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Altimmune
ALT

173 hedge funds and large institutions have $214M invested in Altimmune in 2026 Q1 according to their latest regulatory filings, with 30 funds opening new positions, 82 increasing their positions, 34 reducing their positions, and 33 closing their positions.

New
Increased
Maintained
Reduced
Closed

225% more call options, than puts

Call options by funds: $10.4M | Put options by funds: $3.21M

141% more repeat investments, than reductions

Existing positions increased: 82 | Existing positions reduced: 34

8% more capital invested

Capital invested by funds: $198M → $214M (+$15.5M)

0.76% more ownership

Funds ownership: 52.56% → 53.32% (+0.76%)

9% less first-time investments, than exits

New positions opened: 30 | Existing positions closed: 33

4% less funds holding

Funds holding: 181 → 173 (-8)

Holders
173
Holders Change
-8
Holders Change %
-4.42%
% of All Funds
2.13%
Holding in Top 10
–
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
–
New
30
Increased
82
Reduced
34
Closed
33
Calls
$10.4M
Puts
$3.21M
Net Calls
+$7.22M
Net Calls Change
+$9.84M

Top Buyers

1
Marshall Wace
Marshall Wace
United Kingdom
+$13.1M
2
BlackRock
BlackRock
New York
+$13.1M
3
Millennium Management
Millennium Management
New York
+$13M
4
Alyeska Investment Group
Alyeska Investment Group
Illinois
+$11.2M
5
State Street
State Street
Massachusetts
+$8.6M

Top Sellers

1
Jane Street
Jane Street
New York
-$7.57M
2
TCM
Tang Capital Management
California
-$6.22M
3
KCM
Knoll Capital Management
Florida
-$4.08M
4
Citadel Advisors
Citadel Advisors
Florida
-$3.77M
5
D.E. Shaw & Co
D.E. Shaw & Co
New York
-$2.62M
Name Holding Trade Value Shares
Change 		Change in
Stake
BlackRock
1
BlackRock
New York
$39.4M +$13.1M +3,090,979 +32%
State Street
2
State Street
Massachusetts
$22M +$8.6M +2,025,847 +40%
VCM
3
Vanguard Capital Management
Pennsylvania
$17.4M +$24M +5,658,049 New
VPM
4
Vanguard Portfolio Management
Pennsylvania
$16.6M +$22.9M +5,382,002 New
Marshall Wace
5
Marshall Wace
United Kingdom
$12.4M +$13.1M +3,095,124 +335%
Millennium Management
6
Millennium Management
New York
$10M +$13M +3,050,808 +1,471%
Geode Capital Management
7
Geode Capital Management
Massachusetts
$9.57M +$3.46M +814,686 +36%
Alyeska Investment Group
8
Alyeska Investment Group
Illinois
$8.15M +$11.2M +2,644,600 New
Two Sigma Investments
9
Two Sigma Investments
New York
$7.64M +$5.15M +1,213,217 +96%
N
10
Nuveen
North Carolina
$7.19M +$4.63M +1,090,390 +88%
Goldman Sachs
11
Goldman Sachs
New York
$4.16M +$5.76K +1,356 +0.1%
Susquehanna International Group
12
Susquehanna International Group
Pennsylvania
$4.08M -$183K -43,061 -3%
Dimensional Fund Advisors
13
Dimensional Fund Advisors
Texas
$3.22M +$3.24M +762,223 +269%
Northern Trust
14
Northern Trust
Illinois
$3.07M +$1.19M +280,730 +39%
UBS Group
15
UBS Group
Switzerland
$2.79M +$1.12M +262,720 +41%
VFT
16
Vanguard Fiduciary Trust
Pennsylvania
$2.68M +$3.69M +869,318 New
Morgan Stanley
17
Morgan Stanley
New York
$2.39M -$2.48M -584,627 -43%
D.E. Shaw & Co
18
D.E. Shaw & Co
New York
$2.24M -$2.62M -616,582 -46%
Fidelity Investments
19
Fidelity Investments
Massachusetts
$2.08M +$467K +109,871 +19%
TCM
20
Tang Capital Management
California
$2.05M -$6.22M -1,465,285 -69%
Point72 Asset Management
21
Point72 Asset Management
Connecticut
$2.05M +$2.82M +665,289 New
Schroder Investment Management Group
22
Schroder Investment Management Group
United Kingdom
$1.92M +$844K +198,824 +42%
Bank of America
23
Bank of America
North Carolina
$1.76M +$792K +186,420 +49%
Citadel Advisors
24
Citadel Advisors
Florida
$1.38M -$3.77M -889,054 -66%
BNP Paribas Financial Markets
25
BNP Paribas Financial Markets
France
$1.34M +$1.09M +257,773 +145%
1
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ALT Hedge Fund Activity: Q1 2026 in Review

173 of the 8,126 institutional investors tracked by Wall St. Rank reported a position in Altimmune (ALT) for Q1 2026, worth a combined $214M — up 7.8% from $198M a quarter earlier.

Sellers outnumbered buyers: 33 funds closed out of ALT and 30 opened new positions — a net loss of 3 holders — while 34 trimmed existing stakes and 82 added.

The largest buyer was Marshall Wace, adding an estimated $13.1M. The largest seller was Jane Street, exiting entirely with an estimated $7.57M sold.

  • 173 institutional investors held Altimmune (ALT) as of Q1 2026, down from 181 in Q4 2025.
  • Funds reported $214M of Altimmune stock for Q1 2026, up 7.8% quarter-over-quarter.
  • 30 funds opened new Altimmune positions in Q1 2026 and 33 closed out, a net change of -3 holders.
  • The largest Altimmune buyer in Q1 2026 was Marshall Wace, an estimated $13.1M added.
  • The largest Altimmune seller in Q1 2026 was Jane Street, an estimated $7.57M sold.

Based on aggregated 13F filings for Q1 2026.