ALT Altimmune, Inc.

NASDAQ
$3.30

Altimmune, Inc. (ALT) Institutional Ownership

What the institutions did with ALT last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.

Managers compared
228
filed both this quarter and last
Managers holding
210
+40 on the quarter
Buyers
145
58 opened new
Sellers
51
18 sold out entirely
Buyer share
74.0%
of managers who traded it
Breadth
+48.0
net buyers, as a share of those trading

Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.

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Ownership map

Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.

Cut Unchanged Added Color saturates at ±50%.

Largest holders

Manager Shares % of reported
BlackRock, Inc. 20.4M 13.5%
Deep Track Capital, LP 19.3M 12.7%
STATE STREET CORP 12.1M 8.0%
TCG Crossover Management, LLC 10.0M 6.6%
VANGUARD CAPITAL MANAGEMENT LLC 8.2M 5.4%
VANGUARD PORTFOLIO MANAGEMENT LLC 7.3M 4.8%
MARSHALL WACE, LLP 6.8M 4.5%
VIKING GLOBAL INVESTORS LP 6.7M 4.4%
RA CAPITAL MANAGEMENT, L.P. 6.5M 4.3%
GEODE CAPITAL MANAGEMENT, LLC 5.0M 3.3%
Woodline Partners LP 3.4M 2.2%
MILLENNIUM MANAGEMENT LLC 3.3M 2.2%
Nantahala Capital Management, LLC 3.0M 2.0%
Trails Edge Capital Partners, LP 2.7M 1.8%
Nuveen, LLC 2.4M 1.6%
TWO SIGMA INVESTMENTS, LP 2.4M 1.6%
GOLDMAN SACHS GROUP INC 2.2M 1.5%
GREAT POINT PARTNERS LLC 1.7M 1.1%
NORTHERN TRUST CORP 1.6M 1.1%
Weiss Asset Management LP 1.5M 1.0%
VANGUARD FIDUCIARY TRUST CO 1.3M 0.9%
Cormorant Asset Management, LP 1.3M 0.8%
AQR CAPITAL MANAGEMENT LLC 1.2M 0.8%
CITADEL ADVISORS LLC 983.6K 0.6%
UBS Group AG 866.4K 0.6%

Largest changes

Manager Action Previous Current Change
Deep Track Capital, LP New 0 19.3M +19.3M
TCG Crossover Management, LLC New 0 10.0M +10.0M
BlackRock, Inc. Increased 12.8M 20.4M +7.6M
VIKING GLOBAL INVESTORS LP New 0 6.7M +6.7M
RA CAPITAL MANAGEMENT, L.P. New 0 6.5M +6.5M
STATE STREET CORP Increased 7.1M 12.1M +5.0M
Woodline Partners LP New 0 3.4M +3.4M
Nantahala Capital Management, LLC New 0 3.0M +3.0M
MARSHALL WACE, LLP Increased 4.0M 6.8M +2.8M
Trails Edge Capital Partners, LP New 0 2.7M +2.7M
Alyeska Investment Group, L.P. Sold Out 2.6M 0 -2.6M
VANGUARD CAPITAL MANAGEMENT LLC Increased 5.7M 8.2M +2.5M
VANGUARD PORTFOLIO MANAGEMENT LLC Increased 5.4M 7.3M +1.9M
GEODE CAPITAL MANAGEMENT, LLC Increased 3.1M 5.0M +1.9M
GREAT POINT PARTNERS LLC New 0 1.7M +1.7M
Weiss Asset Management LP New 0 1.5M +1.5M
Cormorant Asset Management, LP New 0 1.3M +1.3M
AQR CAPITAL MANAGEMENT LLC Increased 85.5K 1.2M +1.1M
GOLDMAN SACHS GROUP INC Increased 1.4M 2.2M +863.8K
Ghisallo Capital Management LLC New 0 750.0K +750.0K
SCHRODER INVESTMENT MANAGEMENT GROUP Sold Out 667.8K 0 -667.8K
NORTHERN TRUST CORP Increased 996.7K 1.6M +602.5K
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced 1.3M 731.1K -594.9K
CITADEL ADVISORS LLC Increased 448.9K 983.6K +534.7K
D. E. Shaw & Co., Inc. Reduced 727.0K 201.6K -525.4K
Rock Springs Capital Management LP New 0 471.5K +471.5K
VANGUARD FIDUCIARY TRUST CO Increased 869.3K 1.3M +423.7K
DIMENSIONAL FUND ADVISORS LP Reduced 1.0M 639.4K -406.5K
Hennion & Walsh Asset Management, Inc. Increased 202.0K 518.2K +316.2K
LMR Partners LLP New 0 300.0K +300.0K
Bank of New York Mellon Corp Increased 413.5K 689.7K +276.2K
CHARLES SCHWAB INVESTMENT MANAGEMENT INC Increased 351.7K 624.5K +272.8K
CITIGROUP INC Increased 76.3K 293.9K +217.6K
Jump Financial, LLC New 0 190.0K +190.0K
BANK OF AMERICA CORP /DE/ Increased 570.2K 757.9K +187.7K
Squarepoint Ops LLC Increased 18.1K 202.4K +184.3K
Creative Planning Increased 39.2K 218.3K +179.1K
Point72 Asset Management, L.P. Reduced 665.3K 486.9K -178.4K
WELLINGTON MANAGEMENT GROUP LLP Increased 248.2K 420.3K +172.1K
BARCLAYS PLC Increased 192.9K 351.6K +158.7K
RHUMBLINE ADVISERS Increased 155.7K 309.6K +153.9K
Birchview Capital, LP New 0 152.7K +152.7K
Janney Montgomery Scott LLC Increased 172.6K 302.6K +130.0K
XTX Topco Ltd New 0 128.1K +128.1K
WELLS FARGO & COMPANY/MN Increased 95.9K 217.4K +121.5K
Invesco Ltd. Increased 227.9K 332.6K +104.7K
Susquehanna Portfolio Strategies, LLC New 0 103.4K +103.4K
ADAR1 Capital Management, LLC New 0 102.8K +102.8K
Mariner, LLC New 0 101.1K +101.1K
TWO SIGMA INVESTMENTS, LP Reduced 2.5M 2.4M -97.8K
ALPS ADVISORS INC Increased 105.9K 197.4K +91.5K
HSBC HOLDINGS PLC Reduced 154.4K 64.5K -89.9K
Engineers Gate Manager LP Reduced 116.1K 38.0K -78.1K
FMR LLC Increased 674.0K 749.0K +75.0K
Virtus Investment Advisers, LLC Increased 51.7K 125.4K +73.6K
PRICE T ROWE ASSOCIATES INC /MD/ Increased 92.5K 165.4K +72.9K
RENAISSANCE TECHNOLOGIES LLC New 0 71.6K +71.6K
Nuveen, LLC Increased 2.3M 2.4M +70.8K
Virtu Financial LLC Sold Out 70.5K 0 -70.5K
DEUTSCHE BANK AG\ Increased 124.5K 195.0K +70.5K

13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.