Name
 | URL | Country
| Market Cap (US$)
|
|---|
| ENI SpA | http://www.eni.it | Italy | 96,508 |
| Schlumberger Ltd. | http://www.slb.com/ | United States | 56,005 |
| Halliburton Company | http://www.halliburton.com | United States | 17,580 |
| PTT Exploration & Production PC, Ltd | http://www.pttep.com | Thailand | 11,774 |
| Hyundai Heavy Industries Co., Ltd. | http://www.hhi.co.kr | South Korea | 10,238 |
| Polskie Gornictwo Naftowe I Gazownictwo SA | http://www.pgnig.pl | Poland | 7,005 |
| China Oilfield Services Ltd | http://www.cnoocs.com/ | China | 4,136 |
| BJ Services Company | http://www.bjservices.com | United States | 3,729 |
| Nabors Exchangeco (Canada) Inc. | http://www.nabors.com | Bermuda | 3,520 |
| Queensland Gas Company Ltd | http://www.qgc.com.au | Australia | 3,383 |
| Pride International, Inc. | http://www.prde.com | United States | 3,176 |
| Worleyparsons Limited | http://www.worleyparsons.com | Australia | 2,509 |
| Essar Oil Limited | http://www.essar.com | India | 2,328 |
| Tidewater Inc. | http://www.tdw.com | United States | 2,225 |
| Linn Energy, LLC | http://www.linnenergy.com | United States | 1,849 |
| Oceaneering International, Inc. | http://www.oceaneering.com/ | United States | 1,727 |
| Core Laboratories N.V. | http://www.corelab.com | Netherlands | 1,574 |
| Petrobras Energia SA | http://www.petrobrasenergia.com/ | Argentina | 1,493 |
| Superior Energy Services, Inc. | http://www.superiorenergy.com | United States | 1,385 |
| Atwood Oceanics, Inc. | http://www.atwd.com/ | United States | 1,183 |
|
