| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | O'Sullivan & Scully, Inc. | Oil & Gas Operator | Oct 1994 | |
| 2 | O'Sullivan Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2000 |
| 3 | Ocean Energy, Inc. | Houston, TX 77002 | Oil & Gas Operator | Aug 2003 |
| 4 | Orion Oil & Gas, LLC | Houston, TX 77042 | Oil & Gas Operator | Oct 2007 |
| 5 | Orx Resources, L.L.C. | Houston, TX 77067 | Oil & Gas Operator | Oct 2025 |
| 6 | Osman Global Services LLC | Oil & Gas Operator | Jan 2025 | |
| 7 | Output Acquisition Corp. | Oil & Gas Operator | Jul 2010 |