Name
 | URL | Country
| Market Cap (US$)
|
|---|
| Schlumberger Ltd. | http://www.slb.com/ | United States | 117,561 |
| Transocean Inc. | http://www.deepwater.com | United States | 41,554 |
| Diamond Offshore Drilling, Inc. | http://www.diamondoffshore.com | United States | 15,457 |
| Noble Corporation | http://www.noblecorp.com | United States | 13,779 |
| SNP Petrom S.A. | http://www.petrom.ro/romana | Romania | 10,820 |
| Nabors Industries Ltd. | http://www.nabors.com | Bermuda | 10,273 |
| ENSCO International Inc. | http://www.enscous.com | United States | 9,891 |
| Helmerich & Payne, Inc. | http://www.hpinc.com | United States | 6,036 |
| FMC Corporation | http://www.fmc.com | United States | 5,367 |
| Patterson-UTI Energy Inc | http://www.patenergy.com | United States | 4,621 |
| Rowan Companies, Inc. | http://www.rowancompanies.com | United States | 4,288 |
| Ensign Energy Services Inc | http://www.ensigngroup.com/ | Canada | 3,331 |
| Unit Corporation | http://www.unitcorp.com | United States | 3,330 |
| Subsea 7 | http://www.dsnd.com/ | Norway | 3,126 |
| Acergy SA | http://www.acergy-group.com | Luxembourg | 3,034 |
| Precision Drilling Trust | http://www.precisiondrilling.com/ | Canada | 2,647 |
| Maurel et Prom | http://www.maureletprom.fr/ | France | 2,422 |
| Prosafe SE | http://www.prosafe.com | Cyprus | 1,995 |
| Hercules Offshore Inc. | http://www.herculesoffshore.com | United States | 1,995 |
| Aban Offshore Ltd | NA | India | 1,921 |
|
