| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Casdin Capital, LLC | 4.3% | 6.73M | 0 | 6.73M | By /s/ Casdin Capital, LLC | Eli Casdin, Managing Member* | 0001534261 |
| Casdin Partners Master Fund, L.P. | 4.1% | 6.37M | 0 | 6.37M | By /s/ Eli Casdin | Eli Casdin, Managing Member of its general partner* | 0001534265 |
| Casdin Partners GP, LLC | 4.1% | 6.37M | 0 | 6.37M | By /s/ Eli Casdin | Eli Casdin, Managing Member* | 0001534260 |
| Eli Casdin | 4.3% | 6.73M | 0 | 6.73M | By /s/ Eli Casdin | Eli Casdin* | 0001534264 |