Zoltek Companies, Inc., is a holding company, which operates through wholly owned subsidiaries, Zoltek Corporation, Zoltek Zrt., Zoltek de Mexico SA de CV, Zoltek de Occidente SA de CV, Engineering Technology Corporation (Entec Composite Machines), Zoltek Properties, Inc., and Zoltek Automotive, LLC. Zoltek Corporation (Zoltek) develops, manufactures and markets carbon fibers and technical fibers in the United States. The Company is an applied technology and advanced materials company. The Company operates in three segments: carbon fibers, technical fibers and corporate/other products. It commercialization of carbon fiber through composites used in a range of commercial products, which it sells under the Panex trade name. On February 28, 2014, Toray Industries Inc completed the acquisition of Zoltek Companies, Inc.