The S&P 500 index dropped 106.84 points, or 2.3%, marking its worst day since February
Banks see few places to put their big profits other than back into the hands of their shareholders
The banks can resume paying out dividends to investors and buying back stock
Industry culture prizes in-person meetings to carve out deals
The appointments suggest CEO Jamie Dimon could choose a woman to lead the company after he retires
Both banks released billions from their loan-loss reserves
Trading helped drive results
The U.S. bank's wealth management revenues were up 24% from a year earlier
The bank’s balance sheet is heavily weighted toward short-term interest rates
Earnings significantly exceeded analyst expectations