| 1 | 5-N Energy | Winnsboro, TX 75494 | Oil & Gas Operator | Aug 2011 |
| 2 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 3 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 4 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 5 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2025 |
| 6 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 7 | Armor Resources LLC | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 8 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 9 | Atmos Pipeline - Texas | Dallas, TX 75240 | Oil & Gas Operator | May 2025 |
| 10 | B & B Oil, Inc. | Kerrville, TX 78028 | Oil & Gas Operator | May 2025 |
| 11 | B J Resources, L.L.C. | Athens, TX 75751 | Oil & Gas Operator | May 2025 |
| 12 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 13 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | May 2025 |
| 14 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 15 | Bevo Production Co. | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2014 |
| 16 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2025 |
| 17 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | May 2025 |
| 18 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 19 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2025 |
| 20 | Brooks Petroleum Company | Tyler, TX 75703 | Oil & Gas Operator | May 2025 |
| 21 | Brothers Oil & Equipment, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 22 | Brothers Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2004 |
| 23 | Browning, L. P. | Van, TX 75790 | Oil & Gas Operator | May 2025 |
| 24 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | May 2025 |
| 25 | C&P Resources Operating Co,LLC | Houston, TX 77056 | Oil & Gas Operator | May 2025 |
| 26 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 27 | Cameron, Paul E., Jr., Inc. | Montgomery, TX 77356 | Oil & Gas Operator | May 2015 |
| 28 | Card Operating Company, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 1995 |
| 29 | Cashco Oil Company | Houston, TX 77024 | Oil & Gas Operator | Aug 2003 |
| 30 | Chanze Oil Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 31 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 32 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 33 | Cinron Energy, LLC | Arp, TX 75750 | Oil & Gas Operator | May 2025 |
| 34 | Clear Brooke Ranches, LLC | Fort Worth, TX 76179 | Oil & Gas Operator | May 2025 |
| 35 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 36 | Cottonwood Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 37 | Crawford And Cameron Group | Houston, TX 77074 | Oil & Gas Operator | May 1997 |
| 38 | Crawford Energy Operating Co | Houston, TX 77056 | Oil & Gas Operator | Aug 2008 |
| 39 | Crawford Energy, Incorporated | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 40 | Crawford Hughes Operating Co. | The Woodlands, TX 77380 | Oil & Gas Operator | May 2025 |
| 41 | Cross Timbers Energy, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 42 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 43 | Cynpat Oil & Gas, Inc. | Sulphur SPGS, TX 75482 | Oil Operator | Nov 2018 |
| 44 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 45 | Davis Bros. Oil Producers, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2020 |
| 46 | Delfin Operating, LLC | Dallas, TX 75243 | Oil & Gas Operator | May 2025 |
| 47 | Devine, C. R., Inc. | Houston, TX 77292 | Oil & Gas Operator | Feb 2018 |
| 48 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 49 | Doughtie Operating Company, LLC | MC Queeney, TX 78123 | Oil & Gas Operator | Mar 2023 |
| 50 | Dyersdale Production Co, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2025 |
| 51 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | May 2025 |
| 52 | Eagle Rock Mid-Continent Op, LLC | Houston, TX 77252 | Oil & Gas Operator | Sep 2015 |
| 53 | Eagle Rock Operating Company,LLC | Houston, TX 77252 | Oil & Gas Operator | Oct 2015 |
| 54 | Eex Corporation | Houston, TX 77060 | Oil & Gas Operator | Feb 2000 |
| 55 | Egl Oil And Gas Corporation | Tyler, TX 75703 | Oil & Gas Operator | Aug 2003 |
| 56 | Eland Energy Inc | Dallas, TX 75248 | Oil & Gas Operator | Mar 2025 |
| 57 | Enbridge Pipelines (Ne Texas) LP | Houston, TX 77002 | Oil & Gas Operator | Jan 2010 |
| 58 | Energy 2000, Inc. | Reno, NV 89501 | Oil & Gas Operator | May 2025 |
| 59 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 60 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 61 | Enserch Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 62 | EP Operating Limited Partnership | Dallas, TX 75201 | Oil & Gas Operator | Feb 1995 |
| 63 | Estate Oil & Gas Corp. | Dallas, TX 75206 | Oil & Gas Operator | Oct 2011 |
| 64 | Etoco, L.P. | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 65 | Exxon Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2024 |
| 66 | Exxon Mobil Corporation | Spring, TX 77389 | Oil & Gas Operator | May 2025 |
| 67 | Fair Oil, LTD. | Tyler, TX 75710 | Oil & Gas Operator | May 2025 |
| 68 | Floex Energy LLC | Tyler, TX 75701 | Oil Operator | May 2025 |
| 69 | Fortune Resources LLC | Longview, TX 75604 | Oil & Gas Operator | May 2025 |
| 70 | Frisco Energy, L.L.C. | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2025 |
| 71 | Genecov Group, Inc. The | Tyler, TX 75713 | Oil & Gas Operator | Dec 2002 |
| 72 | Germany Exploration Co | Carrollton, TX 75006 | Oil & Gas Operator | Nov 1986 |
| 73 | Graward Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | May 2025 |
| 74 | Griffin Operating, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Mar 2017 |
| 75 | Halbouty, Michel T. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 76 | Halo Energy L.L.C. | Kilgore, TX 75662 | Oil Operator | May 2025 |
| 77 | Harleton Oil & Gas Inc. | Tyler, TX 75710 | Oil & Gas Operator | May 2025 |
| 78 | Hawkins Oil & Gas Inc | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2016 |
| 79 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 80 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | May 2025 |
| 81 | Hibbard Energy, LP | Whitehouse, TX 75791 | Oil & Gas Operator | May 2025 |
| 82 | High Island Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jun 2017 |
| 83 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 84 | Hinton Production Company | MT Pleasant, TX 75455 | Oil & Gas Operator | Aug 1995 |
| 85 | Hootkins, Seymour G. | Archer City, TX 76351 | Oil & Gas Operator | Apr 1997 |
| 86 | Howard, Anthony E. F. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2001 |
| 87 | Huggs Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2003 |
| 88 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 89 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | May 2025 |
| 90 | Imperial Oil Company | Houston, TX 77073 | Oil & Gas Operator | Oct 2004 |
| 91 | Inexco Oil Company | Houston, TX 77210 | Oil & Gas Operator | Mar 2013 |
| 92 | J-O'B Operating Company | Shreveport, LA 71135 | Oil & Gas Operator | May 2025 |
| 93 | Jamex, Inc. | Lewisville, TX 75067 | Oil & Gas Operator | May 2025 |
| 94 | Jan Oil Company | Oklahoma City, OK 73156 | Oil & Gas Operator | May 2006 |
| 95 | Joy Resources, Inc. | Houston, TX 77027 | Oil & Gas Operator | May 2025 |
| 96 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | May 2025 |
| 97 | Kalos Corporation | Tyler, TX 75701 | Oil & Gas Operator | May 2025 |
| 98 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 99 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 100 | Kerr-McGee Corporation | Dallas, TX 75380 | Oil & Gas Operator | Mar 2025 |