| 16501 | Lamson Petroleum Corporation | | Oil & Gas Operator | Mar 1993 |
| 16502 | Lamson/Crocker Petroleum Corp. | | Oil & Gas Operator | May 1988 |
| 16503 | Lamson/Onshore Petroleum Corp. | | Oil & Gas Operator | Sep 1985 |
| 16504 | Lan Ma'S Oil And Gas LLC | Sugar Land, TX 77479 | Oil Operator | Jul 2025 |
| 16505 | Lancaster, Randy L. Dba Heritage Oil & Gas | Middlebourne, WV 26149 | Oil & Gas Operator | Dec 2021 |
| 16506 | Lance Exploration Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 1994 |
| 16507 | Lance Gas & Oil Productions | | Oil & Gas Operator | Jan 2025 |
| 16508 | Lance Leasing | Odessa, TX 79765 | Oil Operator | Sep 2025 |
| 16509 | Lance Oil & Gas Company Inc | Kirtland, NM 87417 | Oil & Gas Operator | Mar 2013 |
| 16510 | Lance Oil & Gas Productions | Bloomburg, TX 75556 | Oil & Gas Operator | Sep 2025 |
| 16511 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Jun 2025 |
| 16512 | Lancer Energy Corporation | Oklahoma City, OK 73132-5903 | Oil & Gas Operator | May 2015 |
| 16513 | Lancer Oil, Inc. | Piqua, KS 66761 | Oil Operator | May 2005 |
| 16514 | Lancer Petroleum Corporation | Irving, TX 75014 | Oil & Gas Operator | Feb 2014 |
| 16515 | Lancer Resources Company | | Oil & Gas Operator | Jan 1998 |
| 16516 | Lanco Oil & Gas, Inc. | Richland, TX 76681 | Oil & Gas Operator | Jan 1998 |
| 16517 | Land & Natural Res. Dev., Inc. | | Oil & Gas Operator | Apr 2007 |
| 16518 | Land And Natural Resource Development, Inc. | Northport, AL 35473 | Oil & Gas Operator | Apr 2025 |
| 16519 | Land, Cleatus H. Estate | Seguin, TX 78155 | Oil & Gas Operator | Mar 2001 |
| 16520 | Landaplenty, LLC | Glenville, WV 26351 | Oil & Gas Operator | Dec 2021 |
| 16521 | Landers & Musgrove | Okemah, OK 74859 | Oil & Gas Operator | Mar 2015 |
| 16522 | Landers & Musgrove Oil Co. Inc | Okemah, OK 74859-0266 | Oil & Gas Operator | Jan 2018 |
| 16523 | Landers & Waldman Inc | Okemah, OK 74859-0660 | Oil & Gas Operator | May 2013 |
| 16524 | Landers Oil & Gas Inc | Tulsa, OK 74132-2171 | Oil & Gas Operator | May 2025 |
| 16525 | Landers Production Company | Granite, OK 73547-0093 | Oil Operator | Apr 2014 |
| 16526 | Landes Explorati | | Oil Operator | Apr 1995 |
| 16527 | Landes, P. Todd, Jr. | Magnolia, AR 71753 | Oil Operator | Apr 1988 |
| 16528 | Landis, Andrew J. And Athanasia | Fredonia, NY 14063 | Gas Operator | Dec 2024 |
| 16529 | Landmark 4 LLC | Dalton, OH 44618-1111 | Oil & Gas Operator | Dec 2024 |
| 16530 | Landmark Drilling, L.L.C. | Waskom, TX 75692 | Oil Operator | Sep 2025 |
| 16531 | Landmark Energy LLC | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 16532 | Landmark Energy Partners, LLC | Edmond, OK 73013 | Oil Operator | Jul 2025 |
| 16533 | Landmark Exploration Co | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2013 |
| 16534 | Landmark Exploration Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Sep 2025 |
| 16535 | Landmark Ip, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 16536 | Landmark Oil & G | | Oil Operator | Nov 1987 |
| 16537 | Landmark Oil Exp | | Oil Operator | Sep 1994 |
| 16538 | Landmark Operating Company | Welty, OK 74833-3923 | Oil Operator | Aug 2015 |
| 16539 | Landmark Production Company | MC Gregor, TX 76657 | Oil & Gas Operator | Oct 2010 |
| 16540 | Landmark Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 16541 | Landmark Venture Group No. 1, Inc. | | Oil & Gas Operator | Jan 2025 |
| 16542 | Landmark Venture Group, Inc. | | Oil Operator | Dec 2008 |
| 16543 | Landmaster Partners, Inc. | Abilene, TX 79601 | Oil & Gas Operator | Sep 2025 |
| 16544 | Landmen Of Texas | Hondo, TX 78861 | Oil Operator | Feb 2007 |
| 16545 | Landmen Of Texas, Inc. | Hondo, TX 78861 | Oil Operator | Dec 2016 |
| 16546 | Landor Oil Co. | San Marcos, TX 78666 | Oil Operator | Sep 2025 |
| 16547 | Landowner | Honolulu, HI | Oil & Gas Operator | Dec 2008 |
| 16548 | Landprovest Inc | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1993 |
| 16549 | Landreth, Robert E. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 16550 | Landrick O & G Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Sep 2025 |
| 16551 | Landrum Petroleum Co., Inc. | Burkburnett, TX 76354 | Oil Operator | Mar 2008 |
| 16552 | Landrum West, Inc. | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 1997 |
| 16553 | Landrum, W. A. | Byers, TX 76357 | Oil & Gas Operator | Apr 2002 |
| 16554 | Lane Oil Company, LLC | Northern Cambria, PA 15714 | Oil Operator | Dec 2024 |
| 16555 | Lane Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2025 |
| 16556 | Lane, Lloyd L. | Buffalo, TX 75831 | Oil Operator | Sep 2025 |
| 16557 | Laneer Resources Company | Abilene, TX 79608 | Oil & Gas Operator | Sep 2025 |
| 16558 | Lanexco, Inc. | Sealy, TX 77474 | Oil & Gas Operator | Sep 2025 |
| 16559 | Lanford Drilling Co., Inc. | | Oil Operator | Jun 1996 |
| 16560 | Lang Herman Oil | | Oil & Gas Operator | Dec 1996 |
| 16561 | Lang Larry D | Beverly, OH 45715 | Oil & Gas Operator | Dec 2024 |
| 16562 | Lang, Herman - Marital Trust | Garden City, KS 67846 | Oil & Gas Operator | Apr 2025 |
| 16563 | Lang, Kenneth R. | Garden City, KS 67846 | Oil & Gas Operator | Apr 2025 |
| 16564 | Langasco Energy Corp | Alliance, OH 44601 | Oil & Gas Operator | Dec 1987 |
| 16565 | Langford & Brigham Operating LLC | Austin, TX 78730 | Oil & Gas Operator | Sep 2025 |
| 16566 | Langford Production Company, LLC | Haskell, TX 79521 | Oil & Gas Operator | Sep 2025 |
| 16567 | Langford, G. E. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2002 |
| 16568 | Langford, R. C. Operating Co. | Rule, TX 79547 | Oil & Gas Operator | Mar 1994 |
| 16569 | Langham Petroleum Expl. Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 2009 |
| 16570 | Langley Energy | Euless, TX 76040 | Gas Operator | Jan 2016 |
| 16571 | Langley Harold | Graham, OK 73437 | Oil Operator | May 2025 |
| 16572 | Langley, James Operating Company, Inc | Smackover, AR 71762 | Oil & Gas Operator | Dec 2024 |
| 16573 | Langley, Jerry Oil Company LLC | Smackover, AR 71762 | Oil Operator | Jan 2025 |
| 16574 | Langston Oil & Gas LLC | Wichita, KS 67202 | Oil Operator | Feb 2025 |
| 16575 | Lankford & Nance | | Gas Operator | Dec 2010 |
| 16576 | Lankford Oil Co. | Weatherford, TX 76086 | Oil & Gas Operator | Jul 1999 |
| 16577 | Lankford, Dan L. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 16578 | Lanmarc Resources | | Oil Operator | Dec 2003 |
| 16579 | Lanoco, Inc. | | Oil & Gas Operator | Sep 2002 |
| 16580 | Lansden Operating Co LLC | Norman, OK 73070 | Oil & Gas Operator | Dec 1997 |
| 16581 | Lansing Energy C | | Oil Operator | Jun 2006 |
| 16582 | Lansing Energy Operations | Wichita, KS 67202 | Oil Operator | Apr 2010 |
| 16583 | Lapco Oil & Gas Company | Houston, TX 77069 | Oil & Gas Operator | Oct 2015 |
| 16584 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 16585 | Lapis Operating, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jul 2015 |
| 16586 | Lappin Oil LLC | Douglas, WY 82633 | Oil & Gas Operator | Aug 2025 |
| 16587 | Laquey, E. C. | Refugio, TX 78377 | Oil & Gas Operator | Aug 2003 |
| 16588 | Lar-Mie Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 1998 |
| 16589 | Larae Operations | Luling, TX 78648 | Oil Operator | Sep 2025 |
| 16590 | Laramie Energy II LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2015 |
| 16591 | Laramie Energy LLC | | Oil & Gas Operator | Aug 2013 |
| 16592 | Laran Operating LLC | Dover, OK 73734-0057 | Oil & Gas Operator | Mar 2015 |
| 16593 | Larance Engineering Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Jan 1996 |
| 16594 | Larch Oil & Gas Corporation | Cross Lanes, WV 25313 | Oil & Gas Operator | Dec 2021 |
| 16595 | Larco Drilling & Exploration Corp. | | Oil & Gas Operator | Dec 1999 |
| 16596 | Larcom Mike | | Oil Operator | Feb 1987 |
| 16597 | Lardo, Anthony P. Jr. | Lakeview, NY 14085 | Gas Operator | Dec 2024 |
| 16598 | Laredo Energy | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 16599 | Laredo Energy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2022 |
| 16600 | Laredo Energy, LP | Houston, TX 77040 | Oil & Gas Operator | Oct 2003 |