1. Halliburton Latin America S.R.L. (Ecuador)
2. Schlumberger del Ecuador S.A.
3. Baker Hughes of Mexico S. de R.L. de C.V.
4. ExxonMobil Corporation
5. Arabian American Oil Company (ARAMCO)
6. Petroleo Brasileiro SA
7. Equinor ASA
8. Chevron Corporation
9. China Petroleum & Chemical Corporation
10. BP p.l.c