2019-6-26 · Suez SA is a French-based utility company which operates largely in the water treatment and waste management sectors. Formerly an operating division of Suez, the company was spun out as a stand-alone entity as part of the merger to form GDF Suez (now Engie) on 22 July 2008.[3] Engie remains the largest shareholder of the company with a 35% ...