| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Botto And Miller Trustees | Oil & Gas Operator | Dec 1993 | |
| 2 | Costa Loma LTD. | Oil & Gas Operator | Sep 2025 | |
| 3 | Deuel Petroleum Company Inc. | Oil & Gas Operator | Dec 1999 | |
| 4 | John Tedesco | Oil & Gas Operator | Sep 2025 | |
| 5 | La Honda Fields Limited Partnership | Oil & Gas Operator | Dec 2021 | |
| 6 | Peninsula Open Space Trust | Oil & Gas Operator | Dec 2008 |