U.S. Silica Holdings, Inc. produces and sells commercial silica in the United States. It operates through two segments: Oil & Gas Proppants and Industrial & Specialty Products. The company offers whole grain commercial silica products to be used as frac for oil and natural gas recovery, as well as sells its whole grain silica products for the manufacturing of glass products. It also provides various grades of whole-grain round silica to the foundry industry; ground silica and industrial minerals products used for various products; and engineered performance materials made from diatomaceous earth (DE), clay, and perlite. In addition, the company offers transportation, equipment rental, and contract labor services. It serves oilfield services companies, and exploration and production companies that are engaged in hydraulic fracturing, building and construction products, chemicals, fillers and extenders, filtration, glass, sports, recreation, and industrial and specialty products end markets. The company was formerly known as GGC USS Holdings Inc. and changed its name to U.S. Silica Holdings, Inc. in July 2011. U.S. Silica Holdings, Inc. was founded in 1894 and is headquartered in Katy, Texas.