| 201 | Achilles Oil, LLC | | Oil & Gas Operator | May 2025 |
| 202 | Acierto Resources Company, LLC | Houston, TX 77070 | Oil & Gas Operator | Jul 2025 |
| 203 | Acirema Corporation | Longview, TX 75608 | Oil & Gas Operator | Jul 2025 |
| 204 | Acker, H. E. Well Service | | Oil & Gas Operator | Dec 2007 |
| 205 | Ackerly Service Company, Inc. | Big Spring, TX 79721 | Oil & Gas Operator | Nov 1997 |
| 206 | Ackerman, Albert C. | Boerne, TX 78006 | Oil & Gas Operator | Oct 1995 |
| 207 | Ackley Earl H & Glenora Trust | Cushing, OK 74023-5230 | Oil & Gas Operator | Mar 2015 |
| 208 | Acl Production, LLC | Independence, KS 67301 | Oil Operator | Sep 2017 |
| 209 | Acme Petroleum Co. | Gonzales, TX 78629 | Oil & Gas Operator | Mar 2008 |
| 210 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 211 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Jul 2025 |
| 212 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 213 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2025 |
| 214 | Acoma Oil Corporation | Saint Paul, MN 55102 | Oil & Gas Operator | Jul 2025 |
| 215 | Acoma Operating, LLC | Lubbock, TX 79424 | Oil & Gas Operator | Jul 2025 |
| 216 | Acorn Oil & Gas, Inc. | Orchard, TX 77464 | Oil Operator | Sep 2017 |
| 217 | Acorn Oil & Gas, LLC | Iraan, TX 79744 | Oil & Gas Operator | Jul 2025 |
| 218 | Acott, Melvin E | | Oil Operator | Aug 2014 |
| 219 | Actagon Corp | Monroeville, PA 15146 | Oil & Gas Operator | Dec 2024 |
| 220 | Action Oil Co Inc | Farmington, NM 87499 | Oil Operator | Mar 2021 |
| 221 | Action Petroleum Inc | Atwater, OH 44201 | Oil & Gas Operator | Dec 1986 |
| 222 | Action Petroleum Service Corp | Ardmore, OK 73401 | Oil Operator | Apr 2025 |
| 223 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Jul 2025 |
| 224 | Activa Resources, LTD. | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2008 |
| 225 | Ad Astra Resources LLC | Wichita, KS 67212 | Oil & Gas Operator | May 2025 |
| 226 | Ada Belle Oil & Gas Company | Sourlake, TX 77659 | Oil Operator | Dec 2023 |
| 227 | Ada Energy Exploration And Production LLC | Ada, OK 74820-0867 | Oil Operator | Apr 2025 |
| 228 | Ada Exploration | Olney, TX 76374 | Oil & Gas Operator | Jul 2025 |
| 229 | Ada Oil Exploration Corp | | Oil & Gas Operator | Jan 1986 |
| 230 | Adair E H Oil Co | | Oil & Gas Operator | Aug 1994 |
| 231 | Adair Resources Inc. | Ennis, TX 75120 | Oil & Gas Operator | Apr 2018 |
| 232 | Adair W C & Co Inc. | Logan, OH 43138 | Oil & Gas Operator | Dec 1991 |
| 233 | Adam Petroleum Services, Inc. | | Oil Operator | Aug 1989 |
| 234 | Adam'S Gas Corporation, Inc. | Albert, KS 67511 | Gas Operator | Mar 2004 |
| 235 | Adami Compressor Service | Weatherford, TX 76086 | Gas Operator | Jul 2025 |
| 236 | Adams & McGahey | Amarillo, TX 79114 | Oil & Gas Operator | Nov 1998 |
| 237 | Adams Affiliates, Inc. | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2025 |
| 238 | Adams Branch Exploration Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2002 |
| 239 | Adams Energy LLC | | Oil & Gas Operator | Dec 2021 |
| 240 | Adams Evertte | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 241 | Adams G C Oil & | | Oil & Gas Operator | Nov 1996 |
| 242 | Adams H D LLC | Moorcroft, WY 82721 | Oil & Gas Operator | Jun 2025 |
| 243 | Adams Res & Energy Co | Houston, TX 77001-0844 | Oil & Gas Operator | Mar 2015 |
| 244 | Adams Resources Expl. Corp. | Houston, TX 77001 | Oil & Gas Operator | Apr 2020 |
| 245 | Adams, Frank B | Corpus Christi, TX 78476 | Oil & Gas Operator | Feb 1988 |
| 246 | Adams, K. S. Jr. | Houston, TX 77001 | Gas Operator | Sep 2013 |
| 247 | Adams, Lynn V. | Nocona, TX 76255 | Oil & Gas Operator | Jul 2025 |
| 248 | Adams, R. W. & Son | Amarillo, TX 79109 | Oil & Gas Operator | Oct 1996 |
| 249 | Adams, Robin P. And Nicholas P. Spengler | Evans, NY 14047 | Gas Operator | Dec 2024 |
| 250 | Adams, Ronald D. | Randolph, NY 14772 | Gas Operator | Dec 2024 |
| 251 | Adamson Exploration Co. | Kilgore, TX 75662 | Oil Operator | Jul 2025 |
| 252 | Adamson Exploration Corporation | Kilgore, TX 75662 | Oil & Gas Operator | Mar 2008 |
| 253 | Adamson, Michael A. | Sapulpa, OK 74066 | Oil Operator | Oct 2015 |
| 254 | Adco LTD. | | Oil & Gas Operator | Dec 1983 |
| 255 | Adco Producing Company | | Oil & Gas Operator | Mar 1989 |
| 256 | Adcock, Carol | Ozona, TX 76943 | Oil & Gas Operator | Jul 2025 |
| 257 | Adcock, Leroy | Ozona, TX 76943 | Oil & Gas Operator | Jun 2009 |
| 258 | Add Energy Co | Butler, PA 16002-0471 | Gas Operator | Dec 2020 |
| 259 | Addax Operating, LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Jul 2025 |
| 260 | Addie, James & John Thornton | | Oil & Gas Operator | Dec 2024 |
| 261 | Addington Exploration, LLC | | Oil & Gas Operator | Dec 2006 |
| 262 | Addis Family Tru | | Oil Operator | Apr 1992 |
| 263 | Addis, Icer Estate Of | Wichita, KS 67208 | Gas Operator | Jun 2015 |
| 264 | Addison - Graves, L.L.C. | Archer City, TX 76351 | Oil Operator | Jul 2025 |
| 265 | Addison Oil, LLC | Addison, TX 75001 | Oil & Gas Operator | Mar 2013 |
| 266 | Addison Resources Inc. | | Oil & Gas Operator | Jul 1998 |
| 267 | Addison, Kenneth | Archer City, TX 76351 | Oil & Gas Operator | Dec 2017 |
| 268 | Adeco Energy Corporation | Norman, OK 73071 | Oil & Gas Operator | Apr 2014 |
| 269 | Adeco, Inc. | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 270 | Adela Oil | Seguin, TX 78155 | Oil & Gas Operator | Jun 2000 |
| 271 | Adelaide Energy LLC | FT Morgan, CO 80701 | Oil Operator | Mar 2025 |
| 272 | Adelaide Energy, Inc. | | Oil Operator | May 2022 |
| 273 | Adena Petroleum, Inc. | Vienna, WV 26105 | Oil & Gas Operator | Dec 2021 |
| 274 | Adenryen, LTD. Co. | Richardson, TX 75082 | Oil Operator | Jul 2025 |
| 275 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 276 | Adgo Resources LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2018 |
| 277 | Adkins Jim | Weleetka, OK 74880-8057 | Oil & Gas Operator | Apr 2020 |
| 278 | Adkins Production Co. | | Oil Operator | Aug 2015 |
| 279 | Adkins, Franklin | Ona, WV 25545-0070 | Oil & Gas Operator | Dec 2021 |
| 280 | Adkins, Howard M | Louisa, KY 41230 | Oil Operator | Dec 2023 |
| 281 | Adkins, Michael H. | Austin, TX 78747 | Oil & Gas Operator | Jul 2025 |
| 282 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 283 | Adkins, Russell M & Mary | Louisa, KY 41230 | Oil Operator | Dec 2019 |
| 284 | Adkins, Teddy D. | | Oil & Gas Operator | Dec 2020 |
| 285 | Adler Energy LC | | Oil Operator | May 2017 |
| 286 | Adm Industrial O | | Oil Operator | Nov 1989 |
| 287 | Admiral Bay (USA) Inc. | Centennial, CO 80112 | Gas Operator | Jun 2011 |
| 288 | Admiral Permian Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2025 |
| 289 | Admiral Resource Inc | Broken Arrow, OK 74012 | Oil & Gas Operator | Apr 2020 |
| 290 | Adobe Energy Company | | Oil & Gas Operator | Aug 2010 |
| 291 | Adobe Energy, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Nov 2004 |
| 292 | Adobe Oil & Gas Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 1993 |
| 293 | Adobe Operating Company | Pampa, TX 79066 | Oil & Gas Operator | Jul 2025 |
| 294 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 295 | Adparo LLC | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | May 2025 |
| 296 | Adr Operating, Inc. | Independence, KS 67301 | Oil & Gas Operator | Sep 2013 |
| 297 | Ads | Caldwell, TX 77836 | Oil & Gas Operator | Dec 2010 |
| 298 | Ads Oil & Gas, Inc. | Caldwell, TX 77836 | Oil & Gas Operator | Jul 2025 |
| 299 | Advance Energy Partners Hat Mesa, LLC | Dallas, TX 75240 | Oil & Gas Operator | Jul 2023 |
| 300 | Advance Exploration | Abilene, TX 79601 | Oil & Gas Operator | Jul 2025 |