| 1 | Western Energy Services Corp. |
| 2 | Noble Corporation Plc |
| 3 | Transocean Ltd. |
| 4 | Lapidoth-Heletz Limited Partnership |
| 5 | Vantage Drilling International |
| 6 | Arabian Drilling Company |
| 7 | AKITA Drilling Ltd. |
| 8 | Archer Limited |
| 9 | Borr Drilling Limited |
| 10 | Sinopec Oilfield Service Corporation |
| 11 | Sinopec Oilfield Service Corporation |
| 12 | Cathedral Energy Services Ltd. |
| 13 | Vantage Drilling Company |
| 14 | Ensign Energy Services Inc. |
| 15 | Patterson-UTI Energy, Inc. |
| 16 | Awilco Drilling PLC |
| 17 | Shelf Drilling, Ltd. |
| 18 | Borr Drilling Limited |
| 19 | Treasure Island Royalty Trust |
| 20 | Noble Corporation Plc |
| 21 | Odfjell Drilling Ltd. |
| 22 | Noble Corporation Plc |
| 23 | PHX Energy Services Corp. |
| 24 | PHX Energy Services Corp. |
| 25 | Helmerich & Payne, Inc. |
| 26 | Northern Drilling Ltd. |
| 27 | Noble Corporation |
| 28 | Aban Offshore Limited |
| 29 | Frontier Energy Corporation |
| 30 | AKITA Drilling Ltd. |
| 31 | Shelf Drilling, Ltd. |
| 32 | Cathedral Energy Services Ltd. |
| 33 | Northern Ocean Ltd. |
| 34 | Paradigm Oil and Gas, Inc. |
| 35 | Nabors Industries Ltd. |
| 36 | Wild Brush Energy, Inc. |
| 37 | Agri Dynamics, Inc. |
| 38 | Western Energy Services Corp. |
| 39 | Sinopec Oilfield Service Corporation |
| 40 | EXLA Resources Inc. |
| 41 | Justiss Oil Co |
| 42 | Ensign Energy Services Inc. |
| 43 | Precision Drilling Corporation |
| 44 | Dolphin Drilling AS |
| 45 | XinJiang Beiken Energy Engineering Co.,Ltd. |
| 46 | Precision Drilling Corporation |
| 47 | Noble Corporation Plc |
| 48 | Seadrill Limited |
| 49 | Daldrup & Söhne Aktiengesellschaft |
| 50 | Diamond Offshore Drilling, Inc. |
| 51 | Seadrill Limited |
| 52 | PT Apexindo Pratama Duta Tbk |
| 53 | Stampede Drilling Inc. |
| 54 | Awilco Drilling PLC |
| 55 | Diamond Offshore Drilling, Inc. |
| 56 | EnerNorth Industries Inc. |
| 57 | Independence Contract Drilling, Inc. |