| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Yorktown Energy Partners X, L.P. | 8.9% | 2,656,705 | 0 | 2,656,705 | /s/ Bryan H Lawrence | Managing Member of the general partner | 0001577919 |
| Yorktown X Company LP | 8.9% | 2,656,705 | 0 | 2,656,705 | /s/ Bryan H Lawrence | Managing Member of the general partner | |
| Yorktown X Associates LLC | 8.9% | 2,656,705 | 0 | 2,656,705 | /s/ Bryan H Lawrence | Managing Member of the general partner |