| 301 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 302 | Keesee Paul Inc | Holdenville, OK 74848 | Oil & Gas Operator | Nov 1998 |
| 303 | Keesun Corporation | Cut Bank, MT 59427 | Oil & Gas Operator | May 2025 |
| 304 | Keft Oil Company | Pleasanton, TX 78064 | Oil & Gas Operator | Feb 2003 |
| 305 | Kehl Oil & Gas Enterprises LLC | Lower Salem, OH 45745 | Oil & Gas Operator | Dec 2024 |
| 306 | Kehler & Kehler Oil Company | Skiatook, OK 74070-3674 | Oil & Gas Operator | Feb 2005 |
| 307 | Keicher Bros. | Cowlesville, NY 14037 | Gas Operator | Dec 2024 |
| 308 | Keirus, Inc. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jul 2025 |
| 309 | Keisling Energy, LLC | Dumas, TX 79029 | Gas Operator | Jul 2025 |
| 310 | Keisling, H. N. | Pampa, TX 79065 | Oil & Gas Operator | Aug 2015 |
| 311 | Keith F. Walker Oil & Gas Co., LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 312 | Keith Lynn Minerals LLC | Springfield, OH 45503 | Oil & Gas Operator | Dec 2024 |
| 313 | Keith McClure | Waynesburg, PA 15370-3636 | Oil & Gas Operator | Dec 2018 |
| 314 | Keith Petroleum Corporation | Houston, TX 77063 | Oil & Gas Operator | Jan 1993 |
| 315 | Keith W. Burton | | Oil & Gas Operator | Jan 2025 |
| 316 | Keith Walker O & G Co LLC | | Oil Operator | May 2025 |
| 317 | Keith, Dennis | Waterville, NY 13480 | Gas Operator | Dec 2024 |
| 318 | Keiths Pumping Service | Douglas, WY 82633 | Oil & Gas Operator | Aug 2003 |
| 319 | Keito Gas Inc | Reno, OH 45773 | Oil & Gas Operator | Dec 2020 |
| 320 | Kelble'S Oil And Gas, LLC | Glenville, WV 26351 | Oil & Gas Operator | Dec 2021 |
| 321 | Kelcas Well Services LTD | Owensboro, KY 42303 | Oil Operator | Dec 2021 |
| 322 | Kelco Petroleum Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2013 |
| 323 | Kele Exploration, Inc. | | Oil & Gas Operator | Apr 1990 |
| 324 | Kellco Energy, LTD. | Houston, TX 77057 | Oil & Gas Operator | Nov 2007 |
| 325 | Kelle Day Oil Producers Inc | Braman, OK 74632-9147 | Oil & Gas Operator | Dec 2023 |
| 326 | Kelle Lambing Production Co | Braman, OK 74632-0132 | Oil & Gas Operator | Nov 2014 |
| 327 | Keller Brothers & Co | Nelsonville, OH 45764 | Oil Operator | Dec 2019 |
| 328 | Keller Estate Leases LLC | Bartlesville, OK 74003-3608 | Oil Operator | Aug 2012 |
| 329 | Keller Heirs Oil | | Oil Operator | Aug 2024 |
| 330 | Keller, Michael F. & Sharon Kay Ritchie | Alden, NY 14004 | Gas Operator | Dec 2024 |
| 331 | Kellerville Operating, LLC | Pampa, TX 79065 | Oil & Gas Operator | Jul 2025 |
| 332 | Kelley Edgar Oil & Gas Operations | | Gas Operator | Nov 2015 |
| 333 | Kelley Industries, Inc. | Waynesboro, MS 39367 | Oil & Gas Operator | Jul 2005 |
| 334 | Kelley James C Estate | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 335 | Kelley Oil & Gas | McAlester, OK 74570 | Oil & Gas Operator | May 2013 |
| 336 | Kelley Oil & Sugar Creek Prod. | | Oil & Gas Operator | Oct 1992 |
| 337 | Kelley Oil Corp/Yuma Petroleum | | Gas Operator | Jun 1994 |
| 338 | Kelley Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Jan 2002 |
| 339 | Kelley Operating Company, LTD. | | Oil & Gas Operator | Aug 2003 |
| 340 | Kelley, Joseph R | | Oil & Gas Operator | Apr 2025 |
| 341 | Kelley, Randall R. Dba VIctory Construction | | Gas Operator | Dec 2021 |
| 342 | Kellogg Oil Company | Henryetta, OK 74437 | Oil & Gas Operator | Oct 2024 |
| 343 | Kellogg, Nicole | Bergen, NY 14416 | Gas Operator | Dec 2024 |
| 344 | Kelloil Inc | Fort Worth, TX 76116-5600 | Oil & Gas Operator | Mar 2015 |
| 345 | Kellous Oil, Inc | | Oil Operator | Dec 2013 |
| 346 | Kelly Bayou Production | | Oil & Gas Operator | Jan 2025 |
| 347 | Kelly Company LC | Lenexa, KS 67215 | Oil & Gas Operator | Mar 2025 |
| 348 | Kelly Cook Oil LLC | Shawnee, OK 74804-3148 | Oil & Gas Operator | Apr 2025 |
| 349 | Kelly Energy Co, Inc | Henderson, KY 42420 | Oil Operator | Dec 2022 |
| 350 | Kelly H. Baxter | Austin, TX 78767 | Oil & Gas Operator | Nov 2006 |
| 351 | Kelly James O | | Oil & Gas Operator | Apr 2000 |
| 352 | Kelly James O Dba Kelly Oil Co | | Oil & Gas Operator | Aug 1987 |
| 353 | Kelly Jr Walter A Opr Co | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2014 |
| 354 | Kelly Mahler Operating, LLC | Graham, TX 76450 | Oil Operator | Jul 2025 |
| 355 | Kelly Oil | Tulsa, OK 74105 | Oil Operator | Dec 2000 |
| 356 | Kelly Oil And Gas Inc | | Oil & Gas Operator | Mar 1999 |
| 357 | Kelly Oil Company | | Oil & Gas Operator | Sep 2013 |
| 358 | Kelly Operating Company | | Oil & Gas Operator | Oct 1991 |
| 359 | Kelly Resources, LTD. | Frisco, TX 75034 | Oil & Gas Operator | Aug 2004 |
| 360 | Kelly, Michael | Perry, NY 14530 | Gas Operator | Dec 2024 |
| 361 | Kelly, Michael J. | Spencer, WV 25876-0000 | Oil & Gas Operator | Dec 2021 |
| 362 | Kelmac Production Company | Braman, OK 74632-0132 | Oil Operator | Apr 2003 |
| 363 | Kelmar Oil Company | Chickasha, OK 73018 | Oil & Gas Operator | Mar 2025 |
| 364 | Kelpetro Operating Inc. | | Oil & Gas Operator | Dec 2021 |
| 365 | Kelpetro, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2012 |
| 366 | Kelsey Operating, Inc. | Houston, TX 77077 | Oil Operator | Feb 2022 |
| 367 | Kelso Casing Pul | | Oil Operator | Mar 1995 |
| 368 | Kelso Casing Pulling Of MS Inc | | Oil & Gas Operator | Dec 1993 |
| 369 | Kelso Oil LLC | Chase, KS 67524 | Oil & Gas Operator | Apr 2007 |
| 370 | Kelso, Mike Oil | Chase, KS 67524 | Oil Operator | Oct 2013 |
| 371 | Kelt Energy Inco | | Oil & Gas Operator | Sep 1995 |
| 372 | Kelt Energy, Inc. | Independence, KS 67301 | Oil & Gas Operator | Dec 2003 |
| 373 | Kelt Oil & Gas | Houston, TX 77060 | Oil & Gas Operator | Dec 1998 |
| 374 | Kelt Oil & Gas, Inc. | Torrance, CA 90503 | Oil & Gas Operator | Dec 2003 |
| 375 | Kelton Co. | | Oil Operator | Dec 1964 |
| 376 | Kelton Oil & Gas Co | Wheeler, TX 79096 | Oil Operator | Jun 1991 |
| 377 | Kelton Operating Co., Inc. | | Oil Operator | Jul 1991 |
| 378 | Kelton, B.J. | Rosharon, TX 77583 | Oil & Gas Operator | Jul 2025 |
| 379 | Kem Energy Us ,LLC | | Oil & Gas Operator | Dec 2023 |
| 380 | Kem Energy, Inc. | Katy, TX 77450 | Oil & Gas Operator | Jul 2025 |
| 381 | Kem Enterprise Inc. | | Oil & Gas Operator | Apr 2025 |
| 382 | Kem Ventures, LP | Katy, TX 77450 | Oil & Gas Operator | May 2025 |
| 383 | Kema Oil Company, Inc. | Lebo, KS 66856 | Oil Operator | Mar 2025 |
| 384 | Kemco Oil | Alice, TX 78332 | Oil & Gas Operator | Aug 2009 |
| 385 | Kemmerer Coal Co | | Oil & Gas Operator | Dec 1981 |
| 386 | Kemmerer Company Inc | Tulsa, OK 74136-7027 | Oil & Gas Operator | Feb 2025 |
| 387 | Kemp Roy L | | Oil Operator | Jan 2011 |
| 388 | Kemp, Walter | Talpa, TX 76882 | Gas Operator | Jul 2025 |
| 389 | Kemper Operating Co. | Abilene, TX 79605 | Oil & Gas Operator | Nov 2015 |
| 390 | Ken Petroleum Corporation | Dallas, TX 75206 | Oil & Gas Operator | Feb 2019 |
| 391 | Ken Snyder Inc | Newalla, OK 74857-7107 | Oil & Gas Operator | Apr 2025 |
| 392 | Ken-Cas Oil Co. | Levelland, TX 79336 | Oil & Gas Operator | Apr 1998 |
| 393 | Kenai Oil & Gas Inc | | Oil & Gas Operator | Jun 1987 |
| 394 | Kenbill Oil Comp | | Oil Operator | Jun 1994 |
| 395 | Kendall-Davis DRLG Co, Inc | | Oil Operator | Dec 2023 |
| 396 | Kendol Exploration Inc | Oklahoma City, OK 73105-2513 | Oil & Gas Operator | Mar 2025 |
| 397 | Kendrick Enterprises, Inc. | Burleson, TX 76028 | Oil Operator | Jun 1985 |
| 398 | Kendrick Oil And Gas Company | Abilene, TX 79608 | Oil & Gas Operator | Jul 2025 |
| 399 | Kendrick Oil Co. | Abilene, TX 79608 | Oil & Gas Operator | Mar 2008 |
| 400 | Kendrick, Barbara S. | Baytown, TX 77521 | Oil Operator | Jul 2025 |