| 12501 | Xhorizons Energy LLC | Houston, TX 77079 | Oil Operator | Dec 2025 |
| 12502 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 12503 | Xog Resources, LLC | Spring, TX 77379 | Oil & Gas Operator | Dec 2025 |
| 12504 | Xophi Energy, LLC | Arlington, TX 76006 | Oil & Gas Operator | Dec 2025 |
| 12505 | Xplor Energy Operating Co. | Houston, TX 77079 | Oil & Gas Operator | Jan 2012 |
| 12506 | Xplore Operating, LLC | Arlington, TX 76001 | Oil & Gas Operator | Dec 2025 |
| 12507 | Xstar Resources LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 12508 | Xta Resources LLC | Uvalde, TX 78801 | Oil & Gas Operator | Dec 2025 |
| 12509 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 12510 | XTO Offshore Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2010 |
| 12511 | Xtra Energy, LLC | Fort Worth, TX 76161 | Oil & Gas Operator | Dec 2025 |
| 12512 | Xtreme Operating Company LLC | Flower Mound, TX 75022 | Oil Operator | Dec 2025 |
| 12513 | Xyz Oil, Inc. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 12514 | Y Oil Company Inc. | Cameron, TX 76520 | Oil & Gas Operator | Dec 2025 |
| 12515 | Yale Oil Association | Oklahoma City, OK 73105 | Gas Operator | Oct 2013 |
| 12516 | Yale Oil Association, Inc. | Oklahoma City, OK 73105 | Oil & Gas Operator | Sep 2025 |
| 12517 | Yanahosa, Inc. | Kountze, TX 77625 | Oil Operator | Dec 2025 |
| 12518 | Yarberry Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 12519 | Yarberry, E. E. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2015 |
| 12520 | Yarborough Oil & Gas L.P. | Midland, TX 79701 | Oil & Gas Operator | Oct 2000 |
| 12521 | Yarborough, W. B. | Midland, TX 79701 | Oil & Gas Operator | Nov 1995 |
| 12522 | Yates Drilling Company | Artesia, NM 88210 | Oil & Gas Operator | Dec 2021 |
| 12523 | Yates Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Dec 2025 |
| 12524 | Yates Industries, LLC | Santa Fe, NM 87501 | Oil & Gas Operator | Dec 2025 |
| 12525 | Yates Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 12526 | Yates, Harvey E. Company | Roswell, NM 88201 | Oil & Gas Operator | Dec 2002 |
| 12527 | Yeates Development Corporation | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 12528 | Yeates, F. L. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 1997 |
| 12529 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |
| 12530 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 12531 | Yellow Rose Oil & Gas Operating | Cisco, TX 76437 | Oil & Gas Operator | Jan 1996 |
| 12532 | Yellowstone Petroleums Inc. | Canada, 00100 | Oil & Gas Operator | Jun 2025 |
| 12533 | Yentzen Investments, Inc. | Sugar Land, TX 77478 | Oil Operator | May 1993 |
| 12534 | Yep, LLC | Palestine, TX 75802 | Oil Operator | Jan 2017 |
| 12535 | Yet Profits, L.L.C. | Wichita Falls, TX 76308 | Oil Operator | Dec 2025 |
| 12536 | Yeti Exploration, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2025 |
| 12537 | Ynew Corporation | Austin, TX 78747 | Oil & Gas Operator | Dec 2025 |
| 12538 | Yobel, Inc. | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 12539 | Yocham Oil And Gas Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 12540 | Yordes Energy, LLC | El Campo, TX 77437 | Oil Operator | Dec 2025 |
| 12541 | York & Price Petroleum Corp. | San Antonio, TX 78218 | Oil & Gas Operator | Jul 2004 |
| 12542 | York E & P, LLC | Boling, TX 77420 | Oil & Gas Operator | Dec 2025 |
| 12543 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 12544 | Young Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1999 |
| 12545 | Young, Clint Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 12546 | Young, John H., Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 12547 | Young, L. M. | Brownwood, TX 76804 | Oil & Gas Operator | Aug 2003 |
| 12548 | Youngblood, C. S. III | Pampa, TX 79065 | Oil & Gas Operator | Dec 2001 |
| 12549 | Younger Energy Company | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 12550 | Yturri, Robert & John | San Antonio, TX 78205 | Oil & Gas Operator | Aug 2003 |
| 12551 | Yturria, Frank D. | Brownsville, TX 78520 | Oil & Gas Operator | Mar 2008 |
| 12552 | Yucca Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 12553 | Yukon Exploration Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2025 |
| 12554 | Yuma E & P Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 12555 | Yuma Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Aug 2002 |
| 12556 | Yust, C. F. & R. L. | Batson, TX 77519 | Oil & Gas Operator | Sep 2002 |
| 12557 | Z&G Operating | Wichita Falls, TX 76302 | Oil Operator | Sep 2011 |
| 12558 | Z/F Little Buddy, L.P. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2000 |
| 12559 | Zachary Oil Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 12560 | Zachris, Inc. | Mansfield, TX 76063 | Oil Operator | Oct 2021 |
| 12561 | Zachry Exploration, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Dec 2025 |
| 12562 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Dec 2025 |
| 12563 | Zachry Exploration, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Jan 2009 |
| 12564 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Dec 2025 |
| 12565 | Zachry Operating | Midland, TX 79708 | Oil & Gas Operator | Jan 2011 |
| 12566 | Zachry, H. B. Company | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1994 |
| 12567 | Zackson Resources, Inc. | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 12568 | Zadeck Energy Group | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 12569 | Zaf Oil | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2002 |
| 12570 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 12571 | Zajac Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Dec 2025 |
| 12572 | Zapata-Fender, L. L. C. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2001 |
| 12573 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 12574 | Zavala Independent Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2007 |
| 12575 | Zaza Energy, LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 12576 | Zebra Oil And Gas | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2002 |
| 12577 | Zebra Oil Company | El Campo, TX 77437 | Oil & Gas Operator | Dec 2025 |
| 12578 | Zelaya Oil And Gas, LLC | Premont, TX 78375 | Oil & Gas Operator | Dec 2025 |
| 12579 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2025 |
| 12580 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2025 |
| 12581 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 12582 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 12583 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 12584 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | Dec 2025 |
| 12585 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 12586 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 12587 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Dec 2025 |
| 12588 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | Dec 2025 |
| 12589 | Zoe Oil & Energy, LP | Fort Worth, TX 76148 | Oil & Gas Operator | Dec 2025 |
| 12590 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jan 2025 |
| 12591 | Zorra Oil & Gas | Dilley, TX 78017 | Oil & Gas Operator | Dec 2025 |
| 12592 | ZSX, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Jul 1997 |
| 12593 | ZTC Petro Investments LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 12594 | ZTH Operating, LLC | Troup, TX 75789 | Oil & Gas Operator | Dec 2025 |
| 12595 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |