| 1 | Ragnar Exploration, LLC | | Oil & Gas Operator | Jan 2025 |
| 2 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 3 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Feb 2025 |
| 4 | RDT Properties, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2012 |
| 5 | Remuda Energy Development LLC | Billings, MT 59104 | Oil & Gas Operator | Jan 2025 |
| 6 | Resolute Natural Resources Co., LLC | Denver, CO 80203 | Oil & Gas Operator | Feb 2017 |
| 7 | Resonance Exploration (North Dakota) LLC | | Oil & Gas Operator | Feb 2025 |
| 8 | Resource Energy Can-Am LLC | | Oil & Gas Operator | May 2022 |
| 9 | Rigel, Inc. | | Oil & Gas Operator | Feb 2010 |
| 10 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Mar 2025 |
| 11 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Dec 2024 |
| 12 | Ritter, Laber & Associates, Inc. | Williston, ND 58802 | Oil & Gas Operator | Oct 2024 |
| 13 | Rocanville Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2016 |
| 14 | Rockport Energy Solutions LLC | Austin, TX 78730 | Oil & Gas Operator | Mar 2025 |
| 15 | Rocky Top Energy LLC | Bartlesville, OK 74003 | Oil & Gas Operator | Sep 2024 |
| 16 | Ronald M. Sannes | | Oil & Gas Operator | Oct 2016 |
| 17 | Ryan Exploration, Inc. | | Oil & Gas Operator | Mar 2012 |