| 18201 | Mark A & Michael J Midlik | Warren, PA 16365-2029 | Oil & Gas Operator | Dec 2015 |
| 18202 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2025 |
| 18203 | Mark F Preddy & Associates,Inc | | Oil & Gas Operator | Dec 1987 |
| 18204 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Mar 2025 |
| 18205 | Mark I Oil Company | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 18206 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 18207 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 18208 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 18209 | Mark Oil, Inc. | Chanute, KS 66720 | Oil Operator | May 2024 |
| 18210 | Mark Petroleum Inc | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2018 |
| 18211 | Mark Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 1987 |
| 18212 | Mark Resources Corp | Pittsburgh, PA 15276 | Oil & Gas Operator | Dec 1993 |
| 18213 | Mark Seifer | | Oil & Gas Operator | Dec 2024 |
| 18214 | Mark T. Kellner Oil Co. | Olean, NY 14760 | Oil & Gas Operator | Dec 2023 |
| 18215 | Mark V Petroleum Company | | Oil & Gas Operator | Feb 2020 |
| 18216 | Markan Oil Incor | | Oil Operator | Mar 1991 |
| 18217 | Markay Oil & Gas Company | Midland, TX 79701 | Oil & Gas Operator | Sep 1998 |
| 18218 | Marker Oil Compa | | Oil Operator | Jul 1985 |
| 18219 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | May 2025 |
| 18220 | Markham, Charles A., Jr. & Janet E. | Gowanda, NY 14070 | Gas Operator | Dec 2023 |
| 18221 | Markley Exploration | Bixby, OK 74008-5332 | Oil & Gas Operator | Jan 2014 |
| 18222 | Markley L C Corporation | Fletcher, OK 73541 | Oil & Gas Operator | Aug 2002 |
| 18223 | Marks & Co., Inc. | | Oil & Gas Operator | Dec 2021 |
| 18224 | Marks And Garner Production LTD Co | Hobbs, NM 88241 | Oil & Gas Operator | Sep 2010 |
| 18225 | Marks Operating LLC | | Oil & Gas Operator | Jul 2016 |
| 18226 | Marksmen Energy USA Inc | Worthington, OH 43085-1270-1270 | Oil Operator | Dec 2020 |
| 18227 | Markus Production | Littleton, CO 80123 | Oil & Gas Operator | Mar 2025 |
| 18228 | Markus Production, Inc | | Oil & Gas Operator | Mar 2021 |
| 18229 | Markwest Resources Inc | Englewood, CO 801125004 | Oil & Gas Operator | Jun 2003 |
| 18230 | Marlan Anderson | | Oil Operator | Jan 2025 |
| 18231 | Marler Philip | Purcell, OK 73080-1522 | Oil & Gas Operator | Nov 2016 |
| 18232 | Marlin And Davis | | Oil Operator | Sep 1987 |
| 18233 | Marlin Coastal, L.L.C. | | Oil & Gas Operator | Apr 2008 |
| 18234 | Marlin Energy Offshore, L.L.C. | | Oil & Gas Operator | Jun 2006 |
| 18235 | Marlin Energy Resources, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2018 |
| 18236 | Marlin Energy Southwest GP, LLC | Lafayette, LA 70503 | Oil & Gas Operator | May 2025 |
| 18237 | Marlin Expl.,Inc&Exchg O&G Co | | Oil & Gas Operator | Jun 1987 |
| 18238 | Marlin Exploration, Inc. | | Oil & Gas Operator | Oct 2006 |
| 18239 | Marlin Exploration, LLC | | Oil & Gas Operator | Mar 2025 |
| 18240 | Marlin Oil Company LLC | Gillette, WY 82718 | Oil & Gas Operator | Mar 2023 |
| 18241 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2025 |
| 18242 | Marlin Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Mar 2025 |
| 18243 | Marlin Pacific Oil & Gas | | Oil & Gas Operator | Dec 2003 |
| 18244 | Marlin Resources, L.L.C. | Midland, TX 79702 | Oil & Gas Operator | Jan 2025 |
| 18245 | Marlin, Bruce W | | Oil Operator | Feb 2025 |
| 18246 | Marline Oil Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 1989 |
| 18247 | Marline Petroleum Corporation | | Oil & Gas Operator | Dec 1985 |
| 18248 | Marlow Environmental LLC | Marlow, OK 73055 | Oil Operator | May 2022 |
| 18249 | Marlyn Company | | Oil & Gas Operator | Dec 2009 |
| 18250 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 18251 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |
| 18252 | Marmac Resources Co. | | Oil & Gas Operator | Mar 2015 |
| 18253 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 18254 | Marmaton Oil Company | Houston, TX 77002 | Oil & Gas Operator | Jul 1998 |
| 18255 | Marmik Oil Compa | | Oil Operator | Jun 1995 |
| 18256 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 18257 | Maroon Energy LLC | Spring, TX 77379 | Oil & Gas Operator | May 2025 |
| 18258 | Maroski, Inc. | | Oil Operator | Jan 1989 |
| 18259 | Marple Petroleum LLC | Edmond, OK 73013 | Oil Operator | Feb 2025 |
| 18260 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 18261 | Marquis Resources, LLC | | Oil & Gas Operator | Jul 2021 |
| 18262 | Marquis-Allred Eng Inc | | Oil & Gas Operator | Apr 1992 |
| 18263 | Marquise Oil Properties Inc | Konawa, OK 74849 | Oil & Gas Operator | Nov 1992 |
| 18264 | Marr Company | | Oil & Gas Operator | Mar 1989 |
| 18265 | Marr, M. H. | Dallas, TX 75201 | Gas Operator | Jan 2002 |
| 18266 | Marrow, N. S. | Austin, TX 78703 | Oil & Gas Operator | Aug 2012 |
| 18267 | Marrs Bros Oil Co Inc | Drumright, OK 74030 | Oil Operator | Sep 1994 |
| 18268 | Marrs, Richard L.(Deceased) | Arkansas City, KS 67005 | Oil & Gas Operator | Feb 2013 |
| 18269 | Marsh Engineering, Inc. | | Oil & Gas Operator | Dec 1990 |
| 18270 | Marsh Lonnie C | Konawa, OK 74849 | Oil & Gas Operator | Dec 2024 |
| 18271 | Marsh Oil & Gas Company | Pauls Valley, OK 73075 | Oil & Gas Operator | Feb 2025 |
| 18272 | Marsh Oil & Gas Field Services, Inc | Sebree, KY 42455 | Oil & Gas Operator | Dec 2023 |
| 18273 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Jan 2025 |
| 18274 | Marsha Azar | | Oil & Gas Operator | Jan 2017 |
| 18275 | Marshall & McCain | | Oil & Gas Operator | Oct 1988 |
| 18276 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2025 |
| 18277 | Marshall Energy, Inc. | Dallas, TX 75243 | Oil & Gas Operator | May 1997 |
| 18278 | Marshall Exploration, Inc. | | Oil & Gas Operator | Jun 1992 |
| 18279 | Marshall Lew L O | | Oil Operator | Jun 1994 |
| 18280 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 18281 | Marshall Oil, LLC | Eureka, KS 67045 | Oil Operator | Jan 2025 |
| 18282 | Marshall Petroleum, Inc. | Houston, TX 77040 | Oil & Gas Operator | Aug 2003 |
| 18283 | Marshall Pipe & Supply Co. | Nocona, TX 76255 | Oil & Gas Operator | Mar 2008 |
| 18284 | Marshall Prod. & Energy Inc. | | Oil & Gas Operator | Jan 1992 |
| 18285 | Marshall Production Co Inc | | Oil & Gas Operator | Jun 1989 |
| 18286 | Marshall R Young Oil Co | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 1996 |
| 18287 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 18288 | Marshall Richard R | Jeromesville, OH 44840 | Oil & Gas Operator | Dec 2023 |
| 18289 | Marshall Young Oil Co | | Oil & Gas Operator | Jan 2007 |
| 18290 | Marshall, A. B. | Houston, TX 77050 | Oil & Gas Operator | Sep 1995 |
| 18291 | Marshall, Dale | | Gas Operator | Dec 1995 |
| 18292 | Marshall, Sam | Granbury, TX 76048 | Oil & Gas Operator | Aug 2010 |
| 18293 | Marshall, Samuel Meek, Estate Of | Granbury, TX 76048 | Oil & Gas Operator | May 2025 |
| 18294 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | May 2025 |
| 18295 | Marshel Inv | | Oil Operator | Oct 1991 |
| 18296 | Marshfield Oil & Gas, LLC | Houston, TX 77070 | Oil & Gas Operator | May 2025 |
| 18297 | Marshland Exploration Company | | Oil & Gas Operator | May 2006 |
| 18298 | Martec Petroleum | | Oil Operator | Jan 1984 |
| 18299 | Martens & Peck Operating Co | | Gas Operator | Feb 1997 |
| 18300 | Martens & Peck Production Co | Denver, CO 80222 | Oil & Gas Operator | Feb 1997 |