| 1 | R & B Oil Company, LLC | Willis, TX 77318 | Oil & Gas Operator | Apr 2026 |
| 2 | Ram Operating Inc. | Browns, IL 62818 | Oil & Gas Operator | Aug 2008 |
| 3 | Ramsower Minerals Corporation | Beeville, TX 78104 | Oil & Gas Operator | Sep 2013 |
| 4 | Redding, Bobby L. | Three Rivers, TX 78071 | Oil & Gas Operator | Mar 2004 |
| 5 | Redstone Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2020 |
| 6 | Reef Exploration, L.P. | Richardson, TX 75080 | Oil & Gas Operator | Apr 2026 |
| 7 | Rego Development Company, Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Apr 2002 |
| 8 | Reh Energy, Inc. | Corpus Christ, TX 78413 | Oil & Gas Operator | Apr 2026 |
| 9 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2026 |
| 10 | Repsol Oil & Gas USA, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Apr 2026 |
| 11 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Apr 2026 |
| 12 | Richard C. Bellows Family Trust | George West, TX 78022 | Oil Operator | Apr 2026 |
| 13 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 14 | Richter Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2007 |
| 15 | Riddle Engineering Corp. | Corpus Christ, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 16 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Apr 2026 |
| 17 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Apr 2026 |
| 18 | Rio Bravo Royalty Co. | Bandera, TX 78003 | Oil & Gas Operator | Aug 2003 |
| 19 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 20 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2026 |
| 21 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 22 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Apr 2026 |
| 23 | Roma Oil And Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2026 |
| 24 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Apr 2026 |
| 25 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 26 | Royal Production Company, Inc. | Corpus Christ, TX 78401 | Oil & Gas Operator | Apr 2026 |
| 27 | Royko Oil Company | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Apr 2026 |
| 28 | RR Ventures Limited Partnership | San Antonio, TX 78239 | Oil & Gas Operator | Apr 2026 |
| 29 | Rse, Inc. | Houston, TX 77077 | Oil & Gas Operator | Sep 2000 |
| 30 | Rutherford Oil Corporation | Houston, TX 77046 | Oil & Gas Operator | Jun 2019 |