| 5101 | MAX TENN | Armstrong County, PA | Gas Property | Dec 2025 |
| 5102 | MAX THEODORE CRAIG | Indiana County, PA | Gas Property | Dec 2025 |
| 5103 | MAXSON | Potter County, PA | Gas Property | Dec 2024 |
| 5104 | MAXSON | Potter County, PA | Gas Property | Dec 2024 |
| 5105 | MAYO | Jefferson County, PA | Gas Property | Dec 2025 |
| 5106 | MAYO LOT | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 5107 | MAYS | Clarion County, PA | Oil & Gas Property | Dec 2020 |
| 5108 | MAZURE WILLIAM 12118 | Washington County, PA | Gas Property | Dec 2025 |
| 5109 | MAZZARA | Wyoming County, PA | Gas Property | Dec 2025 |
| 5110 | MC ANULTY | Indiana County, PA | Gas Property | Dec 2025 |
| 5111 | MCADOO UNIT | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 5112 | MCARDLE | Crawford County, PA | Oil & Gas Property | Dec 2025 |
| 5113 | MCAWLEY | Armstrong County, PA | Gas Property | Dec 2025 |
| 5114 | MCBETH | Fayette County, PA | Gas Property | Dec 2024 |
| 5115 | MCBETH | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 5116 | MCBROOM 1 | Westmoreland County, PA | Gas Property | Dec 2025 |
| 5117 | MCC PARTNERS | Washington County, PA | Oil & Gas Property | Dec 2025 |
| 5118 | MCCABE | Bradford County, PA | Gas Property | Dec 2025 |
| 5119 | MCCALL UNIT | Butler County, PA | Oil & Gas Property | Dec 2025 |
| 5120 | MCCALMONT | Butler County, PA | Oil & Gas Property | Dec 2016 |
| 5121 | MCCALMONT | Venango County, PA | Oil Property | Dec 2025 |
| 5122 | MCCARTHY UNIT MCCARTHY 1H | Wyoming County, PA | Gas Property | Dec 2025 |
| 5123 | MCCARTHY UNIT P&G WAREHOUSE 1 MCCARTHY | Wyoming County, PA | Gas Property | Dec 2025 |
| 5124 | MCCARTNEY | Mercer County, PA | Oil & Gas Property | Dec 2025 |
| 5125 | MCCAULEY M | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 5126 | MCCAY M-598 | Clearfield County, PA | Gas Property | Dec 2025 |
| 5127 | MCCHESNEY | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 5128 | MCCLAIN | Fayette County, PA | Oil & Gas Property | Dec 2025 |
| 5129 | MCCLAIN 8 | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 5130 | MCCLAY J | Washington County, PA | Oil Property | Dec 1993 |
| 5131 | MCCLEARY | Jefferson County, PA | Gas Property | Dec 2025 |
| 5132 | MCCLIMANS | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 5133 | MCCLOSKEY L | Mercer County, PA | Gas Property | Dec 2025 |
| 5134 | MCCLURE | Greene County, PA | Gas Property | Dec 2025 |
| 5135 | MCCLURE HEIRS | Greene County, PA | Gas Property | Dec 2025 |
| 5136 | MCCLURE M | Jefferson County, PA | Gas Property | Dec 2024 |
| 5137 | MCCONNAUGHEY | Indiana County, PA | Gas Property | Dec 2025 |
| 5138 | MCCONNELL | Indiana County, PA | Gas Property | Dec 2025 |
| 5139 | MCCONNELL | Bradford County, PA | Gas Property | Dec 2025 |
| 5140 | MCCONNELL UNIT MCCONNELL 1 | Wyoming County, PA | Gas Property | Dec 2025 |
| 5141 | MCCOOL | Warren County, PA | Oil & Gas Property | Dec 2001 |
| 5142 | MCCOOL & MCCOOL | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 5143 | MCCOOL BROS STONEHAM LEASE LOT 466 | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 5144 | MCCORMACK | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 5145 | MCCORMICK 00 | Indiana County, PA | Gas Property | Dec 2025 |
| 5146 | MCCOY | Forest County, PA | Oil & Gas Property | Dec 2024 |
| 5147 | MCCOY | Clarion County, PA | Oil & Gas Property | Dec 2020 |
| 5148 | MCCOY SMALL | Forest County, PA | Oil & Gas Property | Dec 2024 |
| 5149 | MCCRACKEN | Clearfield County, PA | Gas Property | Dec 2025 |
| 5150 | MCCRADY | Westmoreland County, PA | Oil & Gas Property | Dec 2025 |
| 5151 | MCCREA | Butler County, PA | Gas Property | Dec 2025 |
| 5152 | MCCREIGHT | Jefferson County, PA | Gas Property | Dec 2025 |
| 5153 | MCCULLOUGH | Mercer County, PA | Oil & Gas Property | Dec 2025 |
| 5154 | MCCULLOUGH | Crawford County, PA | Oil & Gas Property | Dec 2024 |
| 5155 | MCCULLOUGH | Indiana County, PA | Gas Property | Dec 2025 |
| 5156 | MCCULLOUGH | Westmoreland County, PA | Gas Property | Dec 2025 |
| 5157 | MCCULLOUGH | Mercer County, PA | Oil & Gas Property | Dec 2025 |
| 5158 | MCCULLOUGH H | Armstrong County, PA | Gas Property | Dec 2025 |
| 5159 | MCCULLOUGH IMOGENE | Armstrong County, PA | Gas Property | Dec 2025 |
| 5160 | MCDANEL BEA | Beaver County, PA | Gas Property | Dec 2025 |
| 5161 | MCDIVITT | Westmoreland County, PA | Gas Property | Dec 2025 |
| 5162 | MCDONOUGH | Wyoming County, PA | Gas Property | Dec 2025 |
| 5163 | MCDONOUGH | Washington County, PA | Gas Property | Dec 2025 |
| 5164 | MCDOWELL | Mercer County, PA | Oil & Gas Property | Dec 2025 |
| 5165 | MCDOWELL | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 5166 | MCELHINNY | Butler County, PA | Oil & Gas Property | Dec 2025 |
| 5167 | MCELHOES-BUCHANAN | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 5168 | MCELROY | Armstrong County, PA | Gas Property | Dec 2025 |
| 5169 | MCENANEY | Bradford County, PA | Gas Property | Dec 2025 |
| 5170 | MCFADDEN | Clearfield County, PA | Gas Property | Dec 2025 |
| 5171 | MCFALL UNIT | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 5172 | MCFARLAND | Lawrence County, PA | Gas Property | Dec 2025 |
| 5173 | MCFATE | Venango County, PA | Oil & Gas Property | Dec 2024 |
| 5174 | MCGARRELL | Forest County, PA | Oil Property | Dec 2021 |
| 5175 | MCGAUGHEY | Armstrong County, PA | Gas Property | Dec 2025 |
| 5176 | MCGAVIN | Wyoming County, PA | Gas Property | Dec 2025 |
| 5177 | MCGEE | Clearfield County, PA | Oil & Gas Property | Dec 2025 |
| 5178 | MCGILL | Fayette County, PA | Gas Property | Dec 2025 |
| 5179 | MCGOWAN | Washington County, PA | Gas Property | Dec 2025 |
| 5180 | MCGRAW | Wyoming County, PA | Gas Property | Dec 2025 |
| 5181 | MCGRAW | Warren County, PA | Gas Property | Dec 2025 |
| 5182 | MCGRAW | Indiana County, PA | Gas Property | Dec 2025 |
| 5183 | MCGROARTY | Bradford County, PA | Gas Property | Dec 2025 |
| 5184 | MCILVAINE CENTRAL PAD 15 | Westmoreland County, PA | Gas Property | Dec 2025 |
| 5185 | MCINTIRE | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 5186 | MCINTIRE | Indiana County, PA | Oil & Gas Property | Dec 2025 |
| 5187 | MCINTIRE | Indiana County, PA | Gas Property | Dec 2025 |
| 5188 | MCIVER MCALEVY | Crawford County, PA | Gas Property | Dec 2024 |
| 5189 | MCJUNKIN | Allegheny County, PA | Oil & Gas Property | Dec 2025 |
| 5190 | MCKAY | Armstrong County, PA | Gas Property | Dec 2025 |
| 5191 | MCKAY | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 5192 | MCKEAN | Mercer County, PA | Oil & Gas Property | Dec 2025 |
| 5193 | MCKEAN M | McKean County, PA | Oil & Gas Property | Dec 2025 |
| 5194 | MCKEEHEN | Clearfield County, PA | Gas Property | Dec 2025 |
| 5195 | MCKINLEY | Armstrong County, PA | Oil & Gas Property | Dec 2025 |
| 5196 | MCKOWN M | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 5197 | MCLAUGHLIN | Westmoreland County, PA | Gas Property | Dec 2025 |
| 5198 | MCLAUGHLIN J | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 5199 | MCMAHAN S | Warren County, PA | Oil & Gas Property | Dec 2025 |
| 5200 | MCMAHON | Bradford County, PA | Gas Property | Dec 2025 |