| 1 | 3-T Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 2 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | May 2025 |
| 3 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 4 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 5 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 6 | American West | Burkett, TX 76828 | Oil & Gas Operator | May 2025 |
| 7 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 8 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 9 | Andrews & Corkran, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Feb 2000 |
| 10 | Antero Resources II, LP | Denver, CO 80202 | Oil & Gas Operator | May 2006 |
| 11 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 12 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 13 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 14 | Arena Resources LLC | Longview, TX 75608 | Oil & Gas Operator | Mar 2025 |
| 15 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 16 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 17 | Arlian, Inc. | Denver, CO 80202 | Oil Operator | Feb 1998 |
| 18 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 19 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 20 | B J Resources, L.L.C. | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 21 | Bannon Energy Inc | Houston, TX 77068 | Oil & Gas Operator | Jun 1998 |
| 22 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 23 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 24 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 25 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | May 2025 |
| 26 | Beaver Oil & Gas Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 27 | Bell & Kinley Company | Piedmont, OK 73078 | Oil & Gas Operator | Aug 2017 |
| 28 | Berkshire Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 29 | Berkshire Woodlawn Field, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 30 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 31 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 32 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 33 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | May 2025 |
| 34 | Booher Engineering, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 35 | Bowles Energy, Inc. | Longview, TX 75601 | Oil & Gas Operator | May 2025 |
| 36 | Bowles Properties, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 1998 |
| 37 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 38 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 39 | Bralex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | May 2025 |
| 40 | Brandon Energy, Inc. | Bullard, TX 75757 | Oil & Gas Operator | Nov 2007 |
| 41 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 42 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 43 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 44 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 45 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 46 | Brooks Petroleum Company | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 47 | Brothers Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2004 |
| 48 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 49 | Bryant & Carr, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 1994 |
| 50 | Bryant - Chase Energy Corp. | Tyler, TX 75701 | Oil & Gas Operator | Aug 2004 |
| 51 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 52 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 53 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 54 | Buttram Energies Inc | Oklahoma City, OK 73112-7235 | Oil & Gas Operator | Nov 2021 |
| 55 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | May 2025 |
| 56 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 57 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | May 2025 |
| 58 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 59 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 60 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 61 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | May 2025 |
| 62 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 63 | Cape Operating, Inc. | Longview, TX 75608 | Oil & Gas Operator | Nov 2007 |
| 64 | Cape, Randy | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 65 | Card Operating Company, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 1995 |
| 66 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 67 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 68 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 69 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Feb 2025 |
| 70 | Chalker Energy Management II,LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 71 | Challenger Energy SVCS Co., LLC | Kilgore, TX 75663 | Oil Operator | May 2025 |
| 72 | Chase Energy, Inc. | Austin, TX 78763 | Oil & Gas Operator | Oct 2001 |
| 73 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 74 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 75 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 76 | Cinron Energy, LLC | Arp, TX 75750 | Oil & Gas Operator | May 2025 |
| 77 | Cippele Resources Co. | Longview, TX 75608 | Oil & Gas Operator | May 1994 |
| 78 | Circle Ridge Production, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 79 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 80 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 81 | CNS Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2010 |
| 82 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 83 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 84 | Cook Exploration Co. | Longview, TX 75602 | Oil & Gas Operator | May 2025 |
| 85 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 86 | Couch, Gilbert | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 87 | Craton Energy Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2005 |
| 88 | Craton Operating LLC | Bellaire, TX 77401 | Oil & Gas Operator | May 2025 |
| 89 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 90 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 91 | D & H Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2024 |
| 92 | D-S-B Properties, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2014 |
| 93 | D-S-B Properties, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 94 | Dale Operating Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 95 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 96 | Danmark Energy Services, Inc. | White Oak, TX 75693 | Oil & Gas Operator | Apr 2021 |
| 97 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2025 |
| 98 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Apr 2025 |
| 99 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 100 | Donnell Pipe & Supply Co/TX Corp | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2008 |