U.S. Silica Holdings, Inc. (NYSE: SLCA) today announced the pricing of an underwritten secondary public offering of 8,500,000 shares of U.S. Silica common stock at $22.00 per share. The shares are being sold by GGC USS Holdings, LLC, an affiliate of Golden Gate Capital, an existing stockholder of the Company. U.S. Silica is not selling any shares and will not receive any proceeds from the offering. In connection with the offering, the selling stockholder has granted the underwriters a 30-day option to purchase an additional 1,275,000 shares in the offering. The offering is expected to close on March 19, 2013. Morgan Stanley & Co. LLC, BofA Merrill Lynch, Simmons & Company International, Jefferies LLC and Wells Fargo Securities, LLC are acting as joint book-running managers for the offering. This offering is being made by means of a prospectus supplement and accompanying base prospectus, copies of which may be obtained by sending a request to: Morgan Stanley & Co. LLC, Attention: Prospectus Department, 180 Varick Street, 2 nd floor, New York, NY 10014, Telephone: 866-718-1649, Email: email@example.com or BofA Merrill Lynch, Attention: Prospectus Department, 222 Broadway, New York, NY 10038, Email: firstname.lastname@example.org. This offering is being made pursuant to an effective shelf registration statement filed with the Securities and Exchange Commission. This press release shall not constitute an offer to sell or the solicitation of an offer to buy the Company’s common stock or any other securities, and there shall not be any offer, solicitation or sale of securities mentioned in this press release in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such any state or jurisdiction. About U.S. Silica U.S. Silica Holdings, Inc., a Delaware corporation, is the second largest domestic producer of commercial silica, a specialized mineral that is a critical input into the oil and gas proppants end market. The company also processes ground and unground silica sand for a variety of industrial and specialty products end markets such as glass, fiberglass, foundry molds, municipal filtration and recreational uses. During its 100-plus year history, U.S. Silica Holdings, Inc. has developed core competencies in mining, processing, logistics and materials science that enable it to produce and cost-effectively deliver over 250 products to customers across these end markets. U.S. Silica Holdings, Inc. is headquartered in Frederick, Maryland.