| 1 | Bay Oaks Resources LLC | Fort Smith, AR 72913-3129 | Gas Operator | Feb 2018 |
| 2 | Bowman & Cains Exploration, LLC | | Gas Operator | Sep 2020 |
| 3 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 4 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2024 |
| 5 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Aug 2024 |
| 6 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 7 | Cross Timbers Operating Inc | | Gas Operator | Jul 2001 |
| 8 | Crow Creek Operating Co II LLC | Houston, TX 77252 | Oil & Gas Operator | Nov 2011 |
| 9 | Eagle Rock Mid-Continent Operating LLC | Tulsa, OK 74103-3703 | Oil & Gas Operator | Sep 2024 |
| 10 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 11 | Faulconer Vernon E Inc | Tyler, TX 75711 | Oil & Gas Operator | Oct 2024 |
| 12 | Forest Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 13 | Foundation Energy Management, LLC | Addison, TX 75001 | Oil & Gas Operator | Dec 2024 |
| 14 | Freedom Energy Inc | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Dec 2024 |
| 15 | Hanna Oil And Gas Company | Fort Smith, AR 72901 | Oil & Gas Operator | Sep 2024 |
| 16 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 17 | Hogback Exploration Inc | Fort Smith, AR 72916 | Oil & Gas Operator | Oct 2024 |
| 18 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Jul 2024 |
| 19 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2024 |
| 20 | Klabzuba Oil & Gas Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 2012 |
| 21 | Lawco Exploration Inc | Bentonville, AR 72712 | Oil & Gas Operator | May 2024 |
| 22 | Lime Rock Resources III-A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2024 |
| 23 | Lyons & Lyons Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 24 | Max Extract Technologies, LLC | Oklahoma City, OK 73105 | Gas Operator | Jun 2024 |
| 25 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Aug 2024 |
| 26 | MMGK Arkoma, LLC | Dallas, TX 75240 | Gas Operator | Jun 2024 |
| 27 | Mueller, Thomas C Inc | | Gas Operator | Dec 2004 |
| 28 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 29 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2017 |
| 30 | Oxley Energy LLC | Houston, TX 77042 | Gas Operator | Oct 2024 |
| 31 | Oxley Petroleum Company | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 32 | Ozark Oil & Gas, Inc | | Gas Operator | May 2018 |
| 33 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 34 | Petroleum Development Company | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2024 |
| 35 | Prosper Oil & Gas,Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 36 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2024 |
| 37 | Riverfront Exploration LLC | Fort Smith, AR 72901 | Gas Operator | Oct 2024 |
| 38 | Rock Creek Energy, LLC | Fort Smith, AR 72901 | Gas Operator | Jun 2024 |
| 39 | Rush-Andrus Engineering | Royse City, TX 75189 | Oil & Gas Operator | Feb 2022 |
| 40 | Sagely Floyd E Properties LTD | Fort Smith, AR 72917-0308 | Gas Operator | Jan 2015 |
| 41 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2024 |
| 42 | Sandridge Exploration And Production LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Dec 2024 |
| 43 | Sedna Energy, Inc | | Gas Operator | Nov 2011 |
| 44 | Seeco | | Gas Operator | Jul 2016 |
| 45 | Seeco, Inc. | | Gas Operator | Sep 2015 |
| 46 | Shamrock Well Operations LLC | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Oct 2024 |
| 47 | Shields Operating Inc | Fort Smith, AR 72901-3834 | Oil & Gas Operator | Oct 2021 |
| 48 | Stephens Production Company | The Woodlands, TX 77381 | Oil & Gas Operator | Sep 2024 |
| 49 | The Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 50 | TK Drilling Corp. | Tulsa, OK 74133 | Oil & Gas Operator | Sep 2024 |
| 51 | Unit Petroleum Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
| 52 | Urban Oil & Gas Group, LLC | Plano, TX 75074 | Oil & Gas Operator | Dec 2024 |
| 53 | Vanguard Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2021 |
| 54 | Vastar Resources Inc | Houston, TX 77253 | Oil & Gas Operator | Aug 2024 |
| 55 | Weiser-Brown Operating Company | Magnolia, AR 71754 | Oil & Gas Operator | Dec 2024 |
| 56 | Wolf Exploration, Inc. | | Gas Operator | Oct 2012 |
| 57 | Xog Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 58 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |