Westlake Chemical | NYSE: WLK WLK, Olefins: Ethylene, Polyethylene, Styrene, Epolene, Propylene WLK: NYSE, Westlake makes chemical and plastic products, which in turn make life better for people every day. We are a quality manufacturer and dependable global supplier of petrochemicals, plastics and building products. Our mission is to serve our clients by enhancing daily life through the products and services we provide.