Quanterix Corp (QTRX) Insider Ownership

Historic Insider Ownership Trends

As of April 22, 2026, the three largest insider holders of QTRX are David R Walt (Director, 1.87Mn shares), David R Walt (Director, 1.87Mn shares), E Kevin Hrusovsky (Executive Chairman, 910.25K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
David R Walt - 1,872,890 0 06 Jan, 2026
David R Walt - 1,872,890 0 06 Jan, 2026
E Kevin Hrusovsky Executive Chairman 910,249 0 06 Jul, 2022
Masoud Toloue President Ceo 507,310 0 20 Jan, 2026
Masoud Toloue President Ceo 507,310 0 20 Jan, 2026
Paul M Meister - 313,253 0 07 Jan, 2026
Martin D Madaus - 0 254,633 10 Aug, 2022
William P Donnelly Executive Chair 154,127 0 03 Apr, 2026
Keith Crandell - 131,236 0 04 Apr, 2023
Michael A Doyle Cfo And Treasurer 88,332 0 02 Oct, 2023
Alan Bruce Sachs - 70,099 0 06 Jan, 2026
Alan Bruce Sachs - 70,099 0 06 Jan, 2026
Malcolm Garret Hampton - 70,099 0 06 Jan, 2026
Sarah E. Hlavinka - 60,070 0 03 Jul, 2025
Karen Flynn - 57,212 0 06 Jan, 2026
Goldman Myla Lai - 54,804 0 06 Jan, 2026
David C. Duffy Svp Rd And Cto 54,730 0 28 Mar, 2022
Ivana Magovcevic-Liebisch - 43,607 0 06 Jan, 2026
Jeffrey Thomas Elliott - 42,792 0 06 Jan, 2026
John J Fry General Counsel Secretary 37,671 0 03 Aug, 2022
Martin D Madaus - 36,908 0 06 Jan, 2025
Dawn Mattoon Sr. Vp, Diagnostics 36,876 0 05 Apr, 2022
Michael Francis Miller Chief Operating Officer 31,431 0 31 Mar, 2026
Vandana Sriram Chief Financial Officer 27,428 0 16 Mar, 2026
Vandana Sriram Chief Financial Officer 27,428 0 16 Mar, 2026
Mark T. Roskey Svp, Strategic Partnerships 22,325 0 05 Apr, 2022
Mark T. Roskey Svp, Strategic Partnerships 22,325 0 05 Apr, 2022
Brian J Blaser - 19,049 0 04 Jan, 2024
Laurie J Olson - 13,738 0 14 May, 2024
Scott Mendel - 12,527 0 03 Apr, 2026

* 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.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
01 Apr, 2026 William P Donnelly Common Stock A 6,178 $0.00 154,127 D A
01 Apr, 2026 Scott Mendel Common Stock A 4,310 $0.00 12,527 D A
31 Mar, 2026 Michael Francis Miller Common Stock A 99 - 31,370 D M
31 Mar, 2026 Michael Francis Miller Common Stock D 30 $3.52 31,340 D F
31 Mar, 2026 Michael Francis Miller Common Stock A 130 - 31,470 D M
31 Mar, 2026 Michael Francis Miller Common Stock D 39 $3.52 31,431 D F
31 Mar, 2026 Michael Francis Miller Restricted Stock Unit D 99 $0.00 0 D M
31 Mar, 2026 Michael Francis Miller Restricted Stock Unit D 130 $0.00 679 D M
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