U.S. Silica Holdings, Inc. is a materials company, which engages in the provision of commercial silica products. It operates through Oil and Gas Proppants; and Industrial and Specialty Products segments. The Oil and Gas Proppants segment focuses in delivering fracturing sand which is pumped down oil and natural gas wells to prop open rock fissures and increase the flow rate of natural gas and oil from the wells. The Industrial and Specialty products segment consists of products and materials used in a variety of industries including, container glass, fiberglass, specialty glass, flat glass, building products, fillers and extenders, foundry products, chemicals, recreation products and filtration products. The company was founded on November 14, 2008 and is headquartered in Frederick, MD.