3 institutions reported holding $4,658 of QUANTUM SI CL A ORD (QSI) in SEC 13F filings for 2026-06-30. Largest institutional holders: FNY Investment Advisers, LLC ($3,000), GAMMA Investing LLC ($1,215), Bangor Savings Bank ($443). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | FNY Investment Advisers, LLC | $3,000 | 4,000 | Hold |
| 2 | GAMMA Investing LLC | $1,215 | 1,373 | Trimmed |
| 3 | Bangor Savings Bank | $443 | 500 | Added |
Source: SEC Form 13F filings · as of 2026-06-30