| 501 | Target Oil & Gas Corp | | Oil & Gas Operator | Dec 2013 |
| 502 | Tarter, Donald & David | Dunnville, KY 42528 | Oil Operator | Dec 2020 |
| 503 | Tdoc, Inc | Evansville, IN 47716 | Oil Operator | Dec 2022 |
| 504 | Tennessee Properties, Inc | | Oil Operator | Dec 2014 |
| 505 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 506 | Texas Gas Transmission, LLC | Owensboro, KY 42301 | Oil & Gas Operator | Dec 2024 |
| 507 | The Texas Company | FT Worth, TX 76101 | Oil & Gas Operator | Dec 2013 |
| 508 | Thomasson Petroleum Enterprises, Inc | Bremen, KY 42325 | Oil Operator | Dec 2024 |
| 509 | Titan Resources, Inc | Somerset, KY 42502 | Oil & Gas Operator | Dec 2024 |
| 510 | Transatlantic Expl LTD Dba Ravenna Oil | Beattyville, KY 41311 | Oil Operator | Dec 2023 |
| 511 | Travell Energy, Inc | | Oil Operator | Dec 2023 |
| 512 | Trey Exploration, Inc. | San Angelo, TX 76901 | Oil & Gas Operator | Dec 2019 |
| 513 | Triad Hunter, LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2021 |
| 514 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 515 | Trico Energy LLC | Hager Hill, KY 41222 | Oil Operator | Dec 2018 |
| 516 | Trico/Tiger Development LLC | | Oil & Gas Operator | Dec 2020 |
| 517 | Trinity Group LLC | | Oil Operator | Dec 1997 |
| 518 | Tug Fork Development | Catlettsburg, KY 41129 | Gas Operator | Dec 2021 |
| 519 | Uae Investco 1 (Estill), LLC | Ravenna, KY 40472 | Oil Operator | Dec 2022 |
| 520 | Uae Investco 2 (Lee), LLC | Ravenna, KY 40472 | Oil Operator | Dec 2021 |
| 521 | Union Operating Corp | Lakewoord, CO 80215 | Oil Operator | Dec 2023 |
| 522 | Union Petro Inc | Uniontown, KY 42461 | Oil Operator | Dec 2024 |
| 523 | United Well Completion, Inc | Corbin, KY 40701 | Oil & Gas Operator | Dec 2024 |
| 524 | Universal Operating, Inc | Evansville, IN 47715 | Oil & Gas Operator | Dec 2024 |
| 525 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 526 | Van Lingen, Peter | Nashville, TN 37215 | Oil Operator | Dec 2023 |
| 527 | Viking Exploration, LLC | Mousie, KY 41839 | Oil & Gas Operator | Dec 2024 |
| 528 | Viking Oil & Gas, LLC | Caneyville, KY 42721 | Oil & Gas Operator | Dec 2024 |
| 529 | Vinland Energy Operations, LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2024 |
| 530 | Vogler, John F | Greenville, KY 42345 | Oil Operator | Dec 2023 |
| 531 | W W Pet Service, Inc | Dixon, KY 42409 | Oil & Gas Operator | Dec 2019 |
| 532 | Walker Resources Co, LLC | | Oil & Gas Operator | Dec 2013 |
| 533 | Watts, J R | | Oil Operator | Dec 2009 |
| 534 | WB Energy Partners, LLC | | Oil Operator | Dec 2024 |
| 535 | Weal DRLG Co, Inc | Madisonville, KY 42431 | Oil & Gas Operator | Dec 2023 |
| 536 | Wema Natural Res, Inc | Sharon Grove, KY 42280 | Oil Operator | Dec 2021 |
| 537 | West Bay Exploration Company | Muenster, TX 76252 | Oil & Gas Operator | May 2026 |
| 538 | West Gas Inc | | Oil & Gas Operator | Dec 2017 |
| 539 | Wheeler Oil, LTD | Isonville, KY 41149 | Oil & Gas Operator | Dec 2023 |
| 540 | Whitney Oil & Gas Co, LLC | | Oil & Gas Operator | Dec 2017 |
| 541 | Whittington Energy Co. | Melbourne, FL 32901 | Oil & Gas Operator | Jul 2026 |
| 542 | Wildcat Oil, LLC | Sebree, KY 42455 | Oil Operator | Dec 2021 |
| 543 | William B Renfro LLC | | Oil Operator | Dec 2020 |
| 544 | Williams, Floyd E | | Oil Operator | Dec 2015 |
| 545 | Williams, John E | Scottsville, KY 42164 | Oil Operator | Dec 2015 |
| 546 | Wilson, Bruce Oil Inc | Columbia, KY 42728 | Oil Operator | Dec 2024 |
| 547 | Wiser Oil Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2023 |
| 548 | Wood, Clarence & Lacy, W F | | Oil Operator | Dec 2019 |
| 549 | Woody, James S & Blair, Sammy | Columbia, KY 42728 | Oil & Gas Operator | Dec 2024 |
| 550 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2026 |
| 551 | Yates Drilling Company | Artesia, NM 88210 | Oil & Gas Operator | Dec 2021 |
| 552 | Yost, Barbra E | | Oil Operator | Dec 2018 |
| 553 | Young Oil Corporation | | Oil & Gas Operator | Dec 2019 |
| 554 | Zaveri Oil & Gas LTD | Albany, KY 42602 | Oil Operator | Dec 2006 |
| 555 | Zenithal LLC | Isonville, KY 41149 | Oil & Gas Operator | Dec 2024 |