| 301 | Kraker & Martin Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 302 | Kram Energy | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Feb 2026 |
| 303 | Kramer Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 304 | Kramer, Clifford A. | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 1997 |
| 305 | Kramer, Frank & Ethel FLP | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 306 | Kramer, Frank C. | Graham, TX 76450 | Oil & Gas Operator | Apr 2004 |
| 307 | KRC Operating, LLC | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Oct 2025 |
| 308 | Kremco Oil LLC | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 309 | Krenek Enterprises, Inc. | Lovelady, TX 75851 | Oil Operator | Feb 2026 |
| 310 | Krescent Energy Company, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2013 |
| 311 | KRF Production Company LLC | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 312 | Kriken Oil & Gas | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Jul 2005 |
| 313 | Kriken Oil & Gas, Inc. | Corpus Chrsti, TX 78426 | Oil & Gas Operator | Feb 2026 |
| 314 | Krisco Oil Co. | Kermit, TX 79745 | Oil Operator | Jul 2022 |
| 315 | Kristen Oil And Gas, Inc. | Edna, TX 77957 | Oil & Gas Operator | Feb 2026 |
| 316 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 317 | Kriti Te Energy, Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 2017 |
| 318 | Krocan Energy Corporation | Bowling Green, KY 42102 | Oil & Gas Operator | Feb 2026 |
| 319 | Krog Partners, LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 320 | Kroh Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 321 | Krot Oil Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 322 | KRS Oil Company | Frisco, TX 75034 | Oil & Gas Operator | Apr 2020 |
| 323 | Ksabe Energy Partners, LLC | Oklahoma City, OK 73106 | Oil Operator | Feb 2026 |
| 324 | Kstone Energy, LLC | Oklahoma City, OK 73106 | Oil Operator | Feb 2026 |
| 325 | KT Operating Company LLC | Dallas, TX 75231 | Oil & Gas Operator | Feb 2010 |
| 326 | KTC Oil Enterprises, LLC | Dallas, TX 75247 | Oil & Gas Operator | Feb 2026 |
| 327 | KTP Energy, Inc. | Denver, CO 80226 | Oil & Gas Operator | Aug 2019 |
| 328 | Kuehne Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 329 | Kuhn Oil Co Inc | Timber Lake, SD 57656 | Oil Operator | Dec 2024 |
| 330 | Kukui Operating Company | Ignacio, CO 81137 | Oil & Gas Operator | May 2013 |
| 331 | Kunu Energy LLC | Wichita Falls, TX 76310 | Oil Operator | Feb 2026 |
| 332 | Kuran Resources | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 333 | Kuykendall, IValene Estate | Electra, TX 76360 | Oil & Gas Operator | Dec 1998 |
| 334 | Kuykendall, M. C. | Electra, TX 76360 | Oil & Gas Operator | Apr 1995 |
| 335 | Kuykendall, M.C., Estate | Electra, TX 76360 | Oil & Gas Operator | Aug 2003 |
| 336 | KVL Operating, LLC | Midland, TX 79708 | Oil & Gas Operator | Feb 2026 |
| 337 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 338 | KWS Oil & Gas, LLC | Wink, TX 79789 | Oil & Gas Operator | Feb 2026 |
| 339 | Kynge Energy Investments LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 340 | Kynosa Inc. | Levelland, TX 79336 | Oil & Gas Operator | Jun 1998 |
| 341 | KZ Global Energy, LLC | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |