Banking regulators are warning that the number of banks at risk of failure has reached a fifteen-year high. The Federal Deposit Insurance Corporation said the number of “problem banks” had risen from 305 to 416 during the second quarter. The FDIC has already shut down eighty-one banks this year. This comes at a time when the nation’s largest banks are getting even bigger due to a series of federally arranged mergers and taxpayer bailouts. JPMorgan Chase, Bank of America, Wells Fargo and Citigroup now issue one of every two mortgages and about two of every three credit cards. JPMorgan Chase, Bank of America and Wells Fargo now each hold more than ten percent of the nation’s deposits, despite a rule barring such a practice.