Quanterix (QTRX) Director William Donnelly Buys 99,400 Shares

What Happened

• William P. Donnelly, a director of Quanterix Corp (QTRX), made open-market purchases totaling 99,400 shares of Quanterix common stock. He bought 27,155 shares on 2026-08-12 at a weighted-average price of $2.75 (total $74,676) and 72,245 shares on 2026-08-13 at a weighted-average price of $2.93 (total $211,678). Combined consideration for these purchases was approximately $286,354. Purchases (code P) are acquisitions rather than sales.

Key Details

• Transaction dates and prices:
  • 2026-08-12: 27,155 shares; weighted avg price $2.75 (range $2.58–$2.95 per footnote F1)
  • 2026-08-13: 72,245 shares; weighted avg price $2.93 (range $2.85–$3.13 per footnote F3)
• Shares owned after transaction: Not specified in the filing.
• Ownership note: Shares are owned jointly by trusts established by the reporting person and his spouse (footnote F2).
• Filing timeliness: Form 4 was filed 2026-08-14 for transactions on 8/12 and 8/13 — the report appears to have been filed within the standard Form 4 reporting window (timely).

Context

• Director open-market purchases are commonly viewed by investors as a positive signal because insiders are acquiring stock, but they are one data point and do not prove future performance.
• Footnotes indicate the reported prices are weighted averages across multiple trades; the filer offers to provide a breakdown of individual trade prices on request.