| 1 | A. J. Hodges, Ind. Inc Et Al | | Oil & Gas Operator | Jan 1979 |
| 2 | A. Michael Hyde Oil & Gas Co. | | Oil & Gas Operator | Jan 1989 |
| 3 | A.J. Hodges Industries, Inc. | | Oil & Gas Operator | Sep 1987 |
| 4 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 5 | Ainsworth Prod Co. | | Oil Operator | Aug 1986 |
| 6 | Aix Energy Inc | | Oil & Gas Operator | Jul 2016 |
| 7 | Akin Beene Resources LLC | | Oil & Gas Operator | May 2016 |
| 8 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 9 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2012 |
| 10 | Ambrit Energy Corp. | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 11 | American Petrofina Co Of Texas | | Oil & Gas Operator | Jun 1985 |
| 12 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 13 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 14 | Aracca Petroleum Corporation | | Oil Operator | Dec 1987 |
| 15 | Arapahoe SPV LLC | | Oil & Gas Operator | Feb 2023 |
| 16 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 17 | Arena Resources LLC | Longview, TX 75608 | Oil & Gas Operator | Sep 2025 |
| 18 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 19 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 20 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 21 | Ashton Oil & Gas, Inc. | | Oil Operator | Jun 1990 |
| 22 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 23 | Atlanta Exploration Co. | | Oil & Gas Operator | Oct 2001 |
| 24 | Austral Oil Company Incorporated | Sulphur, LA 70663 | Oil & Gas Operator | Mar 2008 |
| 25 | B & D Operating Company | | Oil & Gas Operator | Apr 1990 |
| 26 | B. L. Ainsworth | | Oil Operator | Dec 1988 |
| 27 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 28 | Bass-Franks | | Oil & Gas Operator | Jun 1997 |
| 29 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 30 | Beebe And Beebe | | Oil & Gas Operator | Jun 2000 |
| 31 | Big Pine Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 32 | Black Gold Prod Co., Inc. | | Oil & Gas Operator | Feb 1998 |
| 33 | Blackbeard Operating East LLC | Midland, TX 79701-4532 | Oil & Gas Operator | Dec 2020 |
| 34 | Blackbird Company | Shreveport, LA 71106 | Oil & Gas Operator | Jan 2025 |
| 35 | Blanco Oil Co., Etal | | Oil Operator | Aug 1985 |
| 36 | Bob L. Herd | | Oil & Gas Operator | Dec 1979 |
| 37 | Bob L. Herd & Petrofunds | | Oil & Gas Operator | Mar 1984 |
| 38 | Bolinger Oil L.L.C. | | Oil Operator | Dec 2024 |
| 39 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 40 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 41 | Branch Investment Corporation | | Oil & Gas Operator | Jan 2025 |
| 42 | Breitburn Operating LP | Keithville, LA 71047 | Oil & Gas Operator | Dec 2025 |
| 43 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 44 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 45 | Broco Oil, LP | | Oil & Gas Operator | Nov 2024 |
| 46 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 47 | Bryant Oil & Gas Corporation | | Oil & Gas Operator | Mar 1987 |
| 48 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 49 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 50 | Byron Ruple | | Oil Operator | Jan 2025 |
| 51 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Aug 2025 |
| 52 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 53 | C. M. Roberson | | Oil Operator | Jun 1984 |
| 54 | Calpine Natural Gas Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2002 |
| 55 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 56 | Carraway Co. | | Oil Operator | Apr 2006 |
| 57 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 58 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 59 | Celt Oil, Inc. | | Oil & Gas Operator | Jun 1986 |
| 60 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 61 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 62 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 63 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 64 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 65 | Chateau Oil And Gas, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2017 |
| 66 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 67 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 68 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 69 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 70 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 71 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 72 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 73 | Clements Energy, Inc. | | Oil & Gas Operator | Oct 1987 |
| 74 | Click Corp | Monroe, LA 71207 | Oil & Gas Operator | Jan 2025 |
| 75 | Coastal Management Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 76 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 77 | Cody C. Beasley | | Oil & Gas Operator | Apr 1987 |
| 78 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 79 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 80 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 81 | Contango Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Sep 2025 |
| 82 | Contour Energy E & P, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 83 | Contour Energy E & P, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2003 |
| 84 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 85 | Cross Timbers Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 86 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 87 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 88 | CSC Energy Corp. | | Oil & Gas Operator | Dec 2009 |
| 89 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 90 | D&S Oil & Gas Operators, Inc. | | Oil & Gas Operator | Dec 2020 |
| 91 | D. W. Tanner | | Oil & Gas Operator | May 2000 |
| 92 | Dal-Long Oil Company | Longview, TX 75608 | Oil Operator | Feb 2001 |
| 93 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 94 | David Crow | | Oil & Gas Operator | Nov 1985 |
| 95 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 96 | Dean Petroleum | | Oil & Gas Operator | Jun 2000 |
| 97 | Deblin Oil & Gas, Inc | | Oil & Gas Operator | Aug 1995 |
| 98 | Deep South Production | | Oil Operator | Dec 2023 |
| 99 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 100 | Delphi International, Inc. | Tulsa, OK 74104 | Oil Operator | Sep 2025 |