Name
 | URL | Country
| Market Cap (US$)
|
|---|
| Schlumberger Ltd. | http://www.slb.com/ | United States | 72,636 |
| Transocean Inc. | http://www.deepwater.com | United States | 24,779 |
| Diamond Offshore Drilling, Inc. | http://www.diamondoffshore.com | United States | 10,328 |
| OMV AG | http://www.omv.com | Austria | 10,306 |
| Saipem S.p.A. | http://www.saipem.it | Italy | 8,906 |
| Noble Corporation | http://www.noblecorp.com | United States | 7,633 |
| ENSCO International Inc. | http://www.enscous.com | United States | 5,430 |
| Nabors Industries Ltd. | http://www.nabors.com | Bermuda | 4,530 |
| Helmerich & Payne, Inc. | http://www.hpinc.com | United States | 3,033 |
| FMC Corporation | http://www.fmc.com | United States | 2,448 |
| Rowan Companies, Inc. | http://www.rowancompanies.com | United States | 2,098 |
| Ensign Energy Services Inc | http://www.ensigngroup.com/ | Canada | 2,026 |
| Patterson-UTI Energy Inc | http://www.patenergy.com | United States | 1,989 |
| Unit Corporation | http://www.unitcorp.com | United States | 1,514 |
| Maurel et Prom | http://www.maureletprom.fr/ | France | 1,464 |
| Precision Drilling Trust | http://www.precisiondrilling.com/ | Canada | 1,434 |
| Acergy SA | http://www.acergy-group.com | Luxembourg | 1,296 |
| Subsea 7 Inc. | http://www.subsea7.com | Cayman Islands | 1,265 |
| Grey Wolf, Inc. | http://www.greywolfdrilling.com | United States | 1,027 |
| Copano Energy, L.L.C. | http://www.copanoenergy.com | United States | 1,027 |
|
