The Dow Jones industrial average surged more than 300 points on Thursday, building on gains from a day earlier after the Federal Reserve indicated that it was in no rush to raise interest rates as the economy strengthened.
Oracle led a rally in technology shares after the business software maker reported earnings that were better than expected.
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Energy stocks lagged the market as the price of crude oil turned lower, erasing an early gain.
The Dow was up 303 points, or 1.8 percent, to 17,657 as of 1:38 p.m. Eastern.
The Standard & Poor's 500 gained 35 points, or 1.8 percent, to 2,048.
The Nasdaq climbed 87 points, or 1.9 percent, to 4,732.
Bond prices fell. The yield on the 10-year Treasury note rose to 2.21 percent.