Quantum-Si Incorporated
QSI
141 hedge funds and large institutions have $46.8M invested in Quantum-Si Incorporated in 2026 Q2 according to their latest regulatory filings, with 27 funds opening new positions, 34 increasing their positions, 58 reducing their positions, and 41 closing their positions.
133% more call options, than puts
Call options by funds: $1.56M | Put options by funds: $672K
4% less capital invested
Capital invested by funds: $49M → $46.8M (-$2.17M)
5.42% less ownership
Funds ownership: 32.13% → 26.72% (-5.4%)
10% less funds holding
Funds holding: 157 → 141 (-16)
34% less first-time investments, than exits
New positions opened: 27 | Existing positions closed: 41
41% less repeat investments, than reductions
Existing positions increased: 34 | Existing positions reduced: 58
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$2.98M |
| 2 |
Jane Street
New York
|
+$2.04M |
| 3 |
UBS Group
Zurich,
Switzerland
|
+$818K |
| 4 |
Vanguard Capital Management
Malvern,
Pennsylvania
|
+$530K |
| 5 |
Renaissance Technologies
New York
|
+$415K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
-$7.8M |
| 2 |
State Street
Boston,
Massachusetts
|
-$2.74M |
| 3 |
Geode Capital Management
Boston,
Massachusetts
|
-$1.52M |
| 4 |
Vanguard Portfolio Management
Malvern,
Pennsylvania
|
-$975K |
| 5 |
Northern Trust
Chicago,
Illinois
|
-$771K |
QSI Hedge Fund Activity: Q2 2026 in Review
141 of the 8,305 institutional investors tracked by Wall St. Rank reported a position in Quantum-Si Incorporated (QSI) for Q2 2026, worth a combined $46.8M — down 4.4% from $49M a quarter earlier.
Sellers outnumbered buyers: 41 funds closed out of QSI and 27 opened new positions — a net loss of 14 holders — while 58 trimmed existing stakes and 34 added.
The largest buyer was Millennium Management, opening a new position worth an estimated $2.98M. The largest seller was BlackRock, cutting an estimated $7.8M.
- 141 institutional investors held Quantum-Si Incorporated (QSI) as of Q2 2026, down from 157 in Q1 2026.
- Funds reported $46.8M of Quantum-Si Incorporated stock for Q2 2026, down 4.4% quarter-over-quarter.
- 27 funds opened new Quantum-Si Incorporated positions in Q2 2026 and 41 closed out, a net change of -14 holders.
- The largest Quantum-Si Incorporated buyer in Q2 2026 was Millennium Management, an estimated $2.98M added.
- The largest Quantum-Si Incorporated seller in Q2 2026 was BlackRock, an estimated $7.8M sold.
Based on aggregated 13F filings for Q2 2026.