Key TakeawaysBank stocks were among the market's worst performers on Tuesday as a deluge of business updates stole the spotlight from the unveiling of a major concession by federal regulators. Shares of JPMorgan Chase, Goldman Sachs, and Ally Financial all tumbled after executives from each raised concerns about their respective bank's income statement and balance sheet.The Federal Reserve on Tuesday outlined a watered-down version of the capital requirements rules that banks pushed back on when they were f ...