QSI Institutional Ownership
Who owns Quantum-Si Inc and what the big funds did with it last quarter, from every SEC 13F filing. 142 funds reported holding QSI at Jun 30, 2026.
- ▼64 buying vs 103 selling
- ▼Shares held by funds -16.8%
- ▼Funds holding -21
- ▲Superinvestors: 5 added, 0 cut
- ●Put/call not meaningful
What the filings show, not a forecast. Positions can be up to 45 days old and leave out short sales.
Funds holding and ownership
8 quartersQuarter over quarter
all 13F filers| Q2 2026 | This quarter | Q1 2026 | Change |
|---|---|---|---|
| Funds holding | 142 | 163 | −12.9% |
| In funds' top 10 | 0 | 0 | – |
| 13F shares | 52.9M | 63.6M | −16.8% |
| Held by funds | – | – | – |
| New positions | 28 | 42 | −33.3% |
| Increased | 36 | 38 | −5.3% |
| Reduced | 56 | 40 | +40.0% |
| Sold out | 47 | 23 | +104.3% |
| Calls (shares) | 0 | 133K | −100.0% |
| Puts (shares) | 0 | 0 | – |
| Put/call ratio | – | 0.00 | – |
Buyers vs sellers
adding or new vs cutting or sold outSuperinvestors in QSI
All superinvestors →
Who owns QSI
share of fund held shares- Index and passive funds35.2%
- Active managers and hedge funds43.3%
- Banks and brokers21.5%
- Pensions, insurers and other0.0%
The top 10 holders own 75.9% of all QSI shares that funds reported. Groups are our own grouping of filers by name.
Put/call ratio
funds' options, market makers left outAbove 1 means funds hold more puts than calls, a sign of hedging or bets on a fall. Options are valued at the underlying shares.
Filed so far for Q3 2026
34 funds changed their position- Sumitomo Mitsui Trust Group, Inc.Trimmed−172K sh
- Y-Intercept (Hong Kong) LtdTrimmed−61K sh
- Creative PlanningSold out−56K sh
- Wealth Enhancement Advisory Services, LLCSold out−63K sh
- Cambridge Investment Research Advisors, Inc.Trimmed−38K sh
🔒 Free account: see all 20.
Top holders
Q2 2026| # | Fund | Of company | Shares | Value | Change |
|---|---|---|---|---|---|
| 1 | Vanguard Capital Management LLC | – | 7.6M | $6.7M | +556K |
| 2 | ARK Investment Management LLC | – | 7.2M | $6.3M | +289K |
| 3 | BlackRock, Inc. | – | 5.2M | $4.6M | −8.2M |
| 4 | Amova Asset Management Americas, Inc. | – | 3.9M | $3.5M | −506K |
| 5 | Sumitomo Mitsui Trust Group, Inc. | – | 3.9M | $3.4M | −506K |
| 6 | Millennium Management LLC | – | 3.1M | $2.8M | +3.1M |
| 7 | UBS Group AG | – | 2.6M | $2.3M | +859K |
| 8 | AQR Capital Management LLC | – | 2.3M | $2.1M | −44K |
| 9 | Geode Capital Management, LLC | – | 2.2M | $2M | −1.6M |
| 10 | Jane Street Group, LLC | – | 2.1M | $1.9M | +2.1M |
- Millennium Management LLC+3.1M sh+$2.8M
- Jane Street Group, LLC+2.1M sh+$1.9M
- UBS Group AG+859K sh+$761K
- Vanguard Capital Management LLC+556K sh+$492K
- Renaissance Technologies LLC+436K sh+$386K
- Bnp Paribas Financial Markets+360K sh+$319K
- Aster Capital Management (DIFC) Ltd+345K sh+$305K
- ARK Investment Management LLC+289K sh+$256K
- BlackRock, Inc.−8.2M sh−$7.2M
- State Street Corp−2.9M sh−$2.5M
- Geode Capital Management, LLC−1.6M sh−$1.4M
- Vanguard Portfolio Management LLC−1M sh−$906K
- Northern Trust Corp−810K sh−$717K
- Amova Asset Management Americas, Inc.−506K sh−$451K
- Sumitomo Mitsui Trust Group, Inc.−506K sh−$448K
- Nuveen, LLC−421K sh−$373K
QSI institutional ownership FAQ
Who owns the most QSI stock?
In Q2 2026 13F filings the largest holder of QSI was Vanguard Capital Management LLC, followed by ARK Investment Management LLC and BlackRock, Inc.. Index fund managers are usually the biggest holders of large companies.
What percentage of QSI is owned by institutions?
142 funds reported holding 52.9M QSI shares at Jun 30, 2026.
Are hedge funds buying QSI?
In Q2 2026, 64 funds bought QSI (28 of them new positions) and 103 sold (47 sold out completely). Among well known investors, 5 added and 0 cut. Our fund sentiment for QSI is bearish.
What is QSI's institutional put/call ratio?
Too few option positions were reported for a meaningful ratio.
How current is this QSI ownership data?
13F filings show holdings at the end of each quarter and are due within 45 days, so positions can be up to six weeks old when they appear. We add each new filing within minutes, and the "filed so far" list shows funds that have already reported the next quarter.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Fund sentiment summarises what 13F filings show and is not a forecast. Holdings come from SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.