| 1 | R & F Land Co., Inc. | | Oil & Gas Operator | Jan 2000 |
| 2 | R H Energy Co Inc | | Oil & Gas Operator | Sep 1989 |
| 3 | R360 Environmental Solutions Of La, LLC | | Oil Operator | Jan 2025 |
| 4 | Ralph L. Leaderbrand | | Oil & Gas Operator | Dec 1996 |
| 5 | Rauch, Shaw & Laird, Inc. | | Oil & Gas Operator | Mar 1995 |
| 6 | Rauch-Shaw Assoc. Inc. & Laird | | Oil & Gas Operator | Mar 1991 |
| 7 | Raybo, Inc. | | Oil Operator | Dec 1990 |
| 8 | Red River Oil & Gas Inc. | | Oil & Gas Operator | May 2012 |
| 9 | Regency Field Services LLC | Dallas, TX 75201 | Oil Operator | Jul 2017 |
| 10 | Regency Intrastate Gas LLC | | Oil Operator | Feb 2009 |
| 11 | Reliant Energy Field SVS Inc. | | Oil Operator | Sep 2002 |
| 12 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 13 | Riverstone Energy Operating, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2026 |
| 14 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 15 | Roberson Farm Equipment, Inc. | | Oil Operator | Mar 1989 |
| 16 | Rocky Mount Gas Gathering,LLC | | Oil Operator | Apr 2001 |
| 17 | Rosbottom Production Corp | Shreveport, LA 71134 | Oil & Gas Operator | Dec 2017 |
| 18 | Rosewood Resources (Poc), Inc. | | Oil & Gas Operator | Dec 1984 |
| 19 | Rosewood Resources Inc | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |