| 1 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | Feb 2026 |
| 2 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Feb 2026 |
| 3 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 4 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 5 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 6 | Altalay STX LLC | San Juan, PR 00968 | Oil & Gas Operator | Feb 2026 |
| 7 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 8 | Amax Oil & Gas Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 9 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 10 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 11 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 12 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 13 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 14 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 15 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Feb 2026 |
| 16 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 17 | Arete Operating Company II, LLC | San Antonio, TX 78260 | Oil & Gas Operator | Feb 2026 |
| 18 | Arete Operating Company, LLC | San Antonio, TX 78260 | Oil & Gas Operator | Feb 2026 |
| 19 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 20 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Nov 2025 |
| 21 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 22 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Feb 2026 |
| 23 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 24 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Feb 2026 |
| 25 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 26 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Feb 2026 |
| 27 | BDR Energy Corporation | Corpus Chrsti, TX 78463 | Oil & Gas Operator | Mar 1998 |
| 28 | Beaver Oil & Gas Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 29 | Beehive Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 30 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Feb 2026 |
| 31 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 32 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 33 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 34 | BFD Energy Corporation | Georgetown, TX 78628 | Gas Operator | May 1998 |
| 35 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 36 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 37 | Black Bear Oil Corporation | Las Vegas, NV 89128 | Oil & Gas Operator | Dec 2025 |
| 38 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 39 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Feb 2026 |
| 40 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 41 | Bluestone Natural Resources, LLC | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2015 |
| 42 | BNR Operating, LLC | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 43 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | Feb 2026 |
| 44 | Bordertown Energy Resources, LLC | Bryan, TX 77802 | Oil & Gas Operator | Feb 2026 |
| 45 | BPL Exploration, LTD. | Corpus Chrsti, TX 78418 | Oil & Gas Operator | Jan 2012 |
| 46 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Nov 2025 |
| 47 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 48 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 49 | Brighton Energy, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 50 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 51 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2026 |
| 52 | Burk Royalty Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jan 2002 |
| 53 | Bustamante Oil Company | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 54 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Feb 2026 |
| 55 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 56 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 57 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2005 |
| 58 | Camden Oil & Gas, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Dec 2005 |
| 59 | Cantera Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2017 |
| 60 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 61 | Central Gulf Petroleum Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 62 | Cfo Resources, Inc. | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Feb 2026 |
| 63 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 64 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 65 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 66 | Choctaw II Oil & Gas, LTD. | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 67 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 68 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 69 | CLR Secondary Recovery, LLC | Wichita Falls, TX 76306 | Oil & Gas Operator | Feb 2026 |
| 70 | CNG Producing Company | New Orleans, LA 70112 | Oil & Gas Operator | Dec 2015 |
| 71 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 72 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |
| 73 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 74 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 75 | Collins & Ware, Inc. | Midland, TX 79701 | Oil & Gas Operator | Aug 2003 |
| 76 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 77 | Columbus Energy Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2008 |
| 78 | Columbus Energy, LLC | Houston, TX 77046 | Oil & Gas Operator | Feb 2026 |
| 79 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 80 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 81 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 82 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 83 | Continental Exploration LLC | Richardson, TX 75080 | Oil & Gas Operator | Feb 2026 |
| 84 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 85 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Feb 2026 |
| 86 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 87 | Cory, Kenneth W. LTD. | Bellaire, TX 77401 | Oil & Gas Operator | Feb 2026 |
| 88 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 89 | Cowrie Energy LLC | Austin, TX 78703 | Oil & Gas Operator | Feb 2026 |
| 90 | Cox & Perkins Exploration, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 91 | Cox, Martin Regan | Irving, TX 75014 | Oil & Gas Operator | Feb 2026 |
| 92 | Crest Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 93 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 94 | Dale Operating Company | Dallas, TX 75207 | Oil & Gas Operator | Feb 2026 |
| 95 | Dash Production Company, Inc. | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 2026 |
| 96 | Davis Asset Management, Inc. | Houston, TX 77010 | Oil & Gas Operator | Dec 2004 |
| 97 | Davis Southern Operating Co LLC | Houston, TX 77004 | Oil & Gas Operator | Feb 2026 |
| 98 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 99 | Denali Oil & Gas Management LLC | Houston, TX 77060 | Oil & Gas Operator | Dec 2012 |
| 100 | Devon Energy Corp (Nevada) | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2017 |