QUANTUM SI INC COM CL A is a security (CUSIP 74765K105) tracked across SEC portfolio filings. 154 institutional managers reported $52.7M on Form 13F as of 2026-06-30; 10 registered fund positions totaling $1.3M via N-PORT as of 2026-05-31.
Showing 15 of 154 managers by value.
| Manager | Location | Value | Shares |
|---|---|---|---|
| VANGUARD GROUP INC | Valley Forge, PA | $10.6M | 9,607,022 |
| BlackRock, Inc. | New York, NY | $10.4M | 13,414,949 |
| ARK Investment Management LLC | St. Petersburg, FL | $5.3M | 6,878,899 |
| Sumitomo Mitsui Trust Group, Inc. | CHIYODA-KU, TOKYO, M0 | $3.4M | 3,885,230 |
| Nikko Asset Management Americas, Inc. | New York, NY | $3.4M | 4,391,666 |
| GEODE CAPITAL MANAGEMENT, LLC | BOSTON, MA | $3.0M | 3,835,121 |
| STATE STREET CORP | BOSTON, MA | $2.9M | 3,770,689 |
| AQR CAPITAL MANAGEMENT LLC | Greenwich, CT | $1.9M | 2,392,179 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | BALA CYNWYD, PA | $1.5M | 1,464,568 |
| UBS Group AG | Zurich, V8 | $1.3M | 1,702,527 |
| NORTHERN TRUST CORP | CHICAGO, IL | $976K | 1,260,701 |
| Fosun International Ltd | Hong Kong, K3 | $576K | 743,935 |
| WOLVERINE TRADING, LLC | CHICAGO, IL | $379K | 33,034 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | SAN FRANCISCO, CA | $354K | 457,571 |
| Nuveen, LLC | CHARLOTTE, NC | $349K | 451,367 |
| Fund | Registrant | Value | % of fund |
|---|---|---|---|
| VANGUARD HEALTH CARE INDEX FUND | VANGUARD WORLD FUND | $642K | 0.34% |
| Fidelity Series Total Market Index Fund | Fidelity Concord Street Trust | $322K | 0.03% |
| Master Small Cap Index Series | Quantitative Master Series LLC | $189K | 0.39% |
| Small Cap Index Fund | Northern Funds | $71K | 0.52% |
| STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO | STATE STREET INSTITUTIONAL INVESTMENT TRUST | $38K | 0.15% |
| CVT Russell 2000 Small Cap Index Portfolio | Calvert Variable Trust, Inc. | $11K | 0.44% |
| VIP Extended Market Index Portfolio | Variable Insurance Products Fund II | $9K | 0.20% |
| State Street Total Return V.I.S. Fund | STATE STREET VARIABLE INSURANCE SERIES FUNDS INC | $3K | 0.03% |
| TIAA Separate Account VA-1 - Stock Index Account | TIAA Separate Account VA-1 | $2K | 0.02% |
| Blackstone Alternative Multi-Strategy Fund | Blackstone Alternative Investment Funds | $-4K | -0.01% |