Shares of shale-oil producers continued to get pounded in premarket trade Monday, as crude oil prices extend their slide to multiyear lows. Among the hardest-hit stocks ahead of the open, Clayton Williams Energy's tumbled 11%, on the heels a 26% plunge on Friday. Goodrich Petroleum's stock slumped 6.6%, putting it on track to open at the lowest price since January 2004. Oasis Petroleum's stock slid 7.5%, even though it was upgraded to positive from neutral at Susquehanna, which said the recent price weakness -- the stock tumbled 27% on Friday and 62% over the past three months -- has made it more attractive. Continuous crude oil futures were recently down 0.8% to $65.59 a barrel, and hit a 5 1/2-year low of $63.72 in overnight trade. Elsewhere in the energy sector, the stocks of Exxon Mobil and Chevron were both down 0.6% early Monday.
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