| 401 | Elk City Oil Field Service | Elk City, KS 67344 | Oil Operator | Oct 1996 |
| 402 | Elk Energy Corporation | Denver, CO 80218 | Oil & Gas Operator | Mar 2008 |
| 403 | Elk Energy Holdings LLC | Wichita, KS 67226 | Oil & Gas Operator | Feb 2026 |
| 404 | Elk Meadows Resources LLC | Houston, TX 77037 | Oil & Gas Operator | Jan 2021 |
| 405 | Elk Oil Co LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2018 |
| 406 | Elk Oil Company | Overland Park, KS 66212 | Oil & Gas Operator | Sep 2007 |
| 407 | Elk Oil Enterprises, LLC | Wetmore, KS 66550 | Oil Operator | Dec 2009 |
| 408 | Elk Operating Services, LLC | Denver, CO 80203 | Oil & Gas Operator | Apr 2026 |
| 409 | Elk Petroleum Inc | Casper, WY 82601 | Oil & Gas Operator | Aug 2014 |
| 410 | Elk Production LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2011 |
| 411 | Elk Production Uintah LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 412 | Elk Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2011 |
| 413 | Elk River Resources, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | Oct 2023 |
| 414 | Elk San Juan, LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2014 |
| 415 | Elk Slough Pipeline Co. | | Oil & Gas Operator | Dec 1999 |
| 416 | Elkhead Gas & Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 2025 |
| 417 | Elkhorn Oil & Gas, LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 1995 |
| 418 | Elkhound Resources Inc | Wellsville, KS 66092 | Oil Operator | Aug 1998 |
| 419 | Ellard I W | Bixby, OK 74008-0220 | Oil & Gas Operator | Jan 2007 |
| 420 | Ellard Oil | Loving, TX 76460 | Oil & Gas Operator | May 2022 |
| 421 | Ellard, Herman | Graham, TX 76450 | Oil & Gas Operator | Feb 2005 |
| 422 | Ellbogen John P LTD | Casper, WY 82602 | Oil & Gas Operator | Apr 2026 |
| 423 | Ellen P Sharp LLC | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2025 |
| 424 | Ellington Energy, Inc. | Cherry Creek, NY 14723 | Gas Operator | Dec 2024 |
| 425 | Ellinwood Oil Reclaiming Inc | | Oil Operator | Oct 2009 |
| 426 | Ellinwood Tank Service, Inc. | Chase, KS 67524 | Oil Operator | Jul 2022 |
| 427 | Elliott Inc | Roswell, NM 88201 | Oil & Gas Operator | Apr 1962 |
| 428 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 429 | Elliott Oil & Gas Operating Co. | Magnolia, TX 77354 | Oil & Gas Operator | Jun 2026 |
| 430 | Elliott Oil Co | Roswell, NM 88202 | Oil & Gas Operator | Nov 2001 |
| 431 | Elliott Oil Company, L.P. | Magnolia, TX 77354 | Oil & Gas Operator | Jun 2026 |
| 432 | Elliott Phillip | | Oil Operator | Feb 1992 |
| 433 | Elliott Resources Inc | Ada, OK 74820-9227 | Oil & Gas Operator | Jul 2010 |
| 434 | Elliott Underground LLC | | Oil Operator | Mar 2026 |
| 435 | Elliott, Catherine | Waterville, NY 13480 | Gas Operator | Dec 2024 |
| 436 | Elliott, W E & Elliott, W E Jr | Pikeville, KY 41502 | Gas Operator | Dec 2024 |
| 437 | Elliott, W E Et Al | Pikeville, KY 41502 | Gas Operator | Dec 2024 |
| 438 | Ellis Exploration, Inc. | Tyler, TX 75703 | Oil & Gas Operator | Jun 2026 |
| 439 | Ellis M. Moore, Et Al | | Oil Operator | Mar 1986 |
| 440 | Ellis Resources Group Inc | Rhinelander, WI 54501 | Oil Operator | Dec 2025 |
| 441 | Ellis Rolland | Henryetta, OK 74437-0536 | Oil & Gas Operator | Sep 2018 |
| 442 | Ellis, Amon | Olney, TX 76374 | Oil & Gas Operator | Aug 2003 |
| 443 | Ellison Lease Operating | Bridgeport, TX 76426 | Oil & Gas Operator | Jun 2026 |
| 444 | Ellison, Dewitt, Jr. | Aspermont, TX 79502 | Oil & Gas Operator | Mar 2016 |
| 445 | Ellithorp Production LLC | Lindsay, OK 73052-5013 | Oil & Gas Operator | Apr 2019 |
| 446 | Ellora Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2026 |
| 447 | Ellora LLC | Boulder, CO 80308 | Oil & Gas Operator | Feb 2009 |
| 448 | Ellora Operating, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2011 |
| 449 | Ells Jr Harry A | Englewood, CO 80150 | Gas Operator | Feb 2017 |
| 450 | Ellstrom Energy Company | Kingwood, TX 77339 | Oil & Gas Operator | Nov 2000 |
| 451 | Ellsworth Systems, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2005 |
| 452 | Ellsworth, H. P. O&G Properties | Corpus Christ, TX 78413 | Oil & Gas Operator | Jun 2026 |
| 453 | Ellvie Wells LLC | New Franklin, OH 44319 | Oil & Gas Operator | Dec 2025 |
| 454 | Ellwood Exploration LLC | San Antonio, TX 78217 | Oil Operator | Apr 2026 |
| 455 | Elm Creek Oil, LLC | | Oil Operator | Sep 2025 |
| 456 | Elm Grove Production, LLC | Dallas, TX 75360 | Oil & Gas Operator | Jun 2026 |
| 457 | Elm III Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 458 | Elm Ridge Exploration Company | Dallas, TX 75243-9362 | Oil & Gas Operator | Jan 2019 |
| 459 | Elm Ridge Exploration Company LLC | Bloomfield, NM 87413 | Oil & Gas Operator | Nov 2017 |
| 460 | Elm Ridge Resources Inc | Dallas, TX 75243 | Oil & Gas Operator | Nov 2005 |
| 461 | Elmer L. Karst Oil, A General Partnership | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 462 | Elmore Farm | | Oil Operator | Sep 2009 |
| 463 | Elmore Production Services Inc | | Oil & Gas Operator | Dec 2008 |
| 464 | Elmore Stanley G | Bartlesville, OK 74006-1741 | Oil & Gas Operator | Sep 2023 |
| 465 | Elmore, John A. And Patricia R. | Sedan, KS 67361 | Oil Operator | Feb 2026 |
| 466 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2026 |
| 467 | Elmtree Oil Co Inc | Bartlesville, OK 74006-1819 | Oil Operator | May 2021 |
| 468 | Elmwood Operating LLC | | Oil & Gas Operator | Jun 2024 |
| 469 | Elp Production Company LLC | Dallas, TX 75287 | Oil Operator | Jun 2026 |
| 470 | Elsaan Energy LLC | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2023 |
| 471 | Elsbury & Acker | | Oil & Gas Operator | Feb 2003 |
| 472 | Elsbury & McGrew | | Oil & Gas Operator | Nov 1986 |
| 473 | Elson Oil Company | Tulsa, OK 74103-4429 | Oil & Gas Operator | Dec 2016 |
| 474 | Elvera Stiles Trust | Broken Arrow, OK 74011 | Oil & Gas Operator | Feb 2026 |
| 475 | Elvis Energy, LLC | Philippi, WV 26416 | Gas Operator | Dec 2021 |
| 476 | Elwell, Mike | Lawrence, KS 66044 | Oil Operator | Dec 2009 |
| 477 | Elysium Energy, L.L.C | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 478 | Elysium Jennings, LLC | | Oil & Gas Operator | Dec 2024 |
| 479 | Em Energy Ohio LLC | Canonsburg, PA 15317 | Oil & Gas Operator | Sep 2019 |
| 480 | Em Energy Pa LLC | Canonsburg, PA 15317-5860 | Oil & Gas Operator | Jun 2020 |
| 481 | Em-Gee Oil Account | Jacksonville, TX 75766 | Oil & Gas Operator | Sep 1995 |
| 482 | Emax Oil Company | Charlottesville, VA 22903-4973 | Oil & Gas Operator | Dec 2016 |
| 483 | Embassy Energy Inc. | Akron, OH 44333-8357 | Oil & Gas Operator | Dec 2025 |
| 484 | Embassy Oil Company | Highland VLG, TX 75077 | Oil & Gas Operator | Jun 2026 |
| 485 | Embassy Well Service, LLC | Carrollton, TX 75011 | Oil & Gas Operator | Jun 2026 |
| 486 | Embrey Oil Production Co. | Sutherlnd SPG, TX 78161 | Oil & Gas Operator | Oct 2021 |
| 487 | Embry Solutions, Inc. | Dallas, TX 75315 | Oil Operator | Jun 2026 |
| 488 | Emc Energies Inc | Casper, WY 82604 | Oil Operator | May 1989 |
| 489 | Emc Energy | | Oil & Gas Operator | Jun 1985 |
| 490 | Emc Exploration Company Inc | Oklahoma City, OK 73103-3775 | Oil & Gas Operator | Jul 2007 |
| 491 | Emc Properties, LLC | Clinton, MO 64735 | Oil Operator | Dec 2019 |
| 492 | Emco Energy, Inc. | Stephenson, VA 22656 | Gas Operator | Dec 2018 |
| 493 | Emco Oil & Gas | Graham, TX 76450 | Oil & Gas Operator | Dec 1995 |
| 494 | Emco Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2002 |
| 495 | Emde & McNeil | Carney, OK 74832 | Oil & Gas Operator | Nov 1998 |
| 496 | Eme Wyoming LLC | Lakewood, CO 80401 | Oil & Gas Operator | Mar 2026 |
| 497 | Emep II Operating LLC | | Oil & Gas Operator | Apr 2026 |
| 498 | Emerald Bay Energy, Inc. | San Antonio, TX 78230 | Oil Operator | Jun 2026 |
| 499 | Emerald Gas Operating Co | Durango, CO 81301 | Gas Operator | Aug 1996 |
| 500 | Emerald Gather And Trans, LLC | Cypress, TX 77429 | Oil & Gas Operator | Jun 2026 |