| 301 | K & D Energy | | Oil Operator | Dec 2018 |
| 302 | K-B Oil Company | Dallas, TX 75243 | Oil & Gas Operator | Dec 2020 |
| 303 | K. Petroleum, Inc. | Gahanna, OH 43230 | Oil & Gas Operator | Mar 2025 |
| 304 | Kanik, Anthony S Dba Kanik Oil Co | McLeansboro, IL 62859 | Oil Operator | Dec 2023 |
| 305 | Kelcas Well Services LTD | Owensboro, KY 42303 | Oil Operator | Dec 2021 |
| 306 | Kellous Oil, Inc | | Oil Operator | Dec 2013 |
| 307 | Kelly Energy Co, Inc | Henderson, KY 42420 | Oil Operator | Dec 2022 |
| 308 | Kendall-Davis DRLG Co, Inc | | Oil Operator | Dec 2023 |
| 309 | Keneco, Inc | | Oil & Gas Operator | Dec 2018 |
| 310 | Kenneth R Ingle Associates Inc | | Oil Operator | Dec 2023 |
| 311 | Kentucky Exploration LLC | Lexington, KY 40509 | Oil & Gas Operator | Dec 2014 |
| 312 | Kentucky Gas Development, LLC | | Oil & Gas Operator | Dec 2020 |
| 313 | Kentucky Petroleum Operating, LTD | | Oil & Gas Operator | Dec 2017 |
| 314 | Key Oil Company | Duncan, OK 73533 | Oil & Gas Operator | Dec 2021 |
| 315 | Killian, Jeffrey M | Bowling Green, KY 42101 | Oil & Gas Operator | Dec 2023 |
| 316 | Kinzer, J. W. | | Oil & Gas Operator | Dec 2006 |
| 317 | Kirby & Son Dozing | Lewisburg, KY 42256 | Oil Operator | Dec 2023 |
| 318 | KLC Petroleum Company, LLC | Henderson, KY 42420 | Oil Operator | Dec 2021 |
| 319 | Kraft, R L | | Oil Operator | Dec 2023 |
| 320 | Kruckenberg & Scott | Isabel, KS 67065 | Oil Operator | Dec 2011 |
| 321 | KV Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2006 |
| 322 | KWR Ventures LLC | Harrisburg, IL 62946 | Oil Operator | Dec 2023 |
| 323 | Ky Crude LLC | Bowling Green, KY 42103 | Oil Operator | Dec 2021 |
| 324 | Ky Energy Group, LLC | | Oil & Gas Operator | Dec 2015 |
| 325 | Ky Ohio Gas Co | | Oil Operator | Dec 2021 |
| 326 | Ky-Tenn Expl Co, Inc | New Concord, OH 43762 | Oil & Gas Operator | Dec 2023 |
| 327 | Kytx Oil & Gas, LLC | Gray, KY 40734 | Oil & Gas Operator | Dec 2021 |
| 328 | L & B Oil & Gas, Inc | Harold, KY 41635 | Oil & Gas Operator | Dec 2023 |
| 329 | L. A. W. Oil, LLC | | Oil Operator | Dec 2018 |
| 330 | Lamar Properties | Evansville, IN 47716 | Gas Operator | Dec 2023 |
| 331 | Last Ditch Petroleum LLC | Edmonton, KY 42129 | Oil Operator | Dec 2023 |
| 332 | Latham, Richard K | Lewisburg, KY 42256 | Oil Operator | Dec 2022 |
| 333 | Lawrence County Gas LLC | Salyersville, KY 41465 | Oil & Gas Operator | Dec 2023 |
| 334 | Lear Oil, LLC | Junction City, KY 40440 | Oil Operator | Dec 2023 |
| 335 | Legacy Oil, LLC | Falls Of Rough, KY 40119 | Oil Operator | Dec 2023 |
| 336 | Legg, Raymond | | Oil Operator | Dec 2010 |
| 337 | Lewis, Freddie | | Oil Operator | Dec 2023 |
| 338 | Liberty National Corp | Dallas, TX 75206 | Oil Operator | Dec 2006 |
| 339 | Licking Valley Construction Co., Inc. | | Oil & Gas Operator | Dec 2016 |
| 340 | Lincoln Energy Corporation | Dennis, MA 02638 | Oil & Gas Operator | Dec 2021 |
| 341 | Lindsey, W W | Pikeville, KY 41501 | Oil & Gas Operator | Dec 2023 |
| 342 | Lindsey, W W & Elliott, W E | | Oil & Gas Operator | Dec 2023 |
| 343 | Lindsey, W W & Elliott, W E Dba Lindsey & Elliott | | Oil & Gas Operator | Dec 2023 |
| 344 | Lindsey, W W Et Al | | Gas Operator | Dec 2023 |
| 345 | Loeb Bros., LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2016 |
| 346 | Loeb, Herman L, LLC | Lawrenceville, IL 62439 | Oil Operator | Dec 2017 |
| 347 | Lone Star Oil & Gas, Inc | Greenville, KY 42345 | Oil & Gas Operator | Dec 2023 |
| 348 | Louisville Gas & Electric Co | Louisville, KY 40241 | Oil Operator | Dec 2023 |
| 349 | Lowe, Wallace W | | Oil Operator | Dec 2013 |
| 350 | Lucky Run, LLC | | Oil Operator | Dec 2019 |
| 351 | Lyle Energy & Development, Inc | | Oil Operator | Dec 2008 |
| 352 | Madison Brothers Investment, LLC | Brownsville, KY 42210 | Oil & Gas Operator | Dec 2023 |
| 353 | Magnum DRLG Of Ohio, Inc | Ashland, KY 41102 | Oil & Gas Operator | Dec 2023 |
| 354 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 355 | Magnum Oil, LLC | Hartford, KY 42347 | Oil Operator | Dec 2023 |
| 356 | Maier, H Paul | | Oil Operator | Dec 2023 |
| 357 | Majestic Management Corp | | Oil Operator | Dec 2013 |
| 358 | Marco Oil Co, Inc | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 359 | Marsh Oil & Gas Field Services, Inc | Sebree, KY 42455 | Oil & Gas Operator | Dec 2023 |
| 360 | Massie, Everett J | Philpot, KY 42366 | Oil Operator | Dec 2023 |
| 361 | Matriks Energy LLC | Ashland, KY 41102 | Gas Operator | Dec 2021 |
| 362 | Maxim Energy Inc Dba Maxim Tep Inc | | Oil Operator | Dec 2009 |
| 363 | Maximum Energy Development, LLC | Glasgow, KY 42142 | Oil Operator | Dec 2022 |
| 364 | Maximum Oil & Gas, Inc | | Gas Operator | Dec 2023 |
| 365 | MBM Production, LLC | Pikeville, KY 41501 | Oil & Gas Operator | Dec 2023 |
| 366 | MC Oil, LLC | Morganfield, KY 42437 | Oil Operator | Dec 2023 |
| 367 | McWhorter, Jimmy L | Louisville, KY 40218 | Oil Operator | Dec 2023 |
| 368 | MDM Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | May 2025 |
| 369 | Meng, Charles H | Lexington, KY 40502 | Gas Operator | Dec 2023 |
| 370 | Mercury Petroleum Company, Inc | | Oil Operator | Dec 2018 |
| 371 | Meridian Resources, LLC | Evansville, IN 47715 | Oil Operator | Jul 2024 |
| 372 | Metgas Co, A Partnership | | Oil & Gas Operator | Dec 2016 |
| 373 | Miami Oil Producers Inc | Reno, NV 89501 | Oil & Gas Operator | Dec 2012 |
| 374 | Midway City Gas Company | Huntington, WV 25701 | Oil & Gas Operator | Dec 2018 |
| 375 | Midwest Radiant Oil & Gas Co | | Oil Operator | Dec 2021 |
| 376 | Mieka LLC | Flower Mound, TX 75028-7446 | Oil & Gas Operator | Dec 2014 |
| 377 | Miller Energy Technologies, LLC | Lexington, KY 40509 | Oil Operator | Dec 2023 |
| 378 | Miller, Luke A | Keaton, KY 41226 | Oil Operator | Dec 2023 |
| 379 | Mills Boys Oil And Gas Leasing, LLC | | Oil Operator | Dec 2023 |
| 380 | Minerals MGMT Group, Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2021 |
| 381 | Mollett Oil Productions, LLC | Thelma, KY 41260 | Oil Operator | Dec 2020 |
| 382 | Montgomery Oil Co | | Oil Operator | Dec 2018 |
| 383 | Moran, F E Oil Co | Evansville, IN 47715 | Oil Operator | Dec 2015 |
| 384 | Morgan, Robert L | | Oil Operator | Dec 2017 |
| 385 | Mountain DRLG, Inc | Hindman, KY 41822 | Oil & Gas Operator | Dec 2023 |
| 386 | MSD Energy, Inc | Rapid City, SD 57702 | Oil & Gas Operator | Dec 2020 |
| 387 | Mud River Oil & Gas, LLC | Rochester, KY 42273 | Oil Operator | Dec 2023 |
| 388 | Musgrave, Dalton | | Oil Operator | Dec 2020 |
| 389 | Nally, Joseph L | Uniontown, KY 42461 | Oil & Gas Operator | Dec 2021 |
| 390 | Nami Resources Company, LLC | | Oil & Gas Operator | Dec 2023 |
| 391 | Navitas Land And Mineral Development, LLC | | Oil Operator | Dec 2016 |
| 392 | Nelson Ent | | Oil Operator | Dec 2016 |
| 393 | New River Energy Corporation | | Gas Operator | Dec 2017 |
| 394 | Newport Oil Corporation | Clearwater, FL 33755 | Oil & Gas Operator | Jul 2011 |
| 395 | Nichols Oil Co. | Holliday, TX 76366 | Oil & Gas Operator | May 2025 |
| 396 | Nichols Operating LLC | Fort Branch, IN 47648 | Oil & Gas Operator | Dec 2021 |
| 397 | Nolin Rural Electric Coop | Elizabethtown, KY 42701 | Gas Operator | Dec 2023 |
| 398 | Norwood Energy, Inc | | Oil Operator | Dec 2015 |
| 399 | Noxxe | Ottawa, KS 66067 | Oil & Gas Operator | Dec 2023 |
| 400 | Numatex, Inc | | Oil Operator | Dec 2013 |