1 (20) | Exploration and Petroleum Engineering Advanced Research Center, SAU | SAU | ||
2 (41) | Saudi Arabian Oil Co, Saudi Arabia | SAU | ||
3 (1428) | Abu Dhabi National Oil Co * | ARE | ||
4 (2835) | Petroleum Development Oman LLC | OMN | ||
5 (3271) | Kuwait Petroleum Corporation * | KWT | ||