Oil-and-gas takes the pole among premarket gainers following Petrohawk's (HK +63%) $12.1B bid from BHP Billiton (BHP -1.6%) as it moves deeper into the U.S. shale. The deal values HK at 50% higher than 30-day prices. LNG +6.2%. CHK +5.6%. FST +4.7%. SD +4.2%. XCO +3.8%. EOG +3.7%. HES +2.3%.