Ticker · CUSIP 826917106
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.
SEC event timeline
15 events
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−82,080 shares · 2025Q413F
- D.E. Shaw & Co. added2026-02-17+54,818 shares · 2025Q413F
- Two Sigma Investments opened position2026-02-17+10,400 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) added2026-02-17+232,973 shares · 2025Q413F
- T. Rowe Price added2026-02-17+3,579 shares · 2025Q413F
- Wellington Management trimmed2026-02-17−15,137 shares · 2025Q413F
- AQR Capital Management added2026-02-17+524,714 shares · 2025Q413F
- Renaissance Technologies added2026-02-12+69,600 shares · 2025Q413F
- −36,576 shares · 2025Q313F
- Two Sigma Investments exited2025-11-14−113,735 shares · 2025Q313F
- D.E. Shaw & Co. added2025-11-14+66,731 shares · 2025Q313F
- Wellington Management trimmed2025-11-14−63,223 shares · 2025Q313F
- AQR Capital Management added2025-11-14+328,725 shares · 2025Q313F
- Izzy Englander (Millennium Mgmt) added2025-11-14+199,852 shares · 2025Q313F
- Renaissance Technologies trimmed2025-11-13−290,412 shares · 2025Q313F
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
- Two Sigma Investments+10,400$64K
Added to5
- AQR Capital Management+524,714$3.2M
- Izzy Englander (Millennium Mgmt)+232,973$1.4M
- Renaissance Technologies+69,600$425K
- D.E. Shaw & Co.+54,818$335K
- T. Rowe Price+3,579$22
Trimmed2
- Ken Griffin (Citadel Advisors)−82,080$502K
- Wellington Management−15,137$92K
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined 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
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Ken Griffin Citadel Advisors | 1.04M | $6M |
| 2 | AQR Capital Management | 872.8K | $5M |
| 3 | D.E. Shaw & Co. | 554.6K | $3M |
| 4 | Izzy Englander Millennium Mgmt | 489.3K | $3M |
| 5 | Renaissance Technologies | 378.1K | $2M |
| 6 | Wellington Management | 128.0K | $782K |
| 7 | Ken Griffin Citadel Advisors | 15.0K | $92K |
| 8 | Ken Griffin Citadel Advisors | 10.6K | $65K |
| 9 | Two Sigma Investments | 10.4K | $64K |
| 10 | T. Rowe Price | 46.3K | $284 |
Recent moves
20 transactions
- +232,973 · 2025Q4
- +10,400 · 2025Q4
- −82,080 · 2025Q4
- +524,714 · 2025Q4
- +54,818 · 2025Q4
- −15,137 · 2025Q4
- +3,579 · 2025Q4
- +69,600 · 2025Q4
- −36,576 · 2025Q3
- −63,223 · 2025Q3
- −113,735 · 2025Q3
- +66,731 · 2025Q3
- +328,725 · 2025Q3
- +199,852 · 2025Q3
- −290,412 · 2025Q3
- +85,993 · 2025Q2
- +24,001 · 2025Q2
- +22,055 · 2025Q2
- TRIMD.E. Shaw & Co.−114,833 · 2025Q2
- TRIMT. Rowe Price−563 · 2025Q2
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