With headquarters in Phoenix, Arizona, Tessenderlo Kerley, Inc. (TKI) produces and markets specialty chemical solutions, incl ... uding fertilizers, crop protection chemicals and process chemicals and services to diverse markets around the world. TKI operates 11 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. read more