| 1 | R & A Oil, Inc. | Billings, MT 59105 | Oil & Gas Operator | Jul 2025 |
| 2 | R & B Energy, LLC | Shelby, MT 59474 | Oil Operator | Jul 2025 |
| 3 | R & J Production, Inc. | Laurel, MT 59044 | Oil Operator | Mar 2006 |
| 4 | R & N Associates,Etal Glen Neubert, Agent | Dallas, TX 75244-5100 | Oil Operator | Sep 2005 |
| 5 | R.C.S. Oil, Inc. | Valier, MT 59486 | Oil Operator | Jul 2025 |
| 6 | R3 Operating Corporation | Denver, CO 80222 | Oil & Gas Operator | Nov 2025 |
| 7 | Ramhorn Energy, LLC | Green River, WY 82935 | Oil & Gas Operator | Sep 2025 |
| 8 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Oct 2025 |
| 9 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2025 |
| 10 | Rankin, Paul | Bridgeville, PA 15017 | Oil & Gas Operator | Jun 2016 |
| 11 | Redstone Gas Partners LLC | Denver, CO 80202 | Gas Operator | Mar 2001 |
| 12 | Remuda Energy Development LLC | Billings, MT 59104 | Oil & Gas Operator | Sep 2025 |
| 13 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Nov 2025 |
| 14 | Retamco Operating Inc | Red Lodge, MT 59068 | Oil & Gas Operator | Sep 2025 |
| 15 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Sep 2025 |
| 16 | Ridge Oil & Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Sep 2025 |
| 17 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Nov 2025 |
| 18 | Rimrock Colony | Sunburst, MT 59482 | Gas Operator | Aug 2025 |
| 19 | Rimrock Oil Company | Kalispell, MT 59901 | Oil & Gas Operator | Dec 2023 |
| 20 | Rincon Oil & Gas LLC | Arvada, CO 80005 | Gas Operator | Jun 2022 |
| 21 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jun 2025 |
| 22 | Ritter, Laber & Associates, Inc. | Williston, ND 58802 | Oil & Gas Operator | Aug 2025 |
| 23 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 24 | Robert Hawkins Inc | Kevin, MT 59454 | Oil & Gas Operator | Sep 2025 |
| 25 | Robinson Oil Company, LLC | Billings, MT 59103 | Gas Operator | Dec 2015 |
| 26 | Rock Creek Oil, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Nov 2019 |
| 27 | Rocky Mountain Operating Co Inc | Littleton, CO 80121 | Oil & Gas Operator | Dec 2011 |
| 28 | Roland Oil And Gas | Cut Bank, MT 59427 | Oil Operator | Feb 2023 |
| 29 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Nov 2025 |