| 501 | Emerald Oil & Gas LC | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2026 |
| 502 | Emerald Oil Co. | | Oil & Gas Operator | Apr 1980 |
| 503 | Emerald Oil Company, L.L.C. | E. Rochester, NY 14445 | Oil & Gas Operator | Jan 2025 |
| 504 | Emerald Oil, Inc | | Oil & Gas Operator | Dec 2016 |
| 505 | Emerald Operating Company | Plano, TX 75075 | Oil & Gas Operator | Mar 2026 |
| 506 | Emerald Petroleum Corporation | Dallas, TX 75244 | Oil & Gas Operator | Apr 2002 |
| 507 | Emerald Production Company | Midland, TX 79702 | Oil & Gas Operator | Jun 1995 |
| 508 | Emerald Restoration & Prod | Gillette, WY 82718 | Oil & Gas Operator | Jul 2000 |
| 509 | Emerge Operating, LLC | | Oil & Gas Operator | Feb 2026 |
| 510 | Emerson Oil Company | Rindge, NH 03461 | Oil & Gas Operator | Feb 2008 |
| 511 | Emerson, Jim | Plano, TX 75074 | Oil & Gas Operator | Jan 1995 |
| 512 | Emery Billie E | Skiatook, OK 74070 | Oil Operator | Mar 2026 |
| 513 | Emery Edward A | Tulsa, OK 74145-7921 | Oil Operator | Mar 2026 |
| 514 | Emery Energy, Inc. | | Oil Operator | Dec 1984 |
| 515 | Emery Resource Holdings LLC | Scottsdale, AZ 85260 | Gas Operator | Apr 2026 |
| 516 | Emil & Ruby Plegel | | Oil Operator | Dec 1989 |
| 517 | Emil W. Plegel | | Oil & Gas Operator | Dec 2025 |
| 518 | Eminent Oil & Gas, Inc. | Houston, TX 77077 | Oil & Gas Operator | Jun 2026 |
| 519 | Emjayco L. P. | | Oil Operator | Dec 2020 |
| 520 | Emjo Operations Inc | Marlow, OK 73055-8803 | Oil & Gas Operator | Mar 2026 |
| 521 | Emke, Diane M. | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 522 | Emkey Companies, LLC | Dallas, TX 75251 | Oil & Gas Operator | May 2016 |
| 523 | Emlou Oil Co. | Atascosa, TX 78002 | Oil & Gas Operator | Jul 2011 |
| 524 | Emmert Leo R | Marblehead, OH 43440 | Oil & Gas Operator | Dec 2004 |
| 525 | Emo Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Apr 2020 |
| 526 | Empire Energies | Sheridan, NY 14135 | Gas Operator | Dec 2024 |
| 527 | Empire Energy E & P, LLC | Mayville, NY 14757 | Oil & Gas Operator | Mar 2019 |
| 528 | Empire Explorati | | Oil Operator | Dec 1996 |
| 529 | Empire Exploration Corp. 1989 | Lebanon, MO 65536 | Oil & Gas Operator | Mar 2003 |
| 530 | Empire Exploration Inc | Wichita, KS 67202 | Oil & Gas Operator | Jul 1997 |
| 531 | Empire Land Corporation | New Orleans, LA 70130 | Oil & Gas Operator | Nov 2014 |
| 532 | Empire Louisiana LLC Of Delaware | | Oil & Gas Operator | Dec 2024 |
| 533 | Empire New Mexico LLC | Tulsa, OK 74114 | Oil & Gas Operator | Mar 2026 |
| 534 | Empire North Dakota LLC | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2026 |
| 535 | Empire Oil & Gas Co. | New Braunfels, TX 78132 | Oil & Gas Operator | Dec 2017 |
| 536 | Empire Oil & Gas, Inc. | Harrisville, WV 26362 | Oil & Gas Operator | Dec 2021 |
| 537 | Empire Oil Company | Coppell, TX 75019 | Oil & Gas Operator | Jun 2026 |
| 538 | Empire Oil Of New Jersey | Post, TX 79356 | Oil & Gas Operator | Jan 1999 |
| 539 | Empire Operating, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Mar 2017 |
| 540 | Empire Petroleum Company | Houston, TX 77044 | Oil Operator | Mar 2011 |
| 541 | Empire Petroleum Corporation | Tulsa, OK 74137 | Oil & Gas Operator | Dec 2005 |
| 542 | Empire Petroleum LLC | Cottonwood Heights, UT 84121 | Oil & Gas Operator | Jun 2019 |
| 543 | Empire Texas Operating LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2026 |
| 544 | Empresa Energy IV, LLC | | Oil & Gas Operator | Aug 2019 |
| 545 | Empresa Energy, LP | Houston, TX 77024 | Oil & Gas Operator | Jul 2009 |
| 546 | Empresa Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 547 | Emre Oil LLC | Moorcroft, WY 82721 | Oil Operator | Mar 2026 |
| 548 | En Geo, Inc. | Richardson, TX 75081 | Oil & Gas Operator | Jun 2026 |
| 549 | En/Drill America, Inc. | Crystal, MN 55428 | Oil & Gas Operator | Apr 2009 |
| 550 | Enable Gas Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 551 | Enable Midstream Partners, LP | Oklahoma City, OK 73124 | Oil Operator | Sep 2023 |
| 552 | Enable Oklahoma Intrastate Transmission LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 553 | Enbridge G & P (East Texas) L.P. | Houston, TX 77056 | Oil & Gas Operator | Sep 2018 |
| 554 | Enbridge Offshore Pipelines(Seacrest) LP | | Oil Operator | Oct 2009 |
| 555 | Enbridge P/LS (La Intra.)L.L.C. | | Oil Operator | Oct 2009 |
| 556 | Enbridge Pipelines (Ne Texas) LP | Houston, TX 77002 | Oil & Gas Operator | Jan 2010 |
| 557 | Encana Energy Resources Inc | Denver, CO 80202-2828 | Oil & Gas Operator | Feb 2024 |
| 558 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 559 | Encina Resources, LLC | Houston, TX 77251 | Oil & Gas Operator | Jun 2026 |
| 560 | Encino Exploration, Inc. | George West, TX 78022 | Oil & Gas Operator | Jun 2026 |
| 561 | Encino Operating, LLC | Houston, TX 77008 | Oil & Gas Operator | Jun 2026 |
| 562 | Enclave Operating, LLC | Shelby, MT 59474 | Oil & Gas Operator | May 2014 |
| 563 | Enco Exploration Company | Corpus Christ, TX 78401 | Oil & Gas Operator | Apr 2020 |
| 564 | Enco Resources Inc. | Kingwood, TX 77325 | Oil & Gas Operator | Jun 2026 |
| 565 | Encon Services, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jun 2026 |
| 566 | Encore Energy Partners Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Apr 2015 |
| 567 | Encore Energy, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 568 | Encore Operating Company | Denver, CO 80227 | Oil & Gas Operator | Dec 2019 |
| 569 | Encore Operating Inc | Edmond, OK 73013-5417 | Oil Operator | Feb 2026 |
| 570 | Encore Operating Kentucky LLC | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2023 |
| 571 | Encore Operating Louisiana, LLC | | Oil & Gas Operator | Dec 2010 |
| 572 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Mar 2026 |
| 573 | Encore Permian Operating, LLC | Uvalde, TX 78801 | Oil & Gas Operator | Jun 2026 |
| 574 | Encorp, Inc. | Wichita, KS 67206 | Oil Operator | May 2007 |
| 575 | Encrescent, LLC | Dallas, TX 75205 | Oil & Gas Operator | Jun 2026 |
| 576 | Enczi Frank | Junction City, OH 43748 | Oil & Gas Operator | Dec 2016 |
| 577 | End Of The Trails Re | | Oil Operator | Feb 2026 |
| 578 | Endeavor Drilling, Inc. | Wagoner, OK 74467 | Oil Operator | Feb 2026 |
| 579 | Endeavor Energy LLC | | Oil Operator | Sep 2023 |
| 580 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 581 | Endeavor Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2015 |
| 582 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 583 | Endeavor Production Company | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 584 | Endeavour Operating Corp | Denver, CO 80202-2000 | Gas Operator | Jun 2014 |
| 585 | Enderli Oil Company, Inc | Highlands, TX 77562 | Oil & Gas Operator | Aug 2003 |
| 586 | Endevco Eureka LLC | Oklahoma City, OK 73102-9211 | Oil & Gas Operator | Apr 2014 |
| 587 | Endicott Melvin F | Ponca City, OK 74601 | Oil & Gas Operator | Apr 2001 |
| 588 | Endura Energy LLC | Lubbock, TX 79464 | Oil & Gas Operator | Jan 2025 |
| 589 | Endurance Oil & Gas, Inc. | Minden, LA 71055 | Oil & Gas Operator | Jun 2026 |
| 590 | Endurance Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 591 | Endurance Resources LLC | Addison, TX 75001 | Oil & Gas Operator | Apr 2017 |
| 592 | Enduring Resources, LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Apr 2026 |
| 593 | Enduro Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2018 |
| 594 | Enercap Corporation | Kingwood, TX 77325 | Oil & Gas Operator | Aug 2003 |
| 595 | Enerco Energy Corporation | Norman, OK 73069-6643 | Oil & Gas Operator | Apr 2020 |
| 596 | Enerco Exploration & MGMT. Co. | | Oil & Gas Operator | Aug 1981 |
| 597 | Enerco Operating Corporation | Dallas, TX 75240 | Oil & Gas Operator | Jan 2025 |
| 598 | Enercorp Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | Dec 1993 |
| 599 | Enerdril Corporation | Moran, TX 76464 | Gas Operator | Dec 2015 |
| 600 | Enerdyne, LLC | Albuquerque, NM 87123 | Oil & Gas Operator | Feb 2026 |