Quanterix Corporation (QTRX) Insider Trading

Last 12 months

Insiders bought $296k on the open market and sold nothing.

Net open-market

+$296k

2 buys · 0 sales

Under a 10b5-1 plan

—

no sales

Insiders who bought / sold

2 / 0

executives and directors

Last open-market buy

Aug 2026

Aug 13, 2026

Get an email when QTRX's executives or directors buy, or make a large sale outside a plan.

Trades · last 2 years

Date	Insider	Trade	Shares	Price	Value	Of their stake	Filing
Aug 12 – 13	William P Donnelly Director	Bought 2 parts	99,400	$2.88 average	$286k	New	Form 4
May 12	Benjamin Meadows Chief Commercial Officer	Bought	3,500	$2.77	$10k	New	Form 4
Sep 12, 2025	Vandana Sriram Chief Financial Officer	Bought	4,150	$4.79	$20k	5.0%	Form 4
Jun 12, 2025 – Jun 13, 2025	David R Walt Director	Bought 2 parts	160,000	$6.16 average	$986k	9.4%	Form 4
Jun 9, 2025	Masoud Toloue President & CEO	Bought	45,900	$5.42	$249k	9.7%	Form 4
Jun 6, 2025 – Jun 9, 2025	David R Walt Director	Bought 2 parts	210,000	$5.40 average	$1.13M	14%	Form 4
Jun 6, 2025	William P Donnelly Director	Bought	93,113	$5.44	$507k	203%	Form 4

Aug 12 – 13
William P Donnelly
Director · bought 99,400 at avg $2.88
$286k
New position
May 12
Benjamin Meadows
Chief Commercial Officer · bought 3,500 at $2.77
$10k
New position
Sep 12, 2025
Vandana Sriram
Chief Financial Officer · bought 4,150 at $4.79
$20k
5.0% of stake
Jun 12, 2025 – Jun 13, 2025
David R Walt
Director · bought 160,000 at avg $6.16
$986k
9.4% of stake
Jun 9, 2025
Masoud Toloue
President & CEO · bought 45,900 at $5.42
$249k
9.7% of stake
Jun 6, 2025 – Jun 9, 2025
David R Walt
Director · bought 210,000 at avg $5.40
$1.13M
14% of stake
Jun 6, 2025
William P Donnelly
Director · bought 93,113 at $5.44
$507k
203% of stake

How to read this. Insiders sell for many reasons: taxes, diversifying, a house. Open-market buys are rarer and say more. A 10b5-1 plan is a trading schedule set up months in advance, so those sales were not timed on news. Large holders (funds and 10% owners) are listed under Everything but not counted as insiders. If you own or watch QTRX, we send a push when an executive buys or makes a large sale outside a plan.

Source: SEC Form 4 filings, filed within two business days of each trade and checked for new ones every hour.

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Spot a number that looks wrong? Check it in QTRX's SEC filings or

Download this analysis as a PDF (Pro)

Data sourced from SEC EDGAR filings and third-party price providers. Scores, valuations, and metrics are algorithmic estimates. This is not investment advice. See our Terms and Methodology.

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