| 1 | 31 Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 2 | 3tec Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2019 |
| 3 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 4 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2026 |
| 5 | Aeon Operating, Inc. | Fate, TX 75132 | Oil & Gas Operator | Sep 2026 |
| 6 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 7 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2026 |
| 8 | Alexander, Herbert R. Inc. | Houma, LA 70360 | Oil & Gas Operator | Jun 1998 |
| 9 | Allied Operating Texas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 10 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Sep 2026 |
| 11 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 12 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 13 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Sep 2026 |
| 14 | Andrews & Corkran, L.L.C. | Austin, TX 78746 | Oil & Gas Operator | Feb 2000 |
| 15 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 16 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2026 |
| 17 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 18 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | May 2026 |
| 19 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Sep 2026 |
| 20 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Sep 2026 |
| 21 | Atoka Operating, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Sep 2026 |
| 22 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Sep 2026 |
| 23 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Sep 2026 |
| 24 | Bay Rock Operating Company | San Antonio, TX 78212 | Oil & Gas Operator | Sep 2026 |
| 25 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 26 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 27 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Sep 2026 |
| 28 | Bison Energy Partners, LTD. | Houston, TX 77060 | Oil & Gas Operator | Apr 2002 |
| 29 | Black Diamond Operating Co., LLC | Kilgore, TX 75662 | Oil & Gas Operator | Sep 2009 |
| 30 | Blazer Resources, Inc. | Leesburg, TX 75451 | Oil & Gas Operator | Sep 2026 |
| 31 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Sep 2026 |
| 32 | Block T Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Jun 2026 |
| 33 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2026 |
| 34 | BP Prod. Corp. | Richardson, TX 75083 | Oil & Gas Operator | Sep 2026 |
| 35 | Brandon Energy, Inc. | Bullard, TX 75757 | Oil & Gas Operator | Nov 2007 |
| 36 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 37 | Branta Production Company LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2026 |
| 38 | Brazos Petroleum, Inc. | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 39 | Breitburn Operating LP | Keithville, LA 71047 | Oil & Gas Operator | Sep 2026 |
| 40 | BRG Lone Star LTD. | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2026 |
| 41 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 42 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 43 | Bridge Oil Company LP | Midland, TX 79702 | Oil & Gas Operator | May 1999 |
| 44 | Brighton Energy, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 45 | Brooks Petroleum Company | Tyler, TX 75703 | Oil & Gas Operator | Sep 2026 |
| 46 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2026 |
| 47 | Brown, George R. Partnership,The | Houston, TX 77002 | Oil & Gas Operator | May 2006 |
| 48 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Sep 2026 |
| 49 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 50 | Burlington Resources O&G | Midland, TX 79710-1810 | Oil & Gas Operator | Mar 1997 |
| 51 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | Oct 2025 |
| 52 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Sep 2026 |
| 53 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 54 | Can-Tex Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Nov 2003 |
| 55 | Card Operating Company, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 1995 |
| 56 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 57 | Caturus Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2026 |
| 58 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | May 2026 |
| 59 | Center Start, LC | Kilgore, TX 75663 | Oil & Gas Operator | May 2008 |
| 60 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 61 | CHB Interests, LLC | Kilgore, TX 75663 | Oil Operator | Oct 2011 |
| 62 | Cherco Properties, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Nov 1999 |
| 63 | Chesapeake Exploration LLC | Oklahoma City, OK 731540496 | Oil & Gas Operator | Jul 2020 |
| 64 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2026 |
| 65 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2026 |
| 66 | Chestnut Explor. And Prod., Inc. | Dallas, TX 75208 | Oil & Gas Operator | Sep 2026 |
| 67 | Chestnut Petroleum, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Nov 2011 |
| 68 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |
| 69 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Sep 2026 |
| 70 | Circle "M" Energy Inc. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 2003 |
| 71 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Sep 2026 |
| 72 | Classic Oil & Gas, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Jan 2004 |
| 73 | Comstock Oil & Gas, LLC | Frisco, TX 75034 | Oil & Gas Operator | Sep 2026 |
| 74 | Comstock Oil & Gas, LP | Frisco, TX 75034 | Oil & Gas Operator | Aug 2019 |
| 75 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 76 | Cordillera Texas, L.P. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Sep 2008 |
| 77 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 78 | Costilla Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 79 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 80 | Crescent Pass Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | May 2026 |
| 81 | Crimson Energy Company, LC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2004 |
| 82 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 83 | Culver & Cain Production LLC | Tyler, TX 75711 | Oil & Gas Operator | Sep 2026 |
| 84 | Cxy Energy, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Nov 2000 |
| 85 | D & H Production, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2024 |
| 86 | Dale Operating Company | Dallas, TX 75207 | Oil & Gas Operator | Sep 2026 |
| 87 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 88 | Daniel Mineral Development, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2007 |
| 89 | Davis William H | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2014 |
| 90 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 91 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Sep 2026 |
| 92 | Dominion Oklahoma Texas E&P, Inc | Richmond, VA 23219 | Oil & Gas Operator | Sep 2018 |
| 93 | Draco Production Company | Tulsa, OK 74133 | Oil & Gas Operator | Jul 2012 |
| 94 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 95 | Dunn Resources, LLC | Shreveport, LA 71115 | Oil & Gas Operator | Mar 2023 |
| 96 | Durango Resources Corp. | Houston, TX 77043 | Oil & Gas Operator | Sep 2026 |
| 97 | Dyersdale Energy, L.P. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 98 | Dyersdale Production Co, Inc. | Houston, TX 77019 | Oil & Gas Operator | Sep 2026 |
| 99 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2026 |
| 100 | East Texas Production MGT. Inc | Athens, TX 75751 | Oil & Gas Operator | Sep 2026 |