Amendment No. 3 to Form S-1

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If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, check the following box. ¨

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

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.

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

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

Zynga Inc. is offering shares of its Class A common stock, and the selling stockholders are offering shares of Class A common stock. We will not receive any proceeds from the sale of shares by the selling stockholders. This is our initial public offering, and no public market currently exists for our shares of Class A common stock. We anticipate that the initial public offering price will be between $ and $ per share.

Following this offering, we will have three classes of authorized common stock, Class A common stock, Class B common stock and Class C common stock. The rights of the holders of each class will be identical, except with respect to voting and conversion. Each share of Class A common stock will be entitled to one vote per share. Each share of Class B common stock will be entitled to seven votes per share. Each share of Class C common stock will be entitled to 70 votes per share. Each share of the Class B common stock and Class C common stock will be convertible at any time into one share of Class A common stock. Outstanding shares of Class B common stock will represent approximately % of the voting power of our outstanding capital stock following this offering, and outstanding shares of Class C common stock, all held by our founder and Chief Executive Officer, Mark Pincus, will represent approximately % of the voting power of our outstanding capital stock following this offering.

We intend to apply to list our Class A common stock on the under the symbol “ .”

Investing in our Class A common stock involves risks. See “Risk Factors” beginning on page 14.

We have granted the underwriters the right to purchase up to an additional shares of Class A common stock to cover over-allotments.

The Securities and Exchange Commission and state securities regulators have not approved or disapproved these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The underwriters expect to deliver the shares of Class A common stock to purchasers on , 2011.

You should rely only on the information contained in this prospectus or contained in any free writing prospectus filed with the Securities and Exchange Commission. Neither we, the selling stockholders, nor the underwriters have authorized anyone to provide you with additional information or information different from that contained in this prospectus or in any free writing prospectus filed with the Securities and Exchange Commission. We and the selling stockholders are offering to sell, and seeking offers to buy, our Class A common stock only in jurisdictions where offers and sales are permitted. The information contained in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or of any sale of our Class A common stock.

Through and including , 2011 (the 25th day after the date of this prospectus), all dealers that effect transactions in these securities, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to the dealers’ obligations to deliver a prospectus when acting as underwriters and with respect to their unsold allotments or subscriptions.

For investors outside of the United States: Neither we, the selling stockholders, nor the underwriters have done anything that would permit this offering or possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than in the United States. You are required to inform yourselves about and to observe any restrictions relating to this offering and the distribution of this prospectus outside of the United States.

References in this prospectus to “DAUs” mean daily active users of our games, “MAUs” mean monthly active users of our games, “MUUs” mean monthly unique users of our games, and “ABPU” means average daily bookings per average DAU. Unless otherwise indicated, these metrics are based on internally-derived measurements across all platforms on which our games are played. For further information about DAUs, MAUs, MUUs and ABPU as measured by us, see the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Metrics—Key Operating Metrics.” We also refer in this prospectus to DAUs and MAUs as measured and published by AppData, an independent service that publicly reports traffic data for games and other applications on Facebook. For further information about DAUs and MAUs as measured by AppData, including an explanation of differences between these metrics as measured by AppData and the corresponding metrics as measured by us, see the section titled “Market Data and User Metrics—User Metrics.”

PROSPECTUS SUMMARY

The following summary highlights information contained elsewhere in this prospectus and does not contain all of the information that you should consider in making your investment decision. Before investing in our Class A common stock, you should carefully read this entire prospectus, including our consolidated financial statements and the related notes included in this prospectus and the information set forth under the headings “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

ZYNGA INC.

Our Vision for Play

We founded Zynga in 2007 with the vision that play—like search, share and shop—would become one of the core activities on the Internet. As a pioneer of online social games, we have made them accessible, social and fun. We are excited that games have grown to become the second most popular online activity in the United States by time spent, even surpassing email. We have a lot of hard work, innovation and growth ahead of us to create a future where social games are a daily habit for nearly everyone.

Our mission is to connect the world through games.

Overview

We are the world’s leading social game developer with 232 million average monthly active users, or MAUs, in 166 countries. We have launched the most successful social games in the industry in each of the last three years and have generated over $1.25 billion in cumulative revenue and over $1.75 billion in cumulative bookings since our inception in 2007. Our games are accessible to players worldwide on Facebook, other social networks and mobile platforms, wherever and whenever they want. Currently, substantially all of our revenue is generated from players accessing our games via the Facebook platform. We operate our games as live services, by which we mean that we continue to support and update games after launch and gather daily, metrics-based player feedback that enables us to continually enhance our games by adding new content and features. All of our games are free to play, and we generate revenue through the in-game sale of virtual goods and advertising.

We believe our leadership position in social games is the result of our significant investment in our people, content, brand, technology and infrastructure. Our leadership position in social games is defined by the following:

Large and Global Community of Players. According to AppData, as of June 30, 2011, we had more MAUs on Facebook than the next 15 social game developers combined. Our players are also more engaged, with our games being played by more than 60 million average daily active users, or DAUs, worldwide as of June 30, 2011. According to AppData, as of June 30, 2011, our games were played by more DAUs than the next 30 social game developers combined.

Leading Portfolio of Social Games. We have many of the most popular and successful online social games, including CityVille, FarmVille, Mafia Wars, Words with Friends and Zynga Poker. Currently, according to AppData, we have four of the top five social games on Facebook based on DAUs. On mobile platforms, we have several of the most popular games, including Words with Friends and Hanging with Friends, which were the top two games in the word category based on the number of downloads from the Apple App Store for iPhone as of June 30, 2011.

Rapid Game Growth. Our games have achieved rapid and widespread adoption. FarmVille grew to 43 million MAUs in its first 100 days and CityVille grew to 61 million MAUs in its first 50 days. One of our newest web-based games, Empires & Allies, grew to be the second most popular game on Facebook, based on MAUs as measured by AppData, less than a month after launch. In June 2011, we launched Hanging with Friends, which became the most downloaded game in the Apple App Store for iPhone during its first week.

Scalable Technology and Data. We process and serve more than a petabyte of content for our players every day, a volume of data that we believe is unmatched in the social game industry. We continually analyze game data to optimize our games. We believe that combining data analytics with creative game design enables us to create a superior player experience.

We leverage our scale to increase player engagement, cross-promote our portfolio of games, continually enhance existing games, launch new games and build the Zynga brand. We believe our scale results in network effects that deliver compelling value to our players, and we are committed to making significant investments that will further grow our community of players, their engagement and our monetization over time.

We have achieved significant growth in our business in a short period of time. From 2008 to 2010, our revenue increased from $19.4 million to $597.5 million, our bookings increased from $35.9 million to $838.9 million, we went from a net loss of $22.1 million to net income of $90.6 million and our adjusted EBITDA increased from $4.5 million to $392.7 million. For the six months ended June 30, 2010 and 2011, our revenue increased from $231.0 million to $522.0 million, our bookings increased from $373.0 million to $561.3 million, our net income decreased from $20.4 million to $18.1 million and our adjusted EBITDA decreased from $187.3 million to $177.3 million. For a discussion of the limitations associated with using bookings and adjusted EBITDA rather than GAAP measures and a reconciliation of these measures to revenue and net income (loss), see the section titled “Summary Consolidated Financial Data—Non-GAAP Financial Measures.”

Consistent with our “free-to-play” business model, historically less than 5% of our players have been paying players. Because the opportunity for social interactions increases as the number of players increases, we believe that maintaining and growing our overall number of players, including the number of players who may not purchase virtual goods, is important to the success of our business. As a result, we believe that the number of players who choose to purchase virtual goods will continue to constitute a small percentage of our overall players as our business grows.

Our top three games historically have contributed the majority of our revenue. Our top three games accounted for 93%, 83%, 78% and 59% of our online game revenue in 2008, 2009, 2010, and for the six months ended June 30, 2011, respectively.

Our Opportunity

Our opportunity is being driven by the confluence of three primary trends regarding how people use, communicate through and socialize on the Internet:

Growth of Social Networks. Over the past decade, social networks have emerged as mainstream platforms that enable people to connect with each other online, share information and enjoy experiences with their friends and families. IDC, a market research firm, estimates that there will be approximately 1.1 billion users of social networks globally, including over 750 million active users on Facebook, in 2011. IDC forecasts that the number of users on social networks globally will grow to 1.6 billion by 2014.

Emergence of the App Economy. In order to provide users with a wider range of engaging experiences, social networks and mobile operating systems have opened their platforms to developers, transforming the creation, distribution and consumption of digital content. We refer to this as the “App Economy.” In

the App Economy, developers can create applications accessing unique features of the platforms, distribute applications digitally to a broad audience and regularly update existing applications.

Rapid Growth of Free-to-Play Games. Most social games are free to play and generate revenue through the in-game sale of virtual goods. According to In-Stat, a market intelligence firm, the worldwide market for the sale of virtual goods was $7.3 billion in 2010 and is expected to more than double by 2014. Compared to pay-to-play business models, the free-to-play approach tends to attract a wider audience of players, thereby increasing the number of players who have the potential to become paying users. By attracting a larger audience, the free-to-play model also enables a higher degree of in-game social interaction, which enhances the game experience for all players.

We believe social games represent a new form of entertainment that will continue to capture an increasing proportion of consumer leisure time. In addition, social games are the most popular applications on Facebook and we believe they have been, and will continue to be, a key driver of engagement on social networks, and increasingly on mobile platforms. As consumers gravitate toward more social forms of online entertainment, we believe that social games will capture an increasing portion of the overall $52 billion video game software market, as estimated for 2011 by IDC, as well as the global entertainment market.

Our Player-Centric Approach

We believe that a player-centric approach is the key to our continued success. We design our games to be:

Accessible by Everyone, Anywhere, Any Time. Our games are easy to learn, playable in short sessions and accessible on multiple platforms. We operate our games as live services that can be played anytime and anywhere.

Social. We believe games are most engaging and fun when they are social. We have devoted significant efforts to providing our community of players with simple ways to find their friends online and connect, play and share with them.

Free. Our free-to-play approach attracts a larger audience than a traditional pay-to-play approach. This enables a higher degree of social interaction and improves the game experience for all players. Our players can choose to purchase virtual goods to enhance their game experience.

Fun. We keep our games fun and engaging by regularly delivering new content, features, quests, challenges and virtual goods that enhance the experience for our players.

Supportive of Social Good. Our players are able to enjoy fun social games while also contributing to charitable causes that they support through the purchase of special virtual goods.

Our Core Strengths

We believe the following strengths provide us with competitive advantages:

Deep Base of Talent. Our unique company culture serves as the foundation of our success and helps us attract, grow and retain world class talent. We believe our culture and success to date have made us an employer of choice amongst innovators in our industry.

Large and Global Community of Players. We have 232 million average MAUs in 166 countries. According to AppData, as of June 30, 2011, we had more MAUs on Facebook than the next 15 social game developers combined.

Leading Portfolio of High Quality Social Games. Our portfolio of games includes many of the most popular and successful social games on social networks and mobile platforms, including CityVille, FarmVille, Mafia Wars, Words with Friends and Zynga Poker. As of June 30, 2011, we had the top five games on Facebook, based on DAUs, as measured by AppData.

Sophisticated Data Analytics. The extensive engagement of our players provides over 15 terabytes of game data per day that we use to enhance our games by designing, testing and releasing new features on an ongoing basis.

Scalable Technology Infrastructure and Game Engines. We have invested extensively in developing proprietary technology to support the growth of our business. We have developed a flexible game engine that we leverage for the development and launch of new games. With each release, we add features and functionality to improve our core code base for future game development.

Powerful Network Effects. Because of our large community, our players are more likely to find and connect with others to play and build relationships. Our games are more social and fun as more people play them, creating an incentive for existing players to encourage their friends and family to play.

Our Key Metrics

We measure our business by using several key financial metrics, which include bookings and adjusted EBITDA, and operating metrics, which include DAUs, MAUs, MUUs and ABPU. Our operating metrics help us to understand and measure the engagement levels of our players, the size of our audience, our reach and overall monetization of our players.

For a description of how we calculate each of our key metrics and factors that have caused fluctuations in these metrics, see the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Metrics.”

The charts and the table below show the metrics for the 10 quarters indicated:

LOGO


	For the Three Months Ended
	Mar 31, 2009		Jun 30, 2009		Sep 30, 2009		Dec 31, 2009		Mar 31, 2010		Jun 30, 2010		Sep 30, 2010		Dec 31, 2010		Mar 31, 2011		Jun 30, 2011
	(users in millions)
Average DAUs		NA		NA		24		58		67		60		49		48		62		59
Average MAUs		NA		NA		99		207		236		234		203		195		236		228
Average MUUs		NA		NA		63		110		124		119		110		111		146		151
ABPU		NA		NA	$	0.044	$	0.027	$	0.030	$	0.036	$	0.049	$	0.055	$	0.051	$	0.051

NA means data is not available.

Our Strategy

Our mission is to connect the world through games. In pursuit of our mission, we encourage entrepreneurship and intelligent risk taking to produce breakthrough innovations, which we call bold beats. The key elements of our strategy are:

Make Games Accessible and Fun. We operate our games as live services that are available anytime and anywhere. We design our social games to provide players with easy access to shared experiences that delight, amuse and entertain, and we will continue to update our games on an ongoing basis with fresh content and new features to make them more social and fun for our players.

Enhance Existing Franchises. We will continue to enhance our market-leading franchises including CityVille, FarmVille, FrontierVille, Words with Friends and Zynga Poker. We regularly update our games after launch to encourage social interactions, add new content and features and improve monetization.

Launch New Games. We will continue to invest in building new games to expand the genres of games that we offer, further engage with our existing players and attract new players. For example, in June 2011, we launched Empires & Allies, a strategy combat game, which within its first month, became the second most played game on Facebook based on MAUs, as measured by AppData.

Continue Mobile Growth. We believe there is a large opportunity to extend our brand and games to mobile platforms such as Apple iOS and Google Android. We will continue to make our games accessible on a large number of mobile and other Internet-connected devices and invest in developing and acquiring mobile development talent, technologies and content.

Continue International Growth. We intend to expand our international audience by making more of our games available in multiple languages, creating more localized game content and partnering with leading international social networking sites and mobile partners. We believe we have a significant opportunity to better monetize our games in international markets as we offer more targeted virtual goods and additional payment options.

Extend Our Technology Leadership Position. Our proprietary technology stack and data analytics are competitive advantages that enhance our ability to create the world’s best social games. We will continue to innovate and optimize our network infrastructure to cost-effectively ensure high performance and high availability of our social games. We believe continued investments in infrastructure and systems will allow us to extend our technology leadership.

Increase Monetization of Our Games. We strive to offer increased selection, better merchandising and more payment options to increase the sales of our virtual goods. Our players purchase these virtual goods to extend their play sessions, personalize their game environments, accelerate their progress and send unique gifts to their friends. We will also continue to pursue additional revenue opportunities from advertising, including branded virtual goods and sponsorships.

Risks Associated with Our Business

Our business is subject to numerous risks and uncertainties, including those highlighted in the section titled “Risk Factors” immediately following this prospectus summary. Some of these risks are:

if we are unable to maintain a good relationship with Facebook, our business will suffer;

we operate in a new and rapidly changing industry, which makes it difficult to evaluate our business and prospects;

we have a new business model and a short operating history, which makes it difficult to evaluate our prospects and future financial results and may increase the risk that we will not be successful;

we rely on a small percentage of our players for nearly all of our revenue;

a small number of games have generated a majority of our revenue, and we must continue to launch and enhance games that attract and retain a significant number of players in order to grow our revenue and sustain our competitive position;

a significant majority of our game traffic is hosted by a single vendor, and any failure or significant interruption in our network could impact our operations and harm our business;

security breaches, computer viruses and computer hacking attacks could harm our business and results of operations;

if we fail to effectively manage our growth, our business and operating results could be harmed;

our growth prospects will suffer if we are unable to develop successful games for mobile platforms;

expansion into international markets is important for our growth, and as we expand internationally, we face additional business, political, regulatory, operational, financial and economic risks, any of which could increase our costs and hinder such growth; and

the three class structure of our common stock has the effect of concentrating voting control with those stockholders who held our stock prior to this offering, including our founder and Chief Executive Officer and our other executive officers, employees and directors and their affiliates; this will limit your ability to influence corporate matters.

Corporate Information

We were originally organized in April 2007 as a California limited liability company under the name Presidio Media LLC, and we converted to a Delaware corporation in October 2007. We changed our name to Zynga Inc. in November 2010. Our principal executive offices are located at 699 Eighth Street, San Francisco, CA 94103, and our telephone number is (800) 762-2530. Our website address is www.zynga.com. Information contained on our website is not a part of this prospectus, and the inclusion of our website address in this prospectus is an inactive textual reference only. Unless the context requires otherwise, the words “Zynga,” “we,” “company,” “us” and “our” refer to Zynga Inc. and its subsidiaries.

Zynga, the Zynga logo and other trademarks or service marks of Zynga appearing in this prospectus are the property of Zynga. Trade names, trademarks and service marks of other companies appearing in this prospectus are the property of their respective holders.

THE OFFERING

Class A common stock offered

By us

By the selling stockholders

Total

Class A common stock to be outstanding after this offering

Class B common stock to be outstanding after this offering

Class C common stock to be outstanding after this offering

Total Class A, Class B and Class C common stock to be outstanding after this offering

Over-allotment option

Use of proceeds

We intend to use the net proceeds to us from this offering for general corporate purposes, including working capital, game development, marketing activities and capital expenditures. We intend to use approximately $ million of the net proceeds to satisfy tax withholding obligations related to the vesting of restricted stock units, or ZSUs, in connection with this offering. In addition, we may use a portion of the proceeds from this offering for acquisitions of or investments in complementary businesses, technologies or other assets. We also intend to contribute a portion of the net proceeds to charitable causes through Zynga.org, our philanthropic initiative. We will not receive any of the proceeds from the sale of shares to be offered by the selling stockholders. See “Use of Proceeds.”

Risk factors

See “Risk Factors” beginning on page 14 and the other information included in this prospectus for a discussion of factors you should carefully consider before deciding to invest in our Class A common stock.

Proposed symbol

The number of shares of Class A common stock, Class B common stock and Class C common stock to be outstanding after this offering is based on no shares of our Class A common stock, 565,056,979 shares of our Class B common stock (including preferred stock on an as-converted basis) and 20,517,472 shares of our Class C common stock outstanding as of June 30, 2011, and excludes:

110,617,792 shares of Class B common stock issuable upon the exercise of stock options outstanding as of June 30, 2011 under our 2007 Equity Incentive Plan at a weighted-average exercise price of $0.91 per share;

93,661,941 shares of Class B common stock issuable upon the vesting of restricted stock units, or ZSUs, outstanding as of June 30, 2011 under our 2007 Equity Incentive Plan;

18,854,848 shares of Class B common stock issuable upon the exercise of warrants outstanding as of June 30, 2011 at a weighted-average exercise price of $0.0246 per share, which warrants are expected to remain outstanding after this offering;

8,442,072 shares of Class B common stock reserved for future issuance under our 2007 Equity Incentive Plan; provided, however, that immediately upon the signing of the underwriting agreement for this offering, our 2007 Equity Incentive Plan will terminate so that no further awards may be granted under our 2007 Equity Incentive Plan;

shares of Class A common stock reserved for future issuance under our 2011 Equity Incentive Plan, which we plan to adopt in connection with this offering; and

8,500,000 shares of Class A common stock reserved for future issuance under our 2011 Employee Stock Purchase Plan, which we plan to adopt in connection with this offering.

Unless we specifically state otherwise, the share information in this prospectus is as of June 30, 2011 and reflects or assumes:

the net issuance of shares of Class B common stock upon the vesting of outstanding ZSUs in connection with this offering;

the filing of our amended and restated certificate of incorporation on September 14, 2011 to (i) redesignate our previously outstanding Class A common stock and Class B common stock as “Class B common stock” and “Class C common stock,” respectively, (ii) create a new class of Class A common stock to be offered and sold in this offering and (iii) create a new series of “blank check” preferred stock;

the filing of our amended and restated certificate of incorporation at the closing of this offering to, among other things, eliminate the various series of our preferred stock currently outstanding;

the automatic conversion of all outstanding shares of our preferred stock into an aggregate of 303,663,143 shares of Class B common stock immediately prior to the closing of this offering; and

no exercise of the underwriters’ over-allotment option to purchase up to an additional shares of Class A common stock.

SUMMARY CONSOLIDATED FINANCIAL DATA

The following tables summarize our consolidated financial data and should be read together with our consolidated financial statements and related notes, as well as the sections titled “Selected Consolidated Financial Data” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” appearing elsewhere in this prospectus.

We have derived the consolidated statements of operations data for the years ended December 31, 2008, 2009 and 2010 and the consolidated balance sheet data as of December 31, 2009 and 2010 from our audited consolidated financial statements appearing elsewhere in this prospectus. The consolidated statements of operations data for the six months ended June 30, 2010 and 2011 and consolidated balance sheet data as of June 30, 2011 have been derived from our unaudited consolidated financial statements appearing elsewhere in this prospectus. We have prepared the unaudited financial data on the same basis as the audited consolidated financial statements. We have included, in our opinion, all adjustments, consisting only of normal recurring adjustments, that we consider necessary for a fair presentation of the financial information set forth in those statements. Our historical results are not necessarily indicative of the results that should be expected in the future, and our interim results are not necessarily indicative of the results that should be expected for the full year.


	Year Ended December 31,									Six Months Ended June 30,
	2008			2009			2010			2010			2011
	(in thousands, except per share data)
Consolidated Statements of Operations Data:
Revenue	$	19,410		$	121,467		$	597,459		$	231,026		$	522,034

Costs and expenses:
Cost of revenue		10,017			56,707			176,052			74,547			145,738
Research and development		12,160			51,029			149,519			58,237			167,507
Sales and marketing		10,982			42,266			114,165			46,928			78,254
General and administrative		8,834			24,243			32,251			31,582			81,328

Total costs and expenses		41,993			174,245			471,987			211,294			472,827
Income (loss) from operations		(22,583	)		(52,778	)		125,472			19,732			49,207
Interest income		319			177			1,222			303			961
Other income (expenses), net		187			(209	)		365			1,531			(536	)

Income (loss) before income taxes		(22,077	)		(52,810	)		127,059			21,566			49,632
Provision for income taxes		(38	)		(12	)		(36,464	)		(1,180	)		(31,483	)

Net income (loss)	$	(22,115	)	$	(52,822	)	$	90,595		$	20,386		$	18,149

Deemed dividend to a Series B-2 convertible preferred stockholder		—			—			4,590			4,590			—
Net income attributable to participating securities		—			—			58,110			11,826			18,149

Net income (loss) attributable to Class B and Class C common stockholders⁽¹⁾	$	(22,115	)	$	(52,822	)	$	27,895		$	3,970		$	—

Net income (loss) per share attributable to Class B and Class C common stockholders⁽¹⁾:
Basic	$	(0.18	)	$	(0.31	)	$	0.12		$	0.02		$	0.00

Diluted	$	(0.18	)	$	(0.31	)	$	0.11		$	0.02		$	0.00

Weighted-average common shares used to compute net income (loss) per share attributable to Class B and Class C common stockholders⁽¹⁾:
Basic		119,990			171,751			223,881			207,536			260,414

Diluted		119,990			171,751			329,256			315,054			260,414

Pro forma net income (loss) per share attributable to Class B and Class C common stockholders⁽¹⁾⁽²⁾:
Basic							$						$

Diluted							$						$


	Year Ended December 31,						Six Months Ended June 30,
	2008		2009		2010		2010		2011
	(dollars in thousands, except ABPU data)
Other Financial and Operational Data:
Bookings⁽³⁾	$	35,948	$	328,070	$	838,896	$	373,014	$	561,341
Adjusted EBITDA⁽⁴⁾	$	4,549	$	168,187	$	392,738	$	187,346	$	177,343
Average DAUs (in millions)⁽⁵⁾		NA		41		56		64		60
Average MAUs (in millions)⁽⁶⁾		NA		153		217		235		232
Average MUUs (in millions)⁽⁷⁾		NA		86		116		121		149
ABPU⁽⁸⁾		NA	$	0.035	$	0.041	$	0.033	$	0.051

NA means data is not available.

(1)

Net income attributable to common stock was not allocated to Class A common shares, as there were no shares authorized or outstanding during the periods presented. See Note 9 of the consolidated financial statements for further details on the calculation of basic and diluted net income (loss) per share attributable to each class of common stock.

(2)

See Note 9 of consolidated financial statements for a discussion and reconciliation of the weighted-average common shares outstanding for pro forma net income per share calculations.

(3)

See the section titled “—Non-GAAP Financial Measures” below for how we define and calculate bookings, a reconciliation between bookings and revenue (the most directly comparable GAAP financial measure) and a discussion about the limitations of bookings and adjusted EBITDA.

(4)

See the section titled “—Non-GAAP Financial Measures” below as to how we define and calculate adjusted EBITDA and for a reconciliation between adjusted EBITDA and net income (loss), the most directly comparable GAAP financial measure and a discussion about the limitations of bookings and adjusted EBITDA.

(5)

DAUs is the number of individuals who played one of our games during a particular day, as recorded by our internal analytics systems. Average DAUs is the average of the DAUs for each day during the period reported. See the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Metrics—Key Operating Metrics—DAUs” for more information as to how we define and calculate DAUs. Reflects 2009 data commencing on July 1, 2009.

(6)

MAUs is the number of individuals who played a particular game during a 30-day period, as recorded by our internal analytics systems. Average MAUs is the average of the MAUs at each month-end during the period reported. See the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Metrics—Key Operating Metrics—MAUs” for more information as to how we define and calculate MAUs. Reflects 2009 data commencing on July 1, 2009.

(7)

MUUs is the number of unique individuals who played any of our games on a particular platform during a 30-day period, as recorded by our internal analytics systems. Average MUUs is the average of the MUUs at each month-end during the period reported. See the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Metrics—Key Operating Metrics—MUUs” for more information as to how we define and calculate MUUs. Reflects 2009 data commencing on July 1, 2009.

(8)

ABPU is defined as (i) our total bookings in a given period, divided by (ii) the number of days in that period, divided by (iii) the average DAUs during the period. See the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Metrics—Key Operating Metrics—ABPU” for more information as to how we define and calculate ABPU. Reflects 2009 data commencing on July 1, 2009.


	As of December 31,					As of June 30, 2011
	2009			2010		Actual		As Adjusted⁽¹⁾⁽²⁾
	(in thousands)
Consolidated Balance Sheet Data:
Cash, cash equivalents and marketable securities	$	199,958		$	738,090	$	964,460
Property and equipment, net		34,827			74,959		171,697
Working capital		(12,496	)		385,564		503,428
Total assets		258,848			1,112,572		1,489,480
Deferred revenue		223,799			465,236		504,543
Total stockholders’ equity (deficit)		(21,478	)		482,215		755,896

(1)

Reflects (i) the use of approximately $ million of the net proceeds to satisfy tax withholding obligations related to the vesting of outstanding ZSUs in connection with this offering and (ii) the sale by us of shares of our Class A common stock offered by this prospectus at an assumed initial public offering price of $ per share, which is the midpoint of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us.

(2)

Each $1.00 increase (decrease) in the assumed initial public offering price of $ per share would increase (decrease) the amount of cash, cash equivalents and marketable securities, working capital, total assets and total stockholders’ equity (deficit) by approximately $ million, assuming the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions. Similarly, each increase (decrease) of shares in the number of shares of our Class A common stock offered by us would increase (decrease) the amount of cash, cash equivalents and marketable securities, working capital, total assets and total stockholders’ equity (deficit) by approximately $ million, assuming that the assumed initial public offering price remains the same and after deducting underwriting discounts and commissions. The as adjusted information discussed above is illustrative only and will be adjusted based on the actual public offering price and other terms of this offering determined at pricing.

Non-GAAP Financial Measures

Bookings

To provide investors with additional information about our financial results, we disclose within this prospectus bookings, a non-GAAP financial measure. We have provided below a reconciliation between bookings and revenue, the most directly comparable GAAP financial measure.

Bookings is a non-GAAP financial measure that we define as the total amount of revenue from the sale of virtual goods in our online games and from advertising that would have been recognized in a period if we recognized all revenue immediately at the time of the sale. We record the sale of virtual goods as deferred revenue and then recognize that revenue over the estimated average life of the purchased virtual goods or as the virtual goods are consumed. Advertising revenue consisting of certain branded virtual goods and sponsorships is also deferred and recognized over the estimated average life of the branded virtual good, similar to online game revenue. Bookings is calculated as revenue recognized in a period plus the change in deferred revenue during the period. For additional discussion of the estimated average life of virtual goods, see the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Revenue Recognition.”

We use bookings as one factor to evaluate the results of our operations, generate future operating plans and assess the performance of our company. While we believe that this non-GAAP financial measure is useful in evaluating our business, this information should be considered as supplemental in nature and is not meant as a substitute for revenue recognized in accordance with GAAP. In addition, other companies, including companies in our industry, may calculate bookings differently or not at all, which reduces its usefulness as a comparative measure.

The following table presents a reconciliation of revenue to bookings for each of the periods presented:


	Year Ended December 31,						Six Months Ended June 30,
	2008		2009		2010		2010		2011
	(in thousands)
Reconciliation of Revenue to Bookings:
Revenue	$	19,410	$	121,467	$	597,459	$	231,026	$	522,034
Change in deferred revenue		16,538		206,603		241,437		141,988		39,307

Bookings	$	35,948	$	328,070	$	838,896	$	373,014	$	561,341

Adjusted EBITDA

To provide investors with additional information about our financial results, we disclose within this prospectus adjusted EBITDA, a non-GAAP financial measure. We have provided below a reconciliation between adjusted EBITDA and net income (loss), the most directly comparable GAAP financial measure.

We have included adjusted EBITDA in this prospectus because it is a key measure we use to evaluate our operating performance, generate future operating plans and make strategic decisions for the allocation of capital. Accordingly, we believe that adjusted EBITDA provides useful information to investors and others in understanding and evaluating our operating results in the same manner as our management and board of directors. While we believe that this non-GAAP financial measure is useful in evaluating our business, this information should be considered as supplemental in nature and is not meant as a substitute for the related financial information prepared in accordance with GAAP.

The following table presents a reconciliation of net income (loss) to adjusted EBITDA for each of the periods indicated:


	Year Ended December 31,									Six Months Ended June 30,
	2008			2009			2010			2010			2011
	(in thousands)
Reconciliation of Net Income (Loss) to Adjusted EBITDA:
Net income (loss)	$	(22,115	)	$	(52,822	)	$	90,595		$	20,386		$	18,149
Provision for income taxes		38			12			36,464			1,180			31,483
Other income (expense), net		(187	)		209			(365	)		(1,531	)		536
Interest income		(319	)		(177	)		(1,222	)		(303	)		(961	)
Gain (loss) from legal settlements		7,000			—			(39,346	)		—			—
Depreciation and amortization		2,905			10,372			39,481			15,050			41,212
Stock-based compensation		689			3,990			25,694			10,576			47,617
Change in deferred revenue		16,538			206,603			241,437			141,988			39,307

Adjusted EBITDA	$	4,549		$	168,187		$	392,738		$	187,346		$	177,343

Limitations of Bookings and Adjusted EBITDA

Some limitations of bookings and adjusted EBITDA are:

adjusted EBITDA does not include the impact of equity-based compensation;

bookings and adjusted EBITDA do not reflect that we defer and recognize revenue over the estimated average life of virtual goods or as virtual goods are consumed;

adjusted EBITDA does not reflect income tax payments that may represent a reduction in cash available to us;

adjusted EBITDA does not include other income and expense, which includes foreign exchange gains and losses;

adjusted EBITDA excludes depreciation and amortization and although these are non-cash charges, the assets being depreciated and amortized may have to be replaced in the future;

adjusted EBITDA does not include gains and losses associated with legal settlements; and

other companies, including companies in our industry, may calculate bookings and adjusted EBITDA differently or not at all, which reduces their usefulness as a comparative measure.

Because of these limitations, you should consider bookings and adjusted EBITDA along with other financial performance measures, including revenue, net income (loss) and our financial results presented in accordance with GAAP.

Investing in our Class A common stock involves a high degree of risk. You should carefully consider the risks and uncertainties described below, together with all of the other information in this prospectus, including our consolidated financial statements and related notes, before deciding whether to purchase shares of our Class A common stock. If any of the following risks are realized, our business, operating results, financial condition and prospects could be materially and adversely affected. In that event, the price of our Class A common stock could decline, and you could lose part or all of your investment.

If we are unable to maintain a good relationship with Facebook, our business will suffer.

Facebook is the primary distribution, marketing, promotion and payment platform for our games. We generate substantially all of our revenue and players through the Facebook platform and expect to continue to do so for the foreseeable future. Any deterioration in our relationship with Facebook would harm our business and adversely affect the value of our Class A common stock.

We are subject to Facebook’s standard terms and conditions for application developers, which govern the promotion, distribution and operation of games and other applications on the Facebook platform. We have entered into an addendum to these terms and conditions pursuant to which we have agreed to use Facebook Credits, Facebook’s proprietary payment method, as the primary means of payment within our games played through Facebook. This addendum expires in May 2015.

We have benefited from Facebook’s strong brand recognition and large user base. If Facebook loses its market position or otherwise falls out of favor with Internet users, we would need to identify alternative channels for marketing, promoting and distributing our games, which would consume substantial resources and may not be effective. In addition, Facebook has broad discretion to change its terms of service and other policies with respect to us and other developers, and those changes may be unfavorable to us. For example, in 2010 Facebook adopted a policy requiring applications on Facebook accept only its virtual currency, Facebook Credits, as payment from users. As a result of this change, which we completed in April 2011, Facebook receives a greater share of payments made by our players than it did when other payment options were allowed. Facebook may also change its fee structure, add fees associated with access to and use of the Facebook platform, change how the personal information of its users is made available to application developers on the Facebook platform or restrict how Facebook users can share information with friends on their platform. Beginning in early 2010, Facebook changed its policies for application developers regarding use of its communication channels. These changes limited the level of communication among users about applications on the Facebook platform. As a result, the number of our players on Facebook declined. Any such changes in the future could significantly alter how players experience our games or interact within our games, which may harm our business.

We operate in a new and rapidly changing industry, which makes it difficult to evaluate our business and prospects.

Social games, from which we derive substantially all of our revenue, is a new and rapidly evolving industry. The growth of the social game industry and the level of demand and market acceptance of our games are subject to a high degree of uncertainty. Our future operating results will depend on numerous factors affecting the social game industry, many of which are beyond our control, including:

Our ability to plan for game development, distribution and promotional activities will be significantly affected by our ability to anticipate and adapt to relatively rapid changes in the tastes and preferences of our current and potential players. New and different types of entertainment may increase in popularity at the expense of social games. A decline in the popularity of social games in general, or our games in particular would harm our business and prospects.

We have a new business model and a short operating history, which makes it difficult to evaluate our prospects and future financial results and may increase the risk that we will not be successful.

We began operations in April 2007, and we have a short operating history and a new business model, which makes it difficult to effectively assess our future prospects. Our business model is based on offering games that are free to play. To date, only a small percentage of our players pay for virtual goods. You should consider our business and prospects in light of the challenges we face, including the ones discussed in this section.

We rely on a small percentage of our players for nearly all of our revenue.

Historically, less than 5% of our players have been paying players. We lose players in the ordinary course of business. In order to sustain our revenue levels, we must attract, retain and increase the number of players or more effectively monetize our players. To retain players, we must devote significant resources so that the games they play retain their interest and attract them to our other games. If we fail to grow or sustain the number of our players, or if the rates at which we attract and retain players declines or if the average amount our players pay declines, our business may not grow, our financial results will suffer, and our stock price may decline.

A small number of games have generated a majority of our revenue, and we must continue to launch and enhance games that attract and retain a significant number of players in order to grow our revenue and sustain our competitive position.

Historically we have depended on a small number of games for a majority of our revenue and we expect that this dependency will continue for the foreseeable future. Our growth depends on our ability to consistently launch new games that achieve significant popularity. Each of our games requires significant engineering, marketing and other resources to develop, launch and sustain via regular upgrades and expansions, and such costs on average have increased. Our ability to successfully launch, sustain and expand games and attract and retain players largely depends on our ability to:

It is difficult to consistently anticipate player demand on a large scale, particularly as we develop new games in new genres or new markets, including international markets and mobile platforms. If we do not successfully launch games that attract and retain a significant number of players and extend the life of our existing games, our market share, reputation and financial results will be harmed.

If our top games do not continue to be popular, our results of operations could be harmed.

In addition to creating new games that are attractive to a significant number of players, we must extend the life of our games, in particular our most successful games. For a game to remain popular, we must constantly enhance, expand or upgrade the game with new features that players find attractive. Such constant enhancement requires the investment of significant resources, particularly with older games and such costs on average have increased. We may not be able to successfully enhance, expand or upgrade our current games. Any reduction in the number of players of our most popular games, any decrease in the popularity of our games or social games in general, any breach of game-related security or prolonged server interruption, any loss of rights to any intellectual property underlying such games, or any other adverse developments relating to our most popular games, could harm our results of operations.

A significant majority of our game traffic is hosted by a single vendor and any failure or significant interruption in our network could impact our operations and harm our business.

Our technology infrastructure is critical to the performance of our games and to player satisfaction. Our games run on a complex distributed system, or what is commonly known as cloud computing. We own, operate and maintain elements of this system, but significant elements of this system are operated by third parties that we do not control and which would require significant time to replace. We expect this dependence on third parties to continue. In particular, a significant majority of our game traffic is hosted by Amazon Web Services, or AWS. In August 2011, AWS hosted approximately two-thirds of our game traffic. AWS provides us with computing and storage capacity pursuant to an agreement that continues until terminated by either party. AWS may terminate the agreement without cause by providing 180 days prior written notice, and may terminate the agreement with 30 days prior written notice for cause, including any material default or breach of the agreement by us that we do not cure within the 30 day period. The agreement requires AWS to provide us their standard computing and storage capacity and related support in exchange for timely payment by us. We have experienced, and may in the future experience, website disruptions, outages and other performance problems due to a variety of factors, including infrastructure changes, human or software errors and capacity constraints. For example, the operation of a few of our significant games, including FarmVille and CityVille, was interrupted for several hours in April 2011 due to a network outage. If a particular game is unavailable when players attempt to access it or navigation through a game is slower than they expect, players may stop playing the game and may be less likely to return to the game as often, if at all. A failure or significant interruption in our game service would harm our reputation and operations. We expect to continue to make significant investments to our technology infrastructure to maintain and improve all aspects of player experience and game performance. To the extent that our disaster recovery systems are not adequate, or we do not effectively address capacity constraints, upgrade our systems as needed and continually develop our technology and network architecture to accommodate increasing traffic, our business and operating results may suffer. We do not maintain insurance policies covering losses relating to our systems and we do not have business interruption insurance.

Security breaches, computer viruses and computer hacking attacks could harm our business and results of operations.

Security breaches, computer malware and computer hacking attacks have become more prevalent in our industry, have occurred on our systems in the past and may occur on our systems in the future. Any security breach caused by hacking, which involves efforts to gain unauthorized access to information or systems, or to cause intentional malfunctions or loss or corruption of data, software, hardware or other computer equipment, and the inadvertent transmission of computer viruses could harm our business, financial condition and operating results. We have experienced and will continue to experience hacking attacks. Because of our prominence in the social game industry, we believe we are a particularly attractive target for hackers. Though it is difficult to determine what harm may directly result from any specific interruption or breach, any failure to maintain performance, reliability, security and availability of our network infrastructure to the satisfaction of our players may harm our reputation and our ability to retain existing players and attract new players.

If we fail to effectively manage our growth, our business and operating results could be harmed.

We continue to experience rapid growth in our headcount and operations, which will continue to place significant demands on our management and our operational, financial and technological infrastructure. As of June 30, 2011, approximately 63% of our employees had been with us for less than one year and approximately 90% for less than two years. As we continue to grow, we must expend significant resources to identify, hire, integrate, develop and motivate a large number of qualified employees. If we fail to effectively manage our hiring needs and successfully integrate our new hires, our ability to continue launching new games and enhance existing games could suffer.

To effectively manage the growth of our business and operations, we will need to continue spending significant resources to improve our technology infrastructure, our operational, financial and management controls, and our reporting systems and procedures by, among other things:

These enhancements and improvements will require significant capital expenditures and allocation of valuable management and employee resources. If we fail to implement these enhancements and improvements effectively, our ability to manage our expected growth and comply with the rules and regulations that are applicable to public reporting companies will be impaired. In addition, if our operating costs are higher than we expect or if we do not maintain adequate control of our costs and expenses, our operating results will suffer.

Our growth prospects will suffer if we are unable to develop successful games for mobile platforms.

We have limited experience developing games for mobile platforms. We expect to devote substantial resources to the development of our mobile games, and our limited experience makes it difficult to know whether we will succeed in developing such games that appeal to players or advertisers. The uncertainties we face include:

These and other uncertainties make it difficult to know whether we will succeed in developing commercially viable games for mobile. If we do not succeed in doing so, our growth prospects will suffer.

Our core values of focusing on our players first and acting for the long term may conflict with the short-term interests of our business.

One of our core values is to focus on surprising and delighting our players, which we believe is essential to our success and serves the best, long-term interests of Zynga and our stakeholders. Therefore, we have made, in the past and may make in the future, significant investments or changes in strategy that we think will benefit our players, even if our decision negatively impacts our operating results in the short term. For example, in late 2009 and in 2010 we reduced in-game advertising offers in order to improve player experience. This decrease in in-game offers led to a reduction of advertising revenue in 2010 as compared to 2009. Our decisions may not result in the long-term benefits that we expect, in which case the success of our games, business and operating results could be harmed.

If we lose the services of our founder and Chief Executive Officer or other members of our senior management team, we may not be able to execute our business strategy.

Our success depends in a large part upon the continued service of our senior management team. In particular, our founder and Chief Executive Officer, Mark Pincus, is critical to our vision, strategic direction, culture, products and technology. We do not maintain key-man insurance for Mr. Pincus or any other member of our senior management team. The loss of our founder and Chief Executive Officer, even temporarily, or any other member of senior management would harm our business.

If we are unable to attract and retain highly qualified employees, we may not be able to grow effectively.

Our ability to compete and grow depends in large part on the efforts and talents of our employees. Such employees, particularly game designers, product managers and engineers, are in high demand, and we devote significant resources to identifying, hiring, training, successfully integrating and retaining these employees. We have historically hired a number of key personnel through acquisitions, and as competition with several other game companies increases, we may incur significant expenses in continuing this practice. The loss of employees or the inability to hire additional skilled employees as necessary could result in significant disruptions to our business, and the integration of replacement personnel could be time-consuming and expensive and cause additional disruptions to our business.

We believe that two critical components of our success and our ability to retain our best people are our culture and our competitive compensation practices. As we continue to grow rapidly, and we develop the infrastructure of a public company, we may find it difficult to maintain our entrepreneurial, execution-focused culture. In addition, many of our employees may be able to receive significant proceeds from sales of our equity in the public markets after our initial public offering, which may reduce their motivation to continue to work for us. Moreover, we expect that this offering will create disparities in wealth among our employees, which may harm our culture and relations among employees.

An increasing number of individuals are utilizing devices other than personal computers to access the Internet, and versions of our games developed for these devices might not gain widespread adoption, or may not function as intended.

The number of individuals who access the Internet through devices other than a personal computer, such as smartphones, tablets, televisions and set-top box devices, has increased dramatically, and we believe this trend is likely to continue. The generally lower processing speed, power, functionality and memory associated with these devices make playing our games through such devices more difficult; and the versions of our games developed for these devices may not be compelling to players. In addition, each device manufacturer or platform provider may establish unique or restrictive terms and conditions for developers on such devices or platforms, and our games may not work well or be viewable on these devices as a result. We have limited experience in developing and optimizing versions of our games for players on alternative devices and platforms. To expand our business, we will need to support a number of alternative devices and technologies. Once developed, we may choose to port or convert a game into separate versions for alternative devices with different technological requirements. As new devices and new mobile platforms or updates to platforms are continually being released, we may encounter problems in developing versions of our games for use on these alternative devices and we may need to devote significant resources to the creation, support, and maintenance of such devices and platforms. If we are unable to successfully expand the platforms and devices on which our games are available, or if the versions of our games that we create for alternative platforms and devices are not compelling to our players, our business will suffer.

Expansion into international markets is important for our growth, and as we expand internationally, we face additional business, political, regulatory, operational, financial and economic risks, any of which could increase our costs and hinder such growth.

Continuing to expand our business to attract players in countries other than the United States is a critical element of our business strategy. An important part of targeting international markets is developing offerings that are localized and customized for the players in those markets. We have limited operating history as a company outside the United States. We expect to continue to devote significant resources to international expansion through acquisitions, the establishment of additional offices and development studios, and increasing our foreign language offerings. Our ability to expand our business and to attract talented employees and players in an increasing number of international markets requires considerable management attention and resources and is subject to the particular challenges of supporting a rapidly growing business in an environment of multiple languages, cultures, customs, legal systems, alternative dispute systems, regulatory systems and commercial infrastructures. We have experienced difficulties in the past and have not been successful in all the countries we have entered. Expanding our international focus may subject us to risks that we have not faced before or increase risks that we currently face, including risks associated with:

Entering new international markets will be expensive, our ability to successfully gain market acceptance in any particular market is uncertain, and the distraction of our senior management team could harm our business.

Competition within the broader entertainment industry is intense and our existing and potential players may be attracted to competing forms of entertainment such as offline and traditional online games, television, movies and sports, as well as other entertainment options on the Internet.

Our players face a vast array of entertainment choices. Other forms of entertainment, such as offline, traditional online, personal computer and console games, television, movies, sports and the Internet, are much larger and more well-established markets and may be perceived by our players to offer greater variety, affordability, interactivity and enjoyment. These other forms of entertainment compete for the discretionary time and income of our players. If we are unable to sustain sufficient interest in our games in comparison to other forms of entertainment, including new forms of entertainment, our business model may no longer be viable.

There are low barriers to entry in the social game industry, and competition is intense.

The social game industry is highly competitive, with low barriers to entry and we expect more companies to enter the sector and a wider range of social games to be introduced. Our competitors that develop social games for social networks vary in size and include publicly-traded companies such as Electronic Arts Inc. and The Walt Disney Company and privately-held companies such as Crowdstar, Inc., Vostu, Ltd. and wooga GmbH. In addition, online game developers and distributors who are primarily focused on specific international markets, such as Tencent Holdings Limited in Asia, and high-profile companies with significant online presences that to date have not developed social games, such as Amazon.com, Facebook, Google Inc., Microsoft Corporation and Yahoo! Inc., may decide to develop social games. Some of these current and potential competitors have significant resources for developing or acquiring additional games, may be able to incorporate their own strong brands and assets into their games, have a more diversified set of revenue sources than we do and may be less severely affected by changes in consumer preferences, regulations or other developments that may impact the online social game industry. In addition, we have limited experience in developing games for mobile and other platforms and our ability to succeed on those platforms is uncertain. As we continue to devote significant resources to developing games for those platforms, we will face significant competition from established companies that may have far greater experience than us, including Electronic Arts Inc., DeNA Co. Ltd., Gameloft SA, Glu Mobile Inc. and Rovio Mobile Ltd. We expect new mobile-game competitors to enter the market and existing competitors to allocate more resources to develop and market competing games and applications.

The value of our virtual goods is highly dependent on how we manage the economies in our games. If we fail to manage our game economies properly, our business may suffer.

Paying players purchase virtual goods in our games because of the perceived value of these goods which is dependent on the relative ease of securing an equivalent good via non-paid means within the game. The perceived value of these virtual goods can be impacted by an increase in the availability of free or discounted Facebook Credits or by various actions that we take in the games including offering discounts for virtual goods, giving away virtual goods in promotions or providing easier non-paid means to secure these goods. If we fail to manage our virtual economies properly, players may be less likely to purchase virtual goods and our business may suffer.

Some of our players may make sales and/or purchases of virtual goods used in our games through unauthorized third-party websites, which may impede our revenue growth.

Some of our players may make sales and/or purchases of our virtual goods, such as Zynga Poker virtual poker chips, through unauthorized third-party sellers in exchange for real currency. These unauthorized transactions are usually arranged on third-party websites. We do not generate any revenue from these transactions. Accordingly, these unauthorized purchases and sales from third-party sellers could impede our revenue and profit growth by, among other things:

To discourage unauthorized purchases and sales of our virtual goods, we have stated in our terms of service that the buying or selling of virtual currency and virtual goods from unauthorized third-party sellers may result in bans from our games and/or legal action. We have banned players as a result of such activities. We have also developed technological measures to help detect unauthorized transactions. If we decide to implement further restrictions on players’ ability to transfer virtual goods, we may lose players, which could harm our financial condition and results of operations.

The proliferation of “cheating” programs and scam offers that seek to exploit our games and players affects the game-playing experience and may lead players to stop playing our games.

Unrelated third parties have developed, and may continue to develop, “cheating” programs that enable players to exploit our games, play them in an automated way or obtain unfair advantages over other players who do play fairly. These programs harm the experience of players who play fairly and may disrupt the virtual economy of our games. In addition, unrelated third parties attempt to scam our players with fake offers for virtual goods. We devote significant resources to discover and disable these programs and activities, and if we are unable to do so quickly our operations may be disrupted, our reputation damaged and players may stop playing our games. This may lead to lost revenue from paying players, increased cost of developing technological measures to combat these programs and activities, legal claims relating to the diminution in value of our virtual currency and goods, and increased customer service costs needed to respond to dissatisfied players.

Our quarterly operating results are volatile and difficult to predict, and our stock price may decline if we fail to meet the expectations of securities analysts or investors.

Our bookings, revenue, traffic and operating results could vary significantly from quarter-to-quarter and year-to-year and may fail to match our past performance because of a variety of factors, some of which are

outside of our control. Any of these events could cause the market price of our Class A common stock to fluctuate. Factors that may contribute to the variability of our operating results include the risk factors listed in this section and the factors discussed in the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Factors Affecting Our Performance.”

In particular, we recognize revenue from sale of our virtual goods in accordance with GAAP, which is complex and based on our assumptions and historical data with respect to the sale and use of various types of virtual goods. In the event that such assumptions are revised based on new data or there are changes in the historical mix of virtual goods sold due to new game introductions, reduced virtual good sales in existing games or other factors, the amount of revenue that we recognize in any particular period may fluctuate significantly. For further information regarding our revenue recognition policy, see the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies—Revenue Recognition.”

Given our short operating history and the rapidly evolving social game industry, our historical operating results may not be useful in predicting our future operating results. In addition, metrics we have developed or those available from third parties regarding our industry and the performance of our games, including DAUs, MAUs, MUUs and ABPU may not be indicative of our financial performance.

Failure to protect or enforce our intellectual property rights or the costs involved in such enforcement could harm our business and operating results.

We regard the protection of our trade secrets, copyrights, trademarks, trade dress, domain names and other product rights as critical to our success. We strive to protect our intellectual property rights by relying on federal, state and common law rights, as well as contractual restrictions. We enter into confidentiality and invention assignment agreements with our employees and contractors and confidentiality agreements with parties with whom we conduct business in order to limit access to, and disclosure and use of, our proprietary information. However, these contractual arrangements and the other steps we have taken to protect our intellectual property may not prevent the misappropriation of our proprietary information or deter independent development of similar technologies by others.

We pursue the registration of our domain names, trademarks, and service marks in the United States and in certain locations outside the United States. We are seeking to protect our trademarks, patents and domain names in an increasing number of jurisdictions, a process that is expensive and time-consuming and may not be successful or which we may not pursue in every location. We may, over time, increase our investment in protecting our innovations through increased patent filings that are expensive and time-consuming and may not result in issued patents that can be effectively enforced.

Litigation may be necessary to enforce our intellectual property rights, protect our trade secrets or determine the validity and scope of proprietary rights claimed by others. Any litigation of this nature, regardless of outcome or merit, could result in substantial costs, adverse publicity or diversion of management and technical resources, any of which could adversely affect our business and operating results. If we fail to maintain, protect and enhance our intellectual property rights, our business and operating results may be harmed.

We are, and may in the future be, subject to intellectual property disputes, which are costly to defend and could require us to pay significant damages and could limit our ability to use certain technologies in the future.

From time to time, we have faced, and we expect to face in the future, allegations that we have infringed the trademarks, copyrights, patents and other intellectual property rights of third parties, including from our competitors, non-practicing entities and former employers of our personnel. Patent and other intellectual property litigation may be protracted and expensive, and the results are difficult to predict. As the result of any court

judgment or settlement we may be obligated to cancel the launch of a new game, stop offering certain features, pay royalties or significant settlement costs, purchase licenses or modify our games and features while we develop substitutes.

In addition, we use open source software in our games and expect to continue to use open source software in the future. From time to time, we may face claims from companies that incorporate open source software into their products, claiming ownership of, or demanding release of, the source code, the open source software and/or derivative works that were developed using such software, or otherwise seeking to enforce the terms of the applicable open source license. These claims could also result in litigation, require us to purchase a costly license or require us to devote additional research and development resources to change our games, any of which would have a negative effect on our business and operating results.

Although we do not believe that the final outcome of litigation and claims that we currently face will have a material adverse effect on our business, our expectations may not prove to be correct. Even if these matters do not result in litigation or are resolved in our favor or without significant cash settlements, these matters, and the time and resources necessary to litigate or resolve them, could harm our business, operating results, financial condition, reputation or the market price of our Class A common stock.

Programming errors or flaws in our games could harm our reputation or decrease market acceptance of our games, which would harm our operating results.

Our games may contain errors, bugs, flaws or corrupted data, and these defects may only become apparent after their launch, particularly as we launch new games and rapidly release new features to existing games under tight time constraints. We believe that if our players have a negative experience with our games, they may be less inclined to continue or resume playing our games or recommend our games to other potential players. Undetected programming errors, game defects and data corruption can disrupt our operations, adversely affect the game experience of our players by allowing players to gain unfair advantage, harm our reputation, cause our players to stop playing our games, divert our resources and delay market acceptance of our games, any of which could result in legal liability to us or harm our operating results.

Evolving regulations concerning data privacy may result in increased regulation and different industry standards, which could prevent us from providing our current games to our players, or require us to modify our games, thereby harming our business.

The regulatory framework for privacy issues worldwide is currently in flux and is likely to remain so for the foreseeable future. Practices regarding the collection, use, storage, transmission and security of personal information by companies operating over the Internet and mobile platforms have recently come under increased public scrutiny, and civil claims alleging liability for the breach of data privacy have been asserted against us. The U.S. government, including the Federal Trade Commission and the Department of Commerce, has announced that it is reviewing the need for greater regulation for the collection of information concerning consumer behavior on the Internet, including regulation aimed at restricting certain targeted advertising practices. In addition, the European Union is in the process of proposing reforms to its existing data protection legal framework, which may result in a greater compliance burden for companies with users in Europe. Various government and consumer agencies have also called for new regulation and changes in industry practices.

We began operations in 2007 and have grown rapidly. While our administrative systems have developed rapidly, during our earlier history our practices relating to intellectual property, data privacy and security, and legal compliance may not have been as robust as they are now, and there may be unasserted claims arising from this period that we are not able to anticipate. In addition, our business, including our ability to operate and expand internationally, could be adversely affected if laws or regulations are adopted, interpreted, or implemented in a manner that is inconsistent with our current business practices and that require changes to these practices, the design of our website, games, features or our privacy policy. In particular, the success of our

business has been, and we expect will continue to be, driven by our ability to responsibly use the data that our players share with us. Therefore, our business could be harmed by any significant change to applicable laws, regulations or industry practices regarding the use or disclosure of data our players choose to share with us, or regarding the manner in which the express or implied consent of consumers for such use and disclosure is obtained. Such changes may require us to modify our games and features, possibly in a material manner, and may limit our ability to develop new games and features that make use of the data that our players voluntarily share with us.

We process, store and use personal information and other data, which subjects us to governmental regulation and other legal obligations related to privacy, and our actual or perceived failure to comply with such obligations could harm our business.

We receive, store and process personal information and other player data, and we enable our players to share their personal information with each other and with third parties, including on the Internet and mobile platforms. There are numerous federal, state and local laws around the world regarding privacy and the storing, sharing, use, processing, disclosure and protection of personal information and other player data on the Internet and mobile platforms, the scope of which are changing, subject to differing interpretations, and may be inconsistent between countries or conflict with other rules. We generally comply with industry standards and are subject to the terms of our own privacy policies and privacy-related obligations to third parties (including voluntary third-party certification bodies such as TRUSTe). We strive to comply with all applicable laws, policies, legal obligations and certain industry codes of conduct relating to privacy and data protection, to the extent reasonably attainable. However, it is possible that these obligations may be interpreted and applied in a manner that is inconsistent from one jurisdiction to another and may conflict with other rules or our practices. Any failure or perceived failure by us to comply with our privacy policies, our privacy-related obligations to players or other third parties, or our privacy-related legal obligations, or any compromise of security that results in the unauthorized release or transfer of personally identifiable information or other player data, may result in governmental enforcement actions, litigation or public statements against us by consumer advocacy groups or others and could cause our players to lose trust in us, which could have an adverse effect on our business. Additionally, if third parties we work with, such as players, vendors or developers, violate applicable laws or our policies, such violations may also put our players’ information at risk and could in turn have an adverse effect on our business.

In the area of information security and data protection, many states have passed laws requiring notification to players when there is a security breach for personal data, such as the 2002 amendment to California’s Information Practices Act, or requiring the adoption of minimum information security standards that are often vaguely defined and difficult to practically implement. The costs of compliance with these laws may increase in the future as a result of changes in interpretation. Furthermore, any failure on our part to comply with these laws may subject us to significant liabilities.

Our business is subject to a variety of other U.S. and foreign laws, many of which are unsettled and still developing and which could subject us to claims or otherwise harm our business.

We are subject to a variety of laws in the United States and abroad, including laws regarding consumer protection, intellectual property, export and national security, that are continuously evolving and developing. The scope and interpretation of the laws that are or may be applicable to us are often uncertain and may be conflicting, particularly laws outside the United States. For example, laws relating to the liability of providers of online services for activities of their users and other third parties are currently being tested by a number of claims, including actions based on invasion of privacy and other torts, unfair competition, copyright and trademark infringement, and other theories based on the nature and content of the materials searched, the ads posted or the content provided by users. It is also likely that as our business grows and evolves and our games are played in a greater number of countries, we will become subject to laws and regulations in additional jurisdictions. We are potentially subject to a number of foreign and domestic laws and regulations that affect the offering of certain types of content, such as that which depicts violence, many of which are ambiguous, still

evolving and could be interpreted in ways that could harm our business or expose us to liability. In addition, certain of our games, including Zynga Poker, may become subject to gambling-related rules and regulations and expose us to civil and criminal penalties if we do not comply. It is difficult to predict how existing laws will be applied to our business and the new laws to which we may become subject. See the discussion included in the section titled “Business — Government Regulation.”

If we are not able to comply with these laws or regulations or if we become liable under these laws or regulations, we could be directly harmed, and we may be forced to implement new measures to reduce our exposure to this liability. This may require us to expend substantial resources or to modify our games, which would harm our business, financial condition and results of operations. In addition, the increased attention focused upon liability issues as a result of lawsuits and legislative proposals could harm our reputation or otherwise impact the growth of our business. Any costs incurred as a result of this potential liability could harm our business and operating results.

It is possible that a number of laws and regulations may be adopted or construed to apply to us in the United States and elsewhere that could restrict the online and mobile industries, including player privacy, advertising, taxation, content suitability, copyright, distribution and antitrust. Furthermore, the growth and development of electronic commerce and virtual goods may prompt calls for more stringent consumer protection laws that may impose additional burdens on companies such as ours conducting business through the Internet and mobile devices. We anticipate that scrutiny and regulation of our industry will increase and we will be required to devote legal and other resources to addressing such regulation. For example, existing laws or new laws regarding the regulation of currency and banking institutions may be interpreted to cover virtual currency or goods. If that were to occur we may be required to seek licenses, authorizations or approvals from relevant regulators, the granting of which may be dependent on us meeting certain capital and other requirements and we may be subject to additional regulation and oversight, all of which could significantly increase our operating costs. Changes in current laws or regulations or the imposition of new laws and regulations in the United States or elsewhere regarding these activities may lessen the growth of social game services and impair our business.

Companies and governmental agencies may restrict access to Facebook, our website or the Internet generally, which could lead to the loss or slower growth of our player base.

Our players need to access the Internet and in particular Facebook and our website to play our games. Companies and governmental agencies, could block access to Facebook, our website or the Internet generally for a number of reasons such as security or confidentiality concerns or regulatory reasons, or they may adopt policies that prohibit employees from accessing Facebook, our website or other social platforms. For example, the government of the People’s Republic of China has blocked access to Facebook in China. If companies or governmental entities block or limit access to Facebook or our website or otherwise adopt policies restricting players from playing our games our business could be negatively impacted and could lead to the loss or slower growth of our player base.

Our business will suffer if we are unable to successfully integrate acquired companies into our business or otherwise manage the growth associated with multiple acquisitions.

We have acquired businesses, personnel and technologies in the past and we intend to continue to pursue acquisitions that are complementary to our existing business and expand our employee base and the breadth of our offerings. Our ability to grow through future acquisitions will depend on the availability of suitable acquisition and investment candidates at an acceptable cost, our ability to compete effectively to attract these candidates and the availability of financing to complete larger acquisitions. Since we expect the social game industry to consolidate in the future, we may face significant competition in executing our growth strategy. Future acquisitions or investments could result in potential dilutive issuances of equity securities, use of significant cash balances or incurrence of debt, contingent liabilities or amortization expenses related to goodwill

and other intangible assets, any of which could adversely affect our financial condition and results of operations. The benefits of an acquisition or investment may also take considerable time to develop, and we cannot be certain that any particular acquisition or investment will produce the intended benefits.

Integration of a new company’s operations, assets and personnel into ours will require significant attention from our management. The diversion of our management’s attention away from our business and any difficulties encountered in the integration process could harm our ability to manage our business. Future acquisitions will also expose us to potential risks, including risks associated with any acquired liabilities, the integration of new operations, technologies and personnel, unforeseen or hidden liabilities and unanticipated, information security vulnerabilities, the diversion of resources from our existing businesses, sites and technologies, the inability to generate sufficient revenue to offset the costs and expenses of acquisitions, and potential loss of, or harm to, our relationships with employees, players, and other suppliers as a result of integration of new businesses.

Fluctuations in foreign currency exchange rates will affect our financial results, which we report in U.S. dollars.

As we continue to expand our international operations, we become more exposed to the effects of fluctuations in currency exchange rates. We incur expenses for employee compensation and other operating expenses at our non-U.S. locations in the local currency, and an increasing percentage of our international revenue is from players who pay us in currencies other than the U.S. dollar. Fluctuations in the exchange rates between the U.S. dollar and those other currencies could result in the dollar equivalent of such expenses being higher and/or the dollar equivalent of such foreign-denominated revenue being lower than would be the case if exchange rates were stable. This could have a negative impact on our reported operating results. To date, we have not engaged in any hedging strategies, and any such strategies, such as forward contracts, options and foreign exchange swaps related to transaction exposures that we may implement to mitigate this risk may not eliminate our exposure to foreign exchange fluctuations.

The enactment of legislation implementing changes in the U.S. taxation of international business activities or the adoption of other tax reform policies could materially impact our financial position and results of operations.

The current administration has made public statements indicating that it has made international tax reform a priority, and key members of the U.S. Congress have conducted hearings and proposed new legislation. Recent changes to U.S. tax laws, including limitations on the ability of taxpayers to claim and utilize foreign tax credits and the deferral of certain tax deductions until earnings outside of the United States are repatriated to the United States, as well as changes to U.S. tax laws that may be enacted in the future, could impact the tax treatment of our foreign earnings. Due to the large and expanding scale of our international business activities, any changes in the U.S. taxation of such activities may increase our worldwide effective tax rate and harm our financial position and results of operations.

A change in the application of the tax laws of various jurisdictions could result in an increase to our worldwide effective tax rate and a change in how we operate our business.

Our corporate structure and intercompany arrangements, including the manner in which we develop and use our intellectual property and the transfer pricing of our intercompany transactions, are intended to provide us worldwide tax efficiencies. The application of the tax laws of various jurisdictions, including the United States, to our international business activities is subject to interpretation and depends on our ability to operate our business in a manner consistent with our corporate structure and intercompany arrangements. The taxing authorities of the jurisdictions in which we operate may challenge our methodologies for valuing developed technology or intercompany arrangements, including our transfer pricing, or determine that the manner in which we operate our business is not consistent with the manner in which we report our income to the jurisdictions, which could increase our worldwide effective tax rate and harm our financial position and results of operations.

Our facilities are located near known earthquake fault zones, and the occurrence of an earthquake or other natural disaster could cause damage to our facilities and equipment, which could require us to curtail or cease operations.

Our principal offices and a network operations center are located in the San Francisco Bay Area, an area known for earthquakes, and are thus vulnerable to damage. We are also vulnerable to damage from other types of disasters, including power loss, fire, explosions, floods, communications failures, terrorist attacks and similar events. If any disaster were to occur, our ability to operate our business at our facilities could be impaired.

We may require additional capital to meet our financial obligations and support business growth, and this capital might not be available on acceptable terms or at all.

We intend to continue to make significant investments to support our business growth and may require additional funds to respond to business challenges, including the need to develop new games and features or enhance our existing games, improve our operating infrastructure or acquire complementary businesses, personnel and technologies. Accordingly, we may need to engage in equity or debt financings to secure additional funds. If we raise additional funds through future issuances of equity or convertible debt securities, our existing stockholders could suffer significant dilution, and any new equity securities we issue could have rights, preferences and privileges superior to those of holders of our Class A common stock. Any debt financing we secure in the future could involve restrictive covenants relating to our capital raising activities and other financial and operational matters, which may make it more difficult for us to obtain additional capital and to pursue business opportunities, including potential acquisitions. We may not be able to obtain additional financing on terms favorable to us, if at all. If we are unable to obtain adequate financing or financing on terms satisfactory to us when we require it, our ability to continue to support our business growth and to respond to business challenges could be significantly impaired, and our business may be harmed.

The three class structure of our common stock has the effect of concentrating voting control with those stockholders who held our stock prior to this offering, including our founder and Chief Executive Officer and our other executive officers, employees and directors and their affiliates; this will limit your ability to influence corporate matters.

Our Class C common stock has 70 votes per share, our Class B common stock has seven votes per share and our Class A common stock, which is the stock we are offering in this offering, has one vote per share. The holders of Class B common stock and Class C common stock, including our founder and Chief Executive Officer, Mark Pincus, and our other executive officers, employees and directors and their affiliates, will collectively hold approximately % of the voting power of our outstanding capital stock following this offering. As a result, these holders, along with Mr. Pincus, will have significant influence over the management and affairs of the company and over matters requiring stockholder approval, including the election of directors and significant corporate transactions, such as a merger or other sale of our company or its assets, for the foreseeable future. This concentrated voting control will limit your ability to influence corporate matters and could adversely affect the market price of our Class A common stock. Future sales by holders of Class B common stock or Class C common stock will result in those shares converting to Class A common stock, which will have the effect, over time, of increasing the relative voting power of those stockholders who retain their existing shares of Class B or Class C common stock. In addition, as shares of Class B common stock are sold and converted to Class A common stock, the sole holder of Class C common stock, Mr. Pincus, will have greater relative voting control to the extent he retains his existing shares of Class C common stock. Mr. Pincus is entitled to vote his shares in his own interests and may do so.

Certain provisions in our charter documents and under Delaware law could limit attempts by our stockholders to replace or remove our board of directors or current management and limit the market price of our Class A common stock.

Provisions in our certificate of incorporation and bylaws may have the effect of delaying or preventing changes in our board of directors or management. Our certificate of incorporation and bylaws will include provisions that:

These provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our board of directors, which is responsible for appointing the members of our management. In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which generally prohibits a Delaware corporation from engaging in any of a broad range of business combinations with any “interested” stockholder for a period of three years following the date on which the stockholder became an “interested” stockholder.

Our share price may be volatile, and you may be unable to sell your shares at or above the initial public offering price, if at all.

The initial public offering price for the shares of our Class A common stock will be determined by negotiations between us and representatives of the underwriters and may not be indicative of prices that will prevail in the trading market. The market price of our Class A common stock could be subject to wide fluctuations in response to many risk factors listed in this section, and others beyond our control, including:

Furthermore, the stock markets have experienced extreme price and volume fluctuations that have affected and continue to affect the market prices of equity securities of many companies. These fluctuations often have been unrelated or disproportionate to the operating performance of those companies. These broad market and industry fluctuations, as well as general economic, political and market conditions such as recessions, interest rate changes or international currency fluctuations, may negatively impact the market price of our Class A common stock. If the market price of our Class A common stock after this offering does not exceed the initial public offering price, you may not realize any return on your investment and may lose some or all of your investment. In the past, companies that have experienced volatility in the market price of their stock have been subject to securities class action litigation. We may be the target of this type of litigation in the future. Securities litigation against us could result in substantial costs and divert our management’s attention from other business concerns, which could harm our business.

Our Class A common stock price may be volatile due to third-party data regarding our games.

Third parties, such as AppData, publish daily data about us and other social game companies with respect to DAUs and MAUs and other information concerning social game usage, in particular on Facebook. These metrics can be volatile, particularly for specific games, and in many cases do not accurately reflect the actual levels of usage of our games across all platforms and may not correlate to our bookings or revenue from the sale of virtual goods. There is a possibility that third parties could change their methodologies for calculating these metrics in the future. To the extent that securities analysts or investors base their views of our business or prospects on such third-party data, the price of our Class A common stock may be volatile and may not reflect the performance of our business.

We may invest or spend the proceeds of this offering in ways with which you may not agree or in ways which may not yield a return.

The net proceeds from the sale of shares by us in the offering may be used for general corporate purposes, including working capital. We may also use a portion of the net proceeds to acquire or invest in complementary businesses, technologies or other assets. Our management will have considerable discretion in the application of the net proceeds, and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. The net proceeds to us from this offering may be invested with a view towards long-term benefits for our stockholders, and this may not increase our operating results or the market value of our Class A common stock. Until the net proceeds are used, they may be placed in investments that do not produce significant income or that may lose value.

If securities or industry analysts do not publish research about our business, or publish negative reports about our business, our share price and trading volume could decline.

The trading market for our Class A common stock will, to some extent, depend on the research and reports that securities or industry analysts publish about our business. We do not have any control over these analysts. If one or more of the analysts who cover us downgrade our shares or change their opinion of our shares, our share price would likely decline. If one or more of these analysts cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which could cause our share price or trading volume to decline.

Future sales of our Class A common stock in the public market could cause our share price to decline.

Sales of a substantial number of shares of our Class A common stock in the public market after this offering, or the perception that these sales might occur, could depress the market price of our Class A common stock and could impair our ability to raise capital through the sale of additional equity securities. Based on the total number of outstanding shares of our common stock as of June 30, 2011, upon the closing of this offering, we will have shares of Class A common stock, shares of Class B common stock and shares of Class C common stock outstanding, assuming no exercise of our outstanding options and warrants or vesting of ZSUs, and the sale of shares of our Class A common stock to be sold by the selling stockholders.

All of the shares of Class A common stock sold in this offering will be freely tradable without restrictions or further registration under the Securities Act of 1933, as amended, or the Securities Act, except for any shares held by our affiliates as defined in Rule 144 under the Securities Act. The shares of Class B common stock and shares of Class C common stock outstanding after this offering, based on shares outstanding as of June 30, 2011, will be restricted as a result of securities laws, lock-up agreements or other contractual restrictions that restrict transfers after the date of this prospectus. Please see the discussion in the section titled “Shares Eligible For Future Sale”.

After this offering, the holders of shares of Class B common stock, or % of our total outstanding common stock, and shares of Class C common stock, or % of our total outstanding common stock, based

on shares outstanding as of June 30, 2011 and giving effect to the sale of shares by the selling stockholders, will be entitled to rights with respect to registration of these shares under the Securities Act pursuant to an investors’ rights agreement. Shares of our Class B and Class C common stock automatically will convert into shares of our Class A common stock upon any sale or transfer, whether or not for value, except for certain transfers described in our amended and restated certificate of incorporation to become effective upon closing of this offering. If these holders of our Class B and Class C common stock, by exercising their registration rights, sell a large number of shares, they could adversely affect the market price for our Class A common stock. If we file a registration statement for the purposes of selling additional shares to raise capital and are required to include shares held by these holders pursuant to the exercise of their registration rights, our ability to raise capital may be impaired. We intend to file a registration statement on Form S-8 under the Securities Act to register up to approximately million shares of our common stock for issuance under our Amended and Restated 2007 Equity Incentive Plan, 2011 Employee Stock Purchase Plan and 2011 Equity Incentive Plan. Once we register these shares, they can be freely sold in the public market upon issuance and once vested, subject to a lock-up period and other restrictions provided under the terms of the applicable plan and/or the agreements entered into with the holders of these shares.

No public market for our Class A common stock currently exists, and an active public trading market may not develop or be sustained following this offering.

Prior to this offering, there has been no public market for our Class A common stock, and there has been no public market or active private market for our other classes of capital stock. Although we have applied to list our Class A common stock on the , an active trading market may not develop following the completion of this offering or, if developed, may not be sustained. The lack of an active market may impair your ability to sell your shares at the time you wish to sell them or at a price that you consider reasonable. The lack of an active market may also reduce the market price of your shares of Class A common stock. An inactive market may also impair our ability to raise capital by selling shares and may impair our ability to acquire other companies or technologies by using our shares as consideration.

If we are unable to implement and maintain effective internal control over financial reporting in the future, the accuracy and timeliness of our financial reporting may be adversely affected.

If we are unable to maintain adequate internal controls for financial reporting in the future, or if our auditors are unable to express an opinion as to the effectiveness of our internal controls as will be required pursuant to the Sarbanes-Oxley Act, investor confidence in the accuracy of our financial reports may be impacted or the market price of our Class A common stock could be negatively impacted.

The requirements of being a public company may strain our resources, divert management’s attention and affect our ability to attract and retain qualified board members.

As a public company, we will be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, or the Exchange Act, the Sarbanes-Oxley Act, the Dodd-Frank Act, the listing requirements of the and other applicable securities rules and regulations. Compliance with these rules and regulations will increase our legal and financial compliance costs, make some activities more difficult, time-consuming or costly and increase demand on our systems and resources. The Exchange Act requires, among other things, that we file annual, quarterly and current reports with respect to our business and operating results.

We also expect that being a public company will make it more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced coverage or incur substantially higher costs to obtain coverage. These factors could also make it more difficult for us to attract and retain qualified members of our board of directors, particularly to serve on our audit committee and compensation committee, and qualified executive officers.

As a result of disclosure of information in this prospectus and in filings required of a public company, our business and financial condition will become more visible, which we believe may result in threatened or actual

litigation, including by competitors and other third parties. If such claims are successful, our business and operating results could be harmed, and even if the claims do not result in litigation or are resolved in our favor, these claims, and the time and resources necessary to resolve them, could divert the resources of our management and harm our business and operating results.

We do not intend to pay dividends for the foreseeable future, and as a result your ability to achieve a return on your investment will depend on appreciation in the price of our Class A common stock.

We have never declared or paid any cash dividends on our common stock and do not intend to pay any cash dividends in the foreseeable future. We anticipate that we will retain all of our future earnings for use in the development of our business and for general corporate purposes. Any determination to pay dividends in the future will be at the discretion of our board of directors. Accordingly, investors must rely on sales of their Class A common stock after price appreciation, which may never occur, as the only way to realize any future gains on their investments.

Zynga is a company with more than 2,000 amazingly talented employees dedicated to engaging, surprising and delighting an audience that has grown to 148 million monthly unique users in 166 countries. And because our users typically play more than one of our games each month, they account for 232 million “MAUs” (monthly active users). Our players create and store more than 38,000 virtual items every second and spend 2 billion minutes a day with our service. In just over 4 years, we’ve generated over $1.25 billion in revenue and over $1.75 billion in bookings.

We founded Zynga in 2007 with the mission of connecting the world through games. We believed play—like search, share and shop—would become one of the core activities on the internet.

Play is one of life’s big macros—it’s an activity people love to do and do often. Zynga was founded on a deeply held passion for games that family and friends play together—connecting, collaborating, gifting, bragging, nurturing, admiring and sometimes just doing silly stuff together. Reality is, we all wish we had more time to play together.

To put the play macro in perspective, games have become the second most popular internet activity based on time spent, and have even surpassed email. We’ve turned our rapidly growing base of smartphones and tablets into play devices. In fact, games are now the most popular category of apps on smartphones and represent nearly half of the time spent. But, Zynga has a lot of hard work, innovation and growth ahead of us to create a future where social gaming becomes a daily habit for nearly everyone.

Our strategy from the beginning has been to build the biggest macro bet on social gaming to provide our players with the most accessible, social and fun games. Despite our rapid growth, we have been careful to build for the long term. I’ve always thought of this journey as being a series of sprints that make up a marathon.

We raised hundreds of millions of dollars to maximize our ability to make large investments in teams, games and infrastructure. For example, our Chief Technology Officer joined us in the fall of 2008 with a mission of building the greatest data warehouse in the game industry, which now processes 15 terabytes of game data every day. We will continue to make these big investments and big bets in pursuit of our mission.

As we look to the future, we believe our core values will be key to our continued growth. Our goal is for everyone at Zynga to be a CEO with accountability and authority to drive important outcomes. It takes inspired

people to make inspiring products. We’ve endeavored to create an environment that fosters intelligent risk-taking in order to invent bold beats—innovations that really advance the social gaming experience for our players. Our company is diverse, creative and entrepreneurial. I often describe Zynga as a confederation of entrepreneurs.

And now, by offering our shares to the public we hope to enable Zynga to invest more in play than any company in history. To accomplish this, we will continue to make big investments in servers, data centers and other infrastructure so players’ farms, cities, islands, airplanes, triple words and empires can be available on all their devices in an instant. We will also continue to fund the best teams around the world to build the most accessible, social and fun games.

We believe we will maximize long-term shareholder value by delivering long-term player value. This means we will make decisions and trade-offs that are different from other companies. We will prioritize innovation and long-term growth over quarterly earnings. We will not make short-term decisions that sacrifice our core values or veer from our long-term vision.

As we have done with our current investors, we will strive to communicate with transparency to help you understand how we are doing against our mission. You will be able to track our performance every day in publicly available third-party traffic reports. And of course, you’ll be able to play our games yourself to be able to track our progress against being the most fun and most social.

With this offering we are inviting you to join our mission. Invest with us because you believe in the potential for the world to play together. Evaluate us by how many of your friends and family play our games. Before you invest, we hope you will play our games. And, if you’re part of the hundreds of millions who have already played our games, thank you. You’re part of the future.

At Zynga, we feel a personal connection to our games through our friends and family. I love that my brother in-law, who has five kids and no free time, religiously plays our game Words with Friends.

While I’m humbled by the size of the audience we enable to play today, we’re just getting started. We’re thinking every day how much more accessible, social and fun our games can get.

My kids decided a few months ago that peek-a-boo was their favorite game. While it’s unlikely we can improve upon this classic, I look forward to playing Zynga games with them very soon. When they enter high school there’s no doubt that they’ll search on Google, they’ll share with their friends on Facebook and they’ll probably do a lot of shopping on Amazon. And I’m planning for Zynga to be there when they want to play.

This prospectus, including the letter from our founder and the sections titled “Prospectus Summary,” “Risk Factors,” “Market Data and User Metrics,” “Use of Proceeds,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” “Business” and “Shares Eligible for Future Sale,” contains forward-looking statements. In some cases you can identify these statements by forward-looking words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “could,” “would,” “project,” “plan,” “expect” or the negative or plural of these words or similar expressions. These forward-looking statements include, but are not limited to, statements concerning the following:

These forward-looking statements are subject to a number of risks, uncertainties and assumptions, including those described in “Risk Factors.” Moreover, we operate in a very competitive and rapidly changing environment. New risks emerge from time to time. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this prospectus may not occur and actual results could differ materially and adversely from those anticipated or implied in the forward-looking statements.

You should not rely upon forward-looking statements as predictions of future events. Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee that the future results, levels of activity, performance or events and circumstances reflected in the forward-looking statements will be achieved or occur. Moreover, except as required by law, neither we nor any other person assumes responsibility for the accuracy and completeness of the forward-looking statements. We undertake no obligation to update publicly any forward-looking statements for any reason after the date of this prospectus to conform these statements to actual results or to changes in our expectations.

You should read this prospectus and the documents that we reference in this prospectus and have filed with the Securities and Exchange Commission as exhibits to the registration statement of which this prospectus is a part with the understanding that our actual future results, levels of activity, performance and events and circumstances may be materially different from what we expect.

Unless otherwise indicated, information contained in this prospectus concerning our industry and the sector in which we operate, including our general expectations and position, opportunity and size estimates, is based on information from various sources, on assumptions that we have made that are based on those and other similar sources and on our knowledge of the audience for our games. This information involves a number of assumptions and limitations, and we caution you not to give undue weight to such estimates. We have not independently verified any third-party information and while we believe the position, opportunity and sector size information included in this prospectus is generally reliable, such information is inherently imprecise. In addition, projections, assumptions and estimates of our future performance and the future performance of the industry in which we operate is necessarily subject to a high degree of uncertainty and risk due to a variety of factors, including those described in “Risk Factors” and elsewhere in this prospectus. These and other factors could cause results to differ materially from those expressed in the estimates made by the independent parties and by us.

We believe that our games compete for the attention of players with the other forms of entertainment that comprise the global entertainment industry. Collectively, we refer to these markets as the “Worldwide Entertainment Market.” According to IDC, the worldwide markets for Internet advertising, television advertising, video game software and radio advertising in 2011 are forecasted to be $79 billion, $191 billion, $52 billion and $31 billion, respectively. According to IBISWorld, Inc., a media research and consulting company, the worldwide markets for movies, books, newspapers (including newspaper advertising), magazines (including magazine advertising) and recorded music in 2011 are forecasted to be $125 billion, $97 billion, $169 billion, $119 billion and $30 billion, respectively. According to Screen Digest, Ltd., a market research firm, the worldwide market for television subscriptions in 2011 is forecasted to be $184 billion. Aggregating these sources, we believe that the Worldwide Entertainment Market in 2011 is forecasted to be more than $1.0 trillion.

In this prospectus, when we refer to DAUs, MAUs, MUUs or ABPU, unless otherwise indicated, we are referring to internally-measured user information. For information concerning these metrics as measured by us, see the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Key Metrics—Key Operating Metrics.” We also refer in this prospectus to DAUs and MAUs as measured and published by AppData, an independent service that publicly reports traffic data for games and other applications on Facebook. We rely on AppData information whenever we refer to the ranking of our games on Facebook or compare our games to the games of other developers on Facebook. Each of these references is identified by the phrase “according to AppData” or a similar phrase. References in this prospectus to AppData mean Inside Network’s AppData service, together with other services run by Inside Network. Our DAU and MAU information is based on our own internal analytics systems and may differ from the corresponding information published by AppData. Reasons for the differences include:

AppData has changed its methodologies for calculating DAUs and MAUs in the past and may change its methodologies in the future.

We estimate that the net proceeds from the sale of Class A common stock offered by us will be approximately $ million, based upon an assumed initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, and after deducting underwriting discounts and commissions and estimated offering expenses payable by us. If the underwriters’ over-allotment option to purchase additional shares in this offering is exercised in full, we estimate that our net proceeds will be approximately $ million, after deducting underwriting discounts and commissions and estimated offering expenses payable by us. We will not receive any proceeds from the sale of Class A common stock by the selling stockholders.

Each $1.00 increase (decrease) in the assumed initial public offering price of $ per share would increase (decrease) the net proceeds to us from this offering by approximately $ million, assuming the number of shares offered by us as set forth on the cover page of this prospectus remains the same and after deducting the underwriting discounts and commissions. Similarly, each increase (decrease) of shares in the number of shares of Class A common stock offered by us would increase (decrease) the net proceeds to us from this offering by approximately $ million, assuming that the assumed initial public offering price remains the same, and after deducting the underwriting discounts and commissions.

The principal purposes of this offering are to increase our capitalization and financial flexibility, increase our visibility in the marketplace and create a public market for our Class A common stock. As of the date of this prospectus, we cannot specify with certainty all of the particular uses for the net proceeds to us of this offering. However, we currently intend to use the net proceeds to us from this offering primarily for general corporate purposes, including working capital, game development, marketing activities and capital expenditures. We also intend to use approximately $ million of the net proceeds to satisfy tax withholding obligations related to the vesting of ZSUs held by current or former employees and other service providers, which will occur in connection with this offering. We may also use a portion of the net proceeds for the acquisition of, or investment in, complementary businesses, technologies or other assets that complement our business, although we have no present commitments or agreements to enter into any material acquisitions or investments. We intend to contribute a portion of the net proceeds to charitable causes through Zynga.org, our philanthropic initiative. We will have broad discretion over the uses of the net proceeds in this offering. Pending these uses, we intend to invest the net proceeds from this offering in short-term, investment-grade interest-bearing securities such as money market funds, certificates of deposit, commercial paper and guaranteed obligations of the U.S. government.

We have never declared or paid, and do not anticipate declaring or paying, any cash dividends on our capital stock. Any future determination as to the declaration and payment of dividends, if any, will be at the discretion of our board of directors and will depend on then existing conditions, including our financial condition, operating results, contractual restrictions, capital requirements, business prospects and other factors our board of directors may deem relevant.

The following table sets forth our cash, cash equivalents and marketable securities and our capitalization as of June 30, 2011:

You should read the information in this table together with our financial statements and accompanying notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” appearing elsewhere in this prospectus.

The outstanding share information in the table above is based on 565,056,979 shares of our Class B common stock (including preferred stock on an as converted basis) and 20,517,472 shares of our Class C common stock outstanding as of June 30, 2011, and excludes:

If you invest in our Class A common stock, your interest will be diluted to the extent of the difference between the initial public offering price per share of our Class A common stock and the pro forma as adjusted net tangible book value per share of our common stock immediately after this offering. The historical net tangible book value of our common stock as of June 30, 2011 was $638.0 million, or $2.26 per share. Historical net tangible book value per share represents our total tangible assets less our total liabilities, divided by the number of shares of outstanding common stock.

After giving effect to (i) the automatic conversion of our outstanding preferred stock into our Class B common stock immediately prior to the closing of this offering, (ii) the issuance of shares of Class B common stock upon the vesting of outstanding ZSUs in connection with this offering and (iii) the receipt of the net proceeds from our sale of shares of Class A common stock at an assumed initial public offering price of $ per share, the mid-point of the price range set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses payable by us, our pro forma as adjusted net tangible book value as of June 30, 2011 would have been approximately $ , or $ per share. This represents an immediate increase in pro forma as adjusted net tangible book value of $ per share to our existing stockholders and an immediate dilution of $ per share to investors purchasing Class A common stock in this offering.

The following table illustrates this dilution on a per share basis to new investors:

Each $1.00 increase (decrease) in the assumed initial public offering price of $ per share would increase (decrease) the pro forma net tangible book value, as adjusted to give effect to this offering, by $ per share and the dilution to new investors by $ per share, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same, and after deducting underwriting discounts and commissions. Similarly, each increase (decrease) of shares in the number of Class A common stock offered by us would increase (decrease) the pro forma net tangible book value, as adjusted to give effect to this offering, by approximately $ per share and the dilution to new investors by $ per share, assuming the assumed initial public offering price remains the same and after deducting underwriting discounts and commissions. If the underwriters exercise their over-allotment option in full, the pro forma net tangible book value per share of our Class A, Class B and Class C common stock, as adjusted to give effect to this offering, would be $ per share, and the dilution in pro forma net tangible book value per share to investors in this offering would be $ per share of Class A common stock.

The table below summarizes as of June 30, 2011, on a pro forma as adjusted basis described above, the number of shares of our common stock, the total consideration and the average price per share (i) paid to us by our existing stockholders and (ii) to be paid by new investors purchasing our Class A common stock in this offering at an assumed initial public offering price of $ per share, the midpoint of the price range set forth on the cover page of this prospectus, before deducting underwriting discounts and commissions and estimated offering expenses payable by us.

The total number of shares of our Class A, Class B and Class C common stock reflected in the discussion and tables above is based on no shares of our Class A common stock, 565,056,979 shares of our Class B common stock (including preferred stock on an as converted basis) and 20,517,472 shares of our Class C common stock outstanding, as of June 30, 2011, and excludes:

Sales by the selling stockholders in this offering will cause the number of shares held by existing stockholders to be reduced to shares, or % of the total number of shares of our common stock outstanding after this offering, and will increase the number of shares held by new investors to shares, or % of the total number of shares outstanding after this offering.

To the extent that any outstanding options are exercised, new options are issued under our stock-based compensation plans or we issue additional shares of common stock in the future, there will be further dilution to investors participating in this offering. If all outstanding options under our 2007 Equity Incentive Plan as of June 30, 2011 were exercised, then our existing stockholders, including the holders of these options, would own % and our new investors would own % of the total number of shares of our Class A, Class B and Class C common stock outstanding upon the closing of this offering. In such event, the total consideration paid by our existing stockholders, including the holders of these options, would be approximately $ million, or %, the total consideration paid by our new investors would be $ million, or %, the average price per share paid by our existing stockholders would be $ and the average price per share paid by our new investors would be $ .

The following selected consolidated financial data should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our audited consolidated financial statements and related notes, which are included elsewhere in this prospectus. The consolidated statements of operations data for the years ended December 31, 2008, 2009 and 2010 as well as the consolidated balance sheet data as of December 31, 2009 and 2010 are derived from the audited consolidated financial statements that are included elsewhere in this prospectus. The consolidated statements of operations data for the six months ended June 30, 2010 and 2011, and the consolidated balance sheet data as of June 30, 2011 have been derived from our unaudited consolidated financial statements appearing elsewhere in this prospectus. We have included, in our opinion, all adjustments, consisting only of normal recurring adjustments, that we consider necessary for a fair presentation of the financial information set forth in those statements. The consolidated statement of operations data for the period from inception (April 19, 2007) to December 31, 2007, as well as the consolidated balance sheet data as of December 31, 2007 and 2008, are derived from audited consolidated financial statements that are not included in this prospectus. Our historical results are not necessarily indicative of the results to be expected in the future, and our interim results are not necessarily indicative of the results to be expected for the full fiscal year.

Stock-based compensation included in the statements of operations data above was as follows:

Bookings is a non-GAAP financial measure that we define as the total amount of revenue from the sale of virtual goods in our online games and advertising that would have been recognized in a period if we recognized all revenue immediately at the time of the sale. We record the sale of virtual goods as deferred revenue and then recognize revenue over the estimated average life of the purchased virtual goods or as the virtual goods are consumed. Advertising revenue consisting of certain branded virtual goods and sponsorships is also deferred and recognized over the estimated average life of the purchased good, similar to online game revenue. Bookings is calculated as revenue recognized in a period plus the change in deferred revenue during the period. For additional discussion of the estimated average life of virtual goods, see the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Revenue Recognition.”

We use bookings to evaluate the results of our operations, generate future operating plans and assess the performance of our company. While we believe that this non-GAAP financial measure is useful in evaluating our business, this information should be considered as supplemental in nature and is not meant as a substitute for revenue recognized in accordance with GAAP. In addition, other companies, including companies in our industry, may calculate bookings differently or not at all, which reduces its usefulness as a comparative measure.

The following table presents a reconciliation of revenue to bookings for each of the periods indicated:

In July 2010, we began migrating to Facebook Credits as the primary payment method for our games played through Facebook, and by April 2011, we had completed this migration. Facebook remits to us an amount equal to 70% of the face value of Facebook Credits purchased by our players for use in our games. We record bookings and recognize revenue net of amounts retained by Facebook. If we had been subject to Facebook Credits beginning January 1, 2009, we estimate our bookings would have been approximately $80 million, $150 million, $100 million and $20 million lower than actual results in 2009, 2010 and in the six months ended June 30, 2010 and 2011, respectively, by assuming a 30% reduction in estimated bookings generated from payment methods that were replaced by Facebook Credits.

We have included adjusted EBITDA in this prospectus because it is a key measure we use to evaluate our operating performance, generate future operating plans, and make strategic decisions for the allocation of capital. Accordingly, we believe that adjusted EBITDA provides useful information to investors and others in understanding and evaluating our operating results in the same manner as our management and board of directors. While we believe that this non-GAAP financial measure is useful in evaluating our business, this information should be considered as supplemental in nature and is not meant as a substitute for the related financial information prepared in accordance with GAAP.

The following table presents a reconciliation of net income (loss) to adjusted EBITDA for each of the periods indicated:

Because of these limitations, you should consider bookings and adjusted EBITDA alongside other financial performance measures, including revenue, net income (loss) and our financial results presented in accordance with GAAP.

You should read the following discussion of our financial condition and results of operations in conjunction with the consolidated financial statements and the related notes included elsewhere in this prospectus. The following discussion contains forward-looking statements that reflect our plans, estimates and beliefs. Our actual results could differ materially from those discussed in the forward-looking statements. Factors that could cause or contribute to these differences include those discussed below and elsewhere in this prospectus, particularly in “Risk Factors.”

We are the world’s leading online social game developer with 232 million average MAUs in 166 countries. We have launched the most successful social games in the industry in each of the last three years and generated over $1.25 billion in cumulative revenue and over $1.75 billion in cumulative bookings since our inception in 2007. Our games are accessible on Facebook, other social networks and mobile platforms to players worldwide, wherever and whenever they want. All of our games are free to play, and we generate revenue through the in-game sale of virtual goods and advertising.

We are a pioneer and innovator of social games and a leader in making play a core activity on the Internet. We believe our leadership position in social games is the result of our significant investment in our people, content, brand, technology and infrastructure. Highlights in our history include:

In 2010, our revenue and bookings were $597.5 million and $838.9 million, respectively, which represented increases from 2009 of $476.0 million and $510.8 million, respectively. Consistent with our free-to-play business model, historically less than 5% of our players have been paying players. Because the opportunity for social

interactions increases as the number of players increases, we believe that maintaining and growing our overall number of players, including the number of players who may not purchase virtual goods, is important to the success of our business. As a result, we believe that the number of players who choose to purchase virtual goods will continue to constitute a small percentage of our overall players as our business grows.

Our top three games vary over time but historically have contributed the majority of our revenue. Our top three games accounted for 93%, 83%, 78% and 59% of our online game revenue in 2008, 2009, 2010 and for the six months ended June 30, 2011, respectively. The reduction in percentage of online game revenue related to our top three games occurred throughout these periods as new games were launched and we recognized revenue from these games. Historically, our most popular games have generated revenue and bookings for a significant period of time after their release. Bookings from our games launched prior to December 31, 2009 have remained relatively constant quarter to quarter since the first quarter of 2010. Bookings from these games during the second quarter of 2011 were 92% of the bookings from these games during the first quarter of 2010. During the first six months of 2011 bookings from these games were 96% of the bookings from these games during the same period of 2010.

We are making significant investments in 2011 to drive long-term growth. We continue to invest in game development, creating both new games and new features and content in existing games designed to engage our players. We are also investing in other key areas of our business, including international market development, mobile games and our technology infrastructure. During the second half of 2011, we expect to make capital expenditures of approximately $100 million to $150 million as we invest in network infrastructure to support our expected growth and to continue to improve the player experience.

We operate our games as live services that allow players to play for free. We generate revenue primarily from the in-game sale of virtual goods and advertising.

Online Game. We provide our players with the opportunity to purchase virtual goods that enhance their game-playing experience. We believe players choose to pay for virtual goods for the same reasons they are willing to pay for other forms of entertainment. They enjoy the additional playing time or added convenience, the ability to personalize their own game boards, the satisfaction of leveling up and the opportunity for sharing creative expressions. We believe players are more likely to purchase virtual goods when they are connected to and playing with their friends, whether those friends play for free or also purchase virtual goods.

In May 2010, we entered into an addendum to Facebook’s standard terms and conditions requiring us to transition our payment method to Facebook Credits, Facebook’s proprietary payment method, as the primary means of payment within our games played through Facebook. We began migrating to Facebook Credits in July 2010, and by April 2011, we had completed this migration. Under this addendum, Facebook remits to us an amount equal to 70% of the face value of Facebook Credits purchased by our players for use in our games. We recognize revenue net of amounts retained by Facebook. Prior to this addendum, we used third-party payment processors and paid these processors service fees ranging from 2% to 10% of the purchase price of our virtual goods which were recorded in cost of revenue. Players can purchase Facebook Credits from Facebook, directly through our games or through game cards purchased from retailers and distributors.

On platforms other than Facebook, players purchase our virtual goods through various widely accepted payment methods offered in the games, including credit cards, PayPal, Apple iTunes accounts and direct wires. Players can purchase game cards from retailers and distributors for use on these platforms.

Advertising. Advertising revenue primarily includes branded virtual goods, sponsorships and engagement ads. We generally report our advertising revenue net of amounts due to advertising agencies and brokers.

Revenue growth will depend largely on our ability to attract and retain players and more effectively monetize our player base through the sale of virtual goods and advertising. We intend to do this through the launch of new games, enhancements to current games and expansion into new markets and distribution platforms.

We regularly review a number of metrics, including the following key metrics, to evaluate our business, measure our performance, identify trends in our business, prepare financial projections and make strategic decisions.

Bookings. Bookings is a non-GAAP financial measure that we define as the total amount of revenue from the sale of virtual goods in our online games and advertising that would have been recognized in a period if we recognized all revenue immediately at the time of the sale. Bookings, as opposed to revenue, is the fundamental top-line metric we use to manage our business, as it reflects the sales activity in a given period. Annual bookings grew by $292.2 million from $35.9 million in 2008 to $328.1 million in 2009, and by $510.8 million to $838.9 million from 2009 to 2010. For a reconciliation of revenue to bookings, see the section titled “—Quarterly Results of Operations.”

Adjusted EBITDA. Adjusted EBITDA is a non-GAAP financial measure that we calculate as net income (loss), adjusted for provision for income taxes; other income (expense), net; interest income; gain (loss) from legal settlements; depreciation and amortization; stock-based compensation and change in deferred revenue. We believe that adjusted EBITDA provides useful information to investors and others in understanding and evaluating our operating results in the same manner as our management and board of directors. For a reconciliation of net income (loss) to adjusted EBITDA, see the section titled “—Quarterly Results of Operations.”

We manage our business by tracking several operating metrics: “DAUs,” which measures daily active users of our games, “MAUs,” which measures monthly active users of our games, “MUUs,” which measures monthly unique users of our games, and ABPU, which measures our average daily bookings per average DAU, each of which is recorded by our internal analytics systems.

DAUs. We define DAUs as the number of individuals who played one of our games during a particular day. Under this metric, an individual who plays two different games on the same day is counted as two DAUs. Similarly, an individual who plays the same game on two different platforms (e.g., web and mobile) or on two different social networks on the same day would be counted as two DAUs. Average DAUs for a particular period is the average of the DAUs for each day during that period. We use DAU as a measure of audience engagement.

MAUs. We define MAUs as the number of individuals who played a particular game in the 30-day period ending with the measurement date. Under this metric, an individual who plays two different games in the same 30-day period is counted as two MAUs. Similarly, an individual who plays the same game on two different platforms (e.g., web and mobile) or on two different social networks in a 30-day period would be counted as two MAUs. Average MAUs for a particular period is the average of the MAUs at each month-end during that period. We use MAU as a measure of total game audience size.

MUUs. We define MUUs as the number of unique individuals who played any of our games on a particular platform in the 30-day period ending with the measurement date. An individual who plays more than one of our games in a given 30-day period would be counted as a single MUU. However, because we cannot distinguish unique individuals playing across multiple platforms, an individual who plays any of our games on two different platforms (e.g., web and mobile) in a given 30-day period would be counted as two MUUs. Because many of our players play more than one game in a given 30-day period, MUUs are always lower than MAUs in any given time period. Average MUUs for a particular period is the average of the MUUs at each month-end during that period. We use MUU as a measure of total audience reach across our network of games.

Average Bookings per User (ABPU). We define ABPU as (i) our total bookings in a given period, divided by (ii) the number of days in that period, divided by, (iii) the average DAUs during the period. We believe that ABPU provides useful information to investors and others in understanding and evaluating our results in the same manner as our management and board of directors. We use ABPU as a measure of overall monetization across all of our players through the sale of virtual goods and advertising.

In the letter from our founder included in this prospectus, the term “daily active users” means the average of our DAUs for each day during the period January 1, 2011 through June 30, 2011, and the term “monthly unique users” means the average of our MUUs as of the end of each of the first six months of 2011.

Our user metrics are impacted by several factors that cause them to fluctuate on a quarterly basis. Beginning in early 2010, Facebook changed its policies for application developers regarding use of its communication channels. These changes limited the level of communication among users about applications on the Facebook platform, which we believe contributed to a decline in our bookings and number of players throughout 2010. In addition, our bookings and revenue growth rates declined throughout 2010 and the six months ended June 30, 2011 due to our adoption of Facebook Credits as the primary payment method on Facebook. We account for Facebook Credits net of amounts retained by Facebook. Our DAUs, MAUs and MUUs all increased in the three months ended March 31, 2011, primarily due to the launch of CityVille in December 2010, the addition of new content to existing games and the launch of several mobile initiatives. Future growth in audience and engagement will depend on our ability to retain current players, attract new players, launch new games and expand into new markets and distribution platforms.

Our operating metrics may not correlate directly to quarterly bookings or revenue trends in the short term. For instance, revenue has grown every quarter since our inception, including in quarters where DAU, MAU and MUU did not grow.

Launch of new games and release of enhancements. Our bookings and revenue growth have been driven by the launch of new games and the release of fresh content and new features in existing games. For a summary of key game launch dates and other significant events, see the section titled “Overview” above. Although the amount of revenue and bookings we generate from a new game or an enhancement to an existing game can vary significantly, we expect our revenue and bookings growth to be correlated to the success of our new games and our success in releasing engaging content and features.

Game monetization. We generate most of our revenue from the sale of virtual goods in our games. The degree to which our players choose to pay for virtual goods in our games is driven by our ability to create content and virtual goods that enhance the game-play experience. Our revenue and overall financial performance is affected by the number of players and the effectiveness of the monetization of players through the sale of virtual goods and advertising. In addition, international players have historically lagged the monetization that we achieve for U.S. players and the percentage of paying international players may increase or decrease based on a number of factors, including growth in overall international players, localization of content and the availability of payment options.

Changes in Facebook or other platforms. Facebook is the primary distribution, marketing, promotion and payment platform for our social games. We generate substantially all of our bookings, revenue and players through the Facebook platform and expect to continue to do so for the foreseeable future. Facebook and other platforms have broad discretion to change their platforms, terms of service and other policies with respect to us or other developers, and those changes may be unfavorable to us.

Investment in game development. In order to develop new games and enhance the content and features in our existing games, we must invest a significant amount of engineering and creative resources. These expenditures generally occur months in advance of the launch of a new game or the release of new content, and the resulting revenue may not equal or exceed our development costs.

Hosting costs. To date, we have primarily utilized third-party web hosting services to operate our games. During periods of higher-than-expected player activity, when we exceeded our committed capacity, our costs have increased as we were required to purchase more expensive temporary capacity. We intend to invest in our network infrastructure, with the goal of reducing our reliance on third-party web hosting services and moving towards the use of self-operated data centers. Under this approach, we would host an increasing amount of data and traffic for our games on servers located in the data centers which we lease, build and operate. Investment in our network infrastructure will require capital expenditures for equipment. We believe that over the long term this investment will produce further operating leverage by reducing our game operation costs and will enhance our games and player experience. As we continue to grow, the capital investment necessary to build our infrastructure will be significant.

Player acquisition costs. Although we acquire most of our players through unpaid channels, we also utilize advertising and other forms of player acquisition and retention to grow and retain our player audience. These expenditures generally relate to the promotion of new game launches and ongoing performance-based programs to drive new player acquisition and lapsed player reactivation. Over time, these acquisition and retention-related programs may become either less effective or more costly, negatively impacting our operating results.

New market development. We are investing in new distribution channels such as mobile and other platforms, including other social networks and in international markets to expand our reach and grow our business. For example, we have continued to hire additional employees and acquire companies with experience developing mobile applications. We have also invested resources in integrating and operating some of our games on additional platforms, including Yahoo!, mixi and Tencent. As we expand into new markets and distribution channels, we expect to incur headcount, marketing and other operating costs in advance of the associated bookings and revenue. Our financial performance will be impacted by our investment in these initiatives and their success.

Vesting of ZSUs. We have granted restricted stock units, or ZSUs, to our employees that generally vest upon the satisfaction of both a service-period condition of up to four years and a liquidity condition. Because the liquidity condition is not met until the occurrence of a qualifying liquidity event (an initial public offering or change of control), we have not recorded any expense to date relating to our ZSU grants. In connection with the initial public offering, we will begin recording stock compensation expense based on the grant date fair value of the ZSUs using the accelerated attribution method. If the initial public offering had occurred on June 30, 2011, we would have recorded $253.3 million of stock-based compensation expense on that date related to ZSUs and would have had an additional $523.0 million in unamortized stock-based compensation expense related to ZSUs.

Cost of revenue. Our cost of revenue consists primarily of web hosting and data center costs related to operating our games, including: depreciation and amortization; consulting costs primarily related to third-party provisioning of customer support services; payment processing fees; and salaries, benefits and stock-based compensation for our customer support and infrastructure teams. Our infrastructure team includes our network operations and payment platform teams. Credit card processing fees, allocated facilities costs and other supporting overhead costs are also included in cost of revenue. We expect cost of revenue to increase for the foreseeable future as we expand our data center capacity and headcount associated with player support.

Research and development. Our research and development expenses consist primarily of salaries, benefits and stock-based compensation for our engineers and developers. In addition, research and development expenses include outside services and consulting, as well as allocated facilities and other supporting overhead costs. We believe continued investment in enhancing existing games and developing new games, and in software development tools and code modification, is important to attaining our strategic objectives. As a result, we expect research and development expenses to increase for the foreseeable future as we grow our business.

Sales and marketing. Our sales and marketing expenses consist primarily of player acquisition costs, which are advertisements designed to drive players into our games, salaries, benefits and stock-based compensation for our sales and marketing employees and fees paid to consultants. In addition, sales and marketing expenses include general marketing, branding, advertising and public relations costs, as well as allocated facilities and other supporting overhead costs. We plan to continue to invest in sales and marketing to grow our player base and continue building brand awareness. As a result, we expect sales and marketing expenses to increase for the foreseeable future as we grow our business.

General and administrative. Our general and administrative expenses consist primarily of salaries, benefits and stock-based compensation for our executive, finance, legal, information technology, human resources and other administrative employees. In addition, general and administrative expenses include outside consulting, legal and accounting services, charitable donations and facilities and other supporting overhead costs not allocated to other departments. General and administrative expenses also include gains and losses associated with legal settlements. We expect that our general and administrative expenses will increase for the foreseeable future as we continue to grow our business and incur additional expenses associated with being a publicly-traded company.

The following table sets forth our results of operations for the periods presented as a percentage of revenue for those periods.

Total revenue increased $291.0 million from the six months ended June 30, 2010 to the six months ended June 30, 2011, as a result of growth in both online and advertising revenue. Bookings increased by $188.3 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. ABPU increased from $0.033 to $0.051, reflecting improved overall monetization of our players, while DAUs decreased from 64 million to 60 million.

Online game revenue increased $271.5 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. CityVille (launched in December 2010), FarmVille (launched in June 2009) and FrontierVille (launched in June 2011) accounted for $193.7 million of the increase. The adoption of Facebook Credits as our primary in-game payment method beginning in the third quarter of 2010 negatively impacted online game revenue in the six months ended June 30, 2011. International revenue as a percentage of total revenue increased from 31% in the six months ended June 30, 2010 to 34% in the six months ended June 30, 2011.

The estimated weighted-average life of durable and consumable virtual goods included in bookings during the six months ended June 30, 2010 was 14 months compared to 11 months for the six months ended June 30, 2011. In the six months ended June 30, 2011, online game revenue increased $27.3 million related to changes in our estimated average life of durable virtual goods.

Advertising revenue increased $19.5 million from the six months ended June 30, 2010 to the six months ended June 30, 2011, due to a $12.2 million increase in in-game offers, sponsorships and engagement ads, and a $7.3 million increase in other advertising activity. In the fourth quarter of 2009, we discontinued certain in-game offers in order to improve player experience, and although we resumed and gradually increased in-game offers in the six months ended June 30, 2010, our advertising revenue for the six months ended June 30, 2010 was negatively impacted compared to the six months ended June 30, 2011, which had in-game offers for the entire period.

Cost of revenue increased $71.2 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. The increase was primarily attributable to an increase in hosting costs of $41.9 million to support additional games and player activity, a $22.1 million increase in depreciation and amortization related to depreciation of new fixed assets and amortization of acquired intangibles, a $9.9 million increase in consulting costs primarily related to third-party customer support necessitated by higher player activity and a $6.4 million increase in headcount-related expenses for our infrastructure groups to support the growth of our business. Payment processing fees decreased by $4.7 million during the six months ended June 30, 2011 compared to the six months ended June 30, 2010, due to our transition to Facebook Credits beginning in the third quarter of 2010. We account for revenue from the redemption of Facebook Credits net of amounts retained by Facebook.

Research and development expenses increased $109.3 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. The increase was primarily attributable to a $91.7 million increase in headcount-related expenses and a $8.1 million increase in consulting costs due to the ongoing investment in new game development, in addition to an increase in allocated facilities and other overhead support costs of $6.7 million.

Sales and marketing expenses increased $31.3 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. The increase was primarily attributable to a $16.3 million increase in player acquisition costs and an increase in headcount-related expenses of $10.5 million.

General and administrative expenses increased $49.7 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. The increase was primarily attributable to a $24.3 million increase in headcount-related expenses, $10.6 million in stock-based compensation expenses related to a common stock warrant issued in June 2011, a $4.4 million increase in information technology costs, a $3.6 million increase in facilities and overhead expenses and a $3.1 million increase in depreciation expense.

Interest income increased $0.7 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. The increase was primarily attributable to the increase in our cash and marketable securities balance driven by the increase in cash flows from operations and proceeds from the sale and issuance of Series C preferred stock in February 2011.

Other income (expense), net decreased $2.1 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. The decrease was primarily attributable to losses due to foreign exchange rate changes.

The provision for income taxes increased $30.3 million from the six months ended June 30, 2010 to the six months ended June 30, 2011. This increase was attributable to the increase in pre-tax income of $28.1 million in the six months ended June 30, 2011 compared to the six months ended June 30, 2010 and the realization of deferred tax assets from prior periods that offset current tax expense in 2010. In addition, the provision for income taxes at June 30, 2011 was higher as a result of an increase in non-deductible stock-based compensation expense and the initial implementation costs of our international tax structure, offset by tax credits and a favorable change in our jurisdictional mix of income, which provides for income earned in foreign tax jurisdictions to be taxed at lower income tax rates.

For the foreseeable future, our effective tax rate will be impacted by significant post-IPO stock-based compensation expense and additional tax expense associated with the implementation of our international tax structure. Following our IPO, we expect stock-based compensation expense to generate significant tax benefits which may be deducted against future income. As these deductions are recognized and the implementation of our international tax structure is completed, we anticipate that our effective tax rate will be lower than the U.S. statutory rate.

2009 Compared to 2010. Total revenue increased $476.0 million from 2009 to 2010, as a result of growth in both online game and advertising revenues. Bookings increased by $510.8 million from 2009 to 2010. ABPU increased from $0.035 to $0.041, reflecting improved overall monetization of our players, while DAUs increased from 41 million to 56 million. ABPU data for 2009 only includes data from July to December as prior months are not available.

The increase in online game revenue of $488.9 million was driven primarily by FarmVille (launched in June 2009), Mafia Wars (launched in June 2008) and Zynga Poker (launched in July 2007) which accounted for $381.1 million of this increase.

The estimated weighted-average life of durable and consumable virtual goods included in bookings during 2009 was 18 months compared to 13 months during 2010. This change in weighted average lives for all virtual goods was largely due to our ability in late 2009 and early 2010 to track separately consumable virtual goods from durable virtual goods, allowing us to recognize consumable virtual goods as they were consumed. This ability to separately track consumable virtual goods was a significant contributor to our revenue growth in 2009 versus 2010. Had we not been able to track consumable virtual goods separately and experienced a similar weighted average life for all virtual goods in 2010 was we did in 2009, we would have recognized approximately $125.0 million less in revenue in 2010.

Advertising revenue decreased $12.9 million as we reduced the volume of in-game offers in order to improve player experience. International revenue as a percentage of total revenue was 14%, 27% and 33% in 2008, 2009 and 2010, respectively. These increases were primarily due to more international payment options, additional localized content and more demand for our games internationally.

2008 Compared to 2009. Total revenue increased $102.1 million from 2008 to 2009. Bookings increased by $292.1 million from 2008 to 2009 and increased in every quarter due to the launch of several new games, as well as new content added to existing games.

Online game revenue increased $80.5 million as we recognized revenue from bookings generated throughout 2008 and 2009. Mafia Wars (launched in June 2008), YoVille (launched in 2008) and Zynga Poker (launched in July 2007), accounted for $66.0 million of the increase. The estimated weighted-average life of durable and consumable virtual goods included in bookings during 2008 was 15 months compared to 18 months for 2009. Advertising revenue increased $21.6 million due to player growth and an increase in in-game offers.

2009 Compared to 2010. Cost of revenue increased $119.3 million from 2009 to 2010. The increase was primarily attributable to an increase of $47.6 million in hosting costs to support additional games and increased player activity, an increase of $23.9 million in depreciation and amortization expense related to depreciation of new fixed assets and amortization of intangibles acquired in business acquisitions, an increase of $18.0 million in consulting costs primarily related to third-party customer support necessitated by higher player activity, and an increase of $13.4 million in headcount-related costs for our technology and customer support groups to support the growth of our business. In addition, payment processing fees increased by $9.6 million.

2008 Compared to 2009. Cost of revenue increased $46.7 million from 2008 to 2009. The increase was primarily attributable to an increase of $14.3 million in hosting costs to support new games and increased player activity, an increase of $12.8 million in payment processing fees as a result of increased payment transactions, and an increase of $7.4 million in headcount-related costs for our technology and customer support groups in order to support our ongoing investment in game development and enhancements.

2009 Compared to 2010. Research and development expenses increased $98.5 million from 2009 to 2010. The increase was primarily attributable to an increase of $77.9 million in headcount-related expenses and an increase of $8.2 million in third-party design expenses related to game development and an increase of $8.9 million in allocated facilities and overhead support costs.

2008 Compared to 2009. Research and development expenses increased $38.9 million from 2008 to 2009. The increase was primarily attributable to an increase of $29.5 million in headcount-related expenses related to game development.

2009 Compared to 2010. Sales and marketing expenses increased $71.9 million from 2009 to 2010. The increase was primarily attributable to an increase of $44.5 million in player acquisition costs, an increase of $18.7 million in headcount-related costs and an increase of $5.5 million in general marketing expenses related to new marketing and brand programs.

2008 Compared to 2009. Sales and marketing expenses increased $31.3 million from 2008 to 2009. The increase was primarily attributable to an increase of $26.3 million in player acquisition costs and an increase of $3.2 million in headcount-related expenses.

2009 Compared to 2010. General and administrative expenses increased $8.0 million from 2009 to 2010. The increase was primarily attributable to an increase of $22.8 million in headcount-related expenses, an increase of $14.0 million in professional service costs, a $4.8 million increase in depreciation expense and a $2.5 million increase in information technology costs to support the growth of our business. These increased expenses were offset by a net gain from legal settlements of $39.3 million.

2008 Compared to 2009. General and administrative expenses increased $15.4 million from 2008 to 2009. The increase was primarily attributable to an increase of $13.2 million in professional services associated with ongoing litigation and an increase of $10.3 million in headcount-related expenses related to the support of the growth of our business. In 2008, we recorded $7.0 million of general and administrative expenses related to a legal settlement.

2009 Compared to 2010. Interest income increased $1.0 million from 2009 to 2010 primarily due to the increase in our cash and marketable securities balance driven by the increase in cash flows from operations and cash from financing activities, including proceeds from the sale and issuance of Series B-2 preferred stock in the second quarter of 2010.

2008 Compared to 2009. Interest income decreased $0.1 million primarily due to the decrease in interest rates during 2009.

2009 Compared to 2010. Other income (expense), net increased $0.6 million from 2009 to 2010 primarily due to an increase in net transaction gain on foreign exchange rate changes.

2008 Compared to 2009. Other income (expense), net decreased $0.4 million from 2008 to 2009 primarily due to a net transaction loss on foreign exchange rate changes.

2009 Compared to 2010. Provision for income taxes increased $36.5 million from 2009 to 2010, primarily as a result of the increase in pre-tax income in 2010 from a pre-tax loss in 2009. In 2010, we recorded a provision for income taxes that was principally attributable to U.S. federal taxes, California taxes and foreign taxes. The effective tax rate for 2010 was 28.7%. The increase in our annual effective tax rate for 2010 was driven by the implementation cost of our international tax structure, state income taxes and non-deductible stock compensation expense. These increases were offset by the benefit of releasing the federal valuation allowance in 2010 due to our achievement of profitability, and by the utilization of both federal and California research and development credits.

Before we began forming non-U.S. operating companies during 2010, the revenue from non-U.S. users was earned by our U.S. company, resulting in virtually no foreign profit before tax. The new foreign entities, as start-up companies, generated operating losses in 2010. The tax impact of the losses generated in tax jurisdictions with lower statutory rates than the U.S. rate increased tax expense and the effective tax rate.

2008 Compared to 2009. In 2008 and 2009, we recorded income taxes that were principally attributable to the California minimum franchise tax and foreign taxes.

The following tables set forth our unaudited quarterly consolidated statements of operations data in dollars and as a percentage of revenue for each of the ten quarters ended June 30, 2011 (certain items may not reconcile due to rounding). We also present other financial and operations data, and a reconciliation of revenue to bookings and net income (loss) to adjusted EBITDA, for the same periods. We have prepared the quarterly consolidated statements of operations data on a basis consistent with the audited consolidated financial statements included in this prospectus. In the opinion of management, the financial information reflects all adjustments, consisting only of normal recurring adjustments, that we consider necessary for a fair presentation of this data. This information should be read in conjunction with the audited consolidated financial statements and related notes included elsewhere in this prospectus. The results of historical periods are not necessarily indicative of the results of operations for a full year or any future period.


Large accelerated filer	¨	Accelerated filer	¨
Non-accelerated filer	x (Do not check if a smaller reporting company)	Smaller reporting company	¨


	*Price to* *Public*	*Underwriting* *Discounts and* *Commissions*	*Proceeds to* *Zynga*	*Proceeds to* *Selling* *Stockholders*
Per Share	$	$	$	$
Total	$	$	$	$


	Page
Management		95
Executive Compensation		101
Certain Relationships and Related Person Transactions		126
Principal and Selling Stockholders		130
Description of Capital Stock		134
Shares Eligible for Future Sale		140
Material United States Federal Income Tax Consequences to Non-U.S. Holders of Our Class A Common Stock		142
Underwriting		145
Legal Matters		151
Experts		151
Where You Can Find More Information		151
Index to Consolidated Financial Statements		F-1


	As of June 30, 2011
	Actual			Pro Forma			Pro Forma As Adjusted⁽¹⁾
	(in thousands, except per share data)
Class B common stock, $0.00000625 par value, 998,576 shares authorized, 261,394 shares issued and outstanding, actual; shares authorized, shares issued and outstanding, pro forma; shares authorized, shares issued and outstanding, pro forma as adjusted		2
Class C common stock, $0.00000625 par value, 20,517 shares authorized, issued and outstanding, actual, pro forma and pro forma as adjusted		—			—
Additional paid-in capital		111,822
Treasury stock		(282,754	)		(282,754	)
Other comprehensive income		(26	)		(26	)
Retained earnings (deficit)		28,371			(224,929	)

Total stockholders’ equity		755,896

Total capitalization	$	1,720,356		$			$


Assumed initial public offering price per share		$
Pro forma as adjusted net tangible book value per share as of June 30, 2011	$
Increase in pro forma as adjusted net tangible book value per share attributed to new investors purchasing shares from us in this offering

Pro forma net tangible book value per share after giving effect to this offering

Dilution in pro forma net tangible book value per share to new investors in this offering		$


	Page
Prospectus Summary		1
Risk Factors		14
Letter From Our Founder		32
Special Note Regarding Forward-Looking Statements		34
Market Data and User Metrics		35
Use of Proceeds		36
Dividend Policy		36
Capitalization		37
Dilution		39
Selected Consolidated Financial Data		41
Management’s Discussion and Analysis of Financial Condition and Results of Operations		47
Business		73


	Shares Purchased				Total Consideration				Average Price Per Share
	Number	Percent			Amount	Percent			Average Price Per Share
	(dollars in thousands, except per share data)
Existing stockholders				%	$			%	$
New investors				%				%

Total			100.0	%			100.0	%


	Period from Inception (April 19, 2007) to December 31, 2007			Year Ended December 31,									Six Months Ended June 30,
				2008			2009			2010			2010			2011
				(dollars in thousands, except per share and ABPU data)
Consolidated Statements of Operations Data:
Revenue	$	693		$	19,410		$	121,467		$	597,459		$	231,026		$	522,034
Costs and expenses:
Cost of revenue		189			10,017			56,707			176,052			74,547			145,738
Research and development		869			12,160			51,029			149,519			58,237			167,507
Sales and marketing		231			10,982			42,266			114,165			46,928			78,254
General and administrative		277			8,834			24,243			32,251			31,582			81,328

Total costs and expenses		1,566			41,993			174,245			471,987			211,294			472,827
Income (loss) from operations		(873	)		(22,583	)		(52,778	)		125,472			19,732			49,207
Interest income		22			319			177			1,222			303			961
Other income (expenses), net		8			187			(209	)		365			1,531			(536	)

Income (loss) before income taxes		(843	)		(22,077	)		(52,810	)		127,059			21,566			49,632
Provision for income taxes		(3	)		(38	)		(12	)		(36,464	)		(1,180	)		(31,483	)

Net income (loss)	$	(846	)	$	(22,115	)	$	(52,822	)	$	90,595		$	20,386		$	18,149

Deemed dividend to a Series B-2 convertible preferred stockholder		—			—			—			4,590			4,590			—
Net income attributable to participating securities		—			—			—			58,110			11,826			18,149

Net income (loss) attributable to Class B and Class C common stockholders⁽¹⁾	$	(846	)	$	(22,115	)	$	(52,822	)	$	27,895		$	3,970		$	—

Net income (loss) per share attributable to Class B and Class C common stockholders⁽¹⁾⁽²⁾:
Basic	$	(0.06	)	$	(0.18	)	$	(0.31	)	$	0.12		$	0.02		$	0.00

Diluted	$	(0.06	)	$	(0.18	)	$	(0.31	)	$	0.11		$	0.02		$	0.00

Weighted average Class B and Class C common shares used to compute net income (loss) per share attributable to common stockholders⁽¹⁾:
Basic		14,255			119,990			171,751			223,881			207,536			260,414

Diluted		14,255			119,990			171,751			329,256			315,054			260,414

Pro forma net income per share attributable to Class B and Class C common stockholders⁽¹⁾⁽²⁾:
Basic										$						$

Diluted										$						$

Pro forma weighted-average shares used to compute pro forma net income (loss) per share attributable to Class B and Class C common stockholders⁽¹⁾⁽²⁾(unaudited):
Basic

Diluted

Other Financial and Operational Data:
Bookings⁽³⁾	$	1,351		$	35,948		$	328,070		$	838,896		$	373,014		$	561,341
Adjusted EBITDA⁽⁴⁾	$	(185	)	$	4,549		$	168,187		$	392,738		$	187,346		$	177,343
Average DAUs (in millions)⁽⁵⁾		NA			NA			41			56			64			60
Average MAUs (in millions)⁽⁶⁾		NA			NA			153			217			235			232
Average MUUs (in millions)⁽⁷⁾		NA			NA			86			116			121			149
ABPU⁽⁸⁾		NA			NA		$	0.035		$	0.041		$	0.033		$	0.051


	Period from Inception (April 19, 2007) to December 31, 2007		Year Ended December 31,						Six Months Ended June 30,
			2008		2009		2010		2010		2011
			(in thousands)
Cost of revenue	$	—	$	22	$	443	$	2,128	$	960	$	1,087
Research and development		17		226		1,817		10,242		2,854		23,941
Sales and marketing		—		381		518		7,899		4,208		7,771
General and administrative		3		60		1,212		5,425		2,554		14,818

Total stock-based compensation	$	20	$	689	$	3,990	$	25,694	$	10,576	$	47,617


	As of December 31,									As of June 30, 2011
	2007		2008		2009			2010		As of June 30, 2011
	(in thousands)
Consolidated Balance Sheet Data:
Cash, cash equivalents and marketable securities	$	5,731	$	35,558	$	199,958		$	738,090	$	964,460
Property and equipment, net		267		4,052		34,827			74,959		171,697
Working capital		4,719		8,378		(12,496	)		385,564		503,428
Total assets		6,016		45,367		258,848			1,112,572		1,489,480
Deferred revenue		658		17,196		223,799			465,236		504,543
Total stockholders’ equity (deficit)		4,756		12,995		(21,478	)		482,215		755,896


	For The Year Ended December 31,									Six Months Ended June 30,
	2008			2009			2010			2010			2011
Consolidated Statements of Operations Data:
Revenue		100	%		100	%		100	%		100	%		100	%
Costs and expenses:
Cost of revenue		52			47			29			32			28
Research and development		63			42			25			25			32
Sales and marketing		57			35			19			20			15
General and administrative		44			19			6			14			16

Total costs and expenses		216			143			79			91			91
Income (loss) from operations		(116	)		(43	)		21			9			9
Interest income		2			—			—			—			—
Other income (expense), net		—			—			—			1			—

Income (loss) before income taxes		(114	)		(43	)		21			10			9
Provision for income taxes		—			—			(6	)		(1	)		(6	)

Net income (loss)		(114	)%		(43	)%		15	%		9	%		3	%


	Six Months Ended June 30,				% Change
	2010		2011		% Change
	(dollars in thousands)
Revenue by type:
Online game	$	222,413	$	493,872		122	%
Advertising		8,613		28,162		227	%

Total	$	231,026	$	522,034		126	%


	Year Ended December 31,						2008 to 2009 % Change			2009 to 2010 % Change
	2008		2009		2010		2008 to 2009 % Change			2009 to 2010 % Change
	(dollars in thousands)
Revenue by type:
Online game	$	5,272	$	85,748	$	574,632		1,526	%		570	%
Advertising		14,138		35,719		22,827		153	%		(36	)%

Total	$	19,410	$	121,467	$	597,459		526	%		392	%


	For the Three Months Ended
	Mar 31, 2009			Jun 30, 2009			Sep 30, 2009			Dec 31, 2009			Mar 31, 2010		Jun 30, 2010		Sep 30, 2010		Dec 31, 2010			Mar 31, 2011		Jun 30, 2011
	(in thousands)
Consolidated Statements of Operations Data:
Revenue	$	15,531		$	18,904		$	31,311		$	55,721		$	100,927	$	130,099	$	170,674	$	195,759		$	242,890	$	279,144
Costs and expenses:
Cost of revenue		4,467			8,943			16,191			27,106			32,911		41,636		49,902		51,603			67,662		78,076
Research and development		6,603			9,141			14,302			20,983			27,851		30,386		39,782		51,500			71,760		95,747
Sales and marketing		4,687			6,324			10,987			20,268			17,398		29,530		28,957		38,280			40,156		38,098
General and administrative		1,636			3,654			6,952			12,001			16,452		15,130		17,757		(17,088	)		27,110		54,218

Total costs and expenses		17,393			28,062			48,432			80,358			94,612		116,682		136,398		124,295			206,688		266,139
Income (loss) from operations	$	(1,862	)	$	(9,158	)	$	(17,121	)	$	(24,637	)	$	6,315	$	13,417	$	34,276	$	71,464		$	36,202	$	13,005

Net income (loss)	$	(1,761	)	$	(9,250	)	$	(17,264	)	$	(24,547	)	$	6,435	$	13,951	$	27,217	$	42,992		$	16,758	$	1,391


MORGAN STANLEY		GOLDMAN, SACHS & CO.