| 1 | R & H Oil & Gas, Inc. | | Oil & Gas Operator | Apr 1992 |
| 2 | R A Nobile | | Oil & Gas Operator | Nov 1989 |
| 3 | R. A. Campbell Company | | Oil & Gas Operator | Nov 1995 |
| 4 | R.A. Campbell & Dale Expl | | Oil Operator | Nov 1995 |
| 5 | Rabb Contracting Company, L.L.C. | | Oil Operator | Nov 2024 |
| 6 | Rabb Resources, Limited | | Oil Operator | Dec 2002 |
| 7 | Radiant Oil & Gas Operating Company, Inc | | Oil & Gas Operator | Aug 2015 |
| 8 | Radzewicz Operating Corp. | | Oil & Gas Operator | Oct 2017 |
| 9 | Ricks & Ricks Oil Producers | | Oil Operator | Sep 1983 |
| 10 | Risher Company, Inc. | | Oil & Gas Operator | Jul 2001 |
| 11 | Robertson Energy, LLC | | Oil & Gas Operator | Dec 2024 |
| 12 | Romaxsco Exploration Co., Inc. | | Oil & Gas Operator | Aug 1993 |
| 13 | Roms Co., Inc. | | Oil Operator | Jun 1983 |
| 14 | Ron Knott & Associates,Inc. | | Oil & Gas Operator | Aug 1989 |
| 15 | Ross Exploration,Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2013 |
| 16 | Ross Prod. - Zwahlen & Raish | | Oil & Gas Operator | Sep 1998 |
| 17 | Ryca Energy Partners LLC | | Oil Operator | Nov 2024 |