CapitalOne. What's In Your Wallet ? Capital One Financial Corp. is a McLean, Virginia-based bank holding company specializing in credit cards, home loans, auto loans, banking, and savings products. A member of the fortune 500, the company helped pioneer the mass marketing of credit cards in the early 1990s, and it is now the fourth largest customer of the United States Postal Service. Capital One responded to the 2007 subprime mortgage financial crisis by jettisoning its mortgage platform, GreenPoint Mortgage, due in part to investor pressures.