Quanterix Corp
Total Trades
53
Buys
12
Sells
38
Largest Trade
N/A
Insiders
14
Institutional Funds
97
Inst. Value
$1M+
Activist Filings
36
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Sriram Vandana | CFO | BUY | $15K–$50K | 4K | $4.79 | Sep 17, 2025 |
| WALT DAVID R | Director | BUY | $500K+ | 160K | $6.16 | Jun 13, 2025 |
| Toloue Masoud | President & CEO | BUY | $100K–$500K | 46K | $5.42 | Jun 10, 2025 |
| WALT DAVID R | Director | BUY | $1M+ | 210K | $5.40 | Jun 9, 2025 |
| DONNELLY WILLIAM P | Director | BUY | $500K+ | 93K | $5.44 | Jun 9, 2025 |
| OLSON LAURIE J | Director | EXERCISE | $1K–$15K | 1K | $12.86 | Apr 2, 2024 |
| OLSON LAURIE J | Director | SELL | $15K–$50K | 1K | $23.50 | Apr 2, 2024 |
| OLSON LAURIE J | Director | SELL | $15K–$50K | 2K | $24.35 | Feb 15, 2024 |
| OLSON LAURIE J | Director | EXERCISE | $1K–$15K | 1K | $12.86 | Jan 4, 2024 |
| OLSON LAURIE J | Director | SELL | $15K–$50K | 1K | $26.91 | Jan 4, 2024 |
| OLSON LAURIE J | Director | GRANT | N/A | 3K | — | Jan 4, 2024 |
| OLSON LAURIE J | Director | SELL | $15K–$50K | 2K | $21.89 | Nov 14, 2023 |
| DONNELLY WILLIAM P | Director | BUY | $500K+ | 20K | $24.85 | Sep 11, 2023 |
| DOYLE MICHAEL A | CFO and Treasurer | BUY | $100K–$500K | 30K | $10.30 | Aug 16, 2022 |
| Toloue Masoud | President & CEO | BUY | $1M+ | 105K | $10.43 | Aug 16, 2022 |
| Hlavinka Sarah E. | Director | BUY | $100K–$500K | 10K | $9.89 | Aug 11, 2022 |
| WALT DAVID R | Director | BUY | $1M+ | 150K | $8.62 | Aug 10, 2022 |
| MEISTER PAUL M | Director | BUY | $1M+ | 234K | $8.53 | Aug 10, 2022 |
| Madaus Martin D | Director | BUY | $500K+ | 90K | $8.43 | Aug 10, 2022 |
| Toloue Masoud | President & CEO | SELL | $1K–$15K | 446 | $15.61 | Aug 3, 2022 |
| DOYLE MICHAEL A | CFO and Treasurer | SELL | $1K–$15K | 471 | $17.96 | Aug 3, 2022 |
| Fry John J | General Counsel & … | SELL | $1K–$15K | 401 | $15.61 | Aug 3, 2022 |
| HRUSOVSKY E KEVIN | Executive Chairman | SELL | $15K–$50K | 960 | $16.57 | Jul 6, 2022 |
| Toloue Masoud | President & CEO | SELL | $1K–$15K | 432 | $16.57 | Jul 6, 2022 |
| Fry John J | General Counsel & … | SELL | $1K–$15K | 387 | $16.57 | Jul 6, 2022 |
| Toloue Masoud | President & CEO | SELL | $50K–$100K | 6K | $15.27 | Jun 14, 2022 |
| HRUSOVSKY E KEVIN | Executive Chairman | SELL | $1K–$15K | 712 | $17.47 | Jun 3, 2022 |
| Fry John J | General Counsel & … | SELL | $1K–$15K | 378 | $17.47 | Jun 3, 2022 |
| HRUSOVSKY E KEVIN | Executive Chairman | SELL | $1K–$15K | 649 | $22.36 | May 3, 2022 |
| Fry John J | General Counsel & … | SELL | $1K–$15K | 429 | $22.36 | May 3, 2022 |
| HRUSOVSKY E KEVIN | Chairman and CEO | SELL | $15K–$50K | 868 | $29.79 | Apr 5, 2022 |
| Roskey Mark T. | SVP | SELL | $1K–$15K | 171 | $29.79 | Apr 5, 2022 |
| Fry John J | General Counsel & … | SELL | $15K–$50K | 524 | $29.79 | Apr 5, 2022 |
| Mattoon Dawn | Sr. VP, Diagnostics | SELL | $1K–$15K | 261 | $29.79 | Apr 5, 2022 |
| Duffy David C. | SVP R&D and CTO | SELL | $50K–$100K | 3K | $30.00 | Mar 28, 2022 |
| Roskey Mark T. | SVP | SELL | $1K–$15K | 166 | $31.46 | Mar 3, 2022 |
| HRUSOVSKY E KEVIN | Chairman and CEO | SELL | $15K–$50K | 589 | $31.46 | Mar 3, 2022 |
| Fry John J | General Counsel & … | SELL | $1K–$15K | 371 | $31.46 | Mar 3, 2022 |
| Mattoon Dawn | Sr. VP, Diagnostics | SELL | $1K–$15K | 267 | $31.46 | Mar 3, 2022 |
| Roskey Mark T. | SVP | SELL | $1K–$15K | 292 | $34.97 | Feb 9, 2022 |
| Fry John J | General Counsel & … | SELL | $15K–$50K | 481 | $34.97 | Feb 9, 2022 |
| Mattoon Dawn | Sr. VP, Diagnostics | SELL | $1K–$15K | 318 | $34.97 | Feb 9, 2022 |
| HRUSOVSKY E KEVIN | Chairman and CEO | SELL | $15K–$50K | 1K | $34.97 | Feb 9, 2022 |
| Duffy David C. | SVP R&D and CTO | SELL | $100K–$500K | 3K | $30.91 | Feb 4, 2022 |
| Roskey Mark T. | SVP | SELL | $1K–$15K | 166 | $31.46 | Feb 4, 2022 |
| Mattoon Dawn | Sr. VP, Diagnostics | SELL | $1K–$15K | 267 | $31.46 | Feb 4, 2022 |
| HRUSOVSKY E KEVIN | Chairman and CEO | SELL | $15K–$50K | 589 | $31.46 | Feb 4, 2022 |
| Fry John J | General Counsel & … | SELL | $1K–$15K | 371 | $31.46 | Feb 4, 2022 |
| Duffy David C. | SVP R&D and CTO | SELL | $50K–$100K | 3K | $30.00 | Jan 31, 2022 |
| Fry John J | General Counsel & … | SELL | $1K–$15K | 352 | $41.91 | Jan 5, 2022 |
Institutional Ownership
13F filings as of Dec 31, 2025 · 97 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| Portolan Capital Management, LLC | 4.5M | $1M+ | SH |
| VANGUARD GROUP INC | 2.4M | $1M+ | SH |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | 2.0M | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 927K | $1M+ | SH |
| STATE STREET CORP | 893K | $1M+ | SH |
| Trium Capital LLP | 817K | $1M+ | SH |
| Williams Jones Wealth Management, LLC. | 639K | $1M+ | SH |
| Empire Financial Management Company, LLC | 618K | $1M+ | SH |
| EASTERLY INVESTMENT PARTNERS LLC | 617K | $1M+ | SH |
| Tikvah Management LLC | 572K | $1M+ | SH |
| First Eagle Investment Management, LLC | 531K | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 363K | $1M+ | SH |
| DIMENSIONAL FUND ADVISORS LP | 346K | $1M+ | SH |
| ENVESTNET ASSET MANAGEMENT INC | 252K | $1M+ | SH |
| IRONWOOD INVESTMENT MANAGEMENT LLC | 172K | $1M+ | SH |
| TUDOR INVESTMENT CORP ET AL | 170K | $1M+ | SH |
| BNP PARIBAS FINANCIAL MARKETS | 168K | $1M+ | SH |
| GSA CAPITAL PARTNERS LLP | 122K | $500K+ | SH |
| SCS Capital Management LLC | 120K | $500K+ | SH |
| CITIGROUP INC | 111K | $500K+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares
Telegraph Hill Partners III, L.P.
SC 13G · Nov 19, 2025
5.4%
2.5M shares
SC 13G/A · Nov 14, 2025
9.1%
4.2M shares
Portolan Capital Management, LLC
SC 13G/A · Aug 13, 2025
9.4%
3.6M shares
SC 13G/A · Jul 17, 2025
7.3%
2.8M shares
SC 13D/A · Jul 15, 2025
4.5%
2.1M shares
SC 13G/A · May 15, 2025
9.6%
3.7M shares
Portolan Capital Management, LLC
SC 13G/A · May 15, 2025
7.6%
3.0M shares
SC 13G/A · May 14, 2025
0.1%
37K shares
SC 13G/A · May 7, 2025
10.7%
4.2M shares
SC 13D/A · Apr 30, 2025
0.0%
0 shares
SC 13G/A · Apr 30, 2025
6.5%
2.5M shares
Integrated Core Strategies (US) LLC
SC 13G/A · Apr 23, 2025
0.0%
0 shares
SC 13D/A · Mar 3, 2025
6.9%
2.6M shares
SC 13G · Feb 14, 2025
8.3%
3.2M shares
SC 13D · Feb 13, 2025
5.9%
2.3M shares
SC 13G/A · Feb 5, 2025
6.3%
2.4M shares
SC 13D · Jan 17, 2025
6.2%
3.0M shares
SC 13G · Nov 15, 2024
8.5%
3.3M shares
Portolan Capital Management, LLC
SC 13G/A · Nov 13, 2024
6.6%
2.5M shares
Portolan Capital Management, LLC
SC 13G · Jun 27, 2024
5.0%
1.9M shares
SC 13G/A · Feb 14, 2024
2.1%
811K shares
SC 13G/A · Feb 14, 2024
5.2%
1.9M shares
Camber Capital Management LP 42-1693587
SC 13G/A · Feb 14, 2024
0.0%
0 shares
The Vanguard Group - 23-1945930
SC 13G · Feb 13, 2024
5.4%
2.1M shares
Integrated Core Strategies (US) LLC
SC 13G/A · Jan 29, 2024
5.5%
2.1M shares
SC 13G/A · Jan 25, 2024
8.4%
3.2M shares
SC 13G · Sep 29, 2023
5.3%
2.0M shares
SC 13G/A · Feb 22, 2023
5.6%
2.1M shares
SC 13G/A · Feb 14, 2023
0.0%
0 shares
Camber Capital Management LP 42-1693587
SC 13G/A · Feb 14, 2023
9.2%
3.4M shares
Gilder, Gagnon, Howe & Co. LLC
SC 13G/A · Feb 14, 2023
2.5%
943K shares
SC 13G/A · Jan 31, 2023
7.4%
2.8M shares
SC 13G/A · Jan 25, 2023
5.6%
2.1M shares
Camber Capital Management LP 42-1693587
SC 13G · Aug 19, 2022
8.1%
3.0M shares
Gilder, Gagnon, Howe & Co. LLC
SC 13G/A · Feb 14, 2022
7.7%
2.8M shares
SC 13G · Feb 11, 2022
8.6%
3.2M shares