First Republic Bank rescue plan spearheaded by Jamie Dimon.

JPMorgan CEO Jamie Dimon is leading talks with other big banks to stabilize First Republic Bank, which is facing mounting investor pressure after a $30 billion deposit from 11 of the nation's biggest banks. Options being considered include direct investment, sale, or outside capital injection. First Republic's shares plummeted about 47% during trading on Monday, leading losses among regional banks, and S&P cut the bank's credit rating three notches to B+. Federal regulators have praised the move by the banks to rescue First Republic amid fears of a broader financial crisis.