• Atlantic Operating, Inc.
  • BC Operating
  • Black Mountain Operating
  • Comstock Resources
  • Devon Energy
  • Discovery Natural Resources
  • Eagle Oil & Gas Co.
  • Fasken Oil & Ranch
  • Gulf United
  • Jagged Peak
  • Linn Energy
  • Murchison Oil & Gas, LLC
  • OGX Resources, LLC
  • Petrohawk Energy Corporation
  • Petro-Hunt
  • Read & Stevens, Inc.
  • Rosetta Resources
  • RMR Operating
  • Rex Energy
  • Silver Hill Energy Partners
  • Steward Energy
  • Thorp Petroleum
  • Three Rivers Operating Company, LLC
  • Trilogy Operating, Inc.
  • Tycoon Energy
  • Whiting Petroleum Corporation
  • XTO Energy