AMSC, a Devens company that makes products for wind turbines and energy grids, reported a second-quarter loss of $15.9 million, or $0.31 per share, compared with net loss was $51.7 million, or $1.02 per share. AMSC said its second-quarter 2012 results included a $3.3 million non-cash “mark-to-market” benefit driven by the re-valuation of the derivative liability and warrants associated with the company’s debt financings. Second-quarter revenues of $20.9 million were roughly flat with those of the same quarter a year ago.
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