| All Rigs |
927 |
| Alliance Offshore Drilling |
3 |
| Apexindo Offshore Pte. Ltd. |
2 |
| Arabian Drilling |
8 |
| Arktikmorneftegazrazvedka |
2 |
| ARO Drilling |
5 |
| Atlantic Drilling |
1 |
| Atlantic Marine Services |
3 |
| Atlantica Tender Drilling Ltd |
3 |
| Awilco Drilling Plc |
2 |
| Axxis Petroconsultants |
1 |
| Base |
5 |
| Beijing Petrolor Oilfield Services Co Ltd |
2 |
| Bestford Offshore Pte Ltd |
6 |
| BKE Shelf Ltd. |
4 |
| Bluewhale Offshore |
10 |
| Borr Drilling |
49 |
| Caspian Drilling Company |
3 |
| Chernomorneftegaz |
4 |
| China Merchant Heavy Industries |
2 |
| China National Petroleum Corp (CNPC) |
1 |
| China National Petroleum Offshore Engineering Co.Ltd |
10 |
| China Oilfield Services Limited (COSL) |
46 |
| China Petroleum Technology and Development Corporation (CPTDC) |
6 |
| China State Shipbuilding Corporation (CSSC) |
2 |
| Clearwater Capital Partners |
1 |
| Compania Perforadora Mexico, S.A. DE C.V. (PEMSA) |
5 |
| CP Latina |
2 |
| Crosco Integrated Drilling & Well Services Co., Ltd. |
1 |
| Daewoo Shipbuilding & Marine Engineering |
1 |
| Dalian Shipyard |
1 |
| Deepsea Offshore International Corporation |
2 |
| Diamond Offshore Drilling |
18 |
| Dolphin Drilling Ltd. |
7 |
| Dynamic Drilling Holdco Pte. Ltd. |
4 |
| Egyptian Drilling Company (EDC) |
6 |
| Energean Oil & Gas |
1 |
| Energy Drilling Pte Ltd |
3 |
| Ensco Plc |
61 |
| Enterprise Offshore Drilling |
13 |
| Essar Oilfields Services Ltd. |
1 |
| ESSM Pte Ltd |
2 |
| ETESCO Construções e Comércio Ltda. |
1 |
| Ezion Holdings Limited |
2 |
| Fecon International Corporation |
3 |
| Focus Offshore Services Private Ltd |
1 |
| Frigstad Offshore |
1 |
| FTSG Co. Ltd. |
5 |
| Gazflot |
4 |
| Global Petro Tech (GPT) |
2 |
| Goimar S.A. de C.V |
2 |
| GOL Offshore (Great Offshore) |
2 |
| Greatship Global Offshore Services Pte Ltd. |
4 |
| Grup Servicii Petroliere S.A. (GSP) |
8 |
| Grupo R |
7 |
| Gulf Drilling International |
9 |
| Halling Offshore Ltd |
1 |
| Hallworthy International FZC |
6 |
| Harmoni Drilling Services |
1 |
| Industrial Perforadora de Campeche, S.A. de C.V. |
1 |
| Integradora de Servicios Petroleros Oro Negro |
4 |
| Jagson Internation Ltd. |
5 |
| Japan Drilling Co., Ltd. |
8 |
| Jasper Drilling Pte Ltd. |
1 |
| Jindal Drilling & Industries Ltd |
6 |
| Karon Shipping & Trading Company Inc. |
1 |
| KCA Deutag Drilling Ltd. |
2 |
| Keppel Offshore & Marine |
1 |
| KMG Drilling & Services LLP |
1 |
| Korea National Oil Corporation |
1 |
| Korea National Oil Corporation (KNOC) |
1 |
| KS Drilling Pte Ltd |
5 |
| Lexanda International |
1 |
| LOTOS Petrobaltic S.A. |
1 |
| Lovanda Offshore Ltd |
1 |
| Lovansing Offshore Ltd |
1 |
| Maersk Drilling |
23 |
| Mapna Group |
1 |
| MENAdrill Investment Company (MIC) |
2 |
| Mermaid Drilling Ltd. |
2 |
| Momentum Engineering |
1 |
| Nabors Offshore |
3 |
| National Drilling Company (NDC) |
20 |
| National Iranian Oil Company (NIOC) |
3 |
| Newbury Holdings Two Ltd. |
1 |
| Noble Drilling |
28 |
| North Atlantic Drilling AS |
8 |
| North Drilling Company |
4 |
| North Star Oil Drilling LLP |
1 |
| Northern Drilling |
2 |
| Northern Offshore Ltd |
6 |
| Ocean Rig Management Inc. |
13 |
| Odebrecht Óleo e Gás S.A. |
6 |
| Odfjell Drilling |
8 |
| Offshore Logistics (Asia Pacific) Pte Ltd |
1 |
| Oil & Natural Gas Corporation (ONGC) |
1 |
| Oil & Natural Gas Corporation Ltd. (ONGC) |
7 |
| Operadora CICSA S.A. de C.V. |
1 |
| Oro Negro |
1 |
| Ostovan Kish Drilling Company |
2 |
| Pacific Drilling S.A. |
7 |
| PDVSA Petroleo SA |
4 |
| Perforadora Central S.A. de C.V |
7 |
| Perisai Drilling |
1 |
| Petro Gohar Farasahel Kish (PGFK) |
3 |
| Petrofor |
1 |
| Petroleo Brasileiro S.A. |
3 |
| Petróleos Mexicanos S.A. de C.V. (PEMEX) |
3 |
| PetroSaudi Oil Services Ltd. |
1 |
| Petroserv S.A. |
5 |
| PetroVietnam |
5 |
| PolyNOR Drilling |
2 |
| Primepoint Drilling Pte Ltd |
4 |
| PT Apexindo |
1 |
| Pyramid Drilling S.A.E. |
1 |
| Queiroz Galvão Óleo e Gás |
8 |
| Rowan |
25 |
| Saga Drilling AS |
2 |
| Saipem |
10 |
| Samsung Heavy Industries |
2 |
| SapuraKencana Drilling Pte. Ltd. |
16 |
| SAROST S.A. |
1 |
| Savannah Oil Services |
1 |
| Scorpio Drilling International |
1 |
| Scott & English Energy |
1 |
| Seadrill Ltd |
47 |
| Seadrill Partners LLC |
10 |
| Seawolf Oilfield Services Ltd. |
3 |
| Selective Marine Services |
1 |
| Shanghai Waigaoqiao |
3 |
| Shelf Drilling, Ltd. |
38 |
| Ship Finance International Limited |
1 |
| Shiv-Vani Singapore Pte. Ltd. |
1 |
| SINOPEC Shengli Oilfield Company |
11 |
| SinoTharwa Drilling Company |
1 |
| Songa Opus Offshore Drilling Pte Ltd |
4 |
| Spartan Offshore Drilling LLC |
4 |
| State Oil Company of Azerbaijan Republic (SOCAR) |
9 |
| Stena Drilling Ltd. |
7 |
| Swift Drilling B.V. |
1 |
| TH Tianjin Binhai Heavy Industry Machinery (TYHI) |
1 |
| Tianjin Haiheng Shipbuilding & Offshore Engineering Service Co., Ltd. |
2 |
| Transocean Offshore Deepwater Drilling Inc. |
46 |
| Transocean Partners |
3 |
| UMW Offshore Drilling Sdn Bhd |
7 |
| Upstream Drilling Pte Ltd |
1 |
| Vanda Offshore Ltd |
1 |
| Vantage Drilling Company |
10 |
| Varada-HvR Drilling Pte Ltd |
3 |
| VietSovPetro |
5 |
| Viking Offshore & Marine Ltd |
2 |
| V-Ships |
1 |
| Well Services Petroleum Co. Ltd. |
4 |
| 361 Projects Pte. Ltd |
1 |
| Aban Offshore Ltd. |
17 |
| Advanced Energy Systems |
13 |