| 1 | A & S Prod Inc | | Oil & Gas Operator | Dec 2025 |
| 2 | Ab Resources Pa LLC | Brecksville, OH 44141-3296 | Oil & Gas Operator | Dec 2011 |
| 3 | Abarta Oil & Gas Co., Inc. | Pittsburgh, PA 15238 | Oil & Gas Operator | Dec 2020 |
| 4 | Abbott Donald Jay | Edinboro, PA 16412-4129 | Gas Operator | Dec 2018 |
| 5 | Actagon Corp | | Oil & Gas Operator | Dec 2025 |
| 6 | Add Energy Co | Butler, PA 16002-0471 | Gas Operator | Dec 2020 |
| 7 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 8 | Advanced Petro Corp | | Oil & Gas Operator | Dec 1992 |
| 9 | Afco Energy Prod Co | Indiana, PA 15701-0538 | Oil & Gas Operator | Dec 2019 |
| 10 | Aiello Bros Oil & Gas Inc | Bradford, PA 16701-2925 | Oil & Gas Operator | Dec 2025 |
| 11 | Airdale Oil & Gas LLC | Oil City, PA 16301-3771 | Oil & Gas Operator | Dec 2025 |
| 12 | Alco Ind | | Gas Operator | Dec 2024 |
| 13 | Alcove Investments | Apollo, PA 15613-9720 | Oil & Gas Operator | Dec 2025 |
| 14 | Alice & Andrew & George Hazer | Girard, PA 16417-9801 | Gas Operator | Dec 2025 |
| 15 | Allegheny Enterprises Inc | Corsica, PA 15829-3833 | Oil & Gas Operator | Dec 2018 |
| 16 | Allegheny Natural Resources Inc | Gibsonia, PA 15044-8055 | Gas Operator | Dec 2019 |
| 17 | Allen Energy LLC | Cochranton, PA 16314-6214 | Oil & Gas Operator | Dec 2025 |
| 18 | Alliance Petroleum Corp | Canton, OH 44718-2553 | Oil & Gas Operator | Apr 2026 |
| 19 | Allshouse Terrence L Jr | Grand Valley, PA 16420-1930 | Oil & Gas Operator | Dec 2025 |
| 20 | Alma Gas Co Inc | Alma, NY 14708 | Oil & Gas Operator | Dec 2025 |
| 21 | Alpha Shale Res LP | Canonsburg, PA 15317-9554 | Gas Operator | Aug 2017 |
| 22 | Amer Exploration Co | Plymouth Meeting, PA 19462-1640 | Oil & Gas Operator | Dec 2008 |
| 23 | Amer Natural Resources LLC | Rural Valley, PA 16249-0306 | Oil & Gas Operator | Dec 2018 |
| 24 | Amer Oil & Gas LLC | MT Morris, PA 15349 | Oil & Gas Operator | Apr 2026 |
| 25 | Ams Energy LLC | Herman, PA 16039-0156 | Oil & Gas Operator | Apr 2026 |
| 26 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Jul 2026 |
| 27 | Ancient Sands Inc | Kittanning, PA 16201-0916 | Oil & Gas Operator | Dec 2025 |
| 28 | Anderson Energy SVC LLC | Clarendon, PA 16313-4238 | Oil & Gas Operator | Dec 2025 |
| 29 | Anegada Energy LLC | Canonsburg, PA 15317-0400 | Gas Operator | Apr 2026 |
| 30 | Angerman Assoc Inc | Pittsburgh, PA 15238-1359 | Oil & Gas Operator | Dec 1998 |
| 31 | Antero Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 32 | Apex Energy (Pa) LLC | Canonsburg, PA 15317-6523 | Gas Operator | May 2025 |
| 33 | Apex Resources Inc | Allison Park, PA 15101-3838 | Oil & Gas Operator | Dec 1993 |
| 34 | Apollo Gas Co | Pittsburgh, PA 15236-1435 | Gas Operator | Dec 1991 |
| 35 | Apollo Resources LLC | | Oil & Gas Operator | Apr 2026 |
| 36 | Appalachian Energy Inc | Pittsburgh, PA 15220 | Gas Operator | Dec 2008 |
| 37 | Appalachian Exploration Corp | McMurray, PA 15317-3452 | Gas Operator | Dec 1995 |
| 38 | Ardale Natural Gas LLC | Ford City, PA 16226-7003 | Gas Operator | Dec 2023 |
| 39 | Ardent Resources, Inc. | Upper St Clair, PA 15241-1633 | Oil & Gas Operator | Dec 2018 |
| 40 | Arg Resources Inc | Kane, PA 16735-6405 | Oil & Gas Operator | Dec 2019 |
| 41 | Ark Resources Inc | Indiana, PA 15701-0069 | Oil & Gas Operator | Dec 2014 |
| 42 | Armac Resources | Washington, PA 15301-0558 | Oil & Gas Operator | Dec 2011 |
| 43 | Armac Resources LLC | Washington, PA 15301-0558 | Oil & Gas Operator | Dec 2025 |
| 44 | Armstrong Gas Co LLC | Kittanning, PA 16201-2269 | Oil & Gas Operator | Dec 2018 |
| 45 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |
| 46 | Arrowhead Gas Producers Inc | | Gas Operator | Dec 1992 |
| 47 | Ashtola Prod Co | Valley Forge, PA 19482-0858 | Gas Operator | Dec 1986 |
| 48 | Atlas Resources Inc | Coraopolis, PA 15108-0611 | Oil & Gas Operator | Dec 2007 |
| 49 | Atlas Resources LLC | Pittsburgh, PA 15275-1033 | Oil & Gas Operator | Jun 2018 |
| 50 | Atwood Energy Inc | Port Washington, OH 43837-9214 | Oil & Gas Operator | Dec 1993 |
| 51 | Autumn Ridge Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2025 |
| 52 | Aw Tipka Oil & Gas Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2025 |
| 53 | Azco Opr Co | Phoenix, AZ 85076-0535 | Oil & Gas Operator | Dec 2001 |