| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Yorktown Energy Partners IX, L.P. | 5.6% | 3,097,134 | 0 | 3,097,134 | /s/ Bryan H Lawrence | Managing Member of the general partner of the general partner | 0001503466 |
| Yorktown IX Company LP | 5.6% | 3,097,134 | 0 | 3,097,134 | /s/ Bryan H Lawrence | Managing Member of the general partner | |
| Yorktown IX Associates LLC | 5.6% | 3,097,134 | 0 | 3,097,134 | /s/ Bryan H Lawrence | Managing Member of the general partner |