| Argo Geological Consultants  | Centrica Upstream | Chevron Exploration and Production Netherlands |
| Cirrus Energy | dGB Earth Sciences | DSM Energie | Dyas | EBN |
| ENRES International | Fugro Geoscience | GDF SUEZ E&P Nederland B.V. |
| Hansa Hydrocarbons |  JOA | Oranje Nassau Energie |
| PanTerra Geoconsultants | Petro-Canada Netherlands | PGS |
| Shell Exploration & Production | Terra Incognita Geoconsultancy and Geobooks |
| TNO Bouw & Ondergrond | Total E & P Nederland |
| TU Delft | Wintershall Noordzee |