| 1 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 2 | 4R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Apr 1997 |
| 3 | 5R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Sep 2025 |
| 4 | 77 Oil Properties, Inc. | Wichita Falls, TX 76307 | Gas Operator | Mar 2002 |
| 5 | 801 LLC | Artesia, NM 88211 | Oil & Gas Operator | Oct 2023 |
| 6 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 7 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Sep 2025 |
| 8 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 9 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 10 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 11 | Amity Oil Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1977 |
| 12 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 13 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 14 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 15 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Sep 2025 |
| 16 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jun 2025 |
| 17 | Andrew Alan Exploration, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2017 |
| 18 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Sep 2025 |
| 19 | Apex Royalties, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 1997 |
| 20 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 21 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 22 | Arena Resources LLC | Longview, TX 75608 | Oil & Gas Operator | Jun 2025 |
| 23 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2025 |
| 24 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 25 | Arlen Corporation | Houston, TX 77077 | Oil & Gas Operator | Mar 2008 |
| 26 | Arrowhead Energy Exp., LLC | Baton Rouge, LA 70816 | Oil & Gas Operator | Nov 2006 |
| 27 | Arrowhead Enterprises, Inc. | Baton Rouge, LA 70816 | Oil & Gas Operator | Apr 2001 |
| 28 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 29 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 30 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Sep 2025 |
| 31 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Sep 2025 |
| 32 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 33 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 34 | Bachtell Oil & Gas, LTD. | Longview, TX 75605 | Oil & Gas Operator | Sep 2025 |
| 35 | Bachtell, Charles Ray | Longview, TX 75605 | Oil & Gas Operator | Feb 2004 |
| 36 | Banner Oil & Gas LLC | Oklahoma City, OK 73159 | Oil & Gas Operator | May 2025 |
| 37 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Sep 2025 |
| 38 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Sep 2025 |
| 39 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Sep 2025 |
| 40 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 41 | Beckville Disp Operations, LLC | Henderson, TX 75652 | Oil Operator | Sep 2025 |
| 42 | Benco Energy Inc | Tionesta, PA 16353-5851 | Oil & Gas Operator | Dec 2002 |
| 43 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 44 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 45 | Bigfoot Energy Services LLC | Carthage, TX 75633 | Oil & Gas Operator | Aug 2024 |
| 46 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 47 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 48 | Black Horse Resources, LLC | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2024 |
| 49 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Sep 2025 |
| 50 | Blue Dome Operating, LLC | Tulsa, OK 74119 | Gas Operator | Sep 2025 |
| 51 | Bowerman Energy Company | Arlington, TX 76004 | Oil & Gas Operator | Dec 2006 |
| 52 | Bowles Energy, Inc. | Longview, TX 75601 | Oil & Gas Operator | Sep 2025 |
| 53 | Bowles Properties, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 1998 |
| 54 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 55 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | Sep 2025 |
| 56 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 57 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2025 |
| 58 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Sep 2025 |
| 59 | Brammer-Keystone Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 60 | Brandon Energy, Inc. | Bullard, TX 75757 | Oil & Gas Operator | Nov 2007 |
| 61 | Brangus Energy LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 62 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 63 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 64 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 65 | Brock Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2019 |
| 66 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2025 |
| 67 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | Sep 2025 |
| 68 | Brothers Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2004 |
| 69 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2025 |
| 70 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 71 | Buckhorn Operating LLC | MT Enterprise, TX 75681 | Oil & Gas Operator | Sep 2025 |
| 72 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 2025 |
| 73 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 74 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 75 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 76 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | Sep 2025 |
| 77 | C E L Inc | Bartlesville, OK 74006 | Oil & Gas Operator | Jan 2020 |
| 78 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 79 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 80 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 81 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 82 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | Sep 2025 |
| 83 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Sep 2025 |
| 84 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 85 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 86 | Cavalry Resources LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2010 |
| 87 | Cci East Texas Upstream LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2021 |
| 88 | Chalker Energy Management II,LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 89 | Chalker Energy Management,LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 90 | Channel Production Company | Marshall, TX 75670 | Oil & Gas Operator | Sep 2025 |
| 91 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 92 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Sep 2025 |
| 93 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 94 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2025 |
| 95 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2025 |
| 96 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 97 | Chisos, LTD | Houston, TX 77098 | Oil & Gas Operator | Sep 2025 |
| 98 | Cinron Energy, LLC | Arp, TX 75750 | Oil & Gas Operator | Sep 2025 |
| 99 | CL&F Operating LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2022 |
| 100 | Classic Energy Incorporated | Tyler, TX 75701 | Oil & Gas Operator | Jul 2005 |