Altimmune
ALT
158 hedge funds and large institutions have $157M invested in Altimmune in 2025 Q3 according to their latest regulatory filings, with 23 funds opening new positions, 57 increasing their positions, 48 reducing their positions, and 42 closing their positions.
32% more call options, than puts
Call options by funds: $18.7M | Put options by funds: $14.1M
19% more repeat investments, than reductions
Existing positions increased: 57 | Existing positions reduced: 48
8% more capital invested
Capital invested by funds: $146M → $157M (+$11M)
0.63% more ownership
Funds ownership: 46.37% → 47% (+0.63%)
12% less funds holding
Funds holding: 180 → 158 (-22)
45% less first-time investments, than exits
New positions opened: 23 | Existing positions closed: 42
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Two Sigma Investments
New York
|
+$6.02M |
| 2 |
Two Sigma Advisers
New York
|
+$5.02M |
| 3 |
Vanguard Group
Malvern,
Pennsylvania
|
+$4.66M |
| 4 |
State Street
Boston,
Massachusetts
|
+$3.27M |
| 5 |
Citadel Advisors
Miami,
Florida
|
+$2.93M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Federated Hermes
Pittsburgh,
Pennsylvania
|
-$3.53M |
| 2 |
CM
Caption Management
Oklahoma City,
Oklahoma
|
-$3.28M |
| 3 |
TCM
Tang Capital Management
San Diego,
California
|
-$2.39M |
| 4 |
Bank of America
Charlotte,
North Carolina
|
-$1.53M |
| 5 |
Group One Trading
Chicago,
Illinois
|
-$1.27M |
ALT Hedge Fund Activity: Q3 2025 in Review
158 of the 7,640 institutional investors tracked by Wall St. Rank reported a position in Altimmune (ALT) for Q3 2025, worth a combined $157M — up 7.6% from $146M a quarter earlier.
Sellers outnumbered buyers: 42 funds closed out of ALT and 23 opened new positions — a net loss of 19 holders — while 48 trimmed existing stakes and 57 added.
The largest buyer was Two Sigma Investments, adding an estimated $6.02M. The largest seller was Federated Hermes, cutting an estimated $3.53M.
- 158 institutional investors held Altimmune (ALT) as of Q3 2025, down from 180 in Q2 2025.
- Funds reported $157M of Altimmune stock for Q3 2025, up 7.6% quarter-over-quarter.
- 23 funds opened new Altimmune positions in Q3 2025 and 42 closed out, a net change of -19 holders.
- The largest Altimmune buyer in Q3 2025 was Two Sigma Investments, an estimated $6.02M added.
- The largest Altimmune seller in Q3 2025 was Federated Hermes, an estimated $3.53M sold.
Based on aggregated 13F filings for Q3 2025.