| 1 | R K Petroleum Corp. | Midland, TX 79708 | Oil & Gas Operator | May 2024 |
| 2 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 3 | Ram Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2012 |
| 4 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 5 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2025 |
| 6 | Rand - Paulson Oil Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Feb 1999 |
| 7 | Rand Energy Company | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 8 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 9 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2025 |
| 10 | Raw Oil & Gas, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2025 |
| 11 | Red Tail Exploration, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 12 | Regency Petroleum Co. | Irving, TX 75016 | Oil & Gas Operator | Aug 2002 |
| 13 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 14 | Remnant Oil Operating, LLC | Midland, TX 79704 | Oil & Gas Operator | Jul 2024 |
| 15 | Ricks Expl Acquisition Corp | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2004 |
| 16 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 17 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 18 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2025 |
| 19 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 20 | Roc Operating, Inc. | Plano, TX 75093 | Oil & Gas Operator | Oct 2008 |
| 21 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 22 | Roca Resource Company, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 23 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 24 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 25 | Rogers, S. K. Oil, Inc. | Lubbock, TX 79424 | Oil & Gas Operator | Dec 2025 |
| 26 | Rollo Resources, LLC | Granbury, TX 76049 | Gas Operator | Dec 2025 |
| 27 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |