| 1 | Rampart Petroleum, Incorporated | Buffalo Gap, TX 79508 | Oil & Gas Operator | Jan 2009 |
| 2 | Ratts, Robert V. Inc. | Bedford, TX 76021 | Oil & Gas Operator | Aug 2003 |
| 3 | Ray Herring Estate | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 4 | Ray Herring Operating Co., LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 5 | Rayco Operating, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Apr 2024 |
| 6 | Red-Tex Petroleum, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Aug 2003 |
| 7 | Richardson, Bud II | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 8 | Rister Oil&Gas International LLC | Eastland, TX 76448 | Oil & Gas Operator | Apr 2024 |
| 9 | Rister, Dewey | Avoca, TX 79503 | Oil & Gas Operator | Apr 2024 |
| 10 | RMB Operating LLC | Houston, TX 77269 | Oil & Gas Operator | Apr 2024 |
| 11 | Ro-Jo, Inc. | Highland VLG, TX 75077 | Oil & Gas Operator | Aug 2003 |
| 12 | Robertson Resources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Apr 2024 |
| 13 | Robinson Operating Company | Abilene, TX 79604 | Oil & Gas Operator | Aug 2012 |
| 14 | Roco Petroleum, Incorporated | Abilene, TX 79605 | Oil & Gas Operator | Apr 2024 |
| 15 | Rogers Drilling Co. | Olney, TX 76374 | Oil & Gas Operator | Apr 2024 |
| 16 | Ross, Dwight M. DRLG. Co., Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2024 |
| 17 | Royal Texan Energy Co. | Irvine, CA 92618 | Oil & Gas Operator | Apr 2024 |
| 18 | Royal Texan Resources Co. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2024 |
| 19 | RPM Petroleum, LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Apr 2013 |
| 20 | Rust Oil Corp. | Fort Worth, TX 76108 | Oil & Gas Operator | Apr 2024 |
| 21 | Rust Operating Co., Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Feb 2000 |