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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

(Mark One)

For the fiscal year ended December 31, 2000

OR

Commission file number: 000-27907

NETRATINGS, INC.
(Exact name of Registrant as specified in its charter)

Registrant's telephone number, including area code: (408) 957-0699

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

Common Stock
(Title of Class)

   Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes /x/ No / /

   Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. / /

   The aggregate market value of the voting stock of the Registrant held by non-affiliates of the Registrant, based on the closing price of the Registrant's Common Stock as quoted on the Nasdaq National Market on March 22, 2001, was $102,638,005. Shares of Common Stock held by each officer and director and by each person who owns 5% or more of the outstanding Common Stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

   The number of shares of the Registrant's Common Stock outstanding as of March 22, 2001, was 32,819,055.

DOCUMENTS INCORPORATED BY REFERENCE

   Parts of the definitive proxy statement for registrant's 2001 Annual Meeting of Stockholders to be filed with the Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Report are incorporated by reference into Part III of this Report.

PART I

ITEM 1. BUSINESS

    THE FOLLOWING DESCRIPTION OF THE COMPANY'S BUSINESS CONTAINS FORWARD-LOOKING STATEMENTS WHICH INVOLVE RISKS AND UNCERTAINTIES. IN THIS REPORT, THE WORDS "ANTICIPATES," "BELIEVES," "EXPECTS," "INTENDS," "FUTURE" AND SIMILAR EXPRESSIONS IDENTIFY FORWARD-LOOKING STATEMENTS. THE COMPANY'S ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THOSE SET FORTH IN THESE FORWARD-LOOKING STATEMENTS AS A RESULT OF A NUMBER OF FACTORS, INCLUDING THOSE SET FORTH IN THIS ANNUAL REPORT ON FORM 10-K UNDER THE HEADING, "FACTORS THAT MAY AFFECT OUR PERFORMANCE."

OVERVIEW

    We provide technology-driven Internet audience information solutions for media and commerce. Our products and services enable our customers to make informed business-critical decisions regarding their Internet strategies. We deliver accurate and timely information about Internet user behavior, collected directly and automatically from representative samples of Internet users throughout the world, and augment this information with detailed, flexible reporting and in-depth analysis. Our customers include leading advertising agencies, media companies, technology companies, business services companies, retailers/marketers, and Internet companies. 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 global provider of market research information and analysis to the fast moving consumer packaged goods and services industries and media measurement services. We believe that these relationships enable us to offer the most accurate and globally comprehensive Internet audience information currently available. Our proprietary activity tracking and data collection technology gathers comprehensive and detailed information regarding Internet user behavior, including site visit, advertising exposure and response, commerce transactions and streaming media usage information. 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, the size and scope of our audience panels, and our strategic relationships have established us as a leader 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 communication, 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, (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 2.2 billion at the end of 1999, and is expected to grow to approximately 25.9 billion in 2004. Also, according to IDC, the number of users buying goods and services on the Internet worldwide has grown from approximately 3 million in 1995 to approximately 63 million in 1999, and is expected to grow to approximately 290 million in 2004. In the United States 2.5 million users bought goods and services in 1995, 38 million in 1999 and by 2004 in excess of 85 million users are expected to consummate an online purchase. IDC estimates that the total annual value of goods and services purchased over the Internet worldwide has grown from approximately $296 million in 1995 to approximately $131 billion in 1999, and is expected to grow to over $2.6 trillion by 2004, yielding a 5-year compound annual growth

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rate, "CAGR," of 81.7%. According to IDC, in the United States alone online, commerce spending has increased form $290 million in 1995 to $80.5 billion in 1999 and will reach $1 trillion in 2004, representing a CAGR of 65.5% for the period 1999–2004.

    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 $8.3 billion in 2000 to approximately $33.3 billion in 2004 with the U.S. accounting for $24.8 billion of the total.

    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 238.7 million at the end of 1999 and is expected to grow to approximately 958.3 million by the end of 2004 with the United States accounting for 10.2 million, 137.1 million and 443.4 million of the worldwide numbers, respectively.

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 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. While the prospect of reaching consumers with advertising and influencing their buying patterns via this exciting new media remains quite strong, the online advertising market is undergoing a transition. Online advertising spending is trending toward traditional advertisers and away from Internet companies. We believe that this is a healthy transition, and a natural evolution of the industry, as traditional advertisers recognize the power of targeting their audiences online.

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. 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.

Commerce Measurement

    Rising volumes of online shoppers and e-commerce spending have raised the complexity associated with understanding customer needs, competitive trends, and changing market dynamics. Additionally, online merchants are more intent on driving focused, profitable marketing and merchandising

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programs. These factors have combined to drive retailers and their suppliers toward detailed, timely commerce measurement solutions that provide an accurate market understanding so they can service a growing wave of shoppers in a cost-controlled marketing climate.

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 good times and, perhaps more importantly, in bad, companies need accurate, timely audience behavior information. 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:

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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 audience sample using proven and consistent 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.



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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 enables 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; 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 "conversion rate"; 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, amounts spent on both online and off-line advertising or to track a competitor's advertisement placements; track streaming media usage on Web sites and actual connection speeds of users; and identify significant trends relating to online companies and Internet usage.



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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.

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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 more adequately meet these needs.

The NetRatings Solution

    We deliver meaningful and timely information about Internet user behavior that enables our customers to make informed business-critical decisions regarding their Internet strategies. Our technology-driven solutions provide accurate Internet audience information combined with detailed, 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. Because our information is based on the behaviors of a sample of the Internet population, the degree to which the sample represents the total population affects the accuracy of the reported data. We believe that our strategic relationships with Nielsen Media Research and ACNielsen allow 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 United States and Canadian panels using the same sampling methodology that it uses in developing television audience panels. In addition, through our joint ventures with ACNielsen, NetRatings Japan, and Mediametrie, we utilize a consistent sampling methodology and provide Nielsen//NetRatings solutions in 21 international markets. We believe that the use of one consistent and high quality sampling methodology worldwide is a strategic advantage for us.

    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, bandwidth usage data, and streaming media usage. The software also collects key information regarding activity on America Online's proprietary service, and other application usage. Since our inception, 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.

    Privacy.  We believe that protecting people's privacy is fundamental to the growth and widespread adoption of the Internet and are committed to ensuring that the privacy of our panel members is maintained. Each household and each at-work panelist "opts-in" to participate in our panels and consents to our use of the information we collect from it. The data we collect from each panelist is aggregated with the data from all other panelists and we do not report any personally identifiable information. We have in place security measures, including encryption methods, to protect the security

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and confidentiality of personally identifiable information we obtain from our panelists and we do not sell any personally identifiable information.

    Global Solution.  Many of our customers conduct business in multiple geographic locations and need data from their local market activities. Through our joint ventures with ACNielsen, NetRatings Japan, and Mediametrie, we offer the Nielsen//NetRatings service in 21 countries covering approximately 89% of the worldwide Internet population. By providing one consistent methodology, worldwide under the Nielsen//NetRatings brand, we are able to provide our customers with reliable independent information in their local markets.

    Powerful, Flexible Reporting Systems.  Our customers require quick and easy access to the right information. 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 myNielsen//NetRatings interface provides immediate access to various levels of detailed information, allows users to create and save their own reports, and enables "on-the-fly" custom queries on selected information. Our core audience measurement 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 reports provide customers with comprehensive pre-defined site rankings, Internet user behavior and demographic information. We also provide Select Views reports, which are powerful, easy-to-use, menu-driven queries that respond to specific information requests.

    Timely, Insightful Analysis.  Our solution also delivers insightful data-driven analysis based upon the detailed Internet audience information we collect and report. We augment our high-quality audience behavior information with meaningful analysis delivered on a timely basis, enabling our customers to make more informed business decisions. The analytical services we provide are structured to deliver information and commentary on a weekly, monthly and quarterly timeframe. Additionally, we provide timely and detailed event-based reports, such as Internet activity during holiday shopping periods. Customers purchasing our analytical services are entitled to a fixed number of consulting hours and private access to our analysts for strategic consultation or custom analysis.

    Compatible, Portable Data Collection 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 technology-driven information solutions for online media and commerce. We intend to establish this leadership position through the following key strategies:

    Leverage Our Strategic Relationships.  We will continue to leverage and expand our key strategic relationships with Nielsen Media Research and ACNielsen, each of which is a wholly owned subsidiary of VNU N.V., 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 and ACNielsen, we have deployed our products and services to over 770 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. We also look to leverage our other existing partnerships with

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companies such as Claritas, Gartner Group, Harris Interactive, and Spectra in addition to further expanding this group of partners.

    Increase the Size, Scope and Number of Our Audience Measurement Panels.  We intend to expand the size, scope, and number of our worldwide audience measurement panels in order to increase the geographic coverage and depth of information that we can provide to customers. We believe that expanding our home and work panels will enable us to provide more detailed global information regarding e-commerce trends and streaming media usage, as well as more accurate information regarding smaller Internet sites and more focused advertising campaigns. In addition, we believe that, as the Internet and television converge, expanding our initial convergence panels in conjunction with Nielsen Media Research will also be a strategic advantage for us.

    Capitalize on Our Access to Information to Develop New Products and Enter New Markets.  We will continually innovate and introduce new products that will capitalize on our access to the extensive Internet and application 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 and timely information on Internet usage available. As the volume and complexity of Internet usage increases, we anticipate 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 and complementary data sources that will allow us to create solutions that meet these requirements. Additionally, we will continue to develop new ways to analyze and present the information we collect in the form of data driven analytical services. During the past year, we have enhanced our advanced reports and analyses specifically targeted to the investment community, media segment, fast-moving consumer packaged goods providers and e-commerce companies, and we expect to introduce similar products for the online business-to-business customers. We will continue to leverage our audience data and analytical services to provide customers with in-depth, specialized consulting services and custom panel measurement services.

    Expand Internationally.  We will continue to capitalize on the global demand for Internet usage information by continuing to establish panels in major international markets and expanding our customer base to include more international companies. In June 1999, we formed NetRatings Japan, a Japanese joint venture, to allow us to provide our products and services to the Japanese market. NetRatings Japan began delivering our Nielsen//NetRatings branded Audience Measurement Service in Japan during February 2000. 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 have developed audience measurement panels in Australia, Brazil, Denmark, Finland, Germany, Hong Kong, Ireland, Italy, Korea, Netherlands, New Zealand, Norway, Singapore, Spain, Sweden, Taiwan, and the United Kingdom and are in the process of developing panels in Austria, Belgium, Israel, Mexico, South Africa, and Switzerland. In January 2000, we established a joint venture in France, Mediametrie eRatings.com, to allow us to provide our products and services to the French market. 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. We currently offer our Internet audience measurement services in 21 countries and have begun development efforts in an additional 6 countries. Our strategy includes the continued expansion of our global presence and we anticipate that we will provide audience measurement services in approximately 30 countries by the end of 2001.

    Position Ourselves to Capitalize on the Convergence of Television and the Internet.  We intend to continue 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

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information about usage behavior. Our relationships with Nielsen Media Research and ACNielsen allow us to combine their experience and expertise in television audience measurement with our own Internet measurement technology and uniquely positions us to provide convergence solutions. In collaboration with Nielsen Media Research, we have established a "convergence lab" project whereby we measure the television viewing patterns and PC-based Internet usage within the same U.S. households. We believe this research will yield meaningful new insights on the interplay between the Internet and television—a topic of major significance to advertisers and marketers. We intend to continue 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

    Over the past 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 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. In December 1999, following our initial public offering, Nielsen Media Research exercised its right to make an additional equity investment and acquire a controlling interest in our company, including the right to elect a majority of our Board of Directors. Nielsen Media Research is a wholly owned subsidiary of VNU N.V.

    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 U.S. 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:

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



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determination of the pricing of the Internet audience measurement services;



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oversight of product quality control; and



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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

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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 year ended December 31, 2000, we derived 18% of our total revenue from Nielsen Media Research generated billings.

    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.

    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.

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

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mutual agreement of the parties;



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



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

    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 77 years ago, ACNielsen has become a leading provider of media research services, including television audience measurement, 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 in addition to providing television audience measurement services outside of the United States to customers in over 100 countries. ACNielsen is a wholly owned subsidiary of VNU N.V.

    In September 1999, we established a joint venture with ACNielsen, ACNielsen eRatings.com, 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 this joint venture, we are currently providing Internet audience measurement data in 19 countries and we anticipate providing these services in over 30 countries by the end of 2001. 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 ACNielsen eRatings.com joint venture provides products and services that are based on data collected from Internet measurement panels that are established and maintained using the ACNielsen proprietary sampling methodology. Panel members collect and deliver their Internet usage data using our proprietary collection software. The joint venture or ACNielsen is responsible for establishing and

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maintaining the joint venture's audience measurement panels, and ACNielsen is paying the costs associated with the establishment and maintenance of these panels in the countries initially targeted by the joint venture. The countries to be 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 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.

    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 services in the United States and Canada. Under this operating agreement, we have agreed not to offer any Internet audience measurement service in countries outside the United States and Canada. In addition, the joint venture and ACNielsen have agreed not to offer any competing Internet audience measurement service anywhere in the world.

    Revenue from the joint ventures' Internet audience measurement services is allocated between NetRatings and the joint ventures depending on the location of the customer and the location of the panel whose data is used in the service:

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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;



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NetRatings and the joint venture each record a 50% international panel fee 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.



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The sale of data generated by a panel outside of North America results in a technology royalty of 7-10% of such revenue, depending on the joint venture. However, during the five year period commencing October 1, 1999, the ACNielsen eRatings.com joint venture shall pay to NetRatings a minimum fee of $7.5 million and a maximum fee of $15 million for such five year period.



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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.

    To complete the initial capitalization of the joint venture, ACNielsen has contributed 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 the joint venture's operating committee. ACNielsen has publicly announced that it expects to spend approximately $50 million by the end of 2001 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

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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 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. As of December 31, 2000, NetRatings has recorded accrued capital contributions related to the joint venture of $2.4 million which, under the agreement, will be payable in September 2001.

    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. 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, the joint venture and ACNielsen have 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 syndicated products and services, which are marketed under the Nielsen//NetRatings brand and sold primarily on an annual subscription basis, include:

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

eCOMMERCE SERVICES.  These services, offering both information reports and data-driven analytics, focus specifically on audience behavior related to electronic commerce. Reported measures include loyalty and retention indicators, cross-site visitation reports, conversion rate information, purchase amounts, shopping satisfaction and purchase intent.

MEDIA AND ADVERTISING SERVICES.  These services, offering both information reports and data-driven analytics, provide special purpose information for such areas as online advertising spending and effectiveness, streaming media usage and user bandwidth measurement.

AUDIENCE MEASUREMENT SERVICES  

    We provide a range of syndicated weekly and monthly Internet audience measurement reports that can be accessed online through our customizable myNielsen//NetRatings user interface. 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. In addition, we provide industry based audience measurement services such as our Local Market Service, Internet Investment Strategies Service, and our PRIZM Service.

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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.

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, allowing 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.

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

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.

SITE REPORTS

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BANNERTRACK ADVERTISING REPORTS

LOCAL MARKET SERVICE

These reports evaluate U.S. audience traffic patterns by Designated Market Area, or DMA. We currently report information for 35 DMAs. The reports offer valuable insights into the local reach and audience composition of sites on a market by market basis, allowing media companies and advertisers to more effectively target audiences on a local and regional basis.

PRIZM SERVICE

Claritas' PRIZM segmentation system is a well understood and popular way to identify consumers by their lifestyle and geographic location. Our PRIZM reports evaluate Internet behavior by these PRIZM segments. Marketers familiar with PRIZM can use this information to understand the online behaviors and site visitation habits and compare that to the offline media usage of their target segments.

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. Financial services firms utilize our Internet Investments Strategies service to evaluate the performance of their online trading initiatives and those of their competitors. In addition, these firms use this service to help measure the online performance of companies on which the firm provides "sell side" research for as well as using our data to evaluate the online performance of competing companies. Our service provides the subscribing firm with audience measurement metrics, syndicated analytical reports, and a predetermined number of consultation hours with our staff of analysts.

eCOMMERCE SERVICES

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

eCOMMERCE STRATEGIES SERVICE

Through the E-Commerce Strategies service, our customers gain an actionable understanding of visitors, shoppers, buyers, and competitors. Extensive data reports offer point-and-click access to key metrics such as visitor loyalty, site importance, secure mode activity, audience measures, ranking, and competitive shopping matrices. Written analytical reports help merchants with their marketing strategies, identify new trends and specific merchant sales conversion rates, and warn of

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changes in the market. Direct access to a team of e-commerce analysts provides Nielsen//NetRatings clients with a competitive edge in the changing e-commerce marketplace. In December 2000, 75% of Web users went shopping online and 43% of those made purchases online, repeatedly overwhelming merchants who realized that their own internal analysis and reporting lacks an understanding of non-buyers, competitor activities, and much more.

As e-commerce continues along a stable growth curve, with online shopping trips in 2000 up 52% over 1999, the E-Commerce Strategies service unleashes the wealth of data obtained from the Nielsen//NetRatings audience panel to provide detailed, timely, and actionable insights for online merchants, their brick-and-mortar counterparts, investors, and suppliers.

eCOMMERCE PULSE

In January 2001, we introduced our eCommercepulse product which we have developed in partnership with Harris Interactive. Harris Interactive is a leader in providing survey-based data that leverages more than 7 million participating panelists. This online-survey-based product is designed to provide detailed purchasing and satisfaction information from a monthly random survey of 33,000 Internet users. Reports are delivered on a vertical product category basis for 14 different categories. Reported measures include amount spent by product category, number of online shopping experiences and transactions, amount spent offline for each dollar spent online, future purchase intent and a variety of satisfaction measures.

MEDIA AND ADVERTISING SERVICES.

    This series of information reports and written analysis focuses on competitive advertising spending and effectiveness as well as the impact of bandwidth and streaming media usage on content and delivery strategies and is targeted toward the advertising agencies in addition to the media Internet companies.

ADSPECTRUM

AdSpectrum is a competitive advertising expenditure measurement service. Key reports include: Top Ad Spenders and Sellers, Top Advertisers, New Creative, and Top banners. AdSpectrum is unique in its reporting of advertising occurrences as seen by actual Internet users. This approach allows AdSpectrum to accurately report such measures as click rate, demographic profiles of audiences exposed to specific campaigns, and other advertising effectiveness metrics. AdSpectrum spending estimates are based on survey data collected from actual ad buys, as opposed to rate card pricing, making spending estimates a more accurate reflection of real-world spending than competing services.

INTERNET MEDIA STRATEGIES SERVICE

This series of reports and data-driven analyses investigates issues pertinent to media and content sectors, such as usage of streaming media, impact of bandwidth on Internet usage and local market usage. This service also focuses on the evolving convergence of television and the Internet and the factors that affect its progress. Users can select from a series of data-oriented reports in addition to utilizing a predetermined number of consultation hours with our staff of analysts.

Audience Measurement Methodology

    Our Internet measurement products and services extend to the Internet the Nielsen 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

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Nielsen//NetRatings information into the development of comprehensive media, marketing and product plans. As of December 31, 2000 our United States at-home Internet panel consisted of more than 61,000 persons.

    We have also developed a high-quality panel of at-work Internet users in the U.S. 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 and began reporting data from the panel in February 2000. As of December 31, 2000 this at-work panel consisted of over 7,700 members and we expect to have more than 10,000 panel members by the end of 2001. At-work panels are currently being recruited in countries outside of the United States through our joint venture with ACNielsen and we anticipate reporting on these panels during 2001.

    Globally, we have over 220,000 users participating in our media research panels in 21 countries. 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. In order to more accurately gauge the size and shape of the rapidly changing Internet user universe, we conduct our independent 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 panels are 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 incentive in the form of a 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.

Technology

    Through the use of our proprietary tracking software, we have 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 viewed by the audience;



•

tracking of e-commerce purchase activity and related audience behavior;

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•

tracking of streaming media usage and user bandwidth consumption; and



•

tracking of use of other applications run on the panelists' PC.

    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 or Macintosh 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 and the users that viewed these activities;



•

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 ensuring the privacy of panelist data.

    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.

Customers

    More than 770 customers globally currently use our services for a wide range of purposes including strategic 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. As of December 31, 2000, 35% of the Fortune 100 were subscribers to Nielsen//NetRatings services. The following table is a list of our top three customers based on contract value in each of our principal customer sectors.

Sales and Marketing

    Nielsen//NetRatings products and services are sold by NetRatings and Nielsen Media Research in their respective markets in North America, and by ACNielsen eRatings.com and related joint venture partners in their respective International markets. As of December 31, 2000, we had 35 sales representatives located in Milpitas, California, New York, Boston, Chicago, Washington, DC, Atlanta, Denver, Austin, Los Angeles, and Chatham, New Jersey. NetRatings sales representatives receive a base salary and are eligible for commissions based on revenue and sales goals while NetRatings

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provides a 35% commission to Nielsen Media Research for the sale of products by its sales representatives to cover sales and marketing costs. Nielsen Media Research, ACNielsen eRatings.com, and our other joint venture partners also resell the U.S. audience measurement services to their international base of Nielsen//Netratings customers. Other partners such as Spectra, Claritas, Scarborough Research and Giga Research resell either existing Nielsen//NetRatings services our customized data from our services as part of their product offerings.

    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 publicity for 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, webcasts, and participation at industry events by our executive officers. In addition, we provide daily unique audience information for top Internet sites to the Bloomberg service, which distributes online financial information to 140,000 terminals worldwide. Each week, Advertising Age magazine features an entire page of Internet audience and advertising data from our service. Standing arrangements for use of our data also exist with key business and trade press including Reuters, New York Times, U.S. News and World Report, Industry Standard, USA Today, Entertainment Weekly, Hollywood Reporter, Business 2.0, CNBC, and CBS Marketwatch.

International Operations

    We believe that global expansion of the Nielsen//NetRatings service is a critical component in establishing a worldwide currency for Internet audience measurement. In June 1999, we commenced our international expansion by establishing our first joint venture, NetRatings Japan. As of December 31, 2000, we held a 26% ownership interest, our joint venture with ACNielsen has a 20% interest and the remaining ownership is held by several Japanese investors. NetRatings Japan 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 Japan for use in Japan. NetRatings Japan has modified this technology for use in Japan, has recruited a Japanese audience panel, and is currently reporting data.

    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."

    In January 2000, we established a joint venture in France, Mediametrie eRatings.com, in which we currently hold a 30% ownership interest. In addition, our joint venture with ACNielsen currently holds a 20% ownership interest. Mediametrie eRatings.com is responsible for building and maintaining a French audience measurement panel and introducing the Nielsen//NetRatings branded products and services to the French Market.

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 toward internal research and product development activities. Our research and development activities are organized into three functional areas: data collection technology development, reporting systems development, and research methodology.

    During 1998, 1999 and 2000, our research and development expenses were $1.2 million, $3.1 million and $6.6 million, respectively. As of December 31, 2000, we had 51 employees engaged in research and development activities.

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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 be issued 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.

    On March 27, 2001, Jupiter Media Metrix filed a suit against us and another, unaffiliated company in the United States District Court of Delaware alleging infringement of U.S. Patent No. 6,115,680—see "Item 3—Legal Proceedings." In the future other third parties may also 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 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 rapidly evolving and becoming increasingly competitive. In the market for Internet audience measurement services, our principal competitor is Jupiter Media Metrix. Competition in Internet audience measurement is also offered by PC Data, Inc. and Comscore Networks in the United States. Globally, we face competition from NetValue, a French company which provides audience measurement services in the U.S. and major markets in Europe and Asia. Other international competitors are more regionally focused and include Red Sheriff and iamasia. We expect competition in our market to intensify in the future.

    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 and commerce. We therefore believe that one leading provider is likely to emerge in the market for Internet audience measurement services. Jupiter 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 worldwide 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;

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•

the availability of geographically comprehensive global activity data;



•

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



•

pricing.

    Some of our competitors have longer operating histories, larger customer bases, and greater 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.

Employees

    As of December 31, 2000, we had 160 full-time employees. Our future success is substantially dependent on the performance of our senior management and key technical personnel, and our continuing ability to attract and retain highly qualified technical and managerial personnel.

    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.

ITEM 2. PROPERTIES

    Our corporate headquarters are located in Milpitas, California. We lease approximately 40,000 square feet for our headquarters which includes research and development, sales and marketing, and general and administrative operations, under leases expiring in 2005. We also lease a sales office in Chatham, New Jersey.

ITEM 3. LEGAL PROCEEDINGS

    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 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 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 our initial public offering.

    On June 28, 2000 the court ruled in our favor in connection with our motion to dismiss PaineWebber's claims that we improperly failed to retain PaineWebber as a managing underwriter in our initial public offering but granted PaineWebber's motion for summary judgment as to its liability on the claim that we failed to pay PaineWebber a fee based upon our sale of equity securities to Nielsen Media Research.

    Both parties initially filed Notices of Appeal in connection with the above rulings, but those notices of Appeal have been mutually withdrawn. At the same time, the parties have cross-moved for summary judgment fixing the amount of damages. Although PaineWebber's original complaint sought damages in the aggregate amount of not less than $1.9 million on all claims and reimbursement for PaineWebber's attorneys' fees relating to the dispute, PaineWebber has increased its assessment of its

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alleged damages relating to the claims for which it has received summary judgment to approximately $3 million (plus interest.)

    We intend to vigorously dispute PaineWebber's damage analysis. Since the court has not yet ruled on the cross-motions, management is unable to predict the final outcome of this litigation. However, management currently believes that the resolution of this matter will not have a material adverse impact on our financial position, results of operations or cash flows. Depending on the amount and timing, an unfavorable resolution could materially affect our future results of operations or cash flows in a particular period.

    On March 27, 2001, Jupiter Media Metrix filed suit against us and another, unaffiliated company in the United States District Court for the District of Delaware. The case is captioned, Jupiter Media Metrix, Inc. v. NetRatings, Inc. and NetValue USA, Inc. (Civil Action No. 01-CV-193). The complaint alleges infringement of U.S. Patent No. 6,115,680 and is entitled "Computer Use Meter and Analyzer." The complaint seeks unspecified compensatory and treble damages and to preliminarily and permanently enjoin the defendants from infringing the patent in the future. We have not yet filed an answer to the complaint. We intend to vigorously defend against the assertion of infringement. 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.

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

    No matters were submitted to a vote of security holders during the fourth quarter of fiscal 2000.

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PART II

ITEM 5. MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

    NetRatings' Common Stock is quoted on the Nasdaq National Market under the symbol NTRT. The following table sets forth the range of high and low closing sales prices for each period indicated and reflects all stock splits effected by the Company:

    We had approximately 133 stockholders of record as of March 6, 2001; this does not reflect persons or entities who hold their stock in nominee or "street" name through various brokerage firms. We have not declared or paid any cash dividends on our Common Stock and presently intend to retain our future earnings, if any, to fund the development and growth of our business and, therefore, do not anticipate paying any cash dividends in the foreseeable future.

ITEM 6. SELECTED FINANCIAL DATA

    The following selected financial data should be read in conjunction with the financial statements and the notes thereto included elsewhere herein.

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ITEM 7. 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 "Factors That May Affect Our Performance" and elsewhere in this Annual Report on Form 10-K. The following discussion should be read together with our financial statements and related notes thereto included elsewhere in this Annual Report on Form 10-K.

Overview

    We were incorporated in July 1997 to provide Internet audience measurement information and analysis. 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 measurement 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 the United States and in June 2000 we began providing data based on our Canadian panel.

    In June 1999, we commenced our international expansion efforts by establishing a joint venture, NetRatings Japan. NetRatings Japan is responsible for building and maintaining a Japanese audience measurement panel and introducing our products and services to the Japanese market. In March 2000, NetRatings Japan began providing data based on the Japanese audience measurement panel. As of December 31, 2000, we held a 26% direct ownership interest in NetRatings Japan, ACNielsen eRatings.com, our joint venture partner, held a 20% ownership, and the remaining ownership interest was held by various Japanese investors.

    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, ACNielsen eRatings.com, in which we held a 19.9% ownership interest as of December 31, 2000 and ACNielsen held the remaining 80.1%, we have developed and released data for Internet audience measurement panels in Australia, Brazil, Denmark, Finland, Germany, Hong Kong, Ireland, Italy, Korea, Netherlands, New Zealand, Norway, Singapore, Spain, Sweden, Taiwan, and the United Kingdom. Panels are now under development in Austria, Belgium, Israel, Mexico, South Africa, and Switzerland, and it is anticipated that these services will be rolled out before the end of 2001. As part of this joint venture, ACNielsen is responsible for the costs related to the initial development of these panels.

    In January 2000, we established a joint venture in France, Mediametrie eRatings.com, in which we held a 30% ownership interest as of December 31, 2000, ACNielsen eRatings.com held a 20% ownership interest, and Mediametrie held the remaining ownership interest. Mediametrie eRatings.com is responsible for building and maintaining a French audience measurement panel and introducing our products and services to the French market. In September 2000, Mediametrie eRatings.com began providing data based on the French audience measurement panel.

    Through our strategic relationships and our joint ventures, we now provide the Nielsen//NetRatings service in 21 countries and panel development has commenced in an additional 6 countries.

    We generate revenue from the sale of our Internet audience measurement products and services. Through December 31, 2000, our information and analytical products and services, which include our Audience Measurement services, eCommerce services, and Media and Advertising Services have

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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 a portion of our revenue from the sale of custom research services and royalty payments from our joint venture partners. Revenue from these custom services is 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 for the Nielsen//NetRatings service has increased from over 255 customers worldwide as of December 31, 1999 to more than 770 customers worldwide as of December 31, 2000.

    Cost of revenue consists primarily of expenses related to the recruitment and maintenance of our U.S. and Canadian audience measurement panels, which are expensed as they are incurred. Accordingly, such expenses are not directly related to revenue or subscriptions generated in a given period and are higher in periods in which we are involved in signifi