| 1 | K & J Oil Co. Inc. | | Oil & Gas Operator | Sep 2025 |
| 2 | K. G. H. Enterprises | | Oil Operator | Dec 2003 |
| 3 | K. J. Enterprises LLC | | Oil Operator | Dec 2001 |
| 4 | K.B. Oil & Gas | | Oil & Gas Operator | Sep 2025 |
| 5 | Kaiser Energy Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 1990 |
| 6 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2025 |
| 7 | Kalco Development Corporation | | Gas Operator | Dec 1989 |
| 8 | Kaye R. McCown | | Oil Operator | Jun 2012 |
| 9 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Aug 2025 |
| 10 | Kelpetro Operating Inc. | | Oil & Gas Operator | Dec 2021 |
| 11 | Kelt Oil & Gas, Inc. | Torrance, CA 90503 | Oil & Gas Operator | Dec 2003 |
| 12 | Kem Enterprise Inc. | | Oil & Gas Operator | Sep 2025 |
| 13 | Kenneth H. Hunter Jr. | | Oil & Gas Operator | Dec 1991 |
| 14 | Kenneth H. Hunter Jr. Trustee Of The Hunter Living Trust | | Oil & Gas Operator | Dec 2001 |
| 15 | Kenneth Lopez And Conway Lopez | | Oil & Gas Operator | Sep 2025 |
| 16 | Kenneth Sperry | | Oil & Gas Operator | Dec 1992 |
| 17 | Kern Front-Section 35-Partners | | Oil & Gas Operator | Sep 2025 |
| 18 | Kern River Holdings II LLC | | Oil & Gas Operator | Oct 2025 |
| 19 | Kernview Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 20 | Key Production Company, Inc. | Longview, TX 75606 | Oil & Gas Operator | Aug 2025 |
| 21 | KLD Energy | | Oil & Gas Operator | Dec 2015 |
| 22 | KMD Operating Company LLC | | Oil & Gas Operator | Dec 2015 |
| 23 | KMP Operating Inc. | | Oil Operator | Sep 2025 |
| 24 | Koch Exploration Company | Houston, TX 77046 | Oil & Gas Operator | Apr 2003 |
| 25 | Kore Energy LLC | | Oil & Gas Operator | Sep 2025 |
| 26 | Kraemer II LLC | | Oil & Gas Operator | Dec 2000 |
| 27 | Krummrich Engineering Corporation | | Oil & Gas Operator | Sep 2025 |