| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Aba Energy Corporation | Oil & Gas Operator | Aug 2025 | |
| 2 | Allied Energy Corporation | Oil & Gas Operator | Jul 2025 | |
| 3 | Amerada Hess Corp. Unit Operator | Oil & Gas Operator | Dec 1986 | |
| 4 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 5 | Anacapa Oil Corporation | Gas Operator | Jul 2025 | |
| 6 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 7 | Arkoma Production Company Of California | Oil & Gas Operator | Dec 1993 | |
| 8 | Armstrong Petroleum Corporation | Oil & Gas Operator | Jul 2025 | |
| 9 | Arthur J. Arding Jr. | Gas Operator | Dec 1995 | |
| 10 | Aspen Exploration Corporation | Oil & Gas Operator | Dec 2007 | |
| 11 | Atlantic Oil Company | Oil & Gas Operator | Jul 2025 |