| 1 | 1776 Energy Operators, LLC | Houston, TX 77070 | Oil & Gas Operator | May 2025 |
| 2 | 1836 Resources, LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2019 |
| 3 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | May 2025 |
| 4 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 5 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | May 2025 |
| 6 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | May 2025 |
| 7 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 8 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 9 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 10 | Alyana Energy Corporation | Houston, TX 77227 | Oil & Gas Operator | Apr 1995 |
| 11 | American Delta Corporation | Portland, TX 78374 | Oil & Gas Operator | Jun 2013 |
| 12 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 13 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 14 | Amerril Energy LLC | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 15 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 16 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 17 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 18 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 19 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 20 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 21 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 22 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 23 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 24 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 25 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 26 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 27 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 28 | Arete Operating Company, LLC | San Antonio, TX 78260 | Oil & Gas Operator | May 2025 |
| 29 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 30 | Armour Resource Holdings, LTD. | Houston, TX 77046 | Oil & Gas Operator | Nov 1994 |
| 31 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | May 2025 |
| 32 | Atkinson, Clifford III | San Antonio, TX 78217 | Oil & Gas Operator | Dec 1996 |
| 33 | Aurora USA Development, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 34 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 35 | B J Resources, L.L.C. | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 36 | B.W.O.C., Inc. | Plano, TX 75026 | Oil & Gas Operator | May 2025 |
| 37 | Balcones Production Company | Houston, TX 77002 | Oil & Gas Operator | Feb 1996 |
| 38 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 39 | Barrett Brothers Oil & Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2020 |
| 40 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | May 2025 |
| 41 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 42 | Battlecat Oil & Gas, LLC | Houston, TX 77082 | Oil & Gas Operator | Jul 2017 |
| 43 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 44 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 45 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | May 2025 |
| 46 | Bayshore Operating Co. | Ingleside, TX 78362 | Oil & Gas Operator | Mar 2009 |
| 47 | Bayshore Operating Corp., L.L.C. | Luling, TX 78648 | Oil Operator | May 2025 |
| 48 | Baytex Energy USA, Inc. | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 49 | Baytex USA Development, LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2017 |
| 50 | BB-Southtex, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2024 |
| 51 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 52 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | May 2025 |
| 53 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 54 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 55 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 56 | Bishop, J. E., Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2012 |
| 57 | Bissell Operating LLC | San Antonio, TX 78216 | Oil Operator | Oct 2016 |
| 58 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 59 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 60 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | May 2025 |
| 61 | Bluco Production Co., Inc. | Austin, TX 78716 | Oil & Gas Operator | May 2025 |
| 62 | Blue Wing Energy, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 63 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | May 2025 |
| 64 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 65 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 66 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 67 | Brayton Oil Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Dec 1994 |
| 68 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 69 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 70 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 71 | Britanco, L.L.C. | Falls City, TX 78113 | Oil & Gas Operator | May 2025 |
| 72 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | May 2025 |
| 73 | Bruington Operating, L.L.C. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2015 |
| 74 | Bruns, H. D. | Scottsville, VA 24590 | Oil & Gas Operator | Feb 2007 |
| 75 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 76 | Caldera Operating Company LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2021 |
| 77 | Cannan, Morris | San Antonio, TX 78205 | Oil & Gas Operator | May 2025 |
| 78 | Canyon Oil & Gas Exploration LLC | San Antonio, TX 78258 | Oil & Gas Operator | May 2002 |
| 79 | Carey, Shirley L. Trust | Abilene, TX 79608 | Oil & Gas Operator | May 2025 |
| 80 | Carter Exploration Company | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2015 |
| 81 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 82 | CB Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Nov 2017 |
| 83 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | May 2025 |
| 84 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 85 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | May 2025 |
| 86 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 87 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 88 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2025 |
| 89 | Christico Petroleum Company | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 90 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 91 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 92 | Cinco Natural Resources Corp | La Grange, TX 78945 | Oil & Gas Operator | May 2025 |
| 93 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 94 | Clay Exploration, Inc. | Spring, TX 77387 | Oil & Gas Operator | Jun 2019 |
| 95 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 96 | CMS Nomeco Oil & Gas Co. | Jackson, MI 49201 | Oil & Gas Operator | Jan 2015 |
| 97 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 98 | Coates Energy Interests, LTD. | San Antonio, TX 78217 | Oil & Gas Operator | Aug 1997 |
| 99 | Coleville Petroleum Company | McAllen, TX 78503 | Oil & Gas Operator | Mar 1996 |
| 100 | Compass Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |