Quanterix QTRX Insider Ownership

NASDAQ QTRX
$2.65 -0.08 (-2.97%)
As of: Sep 9, 2026 · 12:44 PM EDT

Insider Holdings by Owner

4.63Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
0.633%
■0% pp QoQ
Shares Held by Insiders
291.54K
filed for Sep 2026
■0.00% QoQ
Shares Outstanding
46.06Mn
46,060,000 shares
Direct Holdings
36.91K
Indirect: 254.63K
Net Shares Traded (QoQ)
0
no net change in Sep 2026
Insiders Holding Shares
25
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 30 Sep, 2026

As of September 09, 2026, the three largest insider holders of QTRX are David R Walt (Director, 1.87Mn shares), David R Walt (Director, 1.87Mn shares), David R Walt (Director, 1.87Mn shares).

Form 4 Holdings

Insiders Holding QTRX

Insiders 25
Shares held 4.63Mn
Of outstanding 10.06%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 David R Walt Director 1,872,890 0 1,872,890 40.4% 06 Jan, 2026
2 E Kevin Hrusovsky Executive Chairman 910,249 0 910,249 19.6% 06 Jul, 2022
3 Masoud Toloue President Ceo 507,310 0 507,310 10.9% 20 Jan, 2026
4 Paul M Meister Director 313,253 0 313,253 6.8% 07 Jan, 2026
5 William P Donnelly Executive Chair 162,401 0 162,401 3.5% 19 Aug, 2026
6 Keith Crandell Director 131,236 0 131,236 2.8% 04 Apr, 2023
7 Michael A Doyle Cfo And Treasurer 88,332 0 88,332 1.9% 02 Oct, 2023
8 Alan Bruce Sachs Director 70,099 0 70,099 1.5% 06 Jan, 2026
9 Malcolm Garret Hampton Director 70,099 0 70,099 1.5% 06 Jan, 2026
10 Sarah E. Hlavinka Director 60,070 0 60,070 1.3% 03 Jul, 2025
11 Karen Flynn Director 57,212 0 57,212 1.2% 06 Jan, 2026
12 David C. Duffy Svp Rd And Cto 54,730 0 54,730 1.2% 28 Mar, 2022
13 Ivana Magovcevic-Liebisch Director 43,607 0 43,607 0.9% 06 Jan, 2026
14 John J Fry General Counsel Secretary 37,671 0 37,671 0.8% 03 Aug, 2022
15 Michael Francis Miller Chief Technology Officer 37,361 0 37,361 0.8% 01 Sep, 2026
16 Martin D Madaus Director 36,908 0 36,908 0.8% 06 Jan, 2025
17 Dawn Mattoon Sr. Vp, Diagnostics 36,876 0 36,876 0.8% 05 Apr, 2022
18 Vandana Sriram Chief Financial Officer 31,283 0 31,283 0.7% 23 Jun, 2026
19 Scott Mendel Director 24,056 0 24,056 0.5% 09 Jul, 2026
20 Mark T. Roskey Svp, Strategic Partnerships 22,325 0 22,325 0.5% 05 Apr, 2022
21 Brian J Blaser Director 19,049 0 19,049 0.4% 04 Jan, 2024
22 Jeffrey Thomas Elliott Director 15,345 0 15,345 0.3% 20 Aug, 2026
23 Goldman Myla Lai Director 15,041 0 15,041 0.3% 09 Jul, 2026
24 Laurie J Olson Director 13,738 0 13,738 0.3% 14 May, 2024
25 Benjamin Meadows Chief Commercial Officer 3,500 0 3,500 0.1% 12 Jun, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

2,828 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
31 Aug, 2026 Michael Francis Miller Chief Technology Officer Acquired M 159 — — 37,409 Direct
31 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed F 48 $2.67 $128 37,361 Direct
31 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed M 159 $0.00 $0 0 Direct
19 Aug, 2026 Jeffrey Thomas Elliott Director Acquired M 3,955 — — 15,345 Direct
19 Aug, 2026 Jeffrey Thomas Elliott Director Disposed M 3,955 $0.00 $0 4,075 Direct
17 Aug, 2026 William P Donnelly Director Acquired M 2,802 — — 162,401 Direct
17 Aug, 2026 William P Donnelly Director Disposed M 2,802 $0.00 $0 0 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Acquired M 81 — — 36,240 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed F 25 $2.59 $65 36,215 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Acquired M 136 — — 36,351 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed F 41 $2.59 $106 36,310 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Acquired M 135 — — 36,445 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed F 41 $2.59 $106 36,404 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Acquired M 372 — — 36,776 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed F 111 $2.59 $287 36,665 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Acquired M 834 — — 37,499 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed F 249 $2.59 $645 37,250 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed M 81 $0.00 $0 517 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed M 136 $0.00 $0 981 Direct
15 Aug, 2026 Michael Francis Miller Chief Technology Officer Disposed M 135 $0.00 $0 2,441 Direct