| 19001 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 19002 | Mer-Bar Exploration Co Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 1992 |
| 19003 | Mercantile Oil & Gas Prod. Corp. | Galena Park, TX 77547 | Oil & Gas Operator | Jun 2016 |
| 19004 | Mercer Oil And Gas Co Inc | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 19005 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 19006 | Mercury Exploration Co. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 19007 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Dec 2025 |
| 19008 | Mercury Petroleum Company, Inc | | Oil Operator | Dec 2018 |
| 19009 | Mercury Resources LLC | | Oil & Gas Operator | Oct 2025 |
| 19010 | Meredith Enterprises | | Oil Operator | Jun 1988 |
| 19011 | Mereken Energy Corp. | Fort Worth, TX 76102 | Gas Operator | Feb 2006 |
| 19012 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 19013 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 19014 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 19015 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 19016 | Meridian Energy Inc. | | Oil Operator | Jun 2025 |
| 19017 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 19018 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 19019 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 19020 | Meridian Oil & Gas Enter | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 19021 | Meridian Oil & Gas Enterprises Inc | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 19022 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 19023 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 19024 | Meridian Oil Offshore Inc. | | Oil & Gas Operator | Aug 1996 |
| 19025 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 19026 | Meridian Production Services LLC | | Oil & Gas Operator | Aug 2025 |
| 19027 | Meridian Resource & Expl Co, The | Houston, TX 77077 | Oil & Gas Operator | Dec 2000 |
| 19028 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 19029 | Meridian Resources (USA) Inc. | | Oil & Gas Operator | Aug 2024 |
| 19030 | Meridian Resources LLC | Evansville, IN 47715 | Oil Operator | Jul 2024 |
| 19031 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 19032 | Merit Energy Co. Dba Alabama Merit Energy Co., Inc. | | Oil & Gas Operator | Aug 2005 |
| 19033 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 19034 | Merit Energy Company, LLC | Dallas, TX 75009 | Oil & Gas Operator | Jun 2025 |
| 19035 | Merit Field LLC | | Oil & Gas Operator | Dec 2001 |
| 19036 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 19037 | Merit Productions | | Oil Operator | Sep 1996 |
| 19038 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 19039 | Meritage Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 19040 | Meritage Homes Of California Inc. | | Oil Operator | Dec 2020 |
| 19041 | Merkaz Drilling, LLC | Dallas, TX 75229 | Oil Operator | Dec 2025 |
| 19042 | Merkin LLC | Austin, TX 78737 | Oil Operator | Dec 2025 |
| 19043 | Merl Wiggins Et Al | | Oil & Gas Operator | Sep 1996 |
| 19044 | Merlin J Verret | | Gas Operator | Jun 1986 |
| 19045 | Merlon Texas, Inc. | Houston, TX 77056 | Oil Operator | Jun 2013 |
| 19046 | Mermac Operating Company Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 19047 | Meroda Resources LLC | Mustang, OK 73064-9408 | Oil & Gas Operator | Apr 2000 |
| 19048 | Merrick Oil & Gas | | Oil & Gas Operator | Mar 2025 |
| 19049 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 19050 | Merrico Resource | | Oil Operator | Dec 1996 |
| 19051 | Merrico Resources | | Oil Operator | Mar 1992 |
| 19052 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |
| 19053 | Merrill Natural Res Inc | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 1985 |
| 19054 | Merrill Operating, LLC | Snyder, TX 79550 | Oil Operator | Apr 2016 |
| 19055 | Merrill, Brian G. | Depew, NY 14043 | Gas Operator | Dec 2024 |
| 19056 | Merrimac Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 19057 | Merrimac Oil & Gas LLC | Houston, TX 77054 | Gas Operator | Dec 2008 |
| 19058 | Merrion & Bayless | Farmington, NM 87401 | Oil & Gas Operator | May 1982 |
| 19059 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Oct 2025 |
| 19060 | Merritt Oil Comp | | Oil Operator | Jan 1990 |
| 19061 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Dec 2025 |
| 19062 | Merritt, William Kevin | Dallas, TX 75225 | Oil & Gas Operator | Dec 1994 |
| 19063 | Mert Development Inc | | Oil & Gas Operator | Dec 2021 |
| 19064 | Merta, Mike | Alice, TX 78333 | Oil & Gas Operator | Aug 2005 |
| 19065 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2025 |
| 19066 | Mervin Troyer | Union City, PA 16438-8510 | Gas Operator | Dec 2008 |
| 19067 | Mervine Oil Company Inc | Blackwell, OK 74631-0514 | Oil Operator | Jan 2013 |
| 19068 | Merzbacher, George F. Jr. | Robstown, TX 78380 | Oil & Gas Operator | May 1994 |
| 19069 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 19070 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 19071 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | Aug 2025 |
| 19072 | Mesa Gulf Coast LLC | | Oil & Gas Operator | Dec 2020 |
| 19073 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 19074 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 19075 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 19076 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 19077 | Mesa Petroleum C | | Oil & Gas Operator | Dec 1986 |
| 19078 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 19079 | Mesa Production Company | Amarillo, TX 79189 | Oil & Gas Operator | Dec 1983 |
| 19080 | Mesa Ridge Holdings LLC | Abilene, TX 79603 | Oil Operator | Dec 2025 |
| 19081 | Mesa VIsta Operating, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 19082 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 19083 | Mescko Operating & Prod | Seville, OH 44273 | Oil & Gas Operator | Oct 2025 |
| 19084 | Mescko Producing & Operating Co. Inc. | Burbank, OH 44214 | Oil & Gas Operator | Dec 2024 |
| 19085 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2024 |
| 19086 | Mesquite Land & Minerals Co. | Albany, TX 76430 | Oil Operator | Dec 2025 |
| 19087 | Mesquite Oil & Gas | Olney, TX 76374 | Oil & Gas Operator | Sep 2025 |
| 19088 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 19089 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Dec 2025 |
| 19090 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Jun 2025 |
| 19091 | Messer Helium Cliffside LLC | Bridgewater, NJ 08807 | Gas Operator | Dec 2025 |
| 19092 | Messer LLC | | Gas Operator | Oct 2025 |
| 19093 | Messman Corporation | Wichita, KS 67208 | Oil & Gas Operator | Jun 2025 |
| 19094 | Messman-Rinehart | | Oil & Gas Operator | Mar 1991 |
| 19095 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | Dec 2025 |
| 19096 | Mestena Operating, L.L.C. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2015 |
| 19097 | Mestena Operating, LTD. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jun 2009 |
| 19098 | Mestena, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Nov 2001 |
| 19099 | Metairie Energy Company, Inc. | | Oil & Gas Operator | Nov 2019 |
| 19100 | Metano Energy III, LP | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |