| 1 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 2 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2025 |
| 3 | Consumers Energy Co | | Oil & Gas Operator | Apr 2010 |
| 4 | D T E Gas Company | | Oil & Gas Operator | Jun 1999 |
| 5 | Energex Petroleum Inc | | Oil Operator | Sep 2019 |
| 6 | Federated Oil And Gas Properties Inc | | Oil & Gas Operator | Aug 2025 |
| 7 | Gout Margaret M Dba Lakeville Gas Associates | | Oil & Gas Operator | Dec 2003 |
| 8 | Hart Energy LLC | | Oil Operator | Aug 2025 |
| 9 | Hawkins Oil Of Michigan Inc | | Oil & Gas Operator | Aug 2003 |
| 10 | K C S Michigan Resources Inc | | Oil & Gas Operator | Mar 2004 |
| 11 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 12 | Lambda Energy Resources LLC | | Oil & Gas Operator | Aug 2025 |
| 13 | Lawrence Exploration Inc | | Oil & Gas Operator | Sep 2004 |
| 14 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Nov 2025 |
| 15 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | May 2025 |
| 16 | Onco Petroleum USA Inc | | Oil Operator | Dec 2009 |
| 17 | Schmude And Pangborn Associates | | Oil & Gas Operator | Apr 1993 |
| 18 | Silver Petroleum Inc | | Gas Operator | Dec 2001 |
| 19 | Smith Petroleum Company | Spring, TX 77389 | Oil & Gas Operator | Nov 2025 |
| 20 | Somoco Inc | | Oil & Gas Operator | Jun 2025 |
| 21 | South Romeo Gas Storage Company LLC | | Gas Operator | Feb 1994 |
| 22 | Tenexco Inc | Oakbrook Terrace, IL 60181 | Gas Operator | Dec 1998 |
| 23 | United Security Associates Inc | | Oil & Gas Operator | Dec 2020 |
| 24 | W 10 Holdings Inc | | Oil & Gas Operator | Dec 1998 |
| 25 | West Bay Exploration Company | Muenster, TX 76252 | Oil & Gas Operator | Aug 2025 |