X0306 4 2013-11-07 0 0001524741 U.S. SILICA HOLDINGS, INC. SLCA 0001531831 Shinn Bryan Adair C/O U.S. SILICA HOLDINGS, INC. 8490 PROGRESS DRIVE FREDERICK MD 21701 1 1 0 0 President & CEO Common Stock, par value $0.01 17285 D Common Stock, par value $0.01 2013-11-07 4 J 0 25411 0.00 D 17576060 I See footnote On November 7, 2013, GGC USS Holdings, LLC ("Holdings") distributed 25,411 shares of common stock of U.S. Silica Holdings, Inc. to certain funds that beneficially own interests in Holdings. None of the shares were distributed to Mr. Shinn. Mr. Shinn has a beneficial ownership interest in Holdings, which is the direct beneficial owner of shares of common stock of U.S. Silica Holdings, Inc. Mr. Shinn does not have voting or dispositive power over shares held by Holdings. Mr. Shinn disclaims beneficial ownership of the shares held by Holdings, except to the extent of his pecuniary interest therein. /s/ Sean J. Klein by Power of Attorney 2013-11-12