U.S. SILICA HOLDINGS, INC. Certain shares of U.S. Silica Holdings, Inc.'s Common Stock are subject to a Lock-Up Agreement Ending on 4-JAN-2014. These shares will be under lockup for 30 days starting from 5-DEC-2013 to 4-JAN-2014.
Certain shares of U.S. Silica Holdings, Inc.'s Common Stock are subject to a Lock-Up Agreement Ending on 4-JAN-2014.
January 03, 2014
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