| 301 | Hudgens Lester E | Bartlesville, OK 74006-0215 | Oil Operator | Mar 2015 |
| 302 | Hudson Energy LLC | | Oil Operator | Dec 2025 |
| 303 | Hughes Drilling Co Inc | Enid, OK 73702 | Oil & Gas Operator | Apr 1998 |
| 304 | Hughes Gas Systems LLC | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2026 |
| 305 | Hughes George B | Asher, OK 74826-0165 | Oil & Gas Operator | Mar 2011 |
| 306 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 307 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 308 | Huitt Joe A Rev Trust | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2009 |
| 309 | Hulen Operating Company | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2026 |
| 310 | Hull Enterprises Inc | Broken Arrow, OK 74012 | Oil & Gas Operator | Sep 2023 |
| 311 | Hull Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2021 |
| 312 | Hulse Steve & Frank | Pawhuska, OK 74056 | Oil & Gas Operator | Aug 2000 |
| 313 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 314 | Humphrey Mark | Morris, OK 74445-2816 | Oil & Gas Operator | Sep 2021 |
| 315 | Hungerford Oil & Gas Inc | Helena, OK 73741 | Oil & Gas Operator | Nov 2000 |
| 316 | Hunt Brothers Producing Co Inc | Redding, CA 96049-2516 | Oil & Gas Operator | Sep 2012 |
| 317 | Hunt Chris Water Hauling Contractor Inc | Keyes, OK 73947-0004 | Oil Operator | Jun 2008 |
| 318 | Hunt Energy Corporation | | Oil & Gas Operator | Feb 2002 |
| 319 | Hunt Engineering Inc | Norman, OK 73069-4093 | Oil & Gas Operator | Feb 2019 |
| 320 | Hunt H L | Dallas, TX 75202-2785 | Oil & Gas Operator | Jan 2025 |
| 321 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2026 |
| 322 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 323 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | May 2026 |
| 324 | Huntington Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2006 |
| 325 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 326 | Hunton Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 327 | Hurd Oil Company | | Oil & Gas Operator | Jun 2015 |
| 328 | Hurley Charles B | Santa Ana, CA 92706 | Oil & Gas Operator | Apr 2015 |
| 329 | Hurricane Energy Corporation | | Oil & Gas Operator | Dec 2000 |
| 330 | Hurst Oil Investments Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Feb 2015 |
| 331 | Husky Petroleum | Seminole, OK 74818-1181 | Oil Operator | Feb 2012 |
| 332 | Husky Ventures Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Jan 2026 |
| 333 | Hutton Gas Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 334 | Hux Oil Company LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Feb 2026 |
| 335 | Hyalite Energy Corporation | Pampa, TX 79066 | Oil & Gas Operator | Jan 2026 |
| 336 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |
| 337 | Hydrocarbon Technology Services | | Oil & Gas Operator | Dec 2000 |
| 338 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 339 | Hyperion Oil & Gas LLC | Dallas, TX 75251 | Oil & Gas Operator | May 2026 |