| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Oasis Petroleum | Gas Operator | Feb 1984 | |
| 2 | Oil Producers In | Oil & Gas Operator | Dec 1996 | |
| 3 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Mar 2025 |
| 4 | Oil Prop Company | Oil & Gas Operator | Sep 1995 | |
| 5 | Oil Property Man | Oil & Gas Operator | Jun 1995 | |
| 6 | Oneok Exploratio | Oil & Gas Operator | Mar 1995 | |
| 7 | Oryx Energy Comp | Oil & Gas Operator | Apr 1991 | |
| 8 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 9 | Oxford Explorati | Oil & Gas Operator | Mar 1993 |