Tranche Update on Kronos Worldwide, Inc.'s Equity Buyback Plan announced on December 9, 2010.

Kronos Worldwide, Inc. is a global producer and marketer of value-added titanium dioxide pigments, or TiO2, a base industrial product used in a wide range of applications. The Company, along with its distributors and agents, sells and provides technical services for its products. TiO2 is a white inorganic pigment used in applications, such as coatings, plastics and paper, as well as many specialty products such as inks, cosmetics and pharmaceuticals. The Company offers its customers a broad portfolio of products that include over 50 different TiO 2 pigment grades under the KRONOS trademark, which provide a variety of performance properties to meet customers' specific requirements. The Company manufactures and sells iron-based chemicals, which are co-products and processed co-products of the sulfate and chloride process TiO2 pigment production. It also manufactures and sells other specialty chemicals, which are side-stream products from the production of TiO2.