NEW YORK, Sept. 27, 2013 /PRNewswire/ -- Pomerantz Grossman Hufford Dahlstrom & Gross LLP is investigating claims on behalf of investors of Zoltek Companies, Inc. ("Zoltek" or the "Company") (NASDAQ: ZOLT) (ISIN: US98975W1045) (CUSIP: 98975W104) concerning the proposed......
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