| 1 | D & B Gas Prod LLC | Kittanning, PA 16201-7123 | Oil & Gas Operator | Dec 2023 |
| 2 | D & L Energy Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 2016 |
| 3 | D & S Energy Corp | Tiona, PA 16352-0102 | Oil & Gas Operator | Dec 2018 |
| 4 | D N Stover Inc | Knox, PA 16232-0810 | Oil & Gas Operator | Dec 2015 |
| 5 | Dakota Oil & Gas Co | Delmont, PA 15626-2408 | Oil & Gas Operator | Dec 2023 |
| 6 | Dakota Opr Co Inc | Indiana, PA 15701-0444 | Oil & Gas Operator | Dec 1999 |
| 7 | Dale R & George W Magee | Duke Center, PA 16729-0217 | Oil & Gas Operator | Dec 2010 |
| 8 | Dallas Energy LLC | Bradford, PA 16701 | Oil & Gas Operator | Dec 2023 |
| 9 | Daniel P Hornburg | Clarendon, PA 16313-2324 | Oil & Gas Operator | Dec 2023 |
| 10 | Dannic Energy Corp | Indiana, PA 15701-1532 | Oil & Gas Operator | Dec 2023 |
| 11 | Dave Shrader Oil FLD SVC Inc | Endeavor, PA 16322-0189 | Oil & Gas Operator | Dec 2023 |
| 12 | David L Hill | Bradford, PA 16701-0309 | Oil & Gas Operator | Dec 2023 |
| 13 | David Lesher Dba Lesher Oil | Reno, PA 16343-0293 | Oil Operator | Dec 2006 |
| 14 | Davidson Roger D | Clarendon, PA 16313-4532 | Oil & Gas Operator | Dec 2023 |
| 15 | Dawn Energy SVC | Templeton, PA 16259-3616 | Gas Operator | Dec 2023 |
| 16 | De LTD Family Partnership | Punxsutawney, PA 15767-2646 | Oil & Gas Operator | Dec 2022 |
| 17 | Deitz Edith | Clarion, PA 16214-9416 | Oil & Gas Operator | Dec 2009 |
| 18 | Deitz Gas & Oil Inc | Clarion, PA 16214-3215 | Oil & Gas Operator | Dec 2023 |
| 19 | Delta Petro Corp Of Colorado | Houston, TX 77010-3089 | Gas Operator | Dec 2003 |
| 20 | Developed Resources Inc | Cheswick, PA 15024 | Oil & Gas Operator | Dec 2022 |
| 21 | Devonian Resources Inc | Pikeville, KY 41502 | Oil & Gas Operator | Dec 2022 |
| 22 | DH Production | Albany, TX 76430 | Oil Operator | Dec 2005 |
| 23 | Diamond Energy Partners LLC | Vienna, OH 44473 | Oil & Gas Operator | Dec 2023 |
| 24 | Diversified Oil & Gas LLC | Jackson Center, PA 16133 | Oil & Gas Operator | Dec 2022 |
| 25 | Diversified Production LLC | Minden, LA 71055 | Oil & Gas Operator | Apr 2024 |
| 26 | DJR Well Services Inc | McDonald, OH 44437 | Oil & Gas Operator | Dec 2023 |
| 27 | DK Gas Inc | Hawthorn, PA 16230-0228 | Oil & Gas Operator | Dec 2006 |
| 28 | DL Resources Inc | Ludlow, PA 16333-0039 | Oil & Gas Operator | Jan 2024 |
| 29 | Dorso Energy | Wexford, PA 15090 | Oil & Gas Operator | Dec 2004 |
| 30 | Dorso LLC | Wexford, PA 15090-8758 | Oil & Gas Operator | Dec 2005 |
| 31 | Dorso LP | Wexford, PA 15090-8314 | Oil & Gas Operator | Dec 2022 |
| 32 | Dorward Energy Corporation | Saint Petersburg, FL 33701-3255 | Oil & Gas Operator | Dec 2021 |
| 33 | Double Aa S LLC | Mayport, PA 16240-5638 | Oil & Gas Operator | Dec 2019 |
| 34 | Double J Resources Inc | Bradford, PA 16701-6506 | Oil & Gas Operator | Dec 2022 |
| 35 | Douglas Oil & Gas Inc | Canonsburg, PA 15317 | Gas Operator | Dec 2003 |
| 36 | Douglas Oil & Gas LP | State College, PA 16803 | Oil & Gas Operator | Dec 2007 |
| 37 | Duhring Resource Co | Sheffield, PA 16347-2642 | Oil & Gas Operator | Dec 2012 |
| 38 | Dunn Joseph L | Washington, PA 15301-6404 | Oil & Gas Operator | Dec 2021 |
| 39 | Dvy Energy LLC | Hadley, PA 16130-2320 | Gas Operator | Dec 2023 |