| 1 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 2 | Hargraves Elston | Ponca City, OK 74604 | Oil & Gas Operator | Jul 2003 |
| 3 | Hargus Curtis | Macomb, OK 74852-8508 | Oil Operator | May 2017 |
| 4 | Hargus Irrevocable Trust | Tecumseh, OK 74873-0590 | Oil Operator | Apr 2014 |
| 5 | Harold G Raper Family Trust | Mansfield, TX 76063-1667 | Oil Operator | May 2023 |
| 6 | Harp Peggy A | Seminole, OK 74868-2284 | Oil & Gas Operator | Mar 2024 |
| 7 | Harvey A B | Seminole, OK 74868-1724 | Oil Operator | Mar 2015 |
| 8 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 9 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 10 | Heller, Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | May 2025 |
| 11 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 12 | Hembree Alva | Oklahoma City, OK 73151-9145 | Oil & Gas Operator | Jun 2016 |
| 13 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Jun 2025 |
| 14 | Henry Petroleum Inc | Oklahoma City, OK 73162-1757 | Oil & Gas Operator | Sep 2019 |
| 15 | Hiawatha Exploration Company | Oklahoma City, OK 73116-7326 | Oil & Gas Operator | Mar 2009 |
| 16 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 17 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | May 2025 |
| 18 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Jun 2025 |
| 19 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 20 | Hoco Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 21 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Jul 2025 |
| 22 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Jun 2025 |
| 23 | Home-Stake Royalty Corp., The | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2014 |
| 24 | Hotulke Construction LLC | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 25 | HP Operating LLC | Seminole, OK 74868 | Oil Operator | Jun 2025 |
| 26 | Hughes George B | Asher, OK 74826-0165 | Oil & Gas Operator | Mar 2011 |
| 27 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |