- Antonio Associates
 - World wide geotechnical and rock engineering specialist. - Cyclotech Ltd
- Providers of process technology for the upstream oil and gas industry, particularly cyclones, hydrocyclones, sand and solids management, and separation technologies.
- Edinburgh Petroleum Services Ltd.
- Specialises in software development and consultancy for the international upstream oil and gas industry.
- Ensign Geophysics
- Specialist in seismic data processing for oil companies.
- Geochem Group, Ltd.
- Geological consultants to the oil industry and UKAS accredited environmental laboratory services.
- KBC Advanced Technologies
- Provides consultancy and support services to owners and operators of oil refineries.
- Petroglyphx Geoscience
- An independent commercial organisation of geoscientists and business consultants, operating internationally to service the geoscience sector of the oil industry.
- Production Geoscience Limited
- Oil and gas consultancy providing services to the oil industry including seismic inversion, petrophysics, software and 3D modelling.
- Qualfab Fabricating Engineers
- Major products include components for refineries with the emphasis on cyclone systems and other FCCU products.
- Stolt Offshore
- Contractor to the international offshore oil and gas industry, specialising in engineering, construction, and maintenance services.
- TFCW Consultants
- Serves the oil and gas industry.
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