Recent customers include Rolls-Royce, Renault, Rover and Mitsubishi.
Other rivals include Mitsubishi of Japan, Kone of Finland and Dover Elevator Systems in Tennessee.
They include Honda, Nissan, Mazda, Mitsubishi and Suburu, as well as Toyota.
Other Japanese investors include Sony, Mitsubishi and Mitsui.
Its franchises include Volkswagen, Audi, Volvo, Mitsubishi, Mazda and Hyundai.
Other early supporters included Dell, HP, Mitsubishi and TDK.
Major companies include Seimens and Mitsubishi, ARLA foods and DairyCrest.
On Tuesday, Aristech said it had received a bid of $26 a share, or $845 million, from a group led by its chairman, Thomas Marshall, that included Mitsubishi.
Its marques include Kia, Mercedes-Benz, Mitsubishi and Citroen.
International investors include Mitsubishi and Hyundai.