9. Chesapeake Energy ( CHK), the second-largest producer of natural gas in the U.S., is focused on discovering and developing conventional and unconventional natural gas and oil fields onshore in the U.S. Chesapeake has major stakes in the Barnett, Fayetteville, Haynesville, Marcellus and Bossier natural gas shale wells and other unconventional liquid plays. Revenue for the second quarter of 2011 was $1.79 billion, vs. $1.16 billion in the same quarter a year ago. Net income was $467 million compared with $235 million in the year-ago quarter. By the end of the second quarter, Chesapeake developed the largest combined inventories of onshore leasehold (14.48 million net acres). Net production from the property is 320 million cubic feet equivalent (MMCFE) a day with an operating rig count of 30. According to Bloomberg, 54% of analysts covering the stock give it a buy rating. Shares have appreciated nearly 20% over the past year, and the stock is trading with a P/E of 10.8 based on estimated 2011 earnings. The average one-year price target of analysts covering the stock is 28% greater than current levels.