| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | R And B Energy Co LLC | Oil Operator | Dec 2011 | |
| 2 | R Cubed L L C | Oil & Gas Operator | Dec 2023 | |
| 3 | R S E C LLC | Oil & Gas Operator | Nov 2002 | |
| 4 | Rainbow Oil And Gas Inc | Oil & Gas Operator | Jun 2016 | |
| 5 | Rampart Energy Co | Oil & Gas Operator | Dec 2025 | |
| 6 | Ranch Production Co | Oil & Gas Operator | Jul 2000 | |
| 7 | Ranch Production LLC | Oil & Gas Operator | Mar 2026 | |
| 8 | Range Michigan LLC | Oil Operator | Dec 2020 | |
| 9 | Range Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2000 |
| 10 | Range Resources Appalachia LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Mar 2026 |
| 11 | Rayburn Oil Co Inc | Oil & Gas Operator | Dec 2025 | |
| 12 | Red Rock Resources Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Apr 2026 |
| 13 | Reef Petroleum Corp | Oil & Gas Operator | Feb 1994 | |
| 14 | Reefworks LLC | Oil & Gas Operator | Feb 2026 | |
| 15 | Reservoir Research Corp | Oil Operator | Dec 2009 | |
| 16 | Richter Ervin E | Oil & Gas Operator | Dec 2009 | |
| 17 | Riley Leo M Co | Gas Operator | Oct 1998 | |
| 18 | Riverside Energy Michigan LLC | Oil & Gas Operator | Mar 2026 | |
| 19 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 20 | Rosekrans Janet A Dba J Oil Co | Oil & Gas Operator | Jan 2003 | |
| 21 | Rovsek Adolph E | Oil & Gas Operator | Oct 1991 |