NEW YORK ( TheStreet) -- Zoltek Companies (Nasdaq: ZOLT) is trading at unusually high volume Tuesday with 1.1 million shares changing hands. It is currently at 4.2 times its average daily volume and trading down $1.39 (-9.5%) at $13.19 as of 11:55 a.m. ET. Zoltek Companies has a market cap of $289 million and is part of the industrial goods sector and industrial industry. Shares are up 91.3% year to date as of the close of trading on Monday. Zoltek Companies, Inc., through its subsidiaries, develops, manufactures, and markets carbon fibers and technical fibers primarily in Europe, the United States, and Asia. The company has a P/E ratio of 57, above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Zoltek Companies as a hold. The company's strengths can be seen in multiple areas, such as its robust revenue growth, largely solid financial position with reasonable debt levels by most measures and impressive record of earnings per share growth. However, as a counter to these strengths, we also find weaknesses including weak operating cash flow, a generally disappointing performance in the stock itself and poor profit margins. You can view the full Zoltek Companies Ratings Report. See all heavy volume stocks in our stocks moving on unusual volume list or get investment ideas from our investment research center. Interested in other stocks that are falling on unusually high volume? Get free SMS text alerts sent to you when the action happens by texting HVDOWN to 95370 or select from multiple alert options.