| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Ocfiw Oil Company, Inc. | Hartington, NE 68739 | Oil & Gas Operator | Dec 2009 |
| 2 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 3 | Oil Production S | Oil Operator | Sep 1993 | |
| 4 | Oil Property Man | Oil & Gas Operator | Jun 1995 | |
| 5 | Oil Property Management Inc | Attica, KS 67009 | Oil & Gas Operator | Feb 2021 |
| 6 | Oil-Tech Prod Co | Oil & Gas Operator | Oct 1992 | |
| 7 | Osborn Energy, LLC | Bucyrus, KS 66013 | Oil & Gas Operator | Jul 2017 |
| 8 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |