William P. Donnelly - 20 Nov 2025 Form 4 Insider Report for Quanterix Corp (QTRX)

Reporting relationship: Executive Chair, Director
Issuer ticker: QTRX
Reported as of: 20 Nov 2025
Net transaction value: $0
SEC form: 4
Accepted by SEC: 24 Nov 2025, 19:07:14 UTC
Prior SEC filing: 03 Oct 2025
Next SEC filing: 02 Jan 2026
Source filing: View source filing
Reporting owner signature: /s/ Bonnie McManus, as Attorney-in-Fact

Key filing fact

William P. Donnelly filed Form 4 for Quanterix Corp (QTRX) on 24 Nov 2025.

Key facts

This page summarizes William P. Donnelly's Form 4 filing for Quanterix Corp (QTRX).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 24 Nov 2025, 19:07.

Change

Previous filing in this sequence was filed on 03 Oct 2025.
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: Executive Chair, Director
Address: C/O QUANTERIX CORPORATION, 900 MIDDLESEX TURNPIKE, BILLERICA
Signature: /s/ Bonnie McManus, as Attorney-in-Fact
Signature date: 24 Nov 2025

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

QTRX transaction Derivative

Stock Options (Right to buy)

Award

Transaction value: $0
Shares: +70,091
Change %
Price: $0.000000
Shares after: 70,091
Date: 20 Nov 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 70,091
Exercise price: $5.91
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

The stock options vest monthly over two years in 24 equal installments, subject to the Reporting Person's provision of service to the Issuer on each vesting date.