| 4901 | MACLEAN (M-618) | Clearfield County, PA | Gas Property | Dec 2025 |
| 4902 | MACLEOD/NORRIS | Armstrong County, PA | Gas Property | Dec 2025 |
| 4903 | MAD DOG 2020 | Washington County, PA | Gas Property | Dec 2025 |
| 4904 | MAD DOG BRA | Bradford County, PA | Gas Property | Dec 2025 |
| 4905 | MADALYN C. HEILMAN | Armstrong County, PA | Gas Property | Dec 2025 |
| 4906 | MADDEN | Bradford County, PA | Gas Property | Oct 2024 |
| 4907 | MADIGAN FARMS UNIT A 1H | Bradford County, PA | Gas Property | Dec 2025 |
| 4908 | MADISON | Forest County, PA | Oil & Gas Property | Dec 2024 |
| 4909 | MAGA BEA | Beaver County, PA | Gas Property | Dec 2025 |
| 4910 | MAGAGNOTTI | Armstrong County, PA | Gas Property | Dec 2025 |
| 4911 | MAGGIE | Bradford County, PA | Gas Property | Dec 2025 |
| 4912 | MAGGIE SHROKMAN | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 4913 | MAGILL UNIT | Butler County, PA | Oil & Gas Property | Dec 2025 |
| 4914 | MAGNUM | Greene County, PA | Gas Property | Dec 2025 |
| 4915 | MAHAFFEY | Clearfield County, PA | Oil & Gas Property | Dec 2025 |
| 4916 | MAHAN | Warren County, PA | Oil Property | Dec 2016 |
| 4917 | MAHLE | Clarion County, PA | Oil & Gas Property | Dec 2024 |
| 4918 | MAHLE | Venango County, PA | Gas Property | Dec 2024 |
| 4919 | MAHLON J BYLER | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 4920 | MAHONING | Lawrence County, PA | Oil & Gas Property | Dec 2025 |
| 4921 | MAHONING | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 4922 | MAHONING AMBROSIA | Lawrence County, PA | Oil & Gas Property | Dec 2025 |
| 4923 | MAHONING VALLEY MILLING CO | Jefferson County, PA | Gas Property | Dec 2025 |
| 4924 | MAHONING YEO | Lawrence County, PA | Oil & Gas Property | Dec 2025 |
| 4925 | MAIOLINI | Susquehanna County, PA | Gas Property | Dec 2025 |
| 4926 | MAKAYLA | Bradford County, PA | Gas Property | Dec 2025 |
| 4927 | MAKOSKY T | Susquehanna County, PA | Gas Property | Dec 2025 |
| 4928 | MAKUCH | Venango County, PA | Oil Property | Dec 2021 |
| 4929 | MALACHOSKY | Washington County, PA | Gas Property | Dec 2025 |
| 4930 | MALEK | Venango County, PA | Oil & Gas Property | Dec 2025 |
| 4931 | MALEK | Warren County, PA | Gas Property | Dec 2025 |
| 4932 | MALINKY | Fayette County, PA | Gas Property | Dec 2025 |
| 4933 | MALINKY UNIT | Washington County, PA | Gas Property | Dec 2025 |
| 4934 | MALJOVEC | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 4935 | MALLORY | Venango County, PA | Gas Property | Dec 2024 |
| 4936 | MALLORY | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 4937 | MALLORY | Lycoming County, PA | Gas Property | Dec 2025 |
| 4938 | MALLORY 1 | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 4939 | MALLORY LOT | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 4940 | MALLORY W | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 4941 | MALLORY WARRANT 433 | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 4942 | MALLORY-INTERSTATE | McKean County, PA | Oil & Gas Property | Dec 2023 |
| 4943 | MALLOY | Clearfield County, PA | Gas Property | Dec 2025 |
| 4944 | MAMMA BEAR | Washington County, PA | Gas Property | Dec 2025 |
| 4945 | MAMMOTH PARK 0 | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 4946 | MAMONT SOUTH | Westmoreland County, PA | Gas Property | Dec 2025 |
| 4947 | MANACK | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 4948 | MANAHAN | Bradford County, PA | Gas Property | Dec 2025 |
| 4949 | MANEVAL 296 | Tioga County, PA | Gas Property | Dec 2025 |
| 4950 | MANEY | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 4951 | MANNING | Sullivan County, PA | Gas Property | Dec 2025 |
| 4952 | MANNING UNIT REIMILLER 1 MANNING | Wyoming County, PA | Gas Property | Dec 2025 |
| 4953 | MANOR | Indiana County, PA | Gas Property | Dec 2025 |
| 4954 | MANOR DEVELOPMENT | Armstrong County, PA | Gas Property | Dec 2025 |
| 4955 | MANOR REAL EST | McKean County, PA | Gas Property | Dec 2025 |
| 4956 | MANOR REAL ESTATE | Indiana County, PA | Gas Property | Dec 2025 |
| 4957 | MANOR REAL ESTATE | Armstrong County, PA | Gas Property | Dec 2025 |
| 4958 | MANROSS | Forest County, PA | Oil Property | Dec 2025 |
| 4959 | MANSFIELD | Armstrong County, PA | Gas Property | Dec 2025 |
| 4960 | MANTZ | McKean County, PA | Gas Property | Dec 2024 |
| 4961 | MANUEL UNIT | Butler County, PA | Gas Property | Dec 2025 |
| 4962 | MANUFACTURERS GAS | Elk County, PA | Gas Property | Dec 2025 |
| 4963 | MANULIFE INS CO 3 | McKean County, PA | Gas Property | Dec 2025 |
| 4964 | MANZER A 4 | Susquehanna County, PA | Gas Property | Dec 2025 |
| 4965 | MARBACH | Indiana County, PA | Gas Property | Dec 2025 |
| 4966 | MARBAKER | Susquehanna County, PA | Gas Property | Dec 2025 |
| 4967 | MARBURGER FARM DAIRY | Butler County, PA | Gas Property | Dec 2025 |
| 4968 | MARCHAND 3 | Indiana County, PA | Gas Property | Dec 2025 |
| 4969 | MARCHEZAK | Washington County, PA | Gas Property | Dec 2025 |
| 4970 | MARCHEZAK | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 4971 | MARCHINI ZINGIESER | Bradford County, PA | Gas Property | Sep 2025 |
| 4972 | MARCHO W&M | Susquehanna County, PA | Gas Property | Dec 2025 |
| 4973 | MARCO | Westmoreland County, PA | Gas Property | Dec 2025 |
| 4974 | MARCO | Westmoreland County, PA | Gas Property | Dec 2025 |
| 4975 | MARCUCCI JONES | Bradford County, PA | Gas Property | Dec 2025 |
| 4976 | MARGARET | Crawford County, PA | Gas Property | Dec 2024 |
| 4977 | MARGARET | Indiana County, PA | Gas Property | Dec 2025 |
| 4978 | MARGARET | Armstrong County, PA | Gas Property | Dec 2025 |
| 4979 | MARGARET | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 4980 | MARGARET | Butler County, PA | Gas Property | Dec 2025 |
| 4981 | MARGARET E BECK | Indiana County, PA | Gas Property | Dec 2025 |
| 4982 | MARGARET E SHOUP | Greene County, PA | Gas Property | Dec 2022 |
| 4983 | MARGARET HAMILTON | Allegheny County, PA | Oil & Gas Property | Dec 2025 |
| 4984 | MARGARET L. GIBSON | Indiana County, PA | Gas Property | Dec 2025 |
| 4985 | MARGARIA PAUL UNIT | Washington County, PA | Gas Property | Dec 2025 |
| 4986 | MARGARIA RAYMOND UNIT | Washington County, PA | Gas Property | Dec 2025 |
| 4987 | MARGERY M STEPHENSON | Indiana County, PA | Gas Property | Dec 2025 |
| 4988 | MARIAN | Fayette County, PA | Gas Property | Dec 2025 |
| 4989 | MARIAN J BUTERBAUGH | Indiana County, PA | Gas Property | Dec 2025 |
| 4990 | MARIAN LASKOWSKI | Westmoreland County, PA | Gas Property | Dec 2025 |
| 4991 | MARIE C CAMPBELL | Armstrong County, PA | Gas Property | Dec 2025 |
| 4992 | MARIE FITZSIMMONS | Jefferson County, PA | Oil & Gas Property | Dec 2025 |
| 4993 | MARIE SNYDER | Clearfield County, PA | Gas Property | Dec 2025 |
| 4994 | MARINI | Armstrong County, PA | Gas Property | Dec 2025 |
| 4995 | MARIS | Susquehanna County, PA | Gas Property | Dec 2025 |
| 4996 | MARJORIE C YANITY | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 4997 | MARK A ANTHONY | Indiana County, PA | Gas Property | Dec 2025 |
| 4998 | MARK A ANTHONY | Indiana County, PA | Gas Property | Dec 2025 |
| 4999 | MARK A SNYDER ET UX | Armstrong County, PA | Gas Property | Dec 2025 |
| 5000 | MARK E DIXON | Indiana County, PA | Oil & Gas Property | Dec 2025 |