| 1 | B H R Petroleum Inc | | Oil & Gas Operator | Apr 2006 |
| 2 | Bannon Energy Inc | Houston, TX 77068 | Oil & Gas Operator | Jun 1998 |
| 3 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 4 | Christian Oil Co | | Oil & Gas Operator | Feb 2025 |
| 5 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 6 | Consumers Energy Co | | Oil & Gas Operator | Apr 2010 |
| 7 | Dart Oil & Gas Corporation | Mason, MI 48854 | Oil & Gas Operator | Jun 2018 |
| 8 | Dynamic Development Inc | | Oil & Gas Operator | Jan 2025 |
| 9 | Exxonmobil Oil Corp | Houston, TX 77210 | Oil & Gas Operator | Feb 2025 |
| 10 | Gage Energy Inc | | Oil Operator | Nov 2015 |
| 11 | GKM Oil Company | Tulsa, OK 74136 | Oil & Gas Operator | Oct 1991 |
| 12 | Kulka And Schmidt Inc | | Oil & Gas Operator | Dec 1992 |
| 13 | Ladd Petroleum Corp. | Denver, CO 80202 | Oil & Gas Operator | Oct 2004 |
| 14 | Lithos Exploration Inc | | Oil & Gas Operator | Nov 2014 |
| 15 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 16 | Michigan Gas Utilities Co | | Oil & Gas Operator | Mar 2011 |
| 17 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Jan 2025 |
| 18 | Michigan Oil Co. | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 19 | Michigan Petroleum Exploration Inc | | Oil & Gas Operator | Oct 2005 |
| 20 | Midway Terrel Operating Co | | Oil & Gas Operator | Dec 1999 |
| 21 | Nuenergy LLC | | Oil & Gas Operator | Jan 2025 |
| 22 | Omimex Energy, Inc. | Fort Worth, TX 76120 | Oil & Gas Operator | Dec 2024 |
| 23 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 24 | Petro Vest Operating LLC | | Oil Operator | Aug 2013 |
| 25 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 26 | R And B Energy Co LLC | | Oil Operator | Dec 2011 |
| 27 | Ranch Production Co | | Oil & Gas Operator | Jul 2000 |
| 28 | Ranch Production LLC | | Oil & Gas Operator | Jan 2025 |
| 29 | Savoy Energy LP | Traverse City, MI 49685-1560-1560 | Oil & Gas Operator | Feb 2025 |
| 30 | Schmude Oil Co | | Oil & Gas Operator | Mar 2014 |
| 31 | Schmude Oil Inc | | Oil & Gas Operator | Feb 2025 |
| 32 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Apr 2025 |
| 33 | Sullivan & Co. | Tulsa, OK 74114 | Oil & Gas Operator | May 2022 |
| 34 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 35 | T X P Inc Formerly Petrotech Inc | | Oil & Gas Operator | Jul 1992 |
| 36 | Terrel Production Co | | Oil & Gas Operator | Dec 2024 |
| 37 | Tolas Oil And Gas Exploration Co | | Oil Operator | Sep 2019 |
| 38 | Trolz Glynn And Associates Inc | | Oil & Gas Operator | Apr 1995 |
| 39 | Well Management Services Inc | | Oil & Gas Operator | Dec 2001 |
| 40 | Wellmaster Production Co LLC | | Oil & Gas Operator | Jul 2015 |