# Quanterix (QTRX): value investors who own it | moatshark

1 value investor held Quanterix in their Q3 2026 13F, led by First Eagle Investment Management.

## 13F holders

| Manager | Portfolio | Value | Change | Quarters held |
| --- | --- | --- | --- | --- |
| First Eagle Investment Management | 0.0% | $11.9m | Added +112% | 3 |

## Directors buying and selling (Form 4, last 12 months)

| Date | Who | Role | Bought or sold | Shares | Value |
| --- | --- | --- | --- | --- | --- |
| 2026-08-13 | DONNELLY WILLIAM P | Director | Bought | 72245 | $212k |
| 2026-08-12 | DONNELLY WILLIAM P | Director | Bought | 27155 | $75k |

Source: SEC filings, via moatshark (https://www.moatshark.com/s/qtrx). Values traded and returns are estimates. Not investment advice. Built 2026-10-21.