| 1 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 2 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Sep 2026 |
| 3 | R.K.G. Operations, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Jun 2004 |
| 4 | Rampart Petroleum, Incorporated | Buffalo Gap, TX 79508 | Oil & Gas Operator | Jan 2009 |
| 5 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2026 |
| 6 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | Sep 2026 |
| 7 | Rayco Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2026 |
| 8 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Sep 2026 |
| 9 | Reddirt Operating, LLC. | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 10 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 11 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 12 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Sep 2026 |
| 13 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Sep 2026 |
| 14 | Riata Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2006 |
| 15 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 16 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 17 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 18 | Ridgeline Resources, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 19 | Rio Interstate Oil, Inc. | Oklahoma City, OK 73189 | Oil & Gas Operator | Sep 1994 |
| 20 | Rising Star Energy PTR, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Jun 2025 |
| 21 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 22 | Rivercity Operating, Inc. | Austin, TX 78766 | Oil & Gas Operator | Sep 2026 |
| 23 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Sep 2026 |
| 24 | Rolling Hills Oil & Gas, Inc | Austin, TX 78731 | Oil & Gas Operator | Sep 2026 |
| 25 | RRP Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Sep 2026 |
| 26 | Rusk Co. Well Service Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 27 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Sep 2026 |