Ticker · CUSIP 826917106
···Share
Holders (tracked)
10
Combined shares
3,548,172
Combined value
$21.40M
Last close
Quarter
2025Q4
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
1072024Q12025Q4

SEC event timeline

15 events
  1. −82,080 shares · 2025Q4
    13F
  2. +54,818 shares · 2025Q4
    13F
  3. +10,400 shares · 2025Q4
    13F
  4. +232,973 shares · 2025Q4
    13F
  5. +3,579 shares · 2025Q4
    13F
  6. −15,137 shares · 2025Q4
    13F
  7. +524,714 shares · 2025Q4
    13F
  8. +69,600 shares · 2025Q4
    13F
  9. −36,576 shares · 2025Q3
    13F
  10. −113,735 shares · 2025Q3
    13F
  11. +66,731 shares · 2025Q3
    13F
  12. −63,223 shares · 2025Q3
    13F
  13. +328,725 shares · 2025Q3
    13F
  14. +199,852 shares · 2025Q3
    13F
  15. −290,412 shares · 2025Q3
    13F

Insider activity

No insider transactions in the last 30 days.

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions1
Trimmed2
Exited0

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
6
$32.7M
2022Q2
10
$96.8M
2022Q3
10
$104K
2022Q4
11
$47.1M
2023Q1
10
$29.9M
2023Q2
8
$26.2M
2023Q3
8
$26.5M
2023Q4
7
$22.7M
2024Q1
7
$33.8M
2024Q2
9
$41.9M
2024Q3
9
$19.3M
2024Q4
8
$14.7M
2025Q1
9
$14.9M
2025Q2
11
$18.9M
2025Q3
9
$24.9M
2025Q4
10
$21.4M

Who owns SIGA

10 super-investors · 2025Q4
Tracked stake
3.55M
shares
Combined value
$21M
% of shares outstanding
shares-out unknown
Quarter action mix
New1Added5Trim4
#ManagerSharesValue
1Ken Griffin
Citadel Advisors
1.04M$6M
2AQR Capital Management872.8K$5M
3D.E. Shaw & Co.554.6K$3M
4Izzy Englander
Millennium Mgmt
489.3K$3M
5Renaissance Technologies378.1K$2M
6Wellington Management128.0K$782K
7Ken Griffin
Citadel Advisors
15.0K$92K
8Ken Griffin
Citadel Advisors
10.6K$65K
9Two Sigma Investments10.4K$64K
10T. Rowe Price46.3K$284

Recent moves

20 transactions
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