| 1 | H & H Oil Productions | Tulsa, OK 74145 | Oil Operator | Jul 1999 |
| 2 | H & W Drilling Inc | Racine, OH 45769 | Oil & Gas Operator | Dec 2023 |
| 3 | H B Oil & Gas Inc | Oklahoma City, OK 73159 | Oil & Gas Operator | Jun 2000 |
| 4 | H R Collier Collier Oil & Gas | | Oil & Gas Operator | Feb 2025 |
| 5 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
| 6 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 7 | Hanover Operating Company | Tulsa, OK 74101 | Oil & Gas Operator | Dec 1998 |
| 8 | Hansen Noel | Avant, OK 74001 | Oil Operator | Aug 2013 |
| 9 | Hard Rock Operating LLC | | Oil & Gas Operator | May 2022 |
| 10 | Harden Operating Company Inc | Tulsa, OK 74106-2722 | Oil & Gas Operator | Sep 2006 |
| 11 | Harold M Root Foundation | | Oil Operator | Feb 2025 |
| 12 | Harrington Billy B | Depew, OK 74028-3495 | Oil & Gas Operator | May 2006 |
| 13 | Harris Mildred C | Tulsa, OK 74120 | Oil & Gas Operator | Feb 2025 |
| 14 | Harris Minerals Corp (The) | Oklahoma City, OK 73162-1045 | Oil & Gas Operator | Mar 2025 |
| 15 | Haught Harold | Hominy, OK 74035 | Oil Operator | Feb 2012 |
| 16 | Hayes & Hudson | Bartlesville, OK 74003 | Oil & Gas Operator | Feb 2025 |
| 17 | Hays Stanley L | Wynola, OK 74084 | Oil Operator | May 2022 |
| 18 | HB Oil Company | Abilene, TX 79602 | Oil & Gas Operator | Jun 2023 |
| 19 | Heller, Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Feb 2025 |
| 20 | Helmco Production Company | Pawhuska, OK 74056 | Oil Operator | Aug 2000 |
| 21 | Helmer Oil Corporation | | Oil & Gas Operator | Feb 2025 |
| 22 | Helmer, Bonnie J | | Oil Operator | Feb 2025 |
| 23 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Feb 2025 |
| 24 | Henley, VIola F | | Oil Operator | Feb 2025 |
| 25 | Henry Rennick | | Oil Operator | Feb 2025 |
| 26 | Herrman & Ikenberry | Cushing, OK 74023-0247 | Oil & Gas Operator | Dec 2003 |
| 27 | Heuston Oil LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 28 | Hewitt, Douglas R | | Oil Operator | Jul 2024 |
| 29 | HGN Operating Co. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 30 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | Mar 2025 |
| 31 | Hillside Resources | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2007 |
| 32 | HMX Investments, Inc. | Katy, TX 77494 | Oil & Gas Operator | Feb 2025 |
| 33 | Hobo Oil & Gas | | Oil & Gas Operator | Aug 2013 |
| 34 | Holloway David A | Okmulgee, OK 74447-9191 | Oil & Gas Operator | Feb 2025 |
| 35 | Holt Andrew L "Mickey" | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2008 |
| 36 | Holt James | Skiatook, OK 74070-0006 | Oil & Gas Operator | Feb 2020 |
| 37 | Horizon Barnsdall Energy Part LTD I Osage Only | | Oil Operator | Feb 2012 |
| 38 | Horn Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Feb 2025 |
| 39 | Horn R L & Sons Drilling | | Oil Operator | Jun 1997 |
| 40 | Horn, Henry L | | Oil Operator | Apr 2009 |
| 41 | Hough Oil And Gas | Hominy, OK 74035 | Oil Operator | Feb 2025 |
| 42 | Howell Jason | Wynona, OK 74084 | Oil Operator | Feb 2025 |
| 43 | Howell'S Well Service, Inc. | | Oil & Gas Operator | Feb 2025 |
| 44 | Hudgens Lester E | Bartlesville, OK 74006-0215 | Oil Operator | Mar 2015 |
| 45 | Hudson Energy LLC | | Oil Operator | Nov 2024 |
| 46 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 47 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 48 | Huitt Joe A Rev Trust | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2009 |
| 49 | Hull Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2021 |
| 50 | Hulse Steve & Frank | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2000 |
| 51 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 52 | Hurd Oil Company | | Oil & Gas Operator | Jun 2015 |
| 53 | Hurricane Energy Corporation | | Oil & Gas Operator | Dec 2000 |
| 54 | Hutton Gas Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 55 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |