Members
| Membership | Paid 2023/2024 annual payment | Paid 2024/2025 annual payment | |
| BP | Full | Yes | Yes |
| Chevron | Full | Yes | Yes |
| ConocoPhillips | Full | Yes | Yes |
| Diamondback Energy | Full | – | Yes |
| Eni | Full | Yes | Yes |
| ExxonMobil | Full | Yes | Yes |
| Hess Corp | Full | Yes | Yes |
| Occidental | Full | Yes | Yes |
| Petrobras | Full | Yes | Yes |
| Shell | Full | Yes | Yes |
| Woodside | Full | Yes | Yes |