JP Morgan Leads Bank Shares Lower After $2 Billion Loss Disclosure

-- Bank shares drop ahead of U.S. market open on J.P. Morgan loss disclosure

-- JPM leads banks lower, falling 8.3%, while others are down by about 2%-4%

-- Most analysts still stand behind bank

NEW YORK (Dow Jones)--Stocks of the major U.S. banking companies fell sharply in premarket U.S. trading Friday, led lower by J.P. Morgan Chase & Co. after the bank revealed a $2 billion trading loss in a previously little-known corner of the bank's vast operations.

J.P. Morgan shares were down about 8% ahead ...