Altimmune Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGM:ALT Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
08 Jan 26	BuyUS$20,410	Wayne Pisano	Individual	5,000	US$4.08
05 Jan 26	BuyUS$2,118	Catherine Sohn	Individual	500	US$4.24
29 Dec 25	BuyUS$2,003	Diane Jorkasky	Individual	527	US$3.80
23 Dec 25	BuyUS$51,250	John Gill	Individual	12,500	US$4.10
22 Dec 25	BuyUS$51,569	Jerome Durso	Individual	12,500	US$4.13
17 Mar 25	BuyUS$5,785	Catherine Sohn	Individual	1,000	US$5.78
13 Mar 25	BuyUS$51,996	Gregory Weaver	Individual	10,000	US$5.20

Insider Trading Volume

Insider Buying: ALT insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of ALT?
Owner Type	Number of Shares	Ownership Percentage
Individual Insiders	866,096	0.692%
Institutions	55,145,278	44%
General Public	69,220,143	55.3%

Dilution of Shares: Shareholders have been substantially diluted in the past year, with total shares outstanding growing by 62.6%.

Top Shareholders

Top 25 shareholders own 37.38% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
7.75%	BlackRock, Inc.	9,704,298	US$41.4m	52.3%	no data
7.58%	The Vanguard Group, Inc.	9,491,159	US$40.5m	48.9%	no data
4.09%	State Street Global Advisors, Inc.	5,119,703	US$21.9m	42.2%	no data
1.83%	Geode Capital Management, LLC	2,292,410	US$9.8m	13.6%	no data
1.7%	Tang Capital Management, LLC	2,131,307	US$9.1m	0%	0.4%
1.42%	Jane Street Group, LLC	1,783,950	US$7.6m	537%	0.01%
1.2%	Susquehanna International Group, LLP	1,504,187	US$6.4m	-3.54%	0.01%
1.07%	D. E. Shaw & Co., L.P.	1,343,583	US$5.7m	273%	no data
1.07%	Citadel Advisors LLC	1,337,927	US$5.7m	4.36%	no data
1.01%	Two Sigma Investments, LP	1,265,683	US$5.4m	-36.6%	0.01%
0.99%	Teachers Insurance and Annuity Association-College Retirement Equities Fund	1,238,603	US$5.3m	517%	no data
0.95%	The Goldman Sachs Group, Inc.	1,195,870	US$5.1m	201%	no data
0.95%	Morgan Stanley	1,190,430	US$5.1m	-17.1%	no data
0.9%	Knoll Capital Management	1,121,524	US$4.8m	0%	2.23%
0.74%	Marshall Wace LLP	922,777	US$3.9m	0%	no data
0.63%	Two Sigma Advisers, LP	793,900	US$3.4m	-44.4%	0.01%
0.57%	Northern Trust Global Investments	715,991	US$3.1m	8.98%	no data
0.51%	UBS Asset Management AG	642,720	US$2.7m	-0.02%	no data
0.45%	FMR LLC	564,054	US$2.4m	26.7%	no data
0.37%	Schroder Investment Management Limited	469,013	US$2.0m	0%	no data
0.34%	Vipin Garg	424,519	US$1.8m	19.6%	no data
0.32%	Barclays PLC	400,543	US$1.7m	17.7%	no data
0.32%	Soviero Asset Management, LP	400,000	US$1.7m	0%	0.8%
0.3%	Bank of America Corporation	381,170	US$1.6m	20.2%	no data
0.3%	Beirne Wealth Consulting Services, LLC	376,458	US$1.6m	-8.28%	0.43%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/03/05 20:22
End of Day Share Price	2026/03/05 00:00
Earnings	2025/12/31
Annual Earnings	2025/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Altimmune, Inc. is covered by 17 analysts. 6 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Eliana Merle	Barclays
William Wood	B. Riley Securities, Inc.
Mayank Mamtani	B. Riley Securities, Inc.