                 124,625                      9.98                           --
                        ----------                                                 -------
     $0.64              19,343,345                      9.24                       237,753
                        ==========                                                 =======
</TABLE>

                                      F-21
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


   Accounting for Stock-Based Compensation

   ONI uses the intrinsic value method prescribed by APB No. 25 in accounting
for its stock-based compensation arrangements for employees whereby
compensation cost is recognized to the extent the fair value of the underlying
common stock exceeds the exercise price of the stock options at the date of
grant. Deferred stock compensation of $190,875 for the period from October 20,
1997 (inception) to December 31, 1997, and $8,432,317, and $41,730,329 for the
year ended December 31, 1998 and 1999, respectively, has been recorded for the
excess of the fair value of the common stock underlying the options at the
grant date over the exercise price of the options. An additional $66,696,890 of
deferred stock compensation was recorded for the three months ended March 31,
2000. These amounts are being amortized on an accelerated basis over the
vesting period, generally four years, consistent with the method described in
FASB Interpretation No. 28. Amortization of deferred compensation was $89,249
for the period from October 20, 1997 (inception) to December 31, 1997,
$3,310,368 in 1998 and $11,421,739 in 1999. Amortization of deferred
compensation for the three months ended March 31, 1999 and 2000 was $1,296,281
and $13,027,199, respectively.

   In 1998, ONI's Chief Executive Officer purchased 717,624 shares of common
stock that were subject to repurchase pending the achievement of certain
milestones in 1998 and 1999. The shares were remeasured at each date the
milestones were achieved based on the fair value of the common stock at that
date, pursuant to the variable plan treatment ascribed under APB 25. All the
milestones stipulated in the employment agreement were met as of December 31,
1999. Accordingly, additional compensation expense of $836,929 was recorded in
1999. Had compensation cost for ONI's stock-based compensation plan been
determined consistent with the fair value approach set forth in SFAS No. 123,
ONI's net losses would have been as follows:

<TABLE>
<CAPTION>
                            Period from     Year ended December       Three months ended
                         October 20, 1997           31,                   March 31,
                          (inception) to   -----------------------  -----------------------
                         December 31, 1997    1998        1999         1999        2000
                         ----------------- ----------  -----------  ----------  -----------
                                                                         (unaudited)
<S>                      <C>               <C>         <C>          <C>         <C>
Net loss--as reported...     $199,056      $8,852,168  $46,571,571  $4,777,022  $34,167,291
Net loss--pro forma.....     $199,056      $8,900,007  $46,917,722  $4,809,910  $34,935,988
Basic and diluted net
 loss per share--as
 reported...............     $  (0.77)     $    (0.74) $     (2.58) $    (0.35) $     (1.41)
Basic and diluted net
 loss per share--pro
 forma..................     $  (0.77)     $    (0.75) $     (2.60) $    (0.36) $     (1.44)
</TABLE>

   The fair value of options granted is estimated on the date of grant using
the minimum value method with the following weighted-average assumptions: no
dividend yield; risk-free interest rates of 5.75% and 5.5% in 1998 and 1999,
respectively, and an expected life of five years.

(10) Commitments and Contingencies

 (a) Leases

   In February 1999, the Company entered into a leasing agreement with a
financing company which allows ONI to draw up to $1,050,000 for the lease of
certain equipment and $450,000 for the lease of software and tenant
improvements. The leases are accounted for as capital leases. The lease
obligations under this agreement are repayable in 42 equal monthly installments
of principal plus interest commencing on the individual lease inception dates
and are secured by the leased assets.


                                      F-22
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

   In connection with the equipment leasing agreement, ONI issued to the
financing company warrants to purchase 68,062 shares of Series B preferred
stock at a price of $0.88 per share. The warrants expire on February 10, 2009,
or five years from the effectiveness of the ONI's initial public offering, if
earlier. No warrants had been exercised as of December 31, 1999. The fair value
of the warrants was determined to be $49,855, calculated using the Black-
Scholes option pricing model, using the following assumptions: no dividends;
contractual term of ten years; risk-free interest rate of 5.5%; and expected
volatility of 70%. The fair value of the warrants has been recorded as
additional paid-in capital and is being amortized as interest expense over the
term of the lease agreement.

   ONI leases its headquarters facility under a noncancelable operating lease,
and has acquired furniture and other equipment through capital leases. Future
minimum payments for both operating and capital leases as of March 31, 2000 are
as follows:

<TABLE>
<CAPTION>
 Year ending
  December                                                 Capital   Operating
     31,                                                    leases    leases
 -----------                                               -------- -----------
 <S>                                                       <C>      <C>
   9 months ended 2000.................................... $126,423 $ 3,454,229
   2001...................................................  186,525   3,550,550
   2002...................................................  151,060   2,339,673
   2003...................................................   62,941   1,639,124
   2004...................................................      --    1,709,660
   Thereafter.............................................      --    3,630,925
                                                           -------- -----------
   Future minimum lease payments..........................  526,949 $16,324,159
                                                                    ===========
   Less amount representing interest......................   60,666
                                                           --------
   Present value of future minimum lease payments.........  466,283
   Less current portion...................................  170,905
                                                           --------
   Long-term portion...................................... $295,378
                                                           ========
</TABLE>

   Total rent expense under the operating leases was $494,308, $908,115 and
$714,879 for the years ended December 31, 1998, 1999 and the quarter ended
March 31, 2000, respectively, and $0 for the period from October 20, 1997
(inception) to December 31, 1997.

 (b) Contingencies

   In March 2000, Nortel Networks (Nortel) filed suit against ONI in the United
States District Court for the Northern District of California. The suit alleges
that ONI's products infringe five patents held by Nortel, and sets forth
allegations of misappropriation of trade secrets, unlawful business practices
and common law unfair competition. Nortel is seeking preliminary and permanent
injunctions and damages against ONI in connection with these claims. In April
2000, ONI filed a motion to dismiss Nortel's claims, and ONI also filed an
answer and counterclaims asserting unfair business practices, tortious
interference, breach of contract and declarations of invalidity,
unenforceability and non-infringement of the patents against Nortel. ONI
expects to incur substantial legal and other expenses in connection with the
Nortel Networks litigation. In the event of an adverse ruling, ONI also could
be required to pay damages to Nortel Networks. The accompanying consolidated
financial statements do not include any costs, if any, that might result from
this uncertainty.

   From time-to-time ONI may be subject to other legal proceedings and claims
in the ordinary course of business. ONI is not aware of any legal proceedings
or claims, including the above matter that ONI believes will have, individually
or in the aggregate, a material adverse effect on ONI's business, financial
condition or results of operations.

                                      F-23
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)


(11) Income Taxes

   Income tax expense consists of current state tax of $826 and $1,600 for the
years ended December 31, 1998 and 1999, respectively, and current state tax of
$2,500 for the three months ended March 31, 2000.

   The reconciliation between the amount computed by applying the U.S. federal
statutory tax rate of 34% to loss before income tax and the actual provision
for income taxes is a follows:

<TABLE>
<CAPTION>
                                                                  Three months
                                Period ended December 31,            ended
                            -----------------------------------  March 31, 2000
                              1997       1998          1999       (unaudited)
                            --------  -----------  ------------  --------------
<S>                         <C>       <C>          <C>           <C>
Income tax (benefit) at
 statutory rate............ $(67,679) $(3,009,456) $(15,833,790)  $(11,616,879)
State taxes net of federal
 income tax benefit........      --           826         1,600          2,500
Permanent differences......       48        4,039        24,612             --
Stock Compensation.........       53      417,762     3,161,650      3,853,534
Goodwill Amortization......      --           --        482,780        245,650
Current year net operating
 loss and temporary
 differences for which no
 benefit is recognized.....   67,578    2,587,655    12,164,748      7,517,695
                            --------  -----------  ------------   ------------
Total income tax expense... $    --   $       826  $      1,600   $      2,500
                            ========  ===========  ============   ============
</TABLE>

   The effects of temporary differences that give rise to significant portions
of deferred tax assets are as follows:

<TABLE>
<CAPTION>
                                             December 31,
                                       -------------------------  March 31, 2000
                                          1998          1999       (unaudited)
                                       -----------  ------------  --------------
<S>                                    <C>          <C>           <C>
Deferred tax assets:
 Deferred state taxes................  $       --   $      1,000   $      1,000
 Fixed assets........................       39,000       141,000        141,000
 Capitalized start-up and
  organizational expense.............      343,000       236,000        236,000
 Net operating loss carryforwards....    2,011,000    14,707,000     21,276,000
 Deferred stock compensation.........      930,000     3,502,000      6,428,000
 Research and other credit
  carryforwards......................      394,000     2,047,000      2,047,000
 Accrual amounts.....................       12,000       293,000        293,000
                                       -----------  ------------   ------------
  Total gross deferred tax assets....    3,729,000    20,927,000     30,422,000
Valuation allowance..................   (3,729,000)  (20,682,000)   (30,422,000)
                                       -----------  ------------   ------------
  Total deferred tax assets..........          --        245,000        336,000
 Deferred tax liabilities:
  Intangibles........................          --       (245,000)      (336,000)
                                       -----------  ------------   ------------
 Net deferred tax assets, net of
  deferred tax liabilities...........  $       --   $        --    $        --
                                       ===========  ============   ============
</TABLE>

   Management has established a valuation allowance for the portion of deferred
tax assets for which realization is uncertain. The change in the valuation
allowance for deferred tax assets was an increase of $3,729,000 in 1998 and an
increase of $16,650,000 in 1999.

   As of December 31, 1999, ONI has net operating loss carryforwards for
federal and California income tax purposes of approximately $34,000,000
available to reduce future income subject to incomes taxes. The net operating
loss carryforwards for federal income tax purposes expire in various years
beginning in 2012 through 2019. The net operating loss carryforwards for
California purposes expire in 2005.


                                      F-24
<PAGE>

                               ONI SYSTEMS CORP.

            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

   ONI also has research credit carryforwards as of December 31, 1999 for
federal and California income tax return purposes of approximately $1,125,000
and $864,000, respectively, available to reduce future income taxes. The
federal research credit carryforward will expire in various years from 2012
through 2019. The California research credit carryforward carries forward
indefinitely until realized. ONI also has a California manufacturing investment
credit carryforward of $59,000 which will expire in various years beginning in
2007 through 2008.

   ONI's ability to use net operating loss and credit carryforwards may be
subject to limitations pursuant to the ownership change rule of the Internal
Revenue Code, Section 382 and corresponding state tax law.

(12) Employee Benefit Plan

   ONI has an Employee Savings and Retirement Plan (the Benefit Plan) under
Section 401(k) of the Internal Revenue Code for its eligible employees. The
Benefit Plan is available to all of ONI's employees who meet minimum age and
service requirements, and provides employees with tax deferred salary
deductions and alternative investment options. Employees may contribute up to
15% of their eligible earnings, subject to certain limitations. There are no
matching contributions under the Benefit Plan.

(13) Subsequent Events

(a) In April 2000, ONI adopted a 2000 Equity Incentive Plan, under which
    7,000,000 shares of ONI's common stock were reserved exclusively for
    issuance under the plan. In addition, ONI adopted a 2000 Employee Stock
    Purchase Plan, to be effective on the first day on which price quotations
    are available for ONI's common stock on the NASDAQ National Market, in
    which 1,000,000 shares of common stock were reserved exclusively for
    issuance under the plan.

(b) In March 2000, ONI entered into an agreement with Internet Initiative Japan
    Inc. to sell to it $4.0 million of common stock, at the initial public
    offering price per share, in a private placement that will close
    concurrently with ONI's initial public offering.

(c) Effective April 25, 2000, ONI reincorporated as a Delaware corporation.
    Share capital information for all periods has been retroactively adjusted
    to reflect the par value of common and preferred stock and amounts of paid-
    in capital.

(d) In April 2000, ONI entered into an agreement with CCT Telecom Holdings
    Limited to sell to it $10.0 million of common stock, at the initial public
    offering price per share, in a private placement that will close concurrent
    with ONI's initial public offering.

(e) On May 9, 2000, ONI sold 1,333,333 shares of Series H preferred stock to
    Sun Microsystems, Inc., at a price per share of $15.00. These shares of
    preferred stock will convert into common stock upon the completion of an
    initial public offering. The number of shares of common stock to be issued
    on conversion will be determined using a 17.5% discount from the price at
    which common stock is sold in the initial public offering.

(f) In May 2000, ONI granted an option to purchase 1,000,000 shares of common
    stock outside of the existing stock option plans with an exercise price of
    $4.00 per share to Chris A. Davis, ONI's new Executive Vice President,
    Chief Financial and Administrative Officer. This grant will result in
    additional deferred stock compensation of $10.0 million, which will be
    amortized over four years from the date of the grant.

                                      F-25
<PAGE>

                          Independent Auditors' Report

The Board of Directors
Object-Mart, Inc.:

   We have audited the accompanying balance sheet of Object-Mart, Inc. as of
December 31, 1998, and the related statements of operations, shareholders'
equity, and cash flows for the year ended December 31, 1998 and for the six
months ended June 29, 1999. 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 audit.

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

   In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Object-Mart, Inc. as of
December 31, 1998, and the results of operations and cash flows of Object-Mart,
Inc. for the year ended December 31, 1998 and for the six months ended June 29,
1999, in conformity with generally accepted accounting principles.

                                          /s/ KPMG LLP

Mountain View, California
April 10, 2000

                                      F-26
<PAGE>

                               OBJECT-MART, INC.

                                 BALANCE SHEET

<TABLE>
<CAPTION>
                                ASSETS                              December 31, 1998
                                ------                              -----------------
    <S>                                                             <C>
    Current assets:
      Cash and cash equivalents...................................      $  54,568
      Accounts receivable.........................................        383,907
      Other current assets........................................         12,623
                                                                        ---------
        Total current assets......................................        451,098
    Property and equipment........................................         62,428
    Other assets..................................................          1,298
                                                                        ---------
        Total assets..............................................      $ 514,824
                                                                        =========
<CAPTION>
                 LIABILITIES AND SHAREHOLDERS' EQUITY
                 ------------------------------------
    <S>                                                             <C>
    Current liabilities:
      Accounts payable............................................         15,869
      Accrued expenses............................................          9,127
      Deferred income taxes.......................................        136,863
                                                                        ---------
        Total current liabilities.................................        161,859
    Shareholders' equity:
    Common Stock, no par value; 10,000,000 shares authorized and
     2,751,000 shares issued and outstanding at December 31, 1998.        146,060
    Notes receivable from shareholder.............................       (143,360)
    Retained earnings.............................................        350,265
                                                                        ---------
        Total shareholders' equity................................        352,965
                                                                        ---------
          Total liabilities and shareholders' equity..............      $ 514,824
                                                                        =========
</TABLE>


                 See accompanying notes to financial statements

                                      F-27
<PAGE>

                               OBJECT-MART, INC.

                            STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                       Year ended   Six months
                                                      December 31,     ended
                                                          1998     June 29, 1999
                                                      ------------ -------------
<S>                                                   <C>          <C>
Revenue..............................................  $1,933,081   $1,744,600
  Cost of revenue....................................   1,023,922      509,013
                                                       ----------   ----------
    Gross profit.....................................     909,159    1,235,587
                                                       ----------   ----------
Operating expenses:
  Research and development...........................     198,526      582,927
  Sales and marketing................................     129,451       52,888
  General and administrative.........................      69,237      105,524
  Stock compensation.................................          --      466,507
                                                       ----------   ----------
    Total operating expenses.........................     397,214    1,207,846
                                                       ----------   ----------
    Operating income.................................     511,945       27,741
Interest income, net.................................       8,138       14,286
                                                       ----------   ----------
  Income before income taxes.........................     520,083       42,027
Income taxes.........................................     207,140      109,023
                                                       ----------   ----------
    Net income/(loss)................................  $  312,943   $  (66,996)
                                                       ==========   ==========
</TABLE>


                See accompanying notes to financial statements.

                                      F-28
<PAGE>

                                OBJECT-MART, INC

                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                     Six months
                                                                       ended
                                                      Year ended      June 29,
                                                   December 31, 1998    1999
                                                   ----------------- ----------
<S>                                                <C>               <C>
Cash flows from operating activities:
 Net income/(loss)...............................      $ 312,943     $  (66,996)
 Deferred tax expense............................            --          28,543
 Adjustments to reconcile net loss to net cash
  used in operating activities:
  Depreciation and amortization..................         46,521         20,811
  Amortization of deferred stock compensation....            --         466,507
 Changes in operating assets and liabilities:
  Accounts receivable............................       (349,750)      (206,400)
  Prepaid expenses and other current assets......        (12,208)      (198,000)
  Other assets...................................            410            --
  Accounts payable...............................          9,536        (15,836)
  Accrued liabilities............................         (7,475)       275,838
  Deferred income taxes..........................        136,863       (121,828)
  Deferred revenue...............................            --       1,000,000
                                                       ---------     ----------
    Net cash provided by operating activities....       (136,840)     1,182,639

Cash flows used in investing activities:
 Purchase of property and equipment..............       (108,948)       (58,951)
                                                       ---------     ----------
    Net cash used in investing activities........       (108,948)       (58,951)
                                                       ---------     ----------

Cash flows from financing activities:
 Proceeds from issuance of common stock..........          2,700        255,638
                                                       ---------     ----------
    Net cash provided by financing activities....          2,700        255,638
                                                       ---------     ----------
    Net increase in cash and cash equivalents....         30,592      1,379,326
Cash and cash equivalents at beginning of period.         23,976         54,568
                                                       ---------     ----------
Cash and cash equivalents at end of period.......      $  54,568     $1,433,894
                                                       =========     ==========
</TABLE>



                See accompanying notes to financial statements.

                                      F-29
<PAGE>

                               OBJECT-MART, INC.

                       STATEMENTS OF SHAREHOLDERS' EQUITY
        Year ended December 31, 1998 and six months ended June 29, 1999

<TABLE>
<CAPTION>
                                               Notes
                            Common stock     receivable                Total
                         ------------------     from     Retained  shareholders'
                          Shares    Amount  shareholders earnings     equity
                         --------- -------- ------------ --------  -------------
<S>                      <C>       <C>      <C>          <C>       <C>
Balance as of December
 31, 1997............... 2,500,000 $ 65,500  $ (65,500)  $ 37,322   $   37,322
Issuance of common
 stock..................   251,000   80,560    (77,860)       --         2,700
Net income..............       --       --         --     312,943      312,943
                         --------- --------  ---------   --------   ----------
Balance as of December
 31, 1998............... 2,751,000 $146,060  $(143,360)  $350,265   $  352,965
Exercise of options for
 cash...................   877,500  255,638        --         --       255,638
Stock compensation......       --   466,507        --         --       466,507
Net loss................       --       --         --     (66,996)     (66,996)
                         --------- --------  ---------   --------   ----------
                         3,628,500 $868,205  $(143,360)  $283,269   $1,008,114
                         ========= ========  =========   ========   ==========
</TABLE>



                See accompanying notes to financial statements.

                                      F-30
<PAGE>

                               OBJECT-MART, INC.

                         NOTES TO FINANCIAL STATEMENTS

        Year ended December 31, 1998 and six months ended June 29, 1999

(1) Description of Business and Significant Accounting Policies

 (a) Description of Business

   Object-Mart, Inc. (Object-Mart) was incorporated in California on February
27, 1997. The company provided telecommunications software products and
services to telecommunications software development companies, service
providers and equipment manufacturers.

 (b) Use of Estimates

   The preparation of financial statements in conformity with generally
accepted accounting principles requires Object-Mart to make estimates and
assumptions that affect the reported amounts of assets, liabilities, revenue
and expenses, and to disclose contingent assets and liabilities at the date of
the financial statements and the reported results of operations during the
reporting period. Actual results could differ from those estimates.

 (c) Cash and Cash Equivalents

   Object-Mart considers highly liquid investments with remaining maturities of
less than three months at the date of purchase to be cash equivalents. As of
December 31, 1998, cash equivalents consisted of a money market account in the
amount of $50,862.

 (d) Accounts Receivable

   Accounts receivable is comprised of unbilled trade accounts receivable. As
of December 31, 1998, there was no allowance for uncollectible accounts
receivable.

 (e) Property and Equipment

   Property and equipment are stated at cost and are depreciated using the
straight-line method over the estimated useful lives of the related assets,
ranging from one to three years. Depreciation expense for the year ended
December 31, 1998 was $46,521 and for the six month period ended June 29, 1999
was $20,811.

 (f) Software Development Costs

   Statement of Financial Accounting Standards No. 86, Accounting for the Costs
of Computer Software to be Sold, Leased or Otherwise Marketed, requires the
capitalization of certain software development costs incurred subsequent to the
date technological feasibility is established and prior to the date the product
is generally available for sale. The capitalized cost is then amortized over
the estimated life of the product. To date, Object-Mart has not capitalized any
software development costs because capitalizable costs meeting the requirements
SFAS No. 86 have not been significant.

 (g) Revenue Recognition

   Object-Mart derives its revenue from software license agreements and
consulting services. Software license revenues are recognized upon execution of
the license agreement and delivery of the software. In all cases, however, no
significant post-contract obligations of Object-Mart shall be remaining.
Otherwise, software license fees are deferred until all of the requirements for
revenue

                                      F-31
<PAGE>

                               OBJECT-MART, INC.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)
recognition have been satisfied. Consulting services contracts include both
hourly service-based contracts and milestone based contracts. Hourly service-
based contracts are billed and recognized as the services are performed.
Milestone-based contracts are billed and recognized when the milestones are
completed and when product, if any, committed for the milestones is shipped and
accepted.

   Revenue from the sale of software was accounted for in accordance with
Statement of Position (SOP) 97-2, Software Revenue Recognition, SOP 98-4,
Deferral of Effective Date of SOP 97-2, and SOP 98-9, Software Revenue
Recognition with Respect to Certain Arrangements.

 (h) Research and Development

   All research and development costs are expensed as incurred.

 (i) Fair Value of Financial Instruments

   The fair value of Object-Mart's cash and cash equivalents, accounts
receivable, prepaid expenses and other current assets, accounts payable and
accrued liabilities approximates their carrying value due to the short-term
nature of those instruments.

 (j) Stock-Based Compensation

   Object-Mart accounts for stock-based awards to employees using the intrinsic
value method. Expense associated with stock-based compensation is being
amortized on an accelerated basis over the vesting period of the individual
award consistent with the method described in Financial Accounting Standards
Board (FASB) Interpretation No. 28. Consistent with the fair value approach
enumerated in SFAS No. 123, Object-Mart discloses the pro forma effects of
using the fair value method of accounting for stock-based compensation
arrangements.

 (k) Comprehensive Income/Loss

   Other comprehensive income/loss refers to revenue, expenses, gains and
losses that are not included in net income/loss, but rather are recorded
directly in stockholders' equity. To date, Object-Mart has no items of other
comprehensive income/loss and, accordingly, comprehensive loss is the same as
net loss.

 (l) Income Taxes

   Object-Mart utilizes the asset and liability method of accounting for income
taxes. Deferred tax assets and liabilities are recognized for the estimated
future tax consequences attributable to differences between the financial
statement carrying amounts of existing assets and liabilities and their
respective tax bases. Deferred tax assets and liabilities are measured using
enacted tax rates expected to apply to taxable income in the years in which
those temporary differences are expected to be recovered or settled. Valuation
allowances are established when necessary to reduce deferred tax assets to the
amounts expected to be realized.

                                      F-32
<PAGE>

                               OBJECT-MART, INC.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)

   Income tax expense for the year ended December 31, 1998 and the six months
ended June 29, 1999 consisted of:

<TABLE>
<CAPTION>
                                                    Year ended
                                                   December 31, Six months ended
                                                       1998      June 29, 1999
                                                   ------------ ----------------
   <S>                                             <C>          <C>
   Current:
     Federal......................................   $ 54,798      $ 182,007
     State........................................     15,479         48,845
                                                     --------      ---------
       Total current tax expense..................   $ 70,277      $ 230,852
                                                     --------      ---------
   Deferred:
     Federal......................................    106,414        (97,429)
     State........................................     30,449        (24,400)
                                                     --------      ---------
       Total deferred tax expense (credit)........    136,863       (121,829)
                                                     --------      ---------
       Total tax expense..........................   $207,140      $ 109,023
                                                     ========      =========
</TABLE>

   The income tax expense differed from the amounts computed by applying the
U.S. federal income tax rate of 34% to pretax income as a result of the
following:

<TABLE>
<CAPTION>
                                                December 31, 1998 June 29, 1999
                                                ----------------- -------------
   <S>                                          <C>               <C>
   Federal tax at statutory rate...............     $176,828        $ 14,289
   State taxes, net of federal income tax
    benefit....................................       30,312          18,011
   Deferred stock compensation.................          --           79,362
   Other.......................................          --           (2,639)
                                                    --------        --------
       Total tax expense.......................     $207,140        $109,023
                                                    ========        ========
</TABLE>

   The types of temporary differences that give rise to significant portions of
Object-Mart's deferred tax assets and liabilities are set out below.

<TABLE>
<CAPTION>
                                                                    December 31,
                                                                        1998
                                                                    ------------
   <S>                                                              <C>
   Deferred tax assets:
    State income taxes.............................................  $  15,616
    Plant and equipment............................................      1,279
                                                                     ---------
   Gross deferred tax assets.......................................     16,895
   Deferred tax liabilities:
    Accruals and reserves..........................................   (153,758)
                                                                     ---------
   Net deferred tax liabilities....................................  $(136,863)
                                                                     =========
</TABLE>


                                      F-33
<PAGE>

                               OBJECT-MART, INC.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)


(2) Property and Equipment

   Property and equipment as of December 31, 1998 consisted of the following:

<TABLE>
<CAPTION>
                                                                    December 31,
                                                                        1998
                                                                    ------------
    <S>                                                             <C>
    Computers......................................................   $ 85,488
    Software.......................................................     18,985
    Furniture......................................................      4,476
                                                                      --------
                                                                       108,949
    Less accumulated depreciation..................................     46,521
                                                                      --------
    Total..........................................................   $ 62,428
                                                                      ========
</TABLE>

(3) Concentrations of Credit Risk

   Financial instruments, which potentially subject Object-Mart to
concentrations of credit risk, consist principally of cash equivalents and
accounts receivable. Cash equivalents are money market funds maintained with a
high quality financial institution. Object-Mart generally does not require
collateral for sales on credit. Object-Mart closely monitors extensions of
credit and has not experienced significant credit losses in the past.

   A summary of sales to major customers that exceeded 10% of total sales
during the year ended December 31, 1998 and the six months ended June 29, 1999,
and the amount due from these customers as of December 31, 1998 follows:

<TABLE>
<CAPTION>
                                                   Sales
                                        --------------------------- December 31,
                                         Year ended    Six months       1998
                                        December 31, ended June 29,   Accounts
                                            1998          1999       receivable
                                        ------------ -------------- ------------
    <S>                                 <C>          <C>            <C>
    Customer A.........................   $725,810      $    --       $ 90,000
    Customer B.........................   $661,521      $    --       $    --
    Customer C.........................   $277,350      $279,900      $277,350
    Customer D.........................   $268,400      $788,800      $ 18,400
    Customer E.........................   $    --       $387,600      $    --
</TABLE>

(4) Shareholders' Equity

 (a) Common Stock

   In June 1999, in connection with the acquisition by ONI Systems, Corp.
(ONI), all outstanding shares of common stock of Object-Mart were acquired by
ONI in exchange for ONI's common stock and cash consideration. Pursuant to the
acquisition agreement, all shares of Object-Mart's common stock and outstanding
options became vested upon acquisition were exchanged into ONI's common stock.
As a result, Object-Mart recorded $466,507 of stock compensation.

 (b) Stock Option Plan

   1998 Stock Option Plan

   In July 1998, Object-Mart's Board of Directors adopted the 1998 Stock Option
Plan (1998 Plan) and reserved a total of 1,000,000 share of Object-Mart's
common stock for issuance thereunder. Options granted under the 1998 Plan may
be designated as "Incentive Stock Options" or "Nonstatutory Stock Options" at
the discretion of Object-Mart, with exercise prices not less than the

                                      F-34
<PAGE>

                               OBJECT-MART, INC.

                   NOTES TO FINANCIAL STATEMENTS--(Continued)

fair market value at the date of grant. Options generally vest 25% on the first
anniversary of the vesting start date and then monthly over the next three
years. Options expire ten years from the date of grant. All options were vested
upon Object-Mart's acquisition by ONI.

   A summary of the status of Object-Mart's option plan is as follows:

<TABLE>
<CAPTION>
                                                      Outstanding options
                                                 ------------------------------
                             Shares     Number      Weighted       Weighted
                            available     of        average      average grant
                            for grant   shares   exercise price date fair value
                            ---------  --------  -------------- ---------------
   <S>                      <C>        <C>       <C>            <C>
   Balance as of December
    31, 1997...............        --        --
   Authorized in July,
    1998................... 1,000,000
    Granted................  (900,000)  900,000      $0.20           $0.20
    Exercised..............        --   (75,000)      0.20
    Cancelled..............   200,000  (200,000)      0.20
                            ---------  --------      -----
   Balance as of 12/31/98..   300,000   625,000      $0.20
    Granted................  (295,500)  295,500       0.60           $0.60
    Exercised..............        --  (917,500)      0.33
    Cancelled..............     3,000    (3,000)      0.20
                            ---------  --------      -----
   Balance as of June 29,
    1999...................     7,500        --      $  --
                            ---------  --------      -----
</TABLE>

 (c) Accounting for Stock-Based Compensation

   Object-Mart uses the intrinsic value method in accounting for its employee
stock-based compensation plan. Accordingly, no compensation cost has been
recognized for any of its stock options granted because the exercise price of
each option equaled or exceeded the fair value of the underlying common stock
as of the grant date for each stock option.

   Had compensation cost for Object-Mart's stock-based compensation plan been
determined consistent with the fair value approach set forth in SFAS No. 123,
Object-Mart's net loss applicable to common stockholders for the year ended
December 31, 1998, and the six month ended June 29, 1999, would not have been
materially different from the reported net income/loss.

                                      F-35
<PAGE>

                               ONI SYSTEMS CORP.

         UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS

   The following unaudited pro forma combined condensed statement of operations
is presented for illustrative purposes only and is not necessarily indicative
of the combined results of operations for future periods or the results of
operations that actually would have been realized had ONI Systems and Object-
Mart, Inc. been a combined company during the specified periods. The unaudited
pro forma combined condensed statement of operations, including the related
notes, is qualified in its entirety by reference to, and should be read in
conjunction with, the historical financial statements and related notes thereto
of ONI Systems and Object-Mart, Inc., included elsewhere in this prospectus.
The following unaudited pro forma combined condensed statement of operations
gives effect to the acquisition of Object-Mart, Inc. by ONI Systems using the
purchase method of accounting. The unaudited pro forma combined condensed
statement of operations is based on the respective historical audited financial
statements and related notes of ONI Systems and Object-Mart, Inc.

   The unaudited pro forma combined condensed statement of operations assumes
that the acquisition took place on January 1, 1999 and combines ONI Systems,
audited consolidated statement of operations for the year ended December 31,
1999 which includes Object-Mart's results of operations subsequent to June 29,
1999, the date of acquisition, with Object-Mart's audited consolidated
statement of operations for the six months ended June 29, 1999.

                                      F-36
<PAGE>

                               ONI SYSTEMS CORP.

         UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS
                          Year ended December 31, 1999

<TABLE>
<CAPTION>
                               Historical                 Pro forma
                         ------------------------  ----------------------------
                                        Object-
                         ONI Systems      Mart     Adjustments       Combined
                         ------------  ----------  -----------     ------------
<S>                      <C>           <C>         <C>             <C>
Revenue................. $  3,033,995  $1,744,600  $  (152,800)(a) $  4,625,795
 Cost of revenues.......    1,032,144     509,013      (64,384)(b)    1,476,773
                         ------------  ----------  -----------     ------------
                            2,001,851   1,235,587      (88,416)       3,149,022
                         ------------  ----------  -----------     ------------
Operating expenses:
 Research and
  development...........   25,399,728     582,927     (101,108)(c)   25,881,547
 Sales and marketing....    4,557,245      52,888       12,692 (d)    4,622,825
 General and
  administrative........    4,755,582     105,524    1,419,960 (e)    6,281,066
 Amortization of
  deferred stock
  compensation..........   11,421,739     466,507          --        11,888,246
 Amortization of common
  stock warrants........    2,890,500         --           --         2,890,500
 In-process research and
  development...........      170,000         --      (170,000)(f)          --
                         ------------  ----------  -----------     ------------
    Total operating
     expenses...........   49,194,794   1,207,846    1,161,544       51,564,184
                         ------------  ----------  -----------     ------------
    Operating loss......  (47,192,943)     27,741   (1,249,960)     (48,415,162)
 Interest income, net...      622,972      14,286          --           637,258
                         ------------  ----------  -----------     ------------
    Income (loss) before
     income taxes.......  (46,569,971)     42,027   (1,249,960)     (47,777,904)
 Income taxes...........        1,600     109,023     (109,023)(g)        1,600
                         ------------  ----------  -----------     ------------
    Net income (loss)... $(46,571,571) $  (66,996) $(1,140,937)    $(47,779,504)
                         ============  ==========  ===========     ============
 Basic and diluted net
  loss per share........ $      (2.58)                             $      (2.65)
                         ============                              ============
 Shares used to compute
  basic and diluted net
  loss per share........   18,043,188                                18,043,188
                         ============                              ============
</TABLE>


 See accompanying notes to unaudited pro forma combined condensed statement of
                                  operations.

                                      F-37
<PAGE>

                               ONI SYSTEMS CORP.

    NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS

(1) Unaudited Pro Forma Combined Condensed Statement of Operations

   The pro forma combined condensed statement of operations give effect to the
acquisition as if it had occurred on January 1,1999.

   The following adjustments have been reflected in the unaudited pro forma
combined condensed statement of operations:

  (a) Adjustment to eliminate intercompany revenue;

  (b) Adjustment to eliminate cost of revenue related to intercompany
      revenue;

  (c) Adjustment to eliminate intercompany expense of $152,800 netted against
      reclassification of cost of revenue of $51,692;

  (d) Adjustment to reclassify cost of revenue;

  (e) The adjustment to record additional amortization of goodwill for the
      six month period ended June 29, 1999 is calculated as the six-month
      amortization of the $5,679,839 goodwill recorded in relation to the
      Object-Mart acquisition, to be amortized over a two-year period;

  (f) Adjustment to reverse the value of purchased in-process research and
      development as this is a non-recurring charge; and

  (g) Adjustment to reverse income tax expense for the amount of the combined
      company.

                                      F-38
<PAGE>

                            [LOGO OF ONI SYSTEMS]
<PAGE>

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  No dealer, salesperson or other person is authorized to give any information
or to represent anything not contained in this prospectus. You must not rely
on any unauthorized information or representations. This prospectus is an
offer to sell only the shares offered hereby, but only under circumstances and
in jurisdictions where it is lawful to do so. The information contained in
this prospectus is current only as of its date.

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

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Prospectus Summary........................................................    3
Risk Factors..............................................................    7
Special Note Regarding Forward-Looking Statements.........................   18
Recent Developments.......................................................   18
Use of Proceeds...........................................................   19
Dividend Policy...........................................................   19
Capitalization............................................................   20
Dilution..................................................................   22
Selected Consolidated Financial Data......................................   24
Management's Discussion and Analysis of Financial Condition and Results of
 Operations...............................................................   25
Business..................................................................   35
Management................................................................   47
Related Party Transactions................................................   60
Principal Stockholders....................................................   65
Description of Capital Stock..............................................   68
Shares Eligible for Future Sale...........................................   72
Underwriting..............................................................   75
Validity of Common Stock..................................................   77
Experts...................................................................   77
Where You Can Find Additional Information.................................   77
Index to Financial Statements.............................................  F-1
</TABLE>

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

  Through and including June 25, 2000 (the 25th day after the date of this
prospectus), all dealers effecting transactions in these securities, whether
or not participating in this offering, may be required to deliver a
prospectus. This is in addition to a dealer's obligation to deliver a
prospectus when acting as an underwriter and with respect to an unsold
allotment or subscription.

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                               8,000,000 Shares

                               ONI Systems Corp.

                                 Common Stock

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

                              [ONI SYSTEMS LOGO]

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

                             Goldman, Sachs & Co.

                        Banc of America Securities LLC

                                   Chase H&Q

                              Robertson Stephens

                      Representatives of the Underwriters

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