Visa is the largest payment processor in the world. In fiscal 2018, it processed $8.2 trillion in purchase transactions. Visa operates in over 200 countries and processes transactions in over 160 currencies. Its systems are capable of processing over 65,000 transactions per second.

Mastercard is the second- largest payment processor in the world and processed $4.3 trillion in purchase transactions in 2018. Mastercard operates in over 200 countries and processes transactions in over 150 currencies.

PayPal was spun off from eBay in 2015 and provides electronic payment solutions to merchants and consumers, with a focus on online transactions. The company had 267 million active accounts at the end of 2018, including 22 million merchant accounts. The company also owns Xoom, an international money transfer business, and Venmo, a person-to-person payment platform.

American Express is a global financial institution, operating in about 130 countries, that provides consumers and businesses charge and credit card payment products. The company operates a highly profitable merchant payment network. Since 2018, the company has operated in three segments: global consumer services, global commercial services, and global merchant and network services. In addition to payment products, the company's commercial business offers expense management tools, consulting services, and business loans.

Fidelity National Information Services is the product of two significant mergers, Sungard in 2014 and the upcoming $43.6 billion acquisition of Worldpay. The company will now provide core and payment processing services to banks, as well as merchant acquiring. In addition, Fidelity provides processing software for capital markets providers, asset managers, and custodians. As of 2019, the company serves more than 20,000 institutions in over 130 countries. North America accounts for 76% of revenue; Europe, the Middle East, and Africa another 15%; while Asia accounts for 5% of total sales.

Fiserv is a leading provider of core processing and complementary services, such as electronic funds transfer, payment processing, and loan processing, for U.S. banks and credit unions. It serves 13,000 clients, with a focus on its legacy business with small and midsize banks.

Capital One is a diversified financial services holding company offering a broad spectrum of financial products and services to consumers, small businesses, and commercial customers through a variety of delivery channels. Capital One serves commercial and consumer banking customers through branches in New York, New Jersey, Texas, Louisiana, and Virginia.

Discover Financial Services is a bank operating in two distinct segments: direct banking and payments. The company issues credit and debit cards and provides other consumer banking products including deposit accounts, students loans, and other personal loans. In addition, it generates revenue from payments processed on the Discover network. The Discover Network is the third- largest payment network as ranked by overall merchant acceptance, trailing Visa and Mastercard.

Global Payments is a leading provider of payment processing and software solutions and focuses on serving small and midsize merchants. The company operates in 30 countries and generates about one fourth of its revenue from outside North America, primarily in Europe and Asia. Global Payments recently announced its intention to merge with Total System Services in an all-stock deal that will give Total System Services shareholders 48% of the combined company's shares.

Fleetcor Technologies Inc is a provider of specialised payment products. The company offers fleet cards, food cards, corporate lodging discount cards, and other specialised payment services. Fleetcor's systems enable its customers to manage and control their commercial payments and loyalty-card programmes. Customers include commercial fleet operators, major oil companies, petroleum marketers, and government entities. Further, Fleetcor offers customised analysis solutions to its clients, offering business productivity tracking capabilities. North America is the largest geographic operating segment.