NETRATINGS INC
424B3, 1999-12-09
BUSINESS SERVICES, NEC
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<PAGE>
PROSPECTUS

                                4,000,000 SHARES

                               [NETRATINGS LOGO]

                                  COMMON STOCK

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

    This is our initial public offering of shares of common stock. We are
offering 4,000,000 shares. No public market currently exists for our shares.

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

    In connection with this offering, Nielsen Media Research, Inc. has agreed to
exercise its right to purchase additional shares of common stock such that,
after completion of this offering and the purchase of additional shares by
Nielsen Media Research, our officers and directors and their affiliates,
including our majority shareholder Nielsen Media Research, will beneficially own
approximately 83.3% of our outstanding shares in the aggregate. The purchase by
Nielsen Media Research is subject to compliance with applicable federal
antitrust laws.

    INVESTING IN THE SHARES INVOLVES RISKS. "RISK FACTORS" BEGIN ON PAGE 8.

<TABLE>
<CAPTION>
                                                                Per
                                                               Share        Total
                                                              --------   -----------
<S>                                                           <C>        <C>
Public Offering Price.......................................   $17.00    $68,000,000

Underwriting Discount.......................................   $ 1.19    $ 4,760,000

Proceeds to NetRatings......................................   $15.81    $63,240,000
</TABLE>

    We have granted the underwriters a 30-day option to purchase up to 600,000
additional shares of common stock on the same terms and conditions as set forth
above solely to cover over-allotments, if any.

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

    Lehman Brothers expects to deliver the shares on or about December 13, 1999.

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

LEHMAN BROTHERS

              BANC OF AMERICA SECURITIES LLC

                             CIBC WORLD MARKETS

                                           C.E. UNTERBERG, TOWBIN

December 8, 1999
<PAGE>
[inside front cover]

[NETRATINGS LOGO]

NetRatings, working with Nielsen Media Research, provides audience research on
how people are using the Internet.

    The Nielsen//NetRatings-branded services:

    - Use industry-accepted research methodology developed by Nielsen Media
      Research

    - Collect Internet usage data in real time from over 37,000 panel members

    - Report audience profiles of site visits, advertising, and e-commerce
      activity

    - Deliver information daily, weekly and monthly

    - Provide market research and trend analysis on Internet sectors and
      companies

[Logo: Nielsen Media Research]

[Graphic: Global sphere showing users accessing Internet. Illustration:
tracking/gathering of market intelligence translated into online reports and
market analysis studies.]

[inside spread]

INFORMATION QUALITY FOR NEW MEDIA [IQ button graphic]

    - Panel research methodology and practices are based on industry-accepted
      Random Digit Dialing.

    - Representative sample of the Internet user population addresses the
      industry demand for accurate and reliable data.

REAL-TIME INTERNET MEASUREMENT COLLECTION

    - NetRatings' proprietary technology captures comprehensive data about site,
      advertising and e-commerce user activity as it occurs and simultaneously
      transmits it to our database.

    - Daily, weekly and monthly reports are available online via a flexible,
      easy-to-use interface.

[Screen shots: BannerTrack screen and Top Sites Report screen with Demographic
Report screen overlap.]

[Caption:] BannerTrack reports provide advertisers, site publishers and media
planners with ad banner information for use in competitive research, media
buying/selling and creative analysis.

[Caption:] Drill down capability: Clicking on the unique audience for a site
instantly brings up the detailed demographics for the site's visitors.

ANALYTICAL SERVICES

    - E-commerce and Internet Investment Strategies services provide the market
      intelligence required for companies to make business-critical decisions.

    - Trend analysis of emerging sectors and companies based on Internet
      activity information.

[Screen shots: Commerce Data report, Spotlights report]

[Photo: E-commerce and Investment Trend Books]

    [Logo: Nielsen Media Research] Through the combination of our Internet
    measurement software and audience measurement panels recruited by Nielsen
    Media Research using its proprietary panel methodology based on Random Digit
    Dialing, we have developed and delivered Nielsen// NetRatings-branded
    research services to over 170 customers.
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                         PAGE
                                         ----
<S>                                    <C>
Prospectus Summary...................         3
Risk Factors.........................         8
Use of Proceeds......................        22
Dividend Policy......................        22
Capitalization.......................        23
Dilution.............................        25
Selected Financial Data..............        27
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations......................        28
Business.............................        36
</TABLE>

<TABLE>
Management...........................        54
<CAPTION>
                                         PAGE
                                         ----
<S>                                    <C>
Related Party Transactions...........        63
Principal Stockholders...............        67
Description of Capital Stock.........        70
Shares Eligible for Future Sale......        73
Underwriting.........................        75
Legal Matters........................        77
Experts..............................        77
Where You Can Find More Information..        78
Index to Financial Statements........       F-1
</TABLE>

                             ABOUT THIS PROSPECTUS

    You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information different from that
contained in this prospectus. This prospectus is not an offer to sell or a
solicitation of an offer to buy our common stock in any jurisdiction where it is
unlawful. The information contained in this prospectus is accurate only as of
the date of this prospectus, regardless of the time of delivery of this
prospectus or of any sale of common stock.

    This preliminary prospectus is subject to completion prior to this offering.

    Some of the statements under the captions "Prospectus Summary," "Risk
Factors," "Use of Proceeds," "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and "Business" and elsewhere in this
prospectus are "forward-looking statements." These forward-looking statements
include, but are not limited to, statements about our plans, objectives,
expectations and intentions and other statements contained in the prospectus
that are not historical facts. When used in this prospectus, the words
"anticipates," "believes," "continue," "could," "estimate," "expects,"
"intends," "may," "plans," "seeks," "should," or "will" or the negative of these
terms or similar expressions are generally intended to identify forward-looking
statements. Because these forward-looking statements involve risks and
uncertainties, there are important factors that could cause actual results to
differ materially from those expressed or implied by these forward-looking
statements, including the factors discussed under "Risk Factors."

    NetRatings, NetRatings Insight, NetRatings Online Observer, BannerTrack and
CommerceTrack are trademarks for which we have applied for registration in the
United States. Other trademarks and trade names appearing in this prospectus are
the property of their respective holders.

    Until January 3, 2000, all dealers selling shares of the common stock,
whether or not participating in this offering, may be required to deliver a
prospectus. This is in addition to the obligation of dealers to deliver a
prospectus when acting as underwriters and with respect to their unsold
allotments or subscriptions.
<PAGE>
                               PROSPECTUS SUMMARY

    YOU SHOULD READ THE FOLLOWING SUMMARY TOGETHER WITH THE MORE DETAILED
INFORMATION REGARDING OUR COMPANY AND THE COMMON STOCK BEING SOLD IN THIS
OFFERING AND OUR FINANCIAL STATEMENTS AND NOTES TO THOSE STATEMENTS APPEARING
ELSEWHERE IN THIS PROSPECTUS.

    EXCEPT AS OTHERWISE INDICATED, ALL INFORMATION IN THIS PROSPECTUS ASSUMES
THAT THE UNDERWRITERS DO NOT EXERCISE THE OPTION GRANTED BY NETRATINGS TO
PURCHASE ADDITIONAL SHARES IN THIS OFFERING, THAT ALL OF OUR OUTSTANDING
PREFERRED STOCK IS CONVERTED INTO COMMON STOCK UPON THE CLOSING OF THIS
OFFERING, AND THAT A ONE-FOR-TWO REVERSE SPLIT OF OUR COMMON STOCK IS EFFECTED
BEFORE THE COMPLETION OF THIS OFFERING.

                                   NETRATINGS

    We provide Internet audience measurement information and analysis. Our
products and services enable our customers to make informed business-critical
decisions regarding their Internet strategies. We deliver accurate and timely
Internet audience information, collected from a representative sample of
Internet users, and augment this information with detailed, flexible reporting
and analysis. In order to provide our customers with the highest-quality
products and services, we have formed strategic relationships with Nielsen Media
Research, the leading source of television audience measurement and related
services in the United States and Canada, and ACNielsen, a leading provider of
market research information and analysis to the consumer products and services
industries. Through these relationships, we gain access to these companies'
proprietary sampling methodologies and marketing capabilities. Through our
relationship with Nielsen Media Research, we currently market our products and
services under the Nielsen//NetRatings brand in the U.S., Canada and Japan. In
addition, through our joint venture with ACNielsen, we intend to offer
Nielsen//NetRatings-branded Internet audience measurement services, based on
data collected from foreign-based panels of Internet users. We currently have
more than 170 customers, including leading e-commerce companies, advertising
agencies, media companies, Internet companies and financial institutions.

    We were incorporated in July 1997, began offering Internet audience
measurement services in March 1998 and began offering services under the
Nielsen//NetRatings brand in the quarter ended March 31, 1999. Accordingly, our
operating history and revenues derived from operations are limited. We incurred
net losses of $3.9 million for the year ended December 31, 1998 and
$10.7 million for the nine months ended September 30, 1999, and as of
September 30, 1999, we had an accumulated deficit of $16.3 million. We will
continue to incur significant capital and operating expenses over the next
several years in connection with our planned marketing efforts and expansion,
and we expect to continue to incur operating losses for the foreseeable future.

    As the Internet evolves and online advertising and electronic commerce
continue their dramatic growth, companies conducting business online are
continually challenged to define and reach their target audiences and to develop
increasingly sophisticated online business strategies. At the same time, the
Internet presents advertisers and online businesses with a unique global
opportunity to both target prospective consumers and to measure the return on
their advertising or marketing investment. Internet users visiting the same Web
page at the same moment can be presented with different advertisements based on
their Internet usage behavior. The Internet also makes it possible for an
advertiser or e-commerce company to track how its audience interacts with a
banner advertisement or an e-commerce site.

    The unique dynamics of the Internet require that online market participants
understand their markets and quickly recognize and adapt to changing conditions
in their particular industries. In order to remain competitive, these online
companies demand detailed audience measurement information and analysis that
will enable them to make informed business decisions in a timely manner. We
believe

                                       3
<PAGE>
that our product and service offering meets the needs of this market by
providing the following benefits:

    - ESTABLISHED SAMPLING METHODOLOGIES. Through our strategic relationships
      with Nielsen Media Research and ACNielsen, we provide independent
      information using established sampling methodologies to create
      statistically-representative groups of Internet users, referred to as
      panels.

    - PROPRIETARY MEASUREMENT TECHNOLOGY. Our proprietary activity tracking and
      data collection software gathers comprehensive and detailed information
      regarding Internet site and advertising activity as it occurs, in real
      time, and simultaneously transmits it over the Internet to our database.

    - POWERFUL, FLEXIBLE REPORTING SYSTEMS. We provide a variety of daily,
      weekly and monthly reports that can be modified by our customers, enabling
      them to easily manipulate data to meet specific information requirements.

    - MEANINGFUL ANALYSIS. We augment audience behavior information with
      meaningful analysis delivered on a daily, weekly or monthly basis,
      enabling our customers to take decisive strategic actions.

    - COMPATIBLE, PORTABLE ARCHITECTURE. All of our information is collected
      using proprietary software that is compatible with devices that operate on
      a Java-enabled platform permitting integration with many new Internet
      access devices.

    Our objective is to become the standard for Internet audience measurement
and the worldwide leader in Internet market research. The key elements of our
strategy include:

    - leveraging our strategic relationships by utilizing established audience
      sampling methodologies developed by Nielsen Media Research and ACNielsen
      and capitalizing on the brand recognition of these companies under the
      Nielsen//NetRatings brand;

    - increasing the size, scope and number of our audience measurement panels
      to enable us to offer more detailed and accurate information and analysis;

    - developing additional products, such as new types of reports or analytical
      services, to better enable our customers to evaluate Internet audience
      behavior as such behavior rapidly evolves, and entering new markets, such
      as analysis of business-to-business e-commerce activity, as their
      significance in the overall Internet marketplace increases;

    - expanding the Nielsen//NetRatings brand internationally to enable us to
      reach the large proportion of Internet users and Internet-related
      businesses that reside outside the U.S. and Canada; and

    - positioning ourselves to capitalize on the convergence of television and
      the Internet by capturing and analyzing Internet audience behavior on
      devices that deliver both Internet and television content, as well as
      Internet audience behavior involving combined Internet content and
      television programming.

    Our market is highly-competitive, and we face the risk that another
company's Internet audience measurement service will become the accepted
standard for Internet audience measurement services. Our future success is
subject to other significant risks and uncertainties, including the following:

    - We may not be successful in managing future growth of our business;

    - The Internet may not achieve broad acceptance as an effective advertising
      medium;

                                       4
<PAGE>
    - Nielsen Media Research may fail to maintain the quality of its audience
      sampling methodologies; and

    - We may not be successful in expanding our services to include measurement
      of audience behavior on new types of Internet access devices or at-work
      Internet audience behavior.

    We formed our joint venture with ACNielsen in September 1999. ACNielsen has
an 80.1% ownership interest in the joint venture, and we have a 19.9% interest.
ACNielsen has agreed to fund all of the venture's initial panel development
costs. After this initial stage, we may be required to either contribute
additional capital to the joint venture or to allow ACNielsen to dilute our
ownership interest by making such capital contributions unilaterally. Our plans
to expand internationally are substantially dependent on this joint venture. If
we encounter significant problems in our working relationship with ACNielsen, or
if the joint venture is ineffectively managed, our international expansion is
likely to fail.

    Nielsen Media Research has elected to exercise its right to purchase
additional shares of our common stock in a private placement following
expiration or early termination of the required waiting period under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, at the initial public
offering price, in an amount such that Nielsen Media Research will own 52% of
our issued and outstanding common stock as of the closing of this offering,
assuming the exercise of all outstanding options and warrants, including the
underwriters' over-allotment option. Nielsen Media Research has also agreed to
exercise its warrants to purchase 6,553,054 shares following this offering, at a
weighted average exercise price of $9.95 per share. We have agreed that, after
the exercise of these warrants, we will elect a number of Nielsen Media Research
representatives to our board of directors such that its representatives will
constitute a majority of our board. The number of shares to be purchased by
Nielsen Media Research will be increased to the extent that, at the time the
purchase is consummated, Nielsen Media Research would own less than a majority
of our then-outstanding common stock, assuming the exercise of all outstanding
options and warrants. After its purchase of additional shares, Nielsen Media
Research, as a majority stockholder, will have the ability to control the
election of our entire board of directors, and our directors, officers and their
affiliates, together with Nielsen Media Research, will beneficially own
approximately 83.3% of our outstanding common stock.

    Our principal executive offices are located at 830 Hillview Court,
Suite 225, Milpitas, CA 95035. Our telephone number is (408) 957-0699. We were
incorporated in Delaware on July 2, 1997. Our Web site address is
www.netratings.com. Information on our Web site does not constitute part of this
prospectus.

                                       5
<PAGE>
                                  THE OFFERING

<TABLE>
<S>                                                    <C>
Common stock offered by NetRatings...................  4,000,000 shares

Common stock to be outstanding after the offering....  14,872,280 shares

Use of proceeds......................................  For general corporate purposes, including
                                                       working capital and capital expenditures. See
                                                       "Use of Proceeds."

Proposed Nasdaq National Market symbol...............  NTRT
</TABLE>

    The number of shares of common stock to be outstanding after the offering is
based on the number of shares outstanding as of September 30, 1999, includes
353,471 shares issued upon the exercise of warrants after September 30, 1999 and
excludes:

    - 3,410,000 shares issuable under our 1998 Stock Plan, consisting of:

       - 1,722,000 shares issuable upon exercise of options outstanding as of
         September 30, 1999, with a weighted average exercise price of $2.04 per
         share;

       - 954,560 shares issuable upon exercise of options issued subsequent to
         September 30, 1999, with a weighted average exercise price of $9.87 per
         share; and

       - 733,440 shares available for future grants;

    - 15,160,600 shares to be issued and sold to Nielsen Media Research
      following expiration or early termination of the applicable
      Hart-Scott-Rodino waiting period, consisting of:

       - 8,607,546 shares to be sold in a private placement in connection with
         this offering; and

       - 6,553,054 shares issuable pursuant to warrants that Nielsen Media
         Research has agreed to exercise following the completion of this
         offering;

    - 83,468 shares issuable upon the exercise of warrants outstanding as of
      September 30, 1999, at a weighted average exercise price of $1.15 per
      share;

    - 43,293 shares issuable upon exercise of a warrant issued subsequent to
      September 30, 1999, with an exercise price of $6.24 per share; and

    - 250,000 shares available for issuance under our 1999 Employee Stock
      Purchase Plan.

    If the shares expected to be sold to Nielsen Media Research after this
offering are included, there will be 30,032,880 shares outstanding after the
offering.

                                       6
<PAGE>
                             SUMMARY FINANCIAL DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

    The following table summarizes financial data regarding our business and
should be read together with "Management's Discussion and Analysis of Financial
Condition and Results of Operations" and our financial statements and the
related notes included elsewhere in this prospectus. The financial results for
the nine months ended September 30, 1998 are unaudited.

<TABLE>
<CAPTION>
                                                                                    NINE MONTHS ENDED
                                          PERIOD FROM JULY 2,     YEAR ENDED          SEPTEMBER 30,
                                          1997 (INCEPTION) TO    DECEMBER 31,    -----------------------
                                           DECEMBER 31, 1997         1998           1998         1999
                                          --------------------   -------------   ----------   ----------
                                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                       <C>                    <C>             <C>          <C>
STATEMENT OF OPERATIONS DATA:
Revenue.................................         $    --            $   237       $   132      $ 1,486
Gross profit (loss).....................              --               (824)         (230)      (2,783)
Loss from operations....................          (1,787)            (3,768)       (2,301)     (10,645)
Net loss................................          (1,781)            (3,879)       (2,358)     (10,670)
Basic and diluted net loss per common
  share.................................         $ (2.03)           $ (2.78)      $ (1.79)     $ (5.19)
Shares used to compute basic and diluted
  net loss per common share.............             878              1,393         1,320        2,056
Pro forma basic and diluted net loss per
  common share..........................                            $ (1.67)      $ (1.04)     $ (2.31)
Shares used to compute pro forma basic
  and diluted net loss per common
  share.................................                              2,319         2,270        4,626
</TABLE>

    The following table provides a summary of our balance sheet as of
September 30, 1999. The as adjusted column reflects:

    - the sale of 4,000,000 shares of common stock in this offering at the
      initial public offering price of $17.00 per share, after deducting the
      underwriting discount and estimated offering expenses;

    - the exercise of warrants to purchase 706,950 shares of Series B redeemable
      convertible preferred stock and the automatic conversion of those shares
      into 353,471 shares of common stock; and

    - the conversion of 14,677,952 shares of redeemable convertible preferred
      stock, which are currently outstanding, into 6,626,476 shares of common
      stock.

<TABLE>
<CAPTION>
                                                              AS OF SEPTEMBER 30, 1999
                                                              -------------------------
                                                                ACTUAL      AS ADJUSTED
                                                              -----------   -----------
<S>                                                           <C>           <C>
BALANCE SHEET DATA:
Cash and cash equivalents...................................    $28,650       $91,337
Working capital.............................................     24,262        86,949
Total assets................................................     31,086        93,773
Current amounts due to Nielsen Media Research...............      2,164         2,164
Long-term debt and capital lease obligations, less current
  portion...................................................        320           320
Total stockholders' equity (deficit)........................    (10,728)       87,702
</TABLE>

    Giving effect to our anticipated sale of 15,160,600 shares of common stock
to Nielson Media Research, our cash and cash equivalents, as adjusted, would be
$302,847,000, our working capital, as adjusted, would be $298,459,000, our total
assets, as adjusted, would be $305,283,000 and our total stockholders' equity,
as adjusted, would be $299,212,000.

                                       7
<PAGE>
                                  RISK FACTORS

    ANY INVESTMENT IN OUR COMMON STOCK INVOLVES A SIGNIFICANT DEGREE OF RISK.
YOU SHOULD CAREFULLY CONSIDER THE FOLLOWING RISKS AS WELL AS THE OTHER
INFORMATION CONTAINED IN THIS PROSPECTUS. IF ANY OF THE FOLLOWING RISKS ACTUALLY
OCCUR, OUR BUSINESS WOULD BE HARMED, THE TRADING PRICE OF OUR COMMON STOCK COULD
DECLINE, AND YOU MAY LOSE ALL OR PART OF YOUR INVESTMENT.

WE HAVE INCURRED LOSSES SINCE INCEPTION AND WE MAY BE UNABLE TO ACHIEVE
PROFITABILITY

    We have experienced operating losses in each quarterly and annual period
since inception. We incurred net losses of $3.9 million for the year ended
December 31, 1998 and $10.7 million for the nine months ended September 30,
1999, and as of September 30, 1999, our accumulated deficit was $16.3 million.
We intend to make significant expenditures related to panel development and
maintenance, marketing, hiring of additional personnel and further development
of our technology and infrastructure. As a result, we will need to generate
significant revenue to achieve and maintain profitability. Although our revenue
has grown in recent periods, we may not be able to achieve significant revenue
growth in the future. Our operating results for future periods are subject to
numerous uncertainties, and we may not achieve sufficient revenue to become
profitable.

OUR LIMITED OPERATING HISTORY IN THE EVOLVING MARKET FOR INTERNET AUDIENCE
MEASUREMENT INCREASES THE POSSIBILITY THAT THE VALUE OF YOUR INVESTMENT WILL
DECLINE

    We were incorporated in July 1997 and did not start generating revenue until
the quarter ended March 31, 1998. We introduced our Nielsen//NetRatings Internet
audience measurement service in the quarter ended March 31, 1999. Accordingly,
we are still in the early stages of development and have only a limited
operating history upon which you can evaluate our business. You should evaluate
our likelihood of financial and operational success in light of the risks,
uncertainties, expenses, delays and difficulties associated with an early-stage
business in an evolving market, many of which may be beyond our control,
including:

    - the risk that a competing company's Internet audience measurement service
      will become the accepted standard for Internet audience measurement;

    - our potential inability to successfully manage any significant growth we
      achieve in the future;

    - our potential inability to develop our brand; and

    - the risks associated with our international expansion.

FLUCTUATIONS IN OUR QUARTERLY REVENUES AND OPERATING RESULTS MIGHT LEAD TO
REDUCED PRICES FOR OUR STOCK

    Due to our limited operating history and the evolving nature of the market
in which we compete, our future revenue is difficult to forecast. Factors that
may cause fluctuations in our revenues or operating results on a quarterly basis
include the following, many of which are beyond our control:

    - the amount and timing of operating costs and capital expenditures related
      to the expansion of our business;

    - the amount and timing of costs related to changes in the size or
      composition of our panel, particularly as a result of turnover among panel
      members;

    - changes in demand for our products and services due to the announcement or
      introduction of new products and services by us or our competitors;

    - changes in the pricing of our products and services in light of the
      services and pricing offered by our competitors;

                                       8
<PAGE>
    - the impact of possible acquisitions both on our operations and on our
      reported operating results due to associated accounting charges; and

    - technical difficulties or service interruptions that significantly harm
      our ability to deliver our products and services on schedule.

BECAUSE OUR EXPENSE LEVELS ARE BASED IN LARGE PART ON OUR ESTIMATES OF FUTURE
REVENUES, AN UNEXPECTED SHORTFALL IN REVENUE WOULD SIGNIFICANTLY HARM OUR
OPERATING RESULTS

    Our expense levels are based largely on our investment plans and estimates
of future revenue. We may be unable to adjust our spending to compensate for an
unexpected shortfall in revenue. Accordingly, any significant shortfall in
revenue relative to our planned expenditures in a particular quarter would harm
our results of operations and could cause our stock price to fall sharply,
particularly following quarters in which our operating results fail to meet the
expectations of securities analysts or investors.

THE MARKET FOR INTERNET AUDIENCE MEASUREMENT AND ANALYSIS IS HIGHLY COMPETITIVE,
AND IF WE CANNOT COMPETE EFFECTIVELY, OUR REVENUES WILL DECLINE

    The market for Internet audience measurement and analysis is new, rapidly
evolving and becoming increasingly competitive. In the market for Internet
audience measurement services, our principal competitor is Media Metrix, which
we believe to be the leading provider of Internet audience measurement services,
based on annual revenues. We are not aware of any other significant competitors
in this market, although we expect competition to intensify in the future. With
respect to the provision of analytical services, we compete with companies such
as Forrester Research, Gartner Group and Jupiter Communications that provide
Internet market research and industry analysis based on data derived from
surveys.

    We believe that the market for Internet audience measurement services will
eventually gravitate toward a uniform standard, based on data collected by a
single service provider, that will allow companies to make meaningful decisions
regarding online advertising. We therefore believe that one leading provider is
likely to emerge in the market for Internet audience measurement services. Media
Metrix has provided Internet audience measurement services since 1995 and, as
the "first mover" in this market, has a head start in becoming the industry
standard for such services.

    We believe that the principal competitive factors in our market are:

    - the development of independent, reliable measurement panels that are
      representative of the entire target audience;

    - the timeliness of reported results;

    - the breadth and depth of measurement services offered and their
      flexibility and ease of use;

    - the ability to provide quality analytical services derived from Internet
      audience measurement information;

    - the ability to offer products and services in international markets; and

    - pricing.

    Most of our competitors have longer operating histories, larger customer
bases, greater brand recognition and significantly greater financial and
marketing resources than we have. In addition, some of our competitors may be
able to:

    - devote greater resources to marketing and promotional campaigns;

    - adopt more aggressive pricing policies; or

                                       9
<PAGE>
    - devote more resources to technology and systems development.

In light of these factors, we may be unable to compete successfully in our
market.

WE ARE DEPENDENT ON NIELSEN MEDIA RESEARCH FOR THE DEVELOPMENT AND MAINTENANCE
OF PANELS OF INTERNET USERS IN THE UNITED STATES AND CANADA AND ON ACNIELSEN FOR
THE DEVELOPMENT AND MAINTENANCE OF SUCH PANELS IN INTERNATIONAL MARKETS

    Our audience measurement data is collected from randomly-selected groups of
Internet users that are generally referred to as audience measurement panels.
Our at-home Internet audience measurement panel in the United States is, and in
Canada will be, developed and maintained by Nielsen Media Research as part of
our strategic relationship with that company. Similarly, our Internet audience
measurement panels and other sampling methodologies which we intend to employ in
geographic locations outside of the United States, Canada and Japan will be
developed and maintained by ACNielsen as part of our joint venture with that
company. Any failure on the part of Nielsen Media Research or ACNielsen to
devote adequate resources to the development or maintenance of such panels or
other sampling methodologies, or to maintain the overall quality of these
methodologies, will harm our business. In October 1999, Nielsen Media Research
was acquired by VNU N.V., a Netherlands-based international publishing company.
Should this acquisition result in significant changes in the composition of
Nielsen Media Research's management team or its business strategies, our
relationship with Nielsen Media Research could be harmed. In addition, Nielsen
Media Research may terminate its obligations with respect to Internet audience
measurement panels in the event it no longer holds at least 5% of our
outstanding stock on a fully-diluted basis.

WE EXPECT NIELSEN MEDIA RESEARCH TO ACQUIRE A MAJORITY OF OUR OUTSTANDING STOCK
AFTER THE COMPLETION OF THIS OFFERING AND TO CONTROL A MAJORITY OF OUR BOARD OF
DIRECTORS

    In connection with this offering Nielsen Media Research will exercise its
right to purchase additional shares of our common stock, pursuant to which we
expect it to purchase 8,607,546 shares from us and 580,293 shares from other
stockholders. Nielsen Media Research has also agreed to exercise its warrants to
purchase 6,553,054 shares of our common stock, after which it will own a
majority of our outstanding stock. If it exercises these purchase rights in
full, Nielsen Media Research will have sufficient voting power to control the
direction and policies of NetRatings, including the election of our board of
directors, amendment of our certificate of incorporation and decisions regarding
mergers, consolidations, and the sale of all or substantially all of our assets.
We have agreed that, after Nielsen Media Research exercises its purchase rights,
we will elect a number of Nielsen Media Research representatives to our board of
directors such that its representatives will constitute a majority of our board.
This control may have the effect of discouraging certain types of transactions
involving a change of control, including transactions in which the other holders
of our common stock might otherwise receive a premium for their shares over the
then current market price.

AFTER NIELSEN MEDIA RESEARCH ACQUIRES A MAJORITY OF OUR OUTSTANDING STOCK, IT
COULD USE ITS MAJORITY OWNERSHIP POSITION TO ALTER OUR STRATEGIC RELATIONSHIP
WITH NIELSEN MEDIA RESEARCH TO THE DETRIMENT OF OUR OTHER STOCKHOLDERS

    Nielsen Media Research's majority stock ownership position and its control
of our board of directors will enable it to control or influence the terms of
our important commercial transactions, including our strategic relationship with
Nielsen Media Research. Nielsen Media Research will have a conflict of interest
with respect to the administration and potential future alteration of this
strategic relationship. It is possible that future actions taken by Nielsen
Media Research may adversely affect our other stockholders. For example Nielsen
Media Research could take actions which would increase the number of our
customers for whom it is entitled to receive sales commissions, increase the
amount paid to Nielsen Media Research for maintenance of audience measurement
panels, decrease the sales

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goals that Nielsen Media Research must achieve in order to prevent us from
selling advertising expenditure measurement data from third parties, or take
other action detrimental to our other stockholders.

BECAUSE THE CORPORATE PARENT OF NIELSEN MEDIA RESEARCH WILL BE REQUIRED TO
CONSOLIDATE OUR OPERATING RESULTS WITH ITS OWN, NIELSEN MEDIA RESEARCH
MAY ATTEMPT TO INFLUENCE OUR EXPENDITURES IN ORDER TO LIMIT OUR LOSSES IN THE
SHORT TERM TO THE DETRIMENT OF OUR LONG-TERM STRATEGIES

    During any time that Nielsen Media Research is a majority stockholder, its
parent company, VNU N.V., will be required to consolidate our operating results
with its own for financial reporting purposes. Our business strategy will
require us to incur significant losses as we attempt to establish our brand by
increasing our marketing efforts and establishing strategic relationships.
Incurring large expenses for these purposes may conflict with the interests of
VNU in maximizing its net earnings, and VNU, acting through Nielsen Media
Research's representatives on our board, may therefore attempt to influence our
expenditures in order to limit our losses in the short term to the detriment of
our long-term strategies.

THE EXERCISE BY NIELSEN MEDIA RESEARCH OF ITS PURCHASE RIGHTS IS SUBJECT TO
SCRUTINY BY FEDERAL ANTITRUST REGULATORS, AND IF NIELSEN MEDIA RESEARCH IS
PREVENTED FROM PURCHASING ADDITIONAL SHARES FROM US, WE WILL NOT RECEIVE THE
$211.5 MILLION IN PROCEEDS THAT WE EXPECT FROM THE SALE OF THESE ADDITIONAL
SHARES AND COULD, AS A RESULT, BE REQUIRED TO SEEK ADDITIONAL FINANCING IN THE
FUTURE

    The exercise by Nielsen Media Research of its warrants and other purchase
rights is subject to the expiration or early termination of the required waiting
period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 and
associated regulations. Under this law, the proposed investment by Nielsen Media
Research may not proceed until federal antitrust regulators at the Federal Trade
Commission or the Department of Justice have had an opportunity to review the
transaction to determine whether it may have an anticompetitive effect. The
antitrust regulators may grant early termination of the required waiting period,
may allow the waiting period to expire without further action or may formally
request additional information. A formal request for additional information
would significantly delay the transaction, possibly for many months, or could
prevent the transaction from occurring altogether. If the antitrust regulators
find that the proposed investment is anticompetitive, they could impose
conditions on the transaction such as a divestiture of other assets by Nielsen
Media Research. In the event Nielsen Media Research is unable to exercise its
purchase rights prior to February 1, 2000, then it will have the right to cancel
its exercise of these rights.

    If the transaction cannot proceed, our proceeds from this offering will be
limited to the approximately $62.2 million we will receive from the sale of
shares to the public, assuming the underwriters do not exercise their
over-allotment option, as opposed to the approximately $273.7 million we would
receive from the combined transactions if Nielsen Media Research is permitted to
exercise its stock purchase rights in full. Such circumstances would greatly
increase the likelihood that we would need to raise additional funds through
public or private debt or equity financing.

WE CANNOT FORECAST THE RATE AT WHICH SUBSCRIPTIONS FOR OUR SERVICES MAY BE
RENEWED, AND WE MAY NOT ACHIEVE SUFFICIENTLY-HIGH RENEWAL RATES TO BECOME
PROFITABLE

    We derive substantially all of our revenue from annual subscriptions for our
services. As our business becomes more established, we expect subscription
renewals to account for an increasing proportion of our revenue. Any
unexpectedly-low renewal rates would harm our operating results and could
prevent us from becoming profitable. Because of our limited operating history,
our historical renewal rates are not meaningful, and accordingly, we have no
historical basis for projecting the rate at which our customers will renew their
subscriptions. Additionally, because most Internet-related businesses are still
in the early stages of development, consolidations in our customer base or the

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failure of a significant number of our customers could cause a decline in
renewal rates for our products and services.

WE MAY NOT BE SUCCESSFUL IN DEVELOPING OUR BRAND, WHICH COULD PREVENT US FROM
REMAINING COMPETITIVE

    We believe that our future success will depend on our ability to maintain
and strengthen the Nielsen//NetRatings brand, which will depend, in turn,
largely on the success of our marketing efforts and our ability to provide our
customers with high-quality products. To promote the Nielsen// NetRatings brand,
we intend to increase our marketing expenses, and we may incur other types of
expenses in order to create and maintain brand loyalty among our clients.
However, we cannot assure you that our efforts will succeed in maintaining and
strengthening our brand. If we fail to successfully promote and maintain our
brand, or incur excessive expenses attempting to promote and maintain our brand,
our business will be harmed.

OUR BRAND IS DEPENDENT ON THE REPUTATIONS OF THIRD PARTIES OVER WHICH WE HAVE NO
CONTROL

    The strength of the Nielsen//NetRatings brand is also closely dependent on
the reputations of Nielsen Media Research and ACNielsen and the strength of
their brands. Therefore, any negative publicity generated by Nielsen Media
Research or ACNielsen, whether or not directly related to any
Nielsen//NetRatings-branded products or services, as well as any erosion of the
strength of either of their brands, will adversely affect our own brand
identity.

COSTS TO DEVELOP AND MAINTAIN ACCURATE AUDIENCE MEASUREMENT PANELS ARE
SIGNIFICANT AND MAY INCREASE

    The expense of recruiting and maintaining our audience measurement panels
comprises substantially all of the cost of revenue reported on our financial
statements and, therefore, any increase in this expense will result in a
corresponding decrease in our gross margin. We believe that the expansion of the
number of our panels as well as the size and scope of our panels is critical to
the success of our business. This expansion is likely to increase our expenses
for recruiting and maintaining our panels. The costs of recruiting and
maintaining our panels are dependent on many factors beyond our control,
including the cooperation rate of potential panel members and turnover among
existing panel members, and accordingly we cannot control these costs to match
increases or decreases in revenue. To the extent that such additional expenses
are not accompanied by increased revenue, our results of operations will be
harmed. During 1999, the cooperation rate of potential panel members has been
slightly over 50%, based on the number of households that have agreed to join
our panel compared to the number of households we have contacted that have
Internet access. Historically, approximately 1% of our panel members have
dropped out of the panel each month. Notwithstanding our historical cooperation
and turnover rates, we have limited experience in developing Internet panels,
and we could experience lower cooperation rates or higher turnover rates in the
future.

THE DEVELOPMENT OF HIGH-QUALITY AT-WORK MEASUREMENT PANELS IS PARTICULARLY
DIFFICULT, AND IF WE ARE UNABLE TO DEVELOP SUCH A PANEL, WE MAY BE UNABLE TO
COMPETE WITH OTHER INTERNET AUDIENCE MEASUREMENT SERVICES

    A significant percentage of Internet usage takes place at the workplace, and
as such, our customers are increasingly requiring audience measurement
information from this user segment. In order to measure and analyze this usage,
we must develop high-quality panels of at-work Internet users. Our principal
competitor, Media Metrix, currently has an at-work panel. In September 1999, we
began the development of our initial at-work measurement panel, from which we
recently began collecting data, and expect to recruit more than 3,000 panel
members by the end of 1999. However, we may encounter difficulties in the
development of these panels. Participation in our audience measurement panels
requires that the panel member install our data collection software on the
member's PC. Information

                                       12
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technology managers are often reluctant to permit employees to install software
obtained outside the workplace due to concerns about exposing the employer's
network to computer viruses and concerns about incompatibilities between such
software and the existing configuration of hardware and software on employees'
personal computers. Employers may also object to their employees providing us
with data regarding their Internet usage because such data could compromise the
confidentiality of sensitive activities that involve Internet research.

WE MAY NOT BE ABLE TO RECRUIT OR RETAIN QUALIFIED PERSONNEL

    Our future success depends on our ability to attract, retain and motivate
highly skilled employees. Competition for employees in Internet-related
industries, particularly management, technical, sales and marketing personnel,
is intense. Although we provide compensation packages that include stock
options, cash incentives and other employee benefits, and although we have
experienced no significant turnover to date, we may be unable to retain our key
employees or to attract, assimilate and retain other highly qualified employees
in the future, which would harm our business.

OUR PLANNED INTERNATIONAL EXPANSION COULD FAIL

    Our current strategy includes expansion of our services to measure Internet
audiences outside the United States and Canada. Through our joint venture with
ACNielsen, we plan to develop audience measurement panels in Australia, Ireland,
New Zealand and the United Kingdom in the first half of 2000 and in Austria,
Denmark, Finland, France, Germany, Norway and Sweden by the end of 2000. Our
expansion into international markets will require management attention and
resources. In addition, there can be no assurance of the continued growth of
Internet usage in international markets. The international markets for audience
measurement services have historically been localized and difficult to
penetrate. The success of our international expansion will depend on our ability
to:

    - recruit and maintain at-home and at-work panels that are representative of
      a geographic area;

    - control costs and effectively manage foreign operations; and

    - effectively develop, market and sell new products and services in new,
      unfamiliar markets.

    In addition, if we are successful in establishing our international
operations, we will be subject to a number of inherent risks, including:

    - changes in regulatory requirements;

    - deficiencies in the telecommunications infrastructure in some countries;

    - reduced protection for intellectual property rights in some countries;

    - more rigorous levels of privacy protection in some countries;

    - potentially adverse tax consequences;

    - economic and political instability; and

    - fluctuations in currency exchange rates.

THE SUCCESS OF OUR INTERNATIONAL EXPANSION WILL BE LARGELY DEPENDENT ON THE
EFFORTS OF ACNIELSEN AND OUR WORKING RELATIONSHIP WITH ACNIELSEN

    The challenges we face in expanding internationally require skills and
expertise in foreign countries that we do not currently have. To enable us to
expand globally in a rapid timeframe, we have entered into a joint venture with
ACNielsen, which will control 80.1% of the joint venture. ACNielsen has agreed
to fund all of the venture's panel development costs in the countries initially
targeted by the joint venture, which will be determined by an operating
committee consisting of two representatives of NetRatings and two
representatives of the joint venture corporation. After this initial stage,
however,

                                       13
<PAGE>
we may be required to either contribute additional capital to the joint venture
or to allow ACNielsen to make such capital contributions unilaterally with
resulting dilution of our ownership interest in the venture. Moreover, because
the initial countries targeted by the joint venture have not yet been determined
by the operating committee, we cannot predict what proportion of overall panel
development costs we will be required to contribute. Accordingly, we could be
subject to unanticipated costs or dilution of our ownership interest as a result
of actions by the operating committee to limit the countries that are part of
the initial roll-out of the joint venture's operations. Furthermore, if we
encounter significant problems in our working relationship with ACNielsen, or if
our joint venture is ineffectively managed, our international expansion is
likely to fail.

WE MIGHT NOT BE SUCCESSFUL IN THE DEVELOPMENT OR INTRODUCTION OF NEW PRODUCTS
AND SERVICES TO KEEP UP WITH THE PROLIFERATION OF ALTERNATIVE INTERNET ACCESS
DEVICES AND TECHNOLOGIES RELATED TO THE EXPECTED CONVERGENCE OF THE INTERNET AND
TELEVISION

    We believe that an increasing proportion of Internet use will involve
alternative Internet access devices such as Web-enabled phones and that there
will eventually be a convergence of Internet content and television programming.
Accordingly, in order to continue to provide information about audience behavior
throughout all major segments of the Internet, we will be required to develop
new products and services that address these evolving technologies. We may be
unsuccessful in identifying new product and service opportunities or in
developing or marketing new products and services in a timely or cost-effective
manner. In addition, product innovations may not achieve the market penetration
or price stability necessary for profitability. Finally, we may not be
successful in adapting our data collection software to evolving types of
Internet access devices or content. If we are unable to provide audience
measurement information regarding any significant segments of Internet use,
demand for our product and service offerings may suffer.

BECAUSE THE INTERNET AUDIENCE MEASUREMENT INDUSTRY IS IN ITS INFANCY, THE
PRICING AND ACCEPTANCE OF OUR PRODUCTS AND SERVICES IS UNCERTAIN

    Because our industry is still in its infancy, the pricing of our products
and services is subject to rapid and frequent change. We may be forced for
competitive or technical reasons to reduce prices for some of our products or
services or to offer them free of charge. Such circumstances would reduce our
revenue and could harm our business. Additionally, our market is still evolving,
and we have little basis to assess demand for different types of products or
services or to evaluate whether our products and services will be accepted by
the market. If our products and services do not gain broad market acceptance,
our business may fail.

THE ACCEPTANCE AND EFFECTIVENESS OF INTERNET ADVERTISING IS UNCERTAIN, AND IF
THE MARKET FOR INTERNET ADVERTISING FAILS TO DEVELOP OR DEVELOPS MORE SLOWLY
THAN WE EXPECT, OUR BUSINESS WILL SUFFER

    Our future success will depend in part on an increase in the use of the
Internet as an advertising medium. The Internet advertising market is new and
rapidly evolving, and the effectiveness of Internet advertising is uncertain. As
a result, there is also uncertainty about the demand and market acceptance for
Internet advertising. Many of our current or potential customers have little or
no experience using the Internet for advertising purposes. The adoption of
Internet advertising, particularly by entities that have historically relied on
traditional media for advertising, requires the acceptance of a new way of
conducting business. These companies may find Internet advertising to be less
effective than traditional advertising for promoting their products and
services. In addition, most current and potential publishers of content on the
Internet have little or no experience in generating revenue from the sale of
advertising space on their Internet sites. Because of the foregoing factors,
among others, the market for Internet advertising may not continue to emerge or
become sustainable. If the market for Internet advertising fails to develop or
develops more slowly than we expect, our business will suffer.

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<PAGE>
FOLLOWING THIS OFFERING, OUR OFFICERS, DIRECTORS AND PRINCIPAL STOCKHOLDERS WILL
BENEFICIALLY OWN 83.3% OF OUR COMMON STOCK AND, ACCORDINGLY, MAY EXERT
SUBSTANTIAL INFLUENCE OVER US

    Our executive officers and directors and entities affiliated with them,
including Nielsen Media Research, will, in the aggregate, beneficially own
approximately 83.3% of our common stock following this offering, assuming that
Nielsen Media Research exercises its warrants and other purchase rights in
connection with this offering and that the shares purchased by Nielsen Media
Research include 580,293 shares sold by other stockholders in lieu of shares
issued by us. These stockholders acting together will have the ability to
control all matters requiring approval by our stockholders. These matters
include the election and removal of directors and any merger, consolidation or
sale of all or substantially all of our assets. In addition, they may dictate
the management of our business and affairs. This concentration of ownership
could have the effect of delaying, deferring or preventing a change in control,
or impeding a merger or consolidation, takeover or other business combination.

A SALE BY NIELSEN MEDIA RESEARCH OF ITS STAKE IN NETRATINGS COULD ADVERSELY
AFFECT OUR STOCK PRICE AS A RESULT OF A CHANGE IN CONTROL OF NETRATINGS

    Other than a 180-day lock-up agreement entered into with the underwriters,
there are no contractual restrictions on the ability of Nielsen Media Research
to sell shares of our common stock, although sales in the public market will be
subject to the volume limitations of SEC Rule 144. Pursuant to these volume
limitations, a controlling stockholder may sell shares under Rule 144 only if
the shares to be sold, together with the shares sold during the past three
months, do not exceed the greater of 1% of the issuer's outstanding shares or
the average weekly trading volume of the issuer's shares during the preceding
four calendar weeks. Nielsen Media Research and several of our other
stockholders have the right, under certain circumstances, to require us to
register their stock for sale on the public market. Should Nielsen Media
Research decide to sell its stake in NetRatings, it could adversely affect our
stock price. Additionally, as a majority stockholder, Nielsen Media Research
will have the ability to transfer control of NetRatings, possibly at a premium
over the then-current market price. Because Nielsen Media Research will have the
ability to effect such a transfer of control unilaterally, other stockholders
could be denied an opportunity to participate in the transaction and receive a
premium for their shares.

NIELSEN MEDIA RESEARCH'S AUDIENCE MEASUREMENT SERVICES MAY EVENTUALLY HAVE
FEATURES THAT OVERLAP WITH FEATURES OF OUR INTERNET AUDIENCE MEASUREMENT
SERVICES AS A RESULT OF CONVERGENCE OF TELEVISION AND THE INTERNET

    Nielsen Media Research's principal business consists of providing television
audience measurement services based on audience panels that it develops
independent of its strategic relationship with us. If television and the
Internet converge in the future as expected, any Internet audience information
that is reported by Nielsen Media Research's television audience measurement
services may overlap with the audience information that is reported by the
Nielsen//NetRatings Internet audience measurement services. In the event of such
overlap, Nielsen Media Research's services could begin competing with our
services for the same research budgets among customers in the marketplace, and
its offering of such services could conflict with its obligation to develop and
maintain our Internet audience panels.

OUR BUSINESS MAY BE HARMED IF WE SUPPLY INACCURATE INFORMATION TO OUR CUSTOMERS

    If we furnish inaccurate information to our customers, our brand may be
harmed. The information in our databases, like that in any database, may contain
inaccuracies that our customers may not accept. Any dissatisfaction by our
customers with our measurement methodologies or databases could have an adverse
effect on our ability to attract new customers and retain existing customers and
could ultimately harm our brand. Our customer contracts generally provide that
each customer must indemnify us for any damages arising from the use of data,
reports or analyses by the customer or the

                                       15
<PAGE>
performance of any consulting, analytic or other services by us. However, we
cannot be certain that our contract provisions provide sufficient protection.
Any liability that we incur or any harm to our brand that we suffer because of
irregularities or inaccuracies in the data we supply to our customers could harm
our business. To date, we have not been notified of any liability claims or
customer dissatisfaction relating to such problems with our data.

OUR BUSINESS COULD SUFFER IF WE LOSE THE SERVICES OF ANY OF OUR EXECUTIVE
OFFICERS

    Our future success depends to a significant extent on the continued service
of our executive officers, who currently consist of David J. Toth, Charles L.
("Tim") Meadows, Simon Chen, Jack R. Lazar and Frank Sammann. The loss of the
services of any of our executive officers could harm our business. We have no
employment agreements with any of our key personnel, and should we enter into
such agreements in the future, they may be ineffective in preventing a key
employee from leaving our company.

SYSTEM FAILURES OR DELAYS MAY HARM OUR BUSINESS, AND OUR FACILITIES AND INTERNAL
COMPUTER OPERATIONS ARE VULNERABLE TO NATURAL DISASTERS AND OTHER UNEXPECTED
LOSSES

    Our success depends on the efficient and uninterrupted operation of our
computer and communications systems. A failure of our network could impede the
processing of data, customer orders and day-to-day management of our business
and could result in the corruption or loss of data. To date, we have not
experienced any significant system failures.

    Our internal computer operations are located in leased facilities in San
Jose, California, in an area that is susceptible to earthquakes. We do not have
a backup facility to provide redundant network capacity in the event of a system
failure. Accordingly, if this location experienced a system failure, our online
services would become unavailable to our customers until we were able to bring
an alternative facility online, a process which could take several weeks. These
systems are also vulnerable to damage from fire, floods, power loss,
telecommunications failures, break-ins and similar events. If we seek to
replicate our systems at other locations, we will face a number of technical
challenges, particularly with respect to database replications, which we may not
be able to address successfully. Although we carry property and business
interruption insurance, our coverage may not be adequate to compensate us for
all losses that may occur. Our servers may also be vulnerable to computer
viruses, physical or electronic break-ins and similar disruptions.

A DELAY OR DISCONTINUATION OF OUR SERVER HOSTING SERVICE COULD HARM OUR BUSINESS

    The servers on which we collect panel members' data are maintained by
AboveNet at its facilities located in San Jose, California. AboveNet continually
monitors our current utilization rate and the extent of our system capacity
needs. We believe we are currently operating at utilization levels that do not
require additional capacity. Accordingly, our ability to collect Internet
audience data in real time is dependent upon the efficient and uninterrupted
operation of AboveNet's computer and communications hardware and software
systems. Despite any precautions we may take, the occurrence of a natural
disaster or other unanticipated problems at AboveNet's facility could result in
interruptions in the flow of data to our servers. In addition, any failure by
AboveNet to provide our required data communications capacity could result in
interruptions in our service. In the past, we have experienced occasional minor
interruptions in service from AboveNet, although we have never experienced a
significant interruption in service. In the event of a delay in the delivery of
data from AboveNet, or if AboveNet should discontinue its services to us, we
would be required to transfer our data collection operations to an alternative
provider of server hosting services. Such a transfer could result in significant
delays in our ability to deliver our products and services to our customers,
which could damage our reputation and harm our business.

                                       16
<PAGE>
WE ARE SUBJECT TO A PENDING LEGAL PROCEEDING

    On November 4, 1999, PaineWebber Incorporated filed a lawsuit against us in
the Supreme Court of the State of New York for the County of New York. The suit
involves an agreement entered into in May 1999 in which we engaged PaineWebber
to act as our financial advisor with respect to a potential strategic
transaction. The specific transaction for which PaineWebber was engaged was not
consummated. However, the lawsuit alleges that we have breached our obligations
under the agreement by failing to pay PaineWebber a fee based upon our
subsequent sale of equity securities to Nielsen Media Research and by failing to
retain PaineWebber as a managing underwriter for this offering. The complaint
seeks damages in the aggregate amount of not less than $1.9 million and
reimbursement for PaineWebber's attorneys' fees relating to the dispute. We
intend to defend the lawsuit vigorously. We expect to incur substantial legal
fees and expenses in connection with the litigation, and it may also result in
the diversion of our internal resources. As a result, our defense of this
litigation, regardless of its eventual outcome, will likely be costly and time
consuming. The litigation is in the preliminary stage, and we are unable to
predict its final outcome. However, an adverse outcome could materially affect
our results of operations and financial position.

WE MAY BE UNABLE TO ADEQUATELY PROTECT OUR INTELLECTUAL PROPERTY RIGHTS

    We regard our intellectual property as critical to our success. We rely on
patent, trademark, copyright and trade secret laws to protect our proprietary
rights. Notwithstanding these laws, we may be unsuccessful in protecting our
intellectual property rights or in obtaining patents or registered trademarks
for which we apply. We have applied for U.S. patents with respect to our
BannerTrack advertising tracking technology. We have applied to register the
NetRatings, NetRatings Insight, NetRatings Online Observer, BannerTrack and
CommerceTrack trademarks in the United States. We have not undertaken any
actions to protect our trademarks, servicemarks or tradenames outside of the
United States, nor have we registered our copyrights. Our patent applications or
trademark registrations may not be approved or, even if approved, could be
challenged by others or invalidated through administrative process or
litigation. If our patent applications or trademark registrations are not
approved because third parties own rights to the technology we are trying to
patent or the trademarks we are trying to register, our use of such technology
or trademark would be restricted unless we enter into arrangements with the
third-party owners, which might not be possible on commercially reasonable terms
or at all.

WE MIGHT FACE INTELLECTUAL PROPERTY INFRINGEMENT CLAIMS THAT MIGHT BE COSTLY TO
RESOLVE

    We may from time to time be subject to claims of infringement of other
parties' proprietary rights or claims that our own trademarks, patents or other
intellectual property rights are invalid. To date, we have not been subject to
any such claims. However, any claims of this type, with or without merit, could
be time-consuming to defend, result in costly litigation, divert management
attention and resources or require us to enter into royalty or license
agreements. License agreements may not be available on reasonable terms, if at
all, and the assertion or prosecution of any infringement claims could
significantly harm our business.

WE MIGHT NEED ADDITIONAL CAPITAL IN THE FUTURE, AND SUCH ADDITIONAL CAPITAL
MIGHT NOT BE AVAILABLE UPON ACCEPTABLE TERMS

    We believe that our existing balances of cash and cash equivalents, together
with the net proceeds from this offering and our available credit facilities,
will be sufficient to meet our cash needs for working capital and capital
expenditures for at least the next 18 months. Without the proceeds of this
offering, we believe that these resources will be sufficient to meet our cash
needs for working capital and capital expenditures for at least the next 12
months. We may need to raise additional funds through public or private debt or
equity financing if we were to experience greater-than-expected losses

                                       17
<PAGE>
from operations, particularly if Nielsen Media Research is unable to consummate
its purchase of additional shares of our common stock, or if we decide to:

    - take advantage of opportunities, including more rapid international
      expansion or acquisitions of complementary businesses or technologies;

    - develop new products or services; or

    - respond to competitive pressures.

Any additional financing we may need may not be available on terms favorable to
us, if at all. If we raise additional funds through the sale of equity or
convertible debt securities, your percentage ownership of our company will be
reduced, and the value of your stock may be diluted. Additionally, we may have
to issue securities that may have rights, preferences and privileges senior to
our common stock. If adequate funds are not available or are not available on
acceptable terms, we might not be able to take advantage of unanticipated
opportunities, develop new products or services, or otherwise respond to
unanticipated competitive pressures, and our business could be harmed.

ANY MISAPPROPRIATION OF PERSONAL INFORMATION ABOUT OUR PANELISTS THAT IS STORED
ON OUR COMPUTERS COULD HARM OUR REPUTATION OR EXPOSE US TO CLAIMS ARISING FROM
DAMAGES SUFFERED BY THOSE PANELISTS

    Personal information regarding our panelists is included in the data that
our software captures from a panelist's Internet use. Our panel data are
released only in an aggregated format or in a form that is not identifiable on
an individual basis. However, if a person were to penetrate our network security
or otherwise misappropriate sensitive data about our panel members, our
reputation could be harmed or we could be subject to claims or litigation
arising from damages suffered by panel members as a result of such
misappropriation.

ANY ACQUISITIONS THAT WE UNDERTAKE COULD BE DIFFICULT TO INTEGRATE, DISRUPT OUR
BUSINESS, DILUTE STOCKHOLDER VALUE OR HARM OUR OPERATING RESULTS

    We may acquire or make investments in complementary businesses,
technologies, services or products if appropriate opportunities arise. The
process of integrating any acquired business, technology, service or product
into our business and operations may result in unforeseen operating difficulties
and expenditures. Integration of an acquired company also may consume much of
our management's time and attention that would otherwise be available for
ongoing development of our business. Moreover, the anticipated benefits of any
acquisition may not be realized. We currently do not have any understandings,
commitments or agreements with respect to any acquisition, and we are not
currently pursuing any acquisition. We may be unable to identify, negotiate or
finance future acquisitions successfully, or to integrate successfully any
acquisitions with our current business. Future acquisitions could result in
potentially dilutive issuances of equity securities or the incurrence of debt,
contingent liabilities or amortization expenses related to goodwill and other
intangible assets, any of which could harm our business.

DEMAND FOR OUR PRODUCTS AND SERVICES MIGHT DECREASE IF GROWTH IN THE USE OF THE
INTERNET OR E-COMMERCE DECLINES

    Our future success depends in part upon the continued growth in the use of
the Internet or e-commerce. Rapid growth in the use of the Internet and
e-commerce is a recent phenomenon and may not continue, or the Internet may not
be adopted as a medium of commerce by a broad base of consumers. If the Internet
does not continue to grow, or if e-commerce is not adopted as a medium of
commerce by a broad base of consumers, our business may not grow or may grow at
a slower rate.

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<PAGE>
GOVERNMENTAL REGULATION OF THE INTERNET MIGHT HARM OUR BUSINESS

    The applicability to the Internet of existing laws governing issues such as
property ownership, libel and personal privacy is uncertain. In addition,
governmental authorities in various countries may seek to further regulate the
Internet with respect to issues such as user privacy, pornography, acceptable
content, e-commerce, taxation, and the pricing, characteristics and quality of
products and services. Finally, the global nature of the Internet could subject
us to the laws of a foreign jurisdiction in an unpredictable manner. Any new
legislation regulating the Internet could inhibit the growth of the Internet and
decrease the acceptance of the Internet as a communications and commercial
medium, which might harm our business.

TELEPHONE CARRIERS MAY PERSUADE THE GOVERNMENT TO REGULATE THE INTERNET AND
IMPOSE USAGE FEES ON INTERNET SERVICE PROVIDERS, WHICH COULD IMPEDE THE GROWTH
OF THE INTERNET

    The growing use of the Internet has burdened the existing telecommunications
infrastructure and has caused interruptions in telephone service. Telephone
carriers have petitioned the government to regulate the Internet and impose
usage fees on Internet service providers. Any regulations of this type could
increase the costs of using the Internet and impede its growth, which could in
turn decrease the demand for our services or otherwise harm our business.

POTENTIAL YEAR 2000 RISKS MIGHT HARM OUR BUSINESS

    Many existing computer programs and installed computer systems include
computer code that uses only two digits to identify a year. These systems could
fail to function or produce delayed or erroneous results if they interpret "00"
to mean 1900 rather than 2000. As a result of this problem, commonly referred to
as the "year 2000" problem, older computer programs or systems may need to be
upgraded or replaced. Any failure of our internal systems or the PCs from which
our panel members access the Internet could harm our business.

    We rely on third-party equipment and software that may not be year 2000
compliant. The failure of such equipment or software to properly process dates
for the year 2000 could cause us to incur unanticipated expenses. In addition,
PCs used by our panel members to access the Internet may not be year 2000
compliant. As a result, we may encounter difficulties in gathering and
accurately measuring data from our panel, or data collected from some of these
users may contain inaccuracies.

    In light of our evaluation of the risks of any year 2000 problems we are
likely to encounter and the available alternatives for preparing for these
risks, we have not developed a contingency plan to address such risks, and we do
not intend to implement any such contingency plan.

MANAGEMENT WILL HAVE DISCRETION OVER THE USE OF THE PROCEEDS OF THIS OFFERING,
HAS NO SPECIFIC PLANS FOR THOSE PROCEEDS AND COULD SPEND OR INVEST THOSE
PROCEEDS IN WAYS WITH WHICH INVESTORS MIGHT NOT AGREE

    The net proceeds to us from this offering are estimated to be approximately
$62.2 million after deducting the underwriting discount and estimated offering
expenses. We currently have no specific plans for our net proceeds from this
offering. Consequently, our management will have the discretion to allocate the
net proceeds to uses that some stockholders may not deem desirable. Management's
allocation of the proceeds of this offering may not benefit our business, and we
may not be able to obtain a significant return on any use of the proceeds of
this offering.

FUTURE SALES OF SHARES BY EXISTING STOCKHOLDERS COULD AFFECT OUR STOCK PRICE

    Sales of substantial amounts of our common stock in the public market after
this offering could reduce the prevailing market prices for our common stock. Of
the 14,872,280 shares of common stock to be outstanding upon the closing of this
offering, the 4,000,000 shares offered hereby will be freely tradable without
restriction or further registration, other than shares purchased by our
officers,

                                       19
<PAGE>
directors or other "affiliates" within the meaning of Rule 144 under the
Securities Act of 1933, which will be restricted from sale until 180 days after
the date of this prospectus pursuant to agreements between these affiliates and
the underwriters. The remaining 10,872,280 shares of our common stock held by
existing stockholders upon the completion of this offering will become eligible
for resale in the public market as follows:

<TABLE>
<CAPTION>
   NUMBER OF SHARES/PERCENT
OUTSTANDING AFTER THE OFFERING          DATE WHEN SHARES BECOME AVAILABLE IN THE PUBLIC MARKET
- ------------------------------         ---------------------------------------------------------
<C>                                    <S>
       3,902,124/26.2%                 180 days after the date of this prospectus pursuant to
                                       agreements between the stockholders and the underwriters
                                       or NetRatings, provided that the underwriters can waive
                                       this restriction at any time. 3,127,500 of these shares
                                       will also be subject to sales volume restrictions under
                                       Rule 144 under the Securities Act.

       6,970,156/46.8%                 Upon expiration of applicable one-year holding periods
                                       under Rule 144, which will expire between July 23 and
                                       November 30, 2000, subject to sales volume restrictions
                                       under Rule 144.
</TABLE>

In addition, we intend to file a registration statement on Form S-8 under the
Securities Act approximately 90 days after the date of this offering to register
an aggregate of approximately 3,410,000 shares of common stock issued or
reserved for issuance under our various stock plans.

WE HAVE ISSUED A LARGE NUMBER OF OPTIONS AT EXERCISE PRICES SUBSTANTIALLY BELOW
THE INITIAL PUBLIC OFFERING PRICE, AND THESE OPTIONS COULD BE HIGHLY DILUTIVE TO
INVESTORS IN THIS OFFERING IF THEY ARE EXERCISED OR IF WE BEGIN REPORTING
EARNINGS PER SHARE

    During the nine months ended September 30, 1999, we issued options to
purchase an aggregate of 1,456,000 shares of common stock with a
weighted-average exercise price of $2.45 per share. As of September 30, 1999, we
had outstanding options to purchase an aggregate of 1,722,000 shares of common
stock with a weighted-average exercise price of $2.04 per share. The exercise of
these options could significantly decrease the equity ownership of other
stockholders. Additionally, because we have incurred net losses since inception,
the outstanding shares we have used in determining our net loss per share have
not included any of the shares issuable upon exercise of these options. If and
when we begin reporting earnings per share, the shares issuable upon exercise of
these options will be treated as outstanding for purposes of calculating
earnings per share to the extent required by generally accepted accounting
principles. To the extent such shares are treated as outstanding, they will
dilute our reported earnings per share.

COMPENSATION EXPENSES RELATED TO PAST OPTION GRANTS AND THE NIELSEN MEDIA
RESEARCH WARRANTS WILL REDUCE OUR EARNINGS OVER THE NEXT FOUR YEARS

    Options granted to our employees have historically had exercise prices equal
to the fair market value of our common stock on the date of grant, as determined
by our board of directors at the time of grant. Recently, however, we have
reviewed the terms of our past option grants and determined that the fair value
of our common stock at the time of these grants was greater than the exercise
prices of these options. In addition, in connection with a preferred stock
financing in August 1999, we issued warrants to Nielsen Media Research to
purchase 6,553,054 shares of our common stock. We have recorded a deferred
charge in the quarter ended September 30, 1999 of $22.6 million representing the
value of these warrants. Accordingly, we have recorded non-cash stock-based
compensation charges of $254,000 for the year ended December 31, 1998 and
$26.5 million for the nine months ended September 30, 1999, representing the
difference between the exercise price of these options and the fair value of our
common stock plus the value of the Nielsen Media Research warrants as of the
date of grant. These amounts are amortized as the related options vest and over
the lives of the warrants,

                                       20
<PAGE>
resulting in our recognition of a compensation expense during each amortization
period, which reduces our reported earnings during these periods. We recognized
stock-based compensation expenses of $25,000 in the year ended December 31, 1998
and $2.3 million in the nine months ended September 30, 1999. In light of the
compensation charges that have not yet been amortized, we may recognize
stock-based compensation charges of as much as $1.8 million, $6.1 million,
$5.2 million, $4.8 million, $4.5 million and $3.0 million in the period from
October 1 to December 31, 1999 and the years ended December 31, 2000, 2001,
2002, 2003 and 2004, respectively. The amount of compensation that we ultimately
recognize will be lower to the extent that the options associated with these
expenses are terminated before they vest.

DELAWARE LAW AND OUR CHARTER DOCUMENTS CONTAIN PROVISIONS THAT COULD DISCOURAGE
OR PREVENT A POTENTIAL TAKEOVER OF OUR COMPANY THAT MIGHT OTHERWISE RESULT IN
OUR STOCKHOLDERS RECEIVING A PREMIUM OVER THE MARKET PRICE OF THEIR SHARES

    Provisions of Delaware law and our certificate of incorporation and bylaws
could make more difficult the acquisition of us by means of a tender offer, a
proxy contest, or otherwise, and the removal of incumbent officers and
directors.These provisions include:

    - Section 203 of the Delaware General Corporation Law, which prohibits a
      merger with a 15%-or-greater stockholder, such as a party that has
      completed a successful tender offer, until three years after that party
      became a 15%-or-greater stockholder;

    - the authorization in the certificate of incorporation of undesignated
      preferred stock, which could be issued without stockholder approval in a
      manner designed to prevent or discourage a takeover; and

    - provisions in our bylaws eliminating stockholders' rights to call a
      special meeting of stockholders and requiring advance notice of any
      stockholder nominations of director candidates or any stockholder proposal
      to be presented at an annual meeting, which could make it more difficult
      for stockholders to wage a proxy contest for control of our board or to
      vote to repeal any of the antitakeover provisions contained in our
      certificate of incorporation and bylaws.

INVESTORS IN THIS OFFERING WILL INCUR IMMEDIATE AND SUBSTANTIAL DILUTION

    The initial public offering price is substantially higher than the pro forma
net book value per share of the outstanding common stock. As a result, investors
purchasing common stock in this offering will incur immediate substantial
dilution in the amount of $11.13 per share. In addition, we have issued options
and warrants to acquire common stock at prices significantly below the initial
public offering price. To the extent these outstanding options and warrants are
exercised, there will be further dilution to investors in this offering.

                                       21
<PAGE>
                                USE OF PROCEEDS

    We estimate the net proceeds from this offering to be approximately
$62.2 million, or approximately $71.7 million if the underwriters exercise their
over-allotment option in full, based on the initial public offering price of
$17.00 per share and after deducting the underwriting discount and estimated
offering expenses.

    We currently have no specific plans for the net proceeds from this offering.
We intend to include the net proceeds with our general corporate funds to be
used for general corporate purposes, including working capital and capital
expenditures. We may also use a portion of the net proceeds to acquire or invest
in complementary businesses or products or to obtain the right to use
complementary technologies. However, we have no current commitments or
agreements with respect to any of these types of acquisitions or investments.
Pending these uses, we intend to invest the net proceeds from this offering in
short-term, investment-grade, interest-bearing securities.

                                DIVIDEND POLICY

    We have never paid cash dividends on our capital stock. We currently intend
to retain future earnings, if any, to finance the growth and development of our
business, and we do not anticipate paying any cash dividends in the foreseeable
future. Any future determination to pay cash dividends will be at the discretion
of our board of directors and will depend upon our financial condition,
operating results, capital requirements and other factors the board deems
relevant.

                                       22
<PAGE>
                                 CAPITALIZATION

    The following table sets forth our actual capitalization as of
September 30, 1999. Our capitalization is also presented:

    - on a pro forma basis to give effect to the automatic conversion of all
      outstanding shares of redeemable convertible preferred stock, including
      the shares of our Series A, Series B, Series C and Series D preferred
      stock, into an aggregate of 6,626,476 shares of common stock which will
      occur prior to the closing of this offering; and

    - on a pro forma as adjusted basis to reflect an increase in the authorized
      number of         shares of common stock and preferred stock and the sale
      of 4,000,000 shares of common stock in this offering, resulting in assumed
      net proceeds of $15.56 per share, after deducting the estimated
      underwriting discount and offering expenses, and our receipt and
      application of the net proceeds, the exercise of warrants to purchase
      706,950 shares of Series B preferred stock, resulting in proceeds to us of
      approximately $447,000, and the automatic conversion of those shares of
      preferred stock into 353,471 shares of common stock upon the closing of
      this offering.

<TABLE>
<CAPTION>
                                                                                        PRO FORMA
                                                               ACTUAL     PRO FORMA    AS ADJUSTED
                                                              ---------   ----------   ------------
                                                              (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                           <C>         <C>          <C>
Long-term debt and capital lease obligations, less current
  portion...................................................  $    320     $    320       $    320
                                                              --------     --------       --------
Redeemable convertible preferred stock:
  Authorized shares--15,571,162
  Issued and outstanding shares--14,677,952 actual, none pro
  forma and none pro forma as adjusted......................    35,743           --             --
Stockholders' equity (deficit):
  Preferred stock, $0.001 par value; 1,900,000 shares
    authorized, none issued or outstanding, actual; none
    issued or outstanding, pro forma and pro forma as
    adjusted; 5,000,000 shares authorized, pro forma as
    adjusted................................................        --           --             --
  Common stock, $0.001 par value; 86,851,438 shares
    authorized, 3,892,333 shares issued and outstanding,
    actual; 10,518,809 shares issued and outstanding, pro
    forma; 200,000,000 shares authorized, 14,872,280 shares
    issued and outstanding, pro forma as adjusted...........         4           11             15
  Additional paid-in capital................................    31,144       66,880        129,563
  Deferred compensation.....................................    (3,196)      (3,196)        (3,196)
  Deferred service costs....................................   (22,225)     (22,225)       (22,225)
  Note receivable from stockholder..........................      (125)        (125)          (125)
  Accumulated deficit.......................................   (16,330)     (16,330)       (16,330)
                                                              --------     --------       --------
    Total stockholders' equity (deficit)....................   (10,728)      25,015         87,702
                                                              --------     --------       --------
      Total capitalization..................................  $ 25,335     $ 25,335       $ 88,022
                                                              ========     ========       ========
</TABLE>

    The number of shares of common stock to be outstanding after this offering
is based on the number of shares outstanding as of September 30, 1999 and
excludes:

    - 3,410,000 shares issuable under our 1998 Stock Plan consisting of:

       - 1,722,000 shares issuable upon exercise of options outstanding at
         September 30, 1999, with a weighted average exercise price of $2.04 per
         share;

       - 954,560 shares issuable upon exercise of options granted subsequent to
         September 30, 1999, with a weighted average exercise price of $9.87 per
         share; and

                                       23
<PAGE>
       - 733,440 shares available for future grants;

    - 15,160,600 shares to be issued and sold to Nielsen Media Research
      following expiration or early termination of the applicable waiting period
      under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, consisting
      of:

       - 8,607,546 shares to be sold in a private placement in connection with
         this offering; and

       - 6,553,054 shares issuable pursuant to warrants that Nielsen Media
         Research has agreed to exercise following the completion of this
         offering;

    - 83,468 shares issuable upon exercise of warrants outstanding as of
      September 30, 1999 with a weighted average exercise price of $1.15 per
      share;

    - 43,293 shares issuable upon exercise of a warrant issued subsequent to
      September 30, 1999, with an exercise price of $6.24 per share;

    - 250,000 shares available for issuance under our 1999 Employee Stock
      Purchase Plan.

    See "Management--Stock Plans," "Description of Capital Stock" and Notes 3
and 4 of Notes to Financial Statements.

    In the event Nielsen Media Research completes the foregoing private
placement and warrant exercise, the number of shares issued and outstanding, pro
forma as adjusted, will increase to 30,032,880, additional paid-in capital, pro
forma as adjusted, will increase to $341,058,000 total stockholders' equity, pro
forma as adjusted, will increase to $299,212,000 and total capitalization, pro
forma as adjusted, will increase to $299,532,000.

                                       24
<PAGE>
                                    DILUTION

    The pro forma net tangible book value of our common stock as of
September 30, 1999 was $24.6 million, or $2.34 per share. Pro forma net tangible
book value per share represents the amount of our total assets, excluding net
intangible assets, less our total liabilities, divided by the total number of
shares of common stock outstanding, after giving effect to the conversion of all
outstanding shares of preferred stock into common stock. Dilution in pro forma
net tangible book value per share represents the difference between the amount
per share paid by investors in this offering and the pro forma net tangible book
value per share of our common stock immediately after the offering. After giving
effect to the sale of 4,000,000 shares of common stock in this offering at the
initial public offering price of $17.00 per share and the sale of
353,471 shares of common stock upon exercise of warrants at an exercise price of
$1.27 per share, and after deducting the estimated underwriting discount and
estimated offering expenses payable by us, the pro forma net tangible book value
of our common stock would have been $87.3 million, or $5.87 per share. This
represents an immediate increase in pro forma net tangible book value of $3.53
per share to existing stockholders and an immediate dilution of $11.13 per share
to new investors. The following table illustrates this per share dilution:

<TABLE>
<S>                                                           <C>        <C>
Assumed initial public offering price per share.............             $  17.00
                                                                         --------
  Pro forma net tangible book value per share as of
    September 30, 1999......................................  $   2.34
  Decrease attributable to exercise of warrants.............  $  (0.14)
  Increase in pro forma net tangible book value attributable
    to new public investors.................................  $   3.67
                                                              --------
Pro forma net tangible book value per share after the
  offering..................................................             $   5.87
                                                                         --------
Dilution per share to new public investors..................             $  11.13
                                                                         ========
</TABLE>

    If the underwriters' over-allotment option were exercised in full, the pro
forma net tangible book value per share after the offering would be $6.25 per
share. The increase in pro forma net tangible book value per share to existing
stockholders would be $3.91 per share, and the dilution in pro forma net
tangible book value to new investors would be $10.75 per share.

    Giving effect to the purchase of 15,160,600 additional shares by Nielsen
Media Research at an average price per share of $13.95 following expiration or
early termination of the Hart-Scott-Rodino waiting period, the pro forma net
tangible book value per share as of September 30, 1999 would increase to $9.95,
and new investors in this offering would experience immediate dilution in pro
forma net tangible book value of $7.05 per share.

    The following table summarizes, as of September 30, 1999 the difference
between the total consideration paid and the average price per share paid by the
existing stockholders and the new investors with respect to the number of shares
of common stock purchased from us based upon the initial public offering price
of $17.00 per share:

<TABLE>
<CAPTION>
                                                                           TOTAL
                                            SHARES PURCHASED           CONSIDERATION
                                          ---------------------   -----------------------   AVERAGE PRICE
                                            NUMBER     PERCENT       AMOUNT      PERCENT      PER SHARE
                                          ----------   --------   ------------   --------   -------------
<S>                                       <C>          <C>        <C>            <C>        <C>
Shares purchased in the offering........   4,000,000     26.9%    $ 68,000,000     64.7%       $17.00
Shares purchased upon exercise of
  warrants..............................     353,471      2.4%         447,000      0.4%         1.27
Shares owned by existing stockholders...  10,518,809     70.7%      36,665,000     34.9%         3.49
                                          ----------    -----     ------------    -----
    Total...............................  14,872,280    100.0%    $105,112,000    100.0%         7.07
                                          ==========    =====     ============    =====
</TABLE>

                                       25
<PAGE>
    The information in the above table excludes:

    - 15,160,600 shares to be sold to Nielsen Media Research at an average price
      per share of $13.95 following expiration or early termination of the
      applicable waiting period under the Hart-Scott-Rodino Antitrust
      Improvements Act of 1976, consisting of:

       - 8,607,546 shares to be sold in a private placement in connection with
         this offering; and

       - 6,553,054 shares that are issuable pursuant to warrants that Nielsen
         Media Research has agreed to exercise following the completion of this
         offering;

    - 3,410,000 shares issuable under our 1998 Stock Plan consisting of:

       - 1,722,000 shares issuable upon exercise of options outstanding at
         September 30, 1999, with a weighted average exercise price of $2.04 per
         share;

       - 954,560 shares issuable upon exercise of options granted subsequent to
         September 30, 1999, with a weighted average exercise price of $9.87 per
         share; and

       - 733,440 shares available for future grants;

    - 83,468 shares issuable upon exercise of warrants outstanding at
      September 30, 1999, with a weighted average exercise price of $1.15 per
      share;

    - 43,293 shares issuable upon exercise of a warrant issued subsequent to
      September 30, 1999, with an exercise price of $6.24 per share; and

    - 250,000 shares available for issuance under our 1999 Employee Stock
      Purchase Plan.

                                       26
<PAGE>
                            SELECTED FINANCIAL DATA

    You should read the following selected financial data in conjunction with
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" and our financial statements and the notes thereto included
elsewhere in this prospectus. The statement of operations data set forth below
for the period from July 2, 1997 (inception) to December 31, 1997, the year
ended December 31, 1998 and the nine months ended September 30, 1999 and the
balance sheet data as of December 31, 1997 and 1998 and September 30, 1999 are
derived from, and are qualified by reference to, our audited financial
statements included elsewhere in this prospectus. The statement of operations
data set forth below for the nine month periods ended September 30, 1998 are
derived from, and are qualified by reference to, our unaudited financial
statements included elsewhere in this prospectus. The unaudited financial
statements include all normal recurring adjustments that we consider necessary
for a fair presentation of our financial position and the results of our
operations. The results of operations for the nine months ended September 30,
1999 are not necessarily indicative of the results that may be expected for the
full fiscal year ending December 31, 1999, or any other future period. See the
Notes to Financial Statements for an explanation of the method used to determine
the number of shares used in computing basic and diluted loss per share.

<TABLE>
<CAPTION>
                                                    PERIOD FROM
                                                    JULY 2, 1997                     NINE MONTHS ENDED
                                                   (INCEPTION) TO    YEAR ENDED        SEPTEMBER 30,
                                                    DECEMBER 31,    DECEMBER 31,    -------------------
                                                        1997            1998          1998       1999
                                                   --------------   -------------   --------   --------
                                                          (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                                <C>              <C>             <C>        <C>
STATEMENT OF OPERATIONS DATA:
  Revenue........................................     $    --          $   237      $   132    $  1,486
  Cost of revenue................................          --            1,061          362       4,269
                                                      -------          -------      -------    --------
  Gross profit (loss)............................          --             (824)        (230)     (2,783)
                                                      -------          -------      -------    --------
  Operating expenses:
    Research and development.....................         994            1,185          821       1,806
    Sales and marketing..........................         452            1,134          837       2,559
    General and administrative...................         341              600          413       1,170
    Stock-based compensation.....................          --               25           --       2,327
                                                      -------          -------      -------    --------
      Total operating expenses...................       1,787            2,944        2,071       7,862
                                                      -------          -------      -------    --------
  Loss from operations...........................      (1,787)          (3,768)      (2,301)    (10,645)
  Interest income (expense), net.................           6             (111)         (57)        (25)
                                                      -------          -------      -------    --------
  Net loss.......................................     $(1,781)         $(3,879)     $(2,358)   $(10,670)
                                                      =======          =======      =======    ========
  Basic and diluted net loss per common share....     $ (2.03)         $ (2.78)     $ (1.79)   $  (5.19)
                                                      =======          =======      =======    ========
  Shares used to compute basic and diluted net
    loss per common share........................         878            1,393        1,320       2,056
                                                      =======          =======      =======    ========

  Pro forma basic and diluted net loss per common
    share........................................                      $ (1.67)     $ (1.04)   $  (2.31)
                                                                       =======      =======    ========
  Shares used to compute pro forma basic and
    diluted net loss per common share............                        2,319        2,270       4,626
                                                                       =======      =======    ========
</TABLE>

<TABLE>
<CAPTION>
                                                              AS OF DECEMBER 31,        AS OF
                                                              -------------------   SEPTEMBER 30,
                                                                1997       1998          1999
                                                              --------   --------   --------------
                                                                         (IN THOUSANDS)
<S>                                                           <C>        <C>        <C>
BALANCE SHEET DATA:
  Cash and cash equivalents.................................  $   551    $ 1,343       $ 28,650
  Working capital (deficit).................................       78     (2,791)        24,262
  Total assets..............................................      980      1,965         31,086
  Current amounts due to Nielsen Media Research.............       --      2,539          2,164
  Long-term debt and capital lease obligations, less current
    portion.................................................       --        130            320
  Total stockholders' equity (deficit)......................      472     (2,448)       (10,728)
</TABLE>

                                       27
<PAGE>
                      MANAGEMENT'S DISCUSSION AND ANALYSIS
                OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

    THE FOLLOWING DISCUSSION CONTAINS FORWARD-LOOKING STATEMENTS THAT INVOLVE
RISKS AND UNCERTAINTIES. OUR ACTUAL RESULTS COULD DIFFER SUBSTANTIALLY FROM
THOSE ANTICIPATED IN THESE FORWARD-LOOKING STATEMENTS AS A RESULT OF MANY
FACTORS, INCLUDING THOSE SET FORTH UNDER "RISK FACTORS" AND ELSEWHERE IN THIS
PROSPECTUS. THE FOLLOWING DISCUSSION SHOULD BE READ TOGETHER WITH OUR FINANCIAL
STATEMENTS AND RELATED NOTES THERETO INCLUDED ELSEWHERE IN THIS PROSPECTUS.

OVERVIEW

    We provide Internet audience measurement information and analysis. We were
incorporated in July 1997. From our founding through the launch of our initial
NetRatings service offering in March 1998, we were primarily engaged in research
activities, developing our initial products and services, raising capital and
building our business infrastructure. Our initial service offering utilized a
Web-based panel selection methodology, a relatively small audience panel and an
early version of our data collection software. In October 1998, we established
our strategic relationship with Nielsen Media Research. Through this
relationship, we began developing an expanded Internet audience panel based on
the Nielsen Media Research audience sampling methodology and enhanced versions
of our software. In March 1999, we launched our Nielsen//NetRatings brand of
product and service offerings.

    In June 1999, we commenced our international expansion efforts by
establishing a joint venture, NetRatings KK, in which we currently hold a 32%
ownership interest with several Japanese investors holding the remaining
interests. NetRatings KK is responsible for building and maintaining a Japanese
audience measurement panel and introducing our products and services to the
Japanese market. In September 1999, we entered into a joint venture with
ACNielsen to develop and maintain Internet audience measurement panels and to
market products and services under the Nielsen//NetRatings brand in other key
international markets. Through the joint venture, in which we currently hold a
19.9% ownership interest, we plan to develop Internet audience measurement
panels based in Australia, Ireland, New Zealand and the United Kingdom in the
first half of 2000 and in Austria, Denmark, Finland, France, Germany, Norway and
Sweden by the end of 2000.

    We generate revenue from the sale of our Internet audience measurement
products and services. Through September 30, 1999, our information and
analytical products and services, which include our audience measurement
service, e-commerce service and Internet investment strategy service, have
accounted for substantially all of our revenue. We primarily sell these products
and services pursuant to one-year subscription agreements and bill our customers
in advance, typically on a quarterly or annual basis. We recognize revenue from
the sale of our information and analytical products and services ratably over
the term of the subscription agreement. Prepaid subscription fees are recorded
as deferred revenue until earned. We also derive revenue from the sale of custom
research services. Revenue from these services are recognized in the period in
which the service is provided. We sell our products and services to customers in
a wide range of industries. Our customer base has increased from 53 customers as
of December 31, 1998 to 163 as of September 30, 1999. To date, substantially all
of our sales have been made to customers in North America. In future periods, we
also expect to derive royalties and other revenue from our joint ventures as
they begin their operations in international markets.

    Cost of revenue currently consists primarily of expenses related to the
recruitment and maintenance of our audience measurement panels. Accordingly,
cost of revenue is not directly related to revenue or subscriptions generated in
a given period and is higher in periods in which we are involved in significant
panel development activities. We believe that the continued development and
enhancement of audience panels is essential to the long-term expansion of our
business. We are currently working with Nielsen Media Research to expand the
scope and size of our existing panel of at-home Internet users. In addition, we
are developing a panel of at-work users. We expect that costs of revenue will
increase in future periods as we continue to develop and enhance our audience
measurement panels.

                                       28
<PAGE>
    Research and development expenses consist primarily of compensation and
related costs for personnel associated with our product development activities.
These costs are expensed as incurred. We believe that continued investment in
product development is essential to our future success. We also anticipate that
additional development resources will be required to support the planned
international activities of our joint ventures. Accordingly, we expect that
research and development expenses will increase in future periods as we hire
additional personnel.

    Sales and marketing expenses consist primarily of salaries, benefits and
commissions to our salespeople and commissions paid to Nielsen Media Research,
as well as costs related to seminars, promotional materials and other sales and
marketing programs. We intend to expand our sales force in conjunction with our
domestic expansion and to support our international joint ventures. We also
intend to increase our marketing activities to enhance brand awareness of our
products and services. We therefore expect that sales expenses will increase in
future periods.

    General and administrative expenses consist primarily of salaries and
related costs for finance, accounting, and other administrative personnel, in
addition to professional fees, provisions for doubtful accounts and other
general corporate expenses. We expect that general and administrative expenses
will increase in the future as we add personnel to support expanding operations,
incur additional costs related to the growth of our business and assume the
reporting requirements of a public company.

    In connection with the grant of certain stock options to employees and
consultants, we recorded non-cash stock-based compensation charges of $254,000
for the year ended December 31, 1998 and $3.9 million for the nine months ended
September 30, 1999, representing the difference between the exercise price of
these options and the fair value of our common stock as of the date of grant.
These amounts are being amortized over the respective vesting periods of the
options using a graded vesting method. Simultaneously with the Series C
offering, we entered into additional agreements with Nielsen Media Research
governing the Company's strategic relationship with Nielsen Media Research. We
also issued warrants to Nielsen Media Research and we recorded non-cash
stock-based compensation charges of $22.6 million for the nine months ended
September 30, 1999 representing the value of these warrants based on the
Black-Scholes valuation model. The value of these warrants is being amortized
over five years and is subject to change based upon the initial public offering
price of our common stock. We recognized non-cash amortization of these deferred
stock compensation charges of $25,000 in the year ended December 31, 1998 and
$2.3 million in the nine months ended September 30, 1999. As of September 30,
1999, the remaining deferred compensation was scheduled to be amortized at the
rate of approximately $1.8 million, $6.1 million, $5.2 million, $4.8 million,
$4.5 million and $3.0 million in the period from October 1 to December 31, 1999
and the years ended December 31, 2000, 2001, 2002, 2003 and 2004, respectively.
The actual amount of stock-based compensation expense to be recognized in future
periods could decrease if options for which accrued compensation has been
recorded are terminated before they vest.

    We have recorded no provision for federal or state income taxes for any
period since our inception as we have incurred losses in each period. As of
September 30, 1999, we had approximately $11.9 million of net operating loss
carryforwards for federal and state income tax purposes, available to reduce
future taxable income, expiring in 2005. Utilization of the net operating loss
and tax credit carryforwards may be subject to a substantial annual limitation
due to the ownership change limitations provided by the Internal Revenue Code of
1986, as amended, and similar state provisions. The annual limitation may result
in the expiration of the net operating loss and tax credit carryforwards before
utilization. See Note 11 of Notes to Financial Statements.

    We have a limited operating history upon which investors may evaluate our
business and prospects. We incurred net losses of $1.8 million for the period
from July 2, 1997 (inception) through December 31, 1997; $3.9 million for the
year ended December 31, 1998; and $10.7 million for the nine months ended
September 30, 1999. Our accumulated deficit at September 30, 1999 was
$16.3 million. We intend to invest heavily to expand our audience panels,
strengthen our direct sales force and enhance our product and service offerings.
As a result, we expect to continue to incur net losses for the

                                       29
<PAGE>
foreseeable future. In view of the rapidly evolving nature of our business and
our limited operating history, we believe that period-to-period comparisons of
our operating results are not necessarily meaningful and should not be relied
upon as an indication of our future performance. See "Risk Factors--We have
incurred losses since inception, and we may be unable to achieve profitability."

RESULTS OF OPERATIONS

  NINE MONTHS ENDED SEPTEMBER 30, 1998 COMPARED TO NINE MONTHS ENDED
SEPTEMBER 30, 1999

    REVENUE.  Revenue increased from $132,000 for the nine months ended
September 30, 1998 to $1.5 million for the nine months ended September 30, 1999.
Sales of our information and analytical products and services accounted for
substantially all of the revenue for each of the nine-month periods. The
increase in revenue was primarily due to the introduction of our
Nielsen//NetRatings service in March 1999 and the introduction of additional
product and service offerings that resulted in a substantial increase in the
number of our customers.

    COST OF REVENUE.  Cost of revenue increased from $362,000 for the nine
months ended September 30, 1998 to $4.3 million for the nine months ended
September 30, 1999. This increase primarily reflected costs incurred in 1999
relating to the development of the Nielsen//NetRatings audience measurement
panel, which is significantly larger than our prior panel and was more costly to
develop due to the sampling methodology employed.

    RESEARCH AND DEVELOPMENT.  Research and development expenses increased 120%
from $821,000 for the nine months ended September 30, 1998 to $1.8 million for
the nine months ended September 30, 1999. This increase was primarily due to a
three-fold increase in the number of employees engaged in research and
development.

    SALES AND MARKETING.  Sales and marketing expenses increased 205% from
$837,000 for the nine months ended September 30, 1998 to $2.6 million for the
nine months ended September 30, 1999. This increase was primarily attributable
to a three-fold increase in the number of direct sales and marketing employees.

    GENERAL AND ADMINISTRATIVE.  General and administrative expenses increased
185% from $413,000 for the nine months ended September 30, 1998 to $1.2 million
for the nine months ended September 30, 1999. This increase was primarily
related to an increase in the number of administrative personnel to support our
expanded operations and non-recurring legal fees.

    INTEREST INCOME (EXPENSE), NET.  Interest expense, net, decreased 58% from
$57,000 for the nine months ended September 30, 1998 to $25,000 for the nine
months ended September 30, 1999 due to interest paid to Nielsen Media Research
under short-term promissory notes, interest paid under promissory notes issued
in 1998 and increased borrowings under our credit facilities offset by increases
in interest income resulting from increases in cash balances.

    NET LOSS.  Net loss increased 352% from $2.4 million for the nine months
ended September 30, 1998 to $10.7 million for the nine months ended
September 30, 1999. This increase was primarily due to costs associated with the
development of the Nielsen//NetRatings audience measurement panel, a three-fold
increase in headcount to support our expanded operations, and an increase in
stock based compensation expenses.

  PERIOD FROM JULY 2, 1997 (INCEPTION) TO DECEMBER 31, 1997 COMPARED TO YEAR
ENDED DECEMBER 31, 1998

    REVENUE.  We had no revenue in the period from July 2, 1997 (inception) to
December 31, 1997, or the "inception period." In the year ended December 31,
1998 we had revenue of $237,000 from sales of our initial NetRatings Internet
audience measurement products and services.

    COST OF REVENUE.  We had no cost of revenue in the inception period. In the
year ended December 31, 1998, our cost of revenue was $1.1 million, representing
panel development expenses related to the introduction of our initial NetRatings
Internet audience measurement products and

                                       30
<PAGE>
services and, beginning in November 1998, initial panel development expenses
related to our Nielsen//NetRatings product and service offerings.

    RESEARCH AND DEVELOPMENT.  Research and development expenses increased 19%
from $994,000 in the inception period to $1.2 million in the year ended December
31, 1998. This increase was primarily due to a full year of operations in 1998.

    SALES AND MARKETING.  Sales and marketing expenses increased 151% from
$452,000 in the inception period to $1.1 million in the year ended December 31,
1998. This increase was primarily attributable to increased marketing and
promotion of our initial NetRatings Internet audience measurement service as
well as an increase in the number of direct sales and marketing employees. In
addition, sales and marketing expenses during 1998 reflected a full year of
operations.

    GENERAL AND ADMINISTRATIVE.  General and administrative expenses increased
76% from $341,000 in the inception period year to $600,000 in the year ended
December 31, 1998. This increase was due to an increase in the number of
administrative personnel to support our expanded operations. In addition,
general and administrative expenses during 1998 reflected a full year of
operations.

    INTEREST INCOME (EXPENSE), NET.  Interest income, net, was $6,000 in the
inception period. Interest expense, net, of $111,000 in the year ended
December 31, 1998 was primarily the result of interest paid on promissory notes
issued in 1998, which were converted to preferred stock in July 1999 and
amortization of the fair value of the warrants issued in conjunction with those
promissory notes.

    NET LOSS.  Net loss increased 118% from $1.8 million in the inception period
to $3.9 million for the year ended December 31, 1998. This increase was
primarily due to costs associated with panel development initiated in 1998 as
well as one full year of operations.

QUARTERLY RESULTS OF OPERATIONS

    The following table sets forth certain unaudited statement of operations
data for the seven quarters ended September 30, 1999. This information has been
derived from our unaudited interim financial statements. In management's
opinion, this unaudited information has been prepared on the same basis as our
annual financial statements and includes all adjustments, consisting only of
normal recurring adjustments, necessary for a fair presentation of the
information for the quarters presented. This information should be read in
conjunction with the financial statements and notes thereto included elsewhere
in this prospectus. Historical results for any quarter are not necessarily
indicative of the results to be expected for any future period.

<TABLE>
<CAPTION>
                                                                   QUARTER ENDED
                                -----------------------------------------------------------------------------------
                                MARCH 31,    JUNE 30,    SEPT. 30,   DEC. 31,    MARCH 31,    JUNE 30,    SEPT. 30,
                                   1998        1998        1998        1998         1999        1999        1999
                                ----------   ---------   ---------   ---------   ----------   ---------   ---------
                                                                  (IN THOUSANDS)
<S>                             <C>          <C>         <C>         <C>         <C>          <C>         <C>
Revenue.......................     $   3       $  51       $  77      $   106      $   166     $   476     $   844
Cost of revenue...............       103          97         161          700        1,031       1,125       2,113
                                   -----       -----       -----      -------      -------     -------     -------
Gross profit (loss)...........      (100)        (46)        (84)        (594)        (865)       (649)     (1,269)
                                   -----       -----       -----      -------      -------     -------     -------
Operating expenses:
  Research and development....       323         250         247          365          428         695         683
  Sales and marketing.........       283         282         273          296          490         883       1,186
  General and
    administrative............       154         137         120          189          256         253         661
  Stock-based compensation....        --          --          --           25           71       1,068       1,188
                                   -----       -----       -----      -------      -------     -------     -------
    Total operating
      expenses................       760         669         640          875        1,245       2,899       3,718
                                   -----       -----       -----      -------      -------     -------     -------
Loss from operations..........      (860)       (715)       (724)      (1,469)      (2,110)     (3,548)     (4,987)
Interest income (expense),
  net.........................        --         (25)        (35)         (51)         (67)        (55)         97
                                   -----       -----       -----      -------      -------     -------     -------
Net loss......................     $(860)      $(740)      $(759)     $(1,520)     $(2,177)    $(3,603)    $(4,890)
                                   =====       =====       =====      =======      =======     =======     =======
</TABLE>

                                       31
<PAGE>
    We introduced our first products and services in March 1998, and our revenue
increased through the balance of 1998 as we expanded our customer base and
introduced additional products and services. The substantial increases in
revenue in the quarters ended June 30, 1999 and September 30, 1999 were the
result of increased sales to new and existing customers following the
introduction of our Nielsen//NetRatings products and services in March 1999.

    Cost of revenue increased substantially in the quarters ended December 31,
1998, March 31, 1999 and September 30, 1999 primarily reflecting audience panel
recruitment expenses incurred in connection with the recruitment of our
household panel beginning in November of 1998 as well as the initial recruitment
activities of our business panel in September 1999. Quarterly increases in
operating expenses over the past four quarters reflected the continued expansion
of our operations.

    Our operating results have fluctuated in the past, and we expect them to
fluctuate in future quarters as a result of a variety of factors, many of which
are outside of our control. See "Risk Factors--Fluctuations in our quarterly
revenues and operating results might lead to reduced prices for our stock."

LIQUIDITY AND CAPITAL RESOURCES

    Since our inception, we have funded our operations primarily through private
sales of equity securities. In May and November 1998, we raised a total of
$935,000, net of offering costs, from the issuance of promissory notes that were
converted into redeemable preferred stock in July 1999. Between November 1998
and April 1999, we received $3.0 million from the issuance of promissory notes
to Nielsen Media Research. These notes were converted into redeemable preferred
stock in August 1999 in connection with a preferred stock financing in which we
raised $19.4 million, net of offering costs. In September 1999, we completed an
additional redeemable preferred stock financing of $15.2 million, net of
estimated offering costs.

    We have a total $1.2 million equipment line of credit with Venture
Lending & Leasing and Venture Lending & Leasing II. Borrowings under the line of
credit are secured by all of our tangible assets and bear interest at an annual
rate of 8%. In addition, we have a $1 million commercial line of credit with
Heritage Bank of Commerce. Borrowings under this line are secured by our
business assets other than those securing our equipment loans and bear interest
at the bank's prime interest rate, which was 8.25% as of September 30, 1999. We
also have a $350,000 line of credit with Heritage Bank of Commerce to fund
equipment purchases. Any advances under this equipment line mature 36 months
following funding and bear interest at the bank's prime rate. Our credit
agreement with Heritage Bank contains certain financial covenants, including
minimum liquidity at or above $5 million, tangible net worth of $10 million, and
debt to tangible net worth ratio of 1-to-1. As of September 30, 1999, we were in
compliance with all of these covenants.

    As of September 30, 1999 we had utilized approximately $500,000 under the
equipment line of credit with Venture Lending & Leasing and Venture Lending &
Leasing II.

    As of September 30, 1999, our principal source of liquidity was
$28.7 million in cash and cash equivalents and $2.1 million available remaining
under our lines of credit.

    Net cash used in operating activities was $1.3 million in 1997,
$2.9 million in 1998 and $5.5 million in the nine months ended September 30,
1999. Net cash used in operating activities in 1997 reflected a net loss of
$1.8 million offset principally by increases in accounts payable and accrued
liabilities totaling $508,000. Net cash used in operating activities in 1998
reflected a net loss of $3.9 million and an increase of $158,000 in accounts
receivable offset by depreciation and amortization of $200,000, an increase in
accrued expenses of $334,000 and an increase in deferred revenue of $280,000.
Net cash used in operating activities in the nine months ended September 30,
1999 reflected a net loss of $10.7 million and an increase of $1.2 million in
accounts receivable offset by non-cash stock-based

                                       32
<PAGE>
compensation charges totaling $2.3 million, an increase of $1.7 million in
deferred revenue and an increase of $763,000 in accrued expenses.

    Since our inception, our investing activities have consisted primarily of
purchases of fixed assets, principally computer hardware and software for our
growing number of employees. Capital expenditures totaled $391,000 in 1997,
$173,000 in 1998 and $328,000 in the nine months ended September 30, 1999.
Although we had no material capital expenditure commitments as of September 30,
1999, we expect that capital expenditures will increase with our anticipated
growth in operations, infrastructure and personnel both domestically and
internationally. We do not expect to incur significant costs to make our
software or internal information systems year 2000 compliant because we believe
this software and these information systems are designed to function properly
through and beyond year 2000.

    Net cash provided by financing activities totaled $2.3 million in 1997,
$3.9 million in 1998 and $33.1 million in the nine months ended September 30,
1999. Net cash provided by financing activities primarily consisted of the
proceeds of issuances of preferred stock and promissory notes in each of these
periods and, in 1998 and the nine months ended September 30, 1998, included
proceeds from the equipment line of credit.

    We believe that our existing balances of cash and cash equivalents and our
available credit facilities will be sufficient to meet our cash needs for
working capital and capital expenditures for at least the next 12 months,
although we could elect to seek additional funding prior to that time. We could
require additional capital prior to the end of this period if, for example, we
were to experience greater than expected losses from operations or if we were to
pursue one or more business acquisitions or investments. At present we do not
have any commitments or agreements for business acquisitions or investments. If
we do require additional financing, however, we cannot be certain that it will
be available when required, on favorable terms or at all. If we are not
successful in raising additional capital as required, our business could be
harmed. If additional funds are raised through the issuance of equity
securities, the percentage ownership of our then-current stockholders would be
reduced.

    Although we currently have no material commitments for capital expenditures,
we expect to experience an increase in our capital expenditures and lease
commitments consistent with our anticipated growth in operations, infrastructure
and personnel. We currently anticipate that we will continue to experience
growth in our operating expenses beyond the next 12 months and that operating
expenses will be a material use of our cash resources. In the event Nielsen
Media Research is unable to consummate its planned purchase of additional shares
of our common stock, it is highly likely that we will be required to raise
additional capital in the future.

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." SFAS No. 133 requires all derivative instruments to be
recorded on the balance sheet at their fair value. Changes in the fair value of
derivatives are recorded each period in current earnings or other comprehensive
income, depending on whether a derivative is designed as part of a hedge
transaction and, if so, the type of hedge transaction. In June 1999, the FASB
issued SFAS No. 137, "Accounting for Derivative Instruments and Hedging
Activities--Deferral of the Effective Date of FASB Statement No. 133," which
amends SFAS No. 133 to be effective for all fiscal quarters or all fiscal years
beginning after June 15, 2000, or January 1, 2001 for us. We do not expect that
the adoption of this statement will have a material impact on our reported
results of operations.

                                       33
<PAGE>
MARKET RISK

    The following discussion analyzes our exposure to market risk related to
changes in interest rates and foreign currency exchange rates.

  FOREIGN CURRENCY EXCHANGE RATE RISK

    To date, substantially all of our recognized revenue has been denominated in
U.S. dollars and generated primarily from customers in the United States, and
our exposure to foreign currency exchange rates has been immaterial. We expect,
however, that future product and service revenue may also be derived from
international markets and may be denominated in the currency of the applicable
market. As a result, our operating results may become subject to significant
fluctuations based upon changes in exchange rates of certain currencies in
relation to the U.S. dollar. Furthermore, to the extent that we engage in
international sales denominated in U.S. dollars, an increase in the value of the
U.S. dollar relative to foreign currencies could make our products and services
less competitive in international markets. Although we will continue to monitor
our exposure to currency fluctuations, and, when appropriate, may use financial
hedging techniques in the future to minimize the effect of these fluctuations,
we cannot assure you that exchange rate fluctuations will not adversely affect
our financial results in the future.

  INTEREST RATE RISK

    As of September 30, 1999, we had cash and cash equivalents of $28.7 million
consisting of cash and highly liquid, short-term investments. Our short-term
investments will decline by an immaterial amount if market interest rates
increase, and therefore, our exposure to interest rate changes has been
immaterial. Declines of interest rates over time will, however, reduce our
interest income from our short-term investments. Our outstanding notes payable
and capital lease obligations are all at fixed interest rates and therefore have
minimal exposure to interest rates.

YEAR 2000 COMPLIANCE

    We are aware of the issues surrounding the year 2000 and problems relating
to computers and computer software incorrectly distinguishing between 21st and
20th century dates. Year 2000 issues could affect our products and services as
well as our internal management control systems.

    We are currently conducting a year 2000 readiness review of our proprietary
software which is utilized to collect panel data and generate our Internet
audience measurement information products and services. This review includes:

    - assessment and quality assurance testing of our proprietary software;

    - implementation, including remediation, upgrading and replacement of
      non-compliant product versions;

    - validation testing; and

    - contingency planning.

    We have completed all phases of our review, except for validation testing
and contingency planning, as it relates to the current version of our software.

    We have designed all of our proprietary software to be year 2000 compliant.
We define "year 2000 compliant" as the ability to:

    - correctly handle date information needed for the December 31, 1999 to
      January 1, 2000 date change;

                                       34
<PAGE>
    - function according to the product documentation provided for this date
      change, without changes in operation resulting from the advent of a new
      century, assuming correct configuration;

    - where appropriate, respond to two-digit date input in a way that resolves
      the ambiguity as to a century in a disclosed, defined, and predetermined
      manner;

    - store and provide output of date information in ways that are unambiguous
      as to century if the date elements in interfaces and data storage specify
      the century; and

    - recognize the year 2000 as a leap year.

    We have tested our data collection software and our internal programs and,
based on these tests, we believe that our software is year 2000 compliant. We
are currently testing licensed software and freeware, obtained from third
parties that is incorporated into our software, and have received written
assurances from our primary vendor, Oracle, that this licensed software is year
2000 compliant. We therefore do not expect to expend significant resources to
resolve year 2000 errors in our software. However, we can not be certain that
our test procedures will uncover all possible year 2000 errors in our software.
If our tests and design measures have failed to discover and resolve all year
2000 problems in our data collection software and we fail to provide or
inaccurately provide services under the terms of a subscription agreement, our
reputation could be harmed.

    Our internal systems include both our computer and network systems and other
systems. We have initiated an assessment of our most important computer and
network systems. To the extent we are not able to assess the technology provided
by third-party vendors, we are seeking assurances from them that their systems
are year 2000 compliant. We have received written assurances from our primary
vendor, AboveNet, that its systems are year 2000 compliant. Although we are not
currently aware of any material operational issues or costs associated with
preparing these systems for the year 2000, we may experience unanticipated
problems and costs caused by undetected errors or defects in the technology used
in these systems.

    We have funded our year 2000 compliance plan from available cash and have
not separately accounted for these costs. To date, these costs have not been
material. We expect to incur additional costs related to the year 2000
compliance plan for:

    - administrative personnel to manage the project;

    - outside contractor assistance; and

    - product engineering and customer satisfaction.

    We expect to complete our assessment and resolution of all year 2000
problems that we are capable of addressing before December 31, 1999. However, we
believe that it is not possible to determine with complete certainty that all
year 2000 problems affecting us have been identified and corrected. Furthermore,
some year 2000 problems are beyond our control.

    We believe that our most likely worst-case scenario related to the year 2000
problem is a failure of a significant number of our panelists' computer systems
to operate correctly. Were this to occur, our ability to collect data could be
adversely affected and our sample size reduced resulting in inaccuracies in our
reports and damage to our reputation.

    We have not developed a contingency plan to address situations that may
result if we are unable to achieve year 2000 readiness of our critical
operations and do not anticipate the need to do so. The cost of developing and
implementing a plan may itself be material. We are also subject to external
forces that might generally affect industry and commerce, such as year 2000
problems affecting utilities, Internet service providers or banks. A prolonged
Internet, telecommunications or electrical failure, could prevent us from
receiving data from our panel, processing the data and providing reports to our
clients and could have a material adverse effect on our business, results of
operations and financial condition.

                                       35
<PAGE>
                                    BUSINESS

    We provide Internet audience measurement information and analysis. Our
products and services enable our customers to make informed business-critical
decisions regarding their Internet strategies. We deliver accurate and timely
Internet audience information, collected from a representative sample of
Internet users, and augment this information with detailed, flexible reporting
and in-depth analysis. Our customers include leading e-commerce companies,
advertising agencies, media companies, Internet companies and financial
institutions. We have formed strategic relationships with Nielsen Media
Research, the leading source of television audience measurement and related
services in the United States and Canada, and ACNielsen, a leading provider of
market research information and analysis to the consumer products and services
industries. We believe that these relationships allow us to offer the most
accurate Internet audience information currently available. Our proprietary
activity tracking and data collection technology gathers comprehensive and
detailed information regarding Internet user behavior, including both site and
advertising activity. We began providing Internet audience measurement products
and services under the brand name Nielsen//NetRatings in March 1999. We believe
that our Internet sampling methodologies, our real-time data collection
technology, our powerful, flexible reporting systems, and our strategic
relationships position us for leadership in the market for global Internet
audience measurement and analysis.

INDUSTRY BACKGROUND

  GROWTH IN GLOBAL INTERNET USAGE, E-COMMERCE AND ONLINE ADVERTISING

    The Internet has emerged as a significant global medium for communications,
information and commerce. It is growing dramatically, based on key measures,
including total number of users, total number of Web sites, e-commerce
transaction volume and online advertising dollars.

    Both content and e-commerce on the Internet are growing dramatically.
According to International Data Corporation, or IDC, the number of individual
Web site addresses, commonly referred to as "URLs," on the Internet has grown
from approximately 18 million at the end of 1995 to approximately 925 million at
the end of 1998, and is expected to grow to approximately 13 billion in 2003.
Also, according to IDC, the number of users buying goods and services on the
Internet has grown from approximately 3 million in 1995 to approximately
31 million in 1998, and is expected to grow to approximately 183 million in
2003. IDC estimates that the total annual value of goods and services purchased
over the Internet has grown from approximately $296 million in 1995 to
approximately $50 billion in 1998, and is expected to grow to over $1.3 trillion
by 2003.

    As the Internet attracts larger numbers of users, spending for Internet
advertising is expected to increase. According to Forrester Research, global
annual online advertising expenditures are projected to increase from
approximately $1.5 billion in 1998 to approximately $24 billion in 2003.

    In addition to the increasing number of Internet users, there has also been
a significant increase in the number of devices that can access the Internet.
While such devices originally consisted only of personal computers, there has
been a recent emergence of a number of alternative devices to access the
Internet, including television set-top boxes, handheld computing devices,
Web-enabled phones and Internet gaming devices. According to IDC, the number of
devices worldwide that are capable of accessing the Internet has grown from
approximately 14 million at the end of 1995 to approximately 150 million at the
end of 1998 and is expected to grow to approximately 722 million by the end of
2003.

  UNIQUE CHARACTERISTICS OF ONLINE COMMERCE AND ADVERTISING

    The Internet also presents advertisers and online businesses with a unique
opportunity to target prospective consumers and to measure the return on their
advertising or marketing investment. Using

                                       36
<PAGE>
traditional media, such as television, an advertiser must broadcast its
advertisements to an entire audience for a given program in a given market, even
though the advertiser may have desired to target only a portion of the overall
audience. With the Internet, on the other hand, users visiting the same Web
page at the same moment can be presented with different advertisements based on
their Internet usage behavior. In addition, while an advertiser using
traditional media cannot directly measure how an individual audience member
reacts to an advertisement, the Internet makes it possible for an advertiser or
e-commerce company to track how its audience interacts with an advertisement or
an e-commerce site.

  THE EXPECTED CONVERGENCE OF TELEVISION AND THE INTERNET

    We believe that the convergence of television programming with Internet
content and interactivity represents a significant emerging trend. Today,
considerable advertising is being conducted in traditional media, such as
television, in order to drive traffic and commercial activity to Internet sites.
For example, a Victoria's Secret advertisement aired during the 1999 Super Bowl
was designed to draw people to an online fashion show conducted on the
Victoria's Secret Web site. We believe that this trend toward the convergence of
television and the Internet will continue. For example, we believe that, in the
future, television content and advertising will include Internet links on which
viewers can click to make a direct response, such as making an online purchase.
As this convergence takes place, the ability to track television audiences as
they use the Internet will become an increasingly critical requirement for all
major advertisers and their agencies as they seek to capitalize on these
cross-media opportunities.

  THE NEED FOR INTERNET AUDIENCE MEASUREMENT AND ANALYSIS

    As the Internet continues to evolve and online advertising and electronic
commerce continue their dramatic growth, companies conducting business online
are continually challenged to define and reach their target audiences as well as
develop sophisticated online business strategies. The unique dynamics of the
Internet require that online market participants understand their markets and
quickly recognize and adapt to changing conditions in their particular
industries. In order to remain competitive, these online companies demand
detailed audience measurement information and analysis that will enable them to
make informed business decisions in a timely manner. These companies are seeking
a trusted third party source for information that can provide them with the
following:

    - ACCURATE AND TIMELY INFORMATION. To be useful, information derived from
      audience samples must accurately reflect the size and behavior of the
      overall Internet audience. Accordingly, such information must be gathered
      from a large, representative sample using statistical methods that
      eliminate as much bias as possible. The information must also be timely;
      the faster the information can be analyzed and reported, the more
      efficiently an online business can adapt to its target audience's changing
      characteristics and preferences.

    - DETAILED, FLEXIBLE REPORTING AND ANALYSIS. The usefulness of Internet
      audience information can be significantly enhanced by detailed analysis
      presented in a flexible format that allows customers to manipulate the
      information to meet their unique requirements. Presenting information and
      analysis in this way could enable a customer to:

       - track the demographic profiles and behavior of users that visit a
         particular site or click on a particular banner advertisement, in order
         to target advertising at users matching particular demographic
         profiles;

       - correlate user behavior on a site with the user's behavior on the
         Internet before entering and after leaving the site, tracking other
         sites visited and how the user behaved on those sites;

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<PAGE>
       - track users' interactions with Web sites, such as the duration and
         frequency of visits to a site and the proportion of visitors to a site
         that make purchases during their visits, referred to as the
         "look-to-book" ratio;

       - track users' interactions with advertisements, such as the proportion
         of clicks on a banner advertisement compared to the number of times the
         advertisement appears, referred to as the "click-through rate," and the
         proportion of users that make a purchase after clicking on a particular
         advertisement, referred to as the "click-to-conversion" ratio;

       - evaluate banner advertisements to compare the effectiveness of
         different advertisements or to track a competitor's advertisement
         placements; and

       - identify significant trends relating to online companies and Internet
         usage.

    - CROSS-MEDIA AND CROSS-PLATFORM MEASUREMENT CAPABILITIES. To obtain a
      comprehensive measurement of Internet audience usage, companies conducting
      business online will require an Internet audience measurement solution
      that is capable of capturing data from both television and Internet users
      and across a wide range of Internet access devices. This requires
      specialized technologies and expertise to adapt audience measurement
      techniques to disparate emerging platforms. The data collection method
      must not only be capable of operating on different types of devices, but
      must also be capable of collecting and transmitting comparable streams of
      data regardless of the device.

    - A UNIFORM STANDARD OF MEASUREMENT. Internet audience measurement
      statistics are of limited use, unless Internet site and advertisement
      activity can be measured according to a common "yardstick." As has been
      the case with Nielsen Media Research in the market for television audience
      measurement and with Arbitron in the market for radio audience
      measurement, we believe that the company that provides the highest quality
      audience measurement information and analysis will eventually emerge as
      the industry standard.

    We believe that no standard has yet emerged because most companies offering
Internet measurement services have been unable to provide a comprehensive
solution that includes accurate and timely information, as well as detailed and
flexible reporting and analysis. Accordingly, a significant market opportunity
exists for a company that can provide customers with products and services that
meet these needs.

THE NETRATINGS SOLUTION

    We deliver meaningful and timely information that enables our customers to
make informed business-critical decisions regarding their Internet strategies.
Our products, services and technology provide accurate Internet audience
information combined with detailed and flexible reporting and in-depth analysis.
We believe that our solution will enable us to become the standard for measuring
the size, profile and behavior of Internet audiences. Our solution, marketed
under the Nielsen//NetRatings brand, includes the following key components:

    ESTABLISHED SAMPLING METHODOLOGIES.  Our solution is designed to provide
reliable, independent information that customers need to make critical business
decisions. We believe that our strategic relationship with Nielsen Media
Research allows us to offer the most accurate Internet audience sampling
methodology currently available. Nielsen Media Research has set the standard for
television audience measurement over the past 50 years, utilizing an established
sampling methodology that is widely used throughout the major segments of the
audience measurement and media research industry. Nielsen Media Research
develops our panel using the same sampling methodology that it uses in
developing television audience panels. In addition, through our joint venture
with ACNielsen, we intend to offer solutions in international markets utilizing
ACNielsen's established audience sampling methodologies based upon its 76 years
of experience in consumer market research.

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<PAGE>
    PROPRIETARY MEASUREMENT TECHNOLOGY.  Our proprietary activity tracking and
data collection technology gathers comprehensive and detailed information
regarding Internet user behavior, including sites and pages visited, time spent
on each site, advertising exposure and effectiveness, e-commerce transactions
executed, and streaming media usage. The software also collects key information
regarding activity on America Online's proprietary service. All of our data is
collected from the entire panel and transmitted to our central database in
real-time. The information is linked to demographic profiles of Internet users
to provide comprehensive products and services for measuring Internet usage
behavior. Once installed, our software requires virtually no panelist
intervention and software updates are automatic.

    POWERFUL, FLEXIBLE REPORTING SYSTEMS.  Our solution provides customers with
a variety of daily, weekly and monthly reports that can be modified by our
customers, enabling them to easily manipulate data to meet their specific
information requirements. Our easy-to-use interface provides immediate access to
various levels of detailed information and enables custom queries on selected
information. Our service provides customers with two levels of information
access, which are available in weekly and monthly reports based on data that has
been uploaded to our database from our panel members' computers in real time.
Our Quick Looks feature provides customers with comprehensive pre-defined
Internet user behavior and demographic information. We also provide Select
Views, which are powerful, easy-to-use, menu-driven queries that respond to
specific information requests.

    TIMELY, INSIGHTFUL ANALYSIS.  Our solution delivers insightful analysis
based upon detailed Internet audience information. We augment our high-quality
audience behavior information with meaningful analysis delivered on a timely
basis, enabling our customers to take decisive action. The analytical services
we provide are structured to deliver information and commentary on a weekly,
monthly and quarterly timeframe. Additionally, we provide timely event-based
reports, such as Internet activity during the Super Bowl. Customers purchasing
our analytical services are entitled to a fixed number of consulting hours,
during which they can have private access to our analysts for strategic
consultation or custom analysis.

    COMPATIBLE, PORTABLE ARCHITECTURE.  All of our information is collected
using proprietary software that is compatible with devices that operate on a
Java-enabled platform. Therefore, we believe that our architecture will
seamlessly integrate with most new types of Internet access devices, enabling us
to obtain useful data from most Internet users regardless of the access device
they use.

STRATEGY

    Our objective is to become the standard for Internet audience measurement
and the worldwide leader in Internet market research. We intend to establish
this leadership position through the following key strategies:

    LEVERAGE OUR STRATEGIC RELATIONSHIPS.  We intend to continue to leverage our
key strategic relationships with Nielsen Media Research and ACNielsen by using
their brands and industry relationships to facilitate the rapid deployment of
our service with leading companies. Since March 1999, we have marketed our
services under the Nielsen//NetRatings brand, and, combining our sales and
marketing efforts with those of Nielsen Media Research, we have deployed our
products and services with over 170 customers. We believe that the continued
adoption of our products and services by leading companies will help facilitate
the broad market acceptance of the Nielsen//NetRatings service as the industry
standard for Internet audience measurement. Similarly, we intend to leverage our
strategic relationship with ACNielsen to deploy our products and services into
multiple international markets.

    INCREASE THE SIZE, SCOPE AND NUMBER OF OUR AUDIENCE MEASUREMENT PANELS.  We
intend to expand the size, scope and number of our audience measurement panels
in order to increase the depth of

                                       39
<PAGE>
information that we can provide our customers. We believe that expanding our
panels will enable us to provide more detailed information regarding e-commerce
trends, as well as more accurate information regarding smaller Internet sites
and more focused advertising campaigns. A significant percentage of Internet
usage takes place at the workplace, and our customers are increasingly requiring
audience measurement information from this user segment. Accordingly, we are
currently working to build an at-work panel through a number of initiatives
including recruiting companies directly and leveraging our current strategic
relationships.

    CAPITALIZE ON OUR ACCESS TO INFORMATION TO DEVELOP NEW PRODUCTS AND ENTER
NEW MARKETS.  We plan to continually innovate and introduce new products that
will capitalize on our access to the extensive Internet activity data that we
collect for our audience measurement products and services. We believe that our
current technological and analytical capabilities allow us to offer the most
accurate, complete and timely information on Internet usage available. As the
volume and complexity of Internet usage increases, we believe that users will
demand increasingly flexible and robust audience measurement products and
services. We intend to continue to devote significant resources to developing
additional technologies that will allow us to create solutions that meet these
requirements. Additionally, we believe that analysis of data is becoming
increasingly important to customers who use Internet audience information, and
we intend to continue to develop new ways to analyze and present the information
we collect. During the past year, we have created advanced reports and analyses
specifically targeted to the investment community and e-commerce providers, and
we intend to introduce similar products for the media segment and online
business-to-business customers. We also intend to leverage our analytical
capabilities to expand and enhance our specialized consulting services.

    EXPAND INTERNATIONALLY.  We intend to capitalize on the global demand for
Internet usage information by establishing panels in major international markets
and expanding our customer base to include international companies. In June
1999, we formed NetRatings KK, a Japanese joint venture, to allow us to provide
our products and services to the Japanese market. In September 1999, we entered
into a joint venture with ACNielsen to develop and maintain Internet audience
measurement panels and to market Nielsen//NetRatings products and services in
other key international markets. Through this joint venture, we plan to develop
audience measurement panels in Australia, Ireland, New Zealand and the United
Kingdom in the first half of 2000 and in Austria, Denmark, Finland, France,
Germany, Norway and Sweden by the end of 2000. We believe that our Internet
measurement solution will provide global companies with the highest-quality
information on worldwide Internet usage and flexible tools to use this
information to make critical business decisions.

    POSITION OURSELVES TO CAPITALIZE ON THE CONVERGENCE OF TELEVISION AND THE
INTERNET.  We intend to position ourselves to become the audience measurement
standard for the converging market for television programming and the Internet.
We believe that the continued convergence of television and the Internet will
require sophisticated products and services that provide meaningful information
about usage behavior. We believe that we will be uniquely positioned for this
convergence through our relationship with Nielsen Media Research, with its
experience and expertise in television audience measurement, combined with our
own Internet measurement technology. We intend to devote substantial resources
and to work with Nielsen Media Research to develop the technologies and research
methodologies that will allow us to be the audience measurement standard for
this convergence.

STRATEGIC RELATIONSHIPS

  STRATEGIC RELATIONSHIP WITH NIELSEN MEDIA RESEARCH

    For nearly 50 years Nielsen Media Research's core business has been to
provide high-quality, comprehensive audience viewing information on the
television industry. The Nielsen ratings are vital to

                                       40
<PAGE>
television program production, distribution and scheduling decision making, and
are the currency for transactions between buyers and sellers of television
advertising time.

    In October 1998, we began a strategic relationship with Nielsen Media
Research to develop and market Internet audience measurement products and
services in the United States and Canada using our technology combined with
Nielsen Media Research's proprietary panel methodology. Through this
relationship, we began developing an expanded Internet audience panel based on
the Nielsen Media Research audience sampling methodology and enhanced versions
of our software, to be marketed under the Nielsen//NetRatings brand. Under our
agreement with Nielsen Media Research, we have the right to use the Nielsen name
in connection with audience measurement and e-commerce consulting services
derived from the panels developed and maintained by Nielsen Media Research. In
March 1999, we launched our Nielsen//NetRatings product and service offerings.
In August 1999, Nielsen Media Research made an equity investment in NetRatings.

    Under the operating agreement governing the relationship, which was entered
into in August 1999, Nielsen Media Research is responsible for the development
and maintenance of the at-home panel that generates the data for the
Nielsen//NetRatings audience measurement service. We are responsible for the
management, support and ongoing development of the data collection and reporting
system. Under the operating agreement, we have formed an operating committee
consisting of two representatives of Nielsen Media Research and two
representatives of NetRatings. The operating committee's responsibilities
include:

    - review of proposed levels of expenses by us and Nielsen Media Research
      related to sales and marketing, research and development and panel
      maintenance;

    - determination of the pricing of the Internet audience measurement
      services;

    - oversight of product quality control; and

    - approval of panel size and other panel-related changes.

    Under the operating agreement, Nielsen Media Research is responsible for
marketing the service to traditional media customers, such as broadcast
television networks, nationally-circulated magazines, news agencies, advertising
agencies and other customers in the United States and Canada that are agreed to
from time to time by Nielsen Media Research and us. We are responsible for
selling to publishers, Internet-based businesses, Fortune 2000 corporations and
financial institutions. We receive 100% of customer billings derived from sales
of all of our products and services and pay Nielsen Media Research a commission
of 35% of our billings for products and services sold by them. For the nine
months ended September 30, 1999, we derived 18% of our total revenue from
Nielsen Media Research generated billings. In the future, we expect this
percentage to decrease, as we increase the size of our sales force and further
expand into international markets.

    We pay Nielsen Media Research ongoing fees for the costs of maintaining the
at-home panel and the costs associated with any expansion of the panel. These
fees are charged at the same rates that Nielsen Media Research charges its own
internal divisions, which are based on Nielsen Media Research's actual cost plus
an allocated portion of its overhead costs. During the nine months ended
September 30, 1999, these fees totaled approximately $3.8 million, representing
approximately 90% of our cost of revenue during that period.

    We have agreed not to sell advertising measurement data in the U.S. or
Canada in conjunction with any product or service provided by any third party
other than Nielsen Media Research. This restriction will terminate if Nielsen
Media Research fails to meet certain annual sales goals that are to be mutually
determined within one year after the date of the operating agreement and
annually thereafter.

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<PAGE>
    The relationship may be terminated in the event of any of the following:

    - mutual agreement of the parties;

    - either party committing a material breach of the agreement, which is not
      defined in the agreement; or

    - Nielsen Media Research's equity ownership of NetRatings falling below 5%
      of NetRatings' outstanding Common Stock, assuming full exercise or
      conversion of all outstanding options, warrants and convertible
      securities.

    Upon a termination of our strategic relationship other than by mutual
consent of the parties or as a result of our breach of the agreement, Nielsen
Media Research will be obligated to provide panel maintenance services for up to
one year thereafter. In addition, in such event, we will continue to have access
to Nielsen Media Research's panel methodology for purposes of maintaining our
at-home panel and the right to use Nielsen Media Research's trademarks for
purposes of marketing our Internet audience measurement products and services
for up to one year following the termination.

  JOINT VENTURE WITH ACNIELSEN

    Since its founding 76 years ago, ACNielsen has become a leading provider of
media research services outside North America. It is also a global leader in
providing business information, analysis and insights to consumer packaged goods
companies, their brokers and retail organizations. ACNielsen offers services to
customers in over 100 countries. Although ACNielsen and Nielsen Media Research
were originally part of the same corporate organization, the two companies are
no longer related.

    In September 1999, we entered into a joint venture with ACNielsen to develop
and maintain audience measurement panels and to market Nielsen//NetRatings
products and services in international markets. The joint venture is operated
through a corporation in which we have a 19.9% voting interest and ACNielsen has
an 80.1% voting interest. These percentages were based on arm's-length
negotiations and estimates of the value of the cash and property that each party
has agreed to contribute to the joint venture. Through the joint venture, we
plan to develop audience measurement panels based in Australia, Ireland, New
Zealand and the United Kingdom in the first half of 2000 and in Austria,
Denmark, Finland, France, Germany, Norway and Sweden by the end of 2000.
ACNielsen has agreed to permit the joint venture to use the Nielsen name free of
charge for so long as the joint venture agreement remains in effect.

    The joint venture's products and services will be based on data collected
from Internet measurement panels that are established and maintained using
ACNielsen's proprietary sampling methodology. Panel members will collect and
deliver their Internet usage data using our proprietary collection software. The
joint venture or ACNielsen will be responsible for establishing and maintaining
the joint venture's audience measurement panels, and ACNielsen will pay the
costs associated with the establishment and maintenance of these panels in the
countries initially targeted by the joint venture. The countries to be initially
targeted by the joint venture will be determined from time to time by an
operating committee consisting of two representatives of NetRatings and two
representatives of the joint venture corporation. We will not be directly
obligated to pay any fees to the joint venture or ACNielsen related to the
establishment or maintenance of panels. However, we will be responsible for our
pro rata portion of the joint venture's capital requirements, based on our
proportionate voting interest, to the extent the joint venture requires capital
other than for the establishment and maintenance of these initial panels.
Moreover, because the identity of these initial panels has not yet been
determined, the proportion of the joint venture's costs that we will be required
to contribute cannot be predicted at this time.

    The joint venture has exclusive rights to market its Internet audience
measurement services in countries outside the United States, Canada and Japan.
We have exclusive rights to market these

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<PAGE>
services in the United States, Canada and Japan. Under this operating agreement,
we have agreed not to offer any Internet audience measurement service in
countries outside the United States, Canada and Japan. In addition, the joint
venture and ACNielsen have agreed not to offer any competing Internet audience
measurement service anywhere in the world. Notwithstanding the foregoing, the
joint venture will have the right to offer such a service in Japan should it not
gain access to the Japanese Internet usage data to which we have access, on the
same terms to which we are subject.

    The joint venture pays us a fee of 10% of its gross revenues from the sale
of products and services relating to Internet audience measurement information
and analysis, subject to a minimum of $7.5 million and a maximum of $15 million
in fees during the five years following the formation of the joint venture.
Revenue from the joint venture's Internet audience measurement services will be
allocated between us and the joint venture depending on the location of the
customer and the location of the panel whose data is used in the service:

    - The joint venture retains 100% of any revenue from services that the joint
      venture sells to customers outside the United States and Canada based on
      data from panels outside those countries.

    - We and the joint venture each retain 50% of any revenue from services that
      we sell to customers in the United States and Canada based on data from
      panels outside those countries or services that the joint venture sells to
      customers outside the United States and Canada based on panel data from
      those countries.

    - The joint venture retains 35% of any revenue from services that the joint
      venture sells to customers inside the United States and Canada based on
      data from panels inside those countries, and we retain 65% of any revenue
      from such services.

    - If either we or the joint venture sells services based on data from a
      combination of panels located both inside and outside the United States
      and Canada, the allocation of revenue is determined by an operating
      committee consisting of two representatives of each company, with any
      decisions requiring a unanimous vote of those present, which must include
      at least one representative of each company.

    The joint venture was initially capitalized through contributions of $1,990
by us for the purchase of common stock and $1,000 by ACNielsen for the purchase
of preferred stock. To complete the initial capitalization of the joint venture,
ACNielsen has agreed to contribute cash to fund the initial roll-out costs,
consisting of the costs incurred to establish Internet audience measurement
panels in each of the countries initially targeted by the joint venture, as such
costs are incurred by the joint venture, and we have granted an exclusive
license with respect to our data collection technology for the covered
territory, subject to specified performance criteria. The schedule for
establishing panels in each country is subject to determination from time to
time by an operating committee consisting of two representatives of NetRatings
and two representatives of the joint venture corporation. ACNielsen has publicly
announced that it expects to spend approximately $50 million over the next two
years to fund the initial roll-out costs of the joint venture. The preferred
stock initially purchased by ACNielsen, together with any additional preferred
stock purchased as part of the funding of the initial roll-out costs, will
continue to have an 80.1% voting interest and be convertible into 80.1% of the
common stock of the joint venture. All preferred stock issued by the joint
venture will have a liquidation preference equal to the original purchase price.

    We have entered into a stockholders agreement with ACNielsen setting forth
procedures for funding the ongoing operations of the joint venture. Apart from
the initial roll-out costs, the capital requirements of the joint venture will
be the responsibility of both companies in proportion to their relative voting
interests in the joint venture. Prior to September 23, 2001, however, ACNielsen
has agreed to advance these capital requirements by either purchasing additional
stock, making loans to the

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<PAGE>
joint venture bearing interest at the prime rate, or arranging loans from third
parties. At the end of this period, the joint venture must repay any such loans
from ACNielsen, and we must reimburse ACNielsen for our pro rata portion of any
such stock purchases, after which the additional stock issued to ACNielsen will
be retired.

    After the funding of the initial roll-out costs, beginning September 23,
2001, the board of directors of the joint venture may make capital calls on the
outstanding shares, acting in its sole discretion. If, after a capital call,
either company defaults on its capital contribution, then the joint venture will
issue to the other company shares of a senior class of preferred stock having a
value equal to that company's capital contribution. In the event of such a
capital call, we may not have sufficient resources to satisfy our contribution
obligations, particularly if Nielsen Media Research is unable to complete its
planned purchase of additional shares of our common stock. Beginning
September 23, 2002, NetRatings has the right to require a capital call if it can
demonstrate that such capital is necessary in order for the joint venture to
exploit commercial opportunities that would be in the best interests of the
joint venture partners. Such a capital call is subject to the default provisions
described above, except that if these provisions would result in ACNielsen
having insufficient equity ownership to include the joint venture in its
consolidated tax returns during 2003 or 2004, then ACNielsen can require that
NetRatings receive convertible debt securities in lieu of the senior class of
preferred stock.

    Under the stockholders agreement, ACNielsen has a right of first refusal to
purchase any shares of the joint venture that we wish to sell to a third party.
If the joint venture does not effect an initial public offering within five
years, we have the right to require ACNielsen to purchase our equity interest at
its fair market value at that time.

PRODUCTS AND SERVICES

    Our products and services provide our customers with the ability to
accurately track and analyze Internet audience behavior, in addition to in-depth
research reports across a variety of Internet-related subjects. Our products and
services, which are marketed under the Nielsen//NetRatings brand, include:

    - INFORMATION SERVICES.  These services provide information such as
      comprehensive traffic measures for Web sites, audience exposure and
      response to advertising banners and audience demographics linked directly
      to site and advertising data;

    - ANALYTICAL SERVICES.  These services are comprised of market research
      reports and analysis for specific markets such as the e-commerce and
      investment communities, and related analyst consultation; and

    - CUSTOM RESEARCH.  This research is performed on an as-requested basis in
      support of customers' special projects.

  INFORMATION SERVICES

    We provide a range of syndicated weekly and monthly Internet audience
measurement reports that can be accessed online. We currently offer two
categories of reports. Our Quick Looks reports provide customers with
comprehensive, pre-defined Internet user behavior and demographic information.
Our Select Views reports provide customers with specific audience information
generated by a powerful, menu-driven interface.

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<PAGE>
    QUICK LOOKS REPORTS

    - WEB SITE REPORTS.  These reports provide key measures of Internet users'
      site activity. Each report contains information on the size and
      demographic composition of the unique audience, the percent of the total
      Internet audience that can be reached at each site, the sites ranked by
      audience size or other criteria, total page views, and pages viewed and
      time spent per person.

<TABLE>
<CAPTION>
               REPORT                                   DESCRIPTION
<S>                                    <C>
- ------------------------------------------------------------------------------------
Top Web Sites by Property              Reports key information for all Web sites
                                       owned by the same entity. For example, a
                                       report for Time Warner would include all
                                       activity information for all of the Time
                                       Warner-owned properties including Warner
                                       Brothers and CNN Web Sites.
- ------------------------------------------------------------------------------------
Top Web Sites by Domain                Reports key information for activity on
                                       individual domains. For example,
                                       www.yahoo.com is considered one domain, and
                                       may consist of numerous individual Web Sites.
- ------------------------------------------------------------------------------------
Top Web Sites by Unique Site           Reports key information by individual site
                                       and top pages within a site. For example,
                                       www.quote.yahoo.com is a unique site within
                                       the www.yahoo.com domain.
- ------------------------------------------------------------------------------------
Top Web Sites by Category              Categorizes sites and domains by content
                                       groupings such as sports, finance, news and
                                       information, allowing comparison of similar
                                       sites.
- ------------------------------------------------------------------------------------
Custom Property                        Provides alternative customized site
                                       consolidations based on client requests.
- ------------------------------------------------------------------------------------
</TABLE>

    - BANNERTRACK REPORTS.  These reports provide detailed audience information
      about Internet banner advertising for use in competitive research,
      advertising and creative analysis, as well as an overall view of current
      advertisers and where they are advertising. These reports allow
      advertising planners to evaluate the creative content of advertising and
      how effectively advertising reaches various audiences. Key measures
      include the number of actual advertising images, banner rank, unique
      audience size and demographic composition, percent of the Internet
      audience that can be reached by each advertisement and click rate.

<TABLE>
<CAPTION>
               REPORT                                   DESCRIPTION
<S>                                    <C>
- ------------------------------------------------------------------------------------
Top Banner Advertisements by           Ranks the top viewed banner advertisements
Impression                             and sponsorship buttons.
- ------------------------------------------------------------------------------------
Advertising by Domain                  Ranks the top advertising sites with
                                       information showing the advertisers and their
                                       respective advertising that appeared on
                                       individual sites.
- ------------------------------------------------------------------------------------
Advertising by Company                 Ranks the top advertisers with detailed
                                       information showing the sites on which they
                                       advertised and identifying their top
                                       advertisements.
- ------------------------------------------------------------------------------------
</TABLE>

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<PAGE>
    - AUDIENCE SUMMARY REPORTS.  These reports provide a comprehensive profile
      of the entire Internet audience including size and demographic composition
      of the unique audience, total page views, number of usage sessions and
      time spent per person.

<TABLE>
<CAPTION>
               REPORT                                   DESCRIPTION
<S>                                    <C>
- ------------------------------------------------------------------------------------
Audience Profile                       Displays overview information for the total
                                       U.S. Internet population.
- ------------------------------------------------------------------------------------
Daily/Hourly Traffic                   Details Audience Profile report information
                                       by specific day and hour.
- ------------------------------------------------------------------------------------
Average Usage                          Displays summary statistics on overall
                                       Internet usage.
- ------------------------------------------------------------------------------------
AOL Audience                           Displays audience size, audience demographic
                                       composition and average time spent within the
                                       America Online proprietary service.
- ------------------------------------------------------------------------------------
</TABLE>

    SELECT VIEWS REPORTS

    Our Select Views reports provide customers with the ability to pinpoint
specific audience information via easy-to-use, menu-driven queries into the
Nielsen//NetRatings database.

<TABLE>
<CAPTION>
               REPORT                                   DESCRIPTION
<S>                                    <C>
- ------------------------------------------------------------------------------------
Site Reports
- ------------------------------------------------------------------------------------
  Demographic Targeting                Allows customers to identify the best sites
                                       to reach a specific demographic population on
                                       the Web. Information includes the size of the
                                       audience and the percent of the audience at a
                                       given site meeting the demographic targeting
                                       criteria.
- ------------------------------------------------------------------------------------
  Audience Profile                     Provides a detailed side-by-side demographic
                                       comparison of audiences at different sites.
- ------------------------------------------------------------------------------------
  Unduplicated Audience                Provides an analysis of the audience overlap
                                       across multiple sites. Details the size and
                                       demographic composition of the site's shared
                                       and exclusive audience.
- ------------------------------------------------------------------------------------
  Trend                                Allows graphical comparison of audience
                                       statistics for multiple sites across
                                       user-selected time periods.
- ------------------------------------------------------------------------------------
BannerTrack Advertising Reports
- ------------------------------------------------------------------------------------
  Demographic Targeting                Allows customers to identify which
                                       advertising has been the most effective in
                                       reaching particular demographic groups.
- ------------------------------------------------------------------------------------
  Audience Profile                     Allows customers to compare the audience size
                                       and demographic composition for selected
                                       advertisements in the same campaign, or
                                       across different advertisers.
- ------------------------------------------------------------------------------------
</TABLE>

                                       46
<PAGE>
  ANALYTICAL SERVICES

    We leverage the information gathered in our core database by offering
analysis that places the data into context, geared toward the specific research
needs of the e-commerce and investment communities. Subscribers to our
analytical services also receive direct access to a NetRatings analyst for a
specific number of hours of private consultation. Our analytical services
include:

    E-COMMERCE STRATEGIES SERVICE

    This series of reports focuses on strategic opportunities with an emphasis
on success factors in particular segments of the e-commerce market.

<TABLE>
<CAPTION>
               REPORT                                   DESCRIPTION
<S>                                    <C>
- ------------------------------------------------------------------------------------
Commerce Data                          Published periodically, analyzes e-commerce
                                       activity, including audience traffic patterns
                                       and "look-to-book" data.
- ------------------------------------------------------------------------------------
Spotlights                             Published weekly, offers both qualitative and
                                       quantitative perspectives to identify major
                                       changes by industry sectors and individual
                                       companies. Compares and contrasts relative
                                       Internet usage of related companies.
- ------------------------------------------------------------------------------------
Hot & Not                              Published monthly, looks at significant
                                       trends in Internet usage affecting specific
                                       industry sectors and individual companies.
- ------------------------------------------------------------------------------------
Trends                                 Published quarterly, contains in-depth
                                       analysis of key industry sectors and their
                                       participants.
- ------------------------------------------------------------------------------------
</TABLE>

    INTERNET INVESTMENT STRATEGIES SERVICE

    This series of reports provides research information for the investment
community, geared to meet the specific needs of market analysts, institutional
investors, brokers and venture capitalists.

<TABLE>
<CAPTION>
               REPORT                                   DESCRIPTION
<S>                                    <C>
- ------------------------------------------------------------------------------------
SnapShots                              On-demand reports provide a timely view of a
                                       profiled company's Internet usage with
                                       qualitative commentary and brief historical
                                       overview.
- ------------------------------------------------------------------------------------
Spotlights                             Published weekly, offers both qualitative and
                                       quantitative perspectives to identify major
                                       changes by industry sectors and individual
                                       companies. Compares and contrasts relative
                                       Internet usage of related companies.
- ------------------------------------------------------------------------------------
Hot & Not                              Published monthly, looks at significant
                                       trends in Internet usage affecting specific
                                       industry sectors and individual companies.
- ------------------------------------------------------------------------------------
Trends                                 Published quarterly, contains in-depth
                                       analysis of key industry sectors and their
                                       participants.
- ------------------------------------------------------------------------------------
</TABLE>

                                       47
<PAGE>
  CUSTOM RESEARCH

    We make research services available to our customers on an as-requested
basis. Because we utilize real-time data collection, we can provide overnight
analysis on a custom basis. In one custom research project, for example, we
analyzed the usage activities of visitors to a selected group of portal sites in
order to learn the percentage of a particular portal's audience that also
visited the other portals. Another custom project studied differences in online
behavior between a site's registered users and unregistered users.

AUDIENCE MEASUREMENT METHODOLOGY

    Our Internet measurement products and services extend to the Internet the
Nielsen Media Research sampling methodology for television audiences by
collecting, aggregating and correlating Internet usage data with demographic
profiles of panel members. The resulting information is organized in a manner
consistent with traditional media research data so that the advertiser or
marketer can integrate Nielsen//NetRatings information into the development of
comprehensive media, marketing and product plans. Our panel of at-home Internet
users is currently more than 37,000 persons, and we are in the process of
increasing the size of this panel.

    We are also developing a panel of at-work Internet users to enable us to
collect data regarding the significant proportion of Internet usage that takes
place at the workplace. We began developing this panel in September 1999. We
recently began collecting data from this panel and expect to recruit more than
3,000 panel members by the end of 1999.

    We believe that the quality of information derived from a sample is directly
related to the quality of the sample. To assure quality, our panel sampling
methodology includes the following critical components:

    ENUMERATION.  Enumeration studies are conducted to determine the total size
and demographic makeup of the Internet user population and are used as the basis
for ensuring that sample behaviors are representative of the total audience
population. Our principal competitor in the market for Internet audience
measurement services conducts enumeration studies on a quarterly basis. In order
to more accurately gauge the size and shape of the rapidly changing Internet
user universe, we conduct our enumeration studies on a monthly basis.

    SAMPLE DESIGN.  For a sample to be representative of the total Internet user
population, the selection process must be random. In addition, the higher the
cooperation rate among selected individuals, the more representative the sample
and the more reliable the sample data. Our at-home panel is constructed using a
process called random digit dialing, which involves recruiting panel members by
calling randomly selected telephone numbers. Telephone numbers are randomly and
systematically selected with equal probability, with adjustments made to account
for households with more than one phone number. To maximize the cooperation
rate, households are called up to 15 times in an attempt to make contact.
Eligible households, namely, those with a PC and Internet access, are recruited
to participate in the panel. Those that agree to participate are mailed a
membership packet that includes tracking software and installation instructions
and are given a small savings bond for their participation. Eligible households
that decline to participate in the panel, households without Internet access,
non-residential telephone numbers and non-working or non-contacted telephone
numbers are called again at six-month intervals.

    SAMPLE MANAGEMENT.  Given the continuing rapid growth of the Internet, the
online population changes in size and composition faster than audiences of other
major media. Our sample management process strives for ongoing cooperation from
existing panel members. We also recontact previous non-Internet households to
ensure that new telephone numbers are included in the random sampling process.

                                       48
<PAGE>
TECHNOLOGY

    Through the use of our proprietary tracking software, we developed the
following audience measurement capabilities:

    - daily and weekly activity reports made possible by collection of user
      activity data in real time;

    - advertising banner tracking and reporting by banner, advertiser and
      domain; and

    - tracking e-commerce purchase activity and related audience behavior.

NetRatings audience tracking software has the following characteristics:

    - collects real-time, comprehensive Web activity and AOL proprietary online
      service activity;

    - collects the same data in the same way, regardless of whether the user is
      accessing the Internet via a PC, Macintosh, UNIX or other platform, and
      provides portability to non-PC Internet access devices such as television
      set-top boxes and Internet gaming devices;

    - automatically measures banner advertisement viewing and clicking,
      e-commerce activity, cached page views and page loading times;

    - requires virtually no panelist intervention once installed and can be
      automatically upgraded, allowing functional enhancement without panelist
      interaction; and

    - automatically encrypts all panelist activity data prior to transmission.

    We have also designed the NetRatings reporting system for flexibility of
information delivery and ease of use. We publish weekly as well as monthly data.
Our reporting schedule is 72 hours after the end of the period for weekly data
and 10 days after the end of the period for monthly data. Information is
organized in consistently formatted, easy-to-use tables with extensive
drill-down capabilities and search utilities. Additional "self-service" custom
queries are supported via the menu-driven interface. Online help accompanies all
tables. The Web-based design ensures continual access to information regardless
of the user's location.

                                       49
<PAGE>
CUSTOMERS

    More than 170 customers currently use our services for a wide range of
purposes including planning, buying and selling Internet-based advertising;
planning and developing e-commerce strategies; gaining competitive intelligence;
understanding Internet user behavior; and analyzing and tracking Internet
investment opportunities. The following table is a list of our top four
customers based on contract value in each of our principal customer sectors.

<TABLE>
<CAPTION>
CUSTOMER SECTOR                                  REPRESENTATIVE CUSTOMERS
<S>                          <C>                              <C>
- ---------------------------------------------------------------------------------------------
Advertising Agencies         Avenue A                         Grey
                             Carat                            TBWA/Chiat/Day
- ---------------------------------------------------------------------------------------------

Advertisers and E-Commerce   Bell South                       Gateway
Companies                    Drugstore.com                    REI
- ---------------------------------------------------------------------------------------------

Media Companies              Discovery Communications         Universal
                             Time Warner                      Univision
- ---------------------------------------------------------------------------------------------

Internet Companies           America Online                   Microsoft
                             Lycos                            Net2Phone
- ---------------------------------------------------------------------------------------------

Financial Services           C.E. Unterberg, Towbin           CIBC World Markets
Companies                    Chase Manhattan                  KPMG
- ---------------------------------------------------------------------------------------------
</TABLE>

SALES AND MARKETING

    Nielsen//NetRatings products and services are sold by NetRatings and Nielsen
Media Research in their respective markets. Under the operating agreement
governing our strategic relationship with Nielsen Media Research, NetRatings has
responsibility for selling to publishers, Internet-based business, Fortune 2000
corporations and financial institutions. As of September 30, 1999, we had 15
sales representatives located in Milpitas, California and Chatham, New Jersey.
The Nielsen Media Research sales effort is focused on its traditional customers:
advertising agencies, television and cable networks, and local station
affiliates. Nielsen Media Research is also responsible for selling to companies
with whom it has strategic relationships, including such companies as Procter &
Gamble, America Online, Microsoft and Viacom. NetRatings sales representatives
receive a base salary and are eligible for commissions based on revenue and
sales goals. Nielsen Media Research is paid a commission for its sales of the
Nielsen//NetRatings services.

    Our primary marketing objective is to leverage and build upon the
brand-awareness of the Nielsen//NetRatings name throughout our target audiences.
We use public relations activities to gain extensive mention of our products and
services as well as use of, and/or reference to, our data by both traditional
and Internet press, and financial and industry analysts. Further company and
product visibility is gained through speaking engagements and participation at
industry events by our executive officers. In addition, we provide daily updates
on unique audience size at top Internet sites to the Bloomberg service that
distributes online financial information to 140,000 terminals worldwide. Each
week, Advertising Age magazine features an entire page of audience and
advertising data from our service. We generate additional brand-awareness by
providing our data for the acknowledgement of ownership through partnerships
with other publishers, media services and Internet companies such as AdAuction,
AdKnowledge, NetGravity and Reuters.

                                       50
<PAGE>
INTERNATIONAL OPERATIONS

    In June 1999, we commenced our international expansion by establishing a
joint venture, NetRatings KK, in which we currently hold a minority interest
with several Japanese investors holding the remaining interests. NetRatings KK
is responsible for building and maintaining a Japanese audience measurement
panel and introducing our products and services to the Japanese market. We have
licensed our data collection and reporting technology to NetRatings KK for use
in Japan. NetRatings KK is currently modifying this technology for use in Japan
and is in the process of recruiting a Japan-market panel. The initial audience
measurement service is scheduled to be available in the first quarter of 2000.

    In September 1999, we entered into a joint venture with ACNielsen to develop
and maintain Internet audience measurement panels and to market products and
services under the Nielsen//NetRatings brand in other key international markets.
See "--Strategic Relationships--Joint Venture with ACNielsen."

RESEARCH AND DEVELOPMENT

    We believe that our future success and our ability to become the standard
for Internet audience measurement information and analysis will depend in large
part on our ability to continually develop new and enhanced products and
services. Accordingly, we are committed to the investment of significant
resources in research and product development activities. Our research and
development activities are organized into three functional areas: measurement
and data collection technology development, reporting systems development and
operations, and panel operations and support.

    During 1997, 1998 and the nine months ended September 30, 1999, our research
and development expenses were $994,000, $1.2 million and $1.8 million,
respectively. As of September 30, 1999, we had 18 employees engaged in research
and development activities.

INTELLECTUAL PROPERTY

    Our success and ability to compete is dependent in part on the protection of
our proprietary technology and information. We rely on a combination of patent,
copyright, trademark and trade secret laws, as well as confidentiality
agreements and licensing arrangements, to establish and protect our proprietary
rights. Although we have filed for a patent on certain aspects of our
technology, we cannot assure you that a patent will issue as a result of this
pending application or that any patent that may be issued will be upheld.
Despite our efforts to protect our proprietary rights, existing patent,
copyright, trademark and trade secret laws afford only limited protection, and
there can be no assurance that our intellectual property rights, if challenged,
will be upheld as valid or will be adequate to protect our proprietary
technology and information. In addition, the laws of some foreign countries may
not protect our proprietary rights to the same extent as do the laws of the
United States. Attempts may be made to copy or reverse engineer aspects of our
technology or to obtain and use information that we regard as proprietary.
Litigation may be necessary in the future to enforce our intellectual property
rights or to determine the validity and scope of the proprietary rights of
others. This litigation could result in substantial costs and diversion of
resources and could significantly harm our business.

    To date, we have not been notified that our technology infringes the
proprietary rights of third parties. However, in the future third parties may
assert patent, copyright, trademark and other intellectual property rights to
technologies that are important to our business. Any claims asserting that our
products infringe or may infringe proprietary rights of third parties, if
determined adversely to us, could significantly harm our business. Any claims,
with or without merit, could be time-consuming, result in costly litigation,
divert the efforts of our technical and management personnel or require us to
enter into royalty or licensing agreements, any of which could significantly
harm our business. Royalty or licensing agreements, if required, may not be
available on terms acceptable to us, if at all. In the

                                       51
<PAGE>
event a claim against us was successful and we could not obtain a license to the
relevant technology on acceptable terms or license a substitute technology to
avoid infringement, our business would be significantly harmed.

COMPETITION

    The market for Internet audience measurement and analysis is new and rapidly
evolving and becoming increasingly competitive. In the market for Internet
audience measurement services, our principal competitor is Media Metrix, which
we believe to be the leading provider of such services, based on annual
revenues. We are not aware of any other significant competitors in this market,
although we expect competition in this market to intensify in the future. With
respect to provision of analytical services, we compete with companies such as
Forrester Research, Gartner Group and Jupiter Communications that provide
Internet market research and industry analysis based on data derived from
surveys.

    We believe that the market for Internet audience measurement services will
eventually gravitate toward a uniform standard, based on data collected by a
single service provider, that will allow companies to make meaningful decisions
regarding online advertising. We therefore believe that one leading provider is
likely to emerge in the market for Internet audience measurement services. Media
Metrix has provided Internet audience measurement services since 1995 and, as
the "first mover" in this market, has a head start in becoming the industry
standard for such services.

    We believe that the principal competitive factors in our market are:

    - the development of independent, reliable measurement panels that are
      representative of the entire target audience;

    - the timeliness of reported results;

    - the breadth and depth of measurement services offered and their
      flexibility and ease of use;

    - the ability to provide quality analytical services derived from Internet
      audience measurement information;

    - the ability to offer products and services in international markets; and

    - pricing.

    Most of our competitors have longer operating histories, larger customer
bases, greater brand recognition and significantly greater financial and
marketing resources than we have. In addition, some of our competitors may be
able to:

    - devote greater resources to marketing and promotional campaigns;

    - adopt more aggressive pricing policies; or

    - devote more resources to technology and systems development.

In light of these factors, we may be unable to compete successfully in our
market.

                                       52
<PAGE>
EMPLOYEES

    As of September 30, 1999, we had 50 full-time employees, with:

    - 18 in research and development;

    - 27 in sales and marketing; and

    - 5 in general and administration.

    Our employees are not covered by a collective bargaining agreement. We have
never experienced an employment-related work stoppage and consider our employee
relations to be good.

FACILITIES

    Our corporate headquarters are located in Milpitas, California. We lease
approximately 9,700 square feet for our headquarters which includes research and
development, sales and marketing and general and administrative operations,
under leases expiring between January 2000 and September 2000. We also lease a
sales office in Chatham, New Jersey. We recently entered into a lease for
approximately 20,000 square feet for our new headquarters in Milpitas, which
commences in February 2000 and expires in February 2005.

PENDING LITIGATION

    On November 4, 1999, PaineWebber Incorporated filed a lawsuit against us in
the Supreme Court of the State of New York for the County of New York. The suit
involves an agreement entered into in May 1999 in which we engaged PaineWebber
to act as our financial advisor with respect to a potential strategic
transaction. The specific transaction for which PaineWebber was engaged was not
consummated. However, the lawsuit alleges that we have breached our obligations
under the agreement by failing to pay PaineWebber a fee based upon our
subsequent sale of equity securities to Nielsen Media Research and by failing to
retain PaineWebber as a managing underwriter for this offering. The complaint
seeks damages in the aggregate amount of not less than $1.9 million and
reimbursement for PaineWebber's attorneys' fees relating to the dispute. We
believe, based on consultation with our counsel, that we have substantial
defenses to PaineWebber's claims, and we intend to defend the lawsuit
vigorously. We expect to incur substantial legal fees and expenses in connection
with the litigation, and it may also result in the diversion of our internal
resources. As a result, our defense of this litigation, regardless of its
eventual outcome, will likely be costly and time consuming. The litigation is in
the preliminary stage, and we are unable to predict its final outcome. However,
an adverse outcome could materially affect our results of operations and
financial position.

                                       53
<PAGE>
                                   MANAGEMENT

DIRECTORS, EXECUTIVE OFFICERS AND OTHER KEY EMPLOYEES

    The following table sets forth our directors, executive officers, other key
employees and the additional persons nominated by Nielsen Media Research to
serve on our board of directors after Nielsen Media Research becomes a majority
stockholder, their ages and the positions currently held by them:

<TABLE>
<CAPTION>
NAME                                       AGE                            POSITION
- ----                                       ---                            --------
<S>                                      <C>        <C>
David J. Toth (1)......................        43   President, Chief Executive Officer and Director
Jack R. Lazar (1)......................        34   Vice President, Chief Financial Officer and Secretary
Frank Sammann (1)......................        57   Executive Vice President of Worldwide Sales
Charles L. ("Tim") Meadows (1).........        45   Senior Vice President of Marketing
Simon Chen (1).........................        50   Vice President of Engineering
Stephen J. Gross.......................        44   Vice President of Finance and Controller
Robert L. Hooven.......................        46   Vice President and General Manager of International
                                                      Operations
Barbara D. Jarzab......................        42   Vice President of Research
William C. Schaub......................        53   Vice President of Business Panel Development
Allen P. Weiner........................        46   Vice President of Analytical Services
David A. Norman (2)(3).................        63   Chairman of the Board
Jack T. Serfass (3)....................        36   Director
James J. Geddes, Jr. (2)...............        49   Director
David H. Harkness (2)..................        55   Director
Michael P. Connors (3).................        44   Director
John A. Dimling........................        61   Director Nominee
Thomas A. Mastrelli....................        52   Director Nominee
Gerald S. Hobbs........................        58   Director Nominee
Daniel O'Shea..........................        46   Director Nominee
Charles E. Leonard.....................        63   Director Nominee
</TABLE>

- ------------------------
(1) Executive Officer
(2) Member of Audit Committee
(3) Member of Compensation Committee

    DAVID J. TOTH co-founded NetRatings in July 1997 and has served as our
President and Chief Executive Officer and a member of our board of directors
since our inception. From November 1992 to June 1997, Mr. Toth was employed by
the Network Products Group of Hitachi Computer Products, Inc., as a Director
from November 1992 to October 1993 and as Vice President from October 1993 to
June 1997. Mr. Toth holds a B.S. in Electrical Engineering from the University
of Pittsburgh.

    JACK R. LAZAR has served as our Vice President, Chief Financial Officer and
Secretary since August 1999. From January 1996 to August 1999, Mr. Lazar was
Vice President, Chief Financial Officer and Secretary of Apptitude, Inc., a
developer and manufacturer of network management solutions. From June 1992 to
December 1995, Mr. Lazar was employed by Electronics For Imaging, Inc., a
developer of color servers and color management software, first as Financial
Planning Manager and later as Controller and Principal Financial and Accounting
Officer. From September 1987 to June 1992, Mr. Lazar worked in various audit
positions at Price Waterhouse (now PricewaterhouseCoopers LLP). Mr. Lazar holds
a B.S.C. from Santa Clara University and is a certified public accountant.

    FRANK SAMMANN has served as our Executive Vice President of Worldwide Sales
since October 1999. From February 1999 to October 1999, Mr. Sammann was
President and Chief Executive Officer of Decisive Technology, a customer
satisfaction survey provider. From July 1998 through January 1999, Mr. Sammann
was employed as a recruiter for Montgomery West, an executive search firm.
Mr. Sammann served as Vice President of Corporate Accounts for JTS Corporation,
a disk drive manufacturer, from February 1996 to June 1998. From August 1992 to
February 1996, Mr. Sammann

                                       54
<PAGE>
was Vice President of Far East Sales and Marketing for Conner Peripherals, a
manufacturer of disk drives. Mr. Sammann was also Senior Vice President of Sales
for Dataquest, a market research company, for over 10 years. Mr. Sammann holds a
B.S. in Journalism and Marketing from the University of Oregon.

    CHARLES L. ("TIM") MEADOWS co-founded NetRatings in July 1997 and has served
as our Senior Vice President of Marketing since September 1999. He also served
as our Vice President of Marketing from our inception to September 1999 and as a
member of our board of directors from our inception to August 1999. From
May 1996 to July 1997, Mr. Meadows was self-employed as a marketing consultant.
From July 1991 to May 1996, Mr. Meadows was employed by Cornerstone
Imaging, Inc., a document imaging company, initially as Director of Marketing
and later as Vice President, Marketing. From September 1988 to July 1991,
Mr. Meadows was Director of Strategic Planning at Hitachi Computer
Products, Inc. Mr. Meadows holds a B.S. in Business Administration and an M.B.A.
from the University of California at Berkeley.

    SIMON CHEN co-founded NetRatings in July 1997 and has served as our Vice
President of Engineering since our inception. From September 1989 through
June 1997, Mr. Chen was employed as a Senior Software Development Manager for
Hitachi Computer Products, Inc. Mr. Chen holds an M.S. in Electronic Engineering
from the South Dakota School of Mines and Technology and an M.B.A. from the
University of San Diego.

    STEPHEN J. GROSS has served as our Vice President of Finance and Controller
since February 1999. From June 1998 to January 1999, Mr. Gross was employed as
Vice President of Finance and Controller of Globalcast Communications, Inc., a
software company. From October 1997 to May 1998, Mr. Gross was engaged as a
consultant to Informix Software, Inc., Inhale Therapeutic Systems and
Softbankforums. From September 1987 to October 1997, Mr. Gross was a Senior Vice
President of Operations and Corporate Controller for Koll-Dove Global
Disposition Services, LLC, an auction services company. From July 1982 to
September 1987, Mr. Gross was a partner in the firm of Gross & Gralitzer,
Certified Public Accountants. Mr. Gross holds a B.S. degree from California
State University at Northridge.

    ROBERT L. HOOVEN has served as our Vice President and General Manager of
International Operations since October 1999. He served as our Vice President of
Sales and Business Development from August 1997 to October 1999. From July 1993
to August 1997, Mr. Hooven was employed by Cornerstone Imaging, Inc. and its
affiliated companies in a variety of sales and management positions, most
recently Vice President of Worldwide Sales. Mr. Hooven holds a B.S. in Business
Administration from Norwich University.

    BARBARA D. JARZAB has served as our Vice President of Research since
December 1997. From December 1994 to December 1997, Ms. Jarzab was employed as a
Senior Vice President of the Analytic Consulting and Testing Division of
Information Resources, Inc. From December 1991 to December 1994, Ms. Jarzab was
a Vice President, InfoScan Household Panel Product Management Group for
Information Resources, Inc. Ms. Jarzab holds a B.S. in Sociology and Economics
from DePaul University and an M.A. in Sociology from the University of Chicago.

    WILLIAM C. SCHAUB has served as our Vice President of Business Panel
Development since May, 1999. From January 1998 to April 1999, Mr. Schaub was
Vice President of Computer Research at the Gartner Group. From December 1995 to
December 1997, Mr. Schaub was the Director of Computer Research at
Dataquest, Inc., a market research company. From May, 1993 to December, 1995,
Mr. Schaub was a Sales Executive at Dataquest. Mr. Schaub holds a B.S. in
Business from California State University, Sacramento and an M.B.A. from St.
Mary's College.

    ALLEN P. WEINER has served as our Vice President of Services since
March 1999. From December 1994 to March 1999, Mr. Weiner was employed as Vice
President/Chief Analyst for Dataquest, Inc.

                                       55
<PAGE>
From June 1993 to November 1994, Mr. Weiner was a Manager in the Electronic
Information Services Department of the Chronicle Publishing Company/San
Francisco Newspaper Agency. From June 1993 to September 1993, Mr. Weiner was an
Operations Manager for Chronicle CityLine. From June 1990 to June 1993,
Mr. Weiner was Editor of Interactive World for Virgo Publishing, Inc.
Mr. Weiner holds a B.A. in American Studies from Muhlenberg College and an M.A.
in Communications and Theater from Temple University.

    DAVID A. NORMAN has served as a member of our board of directors since
December 1997 and as our Chairman since November 1998. Since February 1998,
Mr. Norman has been a private investor in high technology companies. From
March 1994 to February 1998, Mr. Norman was Chairman and CEO of Technically
Elite, Inc., a computer networking company. Mr. Norman was the founder,
President and Chief Executive Officer of Businessland, Inc. Mr. Norman also
founded Dataquest, a market research company. Mr. Norman is also a director of
FVC.com, Inc. and a number of private companies. Mr. Norman holds a B.S. in
Mechanical Engineering from the University of Minnesota and an M.S. in
Industrial Engineering from Stanford University.

    JACK T. SERFASS has served as a member of our Board of Directors since
August 1997. Mr. Serfass is a co-founder and co-chairman of Bowstreet
Software, Inc., a web services automation company. From April 1990 to
June 1997, Mr. Serfass was CEO and President of Preferred Systems, Inc., a
network management company of which he was a co-founder. Mr. Serfass holds a
B.S. degree in Management Information Systems from the University of Rhode
Island.

    JAMES J. GEDDES, JR. has served as a member of our Board of Directors since
August 1999. Since September 1995, Mr. Geddes has been a Managing Director of
Trans Cosmos U.S.A. Inc., a venture capital investing company. From
November 1992 to September 1995, Mr. Geddes was President and Chief Executive
Officer of InVision Systems Corporation, a video conferencing software company.
Mr. Geddes also serves as a director of several private companies. Mr. Geddes
holds a B.S. in Electrical Engineering from the University of Maryland.

    DAVID H. HARKNESS has served as a member of our Board of Directors since
September, 1999. Mr. Harkness has been employed by Nielsen Media Research, Inc.
since 1975, most recently as Senior Vice President of Planning and Development.
Mr. Harkness holds a B.A. in Chemistry from Bates College and an M.B.A. in
Marketing and Finance from the University of Connecticut.

    MICHAEL P. CONNORS has served as a member of our Board of Directors since
September 1999. Since May 1996, Mr. Connors has been the Vice Chairman and a
Director of ACNielsen. From April 1995 to November 1996, he was a Senior Vice
President and Chief Human Resources Officer of The Dun & Bradstreet Corporation,
a business information company. From 1989 to May 1995, Mr. Connors was Senior
Vice President for American Express Travel Related Services. Mr. Connors holds a
B.S. in Business Administration and Finance from the University of Kansas and an
M.A. in Human Resource Management from Central Michigan University.

    JOHN A. DIMLING has been nominated by Nielsen Media Research to serve on our
board of directors after Nielsen Media Research becomes a majority stockholder.
He has served as President and Chief Executive Officer of Nielsen Media
Research, Inc. since July 1998. He was previously President and Chief Operating
Officer from July 1993 to June 1998. Mr. Dimling holds an A.B. in Mathematics
from Dartmouth College, an M.S. in Industrial Administration from Carnegie
Mellon University and a J.D. from George Washington University.

    THOMAS A. MASTRELLI has been nominated by Nielsen Media Research to serve on
our board of directors after Nielsen Media Research becomes a majority
stockholder. He has been Chief Operating Officer of VNU USA, Inc., a subsidiary
of VNU N.V., a Netherlands-based publishing and information company and the
corporate parent of Nielsen Media Research, since January 1999. From April 1998
to December 1998, Mr. Mastrelli served as Executive Vice President and General
Manager of VNU USA,

                                       56
<PAGE>
Inc. From 1981 to April 1998, he was a partner at the public accounting and
consulting firm of Leslie Sufrin and Company. He holds a B.B.A. from Pace
University and an M.B.A. from Fordham University.

    GERALD S. HOBBS has been nominated by Nielsen Media Research to serve on our
board of directors after Nielsen Media Research becomes a majority stockholder.
He has served as Chairman and Chief Executive Officer of VNU USA, Inc. since
1994 and has served as a member of the Executive Board of Directors of VNU N.V.
since 1998. Prior to joining VNU N.V., Mr. Hobbs was the Chief Executive Officer
of BPI Communications, a wholly-owned subsidiary of VNU USA, Inc., from 1994 to
1998. He has also served as both the Chairman of the Board and a Director of the
American Business Press, and is currently a Director of the Advertising Council,
Inc., BPA International, Luxuryfinder.com and the Construction Market Data
Group.

    DANIEL O'SHEA has been nominated by Nielsen Media Research to serve on our
board of directors after Nielsen Media Research becomes a majority stockholder.
He has served as the Chief Operating Officer of VNU Marketing Information Inc.,
a provider of precision-marketing solutions, since November 1997. From August
1991 to October 1997, Mr. O'Shea was Chief Operating Officer of Bill
Communications, a publisher of busines-to-business magazines and an
organizer/producer of trade shows. Mr. O'Shea holds a B.S. in Economics from
Lehman College and an M.B.A. from Pace University.

    CHARLES E. LEONARD has been nominated by Nielsen Media Research to serve on
our board of directors after Nielsen Media Research becomes a majority
stockholder. He has served as President of VNU Marketing Information, Inc., a
provider of precision-marketing solutions, since May 1991. Mr. Leonard holds a
B.S. in Management Technology from Massachusetts Institute of Technology and an
M.B.A. from the Wharton School.

BOARD COMPOSITION

    Our board of directors is currently fixed at six directors. Each of our
executive officers is elected by the board of directors and serves at its
discretion. Each of our officers and directors, other than nonemployee
directors, devotes his full time to the affairs of NetRatings. Our nonemployee
directors devote such time to our affairs as is necessary to discharge their
duties. There are no family relationships among any of our directors, officers
or key employees.

    Pursuant to a stockholders agreement among NetRatings, Nielsen Media
Research and the other holders of our preferred stock, we have agreed to use our
best efforts to cause a representative of Nielsen Media Research to be elected
to our board of directors at each annual meeting of stockholders, or to cause
two such representatives to be elected in the event Nielsen Media Research
exercises both of its warrants in full. Pursuant to a further agreement between
NetRatings and Nielsen Media Research, after Nielsen Media Research completes
its purchase of additional shares of common stock in connection with this
offering and exercises both of its warrants in full, we will be obligated to use
our best efforts to cause a sufficient number of such representatives to be
elected at each annual meeting such that those representatives will constitute a
majority of our board of directors. See "Related Party Transactions--Strategic
Relationships--Strategic Alliance with Nielsen Media Research."

BOARD COMMITTEES

    The audit committee of our board of directors recommends the appointment of
our independent auditors, reviews our internal accounting procedures and
financial statements and consults with and reviews the services provided by our
independent auditors, including the results and scope of their audit. The audit
committee currently consists of Messrs. Geddes, Harkness and Norman.

                                       57
<PAGE>
    The compensation committee of our board of directors reviews and recommends
to the board the compensation and benefits of all executive officers of
NetRatings, and establishes and reviews general policies relating to
compensation and benefits of NetRatings employees. The compensation committee
currently consists of Messrs. Norman, Geddes and Serfass.

COMPENSATION OF DIRECTORS

    Directors of NetRatings do not receive cash compensation for their services
as directors or members of committees of the board of directors. We reimburse
directors for their reasonable expenses incurred in attending meetings of the
board of directors.

    In June 1998, we issued to Messrs. Norman and Serfass options to purchase
210,000 shares of common stock and 42,500 shares of common stock, respectively,
at an exercise price of $0.10. In June 1999, we issued to Mr. Norman an option
to purchase 210,000 shares of common stock at an exercise price of $0.50. In
August 1999, we issued to Mr. Geddes an option to purchase 25,000 shares of
common stock at an exercise price of $6.22 per share. Each of these options
vests at the rate of 1/4 of the shares after one year and 1/48 of the shares
monthly thereafter. Each option is fully-exercisable, subject to our right to
repurchase any unvested shares at the original purchase price in the event that
the optionee no longer is a director.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

    Our compensation committee currently consists of Messrs. Norman, Connors and
Serfass. In May 1998, Mr. Norman made a loan to us of $100,000, bearing interest
at 9% per year. In July 1999, Mr. Norman cancelled this indebtedness in exchange
for 165,206 shares of our Series B preferred stock. In connection with these
transactions, we also issued to Mr. Norman a warrant to purchase 78,989 shares
of Series B preferred stock at an exercise price of $0.63 per share. In
August 1999, we issued to Mr. Norman two full-recourse promissory notes having
an aggregate principal amount of $125,160 in connection with the exercise of
stock options. The notes bear interest at 5% per annum and are due in August
2002. See "Related Party Transactions--Financing Transactions" and "--Loans to
Director."

    In September 1999, we entered into a joint venture with ACNielsen to develop
and maintain audience measurement panels and to market Nielsen//NetRatings
products and services in international markets. The joint venture is operated
through a corporation to which we initially contributed $1,990 in capital in
exchange for a 19.9% ownership interest and ACNielsen contributed $1,000 in
exchange for an 80.1% interest. Mr. Connors is an executive officer of
ACNielsen, which is the beneficial owner of 19.0% of our outstanding common
stock. See "Related Party Transactions--Strategic Relationships."

EXECUTIVE COMPENSATION

  SUMMARY COMPENSATION INFORMATION

    The following table sets forth information regarding compensation received
during the year ended December 31, 1998 by our Chief Executive Officer and the
two other executive officers whose total salary and bonus earned during the
fiscal year ended December 31, 1998 exceeded $100,000:

                                       58
<PAGE>
                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                        LONG-TERM
                                                                       COMPENSATION
                                                                       ------------
                                                           ANNUAL       NUMBER OF
                                                        COMPENSATION    SECURITIES
                                                        ------------    UNDERLYING
NAME AND PRINCIPAL POSITION                                SALARY        OPTIONS
- ---------------------------                             ------------   ------------
<S>                                                     <C>            <C>
David J. Toth.........................................    $151,731         --
  President and Chief Executive Officer
Charles L. ("Tim") Meadows............................    $141,615        173,000
  Vice President of Marketing
Simon Chen............................................    $107,914        129,750
  Vice President of Engineering
</TABLE>

  OPTION GRANTS

    The following table sets forth information regarding grants of stock options
to each of the executive officers named in the Summary Compensation Table during
the year ended December 31, 1998. All of these options were granted under our
1998 Stock Plan. The percentage of total options set forth below is based on an
aggregate of 567,750 options granted to employees during the year ended
December 31, 1998. All options were granted at the fair market value of our
common stock, as determined by the Board of Directors, on the date of grant.
Potential realizable values are net of exercise price, but before taxes
associated with exercise. Amounts representing hypothetical gains are those that
could be achieved for the options if exercised at the end of the option term.
The assumed 5% and 10% rates of stock price appreciation are provided in
accordance with rules of the SEC, based on a common stock value of $0.10 at the
beginning of the option term, and do not represent NetRatings' estimate or
projection of the future stock price.

                OPTIONS GRANTED IN YEAR ENDED DECEMBER 31, 1998

<TABLE>
<CAPTION>
                                                    INDIVIDUAL GRANTS
                                    --------------------------------------------------    POTENTIAL REALIZABLE VALUE
                                    NUMBER OF     % OF TOTAL                              AT ASSUMED ANNUAL RATES OF
                                    SECURITIES     OPTIONS                                 STOCK PRICE APPRECIATION
                                    UNDERLYING    GRANTED TO    EXERCISE                        FOR OPTION TERM
                                     OPTIONS     EMPLOYEES IN     PRICE     EXPIRATION   -----------------------------
NAME                                 GRANTED     FISCAL YEAR    ($/SHARE)      DATE           5%              10%
- ----                                ----------   ------------   ---------   ----------   -------------   -------------
<S>                                 <C>          <C>            <C>         <C>          <C>             <C>
David J. Toth.....................         --          --            --           --              --              --
Charles L. ("Tim") Meadows........    173,000        30.5%        $0.10       6/5/08      $1,087,988      $2,757,174
Simon Chen........................    129,750        22.9         $0.10       6/5/08      $  815,991      $2,067,881
</TABLE>

  OPTION EXERCISES AND FISCAL YEAR-END HOLDINGS

    The table below sets forth the number of shares of common stock acquired and
the value and the number of shares of common stock subject to exercisable and
unexercisable options held as of December 31, 1998 by each of the executive
officers named in the Summary Compensation Table. No executive officers
exercised any options during that year.

                                       59
<PAGE>
   AGGREGATE OPTION EXERCISES IN FISCAL 1998 AND VALUES AT DECEMBER 31, 1998

<TABLE>
<CAPTION>
                                 NUMBER OF SHARES UNDERLYING        VALUE OF UNEXERCISED
                                    UNEXERCISED OPTIONS AT        IN-THE-MONEY OPTIONS AT
                                           12/31/98                     12/31/98(1)
                                 ----------------------------   ----------------------------
NAME                             EXERCISABLE    UNEXERCISABLE   EXERCISABLE    UNEXERCISABLE
- ----                             ------------   -------------   ------------   -------------
<S>                              <C>            <C>             <C>            <C>
David J. Toth..................            --             --              --             --
Charles L. ("Tim") Meadows.....        97,312         75,688              --             --
Simon Chen.....................        72,984         56,766              --             --
</TABLE>

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

       (1)  None of these options was in-the-money at this date.

STOCK PLANS

  1998 STOCK PLAN

    NetRatings' 1998 Stock Plan was adopted by the board of directors and
approved by the stockholders on January 30, 1998. NetRatings is authorized to
issue up to 2,965,000 shares of common stock under this plan. The 1998 Stock
Plan is currently being administered by the board of directors. The plan allows
grants of incentive stock options, within the meaning of Section 422 of the
Internal Revenue Code, to employees, including officers and employee directors.
In addition, it allows grants of nonstatutory options and stock purchase rights
to employees, non-employee directors and consultants. The plan expires in
January 2008, but may be terminated sooner by the board of directors.

    The exercise price of incentive stock options granted under the 1998 Stock
Plan must not be less than the fair market value of a share of the common stock
on the date of grant. In the case of nonstatutory stock options, the exercise
price must not be less than 85% of the fair market value of a share of the
common stock on the date of grant. With respect to any optionee who owns stock
representing more than 10% of the voting power of all classes of NetRatings'
outstanding capital stock, the exercise price of any incentive stock option must
be equal to at least 110% of the fair market value of a share of the common
stock on the date of grant, and the term of the option may not exceed five
years. The terms of all other options may not exceed ten years. The aggregate
fair market value (determined as of the date of option grant) of the common
stock for which an incentive stock option may become exercisable for the first
time may not exceed $100,000 in any calendar year. Rights to acquire restricted
stock may also be granted under the 1998 Stock Plan. Stock purchase rights
generally are granted subject to a repurchase option in favor of NetRatings that
expires pursuant to a vesting schedule. The purchase price of these awards must
be less than 85% of the fair market value of a share of common stock on the
grant date. The Board of Directors or any committee administering the 1998 Stock
Plan has discretion to determine vesting schedules and exercise requirements, if
any, of all awards granted under the plan. However, the plan provides that in
connection with a change in control, if the acquiring corporation fails to
assume the plan's outstanding awards or replace them with substantially
equivalent new awards, all awards will become immediately exercisable in full.

    As of September 30, 1999, 555,000 shares of common stock had been issued
pursuant to the 1998 Stock Plan, options to purchase 1,722,000 shares of common
stock, with a weighted average exercise price of $2.04, were outstanding, and
688,000 shares remained available for future grants.

  1999 EMPLOYEE STOCK PURCHASE PLAN

    NetRatings' 1999 employee stock purchase plan was adopted by the Board of
Directors in October 1999. A total of 250,000 shares of common stock are
reserved for issuance under the plan. This plan, which is intended to qualify
under Section 423 of the Internal Revenue Code, will be administered by the
Board of Directors. Employees, including officers and employee directors, are
eligible to participate in the plan if they are employed by NetRatings for more
than 20 hours per week,

                                       60
<PAGE>
do not beneficially own more than 5% or more of the Company's stock (treating
shares subject to outstanding options as beneficially owned) and work 6 months
or more per calendar year. The plan will be implemented during sequential
six-month offering periods, the first of which will commence on the effective
date of this offering and will terminate on July 31, 2000. After the effective
date of this offering, offering periods under the plan will generally begin on
February 1 and August 1 of each year.

    The employee stock purchase plan permits eligible employees to purchase
NetRatings common stock through payroll deductions, which may not exceed 15% of
the employee's base salary. Stock may be purchased under the plan at a price
equal to 85% of the fair market value of NetRatings common stock on either the
first or the last day of the offering period, whichever is lower. Employees may
end their participation in the offering at any time during the offering period,
and participation ends automatically on termination of a participant's
employment with NetRatings. Participants may not purchase shares of common stock
having a value, measured at the beginning of the offering period, greater than
$25,000 in any calendar year or more than 2,500 shares in any offering period.

INDEMNIFICATION OF DIRECTORS AND EXECUTIVE OFFICERS AND LIMITATION OF LIABILITY

    Section 145 of the Delaware General Corporation Law authorizes a court to
award, or a corporation's board of directors to grant, indemnity to directors
and officers in terms sufficiently broad to permit indemnification under some
circumstances for liabilities, including reimbursement for expenses incurred,
arising under the Securities Act of 1933.

    As permitted by the Delaware General Corporation Law, NetRatings has adopted
provisions in its certificate of incorporation which provide that its directors
shall not be personally liable for monetary damages to NetRatings or its
stockholders for a breach of fiduciary duty as a director, except liability for:

    - a breach of the director's duty of loyalty to NetRatings or its
      stockholders;

    - acts or omissions not in good faith or which involve intentional
      misconduct or a knowing violation of law;

    - an act related to our unlawful stock repurchase or payment of a dividend
      under Section 174 of the Delaware General Corporation Law; or

    - transactions from which the director derived an improper personal benefit.

    These limitations of liability do not affect the availability of equitable
remedies such as injunctive relief or rescission. NetRatings' certificate of
incorporation also authorizes NetRatings to indemnify its officers, directors
and other agents to the full extent permitted under Delaware law.

    As permitted by the Delaware General Corporation Law, NetRatings' bylaws
provide that:

    - NetRatings is required to indemnify its directors and officers to the
      fullest extent permitted by the Delaware General Corporation Law, subject
      to limited exceptions;

    - NetRatings is required to advance expenses, as incurred, to its directors
      and officers in connection with a legal proceeding to the fullest extent
      permitted by the Delaware General Corporation Law, subject to limited
      exceptions; and

    - the rights provided in the bylaws are not exclusive.

    NetRatings intends to enter into separate indemnification agreements with
each of its directors and officers which may be broader than the specific
indemnification provisions contained in the Delaware General Corporation Law.
These indemnification agreements require NetRatings, among other things, to
indemnify its officers and directors against liabilities that may arise by
reason of their status or service as directors or officers, other than
liabilities arising from willful misconduct. These

                                       61
<PAGE>
indemnification agreements also require NetRatings to advance any expenses
incurred by the directors or officers as a result of any proceeding against them
as to which they could be indemnified and to obtain directors' and officers'
insurance if available on reasonable terms.

    At present, there is no pending litigation or proceeding involving any of
NetRatings' directors, officers, employees or agents where indemnification by
NetRatings is sought. In addition, NetRatings is not aware of any threatened
litigation or proceeding which may result in a claim for indemnification.

    NetRatings maintains directors' and officers' liability insurance and
intends to continue to maintain this insurance in the future.

                                       62
<PAGE>
                           RELATED PARTY TRANSACTIONS

FINANCING TRANSACTIONS

    Since our inception, we have issued common stock and preferred stock to our
directors, executive officers and our 5%-or-greater stockholders in a series of
financing transactions. Shares of our Series B, Series C and Series D
convertible preferred stock are convertible into common stock at the rate of one
share of common stock for every two shares of preferred stock. All outstanding
shares of our preferred stock will be automatically converted into common stock
immediately prior to the closing of this offering.

  SERIES B PREFERRED STOCK FINANCING

    In May and November 1998, we borrowed a total of $895,000 from a group of
lenders to whom we issued promissory notes bearing interest at the annual rate
of 9%. These notes provided that all outstanding principal and accrued interest
would be automatically converted into Series B convertible preferred stock in
the next equity financing. In July 1999, we sold a total of 1,477,151 shares of
Series B convertible preferred stock to a group of investors at a purchase price
of approximately $0.63 per share, or $935,037 in the aggregate. At this time,
the May 1998 promissory notes were converted into shares of Series B convertible
preferred stock and each lender received a warrant to purchase additional shares
of Series B convertible preferred stock, at an exercise price of approximately
$0.63 per share, in an amount having an aggregate exercise price equal to 50% of
the amount lent by the lender. Persons who participated in these transactions
included the following:

<TABLE>
<CAPTION>
                                                                  AMOUNT     CURRENT                  AMOUNT    CURRENT
INVESTOR                        LOAN AMOUNT    SERIES B SHARES     PAID      VALUE(1)    WARRANTS      PAID     VALUE(2)
- --------                       -------------   ---------------   --------   ----------   ---------   --------   --------
<S>                            <C>             <C>               <C>        <C>          <C>         <C>        <C>
David A. Norman..............    $100,000          165,206       $100,000   $1,404,251    78,989     $50,000    $621,407
David J. Toth................    $ 50,000           82,603         50,000      702,126    39,495      25,000     310,708
Charles L. Meadows...........    $ 25,000           41,302         25,000      351,067    19,748      12,500     155,358
Simon Chen...................    $ 25,000           41,302         25,000      351,067    19,748      12,500     155,358
</TABLE>

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

(1) Calculated on an as-converted basis based on the initial public offering
    price of $17.00 per share.

(2) Calculated on an as-converted basis based on the initial public offering
    price of $17.00 per share, less the exercise price of approximately $1.27
    per share.

Mr. Norman is chairman of our board of directors and the beneficial owner of
5.1% of our outstanding common stock. Mr. Toth is our President and Chief
Executive Officer, a member of our board of directors and the beneficial owner
of 17.6% of our outstanding common stock. Messrs. Meadows and Chen are executive
officers of our company and the beneficial owners of 6.3% and 4.2%,
respectively, of our outstanding common stock.

  SERIES C PREFERRED STOCK FINANCING

    In August 1999, we sold an aggregate of 6,413,751 shares of Series C
convertible preferred stock at a purchase price of approximately $3.11 per
share, or $20,000,000 in the aggregate, to the following investors:

<TABLE>
<CAPTION>
                                                          SERIES C      AMOUNT        CURRENT
INVESTOR                                                   SHARES        PAID        VALUE(1)
- --------                                                  ---------   -----------   -----------
<S>                                                       <C>         <C>           <C>
Trans Cosmos............................................  3,527,563   $11,000,000   $29,984,285
Nielsen Media Research..................................  2,886,188     9,000,000    24,532,598
</TABLE>

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

(1) Calculated on an as-converted basis based on the initial public offering
    price of $17.00 per share.

                                       63
<PAGE>
Trans Cosmos and Nielsen Media Research are the beneficial owners of 19.3% and
48.0%, respectively, of our outstanding common stock, and two of our directors,
James J. Geddes, Jr. and David H. Harkness, are affiliates of Trans Cosmos and
Nielsen Media Research, respectively.

    In connection with this financing transaction, we entered into additional
agreements with Nielsen Media Research superseding the term sheet that had
previously governed our strategic relationship and issued warrants entitling
Nielsen Media Research to purchase shares of common stock after the completion
of this offering. Also in connection with this financing transaction, Trans
Cosmos made a cash investment in our Japanese joint venture. See "--Strategic
Relationships--Strategic Relationship with Nielsen Media Research," "--Strategic
Relationships--Japanese Joint Venture" and "Business--Strategic
Relationships--Strategic Relationship with Nielsen Media Research."

  SERIES D PREFERRED STOCK FINANCING

    In September 1999, we sold an aggregate of 4,887,050 shares of Series D
convertible preferred stock at a purchase price of approximately $3.14 per
share, or $15,342,893 in the aggregate, to the following investors:

<TABLE>
<CAPTION>
                                                                        AMOUNT        CURRENT
INVESTOR                                            SERIES D SHARES      PAID        VALUE(1)
- --------                                            ---------------   -----------   -----------
<S>                                                 <C>               <C>           <C>
ACNielsen.........................................     3,992,454      $12,536,306   $33,935,859
Trans Cosmos......................................       492,029        1,544,971     4,182,247
Nielsen Media Research............................       402,567        1,264,060     3,421,820
</TABLE>

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

(1) Calculated on an as-converted basis based on the initial public offering
    price of $17.00 per share.

ACNielsen, Trans Cosmos and Nielsen Media Research are the beneficial owners of
19.0%, 19.3% and 48.0%, respectively, of our outstanding common stock, and three
of our directors, Michael P. Connors, James J. Geddes, Jr. and David H.
Harkness, are affiliates of ACNielsen, Trans Cosmos and Nielsen Media Research,
respectively.

LOANS TO DIRECTOR

    In August 1999, we loaned Mr. Norman $125,160 in connection with the
exercise of stock options. In exchange for the loan, Mr. Norman gave us two
full-recourse promissory notes bearing interest at 5% per annum, which are due
and payable in August 2002.

STRATEGIC RELATIONSHIPS

  STRATEGIC RELATIONSHIP WITH NIELSEN MEDIA RESEARCH

    In August 1999, simultaneously with our sale of Series C preferred stock to
Nielsen Media Research, the beneficial owner of 58.4% of our outstanding common
stock, we entered into additional agreements with Nielsen Media Research
superseding the term sheet that had previously governed our strategic
relationship. In connection with this transaction, we granted Nielsen Media
Research two warrants to purchase our common stock. The first warrant is
exercisable for 553,054 shares of common stock at an exercise price of $7.20 per
share, and the second is exercisable for 6,000,000 shares of common stock at an
exercise price of $12.00 per share or 60% of the price at which our common stock
is sold in this offering, whichever is lower. These warrants become exercisable
upon the effectiveness of the registration statement related to this offering
and expire on December 31, 2001, in the case of the first warrant, and
December 31, 2004, in the case of the second warrant.

    We also granted Nielsen Media Research the right to purchase additional
shares of our common stock in connection with this offering, at the public
offering price. Nielsen Media Research has the

                                       64
<PAGE>
right to purchase a sufficient number of shares of our common stock to enable it
to own 54% of our outstanding common stock on a fully-diluted basis, that is,
assuming the exercise of all outstanding options and warrants (including the
warrants it holds) immediately following this offering. If Nielsen Media
Research elects to exercise this right and purchase all or a portion of the
stock it is entitled to purchase, our other stockholders will be entitled to
sell to Nielsen Media Research, at the public offering price, a portion of the
shares it has elected to purchase, subject to our right to limit the aggregate
number of shares to be sold by other stockholders, in consultation with the
underwriters in the offering. Each stockholder may sell a pro rata portion of
the total number of shares that our stockholders may sell to Nielsen Media
Research, based on the number of shares held by that stockholder divided by the
number of shares held by all of our stockholders that have the right to sell
stock to Nielsen Media Research. If the shares tendered by our other
stockholders are not sufficient to satisfy Nielsen Media Research's election to
purchase additional shares, then Nielsen Media Research will have the right to
purchase the excess directly from us.

    Nielsen Media Research has agreed to exercise the foregoing purchase right
as to a number of shares that would result in it owning 52% of our outstanding
common stock on a fully-diluted basis, subject to the expiration or early
termination of the required waiting period under the Hart-Scott-Rodino Antitrust
Improvements Act of 1976 and associated regulations. Several of our other
stockholders have agreed to sell an aggregate of 580,293 of their shares of
common stock to Nielsen Media Research in connection with its exercise of this
right. Accordingly, we expect that Nielsen Media Research will purchase
8,607,546 shares directly from us upon the exercise of this right. The
stockholders who have agreed to sell shares to Nielsen Media Research include
the following directors and executive officers:

<TABLE>
<CAPTION>
                                              SHARES    AGGREGATE PROCEEDS(1)
                                              -------   ----------------------
<S>                                           <C>       <C>
David J. Toth...............................  296,814         $5,045,838
Charles L. ("Tim") Meadows..................   89,271         $1,517,607
Simon Chen..................................   75,000         $1,275,000
Jack T. Serfass.............................   35,000         $  595,000
</TABLE>

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

       (1) Based on the initial public offering price of $17.00 per share.

    In addition, we entered into a stockholders agreement with Nielsen Media
Research and the other holders of our preferred stock which, among other things,
grants Nielsen Media Research the right to nominate one director for election to
our board of directors, or two such directors in the event that Nielsen Media
Research exercises both of its warrants in full. These rights will terminate
when Nielsen Media Research ceases to own at least 5% of our outstanding stock,
assuming the exercise of all outstanding options and warrants.

    In November 1999, we entered into an additional agreement with Nielsen Media
Research. Pursuant to this agreement, Nielsen Media Research agreed to purchase
a number of shares of our common stock such that it will own 52% of our
outstanding shares on a fully-diluted basis, measured as of the closing date of
this offering, subject to the expiration or early termination of the
Hart-Scott-Rodino waiting period. If, upon the consummation of this purchase,
Nielsen Media Research would not own a majority of our common stock on a
fully-diluted basis, it will have the right to purchase enough additional shares
to obtain such a majority, provided that in no case may it purchase more than
the number of shares that would have given it 54% of our fully-diluted
outstanding shares if that percentage were measured as of the closing date of
this offering. The agreement further provides that, if Nielsen Media Research
completes its purchase of additional shares of common stock in connection with
this offering and exercises both of its warrants in full, we will elect a
sufficient number of Nielsen Media Research representatives to our board of
directors such that its representatives will constitute a majority of our board.
Nielsen Media Research is currently the

                                       65
<PAGE>
beneficial owner of 48.0% of our outstanding common stock, and one of our
directors, David H. Harkness, is an affiliate of Nielsen Media Research. See
"Risk Factors--Our officers, directors and principal stockholders may exert
substantial control over us" and "Business--Strategic Relationships--Strategic
Alliance With Nielsen Media Research."

  JOINT VENTURE WITH ACNIELSEN

    In September 1999, we established a joint venture with ACNielsen to develop
and maintain audience measurement panels and to market our products and services
in key international markets. In connection with the formation of this joint
venture, we licensed our data collection and reporting technology to the joint
venture and ACNielsen licensed its panel development methodology to the joint
venture and agreed to contribute cash to fund the joint venture's start-up
costs. ACNielsen is the beneficial owner of 19.0% of our outstanding common
stock, and one of our directors, Michael P. Connors, is an affiliate of
ACNielsen. See "Business--Strategic Relationships--Joint Venture with
ACNielsen."

  JAPANESE JOINT VENTURE

    In June 1999, we and several Japanese investors established a joint venture,
NetRatings KK, to which we licensed our data collection and reporting technology
and the other investors contributed cash. In August 1999, Trans Cosmos, a
beneficial owner of 19.3% of our common stock, invested approximately
$2.3 million in NetRatings KK. See "Business--International Operations."

ASSET PURCHASE FROM HITACHI

    We purchased our original data collection technology from Hitachi in January
1998 in exchange for cash in the amount of $100,000. At the time of this
transaction, Hitachi owned more than 5% of our outstanding stock.

                                       66
<PAGE>
                             PRINCIPAL STOCKHOLDERS

    The table below sets forth information known to us regarding the beneficial
ownership of our common stock as of October 31, 1999, and as adjusted to reflect
the sale of the common stock offered hereby, by:

    - each stockholder who is known by us to beneficially own more than 5% of
      our outstanding common stock;

    - each of our executive officers listed on the Summary Compensation Table
      under "Management;"

    - each of our directors and director nominees; and

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

The address for Messrs. Toth, Meadows and Norman is c/o NetRatings, Inc.,
830 Hillview Court, Suite 225, Milpitas, CA 95035.

<TABLE>
<CAPTION>
                                                         SHARES BENEFICIALLY     SHARES BENEFICIALLY
                                                          OWNED BEFORE THE         OWNED AFTER THE
                                                             OFFERING(1)             OFFERING(1)
                                                        ---------------------   ---------------------
BENEFICIAL OWNER                                          NUMBER     PERCENT      NUMBER     PERCENT
- ----------------                                        ----------   --------   ----------   --------
<S>                                                     <C>          <C>        <C>          <C>
5% STOCKHOLDERS:
Nielsen Media Research, Inc.(2).......................   8,197,431     48.0%    17,385,271     58.5%
  299 Park Avenue
  New York, NY 10171

Trans Cosmos U.S.A. Inc...............................   2,009,795     19.1      2,009,795     13.8
  777 108th Avenue N.E.
  Bellevue, WA 98004

ACNielsen Corporation.................................   1,996,227     19.0      1,996,227     13.7
 177 Broad Street
  Stamford, CT 06901
EXECUTIVE OFFICERS AND DIRECTORS:
David J. Toth(3)......................................   1,858,543     17.6      1,858,543     12.8
Charles L. ("Tim") Meadows(4).........................     671,087      6.3        671,087      4.6
David A. Norman(5)....................................     542,097      5.1        542,097      3.7
Simon Chen(6).........................................     448,446      4.2        448,446      3.1
Jack T. Serfass(7)....................................     105,000        *        105,000        *
Jack R. Lazar.........................................          --       --             --       --
Frank Sammann.........................................          --       --             --       --
David H. Harkness(8)..................................   8,197,431     48.0     17,385,271     58.5
John A. Dimling(8)....................................   8,197,431     48.0     17,385,271     58.5
Thomas A. Mastrelli(8)................................   8,197,431     48.0     17,385,271     58.5
Gerald S. Hobbs(8)....................................   8,197,431     48.0     17,385,271     58.5
Daniel O'Shea(8)......................................   8,197,431     48.0     17,385,271     58.5
Charles E. Leonard(8).................................   8,197,431     48.0     17,385,271     58.5
James J. Geddes, Jr.(9)...............................   2,034,795     19.3      2,034,795     14.0
Michael P. Connors(10)................................   1,996,227     19.0      1,996,227     13.7
All executive officers and directors as a group
  (10 persons)(11)....................................  15,853,626     91.0%    24,926,903     83.3%
</TABLE>

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

*   Less than 1%.

                                       67
<PAGE>
(1) The number of shares beneficially owned and the percentage of shares
    outstanding are based on (a) 10,548,424 shares outstanding as of
    October 31, 1999 and (b) 14,548,424 shares outstanding after completion of
    this offering, assuming no exercise of the underwriters' over-allotment
    option. Beneficial ownership is determined in accordance with the rules of
    the SEC and generally includes voting or investment power with respect to
    securities. All shares of common stock subject to options and warrants
    exercisable within 60 days following October 31, 1999 are deemed to be
    outstanding and beneficially owned by the person holding those options for
    the purpose of computing the number of shares beneficially owned and the
    percentage of ownership of that person. They are not, however, deemed to be
    outstanding and beneficially owned for the purpose of computing the
    percentage ownership of any other person. Except as indicated in the other
    footnotes to the table and subject to applicable community property laws,
    based on information provided by the persons named in the table, these
    persons have sole voting and investment power with respect to all shares of
    the common stock shown as beneficially owned by them.

(2) Includes 6,553,054 shares issuable upon exercise of warrants that will
    become exercisable upon the completion of this offering. The number of
    shares beneficially owned after the offering also includes 8,607,546 shares
    that Nielsen Media Research has agreed to purchase from us and 580,293
    shares that Nielsen Media Research has agreed to purchase from other
    stockholders in connection with this offering.

(3) Includes 19,742 shares issuable upon exercise of warrants that are currently
    exercisable. Mr. Toth has agreed to sell 296,814 shares to Nielsen Media
    Research in connection with this offering.

(4) Includes 120,562 shares issuable upon exercise of options that are currently
    exercisable or will become exercisable within 60 days after October 31, 1999
    and 9,874 shares issuable upon exercise of warrants that are currently
    exercisable. Mr. Meadows has agreed to sell 89,271 shares to Nielsen Media
    Research in connection with this offering.

(5) Includes 39,494 shares issuable upon exercise of warrants that are currently
    exercisable.

(6) Includes 90,421 shares issuable upon exercise of options that are currently
    exercisable or will become exercisable within 60 days after October 31, 1999
    and 9,874 shares issuable upon exercise of warrants that are currently
    exercisable. Mr. Chen has agreed to sell 75,000 shares to Nielsen Media
    Research in connection with this offering.

(7) Includes 42,500 shares issuable upon exercise of options that are currently
    exercisable. Mr. Serfass has elected to sell 35,000 shares to Nielsen Media
    Research in connection with this offering.

(8) Consists of shares beneficially owned by Nielsen Media Research.
    Mr. Harkness is a member of our board and Messrs. Dimling, Mastrelli, Hobbs,
    O'Shea and Leonard have been nominated to join our board after Nielsen Media
    Research acquires a majority of our outstanding common stock.
    Messrs. Harkness and Dimling are executive officers of Nielsen Media
    Research, and Messrs. Mastrelli, Hobbs, O'Shea and Leonard are executive
    officers of Nielsen Media Research's parent corporation, VNU N.V., or of
    other subsidiaries of VNU N.V. Accordingly, these individuals may be deemed
    to share voting or investment control with respect to these shares. Each of
    these individuals disclaims beneficial ownership of these shares. The
    address for Messrs. Harkness, Mastrelli, Hobbs, O'Shea and Leonard is c/o
    Nielsen Media Research Inc., 299 Park Avenue, New York, NY 10171.

(9) Consists of 2,009,796 shares held of record by Trans Cosmos and 25,000
    shares issuable upon exercise of options held by Mr. Geddes that are
    currently exercisable. Mr. Geddes is a Managing Director of Trans Cosmos and
    may be deemed to share voting or investment control with respect to these
    shares. Mr. Geddes disclaims beneficial ownership of these shares. The
    address for Mr. Geddes is c/o Trans Cosmos U.S.A. Inc., 777 108th Avenue
    N.E., Bellevue, WA 98004.

                                       68
<PAGE>
(10) Consists of shares held of record by ACNielsen. Mr. Connors is an executive
    officer of ACNielsen and may be deemed to share voting or investment control
    with respect to these shares. Mr. Connors disclaims beneficial ownership of
    these shares. The address for Mr. Connors is c/o ACNielsen Corporation, 177
    Broad Street, Stamford, CT 06901.

(11) Includes shares held of record by Nielsen Media Research, Trans Cosmos and
    ACNielsen. See footnotes 2, 3 and 4. Also includes 278,483 shares issuable
    upon exercise of options that are currently exercisable or will become
    exercisable within 60 days after October 31, 1999 and 6,632,038 shares
    issuable upon exercise of warrants that are currently exercisable or will
    become exercisable upon completion of this offering.

                                       69
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK

    Upon the closing of this offering, NetRatings' authorized capital stock will
consist of 200,000,000 shares of common stock, $0.001 par value per share, and
5,000,000 shares of preferred stock, $0.001 par value per share.

    The following is a summary of the material terms of NetRatings' common stock
and preferred stock. Please see NetRatings' certificate of incorporation, filed
as an exhibit to the registration statement of which this prospectus is a part,
for more detailed information.

COMMON STOCK

    As of September 30, 1999, there were 3,892,332 shares of NetRatings common
stock outstanding, after giving effect to the proposed one-for-two reverse split
of the common stock, held of record by 24 stockholders. The holders of
NetRatings common stock are entitled to one vote for each share held of record
on all matters submitted to a vote of stockholders. Upon the closing of this
offering, holders of a majority of the shares of common stock entitled to vote
in any election of directors may elect all of the directors standing for
election. Subject to preferences applicable to any outstanding preferred stock,
holders of common stock are entitled to receive ratably any dividends declared
by the board out of funds legally available therefor. See "Dividend Policy." In
the event of a liquidation, dissolution or winding up of NetRatings, holders of
common stock are entitled to share ratably in the assets remaining after payment
of liabilities and the liquidation preferences of any outstanding preferred
stock. Holders of NetRatings common stock have no preemptive, conversion or
redemption rights. Each outstanding share of common stock is, and all shares of
common stock to be outstanding upon the closing of this offering will be, fully
paid and non-assessable.

CONVERTIBLE PREFERRED STOCK

    Upon the closing of this offering, all NetRatings convertible preferred
stock outstanding will be converted into an aggregate of 6,626,476 shares of
common stock. Thereafter, up to 5,000,000 shares of undesignated preferred stock
will be authorized for issuance. NetRatings' Board of Directors has the
authority, without further action by its stockholders, to issue preferred stock
in one or more series. In addition, the Board may fix the rights, preferences
and privileges of any preferred stock it determines to issue. Any or all of
these rights may be superior to the rights of the common stock. Preferred stock
could thus be issued quickly with terms calculated to delay or prevent a change
in control of NetRatings or to make removal of management more difficult.
Additionally, the issuance of preferred stock may decrease the market price of
NetRatings' common stock. At present, NetRatings has no plans to issue any
shares of preferred stock.

WARRANTS

    As of September 30, 1999, after giving effect to the one-for-two reverse
split of the common stock and the conversion of all outstanding shares of
preferred stock into common stock, there were outstanding warrants to purchase
common stock as follows:

    - warrants to purchase an aggregate of 353,471 shares at an exercise price
      of $1.27 per share, which expire upon the closing of this offering;

    - a warrant to purchase 553,054 shares at an exercise price of $7.20 per
      share, expiring in December 2001;

    - a warrant to purchase 6,000,000 shares at an exercise price of $10.20 per
      share, expiring in December 2004;

    - warrants to purchase 47,618 shares at an exercise price of $0.42, expiring
      in December 2006;

    - warrants to purchase 9,434 shares at an exercise price of $2.12, expiring
      in December 2006;

                                       70
<PAGE>
    - a warrant to purchase 26,415 shares at an exercise price of $2.12,
      expiring in April 2008; and

    - a warrant to purchase 43,293 shares at an exercise price of $6.24 per
      share, expiring in September 2004.

REGISTRATION RIGHTS

    Under the Second Restated Rights Agreement dated as of September 23, 1999,
by and among NetRatings and various NetRatings stockholders, holders of an
aggregate of 13,659,763 shares of NetRatings common stock that are outstanding
or issuable upon exercise of warrants have registration rights with respect to
their shares of common stock.

    Beginning six months after the date of this prospectus, these holders have
the right to require NetRatings, on not more than two occasions, to file a
registration statement under the Securities Act to register their shares at
NetRatings' expense. Demand for this registration must be made by holders of at
least 50% of the shares that are entitled to this registration. NetRatings may,
under some circumstances, defer this registration for up to 180 days, and the
underwriters of the offering under that registration have the right, subject to
some limitations, to limit the number of shares included. These holders also
have the right to demand not more than two registrations during any twelve-month
period on Form S-3, provided that the reasonably anticipated aggregate offering
price would exceed $500,000.

    If NetRatings proposes to register any of its securities under the
Securities Act for NetRatings' own account or for the account of other security
holders, these holders are entitled to notice of that registration and have the
right to include some or all of their shares of common stock in that
registration, at NetRatings' expense, subject to marketing and other
limitations.

ANTITAKEOVER PROVISIONS

  DELAWARE LAW

    NetRatings will be subject to Section 203 of the Delaware General
Corporation Law regulating corporate takeovers, which prohibits a Delaware
corporation from engaging in any business combination with an "interested
stockholder," for a period of three years following the time that such
stockholder became an interested stockholder unless:

    - prior to the date of the transaction, the board of directors of the
      corporation approved either the business combination or the transaction
      which resulted in the stockholder becoming an interested stockholder;

    - upon consummation of the transaction which resulted in the stockholder
      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, excluding for purposes of determining the
      number of shares outstanding (a) shares owned by persons who are directors
      and also officers, and (b) shares owned by employee stock plans in which
      employee participants do not have the right to determine confidentially
      whether shares held subject to the plan will be tendered in a tender or
      exchange offer; or

    - on or subsequent to the date of the transaction, the business combination
      is approved by the board and authorized at an annual or special meeting of
      stockholders, and not by written consent, by the affirmative vote of at
      least 66-2/3% of the outstanding voting stock which is not owned by the
      interested stockholder.

    Except as otherwise specified in Section 203, an "interested stockholder" is
defined to include (a) any person that is the owner of 15% or more of the
outstanding voting securities of the corporation, or is an affiliate or
associate of the corporation and was the owner of 15% or more of the outstanding
voting stock of the corporation at any time within three years immediately prior
to the date of determination and (b) the affiliates and associates of any such
person.

                                       71
<PAGE>
  CERTIFICATE OF INCORPORATION AND BYLAW PROVISIONS

    Provisions of NetRatings' certificate of incorporation and bylaws, which
will become effective upon the closing of this offering, may have the effect of
making it more difficult for a third party to acquire, or of discouraging a
third party from attempting to acquire, control of NetRatings. These provisions
could cause the price of NetRatings common stock to decrease. Some of these
provisions allow NetRatings to issue preferred stock without any vote or further
action by the stockholders, eliminate the right of stockholders to act by
written consent without a meeting and eliminate cumulative voting in the
election of directors. These provisions may make it more difficult for
stockholders to take specific corporate actions and could have the effect of
delaying or preventing a change in control of NetRatings.

TRANSFER AGENT AND REGISTRAR

    The transfer agent and registrar for the common stock is Continental Stock
Transfer & Trust Company, 2 Broadway, New York, NY 10004, (212) 509-4000.

LISTING

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

                                       72
<PAGE>
                        SHARES ELIGIBLE FOR FUTURE SALE

    Sales of substantial amounts of our common stock in the public market
following the offering could cause the market price of our common stock to fall
and could affect our ability to raise capital on terms favorable to us.

    Of the 14,872,280 shares to be outstanding after the offering, assuming that
the underwriters do not exercise their over-allotment option, only the 4,000,000
shares of common stock sold in this offering will be freely tradable without
restriction in the public market, unless the shares are held by "affiliates," as
that term is defined in Rule 144(a) under the Securities Act of 1933. For
purposes of Rule 144, an "affiliate" of an issuer is a person that, directly or
indirectly through one or more intermediaries, controls, or is controlled by or
is under common control with, the issuer. The remaining 10,872,280 shares of
common stock that will be outstanding after the offering are "restricted
securities" under the Securities Act and may be sold in the public market upon
the expiration of the holding periods under Rule 144, described below, subject
to the volume, manner of sale and other limitations of Rule 144.

    In general, under Rule 144 as currently in effect, a person who has
beneficially owned shares for at least one year, including an "affiliate," is
entitled to sell, within any three-month period, a number of shares that does
not exceed the greater of:

    - 1% of the then outstanding shares of our common stock (approximately
      148,723 shares immediately following the offering); or

    - the average weekly trading volume during the four calendar weeks preceding
      filing of notice of the sale of shares of common stock.

    Sales under Rule 144 are also subject to certain manner-of-sale provisions,
notice requirements and the availability of current public information about us.
A stockholder who is deemed not to have been an "affiliate" of ours at any time
during the three months preceding a sale, and who has beneficially owned
restricted shares for at least two years, would be entitled to sell shares under
Rule 144(k) without regard to the volume limitations, manner of sale provisions
or public information requirements.

    Based on the foregoing, the shares of restricted stock that will be
outstanding after the offering will become eligible for resale in the public
market as follows:

<TABLE>
<CAPTION>
   NUMBER OF SHARES/PERCENT
OUTSTANDING AFTER THE OFFERING          DATE WHEN SHARES BECOME AVAILABLE IN THE PUBLIC MARKET
- ------------------------------         ---------------------------------------------------------
<C>                                    <S>
       3,902,124/26.2%                 180 days after the date of this prospectus pursuant to
                                       agreements between the stockholders and the underwriters
                                       or NetRatings, provided that the underwriters can waive
                                       this restriction at any time. 3,127,500 of these shares
                                       will also be subject to sales volume restrictions under
                                       Rule 144 under the Securities Act.
       6,970,156/46.8%                 Upon expiration of applicable one-year holding periods
                                       under Rule 144, which will expire between July 23 and
                                       November 30, 2000, subject to sales volume restrictions
                                       under Rule 144.
</TABLE>

    In addition, as of September 30, 1999, there were outstanding warrants to
purchase 6,679,815 shares of common stock, in addition to warrants that have
been exercised after that date, and options to purchase 1,722,000 shares of
common stock, of which options for 430,000 shares were fully vested. An
additional 1,688,000 shares are reserved for issuance under our 1998 Stock Plan.
We intend to register the shares of common stock issuable or reserved for
issuance under this plan as soon as practicable following the date of this
prospectus.

                                       73
<PAGE>
    Holders of 13,659,763 shares of common stock that are outstanding or
issuable upon exercise of warrants are entitled to registration rights with
respect to these shares for resale under the Securities Act. If these holders,
by exercising their registration rights, cause a large number of shares to be
registered and sold in the public market, these sales could harm the market
price for our common stock. These registration rights may not be exercised prior
to the expiration of 180 days from the date of this prospectus. See "Description
of Capital Stock--Registration Rights."

LOCK-UP ARRANGEMENTS

    Along with our officers and directors, all holders of our preferred stock,
common stock, warrants and options have agreed not to sell or otherwise dispose
of any shares of common stock for a period of 180 days after the date of this
prospectus without the prior written consent of Lehman Brothers.

                                       74
<PAGE>
                                  UNDERWRITING

    Under the underwriting agreement, which is filed as an exhibit to the
registration statement relating to this prospectus, Lehman Brothers Inc., Banc
of America Securities LLC, CIBC World Markets Corp. and C.E. Unterberg, Towbin
are acting as representatives of each of the underwriters named below. Under the
underwriting agreement, each of the underwriters has agreed to purchase from us
the respective number of shares of common stock shown opposite its name below:

<TABLE>
<CAPTION>
                                                              NUMBER OF
UNDERWRITERS                                                   SHARES
- ------------                                                  ---------
<S>                                                           <C>
Lehman Brothers Inc.........................................  1,712,500
Banc of America Securities LLC..............................    765,000
CIBC World Markets Corp.....................................    600,000
C.E. Unterberg, Towbin......................................    342,500
Bear Stearns & Co. Inc. ....................................     75,000
Hambrecht & Quest LLC.......................................     75,000
Merrill Lynch & Co. ........................................     75,000
Schroder & Co. Inc. ........................................     75,000
Brean Murray & Co., Inc. ...................................     40,000
Dain Rauscher...............................................     40,000
C.L. King & Associates, Inc. ...............................     40,000
McDonald Investments Inc. ..................................     40,000
Pacific Crest Securities....................................     40,000
Sands Brothers & Co., Ltd. .................................     40,000
Volpe Brown Whelan & Company, LLC ..........................     40,000
                                                              ---------
    Total...................................................  4,000,000
                                                              =========
</TABLE>

    The underwriting agreement provides that the underwriters' obligations to
purchase shares of common stock depend on the satisfaction of the conditions
contained in the underwriting agreement and that, if any of the shares of common
stock are purchased by the underwriters under the underwriting agreement, all of
the shares of common stock that the underwriters have agreed to purchase under
the underwriting agreement, must be purchased. The conditions contained in the
underwriting agreement include the requirement that the representations and
warranties made by us to the underwriters are true, that there is no material
change in the financial markets and that we deliver to the underwriters
customary closing documents.

    The following table shows the underwriting fees to be paid to the
underwriters by us in connection with this offering. These amounts are shown
assuming both no exercise and full exercise of the underwriters' option to
purchase additional shares of common stock. This underwriting fee is the
difference between the public offering price and the amount the underwriters pay
to us to purchase the shares from us. On a per share basis, the underwriting fee
is 7% of the initial public offering price.

<TABLE>
<CAPTION>
                                                           NO          FULL
                                                        EXERCISE     EXERCISE
                                                       ----------   ----------
<S>                                                    <C>          <C>
Per share............................................  $     1.19   $     1.19
Total................................................  $4,760,000   $5,474,000
</TABLE>

    The representatives have advised us that the underwriters propose to offer
the shares of common stock directly to the public at the public offering price
set forth on the cover page of this prospectus, and to dealers, who may include
the underwriters, at this public offering price less a selling concession not in
excess of $.70 per share. The underwriters may allow, and the dealers may
reallow, a concession

                                       75
<PAGE>
not in excess of $.10 per share to brokers and dealers. After the offering, the
underwriters may change the offering price and other selling terms.

    We have granted to the underwriters an option to purchase up to an aggregate
of additional shares of common stock, exercisable solely to cover
over-allotments, if any, at the public offering price less the underwriting
discounts shown on the cover page of this prospectus. The underwriters may
exercise this option at any time until 30 days after the date of the
underwriting agreement. If this option is exercised, each underwriter will be
committed, so long as the conditions of the underwriting agreement are
satisfied, to purchase a number of additional shares of common stock
proportionate to the underwriter's initial commitment as indicated in the table
above and we will be obligated, under the over-allotment option, to sell the
shares of common stock to the underwriters.

    We have agreed that, without the prior consent of Lehman Brothers, we will
not, directly or indirectly, offer, sell or otherwise dispose of any shares of
common stock or any securities that may be converted into or exchanged for any
shares of common stock for a period of 180 days from the date of this
prospectus. All of our executive officers and directors and stockholders holding
all of the shares of our capital stock, including all of the holders of the
preferred stock and the warrants, have agreed under lock-up agreements that,
without the prior written consent of Lehman Brothers, they will not, directly or
indirectly, offer, sell or otherwise dispose of any shares of common stock or
any securities that may be converted into or exchanged for any shares of common
stock for the period ending 180 days after the date of this prospectus. See
"Shares Eligible for Future Sale."

    Prior to the offering, there has been no public market for the shares of
common stock. The initial public offering price has been negotiated between the
representatives and us. The material factors considered in determining the
initial public offering price of the common stock, in addition to prevailing
market conditions, were:

    - our historical performance and capital structure;

    - estimates of our business potential and earning prospects;

    - an overall assessment of our management; and

    - the above factors in relation to market valuations of companies in related
      businesses.

    Fidelity Capital Markets, a division of National Financial Services
Corporation, will be facilitating electronic distribution of information through
the Internet, intranet and other proprietary electronic technology.

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

    We have agreed to indemnify the underwriters against liabilities under the
Securities Act and liabilities arising from breaches of the representations and
warranties contained in the underwriting agreement, and to contribute to
payments that the underwriters may be required to make for these liabilities.

    Until the distribution of the common stock is completed, rules of the
Securities and Exchange Commission may limit the ability of the underwriters and
selling group members to bid for and purchase shares of common stock. As an
exception to these rules, the representatives are permitted to engage in
transactions that stabilize the price of the common stock. These transactions
may consist of bids or purchases for the purposes of pegging, fixing or
maintaining the price of the common stock.

    The underwriters may create a short position in the common stock in
connection with the offering, which means that they may sell more shares than
are set forth on the cover page of this prospectus. If the underwriters create a
short position, then the representatives may reduce that short position by

                                       76
<PAGE>
purchasing common stock in the open market. The representatives also may elect
to reduce any short position by exercising all or part of the over-allotment
option.

    The representatives also may impose a penalty bid on underwriters and
selling group members. This means that, if the representatives purchase shares
of common stock in the open market to reduce the underwriters' short position or
to stabilize the price of the common stock, they may reclaim the amount of the
selling concession from the underwriters and selling group members that sold
those shares as part of the offering.

    In general, purchases of a security for the purpose of stabilization or to
reduce a syndicate short position could cause the price of the security to be
higher than it might otherwise be in the absence of these purchases. The
imposition of a penalty bid might have an effect on the price of a security to
the extent that it were to discourage resales of the security by purchasers in
an offering.

    Neither we nor any of the underwriters makes any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above may have on the price of the common stock. In addition, neither
we nor any of the underwriters makes any representation that the representatives
will engage in these transactions or that these transactions, once commenced,
will not be discontinued without notice.

    Any offers in Canada will be made only under an exemption from the
requirements to file a prospectus in the relevant province of Canada in which
the sale is made.

    Purchasers of the shares of common stock offered in this prospectus may be
required to pay stamp taxes and other charges under the laws and practices of
the country of purchase, in addition to the offering price listed on the cover
page of this prospectus.

    The representatives have informed us that they do not intend to confirm the
sales of shares of common stock offered by this prospectus to any accounts over
which they exercise discretionary authority.

    At our request, the underwriters have reserved up to 400,000 shares or 10%
of the common stock offered by this prospectus for sale to our officers,
directors, employees, members of employees' families, customers, vendors,
suppliers and certain friends of our officers, directors and employees through a
directed share program at the initial public offering price set forth on the
cover page of this prospectus. These persons must commit to purchase no later
than the close of business on the day following the date of this prospectus. The
number of shares available for sale to the general public will be reduced to the
extent these persons purchase the reserved shares.

                                 LEGAL MATTERS

    The validity of the common stock offered hereby will be passed upon for us
by Gray Cary Ware & Freidenrich LLP, Palo Alto, California. Certain legal
matters relating to the offering will be passed upon for the underwriters by
O'Melveny & Myers LLP, Los Angeles, California. As of the date of this
prospectus, Gray Cary Ware & Freidenrich LLP and its partners beneficially own
an aggregate of 15,000 shares of our common stock.

                                    EXPERTS

    Ernst & Young LLP, independent auditors, have audited our financial
statements at December 31, 1997 and 1998 and September 30, 1999 and for the
period from July 2, 1997 (inception) through December 31, 1997, the year ended
December 31, 1998 and the nine months ended September 30, 1999, as set forth in
their report. We have included our financial statements in this prospectus and
elsewhere in the registration statement in reliance on Ernst & Young LLP's
reports, given on their authority as experts in accounting and auditing.

                                       77
<PAGE>
                      WHERE YOU CAN FIND MORE INFORMATION

    We have filed with the SEC a registration statement on Form S-1, including
the exhibits and schedules thereto, under the Securities Act with respect to the
shares to be sold in this offering. This prospectus does not contain all the
information set forth in the registration statement. For further information
about NetRatings and the shares to be sold in this offering, please refer to the
registration statement. Statements contained in this prospectus as to the
contents of any contract, agreement or other document referred to, are not
necessarily complete, and in each instance please refer to the copy of the
contract, agreement or other document filed as an exhibit to the registration
statement, each statement being qualified in all respects by this reference.

    You may read and copy all or any portion of the registration statement or
any reports, statements or other information NetRatings files with the SEC at
the SEC's public reference room at Room 1024, Judiciary Plaza, 450 Fifth
Street, N.C., Washington, D.C. 20549 and at the regional offices of the SEC
located at Seven World Trade Center, 13th Floor, New York, New York 10048 and
the Northwestern Atrium Center, 500 West Madison Street, Suite 1400, Chicago,
Illinois 60661. You can request copies of these documents upon payment of a
duplicating fee, by writing to the SEC. Please call the SEC at 1-800-SEC-0330
for further information on the operation of the public reference rooms.
NetRatings' SEC filings, including the registration statement, will also be
available to you on the SEC's Web site. The address of this site is
http://www.sec.gov.

                                       78
<PAGE>
                                NETRATINGS, INC.

                         INDEX TO FINANCIAL STATEMENTS

<TABLE>
<S>                                                           <C>
Report of Ernst & Young LLP, Independent Auditors...........  F-2

Balance Sheets..............................................  F-3

Statements of Operations....................................  F-4

Statements of Stockholders' Equity (Deficit)................  F-5

Statements of Cash Flows....................................  F-6

Notes to Financial Statements...............................  F-7
</TABLE>

                                      F-1
<PAGE>
               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

The Board of Directors and Stockholders
NetRatings, Inc.

    We have audited the accompanying balance sheets of NetRatings, Inc. as of
December 31, 1997 and 1998 and September 30, 1999, and the related statements of
operations, stockholders' equity (deficit), and cash flows for the period from
July 2, 1997 (inception) to December 31, 1997, for the year ended December 31,
1998 and for the nine months ended September 30, 1999. These financial
statements are the responsibility of NetRatings, Inc.'s management. Our
responsibility is to express an opinion on these financial statements based on
our audits.

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

    In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of NetRatings, Inc. at
December 31, 1997 and 1998 and September 30, 1999, and the results of its
operations and its cash flows for the period from July 2, 1997 (inception) to
December 31, 1997, for the year ended December 31, 1998 and for the nine months
ended September 30, 1999, in conformity with generally accepted accounting
principles.

                                                           /s/ Ernst & Young LLP

Palo Alto, California
October 12, 1999, except for paragraph 6 of Note 9, as to which the date is
November 4, 1999

                                      F-2
<PAGE>
                                NETRATINGS, INC.

                                 BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                                                          PRO FORMA
                                                                                                        STOCKHOLDERS'
                                                              DECEMBER 31,                                EQUITY AT
                                                        -------------------------     SEPTEMBER 30,     SEPTEMBER 30,
                                                           1997          1998             1999               1999
                                                        -----------   -----------   -----------------   --------------
                                                                                                         (UNAUDITED)
<S>                                                     <C>           <C>           <C>                 <C>
ASSETS
CURRENT ASSETS:
  Cash and cash equivalents...........................  $   551,000   $ 1,343,000     $ 28,650,000
  Accounts receivable, net............................           --       133,000        1,069,000
  Other current assets................................       35,000        16,000          294,000
                                                        -----------   -----------     ------------
    Total current assets..............................      586,000     1,492,000       30,013,000

Property and equipment net............................      367,000       394,000          593,000

Deferred financing costs..............................           --            --          369,000

Other assets..........................................       27,000        79,000          111,000
                                                        -----------   -----------     ------------
                                                        $   980,000   $ 1,965,000     $ 31,086,000
                                                        ===========   ===========     ============
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
CURRENT LIABILITIES:
  Accounts payable....................................  $    93,000   $   353,000     $    328,000
  Accrued liabilities.................................      415,000       210,000          973,000
  Deferred revenue....................................           --       280,000        2,010,000
  Capital lease obligations, current portion..........           --        77,000          162,000
  Notes payable.......................................           --            --          114,000
  Amounts due to Nielsen Media Research...............           --     2,539,000        2,164,000
  Convertible notes payable...........................           --       824,000               --
                                                        -----------   -----------     ------------
    Total current liabilities.........................      508,000     4,283,000        5,751,000

Capital lease obligations, long-term portion..........           --       130,000          204,000
Notes payable, long-term portion......................           --            --          116,000

Commitments and contingencies.........................
Redeemable convertible preferred stock:
  Authorized shares--15,571,000 shares
    Issued and outstanding shares--None in 1997 and
      1998 and 14,678,000 in 1999, and none pro forma
      (liquidation preference of $36,628,000 at
      September 30, 1999 and none at December 31, 1997
      and 1998).......................................           --            --       35,743,000                 --

STOCKHOLDERS' EQUITY (DEFICIT):
  Convertible preferred stock, $0.001 par value,
    Series A: Authorized shares: 1,900,000
    Issued and outstanding shares: 1,900,000 at
      December 31, 1998 and none at September 30, 1999
      and none pro forma (aggregate liquidation
      preference of $350,000 at December 31, 1998)....           --         2,000               --                 --
  Common stock, par value $0.001:
    Authorized shares: 86,851,000
    Issued and outstanding shares: 3,875,000 at
      December 31, 1997, 3,112,000 at December 31,
      1998, 3,892,000 at September 30, 1999 and
      10,519,000 pro forma............................        4,000         3,000            4,000       $     11,000
  Additional paid-in capital..........................    2,249,000     3,436,000       31,144,000         66,880,000
  Deferred compensation...............................           --      (229,000)      (3,196,000)        (3,196,000)
  Deferred service costs..............................           --            --      (22,225,000)       (22,225,000)
  Notes receivable from stockholder...................           --            --         (125,000)          (125,000)
  Accumulated deficit.................................   (1,781,000)   (5,660,000)     (16,330,000)       (16,330,000)
                                                        -----------   -----------     ------------       ------------
    Total stockholders' equity (deficit)..............      472,000    (2,448,000)     (10,728,000)      $ 25,015,000
                                                        -----------   -----------     ------------       ============
                                                        $   980,000   $ 1,965,000     $ 31,086,000
                                                        ===========   ===========     ============
</TABLE>

              See accompanying notes to the financial statements.

                                      F-3
<PAGE>
                                NETRATINGS, INC.

                            STATEMENTS OF OPERATIONS

<TABLE>
<CAPTION>
                                                    PERIOD FROM
                                                    JULY 2, 1997                       NINE MONTHS ENDED
                                                   (INCEPTION) TO    YEAR ENDED          SEPTEMBER 30,
                                                    DECEMBER 31,    DECEMBER 31,   --------------------------
                                                        1997            1998          1998           1999
                                                   --------------   ------------   -----------   ------------
                                                                                   (UNAUDITED)
<S>                                                <C>              <C>            <C>           <C>
Revenue..........................................    $        --    $   237,000    $   132,000   $  1,486,000

Cost of revenue..................................             --      1,061,000        362,000      4,269,000
                                                     -----------    -----------    -----------   ------------
Gross profit (loss)..............................             --       (824,000)      (230,000)    (2,783,000)
                                                     -----------    -----------    -----------   ------------
Operating expenses:
  Research and development.......................        994,000      1,185,000        821,000      1,806,000
  Sales and marketing............................        452,000      1,134,000        837,000      2,559,000
  General and administrative.....................        341,000        600,000        413,000      1,170,000
  Stock-based compensation.......................             --         25,000             --      2,327,000
                                                     -----------    -----------    -----------   ------------
    Total operating expenses.....................      1,787,000      2,944,000      2,071,000      7,862,000
                                                     -----------    -----------    -----------   ------------

Loss from operations.............................     (1,787,000)    (3,768,000)    (2,301,000)   (10,645,000)
Interest income (expense), net...................          6,000       (111,000)       (57,000)       (25,000)
                                                     -----------    -----------    -----------   ------------
Net loss.........................................    $(1,781,000)   $(3,879,000)   $(2,358,000)  $(10,670,000)
                                                     ===========    ===========    ===========   ============

Basic and diluted net loss per common share......    $     (2.03)   $     (2.78)   $     (1.79)  $      (5.19)
                                                     ===========    ===========    ===========   ============

Shares used to compute basic and diluted net loss
  per common share...............................        878,000      1,393,000      1,320,000      2,056,000
                                                     ===========    ===========    ===========   ============

Pro forma basic and diluted net loss per common
  share (unaudited)..............................                   $     (1.67)   $     (1.04)  $      (2.31)
                                                                    ===========    ===========   ============

Shares used to compute pro forma basic and
  diluted net loss per common share
  (unaudited)....................................                     2,319,000      2,270,000      4,626,000
                                                                    ===========    ===========   ============
</TABLE>

              See accompanying notes to the financial statements.

                                      F-4
<PAGE>
                                NETRATINGS, INC.
                  STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
<TABLE>
<CAPTION>
                                       CONVERTIBLE                                                            NOTE
                                     PREFERRED STOCK                COMMON STOCK            ADDITIONAL     RECEIVABLE
                                --------------------------   ---------------------------     PAID-IN          FROM
                                   SHARES        AMOUNT         SHARES         AMOUNT        CAPITAL      STOCKHOLDER
                                ------------   -----------   ------------   ------------   ------------   ------------
<S>                             <C>            <C>           <C>            <C>            <C>            <C>
Issuance of common stock to
  founders at $0.002 per share
  in July 1997 for
  cash........................            --   $        --      3,200,000   $      3,000   $      3,000             --
Issuance of common stock at
  $0.002 per share to
  employees and consultants
  for cash in 1997............            --            --        675,000          1,000          1,000             --
Contribution to capital.......            --            --             --             --      2,245,000             --
Net loss from July 2, 1997
  (inception).................            --            --             --             --             --             --
                                ------------   -----------   ------------   ------------   ------------   ------------
Balances at December 31,
  1997........................            --            --      3,875,000          4,000      2,249,000             --
Repurchase of common stock
  from founders and employees
  at $0.002 per share.........            --            --       (763,000)        (1,000)        (1,000)            --
Issuance of Series A
  convertible preferred stock
  at $0.18 per share in
  January 1998 for cash, net
  of issuance costs of
  $21,000.....................     1,900,000         2,000             --             --        327,000             --
Issuance of warrant in
  conjunction with issuance of
  convertible notes payable...            --            --             --             --        106,000             --
Contribution to capital.......            --            --             --             --        501,000             --
Deferred compensation related
  to grant of stock options...            --            --             --             --        254,000             --
Amortization of deferred
  compensation................            --            --             --             --             --             --
Net loss......................            --            --             --             --             --             --
                                ------------   -----------   ------------   ------------   ------------   ------------
Balances at December 31,
  1998........................     1,900,000         2,000      3,112,000          3,000      3,436,000             --
Exercise of common stock
  options and warrant.........            --            --        780,000          1,000        155,000       (125,000)
Compensation related to stock
  options granted to
  consultants.................            --            --             --             --        970,000             --
Issuance of warrant in
  conjunction with financing
  agreement...................            --            --             --             --        177,000             --
Issuance of warrant in
  connection with Series C
  redeemable convertible
  preferred stock.............            --            --             --             --        184,000             --
Deferred compensation related
  to grant of stock options...            --            --             --             --      3,949,000             --
Amortization of deferred
  compensation................            --            --             --             --
Deferred service costs........            --            --             --             --     22,600,000             --
Amortization of deferred
  service costs...............            --            --             --             --             --             --
Reclassification of Series A
  convertible preferred stock
  to redeemable convertible
  preferred stock due to
  addition of mandatory
  redemption features
  (Note 4)....................    (1,900,000)       (2,000)            --             --       (327,000)            --
Net loss......................            --            --             --             --             --
                                ------------   -----------   ------------   ------------   ------------   ------------
Balances at September 30,
  1999........................            --   $        --      3,892,000   $      4,000   $ 31,144,000   $   (125,000)
                                ============   ===========   ============   ============   ============   ============

<CAPTION>
                                                                                   TOTAL
                                                                               STOCKHOLDERS'
                                  DEFERRED        DEFERRED      ACCUMULATED       EQUITY
                                COMPENSATION    SERVICE COSTS     DEFICIT        (DEFICIT)
                                -------------   -------------   ------------   -------------
<S>                             <C>             <C>             <C>            <C>
Issuance of common stock to
  founders at $0.002 per share
  in July 1997 for
  cash........................  $         --               --   $        --    $      6,000
Issuance of common stock at
  $0.002 per share to
  employees and consultants
  for cash in 1997............            --               --            --           2,000
Contribution to capital.......            --               --            --       2,245,000
Net loss from July 2, 1997
  (inception).................            --               --    (1,781,000)     (1,781,000)
                                ------------    -------------   ------------   ------------
Balances at December 31,
  1997........................            --               --    (1,781,000)        472,000
Repurchase of common stock
  from founders and employees
  at $0.002 per share.........            --               --            --          (2,000)
Issuance of Series A
  convertible preferred stock
  at $0.18 per share in
  January 1998 for cash, net
  of issuance costs of
  $21,000.....................            --               --            --         329,000
Issuance of warrant in
  conjunction with issuance of
  convertible notes payable...            --               --            --         106,000
Contribution to capital.......            --               --            --         501,000
Deferred compensation related
  to grant of stock options...      (254,000)              --            --              --
Amortization of deferred
  compensation................        25,000               --            --          25,000
Net loss......................            --               --    (3,879,000)     (3,879,000)
                                ------------    -------------   ------------   ------------
Balances at December 31,
  1998........................      (229,000)              --    (5,660,000)     (2,448,000)
Exercise of common stock
  options and warrant.........            --               --            --          31,000
Compensation related to stock
  options granted to
  consultants.................            --               --            --         970,000
Issuance of warrant in
  conjunction with financing
  agreement...................            --               --            --         177,000
Issuance of warrant in
  connection with Series C
  redeemable convertible
  preferred stock.............            --               --            --         184,000
Deferred compensation related
  to grant of stock options...    (3,949,000)              --            --              --
Amortization of deferred
  compensation................       982,000               --            --         982,000
Deferred service costs........            --      (22,600,000)           --              --
Amortization of deferred
  service costs...............            --          375,000            --         375,000
Reclassification of Series A
  convertible preferred stock
  to redeemable convertible
  preferred stock due to
  addition of mandatory
  redemption features
  (Note 4)....................            --               --            --        (329,000)
Net loss......................            --               --   (10,670,000)   $(10,670,000)
                                ------------    -------------   ------------   ------------
Balances at September 30,
  1999........................  $ (3,196,000)   $ (22,225,000)  (16,330,000)   $(10,728,000)
                                ============    =============   ============   ============
</TABLE>

              See accompanying notes to the financial statements.

                                      F-5
<PAGE>
                                NETRATINGS, INC.

                            STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                               PERIOD FROM
                                                               JULY 2, 1997                       NINE MONTHS ENDED
                                                              (INCEPTION) TO    YEAR ENDED          SEPTEMBER 30,
                                                               DECEMBER 31,    DECEMBER 31,   --------------------------
                                                                   1997            1998          1998           1999
                                                              --------------   ------------   -----------   ------------
                                                                                              (UNAUDITED)
<S>                                                           <C>              <C>            <C>           <C>
OPERATING ACTIVITIES
  Net loss..................................................    $(1,781,000)   $(3,879,000)   $(2,358,000)  $(10,670,000)
  Adjustments to reconcile net loss to net cash used in
    operating activities:
    Depreciation and amortization...........................         24,000        200,000        158,000        277,000
    Provision for doubtful accounts.........................             --         25,000         10,000        220,000
    Stock-based compensation................................             --         25,000             --      2,327,000
    Amortization of discount associated with warrants issued
      on convertible notes payable..........................             --         35,000         22,000         26,000
    Amortization of deferred financing costs................             --             --             --         39,000
    Changes in operating assets and liabilities:
      Accounts receivable...................................             --       (158,000)       (72,000)    (1,156,000)
      Other current assets..................................        (35,000)        19,000         16,000       (278,000)
      Other assets..........................................        (27,000)       (85,000)       (78,000)       (57,000)
      Accounts payable......................................         93,000        260,000        111,000       (301,000)
      Accrued liabilities...................................        415,000       (205,000)      (281,000)       763,000
      Amounts due to Nielsen Media Research.................             --        539,000             --      1,625,000
      Deferred revenue......................................             --        280,000        211,000      1,730,000
                                                                -----------    -----------    -----------   ------------
Net cash used in operating activities.......................     (1,311,000)    (2,944,000)    (2,261,000)    (5,455,000)
                                                                -----------    -----------    -----------   ------------
INVESTING ACTIVITIES
  Acquisition of property and equipment.....................       (391,000)      (173,000)       (28,000)      (328,000)

FINANCING ACTIVITIES
  Proceeds from issuance of (repurchase of) common stock....          8,000         (2,000)        (2,000)        31,000
  Proceeds from issuance of convertible notes payable.......             --        895,000        875,000             --
  Proceeds from issuance of convertible notes payable to
    Nielsen Media Research..................................             --      2,000,000             --      1,000,000
  Proceeds from equipment financing and notes payable.......             --        221,000        242,000        410,000
  Principal payments on capital lease obligations...........             --        (35,000)       (25,000)       (99,000)
  Proceeds from issuance of preferred stock.................             --        329,000        329,000     31,748,000
  Contribution to capital...................................      2,245,000        501,000        501,000             --
                                                                -----------    -----------    -----------   ------------
Net cash provided by financing activities...................      2,253,000      3,909,000      1,920,000     33,090,000
                                                                -----------    -----------    -----------   ------------
  Net increase (decrease) in cash and cash equivalents......        551,000        792,000       (369,000)    27,307,000
Cash and cash equivalents at beginning of period............             --        551,000        551,000      1,343,000
                                                                -----------    -----------    -----------   ------------
Cash and cash equivalents at end of period..................    $   551,000    $ 1,343,000    $   182,000   $ 28,650,000
                                                                ===========    ===========    ===========   ============
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest......................................    $        --    $    85,000    $    58,000   $    131,000
                                                                ===========    ===========    ===========   ============
SUPPLEMENTAL DISCLOSURE OF NON-CASH TRANSACTIONS
  Property and equipment acquired
    under capital lease obligations.........................    $        --    $    21,000    $    21,000   $    123,000
                                                                ===========    ===========    ===========   ============
  Conversion of notes payable
    into redeemable convertible
    preferred stock.........................................    $        --    $        --    $        --   $  3,895,000
                                                                ===========    ===========    ===========   ============
  Issuance of common stock
    for note receivable.....................................    $        --    $        --    $        --   $    125,000
                                                                ===========    ===========    ===========   ============
</TABLE>

              See accompanying notes to the financial statements.

                                      F-6
<PAGE>
                                NETRATINGS, INC.

                         NOTES TO FINANCIAL STATEMENTS

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

NETRATINGS

    NetRatings, Inc. ("NetRatings") was incorporated in Delaware on July 2, 1997
and is engaged in the development and sale of Internet audience measurement
information and analysis services. Proprietary technology and data gathering
techniques enable NetRatings to offer its customers comprehensive, timely and
reliable information through an easy-to-use software interface. NetRatings
markets and sells its products and services under the Nielsen//NetRatings brand.

CASH AND CASH EQUIVALENTS

    Cash and cash equivalents, which consist of cash and highly liquid
short-term investments with insignificant interest-rate risk and original
maturities of three months or less at date of purchase, are carried at cost,
which approximates fair value. Interest income was $6,000, $18,000, $10,000 and
$132,000 for the period July 2, 1997 (inception) to December 31, 1997, the year
ended December 31, 1998, and the nine months ended September 30, 1998 and 1999.

PROPERTY AND EQUIPMENT

    Property and equipment are stated at cost, net of accumulated depreciation
and amortization. Property and equipment are depreciated on a straight-line
basis over the estimated useful lives of the assets, generally three to five
years.

PURCHASED TECHNOLOGY

    Purchased technology consists of the costs of purchased product technology
which are amortized using the straight-line method over periods not exceeding
three years. Purchased technology is included in other assets in the
accompanying balance sheets. Management evaluates the future realization of
purchased technology quarterly and writes down any amounts that management deems
unlikely to be recovered through future product sales. No write downs have been
recorded through September 30, 1999.

STOCK-BASED COMPENSATION

    NetRatings accounts for stock-based awards to employees under the intrinsic
value method in accordance with Accounting Principles Board Opinion No. 25,
"Accounting for Stock Issued to Employees" ("APB 25") and has adopted the
disclosure-only alternative of Statement of Financial Accounting Standards
No. 123, "Accounting for Stock-Based Compensation" ("FAS 123").

REVENUE RECOGNITION

    Revenue for recurring services are recognized ratably over the term of the
related contract as services are provided. Revenue for nonrecurring services is
recognized in the period in which the product is delivered. Billings rendered in
advance of services being performed are recorded as deferred revenue in the
accompanying balance sheet.

    Barter transactions are recorded at the lower of estimated fair value of
services provided or the estimated fair value of goods and services received.
Revenue from barter transactions is recognized

                                      F-7
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

ratably over the period for which services are performed. Barter expenses are
expensed as incurred. Barter revenue and expenses were $0 for the period from
July 2, 1997 (inception) to December 31, 1997 and $38,000 and $55,000 for the
year ended December 31, 1998. Barter revenue and expenses were $22,000 and
$55,000 and $61,000 and $90,000 for the nine month periods ended September 30,
1998 and 1999.

PANEL COSTS

    Costs of establishing and maintaining a panel (a statistically selected
group of Internet users) are expensed as incurred and are included in cost of
revenue.

ADVERTISING EXPENSE

    All advertising costs are expensed as incurred. Advertising costs, which are
included in sales and marketing expense, were $0 for the period from July 2,
1997 (inception) to December 31, 1997 and $36,000 for the year ended
December 31, 1998 and $24,000 and $424,000 for the nine months ended
September 30, 1998 and 1999.

INCOME TAXES

    NetRatings accounts for income taxes in accordance with Statement of
Financial Accounting Standards No. 109, "Accounting for Income Taxes"
("FAS 109"), which requires the use of the liability method in accounting for
income taxes. Under FAS 109, deferred tax assets and liabilities are measured
based on differences between the financial reporting and tax bases of assets and
liabilities using enacted tax rates and laws that will be in effect when the
differences are expected to reverse.

IMPAIRMENT OF LONG-LIVED ASSETS

    NetRatings evaluates its long-lived assets for impairment whenever events or
changes in circumstances indicate that the carrying amount 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 expected
to be generated by the asset. If such 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. Assets to be disposed
of are reported at the lower of the carrying amount or fair value less costs to
sell.

FINANCIAL INSTRUMENTS AND CONCENTRATION OF CREDIT RISK

    The carrying value of NetRatings' financial instruments, including cash and
cash equivalents, accounts receivable and notes payable approximates fair value.
Cash and cash equivalents and accounts receivable approximate fair market value
due to their short term nature. Notes payable approximate fair value as interest
rates on these notes approximate market rates.

    Financial instruments which subject NetRatings to concentrations of credit
risk consist primarily of cash and cash equivalents and trade accounts
receivable. NetRatings maintains its cash in a domestic financial institution
with a high credit standing and performs periodic evaluations of the relative
credit

                                      F-8
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

standing of this institution. NetRatings conducts business with companies in
various industries throughout the United States and performs ongoing credit
evaluations of its customers. Reserves are maintained for potential credit
losses. At December 31, 1998 and September 30, 1999, the allowance for doubtful
accounts totalled $25,000 and $245,000, respectively.

COMPREHENSIVE INCOME

    Effective January 1, 1998, NetRatings adopted Statement of Financial
Accounting Standards No. 130, "Reporting Comprehensive Income" ("FAS 130").
FAS 130 establishes new rules for the reporting and display of comprehensive
income and its components in a full set of general purpose financial statements.
There is no difference in NetRatings historic net losses as reported and the
comprehensive net losses under the provision of FAS 130 for any periods
presented.

COMPUTATION OF NET LOSS PER COMMON SHARE

    NetRatings computes net loss per share based on Financial Accounting
Standards Board Statement No. 128, "Earnings Per Share" ("FAS 128"). In
accordance with FAS 128, basic net loss per share is calculated as net loss
divided by the weighted-average number of common shares outstanding less shares
subject to repurchase. Diluted net loss per share is computed using the
weighted-average number of common shares outstanding and dilutive common stock
equivalents outstanding during the period. Common equivalent shares from stock
options and warrants (using the treasury stock method) and convertible preferred
stock and notes payable have been excluded from the calculation of net loss per
share as their effect is antidilutive.

    Pro forma net loss per share has been computed as described above and also
gives effect, under Securities and Exchange Commission guidance, to the
conversion of preferred shares not included above that will automatically
convert to common shares upon completion of the NetRatings' initial public
offering, using the if-converted method (Note 6).

INTERIM FINANCIAL INFORMATION

    The interim financial information at September 30, 1998 and for the nine
month period ended September 30, 1998 is unaudited but, in the opinion of
management, includes all adjustments, consisting only of normal recurring
adjustments, which NetRatings considers necessary for a fair presentation of the
financial position and results of operations for the interim periods. The
results of operations for the nine months ended September 30, 1999 are not
necessarily indicative of the results to be expected for the full fiscal year.

USE OF ESTIMATES

    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements. Actual
results could differ from these estimates.

                                      F-9
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 1:  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

RECENT PRONOUNCEMENTS

    As of January 1998, the Company adopted FASB Statement No. 131, DISCLOSURES
ABOUT SEGMENTS OF AN ENTERPRISE AND RELATED INFORMATION ("FAS 131"). FAS 131
establishes standards for the way that public business enterprises report
information about operating segments in annual financial statements and requires
that those enterprises report selected information about operating segments in
interim financial reports. FAS 131 also establishes standards for related
disclosures about products and services, geographic areas, and major customers.
The adoption of FAS 131 did not affect results of operations, financial position
or disclosure of segment information. NetRatings conducts business in one
operating segment. NetRatings is engaged in the development and sale of Internet
audience measurement information and analytical services. NetRatings' management
has determined the operating segment based upon how the business is managed and
operated.

    In June 1998, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 133, "Accounting for Derivative Instruments
and Hedging Activities" ("FAS 133"). FAS 133 requires that all derivative
instruments be recorded on the balance sheet at their fair value. Changes in the
fair value of derivatives are recorded each period in current earnings or other
comprehensive income, depending on whether a derivative is designed as part of a
hedge transaction, and, if so, the type of hedge transaction. In June 1999, the
FASB issued FAS 137, "Accounting for Derivative Instruments and Hedging
Activities--Deferral of the Effective Date of FASB Statement No. 133"
("FAS 137"), which amends FAS 133 to be effective for all fiscal quarters or all
fiscal years beginning after June 15, 2000 or January 1, 2001 for NetRatings.
Management does not currently expect that adoption of FAS 137 will have a
material impact on NetRatings' financial position or results of operations.

NOTE 2:  BALANCE SHEET DETAILS

    Details of balance sheet items are as follows:

<TABLE>
<CAPTION>
                                                DECEMBER 31,
                                            ---------------------   SEPTEMBER 30,
                                              1997        1998           1999
                                            --------   ----------   --------------
<S>                                         <C>        <C>          <C>
Computer equipment and software...........  $360,000   $  547,000     $  957,000
Office equipment, furniture, and
  fixtures................................    17,000       19,000         40,000
Leasehold improvements....................    14,000       19,000         39,000
                                            --------   ----------     ----------
                                             391,000      585,000      1,036,000
Less accumulated depreciation and
  amortization............................   (24,000)    (191,000)      (443,000)
                                            --------   ----------     ----------
Property and equipment, net...............  $367,000   $  394,000     $  593,000
                                            ========   ==========     ==========
</TABLE>

                                      F-10
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 2:  BALANCE SHEET DETAILS (CONTINUED)

    As of December 31, 1998 and September 30, 1999, property and equipment
includes amounts held under capital leases of $242,000 and $356,000
respectively, and related accumulated amortization of $74,000 and $163,000,
respectively.

<TABLE>
<CAPTION>
                                                 DECEMBER 31,
                                             ---------------------   SEPTEMBER 30,
                                               1997        1998           1999
                                             --------   ----------   --------------
<S>                                          <C>        <C>          <C>
Purchased technology, net..................  $    --    $   66,000     $   42,000
Other non-current assets...................   27,000        13,000         69,000
                                             -------    ----------     ----------
    Other assets...........................  $27,000    $   79,000     $  111,000
                                             =======    ==========     ==========
</TABLE>

    Amortization of purchased technology for the year ended December 31, 1998
was $33,000 and for the nine months ended September 30, 1999 was $25,000.

<TABLE>
<CAPTION>
                                                DECEMBER 31,
                                            ---------------------   SEPTEMBER 30,
                                              1997        1998           1999
                                            --------   ----------   --------------
<S>                                         <C>        <C>          <C>
Accrued compensation......................  $ 31,000   $   88,000     $  141,000
Accrued legal fees........................     2,000       10,000        340,000
Other accrued liabilities.................   382,000      112,000        492,000
                                            --------   ----------     ----------
    Accrued liabilities...................  $415,000   $  210,000     $  973,000
                                            ========   ==========     ==========
</TABLE>

<TABLE>
<CAPTION>
                                                DECEMBER 31,
                                            ---------------------   SEPTEMBER 30,
                                              1997        1998           1999
                                            --------   ----------   --------------
<S>                                         <C>        <C>          <C>
Accrued amounts payable to Nielsen Media
  Research................................  $     --   $  539,000     $2,164,000
Convertible notes payable--Nielsen Media
  Research................................        --    2,000,000             --
                                            --------   ----------     ----------
Amounts due to Nielson Media Research.....  $     --   $2,539,000     $2,164,000
                                            ========   ==========     ==========
</TABLE>

NOTE 3:  NOTES PAYABLE

    In January 1998, NetRatings entered into a $500,000 equipment loan under a
master equipment financing agreement of which $242,000 and $500,000 had been
utilized as of December 31, 1998 and September 30, 1999 respectively. The
equipment financing bears interest at an annual rate of 8% and is secured by the
assets purchased with the borrowings. Borrowings and interest are due in
installments over 42 months. The drawdowns under this equipment financing
agreement have been classified as capital leases.

    In connection with the equipment financing, NetRatings issued warrants to
purchase 48,000 shares of common stock at an exercise price $0.42 per share. The
warrant has a contractual term of nine years. The value of these warrants at the
date of issuance was not material and no value was attributed to them in the
accompanying financial statements. None of these warrants had been exercised as
of September 30, 1999.

                                      F-11
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 3:  NOTES PAYABLE (CONTINUED)

    In March 1999, NetRatings borrowed an additional $258,000 to fully utilize
the above facility. As of September 30, 1999, there was $366,000 due under the
agreement. In conjunction with these additional borrowings, NetRatings issued
warrants to purchase 9,000 shares of common stock at an exercise price of $2.12
per share. The warrants have a contractual term of seven years. At the date of
grant, the fair value ascribed to the warrants was approximately $45,000, based
on a Black-Scholes valuation model, was recorded as a discount to the capital
leases and is being amortized as additional interest expense over the term of
capital leases.

    In March 1999, NetRatings entered into a $244,000 payment plan agreement
with a vendor. Approximately $156,000 of the total amount under this agreement
bears interest at an annual effective rate of 8.62%. The payment plan amounts
including the interest-free portion and the interest are repayable in twelve
quarterly installments of $22,000 each. Future maturities under this payment
plan for years ending December 31 are as follows:

<TABLE>
<S>                                                           <C>
1999........................................................  $ 26,000
2000........................................................    88,000
2001........................................................    88,000
2002........................................................    28,000
                                                              --------
                                                              $230,000
                                                              ========
</TABLE>

NOTE 4:  REDEEMABLE CONVERTIBLE PREFERRED STOCK

<TABLE>
<CAPTION>
                                                                                                LIQUIDATION
                                            DESIGNATED SHARES   ISSUED AND OUTSTANDING SHARES   PREFERENCE
                                            -----------------   -----------------------------   -----------
<S>                                         <C>                 <C>                             <C>
Series A redeemable
  convertible preferred stock
  ("Series A")............................      1,900,000                 1,900,000                $0.18
Series B redeemable
  convertible preferred stock
  ("Series B")............................      2,184,000                 1,477,000                $0.63
Series C redeemable
  convertible preferred stock
  ("Series C")............................      6,600,000                 6,414,000                $3.11
Series D redeemable
  convertible preferred stock
  ("Series D")............................      4,887,000                 4,887,000                $3.14
                                               ----------                ----------
Total.....................................     15,571,000                14,678,000
                                               ==========                ==========
</TABLE>

SERIES A

    In January 1998, NetRatings issued 1,900,000 shares of Series A at a price
of $0.18 per share for cash for a total purchase price of $350,000. Series A
shares were originally not redeemable and were convertible into shares of common
stock using conversion ratio of one share of common stock for two

                                      F-12
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 4:  REDEEMABLE CONVERTIBLE PREFERRED STOCK (CONTINUED)

shares of Series A preferred stock, subject to certain adjustments for dilution,
if any, resulting from future stock issuances and accordingly were included in
stockholders' equity as of December 31, 1998. Upon issuance of Series C shares
the Series A conversion ratio was changed to one share of common stock for eight
shares of Series A preferred stock and in addition holders of Series A were
granted the redemption features described below.

SERIES B

    In July 1999, the holders of $895,000 in convertible notes payable converted
their promissory notes to 1,477,000 shares of Series B at approximately $0.63
per share. The 1,477,000 shares of Series B represented the $895,000 in
principal from the convertible notes payable, plus approximately $40,000 in
interest accrued through November 1998. The remaining $55,000 in accrued
interest due to the holders of the convertible notes payable at the time of
conversion was paid by NetRatings. Each share of Series B is convertible into
shares of common stock at the option of the holder using the conversion ratio of
one share of common stock for two shares of Series B preferred stock and has the
redemption features described below.

SERIES C

    In August 1999, NetRatings issued 6,414,000 shares of Series C at a price of
$3.11 per share for a total purchase price of $20,000,000. Nielsen Media
Research converted $3.0 million in notes payable into Series C shares and
NetRatings received cash proceeds from the sale of Series C shares of
$17 million. Issuance costs related to Series C are $620,000 including the value
of warrants granted to a financial advisor to purchase 43,000 shares at $6.24
per share. The value of the fully vested warrants issued to the financial
advisor using the Black-Scholes valuation model is $184,000. These warrants are
fully vested and expire in 2005. Each share of Series C is convertible into
shares of common stock at the option of the holder using the conversion ratio of
one share of common stock for two shares of preferred stock and has the
redemption features described below.

    In August 1999, simultaneously with the Series C offering, the Company
entered into additional agreements with Nielsen Media Research superceding the
term sheet that had previously governed the Company's strategic relationship
with Nielsen Media Research. In connection with this transaction, NetRatings
also issued two warrants to Nielsen Media Research, one of the Series C
investors, to purchase shares of common stock. The other Series C investor did
not receive warrants. The first warrant entitles Nielsen Media Research to
purchase 553,000 shares of common stock at the per share exercise price of
$7.20. The second warrant entitles Nielsen Media Research to purchase 6,000,000
shares of common stock at the exercise price of $12.00 per share or 60% of
NetRatings' per share price at its initial public offering, whichever is lower.
The first warrant which expires on December 31, 2001 becomes exercisable at the
earlier of January 1, 2000 or the effective date of NetRatings' initial public
offering. The second warrant which expires on December 31, 2004 becomes
exercisable at the earlier of January 1, 2002 or the effective date of
NetRatings' initial public offering. NetRatings recorded a deferred charge in
August 1999 totaling $22,600,000 representing the value of these warrants based
on a Black-Scholes valuation model. The value of these warrants is subject to
change based upon the Company's initial public offering price. The deferred
charge is being amortized to operating expense, through December 31, 2004, the
final expiration date of the second warrant. Amortization expense is

                                      F-13
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 4:  REDEEMABLE CONVERTIBLE PREFERRED STOCK (CONTINUED)

$375,000 for the nine months ended September 30, 1999 and is included in
stock-based compensation in the accompanying statement of operations.

    In connection with the Series C financing transaction, NetRatings also
granted Nielsen Media Research the right to purchase additional shares of
NetRatings' common stock in connection with NetRatings' initial public offering,
at the initial public offering price. Nielsen will have the right to purchase a
sufficient number of shares of NetRatings common stock to enable Nielsen to own
52% of NetRatings' outstanding fully diluted shares immediately following
NetRatings initial public offering. If Nielsen Media Research elects to purchase
all or a portion of the stock it is entitled to purchase, each existing
preferred and common stockholder will be entitled to offer its shares to Nielsen
at the initial public offering price subject to certain limitations that are to
be agreed to by NetRatings and the underwriters.

    NetRatings also entered into a stockholders agreement with Nielsen that
grants Nielsen the right to nominate a single director to NetRatings' board,
which increases to two directors in the event that Nielsen exercises both of the
warrants described above. The stockholders agreement also provides that, for a
period of five years after the date of the agreement, NetRatings will not sell
or solicit proposals for the sale of NetRatings to a third party. After this
five-year period, NetRatings may sell their business subject to Nielsen's right
of first refusal. This right of first refusal terminates on the effective date
of a NetRatings' initial public offering.

SERIES D

    In September 1999, NetRatings issued 4,887,000 shares of Series D to
ACNielsen and Series C stockholders at a price of $3.14 per share for cash for a
purchase price of $15,238,000 (net of issuance costs of $105,000). Each share of
Series D is convertible into shares of common stock at the option of the holder
and using the conversion ratio of one share of common stock for two shares of
preferred stock and has the redemption features described below.

CONVERSION

    Each share of Series A, B, C and D redeemable convertible preferred stock
is, at the option of the holder, convertible into shares of common stock using
the applicable conversion ratio. The outstanding shares of redeemable
convertible preferred stock automatically convert into common stock immediately
prior to the closing of an underwritten public offering of common stock under
the Securities Act of 1933 in which NetRatings receives at least $15,000,000 in
gross proceeds and the price per share is at least $4.00 per share in case of
Series A and Series B and at least $8.00 per share for Series C and Series D.

DIVIDENDS

    Holders of Series A, B, C and D redeemable convertible preferred stock are
entitled to receive noncumulative dividends of $0.06, $0.06, $0.21 and $0.19 per
share respectively. Dividends are to be paid when declared by the board of
directors out of legally available funds. No dividends have been declared or
paid.

                                      F-14
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 4:  REDEEMABLE CONVERTIBLE PREFERRED STOCK (CONTINUED)

VOTING RIGHTS

    Series A, B, C and D stockholders are entitled to the number of votes equal
to the number of shares of common stock into which such shares of the respective
series could be converted and have the voting rights and powers of the common
stock, voting together as a single class. In addition, the Series D stockholders
also have special rights under which so long as at least 1,000,000 shares of
Series D remain outstanding, NetRatings could not authorize, issue or obligate
itself to issue any other equity security on parity with the Series D as to the
dividend, redemption right, liquidation preference, conversion rights and voting
rights senior to or on a parity with the Series D. Also NetRatings is not able
to affect a merger or consolidation with any other entity where the stockholders
of NetRatings would hold less than 50% of the surviving entity and the per share
consideration to be received by the Series D stockholders would be less than
$5.16.

REDEMPTION

    At any time after the respective fifth anniversary of the original issuance
of the Series D, upon the affirmative vote or written consent of the holders of
at least two-thirds of the outstanding shares of Series A, B, C or D, NetRatings
shall redeem all issued, outstanding, and unconverted shares at the respective
redemption price. The redemption price for each share of Series A, B, C and D
shall be $0.18, $0.63, $3.11 and $3.14 respectively and any declared but unpaid
dividends.

LIQUIDATION PREFERENCE

    Series A, B, C and D stockholders are entitled to receive, upon liquidation,
an amount equal to the sum of their respective liquidation preference and all
declared but unpaid dividends. Thereafter the remaining assets and funds, if any
shall be distributed pro rata among the preferred and common shareholders until
the Series A, B, C and D stockholders have received $0.36, $1.26, $9.35 and
$9.42, respectively. Thereafter, any remaining funds shall be distributed pro
rata among the common shareholders. In the event that the assets and funds to be
distributed among the holders of Series A, B, C and D are insufficient to permit
payment of the full preferential amount, then the entire assets and funds shall
be distributed ratably among such holders in proportion to the preferential
amount each such holder is otherwise entitled to receive.

NOTE 5:  STOCKHOLDERS' EQUITY (DEFICIT)

CONVERTIBLE NOTES PAYABLE

    In May and November 1998, NetRatings issued convertible notes payable for
total cash proceeds of $895,000. The notes were convertible in shares of
Series B stock at approximately $0.63 per share. The notes had an original
maturity date of May 2000 and bear interest at 9% per annum. The notes and a
portion of accrued but unpaid interest were converted into shares of Series B
redeemable convertible preferred stock in July 1999 (Note 4). In conjunction
with this debt issuance, NetRatings issued to the holders of the notes warrants
to purchase 707,000 shares of NetRatings' Series B convertible preferred stock
at an exercise price of $0.63 per share. The warrants have a contractual term of
five years. At the date of grant, the value ascribed to the warrants was
approximately $106,000, based on a Black-Scholes valuation model. This amount
was recorded as discount to the convertible notes payable and up until the time
of conversion was being amortized as additional interest expense

                                      F-15
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 5:  STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)

over the term of the convertible notes payable. Accordingly, NetRatings recorded
additional interest expense of $35,000 in the year ended December 31, 1998 and
$26,000 in the nine months ended September 30, 1999. The effective interest rate
on the convertible notes, as adjusted for the ascribed value of the convertible
note warrants, was approximately 14.9% per annum. None of the above warrants had
been exercised as of September 30, 1999.

    NetRatings entered into a strategic alliance with Nielsen Media Research in
October 1998 to develop and market Internet audience measurement products and
services in the United States and Canada using NetRatings technology and Nielsen
Media Research's proprietary panel selection methodology. Also, in
October 1998, NetRatings issued a convertible note payable to Nielsen Media
Research for cash proceeds of $2,000,000. The note had an original maturity date
of December 31, 1999 and bears interest at 6%, to be paid semiannually in
arrears.

    In April 1999, NetRatings issued another convertible note payable to Nielsen
Media Research for cash proceeds of $1,000,000. This note was interest free and
was also payable on December 31, 1999. Both the notes were convertible into
shares of NetRatings' next issuance of preferred stock at the per share price of
that financing. Nielsen Media Research converted both the notes into shares of
Series C convertible redeemable preferred stock at a price of $3.11 per share.
(Note 4).

COMMON STOCK WARRANTS

    In connection with the sale of Series A preferred stock, NetRatings issued
warrants for the purchase of 225,000 shares of common stock at an exercise price
of $0.02 per share. The warrants became exercisable upon the issuance of the
Series B preferred stock in July 1999. The value of these warrants at the date
of issuance was not material and no value was attributed to them in the
accompanying financial statements. These warrants were exercised in September
1999.

COMMON STOCK

    In September 1997, under a stock purchase agreement, NetRatings issued
3,200,000 shares of common stock to founders at a price of $0.002 per share. In
May 1998, the terms of this agreement were amended and NetRatings repurchased
590,000 common shares at cost. Following the amendment, all of the remaining
outstanding shares are subject to repurchase rights which expire ratably over
the 48 months following September 1, 1996. At September 30, 1999, 653,000 shares
were subject to repurchase.

    NetRatings has issued 675,000 shares of common stock to employees and
consultants under stock purchase agreements. These shares are subject to
repurchase rights which expire ratably over 48 months. Upon termination of
service, any unvested shares may be repurchased by NetRatings at the issuance
price. Shares subject to repurchase totaled 596,000 at December 31, 1997,
269,000 at December 31, 1998 and 229,000 at September 30, 1999. In July 1998,
NetRatings repurchased at cost 173,000 shares of common stock from employees
upon their termination.

                                      F-16
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 5:  STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)

NOTE RECEIVABLE FROM STOCKHOLDER

    In August, 1999, NetRatings issued $125,000 in promissory notes to a member
of the Board of Directors of NetRatings in connection with the exercise of stock
options. The notes bear interest at 5% per annum, are due in three years and
NetRatings has full recourse against the holder.

CONTRIBUTION TO CAPITAL

    Contributions to capital represent funds received in connection with the
formation and development of NetRatings. These funds were utilized to perform
market research, write the business plan, and commence product development.

PROPOSED PUBLIC OFFERING OF COMMON STOCK

    On September 21, 1999, the Board of Directors authorized NetRatings to
proceed with an initial public offering of its common stock. If the offering is
consummated as presently anticipated, all of the outstanding redeemable
convertible preferred stock will automatically convert to common stock. The
unaudited pro forma stockholders' equity at September 30, 1999 gives effect to
the conversion of all outstanding shares of redeemable convertible preferred
stock at that date into 6,626,000 shares of common stock upon the completion of
the offering. The unaudited pro forma stockholders' equity at September 30, 1999
does not give effect to the exercise by Nielsen Media Research of warrants to
purchase 6,553,000 shares of common stock or the exercise of its rights to
purchase additional shares of common stock to enable Nielsen Media Research to
own 52% of NetRatings' outstanding fully diluted shares immediately following
NetRatings' initial public offering, as described in Note 4. In addition, the
unaudited pro forma stockholders' equity at September 30, 1999 does not give
effect to the exercise of warrants to purchase up to 707,000 shares of
NetRatings' Series B convertible preferred stock, as described in Note 5 under
the subheading CONVERTIBLE NOTES PAYABLE.

STOCK SPLIT

    On September 21, 1999, the Board of Directors approved a one-for-two reverse
stock split of issued and outstanding common stock to be effective prior to the
completion of the initial public offering of its common stock. The accompanying
financial statements have been retroactively restated to give effect to the
reverse stock split.

1998 STOCK PLAN

    In April 1998, NetRatings adopted the 1998 Stock Plan (the "Plan"). Under
the Plan, up to 1,215,000 shares of NetRatings' common stock was reserved for
issuance under the terms of the Plan. Through September 30, 1999, an additional
1,750,000 shares were reserved for issuance under the Plan. Options may be
granted at no less than 85% of the fair value on the date of the grant (110% of
fair value in certain instances), as determined by the board of directors.
Options generally vest over a four-year period and have a maximum term of ten
years.

                                      F-17
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 5:  STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)

    Information with respect to stock option activity is summarized as follows:

<TABLE>
<CAPTION>
                                                      OPTIONS OUTSTANDING
                                       OPTIONS      ------------------------     WEIGHTED-
                                    AVAILABLE FOR   NUMBER OF     PRICE PER       AVERAGE
                                        GRANT         SHARES        SHARE      EXERCISE PRICE
                                    -------------   ----------   -----------   --------------
<S>                                 <C>             <C>          <C>           <C>
Authorized........................    1,215,000             --       --                --
Granted...........................     (868,000)       868,000      $0.10           $0.10
                                     ----------     ----------   -----------
  Balance at December 31, 1998....      347,000        868,000      $0.10           $0.10
Authorized........................    1,750,000             --       --                --
Granted...........................   (1,456,000)     1,456,000   $0.10-$8.40        $2.45
Exercised.........................           --       (555,000)  $0.10-$0.50        $0.27
Canceled..........................       47,000        (47,000)     $0.10           $0.10
                                     ----------     ----------   -----------
  Balance at September 30, 1999...      688,000      1,722,000   $0.10-$8.40        $2.04
                                     ==========     ==========   ===========
</TABLE>

    The weighted-average remaining contractual life of all outstanding options
is 8.96 years. The weighted-average fair value of options granted was $0.02 and
$5.84 during the year ended December 31, 1998 and the nine months ended
September 30, 1999, respectively.

    The following table summarizes information concerning options outstanding
and exercisable at September 30, 1999.

<TABLE>
<CAPTION>
                                           OPTIONS OUTSTANDING                     OPTIONS EXERCISABLE
                             -----------------------------------------------   ----------------------------
                                                            WEIGHTED-AVERAGE
                             NUMBER OF   WEIGHTED-AVERAGE      REMAINING       NUMBER OF   WEIGHTED-AVERAGE
EXERCISE PRICE                SHARES      EXERCISE PRICE    CONTRACTUAL LIFE    SHARES      EXERCISE PRICE
- --------------               ---------   ----------------   ----------------   ---------   ----------------
<S>                          <C>         <C>                <C>                <C>         <C>
$0.10......................    580,000        $0.10               8.42          295,000         $0.10
$0.50......................    629,000        $0.50               9.51          104,000         $0.50
$5.30......................    271,000        $5.30               9.27           31,000         $5.30
$6.22......................     33,000        $6.22               9.81               --            --
$6.28......................     36,000        $6.28              10.00               --            --
$7.20......................    150,000        $7.20              10.00               --            --
$8.40......................     23,000        $8.40              10.00               --            --
                             ---------                                          -------
                             1,722,000                                          430,000
                             =========                                          =======
</TABLE>

                                      F-18
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 5:  STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)

SHARES RESERVED FOR FUTURE ISSUANCE

    NetRatings has reserved shares of common stock for future issuance as
follows:

<TABLE>
<CAPTION>
                                                      DECEMBER 31,    SEPTEMBER 30,
                                                          1998             1999
                                                      -------------   --------------
<S>                                                   <C>             <C>
Redeemable convertible preferred stock, including
  effect of preferred stock warrants................    1,303,000        6,980,000
Stock options outstanding...........................      868,000        1,722,000
Stock options, available for grant..................      347,000          688,000
Warrants to purchase common stock...................      273,000        6,680,000
</TABLE>

DEFERRED COMPENSATION

    NetRatings has recorded deferred stock compensation charges of $0, $254,000,
$69,000, and $3,949,000 during the period from July 2, 1997 (inception) to
December 31, 1997, for the year ended December 31, 1998 and for the nine months
ended September 30, 1998 and 1999, respectively, representing the difference
between the exercise price of the option and the fair value of common stock as
of the date of grant. These amounts are being amortized by charges to
operations, using the graded method, over the vesting periods of the individual
stock options, which are four years.

OPTIONS ISSUED TO CONSULTANTS

    On June 1, 1999 and August 19, 1999, NetRatings granted options to purchase
135,000 and 100,000 shares of common stock to consultants at an exercise price
of $0.50 and $5.30 per share respectively. These options were granted in
exchange for consulting services performed and were fully vested upon grant.
NetRatings valued these options at their fair value and recorded a charge to
operations of $970,000 for the nine months ended September 30, 1999.

PRO FORMA DISCLOSURES OF THE EFFECT OF STOCK-BASED COMPENSATION

    NetRatings has elected to follow APB 25 and related interpretations in
accounting for its employee stock options. The alternative fair value accounting
provided for under Financial Accounting Standards Board Statement No. 123,
"Accounting for Stock-Based Compensation" ("FAS 123"), requires use of option
valuation models that were not developed for use in valuing employee stock
options. Under APB 25, when the exercise price of NetRatings' employee stock
options equals the market price of the underlying stock on the date of grant, no
compensation expense is recognized.

    Pro forma information regarding net income (loss) is required by FAS 123,
which also requires that the information be determined as if NetRatings has
accounted for its employee stock options under the fair value method of
FAS 123. The fair value of these options was estimated at the date of grant
using a Black-Scholes option pricing valuation model with the following
weighted-average assumptions: volatility of 0.80; risk-free interest rates of
4.57% to 5.92% for the year ended December 31, 1998 and the nine months ended
September 30, 1999; a dividend yield of 0%; and a weighted-average expected life
of the option of four years.

                                      F-19
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 5:  STOCKHOLDERS' EQUITY (DEFICIT) (CONTINUED)

    The option valuation models were developed for use in estimating the fair
value of traded options that have no vesting restrictions and are fully
transferable. In addition, option valuation models require the input of highly
subjective assumptions, including the expected life of the option. Because
NetRatings' employee stock options have characteristics significantly different
from those of traded options and because changes in the subjective input
assumptions can materially affect the fair value estimate, in management's
opinion, the existing models do not necessarily provide a reliable single
measure of the fair value of its employee stock options.

    Had compensation cost for NetRatings' stock-based compensation plans been
determined using the fair value at the grant dates for awards under those plans
calculated using the minimum value method of FAS 123, NetRatings' historical net
loss applicable to common stockholders and basic and diluted net loss per share
would have been increased to the pro forma amounts indicated below:

<TABLE>
<CAPTION>
                                 PERIOD FROM
                                 JULY 2, 1997                    NINE MONTHS
                                (INCEPTION) TO    YEAR ENDED        ENDED
                                 DECEMBER 31,    DECEMBER 31,   SEPTEMBER 30,
                                     1997            1998           1999
                                --------------   ------------   -------------
<S>                             <C>              <C>            <C>
Pro forma net loss applicable
  to common stockholders......    $(1,781,000)   $(3,885,000)   $(11,752,000)
                                  ===========    ===========    ============
Pro forma net loss per common
  share.......................    $     (2.03)   $     (2.79)   $      (5.72)
                                  ===========    ===========    ============
</TABLE>

    The pro forma impact of options on the net loss for the year ended
December 31, 1998 and the nine months ended September 30, 1999 is not
representative of the effects on net income (loss) for future years, as future
years will include the effects of additional years of stock option grants.

                                      F-20
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 6:  NET LOSS PER SHARE OF COMMON STOCK

    The calculation of historical and pro forma basic and diluted net loss per
share is as follows:

<TABLE>
<CAPTION>
                                          PERIOD FROM
                                          JULY 2, 1997                        NINE MONTHS ENDED
                                         (INCEPTION) TO    YEAR ENDED           SEPTEMBER 30,
                                          DECEMBER 31,    DECEMBER 31,   ---------------------------
                                              1997            1998           1998           1999
                                         --------------   ------------   ------------   ------------
                                                                         (UNAUDITED)
<S>                                      <C>              <C>            <C>            <C>
HISTORICAL:
  Net loss.............................   $ (1,781,000)   $ (3,879,000)  $ (2,358,000)  $(10,670,000)
                                          ============    ============   ============   ============
  Weighted-average shares of common
    stock outstanding..................      3,777,000       3,395,000      3,490,000      3,256,000
  Less: weighted-average shares subject
    to repurchase......................      2,899,000       2,002,000      2,170,000      1,200,000
                                          ------------    ------------   ------------   ------------
  Weighted-average shares of common
    stock outstanding used in computing
    basic and diluted net loss per
    share..............................        878,000       1,393,000      1,320,000      2,056,000
                                          ============    ============   ============   ============
  Basic and diluted net loss per common
    share..............................   $      (2.03)   $      (2.78)  $      (1.79)  $      (5.19)
                                          ============    ============   ============   ============
PRO FORMA:
  Net loss.............................                   $ (3,879,000)  $ (2,358,000)  $(10,670,000)
                                                          ============   ============   ============
  Weighted-average shares used in
    computing basic and diluted net
    loss per common share..............                      1,393,000      1,320,000      2,056,000
  Adjustment to reflect the effect of
    the assumed conversion of preferred
    stock from the date of issuance....                        926,000        950,000      2,570,000
                                                          ------------   ------------   ------------
  Weighted-average shares used in
    computing pro forma basic and
    diluted net loss per common share
    (unaudited)........................                      2,319,000      2,270,000      4,626,000
                                                          ============   ============   ============
  Pro forma basic and diluted net loss
    per common share (unaudited).......                   $      (1.67)  $      (1.04)  $      (2.31)
                                                          ============   ============   ============
</TABLE>

    If NetRatings had reported net income, the calculation of historical and pro
forma diluted earnings per share would have included approximately an additional
736,000, 848,000 and 2,771,000 common equivalent shares related to outstanding
stock options and warrants not included above (determined using the treasury
stock method) for the years ended December 31, 1998, and the nine months ended
September 30, 1998 and 1999 respectively. In addition, if NetRatings had
reported net income the calculation of historical diluted earnings per share
would have included approximately an additional 1,800,000, 1,500,000, and
4,252,000 common equivalent shares related to the conversion of preferred shares
and convertible notes payable using the if-converted method for the year ended
December 31, 1998 and the nine months ended September 30, 1998 and 1999.

                                      F-21
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 7:  JOINT VENTURE WITH ACNIELSEN

    In September 1999, NetRatings entered into a joint venture with ACNielsen to
develop and maintain audience measurement panels and to market NetRatings
products and services in key international markets. Through the joint venture,
in which NetRatings holds a 19.9% minority interest, NetRatings plans to launch
audience measurement services in over 30 countries.

    The joint venture pays NetRatings a fee based on a percentage of the joint
venture's sales, subject to a minimum of $7.5 million and maximum of
$15 million over five years. Revenue from the joint venture's Internet audience
measurement services will be allocated between NetRatings and the joint venture
depending on the location of the customer and the location of the panel whose
data is used in the service:

    - The joint venture retains 100% of any revenue from services that the joint
      venture sells to customers outside North America based on data from panels
      outside North America.

    - NetRatings and the joint venture each retain 50% of any revenues from
      services that NetRatings sells to customers in North America based on data
      from panels outside North America or services that the joint venture sells
      to customers outside North America based on North American panel data.

    - The joint venture retains 35% of any revenue from services that the joint
      venture sells to customers inside the United States and Canada based on
      data from panels inside those countries, and NetRatings retains 65% of any
      revenue from such services.

    - If either NetRatings or the joint venture sells services based on data
      from a combination of panels located both inside and outside North
      America, the allocation of revenues is determined by an operating
      committee consisting of two representatives of each company, with any
      decisions requiring a unanimous vote of those present, which must include
      at least one representative of each company.

    NetRatings did not receive any revenue from the joint venture for the nine
months ended September 30, 1999.

    The joint venture was initially capitalized through cash contributions by
NetRatings for the purchase of common stock and cash contributions by ACNielsen
for the purchase of preferred stock. To complete the initial capitalization of
the joint venture, ACNielsen has agreed to contribute cash to fund the initial
roll-out costs, consisting of the costs incurred to establish Internet audience
measurement panels in each of the countries targeted by the joint venture, as
such costs are incurred by the joint venture, and NetRatings has granted an
exclusive license with respect to its data collection technology for the covered
territory, subject to specified performance criteria. The preferred stock
initially purchased by ACNielsen, together with any additional preferred stock
purchased as part of the funding of the initial roll-out costs, will continue to
have an 81.1% voting interest and be convertible into 81.1% of the common stock
of the joint venture. All preferred stock issued by the joint venture will have
a liquidation preference equal to the original purchase price.

    NetRatings has entered into a stockholders agreement with ACNielsen setting
forth procedures for funding the ongoing operations of the joint venture. Apart
from the initial roll-out costs, the capital requirements of the joint venture
will be the responsibility of both companies in proportion to their relative
voting interests in the joint venture. Prior to September 23, 2001, however,
ACNielsen has agreed to advance capital requirements by either purchasing
additional stock, making loans to the joint

                                      F-22
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 7:  JOINT VENTURE WITH ACNIELSEN (CONTINUED)

venture bearing interest at the prime rate, or arranging loans from third
parties. At the end of this period, the joint venture must repay any such loans
from ACNielsen, and NetRatings must reimburse ACNielsen for its pro rata portion
of any such stock purchases, after which the additional stock issued to
ACNielsen will be retired. Under the stockholders agreement, ACNielsen has a
right of first refusal to purchase any shares of the joint venture that
NetRatings wishes to sell to a third party. In addition, if the joint venture
does not effect an initial public offering within five years, NetRatings has the
right to require ACNielsen to purchase the NetRatings equity stake at its then
current fair market value.

NOTE 8:  RELATED PARTY TRANSACTIONS

    Concurrent with the sale of Series A preferred stock, NetRatings and a
related party entered into a technology transfer agreement which assigned and
transferred to NetRatings all ownership interest in NetRatings' core products
and technology. In January 1998, in consideration of these technology
assignments and transfers, NetRatings paid to the related party $100,000 in
cash.

    In April 1999, NetRatings entered into a barter transaction under which an
annual subscription to a NetRatings service valued at $50,000 was exchanged for
web site design services provided by a company, one of whose officers is a
member of the NetRatings board of directors. The subscription was valued at its
fair value using NetRatings normal pricing and terms.

    As described in Note 5, in August 1999, Nielsen Media Research converted its
notes payable into shares of Series C preferred stock and purchased $6 million
of Series C preferred stock. NetRatings also entered into an operating agreement
covering its relationship with Nielsen Media Research. Under the terms of the
operating agreement, NetRatings pays Nielsen Media Research a commission for
selling services to certain customers. These commissions total $334,000 for the
nine months ended September 30, 1999 and are included in sales and marketing
expenses in the accompanying statements of operations. NetRatings is also
charged by Nielsen Media Research for costs of maintaining the panel at the
rates. Nielsen Media Research charges its own internal divisions. These costs
total $3,883,000 for the nine months ended September 30, 1999 and are included
in cost of revenue in the accompanying statements of operations.

                                      F-23
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 9:  COMMITMENTS AND CONTINGENCIES

LEASES

    As of September 30, 1999, minimum payments under all noncancelable lease
agreements were as follows:

<TABLE>
<CAPTION>
                                                          CAPITAL    OPERATING
                                                           LEASES     LEASES
                                                          --------   ---------
<S>                                                       <C>        <C>
October to December 31, 1999............................  $ 35,000   $ 64,000
Year ending December 31, 2000...........................   208,000    131,000
Year ending December 31, 2001...........................   159,000         --
Year ending December 31, 2002...........................    65,000         --
                                                          --------   --------
Total minimum lease payments............................   467,000   $195,000
                                                                     ========
    Less amount representing interest...................  (101,000)
                                                          --------
Present value of minimum lease payments.................   366,000
    Less current portion................................  (162,000)
                                                          --------
Long-term capital lease obligations.....................  $204,000
                                                          ========
</TABLE>

    NetRatings leases its facility under an operating lease agreement which
expires in September 2000.

    Rent expense was $32,000 for the period from July 2, 1997 (inception) to
December 31, 1997, $103,000 for the year ended December 31, 1998 and was $72,000
and $142,000 for the nine months ended September 30, 1998 and 1999.

    In June 1999, NetRatings entered into a loan and security agreement under
which the lender committed to equipment financing up to a principal amount of
$700,000 at an interest rate of 8% per annum. This facility expires on April 30,
2000. As of September 30, 1999, no borrowings were outstanding under this
facility. In conjunction with the availability of this equipment financing
commitment, NetRatings issued warrants to purchase 26,000 shares of common stock
at an exercise price of $2.12 per share. The warrant has a term of nine years.
At the date of grant, the fair value ascribed to the warrants was approximately
$132,000, based on a Black-Scholes valuation model and was recorded as deferred
financing costs and is being amortized over the term of the facility.

BANK LINE OF CREDIT

    In September 1999, NetRatings secured a $1,000,000 bank line of credit
expiring in one year with interest at the prime rate. The line of credit also
has an additional $350,000 available to NetRatings to fund fixed asset
purchases. Draws on the fixed asset facility are due over a 36 month period with
interest at the prime rate. The line of credit requires that NetRatings maintain
compliance with certain restrictive financial covenants. No borrowings have been
made under this agreement.

PENDING LITIGATION

    On November 4, 1999, PaineWebber Incorporated filed a lawsuit against
NetRatings in the Supreme Court of the State of New York for the County of New
York. The suit involves an agreement entered into in May 1999 in which
NetRatings engaged PaineWebber to act as a financial advisor with respect to a
potential strategic transaction. The specific transaction for which PaineWebber
was

                                      F-24
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 9:  COMMITMENTS AND CONTINGENCIES (CONTINUED)

engaged was not consummated. However, the lawsuit alleges that NetRatings
breached the obligations under the agreement by failing to pay PaineWebber a fee
based upon the subsequent sale of equity securities to Nielsen Media Research
and by failing to retain PaineWebber as a managing underwriter for the initial
public offering. The complaint seeks damages in the aggregate amount of not less
than $1.9 million and reimbursement for PaineWebber's attorneys' fees relating
to the dispute. Management believes, based on consultation with counsel, that
NetRatings has substantial defenses to PaineWebber's claims, and NetRatings
intends to defend the lawsuit vigorously. NetRatings expects to incur
substantial legal fees and expenses in connection with the litigation. The
litigation is in the preliminary stage, and management is unable to predict its
final outcome. However, management currently believes that the resolution of
this matter will not have a material adverse impact on NetRatings' financial
position, results of operations or cash flows. Depending on the amount and
timing, an unfavorable resolution could materially affect NetRatings' future
results of operations or cash flows in a particular period.

NOTE 10:  EMPLOYEE BENEFIT PLAN

    NetRatings has a 401(k) plan which stipulates that all full-time employees
can elect to contribute to the 401(k) plan, subject to certain limitations, up
to 15% of salary on a pretax basis. NetRatings has the option to provide
matching contributions but has not done so to date.

NOTE 11:  INCOME TAXES

    No income tax expense was recorded for the period from July 2, 1997
(inception) to December 31, 1997, the year ended December 31, 1998, or the nine
months ended September 30, 1999 due to net operating losses.

    The difference between the provision for income taxes and the amount
computed by applying the federal statutory income tax rate to income before
taxes is explained below:

<TABLE>
<CAPTION>
                                          PERIOD FROM
                                          JULY 2, 1997                    NINE MONTHS
                                         (INCEPTION) TO    YEAR ENDED        ENDED
                                          DECEMBER 31,    DECEMBER 31,   SEPTEMBER 30,
                                              1997            1998           1999
                                         --------------   ------------   -------------
<S>                                      <C>              <C>            <C>
Income tax benefit at federal statutory
  rate.................................     $(606,000)    $(1,326,000)    $(3,628,000)
Unutilized net operating losses........       606,000       1,326,000       3,628,000
                                            ---------     -----------     -----------
Total..................................     $      --     $        --     $        --
                                            =========     ===========     ===========
</TABLE>

                                      F-25
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 11:  INCOME TAXES (CONTINUED)

    Significant components of NetRatings' deferred tax assets are as follows:

<TABLE>
<CAPTION>
                                                     AS OF
                                                  DECEMBER 31,            AS OF
                                             ----------------------   SEPTEMBER 30,
                                               1997        1998           1999
                                             --------   -----------   -------------
<S>                                          <C>        <C>           <C>
Deferred tax assets:
  Net operating loss carryforwards.........  $ 8,000    $ 1,500,000    $ 4,700,000
  Tax credit carryforwards.................       --        100,000        170,000
  Other....................................       --         40,000        860,000
                                             -------    -----------    -----------
Total deferred tax assets..................    8,000      1,640,000      5,730,000

Valuation allowance........................   (8,000)    (1,640,000)    (5,730,000)
                                             -------    -----------    -----------
Net deferred tax assets....................  $    --    $        --    $        --
                                             =======    ===========    ===========
</TABLE>

    FASB Statement No. 109 provides for the recognition of deferred tax assets
if realization of such assets is more likely than not. Based upon the weight of
available evidence, which includes NetRatings' historical operating performance
and the reported cumulative net losses in all prior years, NetRatings has
provided a full valuation allowance against its net deferred tax assets.
NetRatings will continue to evaluate the realizability of the deferred tax
assets on a quarterly basis.

    The net valuation allowance increased by $8,000 during the period July 2,
1997 (inception) to December 31, 1997, by $1,632,000 during the year ended
December 31, 1998, and by $4,090,000 for the nine months ended September 30,
1999.

    As of September 30, 1999, NetRatings had net operating loss carryforwards
for federal and state income tax purposes of approximately $11.9 million.
NetRatings also had federal and state research and development tax credit
carryforwards of approximately $100,000 and $80,000 as of September 30, 1999.
The federal and state net operating loss and tax credit carryforwards will
expire at various dates beginning in 2005, if not utilized.

    Utilization of the net operating loss and tax credit carryforwards may be
subject to a substantial annual limitation due to the ownership change
limitations provided by the Internal Revenue Code of 1986, as amended, and
similar state provisions. The annual limitation may result in the expiration of
the net operating loss and tax credit carryforwards before utilization.

NOTE 12:  INVESTMENT IN NETRATINGS, K.K.

    In June 1999, NetRatings granted a five year license for the use of its
proprietary software to NetRatings, K.K., in exchange for a 32% ownership
interest in NetRatings, K.K. The joint venture was formed to adapt, market,
service and sell interactive media and market research data in Japan. After the
initial five year period, the license is automatically renewed on a yearly basis
for no additional consideration. As NetRatings contributed technology to this
joint venture, it did not record any cost for this investment. NetRatings is
entitled to appoint one member to the six-member board of directors of
NetRatings, K.K.

                                      F-26
<PAGE>
                                NETRATINGS, INC.

                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)

      (INFORMATION AS OF SEPTEMBER 30, 1998 AND FOR THE NINE MONTHS ENDED
                        SEPTEMBER 30, 1998 IS UNAUDITED)

NOTE 13:  SUBSEQUENT EVENTS (UNAUDITED)

1999 EMPLOYEE STOCK PURCHASE PLAN

    On October 26, 1999, NetRatings' Board of Directors adopted, subject to
stockholder approval, the 1999 Employee Stock Purchase Plan to be effective upon
the completion of NetRatings' initial public offering of its common stock.
NetRatings has reserved a total of 250,000 shares of common stock for issuance
under the plan. Eligible employees may purchase common stock at 85% of the
lesser of the fair market value of the Company's common stock on the first day
of the applicable offering period or the date of purchase.

1998 STOCK PLAN

    On November 9, 1999, an additional 1,000,000 shares were reserved for
issuance under the 1998 Stock Plan.

                                      F-27
<PAGE>
                               [NETRATINGS LOGO]
<PAGE>
                                4,000,000 SHARES

                               [NETRATINGS LOGO]

                                  COMMON STOCK

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

                                   PROSPECTUS
                                DECEMBER 8, 1999

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

                                LEHMAN BROTHERS
                         BANC OF AMERICA SECURITIES LLC
                               CIBC WORLD MARKETS
                             C.E. UNTERBERG, TOWBIN


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