| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Baker Bros. Advisors LP | 19.7% | 1.2M | 1.2M | 0 | /s/ Scott L. Lessing | Scott L. Lessing/ President | 0001263508 |
| Baker Bros. Advisors (GP) LLC | 19.7% | 1.2M | 1.2M | 0 | /s/ Scott L. Lessing | Scott L. Lessing/ President | 0001580575 |
| Julian C. Baker | 19.7% | 1.2M | 1.2M | 0 | /s/ Julian C. Baker | Julian C. Baker | 0001087939 |
| Felix J. Baker | 19.7% | 1.2M | 1.2M | 0 | /s/ Felix J. Baker | Felix J. Baker | 0001087940 |