Descrição Contran is a holding company that owns stakes of varying sizes in subsidiaries, including the largest, Valhi, Inc. (a publicly traded company about 95% controlled by Contran). Primarily through Valhi, the company has stakes in diversified operations in chemicals (NL Industries and Kronos Worldwide); metals (Titanium Metals Corporation); waste management (Waste Control Specialists); and computer support systems, precision ball bearing slides, and security products (CompX International). Contran also holds a controlling interest in Keystone Consolidated Industries, a maker of fencing and wire products. Trusts benefiting chairman Harold Simmons' family (with Simmons as the sole trustee) own 95% of Contran.