| 2501 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Feb 2026 |
| 2502 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |
| 2503 | Kauthar Energy Co., Inc. | | Oil & Gas Operator | Dec 2002 |
| 2504 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 2505 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 2506 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 2507 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 2508 | Keba Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2015 |
| 2509 | Kecco, Inc. | | Oil Operator | May 2002 |
| 2510 | Keck Partners | | Oil & Gas Operator | Apr 1989 |
| 2511 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 2512 | Keith W. Burton | | Oil & Gas Operator | Jan 2025 |
| 2513 | Kele Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 2514 | Kelley Oil & Sugar Creek Prod. | | Oil & Gas Operator | Oct 1992 |
| 2515 | Kelley Oil Corp/Yuma Petroleum | | Gas Operator | Jun 1994 |
| 2516 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 2517 | Kelley Operating Company, LTD. | | Oil & Gas Operator | Aug 2003 |
| 2518 | Kelly Bayou Production | | Oil & Gas Operator | Jan 2025 |
| 2519 | Kelly H Baxter | Austin, TX 78767 | Oil & Gas Operator | Nov 2006 |
| 2520 | Kelly Oil Co Inc | | Oil & Gas Operator | Sep 2013 |
| 2521 | Kem Ventures, LP | Katy, TX 77450 | Oil & Gas Operator | Dec 2025 |
| 2522 | Kenergy Petroleum Corp | | Oil & Gas Operator | Dec 1982 |
| 2523 | Kenergy-Wainoco | | Oil & Gas Operator | Mar 1981 |
| 2524 | Kennedy And Bacheller | | Oil & Gas Operator | Apr 1989 |
| 2525 | Kenneth Darnell | | Oil Operator | Jan 2025 |
| 2526 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2025 |
| 2527 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Sep 2025 |
| 2528 | Kerr-McGee Oil & Gas Corp. | Houston, TX 77251 | Oil & Gas Operator | Sep 2006 |
| 2529 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 2530 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 2531 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 2532 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Sep 2015 |
| 2533 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 2534 | Key Energy Of Colorado, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2016 |
| 2535 | Key Energy Services, Inc.Altd | | Oil Operator | Dec 2006 |
| 2536 | Key Energy Services, LLC | Houston, TX 77042 | Oil Operator | Jan 2025 |
| 2537 | Key Operating Company Inc | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 2538 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Nov 2025 |
| 2539 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Feb 2026 |
| 2540 | Keystone Fuel Oil Co | | Gas Operator | Nov 1997 |
| 2541 | Keystone Operating Co. | Round Rock, TX 78681 | Oil & Gas Operator | Feb 2026 |
| 2542 | Keystone Productions, LLC | | Gas Operator | Dec 2024 |
| 2543 | KFG Petroleum Corporation | | Oil & Gas Operator | Dec 2025 |
| 2544 | KFS Investments, L.L.C. | | Oil & Gas Operator | Jul 2009 |
| 2545 | Kilco, Inc. | | Gas Operator | Sep 1996 |
| 2546 | Killingsworth Oil Co. | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 2547 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2026 |
| 2548 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 2549 | Kilroy Co.- E.L. Cox | | Oil & Gas Operator | Aug 1990 |
| 2550 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 2551 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 2552 | Kimco Energy Corporation | | Oil & Gas Operator | Apr 1989 |
| 2553 | Kindee Oil & Gas Louisiana, LLC | | Oil & Gas Operator | Aug 2012 |
| 2554 | Kinder Gas Inc | | Oil Operator | Dec 2011 |
| 2555 | Kinder Morgan Treating LP | | Oil Operator | Jun 2019 |
| 2556 | Kinetica Partners, LLC | | Oil Operator | Dec 2024 |
| 2557 | King Drilling Co | Seville, OH 44273 | Oil & Gas Operator | Jan 2025 |
| 2558 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 2559 | King Resources Co. | | Oil & Gas Operator | Dec 1977 |
| 2560 | Kings Oil Company, Inc. | | Oil Operator | Jun 1989 |
| 2561 | Kingwood Exploration LLC | Shreveport, LA 71105 | Oil & Gas Operator | Feb 2026 |
| 2562 | Kinlaw Oil Corporation | Dallas, TX 75380 | Oil & Gas Operator | Feb 2026 |
| 2563 | Kinsey Interests | | Oil & Gas Operator | May 1991 |
| 2564 | Kinsey Interests And Marlin | | Oil Operator | Mar 1983 |
| 2565 | Kinsey Interests Et Al | | Oil Operator | Apr 1988 |
| 2566 | Kiowa-T.N.T., Inc. | | Oil Operator | Sep 1981 |
| 2567 | Kirby Exploration Co Of Texas | | Oil & Gas Operator | Nov 1993 |
| 2568 | Kirby Exploration Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2014 |
| 2569 | Kirby Oil Company | | Oil Operator | Dec 2024 |
| 2570 | Kirkwood Engineering, LTD | | Oil Operator | Dec 1991 |
| 2571 | Kisatchie Resources, LTD. | | Gas Operator | Jul 1991 |
| 2572 | Kiss Productions | | Oil & Gas Operator | Oct 2002 |
| 2573 | KJ Energy, LLC Of Delaware | | Oil & Gas Operator | Nov 2016 |
| 2574 | Kmi Continental Off. Prod. Co. | | Oil & Gas Operator | Jan 1988 |
| 2575 | Knight Casing Pulling Company | | Oil Operator | Jun 1989 |
| 2576 | Knight Exploration, Inc. | | Oil & Gas Operator | Sep 1989 |
| 2577 | Knight Resources LLC | | Oil & Gas Operator | Dec 2013 |
| 2578 | Knight Resources, Inc. | | Oil & Gas Operator | Dec 2011 |
| 2579 | Knightsbridge Petroleum Corp. | | Oil Operator | Jul 1991 |
| 2580 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 2581 | Koch Exploration Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 2582 | Koch Gateway Pipeline Company | | Oil & Gas Operator | Feb 2001 |
| 2583 | Konantz, Inc. | | Oil & Gas Operator | Jan 1995 |
| 2584 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 2585 | KPM Productions Inc. | | Oil & Gas Operator | Dec 1998 |
| 2586 | Kraker & Martin Energy, L.L.C. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2011 |
| 2587 | Kraker Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 1995 |
| 2588 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 2589 | Kriti Te Energy, Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 2017 |
| 2590 | KV Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2006 |
| 2591 | KWB Oil Property MGMT, Inc. | | Oil & Gas Operator | Mar 1983 |
| 2592 | Kykon Oil & Gas, Inc. | Billings, MT 59103 | Oil & Gas Operator | Jun 2007 |
| 2593 | Kyl-Kat Petroleum | | Oil & Gas Operator | Oct 1996 |
| 2594 | L & J Oil Co. | Borger, TX 79007 | Oil & Gas Operator | Apr 1999 |
| 2595 | L & K Oil | | Oil Operator | Oct 1997 |
| 2596 | L & L Supply | | Oil Operator | Dec 1994 |
| 2597 | L & N Co. | | Oil Operator | Jul 1991 |
| 2598 | L & R Petroleum | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 2599 | L & S Service Corp. | | Oil Operator | Jul 1989 |
| 2600 | L & T Exploration | | Oil & Gas Operator | Dec 1987 |