SEC Form 4 · accession 0002120516-26-000015
Quanterix Corp · QTRX
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Michael Francis Miller
Officer — Chief Technology Officer
Period of report
Aug 15, 2026
Accepted (ET)
Aug 17, 2026 · 4:14 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0001503274
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF1 | Aug 15, 2026 | M | 81 | — | A | 36,240 | D | |
| Common Stock | Aug 15, 2026 | F | 25 | $2.59 | D | 36,215 | D | |
| Common StockF1 | Aug 15, 2026 | M | 136 | — | A | 36,351 | D | |
| Common Stock | Aug 15, 2026 | F | 41 | $2.59 | D | 36,310 | D | |
| Common StockF1 | Aug 15, 2026 | M | 135 | — | A | 36,445 | D | |
| Common Stock | Aug 15, 2026 | F | 41 | $2.59 | D | 36,404 | D | |
| Common StockF1 | Aug 15, 2026 | M | 372 | — | A | 36,776 | D | |
| Common Stock | Aug 15, 2026 | F | 111 | $2.59 | D | 36,665 | D | |
| Common StockF1 | Aug 15, 2026 | M | 834 | — | A | 37,499 | D | |
| Common Stock | Aug 15, 2026 | F | 249 | $2.59 | D | 37,250 | D |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Stock UnitF2 | $0.00 | Aug 15, 2026 | M | 81 | D | — | — | Common Stock | 81 | 517 | D |
| Restricted Stock UnitF3 | $0.00 | Aug 15, 2026 | M | 136 | D | — | — | Common Stock | 136 | 981 | D |
| Restricted Stock UnitF4 | $0.00 | Aug 15, 2026 | M | 135 | D | — | — | Common Stock | 135 | 2,441 | D |
| Restricted Stock UnitF5 | $0.00 | Aug 15, 2026 | M | 372 | D | — | — | Common Stock | 372 | 7,829 | D |
| Restricted Stock UnitF6 | $0.00 | Aug 15, 2026 | M | 834 | D | — | — | Common Stock | 834 | 25,023 | D |
Explanation of responses
- F1Restricted stock units convert into common stock on a one-for-one basis.
- F2On February 6, 2023, the reporting person was granted 3,929 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter.
- F3On March 15, 2023, the reporting person was granted 6,566 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter.
- F4On February 2, 2024, the reporting person was granted 6,494 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter.
- F5On May 21, 2024, the reporting person was granted 17,878 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter.
- F6On February 4, 2025, the reporting person was granted 40,036 restricted stock units, vesting 25% on the first anniversary of the grant date, with the remaining 75% vesting in 36 equal monthly installments on the 15th day of each month thereafter.