Quantum-Si Incorporated
QSI
157 hedge funds and large institutions have $49M invested in Quantum-Si Incorporated in 2026 Q1 according to their latest regulatory filings, with 45 funds opening new positions, 39 increasing their positions, 37 reducing their positions, and 21 closing their positions.
114% more first-time investments, than exits
New positions opened: 45 | Existing positions closed: 21
74% more call options, than puts
Call options by funds: $1.04M | Put options by funds: $597K
16% more funds holding
Funds holding: 135 → 157 (+22)
5% more repeat investments, than reductions
Existing positions increased: 39 | Existing positions reduced: 37
2.39% less ownership
Funds ownership: 34.52% → 32.13% (-2.4%)
34% less capital invested
Capital invested by funds: $74.3M → $49M (-$25.3M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AQR Capital Management
Greenwich,
Connecticut
|
+$2.39M |
| 2 |
BlackRock
New York
|
+$374K |
| 3 |
IC
IEQ Capital
Foster City,
California
|
+$371K |
| 4 |
UBS Group
Zurich,
Switzerland
|
+$262K |
| 5 |
IMC Chicago
Chicago,
Illinois
|
+$229K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Citadel Advisors
Miami,
Florida
|
-$2.76M |
| 2 |
Two Sigma Investments
New York
|
-$1.38M |
| 3 |
Jane Street
New York
|
-$1.14M |
| 4 |
Northern Trust
Chicago,
Illinois
|
-$982K |
| 5 |
Susquehanna International Group
Bala Cynwyd,
Pennsylvania
|
-$894K |
QSI Hedge Fund Activity: Q1 2026 in Review
157 of the 8,186 institutional investors tracked by Wall St. Rank reported a position in Quantum-Si Incorporated (QSI) for Q1 2026, worth a combined $49M — down 34% from $74.3M a quarter earlier.
Buyers outnumbered sellers: 45 funds opened new QSI positions and 21 closed out — a net gain of 24 holders — while 39 added to existing stakes and 37 trimmed.
The largest buyer was AQR Capital Management, adding an estimated $2.39M. The largest seller was Citadel Advisors, cutting an estimated $2.76M.
- 157 institutional investors held Quantum-Si Incorporated (QSI) as of Q1 2026, up from 135 in Q4 2025.
- Funds reported $49M of Quantum-Si Incorporated stock for Q1 2026, down 34% quarter-over-quarter.
- 45 funds opened new Quantum-Si Incorporated positions in Q1 2026 and 21 closed out, a net change of +24 holders.
- The largest Quantum-Si Incorporated buyer in Q1 2026 was AQR Capital Management, an estimated $2.39M added.
- The largest Quantum-Si Incorporated seller in Q1 2026 was Citadel Advisors, an estimated $2.76M sold.
Based on aggregated 13F filings for Q1 2026.