| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Ho Junlin | GENERAL COUNSEL | 301 BINNEY STREET, CAMBRIDGE | /s/ Junlin Ho | 21 Jan 2026 | 0001868114 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | SRRK | Common Stock | Sale | $356,533 | -8,016 | -3.6% | $44.48 | 214,553 | 16 Jan 2026 | 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 January 15, 2026. 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 February 14, 2022 and February 12, 2024. 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 121,471 shares of common stock and 93,082 RSUs. |