List of subsidiaries of U.S. Silica Holdings, Inc.

EX-21.1 4 d316539dex211.htm LIST OF SUBSIDIARIES OF U.S. SILICA HOLDINGS, INC. List of subsidiaries of U.S. Silica Holdings, Inc.

Exhibit 21.1


Name		Jurisdiction of Formation

Hourglass Acquisition I, LLC		Delaware

Preferred Rocks USS Inc.		Delaware

Hourglass Holdings, LLC		Delaware

USS Holdings, Inc.		Delaware

U.S. Silica Company		Delaware

The Fulton Land and Timber Company		Pennsylvania

Pennsylvania Glass Sand Corporation		Delaware

BMAC Services Co. Inc.		Delaware

Coated Sand Solutions, LLC		Delaware

Ottawa Silica Company		Delaware

Ottawa Silica Company, Ltd.		Quebec