| 301 | Inland Oil Corporation | Sapulpa, OK 74067 | Oil & Gas Operator | Nov 2025 |
| 302 | Inland Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 303 | Integrated Energy Service Corp | Cleveland, OK 74020 | Oil & Gas Operator | Nov 1998 |
| 304 | J & F Oil Co. | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 305 | J & J Production Company LLC | Okemah, OK 74859 | Oil & Gas Operator | Nov 2025 |
| 306 | J F K G & Associates | Sherman, TX 75091-0758 | Oil Operator | Oct 2008 |
| 307 | J I Staley Co LLC | Okmulgee, OK 74447 | Oil & Gas Operator | Aug 2025 |
| 308 | J K Exploration & Production Inc | Fullerton, CA 92832 | Oil & Gas Operator | Dec 2025 |
| 309 | J.R. Oil Company | Houston, TX 77007 | Oil & Gas Operator | Jul 2019 |
| 310 | Jacobs Jean | Hurdle Mills, NC 27541 | Oil & Gas Operator | May 2013 |
| 311 | Jagger Oil LLC | Konawa, OK 74849 | Oil & Gas Operator | Nov 2025 |
| 312 | James Energy Company | Okmulgee, OK 74447-0275 | Oil & Gas Operator | May 2013 |
| 313 | James Johnny | Sapulpa, OK 74066 | Oil & Gas Operator | Oct 2025 |
| 314 | James Oil Company | Compton, CA 90221-4399 | Oil & Gas Operator | Nov 2008 |
| 315 | James Raymond L | Sapulpa, OK 74066-8785 | Oil & Gas Operator | Nov 2025 |
| 316 | Jasper Oil LLC | Bristow, OK 74010-3907 | Oil & Gas Operator | Oct 2025 |
| 317 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 318 | JCN Petroleum Corporation | Edmond, OK 73083-3357 | Oil & Gas Operator | Jun 2004 |
| 319 | Jeau Mar Limited Inc | Tulsa, OK 74114 | Oil & Gas Operator | Jul 1996 |
| 320 | Jedaco Inc | | Gas Operator | May 2013 |
| 321 | Jericho Exploration | Weleetka, OK 74880-0704 | Oil & Gas Operator | Oct 2025 |
| 322 | Jewell Consulting Inc | Bixby, OK 74008 | Oil & Gas Operator | Dec 2022 |
| 323 | Jim Darnell Dba Jim Darnell Operating Co | Okmulgee, OK 74447-8988 | Oil & Gas Operator | Aug 2025 |
| 324 | Jobe Jr Frank | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 325 | Jobe SR Larry F | Morris, OK 74445 | Oil Operator | Oct 2025 |
| 326 | Judy Company Inc | Kansas City, KS 66111 | Oil & Gas Operator | May 2013 |
| 327 | Jwimco, L.L.C. | Dallas, TX 75229 | Oil & Gas Operator | Nov 2025 |
| 328 | K & M Oil Company LLC | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2025 |
| 329 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Nov 2025 |
| 330 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 331 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 332 | Kay Production Company | Seminole, OK 74868 | Oil & Gas Operator | Sep 2025 |
| 333 | Keck Petroleum LLC | Okmulgee, OK 74447-8516 | Oil & Gas Operator | Oct 2025 |
| 334 | Keener Oil & Gas Company | Tulsa, OK 74119-4416 | Oil & Gas Operator | Nov 2025 |
| 335 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 336 | Kelco Petroleum Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 2013 |
| 337 | Kelley Oil & Gas | McAlester, OK 74570 | Oil & Gas Operator | May 2013 |
| 338 | Kemmerer Company Inc | Tulsa, OK 74136-7027 | Oil & Gas Operator | Feb 2025 |
| 339 | Kenworthy Operating Company | Tulsa, OK 74132 | Oil & Gas Operator | May 2009 |
| 340 | Kiamichi Resources Inc | Oklahoma City, OK 73143 | Oil & Gas Operator | Feb 2016 |
| 341 | Kienzle John A | Shawnee, OK 74802-1265 | Oil & Gas Operator | Aug 2013 |
| 342 | Kimco Oil And Gas | Wewoka, OK 74884-0613 | Oil & Gas Operator | Jul 2016 |
| 343 | Kirk Billie E | Morris, OK 74445 | Oil & Gas Operator | Oct 2025 |
| 344 | Kirk Tank Trucks Inc | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 345 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 346 | Klingensmith Fred T Etal | Sapulpa, OK 74066 | Oil & Gas Operator | Nov 2007 |
| 347 | Klo LLC | Tulsa, OK 74120-2428 | Oil & Gas Operator | Nov 2025 |
| 348 | Klotzman, M. S. Exploration Co. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2025 |
| 349 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 350 | Kouplen Steve | Beggs, OK 74421 | Oil & Gas Operator | Oct 2024 |
| 351 | Kraker Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 1995 |
| 352 | Krumme Oil Company LLP | Bristow, OK 74010 | Oil & Gas Operator | Nov 2025 |
| 353 | L & R Oil Company | Oakley, KS 67748 | Oil & Gas Operator | Jan 2004 |
| 354 | Lakeland Pipeline Inc | Hominy, OK 74035-1006 | Oil & Gas Operator | Jun 2023 |
| 355 | Lamberton Oil Co Inc | Tulsa, OK 74107 | Oil & Gas Operator | May 2013 |
| 356 | Lamberton W J | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2015 |
| 357 | Lance Ruffel Oil & Gas LLC | Oklahoma City, OK 73102-5632 | Oil & Gas Operator | Nov 2025 |
| 358 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 359 | Laredo Petroleum Inc | Tulsa, OK 74120 | Oil & Gas Operator | Mar 2023 |
| 360 | Lariat Energy & Supply Co Inc | Hulbert, OK 74441 | Oil & Gas Operator | Jun 2025 |
| 361 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 362 | Laurel Operating Company | Stillwater, OK 74074-3025 | Oil & Gas Operator | Oct 2025 |
| 363 | Layco Oil | Okmulgee, OK 74447-2065 | Oil & Gas Operator | Apr 2020 |
| 364 | LBJ Production Inc | Okmulgee, OK 74447 | Oil Operator | Nov 1998 |
| 365 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 366 | Leatherneck Energy Group Inc | Addison, TX 75001-6025 | Oil & Gas Operator | Apr 2020 |
| 367 | Lee Jr W E | Beggs, OK 74421-2683 | Oil & Gas Operator | May 2013 |
| 368 | Leeman Energy Corporation | Oklahoma City, OK 73118-1802 | Oil & Gas Operator | Mar 2015 |
| 369 | Leg Up Operating Company LLC | Tulsa, OK 74135 | Oil Operator | Oct 2025 |
| 370 | Lerblance Jr W P Estate | Hartshorne, OK 74547-0449 | Oil & Gas Operator | Apr 2020 |
| 371 | Levinson Silvan E | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2012 |
| 372 | Lewis Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 1995 |
| 373 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 374 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Jun 2025 |
| 375 | Litsey Exploration LLC | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2025 |
| 376 | Little Chicago Oil & Gas Inc | Edmond, OK 73034-0809 | Oil & Gas Operator | Dec 2017 |
| 377 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Nov 2025 |
| 378 | Long Phillip C | Muskogee, OK 74403 | Oil & Gas Operator | May 2013 |
| 379 | Longhurst Oil & Gas Inc | | Oil & Gas Operator | Nov 2013 |
| 380 | Loving Company (The) | Broken Arrow, OK 74014-0001 | Oil & Gas Operator | May 2013 |
| 381 | Lunar Investments Inc | Oklahoma City, OK 73118-4823 | Oil & Gas Operator | Oct 2025 |
| 382 | Lundy Linda Susan | Council Hill, OK 74428 | Oil Operator | Oct 2025 |
| 383 | Lyric Energy, Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 1996 |
| 384 | Maintainer Energy Res Corp Inc | Morris, OK 74445-2663 | Oil Operator | Oct 2025 |
| 385 | Majestic Energy Company LLC | Keifer, OK 74041 | Oil Operator | Oct 2025 |
| 386 | Majestic Energy Corporation | Shreveport, LA 71164 | Oil & Gas Operator | May 2013 |
| 387 | Maly & Maly Oil | Beggs, OK 74421-2844 | Oil & Gas Operator | Oct 2025 |
| 388 | Manis Oil & Gas Inc | Blanchard, OK 73010 | Oil & Gas Operator | Sep 2025 |
| 389 | Manna Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Dec 2014 |
| 390 | Mantex Inc | Tulsa, OK 74114-6234 | Oil & Gas Operator | Mar 2015 |
| 391 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Nov 2025 |
| 392 | Marquise Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Nov 1992 |
| 393 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Sep 2025 |
| 394 | Martin Billy G | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 395 | Martin Burt K | Henryetta, OK 74437 | Oil & Gas Operator | Jul 2008 |
| 396 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 397 | Mathews & Casselman Oil Inc | Morris, OK 74445 | Oil & Gas Operator | Dec 2021 |
| 398 | Mathews Billy J | Morris, OK 74445-4826 | Oil & Gas Operator | Aug 2025 |
| 399 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 400 | May Energy Company | Stroud, OK 74079 | Oil & Gas Operator | May 2013 |