| Onbekend |
| ATP Oil and Gas Netherlands B.V. |
| Centrica Production Nederland B.V. |
| Chevron U.S.A. Inc. |
| Clyde Petroleum |
| Dana Petroleum Netherlands B.V. |
| ENGIE E&P Nederland B.V. |
| N.V. Nederlandse Gasunie |
| Nederlandse Aardolie Maatschappij B.V. |
| Neptune Energy Netherlands B.V. |
| ONE-Dyas B.V. |
| Oranje-Nassau Energie B.V. |
| Sterling Resources Netherlands B.V. |
| TAQA Onshore B.V. |
| Total E&P Nederland B.V. |
| Transcanada International Ltd. |
| Tulip Oil Netherlands B.V. |
| Tullow Netherlands B.V. |
| Petrogas E&P Netherlands B.V. |
| Spirit Energy Nederland B.V. |
| Taqa Energy B.V. |
| TAQA Offshore B.V. |
| Taqa Piek Gas B.V. |
| Vermilion Energy Netherlands B.V. |
| Wintershall Noordzee B.V. |
| anders/onbekend |