Members
| Paid 2024/2025 membership | Paid 2025/2026 annual payment | |
| BP | Yes | Yes |
| Chevron | Yes | Yes |
| ConocoPhillips | Yes | Yes |
| Diamondback Energy | Yes | Yes |
| Eni | Yes | – |
| ExxonMobil | Yes | Yes |
| Hess Corp | Yes | Yes |
| Occidental | Yes | – |
| Petrobras | Yes | Yes |
| Shell | Yes | Yes |
| Woodside | Yes | – |