| 1 | 20TH Century Pipe & Equip.Co.Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 2 | 3-M Energy Corporation | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2017 |
| 3 | 7S Oil & Gas, LLC | Midland, TX 79706 | Oil & Gas Operator | Dec 2019 |
| 4 | Abarta Oil & Gas Co., Inc. | Pittsburgh, PA 15238 | Oil & Gas Operator | Dec 2020 |
| 5 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 6 | Adventure Exploration PTRS, LLC | Midland, TX 79702 | Oil & Gas Operator | Aug 2012 |
| 7 | Adventure Operating Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Jan 2021 |
| 8 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 9 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | May 2025 |
| 10 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 11 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 12 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 13 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 14 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 15 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 16 | Alvarado 2014 LLC | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 17 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 18 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 19 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 20 | American Energy-Perm Basin, LLC | Oklahoma City, OK 73113 | Oil & Gas Operator | May 2016 |
| 21 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 22 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 23 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 24 | Anadarko Petroleum Co | Houston, TX 77227 | Oil & Gas Operator | Feb 1998 |
| 25 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 26 | Anegada Resources | Kerrville, TX 78029 | Oil & Gas Operator | Jan 2002 |
| 27 | Angle Oil Company | Hays, KS 67601 | Oil Operator | Sep 2002 |
| 28 | Anthony, Bob G. Inc. | Brookhaven, MS 39601 | Oil & Gas Operator | May 2025 |
| 29 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 30 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 31 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 32 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 33 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 34 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 35 | Area Pipe And Equipment | Midland, TX 79702 | Oil & Gas Operator | Apr 2003 |
| 36 | Arkland Producing Co Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2023 |
| 37 | Arkland, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 1994 |
| 38 | Arnot, W. G., Jr. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2017 |
| 39 | Athlon Fe Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2015 |
| 40 | Athlon Holdings LP | Denver, CO 80202 | Oil & Gas Operator | Jan 2015 |
| 41 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 42 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | May 2025 |
| 43 | B.P. Oil Company | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 44 | Bam Permian Operating, LLC | Midland, TX 79707 | Oil & Gas Operator | May 2025 |
| 45 | Banam Corporation | Midland, TX 79702 | Oil & Gas Operator | Nov 2013 |
| 46 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 47 | Baron Energy Inc. | San Marcos, TX 78666 | Oil & Gas Operator | May 2025 |
| 48 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 49 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 50 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | May 2025 |
| 51 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 52 | Baylor Operating, LLC | Austin, TX 78766 | Oil & Gas Operator | May 2025 |
| 53 | Baytech Inc | Midland, TX 79702 | Oil & Gas Operator | Aug 2003 |
| 54 | BC Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 55 | BCP Resources, LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 56 | Beach Exploration, Inc. | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 57 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 58 | Berry Oil Comp. | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 59 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 60 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 61 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 62 | Big Lake J J Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | May 2025 |
| 63 | Big Star Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Sep 2017 |
| 64 | Bills, L. T. | Snyder, TX 79549 | Oil & Gas Operator | May 2025 |
| 65 | Bird E&P LLC | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 66 | Bird, Charles A. | Midland, TX 79701 | Oil & Gas Operator | Feb 2012 |
| 67 | Bishop, D. L. | Midland, TX 79702 | Oil & Gas Operator | Mar 2012 |
| 68 | Black Arrow Operating, LLC | Dennis, TX 76439 | Oil & Gas Operator | May 2025 |
| 69 | Black Gold Energy LLC | Jenks, OK 74037 | Oil Operator | Jun 2024 |
| 70 | Black Mountain SWD LP | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 71 | Black Resources, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Mar 2008 |
| 72 | Black Swan Opco, LLC | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 73 | Blanco Oil Co. | San Antonio, TX 78230 | Oil & Gas Operator | Feb 2004 |
| 74 | Bledsoe Partners, Inc. | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 1995 |
| 75 | Blue Star Natural Resources, LLC | San Angelo, TX 76906 | Oil & Gas Operator | May 2025 |
| 76 | Bluestem Energy Holdings, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2015 |
| 77 | Boaz Energy II Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 78 | Bodark Oil Company | Ozona, TX 76943 | Oil & Gas Operator | Jul 2009 |
| 79 | Bold Operating, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2019 |
| 80 | Bomar Operating Co., LC | Bellaire, TX 77401 | Oil & Gas Operator | May 2025 |
| 81 | Boyd & McWilliams Energy Group | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 82 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 83 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | May 2025 |
| 84 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 85 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2025 |
| 86 | Bridwell Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 87 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 88 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 89 | Broad Oak Energy, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Jul 2011 |
| 90 | Broman Oil & Gas LP | Fort Worth, TX 76102 | Oil & Gas Operator | May 2017 |
| 91 | Brothers Production Company Inc. | Midland, TX 79708 | Oil & Gas Operator | May 2025 |
| 92 | Brotherton Production Co. | Spokane, WA 99216 | Oil & Gas Operator | May 2025 |
| 93 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 94 | Brower, Robert C. | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 95 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 96 | Brown, H. L., Jr. | Midland, TX 79702 | Oil & Gas Operator | May 2002 |
| 97 | Brown, H.L. Operating, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 98 | BRP Energy, LLC | San Angelo, TX 76902 | Oil & Gas Operator | May 2025 |
| 99 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 100 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |