Devon Energy Corp. (NYSE: DVN) is a leading independent energy company engaged in finding and producing oil and natural gas. Based in Oklahoma City and included in the S&P 500, Devon operates in several of the most prolific oil and natural gas plays in the U.S. and Canada and is the second-largest oil producer among North American onshore independents. Devon's Canadian operations are based in Calgary, Alberta and the company is one of Canada's top heavy oil producers with operations in the Athabasca region of northeastern Alberta.