Delisting risk
Quantum-Si (QSI)
Builds benchtop systems, kits, and software for research-use protein sequencing.
$0.7676
Pre-market+0.00 (+0.04%)
At close$0.7673(+1.32%)
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Breakdown13F · 13D/G · Form 4
| Institutions148 holders · as of Jun 30, 2026 | 24.18% | 52.94M shares | |
| Insiders7 holders · as of Aug 28, 2026 | 13.81% | 30.22M shares | |
| Otherremainder | 62.01% | 135.72M shares |
218.88M company shares as of Sep 3, 2026 · institutions as of Jun 30, 2026 · holders as of their latest filing
Two share counts disagree (218.88M in the company's Sep 3, 2026 report, 197.82M elsewhere); stakes use the report.
This company has 2 share classes; every stake here is a share of the whole company.
Institutions13F, as of Jun 30, 2026
148 holders · 52.94M shares · 28 new positions · 61 increased · 59 reduced · 43 closed
| Holder | Shares | % of company | Chg q/q | Filed |
|---|---|---|---|---|
| Vanguard Capital Management LLC | 7.58M | 3.46% | +556.3K | Aug 13, 2026 |
| Ark Investment Management LLC | 7.17M | 3.27% | +288.8K | Aug 14, 2026 |
| BlackRock, Inc. | 5.23M | 2.39% | −8.19M | Aug 7, 2026 |
| Nikko Asset Management Americas, Inc. | 3.89M | 1.78% | −506.4K | Aug 13, 2026 |
| Sumitomo Mitsui Trust Group, Inc. | 3.89M | 1.78% | −506.4K | Jul 30, 2026 |
| Millennium Management LLC | 3.13M | 1.43% | +3.13M | Aug 14, 2026 |
| UBS Group AG | 2.56M | 1.17% | +859.4K | Aug 13, 2026 |
| AQR Capital Management LLC | 2.35M | 1.07% | −43.5K | Aug 14, 2026 |
Ownership statements13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Rothberg Jonathan M.incl. 4C Holdings I, LLC, 23rd Century Capital LLC +1 more | 100.00% | 19.94M | 13D | Aug 28, 2026 ↗ |
Insider tradesForm 4
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Jun 23, 2026 | Jeffrey Alan Hawkinsdirector, officer: President & CEO | Sale | 11,311 | $0.8990 | 3,669,802 |
| Jun 22, 2026 | Jeffrey Alan Hawkinsdirector, officer: President & CEO | Sale | 11,310 | $0.9574 | 3,681,113 |
| Jun 23, 2026 | John S. Vieceliofficer: Chief Product Officer | Sale | 15,112 | $0.8990 | 1,140,434 |
| Jun 22, 2026 | John S. Vieceliofficer: Chief Product Officer | Sale | 15,111 | $0.9574 | 1,155,546 |
| Jun 23, 2026 | Jeffry R. Keyesofficer: Chief Financial Officer | Sale | 4,117 | $0.8990 | 1,724,349 |
| Jun 22, 2026 | Jeffry R. Keyesofficer: Chief Financial Officer | Sale | 4,116 | $0.9574 | 1,728,466 |
| Jun 23, 2026 | Christian LaPointeofficer: GC & Corp. Secretary | Sale | 7,794 | $0.8990 | 1,182,429 |
| Jun 22, 2026 | Christian LaPointeofficer: GC & Corp. Secretary | Sale | 7,794 | $0.9574 | 1,190,223 |
| Apr 21, 2026 | Jeffrey Alan Hawkinsdirector, officer: President & CEO | Sale | 83,712 | $0.9950 | 3,692,423 |
| Apr 20, 2026 | Jeffrey Alan Hawkinsdirector, officer: President & CEO | Sale | 83,712 | $1.01 | 3,776,135 |
CongressHouse and Senate disclosures
Not reported.