| 1 | A & F Oil Company | | Oil & Gas Operator | Jan 2025 |
| 2 | A&K Production LLC Of Texas | | Oil & Gas Operator | Nov 2024 |
| 3 | A. J. Hodges, Ind. Inc Et Al | | Oil & Gas Operator | Jan 1979 |
| 4 | A. Michael Hyde Oil & Gas Co. | | Oil & Gas Operator | Jan 1989 |
| 5 | A.J. Hodges Industries, Inc. | | Oil & Gas Operator | Sep 1987 |
| 6 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Dec 2025 |
| 7 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 8 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 9 | American Quasar Petroleum Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2014 |
| 10 | Amoco Production Company | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 11 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 12 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 13 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 14 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2025 |
| 15 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 16 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 17 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 18 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 19 | Arkla Expl.Co & George E Woods | | Oil & Gas Operator | Dec 1992 |
| 20 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 21 | Art Machin & Associates, Inc. | | Oil & Gas Operator | Jul 1997 |
| 22 | Arthur Arnold | | Oil Operator | Dec 1991 |
| 23 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 24 | Bachtell Oil & Gas, LTD. | Longview, TX 75605 | Oil & Gas Operator | Dec 2025 |
| 25 | Backus & Lanford | | Oil Operator | Aug 1985 |
| 26 | Barco Co. | | Oil & Gas Operator | Dec 2000 |
| 27 | Barry Rock Oil Co. Inc. | Plain Dealing, LA 71064 | Oil & Gas Operator | Dec 2024 |
| 28 | Bayou Production Company, Inc. | | Oil & Gas Operator | Apr 1993 |
| 29 | Bayou South Gas Gather. Co L C | | Oil Operator | Oct 2002 |
| 30 | Bayou State Oil Corporation | | Oil & Gas Operator | Dec 2024 |
| 31 | BCF Operating, LLC | | Oil & Gas Operator | Nov 2024 |
| 32 | Berkshire Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 33 | Betsy Production Company, Inc. | Magnolia, AR 71753 | Oil & Gas Operator | Sep 2025 |
| 34 | BHP Billiton Petro (KCS Resources), LLC | | Oil & Gas Operator | Jul 2019 |
| 35 | BHP Billiton Petro (Txla Operating) Co. | | Gas Operator | Jul 2019 |
| 36 | BHP Billiton Petro (WSF Operating), Inc. | | Oil & Gas Operator | Jul 2019 |
| 37 | BHP Petroleum Company Inc | Houston, TX 77057 | Oil & Gas Operator | Jun 2016 |
| 38 | Big Pine Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 39 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 40 | Blackbird Company | Shreveport, LA 71106 | Oil & Gas Operator | Jan 2025 |
| 41 | Bob Sibley | | Oil & Gas Operator | Jan 2025 |
| 42 | Bodcaw Company | | Oil & Gas Operator | Oct 1979 |
| 43 | Bolinger Oil L.L.C. | | Oil Operator | Dec 2024 |
| 44 | Bomar Oil & Gas, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Dec 2020 |
| 45 | BPX (KCS Resources), LLC | | Oil & Gas Operator | Feb 2022 |
| 46 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 47 | Brammer-Keystone Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 48 | Branch Investment Corporation | | Oil & Gas Operator | Jan 2025 |
| 49 | Broad Oak Energy, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Jul 2011 |
| 50 | Broad Street Financial Co. | | Oil & Gas Operator | Nov 1998 |
| 51 | Bruxoil, Inc. | | Oil & Gas Operator | Aug 2025 |
| 52 | Buckingham Oil Company | Longview, TX 75606 | Oil & Gas Operator | Aug 2004 |
| 53 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 54 | C & M Operating Company | Graham, TX 76450 | Oil & Gas Operator | Aug 2025 |
| 55 | C & S Properties | | Oil & Gas Operator | Jun 1996 |
| 56 | C. L. Morris, Inc. | | Oil & Gas Operator | Feb 2004 |
| 57 | C. Smith & Associates, Inc. | | Oil Operator | Aug 1991 |
| 58 | Caddo Management, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 59 | Caddo Oil Co.,Inc. | | Oil & Gas Operator | Apr 1987 |
| 60 | Caddo Parish Holdings LLC | | Oil & Gas Operator | Jul 2020 |
| 61 | Caddo Resources Inc | | Oil & Gas Operator | Dec 1986 |
| 62 | Callon Petroleum Operating Co | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 63 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Dec 2025 |
| 64 | Canstar Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1994 |
| 65 | Carl P. Roppolo, Jr. | | Oil & Gas Operator | Mar 1991 |
| 66 | Caruthers Operating Co., Inc. | | Oil & Gas Operator | Jul 2010 |
| 67 | Caruthers Producing Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2019 |
| 68 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 69 | Cathey Oil, Inc. | | Oil & Gas Operator | Aug 2009 |
| 70 | Centerpoint Energy FLD Ser Inc | | Oil Operator | Feb 2011 |
| 71 | Champlin Petroleum Co. | Rock Springs, WY 82902 | Oil & Gas Operator | Mar 1991 |
| 72 | Charles E. Mayfield | | Oil & Gas Operator | Mar 2001 |
| 73 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 74 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 75 | Cinder Production Company | | Oil & Gas Operator | Apr 2014 |
| 76 | Cities Service Company | | Oil & Gas Operator | Mar 1983 |
| 77 | Cities Service Oil & Gas Corp | | Oil & Gas Operator | Mar 1988 |
| 78 | Cities Service Oil Co. | | Oil & Gas Operator | Dec 1986 |
| 79 | Cody C. Beasley | | Oil & Gas Operator | Apr 1987 |
| 80 | Comstock Oil & Gas -- La, Inc. | | Oil & Gas Operator | Mar 2005 |
| 81 | Comstock Oil & Gas--La, LLC | | Oil & Gas Operator | Dec 2024 |
| 82 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 83 | Cornerstone Natural Gas Co. | | Oil Operator | Oct 1999 |
| 84 | Coronado Energy E&P Company, LLC | Houston, TX 77252 | Oil & Gas Operator | Dec 2010 |
| 85 | Cotton Petroleum Corporation | Tulsa, OK 74102 | Oil & Gas Operator | Jan 2005 |
| 86 | Covey Park Gas LLC | | Oil & Gas Operator | Aug 2019 |
| 87 | Crystal Oil And Land Company | | Oil & Gas Operator | May 1992 |
| 88 | Crystal Oil Company | Shreveport, LA 71120 | Oil & Gas Operator | Jul 1995 |
| 89 | CSX Oil & Gas Corporation | Houston, TX 77210-4326 | Oil & Gas Operator | Mar 1993 |
| 90 | Cypress Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 91 | D&S Oil & Gas Operators, Inc. | | Oil & Gas Operator | Dec 2020 |
| 92 | D. B. McConnell | | Oil & Gas Operator | Oct 1991 |
| 93 | D. B. McConnell Et Al | | Oil & Gas Operator | Nov 1993 |
| 94 | Dallas Production, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Mar 2021 |
| 95 | David Crow | | Oil & Gas Operator | Nov 1985 |
| 96 | David Lynn Chiles | | Oil & Gas Operator | Aug 2020 |
| 97 | DCP Midstream, LLC | | Oil Operator | Jun 2016 |
| 98 | DDC & T Operating Company, Inc | | Oil & Gas Operator | Jul 2005 |
| 99 | Dean Petroleum | | Oil & Gas Operator | Jun 2000 |
| 100 | Deep South Production | | Oil Operator | Dec 2023 |