| 401 | Waymar Oil & Gas Company | Texarkana, TX 75503 | Oil & Gas Operator | Jan 2007 |
| 402 | Wayne Ballinger | | Oil & Gas Operator | Dec 2000 |
| 403 | Wayne E. Glenn Associates, Inc. | Dickinson, TX 77539 | Oil & Gas Operator | Jan 2016 |
| 404 | Wayne Gas Company | | Gas Operator | Dec 2015 |
| 405 | Wayne Hammond Enterprises Inc | Bolivar, OH 44612 | Oil & Gas Operator | Dec 2024 |
| 406 | Wayne Head | Artesia, NM 88210 | Oil & Gas Operator | Apr 2009 |
| 407 | Wayne J. Spears | | Oil & Gas Operator | Sep 2005 |
| 408 | Wayne Moore | Midland, TX 79701 | Oil & Gas Operator | May 1997 |
| 409 | Wayside LTD | | Oil & Gas Operator | Jan 2015 |
| 410 | Wayside Prod Com | | Oil Operator | May 1984 |
| 411 | WB Energy Partners, LLC | | Oil Operator | Dec 2024 |
| 412 | WB Mullin Operating LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 413 | WB Prod MGMT Co | Franklin, PA 16323-0107 | Oil & Gas Operator | Dec 2020 |
| 414 | WBH Energy Partners LLC | Austin, TX 78703 | Oil & Gas Operator | Apr 2026 |
| 415 | Wbi Energy Transmission, Inc. | Glendive, MT 59330-0131 | Gas Operator | Nov 1999 |
| 416 | Wbi Production, Inc. | Glendive, MT 59330-0131 | Gas Operator | Mar 2001 |
| 417 | WBM Enterprises | Creekside, PA 15732-8228 | Oil & Gas Operator | Dec 2025 |
| 418 | WBR, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 1995 |
| 419 | WCC Energy Group LLC | | Oil & Gas Operator | Dec 2024 |
| 420 | Wce Corporation | Billings, MT 59102 | Oil Operator | Jul 1997 |
| 421 | WCS Oil & Gas Corporation | Dallas, TX 75209 | Oil & Gas Operator | Aug 2021 |
| 422 | WCT Leasing Co. | Austin, TX 78734 | Oil & Gas Operator | Apr 2019 |
| 423 | WCWB Energy, LLC | Midland, TX 79701 | Oil Operator | Sep 2015 |
| 424 | WD Oil Company I | | Oil Operator | Apr 1986 |
| 425 | We Energy LLC | Columbus, OH 43229 | Oil Operator | Dec 2020 |
| 426 | Weakland Investments, Inc. | Denver, CO 80215 | Oil & Gas Operator | Apr 2026 |
| 427 | Weal DRLG Co, Inc | Madisonville, KY 42431 | Oil & Gas Operator | Dec 2023 |
| 428 | Weatherly Nell M Estate | Ada, OK 74821-0669 | Oil & Gas Operator | Feb 1997 |
| 429 | Weatherly Oil & Gas, LLC | Dallas, TX 75206 | Oil & Gas Operator | Apr 2026 |
| 430 | Weathers Exploration, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Apr 2026 |
| 431 | Weathersby Oil Co. | | Oil Operator | Oct 2001 |
| 432 | Weatherston, George D. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2001 |
| 433 | Weaver & Mola | | Oil Operator | Dec 1990 |
| 434 | Weaver & Sharp | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Mar 1997 |
| 435 | Weaver & Weaver | | Oil & Gas Operator | Dec 1988 |
| 436 | Weaver Bros | | Oil Operator | Nov 1987 |
| 437 | Weaver Carroll A | Knox, PA 16232 | Oil Operator | Dec 1992 |
| 438 | Weaver Dale Inc | Powell, WY 82435 | Oil Operator | Apr 2005 |
| 439 | Weaver Energy Corporation | Hennessey, OK 73742-1232 | Oil & Gas Operator | Feb 2026 |
| 440 | Weaver Expl & Brock Pet Corp | | Oil & Gas Operator | Apr 1983 |
| 441 | Weaver Exploration Company | | Oil & Gas Operator | Jun 1991 |
| 442 | Weaver Global Operating, LLC | Colleyville, TX 76034 | Oil Operator | Apr 2026 |
| 443 | Weaver Oil & Gas Corporation | | Oil & Gas Operator | Dec 1984 |
| 444 | Weaver Oil Inc | | Oil & Gas Operator | Oct 2011 |
| 445 | Weaver, David H. | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 446 | Web Oil Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 2013 |
| 447 | Webb Donna Delan Dba Petrodudes | Crescent, OK 73028 | Oil & Gas Operator | Dec 2025 |
| 448 | Webb Jess Oil Producer | | Oil Operator | Sep 2014 |
| 449 | Webb John L Estate A Partner | Wichita Falls, TX 76302 | Oil Operator | May 2008 |
| 450 | Webb Resources Inc | | Oil & Gas Operator | Dec 1985 |
| 451 | Webb Roy C | Davis, OK 73030 | Oil & Gas Operator | Dec 2025 |
| 452 | Webb, Max D | Farmington, NM 87499 | Oil Operator | Dec 2022 |
| 453 | Webbco | Bray, OK 73012 | Oil Operator | Aug 1998 |
| 454 | Webber Wesley | Davis, OK 73030 | Oil & Gas Operator | Oct 2009 |
| 455 | Webco Oil Compan | | Oil Operator | Sep 1989 |
| 456 | Webco Oil Company, Inc. | Hoisington, KS 67544 | Oil Operator | Dec 2025 |
| 457 | Weber Energy Corporation | Dallas, TX 75219 | Oil & Gas Operator | Feb 2017 |
| 458 | Weber Four Oil Co., Inc. | Hoisington, KS 67544 | Oil Operator | Dec 2025 |
| 459 | Weber Paul A | N Canton, OH 44720 | Oil & Gas Operator | Dec 1994 |
| 460 | Webster Energy, Inc. | | Oil & Gas Operator | Jan 1999 |
| 461 | Webster Joe | | Oil Operator | Apr 1987 |
| 462 | Webster Oil LLC | Leon, KS 67074 | Oil Operator | Dec 2025 |
| 463 | Wedco Resources Corporation | | Oil & Gas Operator | Jul 1989 |
| 464 | Wedel, Darold | Canton, KS 67428 | Oil Operator | Apr 2002 |
| 465 | Wedgewood Resources USA Inc | Vancouver, BC V6B1V-9000 | Oil & Gas Operator | Jul 2003 |
| 466 | Weeks Exploration Company | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 467 | Weeks, VIrginia | Hoisington, KS 67544 | Oil Operator | Mar 2002 |
| 468 | Wefco, Inc. | Pampa, TX 79065 | Oil & Gas Operator | May 1993 |
| 469 | Weger Petroleum Corp | Dallas, TX 75251 | Oil Operator | Jan 1987 |
| 470 | Wehlu Producers Inc | Edmond, OK 73083-5278 | Oil & Gas Operator | Sep 2002 |
| 471 | Wehmeyer, Gerald | Independence, KS 67301 | Oil Operator | Aug 2024 |
| 472 | Wehunt Oil Company, Inc. | Dallas, TX 75376 | Oil & Gas Operator | Nov 2002 |
| 473 | Weibye, Carolyn S. | Houston, TX 77098 | Oil & Gas Operator | Apr 2026 |
| 474 | Weigel Oil Company, LLC | Gorham, KS 67640 | Oil Operator | Dec 2025 |
| 475 | Weigel V Francis | | Oil Operator | Mar 1994 |
| 476 | Weigel, V. Francis - Family Partnership | Gorham, KS 67640 | Oil Operator | Jul 2004 |
| 477 | Weil Resources, Inc. | Lancaster, NY 14086 | Oil & Gas Operator | Dec 2024 |
| 478 | Weilert Enterpri | | Oil Operator | Sep 1988 |
| 479 | Weilert Michael | | Oil Operator | Oct 1993 |
| 480 | Weilert, S.R. | Wichita, KS 67216 | Oil Operator | Oct 1998 |
| 481 | Weimer & Fitzhugh | Tulsa, OK 74103-4102 | Oil & Gas Operator | Dec 1993 |
| 482 | Weinkauf Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 483 | Weins Horton L | Sand Springs, OK 74063 | Oil & Gas Operator | Jan 2026 |
| 484 | Weinstrom Petroleum | Devine, TX 78016 | Oil Operator | Apr 2026 |
| 485 | Weinsz Oil & Gas Inc | North Canton, OH 44720 | Oil & Gas Operator | Dec 2003 |
| 486 | Weir Oil Co. Inc. | | Oil & Gas Operator | Dec 2007 |
| 487 | Weise, Kevin L. And Kathy L. | Sinclairville, NY 14782 | Gas Operator | Dec 2024 |
| 488 | Weiser-Brown Oil Co | Magnolia, AR 71754 | Oil Operator | Jan 2025 |
| 489 | Weiser-Brown Operating Company | Magnolia, AR 71754 | Oil & Gas Operator | Apr 2026 |
| 490 | Weiss Drilling Inc | Jerusalem, OH 43747 | Oil & Gas Operator | Dec 2025 |
| 491 | Weiss Oil Co. | Streator, IL 61364 | Oil & Gas Operator | Dec 1997 |
| 492 | Weitzman Irvin | | Oil & Gas Operator | Sep 1988 |
| 493 | Weitzman Resources Inc | | Oil & Gas Operator | Jun 2022 |
| 494 | Wejco, Inc. | Rising Star, TX 76471 | Oil & Gas Operator | Apr 2026 |
| 495 | Welch Family LLC | Drumright, OK 74030 | Oil Operator | Feb 2026 |
| 496 | Welch Family Trust | Ada, OK 74820-9643 | Oil & Gas Operator | Apr 2015 |
| 497 | Welch Oil & Gas Company | Parkersburg, WV 26104 | Oil & Gas Operator | Jun 2013 |
| 498 | Welcome Well Serv. & Boykin Bros | Abilene, TX 79604 | Oil & Gas Operator | Apr 1995 |
| 499 | Weldbank Energy Corp | Warren, PA 16365-5114 | Oil & Gas Operator | Dec 2025 |
| 500 | Welder Exploration & Prod., Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Dec 2022 |