| 1 | A. Michael Hyde Oil & Gas Co. | | Oil & Gas Operator | Jan 1989 |
| 2 | Abco Petroleum Corp. | | Oil & Gas Operator | Jan 1999 |
| 3 | Acadian Land & Expl., Inc. | | Oil & Gas Operator | May 1992 |
| 4 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Nov 2024 |
| 5 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 6 | Akin Beene Resources LLC | | Oil & Gas Operator | May 2016 |
| 7 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 8 | Alice-Sidney Oil Co LTD PRTSHP | | Oil & Gas Operator | Mar 2020 |
| 9 | Altair Corporation | | Oil & Gas Operator | Jul 1998 |
| 10 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 11 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 12 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 13 | Arapahoe SPV LLC | | Oil & Gas Operator | Feb 2023 |
| 14 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 15 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 16 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 17 | Art Machin & Associates, Inc. | | Oil & Gas Operator | Jul 1997 |
| 18 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 19 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 20 | B & D Operating Company | | Oil & Gas Operator | Apr 1990 |
| 21 | Badak Energy Inc. | | Oil & Gas Operator | Oct 2020 |
| 22 | Badak Energy-Carraway Co | | Oil Operator | Dec 1990 |
| 23 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Nov 2024 |
| 24 | Bayou Production Company, Inc. | | Oil & Gas Operator | Apr 1993 |
| 25 | Bayou South Gas Gather. Co L C | | Oil Operator | Oct 2002 |
| 26 | Beebe And Beebe | | Oil & Gas Operator | Jun 2000 |
| 27 | Beusa Energy, Inc. | Spring, TX 77380 | Oil & Gas Operator | Apr 2011 |
| 28 | Beusa Energy, LLC | | Oil & Gas Operator | Nov 2017 |
| 29 | BHP Billiton Petro (KCS Resources), LLC | | Oil & Gas Operator | Jul 2019 |
| 30 | BHP Billiton Petro (Txla Operating) Co. | | Gas Operator | Jul 2019 |
| 31 | BHP Billiton Petro (WSF Operating), Inc. | | Oil & Gas Operator | Jul 2019 |
| 32 | Big Pine Petroleum Inc. | | Oil & Gas Operator | Jun 2024 |
| 33 | Bigfoot Energy Services LLC | Carthage, TX 75633 | Oil & Gas Operator | Aug 2024 |
| 34 | Bileta Corporation | | Oil & Gas Operator | Aug 2010 |
| 35 | Billy E. Bayles | | Oil & Gas Operator | Apr 1998 |
| 36 | Blackbeard Operating East, LLC | Midland, TX 79701-4532 | Oil & Gas Operator | Dec 2020 |
| 37 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 38 | Blue Diamond Drilling, Inc. | | Oil Operator | Nov 1995 |
| 39 | BMR Oil & Gas, Inc. | | Oil & Gas Operator | Jun 2024 |
| 40 | Bob Sibley | | Oil & Gas Operator | Jul 2024 |
| 41 | Bodcaw Company | | Oil & Gas Operator | Oct 1979 |
| 42 | Bonita Hydrocarbons Company | Dallas, TX 75229 | Oil & Gas Operator | Jun 2008 |
| 43 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 44 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2024 |
| 45 | Branch Investment Corporation | | Oil & Gas Operator | Jun 2024 |
| 46 | Bray Drilling Co., Inc. | | Oil Operator | Feb 1982 |
| 47 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 48 | Brix Operating LLC | | Gas Operator | Apr 2021 |
| 49 | Bronco Resources Inc. | | Oil Operator | Dec 1984 |
| 50 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Nov 2024 |
| 51 | Burns Oil & Gas Expl. | | Oil & Gas Operator | Jan 1985 |
| 52 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Aug 2024 |
| 53 | C. H. C. Gerard | | Oil & Gas Operator | Jul 2024 |
| 54 | C. L. Morris | | Oil Operator | Feb 2004 |
| 55 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 56 | C.B.C. Producing Co. | | Oil & Gas Operator | Jul 1989 |
| 57 | C6 Operating, L.L.C. | Keatchie, LA 71046 | Oil & Gas Operator | Nov 2024 |
| 58 | Caddo Resources Inc | | Oil & Gas Operator | Dec 1986 |
| 59 | Calais Oil & Gas, L.L.C. | | Oil Operator | Jun 2024 |
| 60 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Nov 2024 |
| 61 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 62 | Carder Oil Company | | Oil & Gas Operator | Jun 2024 |
| 63 | Carr Petroleum, Inc. | | Oil Operator | Apr 1987 |
| 64 | Carraway Co. | | Oil Operator | Apr 2006 |
| 65 | Celt Oil, Inc. | | Oil & Gas Operator | Jun 1986 |
| 66 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 67 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2024 |
| 68 | Chesapeake Operating, LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Nov 2024 |
| 69 | Christopher Oil & Gas Inc | Fulshear, TX 77441 | Oil & Gas Operator | Apr 2015 |
| 70 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 71 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 72 | Cits BK & Trust Of Springhill | | Oil & Gas Operator | Jun 1990 |
| 73 | Clayton Williams Energy, Inc. | Houston, TX 77070 | Oil & Gas Operator | Apr 2017 |
| 74 | CNC Oil Co., Inc. | | Oil Operator | Aug 1991 |
| 75 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Nov 2024 |
| 76 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Jun 2024 |
| 77 | ConocoPhillips Company | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 78 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Nov 2024 |
| 79 | Cornerstone Natural Gas Co. | | Oil Operator | Oct 1999 |
| 80 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 81 | Crystal Oil & Land Company | | Oil & Gas Operator | Apr 2002 |
| 82 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 83 | CSC Energy Corp. | | Oil & Gas Operator | Dec 2009 |
| 84 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2024 |
| 85 | D&S Oil & Gas Operators, Inc. | | Oil & Gas Operator | Dec 2020 |
| 86 | D. B. Braddock | | Oil & Gas Operator | Jan 1986 |
| 87 | D. B. Braddock-Kisatchie Res. | | Oil & Gas Operator | Jan 1985 |
| 88 | D. L. Gish | | Oil Operator | Mar 1992 |
| 89 | D. L. Gish Oil Partnership | | Oil Operator | Feb 1989 |
| 90 | D. L. Gish Oil, Inc. | | Oil Operator | Jul 1998 |
| 91 | D. L. Gish, Inc. | | Oil Operator | Jun 1990 |
| 92 | Dal-Long Oil Company | | Oil Operator | Feb 2001 |
| 93 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 94 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 95 | David A. Robinson | | Oil Operator | Jan 1999 |
| 96 | David Crow | | Oil & Gas Operator | Nov 1985 |
| 97 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 98 | DDC & T Operating Company, Inc | | Oil & Gas Operator | Jul 2005 |
| 99 | Delta Petroleum Inc | Houston, TX 77269-1007 | Oil & Gas Operator | May 2009 |
| 100 | Devon Energy Production Company LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Nov 2024 |