Friday's midday trade: Wall Street gains

Wall Street rose on Friday, led by energy and materials stocks as commodity prices firmed in light trading before the long Memorial Day holiday weekend. The S&P Energy index rose 0.8 percent. Occidental Petroleum added 1.8 percent to $106.87. Freeport-McMoRan Copper & Gold Inc rose 2.3 percent to $51.55. The Dow Jones industrial average was up 70.61 points, or 0.57 percent, at 12,473.37.
The Standard & Poor's 500 Index was up 7.19 points, or 0.54 percent, at 1,332.88. The Nasdaq Composite Index was up 16.34 points, or 0.59 percent, at 2,799.26.