| 1 | R&F Operating Company | Carthage, TX 75633 | Oil Operator | Apr 2024 |
| 2 | Red Rock Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2015 |
| 3 | Regent Oil & Gas Company, L.P. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2006 |
| 4 | Reichmann Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Apr 2024 |
| 5 | Reynolds Drilling Co., Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Apr 2024 |
| 6 | Rfe Operating, LLC | Tyler, TX 75703 | Oil & Gas Operator | Apr 2024 |
| 7 | Richman Petroleum Corp. | Grapevine, TX 76051 | Oil & Gas Operator | Jul 2006 |
| 8 | Riverstone Energy Operating, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2024 |
| 9 | RLM Energy Company Inc. | Monroe, LA 71201 | Oil & Gas Operator | Mar 2008 |
| 10 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 11 | Rockcliff Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 12 | Roosth Production Co. | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 13 | Rosbottom Production Corp | Shreveport, LA 71134 | Oil & Gas Operator | Dec 2017 |
| 14 | Rosetta Energy Partners, L P | Dallas, TX 75219 | Oil & Gas Operator | Jul 2009 |
| 15 | Ross Production Co. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 16 | Rudman Partnership, The | Dallas, TX 75201 | Oil & Gas Operator | Dec 2014 |