| 1 | Aberdeen Petroleum (USA) Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1994 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Jul 2025 |
| 3 | Ace Productions | Beaumont, TX 77707 | Oil & Gas Operator | Jul 2025 |
| 4 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Jul 2025 |
| 5 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 6 | Ada Belle Oil & Gas Company | Sourlake, TX 77659 | Oil Operator | Dec 2023 |
| 7 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 8 | Addison Oil, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2013 |
| 9 | Adobe Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2004 |
| 10 | Advantagewon Oil, Us, Corp. | Batson, TX 77519 | Oil Operator | Dec 2019 |
| 11 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Jul 2025 |
| 12 | Allied-Gulf Energy, LLC | Lafayette, LA 70508 | Oil & Gas Operator | Jul 2025 |
| 13 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 14 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Jul 2025 |
| 15 | American Cascade Energy, Inc. | Barker, TX 77413 | Oil & Gas Operator | Jul 2025 |
| 16 | American Energy Sources, Inc. | Spring, TX 77388 | Oil & Gas Operator | Dec 2008 |
| 17 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 18 | Anderson Petro-Equipment, Inc. | Montgomery, TX 77356 | Oil & Gas Operator | Jul 2025 |
| 19 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 20 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jul 2025 |
| 21 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 22 | Arco Oil & Gas Co.-Silsbee | Lafayette, LA 70505 | Oil & Gas Operator | Jul 1993 |
| 23 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 24 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 25 | Arista Novelty, Inc. | Houston, TX 77256 | Oil & Gas Operator | Feb 1995 |
| 26 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 27 | Arrowhead Operating Inc. | Argyle, TX 76226 | Oil & Gas Operator | Jul 2025 |
| 28 | Atco Prod. Co., Inc. | Winnie, TX 77665 | Oil & Gas Operator | Nov 2020 |
| 29 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 30 | Auden Oil Inc. | Hardin, TX 77561 | Oil Operator | Jul 2025 |
| 31 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 32 | Batson Ent Ventures L.L.C. | Batson, TX 77519 | Oil Operator | Jul 2025 |
| 33 | Baxter, Kelly H. | Austin, TX 78767 | Oil & Gas Operator | Mar 2008 |
| 34 | Beckham Resources, Inc. | Houston, TX 77010 | Oil & Gas Operator | Mar 2011 |
| 35 | Bet-Ro, Inc. | Rockdale, TX 76567 | Oil & Gas Operator | Jul 2025 |
| 36 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 37 | BHB Operating Inc. | Fort Worth, TX 76137 | Oil & Gas Operator | Jul 2025 |
| 38 | Black Belt Operating, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jul 2025 |
| 39 | Black Creek Production Co., Inc. | Driftwood, TX 78619 | Oil & Gas Operator | Feb 2000 |
| 40 | Black Stone Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2004 |
| 41 | Black Stone Energy Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 42 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Jul 2025 |
| 43 | BLS Resources, Inc. | Rosharon, TX 77583 | Oil & Gas Operator | Feb 2001 |
| 44 | Blue Owl Energy LLC | Canada, 00100 | Oil Operator | Jul 2025 |
| 45 | Bock & Bacon, Inc. | Houston, TX 77098 | Oil & Gas Operator | May 1999 |
| 46 | Boothe Oil Company | Batson, TX 77519 | Oil & Gas Operator | Feb 2014 |
| 47 | Bowman, Fred Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2014 |
| 48 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 49 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2025 |
| 50 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jul 2025 |
| 51 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Apr 2025 |
| 52 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 53 | Brown, Al A. | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 54 | Brown, Buddy | Livingston, TX 77351 | Oil & Gas Operator | Jul 2025 |
| 55 | Brown, C. L. Inc. | Corsicana, TX 75110 | Oil & Gas Operator | Dec 1999 |
| 56 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 57 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | Jul 2025 |
| 58 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | Jul 2025 |
| 59 | C.F.O., Inc. | Liberty, TX 77575 | Oil Operator | Jul 2025 |
| 60 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jul 2025 |
| 61 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | Jul 2025 |
| 62 | Camden Resources, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Apr 2008 |
| 63 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 64 | Capco Offshore Of Texas, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 65 | Carbon Oil Inc | Vidor, TX 77670 | Oil & Gas Operator | Jul 2025 |
| 66 | Carpenter Corporation | Sourlake, TX 77659 | Oil & Gas Operator | Oct 1994 |
| 67 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 68 | Caskids Operating Company | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 69 | Caspen Operating Company | Somerset, TX 78069 | Oil & Gas Operator | Mar 2008 |
| 70 | Cavalier Oil & Gas, Inc. | Buchanan Dam, TX 78609 | Oil & Gas Operator | Jul 2025 |
| 71 | CCT & Co. | Tucson, AZ 85704 | Oil & Gas Operator | Jan 1996 |
| 72 | Century Exploration Houston, Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2011 |
| 73 | Century Exploration Houston, LLC | Austin, TX 78702 | Oil & Gas Operator | Jan 2016 |
| 74 | Century Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jul 2025 |
| 75 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2018 |
| 76 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 77 | Chenango Oil And Gas Co. | Groves, TX 77619 | Oil & Gas Operator | Jul 2025 |
| 78 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 79 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 80 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | Jul 2025 |
| 81 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 82 | Chroma Operating, Inc. | Washington, DC 20036 | Oil & Gas Operator | Jun 2016 |
| 83 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 84 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 85 | Cimarron Engineering Corp. | Kingsville, TX 78364 | Oil & Gas Operator | May 2015 |
| 86 | Cimarron Engineering, LLC | Kingsville, TX 78364 | Oil & Gas Operator | Jul 2025 |
| 87 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jul 2025 |
| 88 | Clover Production Company | Sourlake, TX 77659 | Oil & Gas Operator | Jul 2025 |
| 89 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 90 | Cole, Frank W Engineering | Dallas, TX 75254 | Oil & Gas Operator | Mar 2006 |
| 91 | Comanche Oil And Gas Company | Brownwood, TX 76801 | Oil & Gas Operator | Jul 2025 |
| 92 | Comanche Well Service Corp. | Plano, TX 75093 | Oil & Gas Operator | Jul 2025 |
| 93 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | Jul 2025 |
| 94 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 95 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 96 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 97 | Corona Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 98 | Corona Operating, LLC | Midland, TX 79702 | Oil Operator | Jul 2025 |
| 99 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 100 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |