| 4801 | MACAR | Fayette County, PA | Gas Property | Dec 2024 |
| 4802 | MACINTYRE UNIT | Washington County, PA | Gas Property | Jun 2025 |
| 4803 | MACK | Greene County, PA | Oil & Gas Property | Jun 2025 |
| 4804 | MACK | Erie County, PA | Gas Property | Dec 1994 |
| 4805 | MACK | Elk County, PA | Oil & Gas Property | Dec 2018 |
| 4806 | MACKEY, R | Susquehanna County, PA | Gas Property | Jun 2025 |
| 4807 | MACKRELL UNIT | Butler County, PA | Gas Property | Jun 2025 |
| 4808 | MACLEAN (M-618) | Clearfield County, PA | Gas Property | Dec 2024 |
| 4809 | MACLEOD/NORRIS | Armstrong County, PA | Gas Property | Dec 2024 |
| 4810 | MAD DOG 2020 | Washington County, PA | Gas Property | Jun 2025 |
| 4811 | MAD DOG BRA | Bradford County, PA | Gas Property | Jun 2025 |
| 4812 | MADALYN C. HEILMAN | Armstrong County, PA | Gas Property | Dec 2024 |
| 4813 | MADDEN | Bradford County, PA | Gas Property | Oct 2024 |
| 4814 | MADIGAN FARMS UNIT A 1H | Bradford County, PA | Gas Property | Jun 2025 |
| 4815 | MADISON | Forest County, PA | Oil & Gas Property | Dec 2024 |
| 4816 | MAGA BEA | Beaver County, PA | Gas Property | Jun 2025 |
| 4817 | MAGAGNOTTI | Armstrong County, PA | Gas Property | Dec 2024 |
| 4818 | MAGGIE | Bradford County, PA | Gas Property | Jun 2025 |
| 4819 | MAGGIE SHROKMAN | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 4820 | MAGILL UNIT | Butler County, PA | Oil & Gas Property | Jun 2025 |
| 4821 | MAGNUM | Greene County, PA | Gas Property | Jun 2025 |
| 4822 | MAHAFFEY | Clearfield County, PA | Oil & Gas Property | Dec 2024 |
| 4823 | MAHAN | Warren County, PA | Oil Property | Dec 2016 |
| 4824 | MAHLE | Venango County, PA | Gas Property | Dec 2024 |
| 4825 | MAHLE | Clarion County, PA | Oil & Gas Property | Dec 2024 |
| 4826 | MAHLON J BYLER | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 4827 | MAHONING | Lawrence County, PA | Oil & Gas Property | Jun 2025 |
| 4828 | MAHONING | Armstrong County, PA | Oil & Gas Property | Dec 2024 |
| 4829 | MAHONING AMBROSIA | Lawrence County, PA | Oil & Gas Property | Jun 2025 |
| 4830 | MAHONING VALLEY MILLING CO | Jefferson County, PA | Gas Property | Dec 2024 |
| 4831 | MAHONING YEO | Lawrence County, PA | Oil & Gas Property | Jun 2025 |
| 4832 | MAIOLINI | Susquehanna County, PA | Gas Property | Jun 2025 |
| 4833 | MAKAYLA | Bradford County, PA | Gas Property | Jun 2025 |
| 4834 | MAKOSKY T | Susquehanna County, PA | Gas Property | Jun 2025 |
| 4835 | MAKUCH | Venango County, PA | Oil Property | Dec 2021 |
| 4836 | MALACHOSKY | Washington County, PA | Gas Property | Jun 2025 |
| 4837 | MALEK | Warren County, PA | Gas Property | Dec 2024 |
| 4838 | MALEK | Venango County, PA | Oil & Gas Property | Dec 2024 |
| 4839 | MALINKY | Fayette County, PA | Gas Property | Dec 2024 |
| 4840 | MALINKY UNIT | Washington County, PA | Gas Property | Jun 2025 |
| 4841 | MALJOVEC | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 4842 | MALLORY | Venango County, PA | Gas Property | Dec 2024 |
| 4843 | MALLORY | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 4844 | MALLORY | Lycoming County, PA | Gas Property | Jun 2025 |
| 4845 | MALLORY 1 | McKean County, PA | Oil & Gas Property | Dec 2022 |
| 4846 | MALLORY LOT | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 4847 | MALLORY W | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 4848 | MALLORY WARRANT 433 | McKean County, PA | Oil & Gas Property | Dec 2022 |
| 4849 | MALLORY-INTERSTATE | McKean County, PA | Oil & Gas Property | Dec 2022 |
| 4850 | MALLOY | Clearfield County, PA | Gas Property | Dec 2024 |
| 4851 | MAMMA BEAR | Washington County, PA | Gas Property | Jun 2025 |
| 4852 | MAMMOTH PARK 0 | Westmoreland County, PA | Oil & Gas Property | Dec 2024 |
| 4853 | MAMONT SOUTH | Westmoreland County, PA | Gas Property | Jun 2025 |
| 4854 | MANACK | Westmoreland County, PA | Oil & Gas Property | Dec 2024 |
| 4855 | MANAHAN | Bradford County, PA | Gas Property | Jun 2025 |
| 4856 | MANEVAL 296 | Tioga County, PA | Gas Property | Jun 2025 |
| 4857 | MANEY | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 4858 | MANGINI S&M | Westmoreland County, PA | Gas Property | Dec 2024 |
| 4859 | MANNING | Sullivan County, PA | Gas Property | Jun 2025 |
| 4860 | MANNING UNIT REIMILLER 1 MANNING | Wyoming County, PA | Gas Property | Jun 2025 |
| 4861 | MANOR | Indiana County, PA | Gas Property | Dec 2024 |
| 4862 | MANOR DEVELOPMENT | Armstrong County, PA | Gas Property | Dec 2024 |
| 4863 | MANOR REAL EST | McKean County, PA | Gas Property | Dec 2024 |
| 4864 | MANOR REAL ESTATE | Indiana County, PA | Gas Property | Dec 2024 |
| 4865 | MANOR REAL ESTATE | Armstrong County, PA | Gas Property | Dec 2024 |
| 4866 | MANROSS | Forest County, PA | Oil Property | Dec 2024 |
| 4867 | MANSFIELD | Armstrong County, PA | Gas Property | Dec 2024 |
| 4868 | MANTZ | McKean County, PA | Gas Property | Dec 2024 |
| 4869 | MANUEL UNIT | Butler County, PA | Gas Property | Jun 2025 |
| 4870 | MANUFACTURERS GAS | Elk County, PA | Gas Property | Dec 2024 |
| 4871 | MANULIFE INS CO 3 | McKean County, PA | Gas Property | Dec 2024 |
| 4872 | MANZER A 4 | Susquehanna County, PA | Gas Property | Jun 2025 |
| 4873 | MARBACH | Indiana County, PA | Gas Property | Dec 2024 |
| 4874 | MARBAKER | Susquehanna County, PA | Gas Property | Jun 2025 |
| 4875 | MARBURGER FARM DAIRY | Butler County, PA | Gas Property | Jun 2025 |
| 4876 | MARCHAND 3 | Indiana County, PA | Gas Property | Jun 2025 |
| 4877 | MARCHEZAK | Washington County, PA | Oil & Gas Property | Jun 2025 |
| 4878 | MARCHEZAK | Washington County, PA | Gas Property | Dec 2024 |
| 4879 | MARCHINI ZINGIESER | Bradford County, PA | Gas Property | Jun 2025 |
| 4880 | MARCHO W&M | Susquehanna County, PA | Gas Property | Jun 2025 |
| 4881 | MARCO | Westmoreland County, PA | Gas Property | Jun 2025 |
| 4882 | MARCO | Westmoreland County, PA | Gas Property | Dec 2024 |
| 4883 | MARCUCCI JONES | Bradford County, PA | Gas Property | Jun 2025 |
| 4884 | MARGARET | Crawford County, PA | Gas Property | Dec 2024 |
| 4885 | MARGARET | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 4886 | MARGARET | Armstrong County, PA | Gas Property | Dec 2024 |
| 4887 | MARGARET | Butler County, PA | Gas Property | Dec 2024 |
| 4888 | MARGARET | Indiana County, PA | Gas Property | Dec 2024 |
| 4889 | MARGARET E BECK | Indiana County, PA | Gas Property | Dec 2024 |
| 4890 | MARGARET E SHOUP | Greene County, PA | Gas Property | Dec 2022 |
| 4891 | MARGARET HAMILTON | Allegheny County, PA | Oil & Gas Property | Dec 2024 |
| 4892 | MARGARET L. GIBSON | Indiana County, PA | Gas Property | Dec 2024 |
| 4893 | MARGARIA PAUL UNIT | Washington County, PA | Gas Property | Jun 2025 |
| 4894 | MARGARIA RAYMOND UNIT | Washington County, PA | Gas Property | Jun 2025 |
| 4895 | MARGERY M STEPHENSON | Indiana County, PA | Gas Property | Dec 2024 |
| 4896 | MARIAN | Fayette County, PA | Gas Property | Dec 2024 |
| 4897 | MARIAN J BUTERBAUGH | Indiana County, PA | Gas Property | Dec 2024 |
| 4898 | MARIAN LASKOWSKI | Westmoreland County, PA | Gas Property | Dec 2023 |
| 4899 | MARIE C CAMPBELL | Armstrong County, PA | Gas Property | Dec 2024 |
| 4900 | MARIE FITZSIMMONS | Jefferson County, PA | Oil & Gas Property | Dec 2024 |