| 201 | Haffner Dan | Hoxie, KS 67740 | Oil Operator | Jun 2025 |
| 202 | Haffner Poor Farms, LLC | Hoxie, KS 67740 | Oil Operator | May 2025 |
| 203 | Hagan, IVan - All-Kin Oil Co | | Oil Operator | Dec 2023 |
| 204 | Hager Gas Co | Danville, WV 25053 | Gas Operator | Dec 2010 |
| 205 | Haggard Operating Group/Oil | Atascosa, TX 78002 | Oil & Gas Operator | Dec 2025 |
| 206 | Haggard, E. A. | Graham, TX 76450 | Oil & Gas Operator | Apr 2001 |
| 207 | Hagler William N | Farmington, NM 87499-0035 | Oil Operator | Apr 2014 |
| 208 | Hahn Kahle E | Knox, PA 16232-4311 | Oil & Gas Operator | Dec 2003 |
| 209 | Haider Operating, LLC | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 210 | Haigood & Campbell | Archer City, TX 76351 | Oil & Gas Operator | Dec 2025 |
| 211 | Haigood, Danny | Portland, TX 78374 | Oil & Gas Operator | Mar 2008 |
| 212 | Hail Petroleum Corporation | Garland, TX 75047-5036 | Oil Operator | Mar 1997 |
| 213 | Haile Petroleum LTD | Artesia, NM 882110186 | Oil & Gas Operator | Aug 2000 |
| 214 | Haile, Guy W. | Sterling, KS 67579 | Oil Operator | Jun 2025 |
| 215 | Hailey Energy Corporation | Wesson, MS 39191 | Gas Operator | May 2013 |
| 216 | Haimo Oil & Gas LLC | Houston, TX 77042 | Oil & Gas Operator | Aug 2020 |
| 217 | Haines Oil Company | Sulphur, OK 73086 | Oil & Gas Operator | Oct 2009 |
| 218 | Hair, Roger D. | Post, TX 79356 | Oil & Gas Operator | Dec 2025 |
| 219 | Haischer James W Dba Haischer James W And Assoc | | Oil & Gas Operator | Dec 2001 |
| 220 | Hal J Rasmussen Oper Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2014 |
| 221 | Hal Oil & Gas Co., Inc. | | Oil & Gas Operator | Apr 1993 |
| 222 | Haland Operating Company, LLC | | Oil & Gas Operator | Jul 2018 |
| 223 | Halbouty, Michel T. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 224 | Halbouty-Reserve | | Oil & Gas Operator | Sep 1987 |
| 225 | Halbouty-Reserve-Pel-Tex | | Oil & Gas Operator | May 1985 |
| 226 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Jul 2025 |
| 227 | Halcon Louisiana Operating, LP | | Oil & Gas Operator | Sep 2017 |
| 228 | Halcon Operating Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 229 | Halcon Opr Co Inc | Houston, TX 77002-5005 | Oil & Gas Operator | Jul 2017 |
| 230 | Halcon Resources Operating, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Dec 2013 |
| 231 | Halcyon Natural Gas LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Jun 2025 |
| 232 | Halde Oil Inc | | Oil & Gas Operator | Sep 2025 |
| 233 | Hale John H | Tulsa, OK 74107 | Oil & Gas Operator | Mar 2000 |
| 234 | Hale Oil | | Oil & Gas Operator | Dec 2024 |
| 235 | Hale Oil & Gas Properties | Graham, TX 76450 | Oil & Gas Operator | Jul 1997 |
| 236 | Hale Oil Co. | | Oil & Gas Operator | Jan 2025 |
| 237 | Hale, L.D. | Wichita, KS 67230 | Oil Operator | Oct 2019 |
| 238 | Hale, Mike E. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2003 |
| 239 | Halek Energy L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Jan 2014 |
| 240 | Halex Inc | | Oil & Gas Operator | Nov 1988 |
| 241 | Halex Oil Corporation | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 242 | Halfway Oil Inc | Tahlequah, OK 74464-5448 | Oil & Gas Operator | Aug 2013 |
| 243 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 244 | Hall & Horning Serv Inc | Atwater, OH 44201-9375 | Oil & Gas Operator | Dec 2009 |
| 245 | Hall And Kelley Oil & Gas | | Oil Operator | Dec 1995 |
| 246 | Hall Drilling LLC (Oil & Gas) | Ellenboro, WV 26346 | Gas Operator | Sep 2014 |
| 247 | Hall Drilling, LLC | Ellenboro, WV 26346 | Oil & Gas Operator | Dec 2021 |
| 248 | Hall Edward L | Ada, OK 74820-3321 | Oil & Gas Operator | Aug 2025 |
| 249 | Hall Energy Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2016 |
| 250 | Hall Energy Company LLC | Oklahoma City, OK 73120-5020 | Oil & Gas Operator | Jul 2022 |
| 251 | Hall Energy Inc | Magnetic Spring, OH 43036 | Oil & Gas Operator | Dec 2017 |
| 252 | Hall Engineering, Inc. | | Oil & Gas Operator | Jan 2007 |
| 253 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2025 |
| 254 | Hall Farm Leasing, LLC | | Oil Operator | Dec 2012 |
| 255 | Hall IVan & Assoc Inc | Berea, OH 44017 | Oil & Gas Operator | Dec 1997 |
| 256 | Hall Oil & Gas | Coahoma, TX 79511 | Oil & Gas Operator | Dec 2025 |
| 257 | Hall Oil And Gas LLC | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 258 | Hall Oil Company | Humboldt, KS 66748 | Oil Operator | Nov 2009 |
| 259 | Hall Resources Corporation | Independence, MO 64057-2158 | Oil & Gas Operator | Jun 2016 |
| 260 | Hall Richard A | | Oil Operator | Sep 1993 |
| 261 | Hall Thomas E | Marietta, OH 45750 | Oil & Gas Operator | Dec 2021 |
| 262 | Hall, D. Corporation | La Grange, TX 78945 | Oil & Gas Operator | Mar 2013 |
| 263 | Hall, E. G., Oil Co. | Mexia, TX 76667 | Oil & Gas Operator | Dec 2025 |
| 264 | Hall, J.J. Operating Co., Inc. | Lakewood, CO 80215 | Oil Operator | Jan 2005 |
| 265 | Hall, James H ( Trust) | | Gas Operator | Dec 2007 |
| 266 | Hall, Michael Wayne | Toronto, KS 66777 | Oil Operator | Dec 2009 |
| 267 | Hall-Hargraves, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 268 | Hall-Houston Expl. II, L.P. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 269 | Hall-Houston Expl. III, L.P. | Houston, TX 77027 | Oil & Gas Operator | Jul 2013 |
| 270 | Hall-Houston Oil Company | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 271 | Hallador Petroleum Company | | Oil & Gas Operator | Feb 1992 |
| 272 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 273 | Hallar Enterprises, Inc. | | Oil Operator | Oct 2007 |
| 274 | Hallco Petroleum Inc | Oklahoma City, OK 73106-5224 | Oil Operator | Aug 2018 |
| 275 | Halliburton Oil | | Oil & Gas Operator | Sep 2008 |
| 276 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 277 | Halliburton Operating Company | Plano, TX 75093 | Oil & Gas Operator | Dec 2025 |
| 278 | Hallmark Oil And Gas Co., Inc. | | Oil & Gas Operator | Dec 2024 |
| 279 | Hallmark Resources, Inc | Stilwell, OK 74960-0312 | Oil & Gas Operator | Sep 2020 |
| 280 | Hallum Construction Inc | Seminole, OK 74868-2427 | Oil & Gas Operator | Sep 2014 |
| 281 | Hallwell Gas & Oil Co. | | Oil & Gas Operator | Sep 1985 |
| 282 | Hallwood Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2005 |
| 283 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 284 | Hallwood Petroleum | Denver, CO 80237 | Oil & Gas Operator | Dec 1997 |
| 285 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 286 | Hallwood Petroleum, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jan 2010 |
| 287 | Halo Energy L.L.C. | Kilgore, TX 75662 | Oil Operator | Dec 2025 |
| 288 | Halter Ralph P | Robertsville, OH 44670 | Oil Operator | Dec 1999 |
| 289 | Halvey Energy Co. | Midland, TX 79702 | Oil & Gas Operator | Oct 2004 |
| 290 | Halvey Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 291 | Ham Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2000 |
| 292 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 293 | Hamblin Ralph Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 1991 |
| 294 | Hamby Oil LLC | Ellinwood, KS 67526 | Oil Operator | May 2013 |
| 295 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Aug 2025 |
| 296 | Hamill Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1999 |
| 297 | Hamill, Claud B. Estate Of | Houston, TX 77002 | Oil & Gas Operator | Nov 1995 |
| 298 | Hamill, Flora Oil Co. | Levelland, TX 79336 | Oil & Gas Operator | Dec 2025 |
| 299 | Hamilton B J | Ada, OK 74820-9404 | Oil & Gas Operator | Sep 1999 |
| 300 | Hamilton Brother | | Gas Operator | May 1993 |