| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| TANG CAPITAL MANAGEMENT, LLC | 3% | 1,641,945 | 0 | 1,641,945 | /s/ Kevin Tang | Manager | |
| KEVIN TANG | 3% | 1,641,945 | 0 | 1,641,945 | /s/ Kevin Tang | Self | |
| TANG CAPITAL PARTNERS, LP | 2.4% | 1,341,945 | 0 | 1,341,945 | /s/ Kevin Tang | Manager, Tang Capital Management, LLC, General Partner | |
| TANG CAPITAL PARTNERS III, INC | 0.6% | 300,000 | 0 | 300,000 | /s/ Kevin Tang | Chief Executive Officer | |
| TANG CAPITAL PARTNERS IV, INC | 0% | 0 | 0 | 0 | /s/ Kevin Tang | Chief Executive Officer |