| 1 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 2 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | May 2025 |
| 3 | Amend Energy Company | Houston, TX 77227 | Oil & Gas Operator | Apr 2002 |
| 4 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 5 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 6 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 7 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2025 |
| 8 | Bataa Oil Inc | Arvada, CO 80005 | Oil & Gas Operator | Mar 2025 |
| 9 | Baxter, Murphy H. | Houston, TX 77002 | Oil & Gas Operator | Sep 1998 |
| 10 | Bettis, Boyle & Stovall | Graham, TX 76450 | Oil & Gas Operator | May 2025 |
| 11 | Big Wells Energy Corp | Katy, TX 77494 | Oil & Gas Operator | Sep 2019 |
| 12 | Black Stone Energy Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2004 |
| 13 | Bock & Bacon, Inc. | Houston, TX 77098 | Oil & Gas Operator | May 1999 |
| 14 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 15 | Brooklyn Union Explor. Co., Inc. | Houston, TX 77010 | Oil & Gas Operator | Jan 1994 |
| 16 | Bull Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | May 2025 |
| 17 | Cago, Inc. | College Sta, TX 77845 | Oil & Gas Operator | May 2025 |
| 18 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 19 | Calpine Natural Gas Company L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 20 | Calpine Natural Gas L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2006 |
| 21 | Carter-Langham, Inc. | Dallas, TX 75205 | Oil & Gas Operator | May 2025 |
| 22 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2025 |
| 23 | Cico Oil & Gas Company | Houston, TX 77057 | Oil & Gas Operator | Aug 2019 |
| 24 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | May 2025 |
| 25 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 26 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 27 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 28 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 29 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 30 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 31 | Davis Southern Operating Co LLC | Houston, TX 77004 | Oil & Gas Operator | May 2025 |
| 32 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | May 2025 |
| 33 | Delaware Davis Petroleum Corp. | Houston, TX 77056 | Oil & Gas Operator | Jan 2000 |
| 34 | El Paso Production Oil & Gas Co. | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 35 | Elliott Oil & Gas Company | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2006 |
| 36 | Elliott Oil & Gas Operating Co. | Magnolia, TX 77354 | Oil & Gas Operator | May 2025 |
| 37 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | May 2025 |
| 38 | Energy Transfer Crude Marketing LLC | Dallas, TX 75225 | Oil Operator | Jan 2025 |
| 39 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 40 | Famcor Oil, Inc. | Scottsdale, AZ 85260 | Oil & Gas Operator | Sep 2020 |
| 41 | Five-Jab, Inc. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 42 | Forcenergy Onshore Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 43 | Forest Oil Permian Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 44 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 45 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 46 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 47 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | May 2025 |
| 48 | Galloway Energy Co. | Tomball, TX 77377 | Oil & Gas Operator | May 2025 |
| 49 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 50 | Geo Asset Management, Inc. | Katy, TX 77493 | Oil & Gas Operator | May 2025 |
| 51 | Geopetra Partners, LLC | Irving, TX 75063 | Oil & Gas Operator | May 2025 |
| 52 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 53 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | May 2025 |
| 54 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | May 2025 |
| 55 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 56 | H.K.E. | Stafford, TX 77497 | Oil & Gas Operator | May 2025 |
| 57 | Harrison Interests, LTD. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 58 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2025 |
| 59 | HMX Investments, Inc. | Katy, TX 77494 | Oil & Gas Operator | Feb 2025 |
| 60 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 61 | Ipact | Austin, TX 78734 | Oil & Gas Operator | May 2025 |
| 62 | Jet Oil Producers | Coldspring, TX 77331 | Oil & Gas Operator | Mar 2008 |
| 63 | Jet Oil Producers, Inc. | Coldspring, TX 77331 | Oil & Gas Operator | May 2025 |
| 64 | Jurassic Exploration, Inc. | Longview, TX 75601 | Oil & Gas Operator | May 2025 |
| 65 | Kriti Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2012 |
| 66 | Lamay Corporation | Rosenberg, TX 77471 | Oil & Gas Operator | May 2025 |
| 67 | Left Behind Recovery, LLC | Luling, TX 78648 | Oil & Gas Operator | May 2025 |
| 68 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 69 | Lucky Lad Energy, LLC | Magnolia, TX 77353 | Oil & Gas Operator | May 2025 |
| 70 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 71 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 72 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | May 2025 |
| 73 | Nadsoilco LLC | Chicago, IL 60606 | Oil & Gas Operator | May 2025 |
| 74 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | May 2025 |
| 75 | North Central Oil Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2005 |
| 76 | Oil Lease Operating Co. | Coldspring, TX 77331 | Oil & Gas Operator | Aug 2003 |
| 77 | Oklatex Energy, Inc. | Beaumont, TX 77702 | Oil Operator | May 2025 |
| 78 | Old Pine Energy Corporation | Austin, TX 78755 | Oil Operator | May 2025 |
| 79 | Olipdp II, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 80 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | May 2025 |
| 81 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | May 2025 |
| 82 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 83 | PD Operating Company | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2005 |
| 84 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Feb 2025 |
| 85 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jan 2025 |
| 86 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 87 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 88 | Pyramid Exploration | Houston, TX 77241 | Oil & Gas Operator | Sep 1995 |
| 89 | Red Wolf Oil Company, Inc. | Brenham, TX 77833 | Oil & Gas Operator | May 2025 |
| 90 | Rodel Oil & Gas Company | Houston, TX 77218 | Oil & Gas Operator | May 2025 |
| 91 | Rosetta Resources Operating LP | San Antonio, TX 78216 | Oil & Gas Operator | May 2025 |
| 92 | Royal Oil & Gas Corp. | Indiana, PA 15701 | Oil & Gas Operator | Apr 2014 |
| 93 | Royal Production Company, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | May 2025 |
| 94 | Sabinal Resources, Inc. | Kingwood, TX 77339 | Oil & Gas Operator | May 2025 |
| 95 | Samson Resources Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 96 | Sandhawk Energy, LLC | Houston, TX 77079 | Oil & Gas Operator | Jun 2011 |
| 97 | Seabreeze Production Co | Hungerford, TX 77448 | Oil & Gas Operator | May 2025 |
| 98 | Shidler, Mark L., Inc. | Houston, TX 77055 | Oil & Gas Operator | May 2025 |
| 99 | Sizemore, James | Hardin, TX 77561 | Oil & Gas Operator | Jun 2003 |
| 100 | SM Energy Company | Midland, TX 79707 | Oil & Gas Operator | May 2025 |