| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Toloue Masoud | President & CEO, Director | C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE, BILLERICA | /s/ Brian Keane, as Attorney-in-Fact | 19 Aug 2025 | 0001867276 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | QTRX | Common Stock | Tax liability | $5,676 | -1,242 | -0.24% | $4.57 | 514,688 | 15 Aug 2025 | Direct | F1, F2 |
| Id | Content |
|---|---|
| F1 | Shares withheld by Quanterix Corporation solely to cover tax obligations upon the vesting of 3,722 RSUs. |
| F2 | Includes 228,813 restricted stock units. |