RISK FACTORS

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 the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements and related notes, before making a decision to invest in our Class A common stock. The risks and uncertainties described below may not be the only ones we face. If any of the risks actually occur, our business could be materially and adversely affected. In that event, the market price of our Class A common stock could decline, and you could lose part or all of your investment. See the sections titled “Special Note Regarding Forward-Looking Statements” and “Industry and Market Data.”

Risks Related to Our Business and Our Industry

Our business depends on a strong and trusted brand, and any failure to maintain, protect, and enhance our brand would hurt our business.

We have developed a strong and trusted brand that has contributed significantly to the success of our business. Our brand is predicated on the idea that sellers and buyers will trust us and find value in building and growing their businesses with our products and services. Maintaining, protecting, and enhancing our brand is critical to expanding our base of sellers, buyers, and other third-party partners, as well as increasing engagement with our products and services. This will depend largely on our ability to maintain trust, be a technology leader, and continue to provide high-quality and secure products and services. Any negative publicity about our industry or our company, the quality and reliability of our products and services, our risk management processes, changes to our products and services, our ability to effectively manage and resolve seller and buyer complaints, our privacy and security practices, litigation, regulatory activity, and the experience of sellers and buyers with our products or services, could adversely affect our reputation and the confidence in and use of our products and services. Harm to our brand can arise from many sources, including failure by us or our partners to satisfy expectations of service and quality; inadequate protection of sensitive information; compliance failures and claims; litigation and other claims; employee misconduct; and misconduct by our partners, service providers, or other counterparties. If we do not successfully maintain a strong and trusted brand, our business could be materially and adversely affected.

Our growth may not be sustainable and depends on our ability to retain existing sellers, attract new sellers, and increase sales to both new and existing sellers.

Our total net revenue grew to $850.2 million in 2014 from $203.4 million in 2012 and to $560.6 million for the six months ended June 30, 2015, from $371.9 million for the six months ended June 30, 2014. We expect our rate of revenue growth will decline, and it may decline more quickly than we expect for a variety of reasons, including the risks described in this prospectus. We also anticipate that Starbucks will transition to another payment processor and will cease using our payment processing services prior to the scheduled expiration of our payment processing agreement with them in the third quarter of 2016. As a result, our total net revenue may decrease meaningfully in the future. Our sellers and other users of our services have no obligation to continue to use our services, and we cannot assure you that they will. We generally do not have long-term contracts with our sellers, and the difficulty and costs associated with switching to a competitor may not be significant for many of our services. Our sellers’ payment processing activity with us may decrease for a variety of reasons, including sellers’ level of satisfaction with our products and services, the effectiveness of our support services, our

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pricing, the pricing and quality of competing products or services, the effects of global economic conditions, or reductions in our sellers’ customer spending levels. In addition, the growth of our business depends in part on existing sellers expanding their use of our products and services. If we are unable to encourage sellers to broaden their use of our services, our growth may slow or stop, and our business may be materially and adversely affected. The growth of our business also depends on our ability to attract new sellers, to encourage larger sellers to use our products and services, and to introduce successful new products and services. We have invested in new products and services, including Square Cash and Caviar, and will continue to invest in new products and services, but if those products and services fail to be successful, our growth may slow or decline.

Our business has generated net losses, and we intend to continue to invest substantially in our business. Thus, we may not be able to achieve or maintain profitability.

We generated net losses of $85.2 million, $104.5 million, and $154.1 million in 2012, 2013, and 2014, respectively. As of December 31, 2014, we had an accumulated deficit of $395.6 million. For the six months ended June 30, 2015, we generated a net loss of $77.6 million. As of June 30, 2015, we had an accumulated deficit of $473.2 million. We intend to continue to make significant investments in our business, including with respect to our employee base; sales and marketing, including expenses relating to increased direct marketing efforts, referral programs, and free hardware and subsidized services; development of new products, services, and features; expansion of office space and other infrastructure; expansion of international operations; and general administration, including legal, finance, and other compliance expenses related to being a public company. If the costs associated with acquiring and supporting new or larger sellers materially rise in the future, including the fees we pay to third parties to advertise our products and services, our expenses may rise significantly. In addition, increases in our seller base could cause us to incur increased losses, because costs associated with new sellers are generally incurred up front, while revenue is recognized thereafter as sellers utilize our services. If we are unable to generate adequate revenue growth and manage our expenses, we may continue to incur significant losses and may not achieve or maintain profitability.

We frequently make decisions that may reduce our short-term operating results if we believe those decisions will improve the experiences of our sellers, their customers, and other users of our products and services, which we believe will improve our operating results over the long term. These decisions may not be consistent with the expectations of investors and may not produce the long-term benefits that we expect, in which case our business may be materially and adversely affected.

We, our sellers, our partners, and others who use our services obtain and process a large amount of sensitive data. Any real or perceived improper use of, disclosure of, or access to such data could harm our reputation as a trusted brand, as well as have a material and adverse effect on our business.

We, our sellers, and our partners, including third-party data centers that we use, obtain and process large amounts of sensitive data, including data related to our sellers, their customers, and their transactions. This is also true of other users of our services, such as Square Cash and Square Payroll. We face risks, including to our reputation as a trusted brand, in the handling and protection of this data, and these risks will increase as our business continues to expand. Our operations involve the storage and transmission of sensitive information of individuals using our services, including their names, addresses, social security numbers, payment card numbers and expiration dates, bank account information, and data regarding the performance of our sellers’ businesses. We also obtain sensitive information regarding our sellers’ customers, including their contact information, payment card numbers and expiration dates, and purchase histories. We

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have administrative, technical, and physical security measures in place, and have policies and procedures in place to contractually require third parties to whom we transfer data to implement and maintain appropriate security measures. However, if our security measures or those of the previously mentioned third parties are inadequate or are breached as a result of third-party action, employee error, malfeasance, malware, phishing, hacking attacks, system error, trickery, or otherwise, and, as a result, someone obtains unauthorized access to sensitive information, including personally identifiable information, on our systems or our partners’ systems, our reputation and business could be damaged. If the sensitive information is lost or improperly disclosed or threatened to be disclosed, we could incur significant liability and be subject to regulatory scrutiny and penalties, including costs associated with remediating the breach. Under payment card rules and our contracts with our card processors, if there is a breach of payment card information that we store or that is stored by our sellers or other third parties with which we do business, we could be liable to the payment card issuing banks for their cost of issuing new cards and other related expenses. Additionally, if our own confidential business information were improperly disclosed, our business could be materially and adversely affected. A core aspect of our business is the reliability and security of our payments platform. Any perceived or actual breach of security could have a significant impact on our reputation as a trusted brand, cause us to lose existing sellers, prevent us from obtaining new sellers, require us to expend significant funds to remedy problems caused by breaches and to implement measures to prevent further breaches, and expose us to legal risk and potential liability. Any security breach at a company providing services to us, our sellers, or other users of our services could have similar effects.

Our risk management efforts may not be effective, which could expose us to losses and liability and otherwise harm our business.

We offer payments services and other products and services to a large number of customers, and we are responsible for vetting and monitoring these customers and determining whether the transactions we process for them are legitimate. When our products and services are used to process illegitimate transactions, and we settle those funds to sellers and are unable to recover them, we suffer losses and liability. These types of illegitimate transactions can also expose us to governmental and regulatory sanctions. The highly automated nature of, and liquidity offered by, our payments services make us a target for illegal or improper uses, including fraudulent or illegal sales of goods or services, money laundering, and terrorist financing. Identity thieves and those committing fraud using stolen or fabricated credit card or bank account numbers, or other deceptive or malicious practices, potentially can steal significant amounts of money from businesses like ours. In configuring our payments services, we face an inherent trade-off between security and customer convenience. Our risk management policies, procedures, techniques, and processes may not be sufficient to identify all of the risks to which we are exposed, to enable us to mitigate the risks we have identified, or to identify additional risks to which we may become subject in the future. As a greater number of larger sellers use our services, our exposure to material risk losses from a single seller, or from a small number of sellers, will increase. For example, in the three months ended March 31, 2015, we recorded a loss of approximately $5.7 million related to fraud by a single seller using our payments services. In addition, when we introduce new services, focus on new business types, or begin to operate in markets where we have a limited history of fraud loss, we may be less able to forecast and reserve accurately for those losses. Furthermore, if our risk management policies and processes contain errors or are otherwise ineffective, we may suffer large financial losses, we may be subject to civil and criminal liability, and our business may be materially and adversely affected.

We are currently, and will continue to be, exposed to risks associated with chargebacks and refunds in connection with payment card fraud or relating to the goods or services provided by our sellers. In the event that a billing dispute between a cardholder and a seller is not resolved in favor of the seller, including in situations where the seller engaged in

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fraud, the transaction is typically “charged back” to the seller and the purchase price is credited or otherwise refunded to the cardholder. If we are unable to collect chargeback or refunds from the seller’s account, or if the seller refuses to or is unable to reimburse us for a chargeback or refunds due to closure, bankruptcy, or other reasons, we may bear the loss for the amounts paid to the cardholder. Beginning October 2015, businesses that cannot process EMV chip cards are held financially responsible for certain fraudulent transactions conducted using chip-enabled cards. This will shift an increased amount of the risk for certain fraudulent transactions from the issuing banks to these sellers, which may result in our having to seek an increased level of reimbursement for chargebacks from our sellers that do not deploy EMV compliant card readers. Our financial results would be adversely affected to the extent these sellers do not fully reimburse us for the related chargebacks. We do not collect and maintain reserves from our sellers to cover these potential losses, and for customer relations purposes we sometimes decline to seek reimbursement for certain chargebacks. The risk of chargebacks is typically greater with those of our sellers that promise future delivery of goods and services, which we allow on our service. If we are unable to maintain our losses from chargebacks at acceptable levels, the payment card networks could fine us, increase our transaction fees, or terminate our ability to process payment cards. Any increase in our transaction fees could damage our business, and if we were unable to accept payment cards, our business would be materially and adversely affected.

We derive substantially all of our revenue from payments services. Our efforts to expand our product portfolio and market reach may not succeed and may reduce our revenue growth.

We derive substantially all of our revenue from transaction fees we collect in connection with payments services. While we intend to continue to broaden the scope of products and services we offer, we may not be successful in deriving any significant revenue from these products and services. Failure to broaden the scope of products and services that are attractive may inhibit the growth of repeat business and harm our business, as well as increase the vulnerability of our core payments business to competitors offering a full suite of products and services. Furthermore, we may have limited or no experience in our newer markets. For example, we cannot assure you that any financial services and marketing services will be widely used. These offerings may present new and difficult technology, operational, and other challenges, and if we experience service disruptions, failures, or other issues, our business may be materially and adversely affected. Our newer activities may not recoup our investments in a timely manner or at all. If any of this were to occur, it could damage our reputation, limit our growth, and materially and adversely affect our business.

Our success depends on our ability to develop products and services to address the rapidly evolving market for payments and POS, financial, and marketing services, and, if we are not able to implement successful enhancements and new features for our products and services, our business could be materially and adversely affected.

We expect that new services and technologies applicable to the industries in which we operate will continue to emerge and evolve. Rapid and significant technological changes continue to confront the industries in which we operate, including developments in ecommerce, mobile commerce, and proximity payment devices (including contactless payments via NFC technology). Other potential changes are on the horizon as well, such as developments in crypto-currencies and in tokenization, which replaces sensitive data (e.g., payment card information) with symbols (tokens) to keep the data safe in the event that it ends up in the wrong hands. Similarly, there is rapid innovation in the provision of other products and services to businesses, including in financial services and marketing services.

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These new services and technologies may be superior to, impair, or render obsolete the products and services we currently offer or the technologies we currently use to provide them. Incorporating new technologies into our products and services may require substantial expenditures and take considerable time, and we may not be successful in realizing a return on these development efforts in a timely manner or at all. There can be no assurance that any new products or services we develop and offer to our sellers will achieve significant commercial acceptance. For example, in 2011, we introduced Square Wallet, a mobile payment app, and discontinued it in May 2014. Our ability to develop new products and services may be inhibited by industry-wide standards, payment card networks, laws and regulations, resistance to change from buyers or sellers, or third parties’ intellectual property rights. Our success will depend on our ability to develop new technologies and to adapt to technological changes and evolving industry standards. If we are unable to provide enhancements and new features for our products and services or to develop new products and services that achieve market acceptance or that keep pace with rapid technological developments and evolving industry standards, our business would be materially and adversely affected.

The success of enhancements, new features, and products and services depends on several factors, including the timely completion, introduction, and market acceptance of the enhancements or new features or services. We often rely not only on our own initiatives and innovations, but also on third parties, including some of our competitors, for the development of and access to new technologies. For example, we have recently introduced a chip and contactless reader combining EMV and NFC technologies, but we do not yet know whether this reader will be supported by other important industry participants or gain wide market acceptance. Failure to accurately predict or to respond effectively to developments in our industry may significantly impair our business.

In addition, because our products and services are designed to operate with a variety of systems, infrastructures, and devices, we need to continuously modify and enhance our products and services to keep pace with changes in mobile, software, communication, and database technologies. We may not be successful in either developing these modifications and enhancements or in bringing them to market in a timely and cost-effective manner. Any failure of our products and services to continue to operate effectively with third-party infrastructures and technologies could reduce the demand for our products and services, result in dissatisfaction of our sellers or their customers, and materially and adversely affect our business.

Substantial and increasingly intense competition in our industry may harm our business.

We compete in markets characterized by vigorous competition, changing technology, changing seller and buyer needs, evolving industry standards, and frequent introductions of new products and services. We expect competition to intensify in the future as existing and new competitors introduce new services or enhance existing services. We compete against many companies to attract customers, and some of these companies have greater financial resources and substantially larger bases of customers than we do, which may provide them with significant competitive advantages. These companies may devote greater resources to the development, promotion, and sale of products and services, and they may offer lower prices or more effectively introduce their own innovative products and services that adversely impact our growth. Mergers and acquisitions by these companies may lead to even larger competitors with more resources. We also expect new entrants to offer competitive products and services. Certain sellers have longstanding exclusive, or nearly exclusive, relationships with our competitors to accept payment cards and other services that we offer. These relationships may make it difficult or cost-prohibitive for us to conduct material amounts of business with them. Competing services tied to established brands may engender greater confidence in the safety and efficacy of their services. If we are unable to differentiate ourselves from and successfully compete with our competitors, our business will be materially and adversely affected.

We may also face pricing pressures from competitors. Some potential competitors are able to offer lower prices to sellers for similar services by cross-subsidizing their payments services through other services they offer. Such competition

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may result in the need for us to alter the pricing we offer to our sellers and could reduce our gross profit. In addition, as we grow, sellers may demand more customized and favorable pricing from us, and competitive pressures may require us to agree to such pricing, further reducing our gross profit. We currently negotiate pricing discounts and other incentive arrangements with certain large sellers to increase acceptance and usage of our products and services. If we continue this practice and if an increasing proportion of our sellers are large sellers, we may have to increase the discounts or incentives we provide, which could also reduce our gross profit.

We are dependent on payment card networks and acquiring processors, and any changes to their rules or practices could harm our business.

Our business depends on our ability to accept credit and debit cards, which ability is provided by the payment card networks, including Visa, MasterCard, American Express, and Discover. Other than American Express, we do not directly access the payment card networks that enable our acceptance of payment cards. As a result, we must rely on banks and acquiring processors to process transactions on our behalf. Our acquiring processor agreements have terms ranging from two to four years. Our three largest such agreements expire between the first quarter of 2017 and the first quarter of 2018, and two of these agreements provide for automatic renewal. These banks and acquiring processors may fail or refuse to process transactions adequately, may breach their agreements with us, or may refuse to renew these agreements on commercially reasonable terms. They might also take actions that degrade the functionality of our services, impose additional costs or requirements on us, or give preferential treatment to competitive services, including their own services. If we are unsuccessful in establishing or maintaining mutually beneficial relationships with these payment card networks, banks, and acquiring processors, our business may be harmed.

The payment card networks and our acquiring processors require us to comply with payment card network operating rules, including special operating rules that apply to us as a “payment service provider” providing payment processing services to merchants. The payment card networks set these network rules and have discretion to interpret them and change them. Any changes to or interpretations of the network rules that are inconsistent with the way we or our acquiring processors currently operate may require us to make changes to our business that could be costly or difficult to implement. If we fail to make such changes or otherwise resolve the issue with the payment card networks, the networks could fine us or prohibit us from processing payment cards. In addition, violations of the network rules or any failure to maintain good relationships with the payment card networks could impact our ability to receive incentives from them, could increase our costs, or could otherwise harm our business. If we were unable to accept payment cards or were limited in our ability to do so, our business would be materially and adversely affected.

We are required to pay interchange fees and assessments to the payment card networks, as well as fees to our acquiring processors, to process transactions. From time to time, payment card networks have increased, and may increase in the future, the interchange fees and assessments that they charge for each transaction processed using their networks. In addition, our acquiring processors may refuse to renew our agreements with them on commercially reasonable terms. Interchange fees or assessments are also subject to change from time to time due to government regulation. Because we generally charge our sellers a flat rate for our payments services, rather than passing through interchange fees and assessments to our sellers directly, any increase or decrease in interchange fees or assessments or in the fees we pay to our acquiring processors could make our pricing look less competitive, lead us to change our pricing model, or adversely affect our margins.

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We could be, and in the past have been, subject to penalties from payment card networks if we fail to detect that sellers are engaging in activities that are illegal, contrary to the payment card network operating rules, or considered “high risk.” We must either prevent high-risk sellers from using our products and services or register such sellers with the payment card networks and conduct additional monitoring with respect to such sellers. Although the amount of these penalties has not been material to date, any additional penalties in the future could become material and could result in termination of our ability to accept payment cards or could require changes in our process for registering new sellers. This could materially and adversely affect our business.

Our quarterly results of operations and operating metrics fluctuate significantly and are unpredictable and subject to seasonality, which could result in the trading price of our Class A common stock being unpredictable or declining.

Our quarterly results of operations may vary significantly and are not necessarily an indication of future performance. These fluctuations may be due to a variety of factors, some of which are outside of our control and may not fully reflect the underlying performance of our business. Our limited operating history combined with the rapidly evolving markets in which also contributes to these fluctuations. Fluctuations in quarterly results may materially and adversely affect the predictability of our business and the price of our Class A common stock.

Factors that may cause fluctuations in our quarterly financial results include our ability to attract and retain new customers; the timing, effectiveness, and costs of expansion and upgrades of our systems and infrastructure, as well as the success of those expansions and upgrades; the outcomes of legal proceedings and claims; our ability to maintain or increase revenue, gross margins, and operating margins; our ability to continue introducing new services and to continue convincing customers to adopt additional offerings; increases in and timing of expenses that we may incur to grow and expand our operations and to remain competitive; period-to-period volatility related to fraud and risk losses; system failures resulting in the inaccessibility of our products and services; changes in the regulatory environment, including with respect to security, privacy, or enforcement of laws and regulations by regulators, including fines, orders, or consent decrees; changes in global business or macroeconomic conditions; unusual weather conditions; general retail buying patterns; and the other risks described in this prospectus.

We depend on key management, as well as our experienced and capable employees, and any failure to attract, motivate, and retain our employees could harm our ability to maintain and grow our business.

Our future success is significantly dependent upon the continued service of our executives and other key employees. If we lose the services of any member of management or any key personnel, we may not be able to locate a suitable or qualified replacement, and we may incur additional expenses to recruit and train a replacement, which could severely disrupt our business and growth. Jack Dorsey, our co-founder, President, and Chief Executive Officer, also serves as Chief Executive Officer of Twitter. This may at times adversely affect his ability to devote time, attention, and effort to Square.

To maintain and grow our business, we will need to identify, hire, develop, motivate, and retain highly skilled employees. Identifying, recruiting, training, integrating, and retaining qualified individuals requires significant time, expense, and attention. In addition, from time to time, there may be changes in our management team that may be disruptive to our business. If our management team, including any new hires that we make, fails to work together effectively and to execute our plans and strategies on a timely basis, our business could be harmed. Competition for highly skilled personnel is

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intense, particularly in the San Francisco Bay Area where our headquarters are located. We may need to invest significant amounts of cash and equity to attract and retain new employees, and we may never realize returns on these investments. If we are not able to add and retain employees effectively, our ability to achieve our strategic objectives will be adversely affected, and our business and growth prospects will be harmed.

In addition, we have a number of employees, including many members of management, whose equity ownership in our company could give them substantial personal wealth following our initial public offering. As a result, it may be difficult for us to continue to retain and motivate these employees, and, if we are unable to do so, our business may be materially and adversely affected.

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

In order to manage our growth effectively, we must continue to strengthen our existing infrastructure, develop and improve our internal controls, create and improve our reporting systems, and timely address issues as they arise. These efforts may require substantial financial expenditures, commitments of resources, developments of our processes, and other investments and innovations. Furthermore, we encourage employees to be bold and to quickly develop and launch new features for our products and services. As we grow, we may not be able to execute as quickly as a smaller, more efficient organization. If we do not successfully manage our growth, our business will suffer.

A deterioration of general macroeconomic conditions could materially and adversely affect our business.

Our performance is subject to economic conditions and their impact on levels of spending by businesses and their customers. Most of the sellers that use our services are small businesses, many of which are in the early stages of their development, and these businesses may be disproportionately adversely affected by economic downturns and may fail at a higher rate than larger or more established businesses. If spending by their customers declines, these businesses would experience reduced sales and process fewer payments with us or, if they cease to operate, stop using our products and services altogether. Small businesses frequently have limited budgets and limited access to capital, and they may choose to allocate their spending to items other than our financial or marketing services, especially in times of economic uncertainty or in recessions. In addition, if more of our sellers cease to operate, this may have an adverse impact not only on the growth of our payments services but also on the success of our other services. For example, the growth in the number of sellers qualifying for Square Capital may slow or the receivables related to the Square Capital merchant cash advances may be paid more slowly, or not at all. Thus, if general macroeconomic conditions deteriorate, our business could be materially and adversely affected.

If we are unable to maintain, promote, and grow our brand through effective marketing and communications strategies, our brand and business may be harmed.

We believe that maintaining and promoting our brand in a cost-effective manner is critical to achieving widespread acceptance of our products and services and to expanding our base of customers. Maintaining and promoting our brand will depend largely on our ability to continue to provide useful, reliable, and innovative products and services, which we may not do successfully. We may introduce, or make changes to, features, products, services, or terms of service that customers do not like, which may materially and adversely affect our brand. Our brand promotion activities may not generate customer awareness or increase revenue, and even if they do, any increase in revenue may not offset the

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expenses we incur in building our brand. If we fail to successfully promote and maintain our brand or if we incur excessive expenses in this effort, our business could be materially and adversely affected.

The introduction and promotion of new services, as well as the promotion of existing services, may be partly dependent on our visibility on third-party advertising platforms, such as Google, Twitter, or Facebook. Changes in the way these platforms operate or changes in their advertising prices or other terms could make the maintenance and promotion of our products and services and our brand more expensive or more difficult. If we are unable to market and promote our brand on third-party platforms effectively, our ability to acquire new sellers would be materially harmed.

We have received a significant amount of media coverage since our formation. We have also been from time to time in the past, and may in the future be, the target of incomplete, inaccurate, and misleading or false statements about our company, our business, and our products and services that could damage our brand and materially deter people from adopting our services. Negative publicity about our company or our management, including about our product quality and reliability, changes to our products and services, privacy and security practices, litigation, regulatory enforcement, and other actions, as well as the actions of our customers and other users of our services, even if inaccurate, could cause a loss of confidence in us. Our ability to respond to negative statements about us may be limited by legal prohibitions on permissible public communications by us during our initial public offering process or during future periods.

We face challenges in expanding into new geographic regions.

We plan to continue expanding into new geographic regions, and we currently face and will continue to face risks entering markets in which we have limited or no experience and in which we may not be well-known. Offering our services in new geographic regions often requires substantial expenditures and takes considerable time, and we may not be successful enough in these new geographies to recoup our investments in a timely manner or at all. We may be unable to attract a sufficient number of sellers, fail to anticipate competitive conditions, or face difficulties in operating effectively in these new markets.

The expansion of our products and services globally exposes us to risks relating to staffing and managing cross-border operations; increased costs and difficulty protecting intellectual property and sensitive data; tariffs and other trade barriers; differing and potentially adverse tax consequences; increased and conflicting regulatory compliance requirements, including with respect to data privacy and security; lack of acceptance of our products and services; challenges caused by distance, language, and cultural differences; exchange rate risk; and political instability. Accordingly, our efforts to expand our global operations may not be successful, which could limit our ability to grow our business.

We rely on third parties and their systems for a variety of services, including to process transaction data and settle funds to us and our sellers, and these third parties’ failure to perform these services adequately could materially and adversely affect our business.

To provide our payments solution and other products and services, we rely on third parties that we do not control, such as the payment card networks, our acquiring processors, the payment card issuers, various financial institution partners, systems like the Federal Reserve Automated Clearing House, and other partners. We rely on these third parties for a variety of services, including to transmit transaction data, process chargebacks and refunds, settle funds to our sellers, and to provide information and other elements of our services. For example, we currently rely on three acquiring

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processors in the United States and one in each of Canada and Japan. While we believe there are other acquiring processors that could meet our needs, adding or transitioning to new providers may disrupt our business and increase our costs. In the event these third parties fail to provide these services adequately, including as a result of errors in their systems or events beyond their control, or refuse to provide these services on terms acceptable to us or at all, and we are not able to find suitable alternatives, our business may be materially and adversely affected.

Our services must integrate with a variety of operating systems, and the hardware that enables merchants to accept payment cards must interoperate with third-party mobile devices utilizing those operating systems. If we are unable to ensure that our services or hardware interoperate with such operating systems and devices, our business may be materially and adversely affected.

We are dependent on the ability of our products and services to integrate with a variety of operating systems, as well as web browsers that we do not control. Any changes in these systems that degrade the functionality of our products and services, impose additional costs or requirements on us, or give preferential treatment to competitive services, including their own services, could materially and adversely affect usage of our products and services. In addition, we rely on app marketplaces, such as the Apple App Store and Google Play, to drive downloads of our mobile app. Apple, Google, or other operators of app marketplaces regularly make changes to their marketplaces, and those changes may make access to our products and services more difficult. In the event that it is difficult for our sellers to access and use our products and services, our business may be materially and adversely affected.

In addition, our hardware interoperates with mobile devices developed by third parties. For example, the current version of Square Reader plugs into the audio jack of most smartphones and tablets. Changes in the design of these mobile devices may limit the interoperability of our hardware with such devices and require modifications to our hardware. If we are unable to ensure that our hardware continues to interoperate effectively with such devices, or if doing so is costly, our business may be materially and adversely affected.

Many of our key components are procured from a single or limited number of suppliers. Thus, we are at risk of shortage, price increases, changes, delay, or discontinuation of key components, which could disrupt and materially and adversely affect our business.

Many of the key components used to manufacture our products, such as the custom parts of Square Reader for magnetic stripe cards, including its magnetic stripe-reading element, its plastic cover, and its application-specific integrated circuits, come from limited or single sources of supply, as do the plastic cover, connector, and security cage of Square Reader for EMV chip cards and NFC. In addition, in some cases, we rely only on one manufacturer to fabricate, test, and assemble our products. For example, a single manufacturer assembles Square Reader for magnetic stripe cards and Square Reader for EMV chip cards and NFC, as well as manufactures those products’ plastic parts with custom tools that we own but that they maintain on their premises. The term of the agreement with that manufacturer initially expired on June 26, 2014, but automatically renewed (and will continue to renew) for consecutive one-year periods unless either party provides notice of non-renewal. In general, our contract manufacturers fabricate or procure components on our behalf, subject to certain approved procedures or supplier lists, and we do not have firm commitments from all of these manufacturers to provide all components, or to provide them in quantities and on timelines that we may require. To date, we have not identified alternative manufacturers for the assembly of our products and for most of the single-sourced components used in our products. For example, pursuant to a development and supply agreement, a component supplier

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provides design, development, customization, and related services for components of the magnetic stripe-reading element in some of our products. The term of the agreement will continue until September 30, 2016, at which point it will automatically renew for successive two-year terms unless either party provides notice of non-renewal. Similarly, a component provider develops certain application-specific integrated circuits for our products pursuant to our designs and specifications. The term of our agreement with this provider will continue until March 24, 2016, and will automatically renew for consecutive one-year periods unless either party provides notice of non-renewal. Due to our reliance on the components or products produced by suppliers such as these, we are subject to the risk of shortages and long lead times in the supply of certain components or products. In the case of off-the-shelf components, we are subject to the risk that our suppliers may discontinue or modify them or that the components may cease to be available on commercially reasonable terms. We have in the past experienced, and may in the future experience, component shortages or delays or other problems in product assembly, and the availability of these components or products may be difficult to predict. Additionally, various sources of supply-chain risk, including strikes or shutdowns at delivery ports or loss of or damage to our products while they are in transit or storage, could limit the supply of our products. In the event of a shortage or supply interruption from suppliers of these components, we may not be able to develop alternate sources quickly, cost-effectively, or at all. Any interruption or delay in component supply, any increases in component costs, or the inability to obtain these parts or components from alternate sources at acceptable prices and within a reasonable amount of time, would harm our ability to provide our products to sellers on a timely basis. This could harm our relationships with our sellers, prevent us from acquiring new sellers, and materially and adversely affect our business.

Our business could be harmed if we are unable to accurately forecast demand for our products and to adequately manage our product inventory.

We invest broadly in our business, and such investments are driven by our expectations of the future success of a product. Our products, such as Square Reader, often require investments with a long lead times. An inability to correctly forecast the success of a particular product could harm our business. We must forecast inventory needs and expenses and place orders sufficiently in advance with our third-party suppliers and contract manufacturers based on our estimates of future demand for particular products. Our ability to accurately forecast demand for our products could be affected by many factors, including an increase or decrease in demand for our products or for our competitors’ products, unanticipated changes in general market conditions, and the change in economic conditions.

If we underestimate demand for a particular product, our contract manufacturers and suppliers may not be able to deliver sufficient quantities of that product to meet our requirements, and we may experience a shortage of that product available for sale or distribution. The shortage of a popular product could materially and adversely affect our brand, our seller relationships, and the acquisition of additional sellers. If we overestimate demand for a particular product, we may experience excess inventory levels for that product and the excess inventory may become obsolete or out-of-date. Inventory levels in excess of demand may result in inventory write-downs or write-offs and the sale of excess inventory at further discounted prices, which could negatively impact our gross profit and our business.

Our products and services may not function as intended due to errors in our software, hardware, and systems, or due to security breaches or human error in administering these systems, which could materially and adversely affect our business.

Our software, hardware, and systems may contain undetected errors that could have a material adverse effect on our business, particularly to the extent such errors are not detected and remedied quickly. We have from time to time found

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defects in our customer-facing software and hardware, internal systems, and technical integrations with third-party systems, and new errors may be introduced in the future. In addition, we provide frequent incremental releases of product and service updates and functional enhancements, which increases the possibility of errors. The electronic payments products and services we provide are designed to process complex transactions and deliver reports and other information related to those transactions, all at high volumes and processing speeds. Since customers use our services for important aspects of their businesses, any errors, defects, disruptions in services, or other performance problems with our services could hurt our reputation and damage our customers’ businesses. Software and system errors, or human error, could delay or inhibit settlement of payments, result in oversettlement, cause reporting errors, or prevent us from collecting transaction fees, all of which have occurred in the past. Similarly, security breaches or errors in our hardware design or manufacture could cause product safety issues typical of consumer electronics devices. Such issues could lead to product recalls and inventory shortages, result in costly and time-consuming efforts to redesign and redistribute our products, give rise to regulatory inquiries and investigations, and result in lawsuits and other liabilities and losses, which could have a material and adverse effect on our business.

Systems failures, interruptions, delays in service, catastrophic events, and resulting interruptions in the availability of our products or services could harm our business and our brand, and subject us to substantial liability.

Our systems and those of our third-party data center facilities may experience service interruptions, denial-of-service and other cyber-attacks, human error, earthquakes, hurricanes, floods, fires, natural disasters, power losses, disruptions in telecommunications services, fraud, military or political conflicts, terrorist attacks and other geopolitical unrest, computer viruses, or other events. Our systems are also subject to break-ins, sabotage, and acts of vandalism. Some of our systems are not fully redundant, and our disaster-recovery planning is not sufficient for all eventualities. In addition, as a provider of payments solutions, we are subject to increased scrutiny by regulators that may require specific business continuity and disaster recovery plans and more rigorous testing of such plans. This increased scrutiny may be costly and time-consuming and may divert our resources from other business priorities.

We have experienced and will likely continue to experience denial-of-service attacks, system failures, and other events or conditions that interrupt the availability or reduce the speed or functionality of our products and services. These events have resulted and likely will result in loss of revenue. In addition, they could result in significant expense to repair or replace damaged equipment and remedy resultant data loss or corruption. A prolonged interruption in the availability or reduction in the speed or other functionality of our products or services could materially harm our reputation and business. Frequent or persistent interruptions in our products and services could cause sellers to believe that our products and services are unreliable, leading them to switch to our competitors or to avoid our products and services, and could permanently harm our reputation and business. Moreover, to the extent that any system failure or similar event results in damages to customers or their businesses, these customers could seek compensation from us for their losses, and those claims, even if unsuccessful, would likely be time-consuming and costly for us to address.

A significant natural disaster could have a material and adverse impact on our business. Our headquarters and certain of our data center facilities are located in the San Francisco Bay Area, a region known for seismic activity. Despite any precautions we may take, the occurrence of a natural disaster or other unanticipated problems at our headquarters or data centers could result in lengthy interruptions in our services or could result in related liabilities. We have implemented a disaster recovery program, which enables us to move production to a back-up data center in the event of a catastrophe.

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Although this program is functional, it may prove to be inadequate, increasing the risk of interruptions in our services, which could have a material and adverse impact on our business. We do not maintain insurance sufficient to compensate us for the potentially significant losses that could result from disruptions to our services.

Our Square Capital service is subject to additional risks relating to the availability of capital, seller receivables, and general macroeconomic conditions.

Our Square Capital service is subject to risks in addition to those described elsewhere in this prospectus. Maintaining and growing our Square Capital service is dependent on third parties to purchase the future receivables related to the Square Capital merchant cash advances. If third parties fail to continue to purchase such receivables or reduce the amount of future receivables they purchase, then we would have to fund future advances to merchants from our own resources and might have to reduce the scale of our Square Capital service. If third parties reduce the price they are willing to pay for these receivables or reduce the servicing fees they pay us in exchange for servicing the receivables on their behalf, then the financial performance of Square Capital would be harmed.

Adverse changes in macroeconomic conditions could cause some Square Capital sellers to cease operating or to experience a decline in their payment processing volume, rendering us unable to obtain the receivables or extending the period of time required for us to obtain such receivables. Sellers receiving MCAs are contractually obligated to use Square as their only card payment processing service until we have received the agreed-upon fixed amount of receivables. To the extent a seller breaches this obligation, the seller would be liable to us for the balance of the receivables. Consistent with the general nature of MCAs, we do not otherwise have any economic recourse to the seller in the event that it does not process a sufficient volume of payments with us to pay the agreed-upon fixed amount of receivables.

In addition, adverse changes in macroeconomic conditions could also lead to a decrease in the number of sellers suitable for Square Capital advances and strain our ability to correctly identify such sellers or manage risk of non-payment or fraud. Similarly, if we fail to correctly predict or price the availability of receivables of sellers utilizing our Square Capital service, our business may be materially and adversely affected.

We intend to continue to explore other models and structures for our Square Capital service, including lending and other forms of credit. Some of those models or structures would require, or be deemed to require, additional procedures, partnerships, licenses, or capabilities that we have not yet obtained or developed. Should we fail to expand and evolve our Square Capital service in this manner, or should these new models or structures, or new regulations or interpretations of existing regulations, impose requirements on us that are impractical or that we cannot satisfy, the future growth and success of the Square Capital service may be materially and adversely affected.

Our business is subject to extensive regulation and oversight in a variety of areas, all of which are subject to change and uncertain interpretation .

We are subject to a wide variety of local, state, federal, and international laws and regulations in the United States and in other countries in which we operate. These laws and regulations govern numerous areas that are important to our business, including consumer protection, privacy, labor and employment, immigration, import and export practices, product labeling, competition, and marketing and communications practices, to name a few. Such laws and regulations are subject to evolving interpretations and application, and it can be difficult to predict how they may be applied to our business,

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particularly as we introduce new products and services and expand into new jurisdictions. Any perceived or actual breach of laws and regulations could negatively impact our business. It is possible that these laws and regulations could be interpreted or applied in a manner that would prohibit, alter, or impair our existing or planned products and services; that could cause us to be subject to audits, inquiries, or investigations; that could result in fines, injunctive relief, or other penalties; or that could require costly, time-consuming, or otherwise burdensome compliance measures from us.

In particular, as we seek to build a trusted and secure platform for commerce, and as we expand our network of sellers and buyers and facilitate their transactions and interactions with one another, we will increasingly be subject to laws and regulations relating to the collection, use, retention, security, and transfer of information, including the personally identifiable information of our employees and sellers and their customers. As with the other laws and regulations noted above, these laws and regulations may be interpreted and applied differently over time and from jurisdiction to jurisdiction, and it is possible they will be interpreted and applied in ways that will materially and adversely affect our business. We post on our website our privacy policies and practices concerning the collection, use, and disclosure of information. Any failure, real or perceived, by us to comply with our posted privacy policies or with any regulatory requirements or orders or other local, state, federal, or international privacy or consumer protection-related laws and regulations could cause sellers or their customers to reduce their use of our products and services and could materially and adversely affect our business.

Our business is subject to complex and evolving regulations and oversight related to our provision of payments services and other financial services.

The laws, rules, and regulations that govern our business include or may in the future include those relating to banking, deposit-taking, cross-border and domestic money transmission, foreign exchange, payments services (such as payment processing and settlement services), consumer financial protection, anti-money laundering, escheatment, and compliance with the Payment Card Industry Data Security Standard, a set of requirements designed to ensure that all companies that process, store, or transmit payment card information maintain a secure environment to protect cardholder data. These laws, rules, and regulations are enforced by multiple authorities and governing bodies in the United States, including the Department of the Treasury, the Consumer Financial Protection Bureau, the Federal Deposit Insurance Corporation, and numerous state and local agencies. Outside of the United States, we are subject to additional laws, rules, and regulations related to the provision of payments and financial services, including those enforced by the Ministry of Economy, Trade, and Industry in Japan and those enforced by the Financial Transactions and Reports Analysis Centre in Canada, and as we expand into new jurisdictions, the number of foreign regulations and regulators governing our business will expand as well.

Although we have a compliance program focused on applicable laws, rules, and regulations and are continually investing more in this program, we may still be subject to fines or other penalties in one or more jurisdictions levied by federal or state or local regulators, including state Attorneys General, as well as those levied by foreign regulators. In addition to fines, penalties for failing to comply with applicable rules and regulations could include significant criminal and civil lawsuits, forfeiture of significant assets, or other enforcement actions. We could also be required to make changes to our business practices or compliance programs as a result of regulatory scrutiny. In addition, any perceived or actual breach of compliance by us with respect to applicable laws, rules, and regulations could have a significant impact on our reputation as a trusted brand and could cause us to lose existing customers, prevent us from obtaining new customers, require us to expend significant funds to remedy problems caused by breaches and to avert further breaches, and expose us to legal risk and potential liability.

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We have obtained licenses to operate as a money transmitter (or its equivalent) in the United States and in the states where this is required. As a licensed money transmitter, we are subject to obligations and restrictions with respect to the investment of customer funds, reporting requirements, bonding requirements, and inspection by state regulatory agencies concerning those aspects of our business considered money transmission. Evaluation of our compliance efforts, as well as the questions of whether and to what extent our products and services are considered money transmission, are matters of regulatory interpretation and could change over time. In the past, we have been required to pay fines to Florida regulatory authorities and have received a Cease and Desist Order from Illinois regulatory authorities due to their interpretations and applications to our business of their respective state money transmission laws. In the future, as a result of the regulations applicable to our business, we could be subject to additional liability, including governmental fines, restrictions on our business, or other sanctions, and we could be forced to cease conducting certain aspects of our business with residents of certain jurisdictions, be forced to otherwise change our business practices in certain jurisdictions, or be required to obtain additional licenses or regulatory approvals. There can be no assurance that we will be able to obtain any such licenses, and, even if we were able to do so, there could be substantial costs and potential product changes involved in maintaining such licenses, which could have a material and adverse effect on our business.

We are subject to risks related to litigation, including intellectual property claims and regulatory disputes.

We may be, and in some instances have been, subject to claims, lawsuits (including class actions and individual lawsuits), government investigations, and other proceedings involving intellectual property, consumer protection, privacy, labor and employment, immigration, import and export practices, product labeling, competition, accessibility, securities, tax, marketing and communications practices, commercial disputes, and other matters. For example, we have been served with a putative class action complaint filed on behalf of couriers for our Caviar subsidiary alleging that the couriers have been improperly denied reimbursement for business expenses due to their classification as independent contractors.

We are currently in litigation with Robert E. Morley and a related entity regarding the inventorship of certain patents related to our intellectual property (Morley Litigation). If one or more claims in the Morley Litigation were determined adversely to us, or if the Morley Litigation were settled on unfavorable terms, this could affect our ability to use certain intellectual property and could also result in substantial monetary liabilities. In addition, Mr. Morley filed a subsequent lawsuit containing allegations that the formation of Square and the development of our card reader and decoding technologies constituted, among other things, breach of an alleged oral joint venture, fraud, negligent misrepresentation, civil conspiracy, unjust enrichment, and misappropriation of trade secrets, as well as other related claims. Mr. Morley contends that he was an equal partner with Jack Dorsey and Jim McKelvey in the business enterprise that ultimately evolved into Square, and that Mr. Dorsey and Mr. McKelvey breached their alleged oral joint venture agreement with Mr. Morley by excluding him from ownership in Square. Mr. Morley is seeking a judgment and order that Square, Mr. Dorsey, and Mr. McKelvey hold ownership of Square in constructive trust for Mr. Morley, as well as a variety of damages, injunctive relief, royalties, and correction of inventorship of certain of our patents.

The number and significance of our legal disputes and inquiries have increased as we have grown larger, as our business has expanded in scope and geographic reach, and as our products and services have increased in complexity. Becoming a public company will raise our public profile, which may result in increased litigation. In addition, some of the laws and regulations affecting the internet, mobile commerce, payment processing, business financing, and employment did not anticipate businesses like ours, and many of the laws and regulations affecting us have been enacted relatively recently. As a result, there is substantial uncertainty regarding the scope and application of many of the laws and

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regulations to which we are subject, which increases the risk that we will be subject to claims alleging violations of those laws and regulations. In the future, we may also be accused of having, or be found to have, infringed or violated third-party intellectual property rights.

Regardless of the outcome, legal proceedings can have a material and adverse impact on us due to their costs, diversion of our resources, and other factors. Plaintiffs may seek, and we may become subject to, preliminary or provisional rulings in the course of litigation, including preliminary injunctions requiring us to cease some or all of our operations. We may decide to settle legal disputes on terms that are unfavorable to us. Furthermore, if any litigation to which we are a party is resolved adversely, we may be subject to an unfavorable judgment that we may not choose to appeal or that may not be reversed upon appeal. We may have to seek a license to continue practices found to be in violation of a third party’s rights. If we are required, or choose to enter into, royalty or licensing arrangements, such arrangements may not be available on reasonable terms or at all and may significantly increase our operating costs and expenses. As a result, we may also be required to develop or procure alternative non-infringing technology or discontinue use of technology, and doing so could require significant effort and expense or may not be feasible. In addition, the terms of any settlement or judgment in connection with any legal claims, lawsuits, or proceedings may require us to cease some or all of our operations or pay substantial amounts to the other party and could materially and adversely affect our business.

Our intellectual property rights are valuable, and any inability to protect them could reduce the value of our products, services, and brand.

Our trade secrets, trademarks, copyrights, patents, and other intellectual property rights are critical to our success. We rely on, and expect to continue to rely on, a combination of confidentiality, invention assignment, and license agreements with our employees, consultants, and third parties with whom we have relationships, as well as trademark, trade dress, domain name, copyright, trade secret, and patent rights, to protect our brand and other intellectual property rights. However, various events outside of our control may pose a threat to our intellectual property rights, as well as to our products and services. Effective protection of trademarks, copyrights, domain names, patent rights, and other intellectual property rights is expensive and difficult to maintain, both in terms of application and maintenance costs, as well as the costs of defending and enforcing those rights. The efforts we have taken to protect our intellectual property rights may not be sufficient or effective. Our intellectual property rights may be infringed, misappropriated, or challenged, which could result in them being narrowed in scope or declared invalid or unenforceable. Similarly, our reliance on unpatented proprietary information and technology, such as trade secrets and confidential information, depends in part on agreements we have in place with employees and third parties that place restrictions on the use and disclosure of this intellectual property. These agreements may be insufficient or may be breached, or we may not enter into sufficient agreements with such individuals in the first instance, in either case potentially resulting in the unauthorized use or disclosure of our trade secrets and other intellectual property, including to our competitors, which could cause us to lose any competitive advantage resulting from this intellectual property. Individuals not subject to invention assignment agreements may make adverse ownership claims to our current and future intellectual property. For example, we are currently in litigation with Robert E. Morley and a related entity regarding the inventorship of certain patents and patent applications related to our intellectual property. There can be no assurance that our intellectual property rights will be sufficient to protect against others offering products or services that are substantially similar to ours and that compete with our business.

As of June 30, 2015, we had 95 patents issued in the United States and abroad and 433 patent applications on file in the United States and abroad, though there can be no assurance that any or all of these applications will ultimately be

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issued as patents. We also pursue registration of copyrights, trademarks, and domain names in the United States and in certain jurisdictions outside of the United States, but doing so may not always be successful or cost-effective. In general, we may be unable or, in some instances, choose not to obtain legal protection for our intellectual property, and our existing and future intellectual property rights may not provide us with competitive advantages or distinguish our products and services from those of our competitors. The laws of some foreign countries do not protect our intellectual property rights to the same extent as the laws of the United States, and effective intellectual property protection and mechanisms may not be available in those jurisdictions. We may need to expend additional resources to defend our intellectual property in these countries, and the inability to do so could impair our business or adversely affect our international expansion. Our intellectual property rights may be contested, circumvented, or found unenforceable or invalid, and we may not be able to prevent third parties from infringing, diluting, or otherwise violating them.

Significant impairments of our intellectual property rights, and limitations on our ability to assert our intellectual property rights against others, could have a material and adverse effect on our business.

We may not be able to secure financing on favorable terms, or at all, to meet our future capital needs.

We have funded our operations since inception primarily through equity financings, bank credit facilities, and capital lease arrangements. We do not know when or if our operations will generate sufficient cash to fund our ongoing operations. In the future, we may require additional capital to respond to business opportunities, refinancing needs, challenges, acquisitions, or unforeseen circumstances and may decide to engage in equity or debt financings or enter into credit facilities for other reasons, and we may not be able to secure any such additional debt or equity financing or refinancing on favorable terms, in a timely manner, or at all. Any debt financing obtained by us in the future could also 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. Our credit facility contains operating covenants, including customary limitations on the incurrence of certain indebtedness and liens, restrictions on certain inter-company transactions, and limitations on the amount of dividends and stock repurchases. Our ability to comply with these covenants may be affected by events beyond our control, and breaches of these covenants could result in a default under the credit facility and any future financial agreements into which we may enter. If not waived, defaults could cause our outstanding indebtedness under our credit facility and any future financing agreements that we may enter into to become immediately due and payable.

If we raise additional funds through further issuances of equity, convertible debt securities, or other securities convertible into equity, our existing stockholders could suffer significant dilution in their percentage ownership of our company, and any new equity securities we issue could have rights, preferences, and privileges senior to those of holders of our Class A common stock. If we are unable to obtain adequate financing or financing on terms satisfactory to us when we require it, our ability to continue to grow or support our business and to respond to business challenges could be significantly limited.

Acquisitions, strategic investments, entries into new businesses, and divestitures could disrupt our business, divert our management’s attention, result in additional dilution to our stockholders, and harm our business.

We may in the future seek to acquire or invest in businesses, apps, or technologies that we believe could complement or expand our products and services, enhance our technical capabilities, or otherwise offer growth opportunities. The

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identification, evaluation, and negotiation of potential acquisitions or potential divestitures may divert the attention of management and entail various expenses, whether or not such transactions are ultimately completed. In addition, we have limited experience in acquiring other businesses. If we acquire additional businesses, we may not be able to integrate the acquired personnel, operations, and technologies successfully, or effectively manage the combined business following the acquisition. We also may not achieve the anticipated benefits from the acquired businesses due to a number of factors, including difficulties resulting from the integration of technologies, IT systems, accounting systems, culture or personnel; diversion of management’s attention; litigation; use of resources; or other disruption of our operations. Regulatory constraints, particularly competition regulations, may also affect the extent to which we can maximize the value of our acquisitions or investments. Acquisitions could also result in dilutive issuances of equity securities or the incurrence of debt. In addition, we may spend time and money on acquisitions or investments that do not increase our revenue. If an acquired business fails to meet our expectations, our business may be materially and adversely affected.

Our reported financial results may be materially and adversely affected by changes in accounting principles generally accepted in the United States.

Generally accepted accounting principles in the United States are subject to interpretation by the Financial Accounting Standards Board (FASB), the Securities and Exchange Commission (SEC), and various bodies formed to promulgate and interpret appropriate accounting principles. A change in these principles or interpretations could have a significant effect on our reported financial results and could materially and adversely affect the transactions completed before the announcement of a change.

We may have exposure to greater-than-anticipated tax liabilities, which may materially and adversely affect our business.

We are subject to income taxes and non-income taxes in the United States and other countries in which we conduct business, and such laws and rates vary by jurisdiction. We are subject to review and audit by U.S. federal, state, local and foreign tax authorities. Such tax authorities may disagree with tax positions we take and if any such tax authority were to successfully challenge any such position, our financial results and operations could be materially and adversely affected. In addition, our future tax liability could be adversely affected by changes in tax laws, rates, and regulations. The determination of our worldwide provision for income and other taxes is highly complex and requires significant judgment, and there are many transactions and calculations where the ultimate tax determination is uncertain. Although we believe our estimates are reasonable, the amount ultimately payable may differ from amounts recorded in our financial statements and may materially affect our financial results in the period or periods for which such determination is made.

Risks Related to Ownership of Our Class A Common Stock and this Offering

The dual class structure of our common stock has the effect of concentrating voting control within our existing stockholders, including our employees and directors and their affiliates; this will limit or preclude your ability to influence corporate matters.

Our Class B common stock has ten votes per share, and our Class A common stock, which is the stock we are offering in our initial public offering, has one vote per share. Stockholders who hold shares of Class B common stock, including our executive officers, employees, and directors and their affiliates, will together hold approximately     % of the

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voting power of our outstanding capital stock following our initial public offering. Because of the ten-to-one voting ratio between our Class B and Class A common stock, the holders of our Class B common stock collectively will hold more than a majority of the combined voting power of our common stock upon the completion of our initial public offering, and therefore such holders will be able to control all matters submitted to our stockholders for approval. When the shares of our Class B common stock represent less than 5% of combined voting power of our Class A common stock and Class B common stock, the then-outstanding shares of Class B common stock will automatically convert into shares of Class A common stock. These holders of our Class B common stock may have interests that differ from yours and may vote in a way with which you disagree and which may be adverse to your interests.

Transfers by holders of Class B common stock will generally result in those shares converting to Class A common stock, subject to limited exceptions, such as certain transfers effected for estate planning purposes. Shares sold by the selling stockholder in this offering will become Class A common stock upon such sale. Such conversions of Class B common stock to Class A common stock upon transfer will have the effect, over time, of increasing the relative voting power of those holders of Class B common stock who retain their shares in the long term. If, for example, our existing shareholders retain a significant portion of their holdings of Class B common stock for an extended period of time, they could, in the future, continue to control a majority of the combined voting power of our outstanding capital stock. For a description of the dual class structure, see “Description of Capital Stock.”

We will incur significantly increased costs and devote substantial management time as a result of operating as a public company.

As a public company, we will incur significant legal, finance, and other expenses that we did not incur as a private company. We will be subject to the reporting requirements of the Securities Exchange Act of 1934, as amended (the Exchange Act), and will be required to comply with the applicable requirements of the Sarbanes-Oxley Act and the Dodd-Frank Wall Street Reform and Consumer Protection Act, as well as the rules and regulations subsequently implemented by the SEC and the listing standards of the New York Stock Exchange (the NYSE), including changes in corporate governance practices and the establishment and maintenance of effective disclosure and financial controls. Following this offering, we will be required to furnish a report by management on, among other things, the effectiveness of our internal control over financial reporting for the first fiscal year beginning after the effective date of this offering. This assessment will need to include disclosure of any material weaknesses identified by our management in our internal control over financial reporting, as well as a statement that our auditors have issued an attestation report on our management’s assessment of our internal controls. We expect that complying with these requirements will increase our legal and financial compliance costs and will make some activities more time consuming and costly. In addition, we expect that our management and other personnel will need to divert attention from operational and other business matters to devote substantial time to these requirements. In particular, we expect to incur significant expenses and devote substantial management effort toward ensuring compliance with the requirements of Section 404 of the Sarbanes-Oxley Act, which will increase when we are no longer an emerging growth company, as defined by the JOBS Act. We will need to hire additional accounting and financial staff with appropriate public company experience and technical accounting knowledge and maintain an internal audit function. Moreover, we could incur additional compensation costs in the event that we decide to pay cash compensation closer to that of other public technology companies, which would increase our general and administrative expenses and could materially and adversely affect our profitability.

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If we are unable to implement and maintain effective internal controls over financial reporting in the future, investors may lose confidence in the accuracy and completeness of our financial reports, and the market price of our Class A common stock may be materially and adversely affected.

We are currently evaluating our internal controls, identifying and remediating deficiencies in those internal controls, and documenting the results of our evaluation, testing, and remediation. We may not be able to complete our evaluation, testing, and any required remediation in a timely fashion. If we identify one or more material weaknesses in our internal control over financial reporting that we are unable to remediate before the end of the same fiscal year in which the material weakness is identified, or if we are otherwise unable to maintain effective internal controls over financial reporting, we will be unable to assert that our internal controls are effective. If we are unable to do so, or if our auditors are unable to attest to management’s report on the effectiveness of our internal controls, we could lose investor confidence in the accuracy and completeness of our financial reports, which could cause the price of our Class A common stock to decline. For example, we identified a significant deficiency in our internal control over financial reporting during the preparation of our financial statements for the year ended December 31, 2014, which related to a discrepancy in the reconciliation of a sub-ledger. A significant deficiency is a control deficiency, or combination of control deficiencies, in internal control over financial reporting that is less severe than a material weakness yet important enough to merit attention by those responsible for oversight of a company’s financial reporting. We have taken steps to remediate our control deficiencies. However, our efforts to remediate them may not be effective or prevent any future deficiency in our internal control over financial reporting. We will be required to disclose material changes made in our internal controls and procedures on a quarterly basis. However, our independent registered public accounting firm will not be required to formally attest to the effectiveness of our internal control over financial reporting pursuant to Section 404 of the Sarbanes-Oxley Act until the later of the year following our first annual report required to be filed with the SEC or the date we are no longer an “emerging growth company” as defined in the JOBS Act.

An active trading market for our Class A common stock may never develop or be sustained.

We intend to apply for the listing of our Class A common stock on the NYSE under the symbol “SQ.” However, we cannot assure you that an active trading market for our Class A common stock will develop on that exchange or elsewhere or, if developed, that any market will be sustained. Accordingly, we cannot assure you that a liquid trading market will exist, that you will be able to sell your shares of our Class A common stock when you wish, or that you will obtain your desired price for your shares of our Class A common stock.

The market price of our Class A common stock may be volatile, and you could lose all or part of your investment.

Prior to the completion of this offering, there has been no public market for shares of our Class A common stock. The initial public offering price of our Class A common stock will be determined through negotiation between us, the selling stockholder, and the underwriters. This price will not necessarily reflect the price at which investors in the market will be willing to buy and sell shares of our Class A common stock following this offering. In addition, the market price of our Class A common stock following this offering is likely to be highly volatile, may be higher or lower than the initial public offering price of our Class A common stock and could be subject to wide fluctuations in response to various factors, some of which are beyond our control and may not be related to our operating performance.

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Fluctuations in the market price of our Class A common stock could cause you to lose all or part of your investment because you may not be able to sell your shares at or above the price you paid in this offering. Factors that could cause fluctuations in the market price of our Class A common stock include the following:

In addition, in the past, following periods of volatility in the overall market and the market price of a particular company’s securities, securities class action litigation has often been instituted against these companies. This litigation, if instituted against us, could result in substantial costs and a diversion of our management’s attention and resources.

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A total of             , or     %, of the outstanding shares of our capital stock after this offering will be restricted from immediate resale but may be sold in the near future. The large number of shares of our capital stock eligible for public sale or subject to rights requiring us to register them for public sale could depress the market price of our Class A common stock.

The market price of our Class A common stock could decline as a result of sales of a large number of shares of our Class A common stock in the market after this offering, and the perception that these sales could occur may also depress the market price of our Class A common stock. Based on shares of our capital stock outstanding as of                     , 2015, we will have             shares of our capital stock outstanding after this offering. Our executive officers, directors, and the holders of substantially all of our capital stock, options, and warrants have entered into lock-up agreements with the underwriters under which they have agreed, subject to specific exceptions, not to sell any of our capital stock for 180 days following the date of this prospectus. As a result of these agreements, the provisions of our investors’ rights agreement described further in the section titled “Description of Capital Stock—Registration Rights” and the provisions of Rule 144 or Rule 701 under the Securities Act, shares of our capital stock will be available for sale in the public market as follows:

We or the underwriters may release certain stockholders from the lock-up agreements or market standoff agreements prior to the end of the 180-day period.

Following the expiration of the lock-up agreements referred to above, stockholders owning an aggregate of up to             shares of our Class B common stock can require us to register shares of our capital stock owned by them for public sale in the United States. In addition, we intend to file a registration statement to register approximately             shares of our capital stock reserved for future issuance under our equity compensation plans. Upon effectiveness of that registration statement, subject to the satisfaction of applicable exercise periods, the expiration or waiver of the market standoff agreements and lock-up agreements referred to above, and applicable volume restrictions and other restrictions that apply to affiliates, the shares of our capital stock issued upon exercise of outstanding options to purchase shares of our Class A common stock will be available for immediate resale in the United States in the open market.

Future sales of our Class A common stock may make it more difficult for us to sell equity securities in the future at a time and at a price that we deem appropriate. These sales also could cause the market price of our common stock to decline and make it more difficult for you to sell shares of our Class A common stock.

Anti-takeover provisions contained in our amended and restated certificate of incorporation, our amended and restated bylaws, and provisions of Delaware law, could impair a takeover attempt.

Our amended and restated certificate of incorporation, our amended and restated bylaws, and Delaware law contain provisions which could have the effect of rendering more difficult, delaying, or preventing an acquisition deemed undesirable by our board of directors and therefore depress the trading price of our Class A common stock.

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Among other things, our amended and restated certificate of incorporation and amended and restated bylaws include provisions (i) creating a classified board of directors whose members serve staggered three-year terms; (ii) authorizing “blank check” preferred stock, which could be issued by our board of directors without stockholder approval and may contain voting, liquidation, dividend, and other rights superior to our common stock; (iii) limiting the ability of our stockholders to call special meetings; (iv) eliminating the ability of our stockholders to act by written consent without a meeting or to remove directors without cause; and (v) requiring advance notice of stockholder proposals for business to be conducted at meetings of our stockholders and for nominations of candidates for election to our board of directors. These provisions, alone or together, could delay or prevent hostile takeovers and changes in control or changes in our management.

As a Delaware corporation, we are also subject to provisions of Delaware law, including Section 203 of the Delaware General Corporation Law, which prevents certain stockholders holding more than 15% of our outstanding capital stock from engaging in certain business combinations without the approval of our board of directors or the holders of at least two-thirds of our outstanding capital stock not held by such stockholder.

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

Our amended and restated bylaws will provide that the Court of Chancery of the State of Delaware will be the sole and exclusive forum for substantially all disputes between us and our stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers, or employees.

Our amended and restated bylaws, which will become effective prior to the completion of this offering, provide that, unless we consent to the selection of an alternative forum, the Court of Chancery of the State of Delaware is the sole and exclusive forum for (i) any derivative action or proceeding brought on our behalf; (ii) any action asserting a claim of breach of fiduciary duty owed by any of our directors, officers, or other employees to us or to our stockholders; (iii) any action asserting a claim arising pursuant to the Delaware General Corporation Law; or (iv) any action asserting a claim governed by the internal affairs doctrine. The choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our directors, officers, or other employees, which may discourage such lawsuits against us and our directors, officers, and other employees. Alternatively, if a court were to find the choice of forum provision contained in our amended and restated bylaws to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could have a material and adverse impact on our business.

Our management will have broad discretion over the use of proceeds and may apply the proceeds of this offering in ways that may not improve our business or increase the value of your investments.

We intend to use the net proceeds to us from this offering for general corporate purposes, including working capital, operating expenses, and capital expenditures. We cannot specify with certainty the particular uses of the net proceeds to us from this offering. Accordingly, our management will have considerable discretion in the application of the net proceeds,

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and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. Until the net proceeds are used, they may be placed in investments that do not produce significant income or that may lose value.

Purchasers in this offering will experience immediate and substantial dilution in the book value of their investment.

The assumed initial public offering price of $         per share, which is the midpoint of the estimated offering price range set forth on the cover page of this prospectus, is substantially higher than the pro forma net tangible book value per share of our outstanding capital stock upon the completion of this offering. Therefore, if you purchase shares of our Class A common stock in this offering, you will incur immediate dilution of $         in the net tangible book value per share from the price you paid. In addition, investors purchasing shares of our Class A common stock from us in this offering will have contributed     % of the total consideration paid to us by all stockholders who purchased shares of our Class A common stock, in exchange for acquiring approximately     % of the outstanding shares of our Class A common stock as of                     , 2015, after giving effect to this offering. The exercise of outstanding options to purchase shares of our Class A common stock will result in further dilution.

In making your investment decision, you should understand that we and the underwriters have not authorized any other party to provide you with information concerning us or this offering.

You should carefully evaluate all of the information in this prospectus. We have in the past received, and may continue to receive, a high degree of media coverage, including coverage that is not directly attributable to statements made by our officers or employees, that incorrectly reports on statements made by our officers or employees, or that is misleading. We and the underwriters have not authorized any other party to provide you with information concerning us or this offering.

If securities or industry analysts do not publish or cease publishing research or reports about us, our business, our market, or our competitors, or if they adversely change their recommendations regarding our Class A common stock, the market price of our Class A common stock and trading volume could decline.

The market for our Class A common stock will be influenced by the research and reports that securities or industry analysts may publish about us, our business, our market, or our competitors. If any of the analysts who may cover us adversely change their recommendations regarding our Class A common stock, or provide more favorable recommendations regarding our competitors, the market price of our common stock may decline. If any of the analysts who may cover us were to cease coverage of our company or fail to regularly publish reports on us, we may lose visibility in the financial markets, which in turn could cause the market price of our Class A common stock and trading volume to decline.

We do not expect to declare any dividends in the foreseeable future.

We do not anticipate declaring any cash dividends to holders of our common stock in the foreseeable future. Consequently, investors may need to rely on sales of our common stock after price appreciation, which may never occur, as the only way to realize any future gains on their investment. Investors seeking cash dividends should not purchase shares of our common stock.

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Additional stock issuances could result in significant dilution to our stockholders.

We may issue additional equity securities to raise capital, make acquisitions, or for a variety of other purposes. Additional issuances of our stock may be made pursuant to the exercise or conversion of new or existing convertible debt securities, warrants, stock options, or other equity incentive awards to new and existing service providers. Any such issuances will result in dilution to existing holders of our stock. We rely on equity-based compensation as an important tool in recruiting and retaining employees. The amount of dilution due to equity-based compensation of our employees and other additional issuances could be substantial.

As an emerging growth company within the meaning of the Securities Act, we will utilize certain modified disclosure requirements, and we cannot be certain whether these reduced requirements will make our Class A common stock less attractive to investors.

We are an emerging growth company, and for as long as we continue to be an emerging growth company, we may choose to take advantage of exemptions from various reporting requirements applicable to other public companies but not to “emerging growth companies.” These exemptions include reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, an exemption from the requirement that our independent registered public accounting firm audit our internal control over financial reporting under Section 404 of the Sarbanes-Oxley Act, and exemptions from the requirements to hold a nonbinding advisory vote on executive compensation and to provide stockholders the opportunity to vote on any golden parachute payments not previously approved. We have in this prospectus utilized, and we plan in future filings with the SEC to continue to utilize, the modified disclosure requirements available to emerging growth companies. As a result, our stockholders may not have access to certain information they may deem important.

Under the JOBS Act, we will remain an “emerging growth company” until the earliest of (i) the last day of the first fiscal year in which our total annual revenue reaches or exceeds $1.0 billion; (ii) the date that we become a “large accelerated filer” as defined in the Exchange Act, which could occur as early as January 1, 2017; (iii) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the preceding three-year period; or (iv) the last day of the first fiscal year following the fifth anniversary of the completion of this offering.

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