HARMONIC INC - Annual Report: 2012 (Form 10-K)

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2012 Annual Report

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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, 2012

Commission File No. 000-25826

HARMONIC INC.

(Exact name of Registrant as specified in its charter)

4300 North First Street

San Jose, CA 95134

(408) 542-2500

(Address, including zip code, and telephone number, including area code, of Registrant’s principal executive offices)

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

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

None

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ¨    No  x

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Exchange Act.    Yes  ¨    No  x

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 whether the Registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files).    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 the 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.    Yes  ¨    No  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Based on the closing sale price of the Common Stock on the NASDAQ Global Market on June 29, 2012, the aggregate market value of the voting Common Stock held by non-affiliates of the Registrant was approximately $422,694,000. Shares of Common Stock held by each executive 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 outstanding of the Registrant’s Common Stock, $.001 par value, was 115,202,002 on February 7, 2013.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statement for the Registrant’s 2013 Annual Meeting of Stockholders (which will be filed with the Securities and Exchange Commission within 120 days of the end of the fiscal year ended December 31, 2012) are incorporated by reference in Part III of this Annual Report on Form 10-K.

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HARMONIC INC.

FORM 10-K

TABLE OF CONTENTS

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Forward Looking Statements

Some of the statements contained in this Annual Report on Form 10-K are forward-looking statements that involve risk and uncertainties. The statements contained in this Annual Report on Form 10-K that are not purely historical are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including, without limitation, statements regarding our expectations, beliefs, intentions or strategies regarding the future. In some cases, you can identify forward-looking statements by terminology such as, “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “believes,” “intends,” “estimates,” “predicts,” “potential,” or “continue” or the negative of these terms or other comparable terminology. These forward-looking statements include, but are not limited to, statements regarding:

These statements are subject to known and unknown risks, uncertainties and other factors, which may cause our actual results to differ materially from those implied by the forward-looking statements. Important factors that may cause actual results to differ from expectations include those discussed in “Risk Factors” beginning on page 16 in this Annual Report on Form 10-K. All forward-looking statements included in this Annual Report on Form 10-K are based on information available to us on the date thereof, and we assume no obligation to update any such forward-looking statements. The terms “Harmonic,” the “Company,” “we,” “us,” “its,” and “our”, as used in this Annual Report on Form 10-K, refer to Harmonic Inc. and its subsidiaries and its predecessors as a combined entity, except where the context requires otherwise.

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PART I

OVERVIEW

We design, manufacture and sell versatile and high performance video infrastructure products and system solutions that enable our customers to efficiently create, prepare and deliver a full range of video services to consumer devices, including televisions, personal computers, tablets and mobile phones. Our revenue is derived from selling video processing and production and playout solutions and services to traditional video service providers, content owners, broadcasters and over-the-top, or OTT, video providers and selling network edge and access solutions and services to cable providers. Our products are deployed by thousands of media companies or video service providers, a growing portion of which are located outside the United States. We derived approximately 57% of our revenue from our international customers in 2012.

INDUSTRY OVERVIEW

Demand for Video Services

The delivery of television programming and Internet-based information and communication services to consumers is converging, driven by changes in consumer lifestyles, advances in technology and by changes in the regulatory and competitive environments. Viewers of video increasingly seek a more personalized and dynamic video experience that can be delivered to a variety of devices, ranging from widescreen high-definition and 3D televisions to mobile platforms, including “smart” phones and tablet computers. In part driven by the growth in video consumption devices, the demand for video content, including through Pay-TV, has also increased, putting pressure on content providers to cost-effectively produce more high-quality content and make it available on as many consumer platforms as possible. Today, there are a number of developing trends that impact the broadcasting and television business and the businesses of our customers who originate and deliver video programming. These trends distinctly impact both service providers and content providers in unique ways.

Service Provider Trends

Service providers face increasing competition for consumers of video content and are moving quickly to provide a more personalized, on-demand video experience to consumers. Consumers want to view video content at any time, from any location and on any device. Service providers face intense pressure to satisfy these demands, and they see a number of trends, including the following, driving their business:

On-Demand Services

The expanding use of digital video recorders and network-based video on demand, or VOD, services is leading to changes in the way subscribers watch television programming in the home. Subscribers are increasingly utilizing “time-shifting” technology. Further advances in technology are accelerating these trends, with cable, satellite and telecommunications (“telcos”) operators announcing initiatives, often in conjunction with network broadcasters, to increasingly personalize subscribers’ video viewing experience. Those initiatives include the delivery of programming directly to broadband enabled TV sets, tablet computers and other mobile devices, in addition to conventional TV sets.

High-Definition Television

The increasing popularity of HDTV, 3D and home theater equipment is putting competitive pressure on broadcasters and Pay-TV providers to offer higher quality video signals for such high definition services, including initiatives to deliver video in ultra high resolution formats. At the end of 2012, leading operators in the U.S. were offering hundreds of national and local HD channels to their subscribers across the country and a similar trend is continuing to grow in international markets.

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The Internet and Other Video Distribution Methods

As a competitive response to alternative video distribution models by Hulu and Netflix, as well as traditional broadcasters making their content available on-line, traditional service providers are expanding their offering to allow their customers to stream video to a range of personal video devices. These new platforms with either fixed or mobile broadband connections are rapidly gaining popularity and poised to become a major factor in the future of video. We believe that the delivery of video over internet protocol will continue to change traditional video viewing habits and distribution methods and also potentially alter the traditional subscription business model of the major Pay-TV service providers.

Pay TV in Emerging Markets

With a rapidly growing middle class across emerging markets, the Pay-TV business is poised for rapid growth over the coming decade. Consumers who are entering the middle class are now able to afford a monthly video service to gain access to their favorite sports, news and movies. Considering the early stages of economic development in many of these regions, together with the sheer scale of the population, it is conceivable that the leading video service providers in these regions will grow and could become world leaders, and, as a result, the investments they will make in their infrastructure are likely to rapidly trend upward.

Branded Content

In an attempt to differentiate their products in the competitive market, traditional service providers are looking to enhance their offerings by creating and delivering their own branded content. This transition to branded content is being accomplished either by organic in-house development of new content or acquisition of existing and well established content brands. The historic demarcation point between traditional service providers (distributors) and content owners (creators) will continue to become blurry over time.

Content Provider Trends

As the number of video consumption platforms increase and service provider competition creates more opportunities to reach consumers, content providers are facing increasing demands for more content and in many more formats. The process of producing and preparing content for multi-screen delivery means that content providers must become more efficient to keep up with demand. At the same time, content providers realize that their ownership of content rights gives them market power, with many content providers now looking at launching their own content distribution initiatives to reach consumers directly. Several important trends, including the following, are impacting content providers.

Demand for High-Quality HD Content

With service providers adding more HD channels and consumers viewing HD television content on ever-larger screens and home theater environments, the demand for more and higher-quality HD programming continues to escalate. From sports to news to episodic to movies, content providers face increasing pressure to deliver the highest quality HD programming across all types of platforms, driving an accelerating transition from standard definition to HD.

Content Format Proliferation

As service providers seek to deliver more video services to more devices and platforms, they are increasingly requiring content providers to supply content that is properly formatted for each device. With the number of devices continuing to grow, the lack of consistent video standards means that content providers must reformat and package their content in dozens of different formats so that their content is viewable across all of these different devices.

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Fragmentation of Revenue Sources

As consumers divide their viewing across a wider range of devices, the revenues associated with content correspondingly are divided across all of the different viewing outlets. While total content revenues, either from advertising or subscription fees, may remain stable or even increase, the amount of total revenue available to support any particular format or viewing platform may decrease, causing content providers to become more efficient and cost-effective in the production and packaging of their content.

Move to File-Based Workflows

From newsrooms to Hollywood studios, there has been a growing shift from traditional tape-based acquisition and production to a more file-based workflow, where video content is captured, compressed, stored and edited as a file residing in a storage system. The move to video file-based production streamlines the production process because content can be more readily shared across multiple production applications and various media processing tasks can be performed on stored content in a “faster-than-real-time” manner. These trends are driving content providers to invest in video file infrastructure that will help them produce more content, faster and more cost-effectively, with server and storage solutions that will enable them to provide content in the widest possible range of formats and at the highest possible quality.

Content Creation in Emerging Markets

With a rapidly growing middle class in emerging markets, media companies addressing these markets are aggressively investing in the creation of new content with the goal of creating strong brands and a growing loyal customer base. In addition, the sheer size of select emerging economies leads to regional content creation targeted towards localized subject matters and demands, also boosting the overall potential for rapid content creation growth.

Direct Access of Consumers

Content owners and media companies across the globe are experimenting with the notion of offering their content directly to the end consumer. Some of these efforts are in collaboration with their historic distribution partners (video service providers), such as HBO-GO, while others are in competition with those partners.

The Market Opportunity

Personalized video services, such as VOD, and the increasing amounts of high resolution content, as well as an expanding amount of over-the-top video services, pose challenges to both content producers and service providers. For content producers, the increase in high-quality video consumption across these new services requires high-performance, reliable video production, transcoding and playout infrastructure in order to support the increased workload. Existing tape-based operations are inadequate for keeping up with the fast-paced demands for new content, new channels and new formats for video content. File-based production storage, high-throughput media transformation and server-based playout enable content producers to meet these growing demands.

For service providers, providing access to all these new forms of content requires more sophisticated video processing capabilities and greater bandwidth to the home in order to deliver maximum choice and flexibility to the subscriber. In addition, the delivery of live television and downloadable content to broadband connected tablets and other mobile devices creates bandwidth constraints and network management challenges. The demand for more bandwidth-intensive video, voice and data content has strained existing communications networks, especially where video is received and processed, and in the “last mile” of the communications infrastructure, where homes connect to the local network. The upgrade and extension of existing processing capabilities and distribution networks, or the construction of completely new environments to facilitate the processing and

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delivery of high-speed broadband video, voice and data services, requires substantial expenditures and often the replacement of significant portions of the existing infrastructure. As a result, service providers are seeking solutions that maximize the efficiency of existing available bandwidth and cost-effectively manage and transport digital traffic within networks, while minimizing the need to construct new networks for the distribution of video, voice and data content.

Competition and Deregulation

Competition for traditional service providers in the cable and satellite markets has intensified as offerings from new entrants, such as telcos and OTT providers, are beginning to attract customers. This increasingly competitive environment may lead to higher capital spending by some of the market participants, particularly internationally, in an effort to deploy attractive service offerings, to capture and retain high revenue-generating subscribers, and to increase overall average revenue per user, or ARPU from the existing customer base. While global economic trends were volatile throughout 2012, particularly in Europe, this competitive dynamic appears to be continuing.

Similar competitive factors and the continued liberalization of the regulatory environment in foreign countries have led to the establishment abroad of new or expanded businesses providing video services, either in distribution of content, creation of content or both. We believe this trend is likely to increase due to growing disposable incomes and favorable macro economic trends in some foreign countries.

Our Cable Market

To address increasing competition, reduce loss of customers, increase ARPU and differentiate themselves, cable operators have embarked on several initiatives to improve their product offerings:

To support this rapid expansion of service offerings, cable operators are investing in digital video equipment that can receive, process and distribute content from a variety of sources to a growing number of consumer devices, video storage equipment and servers to ingest, store and intelligently distribute increasing amounts of content, complemented by edge devices capable of routing, multiplexing and modulating in order to deliver signals to individual subscribers over a hybrid fiber-coaxial, or HFC, network.

Our Satellite Market

Over 100 satellite operators around the world have established digital television services that serve tens of millions of subscribers. These services are capable of providing tens of thousands of channels, including an increasing number of high definition channels. These linear services will likely continue to expand as operators offer premium packages targeted towards specific consumer groups, with the goal of gaining loyalty and

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expanding ARPU. In parallel, satellite operators have began offering the same linear services and VOD options to their customer base via broadband connected consumer devices such as smart phones, tablets and their own set-top boxes. These services are deployed in conjunction with content delivery networks (“CDNs”) and are accessible through partnerships, acquisitions or internal investments. To support much of these new services, satellite operators are considering an upgrade to their video infrastructure in order to provide a dual gain of bandwidth efficiency and operational optimization in an increasingly complex environment.

Internationally, and specifically in emerging markets, satellite operators have continued to enjoy substantial growth in their customer base, driven mainly by rapid economic development, which has resulted in a significantly growing middle class with disposable income. As this growth continues, it is expected that these satellite operators will expand their product offerings in an effort to leverage the growing customer base and increase overall revenue.

Our Telco Market

Over the past several years, telcos around the world have added video services as a competitive response to cable and satellite operators and as a potential source of revenue growth. As their businesses have grown and matured, they have also expanded their offerings in an effort to successfully compete in the video arena, including premium quality HD and 3D content, larger on-demand libraries, time-shift television services, bundled packages, multi-screen offerings to smart phones and tablets and branded mobile specific services. The last of these offerings is a key advantage they enjoy today, creating a clear differentiator in any-time, anywhere service offerings, as well as a rich library option for consumers looking to view content on the move.

Our Terrestrial Market

In the terrestrial broadcasting market, operators in many countries in Europe, Asia Pacific, Africa and South America are now required by regulation to convert from analog to digital transmission in order to free up broadcast spectrum. The conversion to digital transmission often provides the opportunity to deliver new channels, HD services, premium content and interactive services. These broadcasters are faced with requirements of converting analog signals to digital signals prior to transmission over the air, as well as to distribute these new signals across a new terrestrial network.

Our Broadcast and Media Markets

Network broadcasters, programmers and content owners need to transmit live programming of news and sports to their studios, to subsequently broadcast their content, and to deliver their content to video service providers for distribution to their subscribers. These broadcasters generally produce their own news and sports highlight content, along with hundreds of channels of network programming that is played to air under strict reliability requirements. With our acquisition of Omneon in 2010, the broadcast and media market has grown to become our second largest market, representing approximately 32% of our revenue in 2012.

To successfully service consumers’ demands, media companies are expanding their offerings to support both a wide range of live/linear content, and to make the content available in an on-demand manner. As a result, their transition towards automated file based workflows have accelerated and, accordingly, so have their needs for media servers, video optimized storage and transformation video products. In addition, and in an effort to optimize their operations, distribution networks responsible for moving content to the service providers are being upgraded to handle larger volumes of content in more efficient formats and with greater flexibility.

Other Markets

We are addressing video processing and content creation opportunities with a variety of new video entrants, some of which distribute video via traditional television channels or over-the-top and many of which use both methods of distribution.

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Current Industry Conditions

Many of our customers, particularly our international customers in geographies other than Europe, appeared to have increased their capital expenditures in 2011 and 2012, compared to 2009 and 2010, and it is possible that the trends described in the previous sections above may continue to drive capital investments in 2013, particularly in emerging markets. We expect capital spending by many of our international customers to continue at 2012 levels, or increase, in 2013, and that capital spending by our U.S. customers may remain flat in 2013. Nevertheless, the global economic instability that exists today, particularly in Europe, and the potential worldwide adverse impact of that instability pose a significant risk that such expectation will not be met, as such instability may result in a tougher economic environment for our customers to access credit and to broaden their capital investments.

PRODUCTS

Our products generally fall into three principal categories; video production platforms and playout solutions, video processing solutions and edge and access products. We also provide technical support services and professional services to our customers worldwide. Our video production platforms consist of video-optimized storage and content management applications that provide content companies with file-based infrastructure to support video content production activities, such as editing, post-production and finishing. Our playout solutions are based on scalable video servers used by content owners and multi-channel operators for assembly and playout of one or more television channels. Our video processing solutions, which include network management software and application software products, provide broadband operators with the ability to acquire a variety of signals from different sources and in different protocols in order to deliver a variety of real-time and stored content to their subscribers. Many of our customers also use these products to organize, manage and distribute content in ways that maximize use of the available bandwidth. Our edge products enable cable operators to deliver customized broadcast or narrowcast on-demand and data services to their subscribers. Our access products, which consist mainly of optical transmission products, node platforms and return path products, allow cable operators to deliver video, data and voice services over their distribution networks.

Video Production Platforms and Playout Solutions

Video servers. The Spectrum and MediaDeck video server products are used by broadcasters, content owners and multi-channel network operators to create and play-to-air television channels. Our servers support both standard and high definition programming, as well as many different media formats, such as MPEG-2, MEPG-4, DV and AVC-Intra, using both QuickTime and MXF media wrapper formats. Typically our customers use our servers to record incoming content from either live feeds or from tapes, encoding that content in real-time into standard media files that are stored in the server’s file system until the content is needed for playback as part of a scheduled playlist. Clips stored in the server are decoded in real-time and played to air according to a playout schedule in a frame-accurate, back-to-back manner to create a seamless television channel.

Video-optimized storage. The MediaGrid active storage system is a scale-out, network-attached storage system with a built-in media file system that has been optimized for typical read and write file operations found in media production workflows. Architected as a clustered storage system with a distributed file system, MediaGrid provides highly scalable storage capacity and access bandwidth to support demanding media production applications, such as video editing, content transformation and media library management.

Media Applications. Complementing our server and storage platforms, our Media Application Server or MAS, combined with a suite of integrated applications, including ProXplore, ProBrowse and ProXchange, provides a basic level of integrated media management and workflow control over content stored across our systems. For more complex media management, our underlying API, called Media Services Framework, allow both customers and other application developers to build advanced media management applications that can automate many media processing and movement tasks, collect and organize content metadata, and provide search and review functionality.

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Video Processing Solutions

Broadcast encoders. Our Electra and Ion high performance encoders compress video, audio and data channels to low bit rates, while maintaining high video quality. Our encoders are available in standard and high definition formats in both MPEG-2, and the newer MPEG-4 AVC/H.264, or MPEG-4, video compression standards, for both televisions and new multi-screen formats targeted at smart phones, tablets and broadband connected TVs. Our Electra 9000 encoder supports all of these formats on the same hardware platform. Most of these encoders are used in real-time linear video applications, but they are also employed in conjunction with our software in encoding of video content and storage for later delivery as VOD and time-shifted services.

Contribution and distribution encoders. Our Ellipse encoders provide broadcasters with video compression solutions for on-the-spot news gathering, live sports coverage and other remote events. These products enable our customers to deliver these feeds to their studios for further processing. Broadcasters and other operators, such as teleports, also use these encoders for delivery of their programming to their customers, typically cable, telco and satellite operators.

Stream processing and statistical multiplexing solutions. Our ProStream platform and other stream processing products offer our customers a variety of capabilities that enable them to manage and organize digital streams in a format best suited to their particular delivery requirements and subscriber offerings. Our multi-function ProStream 1000 addresses multiplexing, encryption, ad insertion and other advanced processing requirements of MPEG video streams and can be integrated with our DiviTrackIP statistical multiplexer, which enhances the bandwidth efficiency of our encoders by allowing bandwidth to be dynamically allocated according to the complexity of the video content. DiviTrackIP also enables operators to combine inputs from different physical locations into a single multiplex.

Content preparation and delivery for multi-screen applications. We offer a variety of content preparation, storage and delivery software based solutions that enable high-quality broadcast and on-demand video services on any device (TV, PC or mobile). Our ProMedia family of products provide live-based transcoding, packaging and time-shifting, file-based transcoding and workflow management solutions to facilitate content preparation in any format. Our MediaGrid active storage system provides scalable, high performance network-attached storage to store growing libraries of content. Our multi-screen solutions are used for a variety of applications, including live streaming, VOD, catch-up TV, start-over TV, network PVR through HTTP streaming and multi-bitrate adaptive HTTP streaming.

Decoders and descramblers. We provide our ProView integrated receivers-decoders to allow service providers to acquire content delivered via satellite, IP or terrestrial networks for distribution to their subscribers. These products are also used to decode signals backhauled from live news and sporting events in contribution applications and, more recently, are used by content owners looking to distribute their content in a controlled manner to a large base of video service providers.

Management and control software. Our NMX Digital Service Manager gives service providers the ability to control and visually monitor their digital video infrastructure at an aggregate level, rather than as just discrete pieces of hardware, thereby reducing their operational costs. Our NETWatch management system operates in broadband networks to capture measurement data and our software enables the broadband service operator to monitor and control the HFC transmission network from a master headend or remote locations. Our NMX Digital Service Manager and NETWatch software is designed to be integrated into larger network management systems through the use of simple network management protocol, or SNMP.

Edge and Access Products

Edge products. Our Narrowcast Services Gateway family, or NSG, is a fully integrated edge gateway that integrates routing, multiplexing, scrambling and modulation into a single package for the delivery of narrowcast services to subscribers over cable networks. An NSG is usually supplied with single Gigabit Ethernet inputs or

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multiple Gigabit Ethernet inputs, allowing the cable operator to use bandwidth efficiently by delivering IP signals from the headend to the edge of the network for subsequent modulation onto the HFC network. Originally developed for VOD applications, our most recent NSG product, the high-density, multi-function NSG 9000, may also be used in switched digital video and modular Cable Modem Termination Systems, or M-CMTS, applications, as well as large-scale VOD deployments.

Optical transmitters and amplifiers. Our family of optical transmitters and amplifiers operates at various optical wavelengths and serves both long-haul and local transport applications in the cable distribution network. The PWRLink series provides optical transmission primarily at a headend or hub for local distribution to optical nodes and for narrowcasting, which is the transmission of programming to a select set of subscribers. Our METROLink Dense Wave Division Multiplexing, or DWDM, system allows operators to expand the capacity of a single strand of fiber and to provide narrowcast services directly from the headend to nodes. We also offer SupraLink, a transmitter that allows deeper deployment of optical nodes in the network and minimizes the significant capital and labor expense associated with deploying additional optical fiber.

Optical nodes and return path equipment. Our family of PWRBlazer optical nodes supports network architectures that meet the varying demands for bandwidth delivered to a service area. By the addition of modules providing functions such as return path transmission and DWDM, our configurable nodes are easily segmented to handle increasing two-way traffic over a fiber network without major reconstruction or replacement of our customers’ networks. Our return path transmitters support two-way transmission capabilities by sending video, voice and data signals from the optical node back to the headend. These transmitters are available for either analog or digital transport.

Technical Support and Professional Services

We provide maintenance and support services to most of our customers under service level agreements that are generally renewed on an annual basis. We also provide consulting, implementation and integration services to our customers worldwide. We draw upon our expertise in broadcast television, communications networking and compression technology to design, integrate and install complete solutions for our customers, including integration with third-party products and services. We offer a broad range of services, including program management, technical design and planning, parts inventory management, building and site preparation, integration and equipment installation, end-to-end system testing and comprehensive training.

CUSTOMERS

We sell our products to a variety of cable, satellite and telco, and broadcast and media companies. Set forth below is a representative list of our significant end user and integrator/distributor customers, based, in part, on revenue during 2012.

Historically, a majority of our revenue has been derived from relatively few customers, due in part to the consolidation of the ownership of cable television and direct broadcast satellite system companies. However, in

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the last few years, revenue from our ten largest customers has decreased as a percentage of revenue, due to our growing customer base, in part as a result of the acquisition of Scopus in 2009 and Omneon in 2010. Sales to our ten largest customers in 2012, 2011 and 2010 accounted for approximately 33%, 35% and 44% of revenue, respectively. Although we are attempting to broaden our customer base by penetrating new markets and further expanding internationally, we expect to see continuing industry consolidation and customer concentration.

During 2012, 2011 and 2010, revenue from Comcast accounted for 12%, 11% and 17% respectively, of our revenue. The loss of Comcast or any other significant customer, any material reduction in orders by Comcast or any significant customer, or our failure to qualify our new products with a significant customer could materially and adversely affect our operating results, financial condition and cash flows. In addition, we are involved in most quarters in one or more relatively large individual transactions, including, from time to time, projects in which we act much like a systems integrator. A decrease in the number of relatively larger individual transactions in which we are involved in any quarter could adversely affect our operating results for that quarter.

SALES AND MARKETING

In the U.S. we sell our products through our own direct sales force, as well as through independent distributors and integrators. Our direct sales team is organized geographically and by major customers and markets to support customer requirements. We sell to international customers through our own direct sales force, as well as through independent distributors and integrators. Our principal sales offices outside of the U.S. are located in Europe and Asia, and we have a support center in Switzerland to support our international customers. International distributors are generally responsible for importing our products and providing certain installation, technical support and other services to customers in their territory. Our direct sales force and distributors are supported by a highly trained technical staff, which includes application engineers who work closely with operators to develop technical proposals and design systems to optimize system performance and economic benefits to operators. Technical support provides a customized set of services, as required, for ongoing maintenance, support-on-demand and training for our customers and distributors, both in our facilities and on-site.

Our marketing organization develops strategies for product lines and markets and, in conjunction with our sales force, identifies the evolving technical and application needs of customers so that our product development resources can be most effectively and efficiently deployed to meet anticipated product requirements. Our marketing organization is also responsible for setting price levels, demand forecasting and general support of the sales force, particularly at major accounts. We have many programs in place to heighten industry awareness of our products, including participation in technical conferences, publication of articles in industry journals and exhibitions at trade shows.

MANUFACTURING AND SUPPLIERS

We use third party contract manufacturers extensively to assemble our products and a substantial majority of subassemblies and modules for our products. Our reliance on subcontractors involves several risks, and we may not be able to obtain an adequate supply of components, subassemblies, modules and turnkey systems on a timely basis. In 2003, we entered into an agreement with Plexus Services Corp. to act as our primary contract manufacturer. Plexus currently provides us with a substantial majority, by dollar amount, of the products we purchase from our contract manufacturers. This agreement has automatic annual renewals, unless prior notice is given, and has been automatically renewed until October 2013. We do not generally maintain long-term agreements with any of our contract manufacturers.

Our internal manufacturing operations consist primarily of final assembly and testing of fiber optic systems. These processes are performed by highly trained personnel, employing technologically advanced electronic equipment and proprietary test programs. The manufacturing of our products and subassemblies is a complex process, and we cannot be sure that we will not experience production problems or manufacturing delays in the

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future. Because we utilize our own manufacturing facilities for the final assembly and test of our fiber optic systems, and because such manufacturing capabilities are not readily available from third parties, any interruption in our manufacturing operations could materially and adversely affect our business, operating results, financial position and cash flows.

Many components, subassemblies and modules necessary for the manufacture or integration of our products are obtained from a sole supplier or a limited group of suppliers. For example, we are dependent on one company for certain video encoding chips that are incorporated into several of our products.

Our reliance on sole or limited suppliers, particularly foreign suppliers, involves several risks, including a potential inability to obtain an adequate supply of required components, subassemblies or modules and reduced control over pricing, quality and timely delivery of components, subassemblies or modules for a number of reasons, including as a result of the impact of natural disasters on those suppliers. In particular, certain components have in the past been in short supply and are available only from a small number of suppliers or from sole source suppliers. While we expend considerable efforts to qualify additional component sources, consolidation of suppliers in the industry and the small number of viable alternatives have limited the results of these efforts. We do not generally maintain long-term agreements with any of our suppliers.

Managing our supplier relationships is particularly difficult during time periods in which we introduce new products or in which demand for our products is increasing, especially if demand increases more quickly than we expect. An inability to obtain adequate and timely deliveries, or any other circumstance that would require us to seek alternative sources of supply, could affect our ability to ship our products on a timely basis, which could damage relationships with current and prospective customers and harm our business. We attempt to limit this risk by maintaining inventories of certain components, subassemblies and modules and through our demand order fulfillment system. As a result of this investment in inventories, we have in the past been, and in the future may be, subject to a risk of excess and obsolete inventories, which could adversely affect our business and operating results.

INTELLECTUAL PROPERTY

As of December 31, 2012, we held 59 issued U.S. patents and 22 issued foreign patents and had a number of patent applications pending. Although we attempt to protect our intellectual property rights through patents, trademarks, copyrights, licensing arrangements, maintaining certain technology as trade secrets and other measures, we cannot assure you that any patent, trademark, copyright or other intellectual property rights owned by us will not be invalidated, circumvented or challenged, that such intellectual property rights will provide competitive advantages to us, or that any of our pending or future patent applications will be issued with the claims, or the scope of the claims, sought by us, if at all. For example, in October 2011 and June 2012, Avid Technologies, Inc. sued us for patent infringement, alleging, in the first action, that our MediaGrid product infringes two patents held by Avid and, in the second action, that our Spectrum product infringes one patent held by Avid. We cannot assure you that others will not develop technologies that are similar or superior to our technology, duplicate our technology or design around the patents that we own. In addition, effective patent, copyright and trade secret protection may be unavailable or limited in certain foreign countries in which we do business or may do business in the future.

We generally enter into confidentiality or license agreements with our employees, consultants, vendors and customers as needed, and generally limit access to, and distribution of, our proprietary information. However, no assurances can be given that these actions will prevent misappropriation of our technology. In addition, if necessary, we are prepared to take legal action, in the future, to enforce our patents and other intellectual property rights, to protect our trade secrets, to determine the validity and scope of the proprietary rights of others, or to defend against claims of infringement or invalidity. Any such litigation could result in substantial costs and diversion of resources, including management time, and could negatively affect our business, operating results, financial position and cash flows.

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In order to successfully develop and market our products, we may be required to enter into technology development or licensing agreements with third parties. Although many companies are often willing to enter into such technology development or licensing agreements, we cannot assure you that such agreements can be negotiated on reasonable terms or at all. The failure to enter into technology development or licensing agreements, when necessary, could limit our ability to develop and market new products and could harm our business.

The markets we address are characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. In particular, leading companies in the telecommunications industry, as well as an increasing number of companies whose principal business is the ownership and exploitation of patents, have extensive patent portfolios. From time to time, third parties, including certain of these companies, have asserted, and may in the future assert, exclusive patent, copyright, trademark and other intellectual property rights against us or our customers. There can be no assurance that we will be able to defend against any claim that we are infringing upon their intellectual property rights, that the terms of any license offered by any person asserting such rights would be acceptable to us or our customers, or that failure to obtain a license or the costs associated with any license would not materially and adversely affect our business, operating results, financial position and cash flows.

BACKLOG

We schedule production of our products and solutions based upon our backlog, open contracts, informal commitments from customers and sales projections. Our backlog consists of firm purchase orders by customers for delivery within the next twelve months, as well as deferred revenue that is expected to be recognized within the succeeding twelve months. At December 31, 2012, backlog, including deferred revenue, was $132 million, compared to $125 million at December 31, 2011. The increase in backlog at December 31, 2012, from December 31, 2011, was due to an increase in orders received under which product shipments had not been made. Delivery schedules on such orders may be deferred or canceled for a number of reasons, including reductions in capital spending by our customers or changes in specific customer requirements. In addition, due to annual capital spending budget cycles at many of our customers, our backlog at December 31, 2012, or any other date, is not necessarily indicative of actual sales for any succeeding period.

COMPETITION

The markets for video infrastructure systems are extremely competitive and have been characterized by rapid technological change and declining average selling prices. The principal competitive factors in these markets include product performance, reliability, price, breadth of product offerings, network management capabilities, sales and distribution capabilities, technical support and service, and relationships with network operators. We believe that we compete favorably in each of these categories. Our competitors in digital video solutions include vertically integrated system suppliers, such as Motorola, Cisco Systems, Ericsson and Thomson Video Networks, and, in certain product lines, a number of smaller companies, including Envivio, RGB Networks and Elemental. In production and playout products, competitors include Harris (now The Gores Group), Grass Valley, Miranda and Avid. In edge devices and fiber optic access products, competitors include Motorola Mobility (acquired by Google in 2012), Cisco Systems, Aurora and Arris.

Consolidation in the industry has led to the acquisition of several of our historic competitor companies. For example, Scientific Atlanta, Tandberg Television, and BigBand Networks and C-Cor were acquired by Cisco Systems, Ericsson and Arris, respectively. Further, Arris recently announced that it would be acquiring Motorola Home from Google’s Motorola Mobility unit. Consequently, most of our principal competitors are substantially larger and have greater financial, technical, marketing and other resources than we have. Many of these larger organizations are in a better position to withstand any significant reduction in capital spending by customers in these markets and are often more capable of engaging in price-based competition for sales of products. They often have broader product lines and market focus, and, therefore, will not be as susceptible to downturns in a

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particular market. In addition, many of our competitors have been in operation longer than we have and have more long-standing and established relationships with domestic and foreign customers. Further, a few of our competitors offer long-term lease financing to customers for products competitive with ours. We may not be able to compete successfully in the future and competition may harm our business, operating results, financial position and cash flows.

If any of our competitors’ products or technologies were to become the industry standard, our business could be seriously harmed. In addition, companies that have historically not had a large presence in the broadband communications equipment market have expanded their market presence through mergers and acquisitions. Further, our competitors may bundle their products or incorporate functionality into existing products in a manner that discourages users from purchasing our products or which may require us to lower our selling prices, which could adversely affect our revenue and result in lower gross margins.

RESEARCH AND DEVELOPMENT

We have historically devoted a significant amount of our resources to research and development. Research and development expenses in 2012, 2011, and 2010 were $106.2 million, $102.7 million and $77.2 million, respectively. Our internal research and development activities are conducted primarily in the United States (California, Oregon, New York and New Jersey), Israel and Hong Kong.

Our research and development program is primarily focused on developing new products and systems, and adding new features to existing products and systems. Our development strategy is to identify features, products and systems, in both software and hardware solutions, that are, or are expected to be, needed by our customers. Our current research and development efforts are focused heavily on video processing solutions, including enhanced video compression and multi-screen solutions. We also devote significant resources to production and playout and distribution solutions. Other research and development efforts are devoted to edge QAM devices for both video and data, and broadband optical products that enable the transmission of video over fiber optic networks.

Our success in designing, developing, manufacturing and selling new or enhanced products will depend on a variety of factors, including the identification of market demand for new products, product selection, timely implementation of product design and development, product performance, effective manufacturing and assembly processes and sales and marketing. Because of the complexity inherent in such research and development efforts, we cannot assure you that we will successfully develop new products, or that new products developed by us will achieve market acceptance. Our failure to successfully develop and introduce new products would materially and adversely affect our business, operating results, financial condition and cash flows.

EMPLOYEES

As of December 31, 2012, we employed a total of 1,148 people, including 439 in research and development, 223 in sales, 179 in service and support, 145 in operations, 57 in marketing (corporate and product), and 105 in a general and administrative capacity. There were 660 employees in the U.S. and 488 employees in foreign countries located in South America, the Middle East, Europe, Asia, and Canada. We also employ a number of temporary employees and consultants on a contract basis. None of our employees are represented by a labor union with respect to his or her employment by Harmonic. We have not experienced any work stoppages, and we consider our relations with our employees to be good. Our future success will depend, in part, upon our ability to attract and retain qualified personnel. Competition for qualified personnel in the broadband communications industry and in the geographic areas where our primary operations are located remains strong, particularly for highly qualified technical personnel, and we cannot assure you that we will be successful in retaining our key employees or that we will be able to attract the key employees or highly qualified technical personnel we may require in the future.

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ABOUT HARMONIC

Harmonic was initially incorporated in California in June 1988 and reincorporated into Delaware in May 1995.

In March 2009, we completed the acquisition of Scopus Video Networks, Ltd. The acquisition of Scopus was intended to strengthen our position in international video broadcast and contribution and distribution markets. Scopus provides complementary video processing technology, expanded research and development capability and additional sales and distribution channels, particularly in emerging markets.

In September 2010, we completed the acquisition of Omneon, Inc., a private, venture-backed company specializing in file-based infrastructure for the production, preparation and playout of video content typically deployed by broadcasters, satellite operators, content owners and other media companies. The acquisition of Omneon is complementary to our core business, expanding our customer reach into content providers and extending our product lines into video servers and video-optimized storage for content production and playout.

Our principal executive offices are located at 4300 North First Street, San Jose, California 95134. Our telephone number is (408) 542-2500. Our Internet website is http://www.harmonicinc.com. Other than the information expressly set forth in this Annual Report on Form 10-K, the information contained or referred to on our web site is not part of this report.

We depend on cable, satellite and telco, and broadcast and media industry capital spending for our revenue and any material decrease or delay in capital spending in any of these industries would negatively impact our operating results, financial condition and cash flows.

Our revenue has been derived from sales to cable television operators, satellite and telco operators and broadcast and media companies, as well as, more recently, emerging streaming media providers. We expect that these markets will provide our revenue for the foreseeable future. Demand for our products will depend on the magnitude and timing of capital spending by customers in each of these markets for the purpose of creating, expanding or upgrading their systems.

These capital spending patterns are dependent on a variety of factors, including:

In the past, specific factors contributing to reduced capital spending have included:

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In the past, adverse economic conditions in one or more of the geographies in which we offer our products have adversely affected our customers’ capital spending in those geographies and, as a result, our business. In 2008, 2009 and the first half of 2010, economic conditions in many of the geographies in which we offer our products were very weak, and global economic conditions and financial markets experienced a severe downturn. The downturn stemmed from a multitude of factors, including adverse credit conditions, slower economic activity, concerns about inflation and deflation, rapid changes in foreign exchange rates, increased energy costs, decreased consumer confidence, reduced corporate profits and capital spending, adverse business conditions and liquidity concerns. Although there was an increase in global economic activity in the second half of 2010 and the first half of 2011, economic growth appears to have become sluggish in some geographies since the middle of 2011, and weak in other geographies, particularly in Europe, since the beginning of 2012. Further, economic growth is expected to be sluggish in some geographies, and may continue to be weak in Europe, during 2013.

The severity or length of time that economic and financial market conditions may be weak or sluggish, whether certain or all of such adverse factors will persist, or whether a severe down turn may occur in the U.S., Europe or in other geographies, is unknown. During challenging or uncertain economic times, and particularly in tight credit markets, many customers may delay or reduce capital expenditures, which often results in lower demand for our products.

Further, we have a number of international customers to whom sales are denominated in U.S. dollars. The value of the U.S. dollar fluctuates significantly against many foreign currencies, including the Euro and other local currencies of many of our international customers. If the U.S. dollar appreciates relative to the local currencies of our customers, then the prices of our products correspondingly increase for such customers. Such an effect could adversely impact sales of our products to such customers and result in longer sales cycles, difficulties in collection of accounts receivable, slower adoption of new technologies and increased price competition in the affected countries. Also, if the U.S. dollar were to weaken against many foreign currencies, there can be no assurance that a weaker dollar would lead to growth in capital spending.

In addition, industry consolidation has in the past constrained, and may in the future constrain, capital spending by our customers. Further, if our product portfolio and product development plans do not position us well to capture an increased portion of the capital spending of customers in the markets on which we focus, our revenue may decline.

As a result of these capital spending issues, we may not be able to maintain or increase our revenue in the future, and our operating results, financial condition and cash flows could be materially and adversely affected.

The markets in which we operate are intensely competitive.

The markets for our products are extremely competitive and have been characterized by rapid technological change and declining average sales prices in the past. Pressure on average sales prices was particularly severe during previous economic downturns, including in 2008 and 2009, as equipment suppliers competed aggressively for customers’ reduced capital spending, and we experienced similar pressure during the economic slowdown in the second half of 2011 and in 2012.

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In the digital video solutions market, we compete broadly with products from vertically integrated system suppliers, including Motorola, Cisco Systems, Ericsson, and Thomson Video Networks and, in certain product lines, with a number of smaller companies. Our principal competitors for our production and playout products are Harris (now The Gores Group), Grass Valley, Miranda and Avid. Our principal competitors for edge and access products are Cisco Systems, Motorola Mobility (acquired by Google in 2012), Aurora and Arris.

Many of our competitors are substantially larger, and have greater financial, technical, marketing and other resources than we have. Many of these large enterprises are in a better position to withstand any significant reduction in capital spending by customers in our markets. They often have broader product lines and market focus, and may not be as susceptible to downturns in a particular market. These competitors may also be able to bundle their products together to meet the needs of a particular customer, and may be capable of delivering more complete solutions than we are able to provide. To the extent large enterprises that currently do not compete directly with us choose to enter our markets by acquisition or otherwise, competition would likely intensify.

Further, some of our competitors that have greater financial resources have offered, and in the future may offer, their products at lower prices than we offer for our competing products or on more attractive financing or payment terms, which has in the past caused, and may in the future cause, us to lose sales opportunities and the resulting revenue or to reduce our prices in response to that competition. Reductions in prices for any of our products could materially and adversely affect our operating margins and revenue. In addition, many of our competitors have been in operation longer than we have and, therefore, have more long-standing and established relationships with domestic and foreign customers, making it difficult for us to sell to those customers.

If any of our competitors’ products or technologies were to become the industry standard, our business would be seriously harmed. If our competitors are successful in bringing their products to market earlier than us, or if these products are more technologically capable than ours, our revenue could be materially and adversely affected. In addition, certain companies that have not had a large presence in the broadband communications equipment market have begun to expand their presence in this market through mergers and acquisitions. The continued consolidation of our competitors could have a significant negative impact on our business. Further, our competitors, particularly companies that offer products that are competitive with our digital video systems, may bundle their products or incorporate functionality into existing products in a manner that discourages users from purchasing our products or which may require us to lower our selling prices, resulting in lower revenue and decreased gross margins.

If we are unable to compete at the same level as we have in the past, in any of our markets, or are forced to reduce the prices of our products in order to continue to be competitive, our operating results, financial condition and cash flows would be materially and adversely affected.

We need to develop and introduce new and enhanced products in a timely manner to meet the needs of our customers and to remain competitive.

All of the markets we address are characterized by continuing technological advancement, changes in customer requirements and evolving industry standards. To compete successfully, we must continually design, develop, manufacture and sell new or enhanced products that provide increasingly higher levels of performance and reliability and meet our customers changing needs. However, we may not be successful in those efforts if, among other things, our products:

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We are currently developing and marketing products based on established video compression standards, such as MPEG-4 AVC/H.264, which provides significantly greater compression efficiency, thereby making more bandwidth available to operators. We are also involved in research and development efforts with respect to products utilizing new technologies, such as high efficiency video coding, or “HEVC”. At the same time, we need to devote development resources to the existing MPEG-2 standard that many of our customers continue to require. There can be no assurance that these efforts will be successful in the near future, or at all, or that our competitors will not take significant market share in encoding or transcoding.

In order to attempt to meet fast paced, dynamic, evolving standards and customer requirements, we are intensifying our development efforts on products that will facilitate and enhance multi-screen applications, on media (“playout”) servers utilizing integrated channel playout, and on converged cable access platform (“CCAP”) products that are intended to address customers’ cost reduction efforts through the use of IP technology. Many of these products are intended to integrate existing and new features and functions in response to shifts in customer demands in the relevant market. The success of these significant and costly development efforts will be predicated, in substantial part, on the timing of market adoption of the new standards on which the resulting products are based. If any of the new standards are not adopted or such adoption is earlier or later than we are predicting, we risk spending research and development time and dollars on products that may never achieve market acceptance or introducing products that miss the customer demand window and thus do not produce the revenue that a timely introduction would have likely produced.

In order to successfully develop and market certain of our planned products, we may be required to enter into technology development or licensing agreements with third parties. We cannot provide assurances that we will be able to timely enter into any necessary technology development or licensing agreements on reasonable terms, or at all.

If we fail to develop and market new and enhanced products, our operating results, financial condition and cash flows could be materially and adversely affected.

Conditions and changes in some national and global economic environments may adversely affect our business and financial results.

Adverse economic conditions in geographic markets in which we operate may harm our business. As described in the first risk factor in this section, economic conditions in some countries in which we sell products were weak in 2008, 2009, the first half of 2010, the second half of 2011, and 2012. That weakness was principally the result of global financial markets having experienced a severe downturn, stemming from a multitude of factors, including adverse credit conditions, slower economic activity, concerns about inflation and deflation, rapid changes in foreign exchange rates, increased energy costs, decreased consumer confidence, reduced corporate profits and capital spending, adverse business conditions and liquidity concerns. Global or regional economic slowdowns have led many of our affected customers to decrease their expenditures and caused certain of our customers to reduce or delay orders for our products. Many of our international customers have been exposed to tight credit markets and depreciating currencies, further restricting their ability to build, expand or upgrade their networks. Some customers have had difficulty in servicing or retiring existing debt, and the financial constraints on certain international customers have, in the past, required us to significantly increase our allowance for doubtful accounts. It is possible that adverse economic conditions may return during 2013, on a regional or global basis, and it appears that weak economic conditions that reoccurred in most countries in Europe in the second half of 2011 and in 2012, principally as a result of the European sovereign debt crisis, may continue in 2013.

Beginning in the second quarter of 2011, the possible inability of some developed countries, including Greece, Italy, Ireland, Portugal and Spain, to meet their debt payment obligations has put substantial strain, both direct and indirect, on economic conditions in those countries, in Europe and in many other parts of the world, including the U.S. If one or more of the Euro-zone countries were to default on its sovereign debt, the adverse impact on European and other economies, including the U.S., could be severe. Further, the lowering of the

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U.S. government’s credit rating in 2011 had an adverse affect on U.S. and international financial markets. Any further lowering of that credit rating, whether as a result of the U.S. government failing to timely increase its debt limit or to take steps to reduce its deficit, or the impact of the U.S. government forced reductions in spending due to sequestration, may have a material and adverse affect on the U.S. economy, and possibly the economies of most, if not all, of the other countries in the world. The impact of any of these issues, which appears to have negatively affected Europe in the second half of 2011 and in 2012 and may continue to negatively affect Europe during 2013, could have a material adverse effect on our business, operating results, financial condition and cash flows.

During challenging economic times, and in tight credit markets, many customers may delay or reduce capital expenditures. This could result in reductions in revenue of our products, longer sales cycles, difficulties in collection of accounts receivable, slower adoption of new technologies and increased price competition. If global economic and market conditions, or economic conditions in the U.S., Europe or other key markets, deteriorate, we could experience a material and adverse effect on our business, results of operations, financial condition and cash flows.

Our customer base is concentrated and we are regularly involved in relatively large transactions. The loss of one or more of our key customers, a failure to diversify our customer base, or a decrease in the number of such larger transactions could harm our business.

Historically, a majority of our revenue has been derived from relatively few customers, due in part to the consolidation of the ownership of cable television and direct broadcast satellite system companies. Over the last three fiscal years and particularly in 2012, revenue from our ten largest customers decreased as a percentage of revenue, due to our growing customer base, in part as a result of the acquisitions of Scopus and Omneon. Nevertheless, sales to our ten largest customers in the fiscal years ended December 31, 2012, 2011 and 2010, accounted for approximately 33%, 35% and 44% of revenue, respectively. Although we are attempting to broaden our customer base by penetrating new markets and further expanding internationally, we expect to see continuing industry consolidation and customer concentration.

In the fiscal years ended December 31, 2012, 2011 and 2010, revenue from Comcast accounted for approximately 12%, 11% and 17%, respectively, of our revenue. The loss of Comcast or any other significant customer, any material reduction in orders by Comcast or any significant customer, or our failure to qualify our new products with a significant customer could materially and adversely affect, either long term or in a particular quarter, our operating results, financial condition and cash flows. In addition, we are involved in most quarters in one or more relatively large individual transactions, including, from time to time, projects in which we act much like a systems integrator. A decrease in the number of the relatively larger individual transactions in which we are involved in any quarter could adversely affect our operating results for that quarter.

As a result of these and other factors, we may be unable to increase our revenues from some or all of the markets we address, or to do so profitably, and any failure to increase revenues and profits from these customers could materially and adversely affect our operating results, financial condition and cash flows.

We depend significantly on our international revenue and are subject to the risks associated with international operations, which may negatively affect our operating results.

Revenue derived from customers outside of the U.S. in the fiscal years ended December 31, 2012, 2011 and 2010, represented approximately 57%, 55%, and 50% of our revenue, respectively. The percentage of our revenue attributable to international operations primarily resulted from an increase in sales in the Asia Pacific region, particularly in the second half of 2012, offset by a decrease in sales in Europe, and a decrease in sales in the U.S., primarily to the satellite market. However, although no assurances can be given with respect to international sales growth in any one or more regions, we expect that international revenue is likely to continue to represent, from year to year, a substantial, if not growing, percentage of our annual revenue for the foreseeable future. Furthermore, most of our contract manufacturing occurs overseas. Our international operations, the international operations of our contract manufacturers, and our efforts to maintain and increase revenue in

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international markets are subject to a number of risks, which are generally greater with respect to emerging market countries, including the impact on our business and operating results of:

In the past, certain of our international customers accumulated significant levels of debt and engaged in reorganizations and financial restructurings, including bankruptcy proceedings. Even where these restructurings have been completed, in some cases these customers have not been in a position to purchase new equipment at levels we had seen in the past.

While our international revenue and operating expenses have typically been denominated in U.S. dollars, fluctuations in currency exchange rates could cause our products to become relatively more expensive to customers in a particular country, leading to a reduction in revenue or profitability from sales in that country. A portion of our European business is denominated in Euros, which subjects us to increased foreign currency risk. Gains and losses on the conversion to U.S. dollars of accounts receivable, accounts payable and other monetary assets and liabilities arising from international operations may contribute to fluctuations in our operating results.

Furthermore, payment cycles for international customers are typically longer than those for customers in the U.S. Unpredictable payment cycles could cause us to fail to meet or exceed the expectations of security analysts and investors for any given period.

Our operations outside the U.S. also require us to comply with a number of U.S. and international regulations. For example, our operations in countries outside the U.S. are subject to the FCPA and similar laws, which prohibit U.S. companies or their agents and employees from providing anything of value to a foreign official for the purposes of influencing any act or decision of these individuals, in their official capacity, to help obtain or retain business, direct business to any person or corporate entity, or obtain any unfair advantage. Our activities in countries outside the U.S. create the inherent risk of unauthorized payments or offers of payments by one of our employees or agents, including those companies to which we outsource certain of our business

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operations, which could be in violation of the FCPA, even though these parties are not always subject to our control. We have internal control policies and procedures with respect to FCPA compliance, have implemented FCPA training and compliance programs for our employees, and include in our agreements with distributors and resellers a requirement that those parties comply with the FCPA. However, we cannot provide assurances that our policies, procedures and programs will prevent violations of the FCPA or similar laws by our employees or agents, particularly in emerging market countries, and as we expand our international operations. Any such violation, even if prohibited by our policies, could result in criminal or civil sanctions against us.

The effect of one or more of these international risks could have a material and adverse effect on our business, financial condition, operating results and cash flows.

Our future growth depends on market acceptance of several broadband services, on the adoption of new broadband technologies, and on several other broadband industry trends.

Future demand for many of our products will depend significantly on the growing market acceptance of emerging broadband services, including digital video, VOD, HDTV, IPTV, mobile video services (particularly streaming to tablet computers and other mobile devices), and very high-speed data services. The market demand for such emerging services is rapidly growing, with many de facto or proprietary systems in use, which increases the challenge of delivering interoperable products intended to address the requirements of such services.

The effective delivery of these services will depend, in part, on a variety of new network architectures, standards and devices, such as:

If adoption of these emerging services and/or technologies is not as widespread or as rapid as we expect, or if we are unable to develop new products based on these technologies on a timely basis, our operating results, financial condition and cash flows could be materially and adversely affected.

Furthermore, other technological, industry and regulatory trends and requirements will affect the growth of our business. These trends and requirements include the following:

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If we fail to recognize and respond to these trends, by timely developing products, features and services required by these trends, we are likely to lose revenue opportunities and our operating results, financial condition and cash flows could be materially and adversely affected.

We purchase several key components, subassemblies and modules used in the manufacture or integration of our products from sole or limited sources, and we are increasingly dependent on contract manufacturers and other subcontractors.

Many components, subassemblies and modules necessary for the manufacture or integration of our products are obtained from a sole supplier or a limited group of suppliers. For example, we depend on a small public company for certain video encoding chips which are incorporated into several products. Our reliance on sole or limited suppliers, particularly foreign suppliers, and our increasing reliance on contractors for manufacturing and installation, involves several risks, including a potential inability to obtain an adequate supply of required components, subassemblies or modules, reduced control over costs, quality and timely delivery of components, subassemblies or modules, and timely installation of products. In particular, certain optical components have in the past been in short supply and are available only from a small number of suppliers, including sole source suppliers.

These risks could be heightened during a substantial economic slowdown, because our suppliers and subcontractors are more likely to experience adverse changes in their financial condition and operations during such a period. Further, these risks could materially and adversely affect our business if one of our sole sources, or a sole source of one of our suppliers or contract manufacturers, is adversely affected by a natural disaster. While we expend resources to qualify additional component sources, consolidation of suppliers and the small number of viable alternatives have limited the results of these efforts. Managing our supplier and contractor relationships is particularly difficult during time periods in which we introduce new products and during time periods in which demand for our products is increasing, especially if demand increases more quickly than we expect.

From time to time we assess our relationship with our contract manufacturers, and we do not generally maintain long-term agreements with any of our suppliers or contract manufacturers. Plexus Services Corp., which manufactures our products at its facilities in Malaysia, acts as our primary contract manufacturer, and currently provides us with a substantial majority of the products that we purchase from our contract manufacturers. Our agreement with Plexus has automatic annual renewals, unless prior notice is given by either party, and has been automatically renewed until October 2013.

Most of the products manufactured by our Israeli operations are outsourced to a single third party manufacturer located in Israel. Our ability to improve production efficiency with respect to those products had been limited, until 2012, by the terms of research grants that we received from the Israeli Office of the Chief Scientist, or OCS, an arm of the Israeli government. These grants restricted the transfer outside of Israel of intellectual property developed with funding from the OCS, and also limited the manufacturing outside of Israel of products containing such intellectual property. However, in 2012, the Company entered into an arrangement with the OCS that permits it to transfer a significant portion of such intellectual property, and manufacture products containing such portion of intellectual property, outside of Israel.

Difficulties in managing relationships with any of our current contract manufacturers, particularly Plexus, that manufacture our products off-shore, could impede our ability to meet our customers’ requirements and

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adversely affect our operating results. An inability to obtain adequate and timely deliveries, or any other circumstance that would require us to seek alternative sources of supply, could negatively affect our ability to ship our products on a timely basis, which could damage relationships with current and prospective customers and harm our business and materially and adversely affect our revenue and other operating results. We attempt to limit this risk by maintaining safety stocks of certain components, subassemblies and modules. Increases, from time to time, in demand on our suppliers and subcontractors from other parties have caused sporadic shortages of certain components and products. In response, we have increased our inventories of certain components and products and expedited shipments of our products when necessary, which has increased our costs. As a result of this investment in inventories, we have in the past been, and in the future may be, subject to risk of excessive or obsolete inventories, which, despite our use of a demand order fulfillment model, could materially and adversely affect our business, operating results, financial position and cash flows. In this regard, our gross margins and operating results have, in the past, been adversely affected by significant excess and obsolete inventory charges.

Our ability to meet customer demand depends significantly on the availability of components and other materials, as well as the ability of our contract manufacturers to scale their production, and because we purchase several key components, subassemblies and modules used in the manufacture or integration of our products from sole or limited sources, the risk of not meeting customer demand is increased. Our ability to meet customer requirements depends in part on our ability to obtain sufficient volumes of these materials in a timely fashion. Increases in demand on our suppliers and subcontractors from other customers may cause sporadic shortages of certain components and products. In order to be able to respond to these issues, we have increased our inventories of certain components and products, particularly for our customers that order significant dollar amounts of our products, and expedited shipments of components, subassemblies and modules when necessary, which has increased our costs and could increase our risk of holding obsolete or excessive inventory. We also employ a demand order fulfillment model which is designed to reduce the effects of increases or decreases in demand for any products. Nevertheless, we may be unable to respond to customer demand that increases more quickly than we expect. If we fail to meet customers’ supply expectations, our revenue would be adversely affected and we may lose business, which could materially and adversely affect our operating results, financial condition and cash flows.

Our operating results are likely to fluctuate significantly and, as a result, may fail to meet or exceed the expectations of securities analysts or investors, causing our stock price to decline.

Our operating results have fluctuated in the past and are likely to continue to fluctuate in the future, on an annual and a quarterly basis, as a result of several factors, many of which are outside of our control. Some of the factors that may cause these fluctuations include:

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The timing of deployment of our products by our customers can be subject to a number of other risks, including the availability of skilled engineering and technical personnel, the availability of third party equipment and services, our customers’ ability to negotiate and enter into rights agreements with video content owners that provide the customers with the right to deliver certain video content, and our customers’ need for local franchise and licensing approvals.

We often recognize a substantial portion of our quarterly revenue in the last month of the quarter. We establish our expenditure levels for product development and other operating expenses based on projected revenue levels for a specified period, and expenses are relatively fixed in the short term. Accordingly, even small variations in the timing of revenue, particularly from relatively large individual transactions, can cause significant fluctuations in operating results in a particular quarter.

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As a result of these factors and other factors, our operating results in one or more future periods may fail to meet or exceed the expectations of securities analysts or investors. In that event, the trading price of our common stock would likely decline.

Fluctuations in our future effective tax rates, or the outcome of tax audits, could affect our future operating results, financial condition and cash flows.

We are required to periodically review our deferred tax assets and determine whether, based on available evidence, a valuation allowance is necessary. Accordingly, we have performed such evaluation, from time to time, based on historical evidence, trends in profitability, expectations of future taxable income and implemented tax planning strategies. We continue to maintain a valuation allowance for certain foreign and California deferred tax assets. In the event, in the future, we determine an additional valuation allowance is necessary with respect to our U.S. state or foreign deferred tax assets, we would incur a charge equal to the amount of the valuation allowance, as a discrete item, in the period in which we made such determination and this could have a material and adverse effect on our operating results for such period.

The calculation of tax liabilities involves dealing with uncertainties in the application of complex global tax regulations. We recognize potential liabilities for anticipated tax audit issues in the U.S. and other tax jurisdictions based on our estimate of whether, and the extent to which, additional taxes will be due. In the event we determine that it is appropriate to create a reserve or increase an existing reserve for any such potential liabilities, the amount of the additional reserve is charged as an expense in the period in which it is determined. If payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when we determine the liabilities are no longer necessary. If the estimate of tax liabilities proves to be less than the ultimate tax assessment for the applicable period, a further charge to expense in the period such short fall is determined would result. Either such charge to expense could have a material and adverse effect on our results of operations for the applicable period.

In addition, recent statements from the Internal Revenue Service have indicated their intent to seek greater disclosure by companies of their reserves for uncertain tax positions.

Our 2008, 2009 and 2010 U.S. corporate income tax returns are presently being audited by the Internal Revenue Service. These audits commenced in the second quarter of 2011. A subsidiary of the Company is under an audit, which commenced in the first quarter of 2012, by the Israel tax authority for the years 2007 through 2010. If, upon the conclusion of these audits, the ultimate determination of taxes owed in the U.S. or Israel is for an amount in excess of the tax provision we have recorded in the applicable period, our overall tax expense, effective tax rate, operating results and cash flow could be materially and adversely impacted in the period of adjustment.

We requested an Advanced Pricing Agreement with the Internal Revenue Service regarding our non-exclusive license of our intellectual property rights to one of our international subsidiaries in 2008 and our sharing of research and development costs with our international subsidiaries. We completed the same non-exclusive license of Omneon intellectual property in the fourth quarter of 2010, upon the closing of the Omneon acquisition. Recently, we withdrew our request for the Advanced Pricing Agreement with the Internal Revenue Service with respect to our initial non-exclusive license of intellectual property. As noted above, our U.S. corporate tax returns for both 2008 and 2010 are presently being audited by the Internal Revenue Service. If the Internal Revenue Service, in connection with such audit or otherwise, were to disagree with our tax treatment of either of such non-exclusive licenses, we may be required to take a charge to expense related to such disagreement, which could have a material and adverse effect on our operating results in the period in which the charge is taken.

We continue to be in the process of expanding our international operations and staffing to better support our expansion into international markets. This expansion involves the implementation of an international structure that includes, among other things, an international support center in Europe, a research and development cost-

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sharing arrangement, and certain licenses and other contractual arrangements between us and our wholly-owned domestic and foreign subsidiaries. As a result of these changes, we anticipate that our consolidated pre-tax income will be subject to foreign tax at relatively lower tax rates when compared to the U.S. federal statutory tax rate and, as a consequence, our effective income tax rate is expected to be lower than the U.S. federal statutory rate.

Our future effective income tax rates could be adversely affected if tax authorities challenge our international tax structure or if the relative mix of U.S. and international income changes for any reason. Accordingly, there can be no assurance that our income tax rate will be less than the U.S. federal statutory rate in future periods.

We or our customers may face intellectual property infringement claims from third parties.

Our industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. In particular, leading companies in the telecommunications industry have extensive patent portfolios. From time to time, third parties have asserted, and may assert in the future, patent, copyright, trademark and other intellectual property rights against us or our customers. Our suppliers and their customers, including us, may have similar claims asserted against them. A number of third parties, including companies with greater financial and other resources than us, have asserted patent rights to technologies that are important to us.

Any intellectual property litigation, regardless of its outcome, could result in substantial expense and significant diversion of the efforts of our management and technical personnel. An adverse determination in any such proceeding could subject us to significant liabilities and temporary or permanent injunctions and require us to seek licenses from third parties or pay royalties that may be substantial. Furthermore, necessary licenses may not be available on terms satisfactory to us, or at all. An unfavorable outcome on any such litigation matter could require that we pay substantial damages, could require that we pay ongoing royalty payments, or could prohibit us from selling certain of our products. Any such outcome could have a material and adverse effect on our business, operating results, financial condition and cash flows.

In October 2011, Avid Technology, Inc. filed a complaint in the United States District Court for the District of Delaware, alleging that our Media Grid product infringes two patents held by Avid. In June 2012, Avid served a subsequent complaint, alleging that Harmonic’s Spectrum product infringes one patent held by Avid. The complaints seek injunctive relief and damages. At this time, we cannot predict the outcome of either of these matters. An unfavorable outcome of either of these matters, or any other intellectual property infringement action, could materially and adversely affect our business, operating results, financial position and cash flows.

Our suppliers and customers may have intellectual property claims relating to our products asserted against them. We have agreed to indemnify some of our suppliers and most of our customers for patent infringement relating to our products. The scope of this indemnity varies, but, in some instances, includes indemnification for damages and expenses (including reasonable attorney’s fees) incurred by the supplier or customer in connection with such claims. If a supplier or a customer seeks to enforce a claim for indemnification against us, we could incur significant costs defending such claim, the underlying claim or both. An adverse determination in either such proceeding could subject us to significant liabilities and have a material and adverse effect on our operating results, cash flows and financial condition.

We may be the subject of litigation which, if adversely determined, could harm our business and operating results.

In addition to the litigation discussed elsewhere herein, we may be subject to claims arising in the normal course of business. The costs of defending any litigation, whether in cash expenses or in management time, could harm our business and materially and adversely affect our operating results and cash flows. An unfavorable

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outcome on any litigation matter could require that we pay substantial damages, or, in connection with any intellectual property infringement claims, could require that we pay ongoing royalty payments or prohibit us from selling certain of our products. In addition, we may decide to settle any litigation, which could cause us to incur significant settlement costs. A settlement or an unfavorable outcome on any litigation matter could have a material and adverse affect on our business, operating results, financial condition and cash flows.

As an example, we have received letters from several of our customers, notifying us that the customer intends to exercise its indemnification rights in agreements between the customer and us with respect to a patent infringement claim brought against the customer that may cover products sold to the customer by Harmonic or its acquired companies. Many of these notices arise out of a spate of patent infringement claims, and related litigation, brought by the Multimedia Patent Trust (“MPT”), an affiliate of Alcatel-Lucent, against end-users of products used in the industries we address. Any such litigation by MPT may be very expensive to defend, and there could be significant financial exposure to each of such customers if MPT is successful in such litigation or in extracting a settlement of such claims. Few of the notices we have received from a customer with respect to its indemnification rights related to the MPT litigation have demanded that we provide a defense for the customer against such claims or litigation or currently reimburse the customer for its costs of such defense. We cannot predict whether the claims by MPT are legitimate or actually cover any of our products, whether the claims are likely to result in a settlement or judgment against a customer defendant (although some such settlements have occurred), or whether we would have liability under our indemnification obligations for defense or settlement costs or damages paid by any customer defendant. In the event one or more of our other customers makes a written indemnification claim against us with respect to a specific amount of defense or settlement costs or damages it suffers as a result of such MPT claims or litigation, we may be obligated to pay amounts to such customer(s) that, either individually or in the aggregate, could materially and adversely affect our operating results, financial condition and cash flows.

We rely on distributors, value-added resellers and systems integrators for a significant portion of our revenue, and disruptions to, or our failure to develop and manage our relationships with these customers and the processes and procedures that support them could adversely affect our business.

We generate a significant percentage of our revenue through sales to distributors, value-added resellers, or VARs, and systems integrators that assist us with fulfillment or installation obligations. We expect that these sales will continue to generate a significant percentage of our revenue in the future. Further, our reliance on VARs and systems integrators that specialize in video delivery solutions, products and services has increased since the completion of our acquisition of Omneon in 2010. Accordingly, our future success is highly dependent upon establishing and maintaining successful relationships with a variety of channel partners.

We generally have no long-term contracts or minimum purchase commitments with any of our distributor, VAR or system integrator customers, and our contracts with these parties do not prohibit them from purchasing or offering products or services that compete with ours. Our competitors may provide incentives to any of our distributor, VAR or systems integrator customers to favor their products or, in effect, to prevent or reduce sales of our products. Any of our distributor, VAR or systems integrator customers may independently choose not to purchase or offer our products. Many of our distributors, VARs and system integrators are small, are based in a variety of international locations, and may have relatively unsophisticated processes and limited financial resources to conduct their business. Any significant disruption of our sales to these customers, including as a result of the inability or unwillingness of these customers to continue purchasing our products, or their failure to properly manage their business with respect to the purchase of and payment for our products, could materially and adversely affect our business, operating results, financial condition and cash flows. In addition, our failure to continue to establish or maintain successful relationships with distributor, VAR and systems integrator customers could likewise materially and adversely affect our business, operating results, financial condition and cash flows.

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Changes in telecommunications legislation and regulations could harm our prospects and future revenue.

Changes in telecommunications legislation and regulations in the U.S. and other countries could affect the revenue from our products. In particular, regulations dealing with access by competitors to the networks of incumbent operators could slow or stop additional construction or expansion by these operators. Increased regulation of our customers’ pricing or service offerings could limit their investments and, consequently, revenue from our products. The impact of new or revised legislation or regulations could have a material adverse effect on our business, operating results, financial condition and cash flows.

Recently adopted Federal laws will likely impact the demand for product features by our customers. These laws include the Commercial Advertisement Loudness Mitigation Act and the Twenty-First Century Communications and Video Accessibility Act of 2010, which deals with accessibility for the hearing and visually impaired. While we have added some features to our products in anticipation of these laws, others (driven by the regulatory process related to the laws) may require feature development on a schedule which may be inflexible and difficult to meet. This could result in our inability to develop other product features necessary for particular transactions at the same time, and thus we could lose some business and the related revenue.

The ongoing threat of terrorism, social and political instability and tensions among countries have created uncertainty and may harm our business.

Conditions in the U.S. and global economies improved from mid-2010 to mid-2011, but remain uncertain. The terrorist attacks in the U.S. in 2001, subsequent and continuing attempted and accomplished terrorist attacks in other parts of the world, and the threat of future attacks have created many economic and political uncertainties that have adversely impacted the global economy and, as a result, have adversely affected our business. The long-term effects of such attacks, the threat of future attacks, the ongoing war on terrorism, recent increased social and political instability and regime changes, particularly in the Middle East, and tensions among countries, including between Iran and Israel and the U.S., on our business and the global economy remain uncertain. Such uncertainty has increased the price of certain commodities, particularly oil, which could have an indirect material and adverse impact on the cost of manufacturing and shipping our products. Moreover, the potential for future terrorist attacks, including hacking attacks on government and commercial computer systems, increases in such social and political instability and such tensions, particularly if Israel or any other country were to attack any of Iran’s nuclear development facilities, make it difficult to estimate the long-term stability and strength of the U.S. and other economies, particularly those in certain emerging market countries and certain European countries, and the impact of resulting economic conditions on our business.

We face risks associated with having important facilities and resources located in Israel.

We maintain facilities in two locations in Israel with a total of 221 employees, or approximately 19% of our worldwide workforce, as of December 31, 2012. Our employees in Israel engage in a number of activities, including research and development, the development of, and supply chain management for, one product line, and sales activities.

We are directly influenced by the political, economic and military conditions affecting Israel. Any significant conflict involving Israel could have a direct effect on our business or that of our Israeli contract manufacturers, in the form of physical damage or injury, reluctance to travel within, or to or from, Israel by our Israeli and other employees or those of our subcontractors, or the loss of Israeli employees to active military duty. Most of our employees in Israel are currently obligated to perform annual reserve duty in the Israel Defense Forces, and approximately 15% of those employees were called for active military duty in 2012. In the event that more employees are called to active duty, certain of our research and development activities may be adversely affected, including significantly delayed. In addition, the interruption or curtailment of trade between Israel and its trading partners, as a result of terrorist attacks or hostilities, conflicts between Israel and any other Middle Eastern country, or any other cause, could significantly harm our business. Current or future tensions in the Middle East could materially and adversely affect our business, operating results, financial condition and cash flows.

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We have made, and expect to continue to make, acquisitions, and any acquisition could disrupt our operations, cause dilution to our stockholders and materially and adversely affect our business, operating results, cash flows and financial condition.

As part of our business strategy, from time to time we have acquired, and we continue to consider acquiring, businesses, technologies, assets and product lines that we believe complement or expand our existing business. In 2010, we completed the acquisition of Omneon, a privately-held company that provides broadcast video server and storage systems used for video production and play-to-air workflows. It is possible that we will make additional acquisitions, from time to time, in the future.

We may face challenges as a result of these acquisition activities, because such activities entail numerous risks, including:

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Competition within our industry for acquisitions of businesses, technologies, assets and product lines has been, and is likely to continue to be, intense. As such, even if we are able to identify an acquisition that we would like to consummate, we may not be able to complete the acquisition on commercially reasonable terms or because the target chooses to be acquired by another company. Furthermore, in the event that we are able to identify and consummate any future acquisitions, we may, in each of those acquisitions:

These financing activities or expenditures could materially and adversely affect our operating results, cash flows and financial condition or the price of our common stock, or both. Alternatively, due to difficulties in the capital or credit markets, we may be unable to secure capital on reasonable terms, or at all, necessary to complete an acquisition.

Moreover, even if we were to obtain benefits from acquisitions in the form of increased revenue and earnings per share, there may be a delay between the time the expenses associated with an acquisition are incurred and the time we recognize such benefits.

As of December 31, 2012, we have approximately $213 million of goodwill recorded on our balance sheet associated with prior acquisitions. In the event we determine that our goodwill is impaired, we would be required to write down all or a portion of such goodwill, which could result in a material non-cash charge to our results of operations in the period in which such write-down occurs.

If we are unable to successfully address any of these risks, our business, operating results, financial condition and cash flows could be materially and adversely affected.

We may sell one or more of our product lines, from time to time, as a result of our evaluation of our products and markets, and any such divestiture could adversely affect our expenses, revenues, results of operation, cash flows and financial position.

We periodically evaluate our various product lines and may, as a result, consider the divestiture of one or more of those product lines. Any such divestiture could adversely affect our expenses, revenues, results of operations, cash flows and financial position.

On February 18, 2013, we entered into an Asset Purchase Agreement with Aurora Networks pursuant to which we agreed to sell our cable access HFC business (the “Business”) for $46 million in cash. Although no assurance can be given as to whether and when this transaction will close, it is presently scheduled to close on March 4, 2013, and may be terminated by either party if it does not close by March 29, 2013. In 2012, revenue from this Business was approximately $53 million, which represented approximately 10% of our revenue for the year.

Divestitures of product lines have inherent risks, including the expense of selling the product line, the possibility that any anticipated sale will not occur, possible delays in closing any sale, the risk of lower-than-expected proceeds from the sale of the divested business, unexpected costs associated with the separation of the business to be sold from the seller’s information technology and other operating systems, and potential post-closing claims for indemnification. Expected cost savings, which are offset by revenue losses from divested businesses, may also be difficult to achieve or maximize due to the seller’s fixed cost structure, and a seller may experience varying success in reducing fixed costs or transferring liabilities previously associated with the divested business.

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The sale of the Business, if it closes, would reduce future annual potential revenue, likely in the range of $50 million to $55 million, future annual expenses, including cost of sales, likely in the range of $45 million to $50 million, and cash flow. With this reduction in revenue and cash flow, the sale could also have an adverse affect on our results of operations and financial position. A failure of the sale to close would have a material effect on our expenses in the quarter in which it is scheduled to close.

Broadband communications markets are characterized by rapid technological change.

Broadband communications markets are subject to rapid changes, making it difficult to accurately predict the markets’ future growth rates, sizes or technological directions. In view of the evolving nature of these markets, it is possible that pay TV service providers, broadcasters, content providers and other video production and delivery companies will decide to adopt alternative architectures, new business models, and/or technologies that are incompatible with our current or future products. In addition, successful new entrants into the media markets, both domestic and international, may impact existing industry business models, resulting in decreased spending by our existing customer base. Finally, decisions by customers to adopt new technologies or products are often delayed by extensive evaluation and qualification processes, which can result in delays in revenue from current and new products. If we are unable to design, develop, manufacture and sell products that incorporate, or are compatible with, these new architectures or technologies, our business, operating results, financial condition and cash flows would be materially and adversely affected.

Our operating results could be adversely affected by natural disasters affecting the Company or impacting our third-party manufacturers, suppliers, distributors or customers.

Our headquarters and the majority of our operations are located in California, which is prone to earthquakes. In the event that any of our business centers are adversely affected by an earthquake or by any other natural disaster, we may sustain damage to our operations and properties, which could cause a sustained interruption or loss of affected operations, and cause us to suffer significant financial losses.

We rely on third-party manufacturers for the production of most of our products. Any significant disruption in the business or operations of such manufacturers or of our suppliers could adversely impact our business. Our principal third-party manufacturer and several of our suppliers and distributors have operations in locations that are subject to natural disasters, such as severe weather, tsunamis, floods and earthquakes, which could disrupt their operations and, in turn, our operations.

In addition, if there is a major earthquake or other natural disaster in any of the locations in which our significant customers are located, we face the risk that our customers may incur losses or sustained business interruption, or both, which may materially impair their ability to continue their purchase of products from us. Accordingly, a major earthquake or other natural disaster in one of the geographies in which we, or our third-party manufacturers, suppliers or customers, operate could have a material and adverse effect on our business, operating results, cash flows and financial condition.

In order to manage our growth, we must be successful in addressing management succession issues and attracting and retaining qualified personnel.

Our future success will depend, to a significant extent, on the ability of our management to operate effectively, both individually and as a group. We must successfully manage transition and replacement issues that may result from the departure or retirement of members of our executive management, whether in the context of an acquisition or otherwise. We cannot provide assurances that changes of management personnel in the future would not cause disruption to operations or customer relationships or a decline in our operating results.

We are also dependent on our ability to retain and motivate our existing highly qualified personnel, in addition to attracting new highly qualified personnel. Competition for qualified management, technical and other personnel is often intense, and we may not be successful in attracting and retaining such personnel. Competitors

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and others have in the past attempted, and are likely in the future to attempt, to recruit our employees. While our employees are required to sign standard agreements concerning confidentiality and ownership of inventions, we generally do not have employment contracts or non-competition agreements with any of our personnel. The loss of the services of any of our key personnel, the inability to attract or retain highly qualified personnel in the future or delays in hiring such personnel, particularly senior management and engineers and other technical personnel, could negatively affect our business and operating results.

We may not be able to effectively manage our operations.

In recent years, the Company has grown significantly, principally through acquisitions, and expanded our international operations. Upon the closing of our acquisition of Scopus in 2009, we added 221 employees, most of whom are based in Israel. Upon the closing of the acquisition of Omneon in 2010, we added 286 employees, most of whom are based in the U.S.

As of December 31, 2012, we have 488 employees in our international operations, representing approximately 43% of our worldwide workforce. Our ability to manage our business effectively in the future, including with respect to any future growth, the integration of recent and any future acquisitions, and the breadth of our international operations, will require us to train, motivate and manage our employees successfully, to attract and integrate new employees into our overall operations, to retain key employees and to continue to improve our operational, financial and management systems. There can be no assurances that we will be successful in any of those regards, and our failure to effectively manage our operations could have a material and adverse effect on our business, operating results, cash flows and financial condition.

Our failure to adequately protect our proprietary rights and data may adversely affect us.

At December 31, 2012, we held 59 issued U.S. patents and 22 issued foreign patents, and have a number of patent applications pending. Although we attempt to protect our intellectual property rights through patents, trademarks, copyrights, licensing arrangements, maintaining certain technology as trade secrets and other measures, we can give no assurances that any patent, trademark, copyright or other intellectual property rights owned by us will not be invalidated, circumvented or challenged, that such intellectual property rights will provide competitive advantages to us, or that any of our pending or future patent applications will be issued with the scope of the claims sought by us, if at all. We can give no assurances that others will not develop technologies that are similar or superior to our technologies, duplicate our technologies or design around the patents that we own. In addition, effective patent, copyright and trade secret protection may be unavailable or limited in certain foreign countries in which we do business or may do business in the future.

We believe that patents and patent applications are not currently significant to our business, and we do not rely on our patent portfolio to give us a competitive advantage over others in our industry. We believe that the future success of our business will depend on our ability to translate the technological expertise and innovation of our personnel into new and enhanced products. We generally enter into confidentiality or license agreements with our employees, consultants, and vendors and our customers, as needed, and generally limit access to, and distribution of, our proprietary information. Nevertheless, we cannot provide assurances that the steps taken by us will prevent misappropriation of our technology. In addition, we have taken in the past, and may take in the future, legal action to enforce our patents and other intellectual property rights, to protect our trade secrets, to determine the validity and scope of the proprietary rights of others, or to defend against claims of infringement or invalidity. Such litigation could result in substantial costs and diversion of management time and other resources, and could materially and adversely affect our business, operating results, financial condition and cash flows.

Recently reported hacking attacks on government and commercial computer systems, particularly attacks sponsored by foreign governments or enterprises, raise the risks that such an attack may compromise, in a material respect, one or more of our computer systems and permit hackers access to our proprietary information and data. If such an attack does, in fact, allow access to or theft of our proprietary information or data, our business, operating results, financial condition and cash flows could be materially and adversely affected.

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Our products include third-party technology and intellectual property, and our inability to acquire new technologies or use third-party technology in the future could harm our business.

In order to successfully develop and market certain of our planned products, we may be required to enter into technology development or licensing agreements with third parties. Although companies with technology useful to us are often willing to enter into technology development or licensing agreements with respect to such technology, we cannot provide assurances that such agreements may be negotiated on commercially reasonable terms, or at all. The failure to enter into such technology development or licensing agreements, when necessary or desirable, could limit our ability to develop and market new products and could materially and adversely affect our business.

We incorporate certain third-party technologies, including software programs, into our products, and, as noted, intend to utilize additional third-party technologies in the future. In addition, the technologies that we license may not operate properly or as specified, and we may not be able to secure alternatives in a timely manner, either of which could harm our business. We could face delays in product releases until alternative technology can be identified, licensed or developed, and integrated into our products, if we are able to do so at all. These delays, or a failure to secure or develop adequate technology, could materially and adversely affect our business, operating results, financial condition and cash flows.

We cannot assure you that our stock repurchase program will actually result in repurchases of our common stock or enhance long-term stockholder value, and repurchases, if any, could affect our stock price and increase its volatility and will diminish our cash reserves.

On January 28, 2013, our Board of Directors approved a $75 million increase to our existing $25 million stock repurchase program. On February 19, 2013, the Board approved a further approximately $35 million increase to the program, contingent upon the closing of a sale of the Company’s cable access HFC business. The Board has authorized aggregate repurchases under the program of $135 million, $22.6 million of which had been utilized for repurchases as of December 31, 2012. Under the program, we are authorized to repurchase shares of common stock in open market transactions or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Exchange Act. The timing and actual number of shares repurchased, if any, will depend on a variety of factors, including the price and availability of our shares, trading volume and general market conditions. The program may be suspended or discontinued at any time without prior notice. Repurchases pursuant to our stock repurchase program could affect our stock price and increase its volatility. The existence of a stock repurchase program could also cause our stock price to be higher than it would be in the absence of such a program and could potentially reduce the market liquidity for our stock. Additionally, repurchases under our stock repurchase program will diminish our cash reserves, which could impact our ability to pursue possible future strategic opportunities and acquisitions and could result in lower overall returns on our cash balances. There can be no assurance that any stock repurchases will, in fact, occur, or, if they occur, that they will enhance stockholder value because the market price of our common stock may decline below the levels at which we repurchased shares of stock. Although our stock repurchase program is intended to enhance long-term stockholder value, short-term stock price fluctuations could reduce the program’s effectiveness.

We are subject to import and export controls that could subject us to liability or impair our ability to compete in international markets.

Our products are subject to U.S. export controls, and may be exported outside the U.S. only with the required level of export license or through an export license exception, in most cases because we incorporate encryption technology into our products. In addition, various countries regulate the import of certain technology and have enacted laws that could limit our ability to distribute our products, or could limit our customers’ ability to implement our products, in those countries. Changes in our products or changes in export and import regulations may create delays in the introduction of our products in international markets, prevent our customers with international operations from deploying our products throughout their global systems or, in some cases, prevent the export or import of our products to certain countries altogether. Any change in export or import

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regulations or related legislation, shift in approach to the enforcement or scope of existing regulations, or change in the countries, persons or technologies targeted by such regulations, could result in decreased use of our products by, or in our decreased ability to export or sell our products to, existing or potential customers internationally.

In addition, we may be subject to customs duties that could have a significant adverse impact on our operating results or, if we are able to pass on the related costs in any particular situation, would increase the cost of the related product to our customers. As a result, the future imposition of significant increases in the level of customs duties or the creation of import quotas on our products in Europe or in other jurisdictions, or any of the limitations on international sales described above, could have a material adverse effect on our business, operating results, financial condition and cash flows. Further, some of our customers in Europe have been, or are being, audited by local governmental authorities regarding the tariff classifications used for importation of our products. Import duties and tariffs vary by country and a different tariff classification for any of our products may result in higher duties or tariffs, which could have an adverse impact on our operating results and potentially increase the cost of the related products to our customers.

We may need additional capital in the future and may not be able to secure adequate funds on terms acceptable to us.

We have been engaged in the design, manufacture and sale of a variety of video products and system solutions since inception, which has required, and will continue to require, significant research and development expenditures.

We believe that our existing cash and short-term investments of approximately $201 million, at December 31, 2012, even as reduced through the repurchase of our common stock under the program discussed on page 34 above, will satisfy our cash requirements for at least the next twelve months. However, we may need to raise additional funds if our expectations are incorrect, to take advantage of presently unanticipated strategic opportunities, to satisfy our other cash requirements from time to time, or to strengthen our financial position. Our ability to raise funds may be adversely affected by a number of factors, including factors beyond our control, such as weakness in the economic conditions in markets in which we sell our products and continued uncertainty in financial, capital and credit markets. There can be no assurance that equity or debt financing will be available to us on reasonable terms, if at all, when and if it is needed.

In addition, we regularly review potential acquisitions that would complement our existing product offerings, enhance our technical capabilities, or expand our marketing and sales presence. Any future transaction of this nature could require potentially significant amounts of capital to finance the acquisition and related expenses, as well as to integrate operations following the acquisition, and could require us to issue our stock and dilute existing stockholders.

We may raise additional financing through public or private equity offerings, debt financings, or corporate partnership or licensing arrangements. To the extent we raise additional capital by issuing equity securities or convertible debt, our stockholders may experience dilution. To the extent that we raise additional funds through collaboration and licensing arrangements, it may be necessary to relinquish some rights to our technologies or products, or grant licenses on terms that are not favorable to us. To the extent we raise capital through debt financing arrangements, we may be required to pledge assets or enter into covenants that could restrict our operations or our ability to incur further indebtedness and the interest on such debt may adversely affect our operating results.

If adequate capital is not available, or is not available on reasonable terms, when needed, we may not be able to take advantage of acquisition or other market opportunities, to timely develop new products, or to otherwise respond to competitive pressures.

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Negative conditions in the global credit and financial markets may impair the liquidity or the value of a portion of our investment portfolio.

Negative conditions in the global credit and financial markets have had an adverse impact on the liquidity of certain of our investments in the past. In the event we need or desire to access funds from the short-term investments that we hold, it is possible that we may not be able to do so due to market conditions. If a buyer is found, but is unwilling to purchase the investments at par or our cost, we may incur a loss. Further, rating downgrades of the security issuer or the third parties insuring such investments may require us to adjust the carrying value of these investments through an impairment charge. Our inability to sell all or some of our short-term investments at par or our cost, or rating downgrades of issuers or insurers of these securities, could materially and adversely affect our operating results, financial condition and cash flows.

In addition, we invest our cash, cash equivalents and short-term investments in a variety of investment vehicles, in a number of countries, with, and in the custody of, financial institutions with high credit ratings. While our investment policy and strategy attempt to manage interest rate risk, limit credit risk, and ensure we only invest in what we view as very high-quality securities, the outlook for our investment holdings is dependent on general economic conditions, interest rate trends and volatility in the financial marketplace, both internationally and in the U.S., which can all affect, directly and indirectly, the income that we receive, the value of our investments and our ability to sell those investments.

We believe that our investment securities are carried at fair value. However, over time the economic and market environment in which we conduct business may provide us with additional insight regarding the fair value of certain securities in our portfolio that could change our judgment regarding impairment of those securities. This could result in unrealized or realized losses in our securities, relating to other than temporary declines, being charged against income. Given current market conditions, particularly in Europe, there is continuing risk that declines in fair value of our portfolio securities may occur and impairments may be charged to income in future periods.

If demand for our products increases more quickly than we expect, we may be unable to meet our customers’ requirements.

If demand for our products increases, the difficulty of accurately forecasting our customers’ requirements and meeting these requirements will increase. Forecasting to meet customers’ needs and effectively managing our supply chain is particularly difficult in connection with newer products. Our ability to meet customer demand depends significantly on the availability of components and other materials, as well as the ability of our contract manufacturers to scale their production. Furthermore, we purchase several key components, subassemblies and modules used in the manufacture or integration of our products from sole or limited sources. Our ability to meet customer requirements depends in part on our ability to obtain sufficient volumes of these materials in a timely fashion. Increases in demand on our suppliers and subcontractors from other customers may cause sporadic shortages of certain components and products. In order to be able to respond to these issues, we have increased our inventories of certain components and products, particularly for our customers that order significant dollar amounts of our products, and expedited shipments of our products when necessary, which has increased our costs and could increase our risk of holding obsolete or excessive inventory. We also employ a demand order fulfillment model which is designed to reduce the effects of increases or decreases in demand for any products. Nevertheless, we may be unable to respond to customer demand that increases more quickly than we expect. If we fail to meet customers’ supply expectations, our revenue would be adversely affected and we may lose business, which could materially and adversely affect our operating results, financial condition and cash flows.

We are subject to various laws and regulations related to the environment and potential climate change that could impose substantial costs upon us and may adversely affect our business, operating results, cash flows and financial condition.

Our operations are regulated under various federal, state, local and international laws relating to the environment and potential climate change, including those governing the management, disposal and labeling of

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hazardous substances and wastes and the cleanup of contaminated sites. We could incur costs and fines, third-party property damage or personal injury claims, or could be required to incur substantial investigation or remediation costs, if we were to violate or become liable under environmental laws. The ultimate costs to us under these laws and the timing of these costs are difficult to predict.

We also face increasing complexity in our product design as we adjust to new and future requirements relating to the presence of certain substances in electronic products and making producers of those products financially responsible for the collection, treatment, recycling, and disposal of certain products. For example, the European Parliament and the Council of the European Union have enacted the Waste Electrical and Electronic Equipment (WEEE) directive, which regulates the collection, recovery and recycling of waste from electrical and electronic products, and the Restriction on the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (RoHS) directive, which bans the use of certain hazardous materials, including lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs) that exceed certain specified levels. Legislation similar to RoHS and WEEE has been or may be enacted in other jurisdictions, including in the U.S., Japan and China. Our failure to comply with these laws could result in our being directly or indirectly liable for costs, fines or penalties and third-party claims, and could jeopardize our ability to conduct business in such regions and countries.

We also expect that our operations will be affected by other new environmental laws and regulations on an ongoing basis. Although we cannot predict the ultimate impact of any such new laws and regulations, they will likely result in additional costs, and could require that we redesign or change how we manufacture our products, any of which could have a material and adverse effect on our operating results, financial condition and cash flows.

Some anti-takeover provisions contained in our certificate of incorporation and bylaws, as well as provisions of Delaware law, could impair a takeover attempt.

We have provisions in our certificate of incorporation and bylaws that could have the effect of rendering more difficult or discouraging an acquisition deemed undesirable by our Board of Directors. These include provisions:

These provisions, alone or together, could delay hostile takeovers, changes in control of the Company or changes in our management.

As a Delaware corporation, we are also subject to provisions of Delaware law, including Section 203 of the Delaware General Corporation law, which prevents some stockholders holding more than 15% of our outstanding common stock from engaging in certain business combinations without approval of the holders of substantially all of our outstanding common stock.

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Any provision of our certificate of incorporation or bylaws or Delaware law that has the effect of delaying or deterring a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our common stock, and could also affect the price that some investors are willing to pay for our common stock.

Our common stock price may be extremely volatile, and the value of an investment in our stock may decline.

Our common stock price has been highly volatile. We expect that this volatility will continue in the future due to factors such as:

In addition, in recent years, the stock market in general, and the NASDAQ Stock Market and the securities of technology companies in particular, have experienced extreme price and volume fluctuations. These fluctuations have often been unrelated or disproportionate to the operating performance of individual companies. These broad market fluctuations have in the past, and may in the future, materially and adversely affect our stock price, regardless of our operating results. In these circumstances, investors may be unable to sell their shares of our common stock at or above their purchase price over the short term, or at all.

Our stock price may decline if additional shares are sold in the market or if analysts drop coverage of or downgrade our stock.

Future sales of substantial amounts of shares of our common stock by our existing stockholders in the public market, or the perception that these sales could occur, may cause the market price of our common stock to decline. In addition, we will be required to issue substantial amounts of additional shares upon exercise of stock options, including under our Employee Stock Purchase Agreement, or grants of restricted stock units. Increased sales of our common stock in the market after exercise of outstanding stock options or grants of restricted stock units could exert downward pressure on our stock price. These sales also might make it more difficult for us to sell equity or equity-related securities in the future at a time and price we deem appropriate.

The trading market for our common stock relies in part on the availability of research and reports that third-party industry or securities analysts publish about us. If one or more of the analysts who do cover us downgrade our stock, our stock price may decline. If one or more of these analysts cease coverage of us, we could lose visibility in the market, which in turn could cause the liquidity of our stock and our stock price to decline.

We are exposed to additional costs and risks associated with complying with increasing regulation of corporate governance and disclosure standards.

We have spent, and expect to continue to spend, a substantial amount of management time and costly external resources to comply with changes in laws, regulations and standards relating to corporate governance and public disclosure, including the Sarbanes-Oxley Act of 2002, SEC regulations, the NASDAQ Stock Market

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rules and applicable provisions of the Dodd-Frank Act of 2010. In particular, Section 404 of the Sarbanes-Oxley Act requires management’s annual review and evaluation of our internal control over financial reporting and attestation of the effectiveness of our internal control over financial reporting by our independent registered public accounting firm in connection with the filing of our Form 10-K for each fiscal year. We have documented and tested our internal control systems and procedures and have made improvements in order for us to comply with the requirements of Section 404. This process has required us to hire additional personnel and outside advisory services and has resulted in significant additional expenses.

While our management’s assessment of our internal control over financial reporting resulted in our conclusion that, as of December 31, 2012, our internal control over financial reporting was effective, and our independent registered public accounting firm has attested that our internal control over financial reporting was effective in all material respects as of December 31, 2012, we cannot predict the outcome of our testing and that of our independent registered public accounting firm in future periods. If we conclude in future periods that our internal control over financial reporting is not effective or if our independent registered public accounting firm is unable to provide an unqualified attestation as of future year-ends, we may incur substantial additional costs in an effort to correct such problems and investors may lose confidence in our financial statements, and the price of our stock will likely decrease in the short term, until we correct such problems, and perhaps in the long term, as well.

In addition, we are subject to new requirements under the Dodd-Frank Act of 2010 that will require us to diligence, disclose, and report whether or not our products contain conflict minerals. The implementation of these new requirements could adversely affect the sourcing, availability, and pricing of the materials used in the manufacture of semiconductor devices or other components used in our products. In addition, we will incur additional costs to comply with the disclosure requirements, including costs related to conducting diligence procedures to determine the sources of conflict minerals that may be used or necessary to the production of our products and, if applicable, potential changes to products, processes or sources of supply as a consequence of such verification activities. It is also possible that we may face reputational harm if we determine that certain of our products contain minerals not determined to be conflict free and/or we are unable to alter our products, processes or sources of supply to avoid such materials.

Available Information

Harmonic makes available free of charge, on the Harmonic web site, the Company’s Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K (via link to the SEC website), and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after Harmonic files such material with, or furnishes such material to, the Securities and Exchange Commission. The address of the Harmonic web site is http://www.harmonicinc.com. Except as expressly set forth in this Form 10-K, the contents of our web site are not incorporated into, or otherwise to be regarded as part of, this report.

None.

All of our facilities are leased, including our principal operations and corporate headquarters in San Jose, California. We also have research and development centers in Oregon, New York and New Jersey, several sales offices in the U.S., sales and support centers in Europe and Asia, and research and development centers in Israel and Hong Kong. Our leases, which expire at various dates through September 2021, are for an aggregate of approximately 446,000 square feet of space. The San Jose lease has a term of ten years and is for approximately 188,000 square feet of space. The San Jose facility houses our manufacturing, research and development and

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corporate headquarters functions. We believe that the facilities that we currently occupy are adequate for our current needs and that suitable additional space will be available, as needed, to accommodate the presently foreseeable expansion of our operations.

Of our leased facilities, an aggregate of approximately 76,000 square feet is in the Omneon Sunnyvale office and the Scopus New Jersey office and is in excess of our space requirements. We no longer occupy these facilities and the estimated loss, net of potential estimated sublease income, for this square footage has been included in the excess facilities charges recorded in the year ended December 31, 2010. The Scopus New Jersey lease terminated in May 2011 and the Omneon Sunnyvale lease terminates in June 2013.

In October 2011, Avid Technology, Inc. (“Avid”) filed a complaint in the United States District Court for the District of Delaware alleging that Harmonic’s Media Grid product infringes two patents held by Avid. In June 2012, Avid served a subsequent complaint alleging that Harmonic’s Spectrum product infringes one patent held by Avid. The complaints seek injunctive relief and damages.

On November 14, 2012, FastVDO served a lawsuit on Harmonic, alleging infringement of a patent allegedly essential to the H.264 standard and that Harmonic encoders, transcoders, software and servers that use H.264 infringe their patent.

At this time, the Company cannot predict the outcome of the above matters. An unfavorable outcome of these matters could materially and adversely affect the Company’s business, operating results, financial position and cash flows.

In April 2010, Arris Corporation filed a complaint in the United States District Court in Atlanta, alleging that the Company’s Streamliner 3000 product infringes four patents held by Arris. The complaint sought injunctive relief and damages. In connection with this matter, the Company recorded a $1.3 million liability in the fourth quarter of 2010, based on a tentative agreement of Arris and Harmonic with respect to the settlement of the action. In April 2011, this matter was settled on essentially the same terms as the tentative agreement and the action was dismissed.

In March 2010, Interkey ELC Ltd, or Interkey, filed a lawsuit in Israel, alleging breach of contract against Harmonic and Scopus Video Networks Ltd. (now Harmonic Video Networks Ltd. or “HVN”), which was acquired by Harmonic in March 2009. The plaintiffs were seeking damages in the amount of 6,300,000 ILS (approximately $1.7 million). On June 26, 2012, the action was dismissed by the Israeli Central District Court.

An unfavorable outcome on the matters referenced above or any other litigation matter could require that Harmonic pay substantial damages, or, in connection with any intellectual property infringement claims, could require that the Company pay ongoing royalty payments or could prevent the Company from selling certain of its products. As a result, a settlement of, or an unfavorable outcome on, any of the matters referenced above or other litigation matters could have a material adverse effect on Harmonic’s business, operating results, financial position and cash flows.

Harmonic’s industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. From time to time, third parties have asserted, and may in the future assert, exclusive patent, copyright, trademark and other intellectual property rights against us or the Company’s customers. Such assertions arise in the normal course of the Company’s operations. The resolution of any such assertions and claims cannot be predicted with certainty.

Not applicable

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PART II

Market Information of our Common Stock

Our common stock is traded on the NASDAQ Global Market under the symbol HLIT, and has been listed on NASDAQ since our initial public offering on May 22, 1995. The following table sets forth, for the periods indicated, the high and low sales price per share of our common stock as reported on the Nasdaq Global Market:

Holders

As of February 7, 2013, there were approximately 534 holders of record of our common stock.

Dividend Policy

We have never declared or paid any dividends on our capital stock. At this time, we expect to retain future earnings, if any, for use in the operation and expansion of our business and do not anticipate paying any cash dividends in the foreseeable future. Our line of credit includes covenants prohibiting the payment of cash dividends.

Repurchases of Equity Securities by the Issuer

On April 24, 2012, our Board of Directors approved a stock repurchase program that provides for the repurchase of up to $25 million of the Company’s outstanding common stock during the term of the program, which expires 18 months from Board approval. Under the program, the Company may purchase shares of common stock through open market transactions at prices deemed appropriate by management, subject to certain pre-determined price/volume guidelines set, from time to time, by the Board. The timing and amount of repurchase transactions under this program depend on a variety of factors, including price, corporate and regulatory requirements, strategic priorities and other market conditions. The purchases are funded from available working capital. The stock repurchase program may be suspended or discontinued at any time.

During fiscal 2012, we repurchased and retired approximately 5.1 million shares of our common stock at an average price of $4.43 per share for an aggregate purchase price of $22.6 million. The remaining authorized amount for stock repurchases under this program was approximately $2.4 million as of December 31, 2012. On January 28, 2013, the Company’s Board approved a $75 million increase in the stock repurchase program. On February 6, 2013, the Board approved a modification to the program that permits the Company to repurchase its common stock pursuant to a plan that meets the requirements of Rule 10b5-1 under the Securities Exchange Act of 1934. The program is presently scheduled to expire in July, 2014. On February 19, 2013, the Board approved a further approximately $35 million increase to the program, contingent upon the closing of a sale of the Company’s cable access HFC business. See Note 20, “Subsequent Events” of our Consolidated Financial Statements. The Board has authorized aggregate repurchases under the program of $135 million, $22.6 million of which had been utilized for purchases as of December 31, 2012.

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The following table is a summary of our stock repurchases during the quarter ended December 31, 2012 (in thousands, except per share data):

STOCK PERFORMANCE GRAPH

Set forth below is a line graph comparing the annual percentage change in the cumulative return to the stockholders of the Company’s common stock with the cumulative return of the NASDAQ Telecommunications Index and of the Standard & Poor’s (S&P) 500 Index for the period commencing December 31, 2007 and ending on December 31, 2012. The graph assumes that $100 was invested in each of the Company’s common stock, the S&P 500 and the NASDAQ Telecommunications Index on December 31, 2007, and assumes the reinvestment of dividends, if any. The comparisons shown in the graph below are based upon historical data. Harmonic cautions that the stock price performance shown in the graph below is not indicative of, nor intended to forecast, the potential future performance of the Company’s common stock.

The information contained in this Stock Performance Graph section shall not be deemed to be “soliciting material”, “filed” or incorporated by reference in previous or future filings with the SEC, or subject to the liabilities of Section 18 of the Securities Exchange Act of 1934, except to the extent that Harmonic specifically incorporates it by reference into a document filed under the Securities Act of 1933 or the Securities Exchange Act of 1934.

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The data set forth below are qualified in their entirety by reference to, and should be read in conjunction with, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and the Consolidated Financial Statements and related notes included elsewhere in this Annual Report on Form 10-K. The consolidated statement of operations data for the years ended December 31, 2009 and 2008, and the consolidated balance sheet data as of December 31, 2010, 2009, and 2008, are derived from audited consolidated financial statements that are not included in this report. Historical results are not necessarily indicative of future results.

The following factors affect the comparability of the information reflected in the selected financial data tables provided above:

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OVERVIEW

We design, manufacture and sell versatile and high performance video infrastructure products and system solutions. We enable our customers to efficiently create, prepare and deliver a full range of video services to consumer devices, including televisions, personal computers, tablets and mobile phones. Our products generally fall into three principal categories; video production platforms and playout solutions, video processing solutions and edge and access solutions. We also provide technical support services and professional services to our customers worldwide.

The principal markets we serve are cable television, direct broadcast satellite system companies, telecommunications companies, or “telcos”, broadcasters and media companies, as well as, more recently, the emerging streaming media providers, that create video programming or offer video-based infrastructure. Historically, a majority of our revenue has been derived from relatively few customers, due in part to the consolidation of the ownership of cable television and direct broadcast satellite system companies. Sales to our ten largest customers in 2012, 2011 and 2010 accounted for approximately 33%, 35% and 44%, respectively, of our revenue. Revenue from our ten largest customers has decreased as a percentage of revenue, due to our growing customer base, in part, as a result of acquisitions we have made. Although we are attempting to broaden our customer base by penetrating new markets and further expanding internationally, we expect to see continuing industry consolidation and customer concentration. During 2012, 2011 and 2010, revenue from Comcast accounted for 12%, 11% and 17%, respectively, of our revenue. The loss of Comcast or any other significant customer, any material reduction in orders by Comcast or any significant customer, or our failure to qualify our new products with a significant customer could materially and adversely affect our operating results, financial condition and cash flows.

We recognized revenue of $530 million in 2012, as compared to $549 million in 2011. Our international revenue represents a growing part of our business. In 2012, international revenue represented 57% of our total revenue, as compared to 55% in 2011. In recognition of our growing international business opportunities, we have expanded our international operations and staffing to better support our expansion into international markets. We expect that international sales will continue to account for a significant portion of our net revenue for the foreseeable future and that, due to sales to emerging markets in particular, our international revenue may increase as a percentage of our total net revenue from year to year.

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Historically, our revenue has been dependent upon capital spending in the cable, satellite, telco and broadcast industries. More recently, we also have derived revenue from media companies, including streaming media providers. Industry consolidation has in the past constrained, and may in the future constrain, capital spending by our customers. If our product portfolio and product development plans do not position us well to capture an increased portion of the capital spending of customers in the markets on which we focus, our revenue may decline. As we attempt to further diversify our customer base in these markets, we may need to continue to build alliances with other equipment manufacturers and content providers, adapt our products for new applications, take orders at prices resulting in lower margins, and build internal expertise to handle the particular contractual and technical demands of the media market, which could result in higher operating costs. Implementation issues with our products or those of other vendors have caused, and may continue to cause, delays in project completion for our customers and delay our recognition of revenue.

The impact of economic conditions on certain of our customers and changes in our customers’ deployment plans have adversely affected our business in the past. In 2010, economic conditions in many of the countries in which we sell products were very weak, and global economic conditions and financial markets experienced a severe downturn. The downturn stemmed from a multitude of factors, including adverse credit conditions, slower economic activity, concerns about inflation and deflation, rapid changes in foreign exchange rates, increased energy costs, decreased consumer confidence, reduced corporate profits and capital spending, adverse business conditions and liquidity concerns. Although there was an increase in global economic activity in the second half of 2010 and the first half of 2011, economic growth appears to have become sluggish in some geographies since the middle of 2011, and weak in other geographies, particularly in Europe, since the beginning of 2012. If an economic downturn were to occur in the future, customers may delay or reduce capital expenditures, which often results in lower demand for our products.

As part of our business strategy, (1) from time to time we have acquired, and continue to consider acquiring, businesses, technologies, assets and product lines that we believe complement or may expand our existing business, and (2) from time to time we consider divesting a product line that we believe may no longer complement or expand our existing business. In September 2010, we completed the acquisition of Omneon, Inc., a company specializing in file-based infrastructure for the production, preparation and playout of video content typically deployed by broadcasters, satellite operators, content owners and other media companies. Omneon’s business is complementary to Harmonic’s core business, and expands our customer reach into content providers and extends our product lines into video servers and video-optimized storage for content production and playout. In connection with the acquisition, our operating results for 2010 included related acquisition costs and restructuring expenses. Further, the financial results of Omneon, including the amortization of acquired intangible assets, is included in our results of operations as of the acquisition date, and has had a significant impact on our revenues, cost of revenues, and operating expenses since the date of acquisition. On February 18, 2013, we entered into an agreement to sell our cable access HFC business. See Note 20, “Subsequent Events” of our Consolidated Financial Statements.

CRITICAL ACCOUNTING POLICIES, JUDGMENTS AND ESTIMATES

The preparation of financial statements and related disclosures requires Harmonic to make judgments, assumptions and estimates that affect the reported amounts of assets and liabilities, the disclosure of contingencies and the reported amounts of revenue and expenses in the financial statements and accompanying notes. Material differences may result in the amount and timing of revenue and expenses if different judgments or different estimates were made. See Note 2 of Notes to Consolidated Financial Statements for details of Harmonic’s accounting policies. Critical accounting policies, judgments and estimates that we believe have the most significant impact on Harmonic’s financial statements are set forth below:

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REVENUE RECOGNITION

Harmonic’s principal sources of revenue are from the sale of hardware, software, hardware and software maintenance contracts, and the sale of end-to-end solutions, encompassing design, manufacture, test, integration and installation of products. Harmonic recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been provided, the sale price is fixed or determinable, and collectability is reasonably assured.

We generally use contracts and customer purchase orders to determine the existence of an arrangement. Shipping documents and customer acceptance, when applicable, are used to verify delivery. We assess whether the sales price is fixed or determinable based on the payment terms associated with the transaction and whether the price is subject to refund or adjustment. We assess collectability based primarily on the creditworthiness of the customer, as determined by credit checks and analysis, as well as the customer’s payment history.

Significant management judgments and estimates must be made in connection with determination of the revenue to be recognized in any accounting period. Because of the concentrated nature of our customer base, different judgments or estimates made for any one large contract or customer could result in material differences in the amount and timing of revenue recognized in any particular period.

We have multiple-element revenue arrangements that include hardware and software essential to the hardware product’s functionality. For transactions originating or materially modified beginning January 1, 2011, we apply new accounting guidance on a prospective basis, which requires that we allocate revenue to all deliverables based on their relative selling prices. We determine the relative selling prices by first considering vendor-specific objective evidence of fair value (“VSOE”), if it exists; otherwise third-party evidence (“TPE”) of the selling price is used. When we are unable to establish selling price using VSOE or TPE, we use our best estimate of selling price (“BESP”) in our allocation of arrangement consideration. The objective of BESP is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. BESP is generally used for offerings that are not typically sold on a stand-alone basis or for new or highly customized offerings. The Company’s process for determining BESP involves management’s judgment, and considers multiple factors that may vary over time, depending upon the unique facts and circumstances related to each deliverable. If the facts and circumstances underlying the factors considered change or should future facts and circumstances lead the Company to consider additional factors, the Company’s BESP may also change.

Sales of stand-alone software that are not considered essential to the functionality of the hardware continue to be subject to the industry-specific software revenue recognition guidance. Further, the Company also applied the industry-specific software revenue recognition guidance to its multiple element arrangements for transactions originating prior to January 1, 2011. In accordance with the software revenue recognition guidance, the Company applies the residual method to recognize revenue for the delivered elements in stand-alone software transactions. Under the residual method, the amount of revenue allocated to delivered elements equals the total arrangement consideration, less the aggregate fair value of any undelivered elements, typically maintenance, provided that VSOE of fair value exists for all undelivered elements. We establish fair value by reference to the price the customer is required to pay when an item is sold separately, using contractually stated, substantive renewal rates, when applicable, or the price of recently completed stand alone sales transactions. Accordingly, the determination as to whether appropriate objective and reliable evidence of fair value exists can impact the timing of revenue recognition for an arrangement.

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Solution sales for the design, manufacture, test, integration and installation of products are accounted for in accordance with applicable guidance on accounting for performance of construction/production contracts, using the percentage-of-completion method of accounting when various requirements for the use of this accounting guidance exist. Under the percentage-of-completion method, our revenue recognized reflects the portion of the anticipated contract revenue that has been earned, equal to the ratio of actual labor hours expended to total estimated labor hours to complete the project. Costs are recognized proportionally to the labor hours incurred. Management believes that, for each such project, labor hours expended in proportion to total estimated hours at completion represents the most reliable and meaningful measure for determining a project’s progress toward completion. This requires us to estimate, at the outset of each project, a detailed project plan and associated labor hour estimates for that project. For contracts that include customized services for which labor costs are not reasonably estimable, the Company uses the completed contract method of accounting. Under the completed contract method, 100% of the contract’s revenue and cost is recognized upon the completion of all services under the contract. If the estimated costs to complete a project exceed the total contract amount, indicating a loss, the entire anticipated loss is recognized. Our application of percentage-of-completion accounting is subject to our estimates of labor hours to complete each project. In the event that actual results differ from these estimates or we adjust these estimates in future periods, our operating results, financial position or cash flows for a particular period could be adversely affected.

Revenue on shipments to distributors, resellers and systems integrators is generally recognized on delivery. Allowances are provided for estimated returns and discounts. Such allowances are adjusted periodically to reflect actual and anticipated experience. Distributors and systems integrators purchase our products for specific capital equipment projects of the end-user and do not hold inventory. They perform functions that include importation, delivery to the end-customer, installation or integration, and post-sales service and support. Our agreements with these distributors and systems integrators have terms which are generally consistent with the standard terms and conditions for the sale of our equipment to end users and do not provide for product rotation or pricing allowances, as are typically found in agreements with stocking distributors. We have long-term relationships with most of these distributors and systems integrators and substantial experience with similar sales of similar products. We do have instances of accepting product returns from distributors and system integrators. However, such returns typically occur in instances where the system integrator has designed a product into a project for the end user, but the integrator requests permission to return the component as it does not meet the specific project’s functional requirements. Such returns are made solely at the discretion of the Company, as our agreements with distributors and system integrators do not provide for return rights. We have extensive experience monitoring product returns from our distributors, and, accordingly, we have concluded that the amount of future returns can be reasonably estimated in accordance with applicable accounting guidance. If the actual future returns were to deviate from the historical data on which the reserve had been established, our revenue could be adversely affected.

VALUATION OF INVENTORIES

Harmonic states inventories at the lower of cost, using the weighted average method, or market. We write down the cost of excess or obsolete inventory to net realizable value based on future demand forecasts and historical consumption. If there were to be a sudden and significant decrease in demand for our products, or if there were a higher incidence of inventory obsolescence because of rapidly changing technology and customer requirements, we could be required to record additional charges for excess and obsolete inventory and our gross margin could be adversely affected. Inventory management is of critical importance in order to balance the need to maintain strategic inventory levels to ensure competitive lead times against the risk of inventory obsolescence because of rapidly changing technology and customer requirements. During the years ended December 31, 2012, 2011 and 2010, we recorded excess and obsolete inventory charges of $3.4 million, $3.9 million and $4.2 million, respectively.

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IMPAIRMENT OF GOODWILL OR LONG-LIVED ASSETS

The Company tests for impairment of goodwill on an annual basis in the fourth quarter of its fiscal year at the Company level, which is the sole reporting unit, and at any other time at which events occur or circumstances indicate that the carrying amount of goodwill may exceed its estimated fair value. When assessing the goodwill for impairment, the Company considers its market capitalization adjusted for a control premium and, if necessary, the Company’s discounted cash flow model, which involves significant assumptions and estimates, including the Company’s future financial performance, the Company’s weighted average cost of capital and the Company’s interpretation of currently enacted tax laws. Circumstances that could indicate impairment and require the Company to perform an impairment test include: a significant decline in the financial results of the Company’s operations; the Company’s market capitalization relative to net book value; unanticipated changes in competition and the Company’s market share; significant changes in the Company’s strategic plans; or adverse actions by regulators. We make every effort to estimate future financial performance as accurately as possible with the information available at the time the estimate is developed. However, any change in the assumptions and estimates may affect the estimated fair value of goodwill and could result in an impairment charge in a future period. Identifiable intangible and other long-lived assets are also tested for impairment on the basis of undiscounted cash flows from the asset group when events or changes in circumstances indicate that their carrying amounts may not be recoverable. For example, changes in industry and market conditions or the strategic realignment of our resources could result in an impairment of identified intangibles, goodwill or long-lived assets.

Based on the annual impairment test performed as of December 31, 2012, management determined that the Company’s estimated fair value exceeded the carrying value of its net assets by approximately 21% and that goodwill was not impaired.

We did not record any impairment charges related to our goodwill or long-lived assets during the years ended December 31, 2012, 2011 or 2010. However, there can be no assurance that future impairment tests will not result in a charge to earnings.

At December 31, 2012, our carrying values for goodwill and intangible assets totaled $212.5 million and $58.4 million, respectively.

ASSESSMENT OF THE PROBABILITY OF THE OUTCOME OF CURRENT LITIGATION

Our industry is characterized by the existence of a large number of patents and frequent claims and related litigation regarding patent and other intellectual property rights. In particular, leading companies in the telco industry have extensive patent portfolios. From time to time, third parties have asserted, and may assert in the future, patent, copyright, trademark and other intellectual property rights against us or our customers. We record accruals for loss contingencies when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated.

In October 2011, Avid Technology, Inc. (“Avid”) filed a complaint in the United States District Court for the District of Delaware alleging that Harmonic’s Media Grid product infringes two patents held by Avid. In June 2012, Avid served a subsequent complaint alleging that Harmonic’s Spectrum product infringes one patent held by Avid. The complaints seek injunctive relief and damages.

On November 14, 2012, FastVDO served a lawsuit on Harmonic, alleging infringement of a patent allegedly essential to the H.264 standard and that Harmonic encoders, transcoders, software and servers that use H.264 infringe their patent.

At this time, the Company cannot predict the outcome of the above matters.

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In March 2010, Interkey ELC Ltd, or Interkey, filed a lawsuit in Israel, alleging breach of contract against Harmonic and Scopus Video Networks Ltd. (now Harmonic Video Networks Ltd. or “HVN”), which was acquired by Harmonic in March 2009. The plaintiffs were seeking damages in the amount of 6,300,000 ILS (approximately $1.7 million). On June 26, 2012, the action was dismissed by the Israeli Central District Court.

An unfavorable outcome on the matters referenced above or any other litigation matter could require that Harmonic pay substantial damages, or, in connection with any intellectual property infringement claims, could require that the Company pay ongoing royalty payments or could prevent the Company from selling certain of its products. As a result, a settlement of, or an unfavorable outcome on, any of the matters referenced above or other litigation matters could have a material adverse effect on Harmonic’s business, operating results, financial position and cash flows.

ACCOUNTING FOR INCOME TAXES

In preparing our financial statements, we estimate our income taxes for each of the jurisdictions in which we operate. This involves estimating our actual current tax exposures and assessing temporary differences resulting from differing treatment of items, such as reserves and accruals, for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within our consolidated balance sheet.

Significant management judgment is required in determining our provision for income taxes, our deferred tax assets and liabilities and our future taxable income for purposes of assessing our ability to realize any future benefit from our deferred tax assets. In the event that actual results differ from these estimates or we adjust these estimates in future periods, our operating results and financial position could be materially affected.

We are subject to examination of our income tax returns by various tax authorities on a periodic basis. We regularly assess the likelihood of adverse outcomes resulting from such examinations to determine the adequacy of our provision for income taxes. We apply the provisions of the applicable accounting guidance regarding accounting for uncertainty in income taxes, which requires application of a more-likely-than-not threshold to the recognition and derecognition of uncertain tax positions. If the recognition threshold is met, the applicable accounting guidance permits us to recognize a tax benefit measured at the largest amount of such tax benefit that, in our judgment, is more than fifty percent likely to be realized upon settlement. It further requires that a change in judgment related to the expected ultimate resolution of uncertain tax positions be recognized in earnings in the quarter of such change. Our income tax returns for 2008, 2009 and 2010 are currently under examination by the U.S. Internal Revenue Service. In addition, the statute of limitations on our 2008 U.S. corporate income tax return has been extended to 2013. A subsidiary of the Company is under an audit, which commenced in the first quarter of 2012, by the Israel tax authority for the years 2007 through 2010. If, upon the conclusion of these audits, the ultimate determination of taxes owed in the U.S. or Israel is for an amount in excess of the tax provision we have recorded in the applicable period, our overall tax expense, effective tax rate, operating results and cash flows could be materially and adversely impacted in the period of adjustment.

We file annual income tax returns in multiple taxing jurisdictions around the world. A number of years may elapse before an uncertain tax position is audited and finally resolved. While it is often difficult to predict the final outcome or the timing of resolution of any particular uncertain tax position, we believe that our reserves for income taxes reflect the most likely outcome. We adjust these reserves, as well as the related interest and penalties, in light of changing facts and circumstances. If our estimate of tax liabilities proves to be less than the ultimate assessment, a further charge to expense would result. If payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when we determine the liabilities are no longer necessary. Any changes in estimate, or settlement of any particular position, could have a material impact on our operating results, financial condition and cash flows.

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STOCK-BASED COMPENSATION

Harmonic measures and recognizes compensation expense for all stock-based compensation awards made to employees and directors, including stock options, restricted stock units and share purchase rights related to our Employee Stock Purchase Plan (“ESPP”), based upon the grant-date fair value of those awards. The grant date fair value of restricted stock units is based on the fair value of our common stock on the date of grant. The grant date fair value of our stock options and share purchase rights is estimated using the Black-Scholes option pricing model.

The determination of fair value of stock options and share purchase rights on the date of grant, using an option-pricing model, is affected by our stock price, as well as assumptions regarding a number of highly complex and subjective variables. These variables include our expected stock price volatility over the term of the awards, actual and projected employee stock option exercise behaviors, risk-free interest rates, and expected dividends. We estimated the expected life of the awards based on an analysis of our historical experience of employee exercise and post-vesting termination behavior considered in relation to the contractual life of the options and purchase rights. The risk-free interest rate assumption is based upon observed interest rates appropriate for the expected term of the awards. We do not currently pay cash dividends on our common stock and do not anticipate doing so in the foreseeable future. Accordingly, our expected dividend yield is zero.

Stock-based compensation expense recognized in the Consolidated Statement of Operations is based on awards ultimately expected to vest and therefore has been reduced for estimated forfeitures. The stock-based compensation guidance requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Forfeitures were estimated based on historical experience.

If factors change and we employ different assumptions to determine the fair value of our stock-based compensation awards granted in future periods, the compensation expense that we record under it may differ significantly from what we have recorded in the current period.

See Note 13 and Note 14 of our Consolidated Financial Statements for additional information.

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RESULTS OF OPERATIONS

Net Revenue

Net Revenue — Consolidated

Harmonic’s consolidated net revenue, by product line, for each of the three years ended December 31, 2012, 2011 and 2010, are presented in the table below. Also presented is the related dollar and percentage change in consolidated net revenue, by product line, as compared with the prior year.

The decrease in net revenue in 2012, compared to 2011, was primarily due to a reduction in demand for video processing and production and playout products and, to a lesser extent, edge and access products, primarily in the U.S. and Europe, offset, in part, by an increase in service and support revenue. Our revenues from Europe in 2012 were impacted significantly by the weak economic environment in Europe caused principally by the sovereign debt crisis in many European countries. Service and support revenues are derived primarily from maintenance contracts, as well as professional and integration services and training. The 14.1% increase in services revenues for 2012, compared to 2011, was primarily the result of increased maintenance revenues, driven by new maintenance contracts, and the completion of several large, multi-year projects.

The increase in net revenue in 2011, compared to 2010, was due, in large part, to the revenue contribution resulting from the acquisition of Omneon, which was completed in September 2010. Omneon’s product revenue is included in the production and playout product line above. In addition, our revenue increased due to strong demand for our video processing products, particularly in international markets where Pay TV is growing rapidly. The addition of Omneon product revenue and the growth in video processing product revenue also contributed to the growth in service and support activity related to the associated products, resulting in service and support revenue growth of 37% in 2011, when compared to 2010.

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Net Revenue — Geographic

Harmonic’s domestic and international net revenue, for each of the three years ended December 31, 2012, 2011 and 2010, are presented in the table below. Also presented are the related dollar and percentage change in domestic and international net revenue, as compared with the prior year.

The decrease in U.S. net revenue in 2012, compared to 2011, was principally due to decreased demand for our video processing products and, to a much lesser extent, our production and playout products. International net revenue in 2012 decreased, compared to 2011, primarily due to decreased demand in Europe across all product lines, offset by increased demand in Asia Pacific, largely for our production and playout products. We expect that international sales will continue to account for a significant percentage of our net revenue for the foreseeable future.

The increase in U.S. net revenue in 2011, compared to 2010, was principally due to the addition of Omneon product revenue and, to a lesser extent, increased video processing revenue and service and support revenue. International net revenue in 2011 increased, compared to 2010, primarily due to sales of Omneon production and playout products, given that a substantial majority of production and playout net revenues were international, and, to a lesser extent, increased demand from customers in emerging markets.

Gross Profit

Harmonic’s gross profit and gross profit as a percentage of net revenue, for each of the three years ended December 31, 2012, 2011, and 2010, are presented in the table below. Also presented is the related dollar and percentage change in gross profit, as compared with the prior year.

Gross profit as a percentage of revenue decreased in 2012, compared to 2011. The decrease in gross margin was primarily due to a change in product mix, the continuing competitive pricing environment, and, to a lesser extent, the decrease in net revenue. In 2012 and 2011, approximately $20.5 million and $21.5 million of expense related to amortization of intangibles was included in cost of revenue.

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Gross profit as a percentage of revenue remained relatively flat in 2011, compared to 2010. The increase in gross margin was principally due to the increase in sales of production and playout products, which typically carry a higher gross margin than our average gross margin, offset in part by higher amortization of intangibles. In 2011, $21.5 of amortization of intangibles was included in cost of sales, compared to $12.5 million in 2010. The higher amortization of intangible expense in 2011 was due to the amortization of intangibles arising from the Omneon acquisition, which was completed in September 2010.

Research and Development

Harmonic’s research and development expense and the expense as a percentage of net revenue, for each of the three years ended December 31, 2012, 2011, and 2010, are presented in the table below. Also presented is the related dollar and percentage change in research and development expense, as compared with the prior year.

The increase in research and development expense in 2012, compared to 2011, was primarily the result of increased employee related compensation expense of $1.1 million, and increased outside engineering services and prototype materials costs of $2.1 million, related to new product development initiatives. We expect research and development expense in 2013 to remain relatively flat, compared to 2012.

The increase in research and development expense in 2011, compared to 2010, was primarily the result of increased personnel related expense of $15.0 million, increased outside engineering services of $3.5 million, increased facilities related expenses of $3.0 million and increased stock-based compensation expense of $1.9 million. The increased personnel related expense, outside engineering services and stock-based compensation expense were primarily due to increased engineering headcount and activities resulting from the Omneon acquisition, as well as additional hiring of employees engaged in engineering activities. The increased facilities related expenses were primarily due to additional depreciation of building improvements and lab equipment costs incurred in order to consolidate the Omneon employees within our San Jose headquarters building.

Selling, General and Administrative

Harmonic’s selling, general and administrative expense and the expense as a percentage of net revenue, for each of the three years ended December 31, 2012, 2011, and 2010, are presented in the table below. Also presented is the related dollar and percentage change in selling, general and administrative expense, as compared with the prior year.

Selling, general and administrative expenses in 2012, compared to 2011, remained relatively flat. Increased depreciation expense of $1.1 million and increased professional fees of $0.5 million were offset by decreased third party commission expense of $0.7 million, decreased travel expense of $0.6 million and decreased bad debt

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expenses of $0.2 million. The increase in depreciation expense was primarily due to additional demonstration equipment and software applications for marketing use. The decrease in third party commission expense was largely due to decreased net revenue in 2012, and the decrease in travel expense was largely due to travel cost containment efforts.

The increase in selling, general and administrative expense in 2011, compared to 2010, was primarily a result of increased compensation expense of $14.7 million, increased stock-based compensation expense of $2.6 million, increased program marketing and third party commission expense of $5.1 million, increased travel expense of $3.4 million, increased amortization of intangibles of $4.0 million, and increased consulting and professional service expense of $2.0 million. These increases were partially offset by the absence of $5.7 million of acquisition related costs incurred in 2010 in connection with the acquisition of Omneon and a decrease of $2.5 million of excess facilities charges primarily related to the closure of the Omneon Sunnyvale office in 2010. The increased compensation expense, stock-based compensation expense and travel expense in 2011 were primarily due to increased headcount resulting from the Omneon acquisition and higher commission expense resulting from increased net revenue in 2011. The increase in consulting and professional service expense was related to higher temporary headcount and additional consulting resources being used in general and administrative activities.

Amortization of Intangibles

Harmonic’s amortization of intangibles expense charged to operating expenses and the amortization of intangibles expense as a percentage of net revenue, for each of the three years ended December 31, 2012, 2011, and 2010, are presented in the table below. Also presented is the related dollar and percentage change in amortization of intangibles expense, as compared with the prior year.

The decrease in the amortization of intangibles expense in 2012, compared to 2011, was the result of the completion of the amortization of trademarks acquired as part of a prior business acquisition. The increase in the amortization of intangibles expense in 2011, compared to 2010, was primarily due to the amortization of intangible assets obtained in connection with the acquisition of Omneon during the third quarter of 2010.

Interest Income, Net

Harmonic’s interest income and expense, net as a percentage of net revenue, for each of the three years ended December 31, 2012, 2011, and 2010, are presented in the table below. Also presented is the related dollar and percentage change in interest income, net, as compared with the prior year.

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The increase in interest income, net in 2012, compared to 2011, was primarily due to higher average cash and short-term investments balances during 2012.

The decrease in interest income, net in 2011, compared to 2010, was primarily due to lower average cash and short-term investments balances during 2011, principally resulting from cash used in the Omneon acquisition in September 2010, offset by increases in cash from operations, and lower interest rates earned on the balances.

Other Expense, Net

Other expense, net is primarily comprised of foreign exchange gains and losses on cash, accounts receivable and intercompany balances denominated in currencies other than the U.S. dollar. To mitigate the volatility related to fluctuations in the foreign exchange rates, we may enter into various foreign currency contracts. The (gain) loss on foreign currency is driven by the fluctuations in the foreign currency exchanges rates, primarily the euro, British pound and Japanese yen.

Income Taxes

Harmonic’s provision for income taxes and provision for income taxes as a percentage of net revenue, for each of the three years ended December 31, 2012, 2011, and 2010, are presented in the table below. Also presented is the related dollar and percentage change in provision for income taxes, as compared with the prior year.