| 601 | MUNCE | Washington County, PA | Oil & Gas Property | Sep 2024 |
| 602 | MUNCE WILLIAM 10060 | Washington County, PA | Gas Property | Sep 2024 |
| 603 | MUNICIPAL AUTHORITY WESTMORELAND C | Westmoreland County, PA | Oil & Gas Property | Dec 2023 |
| 604 | MURACCA | Allegheny County, PA | Gas Property | Dec 2023 |
| 605 | MURDICK/MORGAN | Indiana County, PA | Gas Property | Dec 2023 |
| 606 | MURDOCK | Erie County, PA | Gas Property | Dec 2023 |
| 607 | MURIEL HOSTET | Indiana County, PA | Gas Property | Dec 2023 |
| 608 | MURPHY 110 | Washington County, PA | Gas Property | Dec 2023 |
| 609 | MURRAY | Clarion County, PA | Oil & Gas Property | Dec 2023 |
| 610 | MURRAY | Tioga County, PA | Gas Property | Sep 2024 |
| 611 | MURRAY ESTATE | Clearfield County, PA | Gas Property | Dec 2023 |
| 612 | MURRAY LEVINE | Westmoreland County, PA | Oil & Gas Property | Dec 2023 |
| 613 | MURRELL STATES | Indiana County, PA | Oil & Gas Property | Dec 2023 |
| 614 | MURRY HEIRS | Allegheny County, PA | Oil & Gas Property | Dec 2023 |
| 615 | MUSANTE M | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 616 | MUSGRAVE | Beaver County, PA | Oil & Gas Property | Dec 2023 |
| 617 | MUSKO | Armstrong County, PA | Gas Property | Dec 2023 |
| 618 | MUSKOVICH PHILIP 12080 | Washington County, PA | Gas Property | Sep 2024 |
| 619 | MUSOLINO NV62 | Washington County, PA | Gas Property | Sep 2024 |
| 620 | MUSSER | Indiana County, PA | Gas Property | Dec 2023 |
| 621 | MUSSER | Indiana County, PA | Oil & Gas Property | Dec 2023 |
| 622 | MUSSER | Clarion County, PA | Oil & Gas Property | Dec 2023 |
| 623 | MUSSER | Indiana County, PA | Gas Property | Dec 2023 |
| 624 | MUSSER ASSOCIATES | Indiana County, PA | Gas Property | Dec 2023 |
| 625 | MUSSER FOREST | Indiana County, PA | Gas Property | Dec 2023 |
| 626 | MUSSER FOREST | Indiana County, PA | Gas Property | Dec 2023 |
| 627 | MUSSER FOREST | Indiana County, PA | Gas Property | Dec 2023 |
| 628 | MUSSER FOREST | Indiana County, PA | Gas Property | Dec 2023 |
| 629 | MUTNANSKY UNIT | Fayette County, PA | Gas Property | Sep 2024 |
| 630 | MUZETTE MS | Forest County, PA | Oil & Gas Property | Dec 2023 |
| 631 | MY TB INVESTMENTS LLC 6076 | Tioga County, PA | Gas Property | Sep 2024 |
| 632 | MYERS | Venango County, PA | Gas Property | Dec 2023 |
| 633 | MYERS | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 634 | MYERS | Clearfield County, PA | Gas Property | Dec 2023 |
| 635 | MYERS | Washington County, PA | Gas Property | Dec 2023 |
| 636 | MYERS | Westmoreland County, PA | Gas Property | Dec 2023 |
| 637 | MYERS | Washington County, PA | Gas Property | Dec 2023 |
| 638 | MYERS | Mercer County, PA | Oil & Gas Property | Dec 2023 |
| 639 | MYERS 00 | Armstrong County, PA | Gas Property | Dec 2023 |
| 640 | MYERS R | Susquehanna County, PA | Gas Property | Sep 2024 |
| 641 | MYERS UNIT | Bradford County, PA | Gas Property | Sep 2024 |
| 642 | MYERS UNIT | Lycoming County, PA | Gas Property | Sep 2024 |
| 643 | MYERS UNIT | Venango County, PA | Gas Property | Dec 2023 |
| 644 | MYERS V | Venango County, PA | Oil & Gas Property | Dec 2023 |
| 645 | MYRTLE MACKENDRICK | Indiana County, PA | Gas Property | Dec 2023 |
| 646 | MYRTLE SHUMAKER | Armstrong County, PA | Gas Property | Dec 2023 |
| 647 | MYSTIC BROOKE | Indiana County, PA | Gas Property | Dec 2023 |