X0306 4 2019-02-12 0 0001524741 U.S. SILICA HOLDINGS, INC. SLCA 0001544409 Murry David D. C/O U.S. SILICA HOLDINGS, INC. 8490 PROGRESS DRIVE, SUITE 300 KATY TX 77494 0 1 0 0 SVP & President, ISP Common Stock 2019-02-12 4 A 0 10109 0.00 A 22356 D Common Stock 2019-02-12 4 A 0 5096 12.91 A 27452 D Common Stock 2019-02-12 4 F 0 2721 12.91 D 24731 D Represents restricted stock granted on February 12, 2019 which will vest in three equal installments on the anniversaries of the grant date. On March 31, 2016, the reporting person was granted performance-based restricted stock units subject to vesting based on the attainment of pre-established objective financial goals, business unit performance objectives and individual personal performance objectives. Certain performance criteria for 2018 were met, resulting in vesting of the grant as to 5,096 shares of the issuer's common stock on February 12, 2019. Represents tax withholding on vested performance-based stock. /s/ Robert M. Hayward, P.C. by Power of Attorney 2019-02-14