Shares of Seadrill (NYSE: SDRL) rocketed in May, ending the month up 78%. Fueling the offshore driller's rebound were fading investor fears after the company received approval for its plan to exit bankruptcy in April. In mid-April, a U.S. judge approved Seadrill's plan to exit Chapter 11 bankruptcy. That deal will extend the maturities of $5 billion in bank loans and convert $2.3 billion of bond debt into equity.