| 101 | PDC Mountaineer LLC | Bridgeport, WV 26330-9665 | Oil & Gas Operator | Dec 2017 |
| 102 | Penn VIew Exploration Inc | Blairsville, PA 15717-7961 | Oil & Gas Operator | Dec 2024 |
| 103 | Penneco Oil Company, Inc. | Delmont, PA 15626-2408 | Oil & Gas Operator | Dec 2024 |
| 104 | Peoples Gas Co LLC | Butler, PA 16001-4904 | Oil & Gas Operator | Dec 2005 |
| 105 | Petro Dev Corp | Bridgeport, WV 26330-0026 | Oil & Gas Operator | Dec 2013 |
| 106 | Petro SVC Partners Inc | Indiana, PA 15701-8556 | Oil & Gas Operator | Dec 2024 |
| 107 | Petrobank Opr Co | Denver, CO 80202-4675 | Gas Operator | Dec 1992 |
| 108 | Phillips Exploration Inc | Warrendale, PA 15086 | Oil & Gas Operator | Dec 2012 |
| 109 | Phillips Prod Co | Warrendale, PA 15086-7537 | Oil & Gas Operator | Dec 2011 |
| 110 | Phoenix Energy Prod Inc | Freeport, PA 16229-1126 | Oil & Gas Operator | Dec 2024 |
| 111 | Pin Oak Energy Partners LLC | Akron, OH 44311 | Oil & Gas Operator | May 2025 |
| 112 | Power Gas MKT & Trans Inc | Akron, OH 44311-1062 | Oil & Gas Operator | Dec 2008 |
| 113 | PPG Oper LLC | State College, PA 16801-7569 | Gas Operator | May 2025 |
| 114 | Range Opr Co | Yatesboro, PA 16263-0235 | Oil & Gas Operator | Dec 1999 |
| 115 | Range Resources Appalachia LLC | Canonsburg, PA 15317 | Oil & Gas Operator | May 2025 |
| 116 | Roach & Assoc Inc | Pittsburgh, PA 15228-1924 | Gas Operator | Dec 2024 |
| 117 | Seneca Resources Co LLC | Cranberry Township, PA 16066 | Oil & Gas Operator | May 2025 |
| 118 | September Corp | Titusville, PA 16354-6833 | Oil & Gas Operator | Dec 2024 |
| 119 | Shawmut Production Corporation | Pittsburgh, PA 15219-1913 | Oil & Gas Operator | Jan 2003 |
| 120 | Shearer James I | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 121 | Shelly Oil & Gas Inc | Avonmore, PA 15618-9748 | Gas Operator | Dec 2024 |
| 122 | SK Opr Inc | Cabot, PA 16023-1250 | Gas Operator | Dec 2024 |
| 123 | Snyder Bros Inc | Kittanning, PA 16201 | Oil & Gas Operator | May 2025 |
| 124 | Snyder Oil Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2008 |
| 125 | Somerset Oil & Gas Company | Portland, TX 78374 | Oil & Gas Operator | Dec 2006 |
| 126 | Stewart Inc | Ringling, OK 73456 | Oil & Gas Operator | May 2025 |
| 127 | Stonehaven Energy MGT Co LLC | Clearfield, PA 16830-7342 | Oil & Gas Operator | Dec 2019 |
| 128 | Susquehanna Energies Inc | Punxsutawney, PA 15767-4004 | Oil & Gas Operator | Dec 2024 |
| 129 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2024 |
| 130 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 131 | Turm Oil Inc | Butler, PA 16002-0471 | Oil & Gas Operator | Dec 2024 |
| 132 | TW Phillips Gas Supply Corp | Butler, PA 16001-4904 | Oil & Gas Operator | Dec 2011 |
| 133 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | Mar 2025 |
| 134 | Vec Energy LLC | Kittanning, PA 16201-5022 | Oil & Gas Operator | May 2025 |
| 135 | Vernard L Shumaker | Apollo, PA 15613-0249 | Gas Operator | Dec 2024 |
| 136 | Victory Energy Corp | Indiana, PA 15701-8944 | Oil & Gas Operator | Dec 2021 |
| 137 | Viking Resources Corp | Deerfield, OH 44411-0160 | Oil & Gas Operator | Dec 2007 |
| 138 | Viking Resources LLC | Uniontown, OH 44685 | Oil & Gas Operator | Dec 2017 |
| 139 | WHC Oper LLC | Commodore, PA 15729-9109 | Gas Operator | Dec 2024 |
| 140 | William McIntire Coal Oil & Gas | Shelocta, PA 15774-0171 | Oil & Gas Operator | May 2022 |
| 141 | Wilmoth Interests, Inc. | Marion Center, PA 15759 | Oil & Gas Operator | Mar 2025 |
| 142 | Wind River Exploration Inc | Sewickley, PA 15143 | Oil & Gas Operator | Mar 2025 |
| 143 | Windfall Oil & Gas Inc | Falls Creek, PA 15840-2617 | Gas Operator | Dec 2024 |
| 144 | XPR Resources LLC | Canonsburg, PA 15317-5862 | Gas Operator | May 2025 |
| 145 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Jul 2025 |