Are insiders buying QTRX stock?

Yes — 4 distinct insiders have bought QTRX (Quanterix Corp) on the open market, including 2 cluster buys where two or more insiders bought within a rolling window. The most recent qualifying activity was Sep 17, 2025.

How much QTRX stock have insiders bought?

Insiders have bought a combined $3.7M of QTRX across 9 open-market purchases, based on SEC Form 4 filings.

What is an insider cluster buy in QTRX?

A cluster buy is two or more distinct Quanterix Corp insiders — officers, directors, or 10% owners — each buying QTRX on the open market within a rolling window. QTRX has 2 detected cluster buys to date.

Where does this QTRX insider trading data come from?

Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

QTRX insider buying

2 cluster buys

Quanterix Corp · Healthcare

When two or more insiders at Quanterix Corp buy QTRX on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in QTRX plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.

Clusters

Distinct insiders

Total bought

$3.7M

Market cap

$204.4M

Detected clusters

Jun 6 – Jun 13, 2025
Detected Jun 13, 2025
High conviction3 insiders
Total bought
$2.9M
Market cap
$204.4M
Aug 13 – Aug 20, 2024
Detected Aug 20, 2024
High conviction2 insiders
Total bought
$831.7K
Market cap
$204.4M

All notable open-market buys in QTRX

Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.

Date	Insider	Shares	Price	Value	Filing
Sep 12, 2025	Sriram Vandana Chief Financial Officer	4,150	$4.79	$19.9K	SEC ↗
Jun 13, 2025	WALT DAVID Rcluster Director	123,990	$6.14	$761.3K	SEC ↗
Jun 12, 2025	WALT DAVID Rcluster Director	36,010	$6.23	$224.3K	SEC ↗
Jun 9, 2025	WALT DAVID Rcluster Director	78,131	$5.34	$417.2K	SEC ↗
Jun 9, 2025	Toloue Masoudcluster Director, President & CEO	45,900	$5.42	$248.8K	SEC ↗
Jun 6, 2025	WALT DAVID Rcluster Director	131,869	$5.43	$716.0K	SEC ↗
Jun 6, 2025	DONNELLY WILLIAM Pcluster Director	93,113	$5.44	$506.5K	SEC ↗
Aug 20, 2024	WALT DAVID Rcluster Director	47,000	$13.29	$624.6K	SEC ↗
Aug 13, 2024	Toloue Masoudcluster Director, President & CEO	19,000	$10.90	$207.1K	SEC ↗

More Healthcare stocks with insider cluster buys

All insider buying in Healthcare →

QTRX insider buying — FAQ

Are insiders buying QTRX stock?: Yes — 4 distinct insiders have bought QTRX (Quanterix Corp) on the open market, including 2 cluster buys where two or more insiders bought within a rolling window. The most recent qualifying activity was Sep 17, 2025.
How much QTRX stock have insiders bought?: Insiders have bought a combined $3.7M of QTRX across 9 open-market purchases, based on SEC Form 4 filings.
What is an insider cluster buy in QTRX?: A cluster buy is two or more distinct Quanterix Corp insiders — officers, directors, or 10% owners — each buying QTRX on the open market within a rolling window. QTRX has 2 detected cluster buys to date.
Where does this QTRX insider trading data come from?: Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.

How we track insider buying in QTRX

We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy QTRX within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?

This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding QTRX.