| 1 | 1849 Energy Partners Oprtng, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2022 |
| 2 | 3 S Production, Inc. | Cisco, TX 76437 | Oil & Gas Operator | Apr 2025 |
| 3 | 360 Mining, Inc. | Austin, TX 78701 | Gas Operator | Apr 2025 |
| 4 | A & D Exploration Company | Rockport, TX 78381 | Oil & Gas Operator | Apr 2025 |
| 5 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 6 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 7 | Aeternum Energy, LLC | Nederland, TX 77627 | Oil & Gas Operator | Apr 2025 |
| 8 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 9 | American West Resources, Inc | Fort Worth, TX 76161 | Oil & Gas Operator | Apr 2025 |
| 10 | Antero Resources I, LP | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 11 | Apex Operating & Equip. Co. | Bowie, TX 76230 | Oil & Gas Operator | Nov 2003 |
| 12 | Arp Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 13 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 14 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2025 |
| 15 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Jan 2025 |
| 16 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 17 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 18 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | Apr 2025 |
| 19 | August Oil | Plano, TX 75093 | Oil & Gas Operator | Aug 2003 |
| 20 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 21 | Bechel Oil LLC | Maiden Rock, WI 54750 | Oil Operator | Feb 2022 |
| 22 | Bedrock Production, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 23 | Bend Petroleum Corp | Muenster, TX 76252 | Oil & Gas Operator | Nov 2023 |
| 24 | Best Petroleum Explorations,Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Apr 2025 |
| 25 | BKV Barnett, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2025 |
| 26 | BKV North Texas, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2025 |
| 27 | Black Oil Company, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 28 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Apr 2025 |
| 29 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 30 | Bob & Ted'S Operating | Lewisville, TX 75067 | Oil & Gas Operator | Apr 1993 |
| 31 | Borderline Operating Corp. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 32 | Braden Exploration, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2011 |
| 33 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2025 |
| 34 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2025 |
| 35 | Bravo Natural Resources, Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2009 |
| 36 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 37 | Briley Operating, LLC | Abilene, TX 79608 | Oil & Gas Operator | Apr 2025 |
| 38 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 39 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 40 | Buttram Energies Inc | Oklahoma City, OK 73112-7235 | Oil & Gas Operator | Nov 2021 |
| 41 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | Apr 2025 |
| 42 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 43 | Canan Operating, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 44 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 45 | Caribbean Energy, L.L.C. | Cotulla, TX 78014 | Oil & Gas Operator | Nov 2019 |
| 46 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 47 | Carter Energy Corporation | Duncanville, TX 75138 | Oil & Gas Operator | Sep 2010 |
| 48 | Case Resources, LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2025 |
| 49 | CB Energy Partners, LLC | Odessa, TX 79765 | Oil & Gas Operator | Apr 2025 |
| 50 | Chaparral Natural Resources,Inc. | Austin, TX 78746 | Oil & Gas Operator | Apr 2025 |
| 51 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2025 |
| 52 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 53 | Chesapeake Permian LP | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Feb 2015 |
| 54 | Chief Oil & Gas LLC | Dallas, TX 75225 | Oil & Gas Operator | Feb 2022 |
| 55 | Chief Operating LLC | Dallas, TX 75225 | Gas Operator | Mar 2009 |
| 56 | Clearfork Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2011 |
| 57 | Clearfork Production, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 58 | Co Energy | Benbrook, TX 76126 | Oil & Gas Operator | Apr 2025 |
| 59 | Colo Exploration Company, Inc. | Benbrook, TX 76126 | Oil & Gas Operator | Apr 2025 |
| 60 | Concord Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2021 |
| 61 | Cortez Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2016 |
| 62 | Cox, Robert G. & Associates,Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 1994 |
| 63 | Crow Creek Operating Co II LLC | Houston, TX 77252 | Oil & Gas Operator | Jul 2011 |
| 64 | Crusader Energy Group Inc. | Austin, TX 78746 | Oil & Gas Operator | Mar 2015 |
| 65 | Crusader Energy Group, LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2015 |
| 66 | Cso Consulting | Bridgeport, TX 76426 | Oil & Gas Operator | Mar 2020 |
| 67 | Cundiff Operating Company | Dallas, TX 75238 | Oil & Gas Operator | Apr 2025 |
| 68 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 69 | Dallas Royalty, Inc. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2012 |
| 70 | Dark Horse Operating Co., L.L.C. | Denton, TX 76202 | Oil & Gas Operator | Oct 2022 |
| 71 | Decleva, Paul | Wichita Falls, TX 76302 | Oil & Gas Operator | Dec 2020 |
| 72 | Denton Exploration, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 73 | Denton Oil & Gas | Argyle, TX 76226 | Oil Operator | Dec 2014 |
| 74 | Derwen Operating Company | Houston, TX 77098 | Gas Operator | Dec 2009 |
| 75 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 76 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 77 | Devon Gas Services, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2023 |
| 78 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Apr 2025 |
| 79 | DJ Resources Inc | Bowie, TX 76230 | Oil & Gas Operator | Nov 2017 |
| 80 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Apr 2025 |
| 81 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 82 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 83 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 84 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Apr 2025 |
| 85 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 86 | Eagleridge Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 87 | Ebs Oil & Gas Partners Op.Co.,LP | Dallas, TX 75219 | Oil & Gas Operator | May 2006 |
| 88 | El Reno Energy, LLC | Granbury, TX 76048 | Oil & Gas Operator | Apr 2025 |
| 89 | Embassy Oil Company | Highland VLG, TX 75077 | Oil & Gas Operator | Apr 2025 |
| 90 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 91 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 92 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 93 | Energy Transfer Crude Marketing LLC | Houston, TX 77002 | Oil Operator | Jan 2025 |
| 94 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 95 | Enexco, Inc. | Dallas, TX 75243 | Oil & Gas Operator | Mar 2017 |
| 96 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 97 | Enre LP | Kingwood, TX 77339 | Oil & Gas Operator | Feb 2004 |
| 98 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 99 | Eurotex Royalty, Inc. | Arlington, TX 76012 | Oil & Gas Operator | Aug 2003 |
| 100 | Excel Oil & Gas, Inc. | Waxahachie, TX 75168 | Oil & Gas Operator | Apr 2025 |