| 301 | Terrol Energy Incorporated | Hygiene, CO 80533 | Oil & Gas Operator | Dec 2006 |
| 302 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 303 | Texkan Exploration LLC | Plainville, KS 67663 | Oil Operator | Dec 2019 |
| 304 | Texkan Resources, LLC | Odessa, TX 79765 | Oil & Gas Operator | Jun 2025 |
| 305 | TGT Petroleum Co | | Oil & Gas Operator | Apr 1995 |
| 306 | Thomason Petroleum, Inc | Hays, KS 67601 | Oil Operator | Jun 2021 |
| 307 | Thunder Oil & Gas, LLC | Ardmore, OK 73402 | Oil & Gas Operator | Jul 2026 |
| 308 | TMM Investments LTD. | Tyler, TX 75703 | Oil Operator | Feb 2026 |
| 309 | Tom'S Oil | | Oil Operator | Apr 2026 |
| 310 | Tomlinson Oil Co Inc | Great Bend, KS 67530 | Oil & Gas Operator | Mar 2026 |
| 311 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jul 2026 |
| 312 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 313 | Tri United, Inc | Hays, KS 67601 | Oil Operator | May 2026 |
| 314 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 315 | Unrein Oil Co | | Oil Operator | May 2026 |
| 316 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Sep 2026 |
| 317 | V & F Oil Company, A General Partnership | Hays, KS 67601 | Oil Operator | May 2026 |
| 318 | Venture Resources, Inc. | Denver, CO 80250 | Oil Operator | May 2026 |
| 319 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 320 | Vicorp Energy In | | Oil Operator | Apr 1988 |
| 321 | Viking Resources, Inc. | Stafford, TX 77477 | Oil & Gas Operator | Sep 2026 |
| 322 | Vincent Oil Corp | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 323 | Vji Natural Resources, Inc. | | Oil & Gas Operator | May 2026 |
| 324 | Werth Exploration Trust | | Oil Operator | Dec 2013 |
| 325 | Western Kansas E | | Oil Operator | Aug 1993 |
| 326 | White Eagle Resources Corp. | Taos, NM 87571 | Oil & Gas Operator | Jun 2016 |
| 327 | Wildhorse Oil | Bogue, KS 67625 | Oil Operator | Oct 1994 |
| 328 | WM KS Energy Resources LLC | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2019 |
| 329 | Woodman & Iannit | | Oil & Gas Operator | Sep 1996 |
| 330 | Yost Oil Operati | | Oil Operator | Jul 1990 |
| 331 | Zenith Drilling | | Oil & Gas Operator | Aug 1995 |