| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | 4-Sight Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2006 |
| 3 | 4-Sight Operating Company, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 4 | 4R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Apr 1997 |
| 5 | 5R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Jul 2025 |
| 6 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | Jul 2025 |
| 7 | A J A Companies | Tyler, TX 75703 | Oil Operator | Jul 2025 |
| 8 | Acirema Corporation | Longview, TX 75608 | Oil & Gas Operator | Jul 2025 |
| 9 | Adamson Exploration Co. | Kilgore, TX 75662 | Oil Operator | Jul 2025 |
| 10 | Adamson Exploration Corporation | Kilgore, TX 75662 | Oil & Gas Operator | Mar 2008 |
| 11 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 12 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 13 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Jul 2025 |
| 14 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 15 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 16 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 17 | Armor Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jul 2025 |
| 18 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 19 | Atlantic & Gulf Petroleum Co. | Houston, TX 77002 | Gas Operator | Mar 1991 |
| 20 | Atoka Energy LLC | Gainesville, TX 76241 | Oil & Gas Operator | Jul 2025 |
| 21 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Jul 2025 |
| 22 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 23 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Jul 2025 |
| 24 | Beehive Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 25 | Bent Wing Energy, LLC | Austin, TX 78746 | Oil & Gas Operator | Jul 2025 |
| 26 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 27 | Black Diamond Operating Co., LLC | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2009 |
| 28 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Jul 2025 |
| 29 | Block T Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 30 | Bluejay Energy Corporation | Waxahachie, TX 75168 | Oil Operator | Feb 2008 |
| 31 | Bowles Properties, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 1998 |
| 32 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 33 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 34 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 35 | Branta Production Company LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jul 2025 |
| 36 | Brashear Production Service, Inc | Longview, TX 75602 | Oil & Gas Operator | Mar 2008 |
| 37 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 38 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 39 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 40 | Brian Energy | Kilgore, TX 75663 | Oil & Gas Operator | May 2013 |
| 41 | Brooks Petroleum Company | Tyler, TX 75703 | Oil & Gas Operator | Jul 2025 |
| 42 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Jul 2025 |
| 43 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 44 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 45 | Bryant & Carr, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1994 |
| 46 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jul 2025 |
| 47 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 48 | Buttram Energies Inc | Oklahoma City, OK 73112-7235 | Oil & Gas Operator | Nov 2021 |
| 49 | C & D Energy Company, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 1994 |
| 50 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | Jul 2025 |
| 51 | Calico Operating Co., Inc. | Dallas, TX 75205 | Oil & Gas Operator | Dec 2002 |
| 52 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jul 2025 |
| 53 | Cardinal Operating Corporation | Waxahachie, TX 75165 | Oil & Gas Operator | Jan 1997 |
| 54 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Jul 2025 |
| 55 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 56 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 57 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 58 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 59 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2025 |
| 60 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 61 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 62 | Clark, Richard E., Inc. | Longview, TX 75604 | Oil & Gas Operator | May 2001 |
| 63 | Classic Operating Co. LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 64 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 65 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 66 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 67 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 68 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 69 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 70 | Cotton Valley Operations, Inc. | Longview, TX 75608 | Oil & Gas Operator | Jul 2025 |
| 71 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 72 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Jul 2025 |
| 73 | Cox Resources Corporation | Dallas, TX 75244 | Oil & Gas Operator | Mar 2015 |
| 74 | Cox, Robert G. & Associates,Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 1994 |
| 75 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Jul 2025 |
| 76 | Crestmont Operating LLC | New York, NY 10151 | Oil Operator | Jul 2025 |
| 77 | Cross Creek Energy LLC | Houston, TX 77074 | Oil & Gas Operator | Aug 2013 |
| 78 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 79 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Jul 2025 |
| 80 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 81 | D-S-B Properties, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 82 | Daco Oil | Joinerville, TX 75658 | Oil & Gas Operator | Aug 2019 |
| 83 | Dallas Production Company LLC | Dallas, TX 75206 | Oil & Gas Operator | Jul 2025 |
| 84 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 85 | Danmark Energy Services, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Apr 2021 |
| 86 | Desana Development Corporation | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 87 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 88 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 89 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Jul 2025 |
| 90 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 91 | Douglas Investments Inc | Fort Worth, TX 76137 | Oil Operator | Jan 2020 |
| 92 | DPMP Energy LLC | Prosper, TX 75078 | Oil & Gas Operator | Dec 2023 |
| 93 | Dyersdale Energy, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 94 | Dyersdale Production Co, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 95 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Jul 2025 |
| 96 | Eastex Crude Company, LLC | Leesburg, TX 75451 | Oil & Gas Operator | Jul 2025 |
| 97 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 98 | El Paso Production Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 99 | Elms Oil Company | Kilgore, TX 75663 | Oil & Gas Operator | Jul 2025 |
| 100 | Enbridge Pipelines (Ne Texas) LP | Houston, TX 77002 | Oil & Gas Operator | Jan 2010 |