| 1 | R & H LLC | Ardmore, OK 73401-6329 | Oil & Gas Operator | Mar 2015 |
| 2 | R & N Associates | Grapevine, TX 76051 | Oil & Gas Operator | Feb 2025 |
| 3 | R & N Oil Company | Fairfax, OK 74637 | Oil & Gas Operator | May 2013 |
| 4 | R C Taylor Operating Company LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | May 2025 |
| 5 | Ra-Jac LLC | Norman, OK 73072 | Oil & Gas Operator | May 2025 |
| 6 | Rainbo Service Company | Oklahoma City, OK 73129 | Oil & Gas Operator | Apr 2025 |
| 7 | Rainbow Oilwell Service Inc | Depew, OK 74028 | Oil & Gas Operator | Jul 2024 |
| 8 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 9 | Ramhead Petroleum Inc | Seminole, OK 74818-0848 | Oil & Gas Operator | Aug 2008 |
| 10 | Ramsey Engineering Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 1993 |
| 11 | Ramsey Nichols Operating Company LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | May 2025 |
| 12 | Ramsey Property Management LLC | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Apr 2025 |
| 13 | Ramsey Property MGMT Inc | Oklahoma City, OK 73120-1955 | Oil & Gas Operator | Mar 2019 |
| 14 | Rapp Oil & Gas | Oklahoma City, OK 73120 | Gas Operator | Jul 2020 |
| 15 | Red Hawk Resources Inc | Edmond, OK 73003-3207 | Oil & Gas Operator | May 2025 |
| 16 | Redhen Oil Company | Oklahoma City, OK 73135 | Oil & Gas Operator | Sep 2024 |
| 17 | Reed Power Tongs Inc | Seminole, OK 74818 | Oil & Gas Operator | Mar 2025 |
| 18 | Reserve Exploration Co. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2007 |
| 19 | Revelation Gas & Oil Oklahoma LLC | Kansas City, KS 66103 | Oil & Gas Operator | Jul 2023 |
| 20 | Revelation Resources | Cypress, TX 77410-2578 | Oil & Gas Operator | Apr 2025 |
| 21 | Revere Corporation | Fort Smith, AR 72902-0908 | Oil & Gas Operator | Feb 2015 |
| 22 | Revolution Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Jun 2023 |
| 23 | Rhoades Oil Co | Tulsa, OK 74136-5575 | Oil & Gas Operator | Aug 2013 |
| 24 | Ric Petroleum, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2003 |
| 25 | Rife Oil Properties Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 26 | Rio Blanco Operating LLC | Victoria, TX 77904 | Oil & Gas Operator | Apr 2025 |
| 27 | Riviera Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 28 | RKK Production Company | Mustang, OK 73064 | Oil & Gas Operator | May 2025 |
| 29 | Roka Management Inc | Oklahoma City, OK 73139 | Oil & Gas Operator | Apr 2025 |
| 30 | Roka Resources Inc | Oklahoma City, OK 73139 | Oil & Gas Operator | Mar 2025 |
| 31 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | Jul 2025 |
| 32 | Rough Rider Oil LLC | Booker, TX 79005-0427 | Oil & Gas Operator | May 2025 |
| 33 | Rox Exploration Inc | Norman, OK 73069-6301 | Oil & Gas Operator | May 2025 |
| 34 | Royalty Energy Development LLC | Edmond, OK 73003 | Oil & Gas Operator | May 2025 |
| 35 | Rupe Oil Company, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Mar 2025 |