US stocks sank, capping the market’s biggest three-day tumble since March, as financial shares slumped on President Barack Obama’s plan to rein in banks and results at Google disappointed investors.

Bank of America led the S&P 500 Financials Index to a 3.3 percent drop as uncertainty over Ben S. Bernanke’s confirmation for another term as head of the Federal Reserve also weighed on lenders. The Standard & Poor’s 500 index lost 2.2 percent to 1,091.76, plunging the most since October and erasing its 2010 gain. The gauge slid 5.1 percent over the past three days as China curbed lending and Obama said banks should be banned from proprietary trading.

The Dow Jones industrial average sank 216.9 points, or 2.1 percent, to 10,172.98. The Nasadq fell 2.67 percent, or 60.41 points, to 2,205.29.

Morgan Stanley lost 5.3 percent to $27.80, Bank of America fell 3.7 percent to $14.90 and Goldman Sachs declined 4.2 percent to $154.12.