stockholders has agreed to use a portion of the proceeds received by such selling stockholder or its applicable affiliate in our acquisition of Global BlueThe selling stockholders may sell these shares through public or private transactions at market prices prevailing at the time of sale, at pricesrelated to such market prices, at varying prices determined at the time of sale, at fixed prices or at negotiated prices. The timing and amount of any saleis within the sole discretion of the applicable selling stockholder, subject to certain restrictions. The registration of the securities covered by this We will not receive any of the proceeds from the shares of ClassA common stock sold by the selling stockholders, but we have agreed to paycertain registration expenses.Our ClassA common stock is listed on the New York Stock Exchange (the “NYSE”) under the symbol “FOUR.” On July11, 2025, the last Investing in our ClassA common stock involves risks. You should read this prospectus supplement, theaccompanying prospectus and the documents we file with the Securities and Exchange Commission (the “SEC”) thatare incorporated by reference herein carefully before you make an investment decision. See “Risk Factors” beginningon pageS-2of this prospectus supplement, as well as the documents we file with the SEC that are incorporated by supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense. The date of this prospectus supplement is July14, 2025 MARKET AND INDUSTRY DATAWHERE YOU CAN FIND MORE INFORMATION ProspectusABOUT THIS PROSPECTUSWHERE YOU CAN FIND MORE INFORMATION; INCORPORATION BY REFERENCETHE COMPANYRISK FACTORSUSE OF PROCEEDSDESCRIPTION OF CAPITAL STOCKDESCRIPTION OF DEBT SECURITIESDESCRIPTION OF OTHER SECURITIESGLOBAL SECURITIESSELLING SECURITYHOLDERSPLAN OF DISTRIBUTIONLEGAL MATTERSS-i This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of this offering. The second part isthe accompanying base prospectus, which describes more general information about securities we and any selling securityholders may offer from time totime, some of which does not apply to this offering of ClassA common stock. Generally, when we refer to the prospectus, we are referring to both partsof this document combined. If information in this prospectus supplement or any related free writing prospectus differs from information in theaccompanying prospectus, you should rely on the information in this prospectus supplement or the related free writing prospectus.The distribution of this prospectus supplement and the accompanying prospectus and the offering of the ClassA common stock in certainjurisdictions may be restricted by law. Persons who come into possession of this prospectus supplement, any related free writing prospectus and theaccompanying prospectus should inform themselves about and observe any such restrictions. This prospectus supplement, any related free writingprospectus and the accompanying prospectus do not constitute, and may not be used in connection with, an offer or solicitation by anyone in anyjurisdiction in which such offer or solicitation is not authorized or in which the person making such offer or solicitation is not qualified to do so or to anyperson to whom it is unlawful to make such offer or solicitation.You should not consider any information in this prospectus supplement, any related free writing prospectus or the accompanying prospectus to beinvestment, legal or tax advice. You should consult your own counsel, accountant and other advisors for legal, tax, business, financial and related adviceregarding the purchase of the ClassA common stock. We are not making any representation to you regarding the legality of an investment in the ClassAcommon stock by you under applicable investment or similar laws.You should read and consider all information contained or incorporated by reference in this prospectus supplement, any related free writingprospectus and the accompanying prospectus that we provide or make available to you before making your investment decision.We and the selling stockholders have not authorized anyone to provide you with information different from that contained or incorporated by that the information contained or incorporated by reference in this prospectus supplement, any free writing prospectus or the accompanying prospectusis accurate as of any date other than the date on the front of that document. S-ii The information in this prospectus supplement and the documents incorporated by reference herein should be read in conjunction with theconsolidated financial statements and notes thereto included in our Annual Report on Form10-Kfor the fiscal year ended December31, 2024 (our“Annual Report”), our Quarterly Report on Form10-Qfor the fiscal quarter ended March31, 2025 (our “Quarterly Report”), and our Current Report onForm8-Kdated April30, 2025 which are incor