| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Needham Investment Management LLC | 1.4% | 460K | 0 | 460K | By: /s/ James W. Giangrasso | James W. Giangrasso / Chief Financial Officer | |
| Needham Asset Management, LLC | 1.4% | 460K | 0 | 460K | By: /s/ James W. Giangrasso | James W. Giangrasso / Authorized Person | |
| Needham Aggressive Growth Fund | 1.4% | 460K | 0 | 460K | By: /s/ James W. Giangrasso | James W. Giangrasso / Chief Financial Officer | |
| George A. Needham | 1.4% | 460K | 0 | 460K | By: /s/ George A. Needham | George A. Needham |