| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Seagull Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2025 |
| 2 | Secan Oil Co., Inc. | Oil & Gas Operator | May 1987 | |
| 3 | Serio Energy Corporation | Oil & Gas Operator | Jul 2000 | |
| 4 | Serio Operating Company | Oil & Gas Operator | Mar 2007 | |
| 5 | Serio-Punches Oil Co | Oil Operator | Jan 2008 | |
| 6 | Shield Resources Inc | Oil & Gas Operator | Nov 1987 | |
| 7 | Stratco Operating Co Inc | Austin, TX 78701 | Oil & Gas Operator | Oct 2025 |
| 8 | Stroud Petroleum, Inc. | Shreveport, LA 71162 | Oil & Gas Operator | Oct 2025 |
| 9 | Sun Exploration-Production Co. | Oil & Gas Operator | Jan 1990 | |
| 10 | Sundown Energy LP | Dallas, TX 75248 | Oil & Gas Operator | Oct 2025 |