SAFE HARBOR STATEMENT This letter contains forward-looking statements within the meaning of the Safe Harbor provisions of the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical fact could be deemed forward-looking, including, but not limited to, statements regarding the strategies, areas of focus, and future performance of Square, Inc. and its consolidated subsidiaries (the Company); the Company’s expected financial results for future periods; future growth in the Company’s businesses and products; the expected closing and impact of the Company’s recent proposed acquisitions, including our expectations regarding our ability to integrate such acquisitions and their impact on our growth and financial results; the Company’s expectations regarding scale, profitability, and the demand for or benefits from its products, product features, and services in the U.S. and in international markets; and management’s statements related to business strategy, plans, and objectives for future operations. In some cases, forward-looking statements can be identified by terms such as “may,” “will,” “appears,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential,” or “continue,” or the negative of these words or other similar terms or expressions that concern our expectations, strategy, plans, or intentions. Such statements are subject to a number of known and unknown risks, uncertainties, assumptions, and other factors that may cause the Company’s actual results, performance, or achievements to differ materially from results expressed or implied in this letter. Investors are cautioned not to place undue reliance on these statements. Actual results could differ materially from those expressed or implied, and reported results should not be considered as an indication of future performance. Risks that contribute to the uncertain nature of the forward-looking statements include, among others, the Company’s ability to deal with the substantial and increasingly intense competition in its industry; changes to the rules and practices of payment card networks and acquiring processors; the Company’s ability to consummate, and the impact of, any potential acquisitions or divestitures, strategic investments, or entries into new businesses; the effect of evolving regulations and oversight related to the Company’s provision of payments services and other financial services; the effect of management changes and business initiatives; and changes in political, business, and economic conditions; as well as other risks listed or described from time to time in the Company’s filings with the Securities and Exchange Commission (the SEC), including the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017, which is on file with the SEC and available on the investor relations page of the Company’s website. Additional information will also be set forth in the Company’s Quarterly Report on Form 10-Q for the fiscal quarter ended March 31, 2018. All forward-looking statements are based on information and estimates available to the Company at the time of this letter and are not guarantees of future performance. Except as required by law, the Company assumes no obligation to update any of the statements in this letter. KEY OPERATING METRICS AND NON-GAAP FINANCIAL MEASURES To supplement our financial information presented in accordance with generally accepted accounting principles in the United States (GAAP), we consider certain operating and financial measures that are not prepared in accordance with GAAP, including Gross Payment Volume, Adjusted Revenue, Adjusted EBITDA, Adjusted EBITDA margin, Adjusted Net Income (Loss), Adjusted EPS, and non-GAAP operating expenses. We believe these metrics and measures are useful to facilitate period-to-period comparisons of our business and to facilitate comparisons of our performance to that of other payments solution providers. We define Gross Payment Volume (GPV) as the total dollar amount of all card payments processed by sellers using Square, net of refunds. Additionally, GPV includes Cash App activity related to peer-to-peer payments sent from a credit card, and Cash for Business. Adjusted Revenue is a non-GAAP financial measure that we define as our total net revenue less transaction-based costs and bitcoin costs. We believe it is useful to subtract transaction-based costs and bitcoin costs from total net revenue to derive Adjusted Revenue as this is a primary metric used by management to measure our business performance, and it affords greater comparability to other payments solution providers. Substantially all of the transaction-based costs are interchange and assessment fees, processing fees, and bank settlement fees paid to third-party payment processors and financial institutions. While some payments solution providers present their revenue in a similar fashion to us, others present their revenue net of transaction-based costs because, unlike us, they pass through these costs directly to their sellers and are not deemed the principal in these arrangements. Under our standard pricing model, we do not pass through these costs directly to our sellers. We also deduct bitcoin costs because we consider our role in the bitcoin transactions to be facilitating customer access to bitcoin. Since we only apply a small margin to the market cost of bitcoin when we sell bitcoin to customers, and we have no control over the cost of bitcoin in the market, which tends to be volatile, we believe deducting bitcoin costs is a better reflection of the economic benefits as well as the Company’s performance from the bitcoin transactions. Adjusted Revenue has limitations as a financial measure, should be considered as supplemental in nature, and is not meant as a substitute for the related financial information prepared in accordance with GAAP. Adjusted EBITDA, Adjusted Net Income (Loss), Adjusted EPS, and non-GAAP operating expenses are non-GAAP financial measures that represent our net loss and net loss per share, adjusted to eliminate the effect of share-based compensation expenses, amortization of intangible assets, amortization of debt discount and issuance costs in connection with our offering of convertible senior notes in the first quarter of 2017, the gain or loss on the sale of property and equipment, and impairment of intangible assets, as applicable. In addition to the items above, Adjusted EBITDA and non-GAAP operating expenses are non- GAAP financial measures that also exclude depreciation, other cash interest income and expense, other income and expense, and provision or benefit from income taxes, as applicable. Basic Adjusted Net Income (Loss) Per Share is computed by dividing the Adjusted Net Income (Loss) by the weighted-average number of shares of common stock outstanding during the period. Diluted Adjusted Net Income Per Share is computed by dividing Adjusted Net Income by the weighted-average number of shares of common stock outstanding, adjusted for the dilutive effect of all potential shares of common stock. 13