X0609 4 2026-04-01 false 0001503274 Quanterix Corp QTRX 0001207928 DONNELLY WILLIAM P false C/O QUANTERIX CORPORATION 900 MIDDLESEX TURNPIKE BILLERICA MA 01821 true true false false Executive Chair false Common Stock 2026-04-01 4 A false 6178.00 0.00 A 154127.00 D Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the first quarter of 2026. /s/ Bonnie McManus, as Attorney-in-Fact 2026-04-03