| 1 | 4R Oil Company | Tyler, TX 75703 | Oil & Gas Operator | Apr 1997 |
| 2 | A & E Minerals, LLC | Shreveport, LA 71104 | Oil & Gas Operator | Oct 2025 |
| 3 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 4 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 5 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Oct 2025 |
| 6 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 7 | Allen Brothers Company | Oil City, LA 71061 | Oil & Gas Operator | Apr 1997 |
| 8 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Oct 2025 |
| 9 | Aln Resources Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 1993 |
| 10 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 11 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 12 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 13 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 14 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 15 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 16 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 17 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 18 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 19 | Andrew Alan Exploration, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2017 |
| 20 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 21 | Apex Royalties, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 1997 |
| 22 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Oct 2025 |
| 23 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 24 | Arena Resources LLC | Longview, TX 75608 | Oil & Gas Operator | Jul 2025 |
| 25 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 26 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 27 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 28 | Arlen Corporation | Houston, TX 77077 | Oil & Gas Operator | Mar 2008 |
| 29 | Arrowhead Energy Exp., LLC | Baton Rouge, LA 70816 | Oil & Gas Operator | Nov 2006 |
| 30 | Arrowhead Enterprises, Inc. | Baton Rouge, LA 70816 | Oil & Gas Operator | Apr 2001 |
| 31 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 32 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 33 | Bachtell Oil & Gas, LTD. | Longview, TX 75605 | Oil & Gas Operator | Oct 2025 |
| 34 | Bachtell, Charles Ray | Longview, TX 75605 | Oil & Gas Operator | Feb 2004 |
| 35 | Bahr Oil & Gas | Shalimar, FL 32579 | Oil & Gas Operator | Oct 2025 |
| 36 | Bailey Oil Co., Inc. | Neodesha, KS 66757 | Oil & Gas Operator | Jun 2025 |
| 37 | Baron Energy Inc. | San Marcos, TX 78666 | Oil & Gas Operator | Oct 2025 |
| 38 | Barrow-Shaver Resources Co. | Tyler, TX 75703 | Oil & Gas Operator | Oct 2025 |
| 39 | Basa Resources, Inc. | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 40 | Basic Energy Services, L.P. | Fort Worth, TX 76102 | Oil Operator | Oct 2025 |
| 41 | Bateman'S Bay Exploration, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jun 2025 |
| 42 | Benco Operating, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 43 | Berkshire Operating, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 44 | Berkshire Woodlawn Field, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 45 | Berry Oil Comp. | Houston, TX 77002 | Oil & Gas Operator | Jul 2014 |
| 46 | Berry Oil Company, LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Apr 2019 |
| 47 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Aug 2025 |
| 48 | BHP Billiton Pet(Txla Op) Co | Denver, CO 80202 | Oil & Gas Operator | Jul 2019 |
| 49 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 50 | Bishop Petroleum Inc. | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 51 | Bitz, M. J. Company | Fort Worth, TX 76116 | Oil & Gas Operator | Aug 2003 |
| 52 | BKM Production | Gainesville, TX 76240 | Oil & Gas Operator | Oct 2025 |
| 53 | Blair Oil Company | Kingfisher, OK 73750-1213 | Oil & Gas Operator | Jun 2025 |
| 54 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Oct 2025 |
| 55 | Blue Dome Operating, LLC | Tulsa, OK 74119 | Gas Operator | Oct 2025 |
| 56 | Bowles Energy, Inc. | Longview, TX 75601 | Oil & Gas Operator | Oct 2025 |
| 57 | Bowles Properties, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 1998 |
| 58 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 59 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 60 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 61 | Brammer Petroleum, Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Oct 2025 |
| 62 | Brammer-Keystone Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2000 |
| 63 | Brandon Energy, Inc. | Bullard, TX 75757 | Oil & Gas Operator | Nov 2007 |
| 64 | Brangus Energy LLC | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 65 | Brannon Oil & Gas Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2013 |
| 66 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 67 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 68 | BRG Petroleum, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2020 |
| 69 | Brian Energy | Kilgore, TX 75663 | Oil & Gas Operator | May 2013 |
| 70 | Brian Energy, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2020 |
| 71 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 72 | Brooks Petroleum Company | Tyler, TX 75703 | Oil & Gas Operator | Oct 2025 |
| 73 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Oct 2025 |
| 74 | Brothers Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2004 |
| 75 | Brower Oil & Gas Co., Inc. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 76 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 77 | Brown, J. Burns Operating Co. | Havre, MT 59501 | Oil & Gas Operator | Jul 2025 |
| 78 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 79 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 80 | C. W. Resources, Inc. | Longview, TX 75604 | Oil & Gas Operator | Oct 2025 |
| 81 | Cameron Exploration, Inc. | Longview, TX 75604 | Oil & Gas Operator | Oct 2025 |
| 82 | Camterra Resources, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 83 | Cape Operating, Inc. | Longview, TX 75608 | Oil & Gas Operator | Nov 2007 |
| 84 | Cape, Randy | Tyler, TX 75703 | Oil & Gas Operator | Mar 2008 |
| 85 | Card Operating Company, Inc. | Tyler, TX 75713 | Oil & Gas Operator | Dec 1995 |
| 86 | Carr Resources, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Oct 2025 |
| 87 | Carter Resources | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2005 |
| 88 | Cavillo Oil Company LC Of Texas | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 89 | Cavillo Oil Corporation | Marshall, TX 75670 | Oil & Gas Operator | Jun 1998 |
| 90 | Cci East Texas Upstream LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2021 |
| 91 | Cci Gulf Coast Upstream LLC | Teague, TX 75860 | Oil & Gas Operator | Mar 2021 |
| 92 | Chalker Energy Management II,LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2008 |
| 93 | Chalker Energy Management,LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2006 |
| 94 | Chalker Operating Inc. | Richmond, TX 77406 | Oil & Gas Operator | Jul 2016 |
| 95 | Channel Production Company | Marshall, TX 75670 | Oil & Gas Operator | Oct 2025 |
| 96 | Chaparral (USA) Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2002 |
| 97 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Oct 2025 |
| 98 | Chemily Management Company | Cypress, TX 77429 | Oil & Gas Operator | Apr 2023 |
| 99 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Jun 2025 |
| 100 | Chinn Exploration Company | Longview, TX 75605 | Oil & Gas Operator | Nov 2015 |