Altimmune, Inc.

ALT

Exchange: Nasdaq
Industry: Pharmaceutical Preparations
SEC CIK: 0001326190

SEC filings (opens in a new tab)

In the last 90 days, Altimmune, Inc. insiders filed 1 open-market purchase and 0 sales; 210 institutions reported holding it in 13F filings for Q2 2026, worth $456.1M in total; Viking Global Investors is the only superinvestor holding it.

Q4 2025 vs. Q3 2025

How the institutions holding Altimmune, Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025 All holders in Q3 2025

13F holders of ALT: Q3 2025 compared with Q4 2025
Measure	Q3 2025	Of which not filed for Q4 2025	Q4 2025	Change
Holders	159	3	183	+27
Shares	41.5M	35.4K	55.1M	+13.6M (+32.8%)
Value	$156.4M	$134.1K	$198.8M	+$42.6M (+27.2%)

3 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (48)

Institutions that held Altimmune, Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to ALT in Q4 2025
Institution	Shares	Value	% of portfolio
Marshall Wace, LLP	922,777	$3.33M	0.00%
Schroder Investment Management Group	469,013	$1.69M	0.00%
Soviero Asset Management, LP	400,000	$1.44M	0.75%
Pavaki Capital Management LLC	215,400	$777.6K	0.54%
Grantham, Mayo, Van Otterloo & Co. LLC	172,559	$622.9K	0.00%
Los Angeles Capital Management LLC	128,529	$523.1K	0.00%
Jacobs Levy Equity Management, Inc	124,821	$450.6K	0.00%
Nomura Asset Management International Inc.	100,000	$361.0K	0.00%
Alps Advisors Inc	85,677	$309.3K	0.00%
LMR Partners LLP	61,300	$221.3K	0.00%
Balyasny Asset Management LLC	60,109	$217.0K	0.00%
Blair William & Co	56,434	$203.7K	0.00%
Voleon Capital Management LP	47,055	$169.9K	0.00%
Acadian Asset Management LLC	35,732	$128.0K	0.00%
Kovack Advisors, Inc.	35,215	$127.1K	0.01%
Fox Run Management, L.L.C.	30,603	$110.5K	0.02%
Canada Pension Plan Investment Board	30,000	$108.3K	0.00%
DRW Securities, LLC	22,469	$81.1K	0.01%
AQR Capital Management LLC	21,147	$76.3K	0.00%
Man Group plc	18,936	$68.4K	0.00%
Keudell/Morrison Wealth Management	18,500	$66.8K	0.01%
Vines Capital Management, LLC	17,884	$64.6K	0.06%
EFG International AG	16,500	$59.6K	0.00%
PKS Advisory Services, LLC	15,100	$54.5K	0.01%
Wiley Bros.-Aintree Capital, LLC	15,035	$54.3K	0.00%
Vontobel Holding Ltd.	15,000	$54.1K	0.00%
Martingale Asset Management L P	14,355	$51.8K	0.00%
TCG Advisory Services, LLC	14,218	$51.3K	0.00%
Northeast Financial Group, Inc.	13,393	$48.3K	0.01%
Schonfeld Strategic Advisors LLC	13,021	$47.0K	0.00%
Gotham Asset Management, LLC	12,669	$45.7K	0.00%
Change Path, LLC	10,500	$37.9K	0.00%
Quadrature Capital Ltd	10,101	$36.5K	0.00%
HighMark Wealth Management LLC	2,000	$7.22K	0.00%
Caitong International Asset Management Co., Ltd	1,924	$6.95K	0.00%
Trust Co of Vermont	1,000	$3.61K	0.00%
Leonteq Securities AG	1,000	$3.61K	0.00%
UBS Asset Management Americas Inc	672	$2.43K	0.00%
Signaturefd, LLC	490	$1.77K	0.00%
Legacy Wealth Managment, LLC	250	$903	0.00%
TD Private Client Wealth LLC	193	$697	0.00%
LRI Investments, LLC	123	$444	0.00%
Allworth Financial LP	89	$322	0.00%
Clearstead Advisors, LLC	40	$143	0.00%
Comerica Bank	28	$101	0.00%
Rothschild Investment LLC	1	$4	0.00%
Commonwealth Retirement Investments LLC	1	$4	0.00%
Motiv8 Investments LLC	67	$0	0.00%

Sold out (21)

Institutions that held Altimmune, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of ALT in Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Point72 Asset Management, L.P.	476,926	$1.80M
Simplex Trading, LLC	213,709	$805.0K
Gsa Capital Partners LLP	116,770	$440.0K
Macquarie Group Ltd	100,000	$377.0K
DLD Asset Management, LP	50,000	$188.5K
Sig Brokerage, LP	34,502	$130.1K
Kraematon Investment Advisors, Inc	17,435	$65.7K
Fortis Capital Management LLC	16,606	$62.6K
Walleye Trading LLC	14,759	$55.6K
Cambridge Investment Research Advisors, Inc.	12,532	$47.0K
Quarry LP	5,019	$18.9K
HighTower Advisors, LLC	4,909	$18.5K
FNY Investment Advisers, LLC	5,000	$18.0K
Groupe la Francaise	1,200	$3.87K
NBC Securities, Inc.	1,000	$3.77K
Global Retirement Partners, LLC	1,000	$3.77K
Hollencrest Capital Management	770	$2.90K
Bessemer Group Inc	660	$2.00K
IFP Advisors, Inc	200	$754
Ameritas Advisory Services, LLC	200	$754
Federated Hermes, Inc.	75	$283

Not filed for Q4 2025 yet (3)

Institutions that held Altimmune, Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding ALT in Q3 2025 that haven't filed for Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Wolverine Trading, LLC	21,820	$82.7K
Point72 (DIFC) Ltd	8,143	$30.7K
Point72 Europe (London) LLP	5,484	$20.7K