David R. Walt - 02 Jan 2026 Form 4 Insider Report for Quanterix Corp (QTRX)

Reporting relationship: Director
Issuer ticker: QTRX
Reported as of: 02 Jan 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 06 Jan 2026, 20:11:53 UTC
Prior SEC filing: 03 Oct 2025
Source filing: View source filing
Reporting owner signature: /s/ Bonnie McManus, Attorney-in-Fact

Key filing fact

David R. Walt filed Form 4 for Quanterix Corp (QTRX) on 06 Jan 2026.

Key facts

This page summarizes David R. Walt's Form 4 filing for Quanterix Corp (QTRX).
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 06 Jan 2026, 20:11.

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 0001205236 Primary reporting owner

WALT DAVID R

Relationship: Director
Address: C/O QUANTERIX CORPORATION,, 900 MIDDLESEX TURNPIKE, BILLERICA
Signature: /s/ Bonnie McManus, Attorney-in-Fact
Signature date: 06 Jan 2026

Reported non-derivative transactions

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

QTRX transaction

Common Stock

Award

Transaction value: $0
Shares: +1,215
Change %: +0.06%
Price: $0.000000
Shares after: 1,872,890
Date: 02 Jan 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 fourth quarter of 2025.

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