| 3401 | Lefco Resources LLC | Henryetta, OK 74437 | Gas Operator | Jun 2025 |
| 3402 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | Jul 2025 |
| 3403 | Legacy - M & K Corporation | Dallas, TX 75231-0969 | Oil & Gas Operator | Jan 2025 |
| 3404 | Legacy Energy Services LLC | Stillwater, OK 74074 | Oil & Gas Operator | Jul 2025 |
| 3405 | Legacy Oklahoma Operators LLC | Shawnee, OK 74804-1447 | Oil & Gas Operator | Jun 2025 |
| 3406 | Legacy Petroleum LLC | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 3407 | Legacy Reserves Operating LP | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 3408 | Legado Midcon, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2010 |
| 3409 | Legend Energy Corporation | Stillwater, OK 74074-1721 | Oil & Gas Operator | Aug 2022 |
| 3410 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 3411 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 3412 | Lemley Oil Corporation | Sulphur, OK 73086-9316 | Oil & Gas Operator | Jan 2025 |
| 3413 | Lenhart Oil Company | Cashion, OK 73016-0188 | Oil & Gas Operator | Jul 2016 |
| 3414 | Leonard Brothers Operating Co. | Fort Worth, TX 76101 | Oil & Gas Operator | Oct 2025 |
| 3415 | Leonard Vann | | Oil Operator | Feb 2025 |
| 3416 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 3417 | Lester Joan | Sand Springs, OK 74063 | Oil & Gas Operator | Jun 2025 |
| 3418 | Levinson Partners Corporation | Denver, CO 80202 | Oil & Gas Operator | Jul 1995 |
| 3419 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 3420 | Lewbet Inc | Perry, OK 73077 | Oil & Gas Operator | Aug 2024 |
| 3421 | Lewis A Hembree Production Co | Shawnee, OK 74801 | Oil & Gas Operator | Jun 2025 |
| 3422 | Lewis Energy LLC | Tulsa, OK 74159 | Oil Operator | Jun 2025 |
| 3423 | Lewis J K | Duncan, OK 73534-1742 | Oil & Gas Operator | Apr 2015 |
| 3424 | Lewis James D Oil Company | Healdton, OK 73438 | Oil Operator | Jun 2025 |
| 3425 | Lewis John L Well Service | Sasakwa, OK 74867 | Oil Operator | May 2013 |
| 3426 | Lewis Oil And Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 3427 | Lewis Oil Corp. | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2025 |
| 3428 | Lewis Oil Operations LLC | Ratliff City, OK 73481 | Oil & Gas Operator | Jun 2025 |
| 3429 | Lewis Operating Company | Holliday, TX 76366 | Oil & Gas Operator | Oct 2025 |
| 3430 | Lewis Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 1995 |
| 3431 | Lewis, R. J. Oil Company | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 3432 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 3433 | Lightner Harry A | | Oil & Gas Operator | May 2013 |
| 3434 | Likins-Foster Honolulu Corp | Foster City, CA 94404 | Oil & Gas Operator | Feb 2015 |
| 3435 | Lil Dab Petroleum Inc | Ringling, OK 73456 | Oil Operator | Jun 2025 |
| 3436 | Lil-Mor Oil Company | Tulsa, OK 74105 | Oil Operator | Dec 2000 |
| 3437 | Lillard Pipe & Supply Inc | Shawnee, OK 74802-0847 | Oil & Gas Operator | Nov 2014 |
| 3438 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 3439 | Lime Rock Resources II-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 3440 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Aug 2025 |
| 3441 | Lime Rock Resources IV-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 3442 | Limestone Exploration II, LLC | Midland, TX 79704 | Oil & Gas Operator | Jun 2019 |
| 3443 | Limestone Productions | Bartlesville, OK 74006-8229 | Oil & Gas Operator | Sep 2013 |
| 3444 | Linam Harry Dba Sooner State Production | Marlow, OK 73055-0583 | Oil & Gas Operator | Apr 2015 |
| 3445 | Linam Richard Dwayne | Marlow, OK 73055-8658 | Oil Operator | Nov 2024 |
| 3446 | Lincoln 77, Inc. | Chanute, KS 66720 | Oil Operator | Dec 2001 |
| 3447 | Lincoln Rock Corporation | Northfield, IL 60093 | Oil & Gas Operator | Jul 2003 |
| 3448 | Lincoln Tank Truck Service Inc | Stroud, OK 74079-0662 | Oil & Gas Operator | May 2013 |
| 3449 | Lincoln Ventures LLC | Inola, OK 74036-5035 | Oil & Gas Operator | Jun 2025 |
| 3450 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 3451 | Link Oil Company (The) | Tulsa, OK 74103-4113 | Oil & Gas Operator | Jan 2014 |
| 3452 | Linn Mid-Continent Operating Inc | Houston, TX 77002-3018 | Oil & Gas Operator | Jun 2016 |
| 3453 | Lion Petroleum Company | Oklahoma City, OK 73120-4503 | Oil & Gas Operator | Aug 2015 |
| 3454 | Liston V Dean | Nowata, OK 74048-5200 | Oil & Gas Operator | Nov 2016 |
| 3455 | Litsey Exploration LLC | Okmulgee, OK 74447 | Oil & Gas Operator | Jun 2025 |
| 3456 | Little Bear Oil & Gas Co LTD | Boca Rotan, FL 33431 | Oil & Gas Operator | Jan 1997 |
| 3457 | Little Bear Resources LLC | Stillwater, OK 74074-1388 | Oil & Gas Operator | Feb 2013 |
| 3458 | Little Chicago Oil & Gas Inc | Edmond, OK 73034-0809 | Oil & Gas Operator | Dec 2017 |
| 3459 | Little Chief Energy Corporation | Independence, KS 67301 | Oil Operator | Jun 2025 |
| 3460 | Little O Oil Company | Velma, OK 73091-0425 | Oil & Gas Operator | Apr 2015 |
| 3461 | Little Oil Company LLC | Cushing, OK 74023 | Oil Operator | Jun 2025 |
| 3462 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Jun 2025 |
| 3463 | Little Thunder, LLC | Bartlesville, OK 74003 | Oil Operator | Jun 2025 |
| 3464 | Littrell Chemical Inc | Cleo Springs, OK 73729 | Oil & Gas Operator | Jan 2005 |
| 3465 | Litzenberger Exploration | Waynoka, OK 73860 | Oil & Gas Operator | Jul 1996 |
| 3466 | Litzenberger Exploration Inc | Waynoka, OK 73860 | Oil & Gas Operator | Jul 2025 |
| 3467 | Lo-Jel Energy LLC | Oklahoma City, OK 73162-7418 | Oil & Gas Operator | Nov 2019 |
| 3468 | Lobar Oil Co LLC | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 3469 | Lobo Energy, Inc. | Laredo, TX 78044 | Oil & Gas Operator | Nov 1996 |
| 3470 | Lobo Exploration Company | Yukon, OK 73099 | Oil & Gas Operator | Jun 2025 |
| 3471 | Lobo Petroleum Inc | Guymon, OK 73942-0714 | Oil Operator | Jul 2016 |
| 3472 | Locators Oil And Gas Inc | Guthrie, OK 73044 | Oil & Gas Operator | Oct 2022 |
| 3473 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | Oct 2025 |
| 3474 | Locke Stock & Barrel Res Inc | Calgary, AB T2P3G | Oil Operator | Nov 1998 |
| 3475 | Loco Oil Company | Loco, OK 73442 | Oil Operator | Feb 1993 |
| 3476 | Lodestone Operating, Inc. | Portland, TX 78374 | Oil & Gas Operator | Oct 2025 |
| 3477 | Logan Productions LLC | Wewoka, OK 74884 | Oil Operator | May 2025 |
| 3478 | Lojac Resources LLC | Yukon, OK 73099-7309 | Oil Operator | Jun 2025 |
| 3479 | Loki Oil LLC | Cushing, OK 74023 | Oil & Gas Operator | Nov 2024 |
| 3480 | Loman Linda Gann | Norman, OK 73069-6548 | Oil Operator | Apr 2011 |
| 3481 | London William W | Oklahoma City, OK 73116 | Oil & Gas Operator | Nov 2015 |
| 3482 | London William W Inc | Oklahoma City, OK 73116-5116 | Oil & Gas Operator | Apr 2016 |
| 3483 | Lone Star Resources Company | Keyes, OK 73947 | Oil & Gas Operator | Mar 2015 |
| 3484 | Lone Tree Oil & Gas LLC | Greenwood VLG, CO 80111 | Oil & Gas Operator | Oct 2025 |
| 3485 | Long Engineering Company Inc | Oklahoma City, OK 73112-7769 | Oil Operator | Jun 2008 |
| 3486 | Long George L | San Antonio, TX 78209 | Oil & Gas Operator | Feb 1996 |
| 3487 | Long Production LLC | Claremore, OK 74017-2808 | Oil & Gas Operator | Oct 2019 |
| 3488 | Long Resources Inc | Austin, TX 78730 | Oil & Gas Operator | Jul 2025 |
| 3489 | Long Royalty Company | Yukon, OK 73085 | Oil & Gas Operator | Jan 2004 |
| 3490 | Long, James A | | Oil Operator | Aug 2000 |
| 3491 | Long, John P | | Oil & Gas Operator | Jun 2025 |
| 3492 | Longacre Oil & Gas | Enid, OK 73702 | Oil & Gas Operator | Mar 2013 |
| 3493 | Longberry Energy Inc | Keota, OK 74941 | Gas Operator | Jun 2025 |
| 3494 | Longbranch Oil Company | Oklahoma City, OK 73154-0735 | Oil & Gas Operator | Mar 2018 |
| 3495 | Longfellow Energy, LP | Dallas, TX 75225 | Oil & Gas Operator | Oct 2025 |
| 3496 | Longhorn Estates & Cattle Co. LLC | Jennings, OK 74038 | Oil Operator | Jun 2025 |
| 3497 | Longhurst Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 3498 | Longview Production Company | Dallas, TX 75243-3795 | Oil & Gas Operator | May 2025 |
| 3499 | Lord Enterprises Inc | Oklahoma City, OK 73106-5050 | Oil & Gas Operator | Sep 2000 |
| 3500 | Lorentz Oil & Gas LLC | Edmond, OK 73034-7266 | Oil & Gas Operator | Jun 2025 |