| 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 | R.K.G. Operations, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Jun 2004 |
| 4 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 5 | Raider Oil & Gas Company | MC Camey, TX 79752 | Oil & Gas Operator | Dec 2025 |
| 6 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 7 | Ranger 40 Petroleum, LLC | Fairfield, CT 06824 | Oil & Gas Operator | Dec 2025 |
| 8 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Dec 2025 |
| 9 | Rayden | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 10 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 11 | Regions Energy LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2016 |
| 12 | Regions Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2024 |
| 13 | Rein Pusher Operating LLC | Brenham, TX 77834 | Oil & Gas Operator | Dec 2025 |
| 14 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 15 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 16 | Rendova Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2002 |
| 17 | Reverence Operating LLC | Odessa, TX 79768 | Oil & Gas Operator | Dec 2025 |
| 18 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 19 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 20 | Riata Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2006 |
| 21 | Richey Properties, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 22 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 23 | Rittenhouse Oil & Gas Co. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 24 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 25 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 26 | Roc Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2013 |
| 27 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 28 | Rock Well Petroleum (U.S.), Inc. | Canada, 00100 | Oil & Gas Operator | Sep 2014 |
| 29 | Rockport Energy Solutions LLC | Austin, TX 78730 | Oil & Gas Operator | Dec 2025 |
| 30 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 31 | Rogers, M. L. | Midland, TX 79701 | Oil & Gas Operator | Sep 2014 |
| 32 | RP Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 33 | RRP Operating LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |