| 1 | 3-T Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 2 | A.D.A. Oil Co | Iowa Park, TX 76367 | Oil Operator | Aug 2003 |
| 3 | Acacia Operating, LLC | | Oil & Gas Operator | Feb 2025 |
| 4 | Ace Energy LLC | Leawood, KS 66211 | Oil & Gas Operator | Feb 2025 |
| 5 | Achilles Oil, LLC | | Oil & Gas Operator | Feb 2025 |
| 6 | Ad Astra Resources LLC | Wichita, KS 67212 | Oil & Gas Operator | Mar 2025 |
| 7 | Ada Oil Exploration Corp | | Oil & Gas Operator | Jan 1986 |
| 8 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 9 | Adco Producing Company | | Oil & Gas Operator | Mar 1989 |
| 10 | Ainsworth, Otis | | Oil & Gas Operator | Jun 1987 |
| 11 | Alamosa Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 12 | Albert E. Smith Oil | | Oil Operator | Feb 2025 |
| 13 | Aldridge Operating Co., LLC | | Oil & Gas Operator | Aug 2019 |
| 14 | Alex Oil Co. | | Oil Operator | Jun 1996 |
| 15 | Allen Operating Company, LLC | | Oil & Gas Operator | Dec 2022 |
| 16 | Allstar Oil And Gas Inc. | | Oil & Gas Operator | Nov 1992 |
| 17 | Alpine Gas Operator, LLC | | Oil & Gas Operator | Jun 2024 |
| 18 | Alpine Well Service Inc | | Oil & Gas Operator | Dec 2023 |
| 19 | Amax Petroluem Corp. | | Oil & Gas Operator | Nov 1983 |
| 20 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 21 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 22 | American Quasar Petroleum Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2014 |
| 23 | American Southwest Corp. | | Oil & Gas Operator | Dec 1989 |
| 24 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 25 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 26 | Anderson Oil Company | Burkburnett, TX 76354 | Oil & Gas Operator | Dec 2015 |
| 27 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 28 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2025 |
| 29 | Aria Operating LLC | | Oil Operator | Feb 2025 |
| 30 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 31 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 32 | Australis TMS Inc. | | Oil & Gas Operator | Feb 2025 |
| 33 | Avad Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 34 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 35 | B & B Oil Well Service Company, Inc | | Oil Operator | Aug 1988 |
| 36 | B & M Resources, Inc. | | Oil Operator | Apr 1997 |
| 37 | B & W Exploration, Inc. | | Oil & Gas Operator | Dec 2000 |
| 38 | B. H. T. Production, LLC | | Oil & Gas Operator | Apr 2010 |
| 39 | Bailey, S. H. | | Oil & Gas Operator | Jul 1995 |
| 40 | Barnhart Co LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 41 | Barnhart Co. | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 42 | Barton Oil, LLC | | Oil & Gas Operator | Jan 2014 |
| 43 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 44 | Bay Gas, LLC | | Oil & Gas Operator | Mar 2025 |
| 45 | Bean Resources, Inc. | | Oil & Gas Operator | Aug 2006 |
| 46 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 47 | Beaver Operating Company, LLC | | Oil & Gas Operator | Oct 2024 |
| 48 | Belden & Blake | | Oil & Gas Operator | Feb 1988 |
| 49 | Belle Oil, Inc. | | Oil & Gas Operator | Mar 2025 |
| 50 | Betsy Production Company, Inc. | Magnolia, AR 71753 | Oil & Gas Operator | Mar 2025 |
| 51 | Big Joe Operating Company, Inc. | | Oil & Gas Operator | May 2017 |
| 52 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 53 | Biglane Operating Company | | Oil & Gas Operator | Mar 2025 |
| 54 | Black Gold Production Company | | Oil & Gas Operator | Feb 1998 |
| 55 | Black Horse Resources, LLC | Oklahoma City, OK 73112 | Oil & Gas Operator | Sep 2024 |
| 56 | Black Jack Oil Co Inc | Holliday, TX 76366 | Oil & Gas Operator | Feb 2025 |
| 57 | Black Snake Petroleum, LLC | | Oil & Gas Operator | Oct 2024 |
| 58 | Blackburn Operating Co., Inc. | | Oil & Gas Operator | Jun 2008 |
| 59 | Blue Valley Petroleum, LTD. | | Oil Operator | Jun 1991 |
| 60 | Bluff City Pipe & Supply Co. | | Oil Operator | Jan 1987 |
| 61 | Bob Bertolet Et Al | | Oil Operator | Jul 1992 |
| 62 | Bogue Homa Oil Production LLC | | Oil & Gas Operator | Mar 2025 |
| 63 | BPS Operating Services LLC | | Oil Operator | Jan 2005 |
| 64 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 65 | Breland, Leon | | Oil & Gas Operator | Feb 1991 |
| 66 | Briggs Operating Company | | Oil & Gas Operator | Nov 1998 |
| 67 | Brown, Edward L. | | Oil Operator | Sep 1980 |
| 68 | Browning & Welch, Inc. | | Oil & Gas Operator | Mar 2005 |
| 69 | Bruxoil Inc | | Oil & Gas Operator | Feb 2025 |
| 70 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 71 | Bulldog Operating Company LLC | Shreveport, LA 71101-3680 | Oil & Gas Operator | Jun 2015 |
| 72 | Burnsed Oil Co., Inc. | | Oil & Gas Operator | Mar 2025 |
| 73 | Caledonia Energy Partners, LLC | | Oil & Gas Operator | Mar 2007 |
| 74 | Callon Oil Co, Cambell | | Oil & Gas Operator | Oct 1984 |
| 75 | Callon Petroleum Company | Natchez, MS 39120 | Oil & Gas Operator | Jan 2000 |
| 76 | Calto Operating Company, Inc. | Dallas, TX 75225 | Oil & Gas Operator | May 2004 |
| 77 | Campbell Co. Et Al | | Oil Operator | Apr 1986 |
| 78 | Cardneaux Inc. | | Oil & Gas Operator | Aug 2009 |
| 79 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 80 | Castor Exploration, Inc. | | Oil & Gas Operator | Dec 1991 |
| 81 | Cavalier Oil Co. Et Al | | Oil Operator | Jan 1986 |
| 82 | Cavins Oilfield Services, LLC. | | Oil Operator | Apr 2006 |
| 83 | CCM Enterprises, Inc | | Oil & Gas Operator | Oct 1985 |
| 84 | Cedar Grove Energy Corp. | | Oil Operator | Sep 2009 |
| 85 | Centerpoint Water Disposal Inc | | Oil & Gas Operator | Aug 1984 |
| 86 | Central Operating, LLC | | Oil & Gas Operator | Feb 2025 |
| 87 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 88 | Century Exploration New Orleans, LLC | | Oil & Gas Operator | Mar 2008 |
| 89 | Ceo Operating, Co. | | Oil & Gas Operator | Dec 1999 |
| 90 | Chase Oil & Gas Inc C-O Triad | | Oil & Gas Operator | Mar 1993 |
| 91 | Chevron U. S. A., Inc. -Ca | | Oil & Gas Operator | Jan 2000 |
| 92 | Chevron U. S. A., Inc. -TX | | Oil & Gas Operator | Dec 2004 |
| 93 | Cheyenne Minerals, Inc. | Houston, TX 77030 | Oil & Gas Operator | Jun 2001 |
| 94 | Christian Well Service | | Oil & Gas Operator | May 1987 |
| 95 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 96 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 97 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 98 | Clark, Donald-Roger Young | | Oil & Gas Operator | Jan 1988 |
| 99 | Clark, Noel D. Et Al | | Oil & Gas Operator | Mar 1994 |
| 100 | Clarkco Services, Inc. | | Oil & Gas Operator | Sep 2024 |