| 101 | A.E.N. Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jan 1996 |
| 102 | A.J. Hodges Industries, Inc. | | Oil & Gas Operator | Sep 1987 |
| 103 | A.L.S. Resources Inc. | | Oil Operator | Dec 2004 |
| 104 | A.O.E. Operators, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Oct 2025 |
| 105 | A2c Energy LLC | Houston, TX 77074 | Oil Operator | Oct 2025 |
| 106 | A2k LLC | Lancaster, NY 14086 | Gas Operator | Dec 2024 |
| 107 | A5 Oil And Gas LLC | | Oil Operator | Dec 2024 |
| 108 | Aa Production Services Inc. | | Gas Operator | Jul 2025 |
| 109 | Aaa Oil & Gas Inc | Pauls Valley, OK 73075-0863 | Oil Operator | Mar 2000 |
| 110 | Aaa Oil Company | Castroville, TX 78009 | Oil & Gas Operator | Oct 2025 |
| 111 | Aalpha Energy Inc. | | Oil & Gas Operator | Aug 2025 |
| 112 | Aardolie Oil Company | Dallas, TX 75370 | Oil & Gas Operator | Jul 2003 |
| 113 | Aaron & Jeter | Seminole, TX 79360 | Oil & Gas Operator | Jan 2003 |
| 114 | Aaron Arnold B | Sulphur, OK 73086-6853 | Oil & Gas Operator | May 2004 |
| 115 | Aaron Oil Company Inc | Shawnee, OK 74801-2321 | Oil Operator | Oct 2022 |
| 116 | Aaron Oil Operations LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 117 | Aaron Well Service Inc | Enid, OK 73703 | Gas Operator | Jul 2025 |
| 118 | Aaronmark Services, LLC | New Braunfels, TX 78130 | Oil Operator | Oct 2025 |
| 119 | Aas Oil Co., Inc. | Arkansas City, KS 67005 | Oil & Gas Operator | Jun 2025 |
| 120 | Ab Reserve, LLC | Rockdale, TX 76567 | Oil Operator | Oct 2025 |
| 121 | Ab Resources Oh LLC | Brecksville, OH 44141 | Oil & Gas Operator | Dec 2010 |
| 122 | Ab Resources Pa LLC | Brecksville, OH 44141-3296 | Oil & Gas Operator | Dec 2011 |
| 123 | Aba Energy Corporation | | Oil & Gas Operator | Aug 2025 |
| 124 | Aba Oil LLC | Burkburnett, TX 76354 | Oil Operator | Oct 2025 |
| 125 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Oct 2025 |
| 126 | Abarr Trust (The) | Oklahoma City, OK 73179 | Oil & Gas Operator | Jul 2025 |
| 127 | Abarta Oil & Gas Co., Inc. | Pittsburgh, PA 15238 | Oil & Gas Operator | Dec 2020 |
| 128 | Abarta Oil & Gas Co., LLC | | Oil & Gas Operator | Dec 2021 |
| 129 | Abb Oil Co., Inc. | Wichita Falls, TX 76310 | Oil & Gas Operator | Oct 2025 |
| 130 | Abbey, Kevin R. | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 131 | Abbott Donald Jay | Edinboro, PA 16412-4129 | Gas Operator | Dec 2018 |
| 132 | Abbott, John Operating | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 133 | ABC NRG | Vernon, TX 76384 | Oil Operator | Oct 2025 |
| 134 | ABC Oil & Gas | Morris, OK 74445-0273 | Oil & Gas Operator | May 2025 |
| 135 | ABC Oil Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2023 |
| 136 | Abco Petroleum Corp. | | Oil & Gas Operator | Feb 1999 |
| 137 | Abderhalden, R. R. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 138 | Abe Giesbrecht | | Gas Operator | Dec 1983 |
| 139 | Abel Production Company | San Angelo, TX 76904 | Oil & Gas Operator | Sep 2000 |
| 140 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 141 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 142 | Abercrombie A L | | Oil & Gas Operator | Nov 1995 |
| 143 | Abercrombie Dril | | Oil Operator | Jan 1990 |
| 144 | Abercrombie Drilling, Inc. | Wichita, KS 67202 | Oil Operator | May 1997 |
| 145 | Abercrombie Energy, LLC | Wichita, KS 67212 | Oil & Gas Operator | Jun 2025 |
| 146 | Abercrombie, A. L., Inc | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 147 | Aberdeen American Petroleum Co., Inc. | | Oil & Gas Operator | Dec 1989 |
| 148 | Aberdeen Petroleum (USA) Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1994 |
| 149 | Aberlour Operating Inc. | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 150 | Abernathy Auto, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 151 | Abernathy Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Mar 2002 |
| 152 | Abilene American Energy, LLC | Abilene, TX 79602 | Oil Operator | Oct 2025 |
| 153 | Ablaze Drilling Company | Garland, TX 75044-2912 | Oil & Gas Operator | Aug 2013 |
| 154 | Ableready, Inc. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 155 | Abney Oil Company, Inc. | | Oil Operator | Mar 1981 |
| 156 | Abng Inc | Chickasha, OK 73023-0926 | Oil & Gas Operator | Feb 2017 |
| 157 | Abo Petroleum Corp | Artesia, NM 88210 | Oil & Gas Operator | Jul 1988 |
| 158 | Abo Petroleum, LLC | Artesia, NM 88211 | Oil & Gas Operator | Jul 2025 |
| 159 | Abps Energy Inc | Chickasha, OK 73023-1658 | Oil & Gas Operator | Apr 2015 |
| 160 | Abraxas Petroleu | | Oil Operator | May 1986 |
| 161 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2025 |
| 162 | Abraxas Production Corporation | San Antonio, TX 78270 | Oil & Gas Operator | Sep 1999 |
| 163 | Abs Oil, Inc. | Piqua, KS 66761 | Oil Operator | Apr 2022 |
| 164 | Absolute Energy Corp | Columbus, OH 43213 | Oil & Gas Operator | Dec 1997 |
| 165 | Abtex Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | May 2006 |
| 166 | Abundance Energy I LLC | Tulsa, OK 74114 | Gas Operator | Jun 2025 |
| 167 | Abundance Energy LLC | Bartlesville, OK 74005-1087 | Oil & Gas Operator | Jul 2018 |
| 168 | Abundance Energy Services LLC | Tulsa, OK 74114 | Gas Operator | Jul 2025 |
| 169 | Abx Oil & Gas, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 170 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 171 | Ac Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 172 | Ac Oil LLC | Limestone, NY 14753 | Oil & Gas Operator | Dec 2024 |
| 173 | Ac Operating Company LLC | Houston, TX 77024-2851 | Oil Operator | Jul 2025 |
| 174 | Acacia Exploration Partners LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Nov 2021 |
| 175 | Acacia Operating Company, LLC | Midland, TX 79701 | Oil Operator | Jul 2024 |
| 176 | Acacia Operating, LLC | | Oil & Gas Operator | Jun 2025 |
| 177 | Acadia Oil Company | Wichita Falls, TX 76309 | Oil & Gas Operator | Sep 2007 |
| 178 | Acadia Oil, LLC | Wichita Falls, TX 76310 | Oil Operator | Oct 2025 |
| 179 | Acadian Gas Pipeline System | | Oil Operator | Jan 2025 |
| 180 | Acadian Land & Expl., Inc. | | Oil & Gas Operator | May 1992 |
| 181 | Acadiana Gas Systems, Inc. | | Oil & Gas Operator | Jan 1999 |
| 182 | Acadiana Reserves, Inc. | | Oil & Gas Operator | Oct 1984 |
| 183 | Acadienergy, Inc. | | Oil & Gas Operator | Jun 1988 |
| 184 | Accell Natural Gas Company | Houston, TX 77042 | Oil & Gas Operator | Sep 1998 |
| 185 | Access Petroleum Corporation | | Oil & Gas Operator | Mar 2015 |
| 186 | Access Resources Inc. | Healdton, OK 73438 | Oil & Gas Operator | Sep 2005 |
| 187 | Accidental Oil Company Inc | Newcastle, WY 82701 | Oil & Gas Operator | Feb 2021 |
| 188 | Accidie Exploration And Dev.,Inc | Plano, TX 75023 | Oil & Gas Operator | Oct 2025 |
| 189 | Acco Oil & Gas Company | Houston, TX 77056 | Oil & Gas Operator | Sep 2001 |
| 190 | Ace Drilling Services, Inc. | | Oil & Gas Operator | Sep 1987 |
| 191 | Ace Energy LLC | Leawood, KS 66211 | Oil & Gas Operator | Jun 2025 |
| 192 | Ace Oil Company | | Oil Operator | Jun 2025 |
| 193 | Ace Production | | Oil Operator | Jul 1993 |
| 194 | Ace Productions | Beaumont, TX 77707 | Oil & Gas Operator | Oct 2025 |
| 195 | Aceco Petroleum Co | Artesia, NM 88210 | Oil & Gas Operator | Sep 2002 |
| 196 | Aceite Energy Corp | | Oil & Gas Operator | Feb 2007 |
| 197 | Aceite Inc | Farmington, NM 87499 | Oil & Gas Operator | Apr 1998 |
| 198 | Acelco Inc | Norman, OK 73070 | Oil & Gas Operator | Oct 1996 |
| 199 | Achen Oil & Gas Inc. | Artesia, NM 88211 | Oil & Gas Operator | Feb 1999 |
| 200 | Achilles Oil, LLC | | Oil & Gas Operator | Jun 2025 |