| 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 | Dec 2025 |
| 3 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 4 | Raptor Petroleum II, LLC | Houston, TX 77251 | Oil & Gas Operator | Dec 2025 |
| 5 | Raw Oil & Gas, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2025 |
| 6 | Reagle Production Co. | Snyder, TX 79549 | Oil & Gas Operator | Apr 2004 |
| 7 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 8 | Redmon Oil Company, Inc., The | Plano, TX 75023 | Oil & Gas Operator | Dec 2025 |
| 9 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Dec 2025 |
| 10 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 11 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 12 | Renaud Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 13 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 14 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 15 | RJD Management Co., Inc. | Lubbock, TX 79408 | Oil & Gas Operator | Dec 2025 |
| 16 | Robert C. Brower, LLC | Southlake, TX 76092 | Oil & Gas Operator | Dec 2025 |
| 17 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 18 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 19 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 20 | Rover Petroleum Operating, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Dec 2025 |
| 21 | Royal American Oil & Gas | Post, TX 79356 | Oil & Gas Operator | Jan 2019 |
| 22 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |