GAITHERSBURG, MD
ALTIMMUNE, INC.ALT— Latest position per institution from SEC 13F filings
15
Institutional holders
75.83M
Total shares held
244.06M
Estimated value
3.79M
Avg. position size
BLACKROCK, INC.
CIK 2012383
Shares
12.80M
Value
39.41M
Filed
Mar 31, 2026
VANGUARD GROUP INC
CIK 102909
Shares
9.49M
Value
34.26M
Filed
Dec 31, 2025
STATE STREET CORP
CIK 93751
Shares
7.15M
Value
22.01M
Filed
Mar 31, 2026
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
Shares
5.66M
Value
17.43M
Filed
Mar 31, 2026
VANGUARD PORTFOLIO MANAGEMENT LLC
CIK 2100121
Shares
5.38M
Value
16.58M
Filed
Mar 31, 2026
BLACKROCK FINANCE, INC.
CIK 1364742
Shares
5.32M
Value
35.39M
Filed
Jun 30, 2024
MARSHALL WACE, LLP
CIK 1318757
Shares
4.02M
Value
12.38M
Filed
Mar 31, 2026
MILLENNIUM MANAGEMENT LLC
CIK 1273087
Shares
3.26M
Value
10.04M
Filed
Mar 31, 2026
GEODE CAPITAL MANAGEMENT, LLC
CIK 1214717
Shares
3.11M
Value
9.57M
Filed
Mar 31, 2026
CORMORANT ASSET MANAGEMENT, LP
CIK 1583977
Shares
3M
Value
49.35K
Filed
Dec 31, 2022
ALYESKA INVESTMENT GROUP, L.P.
CIK 1453072
Shares
2.64M
Value
8.15M
Filed
Mar 31, 2026
TWO SIGMA INVESTMENTS, LP
CIK 1179392
Shares
2.48M
Value
7.64M
Filed
Mar 31, 2026
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 1446194
Shares
2.44M
Value
7.52M
Filed
Mar 31, 2026
NUVEEN, LLC
CIK 1871926
Shares
2.33M
Value
7.19M
Filed
Mar 31, 2026
GOLDMAN SACHS GROUP INC
CIK 886982
Shares
1.35M
Value
4.16M
Filed
Mar 31, 2026
DRIEHAUS CAPITAL MANAGEMENT LLC
CIK 938206
Shares
1.22M
Value
15.61K
Filed
Sep 30, 2022
PICTET ASSET MANAGEMENT SA
CIK 1361570
Shares
1.08M
Value
17.74K
Filed
Dec 31, 2022
BELLEVUE GROUP AG
CIK 1674546
Shares
1.06M
Value
5.28M
Filed
Mar 31, 2025
DIMENSIONAL FUND ADVISORS LP
CIK 354204
Shares
1.05M
Value
3.22M
Filed
Mar 31, 2026
IKARIAN CAPITAL, LLC
CIK 1778253
Shares
1M
Value
3.77M
Filed
Sep 30, 2025
| # | Institution | CIK | Shares | Est. Value | Period |
|---|---|---|---|---|---|
| 1 | BLACKROCK, INC. | 2012383 | 12.80M | 39.41M | Mar 31, 2026 |
| 2 | VANGUARD GROUP INC | 102909 | 9.49M | 34.26M | Dec 31, 2025 |
| 3 | STATE STREET CORP | 93751 | 7.15M | 22.01M | Mar 31, 2026 |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 2100119 | 5.66M | 17.43M | Mar 31, 2026 |
| 5 | VANGUARD PORTFOLIO MANAGEMENT LLC | 2100121 | 5.38M | 16.58M | Mar 31, 2026 |
| 6 | BLACKROCK FINANCE, INC. | 1364742 | 5.32M | 35.39M | Jun 30, 2024 |
| 7 | MARSHALL WACE, LLP | 1318757 | 4.02M | 12.38M | Mar 31, 2026 |
| 8 | MILLENNIUM MANAGEMENT LLC | 1273087 | 3.26M | 10.04M | Mar 31, 2026 |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 1214717 | 3.11M | 9.57M | Mar 31, 2026 |
| 10 | CORMORANT ASSET MANAGEMENT, LP | 1583977 | 3M | 49.35K | Dec 31, 2022 |
| 11 | ALYESKA INVESTMENT GROUP, L.P. | 1453072 | 2.64M | 8.15M | Mar 31, 2026 |
| 12 | TWO SIGMA INVESTMENTS, LP | 1179392 | 2.48M | 7.64M | Mar 31, 2026 |
| 13 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 1446194 | 2.44M | 7.52M | Mar 31, 2026 |
| 14 | NUVEEN, LLC | 1871926 | 2.33M | 7.19M | Mar 31, 2026 |
| 15 | GOLDMAN SACHS GROUP INC | 886982 | 1.35M | 4.16M | Mar 31, 2026 |
| 16 | DRIEHAUS CAPITAL MANAGEMENT LLC | 938206 | 1.22M | 15.61K | Sep 30, 2022 |
| 17 | PICTET ASSET MANAGEMENT SA | 1361570 | 1.08M | 17.74K | Dec 31, 2022 |
| 18 | BELLEVUE GROUP AG | 1674546 | 1.06M | 5.28M | Mar 31, 2025 |
| 19 | DIMENSIONAL FUND ADVISORS LP | 354204 | 1.05M | 3.22M | Mar 31, 2026 |
| 20 | IKARIAN CAPITAL, LLC | 1778253 | 1M | 3.77M | Sep 30, 2025 |
Data sourced from SEC Form 13F institutional holdings reports. Positions reflect the most recent filing per institution.