| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Genomic Health, Inc. | 12% | 6,441,171 | 6,441,171 | 0 | /s/ James Herriott | James Herriott, Secretary | |
| Exact Sciences Corporation | 12% | 6,441,171 | 0 | 6,441,171 | /s/ James Herriott | James Herriott, Senior Vice President, General Counsel and Secretary |