| 301 | Jack Markham | Lubbock, TX 79401 | Oil & Gas Operator | Dec 2015 |
| 302 | Jack Moran Oil Co | Martinsburg, OH 43037 | Oil & Gas Operator | Dec 2009 |
| 303 | Jack Oil Company | Baird, TX 79504 | Oil & Gas Operator | Apr 1994 |
| 304 | Jack Oil Company L.L.C. | Duncan, OK 73533 | Oil & Gas Operator | Dec 2025 |
| 305 | Jack Production Inc | Indiana, PA 15701-0697 | Oil & Gas Operator | Dec 2011 |
| 306 | Jack Russell Oil, LLC | Fairfield, TX 75840 | Oil & Gas Operator | Feb 2026 |
| 307 | Jack Showacre | | Oil Operator | Jun 2002 |
| 308 | Jack T. Everett | | Oil & Gas Operator | Jan 2006 |
| 309 | Jack Taunton Energy | | Oil Operator | May 2002 |
| 310 | Jack Todd-Despot Expl., Inc. | | Oil & Gas Operator | Apr 1985 |
| 311 | Jack W Sanders & Son, General Partnership | Wellsville, KS 66092 | Oil Operator | Dec 2024 |
| 312 | Jack W. Grigsby | | Oil & Gas Operator | Sep 2001 |
| 313 | Jackass Flats Oil & Gas Co | Edmond, OK 73013 | Gas Operator | Jan 2015 |
| 314 | Jackie D Nelson | | Oil & Gas Operator | Sep 1983 |
| 315 | Jackknife Oil | Longton, KS 67352 | Oil Operator | Apr 1989 |
| 316 | Jackman & Jackma | | Oil Operator | Jan 1986 |
| 317 | Jacks Creek Oil & Gas-W T Lindsey, Agent | Pikeville, KY 41501 | Gas Operator | Dec 2023 |
| 318 | Jackson & Richardson, Inc | Lafollette, TN 37766 | Gas Operator | Dec 2023 |
| 319 | Jackson Bros. | Vernon, TX 76384 | Oil & Gas Operator | Jul 2016 |
| 320 | Jackson Brothers | | Oil Operator | Dec 1996 |
| 321 | Jackson Brothers, L.L.C. | Eureka, KS 67045 | Oil Operator | Sep 2025 |
| 322 | Jackson Donald W Trust | Blue Eye, MO 65611-7293 | Gas Operator | Aug 2015 |
| 323 | Jackson Dorwin R | | Oil Operator | Sep 1995 |
| 324 | Jackson Emma Trust | Duncan, OK 73534-1388 | Oil & Gas Operator | Oct 2016 |
| 325 | Jackson Energy Development, Inc. | Cedar Park, TX 78613 | Oil & Gas Operator | Feb 2026 |
| 326 | Jackson Exploration Inc | Dallas, TX 75225 | Oil & Gas Operator | Aug 2005 |
| 327 | Jackson Fuel Corporation | Buckhannon, WV 26201 | Oil & Gas Operator | Dec 2021 |
| 328 | Jackson Investments | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 329 | Jackson J M | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2005 |
| 330 | Jackson John J | | Oil Operator | Nov 1993 |
| 331 | Jackson L B Production Co | Tulsa, OK 74193-0001 | Oil & Gas Operator | Aug 2013 |
| 332 | Jackson Oil | Powell, TX 75153 | Oil & Gas Operator | Feb 2026 |
| 333 | Jackson Oil & Gas | Abilene, TX 79602 | Oil & Gas Operator | Dec 2001 |
| 334 | Jackson Oil Company | Ranger, TX 76470 | Oil & Gas Operator | Sep 1998 |
| 335 | Jackson Oilfield Service Inc | Purcell, OK 73080-4357 | Oil & Gas Operator | Jan 2021 |
| 336 | Jackson Petroleum Co., Inc. | | Oil & Gas Operator | Feb 2010 |
| 337 | Jackson Petroleum Consult Inc | Dallas, TX 75287 | Oil & Gas Operator | Aug 1994 |
| 338 | Jackson Petroleum Consulting,Inc | Plano, TX 75075 | Oil & Gas Operator | Sep 2019 |
| 339 | Jackson Production Co. | Rockdale, TX 76567 | Oil & Gas Operator | Mar 2008 |
| 340 | Jackson Resources Co | | Oil & Gas Operator | Dec 2018 |
| 341 | Jackson Well Service | | Oil Operator | Apr 2001 |
| 342 | Jackson, Brian & Janet | Elsmore, KS 66732 | Oil Operator | Jun 2025 |
| 343 | Jackson, D. L., & Son | Jacksboro, TX 76458 | Oil & Gas Operator | May 2001 |
| 344 | Jackson, Donald W. | Borger, TX 79008 | Oil & Gas Operator | Dec 2001 |
| 345 | Jackson, Howard Dba Jackson Enterprises | Williamsburg, KY 40769 | Oil & Gas Operator | Dec 2023 |
| 346 | Jackson, Jeral W. Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2004 |
| 347 | Jackson, Joshua And Reacreisha | Mapleton, KS 66754 | Oil Operator | Jun 2025 |
| 348 | Jackson, Levi | Mound City, KS 66056 | Oil Operator | Aug 2025 |
| 349 | Jackson, Michael, Jackson Cheryl, Wallace, Thomas | Wellsville, NY 14895 | Oil & Gas Operator | Dec 2024 |
| 350 | Jackson, Neil A. | Snyder, TX 79549 | Oil & Gas Operator | Dec 1993 |
| 351 | Jackson, Norville W & Charlotte L | | Oil & Gas Operator | Dec 2010 |
| 352 | Jacky G. Rivers | | Oil & Gas Operator | Jan 2025 |
| 353 | Jaco Energy Company Inc | Stigler, OK 74462 | Gas Operator | Nov 2025 |
| 354 | Jaco Oil & Gas | Borger, TX 79008 | Oil & Gas Operator | Feb 2026 |
| 355 | Jaco Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Apr 1998 |
| 356 | Jaco Production Company | Bakersfield, CA 93380 | Oil Operator | Nov 2025 |
| 357 | Jaco, Troy Inc. | Sherman, TX 75091 | Oil & Gas Operator | Feb 2026 |
| 358 | Jacobi-Johnson Energy, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 1998 |
| 359 | Jacobs Fred T | | Oil Operator | Apr 1991 |
| 360 | Jacobs Jean | Hurdle Mills, NC 27541 | Oil & Gas Operator | May 2013 |
| 361 | Jacobs, C. E., Co. | Albany, TX 76430 | Oil & Gas Operator | Sep 2022 |
| 362 | Jacobs, Gary D. | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2016 |
| 363 | Jacobs, R L Oil & Gas Co | Grand Junction, CO 81503 | Oil & Gas Operator | Oct 1986 |
| 364 | Jacobsen Michael | | Oil Operator | Dec 1996 |
| 365 | Jacobus, R H | | Oil Operator | Dec 2023 |
| 366 | Jad Oil, Inc. | Hallettsville, TX 77964 | Oil & Gas Operator | Feb 2026 |
| 367 | Jad Petroleum Corporation | Colorado Springs, CO 80906 | Oil & Gas Operator | Aug 1998 |
| 368 | Jada Inc. | | Oil & Gas Operator | Jul 2013 |
| 369 | Jadath | | Oil Operator | May 2001 |
| 370 | Jadco Energy Inc | Newcomerstown, OH 43832 | Oil & Gas Operator | Dec 2023 |
| 371 | Jade Enterprises, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 372 | Jade Petroleum C | | Oil & Gas Operator | Mar 1985 |
| 373 | Jade Petroleum Inc. | | Oil & Gas Operator | May 1998 |
| 374 | Jade Resources I | | Gas Operator | Jan 1989 |
| 375 | Jade Resources, Inc. | Englewood, CO 80112 | Oil Operator | Jul 1998 |
| 376 | Jadoil Inc D Vernau | Newark, OH 43055 | Oil & Gas Operator | Dec 1990 |
| 377 | Jae Exploration & Development | | Oil & Gas Operator | Sep 1993 |
| 378 | Jaed Oil Production Co Inc | Arkansas City, KS 67005-0902 | Oil & Gas Operator | Mar 2015 |
| 379 | Jaed Production Co., | Arkansas City, KS 67005 | Oil & Gas Operator | Mar 2024 |
| 380 | Jag Operating, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2019 |
| 381 | Jag Petroleum LLC | Houston, TX 77058 | Oil Operator | Nov 2009 |
| 382 | Jag Pva Re-Development, LLC | | Oil Operator | Dec 2024 |
| 383 | Jagged Peak Energy LLC | Oklahoma City, OK 73126 | Oil & Gas Operator | Feb 2026 |
| 384 | Jagger Oil LLC | Konawa, OK 74849 | Oil & Gas Operator | Dec 2025 |
| 385 | Jaguar Energy LLC | | Oil & Gas Operator | Jun 2022 |
| 386 | Jaguar Oil, LLC | Evansville, IN 47713 | Oil Operator | Dec 2022 |
| 387 | Jaguar Petroleum | | Oil Operator | Jul 1994 |
| 388 | Jai Oil | Lucien, OK 73757 | Oil & Gas Operator | Nov 2025 |
| 389 | Jaid Energy, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 390 | Jakd Solutions, LLC | Farmington, NM 87401 | Oil & Gas Operator | Dec 2025 |
| 391 | Jake Energy LLC | Prague, OK 74864 | Oil & Gas Operator | Jul 2021 |
| 392 | Jake L. Hamon | | Oil & Gas Operator | Dec 1983 |
| 393 | Jake Oil, LLC | Billings, MT 59101 | Oil Operator | Feb 2022 |
| 394 | Jake'S Oil Co. | | Oil Operator | Oct 2019 |
| 395 | Jakmen Inc | Edmond, OK 73034-5313 | Oil & Gas Operator | Jun 2015 |
| 396 | Jako Productions | | Oil Operator | Jul 2014 |
| 397 | Jalapeno Corporation | Albuquerque, NM 87103 | Oil & Gas Operator | Dec 2023 |
| 398 | Jalapeno Operating Company, LLC | Plntersville, TX 77363 | Oil Operator | Sep 2025 |
| 399 | Jam Oil LLC | Roswell, NM 88202 | Oil Operator | Jun 2017 |
| 400 | Jamar Operating, L.L.C. | | Oil & Gas Operator | Feb 2016 |