| 18301 | McMullin Well Se | | Oil & Gas Operator | Sep 1995 |
| 18302 | McMullin, Douglas | Wellsville, KS 66092 | Oil Operator | Nov 2025 |
| 18303 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Jun 2026 |
| 18304 | McMurry Energy Company | | Oil & Gas Operator | Dec 2001 |
| 18305 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 18306 | McMurtrie Oil Inc | | Oil & Gas Operator | Mar 2026 |
| 18307 | McNallen & Griffin | Keller, TX 76244 | Oil & Gas Operator | Jun 2026 |
| 18308 | McNallen Oil Co., Inc. | Keller, TX 76244 | Oil & Gas Operator | Jun 2026 |
| 18309 | McNeal Production Inc | Perry, OK 73077-0268 | Oil & Gas Operator | Nov 2014 |
| 18310 | McNeish Oil Oper | | Oil & Gas Operator | Feb 1991 |
| 18311 | McNeish Oil Operations | | Oil Operator | Nov 2019 |
| 18312 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 18313 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 18314 | McNown, Carl H. | Moline, KS 67353 | Oil Operator | Jun 2021 |
| 18315 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 18316 | McO Resources Corporation | | Oil & Gas Operator | Feb 1986 |
| 18317 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 18318 | McOil Montana One LLC | Vancouver, BC V6Z2W5 | Gas Operator | Aug 2025 |
| 18319 | McOil Operating Company LLC | Muskogee, OK 74401 | Oil & Gas Operator | Feb 2026 |
| 18320 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 18321 | McOr Oil Development, Inc. | | Oil & Gas Operator | Feb 1990 |
| 18322 | McOsker Bros., Inc. | San Antonio, TX 78264 | Oil & Gas Operator | Aug 2003 |
| 18323 | McPhaul, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Jun 2026 |
| 18324 | McPhearson, Richard E. | | Oil Operator | Mar 1956 |
| 18325 | McPherson Drilling | | Oil Operator | Jun 2015 |
| 18326 | McPherson Drilling Co. | | Oil Operator | Jan 1998 |
| 18327 | McQuadrangle, LC | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2006 |
| 18328 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 18329 | McQueen Kevin L | Newark, OH 43055 | Oil Operator | Dec 2024 |
| 18330 | McQueeney, John J. | Osawatomie, KS 66064 | Oil Operator | Jan 1985 |
| 18331 | MCR Operating Group | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2026 |
| 18332 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Jan 2026 |
| 18333 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 18334 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 18335 | McRae Exploration, Inc. | | Oil & Gas Operator | Mar 1984 |
| 18336 | McRae Exploration, Inc. & Epm | | Oil & Gas Operator | Mar 1978 |
| 18337 | McRae Exploration, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 18338 | McRae Exploration,Inc & Bec | | Oil & Gas Operator | Feb 1984 |
| 18339 | McRae Oil Corporation | | Oil & Gas Operator | Mar 1984 |
| 18340 | McRae, Nathan Rathburn | Hebbronville, TX 78361 | Oil & Gas Operator | Apr 1994 |
| 18341 | McRae, William R. | Scottsdale, AZ 85254 | Oil Operator | Aug 1995 |
| 18342 | McRain Petroleum | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2020 |
| 18343 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 18344 | McWhinney Holding Company LLLP | | Oil & Gas Operator | Mar 2021 |
| 18345 | MCZ Oil Co, Inc. | | Oil Operator | Feb 1994 |
| 18346 | MCZ, Inc. | Houston, TX 77026 | Oil & Gas Operator | Sep 1990 |
| 18347 | MD America Energy, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 18348 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 18349 | MDC Texas Operator LLC | Midland, TX 79705 | Oil & Gas Operator | Jun 2026 |
| 18350 | MDF Oil Company | Floresville, TX 78114 | Oil Operator | Jun 2026 |
| 18351 | MDM Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | Jun 2026 |
| 18352 | Mdopps, LLC | Wichita, KS 67203 | Oil Operator | Apr 2023 |
| 18353 | MDS Energy Dev LLC | Kittanning, PA 16201-4403 | Oil & Gas Operator | Mar 2026 |
| 18354 | MDS Energy Development LLC | | Oil & Gas Operator | Mar 2026 |
| 18355 | MDS Energy LTD | Kittanning, PA 16201-4403 | Gas Operator | Feb 2015 |
| 18356 | Me-Tex Oil & Gas, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Jun 2026 |
| 18357 | Me-Tex Supply Company | Hobbs, NM 88240 | Oil & Gas Operator | Jun 1993 |
| 18358 | Mead Oil LLC | Sheffield, PA 16347-1022 | Oil & Gas Operator | Dec 2025 |
| 18359 | Mead, Nathaniel E | Irving, NY 14081 | Gas Operator | Dec 2024 |
| 18360 | Meadco Properties | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 18361 | Meadco Properties LTD | Midland, TX 79702 | Oil & Gas Operator | Sep 2019 |
| 18362 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Feb 2026 |
| 18363 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 18364 | Meador Enterprises, Inc. | Kilgore, TX 75662 | Oil Operator | Oct 2023 |
| 18365 | Meador Hubbell Meador Inc | Beggs, OK 74421-0794 | Oil & Gas Operator | Apr 2020 |
| 18366 | Meador Oil Company Inc | Lubbock, TX 79415 | Oil & Gas Operator | Oct 2022 |
| 18367 | Meador, John E. | Eldorado, TX 76936 | Oil & Gas Operator | Apr 2014 |
| 18368 | Meador, T. C. | San Angelo, TX 76902 | Oil & Gas Operator | Jun 2026 |
| 18369 | Meadors Jr J W Trust | Bixby, OK 74008-0151 | Oil & Gas Operator | Aug 2013 |
| 18370 | Meadors Operating Co | Jennings, OK 74038-0233 | Oil Operator | Mar 2026 |
| 18371 | Meadow Deep LLC | | Oil & Gas Operator | Apr 2026 |
| 18372 | Meadow Ridge Development, LLC | Washington, PA 15301 | Oil & Gas Operator | Dec 2021 |
| 18373 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Feb 2026 |
| 18374 | Meadowlark Operating Co | | Oil & Gas Operator | Mar 2026 |
| 18375 | Meadows Jr, S. L. Production Inc. | Ravenswood, WV 26164-0022 | Oil & Gas Operator | Dec 2021 |
| 18376 | Meadows Oil Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2004 |
| 18377 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |
| 18378 | Means Oil Company, LLC | Corsicana, TX 75110 | Oil & Gas Operator | Jun 2026 |
| 18379 | Means, Frank L. | Corsicana, TX 75110 | Oil & Gas Operator | Jan 2001 |
| 18380 | Mears, John C. | Chanute, KS 66720 | Oil Operator | Dec 2017 |
| 18381 | Meason Oper. Co. For Cinco Energy Corp. | | Oil & Gas Operator | Sep 2000 |
| 18382 | Meason Operating Company | Natchez, MS 39121 | Oil & Gas Operator | Dec 2011 |
| 18383 | Meb, LLC | Austin, TX 78737 | Oil Operator | Jun 2026 |
| 18384 | Mec-Goodrich Oil Co. | | Oil & Gas Operator | Feb 1985 |
| 18385 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 18386 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 18387 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 18388 | Medallion Calif Properties Co. | | Oil & Gas Operator | Dec 2003 |
| 18389 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 18390 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 18391 | Medallion Exploration Corp. | Midvale, UT 84047 | Oil & Gas Operator | Oct 1998 |
| 18392 | Medallion Oil Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2012 |
| 18393 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 18394 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 18395 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2026 |
| 18396 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 18397 | Medina Res Dev Co LLC | Cambridge Springs, PA 16403-3447 | Oil & Gas Operator | Mar 2026 |
| 18398 | Medlen, Dean S. | Rantoul, KS 66079 | Oil Operator | Aug 1993 |
| 18399 | Medora Minerals, LLC | | Oil & Gas Operator | Apr 2026 |
| 18400 | Meeder, Curt N. | Ripley, NY 14775 | Gas Operator | Dec 2024 |