| 1 | R & S Oil Production Co. | Luling, TX 78648 | Oil & Gas Operator | Dec 2024 |
| 2 | R&R Resources Corporation | Houston, TX 77056 | Oil & Gas Operator | Dec 2015 |
| 3 | Rainbow Producing Company | Dallas, TX 75204 | Oil & Gas Operator | Aug 2003 |
| 4 | Ramrod Oil And Gas (U.S.A.) Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2024 |
| 5 | Ramtex Energy LLC | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2024 |
| 6 | Rancho Blanco Corporation | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1995 |
| 7 | Randolph Company, The | Houston, TX 77219 | Oil & Gas Operator | Aug 2003 |
| 8 | Range Production Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2021 |
| 9 | Ratex Energy Inc. | Manchaca, TX 78652 | Oil & Gas Operator | Sep 2002 |
| 10 | Rathburn Land & Devel, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Aug 2003 |
| 11 | RBR Operating, Inc. | Luling, TX 78648 | Oil & Gas Operator | Dec 2024 |
| 12 | Redbud E & P, Inc. | Spring, TX 77379 | Oil & Gas Operator | Dec 2024 |
| 13 | Redwood Energy, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 14 | Regal Petroleum Services | Euless, TX 76039 | Oil & Gas Operator | Aug 2002 |
| 15 | Reo Operating LLC | Austin, TX 78747 | Oil & Gas Operator | Dec 2024 |
| 16 | Republic Resources, LLC. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2024 |
| 17 | Research Exploration, LLC | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2018 |
| 18 | Reserve Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Mar 2008 |
| 19 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Oct 2024 |
| 20 | RHC Energy (USA) LLC | Houston, TX 77027 | Oil Operator | Dec 2024 |
| 21 | Rialto Oil & Gas Corporation | Houston, TX 77098 | Oil & Gas Operator | Oct 2012 |
| 22 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 23 | Riley Exploration Opg Co, LLC | La Grange, TX 78945 | Oil & Gas Operator | Dec 2024 |
| 24 | Riley Exploration, LLC | Blanchard, OK 73010 | Oil & Gas Operator | Dec 2024 |
| 25 | Riley Permian Operating Co, LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Dec 2024 |
| 26 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2024 |
| 27 | Rme Austin Chalk Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2002 |
| 28 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 29 | Rocc Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Apr 2024 |
| 30 | Rocc Operating, LLC | Houston, TX 77084 | Oil & Gas Operator | Dec 2024 |
| 31 | Rockefeller Hughes (USA) LLC | Houston, TX 77027 | Oil & Gas Operator | Jul 2015 |
| 32 | Rod Oil & Gas LTD. | Houston, TX 77261 | Oil & Gas Operator | Jun 1995 |
| 33 | Rodel Oil & Gas Company | Houston, TX 77218 | Oil & Gas Operator | Dec 2024 |
| 34 | Rollert Co., Inc., The | Luling, TX 78648 | Oil & Gas Operator | Nov 2000 |
| 35 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |