Quanterix
QTRX
129 hedge funds and large institutions have $194M invested in Quanterix in 2025 Q3 according to their latest regulatory filings, with 20 funds opening new positions, 46 increasing their positions, 36 reducing their positions, and 26 closing their positions.
28% more repeat investments, than reductions
Existing positions increased: 46 | Existing positions reduced: 36
7.28% more ownership
Funds ownership: 69.49% → 76.77% (+7.3%)
6% less funds holding
Funds holding: 137 → 129 (-8)
16% less capital invested
Capital invested by funds: $231M → $194M (-$37.2M)
23% less first-time investments, than exits
New positions opened: 20 | Existing positions closed: 26
34% less call options, than puts
Call options by funds: $71K | Put options by funds: $107K
50% less funds holding in top 10
Funds holding in top 10: 2 → 1 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$6.37M |
| 2 |
PCM
Portolan Capital Management
Boston,
Massachusetts
|
+$3.33M |
| 3 |
EFMC
Empire Financial Management Company
New York
|
+$1.75M |
| 4 |
Envestnet Asset Management
Chicago,
Illinois
|
+$1.51M |
| 5 |
ICM
Invenomic Capital Management
Boston,
Massachusetts
|
+$1.32M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
KLP
Kent Lake PR
Anasco,
Puerto Rico
|
-$6.91M |
| 2 |
Balyasny Asset Management
Chicago,
Illinois
|
-$5.11M |
| 3 |
Baillie Gifford & Co
Edinburgh,
United Kingdom
|
-$4M |
| 4 |
PHP
Parkman Healthcare Partners
Stamford,
Connecticut
|
-$1.4M |
| 5 |
SCM
SCS Capital Management
Boston,
Massachusetts
|
-$1.25M |
| Name | Holding | Trade Value |
Shares Change |
Change in Stake |
|
|---|---|---|---|---|---|
|
CPA
151
Compass Planning Associates
Greenfield,
Massachusetts
| – | -$1.64K | -246 | Closed |
|
152
Northwestern Mutual Wealth Management
Milwaukee,
Wisconsin
| – | -$1.53K | -230 | Closed |
|
|
RIL
153
Rothschild Investment LLC
Chicago,
Illinois
| – | -$466 | -70 | Closed |
|
|
PS
154
Principal Securities
Des Moines,
Iowa
| – | -$399 | -60 | Closed |
|
QTRX Hedge Fund Activity: Q3 2025 in Review
129 of the 7,621 institutional investors tracked by Wall St. Rank reported a position in Quanterix (QTRX) for Q3 2025, worth a combined $194M — down 16% from $231M a quarter earlier.
Sellers outnumbered buyers: 26 funds closed out of QTRX and 20 opened new positions — a net loss of 6 holders — while 36 trimmed existing stakes and 46 added.
The largest buyer was Millennium Management, adding an estimated $6.37M. The largest seller was Kent Lake PR, cutting an estimated $6.91M.
- 129 institutional investors held Quanterix (QTRX) as of Q3 2025, down from 137 in Q2 2025.
- Funds reported $194M of Quanterix stock for Q3 2025, down 16% quarter-over-quarter.
- 20 funds opened new Quanterix positions in Q3 2025 and 26 closed out, a net change of -6 holders.
- The largest Quanterix buyer in Q3 2025 was Millennium Management, an estimated $6.37M added.
- The largest Quanterix seller in Q3 2025 was Kent Lake PR, an estimated $6.91M sold.
Based on aggregated 13F filings for Q3 2025.