| 18001 | Mauslein, Lenore | Wellsville, KS 66092 | Oil Operator | Oct 2001 |
| 18002 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Jun 2026 |
| 18003 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 18004 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Sep 2026 |
| 18005 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Sep 2026 |
| 18006 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 18007 | Maverick Exploration And Production Inc | | Oil & Gas Operator | May 2026 |
| 18008 | Maverick Mud Logging, LLC | Eagle Pass, TX 78852 | Oil & Gas Operator | Sep 2026 |
| 18009 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Sep 2026 |
| 18010 | Maverick Oil Company LLC | Pasadena, TX 77505 | Oil Operator | Sep 2026 |
| 18011 | Maverick Oil Corp. | | Oil Operator | May 1997 |
| 18012 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 18013 | Maverick Permian LLC | Keithville, LA 71047 | Oil & Gas Operator | Sep 2026 |
| 18014 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Sep 2026 |
| 18015 | Maverick Producers, Inc. | | Oil Operator | May 2012 |
| 18016 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 18017 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 18018 | Max Oil Company | Blackwell, OK 74631 | Oil & Gas Operator | Apr 2024 |
| 18019 | Max Oil LLC | Andover, KS 67002 | Oil Operator | Dec 2019 |
| 18020 | Max Papay LLC | Meade, KS 67864 | Oil & Gas Operator | Jun 2018 |
| 18021 | Maxam Incorporat | | Oil Operator | Jun 1991 |
| 18022 | Maxcrude, LLC | Winfield, KS 67156 | Oil & Gas Operator | May 2026 |
| 18023 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 18024 | Maxim Drilling & Expl Inc | Gillette, WY 82717 | Oil & Gas Operator | Jul 2026 |
| 18025 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Jun 2026 |
| 18026 | Maxim Energy Inc Dba Maxim Tep Inc | | Oil Operator | Dec 2009 |
| 18027 | Maxim Resources LTD U.S.A. | | Oil & Gas Operator | Dec 1997 |
| 18028 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 18029 | Maximum Energy Development, LLC | Glasgow, KY 42142 | Oil Operator | Dec 2022 |
| 18030 | Maximum Lease Service, Inc | Eunice, NM 88231 | Oil & Gas Operator | Jul 2026 |
| 18031 | Maximum Oil & Gas, Inc | | Gas Operator | Dec 2024 |
| 18032 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 18033 | Maxine Oil Company | Muskogee, OK 74401-0512 | Oil & Gas Operator | Sep 2014 |
| 18034 | Maxland Oil Company | Haslet, TX 76052-5137 | Oil Operator | Nov 2014 |
| 18035 | Maxoil Inc. | | Oil & Gas Operator | Dec 2004 |
| 18036 | Maxson Gas Corp | | Oil & Gas Operator | Dec 2025 |
| 18037 | Maxson Lawrence C | Shinglehouse, PA 16748 | Oil & Gas Operator | Dec 2016 |
| 18038 | Maxum Energy Corp | Plano, TX 75025 | Oil & Gas Operator | Jan 2003 |
| 18039 | Maxus Exploratio | | Oil Operator | Jun 1991 |
| 18040 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 18041 | Maxwell Bros | | Oil & Gas Operator | Dec 2025 |
| 18042 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 18043 | Maxwell Operating Co., Inc. | Englewood, CO 80155 | Oil Operator | Jan 2007 |
| 18044 | Maxwell Resources Corporation | Oklahoma City, OK 73159 | Oil & Gas Operator | Apr 2009 |
| 18045 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 18046 | Maxwell, Richard | Wichita Falls, TX 76301 | Oil & Gas Operator | May 1995 |
| 18047 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 18048 | May Energy Company | Stroud, OK 74079 | Oil & Gas Operator | May 2013 |
| 18049 | May Gas, Inc. | | Oil & Gas Operator | Dec 2008 |
| 18050 | May Investments, Inc. | New Boston, TX 75570 | Oil & Gas Operator | Aug 2003 |
| 18051 | May Oil & Gas, L.L.C. | | Oil & Gas Operator | Dec 2013 |
| 18052 | May Petroleum Inc | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 18053 | Maya Oil LLC | | Oil Operator | Jun 2026 |
| 18054 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Oct 2025 |
| 18055 | Maybrier Brothers | | Oil Operator | Apr 2006 |
| 18056 | Maybrier Production, L.L.C. | | Oil Operator | Oct 2022 |
| 18057 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Sep 2026 |
| 18058 | Mayes Donald W & Associates | Piedmont, OK 73078-0051 | Oil & Gas Operator | Dec 1996 |
| 18059 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 18060 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Sep 2026 |
| 18061 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Sep 2026 |
| 18062 | Mayfield SWD LLC | McKinney, TX 75070-5020 | Oil Operator | Aug 2021 |
| 18063 | Mayhar N D | Eufaula, OK 74432 | Oil Operator | Apr 2015 |
| 18064 | Mayhew Properties | | Gas Operator | May 2026 |
| 18065 | Mayjac I, LLC | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 18066 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 18067 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 18068 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 18069 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 18070 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Sep 2026 |
| 18071 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Sep 2026 |
| 18072 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 18073 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 18074 | Mays Coal Co | | Gas Operator | Dec 2003 |
| 18075 | Mays Gas & Coal Co | Clarion, PA 16214-0447 | Oil & Gas Operator | Dec 2025 |
| 18076 | Mays Oil LLC | | Oil Operator | Apr 2021 |
| 18077 | Mays, Sam W., Jr. Estate | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2005 |
| 18078 | Mayshark, James Page | Sherman, NY 14781 | Gas Operator | Dec 2025 |
| 18079 | Mazco Energy LLC | San Antonio, TX 78266 | Oil & Gas Operator | Sep 2026 |
| 18080 | Mazurkiewicz, Gary, Kimberly, Matt | Perrysburg, NY 14129 | Gas Operator | Dec 2025 |
| 18081 | MB Energy, LLC | San Antonio, TX 78233 | Oil & Gas Operator | Sep 2026 |
| 18082 | MB Exploration, LLC | Dallas, TX 75380 | Oil & Gas Operator | Jul 2008 |
| 18083 | MB Holdings LLC | Independence, KS 67301 | Oil Operator | May 2026 |
| 18084 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 18085 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 18086 | Mbi Oil & Gas LLC | Dickinson, ND 58601 | Oil & Gas Operator | Jun 2026 |
| 18087 | MBM Partnership | | Gas Operator | Nov 1991 |
| 18088 | MBM Production, LLC | Pikeville, KY 41501 | Oil & Gas Operator | Dec 2024 |
| 18089 | Mbo, LLC | | Oil Operator | Jan 2025 |
| 18090 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Sep 2026 |
| 18091 | MBS Resources Inc | Wilcox, PA 15870-1810 | Oil & Gas Operator | Dec 2025 |
| 18092 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Sep 2026 |
| 18093 | MC C Oil Co Inc | Sedan, KS 67361 | Oil Operator | Apr 2016 |
| 18094 | MC Glover, LLC | Albany, TX 76430 | Oil Operator | Aug 2025 |
| 18095 | MC Panhandle, Inc. | Tulsa, OK 74102 | Gas Operator | Jul 1998 |
| 18096 | MC1 Consulting, Inc. | San Antonio, TX 78209 | Oil Operator | Sep 2025 |
| 18097 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | Sep 2026 |
| 18098 | McAdams Roux & Associates | Denver, CO 80202 | Oil & Gas Operator | Dec 1999 |
| 18099 | McAdams, J F | | Oil Operator | May 1971 |
| 18100 | McAlester Fuel Co. | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |