Who owns Quantum-Si Inc?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of QSI from SEC Form 13F filings across 141 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 141 institutions disclosed 52.6M shares of Quantum-Si Inc worth $46.3M — about 24.1% of shares outstanding; the largest disclosed holder is VANGUARD CAPITAL MANAGEMENT LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
141
13F holders
$46.3M
value, 2026 filers
24.1%
of shares outstanding (52.6M sh)
29
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of QSI's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | VANGUARD CAPITAL MANAGEMENT LLC | 7.6M | $6.7M | 0.0% | 3.5% | +7.9% |
| 2 | ARK Investment Management LLC | 7.2M | $6.3M | 0.0% | 3.3% | +4.2% |
| 3 | BlackRock, Inc. | 5.2M | $4.6M | 0.0% | 2.4% | -61.0% |
| 4 | Sumitomo Mitsui Trust Group, Inc. | 3.9M | $3.4M | 0.0% | 1.8% | -11.5% |
| 5 | Amova Asset Management Americas, Inc. | 3.9M | $3.5M | 0.0% | 1.8% | -11.5% |
| 6 | MILLENNIUM MANAGEMENT LLCNEW | 3.1M | $2.8M | 0.0% | 1.4% | new |
| 7 | UBS Group AG | 2.6M | $2.3M | 0.0% | 1.2% | +50.5% |
| 8 | AQR CAPITAL MANAGEMENT LLC | 2.3M | $2.1M | 0.0% | 1.1% | -1.8% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 2.2M | $2.0M | 0.0% | 1% | -41.7% |
| 10 | JANE STREET GROUP, LLCNEW | 2.1M | $1.9M | 0.0% | 1% | new |
| 11 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1.1M | $988,324 | 0.0% | 0.5% | -23.7% |
| 12 | VANGUARD FIDUCIARY TRUST CO | 1.1M | $988,264 | 0.0% | 0.5% | -0.1% |
| 13 | STATE STREET CORP | 890,741 | $788,306 | 0.0% | 0.4% | -76.4% |
| 14 | Fosun International Ltd | 743,935 | $658,382 | 0.1% | 0.3% | 0.0% |
| 15 | RENAISSANCE TECHNOLOGIES LLC | 553,871 | $490,176 | 0.0% | 0.3% | +369.8% |
| 16 | VANGUARD PORTFOLIO MANAGEMENT LLC | 497,098 | $439,932 | 0.0% | 0.2% | -67.3% |
| 17 | GOLDMAN SACHS GROUP INC | 476,288 | $421,515 | 0.0% | 0.2% | +7.2% |
| 18 | NORTHERN TRUST CORP | 450,531 | $398,720 | 0.0% | 0.2% | -64.3% |
| 19 | Invesco Ltd. | 443,929 | $392,877 | 0.0% | 0.2% | +9.2% |
| 20 | BNP PARIBAS FINANCIAL MARKETS | 398,598 | $352,759 | 0.0% | 0.2% | +938.3% |
| 21 | IEQ CAPITAL, LLC | 350,816 | $310,472 | 0.0% | 0.2% | -1.9% |
| 22 | MORGAN STANLEY | 323,482 | $286,282 | 0.0% | 0.1% | +148.9% |
| 23 | IQ EQ FUND MANAGEMENT (IRELAND) Ltd | 321,134 | $284,204 | 0.0% | 0.1% | +9.9% |
| 24 | Knollwood Investment Advisory, LLC | 300,000 | $265,500 | 0.0% | 0.1% | 0.0% |
| 25 | IMC-Chicago, LLC | 285,758 | $252,896 | 0.0% | 0.1% | +29.4% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.