| SC 13G | 2015-03-10 | FIRST TRUST PORTFOLIOS LP | U.S. SILICA HOLDINGS, INC. | 5,361,493 | 10.0% | EDGAR |
| SC 13G/A | 2015-02-17 | MORGAN STANLEY | U.S. SILICA HOLDINGS, INC. | 3,149,771 | 5.8% | EDGAR |
| SC 13G | 2015-02-13 | ARIEL INVESTMENTS, LLC | U.S. SILICA HOLDINGS, INC. | - | - | EDGAR |
| SC 13G/A | 2015-02-11 | VANGUARD GROUP INC | U.S. SILICA HOLDINGS, INC. | 3,709,725 | 6.9% | EDGAR |
| SC 13G | 2015-01-29 | ICS OPPORTUNITIES, LTD. | U.S. SILICA HOLDINGS, INC. | 1,559,919 | 2.9% | EDGAR |
| SC 13G/A | 2014-08-07 | LAZARD ASSET MANAGEMENT LLC | U.S. SILICA HOLDINGS, INC. | 1,750,589 | 3.3% | EDGAR |
| SC 13G/A | 2014-02-14 | GGC Opportunity Fund Management, L.P. | U.S. SILICA HOLDINGS, INC. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2014-02-14 | LAZARD ASSET MANAGEMENT LLC | U.S. SILICA HOLDINGS, INC. | 3,547,272 | 6.6% | EDGAR |
| SC 13G | 2014-02-12 | VANGUARD GROUP INC | U.S. SILICA HOLDINGS, INC. | 2,980,741 | 5.6% | EDGAR |
| SC 13G | 2014-02-10 | MORGAN STANLEY | U.S. SILICA HOLDINGS, INC. | 4,030,358 | 7.5% | EDGAR |
| SC 13G | 2013-12-10 | LAZARD ASSET MANAGEMENT LLC | U.S. SILICA HOLDINGS, INC. | 3,501,426 | 6.6% | EDGAR |
| SC 13G | 2013-06-24 | SAC Capital Advisors LP | U.S. SILICA HOLDINGS, INC. | 1,921,164 | 3.6% | EDGAR |
| SC 13G | 2013-02-14 | GGC Opportunity Fund Management, L.P. | U.S. SILICA HOLDINGS, INC. | 41,176,471 | 77.9% | EDGAR |