Total return: 68%
Fortune 500 rank: 208
The diversified energy company has benefited from the rising demand for cleaner burning natural gas. Analysts also seem to like the restructuring undergone by the company, which acts as a natural gas utility in Oklahoma, Kansas and Texas, as well as a collector and distributor of natural gas and natural gas liquids nationwide.The company has posted impressive returns, helped by a recent string of acquisitions. Profits rose 44 percent in 2006 and helped drive an increase in the stock price. But some analysts fear the buying spree has reduced transparency at the company, and burdened its balance sheet.
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