| 1 | 2 D Oil & Gas LLC | Refugio, TX 78377 | Oil & Gas Operator | May 2025 |
| 2 | 84 Energy LLC | Sugar Land, TX 77487 | Oil & Gas Operator | May 2025 |
| 3 | A-G-B, Inc. | Houston, TX 77084 | Oil & Gas Operator | Aug 2003 |
| 4 | A.O.E. Operators, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | May 2025 |
| 5 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 6 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | May 2025 |
| 7 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 8 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 9 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 10 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | May 2025 |
| 11 | Albrecht, Phil A., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Jun 2005 |
| 12 | Alcorn Prod Co. | Victoria, TX 77902 | Oil & Gas Operator | Mar 1997 |
| 13 | Aldine Oil And Gas, LP | Houston, TX 77060 | Oil & Gas Operator | May 2025 |
| 14 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 15 | All Am, Inc. | Houston, TX 77057 | Oil & Gas Operator | Feb 2016 |
| 16 | Allegiant Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 17 | Allegro Investments, Inc. | Victoria, TX 77903 | Oil & Gas Operator | Nov 2020 |
| 18 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 19 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 20 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 21 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 22 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 23 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 24 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 25 | American Int'L Energy Corp. | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 26 | American Pumping & Trucking | New Braunfels, TX 78131 | Oil & Gas Operator | May 2025 |
| 27 | American Shoreline, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 28 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 29 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 30 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 31 | Ampak Oil Company | Plano, TX 75074 | Oil & Gas Operator | May 2025 |
| 32 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 33 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 34 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 35 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | May 2025 |
| 36 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | May 2025 |
| 37 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 38 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 39 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 40 | Arriola Operating & Consltg Inc. | Dallas, TX 75248 | Oil Operator | May 2025 |
| 41 | Arrowhead Enterprises, Inc. | Baton Rouge, LA 70816 | Oil & Gas Operator | Apr 2001 |
| 42 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 43 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 44 | Atinum Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 45 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 46 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 47 | Averill, W. M. Inc. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2003 |
| 48 | B & G Energy Corporation | Dallas, TX 75214 | Oil & Gas Operator | May 2025 |
| 49 | B D Production Co., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 50 | B.N.B. Production Inc. | Austin, TX 78720 | Oil & Gas Operator | May 1996 |
| 51 | B.P. Productions Inc. | Victoria, TX 77904 | Oil & Gas Operator | May 2025 |
| 52 | Barbee, R.L. Operating, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | May 2025 |
| 53 | Barrett Brothers Oil & Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2020 |
| 54 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 55 | Baxter, Kelly H. Oil And Gas Co. | Austin, TX 78767 | Oil & Gas Operator | Nov 2010 |
| 56 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 57 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | May 2025 |
| 58 | BDR Energy Corporation | Corpus Chrsti, TX 78463 | Oil & Gas Operator | Mar 1998 |
| 59 | Beach Oil & Gas, Inc. | Lubbock, TX 79464 | Oil & Gas Operator | May 2025 |
| 60 | Beaver Oil & Gas Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 61 | Beckham Resources, Inc. | Houston, TX 77010 | Oil & Gas Operator | Mar 2011 |
| 62 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 63 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | May 2025 |
| 64 | Bellows, Dewey Oper. Co., LTD. | Refugio, TX 78377 | Oil & Gas Operator | Jul 2013 |
| 65 | Bep Operating, LLC | Pearland, TX 77581 | Oil & Gas Operator | May 2025 |
| 66 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 67 | Big "6" Drilling Company | Houston, TX 77063 | Oil & Gas Operator | Mar 2019 |
| 68 | Big Lake Corporation | Dallas, TX 75222 | Oil & Gas Operator | May 2025 |
| 69 | Billington Oil & Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 70 | Bishop, J. E., Inc. | Houston, TX 77024 | Oil & Gas Operator | Jul 2012 |
| 71 | Bison Energy Partners, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2001 |
| 72 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 73 | Black Belt Operating, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2025 |
| 74 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | May 2025 |
| 75 | Blue Wing Energy, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 76 | Bluebonnet Exploration Company | New Braunfels, TX 78130 | Oil & Gas Operator | Apr 2018 |
| 77 | Bob-Pat Oil & Gas Co., Inc. | Victoria, TX 77902 | Oil & Gas Operator | Jun 2002 |
| 78 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | May 2025 |
| 79 | Braman Working Interests LP | Victoria, TX 77902 | Oil & Gas Operator | Jun 2015 |
| 80 | Braman, D. H., Jr. | Victoria, TX 77901 | Oil & Gas Operator | Dec 2008 |
| 81 | Brayton Operating Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Sep 2009 |
| 82 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 83 | Bridas Energy USA, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Aug 2008 |
| 84 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 85 | Bridge Oil Production Co., Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 1993 |
| 86 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 87 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 88 | Brown, C. Douglas, LLC | Dallas, TX 75209 | Oil & Gas Operator | Dec 2005 |
| 89 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | May 2025 |
| 90 | Bull Oil Company, LLC | Livingston, TX 77351 | Oil & Gas Operator | May 2025 |
| 91 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 92 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | May 2025 |
| 93 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | May 2025 |
| 94 | C.C.O. & G. Company Inc. | Austin, TX 78765 | Oil & Gas Operator | Sep 1995 |
| 95 | C.W. Pickering, Inc. | Victoria, TX 77904 | Gas Operator | Sep 2022 |
| 96 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 97 | Cabot Oil & Gas Production Corp. | Houston, TX 77060 | Oil & Gas Operator | Jun 1996 |
| 98 | Cactus Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | May 2025 |
| 99 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 100 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |