| 1 | 9K Investments LLC | Cisco, TX 76437 | Oil & Gas Operator | May 2025 |
| 2 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 3 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 4 | Alaron Energy, Inc. | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 5 | Arp Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 6 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 7 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 8 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Feb 2025 |
| 9 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 10 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 11 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 12 | Bandera Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2017 |
| 13 | Basal Corporation | Cleburne, TX 76033 | Oil & Gas Operator | May 2025 |
| 14 | Beacon Energy Corporation (1) | Fredericksbrg, TX 78624 | Gas Operator | Sep 2002 |
| 15 | Bedrock Production, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 16 | Big State Industries, Inc. | Houston, TX 77010 | Oil & Gas Operator | Apr 2024 |
| 17 | BKV North Texas, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | May 2025 |
| 18 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | May 2025 |
| 19 | Blackwater Oil & Gas Corporation | Colleyville, TX 76034 | Oil & Gas Operator | May 2018 |
| 20 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 21 | Braka Operating, L.L.C. | Ranger, TX 76470 | Oil & Gas Operator | May 2025 |
| 22 | Brammer Supply Inc | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2014 |
| 23 | Brazos Operating LLC | Midland, TX 79710 | Gas Operator | May 2025 |
| 24 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2025 |
| 25 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 26 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 27 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 28 | Casco Energy, Inc. | Denison, TX 75020 | Oil & Gas Operator | May 1996 |
| 29 | Casteel, Hoyt F. | Graham, TX 76450 | Oil & Gas Operator | Nov 2001 |
| 30 | Certified Petroleum Inc. | Mineral Wells, TX 76067 | Oil & Gas Operator | May 2006 |
| 31 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 32 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 33 | Chief Oil & Gas LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2022 |
| 34 | Chief Operating LLC | Dallas, TX 75225 | Gas Operator | Mar 2009 |
| 35 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | May 2025 |
| 36 | Coastal Plains Energy Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2025 |
| 37 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 38 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | May 2025 |
| 39 | Cottonwood Petroleum Co. | Abilene, TX 79603 | Oil & Gas Operator | Jun 2009 |
| 40 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 41 | Dabb Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | Aug 2020 |
| 42 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 43 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 44 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2015 |
| 45 | Diamond S Energy Company | Fort Worth, TX 76132 | Oil & Gas Operator | May 2025 |
| 46 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 47 | Double Diamond Energy Corp. | Granbury, TX 76048 | Gas Operator | Apr 2013 |
| 48 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 49 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 50 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 51 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 52 | Empire Exploration Corp. 1989 | Lebanon, MO 65536 | Oil & Gas Operator | Mar 2003 |
| 53 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 54 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 55 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 56 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 57 | Evarado Oil Company | Strawn, TX 76475 | Oil & Gas Operator | May 2025 |
| 58 | Expanding Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2008 |
| 59 | Falcon Flight, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Apr 1995 |
| 60 | FDL Operating, LLC | Judson, TX 75660 | Oil & Gas Operator | May 2025 |
| 61 | Fossil Fuels Inc. | Dallas, TX 75201 | Oil & Gas Operator | May 2000 |
| 62 | G & F Oil, Inc. | Aledo, TX 76008 | Oil & Gas Operator | May 2025 |
| 63 | Gas Tap Corp. | Plano, TX 75075 | Gas Operator | May 2025 |
| 64 | Giant Energy Corp. | Dallas, TX 75230 | Oil & Gas Operator | Jul 2019 |
| 65 | Giant NRG Co., LP | Dallas, TX 75230 | Oil & Gas Operator | May 2025 |
| 66 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 67 | Hanks, Christopher Glenn | Gainesville, TX 76240 | Oil & Gas Operator | May 2025 |
| 68 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 69 | Hill Operating LLC | Mineral Wells, TX 76068 | Oil & Gas Operator | Nov 2023 |
| 70 | Hyer,Na & CJ Aldenhoven Trusts | Lipan, TX 76462 | Gas Operator | Oct 2017 |
| 71 | Initial Energy Services, LLC | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 72 | Jackson Petroleum Consulting,Inc | Plano, TX 75075 | Oil & Gas Operator | Sep 2019 |
| 73 | Javelin Energy Partners Management, LLC | Irving, TX 75038 | Oil & Gas Operator | May 2025 |
| 74 | Jericho Energy, Inc | Lipan, TX 76462 | Gas Operator | May 2025 |
| 75 | JJB Operating Co. | Mineral Wells, TX 76068 | Oil & Gas Operator | May 2025 |
| 76 | K & S Oil & Gas Company, LLC | Kerrville, TX 78028 | Oil & Gas Operator | May 2025 |
| 77 | Kasle Energy Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2017 |
| 78 | L.C.S. Production Company | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 79 | Legend Natural Gas IV, LP | Houston, TX 77094 | Oil & Gas Operator | Feb 2015 |
| 80 | Lincoln Energy Partners, LLC | South Dennis, MA 02660 | Oil Operator | May 2025 |
| 81 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 82 | Lynx Energy Company, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2008 |
| 83 | Lyon Energy, Inc. | Plano, TX 75075 | Oil & Gas Operator | Feb 2000 |
| 84 | Maddux Oil & Gas | Strawn, TX 76475 | Oil & Gas Operator | May 2025 |
| 85 | Marshall, Sam | Granbury, TX 76048 | Oil & Gas Operator | Aug 2010 |
| 86 | Marshall, Samuel Meek, Estate Of | Granbury, TX 76048 | Oil & Gas Operator | May 2025 |
| 87 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 88 | Meeker & Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 89 | Meeker, Dan Management, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 2007 |
| 90 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 91 | Mills, H. E. | Lipan, TX 76462 | Oil & Gas Operator | Sep 2004 |
| 92 | Mississippi Ventures, Inc. | Granbury, TX 76048 | Gas Operator | Jul 1997 |
| 93 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 94 | MKS Consulting Corporation | Weatherford, TX 76086 | Oil & Gas Operator | Jul 2005 |
| 95 | MKS Natural Gas Company | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2016 |
| 96 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 97 | Nichols Oil & Gas Corporation | Shreveport, LA 71135 | Oil & Gas Operator | Aug 2003 |
| 98 | Nichols,Edwin S Explorations Inc | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 99 | Oakridge Oil And Gas, LP | Jacksboro, TX 76458 | Oil & Gas Operator | May 2025 |
| 100 | Odegard Energy, Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2020 |