| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Rainbow Oil Company | Oil & Gas Operator | Aug 1999 | |
| 2 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 3 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Aug 2025 |
| 4 | Renos Land & Minerals Company | Casper, WY 82601 | Oil & Gas Operator | Oct 2021 |
| 5 | Rex Energy Rockies LLC | State College, PA 16801 | Oil & Gas Operator | May 2013 |
| 6 | Rki Exploration & Production LLC | Tulsa, OK 74172 | Oil & Gas Operator | Oct 2025 |
| 7 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |