| 1 | 3-T Exploration, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Mar 2025 |
| 2 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 3 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 4 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 5 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 6 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 7 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 8 | Arrco Operating, LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2025 |
| 9 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 2025 |
| 10 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 11 | Aterra Exploration, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 12 | Barrett Brothers Oil And Gas | San Antonio, TX 78217 | Oil & Gas Operator | Mar 1995 |
| 13 | Baylor Operating, LLC | Austin, TX 78766 | Oil & Gas Operator | Mar 2025 |
| 14 | Bellows Operating Co., L. C. | Goliad, TX 77963 | Oil & Gas Operator | Mar 2025 |
| 15 | Beta Oil Corporation | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2025 |
| 16 | Big Shell Oil & Gas, Inc. | Taft, TX 78390 | Oil & Gas Operator | Mar 2025 |
| 17 | Billington Oil & Gas, Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2025 |
| 18 | Blackbrush O & G, Inc. | San Antonio, TX 78258 | Oil & Gas Operator | Apr 2012 |
| 19 | Blackbrush O & G, LLC | San Antonio, TX 78259 | Oil & Gas Operator | Mar 2025 |
| 20 | Blue Star Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 21 | Botasch Operating, LLC | Dilley, TX 78017 | Oil & Gas Operator | Mar 2025 |
| 22 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 23 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 24 | Brooks, E. B., Jr. | Dallas, TX 75206 | Oil & Gas Operator | May 2018 |
| 25 | Brown, John Oil Co. | Eagle Pass, TX 78852 | Oil & Gas Operator | Mar 2025 |
| 26 | Bruington Operating, L.L.C. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2015 |
| 27 | Camelot Oil And Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 28 | Central Mineral Operating Co,Inc | San Antonio, TX 78216 | Oil & Gas Operator | Apr 1997 |
| 29 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 30 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 31 | Cheyenne Minerals, Inc. | Houston, TX 77030 | Oil & Gas Operator | Jun 2001 |
| 32 | Chittim Operating LLC | Houston, TX 77079 | Oil & Gas Operator | Mar 2025 |
| 33 | Clark, John M. | Midland, TX 79701 | Oil & Gas Operator | Dec 1993 |
| 34 | CML Exploration, LLC | Austin, TX 78746 | Oil & Gas Operator | Mar 2025 |
| 35 | CMR Energy, L.P. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 36 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2025 |
| 37 | Comanche Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2006 |
| 38 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 39 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 40 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 41 | Conway Energy Oper Services Inc. | San Diego, TX 78384 | Oil & Gas Operator | Mar 2025 |
| 42 | Cornerstone E & P Company LP | Irving, TX 75038 | Oil & Gas Operator | Nov 2010 |
| 43 | Dao Oil And Gas | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Mar 2025 |
| 44 | Dolphin Petroleum | Alice, TX 78333 | Oil & Gas Operator | Jun 2008 |
| 45 | Dolphin Petroleum, LP | Alice, TX 78333 | Oil & Gas Operator | Mar 2025 |
| 46 | Dynamic Production, Inc. | Fort Worth, TX 76106 | Oil & Gas Operator | Mar 2025 |
| 47 | Edco Energy, Inc. | Austin, TX 78738 | Oil & Gas Operator | May 2003 |
| 48 | El Indio Energy LLC | Austin, TX 78746 | Oil Operator | Mar 2025 |
| 49 | El Toro Resources LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 50 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 51 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 52 | Enre Corp. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2005 |
| 53 | Enron Oil & Gas Company | Houston, TX 77210 | Oil & Gas Operator | Dec 1999 |
| 54 | Esco Oil Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 55 | Espada Operating LLC | San Antonio, TX 78209 | Oil Operator | Mar 2025 |
| 56 | Et Gathering & Processing LLC | Dallas, TX 75225 | Oil Operator | Dec 2024 |
| 57 | European-Southwest Co. | Houston, TX 77254 | Oil & Gas Operator | Mar 2025 |
| 58 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 59 | Exploration Company, The | San Antonio, TX 78258 | Oil & Gas Operator | Jun 2010 |
| 60 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 61 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 62 | Field Petroleum Corp. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 63 | Flint Interests, LLC | Houston, TX 77057 | Oil & Gas Operator | Mar 2025 |
| 64 | Flying W Resources, LLC | Midland, TX 79701 | Oil & Gas Operator | Mar 2025 |
| 65 | Garza Oil & Gas LLC | Quemado, TX 78877 | Oil Operator | Mar 2025 |
| 66 | Gas Resources, Inc. | Southern Pine, NC 28387 | Oil & Gas Operator | Mar 2004 |
| 67 | Gasper Rice Resources, LTD. | Houston, TX 77068 | Oil & Gas Operator | Mar 2025 |
| 68 | Gei Management Co., Inc. | Houston, TX 77024 | Oil & Gas Operator | Sep 1993 |
| 69 | Genesis Producing Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2007 |
| 70 | GLG Energy LP | Austin, TX 78701 | Oil & Gas Operator | Jun 1994 |
| 71 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 72 | Grit Oil & Gas Management, LLC | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 73 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 74 | H & M Resources LLC | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 75 | Hawn Brothers | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2003 |
| 76 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 77 | Hollimon Oil Corporation | Castroville, TX 78009 | Oil & Gas Operator | Nov 2016 |
| 78 | Hopkins Engineering, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 1996 |
| 79 | Horizon Energy | Vergas, MN 56587 | Oil & Gas Operator | Mar 2025 |
| 80 | Houghton Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2009 |
| 81 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 82 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Mar 2025 |
| 83 | Hulsey Oil Company | Dallas, TX 75205 | Oil & Gas Operator | Aug 1999 |
| 84 | Iwt Energy Partners LLC | Austin, TX 78731 | Oil Operator | Mar 2025 |
| 85 | J-W Operating Company | Christoval, TX 76935 | Oil & Gas Operator | Mar 2025 |
| 86 | Javelin Energy Partners Management, LLC | Irving, TX 75038 | Oil & Gas Operator | Mar 2025 |
| 87 | Joint Resources Company | Fort Worth, TX 76107 | Oil & Gas Operator | Mar 2025 |
| 88 | K.M.A. Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 89 | Kathler Oil Interests | Frisco, TX 75034 | Oil & Gas Operator | Mar 2025 |
| 90 | KP Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1997 |
| 91 | Kremco Oil LLC | Wichita Falls, TX 76308 | Oil Operator | Mar 2025 |
| 92 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil Operator | Mar 2025 |
| 93 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 94 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 95 | Metis Energy LLC | Friendswood, TX 77546 | Oil & Gas Operator | Mar 2025 |
| 96 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Mar 2025 |
| 97 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 98 | More Texas Oil | Von Ormy, TX 78073 | Oil & Gas Operator | Mar 2025 |
| 99 | Morrow Resources, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2004 |
| 100 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |