| 1 | 101 Energy Corporation | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Dec 2025 |
| 2 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 3 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 4 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 5 | Advantage Oil & Gas, Inc. | Pinehurst, TX 77362 | Oil & Gas Operator | Feb 2026 |
| 6 | Aegis Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Sep 1998 |
| 7 | Agp Energy Services LLC | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 8 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 9 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 10 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 11 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 12 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 13 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 14 | Associated Operating & Explor. | Dallas, TX 75243 | Oil & Gas Operator | Feb 2026 |
| 15 | Atasca Resources, Inc. | Houston, TX 77219 | Oil & Gas Operator | Feb 2026 |
| 16 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 17 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 18 | Atropos Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 19 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Feb 2026 |
| 20 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 21 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Feb 2026 |
| 22 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 23 | Bandera Exploration Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2017 |
| 24 | Barbee, R.L. Operating, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Feb 2026 |
| 25 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 26 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 27 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Feb 2026 |
| 28 | BDR Energy Corporation | Corpus Chrsti, TX 78463 | Oil & Gas Operator | Mar 1998 |
| 29 | Beckham Resources, Inc. | Houston, TX 77010 | Oil & Gas Operator | Mar 2011 |
| 30 | Beehive Operating, LLC | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 31 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Feb 2026 |
| 32 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 33 | Bennett, Mills Estate | Houston, TX 77057 | Oil & Gas Operator | Sep 1995 |
| 34 | Bepco Operating Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2006 |
| 35 | Bepco, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2008 |
| 36 | Besco Operating, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2026 |
| 37 | BL Production, LLC | Abilene, TX 79606 | Oil Operator | Feb 2026 |
| 38 | Blackbeard Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 39 | Bluefin Resources LLC | Houston, TX 77079 | Oil & Gas Operator | Oct 2023 |
| 40 | Bluestone Natural Res. II, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2019 |
| 41 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 42 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 43 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 44 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 45 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 46 | Burns Production Corporation | Midland, TX 79701 | Oil & Gas Operator | Jul 2008 |
| 47 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Feb 2026 |
| 48 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Feb 2026 |
| 49 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Nov 2025 |
| 50 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 51 | Cal-Tex Exploration & Production Company LLC | San Antonio, TX 78228 | Oil & Gas Operator | Feb 2026 |
| 52 | Caltex Energy Co. | Luling, TX 78648 | Oil & Gas Operator | Feb 2026 |
| 53 | Cantera Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2017 |
| 54 | Canyon Creek Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 55 | Carrizo Oil & Gas, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 56 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 57 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 58 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2026 |
| 59 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 60 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Feb 2026 |
| 61 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 62 | Cody Energy LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2020 |
| 63 | Collins Resources, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2011 |
| 64 | Cometra Oil And Gas, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1997 |
| 65 | Comstock Oil & Gas, Inc. | Frisco, TX 75034 | Oil & Gas Operator | Dec 2012 |
| 66 | Conoco Inc | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 67 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 68 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 69 | Corpus Christi Leaseholds, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Sep 1996 |
| 70 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 71 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 72 | Cotton, W. L. | Hebbronville, TX 78361 | Oil & Gas Operator | Mar 1996 |
| 73 | Cotton, W.L. Gems & Minerals LTD | Hebbronville, TX 78361 | Oil & Gas Operator | May 2000 |
| 74 | Crimson Exploration Oper., Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 75 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2025 |
| 76 | D. O. G. Operating, LLC | Port Aransas, TX 78373 | Oil & Gas Operator | Feb 2026 |
| 77 | D.Y. Exploration, Inc. | Boise, ID 83705 | Oil & Gas Operator | Feb 2026 |
| 78 | D90 Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 79 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 80 | Denali Oil & Gas Management LLC | Houston, TX 77060 | Oil & Gas Operator | Dec 2012 |
| 81 | Dewbre Petroleum Corporation | Corpus Chrsti, TX 78404 | Oil & Gas Operator | Feb 2026 |
| 82 | Diamond Oil & Gas LLC | Casper, WY 82604 | Oil & Gas Operator | Dec 2025 |
| 83 | Dinero Oil Corporation | Corpus Chrsti, TX 78460 | Oil & Gas Operator | Nov 1999 |
| 84 | Dirnett, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | Feb 2026 |
| 85 | Discorbis Oil Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2019 |
| 86 | Dogwood Operating Company, Inc. | Houston, TX 77069 | Oil & Gas Operator | Feb 2026 |
| 87 | Dolphin Petroleum | Alice, TX 78333 | Oil & Gas Operator | Jun 2008 |
| 88 | Dominion Corporation | Houston, TX 77001 | Oil & Gas Operator | Dec 2010 |
| 89 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 90 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 91 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 92 | Durst Oil Company | Corpus Chrsti, TX 78477 | Oil & Gas Operator | Sep 2000 |
| 93 | E.G. Operating | Dallas, TX 75206 | Oil & Gas Operator | Mar 2008 |
| 94 | E.G.L. Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 95 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 96 | Edge Petroleum Oper. Co., Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 97 | El Dorado Gas & Oil, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 98 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 99 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | Feb 2026 |
| 100 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Dec 2025 |