1. Atlas Sand Company
LLC.
2. Badger Mining Corporation
3. Baker Hughes Company
4. Carbo Ceramics Inc.
5. ChangQing Proppant Corporation
6. Fineway Inc.
7. Fores Ltd.
8. Fulton Tec Group
9. Hexion Inc.
10. Hi-Crush Inc.
11. MS Industries II
LLC
12. Nika Petrotech LLC
13. Preferred Sand LLC
14. R.W. Sidley Inc.
15. U.S. Silica Holdings Inc.