| 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 | R.K.G. Operations, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Jun 2004 |
| 4 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Dec 2025 |
| 5 | Raider Oil & Gas Company | MC Camey, TX 79752 | Oil & Gas Operator | Dec 2025 |
| 6 | Rampart Petroleum, Incorporated | Buffalo Gap, TX 79508 | Oil & Gas Operator | Jan 2009 |
| 7 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2025 |
| 8 | Raptor Resources, Inc. | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 9 | Rasmussen, Tom | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2025 |
| 10 | Rayden | Midland, TX 79711 | Oil & Gas Operator | Dec 2025 |
| 11 | Red Oak Energy Co | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2025 |
| 12 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 13 | Reliance Energy, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 14 | Reliance Operating Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2000 |
| 15 | Remo, Inc. | Odessa, TX 79760 | Oil & Gas Operator | May 2003 |
| 16 | Renaud Oil Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 17 | Resaca Operating Company | Houston, TX 77010 | Oil & Gas Operator | Sep 2013 |
| 18 | Rex Energy Operating Corp. | State College, PA 16801 | Oil & Gas Operator | Jun 2012 |
| 19 | Rhombus Operating Co., LTD | Littleton, CO 80160 | Oil & Gas Operator | Oct 2025 |
| 20 | Rhonda Operating Company | Midland, TX 79710 | Oil & Gas Operator | Aug 2017 |
| 21 | Riata Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2006 |
| 22 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 23 | Richland Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2025 |
| 24 | Riley Production, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2012 |
| 25 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 26 | Ring Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 27 | Robertson Resources, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2025 |
| 28 | Roca Operating, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 29 | Roden Oil Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2008 |
| 30 | Romine Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 31 | Royalty Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 32 | Rust Oil Corp. | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2025 |