| 18401 | Matzinger Petroleum Co. | | Oil & Gas Operator | Jan 1991 |
| 18402 | Maurine B. Pyle | | Oil & Gas Operator | Mar 1993 |
| 18403 | Mauro J. Dentino | | Oil Operator | Mar 2025 |
| 18404 | Mauslein, Lenore | Wellsville, KS 66092 | Oil Operator | Oct 2001 |
| 18405 | Maverick Brothers Operating,Inc. | Enid, OK 73702 | Oil & Gas Operator | Jun 2025 |
| 18406 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Mar 2025 |
| 18407 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 18408 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Jun 2025 |
| 18409 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 18410 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 18411 | Maverick Exploration And Production Inc | | Oil & Gas Operator | Mar 2025 |
| 18412 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil Operator | Jun 2025 |
| 18413 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Jun 2025 |
| 18414 | Maverick Oil Corp. | | Oil Operator | May 1997 |
| 18415 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 18416 | Maverick Permian LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 18417 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 18418 | Maverick Producers, Inc. | | Oil Operator | May 2012 |
| 18419 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 18420 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 18421 | Max Oil Company | Blackwell, OK 74631 | Oil & Gas Operator | Apr 2024 |
| 18422 | Max Oil LLC | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 18423 | Max Papay LLC | Meade, KS 67864 | Oil & Gas Operator | Jun 2018 |
| 18424 | Maxam Incorporat | | Oil Operator | Jun 1991 |
| 18425 | Maxcrude, LLC | Winfield, KS 67156 | Oil & Gas Operator | Feb 2025 |
| 18426 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 18427 | Maxie D, Inc. | Laguna Niguel, CA 92677 | Gas Operator | Feb 1998 |
| 18428 | Maxim Drilling & Expl Inc | Gillette, WY 82717 | Oil & Gas Operator | Apr 2025 |
| 18429 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Mar 2025 |
| 18430 | Maxim Energy Inc Dba Maxim Tep Inc | | Oil Operator | Dec 2009 |
| 18431 | Maxim Resources LTD U.S.A. | | Oil & Gas Operator | Dec 1997 |
| 18432 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 18433 | Maximum Energy Development, LLC | Glasgow, KY 42142 | Oil Operator | Dec 2022 |
| 18434 | Maximum Lease Service, Inc | Eunice, NM 88231 | Oil & Gas Operator | Apr 2025 |
| 18435 | Maximum Oil & Gas, Inc | | Gas Operator | Dec 2023 |
| 18436 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Jun 2025 |
| 18437 | Maxine Oil Company | Muskogee, OK 74401-0512 | Oil & Gas Operator | Sep 2014 |
| 18438 | Maxland Oil Company | Haslet, TX 76052-5137 | Oil Operator | Nov 2014 |
| 18439 | Maxoil Inc. | | Oil & Gas Operator | Dec 2004 |
| 18440 | Maxson Gas Corp | Shinglehouse, PA 16748-0436 | Oil & Gas Operator | Dec 2024 |
| 18441 | Maxson Lawrence C | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2016 |
| 18442 | Maxum Energy Corp | Plano, TX 75025 | Oil & Gas Operator | Jan 2003 |
| 18443 | Maxus Exploratio | | Oil Operator | Jun 1991 |
| 18444 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 18445 | Maxwell Bros | Clarion, PA 16214-7446 | Oil & Gas Operator | Dec 2024 |
| 18446 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 18447 | Maxwell Operating Co., Inc. | Englewood, CO 80155 | Oil Operator | Jan 2007 |
| 18448 | Maxwell Resources Corporation | Oklahoma City, OK 73116-7746 | Oil & Gas Operator | Apr 2009 |
| 18449 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 18450 | Maxwell, Richard | Wichita Falls, TX 76301 | Oil & Gas Operator | May 1995 |
| 18451 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 18452 | May Energy Company | Stroud, OK 74079 | Oil & Gas Operator | May 2013 |
| 18453 | May Gas, Inc. | | Oil & Gas Operator | Dec 2008 |
| 18454 | May Investments, Inc. | New Boston, TX 75570 | Oil & Gas Operator | Aug 2003 |
| 18455 | May Oil & Gas, L.L.C. | | Oil & Gas Operator | Dec 2013 |
| 18456 | May Petroleum, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 18457 | Maya Oil LLC | | Oil Operator | Apr 2025 |
| 18458 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Mar 2025 |
| 18459 | Maybrier Brothers | | Oil Operator | Apr 2006 |
| 18460 | Maybrier Production, L.L.C. | | Oil Operator | Oct 2022 |
| 18461 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Jun 2025 |
| 18462 | Mayes Donald W & Associates | Piedmont, OK 73078-0051 | Oil & Gas Operator | Dec 1996 |
| 18463 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 18464 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Jun 2025 |
| 18465 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Jun 2025 |
| 18466 | Mayfield SWD LLC | McKinney, TX 75070-5020 | Oil Operator | Aug 2021 |
| 18467 | Mayhar N D | Eufaula, OK 74432 | Oil Operator | Apr 2015 |
| 18468 | Mayhew Properties | | Gas Operator | Feb 2025 |
| 18469 | Mayjac I, LLC | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 18470 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 18471 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 18472 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 18473 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 18474 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Jun 2025 |
| 18475 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Jun 2025 |
| 18476 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 18477 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 18478 | Mays Coal Co | Clarion, PA 16214-0447 | Gas Operator | Dec 2003 |
| 18479 | Mays Gas & Coal Co | Clarion, PA 16214-0447 | Oil & Gas Operator | Dec 2024 |
| 18480 | Mays Oil LLC | | Oil Operator | Apr 2021 |
| 18481 | Mays, Sam W., Jr. Estate | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2005 |
| 18482 | Mayshark, James Page | Sherman, NY 14781 | Gas Operator | Dec 2023 |
| 18483 | Mazco Energy LLC | San Antonio, TX 78266 | Oil & Gas Operator | Jun 2025 |
| 18484 | Mazurkiewicz, Gary, Kimberly, Matt | Perrysburg, NY 14129 | Gas Operator | Dec 2023 |
| 18485 | MB Energy, LLC | San Antonio, TX 78233 | Oil & Gas Operator | Jun 2025 |
| 18486 | MB Exploration, LLC | Dallas, TX 75380 | Oil & Gas Operator | Jul 2008 |
| 18487 | MB Holdings LLC | Independence, KS 67301 | Oil Operator | Feb 2025 |
| 18488 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 18489 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 18490 | Mbi Oil & Gas LLC | Dickinson, ND 58601 | Oil & Gas Operator | Apr 2025 |
| 18491 | MBM Partnership | | Gas Operator | Nov 1991 |
| 18492 | MBM Production, LLC | Pikeville, KY 41501 | Oil & Gas Operator | Dec 2023 |
| 18493 | Mbo, LLC | | Oil Operator | Jan 2025 |
| 18494 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 18495 | MBS Resources Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2024 |
| 18496 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Jun 2025 |
| 18497 | MC C Oil Co Inc | Sedan, KS 67361 | Oil Operator | Apr 2016 |
| 18498 | MC Glover, LLC | Albany, TX 76430 | Oil Operator | Jun 2025 |
| 18499 | MC Oil, LLC | Morganfield, KY 42437 | Oil Operator | Dec 2023 |
| 18500 | MC Panhandle, Inc. | Tulsa, OK 74102 | Gas Operator | Jul 1998 |