13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Pharmaceutical Preparations
ALT

ALTIMMUNE INC

185 institutions still hold ALTIMMUNE INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 02155H200·Pharmaceutical Preparations·185 13F holders·last filed Mar 31, 2026
Market cap
—
13F value held
$179M
visible holders
Holders
185
filers reporting
Concentration
21.99%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

185 institutions reported ALT in Q1 2026. BlackRock, Inc. leads at 22.0% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$39M12.8M0.00%Q1 202602
STATE STREET CORP
CIK 0000093751
$22M7.1M0.00%Q1 202603
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$17M5.7M0.00%Q1 202604
Vanguard Portfolio Management
CIK 0002100121· Index
$17M5.4M0.00%Q1 202605
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$10M3.3M0.00%Q1 202606
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$10M3.1M0.00%Q1 202607
CITADEL ADVISORS LLC
CIK 0001423053
$8M2.3M0.00%Q4 202508
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$8M2.5M0.01%Q1 202609
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$8M2.4M0.00%Q1 202610
Nuveen, LLC
CIK 0001871926
$7M2.3M0.00%Q1 202611
D. E. Shaw & Co., Inc.
CIK 0001009207
$5M1.3M0.00%Q4 202512
GOLDMAN SACHS GROUP INC
CIK 0000886982
$4M1.4M0.00%Q1 202613
Knoll Capital Management, LLC
CIK 0001325083
$4M1.1M1.86%Q4 202514
MARSHALL WACE, LLP
CIK 0001318757
$3M923K0.00%Q4 202515
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$3M1.0M0.00%Q1 202616
NORTHERN TRUST CORP
CIK 0000073124· Index
$3M997K0.00%Q1 202617
TWO SIGMA ADVISERS, LP
CIK 0001478735
$3M794K0.01%Q4 202518
UBS Group AG
CIK 0001610520
$3M905K0.00%Q1 202619
VANGUARD FIDUCIARY TRUST CO
CIK 0000933478· Index
$3M869K0.00%Q1 202620
MORGAN STANLEY
CIK 0000895421
$2M775K0.00%Q1 2026
Page 1 of 10
165 more holders available. Log in →
Insiders at ALTIMMUNE INC
Jorkasky Diane →Sohn Catherine A. →Lawver Teri L →Gill John →Durso Jerome Benedict →Weaver Gregory L →Roberts M Scot →Garg Vipin K →