Quanterix
QTRX
134 hedge funds and large institutions have $223M invested in Quanterix in 2025 Q4 according to their latest regulatory filings, with 21 funds opening new positions, 42 increasing their positions, 43 reducing their positions, and 13 closing their positions.
1,119% more call options, than puts
Call options by funds: $256K | Put options by funds: $21K
100% more funds holding in top 10
Funds holding in top 10: 1 → 2 (+1)
62% more first-time investments, than exits
New positions opened: 21 | Existing positions closed: 13
15% more capital invested
Capital invested by funds: $194M → $223M (+$29.6M)
4% more funds holding
Funds holding: 129 → 134 (+5)
2% less repeat investments, than reductions
Existing positions increased: 42 | Existing positions reduced: 43
1.6% less ownership
Funds ownership: 76.77% → 75.17% (-1.6%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BWLSA
Blue Water Life Science Advisors
Larkspur,
California
|
+$7.05M |
| 2 |
Ameriprise
Minneapolis,
Minnesota
|
+$4.67M |
| 3 |
William Blair Investment Management
Chicago,
Illinois
|
+$4.54M |
| 4 |
First Eagle Investment Management
New York
|
+$3.3M |
| 5 |
PCM
Portolan Capital Management
Boston,
Massachusetts
|
+$1.65M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
-$5.01M |
| 2 |
EIP
Easterly Investment Partners
Beverly,
Massachusetts
|
-$3.95M |
| 3 |
Aberdeen Group
Edinburgh,
United Kingdom
|
-$2.86M |
| 4 |
Marshall Wace
London,
United Kingdom
|
-$2.82M |
| 5 |
Dimensional Fund Advisors
Austin,
Texas
|
-$1.97M |
QTRX Hedge Fund Activity: Q4 2025 in Review
134 of the 8,267 institutional investors tracked by Wall St. Rank reported a position in Quanterix (QTRX) for Q4 2025, worth a combined $223M — up 15% from $194M a quarter earlier.
Buyers outnumbered sellers: 21 funds opened new QTRX positions and 13 closed out — a net gain of 8 holders — while 42 added to existing stakes and 43 trimmed.
The largest buyer was Blue Water Life Science Advisors, adding an estimated $7.05M. The largest seller was Millennium Management, cutting an estimated $5.01M.
- 134 institutional investors held Quanterix (QTRX) as of Q4 2025, up from 129 in Q3 2025.
- Funds reported $223M of Quanterix stock for Q4 2025, up 15% quarter-over-quarter.
- 21 funds opened new Quanterix positions in Q4 2025 and 13 closed out, a net change of +8 holders.
- The largest Quanterix buyer in Q4 2025 was Blue Water Life Science Advisors, an estimated $7.05M added.
- The largest Quanterix seller in Q4 2025 was Millennium Management, an estimated $5.01M sold.
Based on aggregated 13F filings for Q4 2025.