QTRX · Insider trading · 13F holders · Congress trades
Quanterix Corp (QTRX)
Who is buying and selling QTRX: company insiders on SEC Form 4, hedge funds and superinvestors on Form 13F, and members of Congress under the STOCK Act. Every figure links to the filing or page it comes from.
- 13F filers holding
- 3
- Insider buys, 90 days
- $286K
- Insider sales, 90 days
- $0
- Congress trades, 12 months
- 0
QTRX at a glance
- Between Aug 1, 2026 and Oct 29, 2026, 1 QTRX insider filed 1 open-market purchase worth $286K on SEC Form 4.
- 3 13F filers hold QTRX among their 50 largest positions, worth $24.0M combined. The biggest bets by portfolio weight are Lionhunter Capital Management, LLC (2.9%) and Tikvah Management LLC (0.8%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
- No member of Congress has disclosed a trade in QTRX.
- QTRX last closed at $3.15 on Oct 29, 2026.
QTRX insider trading
Between Aug 1, 2026 and Oct 29, 2026, 1 QTRX insider filed 1 open-market purchase worth $286K on SEC Form 4.
| Filed | Insider | Role | Trade | Shares | Price | Value | Form 4 |
|---|---|---|---|---|---|---|---|
| Aug 14, 2026 | Donnelly William P | Director | Buy | 99,400 | $2.88 | $286K | SEC |
Who owns QTRX? Hedge funds and superinvestors
3 13F filers hold QTRX among their 50 largest positions, worth $24.0M combined. The biggest bets by portfolio weight are Lionhunter Capital Management, LLC (2.9%) and Tikvah Management LLC (0.8%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
| Manager | % of portfolio | Value | Shares | Last quarter | 13F |
|---|---|---|---|---|---|
| Blue Water Life Science Advisors, LPHedge fund | 9.5% | $15.0M | 3,474,202 | +62.2% shares | Q2 2026 |
| Lionhunter Capital Management, LLCWealth manager | 2.9% | $6.5M | 1,500,427 | — | Q2 2026 |
| Tikvah Management LLCInvestment manager | 0.8% | $2.5M | 571,555 | -0.0% shares | Q2 2026 |
Each manager counts with its latest 13F (Q2 2026: 3). Screen QTRX in the grand portfolio →
QTRX stock trades by members of Congress
No member of Congress has disclosed a trade in QTRX.
QTRX questions and answers
Are insiders buying QTRX stock?
Between Aug 1, 2026 and Oct 29, 2026, 1 QTRX insider filed 1 open-market purchase worth $286K on SEC Form 4.
Which hedge funds own QTRX?
3 13F filers hold QTRX among their 50 largest positions, worth $24.0M combined. The biggest bets by portfolio weight are Lionhunter Capital Management, LLC (2.9%) and Tikvah Management LLC (0.8%). In their latest 13Fs, 0 managers opened a new position and 1 added to one.
Has Congress traded QTRX?
No member of Congress has disclosed a trade in QTRX.
Who is the largest holder of QTRX?
Among 13F filers, Blue Water Life Science Advisors, LP reports the largest QTRX position, $15.0M (3,474,202 shares) in its Q2 2026 13F. The biggest bet by portfolio weight is Lionhunter Capital Management, LLC's: 2.9% of its portfolio.
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