U.S. Silica Holdings, Inc. produces and sells commercial silica in the United States. The company operates through two segments, Oil & Gas Proppants and Industrial & Specialty Products. It offers whole grain commercial silica products to be used as fracturing sand in connection with oil and natural gas recovery, as well as sells its whole grain silica products in various size distributions, grain shapes, and chemical purity levels for manufacturing glass products. The company also provides ground commercial silica products for use in plastics, rubber, polishes, cleansers, paints, glazes, textile fiberglass, and precision castings; fine ground silica for use in premium paints, specialty coatings, sealants, silicone rubber, and epoxies; and engineered performance materials made from diatomaceous earth (DE), clay, and perlite. In addition, it offers other industrial mineral products, such as aplite, a mineral used to produce container glass and insulation fiberglass; magnesium silicate, a adsorbent made from a mixture of silica and magnesium for preparative and analytical chromatography applications; and DE and clay aggregates used as an absorbent for automotive, industrial, and sports turf applications. Further, the company provides transportation, equipment rental, and contract labor services. U.S. Silica Holdings, Inc. serves oilfield services companies, and exploration and production companies that are engaged in hydraulic fracturing; and industrial and specialty products end markets. The company was formerly known as GGC USS Holdings, Inc. U.S. Silica Holdings, Inc. was incorporated in 2008 and is headquartered in Katy, Texas.