6. Diamond Offshore Drilling (DO) shares have plunged 33% this year. The company was hurt by the ban on offshore drilling in the wake of the BP (BP) oil spill in the Gulf of Mexico. Its third-quarter profit tumbled 45% to $199 million, or $1.43 a share, as revenue dropped 12% to $800 million. Its operating margin narrowed from 53% to 36%. The company's management expects a prolonged slowdown in the Gulf region, but has relocated most of its rigs to international locations.
10 Worst-Performing S&P 500 Stocks of 2010
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