QUANTUM SI INC (QSI): Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in QSI. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
7
13F filers
Aggregate Value
$5.4M
Across holders
Last Price
$0.77
2026-08-24
Sector
—
GICS
Quarterly fund activity6 increased1 reduced2 exited
Full exits: TWO SIGMA INVESTMENTS, LP, Walleye Capital LLC
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| MILLENNIUM MANAGEMENT LLC CIK 0001273087 | Hedge Fund | 3.13M | $2.8M | 51.0% | 0.0% | Added | — | Q2 2026 |
| AQR CAPITAL MANAGEMENT LLC CIK 0001167557 | Hedge Fund | 2.35M | $2.1M | 38.2% | 0.0% | Reduced | +$2.1M | Q2 2026 |
| RENAISSANCE TECHNOLOGIES LLC CIK 0001037389 | Hedge Fund | 554K | $490K | 9.0% | 0.0% | Added | +$386K | Q2 2026 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 44K | $39K | 0.7% | 0.0% | Added | $-61K | Q2 2026 |
| Point72 Asset Management, L.P. CIK 0001603466 | Hedge Fund | 39K | $35K | 0.6% | 0.0% | Added | — | Q2 2026 |
| BALYASNY ASSET MANAGEMENT LLC CIK 0001218710 | Hedge Fund | 14K | $12K | 0.2% | 0.0% | Added | — | Q2 2026 |
| Schonfeld Strategic Advisors LLC CIK 0001665241 | Hedge Fund | 10K | $9K | 0.2% | 0.0% | Added | — | Q2 2026 |
Added
Hedge Fund
$2.8M· 51.0% of total· 0.0% port· 3.13M sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$2.1M· 38.2% of total· 0.0% port· 2.35M sh· +$2.1M QoQ· Q2 2026
Added
Hedge Fund
$490K· 9.0% of total· 0.0% port· 554K sh· +$386K QoQ· Q2 2026
Added
Hedge Fund
$39K· 0.7% of total· 0.0% port· 44K sh· $-61K QoQ· Q2 2026
Added
Hedge Fund
$35K· 0.6% of total· 0.0% port· 39K sh· — QoQ· Q2 2026
Added
Hedge Fund
$12K· 0.2% of total· 0.0% port· 14K sh· — QoQ· Q2 2026
Added
Hedge Fund
$9K· 0.2% of total· 0.0% port· 10K sh· — QoQ· Q2 2026
Loading recent insider activity…