| 2501 | Landmark Oil & G | | Oil Operator | Nov 1987 |
| 2502 | Landmark Oil Exp | | Oil Operator | Sep 1994 |
| 2503 | Landmark Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 2504 | Landowner | Honolulu, HI | Oil & Gas Operator | Dec 2008 |
| 2505 | Lang Herman Oil | | Oil & Gas Operator | Dec 1996 |
| 2506 | Lang, Herman - Marital Trust | Garden City, KS 67846 | Oil & Gas Operator | Mar 2025 |
| 2507 | Lang, Kenneth R. | Garden City, KS 67846 | Oil & Gas Operator | Mar 2025 |
| 2508 | Langston Oil & Gas LLC | Wichita, KS 67202 | Oil Operator | Feb 2025 |
| 2509 | Lansing Energy C | | Oil Operator | Jun 2006 |
| 2510 | Lansing Energy Operations | Wichita, KS 67202 | Oil Operator | Apr 2010 |
| 2511 | Larcom Mike | | Oil Operator | Feb 1987 |
| 2512 | Lario Oil & Gas | | Oil & Gas Operator | Nov 1995 |
| 2513 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Jul 2025 |
| 2514 | Larrette Resources | | Oil Operator | Nov 1999 |
| 2515 | Larson Buford | | Oil Operator | May 2006 |
| 2516 | Larson Operating | | Oil & Gas Operator | Mar 2001 |
| 2517 | Larson Operating Company | Olmitz, KS 67564-8561 | Oil & Gas Operator | Dec 2019 |
| 2518 | Lasmo Energy Cor | | Oil Operator | Feb 1990 |
| 2519 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 2520 | Lassetter Petrol | | Oil Operator | Oct 1986 |
| 2521 | Lasso Energy LLC | Chase, KS 67524 | Oil & Gas Operator | Mar 2025 |
| 2522 | Latex Petroleum Corp. | Houston, TX 77090 | Oil & Gas Operator | Aug 2012 |
| 2523 | Lauck D R Oil Co | | Oil & Gas Operator | Oct 1995 |
| 2524 | Law Production, Inc. | McPherson, KS 67460 | Oil Operator | Nov 2007 |
| 2525 | Lawbanco Drillin | | Oil Operator | Feb 1995 |
| 2526 | Lawbanco Drilling, Inc. | Natoma, KS 67651 | Oil Operator | May 1998 |
| 2527 | Lawco Holdings LLC | Bentonville, AR 72712 | Oil Operator | Apr 2025 |
| 2528 | Lawrence & Bush | Lawton, OK 73507 | Oil Operator | Dec 1995 |
| 2529 | Lawrence & Bush, Inc. | Pampa, TX 79065 | Oil Operator | Oct 1998 |
| 2530 | Lawrence Larry O | | Gas Operator | Sep 1993 |
| 2531 | Lawrence, Max | Cambridge, KS 67023 | Oil Operator | Dec 2024 |
| 2532 | Lawson Arthur C | | Oil Operator | Aug 1994 |
| 2533 | Lawson Petroleum Co. | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2009 |
| 2534 | Lawson, A.C., Inc. | Derby, KS 67037 | Oil Operator | Mar 2025 |
| 2535 | Lawson, Thelma | Geuda Springs, KS 67051 | Oil Operator | Dec 2009 |
| 2536 | Laymon Oil Compa | | Oil & Gas Operator | Dec 1996 |
| 2537 | Laymon Oil Company | | Oil Operator | Feb 2001 |
| 2538 | Laymon Oil II, LLC | Neosho Falls, KS 66758 | Oil Operator | Mar 2025 |
| 2539 | Laymon, Michael | Yates Center, KS 66783 | Oil Operator | Oct 2024 |
| 2540 | Layne Energy Operating, LLC | Kansas City, KS 66106 | Oil & Gas Operator | Feb 2025 |
| 2541 | Layton Glenn F J | | Oil Operator | Mar 1986 |
| 2542 | Layton Oil Compa | | Oil & Gas Operator | Jul 1985 |
| 2543 | Lazer Petroleum | | Oil Operator | Jan 1993 |
| 2544 | LDH Operating LLC | Wichita, KS 67278 | Oil Operator | Mar 2025 |
| 2545 | Le Norman Energy Corporation | Duncan, OK 73534 | Oil & Gas Operator | Nov 2014 |
| 2546 | Leach, Elwood | Osawatomie, KS 66064 | Oil Operator | Dec 2009 |
| 2547 | Leake Keith D | Winfield, KS 67156-8871 | Oil Operator | Apr 2004 |
| 2548 | Leake, Keith D.(Deceased) Estate | Derby, KS 67037 | Oil Operator | Mar 2003 |
| 2549 | Lear Petroleum E | | Oil & Gas Operator | Jan 1986 |
| 2550 | Leasing & Develo | | Oil & Gas Operator | Feb 1993 |
| 2551 | Leasing & Development, Inc. | Wichita, KS 67202 | Oil Operator | Jun 2022 |
| 2552 | Leavell Resource | | Oil Operator | Dec 1993 |
| 2553 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 2554 | Leben Corp. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2011 |
| 2555 | Leben Drilling I | | Oil & Gas Operator | Dec 1988 |
| 2556 | Leben Oil Corpor | | Oil & Gas Operator | Apr 1991 |
| 2557 | Leben Theodore I | | Oil & Gas Operator | Dec 1995 |
| 2558 | Lebosquet Gas Operations, LLC | Wichita, KS 67202 | Gas Operator | Mar 2025 |
| 2559 | Lebosquet John R | | Gas Operator | Dec 1994 |
| 2560 | Lebosquet, John W. | Wichita, KS 67202 | Gas Operator | Mar 2025 |
| 2561 | Lebow, Marvin E. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1997 |
| 2562 | Lebsack Oil Prod | | Oil & Gas Operator | Nov 1995 |
| 2563 | Lebsack Oil Production Inc. | Stafford, KS 67578 | Oil & Gas Operator | Mar 2025 |
| 2564 | Lebsack, James S. | Denver, CO 80222 | Oil Operator | Sep 1998 |
| 2565 | Led Enterprises | El Dorado, KS 67042 | Oil Operator | Sep 1999 |
| 2566 | Led Enterprises LLC | El Dorado, KS 67042 | Oil Operator | Dec 2009 |
| 2567 | Lee Donna Oil Co | | Oil & Gas Operator | Dec 1996 |
| 2568 | Lee Phillips Oil Company | | Oil Operator | Mar 2025 |
| 2569 | Leedy Oil Produc | | Oil & Gas Operator | Dec 1995 |
| 2570 | Leedy Oil Producers | | Oil Operator | Nov 2009 |
| 2571 | Legacy Energy LLC | Russell, KS 67665 | Oil Operator | Feb 2025 |
| 2572 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 2573 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Jul 2025 |
| 2574 | Legend Energy LLC | Cherryvale, KS 67335 | Oil Operator | Dec 2024 |
| 2575 | Legend Oil & Gas LTD. | Alpharetta, GA 30022 | Oil Operator | Mar 2015 |
| 2576 | Legleiter, Julius A. | Hays, KS 67601 | Oil Operator | Apr 1996 |
| 2577 | Legrand, Buck | Sedan, KS 67361 | Oil Operator | Jun 1994 |
| 2578 | Leiker, Edward P. | Hays, KS 67601 | Oil Operator | Apr 1992 |
| 2579 | Leis Oil Services, LLC | Yates Center, KS 66783 | Oil Operator | Jul 2023 |
| 2580 | Leis, John E. | Yates Center, KS 66783 | Oil Operator | Mar 2025 |
| 2581 | Leis, Ryan M. | Scottsdale, AZ 85258 | Oil & Gas Operator | Dec 2009 |
| 2582 | Leis, Steven A. | Yates Center, KS 66783 | Oil Operator | Mar 2025 |
| 2583 | Leis, VIctor J. | Paola, KS 66071 | Oil & Gas Operator | Dec 2024 |
| 2584 | Leith Operations | | Oil Operator | Jul 1989 |
| 2585 | Leo Michaelis Oil Operator | | Oil Operator | Oct 2002 |
| 2586 | Leonard, Daniel M. | Fort Worth, TX 76101 | Oil & Gas Operator | Nov 2001 |
| 2587 | Leroy Holt Oil Operations | | Oil Operator | Mar 2010 |
| 2588 | Levi Oil Company | Wichita, KS 67218 | Oil & Gas Operator | Nov 1993 |
| 2589 | Lewis Energy LLC | Tulsa, OK 74159 | Oil Operator | Apr 2025 |
| 2590 | Lewis Oil & Gas Of Galva, Inc. | Galva, KS 67443 | Oil Operator | Mar 2025 |
| 2591 | Lewis, Beverly J | | Oil Operator | Feb 2025 |
| 2592 | LH Oil, LLC | Ottawa, KS 66067 | Oil Operator | Feb 2025 |
| 2593 | Liberty Enterpri | | Oil Operator | Jan 1987 |
| 2594 | Liberty Oper & Compl, Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2022 |
| 2595 | Liberty Operations & Completion, Inc | Plainville, KS 67663 | Oil Operator | Mar 2025 |
| 2596 | Liboc, Inc. | New York, NY 10110 | Oil & Gas Operator | Dec 2009 |
| 2597 | Liedtke Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2022 |
| 2598 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 2599 | Lincoln 77, Inc. | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 2600 | Lind Oil & Gas | Tulsa, OK 74136 | Gas Operator | Nov 2000 |