| 1 | H & M Integrity LLC | Ratliff City, OK 73481-8052 | Oil Operator | Aug 2025 |
| 2 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 3 | Haines Oil Company | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2009 |
| 4 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jul 2025 |
| 5 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 6 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 7 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 8 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 9 | Hays Production LLC | Velma, OK 73491 | Oil & Gas Operator | Aug 2025 |
| 10 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2025 |
| 11 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Aug 2025 |
| 12 | Henry Petroleum Of Oklahoma LP | Midland, TX 79703-5000 | Oil & Gas Operator | Feb 2017 |
| 13 | Hep Oil Company, LTD. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 14 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 15 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 16 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 17 | HMD Oil Co Inc | Ardmore, OK 73401-2542 | Oil & Gas Operator | Sep 2025 |
| 18 | Hoard John L Family Trust | Ardmore, OK 73402-1706 | Oil & Gas Operator | Jun 2022 |
| 19 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Sep 2025 |
| 20 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 21 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 22 | Hooks Dwain | Tatums, OK 73487 | Oil & Gas Operator | Aug 2025 |
| 23 | Horton Mary | Ratliff City, OK 73481 | Oil Operator | May 2020 |
| 24 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Dec 2025 |
| 25 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2025 |
| 26 | Huck Farms LLC | Stratford, OK 74872 | Oil & Gas Operator | Aug 2025 |
| 27 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 28 | Hunton Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 29 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |