| 201 | Cougar Energy Inc | Oil City, PA 16301-4046 | Oil & Gas Operator | Dec 2013 |
| 202 | Crowley Oil Co LLC | Turtlepoint, PA 16750-1620 | Oil & Gas Operator | Dec 2024 |
| 203 | Curtis & Son Oil Inc | Sugar Grove, PA 16350 | Oil & Gas Operator | Dec 2025 |
| 204 | Curtis Oil Inc | Duke Center, PA 16729-0287 | Oil & Gas Operator | Dec 2025 |
| 205 | D & B Gas Prod LLC | Kittanning, PA 16201-7123 | Oil & Gas Operator | Dec 2025 |
| 206 | D & L Energy Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 2016 |
| 207 | D & S Energy Corp | Tiona, PA 16352-0102 | Oil & Gas Operator | Dec 2018 |
| 208 | D & S Gas | Rural Valley, PA 16249-4408 | Gas Operator | Dec 2000 |
| 209 | D N Stover Inc | Knox, PA 16232-0810 | Oil & Gas Operator | Dec 2015 |
| 210 | D R & D Co | Warren, PA 16365-2302 | Oil Operator | Dec 2025 |
| 211 | Dakota Oil & Gas Co | Delmont, PA 15626-2408 | Oil & Gas Operator | Dec 2025 |
| 212 | Dakota Opr Co Inc | Indiana, PA 15701-0444 | Oil & Gas Operator | Dec 1999 |
| 213 | Dale F & Dale R Fox | Centerville, PA 16404-9801 | Gas Operator | Dec 1999 |
| 214 | Dale R & George W Magee | Duke Center, PA 16729-0217 | Oil & Gas Operator | Dec 2010 |
| 215 | Dale U & Martha E Livermore | Brookville, PA 15825-7524 | Gas Operator | Dec 2024 |
| 216 | Dallas Energy LLC | Bradford, PA 16701 | Oil & Gas Operator | Dec 2025 |
| 217 | Daniel P Hornburg | Clarendon, PA 16313-2324 | Oil & Gas Operator | Dec 2025 |
| 218 | Dannic Energy Corp | Indiana, PA 15701-1532 | Oil & Gas Operator | Dec 2025 |
| 219 | Dave Shrader Oil FLD SVC Inc | Endeavor, PA 16322-0189 | Oil & Gas Operator | Dec 2025 |
| 220 | David E & Edna P Keller | Sugar Grove, PA 16350-5930 | Oil & Gas Operator | Dec 2009 |
| 221 | David L Hill | Bradford, PA 16701-0309 | Oil & Gas Operator | Dec 2025 |
| 222 | David Lesher Dba Lesher Oil | Reno, PA 16343-0293 | Oil Operator | Dec 2006 |
| 223 | Davidson Roger D | Clarendon, PA 16313-4532 | Oil & Gas Operator | Dec 2025 |
| 224 | Dawn Energy SVC | Templeton, PA 16259-3616 | Gas Operator | Dec 2025 |
| 225 | De LTD Family Partnership | Punxsutawney, PA 15767-2646 | Oil & Gas Operator | Dec 2022 |
| 226 | Deborah A & Gregory J Moyer | Lewis Run, PA 16738 | Oil & Gas Operator | Dec 2025 |
| 227 | Deer Creek Oil & Gas | Atlanta, GA 30326-1000 | Gas Operator | Dec 1987 |
| 228 | Deer Run Oil & Gas LLC | Albion, PA 16401-8306 | Gas Operator | Dec 2024 |
| 229 | Deitz Edith | Clarion, PA 16214-9416 | Oil & Gas Operator | Dec 2009 |
| 230 | Deitz Gas & Oil Inc | Clarion, PA 16214-3215 | Oil & Gas Operator | Dec 2024 |
| 231 | Delta Petro Corp Of Colorado | Houston, TX 77010-3089 | Gas Operator | Dec 2003 |
| 232 | Destiny Inc | Sprankle Mills, PA 15776-9705 | Gas Operator | Dec 2009 |
| 233 | Developed Resources Inc | Cheswick, PA 15024-1351 | Oil & Gas Operator | Dec 2025 |
| 234 | Devonian Resources Inc | Pikeville, KY 41502 | Oil & Gas Operator | Dec 2024 |
| 235 | DH Production | Albany, TX 76430 | Oil Operator | Dec 2005 |
| 236 | Diamond Energy Partners LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2025 |
| 237 | Discovery Oil & Gas LLC | Canonsburg, PA 15317-9557 | Gas Operator | Dec 2025 |
| 238 | Diversified Oil & Gas LLC | Jackson Center, PA 16133 | Oil & Gas Operator | Dec 2025 |
| 239 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Feb 2026 |
| 240 | DJR Well Services Inc | McDonald, OH 44437 | Oil & Gas Operator | Dec 2025 |
| 241 | DJW Enterprises Inc | Buckhannon, WV 26201-9126 | Gas Operator | Dec 2025 |
| 242 | DK Gas Inc | Hawthorn, PA 16230-0228 | Oil & Gas Operator | Dec 2006 |
| 243 | DL Resources Inc | Ludlow, PA 16333-0039 | Oil & Gas Operator | Dec 2025 |
| 244 | Donald E & Janet L Rearick | Ford City, PA 16226-9801 | Gas Operator | Dec 2025 |
| 245 | Dorso Energy | Wexford, PA 15090 | Oil & Gas Operator | Dec 2004 |
| 246 | Dorso LLC | Wexford, PA 15090-8758 | Oil & Gas Operator | Dec 2005 |
| 247 | Dorso LP | Wexford, PA 15090-8314 | Oil & Gas Operator | Dec 2024 |
| 248 | Dorward Energy Corporation | Saint Petersburg, FL 33701-3255 | Oil & Gas Operator | Dec 2024 |
| 249 | Double Aa S LLC | Mayport, PA 16240-5638 | Oil & Gas Operator | Dec 2019 |
| 250 | Double J Resources Inc | Bradford, PA 16701-6506 | Oil & Gas Operator | Dec 2022 |
| 251 | Douglas Bieda Dba Lonestar Farms | Clarksburg, PA 15725-8525 | Gas Operator | Dec 2025 |
| 252 | Douglas Oil & Gas Inc | Canonsburg, PA 15317 | Gas Operator | Dec 2003 |
| 253 | Douglas Oil & Gas LP | State College, PA 16803 | Oil & Gas Operator | Dec 2007 |
| 254 | Drake Denver | Shinglehouse, PA 16748-5517 | Oil & Gas Operator | Dec 2025 |
| 255 | Duhring Resource Co | Sheffield, PA 16347-2642 | Oil & Gas Operator | Dec 2012 |
| 256 | Dunn Joseph L | Washington, PA 15301-6404 | Oil & Gas Operator | Dec 2025 |
| 257 | Dvy Energy LLC | Hadley, PA 16130-2320 | Oil & Gas Operator | Dec 2025 |
| 258 | Eagle Line Corp | Pleasantville, PA 16341-1705 | Oil Operator | Dec 2015 |
| 259 | Eagle Resources Corp | Cranberry TWP, PA 16066-0791 | Oil & Gas Operator | Dec 2012 |
| 260 | East Resources MGMT LLC | Warrendale, PA 15086-7528 | Oil & Gas Operator | Dec 2010 |
| 261 | East Resources, Inc. | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2021 |
| 262 | Eastern Gas Trans & Storage Inc | Bridgeport, WV 26330-6919 | Oil & Gas Operator | Dec 2025 |
| 263 | Ebara Elliott Energy | Jeannette, PA 15644-1474 | Gas Operator | Dec 2022 |
| 264 | Ebtb Corp | Morgantown, WV 26504 | Oil & Gas Operator | Dec 2016 |
| 265 | Ecm Exploration Inc | Punxsutawney, PA 15767-6601 | Gas Operator | Dec 2025 |
| 266 | Edisto Resources Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 267 | Ej Brumage & Ra Pultorak | Waynesburg, PA 15370-2434 | Gas Operator | Dec 2018 |
| 268 | Ejb Trading Co LLC | Pittsburgh, PA 15228 | Gas Operator | Dec 2024 |
| 269 | Elder Oil & Gas Co | Parker, PA 16049-6426 | Oil & Gas Operator | Dec 2025 |
| 270 | Elec Materials Co | North East, PA 16428-1539 | Gas Operator | Dec 1994 |
| 271 | Em Energy Pa LLC | Canonsburg, PA 15317-5860 | Oil & Gas Operator | Jun 2020 |
| 272 | Emax Oil Company | Charlottesville, VA 22903-4973 | Oil & Gas Operator | Dec 2016 |
| 273 | Empire Exploration Inc | Wichita, KS 67202 | Oil & Gas Operator | Jul 1997 |
| 274 | Endeavour Operating Corp | Denver, CO 80202-2000 | Gas Operator | Jun 2014 |
| 275 | Energy Corp Of Amer | Charleston, WV 25311-1264 | Oil & Gas Operator | Mar 2018 |
| 276 | Energy Exploration & Dev LTD | Cortland, OH 44410-9454 | Oil & Gas Operator | Dec 2014 |
| 277 | Energy Prod Co | Pittsburgh, PA 15241-3949 | Gas Operator | Dec 1994 |
| 278 | Energy Resources Of Amer Inc | Columbiana, OH 44408 | Oil & Gas Operator | Dec 2021 |
| 279 | Enervest Opr LLC | Charleston, WV 25301-1782 | Oil & Gas Operator | Dec 2019 |
| 280 | Envirogas Inc | Hamburg, NY 14075 | Oil & Gas Operator | Dec 1992 |
| 281 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 282 | Eqt Aro LLC | Canonsburg, PA 15317-5851 | Gas Operator | Dec 2025 |
| 283 | Eqt Chap, LLC | Canonsburg, PA 15317-1000 | Oil & Gas Operator | Dec 2025 |
| 284 | Eqt Production Company | Pittsburg, PA 15222 | Oil & Gas Operator | Dec 2025 |
| 285 | Equitable Gas Company | Pittsburgh, PA 15212-5352 | Gas Operator | Dec 2013 |
| 286 | Equitable Prod Eastern States Exploration Inc | Snow Shoe, PA 16874-0178 | Gas Operator | Dec 2001 |
| 287 | Equitable Resources Energy Co | Big Stone Gap, VA 24219 | Gas Operator | Dec 1995 |
| 288 | Equitrans Inc | Cannonsburg, PA 15317 | Oil & Gas Operator | Dec 2018 |
| 289 | Equitrans, L. P. | Cannonsburg, PA 15317 | Oil & Gas Operator | Jul 2021 |
| 290 | Equity Oil & Gas Funds Inc | Orlando, FL 32837-6103 | Oil & Gas Operator | Dec 2025 |
| 291 | Eralco Natural Gas Dev LTD | Albion, PA 16401-9801 | Gas Operator | Dec 1985 |
| 292 | Erebor Resources LLC | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 293 | Erie City Erie Cnty | Erie, PA 16501-1149 | Gas Operator | Dec 1999 |
| 294 | Erie City SCH Dist | Erie, PA 16502-2834 | Gas Operator | Dec 2018 |
| 295 | Erie Hard Chrome Inc | Erie, PA 16511-1750 | Gas Operator | Dec 2014 |
| 296 | Erie Yacht Club | Erie, PA 16512-0648 | Gas Operator | Dec 2025 |
| 297 | Ernestine & W Eugene Mitchell | Waterford, PA 16441-9801 | Gas Operator | Dec 1985 |
| 298 | Ess Exploration And Production Company LLC | Apollo, PA 15613 | Gas Operator | Dec 2025 |
| 299 | Etter Road Investments LLC | Erie, PA 16505-1352 | Gas Operator | Dec 2025 |
| 300 | Everflow Eastern Inc | Canfield, OH 44406-0629 | Oil & Gas Operator | Dec 2025 |