| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Ocfiw Oil Company, Inc. | Hartington, NE 68739 | Oil & Gas Operator | Dec 2009 |
| 2 | Oil Producers In | Oil & Gas Operator | Dec 1996 | |
| 3 | Oil Prop Company | Oil & Gas Operator | Sep 1995 | |
| 4 | Oil Properties Co., Inc. | Wichita, KS 67208 | Gas Operator | Dec 2009 |
| 5 | Oil Property Man | Oil & Gas Operator | Jun 1995 | |
| 6 | Oil-Tech Prod Co | Oil & Gas Operator | Oct 1992 | |
| 7 | Orca Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Feb 2024 |
| 8 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | May 2024 |