NEW YORK (TheStreet) -- RATINGS CHANGES
Ameresco (AMRC) was upgraded to hold at TheStreet Ratings.
3D Systems (DDD) was initiated with a buy rating at Stifel Nicolaus. Twelve-month price target is $65. Business is poised to rebound in the second half of the year, Stifel Nicolaus said.
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Exterran (EXH) was upgraded to buy at TheStreet Ratings.
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