While most oil stocks have fallen sharply this month, the least affected by the slump share one thing in common: they don't plan to slow down, even though a glut of supply is forcing prices down. Cimarex Energy Co. jumped more than 8 percent in two days after executives said Aug. 5 that their rig count would more than double next year. Pioneer Natural Resources Co. rallied for three days when it disclosed a similar increase.

Shareholders continue to favor growth over returns, helping explain why companies that form the engine of U.S. oil -- the frackers behind the boom -- aren't slowing down enough to rebalance the market. U.S. production has remained high, frustrating OPEC's strategy of maintaining market share and enlarging a glut that has pushed oil below $40 a barrel. West Texas Intermediate crude was trading at $39.20 a barrel, down 11 cents, at 10:01 a.m. New York time Wednesday.

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