Paper, plastic, or digital -- in whatever form, First Data moves the money. One of the world's largest electronic payments processors, First Data serves roughly 6 million merchants and some 4,000 card issuers in some 35 countries. It provides a variety of secure funds transfer and related services including credit card payment processing, fraud protection and authentication, check guarantee (through subsidiary TeleCheck), electronic bill payment management, and point-of-sale (POS) services. First Data also owns a stake in joint venture Bank of America Merchant Services. The company went public in late 2015.