- Credo Petroleum Corporation
 - Denver - Explores for, purchases, develops, produces, and sells crude oil and natural gas. - Forest Oil Corporation
- Denver - Engaged in the exploration, acquisition, development, production, and marketing of natural gas and crude oil.
- Platte River Associates, Inc.
- Denver - Basin modelling software and services including digital public land survey data.
- Rooney Engineering, Inc.
- Englewood - Specialises in turnkey liquid and gas pipeline services, from feasibility and design through procurement and construction management.
- Sagebrush Petroleum, Inc.
- Denver - Offers oil and gas exploration.
- Summit Energy Group
- Longmont - Offers consulting in the energy, environment and natural resource areas.
- Tom Brown
- Denver - Engaged in the exploration, development, acquisition, production, and marketing of natural gas, natural gas liquids, and crude oil.
- Vector Seismic Data Processing, Inc.
- Denver - Provides seismic solutions and geophysical services to the oil and gas exploration industry.
- Well Master Corporation
- Lakewood - Manufactures a complete line of downhole tools for plunger lift, plungers, wellhead lubricators, and electronic controls including automation and telemetry.
- Wildhorse Industries, Inc.
- Brighton - Manufactures Par Amine 250, an environmentally friendly chemical that protects natural gas pipelines against biological (MIC) and chemical corrosion.
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