| 401 | Langasco Energy Corp | Alliance, OH 44601 | Oil & Gas Operator | Dec 1987 |
| 402 | Laurel Mountain Production | Pittsburgh, PA 15241-1633 | Oil & Gas Operator | Mar 2026 |
| 403 | Leali & Leali Oil Inc | Hermitage, PA 16148-9020 | Oil & Gas Operator | Dec 2016 |
| 404 | Leatherwood, LLC | Canonsburg, PA 15317-6506 | Oil & Gas Operator | Dec 2023 |
| 405 | Leboeuf MFG Inc | Waterford, PA 16441-0458 | Gas Operator | Dec 1990 |
| 406 | Lee E & M Lee Minter | New Kensington, PA 15068-1440 | Gas Operator | Dec 2003 |
| 407 | Lee Lynn MGMT Co | Indiana, PA 15701-3400 | Oil & Gas Operator | Dec 1991 |
| 408 | Legacy Ogc LLC | Erie, PA 16509 | Oil & Gas Operator | Dec 2025 |
| 409 | Lenape Resources Corp | | Oil & Gas Operator | Dec 2000 |
| 410 | Lendrum Energy LLC | Cranberry, PA 16319-4009 | Oil & Gas Operator | Dec 2025 |
| 411 | Lightning Oil Co LTD | Mentor, OH 44060-4963 | Gas Operator | Dec 1998 |
| 412 | Lincoln MGMT Co | Greensburg, PA 15601-5200 | Oil & Gas Operator | Dec 2017 |
| 413 | Lindell & Maney | Warren, PA 16365-3643 | Oil & Gas Operator | Dec 2008 |
| 414 | Lindell & Maney LLC | Warren, PA 16365-3670 | Oil & Gas Operator | Dec 2025 |
| 415 | Linn Opr Inc | Indiana, PA 15701-8914 | Oil & Gas Operator | Dec 2007 |
| 416 | Linn Opr LLC | Indiana, PA 15701-8914 | Gas Operator | Dec 2004 |
| 417 | Lion Energy Co LLC | Wexford, PA 15090-6315 | Oil & Gas Operator | Dec 2014 |
| 418 | Loan Asset Issuer LLC, Series 2021 NG-1 | New York, NY 10022 | Oil & Gas Operator | Mar 2026 |
| 419 | Locin Oil Corporation | Katy, TX 77494 | Oil & Gas Operator | Jun 2026 |
| 420 | Lola Energy Petroco LLC | Canonsburg, PA 15317 | Gas Operator | Mar 2026 |
| 421 | LPR Energy, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jun 2026 |
| 422 | LT Oil Co LLC | Pleasantville, PA 16341-0144 | Oil Operator | Dec 2025 |
| 423 | Lulu & Thomas Kavouras | Apollo, PA 15613-1108 | Oil & Gas Operator | Dec 2023 |
| 424 | M & M Royalty LTD | North Canton, OH 44720 | Oil & Gas Operator | Dec 2016 |
| 425 | M4 Energy, LLC | | Oil & Gas Operator | Dec 2025 |
| 426 | Madison Mark T | Marienville, PA 16239-6029 | Oil & Gas Operator | Dec 2012 |
| 427 | Madtick Dev Corp | Punxsutawney, PA 15767-0140 | Oil & Gas Operator | Dec 2024 |
| 428 | Maney McNeal Oil & Gas | | Oil & Gas Operator | Dec 1999 |
| 429 | Manx Inc | Pleasantville, PA 16341-1229 | Oil Operator | Dec 2020 |
| 430 | Maple Grove Enterprises Inc | Rimersburg, PA 16248-6415 | Oil & Gas Operator | Dec 2025 |
| 431 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Apr 2026 |
| 432 | Marco Drilling Inc | Monroeville, PA 15146-0278 | Oil & Gas Operator | Dec 2025 |
| 433 | Mark & Troy Johnson | Sugar Grove, PA 16350-5938 | Oil Operator | Dec 2025 |
| 434 | Mark A & Michael J Midlik | Warren, PA 16365-2029 | Oil & Gas Operator | Dec 2015 |
| 435 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 436 | Marvin Sanders Oil | Sugar Grove, PA 16350-5612 | Oil & Gas Operator | Dec 2016 |
| 437 | Mat Oil & Gas Exploration Inc | Indiana, PA 15701-8931 | Gas Operator | Dec 1993 |
| 438 | Maxson Gas Corp | Shinglehouse, PA 16748-0436 | Oil & Gas Operator | Dec 2024 |
| 439 | Maxson Lawrence C | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2016 |
| 440 | Maxwell Bros | Clarion, PA 16214-7446 | Oil & Gas Operator | Dec 2025 |
| 441 | Mays Gas & Coal Co | Clarion, PA 16214-0447 | Oil & Gas Operator | Dec 2025 |
| 442 | MBS Resources Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2025 |
| 443 | McCall Carl E | Fairmount City, PA 16224 | Oil & Gas Operator | Dec 2025 |
| 444 | McCluskey J Sterling | New York, NY 10128-1008 | Gas Operator | Dec 1989 |
| 445 | McComb Oil Inc | Stoneboro, PA 16153-3017 | Oil & Gas Operator | Dec 2025 |
| 446 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Mar 2026 |
| 447 | McKenna Oil Co | Kane, PA 16735-9711 | Oil & Gas Operator | Dec 2004 |
| 448 | MDS Energy Dev LLC | Kittanning, PA 16201-4403 | Oil & Gas Operator | Mar 2026 |
| 449 | MDS Energy LTD | Kittanning, PA 16201-4403 | Gas Operator | Feb 2015 |
| 450 | Mead Oil LLC | Sheffield, PA 16347-1022 | Oil & Gas Operator | Dec 2025 |
| 451 | Medina Res Dev Co LLC | Cambridge Springs, PA 16403-3447 | Oil & Gas Operator | Mar 2026 |
| 452 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 453 | Meridian Oil & Gas Enterprises Inc | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 454 | Mervin Troyer | Union City, PA 16438-8510 | Gas Operator | Dec 2008 |
| 455 | Mid Amer Natural Resources Inc | Erie, PA 16505-4760 | Gas Operator | Dec 1994 |
| 456 | Mid East Oil Co | Indiana, PA 15701-5378 | Gas Operator | Dec 2006 |
| 457 | Mieka LLC | Flower Mound, TX 75028-7446 | Oil & Gas Operator | Dec 2014 |
| 458 | Millennium Oil & Gas Inc | Dexter, KS 67038 | Oil & Gas Operator | Dec 2025 |
| 459 | Minard Run Oil Co | Bradford, PA 16701 | Oil & Gas Operator | Dec 2025 |
| 460 | Minteer & Baker Gas Enterprise | Kittanning, PA 16201-5022 | Gas Operator | Dec 2025 |
| 461 | Missing Moon Oil Inc | Knox, PA 16232-4507 | Oil & Gas Operator | Dec 2025 |
| 462 | Mitch Well Energy Inc | Waterford, PA 16441-8143 | Oil & Gas Operator | Dec 2012 |
| 463 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 464 | Mob Corp | Waynesburg, PA 15370-2036 | Gas Operator | Dec 2007 |
| 465 | Monona LLC | Ligonier, PA 15658-0612 | Gas Operator | Mar 2026 |
| 466 | Monroe Res LTD | Fairport, NY 14450-3218 | Gas Operator | Dec 2004 |
| 467 | Mount Chestnut Dev LLC | Butler, PA 16002-3940 | Gas Operator | Dec 2017 |
| 468 | MSL Oil & Gas Corp | Bradford, PA 16701-0151 | Oil & Gas Operator | Dec 2025 |
| 469 | MTN Energy | Aleppo, PA 15310 | Oil & Gas Operator | Mar 2026 |
| 470 | MTN V Oil & Gas Inc | | Oil & Gas Operator | Mar 2026 |
| 471 | Murphy Prod Inc | Vanderbilt, PA 15486-1001 | Oil & Gas Operator | Dec 2025 |
| 472 | Mutual Oil & Gas Co | Akron, OH 44311 | Oil & Gas Operator | Dec 2000 |
| 473 | Natl Fuel Gas Supply Corp | Williamsville, NY 14221-5887 | Oil & Gas Operator | Dec 2009 |
| 474 | Natural Energy Dev Corp | Pittsburgh, PA 15241-1548 | Oil & Gas Operator | Dec 2018 |
| 475 | Natural Oil & Gas Corp | Bradford, PA 16701 | Oil & Gas Operator | Dec 2023 |
| 476 | NCL Natural Resources LLC | Spring, TX 77381-5261 | Oil & Gas Operator | Dec 2017 |
| 477 | Nea Cross Inc | Erie, PA 16508-2769 | Gas Operator | Dec 1991 |
| 478 | New Century Energy Inc | MC Donald, PA 15057-2163 | Oil & Gas Operator | Dec 2021 |
| 479 | New York Natural Gas Corp | Pittsburgh, PA 15222-1402 | Gas Operator | Dec 1990 |
| 480 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Jun 2026 |
| 481 | Norbert J Baumgart | Warren, PA 16365-3403 | Oil & Gas Operator | Dec 2009 |
| 482 | Nornew Inc | Houston, TX 77063-2140 | Oil & Gas Operator | Dec 2008 |
| 483 | North Amer Oil & Gas Drilling Co Inc | Pleasantville, PA 16341-0197 | Oil Operator | Dec 1999 |
| 484 | North Cambria Fuel Co | Blairsville, PA 15717-7961 | Gas Operator | Dec 2008 |
| 485 | North East Gas & Oil Co | Scottsville, VA 24590-3962 | Oil & Gas Operator | Dec 2013 |
| 486 | North John M | Valatie, NY 12184-5005 | Gas Operator | Dec 2014 |
| 487 | North Penn Gas Co | Allentown, PA 18101-1139 | Gas Operator | Dec 2000 |
| 488 | North Star Energy Resources LLC | Waynesburg, PA 15370-3833 | Gas Operator | Dec 2025 |
| 489 | Northeast Natural Energy LLC | Charleston, WV 25301-2719 | Oil & Gas Operator | Mar 2026 |
| 490 | Northeastern Opr Co Inc | Shelocta, PA 15774-2346 | Gas Operator | Dec 2025 |
| 491 | Northwest Natural Gas Co | Albion, PA 16401-9998 | Oil & Gas Operator | Dec 1990 |
| 492 | Northwestern Inc | East Brady, PA 16028 | Gas Operator | Dec 2012 |
| 493 | Noumenon Corporation | Core, WV 26541-7072 | Oil & Gas Operator | Dec 2025 |
| 494 | NTS Energy LLC | Indiana, PA 15701-1801 | Oil & Gas Operator | Dec 2015 |
| 495 | Nucomer Energy LLC | Erie, PA 16510 | Oil & Gas Operator | Mar 2026 |
| 496 | Nytis Exploration Company LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2021 |
| 497 | Oakes Gas Co Inc | Kane, PA 16735-3905 | Gas Operator | Dec 2023 |
| 498 | Oakmont CC | Oakmont, PA 15139-1135 | Gas Operator | Dec 2024 |
| 499 | Ohio Kentucky Oil Corporation | Lexington, KY 40503 | Oil & Gas Operator | Dec 2024 |
| 500 | Oil & Gas MGMT Inc | Mount Pleasant, PA 15666-3304 | Oil & Gas Operator | Dec 2024 |