| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Yorktown Energy Partners XI, L.P. | 10% | 4,432,261 | 0 | 4,432,261 | /s/ Bryan H Lawrence | Managing Member of the general partner of the general partner | 0001667954 |
| YORKTOWN XI COMPANY LP | 10% | 4,432,261 | 0 | 4,432,261 | /s/ Bryan H Lawrence | Managing Member of the general partner | |
| YORKTOWN XI ASSOCIATES LLC | 10% | 4,432,261 | 4,432,261 | 0 | /s/ Bryan H Lawrence | Managing Member |