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	Role	Shares	Max Price
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: Insufficient data to determine if 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	679,959	0.77%
Institutions	37,561,916	42.6%
General Public	50,015,378	56.7%

Dilution of Shares: Shareholders have been diluted in the past year, with total shares outstanding growing by 24.2%.

Top Shareholders

Top 25 shareholders own 35.32% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
7.22%	BlackRock, Inc.	6,372,560	US$25.9m	3.87%	no data
5.85%	The Vanguard Group, Inc.	5,167,124	US$21.0m	17.2%	no data
3.12%	State Street Global Advisors, Inc.	2,753,638	US$11.2m	-18.8%	no data
3.12%	Tang Capital Management, LLC	2,750,000	US$11.2m	0%	0.39%
2.19%	Geode Capital Management, LLC	1,934,880	US$7.9m	13.4%	no data
1.93%	Susquehanna International Group, LLP	1,704,076	US$6.9m	58.4%	0.01%
1.27%	Knoll Capital Management	1,121,524	US$4.6m	0%	2.67%
1.11%	Caption Management, LLC	980,781	US$4.0m	2,420%	0.3%
1.04%	Federated Hermes, Inc.	915,458	US$3.7m	388%	0.01%
1.01%	UBS Asset Management AG	891,133	US$3.6m	-0.44%	no data
0.92%	Morgan Stanley	807,844	US$3.3m	28%	no data
0.81%	Bank of America Corporation	713,408	US$2.9m	157%	no data
0.73%	Northern Trust Global Investments	640,346	US$2.6m	0.57%	no data
0.59%	Citadel Advisors LLC	523,461	US$2.1m	0%	no data
0.53%	Group One Trading LLC	469,389	US$1.9m	82.9%	0.05%
0.51%	Dimensional Fund Advisors LP	447,470	US$1.8m	-9.14%	no data
0.5%	Two Sigma Investments, LP	437,286	US$1.8m	-61.9%	no data
0.45%	FMR LLC	401,303	US$1.6m	1,830%	no data
0.4%	Vipin Garg	355,082	US$1.4m	0%	no data
0.39%	Beirne Wealth Consulting Services, LLC	342,458	US$1.4m	16.3%	0.4%
0.38%	BNY Asset Management	332,016	US$1.3m	75.7%	no data
0.34%	The Goldman Sachs Group, Inc.	296,788	US$1.2m	0%	no data
0.33%	Barclays PLC	288,419	US$1.2m	53.9%	no data
0.3%	Virtu Financial, Inc.	267,778	US$1.1m	0%	0.05%
0.29%	Scientech Research LLC	254,312	US$1.0m	0%	0.22%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2025/10/29 19:32
End of Day Share Price	2025/10/29 00:00
Earnings	2025/06/30
Annual Earnings	2024/12/31

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 14 analysts. 9 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
Mayank Mamtani	B. Riley Securities, Inc.
Jonathan Wolleben	Citizens JMP Securities, LLC
Liisa Bayko	Evercore ISI