| 1 | R & R Well Service | Fort Worth, TX 76120 | Oil & Gas Operator | Jan 2005 |
| 2 | Ramco Operating Company | Tulsa, OK 74135 | Oil & Gas Operator | Jan 1998 |
| 3 | Ranken Energy Corporation | Edmond, OK 73013 | Oil & Gas Operator | Oct 2024 |
| 4 | Reserve Oil & Gas | | Oil & Gas Operator | Feb 1980 |
| 5 | Resource Development Technology LLC | Morrison, CO 80465 | Oil & Gas Operator | Oct 2020 |
| 6 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 7 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Nov 2024 |
| 8 | Reynolds Mining Corp | | Oil & Gas Operator | Aug 1968 |
| 9 | RG Exploration, LLC | Midland, TX 78705 | Oil & Gas Operator | Feb 2020 |
| 10 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Oct 2024 |
| 11 | Rig II LLC | Woods Cross, UT 84087 | Oil & Gas Operator | May 2018 |
| 12 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2024 |
| 13 | Rim Southwest Corp | Farmington, NM 87499-2058 | Oil & Gas Operator | Nov 2024 |
| 14 | Rio Bravo Oil Company | The Woodlands, TX 77381 | Oil & Gas Operator | Feb 2002 |
| 15 | River Gas Corporation | Tuscaloosa, AL 35406-2233 | Gas Operator | Dec 2000 |
| 16 | River Gas Of Utah Inc | Northport, AL 35476 | Gas Operator | Feb 1995 |
| 17 | Road Runner Inc | Park City, UT 84060 | Oil & Gas Operator | Aug 2005 |
| 18 | Robert L Bayless Producer, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 19 | Rockies Standard Oil Company | Provo, UT 84604 | Oil & Gas Operator | Oct 2020 |
| 20 | Roddy Production Company Inc | Farmington, NM 87401 | Oil & Gas Operator | Nov 2024 |
| 21 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 22 | Rose Petroleum (Us), LLC | Parker, CO 80134 | Oil & Gas Operator | Jul 2016 |
| 23 | Rose Petroleum (Utah) LLC | Annapolis, MD 21401 | Oil & Gas Operator | Dec 2024 |
| 24 | Rose, Verl | Spring Creek, NV 89815 | Oil & Gas Operator | Feb 2011 |
| 25 | Roseland Oil & Gas Inc | Rockwall, TX 75087 | Oil & Gas Operator | Feb 2003 |
| 26 | Rosewood Resources, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 27 | Ross Exploration,Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2013 |
| 28 | Royale Energy Inc | San Diego, CA 92108-4518 | Oil & Gas Operator | Nov 2024 |
| 29 | Ruby, Glen Et Al | | Oil & Gas Operator | Dec 1981 |
| 30 | Running Foxes Petroleum Inc. | Centennial, CO 80112 | Oil & Gas Operator | Dec 2024 |