| 1 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2024 |
| 2 | H G & G Inc | Edmond, OK 73034 | Oil & Gas Operator | Jan 2006 |
| 3 | H2ox Operating LLC | | Oil Operator | Feb 2024 |
| 4 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 5 | Haken Oil LLC | | Oil Operator | Jan 2024 |
| 6 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
| 7 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 8 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 9 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 10 | Hanoco Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2024 |
| 11 | Harmony Oil LLC | | Oil Operator | Jan 2024 |
| 12 | Harper Joe Howard Dba J H Field Service | | Oil & Gas Operator | Jan 2024 |
| 13 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 14 | Harrison-Wright Oil Company LLC | | Oil & Gas Operator | Jan 2024 |
| 15 | Harter Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 2023 |
| 16 | Hays Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2000 |
| 17 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 18 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 19 | Heath B M | | Oil & Gas Operator | Feb 1994 |
| 20 | Heath Oil Company | Washington, OK 73093-4702 | Oil & Gas Operator | Jan 2024 |
| 21 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 22 | Heritage Oil Company | Norman, OK 73070 | Oil & Gas Operator | Jul 2008 |
| 23 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2024 |
| 24 | High Energy | Cushing, OK 74023-1762 | Oil & Gas Operator | Jan 2024 |
| 25 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 26 | Hightower Energy LLC | | Oil & Gas Operator | Jan 2024 |
| 27 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 28 | Hill Oil Company Inc | | Oil & Gas Operator | Jan 2024 |
| 29 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 30 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | Feb 2024 |
| 31 | HLH Realty Inc | Drumright, OK 74030-0232 | Oil & Gas Operator | Mar 2016 |
| 32 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Jan 2024 |
| 33 | Holloway David A | Okmulgee, OK 74447-9191 | Oil & Gas Operator | Jan 2024 |
| 34 | Holmes Mary Ellen | Bristow, OK 74010 | Oil Operator | Mar 2015 |
| 35 | Hoppes Helen E | Depew, OK 74028-3428 | Oil & Gas Operator | Apr 2015 |
| 36 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 37 | Huntington Energy LLC | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2024 |
| 38 | Hy-Carb Energy Inc | | Oil & Gas Operator | Feb 2009 |
| 39 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |