| 1 | R. K. G. Engineering, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2025 |
| 2 | R.C.I. Energy | Alice, TX 78333 | Oil & Gas Operator | Apr 2025 |
| 3 | Radius Operating, LLC | Round Rock, TX 78664 | Oil & Gas Operator | Apr 2025 |
| 4 | Raker Resources LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2025 |
| 5 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2025 |
| 6 | Rancho Blanco Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1995 |
| 7 | Red Water Resources, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Apr 2025 |
| 8 | Reddy Disposals, LLC | Beeville, TX 78104 | Oil Operator | Apr 2025 |
| 9 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Apr 2025 |
| 10 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Apr 2025 |
| 11 | Rego Development Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2002 |
| 12 | Reh Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2025 |
| 13 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Apr 2025 |
| 14 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 15 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Apr 2025 |
| 16 | Resource Management Company | Fredericksbrg, TX 78624 | Oil & Gas Operator | Feb 2015 |
| 17 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 18 | Ricochet Energy, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2025 |
| 19 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 20 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Apr 2025 |
| 21 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Apr 2025 |
| 22 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 23 | Rio Grand Exploration, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2025 |
| 24 | Rio Grande E&P II, LLC | Houston, TX 77092 | Gas Operator | Apr 2025 |
| 25 | Rio Grande E&P, LLC | Houston, TX 77024 | Gas Operator | May 2022 |
| 26 | Rio Grande Energy | Laredo, TX 78041 | Oil & Gas Operator | May 2004 |
| 27 | Ritter Properties, LTD. | Fredericksbrg, TX 78624 | Oil & Gas Operator | Apr 2025 |
| 28 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 29 | Robertson Resources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2025 |
| 30 | Robison, J. H. & Assoc. LTD. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 1996 |
| 31 | Rockdale Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2020 |
| 32 | Rockford Energy Partners II, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2007 |
| 33 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 34 | Ronde Operating, LLC | Houston, TX 77006 | Oil & Gas Operator | Mar 2021 |
| 35 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2025 |
| 36 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 37 | Rowden Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2023 |
| 38 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 39 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2025 |
| 40 | RWJ Operating LLC | Dallas, TX 75201 | Oil & Gas Operator | Apr 2025 |
| 41 | Rystin Oil & Gas | Sugar Land, TX 77487 | Oil & Gas Operator | Apr 2025 |