| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | W. M. Elliott Jr. | Oil & Gas Operator | Dec 2009 | |
| 2 | Weaver & Mola | Oil Operator | Dec 1990 | |
| 3 | Weaver & Weaver | Oil & Gas Operator | Dec 1988 | |
| 4 | Weir Oil Co. Inc. | Oil & Gas Operator | Dec 2007 | |
| 5 | West Energy Operating LLC | Oil & Gas Operator | Dec 2024 | |
| 6 | West Newport Oil Co. | Oil & Gas Operator | Dec 2024 | |
| 7 | Wilco-Placentia Oil Operator LLC | Oil & Gas Operator | Dec 2024 | |
| 8 | WM. H. Brayton Trust | Oil & Gas Operator | Dec 2000 |