| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| NEEDHAM INVESTMENT MANAGEMENT LLC | 6.11% | 1.78M | 0 | 1.78M | /s/ James W. Giangrasso | James W. Giangrasso, Chief Financial Officer | |
| Needham Asset Management, LLC | 6.11% | 1.78M | 0 | 1.78M | /s/ James W. Giangrasso | James W. Giangrasso, Authorized Person | |
| Needham Aggressive Growth Fund | 5.08% | 1.48M | 0 | 1.48M | /s/ James W. Giangrasso | James W. Giangrasso, Chief Financial Officer | |
| George A. Needham | 6.11% | 1.78M | 0 | 1.78M | George A. Needham | /s/ George A. Needham |