| 501 | MOHNEY | Jefferson County, PA | Gas Property | Dec 2023 |
| 502 | MOHNEY | Jefferson County, PA | Oil & Gas Property | Dec 2023 |
| 503 | MOHR | Greene County, PA | Gas Property | Feb 2024 |
| 504 | MOJO | Washington County, PA | Gas Property | Feb 2024 |
| 505 | MOLLY J | Bradford County, PA | Gas Property | Feb 2024 |
| 506 | MOLNAR M | Susquehanna County, PA | Gas Property | Feb 2024 |
| 507 | MOLNAR UNIT | Washington County, PA | Oil & Gas Property | Dec 2013 |
| 508 | MOMYER | Westmoreland County, PA | Gas Property | Dec 2023 |
| 509 | MONARCH 591 | Jefferson County, PA | Gas Property | Feb 2024 |
| 510 | MONARCH PARK TR-76 | Venango County, PA | Oil Property | Dec 2018 |
| 511 | MONO | Washington County, PA | Gas Property | Feb 2024 |
| 512 | MONOCEROS | Butler County, PA | Gas Property | Feb 2024 |
| 513 | MONRO (03-142-0 | Bradford County, PA | Gas Property | Feb 2024 |
| 514 | MONROE C FENTON | Indiana County, PA | Gas Property | Dec 2023 |
| 515 | MONROEVILLE PARK | Allegheny County, PA | Oil & Gas Property | Dec 2023 |
| 516 | MONROSS | Forest County, PA | Oil Property | Dec 2023 |
| 517 | MONTEPARTE | Westmoreland County, PA | Oil & Gas Property | Dec 2023 |
| 518 | MONTGOMERY | Washington County, PA | Oil Property | Dec 1999 |
| 519 | MONTGOMERY | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 520 | MONTGOMERY | Clarion County, PA | Gas Property | Dec 2023 |
| 521 | MONTGOMERY | Armstrong County, PA | Gas Property | Aug 2019 |
| 522 | MOOD | Fayette County, PA | Gas Property | Dec 2023 |
| 523 | MOODY | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 524 | MOODY BRA | Bradford County, PA | Gas Property | Feb 2024 |
| 525 | MOONEY | Greene County, PA | Oil & Gas Property | Dec 2023 |
| 526 | MOONEY | Greene County, PA | Oil & Gas Property | Feb 2024 |
| 527 | MOORE | McKean County, PA | Oil Property | Dec 2023 |
| 528 | MOORE | Lawrence County, PA | Gas Property | Dec 2023 |
| 529 | MOORE | Fayette County, PA | Oil & Gas Property | Dec 2023 |
| 530 | MOORE | Jefferson County, PA | Gas Property | Dec 2023 |
| 531 | MOORE | Greene County, PA | Gas Property | Feb 2024 |
| 532 | MOORE 1 | Susquehanna County, PA | Gas Property | Feb 2024 |
| 533 | MOORE FARM | Bradford County, PA | Gas Property | Feb 2024 |
| 534 | MOORE PARK 12065 | Washington County, PA | Gas Property | Feb 2024 |
| 535 | MOORE RICHARD UNIT | Washington County, PA | Gas Property | Feb 2024 |
| 536 | MOORE, S | Susquehanna County, PA | Gas Property | Feb 2024 |
| 537 | MOOSE | Bradford County, PA | Gas Property | Feb 2024 |
| 538 | MOOSE | Mercer County, PA | Gas Property | Dec 2023 |
| 539 | MORAVEK | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 540 | MORELAND | Crawford County, PA | Oil & Gas Property | Dec 2023 |
| 541 | MORETZ 03 036 | Bradford County, PA | Gas Property | Feb 2024 |
| 542 | MORGAN | Warren County, PA | Oil & Gas Property | Dec 2019 |
| 543 | MORGAN | Allegheny County, PA | Oil & Gas Property | Dec 2023 |
| 544 | MORGAN | Armstrong County, PA | Gas Property | Dec 2023 |
| 545 | MORGAN | Washington County, PA | Oil & Gas Property | Dec 2021 |
| 546 | MORGAN 01 07 | Bradford County, PA | Gas Property | Feb 2024 |
| 547 | MORITZ EDWARD UNIT | Washington County, PA | Gas Property | Feb 2024 |
| 548 | MORRIS | McKean County, PA | Oil Property | Dec 2022 |
| 549 | MORRIS | Armstrong County, PA | Gas Property | Dec 2023 |
| 550 | MORRIS STERN | Indiana County, PA | Gas Property | Dec 2021 |
| 551 | MORRISON | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 552 | MORRISON | Venango County, PA | Oil Property | Dec 1999 |
| 553 | MORRISON | Warren County, PA | Oil & Gas Property | Dec 2021 |
| 554 | MORRISON | Warren County, PA | Gas Property | Dec 2021 |
| 555 | MORRISON RUN LOT 4 | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 556 | MORROW | Greene County, PA | Gas Property | Dec 2023 |
| 557 | MORROW | Butler County, PA | Gas Property | Feb 2024 |
| 558 | MORSE | Bradford County, PA | Gas Property | Feb 2024 |
| 559 | MORTON | Greene County, PA | Oil & Gas Property | Feb 2024 |
| 560 | MOSER | Lycoming County, PA | Gas Property | Feb 2024 |
| 561 | MOSER | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 562 | MOSER WARRANT 3767 | McKean County, PA | Oil & Gas Property | Dec 2008 |
| 563 | MOSHANNON DCNR TRACT 826 | Clearfield County, PA | Gas Property | Dec 2016 |
| 564 | MOUNTAIN GATHERING | Butler County, PA | Oil & Gas Property | Feb 2024 |
| 565 | MOUNTAIN MEADOW | Lycoming County, PA | Gas Property | Feb 2024 |
| 566 | MOUNTAIN RUN HUNTING CLUB 02 153 0 | Tioga County, PA | Gas Property | Feb 2024 |
| 567 | MOUNTAIN TRAILS INC | Armstrong County, PA | Gas Property | Dec 2023 |
| 568 | MOURER | Butler County, PA | Oil & Gas Property | Feb 2024 |
| 569 | MOWL CHARLES 11760 | Washington County, PA | Gas Property | Feb 2024 |
| 570 | MOWREY | Clearfield County, PA | Gas Property | Dec 2023 |
| 571 | MOWREY | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 572 | MOWRY | Bradford County, PA | Gas Property | Feb 2024 |
| 573 | MOYER BRA | Bradford County, PA | Gas Property | Feb 2024 |
| 574 | MOYLAN | Warren County, PA | Oil & Gas Property | Dec 2022 |
| 575 | MPC SUL | Sullivan County, PA | Gas Property | Feb 2024 |
| 576 | MROC PAD | McKean County, PA | Gas Property | Feb 2024 |
| 577 | MT SAVAGE REF | Armstrong County, PA | Gas Property | Dec 2023 |
| 578 | MT SAVAGE REFRAC | Clarion County, PA | Gas Property | Dec 2023 |
| 579 | MTL 1 | Bradford County, PA | Gas Property | Feb 2024 |
| 580 | MTL 4H | Bradford County, PA | Gas Property | Feb 2024 |
| 581 | MTL 6HC | Bradford County, PA | Gas Property | Feb 2024 |
| 582 | MUDLICK | Armstrong County, PA | Gas Property | Feb 2024 |
| 583 | MUDRICK | Washington County, PA | Gas Property | Dec 2023 |
| 584 | MULLEN | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 585 | MULLOY | Susquehanna County, PA | Gas Property | Feb 2024 |
| 586 | MUMAU | Indiana County, PA | Gas Property | Dec 2023 |
| 587 | MUMAU REVOCABLE TRUST 00 | Westmoreland County, PA | Oil & Gas Property | Dec 2023 |
| 588 | MUMFORD | Crawford County, PA | Gas Property | Dec 2023 |
| 589 | MUNCE | Washington County, PA | Oil & Gas Property | Feb 2024 |
| 590 | MUNCE WILLIAM 10060 | Washington County, PA | Gas Property | Feb 2024 |
| 591 | MUNICIPAL AUTHORITY WESTMORELAND C | Westmoreland County, PA | Oil & Gas Property | Dec 2023 |
| 592 | MURACCA | Allegheny County, PA | Gas Property | Dec 2023 |
| 593 | MURDICK-MORGAN | Indiana County, PA | Gas Property | Dec 2023 |
| 594 | MURDOCK | Erie County, PA | Gas Property | Dec 2023 |
| 595 | MURIEL HOSTET | Indiana County, PA | Gas Property | Dec 2023 |
| 596 | MURPHY 110 | Washington County, PA | Gas Property | Dec 2023 |
| 597 | MURRAY | Clarion County, PA | Oil & Gas Property | Dec 2023 |
| 598 | MURRAY | Tioga County, PA | Gas Property | Feb 2024 |
| 599 | MURRAY ESTATE | Clearfield County, PA | Gas Property | Dec 2023 |
| 600 | MURRAY LEVINE | Westmoreland County, PA | Oil & Gas Property | Dec 2023 |