| 1 | R & D Operating | Early, TX 76803 | Oil & Gas Operator | Mar 2008 |
| 2 | R & D Operating, Inc. | Early, TX 76802 | Oil & Gas Operator | Oct 2025 |
| 3 | R & L Producing Co., Inc. | Hamilton, TX 76531 | Oil & Gas Operator | Nov 1997 |
| 4 | R R Operation Inc | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2004 |
| 5 | Ranger Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 6 | Reach Oil | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2025 |
| 7 | Red-Tex Petroleum, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 8 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Oct 2025 |
| 9 | Rhodes Drilling Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2000 |
| 10 | Riata Energy Inc | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2008 |
| 11 | Rice Drilling Company | Santa Anna, TX 76878 | Oil & Gas Operator | Oct 2025 |
| 12 | Rice, James D. | Santa Anna, TX 76878 | Oil & Gas Operator | Sep 2007 |
| 13 | Richey Operating, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 14 | Richey, Ray Management Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Oct 2025 |
| 15 | Richmond Operating Company | Midland, TX 79707 | Oil & Gas Operator | Feb 2007 |
| 16 | Rico Oil Company | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 17 | Ridge Oil Company | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 18 | Rimfire Resources, LLC | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 19 | Ringo Rig LLC | Coleman, TX 76834 | Oil & Gas Operator | Oct 2025 |
| 20 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 21 | Roaring Springs Energy, LTD. | Midland, TX 79702 | Oil & Gas Operator | Feb 2010 |
| 22 | Robertson, T. L. Operating Co. | Cross Plains, TX 76443 | Oil & Gas Operator | May 2004 |
| 23 | Rocker A Operating Company | Post, TX 79356 | Oil & Gas Operator | Aug 2022 |
| 24 | Roco Petroleum, Incorporated | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 25 | Rod, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Mar 2008 |
| 26 | Rodman Petroleum Corp. | Odessa, TX 79768 | Oil & Gas Operator | Jul 2023 |
| 27 | Ross Engineering, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Oct 2025 |
| 28 | Rough Creek Exploration, Inc. | Santa Anna, TX 76878 | Oil & Gas Operator | Jan 1996 |