| 1 | Ramsower Minerals Corporation | Beeville, TX 78104 | Oil & Gas Operator | Sep 2013 |
| 2 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2024 |
| 3 | Rec Well Service, Inc. | Pleasanton, TX 78064 | Oil & Gas Operator | Jul 2008 |
| 4 | Reddy Disposals, LLC | Beeville, TX 78104 | Oil Operator | Dec 2024 |
| 5 | Redhorn Resources, LLC | Spring, TX 77393 | Oil Operator | Dec 2024 |
| 6 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 7 | Rego Development Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2002 |
| 8 | Reh Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Dec 2024 |
| 9 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2024 |
| 10 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Dec 2024 |
| 11 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Dec 2024 |
| 12 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2024 |
| 13 | Richter Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2007 |
| 14 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 15 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2024 |
| 16 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Dec 2024 |
| 17 | Rio Bravo Expl. & Prod. Co. | Houston, TX 77055 | Oil & Gas Operator | Apr 2020 |
| 18 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 19 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 20 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2024 |
| 21 | Rock Resources, Inc. | Corpus Chrsti, TX 78414 | Oil & Gas Operator | Dec 2024 |
| 22 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Dec 2024 |
| 23 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 24 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 25 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2024 |
| 26 | RR Ventures Limited Partnership | San Antonio, TX 78239 | Oil & Gas Operator | Dec 2024 |
| 27 | Ruwco Oil And Gas Corp. | Austin, TX 78701 | Oil & Gas Operator | Aug 2021 |