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%
Calls
0.0%
Puts
+2
Holder change
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
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 | 8 | $71.1K | 487,587 | 0 | 3 | 1 | 15.3% |
| Q1 2024 | 9 | $138.3K | 487,662 | 3 | 1 | 1 | 15.2% |
| Q4 2023 | 6 | $167.6K | 459,282 | 0 | 1 | 2 | 16.4% |
| Q3 2023 | 7 | $169.2K | 544,650 | 0 | 1 | 2 | 13.9% |
| Q2 2023 | 8 | $171.8K | 654,125 | 0 | 0 | 3 | 11.7% |
| Q1 2023 | 9 | $129.7K | 776,669 | 0 | 1 | 2 | 10.0% |
| Q4 2022 | 13 | $298.6K | 1,102,779 | 2 | 3 | 1 | 7.4% |
| 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% |