| 1 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 2 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 3 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 4 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 5 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 6 | Arcadia Energy Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 7 | Arco Oil & Gas Co.-Silsbee | Lafayette, LA 70505 | Oil & Gas Operator | Jul 1993 |
| 8 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 9 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | May 2025 |
| 10 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 11 | Aviara Energy Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2002 |
| 12 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 13 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 14 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 15 | BBX Operating, L.L.C. | Austin, TX 78738 | Oil & Gas Operator | May 2025 |
| 16 | Bechtel Energy Resources Corp. | Houston, TX 77210 | Oil & Gas Operator | Jun 1996 |
| 17 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 18 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | May 2025 |
| 19 | Block T Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 20 | Blue Ridge Group, Inc. | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2023 |
| 21 | Booher Engineering, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 22 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 23 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | May 2025 |
| 24 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 25 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 26 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | May 2025 |
| 27 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 28 | C & E Operating, Inc. | Hockley, TX 77447 | Oil & Gas Operator | May 2025 |
| 29 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 30 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 31 | Carbon Oil Inc | Vidor, TX 77670 | Oil & Gas Operator | May 2025 |
| 32 | Century Exploration Houston, Inc | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2011 |
| 33 | Century Exploration Houston, LLC | Austin, TX 78702 | Oil & Gas Operator | Jan 2016 |
| 34 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 35 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2025 |
| 36 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jan 2025 |
| 37 | Choctaw Resources, Inc. | Aledo, TX 76008 | Oil & Gas Operator | Dec 2019 |
| 38 | Choice Exploration, Inc. | Irving, TX 75063 | Oil & Gas Operator | May 2025 |
| 39 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 40 | Cleveland Production Company | Summit, MS 39666 | Oil & Gas Operator | Jul 1999 |
| 41 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 42 | Cody Energy, Inc. | Houston, TX 77077 | Oil & Gas Operator | Mar 2025 |
| 43 | Columbia Gas Development Corp. | Houston, TX 77251 | Oil & Gas Operator | Jun 1996 |
| 44 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 45 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 46 | Costa Energy, LLC | Irving, TX 75063 | Oil & Gas Operator | May 2025 |
| 47 | Crest Resources & Expl. Corp. | Houston, TX 77079 | Oil & Gas Operator | Dec 1998 |
| 48 | Creston Petroleum Corp. | Dallas, TX 75380 | Oil & Gas Operator | May 2025 |
| 49 | Dartex Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | May 2025 |
| 50 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 51 | Davis Southern Operating Co LLC | Houston, TX 77004 | Oil & Gas Operator | May 2025 |
| 52 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | May 2025 |
| 53 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 54 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | May 2025 |
| 55 | Doggy Oil Corp | Decatur, GA 30031 | Oil & Gas Operator | May 2025 |
| 56 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 57 | Dorado Oil Company | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Oct 2013 |
| 58 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |
| 59 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 60 | Eclipse Oil & Gas, Inc. | Midland, TX 79703 | Oil & Gas Operator | May 2025 |
| 61 | Eclipse Services, Inc. * | La Grange, TX 78945 | Oil & Gas Operator | Jul 2003 |
| 62 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 63 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 64 | El Tres Exploration | Houston, TX 77098 | Oil & Gas Operator | Mar 2008 |
| 65 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 66 | Endeavor Natural Gas, LP | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 67 | Endeavor Production Company | San Angelo, TX 76904 | Oil & Gas Operator | Mar 2008 |
| 68 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 69 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 70 | EP Energy E&P Company, LP | Houston, TX 77210 | Oil & Gas Operator | May 2022 |
| 71 | Etc Field Services LLC | San Antonio, TX 78258 | Oil Operator | Jun 2018 |
| 72 | Etc Texas Pipeline, LTD. | Dallas, TX 75225 | Oil Operator | Sep 2023 |
| 73 | Eurovest Oil & Gas, Inc. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 74 | Evantech Energy Corp. | Fort Worth, TX 76120 | Oil & Gas Operator | Apr 1995 |
| 75 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 76 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 77 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 78 | Finley Resources Inc | Fort Worth, TX 76113 | Oil & Gas Operator | May 2025 |
| 79 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 80 | Flint Interests, LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 81 | Fort Apache Energy, Inc. | Boerne, TX 78015 | Oil & Gas Operator | May 2025 |
| 82 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 83 | Forza Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 84 | Future Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Sep 1999 |
| 85 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | May 2025 |
| 86 | Galloway Lone Star, L.L.C. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 87 | Gcea, LLC | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 88 | Geosouthern Operating II, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 89 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 90 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 91 | Grit Oil & Gas, LLC | Houston, TX 77072 | Oil & Gas Operator | Apr 2019 |
| 92 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 93 | H.E.R. Operating, LLC | Silsbee, TX 77656 | Oil & Gas Operator | May 2025 |
| 94 | H.E.X.T. Operating, LTD. | Buna, TX 77612 | Oil Operator | Mar 2024 |
| 95 | Haber Resources Corporation | Houston, TX 77063 | Oil & Gas Operator | Mar 1999 |
| 96 | Hanson Minerals Co. | Houston, TX 77042 | Oil & Gas Operator | Oct 1993 |
| 97 | Hanson Production Company | Cuero, TX 77954 | Oil & Gas Operator | Jul 2009 |
| 98 | Hart Petroleum Services, Inc | Robstown, TX 78380 | Oil & Gas Operator | May 2025 |
| 99 | Hereford, J. A. Industries, Inc. | Nacogdoches, TX 75961 | Oil & Gas Operator | May 2025 |
| 100 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |