| 12401 | Yegen E C | Casper, WY 82604 | Oil & Gas Operator | Mar 2015 |
| 12402 | Yellow Rose Energy, Inc. | Cottonwood Falls, KS 66845 | Gas Operator | Oct 1999 |
| 12403 | Yellow Rose Oil & Gas Oper. Inc. | Cisco, TX 76437 | Oil & Gas Operator | Jul 2025 |
| 12404 | Yellow Rose Oil & Gas Operating | Cisco, TX 76437 | Oil & Gas Operator | Jan 1996 |
| 12405 | Yellowstone Petroleums Inc. | Canada, 00100 | Oil & Gas Operator | Feb 2025 |
| 12406 | Yentzen Investments, Inc. | Sugar Land, TX 77478 | Oil Operator | May 1993 |
| 12407 | Yep, LLC | Palestine, TX 75802 | Oil Operator | Jan 2017 |
| 12408 | Yet Profits, L.L.C. | Wichita Falls, TX 76308 | Oil Operator | Jul 2025 |
| 12409 | Yeti Exploration, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jul 2025 |
| 12410 | Ynew Corporation | Austin, TX 78747 | Oil & Gas Operator | Jul 2025 |
| 12411 | Yobel, Inc. | Olney, TX 76374 | Oil & Gas Operator | Jul 2025 |
| 12412 | Yocham Oil And Gas Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 12413 | Yordes Energy, LLC | El Campo, TX 77437 | Oil Operator | Jul 2025 |
| 12414 | York & Price Petroleum Corp. | San Antonio, TX 78218 | Oil & Gas Operator | Jul 2004 |
| 12415 | York E & P, LLC | Boling, TX 77420 | Oil & Gas Operator | Jul 2025 |
| 12416 | Young Marshall R Oil Co | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2011 |
| 12417 | Young Oil Corporation | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 12418 | Young Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 1999 |
| 12419 | Young, Clint Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 12420 | Young, John H., Inc. | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 12421 | Young, L. M. | Brownwood, TX 76804 | Oil & Gas Operator | Aug 2003 |
| 12422 | Youngblood, C. S. III | Pampa, TX 79065 | Oil & Gas Operator | Dec 2001 |
| 12423 | Younger Energy Company | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 12424 | Yturri, Robert & John | San Antonio, TX 78205 | Oil & Gas Operator | Aug 2003 |
| 12425 | Yturria, Frank D. | Brownsville, TX 78520 | Oil & Gas Operator | Mar 2008 |
| 12426 | Yucca Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 12427 | Yukon Exploration Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jul 2025 |
| 12428 | Yuma E & P Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 12429 | Yuma Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Aug 2002 |
| 12430 | Yust, C. F. & R. L. | Batson, TX 77519 | Oil & Gas Operator | Sep 2002 |
| 12431 | Z&G Operating | Wichita Falls, TX 76302 | Oil Operator | Sep 2011 |
| 12432 | Z/F Little Buddy, L.P. | Tyler, TX 75710 | Oil & Gas Operator | Sep 2000 |
| 12433 | Zachary Oil Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2023 |
| 12434 | Zachris, Inc. | Mansfield, TX 76063 | Oil Operator | Oct 2021 |
| 12435 | Zachry Exploration, Inc. | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2025 |
| 12436 | Zachry Exploration, LLC | San Antonio, TX 78224 | Oil & Gas Operator | Jul 2025 |
| 12437 | Zachry Exploration, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Jan 2009 |
| 12438 | Zachry Oil And Gas Properties | Midland, TX 79708 | Oil & Gas Operator | Jul 2025 |
| 12439 | Zachry Operating | Midland, TX 79708 | Oil & Gas Operator | Jan 2011 |
| 12440 | Zachry, H. B. Company | San Antonio, TX 78205 | Oil & Gas Operator | Apr 1994 |
| 12441 | Zackson Resources, Inc. | Houston, TX 77063 | Oil & Gas Operator | Jul 2025 |
| 12442 | Zadeck Energy Group | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2011 |
| 12443 | Zaf Oil | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2002 |
| 12444 | Zagava, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 12445 | Zajac Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Jul 2025 |
| 12446 | Zapata-Fender, L. L. C. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2001 |
| 12447 | Zarvona Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 12448 | Zavala Independent Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Oct 2007 |
| 12449 | Zaza Energy, LLC | Houston, TX 77010 | Oil & Gas Operator | Jul 2025 |
| 12450 | Zebra Oil And Gas | Lubbock, TX 79423 | Oil & Gas Operator | Aug 2002 |
| 12451 | Zebra Oil Company | El Campo, TX 77437 | Oil & Gas Operator | Jul 2025 |
| 12452 | Zelaya Oil And Gas, LLC | Premont, TX 78375 | Oil & Gas Operator | Jul 2025 |
| 12453 | Zenergy Inc | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 12454 | Zenith Oil & Gas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 12455 | Zephyr Lone Star Oper Co.,L.L.C. | Oklahoma City, OK 73118 | Oil & Gas Operator | Jul 2025 |
| 12456 | Ziegler-Peru, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 2019 |
| 12457 | Zilkha Energy Company | Houston, TX 77046 | Oil & Gas Operator | Oct 2002 |
| 12458 | Zingara Grimes, LLC | Dallas, TX 75205 | Oil & Gas Operator | Jul 2025 |
| 12459 | Zinke & Trumbo, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2007 |
| 12460 | Zinn Petroleum Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2021 |
| 12461 | Zivney Energy | White Oak, TX 75693 | Oil & Gas Operator | Jul 2025 |
| 12462 | ZK Petroleum Co., L.L.C. | Houston, TX 77057 | Oil Operator | Jul 2025 |
| 12463 | Zoe Oil & Energy, LP | Fort Worth, TX 76148 | Oil & Gas Operator | Jul 2025 |
| 12464 | Zone Energy, LLC | Houston, TX 77251 | Oil & Gas Operator | Jan 2025 |
| 12465 | Zorra Oil & Gas | Dilley, TX 78017 | Oil & Gas Operator | Jul 2025 |
| 12466 | ZSX, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Jul 1997 |
| 12467 | ZTC Petro Investments LP | Houston, TX 77056 | Oil & Gas Operator | May 2020 |
| 12468 | ZTH Operating, LLC | Troup, TX 75789 | Oil & Gas Operator | Jul 2025 |
| 12469 | Zzron Inc. | Midland, TX 79704 | Oil & Gas Operator | Aug 2003 |