There are only four banks headquartered in the U.S. with more than $1 trillion in assets.There are more than 4,500 bank subsidiaries in the U.S., according to the Federal Deposit Insurance Corporation. However, there is a wide discrepancy in size. Four banks -- JPMorgan Chase, Bank of America, Citigroup, and Wells Fargo -- each have at least $1.6 trillion in assets, while the fifth largest bank has only $664 billion in assets. The next 10 banks after Citi total about $4.3 trillion in assets, compared to Cha ...