| 1 | H2ox Operating LLC | | Oil Operator | Feb 2024 |
| 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 | Nov 2018 |
| 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 73491-0051 | Oil & Gas Operator | Feb 2024 |
| 10 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 11 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2024 |
| 12 | Henderson Fred J | Okmulgee, OK 74447-9204 | Oil & Gas Operator | Feb 2024 |
| 13 | Henry Petroleum Of Oklahoma LP | Midland, TX 79703-5000 | Oil & Gas Operator | Feb 2017 |
| 14 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 15 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 16 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 17 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 18 | Highland Energy Co | Dallas, TX 75201 | Oil & Gas Operator | Jun 1994 |
| 19 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 20 | HMD Oil Co Inc | | Oil & Gas Operator | Feb 2024 |
| 21 | Hoard John L Family Trust | Ardmore, OK 73402-1706 | Oil & Gas Operator | Jun 2022 |
| 22 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Feb 2024 |
| 23 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 24 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 25 | Hooks Dwain | Tatums, OK 73487-0072 | Oil & Gas Operator | Dec 2023 |
| 26 | Horton Mary | Ratliff City, OK 73481-0031 | Oil Operator | May 2020 |
| 27 | HRB Operating Company Inc | Bridgeport, TX 76426 | Oil & Gas Operator | May 2024 |
| 28 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | May 2024 |
| 29 | Huck Farms LLC | | Oil & Gas Operator | Feb 2024 |
| 30 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 31 | Hunton Operating LLC | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | Feb 2024 |
| 32 | Hy-Carb Energy Inc | | Oil & Gas Operator | Feb 2009 |
| 33 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |