| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | R S E C LLC | Oil & Gas Operator | Nov 2002 | |
| 2 | Reef Petroleum Corp | Oil & Gas Operator | Feb 1994 | |
| 3 | Reefworks LLC | Oil & Gas Operator | Aug 2025 | |
| 4 | Riverside Energy Michigan LLC | Oil & Gas Operator | Jul 2025 | |
| 5 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 6 | Rovsek Adolph E | Oil & Gas Operator | Oct 1991 |