| 201 | MARTINCIC | Washington County, PA | Gas Property | Dec 2024 |
| 202 | MARTZ | Venango County, PA | Oil & Gas Property | Dec 2024 |
| 203 | MARVIN | Susquehanna County, PA | Gas Property | May 2025 |
| 204 | MARVIN RUL | Clarion County, PA | Gas Property | Dec 2024 |
| 205 | MARY BASH | Westmoreland County, PA | Gas Property | Dec 2024 |
| 206 | MARY BOGDANSKI | Indiana County, PA | Gas Property | Dec 2024 |
| 207 | MARY CONARRO C | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 208 | MARY CROYLE | Clarion County, PA | Gas Property | Dec 2024 |
| 209 | MARY ELLEN HULLIHEN HEIRS | Clearfield County, PA | Gas Property | Dec 2024 |
| 210 | MARY ETTA DUNMIRE | Westmoreland County, PA | Oil & Gas Property | Dec 2024 |
| 211 | MARY HART RINN | Indiana County, PA | Gas Property | Dec 2024 |
| 212 | MARY JAMES | Elk County, PA | Gas Property | Dec 2024 |
| 213 | MARY M | Clearfield County, PA | Gas Property | Dec 2024 |
| 214 | MARY M FLEMING | Indiana County, PA | Gas Property | Dec 2024 |
| 215 | MARY MCGEE | Clearfield County, PA | Gas Property | Dec 2024 |
| 216 | MARY PAUKOVICH | Indiana County, PA | Gas Property | Dec 2024 |
| 217 | MARY RO | Venango County, PA | Oil & Gas Property | Dec 2024 |
| 218 | MARYNCHAK UNIT | Washington County, PA | Gas Property | May 2025 |
| 219 | MASE MONTE | Tioga County, PA | Gas Property | May 2025 |
| 220 | MASSO | Susquehanna County, PA | Gas Property | May 2025 |
| 221 | MAST | Lawrence County, PA | Oil & Gas Property | Dec 2024 |
| 222 | MAST M | Clarion County, PA | Oil & Gas Property | Dec 2024 |
| 223 | MASTER SPLINTER | Washington County, PA | Gas Property | May 2025 |
| 224 | MASTERBRAY | Fayette County, PA | Oil & Gas Property | May 2025 |
| 225 | MASTERS | Venango County, PA | Oil Property | Dec 2024 |
| 226 | MATCHETT FARM 12122 | Washington County, PA | Gas Property | May 2025 |
| 227 | MATEER | Armstrong County, PA | Gas Property | Dec 2024 |
| 228 | MATEER/SBI | Armstrong County, PA | Gas Property | Dec 2024 |
| 229 | MATHEWS | McKean County, PA | Gas Property | Dec 2024 |
| 230 | MATHEWS | Greene County, PA | Oil & Gas Property | May 2025 |
| 231 | MATHEWS UNIT | Crawford County, PA | Gas Property | Dec 2024 |
| 232 | MATSON | Forest County, PA | Oil & Gas Property | Dec 2024 |
| 233 | MATSON | Jefferson County, PA | Oil & Gas Property | Dec 2024 |
| 234 | MATSON 193 | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 235 | MATSON MATSON | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 236 | MATT | Sullivan County, PA | Gas Property | May 2025 |
| 237 | MATT DALE | Westmoreland County, PA | Gas Property | Dec 2024 |
| 238 | MATT WILL FARMS | Bradford County, PA | Gas Property | May 2025 |
| 239 | MATTESON | Potter County, PA | Gas Property | Dec 2024 |
| 240 | MATTHEW ANTHONY | Armstrong County, PA | Gas Property | Dec 2024 |
| 241 | MATTHEW HEIRS | Allegheny County, PA | Oil & Gas Property | Dec 2024 |
| 242 | MATTHEW MILLER | Armstrong County, PA | Gas Property | Feb 2025 |
| 243 | MATTHEWS | Greene County, PA | Oil & Gas Property | May 2025 |
| 244 | MATTIE | Armstrong County, PA | Gas Property | Dec 2024 |
| 245 | MATTOCKS UNIT MATTOCKS | Wyoming County, PA | Gas Property | May 2025 |
| 246 | MATTY/MOMYER | Westmoreland County, PA | Gas Property | May 2025 |
| 247 | MATWAY | Fayette County, PA | Gas Property | Dec 2024 |
| 248 | MATZ 824 | Tioga County, PA | Gas Property | May 2025 |
| 249 | MAUDE E. CUMMIN | Armstrong County, PA | Gas Property | Dec 2024 |
| 250 | MAURICE | Armstrong County, PA | Gas Property | Dec 2024 |
| 251 | MAURICE M SINAN ET UX | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 252 | MAVILLA 42 | Washington County, PA | Oil & Gas Property | Dec 2024 |
| 253 | MAWC TR | Westmoreland County, PA | Gas Property | Dec 2024 |
| 254 | MAWC TR 1 | Westmoreland County, PA | Gas Property | Dec 2024 |
| 255 | MAWC TR 2 | Westmoreland County, PA | Gas Property | May 2025 |
| 256 | MAWC TR 51 HUTCHIN | Westmoreland County, PA | Gas Property | Dec 2024 |
| 257 | MAWC TRACT 3 | Westmoreland County, PA | Gas Property | Dec 2024 |
| 258 | MAX M LLOYD | Indiana County, PA | Gas Property | Dec 2024 |
| 259 | MAX M SHOFESTALL | Clarion County, PA | Gas Property | Dec 2024 |
| 260 | MAX TENN | Armstrong County, PA | Gas Property | Dec 2024 |
| 261 | MAX THEODORE CRAIG | Indiana County, PA | Gas Property | Dec 2024 |
| 262 | MAXSON | Potter County, PA | Gas Property | Dec 2024 |
| 263 | MAXSON | Potter County, PA | Gas Property | Dec 2024 |
| 264 | MAYO | Jefferson County, PA | Gas Property | Dec 2024 |
| 265 | MAYO LOT | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 266 | MAYS | Clarion County, PA | Oil & Gas Property | Dec 2020 |
| 267 | MAZURE WILLIAM 12118 | Washington County, PA | Gas Property | May 2025 |
| 268 | MAZZARA | Wyoming County, PA | Gas Property | May 2025 |
| 269 | MC ANULTY | Indiana County, PA | Gas Property | Dec 2024 |
| 270 | MCADOO UNIT | Washington County, PA | Oil & Gas Property | May 2025 |
| 271 | MCARDLE | Crawford County, PA | Oil & Gas Property | Dec 2024 |
| 272 | MCAWLEY | Armstrong County, PA | Gas Property | Dec 2024 |
| 273 | MCBETH | Fayette County, PA | Gas Property | Dec 2024 |
| 274 | MCBETH | Fayette County, PA | Oil & Gas Property | Dec 2024 |
| 275 | MCBROOM 1 | Westmoreland County, PA | Gas Property | May 2025 |
| 276 | MCC PARTNERS | Washington County, PA | Oil & Gas Property | May 2025 |
| 277 | MCCABE | Bradford County, PA | Gas Property | May 2025 |
| 278 | MCCALL UNIT | Butler County, PA | Oil & Gas Property | May 2025 |
| 279 | MCCALMONT | Butler County, PA | Oil & Gas Property | Dec 2016 |
| 280 | MCCALMONT | Venango County, PA | Oil Property | Dec 2015 |
| 281 | MCCARTHY UNIT MCCARTHY 1H | Wyoming County, PA | Gas Property | May 2025 |
| 282 | MCCARTHY UNIT P&G WAREHOUSE 1 MCCARTHY | Wyoming County, PA | Gas Property | May 2025 |
| 283 | MCCARTNEY | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 284 | MCCARTY | Sullivan County, PA | Gas Property | May 2025 |
| 285 | MCCAULEY M | McKean County, PA | Oil & Gas Property | Dec 2024 |
| 286 | MCCAY M-598 | Clearfield County, PA | Gas Property | Dec 2024 |
| 287 | MCCHESNEY | Warren County, PA | Oil & Gas Property | Dec 2024 |
| 288 | MCCLAIN | Fayette County, PA | Oil & Gas Property | Dec 2024 |
| 289 | MCCLAIN 8 | Indiana County, PA | Oil & Gas Property | Dec 2024 |
| 290 | MCCLAY J | Washington County, PA | Oil Property | Dec 1993 |
| 291 | MCCLEARY | Jefferson County, PA | Gas Property | Dec 2024 |
| 292 | MCCLIMANS | Mercer County, PA | Oil & Gas Property | Dec 2024 |
| 293 | MCCLOSKEY L | Mercer County, PA | Gas Property | Dec 2024 |
| 294 | MCCLURE | Greene County, PA | Gas Property | Dec 2024 |
| 295 | MCCLURE HEIRS | Greene County, PA | Gas Property | Dec 2024 |
| 296 | MCCLURE M | Jefferson County, PA | Gas Property | Dec 2024 |
| 297 | MCCONNAUGHEY | Indiana County, PA | Gas Property | Dec 2024 |
| 298 | MCCONNELL | Indiana County, PA | Gas Property | Dec 2024 |
| 299 | MCCONNELL | Bradford County, PA | Gas Property | May 2025 |
| 300 | MCCOOL | Warren County, PA | Oil & Gas Property | Dec 2001 |