| 301 | Lamamco Drilling Company | Skiatook, OK 74070 | Oil & Gas Operator | Dec 2024 |
| 302 | Lariat Petroleum Inc | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2024 |
| 303 | Larkspur Operating LLC | Oklahoma City, OK 73034 | Oil & Gas Operator | Jan 2025 |
| 304 | Latigo Petroleum, LLC | Pampa, TX 79066 | Oil & Gas Operator | Mar 2025 |
| 305 | LCB Resources LLC | Kingfisher, OK 73750-2322 | Oil & Gas Operator | Jan 2025 |
| 306 | Lear Petroleum Corp | Houston, TX 77210 | Oil & Gas Operator | Mar 2015 |
| 307 | Lear Petroleum Exploration Inc | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 308 | Leede Oil & Gas Inc. | Greenwood VLG, CO 80111 | Oil & Gas Operator | Aug 2003 |
| 309 | Lime Rock Resources A, L.P. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 310 | Lindenmuth & Associates Inc | Austin, TX 78703 | Oil & Gas Operator | Aug 2024 |
| 311 | Lobar Oil Co LLC | Oklahoma City, OK 73116-1516 | Oil & Gas Operator | Dec 2024 |
| 312 | Locators Oil And Gas Inc | Guthrie, OK 73044 | Oil & Gas Operator | Oct 2022 |
| 313 | Lodestone Operating, Inc. | Portland, TX 78374 | Oil & Gas Operator | Mar 2025 |
| 314 | Longview Production Company | Dallas, TX 75243-3795 | Oil & Gas Operator | Dec 2024 |
| 315 | Lorentz Oil & Gas LLC | Edmond, OK 73034-7266 | Oil & Gas Operator | Dec 2024 |
| 316 | Louis Dreyfus Gas Marketing | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2018 |
| 317 | Louisiana Land & Exploration Co. | Houston, TX 77210 | Oil & Gas Operator | Sep 2013 |
| 318 | LX4 LLC | Gage, OK 73843 | Oil Operator | Nov 2024 |
| 319 | M B Oilfield Services | Oklahoma City, OK 73136 | Oil & Gas Operator | Jun 2003 |
| 320 | M E Klein & Associates LLC | Washington, OK 73093-4663 | Oil & Gas Operator | Jan 2025 |
| 321 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Dec 2024 |
| 322 | M V Purchasing LLC | Wichita, KS 67202 | Oil & Gas Operator | Dec 2024 |
| 323 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Jan 2025 |
| 324 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 325 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2025 |
| 326 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 327 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 328 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2024 |
| 329 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Nov 2024 |
| 330 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 331 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 332 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Dec 2024 |
| 333 | Maxey Homer G | | Oil & Gas Operator | Nov 1997 |
| 334 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 335 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jan 2025 |
| 336 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jan 2025 |
| 337 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Dec 2024 |
| 338 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 339 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 340 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2024 |
| 341 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 342 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 343 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 344 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 345 | Mija LLC | Edmond, OK 73034 | Oil & Gas Operator | Jan 2025 |
| 346 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 347 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 348 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Dec 2024 |
| 349 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 350 | Morrison Oil Company | Bartlesville, OK 74003 | Oil Operator | Mar 2015 |
| 351 | Mountain Front Pipeline Co Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 352 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Mar 2025 |
| 353 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 354 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 355 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 356 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 357 | Nadel And Gussman, L.L.C. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2025 |
| 358 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 359 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 360 | Natural Gas Pipeline Co Of Am LLC | Downers Grove, IL 60515-3708 | Oil & Gas Operator | Mar 2015 |
| 361 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Mar 2025 |
| 362 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2024 |
| 363 | Neok Production Company LLC | Nowata, OK 74048 | Oil & Gas Operator | Dec 2024 |
| 364 | Nexsreem Corporation | Tyler, TX 75703 | Oil & Gas Operator | Dec 2020 |
| 365 | Nextera Energy Power Marketing LLC | Juno Beach, FL 33408 | Oil & Gas Operator | Dec 2024 |
| 366 | Nject Disposal LLC | Houston, TX 77027 | Oil Operator | Mar 2017 |
| 367 | NM&O Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2024 |
| 368 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Mar 2025 |
| 369 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Mar 2025 |
| 370 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Mar 2025 |
| 371 | Nortex Gas & Oil Co | Tulsa, OK 74135 | Oil & Gas Operator | Sep 1993 |
| 372 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Mar 2025 |
| 373 | Notting Hill Energy LLC | Fort Worth, TX 76101 | Oil & Gas Operator | Mar 2025 |
| 374 | Nova Energy Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 375 | Nye Oil Company | Oklahoma City, OK 73118-1245 | Oil & Gas Operator | Jun 2004 |
| 376 | O G & E | Oklahoma City, OK 73124 | Oil & Gas Operator | Feb 2014 |
| 377 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2024 |
| 378 | Oklahoma & Northwestern Co. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1997 |
| 379 | Oklahoma Equipment & Salvage | Oklahoma City, OK 73120-5903 | Oil & Gas Operator | Mar 2015 |
| 380 | Oklahoma Oil & Gas MGMT Inc | Edmond, OK 73083-6786 | Oil & Gas Operator | Dec 2024 |
| 381 | Okland Oil Company | Oklahoma City, OK 73102-9022 | Oil & Gas Operator | Jan 2025 |
| 382 | Old Dominion Oil Corporation | Oklahoma City, OK 73107 | Oil & Gas Operator | Apr 2009 |
| 383 | Oneok Exploration Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 384 | Oneok Field Services Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2022 |
| 385 | Oneok Gas Transportation Co | Tulsa, OK 74121-2089 | Oil & Gas Operator | Oct 2014 |
| 386 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 387 | Opal Operating Company LLC | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 388 | Overflow Energy, LLC | Booker, TX 79005 | Oil & Gas Operator | Mar 2025 |
| 389 | Ovintiv Mid-Continent Inc. | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jan 2025 |
| 390 | Ovintiv USA Inc. | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 391 | Oxley Petroleum | Tulsa, OK 74119-3609 | Oil & Gas Operator | Jan 2020 |
| 392 | Oxley Petroleum Co | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Sep 2017 |
| 393 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 394 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 395 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 396 | Paloma Operating Co Inc | Houston, TX 77002-5220 | Oil & Gas Operator | Dec 2024 |
| 397 | Panda Resources Inc | Tulsa, OK 74137-3536 | Oil & Gas Operator | Feb 1994 |
| 398 | Panhandle Trading Company | Houston, TX 77251-1642 | Oil & Gas Operator | Jun 2003 |
| 399 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 400 | Park Avenue Exploration Corp | Oklahoma City, OK 73102-5604 | Oil & Gas Operator | Sep 2011 |