| 4601 | MAC 8H | Greene County, PA | Gas Property | Feb 2024 |
| 4602 | MAC 9 | Greene County, PA | Gas Property | Feb 2024 |
| 4603 | MAC NORTH | Lycoming County, PA | Gas Property | Feb 2024 |
| 4604 | MACAR | Fayette County, PA | Gas Property | Dec 2023 |
| 4605 | MACINTYRE UNIT | Washington County, PA | Gas Property | Feb 2024 |
| 4606 | MACK | Greene County, PA | Oil & Gas Property | Mar 2024 |
| 4607 | MACK | Elk County, PA | Oil & Gas Property | Dec 2018 |
| 4608 | MACK | Erie County, PA | Gas Property | Dec 1994 |
| 4609 | MACKEY, R | Susquehanna County, PA | Gas Property | Mar 2024 |
| 4610 | MACKRELL UNIT | Butler County, PA | Gas Property | Mar 2024 |
| 4611 | MACLEAN (M-618) | Clearfield County, PA | Gas Property | Dec 2023 |
| 4612 | MACLEOD/NORRIS | Armstrong County, PA | Gas Property | Dec 2023 |
| 4613 | MAD DOG 2020 | Washington County, PA | Gas Property | Feb 2024 |
| 4614 | MAD DOG BRA | Bradford County, PA | Gas Property | Dec 2023 |
| 4615 | MADALYN C. HEILMAN | Armstrong County, PA | Gas Property | Dec 2023 |
| 4616 | MADDEN | Bradford County, PA | Gas Property | Oct 2023 |
| 4617 | MADISON | Forest County, PA | Oil & Gas Property | Dec 2023 |
| 4618 | MAGA BEA | Beaver County, PA | Gas Property | Mar 2024 |
| 4619 | MAGAGNOTTI | Armstrong County, PA | Gas Property | Dec 2023 |
| 4620 | MAGGIE | Bradford County, PA | Gas Property | Feb 2024 |
| 4621 | MAGGIE SHROKMAN | Indiana County, PA | Oil & Gas Property | Dec 2023 |
| 4622 | MAGILL UNIT | Butler County, PA | Oil & Gas Property | Mar 2024 |
| 4623 | MAGNUM | Greene County, PA | Gas Property | Feb 2024 |
| 4624 | MAHAFFEY | Clearfield County, PA | Oil & Gas Property | Dec 2023 |
| 4625 | MAHAN | Warren County, PA | Oil Property | Dec 2016 |
| 4626 | MAHLE | Venango County, PA | Gas Property | Dec 2023 |
| 4627 | MAHLE | Clarion County, PA | Oil & Gas Property | Dec 2021 |
| 4628 | MAHLON J BYLER | Indiana County, PA | Oil & Gas Property | Dec 2023 |
| 4629 | MAHONING | Armstrong County, PA | Oil & Gas Property | Dec 2023 |
| 4630 | MAHONING | Lawrence County, PA | Oil & Gas Property | Mar 2024 |
| 4631 | MAHONING AMBROSIA | Lawrence County, PA | Gas Property | Mar 2024 |
| 4632 | MAHONING VALLEY MILLING CO | Jefferson County, PA | Gas Property | Dec 2023 |
| 4633 | MAHONING YEO | Lawrence County, PA | Oil & Gas Property | Mar 2024 |
| 4634 | MAIOLINI | Susquehanna County, PA | Gas Property | Mar 2024 |
| 4635 | MAKAYLA | Bradford County, PA | Gas Property | Feb 2024 |
| 4636 | MAKOSKY T | Susquehanna County, PA | Gas Property | Mar 2024 |
| 4637 | MAKUCH | Venango County, PA | Oil Property | Dec 2021 |
| 4638 | MALACHOSKY | Washington County, PA | Gas Property | Feb 2024 |
| 4639 | MALEK | Venango County, PA | Oil & Gas Property | Dec 2023 |
| 4640 | MALEK | Warren County, PA | Gas Property | Dec 2023 |
| 4641 | MALINKY | Fayette County, PA | Gas Property | Dec 2023 |
| 4642 | MALINKY UNIT | Washington County, PA | Gas Property | Feb 2024 |
| 4643 | MALJOVEC | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 4644 | MALLORY | Venango County, PA | Gas Property | Dec 2021 |
| 4645 | MALLORY | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 4646 | MALLORY 1 | McKean County, PA | Oil & Gas Property | Dec 2022 |
| 4647 | MALLORY LOT | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 4648 | MALLORY W | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 4649 | MALLORY-INTERSTATE | McKean County, PA | Oil & Gas Property | Dec 2022 |
| 4650 | MALLOY | Clearfield County, PA | Gas Property | Dec 2023 |
| 4651 | MAMMA BEAR | Washington County, PA | Gas Property | Feb 2024 |
| 4652 | MAMMOTH PARK 0 | Westmoreland County, PA | Oil & Gas Property | Dec 2023 |
| 4653 | MAMONT SOUTH | Westmoreland County, PA | Gas Property | Mar 2024 |
| 4654 | MANACK | Westmoreland County, PA | Oil & Gas Property | Dec 2023 |
| 4655 | MANAHAN | Bradford County, PA | Gas Property | Feb 2024 |
| 4656 | MANEVAL 296 | Tioga County, PA | Gas Property | Mar 2024 |
| 4657 | MANEY | Warren County, PA | Oil & Gas Property | Dec 2023 |
| 4658 | MANGINI S&M | Westmoreland County, PA | Gas Property | Dec 2023 |
| 4659 | MANNING | Sullivan County, PA | Gas Property | Feb 2024 |
| 4660 | MANNING UNIT REIMILLER 1 MANNING | Wyoming County, PA | Gas Property | Mar 2024 |
| 4661 | MANOR | Indiana County, PA | Gas Property | Dec 2023 |
| 4662 | MANOR DEVELOPMENT | Armstrong County, PA | Gas Property | Dec 2023 |
| 4663 | MANOR REAL ESTATE | Armstrong County, PA | Gas Property | Dec 2023 |
| 4664 | MANOR REAL ESTATE | McKean County, PA | Gas Property | Dec 2023 |
| 4665 | MANOR REAL ESTATE | Indiana County, PA | Gas Property | Dec 2023 |
| 4666 | MANSFIELD | Armstrong County, PA | Gas Property | Dec 2023 |
| 4667 | MANTZ | McKean County, PA | Gas Property | Dec 2022 |
| 4668 | MANUEL UNIT | Butler County, PA | Gas Property | Mar 2024 |
| 4669 | MANUFACTURERS GAS | Elk County, PA | Gas Property | Dec 2023 |
| 4670 | MANULIFE INS CO 3 | McKean County, PA | Gas Property | Dec 2023 |
| 4671 | MARBACH | Indiana County, PA | Gas Property | Dec 2023 |
| 4672 | MARBAKER | Susquehanna County, PA | Gas Property | Oct 2023 |
| 4673 | MARBURGER FARM DAIRY | Butler County, PA | Gas Property | Mar 2024 |
| 4674 | MARCHAND 3 | Indiana County, PA | Gas Property | Mar 2024 |
| 4675 | MARCHEZAK | Washington County, PA | Oil & Gas Property | Feb 2024 |
| 4676 | MARCHEZAK | Washington County, PA | Gas Property | Dec 2023 |
| 4677 | MARCHINI ZINGIESER | Bradford County, PA | Gas Property | Mar 2024 |
| 4678 | MARCHO W&M | Susquehanna County, PA | Gas Property | Mar 2024 |
| 4679 | MARCO | Westmoreland County, PA | Gas Property | Mar 2024 |
| 4680 | MARCO | Westmoreland County, PA | Gas Property | Dec 2023 |
| 4681 | MARCUCCI JONES | Bradford County, PA | Gas Property | Mar 2024 |
| 4682 | MARGARET | Indiana County, PA | Oil & Gas Property | Dec 2023 |
| 4683 | MARGARET | Armstrong County, PA | Gas Property | Dec 2023 |
| 4684 | MARGARET | Butler County, PA | Gas Property | Dec 2023 |
| 4685 | MARGARET | Indiana County, PA | Gas Property | Dec 2023 |
| 4686 | MARGARET | Crawford County, PA | Gas Property | Dec 2023 |
| 4687 | MARGARET E BECK | Indiana County, PA | Gas Property | Dec 2023 |
| 4688 | MARGARET E SHOUP | Greene County, PA | Gas Property | Dec 2022 |
| 4689 | MARGARET HAMILTON | Allegheny County, PA | Oil & Gas Property | Dec 2023 |
| 4690 | MARGARET L. GIBSON | Indiana County, PA | Gas Property | Dec 2023 |
| 4691 | MARGARIA PAUL UNIT | Washington County, PA | Gas Property | Feb 2024 |
| 4692 | MARGARIA RAYMOND UNIT | Washington County, PA | Gas Property | Feb 2024 |
| 4693 | MARGERY M STEPHENSON | Indiana County, PA | Gas Property | Dec 2023 |
| 4694 | MARIAN | Fayette County, PA | Gas Property | Dec 2023 |
| 4695 | MARIAN J BUTERBAUGH | Indiana County, PA | Gas Property | Dec 2023 |
| 4696 | MARIAN LASKOWSKI | Westmoreland County, PA | Gas Property | Dec 2023 |
| 4697 | MARIE C CAMPBELL | Armstrong County, PA | Gas Property | Dec 2023 |
| 4698 | MARIE FITZSIMMONS | Jefferson County, PA | Oil & Gas Property | Dec 2023 |
| 4699 | MARIE SNYDER | Clearfield County, PA | Gas Property | Dec 2023 |
| 4700 | MARINI | Armstrong County, PA | Gas Property | Dec 2023 |