Quantum-Si Incorporated
QSI
135 hedge funds and large institutions have $126M invested in Quantum-Si Incorporated in 2025 Q2 according to their latest regulatory filings, with 15 funds opening new positions, 56 increasing their positions, 35 reducing their positions, and 16 closing their positions.
82% more capital invested
Capital invested by funds: $69.3M → $126M (+$56.9M)
60% more repeat investments, than reductions
Existing positions increased: 56 | Existing positions reduced: 35
3.96% more ownership
Funds ownership: 35.4% → 39.35% (+4%)
2% more call options, than puts
Call options by funds: $2.86M | Put options by funds: $2.8M
6% less first-time investments, than exits
New positions opened: 15 | Existing positions closed: 16
1% less funds holding
Funds holding: 137 → 135 (-2)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Vanguard Group
Malvern,
Pennsylvania
|
+$2.63M |
| 2 |
BlackRock
New York
|
+$2.08M |
| 3 |
Northern Trust
Chicago,
Illinois
|
+$1.87M |
| 4 |
N
Nuveen
Charlotte,
North Carolina
|
+$1.19M |
| 5 |
Geode Capital Management
Boston,
Massachusetts
|
+$670K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Renaissance Technologies
New York
|
-$1.16M |
| 2 |
AIM
ARK Investment Management
St. Petersburg,
Florida
|
-$1.11M |
| 3 |
XT
XTX Topco
George Town,
Cayman Islands
|
-$477K |
| 4 |
Two Sigma Investments
New York
|
-$374K |
| 5 |
NAMA
Nikko Asset Management Americas
New York
|
-$281K |
QSI Hedge Fund Activity: Q2 2025 in Review
135 of the 7,596 institutional investors tracked by Wall St. Rank reported a position in Quantum-Si Incorporated (QSI) for Q2 2025, worth a combined $126M — up 82% from $69.3M a quarter earlier.
Sellers outnumbered buyers: 16 funds closed out of QSI and 15 opened new positions — a net loss of 1 holder — while 35 trimmed existing stakes and 56 added.
The largest buyer was Vanguard Group, adding an estimated $2.63M. The largest seller was Renaissance Technologies, cutting an estimated $1.16M.
- 135 institutional investors held Quantum-Si Incorporated (QSI) as of Q2 2025, down from 137 in Q1 2025.
- Funds reported $126M of Quantum-Si Incorporated stock for Q2 2025, up 82% quarter-over-quarter.
- 15 funds opened new Quantum-Si Incorporated positions in Q2 2025 and 16 closed out, a net change of -1 holder.
- The largest Quantum-Si Incorporated buyer in Q2 2025 was Vanguard Group, an estimated $2.63M added.
- The largest Quantum-Si Incorporated seller in Q2 2025 was Renaissance Technologies, an estimated $1.16M sold.
Based on aggregated 13F filings for Q2 2025.