| 1 | 20TH Century Pipe & Equip.Co.Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 2 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 3 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | May 2025 |
| 4 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 5 | Accell Natural Gas Company | Houston, TX 77042 | Oil & Gas Operator | Sep 1998 |
| 6 | Aeg Operating, LLC | Austin, TX 78746 | Oil Operator | Jun 2012 |
| 7 | Aghorn Operating, Inc. | Odessa, TX 79768 | Oil & Gas Operator | May 2025 |
| 8 | Ajax Resources, LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 9 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 10 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 11 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 12 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 13 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 14 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 15 | Amerind Oil Company, LTD. | Midland, TX 79701 | Oil & Gas Operator | Nov 2004 |
| 16 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 17 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 18 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 19 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 20 | Antelope Production Co. | Midland, TX 79701 | Oil & Gas Operator | Oct 1995 |
| 21 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 22 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 23 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 24 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 25 | Arkland Producing Co Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2023 |
| 26 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 27 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 28 | Arya Resources, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 29 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 30 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 31 | Athlon Energy Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 32 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 33 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 34 | Atlantic Oil Corporation | Denver, CO 80206 | Oil & Gas Operator | Dec 1982 |
| 35 | Atlas Energy Corporation (Del.) | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2025 |
| 36 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 37 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 38 | Baber, Bill M. | Petrolia, TX 76377 | Oil & Gas Operator | May 2025 |
| 39 | Bam Permian Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 40 | Barnett Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | May 2025 |
| 41 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | May 2025 |
| 42 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 43 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 44 | Bayridge Texas Corp. | Big Spring, TX 79720 | Oil & Gas Operator | Jul 2004 |
| 45 | Baytech Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 46 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 47 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 48 | Bear Creek Energy, LLC | Sealy, TX 77474 | Oil Operator | May 2025 |
| 49 | Bedrock Production, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 50 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 51 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | May 2025 |
| 52 | Berkshire Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 53 | Berry Oil Comp. | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 54 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 55 | Big Star Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2017 |
| 56 | Birch Operations, Inc. | Houston, TX 77010 | Oil & Gas Operator | May 2025 |
| 57 | Black Arrow Operating, LLC | Dennis, TX 76439 | Oil & Gas Operator | May 2025 |
| 58 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 59 | Black Swan Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2023 |
| 60 | Blair Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2011 |
| 61 | Blair, Jack N. | Midland, TX 79702 | Oil & Gas Operator | May 1996 |
| 62 | Bledsoe Partners, Inc. | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 1995 |
| 63 | Blue Ridge Resources, LLC | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 64 | Bommer Engineering Co. | San Antonio, TX 78260 | Oil & Gas Operator | May 2025 |
| 65 | Bosque Texas Oil LLC | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 66 | Boyd & McWilliams Energy Group | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 67 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 68 | Brady, W. Production, Inc. | Midland, TX 79708 | Oil & Gas Operator | May 2025 |
| 69 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 70 | Brammer Supply Inc | Gainesville, TX 76240 | Oil & Gas Operator | Nov 2014 |
| 71 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 72 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2025 |
| 73 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 74 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 75 | Brock, J. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 76 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | May 2025 |
| 77 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 78 | Brown, H. L., Jr. | Midland, TX 79702 | Oil & Gas Operator | May 2002 |
| 79 | Brown, H.L. Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 80 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 81 | Bulldog Operating Company | Artesia, NM 88211 | Oil & Gas Operator | Jan 2014 |
| 82 | Burleson Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 83 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 84 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 85 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 86 | Bustamante Oil Company | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 87 | Butler, Kevin O. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 88 | Butler, Kevin O. & Assoc., Inc. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 89 | Callaway Production Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 1996 |
| 90 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 91 | Cambrian Management LTD | McCaulley, TX 79534 | Oil & Gas Operator | May 2025 |
| 92 | Campana Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 93 | Capataz Operating Inc | Midland, TX 79702 | Oil & Gas Operator | Sep 2020 |
| 94 | Caprock Exploration, Inc. | Monahans, TX 79756 | Oil & Gas Operator | May 2025 |
| 95 | Caprock Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Dec 2007 |
| 96 | Carlow Corp. | Midland, TX 79702 | Oil & Gas Operator | Mar 2025 |
| 97 | Carr Well Service Inc | Odessa, TX 79769 | Oil & Gas Operator | Nov 1996 |
| 98 | Carrland Oil & Gas Inc. | Prosper, TX 75078 | Oil & Gas Operator | May 2025 |
| 99 | Cass Energy Corp | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 100 | Cazador Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |