tumbled 21.1 percent to $6.13 in premarket trade after the smartphone maker said it was abandoning a plan to sell itself and instead, would replace its chief executive officer. The benchmark S&P index has risen 4.2 percent over the past four weeks as the partial U.S. government shutdown in October pushed back expectations for the Federal Reserve to begin curtailing its stimulus measures into the first quarter of 2014. "In some ways you could say 'mission accomplished' for the Fed," said Peter Jankovskis, co-chief investment officer at OakBrook Investments LLC in Lisle, Illinois.



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