| 301 | Adventure Operating Company, LLC | Midland, TX 79702 | Oil & Gas Operator | Jan 2021 |
| 302 | Adventure Properties Inc | Seminole, OK 74868-1296 | Oil & Gas Operator | Jan 2024 |
| 303 | Aec Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | May 2004 |
| 304 | Aec Operating Company | Roswell, NM 88202 | Oil & Gas Operator | Sep 2006 |
| 305 | Aed Development Inc | Columbus, OH 43220 | Oil & Gas Operator | Dec 1995 |
| 306 | Aeg Operating, LLC | Austin, TX 78746 | Oil Operator | Jun 2012 |
| 307 | Aegean Petroleum | | Oil Operator | Mar 1982 |
| 308 | Aegis Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Sep 1998 |
| 309 | Aegis Fluids Management, LLC | Plano, TX 75093 | Oil & Gas Operator | Apr 2024 |
| 310 | Aei Corp. - Okla. | | Oil & Gas Operator | Sep 2014 |
| 311 | Aei Production Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 2014 |
| 312 | Aeon Energy Corp | | Oil & Gas Operator | Feb 2024 |
| 313 | Aeon Energy Inc | Claremore, OK 74017 | Oil Operator | May 2009 |
| 314 | Aeon Operating, Inc. | Fate, TX 75132 | Oil & Gas Operator | Apr 2024 |
| 315 | Aera Energy LLC | | Oil & Gas Operator | Dec 2023 |
| 316 | Aerie Energy | Cedar Creek, TX 78612 | Oil Operator | Apr 2024 |
| 317 | Aesir Energy | | Oil Operator | Oct 2007 |
| 318 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Apr 2024 |
| 319 | Aethon I LP | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 320 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2024 |
| 321 | Af Operating, LLC | Tuscaloosa, AL 35404 | Oil Operator | Sep 2012 |
| 322 | Afco Energy Prod Co | Indiana, PA 15701-0538 | Oil & Gas Operator | Dec 2019 |
| 323 | Afe Management Limited | Concord, Ontario, L4K 4G4 | Oil & Gas Operator | Sep 1987 |
| 324 | Afe Oil & Gas Consultants | Addison, TX 75001 | Gas Operator | Jan 2003 |
| 325 | Affiliated Holdings, Inc. | | Oil Operator | Dec 2010 |
| 326 | Afg Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 327 | Afo LLC | Velma, OK 73491-0155 | Oil & Gas Operator | Dec 2023 |
| 328 | Agape Energy Inc. | San Antonio, TX 78280 | Oil Operator | Apr 2024 |
| 329 | Agape Inc | Broken Arrow, OK 74011-4256 | Oil & Gas Operator | Jan 2024 |
| 330 | Agape Service Incorporated | Denver, CO 80201 | Gas Operator | Dec 2023 |
| 331 | Agar & Agar Inc | Norman, OK 73070 | Oil & Gas Operator | Oct 1996 |
| 332 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 333 | Agave Energy, Inc | Stigler, OK 74462 | Oil & Gas Operator | Jan 2024 |
| 334 | Agave Operating Company, Inc. | Holliday, TX 76366 | Oil Operator | Apr 2024 |
| 335 | Agent Oil Corporation | Bison, OK 73720-0116 | Oil & Gas Operator | Mar 2005 |
| 336 | Ageron Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Apr 2024 |
| 337 | Ageron Ironroc Energy, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Aug 2023 |
| 338 | Agey Petroleum Co. | | Oil & Gas Operator | Dec 1998 |
| 339 | Aggie Oil Company | Lakewood, CO 80226 | Oil & Gas Operator | May 2001 |
| 340 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 341 | Aghorn Operating, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Apr 2024 |
| 342 | Agip Petroleum Co., Inc. | | Oil & Gas Operator | Jan 2003 |
| 343 | Agp Energy Services LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2024 |
| 344 | Agri-Acres Inc | Billings, MT 59103 | Oil Operator | Jun 1996 |
| 345 | Agricultural Energy Services | Edmond, OK 73003 | Oil & Gas Operator | Dec 2023 |
| 346 | Agricultural Energy Services Inc | Edmond, OK 73003 | Oil Operator | Jan 2024 |
| 347 | Agroil, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2024 |
| 348 | Agua Sucia LLC | Lovington, NM 88260 | Oil & Gas Operator | Jul 2018 |
| 349 | Aguila Operating Company LLC | | Oil & Gas Operator | Jan 2024 |
| 350 | Agv Corp. | Attica, KS 67009 | Oil & Gas Operator | Dec 2023 |
| 351 | Ahabb Oil | Luling, TX 78648 | Oil & Gas Operator | Dec 1998 |
| 352 | Aiello Bros Oil & Gas Inc | Bradford, PA 16701-2925 | Oil & Gas Operator | Dec 2022 |
| 353 | Aikens, Scott E. | Clymer, NY 14724 | Gas Operator | Dec 2022 |
| 354 | Aikins Drilling Company | Mohave Valley, AZ 86440 | Oil Operator | Dec 2019 |
| 355 | Aikman Bros Corp | | Oil & Gas Operator | Mar 2015 |
| 356 | Aikman Brothers LLC | Amarillo, TX 79109 | Oil & Gas Operator | Dec 2023 |
| 357 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Apr 2024 |
| 358 | Ailey A C | Stroud, OK 74079-9209 | Oil & Gas Operator | Nov 2021 |
| 359 | Aim Consultants Inc. | Rockville, MD 20852 | Oil & Gas Operator | Mar 2008 |
| 360 | Aim Energy LLC | North Canton, OH 44720 | Oil & Gas Operator | Dec 2023 |
| 361 | Ainsworth Operat | | Oil Operator | Apr 1995 |
| 362 | Ainsworth Operating Co. | Salem, OR 97302 | Oil Operator | Dec 2023 |
| 363 | Ainsworth Prod Co. | | Oil Operator | Aug 1986 |
| 364 | Ainsworth Rig Service, LLC | | Oil Operator | Dec 2023 |
| 365 | Ainsworth, Otis | | Oil & Gas Operator | Jun 1987 |
| 366 | Airdale Oil & Gas LLC | Oil City, PA 16301-3771 | Oil & Gas Operator | Dec 2023 |
| 367 | Aix Energy Inc | | Oil & Gas Operator | Jul 2016 |
| 368 | Aix Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 369 | Aj Oil And Gas Exploration Inc | Buffalo, NY 14221 | Oil Operator | Dec 2022 |
| 370 | Aj Oil, Inc. | Springfield, LA 70462 | Oil Operator | Oct 2019 |
| 371 | Aj'S Pump Truck Service, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Apr 2024 |
| 372 | Ajar International, Inc. | Randolph, NY 14772 | Gas Operator | Dec 2022 |
| 373 | Ajax Oil & Gas C | | Oil & Gas Operator | Jun 1989 |
| 374 | Ajax Oil Company | Billings, MT 59103 | Oil & Gas Operator | Dec 2003 |
| 375 | Ajax Resources, LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 376 | Ajb Oil LLC | | Oil Operator | Dec 2023 |
| 377 | Ak Operating Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 378 | Ak Pearson Family Trust | Amarillo, TX 79114 | Oil Operator | Apr 2024 |
| 379 | Akandas, Inc. | Chanute, KS 66720 | Oil Operator | Aug 2002 |
| 380 | Akea, Inc. | Holliday, TX 76366 | Oil Operator | Apr 2024 |
| 381 | Aker Oil & Gas Company | Tulsa, OK 74105-2216 | Oil & Gas Operator | Aug 2013 |
| 382 | Akers & Fultz, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2003 |
| 383 | Akers, B. F. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 384 | Akers, Bill | Hebbronville, TX 78361 | Oil & Gas Operator | Aug 2003 |
| 385 | Akg Operating Company | Austin, TX 78701 | Oil & Gas Operator | Apr 2024 |
| 386 | Akin Beene Resources LLC | | Oil & Gas Operator | May 2016 |
| 387 | Akin Jr Verna M & Emsley F | Maud, OK 74854 | Oil & Gas Operator | Apr 2002 |
| 388 | Akins Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 389 | Akma, Inc. | Ore City, TX 75683 | Oil & Gas Operator | Apr 1999 |
| 390 | Akron Central School District | Akron, NY 14001 | Gas Operator | Dec 2022 |
| 391 | Akron Oil Corp | Hackensack, NJ 7602 | Oil & Gas Operator | Dec 1989 |
| 392 | Aksarben Petroleum, Inc. | | Oil Operator | Sep 2022 |
| 393 | Al & D.L. Chiles | | Oil & Gas Operator | Jul 1991 |
| 394 | Al Chiles II | | Oil Operator | Jan 2024 |
| 395 | Al Merit Energy Co., Inc. | | Oil & Gas Operator | Jun 2015 |
| 396 | Al-La-Lyn Oil, Inc. | Ellis, KS 67637 | Oil Operator | Nov 2003 |
| 397 | Alacia Operating Company | Freer, TX 78357 | Oil & Gas Operator | Apr 2024 |
| 398 | Aladdin Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 1999 |
| 399 | Aladdin Petroleu | | Oil & Gas Operator | Nov 1995 |
| 400 | Aladdin Petroleum Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jan 2021 |