| 301 | T B Drilling Co | Moxahala, OH 43761 | Oil & Gas Operator | Dec 1998 |
| 302 | T JS Oil & Gas Inc | Fresno, OH 43824 | Oil & Gas Operator | Dec 2023 |
| 303 | Tatum Petroleum Co LLC | Zanesville, OH 43702 | Oil & Gas Operator | Dec 2018 |
| 304 | Tatum Petroleum Corp | Zanesville, OH 43702 | Oil & Gas Operator | Dec 2008 |
| 305 | Temple Oil & Gas Co | Crooksville, OH 43731 | Oil & Gas Operator | Dec 2024 |
| 306 | Terrgin Oil & Gas LLC | Frazeysburg, OH 43822 | Oil & Gas Operator | Dec 2021 |
| 307 | The East Ohio Gas Company Dba Enbridge Gas Ohio | North Canton, OH 44720 | Oil & Gas Operator | Dec 2025 |
| 308 | The Edward H Everett Company | Newark, OH 43055 | Oil & Gas Operator | Dec 2025 |
| 309 | Thompson Consumer Electronics | Indianapolis, IN 46290 | Oil & Gas Operator | Dec 1998 |
| 310 | Thompson Floyd Oil Co Inc | Boca Raton, FL 44328 | Oil & Gas Operator | Dec 1988 |
| 311 | Tiger Oil, Inc. | Canal Wincheste, OH 43110 | Oil & Gas Operator | Dec 2007 |
| 312 | Tipka Energy Devlopment Company | New Philadelphi, OH 44663 | Oil & Gas Operator | Dec 2020 |
| 313 | Tipka William N | Dover, OH 44622 | Oil & Gas Operator | Dec 1988 |
| 314 | Titan Energy Corp | Thomasville, AL 36784 | Oil & Gas Operator | Aug 2009 |
| 315 | Trenmor Gas & Oil Co LLC | Frazeysburg, OH 43822 | Oil Operator | Dec 2023 |
| 316 | Turrill Sheldon L | Westerville, OH 43081 | Oil & Gas Operator | Dec 1984 |
| 317 | Twinoaks Oil & Gas Co | Newark, OH 43058 | Oil & Gas Operator | Dec 2025 |
| 318 | United O&G/Atlee Miller | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1985 |
| 319 | Unity Petroleum | Howard, OH 43028 | Oil & Gas Operator | Dec 2021 |
| 320 | Unknown Owner | Columbus, OH 43229 | Oil & Gas Operator | Dec 2008 |
| 321 | Valley Petroleum Management | Utica, OH 43080 | Oil & Gas Operator | Dec 2025 |
| 322 | Vanguard Oil & Gas LLC | East Lansing, MI 48826 | Oil & Gas Operator | Dec 2024 |
| 323 | Victor McKenzie Drilling Co Inc | Zanesville, OH 43702-3323 | Oil & Gas Operator | Dec 2023 |
| 324 | W K Frost Inc | Newark, OH 43055 | Oil & Gas Operator | Dec 2020 |
| 325 | W P Brown Enterprises Inc | Byesville, OH 43723 | Oil & Gas Operator | Dec 2025 |
| 326 | Waldron David A | Wooster, OH 44691 | Oil & Gas Operator | Dec 2003 |
| 327 | Wallick Petroleum Co | Reynoldsburg, OH 43068 | Oil & Gas Operator | Dec 1994 |
| 328 | Warren C J Oil Co | MT Carmel, IL 62863 | Oil & Gas Operator | Dec 1984 |
| 329 | Welsh Hills Oil & Gas Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1999 |
| 330 | Wheeler Michael D | Newark, OH 43055 | Oil & Gas Operator | Dec 2025 |
| 331 | Whited Roger (Dba Patchwork Oil & Gas LLC) | Davisville, WV 26142 | Oil & Gas Operator | Dec 2024 |
| 332 | William S Miller Inc | Hanoverton, OH 44423 | Oil & Gas Operator | Dec 2025 |
| 333 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 334 | Witco Corporation | Newark, OH 43055 | Oil & Gas Operator | Dec 1995 |
| 335 | WNT Operating Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2001 |
| 336 | Wolford Ben & Bonnie | Frazeysburg, OH 43822 | Oil Operator | Dec 2016 |
| 337 | Wood Donald E | Independence, KS 67301 | Oil & Gas Operator | Dec 2025 |
| 338 | Yei Inc | Columbus, OH 43214 | Oil & Gas Operator | Dec 1988 |
| 339 | Zenith Oil & Gas Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 340 | Zilkha Energy Inc | Houston, TX 77002-5223 | Oil & Gas Operator | Dec 2008 |