| 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 | Jun 2025 |
| 3 | Rafter T Resources LLC | Midland, TX 79705 | Oil & Gas Operator | Jun 2025 |
| 4 | Ram Energy LLC | Tulsa, OK 74152 | Oil & Gas Operator | Feb 2025 |
| 5 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jun 2025 |
| 6 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 7 | Rangeland Exploration Company | Midland, TX 79702 | Oil & Gas Operator | Aug 1995 |
| 8 | Rangeland Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Apr 2002 |
| 9 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Jun 2025 |
| 10 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 11 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 12 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 13 | Redwood Oil & Gas | McKinney, TX 75070 | Oil & Gas Operator | Apr 2013 |
| 14 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Jun 2025 |
| 15 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 16 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 17 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 18 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Jun 2025 |
| 19 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 20 | Richmond Drilling Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 21 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Jun 2025 |
| 22 | Rio Oil And Gas (Permian) II,LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Nov 2024 |
| 23 | Rivercity Operating, Inc. | Austin, TX 78766 | Oil & Gas Operator | Jun 2025 |
| 24 | RMB Operating LLC | Lubbock, TX 79493 | Oil & Gas Operator | Jun 2025 |
| 25 | RMC Petroleum, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 1996 |
| 26 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 27 | Roberts & Hammack, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2025 |
| 28 | Robertson Resources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Jun 2025 |
| 29 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 30 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 31 | Rover Petroleum Operating, LLC | Plano, TX 75075 | Oil & Gas Operator | Jun 2025 |
| 32 | Royalty Land & Dev. Co., Inc. | Wolfforth, TX 79382 | Oil & Gas Operator | Jun 2025 |
| 33 | RP Operating, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 34 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 35 | Ruwco Oil And Gas Corp. | Austin, TX 78701 | Oil & Gas Operator | Aug 2021 |
| 36 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Jun 2025 |