| 1 | H L L Inc | Scottsdale, AZ 85251 | Oil & Gas Operator | Jan 2007 |
| 2 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 3 | Haddox Johnny C | Okemah, OK 74859-0254 | Oil Operator | Apr 2020 |
| 4 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 5 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 6 | Hamilton B J | Ada, OK 74820-9404 | Oil & Gas Operator | Sep 1999 |
| 7 | Hamilton K M Oil & Gas Co | Ada, OK 74820 | Oil Operator | Jan 2013 |
| 8 | Hampton Corporation (The) | Norman, OK 73069-5910 | Oil Operator | Jun 2016 |
| 9 | Hardin Productions | Okemah, OK 74859 | Oil & Gas Operator | Dec 2006 |
| 10 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 11 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Jun 2025 |
| 12 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
| 13 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 14 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Jun 2025 |
| 15 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 16 | Henry Billy Or Connie | Okemah, OK 74859-6075 | Oil & Gas Operator | Jul 2021 |
| 17 | Henson Doyle | Okmulgee, OK 74447-4841 | Oil & Gas Operator | Jun 2020 |
| 18 | Henson Terry Dba Daycon Exploration | Tulsa, OK 74137-3546 | Oil & Gas Operator | Jun 2025 |
| 19 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 20 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Oct 2025 |
| 21 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Jun 2025 |
| 22 | Himco Oil & Gas, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 23 | Hinson Bobbie L | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 24 | Hinson Jr Bobbie L | Bristow, OK 74010 | Oil & Gas Operator | Jul 2020 |
| 25 | Hispanic Oil & Gas Energy, LLC | Houston, TX 77056 | Oil Operator | May 2025 |
| 26 | Holloway David A | Okmulgee, OK 74447-9191 | Oil & Gas Operator | Jun 2025 |
| 27 | Holman Kendall | Paden, OK 74860-7116 | Oil & Gas Operator | Jun 2025 |
| 28 | Holman Ray | Okemah, OK 74859-0029 | Gas Operator | May 2024 |
| 29 | Holman Robert W | Prague, OK 74864-9230 | Oil & Gas Operator | Jan 2019 |
| 30 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 31 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 32 | Horizon Resources Inc | Fort Worth, TX 76101-1978 | Oil & Gas Operator | Jul 2006 |
| 33 | Horn Eddie L Dba B & E Investments | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 34 | Horseshoe Oil Co | Cromwell, OK 74837 | Oil & Gas Operator | Dec 2021 |
| 35 | Howco Oil And Gas | Stroud, OK 74079-9604 | Oil & Gas Operator | Mar 2015 |
| 36 | Howell Bill J | Calvin, OK 74531-0248 | Oil & Gas Operator | Sep 2016 |
| 37 | Huck Farms LLC | Stratford, OK 74872 | Oil & Gas Operator | Jun 2025 |
| 38 | Hull Enterprises Inc | Broken Arrow, OK 74012 | Oil & Gas Operator | Sep 2023 |
| 39 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 40 | Hutton Gas Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 41 | Hydrocarbon Technology Services | | Oil & Gas Operator | Dec 2000 |