| 1 | Arlington Storage Company, LLC | Houston, TX 77002 | Gas Operator | Dec 2008 |
| 2 | Avoca Farms LTD | Avoca, NY 14809 | Gas Operator | Dec 2017 |
| 3 | Chesapeake Appalachia LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 2018 |
| 4 | Chris Glade Oil & Gas, LLC | Salt Lake City, UT 84107 | Gas Operator | Dec 2011 |
| 5 | CNX Gas Company LLC | Canonsburg, PA 15317-6506 | Oil & Gas Operator | Dec 2020 |
| 6 | Copper Ridge Oil Inc | Olean, NY 14760 | Oil & Gas Operator | Dec 2017 |
| 7 | East Resources, Inc. | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2017 |
| 8 | Eastern American Energy Corp | | Oil & Gas Operator | Dec 2008 |
| 9 | Fortuna Energy Inc. | | Gas Operator | Dec 2000 |
| 10 | GFS Energy, Inc. | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2017 |
| 11 | Megaenergy Operating, Inc. | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Jul 2015 |
| 12 | Nathan Petroleum Corp. | Whitesville, NY 14897 | Oil & Gas Operator | Dec 2017 |
| 13 | National Fuel Gas Supply Corp. | Williamsville, NY 14221 | Gas Operator | Dec 2010 |
| 14 | North Branch Energy LLC | | Oil & Gas Operator | Dec 2017 |
| 15 | Plants & Goodwin Inc | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2017 |
| 16 | PPP Future Development, Inc. | Alexander, NY 14005 | Oil & Gas Operator | Dec 2017 |
| 17 | Richardson Petroleum Corp. | Andover, NY 14806 | Oil & Gas Operator | Dec 2017 |
| 18 | Seneca Resources Corporation | Bakersfield, CA 93311-2487 | Oil & Gas Operator | Nov 2018 |
| 19 | SK Enterprises | Andover, NY 14806 | Oil Operator | Dec 2017 |
| 20 | Steuben Gas Storage Co. | | Gas Operator | Dec 2000 |
| 21 | Talisman Energy USA Inc. | The Woodlands, TX 77381 | Oil & Gas Operator | Dec 2017 |
| 22 | Universal Resources Holdings Inc | Dunkirk, NY 14048 | Oil & Gas Operator | Dec 2016 |
| 23 | Vandermark Exploration, Inc. | Buffalo, NY 14219 | Gas Operator | Dec 2011 |
| 24 | Vertical Energy, Inc. | Sugar Grove, PA 16350 | Oil & Gas Operator | Dec 2017 |
| 25 | West Branch Services, LLC | Indiana, PA 15701 | Gas Operator | Dec 2017 |
| 26 | Wyckoff Gas Storage Co., LLC | Tulsa, OK 74136 | Gas Operator | Dec 2006 |
| 27 | Yahn & Yahn Inc. | Hammondsport, NY 14840 | Oil & Gas Operator | Dec 2017 |