| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Oilton Resources, Inc. | Laredo, TX 78041 | Oil & Gas Operator | Apr 2024 |
| 2 | Okla. Magic Circle Energy Corp. | Shawnee, OK 74801 | Oil & Gas Operator | Jul 2004 |
| 3 | Omega Energy Corp. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 4 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 5 | Osborn Heirs Co | San Antonio, TX 78217 | Oil & Gas Operator | Mar 2024 |
| 6 | Outline Oil Corp. | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2024 |
| 7 | Overly Operating Co. | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2013 |