| 301 | J&R Operating | Holliday, TX 76366 | Oil & Gas Operator | Feb 2024 |
| 302 | J.R. Oil Company | Houston, TX 77007 | Oil & Gas Operator | Jul 2019 |
| 303 | Jagger Oil LLC | Konawa, OK 74849 | Oil & Gas Operator | Jan 2026 |
| 304 | James Petroleum Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Feb 2014 |
| 305 | January Investments LLC | Norman, OK 73069-8224 | Oil & Gas Operator | Feb 2026 |
| 306 | Jay Petroleum Inc | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Mar 2019 |
| 307 | JCTJ Energy LLC | Asher, OK 74826 | Oil & Gas Operator | Feb 2026 |
| 308 | Jerico Resources LLC | Seminole, OK 74868-6538 | Oil & Gas Operator | Apr 2020 |
| 309 | Jerry Scott Drilling Company Inc | Ada, OK 74821 | Oil & Gas Operator | Apr 2025 |
| 310 | Jet Oil Co12/Ofb See 18649 | | Oil & Gas Operator | Jul 2007 |
| 311 | Jetson Operating Inc | Ada, OK 74820 | Oil & Gas Operator | Sep 2024 |
| 312 | Jimmy R Chatham LLC | Healdton, OK 73438 | Oil & Gas Operator | Feb 2026 |
| 313 | JLR Investments Inc | Oklahoma City, OK 73151-9101 | Oil & Gas Operator | Sep 2014 |
| 314 | Jma Resources Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Feb 2026 |
| 315 | JMG Vacuum Trucks Inc | | Oil Operator | Feb 2026 |
| 316 | Johnson June | Lawton, OK 73501-9624 | Oil & Gas Operator | Mar 2025 |
| 317 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2026 |
| 318 | Jones Jr Lee R | Sedan, KS 67361 | Oil & Gas Operator | Jun 2008 |
| 319 | Jordan & Jordan Oil Company | Maud, OK 74854 | Oil & Gas Operator | Feb 2026 |
| 320 | Josie Oil & Gas Inc | Seminole, OK 74818-0134 | Oil & Gas Operator | Mar 2015 |
| 321 | Jvo Petroleum Inc | Shawnee, OK 74801 | Oil & Gas Operator | Jul 1995 |
| 322 | K Oil Company | Houston, TX 77005 | Oil & Gas Operator | Apr 2026 |
| 323 | K S Oil Company Inc | Norman, OK 73072-7480 | Oil & Gas Operator | Jan 2026 |
| 324 | K-Von Enterprises Inc | Tecumseh, OK 74873 | Oil & Gas Operator | Jan 1994 |
| 325 | Kahan & Associates Inc | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2026 |
| 326 | Kahan Louis | Tulsa, OK 74101 | Oil & Gas Operator | May 1994 |
| 327 | Kahn George Operating Co | Seminole, OK 74818 | Oil & Gas Operator | Nov 2000 |
| 328 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2026 |
| 329 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Jan 2026 |
| 330 | Kelloil Inc | Fort Worth, TX 76116-5600 | Oil & Gas Operator | Mar 2015 |
| 331 | Kelly Cook Oil LLC | Shawnee, OK 74804-3148 | Oil & Gas Operator | Feb 2026 |
| 332 | Kepasa Corp | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2025 |
| 333 | Kerr-McGee Refining Corp | Oklahoma City, OK 73125 | Oil & Gas Operator | Jun 2007 |
| 334 | Kim Ray Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Dec 2025 |
| 335 | Kingery Drilling Co., Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2026 |
| 336 | Kirkpatrick Oil Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2026 |
| 337 | Kloberdanz Paul E | Oklahoma City, OK 73157 | Oil & Gas Operator | Aug 2021 |
| 338 | Koby Oil Company LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 339 | Koch Oil Company | | Oil & Gas Operator | May 2017 |
| 340 | Krumme Wesley J | Oklahoma City, OK 73120 | Oil & Gas Operator | Jun 1997 |
| 341 | KWB Oil Property Management Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 342 | L & B Oil Company Inc | Dallas, TX 75225 | Oil & Gas Operator | Mar 2025 |
| 343 | Lackey WM Oil & Gas Oper Co | Shawnee, OK 74801 | Oil & Gas Operator | Jan 1994 |
| 344 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 345 | Ladder Energy Company | Tulsa, OK 74120-4281 | Oil & Gas Operator | Jan 2018 |
| 346 | Laird Anita Louise | Asher, OK 74826-3215 | Oil Operator | Jun 2018 |
| 347 | Laird Bill Oil Company | St Louis, OK 74866 | Oil & Gas Operator | Feb 2026 |
| 348 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Jan 2026 |
| 349 | Landmark Energy LLC | Seminole, OK 74868 | Oil & Gas Operator | Jan 2026 |
| 350 | Lapetco Inc | Plano, TX 75093 | Oil & Gas Operator | Aug 2024 |
| 351 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Apr 2026 |
| 352 | Larron Energy Corporation | New Braunfels, TX 78132 | Oil & Gas Operator | Mar 2015 |
| 353 | Lasmo Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2024 |
| 354 | Leasehold Management Corp | Oklahoma City, OK 73107 | Oil & Gas Operator | Nov 2024 |
| 355 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 356 | Lee Energy LLC | Edmond, OK 73034-7668 | Oil Operator | Jan 2005 |
| 357 | Leigh Operating Co | Dallas, TX 75205 | Oil & Gas Operator | Mar 2008 |
| 358 | Lema Petroleum Inc | Seminole, OK 74868 | Oil & Gas Operator | Jan 2026 |
| 359 | Lewis A. Hembree Production Company | Shawnee, OK 74801 | Oil & Gas Operator | Jan 2026 |
| 360 | Liberty Operating Inc | Norman, OK 73069-8225 | Oil & Gas Operator | Dec 2024 |
| 361 | Lillard Pipe & Supply Inc | Shawnee, OK 74802-0847 | Oil & Gas Operator | Nov 2014 |
| 362 | Lion Petroleum Company | Oklahoma City, OK 73120-4503 | Oil & Gas Operator | Aug 2015 |
| 363 | Little River Energy Company | Drumright, OK 74030 | Oil & Gas Operator | Feb 2026 |
| 364 | Lobar Oil Co LLC | Edmond, OK 73013 | Oil & Gas Operator | Jan 2026 |
| 365 | Lre Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2016 |
| 366 | Lu-Ray Petroleum LLC | Oklahoma City, OK 73121-1607 | Oil & Gas Operator | Feb 2026 |
| 367 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Feb 2026 |
| 368 | Magaw & Zimmer | Perry, OK 73077-1055 | Oil & Gas Operator | Aug 2013 |
| 369 | Magic Investments LLC | Edmond, OK 73013 | Oil & Gas Operator | Nov 2025 |
| 370 | Magma Resources LLC | Paoli, OK 73074 | Oil & Gas Operator | Apr 2025 |
| 371 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Feb 2026 |
| 372 | Majors Gary E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Dec 2025 |
| 373 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 374 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Feb 2026 |
| 375 | Marjo Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Oct 1999 |
| 376 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Jan 2026 |
| 377 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 378 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Dec 2025 |
| 379 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Feb 2026 |
| 380 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Feb 2026 |
| 381 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2026 |
| 382 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 383 | Marsh Oil & Gas Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Feb 2026 |
| 384 | Martin Jr, James U | | Oil & Gas Operator | Feb 2026 |
| 385 | Martin Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Feb 2026 |
| 386 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 387 | Matna Enterprises LLC | Maud, OK 74854-2812 | Oil & Gas Operator | Nov 2025 |
| 388 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Feb 2026 |
| 389 | McClintock, Robert T | | Oil & Gas Operator | Jan 2026 |
| 390 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 391 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 392 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Feb 2026 |
| 393 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Aug 2025 |
| 394 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 395 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2026 |
| 396 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Feb 2026 |
| 397 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 398 | Midwest Pipe & Supply Company | Oklahoma City, OK 73154-0245 | Oil & Gas Operator | Dec 2008 |
| 399 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 400 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |