| 1 | R-A-R Interests | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2003 |
| 2 | R.C.I. Energy | Alice, TX 78333 | Oil & Gas Operator | Oct 2025 |
| 3 | Ragars Oil & Gas Co. | Austin, TX 78716 | Oil & Gas Operator | Oct 2025 |
| 4 | Ram Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2012 |
| 5 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 6 | Ranger Oil Company | Canada, 00100 | Oil & Gas Operator | Sep 2001 |
| 7 | Rattlesnake Operating Co, LLC | Plntersville, TX 77363 | Oil & Gas Operator | Oct 2025 |
| 8 | RBT Oil Group, LLC | Houston, TX 77043 | Oil Operator | Oct 2025 |
| 9 | Redman Operating Company | Houston, TX 77042 | Oil & Gas Operator | May 2008 |
| 10 | Redwood Operating, Inc. | Houston, TX 77058 | Oil & Gas Operator | Oct 2025 |
| 11 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 12 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Oct 2025 |
| 13 | Remora Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Oct 2025 |
| 14 | Reneau, James Seed Co. | Shamrock, TX 79079 | Oil & Gas Operator | Oct 2025 |
| 15 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Oct 2025 |
| 16 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Oct 2025 |
| 17 | Resaca Resources, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 18 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Oct 2025 |
| 19 | Ress Production Co. | Farmington, NM 87499 | Oil & Gas Operator | Oct 2025 |
| 20 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Jul 2025 |
| 21 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 22 | Richter Operating Company | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2007 |
| 23 | Ricks Exploration, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 24 | Riddle Engineering Corp. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2011 |
| 25 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 26 | Riley Exploration Opg Co, LLC | La Grange, TX 78945 | Oil & Gas Operator | Oct 2025 |
| 27 | Rincon Petroleum Corporation | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2025 |
| 28 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 29 | Rio Exploration Company | San Antonio, TX 78209 | Gas Operator | Dec 2005 |
| 30 | Rio-Tex, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2025 |
| 31 | Rise Petroleum Investments LLC | Tomball, TX 77377 | Oil & Gas Operator | Oct 2025 |
| 32 | Riseden Services, Inc. | Houston, TX 77256 | Oil & Gas Operator | Sep 1997 |
| 33 | RMR Operating, LLC | Plano, TX 75024 | Oil & Gas Operator | Oct 2025 |
| 34 | Robison, J. H. & Assoc. LTD. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 1996 |
| 35 | Roc Operating, Inc. | Plano, TX 75093 | Oil & Gas Operator | Oct 2008 |
| 36 | Rock Resources, Inc. | Corpus Chrsti, TX 78414 | Oil & Gas Operator | Oct 2025 |
| 37 | Rockdale Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2020 |
| 38 | Rocksprings Energy Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 1997 |
| 39 | Rockwell Energy, LLC | Spring, TX 77386 | Oil & Gas Operator | Sep 2014 |
| 40 | Rodel Oil & Gas Company | Houston, TX 77218 | Oil & Gas Operator | Oct 2025 |
| 41 | Rodessa Operating Company | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Oct 2025 |
| 42 | Roma Oil And Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 43 | Ronde Operating, LLC | Houston, TX 77006 | Oil & Gas Operator | Mar 2021 |
| 44 | Rosenthal, Stanley H. | Bay City, TX 77404 | Oil & Gas Operator | Dec 2020 |
| 45 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 46 | Rowden Oil & Gas, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2023 |
| 47 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 48 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 49 | Royko Oil Company | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Oct 2025 |
| 50 | Rto Operating, LLC | San Antonio, TX 78212 | Oil Operator | Feb 2016 |
| 51 | Rystin Oil & Gas | Sugar Land, TX 77487 | Oil & Gas Operator | Oct 2025 |