Jerome Benedict Durso - 22 Dec 2025 Form 4 Insider Report for Altimmune, Inc. (ALT)

Role: Director
Signature: /s/ Gregory Weaver, as Attorney-in-Fact
Issuer symbol: ALT
Transactions as of: 22 Dec 2025
Net transactions value: +$51,569
Form type: 4
Filing time: 22 Dec 2025, 16:10:38 UTC
Previous filing: 01 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Durso Jerome Benedict	Director	910 CLOPPER ROAD, SUITE 201S, GAITHERSBURG	/s/ Gregory Weaver, as Attorney-in-Fact	22 Dec 2025	0001698665

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ALT	Common Stock, par value $0.0001	Purchase	$51,569	+12,500		$4.13	12,500	22 Dec 2025	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $4.1200 to $4.1300, inclusive. The reporting person undertakes to provide to Altimmune, Inc., any security holder of Altimmune, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote

Content

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $4.1200 to $4.1300, inclusive. The reporting person undertakes to provide to Altimmune, Inc., any security holder of Altimmune, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote