5. Alpha Natural Resources (ANR - Get Report) shares jumped 50.1% last month, but is down 55.8% this year. The company is a producer of high-quality thermal and metallurgical coal, and recent acquisitions have made it one of the biggest coal producers in North America.
4. Valero Industries (VLO - Get Report) jumped 50.2% last month and 16% so far in 2011. The company operates 13 refineries, making it the top independent refiner in the U.S.