| 1 | J & K Operating Company Inc. | | Oil & Gas Operator | Dec 2024 |
| 2 | J & M Operators | | Oil & Gas Operator | Dec 1997 |
| 3 | J And J Operators LLC | | Oil & Gas Operator | Dec 2024 |
| 4 | J. E. Baker | | Oil Operator | Dec 1998 |
| 5 | J. I. Hathaway Opr. | | Oil & Gas Operator | Dec 1988 |
| 6 | J. L. Davis | | Oil & Gas Operator | Dec 1985 |
| 7 | J. M. Peters Co. Inc. | | Oil & Gas Operator | Dec 1990 |
| 8 | J. M. Van Horn Operator | | Oil Operator | Dec 1989 |
| 9 | J.P. Oil Company LLC | | Oil & Gas Operator | Dec 2024 |
| 10 | Jacat Oil Co. | | Oil Operator | Dec 1990 |
| 11 | Jaco Production Company | Bakersfield, CA 93380 | Oil Operator | Dec 2024 |
| 12 | James C. Thomas III | | Oil & Gas Operator | Dec 1989 |
| 13 | James S. Anderson | | Oil & Gas Operator | Dec 2024 |
| 14 | James Sherman & Dennis Weese | | Oil & Gas Operator | Dec 2024 |
| 15 | Jean Martinez | | Oil Operator | Dec 2024 |
| 16 | Jeanne E. Nevins | | Oil Operator | Dec 2000 |
| 17 | Jeans Well Service | | Gas Operator | Dec 1985 |
| 18 | Jim Graham | | Oil & Gas Operator | Jan 2018 |
| 19 | John A. Thomas | | Oil & Gas Operator | Dec 2024 |
| 20 | John A. Thomas & Linda Thomas | | Oil Operator | Dec 2024 |
| 21 | John Guzman Crane Service Inc. | | Oil & Gas Operator | Dec 2024 |
| 22 | John L. Sowers | | Oil & Gas Operator | Dec 2009 |
| 23 | John M. & W. F. Rohrig | | Oil Operator | Dec 1986 |
| 24 | John N. Dewitt & Paul Graham | | Gas Operator | Dec 1989 |
| 25 | John O. Richardson Operator | | Oil & Gas Operator | Dec 2024 |
| 26 | John Pestana Family Trust | | Oil & Gas Operator | Dec 1994 |
| 27 | John Tedesco | | Oil & Gas Operator | Dec 2024 |
| 28 | Jordan Oil & Gas Company | Healdsburg, CA 95448-1919 | Oil & Gas Operator | Mar 1995 |
| 29 | Joro Inc. | | Oil & Gas Operator | Dec 2024 |
| 30 | JXR Company | | Oil Operator | Dec 1991 |