U.S. Silica Holdings, Inc., a Katy, Texas-based producer and seller of commercial silica in the United States, operates through two distinct segments, Oil & Gas Proppants and Industrial & Specialty Products. Specifically, the company provides whole grain commercial silica products for use in fracturing sand for oil and natural gas recovery, in addition to whole grain silica products of varying size distributions, grain shapes, and chemical purity levels for the manufacturing of glass products. Moreover, the firm offers several different grades of whole-grain round silica to the foundry industry, as well as ground silica and industrial minerals products for various products. U.S. Silica also provides engineered performance materials made from diatomaceous earth (DE), clay, and perlite, as well as transportation, equipment rental, and contract labor services. With end markets including oilfield services companies, exploration and production companies involved in hydraulic fracturing, building and construction products, chemicals, fillers and extenders, filtration, glass, sports, recreation, and industrial and specialty products, U.S. Silica is a leader in its category. Corporate history states that the company was founded in 1894 and was formerly known as GGC USS Holdings Inc. before adopting its current name in July 2011.