Altimmune, Inc. (ALT) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

0Shares Outstanding

4,320,622Shares held by institutions

$12,443,391Value of institutional holdings

45.36%Institutional ownership %

3.77%Shares Changed QoQ

178No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Altimmune, Inc. (NASDAQ:ALT) is held by 180 institutional investors per 13F filings through December 2025.

These investors collectively held 61.3% of Altimmune's outstanding shares in December 2025, up from 47.0% in September 2025.
Their total shares held in ALT increased 34.52% from the prior quarter, while the number of investors in Altimmune increased 1.69% year over year.
Of these 180 funds, 119 grew their exposure to Altimmune, 31 cut back, and 30 maintained positions.
Combined, these investors held 54.83Mn shares in ALT for December 2025, up by 14.07Mn shares quarter on quarter, and up 12.57Mn shares year over year.
BlackRock, Inc. leads ownership in ALT with 9.7Mn shares as of December 31, 2025, equal to 10.85% of outstanding shares.
Top purchasers of ALT stock for the quarter ending December 2025 included BlackRock, Inc. (3.33Mn), VANGUARD GROUP INC (3.12Mn), State Street Corp (1.52Mn), JANE STREET GROUP, LLC (1.5Mn), Nuveen, LLC (1.04Mn).
The biggest sellers of Altimmune for the quarter ending December 2025 included TWO SIGMA INVESTMENTS, LP (731.16K), TWO SIGMA ADVISERS, LP (634.5K), Squarepoint Ops LLC (549.75K), Bank Of America Corp /De/ (257.1K), ExodusPoint Capital Management, LP (166.26K).
Altimmune's 10 largest shareholders as of December 2025 include BlackRock, Inc. (9.7Mn), VANGUARD GROUP INC (9.49Mn), State Street Corp (5.12Mn), GEODE CAPITAL MANAGEMENT, LLC (2.29Mn), TANG CAPITAL MANAGEMENT LLC (2.13Mn), JANE STREET GROUP, LLC (1.78Mn), SUSQUEHANNA INTERNATIONAL GROUP, LLP (1.37Mn), Morgan Stanley (1.36Mn), Goldman Sachs Group Inc (1.35Mn), D. E. Shaw & Co., Inc. (1.34Mn) per Business Quant data.

180 Institutional Holders

4,320,622 Total Shares Held

Rows:

Download Data

Owner Name	Date	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	3,331,039	52.27%	$0.00
VANGUARD GROUP INC	31 Dec, 2025	3,117,521	48.91%	$0.00
Nuveen, LLC	31 Dec, 2025	1,041,856	514.87%	$0.00
Barclays Plc	31 Dec, 2025	-95,429	-19.24%	$0.00
State Street Corp	31 Dec, 2025	1,518,448	42.16%	$0.00
UBS Group AG	31 Dec, 2025	-789	-0.12%	$0.00
HSBC HOLDINGS PLC	31 Dec, 2025	191,316	261.63%	$0.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	275,025	13.63%	$0.00
Soviero Asset Management, LP	31 Dec, 2025	400,000	0.00%	$0.00
Rockefeller Capital Management L.P.	31 Dec, 2025	86,280	159,777.78%	$0.00
TANG CAPITAL MANAGEMENT LLC	31 Dec, 2025	0	0.00%	$0.00
Beirne Wealth Consulting Services, LLC	31 Dec, 2025	-34,000	-8.28%	$0.00
JANE STREET GROUP, LLC	31 Dec, 2025	1,503,751	536.67%	$0.00
BROWN WEALTH MANAGEMENT, LLC	31 Dec, 2025	25,000	10.70%	$0.00
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	-5,165	-0.38%	$0.00
Steward Partners Investment Advisory, LLC	31 Dec, 2025	26,084	11.89%	$0.00
Morgan Stanley	31 Dec, 2025	-131,164	-8.80%	$0.00
Jump Financial, LLC	31 Dec, 2025	126,217	109.00%	$0.00
Goldman Sachs Group Inc	31 Dec, 2025	787,036	139.98%	$0.00
Hennion & Walsh Asset Management, Inc.	31 Dec, 2025	29,057	15.66%	$0.00

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