| 301 | M M Resources, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 302 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | May 2024 |
| 303 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2024 |
| 304 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Feb 2024 |
| 305 | Mack Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Nov 2000 |
| 306 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Mar 2024 |
| 307 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jan 2024 |
| 308 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Feb 2024 |
| 309 | McMillin C C & Company Inc | Guthrie, OK 73044-0546 | Oil & Gas Operator | Jan 2024 |
| 310 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Feb 2024 |
| 311 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 312 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 313 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 314 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 315 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | May 2024 |
| 316 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 317 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 318 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 319 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 320 | Mobil Exp & Prod Us Inc | Houston, TX 77060-1991 | Oil & Gas Operator | May 2001 |
| 321 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2024 |
| 322 | Moore Clay | Dallas, TX 75218-0217 | Oil & Gas Operator | Jan 2024 |
| 323 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 324 | Moran-K Oil LLC | Seminole, OK 74818-1295 | Oil & Gas Operator | Feb 2024 |
| 325 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | May 2024 |
| 326 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2024 |
| 327 | Muegge Don E | Lamont, OK 74643-5010 | Oil & Gas Operator | Dec 1996 |
| 328 | Muegge, Clay A. | Lamont, OK 74643 | Oil & Gas Operator | Feb 2024 |
| 329 | Muras Energy, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Jan 2024 |
| 330 | Musgrove Energy Inc | Ponca City, OK 74602 | Oil & Gas Operator | Dec 2023 |
| 331 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 332 | Navajo Exploration, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | May 2024 |
| 333 | Nelson Exploration Corporation | | Oil & Gas Operator | Jan 2024 |
| 334 | Nemaha Environmental Services LLC | Enid, OK 73703 | Oil Operator | Feb 2024 |
| 335 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | May 2024 |
| 336 | Nexus Resources Corporation | Drumright, OK 74030 | Oil & Gas Operator | Jan 2013 |
| 337 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | May 2024 |
| 338 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | May 2024 |
| 339 | Nordan Oil & Gas Corporation | Abilene, TX 79604 | Oil & Gas Operator | Feb 2018 |
| 340 | Nytex Energy LLC | Edmond, OK 73083-5946 | Oil & Gas Operator | Sep 2015 |
| 341 | O.G.P. Operating, Inc. | Dallas, TX 75231 | Oil & Gas Operator | May 2024 |
| 342 | Odum Ronald L | | Oil Operator | Jan 2024 |
| 343 | Oilrox Resources LLC | San Antonio, TX 78258 | Oil & Gas Operator | Aug 2023 |
| 344 | Okie Crude Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 345 | Oklahoma Liquid Resources Inc | Owasso, OK 74055-0841 | Oil & Gas Operator | Jan 2024 |
| 346 | Oklahoma Oil & Gas MGMT Inc | | Oil & Gas Operator | Jan 2024 |
| 347 | Oklahoma Petroleum Allies LLC | Ardmore, OK 73401 | Oil Operator | Oct 2023 |
| 348 | Okland Oil Company | Oklahoma City, OK 73102-9022 | Oil & Gas Operator | Feb 2024 |
| 349 | Omimex International Corporation | Fort Worth, TX 76103-2300 | Oil & Gas Operator | Jan 2024 |
| 350 | Omimex Petroleum Inc | Fort Worth, TX 76120 | Oil & Gas Operator | Aug 2022 |
| 351 | Oneok Exploration Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 352 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 353 | Oryx Crude Trading & Transporation LP | Dallas, TX 75221 | Oil & Gas Operator | Jun 1999 |
| 354 | Otc Petroleum Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2015 |
| 355 | Overflow Energy, LLC | Booker, TX 79005 | Oil & Gas Operator | May 2024 |
| 356 | Oxford Exploration Company | Denver, CO 80237 | Oil & Gas Operator | Aug 1995 |
| 357 | Palm Oil & Gas Company | Sedona, AZ 86340-4808 | Oil & Gas Operator | Feb 2024 |
| 358 | Panther Energy Company, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2022 |
| 359 | Paradigm Twenty LLC | | Oil & Gas Operator | Jan 2024 |
| 360 | Paramount Petroleum Corp | Dallas, TX 75374 | Oil Operator | Dec 2000 |
| 361 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 362 | Park Avenue Exploration Corp | Oklahoma City, OK 73102-5604 | Oil & Gas Operator | Sep 2011 |
| 363 | Parker & Parsley Dev Co | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 364 | Parkway Petroleum, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Jul 1997 |
| 365 | Parsons Engineering Corporation | Tulsa, OK 74137-7505 | Oil & Gas Operator | Oct 2017 |
| 366 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 367 | Patriot Petroleum Co LLC | Coppell, TX 75019-4216 | Oil & Gas Operator | Jan 2013 |
| 368 | PBT Enterprises Inc | Garber, OK 73738-0262 | Oil & Gas Operator | May 2023 |
| 369 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 370 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 371 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 372 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 373 | Petroleum Resources Co | Wichita, KS 67206 | Oil & Gas Operator | May 2000 |
| 374 | Petromark Resources Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1993 |
| 375 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | May 2024 |
| 376 | Phillips Oil Operating Co | Enid, OK 73703-4921 | Oil & Gas Operator | May 2019 |
| 377 | Placer Energy Corp | | Oil Operator | Jun 1997 |
| 378 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 379 | Plainsmen Energy LLC | | Oil & Gas Operator | Feb 2024 |
| 380 | Plymouth Exploration LLC | Tulsa, OK 74119-1031 | Oil & Gas Operator | Feb 2024 |
| 381 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 382 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 383 | Polaris Energy Dev Co | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2000 |
| 384 | Prentice Bro Oil Operators | Allen, OK 74825 | Oil & Gas Operator | Apr 2014 |
| 385 | Preston Oil Co | Woodlands, TX 77380 | Oil & Gas Operator | Dec 2009 |
| 386 | Priam Operating Company | Tulsa, OK 74152-0590 | Oil & Gas Operator | Jul 2022 |
| 387 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | May 2024 |
| 388 | Prime Energy Corp | Charleston, WV 25301-1707-1707 | Oil & Gas Operator | Sep 2015 |
| 389 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | May 2024 |
| 390 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Jan 2024 |
| 391 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Jan 2024 |
| 392 | Providence Oil & Gas Corp | Tulsa, OK 74135-5463 | Oil & Gas Operator | May 2005 |
| 393 | Pullers Oil Company LLC | Blackwell, OK 74631-0323 | Oil & Gas Operator | Feb 2024 |
| 394 | Qep Energy Company | Midland, TX 79701 | Oil & Gas Operator | Jan 2024 |
| 395 | Quail Creek Petro MGMT Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 396 | Quest Cherokee LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2024 |
| 397 | Questa Oil & Gas Co. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 398 | Questar Energy Trading | Salt Lake City, UT 84145-0601 | Oil & Gas Operator | Mar 2020 |
| 399 | Quick Draw Tank Trucks Inc | Lamont, OK 74643-0158 | Oil Operator | Oct 1997 |
| 400 | Quinn Energy Corp | MT Vernon, IN 47620 | Oil & Gas Operator | Oct 1999 |