| 2401 | Jones Operating Company | Levelland, TX 79336 | Oil & Gas Operator | Oct 2000 |
| 2402 | Jones-O'Brien, Inc. | | Oil & Gas Operator | Feb 1982 |
| 2403 | Jordan Oil & Gas Company | Healdsburg, CA 95448-1919 | Oil & Gas Operator | Mar 1995 |
| 2404 | Jordan Oil Company, Inc. | Lake Charles, LA 70602 | Oil & Gas Operator | Dec 2019 |
| 2405 | Joseph C. Leckelt | | Oil Operator | Aug 1995 |
| 2406 | Joseph F. Fritz Operating Co. | | Oil & Gas Operator | Mar 1983 |
| 2407 | Josey Exploration, Inc. | | Oil & Gas Operator | Dec 1988 |
| 2408 | JPM Petroleum, Inc. | | Oil Operator | May 1986 |
| 2409 | JSB, LLC | | Oil & Gas Operator | Dec 2024 |
| 2410 | Julil Energy, LLC | Richmond, TX 77406 | Oil & Gas Operator | Dec 2024 |
| 2411 | June Energy Inc. | | Oil & Gas Operator | May 2000 |
| 2412 | Jurassic Exploration Co Inc. | | Oil & Gas Operator | Nov 1994 |
| 2413 | Justiss Oil Co Inc-Munoco Co | | Oil & Gas Operator | Dec 2008 |
| 2414 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Aug 2025 |
| 2415 | Justiss-Mears Oil Co. | | Oil & Gas Operator | Feb 1981 |
| 2416 | Justiss-Mears Oil Co., Et Al | | Oil & Gas Operator | Feb 1981 |
| 2417 | Justiss-Mears-D. Latimer | | Oil Operator | Mar 1979 |
| 2418 | Jva Operating Company | Midland, TX 79710 | Oil & Gas Operator | Oct 2021 |
| 2419 | JWR Exploration Inc. | | Oil & Gas Operator | Jul 1989 |
| 2420 | JWR Oil And Gas | | Oil Operator | Nov 2024 |
| 2421 | JZJ Corporation | | Oil Operator | May 2010 |
| 2422 | K & G Production | | Oil Operator | Jan 2025 |
| 2423 | K & S Rentals | | Oil & Gas Operator | May 2013 |
| 2424 | K & W Oil Company | MT Carmel, IL 62830 | Oil & Gas Operator | May 2013 |
| 2425 | K R S Expl., Inc. | | Oil Operator | Oct 2020 |
| 2426 | K Wilson Enterprises Inc. | | Oil Operator | Jan 2025 |
| 2427 | K-B Exploration Co. | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 2428 | K. D. Lankford, Jr & L&N DRLG Co | | Gas Operator | Dec 2010 |
| 2429 | K. D. Lankford, Jr., Et Al | | Gas Operator | Dec 2010 |
| 2430 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 2431 | Kabco Oil & Gas Company | Longview, TX 75604 | Oil & Gas Operator | Jun 2018 |
| 2432 | Kabco Production | | Oil & Gas Operator | Sep 1999 |
| 2433 | Kabco-Pennington | | Oil & Gas Operator | Oct 1996 |
| 2434 | Kadane Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 1998 |
| 2435 | Kaiser Aluminum Exploration Co | | Oil & Gas Operator | Dec 1986 |
| 2436 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 2437 | Kaiser Oil (U.S.) LTD. | | Oil & Gas Operator | Apr 1983 |
| 2438 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 2439 | Kalda Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 1994 |
| 2440 | Kaler Energy Corp. | Boerne, TX 78006 | Oil & Gas Operator | Dec 2025 |
| 2441 | Kamlok, Inc. | | Oil Operator | Nov 1991 |
| 2442 | Kanan Oil & Gas, Inc. | | Oil & Gas Operator | Oct 1987 |
| 2443 | Kaneb Energy Company | | Oil & Gas Operator | Jan 1986 |
| 2444 | Kaneb Oil & Gas Company | | Oil & Gas Operator | Nov 1985 |
| 2445 | Kaneb Operg Co. LTD. PTN. | | Oil & Gas Operator | Aug 1988 |
| 2446 | Kanpetro, Inc. | | Oil Operator | May 1991 |
| 2447 | Kansas Oil & Gas Corporation | Woodland HLS, CA 91367 | Oil & Gas Operator | Feb 2001 |
| 2448 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Dec 2025 |
| 2449 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |
| 2450 | Kauthar Energy Co., Inc. | | Oil & Gas Operator | Dec 2002 |
| 2451 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 2452 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 2453 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 2454 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 2455 | Keba Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2015 |
| 2456 | Kecco, Inc. | | Oil Operator | May 2002 |
| 2457 | Keck Partners | | Oil & Gas Operator | Apr 1989 |
| 2458 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 2459 | Keith W. Burton | | Oil & Gas Operator | Jan 2025 |
| 2460 | Kele Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 2461 | Kelley Oil & Sugar Creek Prod. | | Oil & Gas Operator | Oct 1992 |
| 2462 | Kelley Oil Corp/Yuma Petroleum | | Gas Operator | Jun 1994 |
| 2463 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 2464 | Kelley Operating Company, LTD. | | Oil & Gas Operator | Aug 2003 |
| 2465 | Kelly Bayou Production | | Oil & Gas Operator | Jan 2025 |
| 2466 | Kelly H Baxter | Austin, TX 78767 | Oil & Gas Operator | Nov 2006 |
| 2467 | Kelly Oil Co Inc | | Oil & Gas Operator | Sep 2013 |
| 2468 | Kem Ventures, LP | Katy, TX 77450 | Oil & Gas Operator | Sep 2025 |
| 2469 | Kenergy Petroleum Corp | | Oil & Gas Operator | Dec 1982 |
| 2470 | Kenergy-Wainoco | | Oil & Gas Operator | Mar 1981 |
| 2471 | Kennedy And Bacheller | | Oil & Gas Operator | Apr 1989 |
| 2472 | Kenneth Darnell | | Oil Operator | Jan 2025 |
| 2473 | Kepco Operating, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 2474 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Aug 2025 |
| 2475 | Kerr-McGee Oil & Gas Corp. | Houston, TX 77251 | Oil & Gas Operator | Sep 2006 |
| 2476 | Kerr-McGee Oil & Gas Onshore LP | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 2477 | Kerr-McGee Oil & Gas Onshr LLC | | Oil & Gas Operator | Dec 2005 |
| 2478 | Kerr-McGee Rocky Mountain Corp | Denver, CO 80202 | Oil & Gas Operator | Jan 2007 |
| 2479 | Kestrel Resources, Inc. | Dallas, TX 75204 | Oil & Gas Operator | Sep 2015 |
| 2480 | Kewanee Oil Company | Houston, TX 77001 | Oil & Gas Operator | Aug 1978 |
| 2481 | Key Energy Of Colorado, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2016 |
| 2482 | Key Energy Services, Inc.Altd | | Oil Operator | Dec 2006 |
| 2483 | Key Energy Services, LLC | Houston, TX 77042 | Oil Operator | Jan 2025 |
| 2484 | Key Operating Company Inc | Duncan, OK 73534-1284 | Oil & Gas Operator | Jan 2025 |
| 2485 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2025 |
| 2486 | Keystone Exploration, Inc | College Sta, TX 77845 | Oil & Gas Operator | Dec 2025 |
| 2487 | Keystone Fuel Oil Co | | Gas Operator | Nov 1997 |
| 2488 | Keystone Operating Co. | Round Rock, TX 78681 | Oil & Gas Operator | Dec 2025 |
| 2489 | Keystone Productions, LLC | | Gas Operator | Dec 2024 |
| 2490 | KFG Petroleum Corporation | | Oil & Gas Operator | Oct 2025 |
| 2491 | KFS Investments, L.L.C. | | Oil & Gas Operator | Jul 2009 |
| 2492 | Kilco, Inc. | | Gas Operator | Sep 1996 |
| 2493 | Killingsworth Oil Co. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 2494 | Kilmarnock Oil Company, Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Dec 2025 |
| 2495 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 2496 | Kilroy Co.- E.L. Cox | | Oil & Gas Operator | Aug 1990 |
| 2497 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 2498 | Kimbark Oil & Gas Company | Denver, CO 80203 | Oil & Gas Operator | May 2007 |
| 2499 | Kimco Energy Corporation | | Oil & Gas Operator | Apr 1989 |
| 2500 | Kindee Oil & Gas Louisiana, LLC | | Oil & Gas Operator | Aug 2012 |