| 1 | Acadian Gas Pipeline System | | Oil Operator | Jul 2024 |
| 2 | Alliance Resources Corporation | Dallas, TX 75367 | Oil & Gas Operator | Dec 2024 |
| 3 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 4 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 5 | Anschutz Corporation, The | Denver, CO 80202 | Oil & Gas Operator | Sep 2016 |
| 6 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 7 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 8 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 9 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 10 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 11 | Bayou South Gas Gather. Co L C | | Oil Operator | Oct 2002 |
| 12 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 13 | BPR Energy, Inc. | | Oil & Gas Operator | Apr 2021 |
| 14 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 15 | Brammer-Keystone Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 16 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 17 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2024 |
| 18 | Burlington Res Oil & Gas LP | Houston, TX 77079 | Oil & Gas Operator | Sep 2024 |
| 19 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Sep 2024 |
| 20 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Dec 2024 |
| 21 | Chaparral Exploration, Inc. | | Oil & Gas Operator | Jul 2000 |
| 22 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Aug 2024 |
| 23 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 24 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 25 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 26 | Compass Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2024 |
| 27 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 28 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Jun 2024 |
| 29 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 30 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 31 | Crystal Oil & Land Company | | Oil & Gas Operator | Apr 2002 |
| 32 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 33 | CSM, Inc. | | Gas Operator | Oct 1990 |
| 34 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 35 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 36 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 37 | Devon Energy Operating Co., L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2009 |
| 38 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2024 |
| 39 | Devon Louisiana Corporation | Houston, TX 77002 | Oil & Gas Operator | Oct 2019 |
| 40 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 41 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 42 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |
| 43 | Ensight IV Energy Management,LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2024 |
| 44 | Ensight Resources, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2001 |
| 45 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Dec 2024 |
| 46 | EP Operating Co, A LTD Ptrship | | Oil & Gas Operator | Oct 1992 |
| 47 | EP Operating Co. | Dallas, TX 75201 | Oil & Gas Operator | Jan 1993 |
| 48 | Excel Operating Corporation | | Oil & Gas Operator | Jun 2024 |
| 49 | Exco Operating Company, LP | Dallas, TX 75251 | Oil & Gas Operator | Dec 2024 |
| 50 | Exco Partners Operating PTSHP LP | Dallas, TX 75251 | Oil & Gas Operator | Jan 2009 |
| 51 | Exco Resources Inc | Dallas, TX 75251 | Oil & Gas Operator | Sep 2024 |
| 52 | Exco/Hgi JV Assets, LLC | Dallas, TX 75251 | Oil & Gas Operator | Jun 2014 |
| 53 | Feazel Operating Company, Inc. | | Oil & Gas Operator | Feb 1979 |
| 54 | Fina Oil And Chemical Company | Dallas, TX 75221 | Oil & Gas Operator | May 2019 |
| 55 | Fredonia Resources Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2003 |
| 56 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 57 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 58 | George R Schurman | | Oil & Gas Operator | Oct 2015 |
| 59 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 60 | GPM, Inc. | | Oil & Gas Operator | Jun 1994 |
| 61 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 62 | Gulf States Pipeline Corp. | | Oil & Gas Operator | May 2003 |
| 63 | Harvey Broyles | | Oil & Gas Operator | May 2012 |
| 64 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 65 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Dec 2024 |
| 66 | Hilliard Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2009 |
| 67 | Hunt Petroleum Corporation | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 68 | Indigo Minerals LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2022 |
| 69 | Jack W. Grigsby | | Oil & Gas Operator | Sep 2001 |
| 70 | Jeems Bayou Production Corp. | Oil City, LA 71061 | Oil & Gas Operator | Dec 2024 |
| 71 | Jones-O'Brien, Inc. | | Oil & Gas Operator | Feb 1982 |
| 72 | Justiss Oil Company, Inc. | Jena, LA 71342 | Oil & Gas Operator | Jul 2024 |
| 73 | Justiss-Mears Oil Co. | | Oil & Gas Operator | Feb 1981 |
| 74 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2024 |
| 75 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Oct 2024 |
| 76 | Kilroy Co. Of Texas, Inc. | | Oil & Gas Operator | Jun 1991 |
| 77 | Kimball Production Co. | Houston, TX 77042 | Oil & Gas Operator | Jul 2002 |
| 78 | KJ Energy, LLC Of Delaware | | Oil & Gas Operator | Nov 2016 |
| 79 | Laser Gas Company I, LLC | | Oil Operator | Aug 2007 |
| 80 | Lear Gas Transmission | | Oil Operator | Aug 1989 |
| 81 | Linn Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2019 |
| 82 | Linn Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2017 |
| 83 | Lyons Petroleum, Inc. | | Oil & Gas Operator | Oct 1988 |
| 84 | Lyons, Hilliard & Watson, Inc. | | Oil & Gas Operator | Jan 1989 |
| 85 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 86 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2024 |
| 87 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Sep 2024 |
| 88 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2024 |
| 89 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 90 | Mec-Goodrich Oil Co. | | Oil & Gas Operator | Feb 1985 |
| 91 | Mineral Ventures, Inc. | | Oil & Gas Operator | Jun 2024 |
| 92 | Mitchell Energy & Goodrich Oil | | Oil & Gas Operator | Feb 1985 |
| 93 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 94 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 95 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 96 | Mooringsport Energy Prod Corp | | Oil & Gas Operator | Oct 1994 |
| 97 | MRD Operating LLC | | Oil & Gas Operator | Dec 2016 |
| 98 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 99 | N Central Casing Pullers, Inc. | | Oil & Gas Operator | May 1994 |
| 100 | Nadel & Gussman-Jetta Oper. Co. | | Oil & Gas Operator | Mar 2012 |