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

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