With headquarters in Phoenix, Arizona, Tessenderlo Kerley, Inc. produces and markets specialty chemical solutions, including fertilizers, crop protection chemicals and process chemicals and services to diverse markets around the world. Tessenderlo Kerley operates 12 manufacturing plants in North America in addition to an extensive terminal network. In 2017, TKI celebrated 70 Years of Growth.Tessenderlo Group is a diversified industrial group that focuses on agriculture, valorizing bio-residuals and providing industrial solutions. Founded and headquartered in 1919 in Belgium.