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

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