Altimmune, Inc. (ALT) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

89,418,028Shares Outstanding

56,357,300Shares held by institutions

$198,377,696Value of institutional holdings

63.03%Institutional ownership %

36.60%Shares Changed QoQ

180No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

Altimmune, Inc. (NASDAQ:ALT) has 180 institutional investors with active 13F positions as of December 2025.

These investors collectively held 61.3% of Altimmune's outstanding shares in December 2025, up from 47.0% in September 2025.
They increased total shares held in ALT by 34.52% quarter over quarter, and investors in Altimmune increased 1.69% from a year ago.
Activity in ALT broke down as 119 buyers, 31 sellers, and 30 unchanged among 180 total holders.
The aggregate institutional position in Altimmune amounted to 54.83Mn shares as of 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.
The most significant purchases of ALT for the quarter ending December 2025 came from BlackRock, Inc. (3.33Mn), VANGUARD GROUP INC (3.12Mn), Goldman Sachs Group Inc (2.14Mn), State Street Corp (1.52Mn), JANE STREET GROUP, LLC (1.5Mn).
The largest sellers of Altimmune for the quarter ending December 2025 were TWO SIGMA INVESTMENTS, LP (731.16K), TWO SIGMA ADVISERS, LP (634.5K), Squarepoint Ops LLC (549.75K), Barclays Plc (435.71K), Bank Of America Corp /De/ (257.1K).
According to Business Quant data, leading holders of ALT for December 2025 are BlackRock, Inc. (9.7Mn), VANGUARD GROUP INC (9.49Mn), State Street Corp (5.12Mn), Goldman Sachs Group Inc (2.7Mn), 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), D. E. Shaw & Co., Inc. (1.34Mn).

180 Institutional Holders

56,357,300 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	9,704,298	3,331,039	52.27%	$35,032,515.00
VANGUARD GROUP INC	31 Dec, 2025	9,491,159	3,117,521	48.91%	$34,263,084.00
State Street Corp	31 Dec, 2025	5,119,703	1,518,448	42.16%	$18,482,128.00
Goldman Sachs Group Inc	31 Dec, 2025	2,698,586	2,136,329	379.96%	$9,741,896.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	2,292,410	275,025	13.63%	$8,277,782.00
TANG CAPITAL MANAGEMENT LLC	31 Dec, 2025	2,131,307	0	0.00%	$7,694,018.00
JANE STREET GROUP, LLC	31 Dec, 2025	1,783,950	1,503,751	536.67%	$6,440,060.00
SUSQUEHANNA INTERNATIONAL GROUP, LLP	31 Dec, 2025	1,369,017	-5,165	-0.38%	$4,942,151.00
Morgan Stanley	31 Dec, 2025	1,359,885	-131,164	-8.80%	$4,909,186.00
D. E. Shaw & Co., Inc.	31 Dec, 2025	1,343,583	983,188	272.81%	$4,850,335.00
CITADEL ADVISORS LLC	31 Dec, 2025	1,337,927	55,913	4.36%	$4,829,917.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	1,265,683	-731,165	-36.62%	$4,569,116.00
Nuveen, LLC	31 Dec, 2025	1,244,211	1,041,856	514.87%	$4,491,602.00
Knoll Capital Management, LLC	31 Dec, 2025	1,121,524	0	0.00%	$4,048,701.00
MARSHALL WACE, LLP	31 Dec, 2025	922,777	922,777	0.00%	$3,331,226.00
TWO SIGMA ADVISERS, LP	31 Dec, 2025	793,900	-634,500	-44.42%	$2,865,979.00
Northern Trust Corp	31 Dec, 2025	715,991	58,975	8.98%	$2,584,727.00
UBS Group AG	31 Dec, 2025	642,048	-789	-0.12%	$2,317,793.00
FMR LLC	31 Dec, 2025	564,093	118,956	26.72%	$2,036,376.00
SCHRODER INVESTMENT MANAGEMENT GROUP	31 Dec, 2025	469,013	469,013	0.00%	$1,693,137.00

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