Oil and gas stocks fell on Thursday as crude oil prices moved closer $92 a barrel.
The Amex Oil Index rose 6.91 points to 1,507.80.
Hess Corp stock fell 3.04 percent at $89.31.
East coast refiner Sunoco Inc was up 0.23, or 0.33 percent at $69.91.
The Philadelphia Oil Service was up 3.40, or 1.18 percent to 291.32.
The Amex Natural Gas index increased 6.95, or 1.24 percent to 569.56 after an Energy Department report that U.S. natural gas inventories fell 121 billion cubic feet last week.
Dallas-based refiner Holly Corp. announced on Wednesday that it plans to buy back $200 million worth of its stock, coming on top of the $14 million still left to buy from its previous buy-back plan.
Holly Corp shares rose 1.03, or 2.01 percent to $52.30.