Owners of the 66 largest portfolios of merchant card acceptance contracts in the U.S. for acquiring payments from American Express, Discover, Diners Club, JCB, Mastercard, Visa, and UnionPay credit, debit, and prepaid global brand cards are ranked on pages 10 and 11. Also shown are the domestic-only debit card payments they handled such as Interlink, Star, Nyce, Pulse, and Accel. The five largest U.S. owners based on purchase transactions processed—Worldpay, First Data, Chase Merchant Services, Bank of America Merchant Services, and Global Payments—remained in the same positions they held ...