QUANTUM SI INC (QSIAW)
Institutional ownership reported to the SEC as of Q1 2026, across 20 quarters.
7
Reporting holders
$59.5K
Reported value
15.9%
Held as options
+2
Holder change
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| DEERFIELD MANAGEMENT COMPANY, L.P. | $36.2K | 333,333 | 0.00% | 20q | HELD |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $10.2K | 85,121 | 0.00% | 3q | -10.5%-$1.2K |
| MILLENNIUM MANAGEMENT LLC | $9.5K | options only | 0.00% | 20q | OPTIONS |
| JANE STREET GROUP, LLC | $1.8K | 16,565 | 0.00% | 20q | -2.3% |
| WOLVERINE ASSET MANAGEMENT LLC | $1.6K | 14,522 | 0.00% | new | NEW |
| UBS Group AG | $227 | 2,080 | 0.00% | 3q | -2.7% |
| TORONTO DOMINION BANK | $11 | 100 | 0.00% | new | NEW |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q1 2026 | 7 | $59.5K | 451,721 | 2 | 0 | 3 | 15.9% |
| Q4 2025 | 5 | $107.2K | 447,563 | 0 | 1 | 2 | 16.3% |
| Q3 2025 | 5 | $156.3K | 497,347 | 2 | 1 | 0 | 15.0% |
| Q2 2025 | 3 | $284.4K | 349,852 | 0 | 0 | 1 | 19.9% |
| Q1 2025 | 3 | $174.8K | 349,999 | 0 | 0 | 1 | 19.9% |
| Q4 2024 | 5 | $634.0K | 420,128 | 1 | 1 | 0 | 17.2% |
| Q3 2024 | 9 | $47.2K | 454,450 | 2 | 1 | 1 | 16.1% |
| Q2 2024 | 7 | $68.1K | 457,354 | 0 | 2 | 1 | 16.0% |
| Q1 2024 | 8 | $132.3K | 459,215 | 3 | 1 | 1 | 15.9% |
| Q4 2023 | 5 | $160.6K | 430,835 | 0 | 1 | 2 | 17.1% |
| Q3 2023 | 6 | $162.2K | 516,168 | 0 | 1 | 2 | 14.5% |
| Q2 2023 | 7 | $165.8K | 625,678 | 0 | 0 | 3 | 12.1% |
| Q1 2023 | 8 | $112.7K | 748,222 | 0 | 1 | 2 | 0.0% |
| Q4 2022 | 11 | $227.6K | 905,136 | 2 | 3 | 1 | 0.0% |
| Q3 2022 | 11 | $616.0K | 1,069,529 | 2 | 0 | 1 | 7.5% |
| Q2 2022 | 9 | $642.0K | 1,058,321 | 0 | 0 | 2 | 7.6% |
| Q1 2022 | 11 | $1.5M | 1,212,806 | 0 | 0 | 4 | 6.7% |
| Q4 2021 | 13 | $2.7M | 1,401,462 | 0 | 4 | 2 | 5.9% |
| Q3 2021 | 16 | $3.2M | 1,456,770 | 1 | 3 | 3 | 6.7% |
| Q2 2021 | 16 | $6.1M | 1,534,741 | 16 | 0 | 0 | 4.3% |