| 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 | Oct 2025 |
| 3 | R.K.G. Operations, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Jun 2004 |
| 4 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 5 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2025 |
| 6 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 7 | Ranger 40 Petroleum, LLC | Fairfield, CT 06824 | Oil & Gas Operator | Oct 2025 |
| 8 | Raptor Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 9 | Rasmussen, Hal J. Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 2009 |
| 10 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 11 | Rattler Midstream Operating LLC | Midland, TX 79701 | Oil Operator | Oct 2025 |
| 12 | Raven Resources LLC | Oklahoma City, OK 73172 | Oil & Gas Operator | Jun 2025 |
| 13 | Raw Oil & Gas, Inc. | Lubbock, TX 79401 | Oil & Gas Operator | Oct 2025 |
| 14 | Rawls Oil Services | Andrews, TX 79714 | Oil Operator | Oct 2025 |
| 15 | RBJ & Associates, LP | Midland, TX 79707 | Oil Operator | Jan 2020 |
| 16 | Redco Oil & Gas, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Oct 2025 |
| 17 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Oct 2025 |
| 18 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 19 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 20 | Remuda Operating Company | Midland, TX 79711 | Oil & Gas Operator | Oct 2025 |
| 21 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Oct 2025 |
| 22 | Resource Operating Company | Abilene, TX 79601 | Oil & Gas Operator | Jul 1997 |
| 23 | Reverence Operating LLC | Odessa, TX 79768 | Oil & Gas Operator | Oct 2025 |
| 24 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 25 | RGX Energy LLC | Plano, TX 75025 | Oil & Gas Operator | Oct 2019 |
| 26 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 27 | Richmond Drilling Company | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 28 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Oct 2025 |
| 29 | Ring Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 30 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 31 | Rising Star Energy, L.L.C. | Dallas, TX 75219 | Oil & Gas Operator | Aug 2006 |
| 32 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Oct 2025 |
| 33 | Ronning Gas And Oil LLC | Mesa, AZ 85203 | Oil & Gas Operator | Oct 2025 |
| 34 | Rover Petroleum Operating, LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Oct 2025 |
| 35 | Roy Jackson Energy Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 36 | Royale Operating Company | San Diego, CA 92108 | Oil & Gas Operator | Apr 1996 |
| 37 | RSP Permian, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2018 |
| 38 | Rumble Energy LLC | Skiatook, OK 74070 | Oil & Gas Operator | Oct 2025 |
| 39 | Rusk Co. Well Service Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 40 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | Oct 2025 |
| 41 | Rust Operating Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Feb 2000 |
| 42 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |
| 43 | Ryann Operating, LLC | Waller, TX 77484 | Oil & Gas Operator | Oct 2025 |