| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Parlavecchio Caryn | CHRO | 301 BINNEY STREET, CAMBRIDGE | /s/ Junlin Ho, Attorney-in-Fact for Caryn Parlavecchio | 19 Aug 2025 | 0001922346 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | SRRK | Common Stock | Sale | $67,880 | -2,178 | -1.4% | $31.17 | 155,464 | 18 Aug 2025 | Direct | F1, F2 |
| Id | Content |
|---|---|
| F1 | Represents the number of shares required to be sold by the reporting person to cover the tax withholding obligation in connection with the vesting of restricted stock units ("RSU") on August 15, 2025. This sale is mandated by the Issuer's election under its equity incentive plans to require the reporting person to fund this tax withholding obligation by completing a "sell to cover" transaction with a brokerage firm designated by the Issuer. This sale does not represent a discretionary trade by the reporting person. The shares vested pursuant to awards that were granted on October 26, 2021. Each RSU represents the contingent right to receive upon vesting of the RSU, one share of the Issuer's common stock. The shares subject to these RSU awards are fully vested. |
| F2 | Consists of 66,222 shares of common stock and 89,242 RSUs. |