Insider tradingForm 4

Quanterix Corp (QTRX) Insider Trading

2 open-market trades reported since Aug 14, 2026: 2 purchases worth $286K and 0 sales worth $0.

By insider

Insider	Role	Buys	Bought	Sells	Sold	Latest
William P. Donnelly	Director	2	$286K	0	$0	Aug 14, 2026

QTRX insider trades
Filed	Traded	Insider	Role	Type	Shares	Price ($)	Value	Holding	3 mo. after	Filing
Aug 14	Aug 13	William P. DonnellyDirector	Director (ind.)	▲ BUY	72,245	2.93	$212K	+266%		Form 4 ↗
Aug 14	Aug 12	William P. DonnellyDirector	Director (ind.)	▲ BUY	27,155	2.75	$75K	New		Form 4 ↗

Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings