William P. Donnelly - 01 Oct 2026 Form 4 Insider Report for Quanterix Corp (QTRX)

Reporting relationship: Director
Issuer ticker: QTRX
Reported as of: 01 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Oct 2026, 16:01:26 UTC
Prior SEC filing: 30 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Meghan Shevlin, Attorney-in-Fact

Key filing fact

William P. Donnelly filed Form 4 for Quanterix Corp (QTRX) on 02 Oct 2026.

Key facts

This page summarizes William P. Donnelly's Form 4 filing for Quanterix Corp (QTRX).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 02 Oct 2026, 16:01.

Change

Previous filing in this sequence was filed on 30 Sep 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001207928 Primary reporting owner

DONNELLY WILLIAM P

Relationship: Director
Address: C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE, BILLERICA
Signature: /s/ Meghan Shevlin, Attorney-in-Fact
Signature date: 02 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

QTRX transaction

Common Stock

Award

Transaction value
Shares: +6,964
Change %: +4.3%
Price: $3.41^*
Shares after: 169,365
Date: 01 Oct 2026
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Consists of stock granted in lieu of cash fees for service on the Company's Board of Directors and committees thereof for the third quarter of 2026.

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