| 1 | 1789 Management, LLC | Houston, TX 77024 | Gas Operator | Sep 2025 |
| 2 | A A Production Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 1998 |
| 3 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 4 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 5 | Ada Belle Oil & Gas Company | Sourlake, TX 77659 | Oil Operator | Dec 2023 |
| 6 | Aeon Operating, Inc. | Fate, TX 75132 | Oil & Gas Operator | Sep 2025 |
| 7 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Sep 2025 |
| 8 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 9 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 10 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 11 | Anderson, James K. Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 2025 |
| 12 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 13 | Approach Operating LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2020 |
| 14 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Sep 2025 |
| 15 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 16 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 17 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Sep 2025 |
| 18 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 19 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Sep 2025 |
| 20 | Beehive Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 21 | Berry Oil Comp. | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 22 | Berry Oil Company, LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Apr 2019 |
| 23 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Jun 2025 |
| 24 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 25 | Bexco Operating, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Sep 2025 |
| 26 | BHB Operating Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Sep 2025 |
| 27 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 28 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Sep 2025 |
| 29 | Black Jack Services, L.L.C. | Bastrop, TX 78602 | Oil & Gas Operator | Sep 2025 |
| 30 | Bluco Production Co., Inc. | Austin, TX 78716 | Oil & Gas Operator | Sep 2025 |
| 31 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2025 |
| 32 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 33 | Brazos Resources, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Dec 1998 |
| 34 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 35 | Brooks Petroleum Inc | Kilgore, TX 75663 | Oil & Gas Operator | May 1999 |
| 36 | Brown Oil & Gas Co. | Mexia, TX 76667 | Oil & Gas Operator | Sep 2025 |
| 37 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 38 | Brown, C. L. Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1999 |
| 39 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 40 | Brown, H.L. Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 41 | Brown, J. Burns Operating Co. | Havre, MT 59501 | Oil & Gas Operator | Jun 2025 |
| 42 | Bryant - Chase Energy Corp. | Tyler, TX 75701 | Oil & Gas Operator | Aug 2004 |
| 43 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Sep 2025 |
| 44 | Cbmoncrief Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 45 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 46 | CD Consulting & Operating Co. | Bridgeport, TX 76426 | Oil & Gas Operator | Sep 2025 |
| 47 | Cemco Oil | Corsicana, TX 75110 | Oil & Gas Operator | Sep 2025 |
| 48 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2018 |
| 49 | CH4 Energy LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2006 |
| 50 | CH4 Energy Six, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Sep 2025 |
| 51 | Chase Energy, Inc. | Austin, TX 78763 | Oil & Gas Operator | Oct 2001 |
| 52 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 53 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2025 |
| 54 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 55 | China Star Oil Co., LLC | Woodway, TX 76712 | Oil & Gas Operator | Jun 2010 |
| 56 | Circle-S Energy, LLC | McKinney, TX 75071 | Oil & Gas Operator | Sep 2025 |
| 57 | CL&F Operating LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2022 |
| 58 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 59 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Apr 2025 |
| 60 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 61 | Comstock Oil & Gas, LLC | Frisco, TX 75034 | Oil & Gas Operator | Sep 2025 |
| 62 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 63 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 64 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 65 | Costilla Energy Inc | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 66 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 67 | Craton Operating LLC | Bellaire, TX 77401 | Oil & Gas Operator | Sep 2025 |
| 68 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Sep 2025 |
| 69 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 70 | Crow, David | Shreveport, LA 71106 | Oil & Gas Operator | May 2001 |
| 71 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Sep 2025 |
| 72 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 73 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 74 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 75 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 76 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Sep 2025 |
| 77 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 78 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 79 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 80 | Earthstone Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2017 |
| 81 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Sep 2025 |
| 82 | Edf Trading Resources, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2015 |
| 83 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 84 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 85 | Encrescent, LLC | Dallas, TX 75205 | Oil & Gas Operator | Sep 2025 |
| 86 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | May 2025 |
| 87 | Energy Transfer Fuel, LP | Houston, TX 77002 | Oil & Gas Operator | Apr 2005 |
| 88 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 89 | Ensign Operating Co. | Denver, CO 80202 | Oil & Gas Operator | Jan 2004 |
| 90 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2025 |
| 91 | Escondido Petroleum Company, Inc | Houston, TX 77063 | Oil & Gas Operator | Sep 2025 |
| 92 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 93 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 94 | Etoco Incorporated | Houston, TX 77002 | Oil & Gas Operator | May 2005 |
| 95 | Etx Energy, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2022 |
| 96 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Jun 2025 |
| 97 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 98 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | Sep 2025 |
| 99 | Fortson Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2020 |
| 100 | Forum Exploration Co., L.P. | Tyler, TX 75710 | Oil & Gas Operator | Apr 2010 |