| 401 | Evantech Energy Corp. | Fort Worth, TX 76120 | Oil & Gas Operator | Apr 1995 |
| 402 | Evarado Oil Company | Strawn, TX 76475 | Oil & Gas Operator | Jun 2026 |
| 403 | Evarado Oil, LLC | Strawn, TX 76475 | Oil & Gas Operator | Jun 2026 |
| 404 | Evc Operating, LLC | McKinney, TX 75069 | Oil & Gas Operator | May 2000 |
| 405 | Everest Minerals Corp. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2001 |
| 406 | Everest Network LLC | Eastland, TX 76448 | Oil & Gas Operator | Jun 2026 |
| 407 | Everest Resource Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jun 2026 |
| 408 | Everett Oil | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2015 |
| 409 | Everett Oil, Inc. | San Antonio, TX 78258 | Oil Operator | Jun 2026 |
| 410 | Everett, Joe Mack | Throckmorton, TX 76483 | Oil & Gas Operator | Jun 2026 |
| 411 | Evergreen Energy, Inc | Houston, TX 77098 | Oil & Gas Operator | Jun 2026 |
| 412 | Evergreen Operating Co., LTD. | McAllen, TX 78502 | Oil & Gas Operator | Jun 2026 |
| 413 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 414 | Everquest Energy Corporation | Fredericksbrg, TX 78624 | Oil & Gas Operator | Sep 2025 |
| 415 | Evinger, Ernest E. | Midland, TX 79705 | Oil & Gas Operator | Mar 2002 |
| 416 | Evolution Operating Co., Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 2026 |
| 417 | Evolution Resources, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2026 |
| 418 | Ewt Operating Company | Andrews, TX 79714 | Oil & Gas Operator | Jun 2026 |
| 419 | Ex-Cel Resources, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2026 |
| 420 | Exaro Energy II, LLC | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 421 | Excalibur E & P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Jun 2026 |
| 422 | Exceed Petroleum LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2026 |
| 423 | Excel Energy Co. | Coahoma, TX 79511 | Oil & Gas Operator | Jan 2026 |
| 424 | Excel Energy, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Jun 2026 |
| 425 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Jun 2026 |
| 426 | Excelco Energy Inc. | Kingwood, TX 77339 | Oil & Gas Operator | Jul 2018 |
| 427 | Exchange Avenue Production Co. | Weatherford, TX 76086 | Oil & Gas Operator | Sep 2021 |
| 428 | Exchange Exploration & Production Co. | Dallas, TX 75219 | Oil & Gas Operator | Dec 2025 |
| 429 | Exchange Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1987 |
| 430 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Jun 2026 |
| 431 | Exco Partners Operating PTSHP LP | Dallas, TX 75251 | Oil & Gas Operator | Jan 2009 |
| 432 | Exco Production Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2009 |
| 433 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 434 | Exco/Hgi JV Assets, LLC | Dallas, TX 75251 | Oil & Gas Operator | Jun 2014 |
| 435 | Executive Production, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Jun 2026 |
| 436 | Exit Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Jun 2026 |
| 437 | Exl Petroleum Operating Inc. | Midland, TX 79705 | Oil & Gas Operator | Feb 2020 |
| 438 | Exl Petroleum, LP | Midland, TX 79705 | Oil & Gas Operator | Jun 2017 |
| 439 | Exlco, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 440 | Exmoor Oil & Minerals Corp. | Dallas, TX 75225 | Oil & Gas Operator | May 1994 |
| 441 | Exodus Energy, Inc. | Huntington Beach, CA 92615 | Oil & Gas Operator | Jul 2018 |
| 442 | Exok Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2026 |
| 443 | Exorare Energy, Inc. | Dallas, TX 75218 | Oil & Gas Operator | Jun 2026 |
| 444 | Exotic Oil & Gas LLC | Indiana, PA 15701-3634 | Oil & Gas Operator | Dec 2025 |
| 445 | Exp, Inc. | Dallas, TX 75244 | Oil & Gas Operator | May 2003 |
| 446 | Expand Oper LLC | Morgantown, WV 26508 | Oil & Gas Operator | Mar 2026 |
| 447 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 448 | Explo Oil, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Jun 2026 |
| 449 | Exploration Company, The | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2010 |
| 450 | Exploration Techniques Inc. | Houston, TX 77027 | Oil & Gas Operator | Jun 2026 |
| 451 | Export Petroleum Corporation | Fort Worth, TX 76147 | Oil & Gas Operator | Jun 2026 |
| 452 | Express Energy Group, LLC | Atlanta, TX 75551 | Oil & Gas Operator | Jun 2026 |
| 453 | Express Oil And Gas | La Grange, TX 78945 | Oil & Gas Operator | Jun 2026 |
| 454 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | Jun 2026 |
| 455 | Expro Engineering, Inc. | Fort Worth, TX 76179 | Oil & Gas Operator | Jun 2026 |
| 456 | Extech Operating, LLC | Fort Worth, TX 76147 | Oil & Gas Operator | Jun 2026 |
| 457 | Extenergy, L.P. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 458 | Extex Operating Company | Houston, TX 77057 | Oil & Gas Operator | Jun 2026 |
| 459 | Exxcel Production Company | Pampa, TX 79066 | Oil & Gas Operator | Jun 2026 |
| 460 | Exxon Corp. - Midland | Houston, TX 77210 | Gas Operator | Jul 1997 |
| 461 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jan 2026 |
| 462 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 463 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2026 |
| 464 | Exzena Oil Corp. | Tyler, TX 75713 | Oil & Gas Operator | Jun 2026 |
| 465 | Eylau Oil Inc. | Atlanta, TX 75551 | Oil & Gas Operator | Oct 2021 |