| 12501 | Williams Oil Company | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 12502 | Williams Petroleum Company, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Feb 2026 |
| 12503 | Williams Prod. Gulf Coast, L.P. | Benbrook, TX 76126 | Oil & Gas Operator | Jan 2012 |
| 12504 | Williams Production RMT Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2010 |
| 12505 | Williams, A. Oil | Wichita Falls, TX 76308 | Oil Operator | Feb 2026 |
| 12506 | Williams, Clayton Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Feb 2026 |
| 12507 | Williams, Clayton Energy, L.L.C | Midland, TX 79705 | Oil & Gas Operator | May 1993 |
| 12508 | Williams, Clayton W., Jr., Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 12509 | Williams, H. E. | Houston, TX 77002 | Oil & Gas Operator | Dec 1994 |
| 12510 | Williams, W. R. | Amarillo, TX 79105 | Oil & Gas Operator | Jun 2013 |
| 12511 | Williams, W. R., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Feb 2024 |
| 12512 | Williams-Cody, Inc. | Houston, TX 77060 | Oil & Gas Operator | May 1994 |
| 12513 | Williamson Oil & Gas, Inc. | Shreveport, LA 71166 | Oil & Gas Operator | Dec 2024 |
| 12514 | Williamson Operating Co. | Uvalde, TX 78801 | Oil & Gas Operator | Feb 2026 |
| 12515 | Williamson Operating Co., LLC | Stamps, AR 71860 | Oil & Gas Operator | Feb 2026 |
| 12516 | Williamson, Don B. | Athens, TX 75751 | Oil & Gas Operator | Mar 2002 |
| 12517 | Williamson, Harry W. Inc. | Abilene, TX 79604 | Oil & Gas Operator | May 1995 |
| 12518 | Williamson, J. C. | Midland, TX 79701 | Oil & Gas Operator | Jan 2001 |
| 12519 | Williamson, Ralph E. | Midland, TX 79702 | Oil & Gas Operator | Jan 2012 |
| 12520 | Williford Energy Company | Tulsa, OK 74135 | Oil & Gas Operator | Feb 2026 |
| 12521 | Williford Petroleum, L.L.C. | Green CV SPGS, FL 32043 | Oil & Gas Operator | Feb 2026 |
| 12522 | Willis Operating Co. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 12523 | Willo Oil & Gas Exploration, LLC | Boerne, TX 78006 | Oil & Gas Operator | Jul 2020 |
| 12524 | Willow Bend Oil LLC | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 12525 | Willow Creek Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2009 |
| 12526 | Willow Springs Prod. Serv.,LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 1997 |
| 12527 | Willow Springs Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 1999 |
| 12528 | Willowbend Investments, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 12529 | Willowick Production LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 12530 | Wills Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 12531 | Wills Oil Holdings, L.L.C. | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 12532 | Willstar Energy GP, LLC | Houston, TX 77279 | Oil & Gas Operator | Sep 2013 |
| 12533 | Wilmoth Interests, Inc. | Marion Center, PA 15759 | Oil & Gas Operator | Dec 2025 |
| 12534 | Wilshire Oil Co. Of Texas | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2004 |
| 12535 | Wilson - Owens Production Co. | Longview, TX 75601 | Oil & Gas Operator | Nov 1998 |
| 12536 | Wilson Brothers Leasing Co., Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2015 |
| 12537 | Wilson Energy LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 12538 | Wilson Energy Resources LLC | Graham, TX 76450 | Oil Operator | Feb 2026 |
| 12539 | Wilson Exploration Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 1996 |
| 12540 | Wilson Hydrocarbon Inc. | Houston, TX 77066 | Oil & Gas Operator | Feb 2026 |
| 12541 | Wilson Oil Co. | Houston, TX 77263 | Oil & Gas Operator | Feb 2026 |
| 12542 | Wilson Operating Co. | Archer City, TX 76351 | Oil & Gas Operator | Feb 2026 |
| 12543 | Wilson Operating Company LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2026 |
| 12544 | Wilson Operating Service Inc | Brownfield, TX 79316 | Oil & Gas Operator | Aug 2003 |
| 12545 | Wilson Petroleum Co. | Springfield, MO 65803 | Oil & Gas Operator | Feb 2026 |
| 12546 | Wilson Resources, Inc. | Longview, TX 75601 | Oil & Gas Operator | Feb 2026 |
| 12547 | Wilson Well Service Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Feb 2026 |
| 12548 | Wilson, Billy R. | New Braunfels, TX 78130 | Oil & Gas Operator | Feb 2026 |
| 12549 | Wilson, Charles B., Jr., Inc. | Houston, TX 77027 | Oil & Gas Operator | Apr 2000 |
| 12550 | Wilson, David A. | Longview, TX 75606 | Oil & Gas Operator | Mar 1997 |
| 12551 | Wilson, Dell | Odessa, TX 79762 | Oil & Gas Operator | Aug 2004 |
| 12552 | Wilson, Dewey | Coleman, TX 76834 | Oil & Gas Operator | Nov 2007 |
| 12553 | Wilson, Don H., Inc. | Elkhart, TX 75839 | Oil & Gas Operator | May 2019 |
| 12554 | Wilson, E. C. Enterprises, Inc. | Houston, TX 77056 | Gas Operator | May 1993 |
| 12555 | Wilson, Jerry L. | Ranger, TX 76470 | Oil & Gas Operator | Feb 2026 |
| 12556 | Wilson, Olan Max | Cisco, TX 76437 | Oil & Gas Operator | Feb 2026 |
| 12557 | Wilson, W. Corp. | Midland, TX 79705 | Oil & Gas Operator | Mar 1999 |
| 12558 | Wilson, W.W. Jr. Properties | Abilene, TX 79605 | Oil & Gas Operator | Jul 1995 |
| 12559 | Wilson, WM. B. Exploration Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 12560 | Wilson-Shab Corp. | Electra, TX 76360 | Oil & Gas Operator | Feb 2026 |
| 12561 | Wilton Oil Company | Dallas, TX 75206 | Oil & Gas Operator | Apr 1999 |
| 12562 | Wilton, Frank | Graham, TX 76450 | Oil & Gas Operator | Oct 2016 |
| 12563 | Wimberley Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2013 |
| 12564 | Wimco | Dallas, TX 75229 | Oil & Gas Operator | Jul 2008 |
| 12565 | Wimsco, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Dec 1994 |
| 12566 | Winchester Energy Operating Co. | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 12567 | Winchester Energy, LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 12568 | Winchester Exploration, Inc. | Arlington, TX 76013 | Oil & Gas Operator | Aug 2003 |
| 12569 | Winchester Oil & Gas LLC | Rockdale, TX 76567 | Oil Operator | Feb 2026 |
| 12570 | Winchester Operating, Inc. | Bryan, TX 77808 | Oil & Gas Operator | Aug 2001 |
| 12571 | Winchester Production Co., LTD. | Shreveport, LA 71129 | Oil & Gas Operator | Sep 2008 |
| 12572 | Winchester Production Company | Shreveport, LA 71129 | Oil & Gas Operator | Nov 2008 |
| 12573 | Winco Oil Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 12574 | Winco Petroleum Company | Richardson, TX 75080 | Oil & Gas Operator | Jan 2003 |
| 12575 | Wind River Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 12576 | Wind River Resources Inc | Tulsa, OK 74136-6381 | Oil & Gas Operator | Jun 2010 |
| 12577 | Windham Resources | Abilene, TX 79608 | Oil & Gas Operator | Feb 2026 |
| 12578 | Windham Resources, Inc. | Tuscola, TX 79562 | Oil & Gas Operator | Feb 2004 |
| 12579 | Windham, L. E. | Rankin, TX 79778 | Oil & Gas Operator | Dec 1996 |
| 12580 | Windham, L.E. Estate Of | Midland, TX 79702 | Oil & Gas Operator | Mar 2012 |
| 12581 | Windmill Oil Company | Austin, TX 78747 | Oil & Gas Operator | Mar 2008 |
| 12582 | Window Operating Co., The | Coleman, TX 76834 | Oil & Gas Operator | Feb 2026 |
| 12583 | Windrush Operating Co., L.L.C. | Longville, LA 70652 | Oil & Gas Operator | Feb 2026 |
| 12584 | Windsor Energy Group LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Aug 2021 |
| 12585 | Windsor Exploration Company | Dallas, TX 75204 | Oil & Gas Operator | Jan 1994 |
| 12586 | Windsor Permian LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2012 |
| 12587 | Windy Cove Energy II, LLC | Houston, TX 77079 | Oil & Gas Operator | Sep 2020 |
| 12588 | Wineglass Production, LLC | Ranger, TX 76470 | Oil Operator | Feb 2026 |
| 12589 | Wineland Oil - LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 12590 | Wineridge Inc. | Austin, TX 78747 | Oil Operator | Feb 2026 |
| 12591 | Winfield Operating Company | Dallas, TX 75214 | Oil & Gas Operator | Feb 2026 |
| 12592 | Winfrey Oil Co., Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2016 |
| 12593 | Wing Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2000 |
| 12594 | Wingrove Operating, LLC | Odessa, TX 79760 | Oil Operator | Feb 2026 |
| 12595 | Wingrove Well Service, Inc. | Lueders, TX 79533 | Oil & Gas Operator | Nov 2023 |
| 12596 | Winn Exploration Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 12597 | Winn Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 12598 | Winright Resources Operating,LLC | Houston, TX 77007 | Oil & Gas Operator | Feb 2026 |
| 12599 | Winslow Operating Company, LLC | Austin, TX 78737 | Oil & Gas Operator | Feb 2026 |
| 12600 | Winslow, Harry C. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 2026 |