| 1 | 3-L Drilling | Abilene, TX 79605 | Oil & Gas Operator | May 2025 |
| 2 | A.C.T. Operating Company | Lubbock, TX 79401 | Oil & Gas Operator | May 2025 |
| 3 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 4 | Alexander Royalty Company | Red Rock, TX 78662 | Oil Operator | May 2025 |
| 5 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 6 | American Star Energy & Min. Corp | Katy, TX 77449 | Oil & Gas Operator | May 2025 |
| 7 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 8 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 9 | Arben Oil, Inc. | Coleman, TX 76834 | Oil & Gas Operator | May 2025 |
| 10 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2025 |
| 11 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 12 | Asante Operating Company, LLC | Austin, TX 78703 | Oil Operator | May 2025 |
| 13 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | May 2025 |
| 14 | August Oil | Plano, TX 75093 | Oil & Gas Operator | Aug 2003 |
| 15 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | May 2025 |
| 16 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 17 | Avian Tech International, Inc. | Euless, TX 76040 | Oil & Gas Operator | Apr 1995 |
| 18 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | May 2025 |
| 19 | Bandera Petroleum, Inc. | Abilene, TX 79606 | Oil & Gas Operator | Nov 2018 |
| 20 | Bass Petroleum | Austin, TX 78720 | Oil & Gas Operator | Aug 2004 |
| 21 | Bass Petroleum Inc | Austin, TX 78716 | Oil & Gas Operator | May 2025 |
| 22 | Bastrop Energy Group | San Antonio, TX 78231 | Oil & Gas Operator | May 2025 |
| 23 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 24 | Bedford Oil & Gas, Inc. | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 25 | Big Lake Corporation | Dallas, TX 75222 | Oil & Gas Operator | May 2025 |
| 26 | Black Jack Services, L.L.C. | Bastrop, TX 78602 | Oil & Gas Operator | May 2025 |
| 27 | Blackmar, Jim Oil Operator | Luling, TX 78648 | Oil & Gas Operator | Jan 2021 |
| 28 | Bluebonnet Exploration Company | New Braunfels, TX 78130 | Oil & Gas Operator | Apr 2018 |
| 29 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 30 | Brittany Drilling Co. | Abilene, TX 79604 | Oil & Gas Operator | Dec 2000 |
| 31 | Brock Oil & Gas Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2019 |
| 32 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | May 2025 |
| 33 | Burke, Harry Petroleum | Houston, TX 77080 | Oil & Gas Operator | Nov 2024 |
| 34 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | May 2025 |
| 35 | C S J, Inc. | Austin, TX 78716 | Oil & Gas Operator | May 2025 |
| 36 | Cal-Tex Fossil, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 37 | Cap Operating Inc. | Borger, TX 79008 | Oil & Gas Operator | May 2025 |
| 38 | Carter E&P, LLC | Johnson City, TX 78636 | Oil & Gas Operator | Dec 2016 |
| 39 | Carter, Gertrude (Trudy) | Rockwall, TX 75032 | Oil & Gas Operator | Apr 2013 |
| 40 | Chalker Operating Inc. | Richmond, TX 77406 | Oil & Gas Operator | Jul 2016 |
| 41 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 42 | Chase Energy, Inc. | Austin, TX 78763 | Oil & Gas Operator | Oct 2001 |
| 43 | Cheatham, Joe R. Oil Co. | Lockhart, TX 78644 | Oil & Gas Operator | Dec 2018 |
| 44 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 45 | Chmelar, Eugene Oil & Gas | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 46 | Cibolo Energy Operating, Inc. | Bulverde, TX 78163 | Oil & Gas Operator | May 2025 |
| 47 | Coates Energy Trust | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2008 |
| 48 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 49 | Coho Resources Inc. | Dallas, TX 75240 | Oil & Gas Operator | Jul 2002 |
| 50 | Colt Operating Corporation | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 51 | Comet Oil & Gas, Inc. | Conroe, TX 77305 | Oil & Gas Operator | May 2025 |
| 52 | Comet Production | Conroe, TX 77305 | Oil Operator | May 2025 |
| 53 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 54 | Corum Production Company | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 55 | Creative Oil & Gas Operating,LLC | Giddings, TX 78942 | Oil & Gas Operator | May 2024 |
| 56 | Creative Oil And Gas Op II, LLC | San Antonio, TX 78246 | Oil Operator | May 2025 |
| 57 | Crescent Exploration Company | Austin, TX 78767 | Oil & Gas Operator | Aug 1995 |
| 58 | Crown Equipment Co. | Weatherford, TX 76086 | Oil & Gas Operator | May 2025 |
| 59 | Csa Exploration Company, Inc. | Houston, TX 77027 | Oil & Gas Operator | Aug 2003 |
| 60 | Cumming Company, Inc. The | Fort Worth, TX 76116 | Oil & Gas Operator | May 2025 |
| 61 | D-Mil Production Inc | Argyle, TX 76226 | Oil & Gas Operator | May 2025 |
| 62 | Daniels Corporation, The | Seabrook, TX 77586 | Oil & Gas Operator | May 2025 |
| 63 | DCP Operating Co LP | Houston, TX 77042 | Oil & Gas Operator | Feb 2025 |
| 64 | Digital Operating Company LLC | Boerne, TX 78006 | Oil & Gas Operator | May 2025 |
| 65 | Dirnett, Inc. | Tuleta, TX 78162 | Oil & Gas Operator | May 2025 |
| 66 | Discorbis Oil Company | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2019 |
| 67 | Diversity Petroleum, LP | Rockwall, TX 75087 | Oil & Gas Operator | Aug 2010 |
| 68 | Dynamic Petroleum Res., Inc. | Houston, TX 77068 | Oil & Gas Operator | Jul 1994 |
| 69 | E P C Oil & Gas, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | May 2025 |
| 70 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 71 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 72 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 73 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 74 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 75 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 76 | Ergon Energy Partners, L.P. | Monroe, LA 71207 | Oil & Gas Operator | Apr 2024 |
| 77 | Ernest Operating Company | Rockdale, TX 76567 | Oil & Gas Operator | May 2025 |
| 78 | Escondido Petroleum Company, Inc | Houston, TX 77063 | Oil & Gas Operator | May 2025 |
| 79 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 80 | Express Oil Co. | Hallettsville, TX 77964 | Oil & Gas Operator | May 2025 |
| 81 | Finger Oil & Gas, Inc. | Castroville, TX 78009 | Oil & Gas Operator | May 2021 |
| 82 | Foothill Energy, LLC | Spring, TX 77393 | Oil & Gas Operator | May 2025 |
| 83 | Four C Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 84 | Geo Co., Inc. | Austin, TX 78745 | Oil Operator | Apr 1988 |
| 85 | Geomeg Energy Operating Co., LLC | Aransas Pass, TX 78336 | Oil & Gas Operator | May 2025 |
| 86 | Geomeg Operating, LLC | Dripping SPGS, TX 78620 | Oil Operator | Nov 2010 |
| 87 | Geosouthern Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 88 | Ginco Operating Co. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 89 | Goldmark Energy Corporation | Spring, TX 77393 | Oil & Gas Operator | Jul 2010 |
| 90 | Great Plains Resources, Inc. | Nixon, TX 78140 | Oil & Gas Operator | May 2025 |
| 91 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | May 2025 |
| 92 | H - A Energy, Inc. | Midland, TX 79704 | Oil & Gas Operator | May 2025 |
| 93 | Hamman Oil & Refining Company | Houston, TX 77098 | Oil & Gas Operator | May 2025 |
| 94 | Hankamer, Curtis Corporation,The | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 95 | Harvey Brothers Oil & Gas | Corpus Chrsti, TX 78408 | Oil & Gas Operator | Jul 2004 |
| 96 | Hazelett Oil Company, Inc. | Dale, TX 78616 | Oil & Gas Operator | Sep 2005 |
| 97 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 98 | Hellums, Harold | Cedar Creek, TX 78612 | Oil & Gas Operator | Mar 2008 |
| 99 | Hess, Jerry Operating Co. | Muenster, TX 76252 | Oil & Gas Operator | May 2025 |
| 100 | Hollub Production Company | Seguin, TX 78156 | Oil & Gas Operator | Jul 2000 |