| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| TANG CAPITAL MANAGEMENT, LLC | 6.4% | 1,682,502 | 0 | 1,682,502 | /s/ Kevin Tang | Manager | |
| KEVIN TANG | 6.4% | 1,682,502 | 0 | 1,682,502 | /s/ Kevin Tang | Self | |
| TANG CAPITAL PARTNERS, LP | 5.9% | 1,555,862 | 0 | 1,555,862 | /s/ Kevin Tang | Manager, Tang Capital Management, LLC, General Partner | |
| TANG CAPITAL PARTNERS III, INC | 0.5% | 126,640 | 0 | 126,640 | /s/ Kevin Tang | Chief Executive Officer | |
| TANG CAPITAL PARTNERS IV, INC | 0% | 0 | 0 | 0 | /s/ Kevin Tang | Chief Executive Officer |