| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Oasis Petroleum | Gas Operator | Feb 1984 | |
| 2 | Ocean Energy Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 2024 |
| 3 | Oil Producers In | Oil & Gas Operator | Dec 1996 | |
| 4 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Mar 2025 |
| 5 | Oil Prop Company | Oil & Gas Operator | Sep 1995 | |
| 6 | Oil Property Man | Oil & Gas Operator | Jun 1995 | |
| 7 | Oil Tech Producers Corporation | Moundridge, KS 67107 | Gas Operator | Nov 2024 |
| 8 | Oryx Energy Comp | Oil & Gas Operator | Apr 1991 | |
| 9 | Oxford Explorati | Oil & Gas Operator | Mar 1993 | |
| 10 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |