A123 Systems (AONE) -16.7% after filing an 8-K in which it claims its history of losses and cash burn "raise substantial doubt on the Company's ability to continue as a going concern." It's added management is trying to raise cash and is "evaluating other strategic alternatives," and is "in discussions with strategic partners for substantial investments." A123 had $113M in cash and equivalents as of March 31, down from $187M three months earlier.
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