Ticker · CUSIP 74765K105
Holders (tracked)
8
Combined shares
12,273,815
Combined value
$13.40M
Last close
$1.04
Quarter
2025Q4
Tracked holders · last 8 quarters
Flat over the last 8 quarters.
Price is -4.7% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
12 events
- Ken Griffin (Citadel Advisors) added2026-02-17+2,269,050 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−2,478,168 shares · 2025Q413F
- T. Rowe Price added2026-02-17+4,452 shares · 2025Q413F
- AQR Capital Management added2026-02-17+2,865 shares · 2025Q413F
- Two Sigma Investments added2026-02-17+868,329 shares · 2025Q413F
- Cathie Wood (ARK Invest) trimmed2026-02-11−602,471 shares · 2025Q413F
- AQR Capital Management trimmed2025-11-14−37,879 shares · 2025Q313F
- Izzy Englander (Millennium Mgmt) trimmed2025-11-14−1,109,300 shares · 2025Q313F
- Two Sigma Investments trimmed2025-11-14−48,590 shares · 2025Q313F
- T. Rowe Price trimmed2025-11-14−28,472 shares · 2025Q313F
- Renaissance Technologies exited2025-11-13−89,200 shares · 2025Q313F
- Cathie Wood (ARK Invest) trimmed2025-11-12−336,694 shares · 2025Q313F
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of QSI…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| Ken Griffin (Citadel Advisors) | 2021Q2 | $1.16 | -10.2% | $578K |
| Ken Griffin (Citadel Advisors) | 2021Q2 | $1.16 | -10.2% | $578K |
| Ken Griffin (Citadel Advisors) | 2021Q2 | $1.16 | -10.2% | $578K |
| Two Sigma Investments | 2022Q4 | $1.21 | -13.8% | $1.4M |
| Izzy Englander (Millennium Mgmt) | 2021Q2 | $1.21 | -14.2% | $199K |
| AQR Capital Management | 2022Q1 | $2.55 | -59.3% | $90K |
| T. Rowe Price | 2021Q2 | $3.47 | -70.0% | $100K |
| Cathie Wood (ARK Invest) | 2021Q2 | $7.41 | -86.0% | $7.3M |
Who moved on this name in 2025Q4
13F transactions reported for the latest quarter, grouped by direction.
New positions0
—
Added to4
- Ken Griffin (Citadel Advisors)+2,269,050$2.5M
- Two Sigma Investments+868,329$955K
- AQR Capital Management+2,865$3K
- T. Rowe Price+4,452$5
Trimmed2
- Izzy Englander (Millennium Mgmt)−2,478,168$2.7M
- Cathie Wood (ARK Invest)−602,471$663K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 10 | $106.6M |
| 2022Q2 | 9 | $87.1M |
| 2022Q3 | 8 | $69K |
| 2022Q4 | 11 | $42.3M |
| 2023Q1 | 12 | $39.2M |
| 2023Q2 | 10 | $40.3M |
| 2023Q3 | 6 | $36.2M |
| 2023Q4 | 7 | $46.8M |
| 2024Q1 | 8 | $40.4M |
| 2024Q2 | 9 | $21.2M |
| 2024Q3 | 9 | $10.8M |
| 2024Q4 | 7 | $28.9M |
| 2025Q1 | 9 | $18.5M |
| 2025Q2 | 9 | $27.1M |
| 2025Q3 | 8 | $17.0M |
| 2025Q4 | 8 | $13.4M |
Who owns QSI
8 super-investors · 2025Q4
Tracked stake
12.27M
shares
Combined value
$13M
% of shares outstanding
—
shares-out unknown
Quarter action mix
Added6Trim2
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Cathie Wood ARK Invest | 7.02M | $8M |
| 2 | Ken Griffin Citadel Advisors | 2.68M | $3M |
| 3 | Two Sigma Investments | 1.38M | $2M |
| 4 | Ken Griffin Citadel Advisors | 556.0K | $612K |
| 5 | Ken Griffin Citadel Advisors | 261.0K | $287K |
| 6 | Izzy Englander Millennium Mgmt | 191.8K | $211K |
| 7 | AQR Capital Management | 86.7K | $95K |
| 8 | T. Rowe Price | 96.5K | $107 |
Recent moves
20 transactions
- +2,865 · 2025Q4
- −2,478,168 · 2025Q4
- +2,269,050 · 2025Q4
- +4,452 · 2025Q4
- +868,329 · 2025Q4
- −602,471 · 2025Q4
- TRIMT. Rowe Price−28,472 · 2025Q3
- −37,879 · 2025Q3
- −1,109,300 · 2025Q3
- −48,590 · 2025Q3
- −89,200 · 2025Q3
- −336,694 · 2025Q3
- +12,332 · 2025Q2
- −155,026 · 2025Q2
- −252,533 · 2025Q2
- +25,661 · 2025Q2
- −782,556 · 2025Q2
- −752,765 · 2025Q2
- +3,934,285 · 2025Q1
- +664,292 · 2025Q1
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