| 2401 | K R S Expl., Inc. | | Oil Operator | Oct 2020 |
| 2402 | K W B Oil Property MGMT Inc | | Oil & Gas Operator | Jun 2000 |
| 2403 | K Wilson Enterprises Inc. | | Oil Operator | Jan 2025 |
| 2404 | K-B Exploration Co. | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 2405 | K. D. Lankford, Jr & L&N DRLG Co | | Gas Operator | Dec 2010 |
| 2406 | K. D. Lankford, Jr., Et Al | | Gas Operator | Dec 2010 |
| 2407 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 2408 | Kabco Oil & Gas Company | Longview, TX 75604 | Oil & Gas Operator | Jun 2018 |
| 2409 | Kabco Production | | Oil & Gas Operator | Sep 1999 |
| 2410 | Kabco-Pennington | | Oil & Gas Operator | Oct 1996 |
| 2411 | Kadane Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1998 |
| 2412 | Kaiser Aluminum Exploration Co | | Oil & Gas Operator | Dec 1986 |
| 2413 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 2414 | Kaiser Oil (U.S.) LTD. | | Oil & Gas Operator | Apr 1983 |
| 2415 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 2416 | Kalda Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1994 |
| 2417 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Jul 2025 |
| 2418 | Kamlok, Inc. | | Oil Operator | Nov 1991 |
| 2419 | Kanan Oil & Gas, Inc. | | Oil & Gas Operator | Oct 1987 |
| 2420 | Kaneb Energy Company | | Oil & Gas Operator | Jan 1986 |
| 2421 | Kaneb Oil & Gas Company | | Oil & Gas Operator | Nov 1985 |
| 2422 | Kaneb Operg Co. LTD. PTN. | | Oil & Gas Operator | Aug 1988 |
| 2423 | Kanpetro, Inc. | | Oil Operator | May 1991 |
| 2424 | Kansas Oil & Gas Corporation | Woodland HLS, CA 91367 | Oil & Gas Operator | Feb 2001 |
| 2425 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Jul 2025 |
| 2426 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |
| 2427 | Kauthar Energy Co., Inc. | | Oil & Gas Operator | Dec 2002 |
| 2428 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 2429 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 2430 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 2431 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 2432 | Keba Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2015 |
| 2433 | Kecco, Inc. | | Oil Operator | May 2002 |
| 2434 | Keck Partners | | Oil & Gas Operator | Apr 1989 |
| 2435 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 2436 | Keith W. Burton | | Oil & Gas Operator | Jan 2025 |
| 2437 | Kele Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 2438 | Kelley Oil & Sugar Creek Prod. | | Oil & Gas Operator | Oct 1992 |
| 2439 | Kelley Oil Corp/Yuma Petroleum | | Gas Operator | Jun 1994 |
| 2440 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 2441 | Kelley Operating Company, LTD. | | Oil & Gas Operator | Aug 2003 |
| 2442 | Kelly Bayou Production | | Oil & Gas Operator | Jan 2025 |
| 2443 | Kelly H. Baxter | Austin, TX 78767 | Oil & Gas Operator | Nov 2006 |
| 2444 | Kelly Oil Company | | Oil & Gas Operator | Sep 2013 |
| 2445 | Kem Ventures, LP | Katy, TX 77450 | Oil & Gas Operator | May 2025 |
| 2446 | Kendrick Enterprises, Inc. | Burleson, TX 76028 | Oil Operator | Jun 1985 |
| 2447 | Kenergy Petroleum Corp | | Oil & Gas Operator | Dec 1982 |
| 2448 | Kenergy-Wainoco | | Oil & Gas Operator | Mar 1981 |
| 2449 | Kennedy And Bacheller | | Oil & Gas Operator | Apr 1989 |
| 2450 | Kenneth Darnell | | Oil Operator | Jan 2025 |
| 2451 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 2452 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Apr 2025 |
| 2453 | Kerr-McGee Oil & Gas Corp. | Houston, TX 77251 | Oil & Gas Operator | Sep 2006 |
| 2454 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 2455 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 2456 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 2457 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Jan 2017 |
| 2458 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 2459 | Key Energy Of Colorado, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2016 |
| 2460 | Key Energy Services, Inc.Altd | | Oil Operator | Dec 2006 |
| 2461 | Key Energy Services, LLC | Houston, TX 77042 | Oil Operator | Jan 2025 |
| 2462 | Key Operating Co., Inc. | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 2463 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Apr 2025 |
| 2464 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Jul 2025 |
| 2465 | Keystone Fuel Oil Co | | Gas Operator | Nov 1997 |
| 2466 | Keystone Operating Co. | Round Rock, TX 78681 | Oil & Gas Operator | Jul 2025 |
| 2467 | Keystone Productions, LLC | | Gas Operator | Dec 2024 |
| 2468 | KFG Petroleum Corporation | | Oil & Gas Operator | May 2025 |
| 2469 | Kilco, Inc. | | Gas Operator | Sep 1996 |
| 2470 | Killingsworth Oil Co. | Longview, TX 75606 | Oil & Gas Operator | Jul 2025 |
| 2471 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Jul 2025 |
| 2472 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 2473 | Kilroy Co.- E.L. Cox | | Oil & Gas Operator | Aug 1990 |
| 2474 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 2475 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 2476 | Kimco Energy Corporation | | Oil & Gas Operator | Apr 1989 |
| 2477 | Kindee Oil & Gas Louisiana, LLC | | Oil & Gas Operator | Aug 2012 |
| 2478 | Kinder Gas Inc | | Oil Operator | Dec 2011 |
| 2479 | Kinder Morgan Treating LP | | Oil Operator | Jun 2019 |
| 2480 | Kinetica Partners, LLC | | Oil Operator | Dec 2024 |
| 2481 | King Drilling Co | Seville, OH 44273 | Oil & Gas Operator | Jan 2025 |
| 2482 | King Ranch Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 1997 |
| 2483 | King Resources Co. | | Oil & Gas Operator | Dec 1977 |
| 2484 | Kings Oil Company, Inc. | | Oil Operator | Jun 1989 |
| 2485 | Kingwood Exploration LLC | Shreveport, LA 71105 | Oil & Gas Operator | Jul 2025 |
| 2486 | Kinlaw Oil Corporation | Dallas, TX 75380 | Oil & Gas Operator | Jul 2025 |
| 2487 | Kinsey Interests | | Oil & Gas Operator | May 1991 |
| 2488 | Kinsey Interests And Marlin | | Oil Operator | Mar 1983 |
| 2489 | Kinsey Interests Et Al | | Oil Operator | Apr 1988 |
| 2490 | Kiowa-T.N.T., Inc. | | Oil Operator | Sep 1981 |
| 2491 | Kirby Exploration Co | Houston, TX 77251 | Oil & Gas Operator | Jan 2014 |
| 2492 | Kirby Exploration Co Of Texas | | Oil & Gas Operator | Nov 1993 |
| 2493 | Kirby Oil Company | | Oil Operator | Dec 2024 |
| 2494 | Kirkwood Engineering, LTD | | Oil Operator | Dec 1991 |
| 2495 | Kisatchie Resources, LTD. | | Gas Operator | Jul 1991 |
| 2496 | Kiss Productions | | Oil & Gas Operator | Oct 2002 |
| 2497 | KJ Energy, LLC Of Delaware | | Oil & Gas Operator | Nov 2016 |
| 2498 | Kmi Continental Off. Prod. Co. | | Oil & Gas Operator | Jan 1988 |
| 2499 | Knight Casing Pulling Company | | Oil Operator | Jun 1989 |
| 2500 | Knight Exploration, Inc. | | Oil & Gas Operator | Sep 1989 |