| 201 | Dawn Energy SVC | Templeton, PA 16259-3616 | Gas Operator | Dec 2024 |
| 202 | De LTD Family Partnership | Punxsutawney, PA 15767-2646 | Oil & Gas Operator | Dec 2022 |
| 203 | Deer Creek Oil & Gas | Atlanta, GA 30326-1000 | Gas Operator | Dec 1987 |
| 204 | Deer Run Oil & Gas LLC | Albion, PA 16401-8306 | Gas Operator | Dec 2024 |
| 205 | Deitz Edith | Clarion, PA 16214-9416 | Oil & Gas Operator | Dec 2009 |
| 206 | Deitz Gas & Oil Inc | Clarion, PA 16214-3215 | Oil & Gas Operator | Dec 2024 |
| 207 | Delta Petro Corp Of Colorado | Houston, TX 77010-3089 | Gas Operator | Dec 2003 |
| 208 | Developed Resources Inc | Cheswick, PA 15024 | Oil & Gas Operator | Dec 2024 |
| 209 | Devonian Resources Inc | Pikeville, KY 41502 | Oil & Gas Operator | Dec 2024 |
| 210 | DH Production | Albany, TX 76430 | Oil Operator | Dec 2005 |
| 211 | Diamond Energy Partners LLC | Collinsville, OK 74021 | Oil & Gas Operator | Feb 2025 |
| 212 | Discovery Oil & Gas LLC | Canonsburg, PA 15317-9557 | Gas Operator | Dec 2024 |
| 213 | Diversified Oil & Gas LLC | Jackson Center, PA 16133 | Oil & Gas Operator | Mar 2025 |
| 214 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 215 | DJR Well Services Inc | McDonald, OH 44437 | Oil & Gas Operator | Dec 2024 |
| 216 | DK Gas Inc | Hawthorn, PA 16230-0228 | Oil & Gas Operator | Dec 2006 |
| 217 | DL Resources Inc | Ludlow, PA 16333-0039 | Oil & Gas Operator | Dec 2024 |
| 218 | Donald E & Janet L Rearick | Ford City, PA 16226-9801 | Gas Operator | Dec 2024 |
| 219 | Dorso Energy | Wexford, PA 15090 | Oil & Gas Operator | Dec 2004 |
| 220 | Dorso LLC | Wexford, PA 15090-8758 | Oil & Gas Operator | Dec 2005 |
| 221 | Dorso LP | Wexford, PA 15090-8314 | Oil & Gas Operator | Dec 2024 |
| 222 | Dorward Energy Corporation | Saint Petersburg, FL 33701-3255 | Oil & Gas Operator | Dec 2024 |
| 223 | Double Aa S LLC | Mayport, PA 16240-5638 | Oil & Gas Operator | Dec 2019 |
| 224 | Double J Resources Inc | Bradford, PA 16701-6506 | Oil & Gas Operator | Dec 2022 |
| 225 | Douglas Oil & Gas Inc | Canonsburg, PA 15317 | Gas Operator | Dec 2003 |
| 226 | Douglas Oil & Gas LP | State College, PA 16803 | Oil & Gas Operator | Dec 2007 |
| 227 | Drake Denver | Shinglehouse, PA 16748-5517 | Oil & Gas Operator | Dec 2024 |
| 228 | Duhring Resource Co | Sheffield, PA 16347-2642 | Oil & Gas Operator | Dec 2012 |
| 229 | Dunn Joseph L | Washington, PA 15301-6404 | Oil & Gas Operator | Dec 2024 |
| 230 | Dvy Energy LLC | Hadley, PA 16130-2320 | Gas Operator | Dec 2024 |
| 231 | Eagle Line Corp | Pleasantville, PA 16341-1705 | Oil Operator | Dec 2015 |
| 232 | Eagle Resources Corp | Cranberry TWP, PA 16066-0791 | Oil & Gas Operator | Dec 2012 |
| 233 | East Resources MGMT LLC | Warrendale, PA 15086-7528 | Oil & Gas Operator | Dec 2010 |
| 234 | East Resources, Inc. | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2021 |
| 235 | Eastern Gas Trans & Storage Inc | Bridgeport, WV 26330-6919 | Oil & Gas Operator | Feb 2025 |
| 236 | Ecm Exploration Inc | Punxsutawney, PA 15767-6601 | Gas Operator | Dec 2024 |
| 237 | Edisto Resources Corp | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 238 | Ej Brumage & Ra Pultorak | Waynesburg, PA 15370-2434 | Gas Operator | Dec 2018 |
| 239 | Elder Oil & Gas Co | Parker, PA 16049-6426 | Oil & Gas Operator | Dec 2024 |
| 240 | Elec Materials Co | North East, PA 16428-1539 | Gas Operator | Dec 1994 |
| 241 | Elliott Co Inc | Jeannette, PA 15644-1474 | Gas Operator | Dec 2022 |
| 242 | Em Energy Pa LLC | Canonsburg, PA 15317-5860 | Oil & Gas Operator | Jun 2020 |
| 243 | Emax Oil Company | Charlottesville, VA 22903-4973 | Oil & Gas Operator | Dec 2016 |
| 244 | Empire Energy E & P LLC | Mayville, NY 14757 | Oil & Gas Operator | Dec 2024 |
| 245 | Empire Exploration Inc | Wichita, KS 67202 | Oil & Gas Operator | Jul 1997 |
| 246 | Endeavour Operating Corp | Denver, CO 80202-2000 | Oil & Gas Operator | Sep 2015 |
| 247 | Energy Corp Of Amer | Charleston, WV 25311-1264 | Oil & Gas Operator | Mar 2018 |
| 248 | Energy Production Co | Pittsburgh, PA 15241-3949 | Oil & Gas Operator | Dec 1994 |
| 249 | Energy Resources Of Amer Inc | Columbiana, OH 44408 | Oil & Gas Operator | Dec 2021 |
| 250 | Enervest Opr LLC | Charleston, WV 25301-1782 | Oil & Gas Operator | Dec 2019 |
| 251 | Envirogas Inc | Hamburg, NY 14075 | Oil & Gas Operator | Dec 1992 |
| 252 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 253 | Eqt Aro LLC | Canonsburg, PA 15317-5851 | Gas Operator | Mar 2025 |
| 254 | Eqt Chap, LLC | Pittsburgh, PA 15222 | Oil & Gas Operator | Mar 2025 |
| 255 | Eqt Production Company | Pittsburg, PA 15222 | Oil & Gas Operator | Mar 2025 |
| 256 | Equitable Gas Company | Pittsburgh, PA 15212-5352 | Gas Operator | Dec 2013 |
| 257 | Equitable Prod Eastern States Exploration Inc | Snow Shoe, PA 16874-0178 | Gas Operator | Dec 2001 |
| 258 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 259 | Equitrans Inc | Cannonsburg, PA 15317 | Oil & Gas Operator | Dec 2018 |
| 260 | Equitrans, L. P. | Cannonsburg, PA 15317 | Oil & Gas Operator | Jul 2021 |
| 261 | Equity Oil & Gas Funds Inc | Orlando, FL 32837-6103-6103 | Oil & Gas Operator | Dec 2024 |
| 262 | Erie City Erie Cnty | Erie, PA 16501-1149 | Gas Operator | Dec 1999 |
| 263 | Erie City SCH Dist | Erie, PA 16502-2834 | Gas Operator | Dec 2018 |
| 264 | Erie Hard Chrome Inc | Erie, PA 16511-1750 | Gas Operator | Dec 2014 |
| 265 | Erie Yacht Club | Erie, PA 16512-0648 | Gas Operator | Dec 2019 |
| 266 | Etter Road Investments LLC | Erie, PA 16505-1352 | Gas Operator | Dec 2024 |
| 267 | Everflow Eastern Inc | Canfield, OH 44406-0629 | Oil & Gas Operator | Dec 2024 |
| 268 | Evergreen Resource Co | Warren, PA 16365-4321 | Oil & Gas Operator | Dec 2024 |
| 269 | Exco Resources (Pa), LLC | Dallas, TX 75251-2224 | Oil & Gas Operator | Mar 2025 |
| 270 | Exco Resources Pa Inc | Warrendale, PA 15086-6501 | Oil & Gas Operator | Dec 2011 |
| 271 | Exley Oil & Gas Corp | Lemont, PA 16851-0425 | Oil & Gas Operator | Dec 2019 |
| 272 | Exotic Oil & Gas LLC | Indiana, PA 15701-3634 | Oil & Gas Operator | Dec 2024 |
| 273 | Exploration Energy Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2009 |
| 274 | F & S Oil | | Oil Operator | Dec 2021 |
| 275 | Fairman Corp | Du Bois, PA 15801-0288 | Oil & Gas Operator | Dec 2024 |
| 276 | Fairman Drilling Co | Du Bois, PA 15801-0288 | Oil & Gas Operator | Dec 2002 |
| 277 | Fairman Oil & Gas Co Inc | Oil City, PA 16301 | Oil & Gas Operator | Dec 1991 |
| 278 | Farabaugh Arthur R & John A | Loretto, PA 15940-8001 | Gas Operator | Dec 2015 |
| 279 | Farrington & Hepler Gas & Oil Inc | Seneca, PA 16346-0546 | Oil & Gas Operator | Dec 2024 |
| 280 | Fawnwood Energy Inc | Bruin, PA 16022-0157 | Oil & Gas Operator | Dec 2019 |
| 281 | Feikls Oil & Gas Inc | Eagle, ID 83616-7713 | Oil & Gas Operator | Dec 2024 |
| 282 | Felmont Oil Corporation | Walnut Creek, CA 94596-3568 | Oil & Gas Operator | Feb 1990 |
| 283 | Fetterman Samuel C SR | Rossiter, PA 15772 | Gas Operator | Dec 2022 |
| 284 | First Alliance CH | Erie, PA 16506-5024 | Gas Operator | Dec 2017 |
| 285 | First Amer Energy Inc | Bradford, PA 16701-0184 | Oil & Gas Operator | Dec 2024 |
| 286 | Flanigan Bros | Edinboro, PA 16412-1443 | Oil & Gas Operator | Dec 2024 |
| 287 | Flatirons Development LLC | Westminster, CO 80020-2771 | Gas Operator | Dec 2015 |
| 288 | Foree Oil Company | Terrell, TX 75160 | Oil & Gas Operator | May 2025 |
| 289 | Fork Run Oil & Gas LLC | Sheffield, PA 16347-0012 | Oil & Gas Operator | Dec 2024 |
| 290 | Forrest Richard E | New Bethlehem, PA 16242-2547 | Gas Operator | Dec 2019 |
| 291 | Fortress Energy Corp | Pittsburgh, PA 15217-4207 | Oil & Gas Operator | Dec 2023 |
| 292 | Frank L Washabaugh Oil Producers | Imperial, PA 15126-1050 | Oil & Gas Operator | Dec 2010 |
| 293 | Frederick Don C | Tylersburg, PA 16361-0066 | Gas Operator | Dec 1985 |
| 294 | Frederick Drilling Co & Sons Inc | Tylersburg, PA 16361-0066 | Oil & Gas Operator | Dec 2017 |
| 295 | Frontier Natural Resources | Bellefonte, PA 16823 | Gas Operator | Mar 2025 |
| 296 | G & G Gas Inc | New Bethlehem, PA 16242-4118 | Oil & Gas Operator | Dec 2024 |
| 297 | Galati Enterprises Inc | Jamestown, NY 14701-9358 | Oil & Gas Operator | Dec 2018 |
| 298 | Gallatin Fuels, Inc. | Uniontown, PA 15401-5513 | Oil & Gas Operator | Dec 2020 |
| 299 | Gas & Oil Co | Apollo, PA 15613-1108 | Oil & Gas Operator | Dec 2007 |
| 300 | Gas & Oil MGMT Assn Inc | Youngsville, PA 16371-1602 | Oil & Gas Operator | Dec 2024 |