Both stocks slipped in after-hours trading Monday after the energy companies were out with quarterly earnings.
Chesapeake shares fell more than 3% late Monday as the company said it swung to a quarterly loss.
Energy-sector ETFs have rallied in 2011 on higher oil prices. Energy Select Sector SPDR Fund (NYSEArca: XLE) has jumped nearly 20% year to date.
The iShares Dow Jones U.S. Oil & Gas Exploration & Production Index Fund (NYSEArca: IEO) has 7.3% and 4.3% in Anadarko and Chesapeake, respectively.
Energy Select Sector SPDR Fund (NYSEArca: XLE)