| 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 | Rafter T Resources LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 5 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 6 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2025 |
| 7 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 8 | Rayden | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 9 | Reatta Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 10 | Recovery Operating LP | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2025 |
| 11 | Red Oak Energy Co | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2025 |
| 12 | Regal Development Inc. | Eldorado, TX 76936 | Gas Operator | Jul 1996 |
| 13 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 14 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 15 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 16 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 17 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 18 | Rendova Oil Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2002 |
| 19 | Riata Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2006 |
| 20 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Dec 2025 |
| 21 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 22 | Ricks Expl Acquisition LLC | Midland, TX 79701 | Oil & Gas Operator | Aug 2013 |
| 23 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 24 | Ridgeline Energy Inc. | Miami, FL 33130 | Oil & Gas Operator | Dec 2025 |
| 25 | Ridgeline Resources, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 26 | Rio Rocky Enterprises, Inc. | Eldorado, TX 76936 | Oil & Gas Operator | Dec 2025 |
| 27 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 28 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 29 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 30 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 31 | Rodessa Management, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 1995 |
| 32 | Roil Production Company | Houston, TX 77056 | Gas Operator | Sep 2005 |
| 33 | Rumble Energy LLC | Skiatook, OK 74070 | Oil & Gas Operator | Dec 2025 |
| 34 | Russell Operating Company, LLC | Big Lake, TX 76932 | Oil Operator | Dec 2025 |
| 35 | Rust Oil Corp. | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2025 |
| 36 | Ruwco Oil And Gas Corp. | Austin, TX 78701 | Oil & Gas Operator | Aug 2021 |
| 37 | Rwa, LLC | Boyd, TX 76023 | Oil & Gas Operator | Dec 2025 |