Stocks are closing solidly higher after energy companies soared along with the price of crude oil, the AP reports. Energy stocks had their biggest one-day gain since January Wednesday after the price of crude jumped 5% on reports that OPEC nations had agreed to production cuts. Nine of the 10 biggest gainers in the Standard & Poor's 500 index were energy companies, led by an 11% surge in Murphy Oil. Mattress maker Tempur Sealy plunged 22% after delivering a weak forecast. The Dow Jones industrial average rose 110 points, or 0.6%, to 18,339. The S&P 500 gained 11 points, or 0.5%, to 2,171. The Nasdaq composite increased 12 points, or 0.2%, to 5,318. (More Dow Jones stories.)