Chesapeake Energy ( CHK) Of any oil and gas company, Chesapeake Energy's had the most eventful time dealing with the crisis. The company, who's taken stakes in an array of gas exploration partnerships, has seen its shares plummet and then rocket back during the crisis as its unloaded billions in asset sales. Overall, Chesapeake Energy's cut 13 sales to raise nearly $14 billion of much needed cash to survive volatile earnings that have swayed between a $5 billion-plus loss in 2009 and a near $2 billion profit in 2010. Meanwhile, the company's only made just one minor purchase, an April 2011 buy of Bronco Drilling for $311 million. Earnings sways as a result of volatile gas selling prices, a huge overhang of debt, a shortage of cash and a sprawl of energy assets, the U.S. second largest gas producer has, caused Chesapeake shares dip into single digits at some points in the crisis. To shore up its balance sheet, Chesapeake has relied on foreign buyers. The company sold its Fayetteville shale assets to Australia's BHP ( BHP) for $4.75 billion, Barnett shale assets to France's Total ( TOT) for $2.25 billion, Marcellus shale assets to Norway's Statoil ( STO) form $1.25 billion and Eagle Ford shale assets to China's CNOOC ( CEO) for another $1.08 billion among others. The hard work in shale sales has paid off for Chesapeake in the short term however. Its shares have risen over 14% from this time last year, while the Dow Jones Industrial Average and the S&P 500 Index have risen nearly 5%.