SIGA Technologies
SIGA
200 hedge funds and large institutions have $219M invested in SIGA Technologies in 2025 Q4 according to their latest regulatory filings, with 26 funds opening new positions, 77 increasing their positions, 61 reducing their positions, and 20 closing their positions.
162% more call options, than puts
Call options by funds: $370K | Put options by funds: $141K
30% more first-time investments, than exits
New positions opened: 26 | Existing positions closed: 20
26% more repeat investments, than reductions
Existing positions increased: 77 | Existing positions reduced: 61
2.56% more ownership
Funds ownership: 47.47% → 50.03% (+2.6%)
2% more funds holding
Funds holding: 197 → 200 (+3)
30% less capital invested
Capital invested by funds: $311M → $219M (-$91.9M)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AQR Capital Management
Greenwich,
Connecticut
|
+$3.73M |
| 2 |
Millennium Management
New York
|
+$1.66M |
| 3 |
Acadian Asset Management
Boston,
Massachusetts
|
+$1.48M |
| 4 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$1.35M |
| 5 |
Bank of America
Charlotte,
North Carolina
|
+$872K |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Federated Hermes
Pittsburgh,
Pennsylvania
|
-$1.49M |
| 2 |
Morgan Stanley
New York
|
-$1.16M |
| 3 |
UBS Group
Zurich,
Switzerland
|
-$1.07M |
| 4 |
Walleye Capital
New York
|
-$832K |
| 5 |
Janus Henderson Group
London,
|
-$714K |
SIGA Hedge Fund Activity: Q4 2025 in Review
200 of the 8,270 institutional investors tracked by Wall St. Rank reported a position in SIGA Technologies (SIGA) for Q4 2025, worth a combined $219M — down 30% from $311M a quarter earlier.
Buyers outnumbered sellers: 26 funds opened new SIGA positions and 20 closed out — a net gain of 6 holders — while 77 added to existing stakes and 61 trimmed.
The largest buyer was AQR Capital Management, adding an estimated $3.73M. The largest seller was Federated Hermes, cutting an estimated $1.49M.
- 200 institutional investors held SIGA Technologies (SIGA) as of Q4 2025, up from 197 in Q3 2025.
- Funds reported $219M of SIGA Technologies stock for Q4 2025, down 30% quarter-over-quarter.
- 26 funds opened new SIGA Technologies positions in Q4 2025 and 20 closed out, a net change of +6 holders.
- The largest SIGA Technologies buyer in Q4 2025 was AQR Capital Management, an estimated $3.73M added.
- The largest SIGA Technologies seller in Q4 2025 was Federated Hermes, an estimated $1.49M sold.
Based on aggregated 13F filings for Q4 2025.