| 1 | A N R Pipeline Co | | Oil & Gas Operator | Jan 2025 |
| 2 | A. L. Coon | | Oil Operator | May 1979 |
| 3 | A. W. Sour, Jr. | | Oil Operator | Mar 2003 |
| 4 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2025 |
| 5 | Addie, James & John Thornton | | Oil & Gas Operator | Dec 2024 |
| 6 | Ainsworth Rig Service, LLC | | Oil Operator | Nov 2024 |
| 7 | Alameda Oil Company | | Oil Operator | Mar 1998 |
| 8 | Alpine Well Service, Inc. | | Oil & Gas Operator | Dec 2023 |
| 9 | American Casing Crews, Inc. | | Oil Operator | Dec 1979 |
| 10 | Apollo Petroleum Corporation | | Oil & Gas Operator | Dec 2012 |
| 11 | Aracca Petroleum Company | | Oil Operator | May 1984 |
| 12 | Aracca Petroleum Corporation | | Oil Operator | Dec 1987 |
| 13 | Arbor Petroleum Corporation | Oklahoma City, OK 73102-4003 | Oil & Gas Operator | Mar 2011 |
| 14 | Array Operating, LLC | | Oil & Gas Operator | Mar 2017 |
| 15 | Atkins Production | | Oil Operator | Dec 2008 |
| 16 | Atlanta Exploration Co. | | Oil & Gas Operator | Oct 2001 |
| 17 | Australis TMS Inc. | | Oil & Gas Operator | Nov 2025 |
| 18 | Axis Onshore, LLC | | Oil & Gas Operator | Apr 2008 |
| 19 | Axis Onshore, LP | | Oil & Gas Operator | Dec 2010 |
| 20 | B & K Operating Co., Inc. | | Oil Operator | Mar 2000 |
| 21 | B & S Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Oct 2025 |
| 22 | B E Enterprises, Inc | | Oil Operator | Dec 2024 |
| 23 | B L S W Pleasure Corp., Inc | | Oil Operator | Mar 1990 |
| 24 | B&B Oil Rental Tools, Inc. | | Oil Operator | Sep 1994 |
| 25 | B. G. Denton | | Oil & Gas Operator | Dec 2023 |
| 26 | B. J. Long | | Oil & Gas Operator | Nov 1989 |
| 27 | Barron Utilities, Inc. | | Oil Operator | Jun 1999 |
| 28 | Baxter Drill. & Explor., Inc. | | Oil Operator | Jun 1997 |
| 29 | Beard And Ganey | | Oil & Gas Operator | Oct 1986 |
| 30 | Bech Oil & Gas, Inc. | | Oil & Gas Operator | Mar 1994 |
| 31 | Belle Exploration, Inc. | | Oil & Gas Operator | Jun 2021 |
| 32 | Bert & Glen Loe | | Oil Operator | Jul 1979 |
| 33 | Big G Exploration, Inc. | | Oil Operator | Mar 1988 |
| 34 | Billingsley Engineering Co. | | Oil & Gas Operator | May 1994 |
| 35 | Billy A. Poisso | | Oil & Gas Operator | Apr 2023 |
| 36 | BJT Properties Of Lasalle, LLC | | Oil Operator | Dec 2024 |
| 37 | Bodcaw Company | | Oil & Gas Operator | Oct 1979 |
| 38 | Brewton And Martin | | Oil Operator | Dec 1997 |
| 39 | C & F Oil Company, Inc. | | Oil Operator | Jan 2025 |
| 40 | C & R Oil | | Oil Operator | Sep 2025 |
| 41 | C.T.R. Oil, Inc. | | Oil & Gas Operator | Jan 2025 |
| 42 | Campground Corporation | | Oil Operator | Nov 2023 |
| 43 | Candleridge Oil, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2003 |
| 44 | Cardinal Petroleum Corp Of La | | Oil Operator | May 2003 |
| 45 | Caroline Hunt Trust Estate | | Oil & Gas Operator | Mar 1987 |
| 46 | Castor Production, L.L.C. | | Oil Operator | Dec 2024 |
| 47 | Cavalcade Operating Company LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2017 |
| 48 | Cavenham Energy Resources Inc. | | Oil & Gas Operator | Apr 1991 |
| 49 | Cavenham Forest Ind., Inc. | | Oil & Gas Operator | Nov 1987 |
| 50 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Jul 2025 |
| 51 | Cedar Creek Consulting Inc | | Oil Operator | Jan 2025 |
| 52 | Cenla Oil Company, LLC | | Oil Operator | Dec 2024 |
| 53 | Chadco, Inc. | | Oil Operator | Dec 2024 |
| 54 | Channel Exploration Company | | Oil & Gas Operator | Feb 1997 |
| 55 | Charles B. Bice | | Oil & Gas Operator | Jul 1983 |
| 56 | Charlie G. James | | Gas Operator | Jul 1989 |
| 57 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 58 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 59 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 60 | Consolidated Energy Res., Inc. | | Oil Operator | Jun 1992 |
| 61 | Coquina Oil Corporation | Houston, TX 77227 | Oil & Gas Operator | Mar 2015 |
| 62 | Cross Development Co. | | Oil Operator | Dec 1989 |
| 63 | Cross Development-MMHS PRTSHP. | | Oil Operator | May 1987 |
| 64 | Cross Development1984-1 PRTSHP | | Oil & Gas Operator | Sep 1990 |
| 65 | Crossroads Energy Development, LLC | | Oil Operator | Mar 2018 |
| 66 | Crosstex Treating Services, L.P. | | Oil Operator | Sep 2009 |
| 67 | Crown Zellerbach | | Oil & Gas Operator | May 1986 |
| 68 | CSC, Inc. | | Oil Operator | Jan 2000 |
| 69 | Curtis Beard & Huston P. Ganey | | Oil Operator | Mar 1987 |
| 70 | D & L Partnership | Rhome, TX 76078 | Oil Operator | May 1987 |
| 71 | D & T Company | | Oil & Gas Operator | Jun 1983 |
| 72 | D J Production | Pasadena, TX 77502 | Oil & Gas Operator | Mar 2025 |
| 73 | D. A. Milton | | Oil & Gas Operator | Dec 2016 |
| 74 | David Crow | | Oil & Gas Operator | Nov 1985 |
| 75 | David New Operating Co. Inc. | | Oil & Gas Operator | Feb 1999 |
| 76 | Davis & Kaiser Operating, Inc. | | Oil Operator | May 2004 |
| 77 | Day Town Operating, LLC | | Oil & Gas Operator | Jan 2025 |
| 78 | Deco | Kilgore, TX 75662 | Oil & Gas Operator | Jan 1999 |
| 79 | Deco Oil Co. | | Oil Operator | Oct 2013 |
| 80 | Delta Operating Company | | Oil Operator | Mar 1987 |
| 81 | Delta Petroleum Inc | Houston, TX 77269-1007 | Oil & Gas Operator | May 2009 |
| 82 | Domestic Energy Corporation | | Oil Operator | Jan 1988 |
| 83 | Domestic Oil Producers,Inc. | | Oil Operator | Oct 1998 |
| 84 | Don G. Wiley, Jr. | | Oil Operator | Dec 1979 |
| 85 | Donnie R. Morrow | | Oil Operator | Dec 2024 |
| 86 | Doran And Braddock | | Oil & Gas Operator | Nov 1984 |
| 87 | E. P. Alexander | | Oil Operator | Jan 1984 |
| 88 | E. P. Alexander, Et Al | | Oil Operator | Jan 1984 |
| 89 | Eddie Mayo | | Oil Operator | Jun 2006 |
| 90 | Elfco, Inc. | College Sta, TX 77845 | Oil & Gas Operator | Jun 1996 |
| 91 | Emerge Operating, LLC | | Oil & Gas Operator | Oct 2025 |
| 92 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 93 | Endurance Operating LLC | | Oil & Gas Operator | Dec 2024 |
| 94 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Oct 2025 |
| 95 | Enerquest Oil & Gas LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2025 |
| 96 | Est. Of H. L. Hunt | | Oil & Gas Operator | Jun 1983 |
| 97 | Ethyl Properties Inc | | Oil & Gas Operator | Aug 1989 |
| 98 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 99 | Fair Oil Company | Tyler, TX 75710 | Oil & Gas Operator | Dec 2000 |
| 100 | Far West Development, LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |