U.S. seen involved with Wells for some time

The bank said on Thursday it would need $13.7 billion of capital, in light of results from the U.S. government stress test, and on Thursday the bank said it plans to sell $6 billion of common stock.

The stress test findings give more fuel to short sellers who for months have argued that there are dangerous risks lurking on Wells Fargo's balance sheet.

And even though investors like Warren Buffett who have demonstrated great faith in Wells Fargo's earnings power, government entanglement may weigh on the bank's performance in the near term, analysts said.