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Cornerstone Petroleum Resources

Cornerstone Petroleum Resources is an exploration and production company located in Fort Worth, Texas. The company primarily focuses on the development of shale oil resources via joint ventures, farm-ins and organic leasing opportunities with existing acreage owners and operators. Cornerstone is managed by a team of proven operational experts in horizontal drilling and hydraulic fracturing techniques, led by Lee Matthews (President and CEO).

Initial Investment: 2013
Realized Date: July 2025
  • Chaparral Energy
  • Nadel and Gussman NV, LLC
  • Post Oak Minerals I
  • Mavros Minerals
  • Crown Oil Partners V/ BC Operating
  • SandRidge Energy, Inc.
  • Post Oak Minerals V
  • Maverick Brothers Energy
  • Bayou Well Services
  • UpCurve II
  • Double Eagle Energy Permian
  • Refinery Specialties, Inc.
  • EV Energy Partners
  • Linn Energy, LLC
  • Balcones Energy Holdings
  • Oryx Midstream Services
  • Broken Oak Investments LLC
  • Permian Resources
  • Tri-C Energy Partners, LLC
  • Post Oak Minerals III
  • Mavros Minerals II
  • Petro Peak Energy
  • Oryx Midstream Services II
  • Switchgrass E&P, LLC
  • Prime Downhole Manufacturing
  • Post Oak Minerals II
  • Moriah Henry Partners
  • Midway Energy Partners
  • Ichthys Energy Partners
  • Crown Oil Partners IV/ BC Operating
  • RAM Energy Resources
  • PetroEdge Energy III
  • National Specialty Alloys
  • Tiburon Oil & Gas Partners, LLC
  • Sierra EF, LP
  • Richland-Stryker Generation, LLC
  • Core Minerals Management II
  • Cornerstone Petroleum Resources
  • Breitburn Energy Partners L.P.
  • UpCurve Energy
  • Layne Water Midstream
  • Atlas Energy Resources, LLC
  • Quantent Energy Partners, LLC
  • Rimrock Resource Operating
  • Crown Oil Partners VI/ BC Operating
  • CPX Piceance, LLC
  • Black Oak Resources, LLC
  • PetroEdge Energy IV

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