| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H.L. Hall & Sons LLC | Oil & Gas Operator | Dec 2011 | |
| 2 | Harry Feder | Oil & Gas Operator | Dec 1999 | |
| 3 | Harter Energy Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 2023 |
| 4 | Hartley Natural Resource Development | Oil & Gas Operator | Nov 2023 | |
| 5 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Apr 2024 |
| 6 | Hathaway Company | Oil & Gas Operator | Nov 2023 | |
| 7 | Hathaway LLC | Oil & Gas Operator | Nov 2023 | |
| 8 | Havens Oil Company | Early, TX 76803 | Oil & Gas Operator | Nov 2023 |
| 9 | Hershey Oil Corporation | Seminole, TX 79360 | Oil & Gas Operator | Jul 1992 |
| 10 | Hexadyne Energy Corp. | Oil & Gas Operator | Dec 2013 | |
| 11 | Hickory-National Co. | Oil Operator | Dec 1986 | |
| 12 | Hilliard Oil & Gas Inc | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 13 | Hoc Ca LLC | Oil & Gas Operator | Nov 2023 | |
| 14 | Holmes Western Oil Corporation | Oil & Gas Operator | Dec 2023 | |
| 15 | Howard E. Caywood Inc. | Oil & Gas Operator | Dec 2023 | |
| 16 | Hoyt Energy L.L.C. | Oil Operator | Dec 2023 | |
| 17 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 18 | Hubl/Harbin | Oil Operator | Dec 1994 | |
| 19 | Hunter Edison Oil Development Limited Partnership | Oil & Gas Operator | Nov 2023 | |
| 20 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 21 | Hvi Cat Canyon Inc. | Oil & Gas Operator | Nov 2023 |