Altimmune
ALT
181 hedge funds and large institutions have $198M invested in Altimmune in 2025 Q4 according to their latest regulatory filings, with 48 funds opening new positions, 74 increasing their positions, 28 reducing their positions, and 22 closing their positions.
164% more repeat investments, than reductions
Existing positions increased: 74 | Existing positions reduced: 28
118% more first-time investments, than exits
New positions opened: 48 | Existing positions closed: 22
27% more capital invested
Capital invested by funds: $157M → $198M (+$41.5M)
15% more funds holding
Funds holding: 158 → 181 (+23)
5.57% more ownership
Funds ownership: 47% → 52.56% (+5.6%)
17% less call options, than puts
Call options by funds: $13.1M | Put options by funds: $15.7M
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
+$14.5M |
| 2 |
Vanguard Group
Malvern,
Pennsylvania
|
+$13.6M |
| 3 |
State Street
Boston,
Massachusetts
|
+$6.62M |
| 4 |
Jane Street
New York
|
+$6.56M |
| 5 |
N
Nuveen
Charlotte,
North Carolina
|
+$4.54M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Two Sigma Investments
New York
|
-$3.19M |
| 2 |
Two Sigma Advisers
New York
|
-$2.77M |
| 3 |
Squarepoint
New York
|
-$2.4M |
| 4 |
Point72 Asset Management
Stamford,
Connecticut
|
-$1.8M |
| 5 |
Simplex Trading
Chicago,
Illinois
|
-$932K |
ALT Hedge Fund Activity: Q4 2025 in Review
181 of the 8,227 institutional investors tracked by Wall St. Rank reported a position in Altimmune (ALT) for Q4 2025, worth a combined $198M — up 27% from $157M a quarter earlier.
Buyers outnumbered sellers: 48 funds opened new ALT positions and 22 closed out — a net gain of 26 holders — while 74 added to existing stakes and 28 trimmed.
The largest buyer was BlackRock, adding an estimated $14.5M. The largest seller was Two Sigma Investments, cutting an estimated $3.19M.
- 181 institutional investors held Altimmune (ALT) as of Q4 2025, up from 158 in Q3 2025.
- Funds reported $198M of Altimmune stock for Q4 2025, up 27% quarter-over-quarter.
- 48 funds opened new Altimmune positions in Q4 2025 and 22 closed out, a net change of +26 holders.
- The largest Altimmune buyer in Q4 2025 was BlackRock, an estimated $14.5M added.
- The largest Altimmune seller in Q4 2025 was Two Sigma Investments, an estimated $3.19M sold.
Based on aggregated 13F filings for Q4 2025.