| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Schlumberger N.V. (Schlumberger Limited) | 4.6% | 296K | 0 | 296K | /s/ Samantha Blons | Assistant Secretary | |
| Schlumberger B.V. | 4.6% | 296K | 0 | 296K | /s/ Eileen Hardell | Secretary | |
| Schlumberger Holdings Corporation | 4.6% | 296K | 0 | 296K | /s/ Ashish Gehi | Treasurer | |
| Schlumberger Technology Corporation | 4.6% | 296K | 0 | 296K | /s/ Ashish Gehi | Treasurer |