| NEW YORK (MarketWatch) -- Energy stocks posted mild gains in early action on Friday. The NYSE Arca Oil Index (XOI 1,048, -1.17, -0.11%) rose 0.2% to 1,051. The NYSE Arca Natural Gas Index (XNG 499.65, -0.22, -0.04%) rose 0.1% to 500. The Philadelphia Oil Service Index (OSX 185.90, +0.25, +0.14%) rose 0.3% to 186. |