| 18301 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 18302 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Apr 2025 |
| 18303 | Manti Tarka Permian Op, LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2025 |
| 18304 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Apr 2025 |
| 18305 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2025 |
| 18306 | Manufacturers Light & Heat Co | Pittsburgh, PA 15219 | Gas Operator | Dec 1986 |
| 18307 | Manursing Island Prod. Corp. | | Oil & Gas Operator | Sep 2002 |
| 18308 | Manx Inc | Pleasantville, PA 16341-1229 | Oil Operator | Dec 2020 |
| 18309 | Manx Oil Corporation | Casper, WY 82601 | Oil & Gas Operator | Jun 2010 |
| 18310 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 18311 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 18312 | Manzano LLC | Roswell, NM 88202 | Oil & Gas Operator | Apr 2025 |
| 18313 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 18314 | Manziel Interests | Tyler, TX 75711 | Oil & Gas Operator | Jun 2004 |
| 18315 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 18316 | Map Associates, L.P. | | Oil & Gas Operator | Mar 1995 |
| 18317 | Map Drilling Company | | Oil & Gas Operator | Apr 2012 |
| 18318 | Map Oil Co. | | Oil Operator | Jan 1978 |
| 18319 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 18320 | Mapco Inc | Billings, MT 59102 | Oil & Gas Operator | Dec 1983 |
| 18321 | Mapco Oil & Gas Company | Tulsa, OK 74101-2115 | Oil & Gas Operator | Jan 1985 |
| 18322 | Mapco Oil Company | | Oil & Gas Operator | Jan 1985 |
| 18323 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 18324 | Maple Energy Holdings, LLC | Houston, TX 77007 | Oil & Gas Operator | Sep 2023 |
| 18325 | Maple Grove Enterprises Inc | Rimersburg, PA 16248-6415 | Oil & Gas Operator | Dec 2024 |
| 18326 | Maple Gulf Coast Props. Corp. | | Oil & Gas Operator | Jun 1989 |
| 18327 | Maple Lane Farms Dairy And Grain LLC | Marietta, NY 13110 | Gas Operator | Dec 2023 |
| 18328 | Maple Leaf Energ | | Oil & Gas Operator | Sep 1989 |
| 18329 | Maple Properties Corp | Dallas, TX 75204 | Oil & Gas Operator | Jan 1999 |
| 18330 | Mapleton Gas Pipeline, Inc. | Mapleton, KS 66754 | Gas Operator | Jun 2011 |
| 18331 | Mar Oil & Gas Corp. | Santa Fe, NM 87502 | Oil & Gas Operator | Feb 2025 |
| 18332 | Mar Oil Company | Upper Sandusky, OH 43351 | Oil & Gas Operator | Dec 2023 |
| 18333 | Mar-Bar Enterprises Inc | Cushing, OK 74023-3031 | Oil Operator | Jan 2025 |
| 18334 | Mar-Bec Energy Company, L.L.C. | Shreveport, LA 71105 | Oil & Gas Operator | May 2001 |
| 18335 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Dec 2024 |
| 18336 | Mar-Low Corporation | | Oil & Gas Operator | Mar 1992 |
| 18337 | Mar-Win Development Co. | | Oil & Gas Operator | Nov 1988 |
| 18338 | Mar/Reg Investments | Irving, TX 75016 | Oil & Gas Operator | Jul 1999 |
| 18339 | Mar/Reg Oil Company | Reno, NV 89511 | Oil & Gas Operator | Jan 2025 |
| 18340 | Maralex Resources Inc | Ignacio, CO 81137 | Oil & Gas Operator | Feb 2025 |
| 18341 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 18342 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 18343 | Maram Energy Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2023 |
| 18344 | Maran Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Dec 2020 |
| 18345 | Maran Oil Company, LLC | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2022 |
| 18346 | Maranatha Energy Corporation | Princeton, WV 24740-0000 | Oil & Gas Operator | Dec 2021 |
| 18347 | Maranatha Exploration Inc | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1992 |
| 18348 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 18349 | Maranatha Oil Company | Gonzales, TX 78629 | Oil & Gas Operator | Apr 2025 |
| 18350 | Maranatha Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 18351 | Marata Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 18352 | Marathon Corporation | | Oil Operator | Dec 1994 |
| 18353 | Marathon Oil Co.-Rocky Mountain Region | Cody, WY 82414 | Oil Operator | Dec 1999 |
| 18354 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 18355 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 18356 | Marathon Oil Company Operator | | Oil & Gas Operator | Dec 1993 |
| 18357 | Marathon Oil Company/Fina | | Oil & Gas Operator | Jan 2005 |
| 18358 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 18359 | Marathon Oil Permian LLC | Houston, TX 77024 | Oil & Gas Operator | Feb 2025 |
| 18360 | Marben Corporation | | Oil Operator | Jul 1995 |
| 18361 | Marbet LLC | Edmond, OK 73013-6691 | Oil & Gas Operator | Jan 2025 |
| 18362 | Marbil Oil, Inc. | Olney, TX 76374 | Oil & Gas Operator | Jun 2013 |
| 18363 | Marbob Energy Corp | Artesia, NM 882110227 | Oil & Gas Operator | Oct 2010 |
| 18364 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 18365 | Marco Drilling Inc | Monroeville, PA 15146-0278 | Oil & Gas Operator | Dec 2023 |
| 18366 | Marco Land & Petroleum, Inc. | | Oil & Gas Operator | Jun 2000 |
| 18367 | Marco Oil Co, Inc | Sparta, KY 41086 | Oil Operator | Dec 2021 |
| 18368 | Marco Oil Compan | | Oil & Gas Operator | Aug 1992 |
| 18369 | Marco Oil Company LLC | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2025 |
| 18370 | Marco Polo Exploration, Inc. | Rosenberg, TX 77471 | Oil & Gas Operator | Dec 1993 |
| 18371 | Marcon Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2011 |
| 18372 | Marconi Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Aug 1997 |
| 18373 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 18374 | Marcus Exploration Inc | Piedmont, OK 73078-0308 | Oil & Gas Operator | Dec 2000 |
| 18375 | Mardale Drilling Company | Oklahoma City, OK 73157 | Oil Operator | Nov 1998 |
| 18376 | Marden Petroleum Exp Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1990 |
| 18377 | Marden Producing | | Gas Operator | Aug 1990 |
| 18378 | Marden Producing Company | Edmond, OK 73083 | Gas Operator | Dec 2024 |
| 18379 | Mare Energy | Danville, OH 43014 | Oil & Gas Operator | Dec 2021 |
| 18380 | Mare Energy LLC | Danville, OH 43014 | Oil & Gas Operator | Dec 2023 |
| 18381 | Marexco | | Oil & Gas Operator | Nov 1994 |
| 18382 | Marexco, Inc. | Castle Rock, CO 80104 | Oil & Gas Operator | Jan 2025 |
| 18383 | Margaret Merganser Inc | Tionesta, PA 16353-5853 | Oil & Gas Operator | Dec 2008 |
| 18384 | Maria L. Andrade | | Oil Operator | Dec 2006 |
| 18385 | Mariacher, Matthew | Elma, NY 14059 | Gas Operator | Dec 2023 |
| 18386 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 18387 | Mariah Exploration LLC | Pawhuska, OK 74056 | Oil & Gas Operator | Oct 2008 |
| 18388 | Mariah Operating Company, LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2009 |
| 18389 | Marianas Operating Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 18390 | Marieff Petroleum, Inc. | Sagamore Hills, OH 44067 | Gas Operator | Dec 2023 |
| 18391 | Marienfeld Exploration | Houston, TX 77005 | Oil & Gas Operator | Mar 1994 |
| 18392 | Marienfeld Exploration, Inc. | Ojai, CA 93024 | Oil & Gas Operator | Apr 2025 |
| 18393 | Marietta Royalty Co Inc | Stillwater, OK 74076 | Oil & Gas Operator | Dec 1986 |
| 18394 | Marina Pacifica Oil Company | | Oil & Gas Operator | Dec 1981 |
| 18395 | Marine Cont. & Supply Inc. | | Oil & Gas Operator | Nov 1985 |
| 18396 | Marine Properties, Inc. | | Oil & Gas Operator | Feb 1995 |
| 18397 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 18398 | Marino, Charles B. | Tomball, TX 77377 | Oil & Gas Operator | Apr 2025 |
| 18399 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 18400 | Marion County Prod. Co., L.L.C. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |