| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 2 | Oil Property Management Inc | Attica, KS 67009 | Oil & Gas Operator | Feb 2021 |
| 3 | Oil-Tech Prod Co | Oil & Gas Operator | Oct 1992 | |
| 4 | Okmar Oil Compan | Oil & Gas Operator | Feb 1995 | |
| 5 | Okt Resources, LLC | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 6 | Oleum Incorporat | Gas Operator | Dec 1990 | |
| 7 | Oneok Exploratio | Oil & Gas Operator | Mar 1995 | |
| 8 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 9 | Osage Resources, LLC | Wichita, KS 67202 | Oil & Gas Operator | May 2025 |
| 10 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |