QTRX insider trading — Quanterix Corp
Over the last 90 days, insiders at Quanterix Corp (QTRX) made 2 open-market purchases worth $286K and 0 open-market sales worth $0, making them net buyers by $286K. The largest purchase was by Donnelly William P (Director), who bought 72,245 shares for $212K on Aug 13, 2026.
Updated Oct 16, 2026.
Recent QTRX insider transactions
Every Form 4 filed by Quanterix Corp officers, directors and 10% owners in the last 90 days, newest first. P = open-market purchase, S = open-market sale; other codes are awards, option exercises, tax withholding or gifts.
| Trade date | Insider | Role | Type | Ownership | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|---|
| Oct 2, 2026 | Magovcevic-Liebisch Ivana | Director | M · Option exercise | Direct | 4,224 | — | — | Form 4 |
| Oct 1, 2026 | Mendel Scott | Director | A · Grant/award | Direct | 4,398 | $3.41 | $15K | Form 4 |
| Oct 1, 2026 | Donnelly William P | Director | A · Grant/award | Direct | 6,964 | $3.41 | $24K | Form 4 |
| Sep 15, 2026 | Miller Michael Francis | Chief Technology Officer | M · Option exercise | Direct | 1,558 | — | — | Form 4 |
| Sep 15, 2026 | Miller Michael Francis | Chief Technology Officer | F · Tax withholding | Direct | 467 | $2.72 | $1K | Form 4 |
| Aug 31, 2026 | Miller Michael Francis | Chief Technology Officer | M · Option exercise | Direct | 159 | — | — | Form 4 |
| Aug 31, 2026 | Miller Michael Francis | Chief Technology Officer | F · Tax withholding | Direct | 48 | $2.67 | $128 | Form 4 |
| Aug 19, 2026 | Elliott Jeffrey Thomas | Director | M · Option exercise | Direct | 3,955 | — | — | Form 4 |
| Aug 17, 2026 | Donnelly William P | Director | M · Option exercise | Direct | 2,802 | — | — | Form 4 |
| Aug 15, 2026 | Miller Michael Francis | Chief Technology Officer | M · Option exercise | Direct | 1,558 | — | — | Form 4 |
| Aug 15, 2026 | Miller Michael Francis | Chief Technology Officer | F · Tax withholding | Direct | 467 | $2.59 | $1K | Form 4 |
| Aug 13, 2026 | Donnelly William P | Director | P · Purchase | Indirect | 72,245 | $2.93 | $212K | Form 4 |
| Aug 12, 2026 | Donnelly William P | Director | P · Purchase | Indirect | 27,155 | $2.75 | $75K | Form 4 |
| Jul 31, 2026 | Miller Michael Francis | Chief Technology Officer | M · Option exercise | Direct | 130 | — | — | Form 4 |
| Jul 31, 2026 | Miller Michael Francis | Chief Technology Officer | F · Tax withholding | Direct | 39 | $3.48 | $136 | Form 4 |
QTRX insider trading FAQ
Are insiders buying QTRX stock?
Yes. In the last 90 days, Quanterix Corp insiders made 2 open-market purchases totaling $286K, and no open-market sales. Purchases with the insider's own money are generally seen as a stronger signal than sales, which happen for many reasons (taxes, diversification, planned 10b5-1 sales).
Who are the insiders trading QTRX?
Recent buyers: Donnelly William P.
Where does QTRX insider trading data come from?
Every transaction comes from SEC Form 4 filings on EDGAR. Company officers, directors and 10% owners must file a Form 4 within two business days of buying or selling. InsiderBolt reads these filings directly from the SEC.
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Insider trading data is for informational purposes only and is not investment advice. Filings can be amended; always confirm details on SEC EDGAR.