The owners of the 59 largest portfolios of merchant payment card acceptance contracts in the US are ranked here based on purchases of goods and services in 2025. For the complete ranking, including all charts and tables, log in and download Issue 1304. The majority of purchase transactions were initiated by global brand and domestic-only credit, debit and prepaid cards. The global brands are American Express, Discover, Diners Club, JCB, Mastercard, Visa and UnionPay. There are more than a dozen US domestic-on...