QuantumSi Inc (QSI)
Who owns QuantumSi Inc (QSI)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 90.6% of the shares are freely tradable; institutional investors hold 29.9%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 6.16 | 13,414,949 | +2.8 | 03/31/2026 |
| Vanguard Group Inc | 4.41 | 9,607,022 | +10.2 | 12/31/2025 |
| Vanguard Capital Management, LLC | 3.22 | 7,021,907 | +0.0 | 03/31/2026 |
| ARK Investment Management LLC | 3.16 | 6,878,899 | -2.0 | 03/31/2026 |
| Amova Asset Management Americas, Inc | 2.02 | 4,391,666 | -6.4 | 03/31/2026 |
| Sumitomo Mitsui Trust Group Inc | 2.02 | 4,391,666 | -6.4 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| ARK Genomic Revolution | 3.00 | 6,534,624 | -3.0 | 03/31/2026 |
| ARK Genomic Revolution ETF | 2.90 | 6,325,199 | -0.3 | 05/31/2026 |
| Vanguard Total Stock Mkt Idx Inv | 2.24 | 4,874,730 | +0.0 | 04/30/2026 |
| iShares Russell 2000 ETF | 1.87 | 4,070,469 | +0.9 | 05/29/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 21. Apr 2026 | Jeffry R Keyes | CFO | Sell | 37,381 | 0.99 | 37,007 |
| 20. Apr 2026 | Jeffrey Alan Hawkins | CEO | Sell | 83,712 | 1.01 | 84,549 |
| 20. Apr 2026 | Jeffry R Keyes | CFO | Sell | 37,382 | 1.01 | 37,756 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.