| 1301 | Tracy Co. | Rockdale, TX 76567 | Oil & Gas Operator | Mar 2022 |
| 1302 | Tracy Operating Co., LLC | Rockdale, TX 76567 | Oil & Gas Operator | Jul 2025 |
| 1303 | Tracy Production | Lindale, TX 75771 | Oil & Gas Operator | Jul 2025 |
| 1304 | Trade & Development Corp | | Oil & Gas Operator | Nov 1996 |
| 1305 | Tradestar Energy, Inc. | Hot Springs, AR 71913 | Oil Operator | Feb 2021 |
| 1306 | Tradition Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1307 | Tradition Resources Oper, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2017 |
| 1308 | Trafalgar House Oil & Gas Inc. | Houston, TX 77002-7346 | Oil & Gas Operator | Jan 1992 |
| 1309 | Trahan Petroleum Inc | | Oil Operator | May 2025 |
| 1310 | Trail Mountain, Inc. | Artesia, NM 88210 | Oil & Gas Operator | Jan 2016 |
| 1311 | Trail Ridge Energy Partners, LLC | Grapevine, TX 76051 | Oil & Gas Operator | May 2025 |
| 1312 | Trail Ridge Energy PRTNS II LLC | Grapevine, TX 76051 | Oil & Gas Operator | Jun 2017 |
| 1313 | Trailblazer Energy LLC | Plano, TX 75075 | Oil & Gas Operator | Apr 2025 |
| 1314 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 1315 | Trailhead Exploration, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 1316 | Traillour Oil Co. | | Oil & Gas Operator | Mar 1990 |
| 1317 | Trans Atlantic Ener Corp | Caldwell, OH 43724 | Oil & Gas Operator | Dec 1993 |
| 1318 | Trans Atlantic Resource Corp | Tulsa, OK 74136-5709 | Oil & Gas Operator | Nov 1998 |
| 1319 | Trans Energy, Inc. | St. Marys, WV 26170 | Oil & Gas Operator | Dec 2017 |
| 1320 | Trans Ocean Oil, Inc. | Houston, TX 77252 | Oil & Gas Operator | Sep 1980 |
| 1321 | Trans Pacific Oi | | Oil & Gas Operator | May 1995 |
| 1322 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | May 2025 |
| 1323 | Trans Resource D | | Oil Operator | May 1991 |
| 1324 | Trans Terra Corp., International | Amarillo, TX 79159 | Oil & Gas Operator | Feb 2009 |
| 1325 | Trans Texas Minerals Company | Austin, TX 78714 | Oil & Gas Operator | Aug 1999 |
| 1326 | Trans-Gulf Petroleum Corp | | Oil & Gas Operator | Sep 1999 |
| 1327 | Trans-Pacific Oil & Gas Inc. | | Oil & Gas Operator | Mar 1982 |
| 1328 | Trans-Pecos Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 1329 | Trans-Sabine Pipeline Corp | | Oil Operator | Mar 2009 |
| 1330 | Trans-Tex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Jul 2025 |
| 1331 | Trans-Texas Energy Group LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Jul 2015 |
| 1332 | Trans-Texas Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Feb 1993 |
| 1333 | Trans-Western Expl. Inc. | Dallas, TX 75240 | Oil & Gas Operator | Mar 1993 |
| 1334 | Trans-Western Operating Company | Golden, CO 80402 | Oil Operator | Mar 2025 |
| 1335 | Transamer Petro Corp | Pittsburgh, PA 15222-3510 | Gas Operator | Dec 1985 |
| 1336 | Transamerica Energy Corp. | Atlanta, GA 30356 | Oil & Gas Operator | Jul 2025 |
| 1337 | Transamerica Oil | | Oil & Gas Operator | Sep 1992 |
| 1338 | Transamerica Oil Corporation | Hutchinson, KS 67504 | Gas Operator | Mar 2025 |
| 1339 | Transamerican Energy LTD | Dallas, TX 75231-1075 | Oil & Gas Operator | Apr 2014 |
| 1340 | Transamerican Energy/Toce Oil | | Oil & Gas Operator | Dec 1994 |
| 1341 | Transamerican Natural Gas Corp. | Houston, TX 77032 | Oil & Gas Operator | Aug 2000 |
| 1342 | Transamerican-Swepi-Toce Oil | | Oil & Gas Operator | Apr 1990 |
| 1343 | Transatlantic Expl LTD Dba Ravenna Oil | Beattyville, KY 41311 | Oil Operator | Dec 2023 |
| 1344 | Transatlantic Petr (USA) Corp. | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 1345 | Transco Exploration Company | | Oil & Gas Operator | Jul 1989 |
| 1346 | Transco Oil & Gas Inc. | | Gas Operator | Dec 1992 |
| 1347 | Transcoastal Operating LLC | Dallas, TX 75252-5646 | Oil & Gas Operator | Mar 2015 |
| 1348 | Transcontinental Company | Haltom City, TX 76148-4122 | Oil & Gas Operator | May 2025 |
| 1349 | Transcontinental Gas P/L Corp. | | Oil & Gas Operator | Dec 2009 |
| 1350 | Transcontinental Gas Pipeline Co LLC | | Oil Operator | Jan 2025 |
| 1351 | Transcontinental Minerals Corp. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2008 |
| 1352 | Transcontinental Oil & Gas Inc | Aurora, OH 44202 | Oil & Gas Operator | Dec 2024 |
| 1353 | Transcontinental Oil Corp. | | Oil & Gas Operator | Sep 1985 |
| 1354 | Transcontinental Shale L.L.C. | Austin, TX 78717 | Oil & Gas Operator | Feb 2016 |
| 1355 | Transfuel Resources Co | Houston, TX 77215 | Oil & Gas Operator | Aug 2013 |
| 1356 | Transglobe Oil & Gas Corporation | Littleton, CO 801222710 | Oil & Gas Operator | Dec 1999 |
| 1357 | Transhorizon Energy Inc | Cheyenne, WY 82003 | Oil & Gas Operator | Jul 2023 |
| 1358 | Transit Energy Inc | North Lawrence, OH 44666 | Oil & Gas Operator | Dec 2024 |
| 1359 | Transoil, Inc. | Oklahoma City, OK 73129 | Oil & Gas Operator | Jul 2025 |
| 1360 | Transok LLC | Oklahoma City, OK 73124-0300 | Oil & Gas Operator | Jul 2020 |
| 1361 | Transpac Petroleum Inc. | | Oil & Gas Operator | Dec 1995 |
| 1362 | Transpacific Energy, LLC | Katy, TX 77450 | Oil & Gas Operator | Jul 2025 |
| 1363 | Transpetco I | Shreveport, LA 71101 | Oil & Gas Operator | May 2009 |
| 1364 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 1365 | Transworld Expl. & Prod., Inc. | | Oil & Gas Operator | Mar 2004 |
| 1366 | Transworld Systems Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 1367 | Trap Rock Oil Company | Cambridge, MA 02138 | Oil & Gas Operator | Nov 2005 |
| 1368 | Trap Rock Oil, LTD. | Houston, TX 77005 | Oil & Gas Operator | Jul 2025 |
| 1369 | Trapp Oil Oper - | | Oil Operator | Aug 1989 |
| 1370 | Traton Operating Company | Kingwood, TX 77339 | Oil & Gas Operator | Mar 2019 |
| 1371 | Travco Well Servicing LLC | Okmulgee, OK 74447 | Oil Operator | Apr 2025 |
| 1372 | Travelers Oil Company | Amarillo, TX 79102 | Oil & Gas Operator | Jul 2025 |
| 1373 | Travell Energy, Inc | | Oil Operator | Dec 2023 |
| 1374 | Traver Oil & Gas Corporation | | Oil & Gas Operator | Sep 2000 |
| 1375 | Traver Oil Company | | Oil & Gas Operator | Sep 2000 |
| 1376 | Traver-Patterson Petroleum Inc | | Oil & Gas Operator | May 1990 |
| 1377 | Travers Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 1378 | Traverse Oil Co And Federal Oil Co | | Oil & Gas Operator | Nov 1983 |
| 1379 | Traverse Oil Co. | | Oil & Gas Operator | Nov 1983 |
| 1380 | Travis | Houston, TX 77057 | Oil Operator | Jul 2025 |
| 1381 | Travis Coomer DRLG Co | | Oil Operator | Dec 2023 |
| 1382 | Travis E. Duren | | Oil Operator | Jul 1995 |
| 1383 | Travis Oil Co | Los Angeles, CA 90024 | Oil Operator | Jan 1990 |
| 1384 | Travis Operating, LLC | Kingwood, TX 77345 | Oil & Gas Operator | Jul 2025 |
| 1385 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 1386 | Travis, J. J., Trustee | Rockport, TX 78382 | Oil & Gas Operator | Dec 1996 |
| 1387 | Traxler, Joyce | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 1388 | Traynor Oil & Gas Inc | Claremont, CA 91711-2837 | Oil & Gas Operator | Jan 2024 |
| 1389 | TRC Cypress Group LLC | | Oil & Gas Operator | Apr 2025 |
| 1390 | TRC Operating Company Inc. | | Oil & Gas Operator | May 2025 |
| 1391 | Tre'J Exploration, Inc. | | Gas Operator | Dec 1991 |
| 1392 | Treadaway Oil Co. | Balmorhea, TX 79718 | Oil & Gas Operator | Jul 2025 |
| 1393 | Treadstone Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2016 |
| 1394 | Treadstone Energy PRTNR Op, LLC | Katy, TX 77494 | Oil & Gas Operator | Jul 2025 |
| 1395 | Treat Howard | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2014 |
| 1396 | Trebole Operating Company | | Oil Operator | Jul 1979 |
| 1397 | Treco Oil Company | Albany, TX 76430 | Oil & Gas Operator | Jul 2025 |
| 1398 | Tredegar Properties, Inc. | | Oil Operator | Jun 1990 |
| 1399 | Tree Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 1400 | Trees Oil Compan | | Oil Operator | Jan 1995 |