- Amerada Hess Corporation
- Anadarko Petroleum Corporation
- Chevron
- CooperSurgical, Inc.
- GX Technology Corporation
- IHS Energy
- Input/Output, Inc.
- Lyondell Chemical
- Landmark Graphics Corporation
- Marathon Oil
- Paradigm Geophysical, Inc.
- Petris Technology, Inc.
- Roxar Software Solutions
- Santos LTD
- Santos USA Corporation
- Schlumberger Information Solutions
- Shell Chemicals
- Shell Oil Company
- Shell Exploration and Production Company
