Quanterix Corp (QTRX) Insider Ownership

Historic Insider Ownership Trends

QTRX's three largest insider shareholders as of March 23, 2026 are David R Walt (Director, 1.87Mn shares), E Kevin Hrusovsky (Executive Chairman, 910.25K shares), Masoud Toloue (President Ceo, 507.31K shares).

Share ownership in Quanterix is split as 70.89% held by institutions, 9.29% by company executives, and 19.82% by other and public investors.
According to Business Quant data, insider ownership at Quanterix stands at 9.29%, comprising 4.28Mn shares out of 46.06Mn total outstanding.
These holdings increased 2.21% from the prior quarter, rising from 4.19Mn to 4.28Mn shares at Quanterix.
Among company executives at QTRX, Everett Cunningham (President And Ceo) led buying with 1.88Mn shares purchased between December 23, 2025 and March 23, 2026.
Meanwhile, Vandana Sriram (Chief Financial Officer) topped selling at Quanterix, disposing of 5.72K shares over the same 90-day window.

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.

Holder	Position	Shares (Direct)	Report Date
David R Walt		1,872,890	06 Jan, 2026
Masoud Toloue	President Ceo	507,310	20 Jan, 2026
Alan Bruce Sachs		70,099	06 Jan, 2026
Michael Francis Miller	Chief Operating Officer	31,271	17 Mar, 2026
Vandana Sriram	Chief Financial Officer	27,428	16 Mar, 2026
Mark T. Roskey	Svp, Strategic Partnerships	22,325	05 Apr, 2022
Shawn Stetson	Interim Cfo And Treasurer	4,712	13 May, 2021

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.

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Transaction Date	Insider Name	Security Class	Transaction Type	Shares Traded	Price	Shares Remaining	Ownership	Code
15 Mar, 2026	Michael Francis Miller	Common Stock	A	81	-	30,343	D	M
15 Mar, 2026	Michael Francis Miller	Common Stock	D	29	$4.72	30,314	D	F
15 Mar, 2026	Michael Francis Miller	Common Stock	A	136	-	30,450	D	M
15 Mar, 2026	Michael Francis Miller	Common Stock	D	48	$4.72	30,402	D	F
15 Mar, 2026	Michael Francis Miller	Common Stock	A	135	-	30,537	D	M
15 Mar, 2026	Michael Francis Miller	Common Stock	D	48	$4.72	30,489	D	F
15 Mar, 2026	Michael Francis Miller	Common Stock	A	372	-	30,861	D	M
15 Mar, 2026	Michael Francis Miller	Common Stock	D	131	$4.72	30,730	D	F
15 Mar, 2026	Michael Francis Miller	Common Stock	A	834	-	31,564	D	M
15 Mar, 2026	Michael Francis Miller	Common Stock	D	293	$4.72	31,271	D	F
15 Mar, 2026	Michael Francis Miller	Restricted Stock Unit	D	81	$0.00	922	D	M
15 Mar, 2026	Michael Francis Miller	Restricted Stock Unit	D	136	$0.00	1,661	D	M
15 Mar, 2026	Michael Francis Miller	Restricted Stock Unit	D	135	$0.00	3,116	D	M
15 Mar, 2026	Michael Francis Miller	Restricted Stock Unit	D	372	$0.00	9,689	D	M
15 Mar, 2026	Michael Francis Miller	Restricted Stock Unit	D	834	$0.00	8,855	D	M
15 Mar, 2026	Vandana Sriram	Common Stock	A	263	-	26,503	D	M
15 Mar, 2026	Vandana Sriram	Common Stock	D	93	$4.72	26,410	D	F
15 Mar, 2026	Vandana Sriram	Common Stock	A	514	-	26,924	D	M
15 Mar, 2026	Vandana Sriram	Common Stock	D	181	$4.72	26,743	D	F
15 Mar, 2026	Vandana Sriram	Common Stock	A	1,056	-	27,799	D	M

Showing 1 to 20 of 279 transactions

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Quanterix Corp (QTRX) Insider Ownership

Historic Insider Ownership Trends

Top Direct Holders

Recent Insider Transactions

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