| 401 | Kenneco Incorpor | | Oil Operator | Sep 1984 |
| 402 | Kennedy & Mitche | | Oil & Gas Operator | May 1990 |
| 403 | Kennedy & Mitchell | Woodward, OK 73802 | Oil & Gas Operator | Dec 1988 |
| 404 | Kennedy & Mitchell, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2013 |
| 405 | Kennedy And Bacheller | | Oil & Gas Operator | Apr 1989 |
| 406 | Kennedy George C | Upton, WY 82730 | Oil & Gas Operator | Oct 2018 |
| 407 | Kennedy Oil | Gillette, WY 82716 | Oil & Gas Operator | May 2026 |
| 408 | Kennedy, Billy N | | Oil & Gas Operator | Dec 2019 |
| 409 | Kennedy, Howard E | | Oil & Gas Operator | May 1997 |
| 410 | Kennedy, Joseph D. | Stephenville, TX 76401 | Oil & Gas Operator | Jun 1995 |
| 411 | Kennedy, R. R. Production, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Jul 2026 |
| 412 | Kennedy, Tracy J | | Oil Operator | Apr 2026 |
| 413 | Kennemer, Darrell | Boyd, TX 76023 | Oil Operator | Jul 2026 |
| 414 | Kenneth & Regina Laymon, LLC | Neosho Falls, KS 66758 | Oil Operator | Dec 2019 |
| 415 | Kenneth D Luff | | Oil & Gas Operator | Dec 1983 |
| 416 | Kenneth Darnell | | Oil Operator | Jan 2025 |
| 417 | Kenneth H. Hunter Jr. | | Oil & Gas Operator | Dec 1991 |
| 418 | Kenneth H. Hunter Jr. Trustee Of The Hunter Living Trust | | Oil & Gas Operator | Dec 2001 |
| 419 | Kenneth Lopez And Conway Lopez | | Oil & Gas Operator | Dec 2025 |
| 420 | Kenneth Sperry | | Oil & Gas Operator | Dec 1992 |
| 421 | Kenneth W Cory LTD | Bellaire, TX 77401 | Oil & Gas Operator | May 2026 |
| 422 | Kenny Brown Enterprises LLC | Hays, KS 67601 | Oil Operator | Jul 2013 |
| 423 | Keno Oil & Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jan 1995 |
| 424 | Kenoil LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 425 | Kenson Operating Company Inc | Houston, TX 77002 | Oil & Gas Operator | Sep 2002 |
| 426 | Kent Oil Corporation | Blanchard, OK 73010-3619 | Oil & Gas Operator | Feb 2012 |
| 427 | Kent Resources Corp. | | Oil Operator | Dec 1983 |
| 428 | Kent Walker | Midland, TX 79708 | Oil & Gas Operator | Sep 1999 |
| 429 | Kent, Cameron J | Garnett, KS 66032 | Oil Operator | Mar 2026 |
| 430 | Kent, Charles Operating Co. Inc. | Powell, TX 75153 | Oil & Gas Operator | Dec 2007 |
| 431 | Kent, Jennette M. | Great Valley, NY 14741 | Gas Operator | Dec 2025 |
| 432 | Kent, Kristin H. | Eden, NY 14057 | Gas Operator | Dec 2025 |
| 433 | Kent, VInce J | Garnett, KS 66032 | Oil Operator | Oct 2002 |
| 434 | Kentex Worland LLC | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 435 | Kentex Worland Operating Co LLC | | Oil & Gas Operator | Jun 2026 |
| 436 | Kentry Oil Company | Kingston, OK 73439 | Oil Operator | Aug 2002 |
| 437 | Kentta & Drwenski | Casper, WY 82602 | Oil & Gas Operator | Nov 1995 |
| 438 | Kentucky Energy Group LLC | Phelps, KY 41553 | Gas Operator | Dec 2024 |
| 439 | Kentucky Exploration LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2014 |
| 440 | Kentucky Gas Development, LLC | | Oil & Gas Operator | Dec 2020 |
| 441 | Kentucky Processing Plant, LLC | | Oil & Gas Operator | Dec 2024 |
| 442 | Kentucky River Oil & Gas, LLC | | Oil Operator | Dec 2024 |
| 443 | Kenworthy Oil Company | Midland, TX 79710 | Oil & Gas Operator | Jul 2026 |
| 444 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 445 | Kep Exploration Inc | | Oil & Gas Operator | Feb 1991 |
| 446 | Kep Exploration Inc And Haggard Ward M | | Oil & Gas Operator | Dec 1986 |
| 447 | Kepa Energy, L.C. | Marshall, TX 75670 | Oil & Gas Operator | Mar 1998 |
| 448 | Kepasa Corp | Oklahoma City, OK 73106 | Oil & Gas Operator | Apr 2026 |
| 449 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 450 | Kepco. Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 451 | Kephart Drilling, Inc. | Thayer, KS 66776 | Oil & Gas Operator | Dec 2008 |
| 452 | Kepley Brothers | Chanute, KS 66720 | Oil Operator | Sep 1992 |
| 453 | Kepley Well Service, LLC | Chanute, KS 66720 | Oil Operator | Mar 2025 |
| 454 | Kepley, L.F. | Wichita, KS 67204 | Oil Operator | Feb 1986 |
| 455 | Kepley, William Samuel | Chanute, KS 66720 | Oil Operator | Nov 2024 |
| 456 | Kera-Oil | Great Bend, KS 67530 | Oil Operator | Dec 2009 |
| 457 | Kern Co. | Houston, TX 77095 | Oil & Gas Operator | Jan 2021 |
| 458 | Kern Front-Section 35-Partners | | Oil & Gas Operator | Dec 2025 |
| 459 | Kern River Holdings II LLC | | Oil & Gas Operator | May 2026 |
| 460 | Kernodle Bros. Oil & Gas, General Partnership | Raytown, MO 64133 | Oil Operator | Jun 2018 |
| 461 | Kerns Larry Dba Kerns Oil | Dewey, OK 74029-2457 | Oil Operator | Nov 2017 |
| 462 | Kerns O & G, Inc. | San Antonio, TX 78232 | Oil & Gas Operator | Dec 2004 |
| 463 | Kerns Petroleum, Inc. | San Antonio, TX 78257 | Oil & Gas Operator | Sep 2013 |
| 464 | Kernview Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 465 | Kerogen Resources | Gratiot, OH 43740 | Oil & Gas Operator | Dec 2004 |
| 466 | Kerogen Texas Energy Op LLC | Houston, TX 77060 | Oil & Gas Operator | Feb 2018 |
| 467 | Kerpoe Stanley J | Tonawanda, NY 14150-8114 | Oil & Gas Operator | Dec 1989 |
| 468 | Kerr McGee Chem Corp | | Gas Operator | Dec 1989 |
| 469 | Kerr McGee Rocky MTN Corp | Denver, CO 80202-5736 | Oil & Gas Operator | Mar 2015 |
| 470 | Kerr Oil, LLC | Iola, KS 66749 | Oil Operator | Dec 2009 |
| 471 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 472 | Kerr-McGee Oil & Gas Corp. | Houston, TX 77251 | Oil & Gas Operator | Sep 2006 |
| 473 | Kerr-McGee Oil & Gas Onshore LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2017 |
| 474 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2026 |
| 475 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 476 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 477 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 478 | Kerry Oil & Gas, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jan 2004 |
| 479 | Kerry Petroleum Co Inc | Midland, TX 79708 | Oil & Gas Operator | Jun 2010 |
| 480 | Kersey & Company | Ellijay, GA 30540 | Oil & Gas Operator | Jan 2023 |
| 481 | Kestrel Energy Inc | Lakewood, CO 80401 | Oil & Gas Operator | Jan 2008 |
| 482 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Sep 2015 |
| 483 | Ketcham VIctor A | Columbus, OH 43214 | Oil Operator | Dec 2021 |
| 484 | Kettlebrook Energy, Inc. | Westfield, NY 14787 | Gas Operator | Dec 2025 |
| 485 | Kevin O Butler & Assoc Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 486 | Kewanee Oil Comp | | Oil & Gas Operator | Nov 1996 |
| 487 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 488 | Key Energy Corporation | Enid, OK 73702-5349 | Oil & Gas Operator | Oct 2017 |
| 489 | Key Energy Of Colorado, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2016 |
| 490 | Key Energy Services Inc | Midland, TX 79705-5540 | Oil Operator | Jan 2008 |
| 491 | Key Energy Services, Inc.Altd | | Oil Operator | Dec 2006 |
| 492 | Key Energy Services, LLC | Houston, TX 77042 | Oil Operator | Jan 2025 |
| 493 | Key Gas Corp. | Wichita, KS 67202 | Oil & Gas Operator | Nov 2018 |
| 494 | Key Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Dec 2021 |
| 495 | Key Operating & Equipment, Inc. | Midlothian, TX 76065 | Oil & Gas Operator | Nov 2024 |
| 496 | Key Operating Company Inc | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 497 | Key Petroleum Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 2003 |
| 498 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2026 |
| 499 | Key, J. J. | Lubbock, TX 79416 | Oil & Gas Operator | Jul 2026 |
| 500 | Keybank National Association, Trustee | Brooklyn, OH 44144 | Gas Operator | Dec 2025 |