QTRX Institutional Ownership
Who owns Quanterix Corp and what the big funds did with it last quarter, from every SEC 13F filing. 133 funds reported holding QTRX at Jun 30, 2026, together owning 68.0% of the company.
- ▲80 buying vs 60 selling
- ▼Held by funds -9.0 pts
- ▲Funds holding +5
- ●Superinvestors: 2 added, 2 cut
- ●Put/call not meaningful
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 133 | 128 | +3.9% |
| In funds' top 10 | 2 | 2 | 0.0% |
| 13F shares | 32.2M | 36.4M | −11.7% |
| Held by funds | 68.0% | 77.1% | −9.0 pts |
| New positions | 36 | 15 | +140.0% |
| Increased | 44 | 51 | −13.7% |
| Reduced | 29 | 36 | −19.4% |
| Sold out | 31 | 23 | +34.8% |
| Calls (shares) | 260K | 0 | – |
| Puts (shares) | 0 | 0 | – |
| Put/call ratio | 0.00 | – | – |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in QTRX
All superinvestors →
Who owns QTRX
share of fund held shares- Index and passive funds29.6%
- Active managers and hedge funds60.1%
- Banks and brokers10.1%
- Pensions, insurers and other0.2%
The top 10 holders own 69.1% of all QTRX shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
22 funds changed their position- Creative PlanningSold out−19K sh
- Nisa Investment Advisors, LLCTrimmed−17K sh
- Anchyra Partners LLCNew+15K sh
- PharVision Advisers, LLCSold out−13K sh
- Kestra Private Wealth Services, LLCSold out−11K sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | First Eagle Investment Management, LLC | 11.64% | 5.5M | $23.8M | +4.2M |
| 2 | BlackRock, Inc. | 7.69% | 3.6M | $15.7M | +358K |
| 3 | Blue Water Life Science Advisors, LP | 7.35% | 3.5M | $15M | +1.3M |
| 4 | Portolan Capital Management, LLC | 4.02% | 1.9M | $8.2M | −1M |
| 5 | Vanguard Capital Management LLC | 3.81% | 1.8M | $7.8M | +16K |
| 6 | Lionhunter Capital Management, LLC | 3.17% | 1.5M | $6.5M | – |
| 7 | AQR Capital Management LLC | 2.84% | 1.3M | $5.8M | +1.3M |
| 8 | Geode Capital Management, LLC | 2.39% | 1.1M | $4.9M | +137K |
| 9 | Ameriprise Financial Inc | 2.09% | 987K | $4.3M | −2.6M |
| 10 | Marshall Wace, LLP | 2.06% | 974K | $4.2M | +351K |
- First Eagle Investment Management, LLC+4.2M sh+$18.2M
- Blue Water Life Science Advisors, LP+1.3M sh+$5.8M
- AQR Capital Management LLC+1.3M sh+$5.4M
- Jacobs Levy Equity Management, Inc+488K sh+$2.1M
- BlackRock, Inc.+358K sh+$1.5M
- Marshall Wace, LLP+351K sh+$1.5M
- Gsa Capital Partners LLP+315K sh+$1.4M
- Jane Street Group, LLC+263K sh+$1.1M
- Ameriprise Financial Inc−2.6M sh−$11M
- William Blair Investment Management, LLC−2.1M sh−$7.3M
- Invenomic Capital Management LP−1.9M sh−$6.8M
- Levin Capital Strategies, L.P.−1.5M sh−$5.2M
- Portolan Capital Management, LLC−1M sh−$4.5M
- Trium Capital LLP−994K sh−$3.5M
- Millennium Management LLC−649K sh−$2.8M
- Russell Investments Group, Ltd.−604K sh−$2.6M
QTRX institutional ownership FAQ
Who owns the most QTRX stock?
In Q2 2026 13F filings the largest holder of QTRX was First Eagle Investment Management, LLC, followed by BlackRock, Inc. and Blue Water Life Science Advisors, LP. Index fund managers are usually the biggest holders of large companies.
What percentage of QTRX is owned by institutions?
Funds that file 13F reports held 68.0% of QTRX's shares at Jun 30, 2026, compared with 77.1% a quarter earlier. That counts every manager with more than $100 million in US stocks.
Are hedge funds buying QTRX?
In Q2 2026, 80 funds bought QTRX (36 of them new positions) and 60 sold (31 sold out completely). Among well known investors, 2 added and 2 cut. Our fund sentiment for QTRX is neutral.
What is QTRX's institutional put/call ratio?
Funds reported $0 of QTRX puts against $1.1M of calls, a put/call ratio of 0.00. Market makers and bank trading desks are left out, since their options are mostly hedges.
How current is this QTRX ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.