Raymond M. Jordt - 01 Jan 2026 Form 4 Insider Report for Altimmune, Inc. (ALT)

Role: Chief Business Officer
Signature: /s/ Gregory Weaver, as Attorney-in-Fact
Issuer symbol: ALT
Transactions as of: 01 Jan 2026
Net transactions value: -$8,935
Form type: 4
Filing time: 05 Jan 2026, 16:10:21 UTC
Previous filing: 04 Aug 2025
Next filing: 27 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Jordt Raymond M	Chief Business Officer	910 CLOPPER ROAD, SUITE 201S, GAITHERSBURG	/s/ Gregory Weaver, as Attorney-in-Fact	05 Jan 2026	0001960780

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ALT	Common Stock, par value $0.0001	Options Exercise	$0	+9,375	+26%	$0.000000	45,645	01 Jan 2026	Direct	F1
transaction	ALT	Common Stock, par value $0.0001	Tax liability	$8,935	-2,475	-5.4%	$3.61	43,170	01 Jan 2026	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ALT	Restricted Stock Units	Options Exercise	$0	-9,375	-50%	$0.000000	9,375	01 Jan 2026	Common Stock, par value $0.0001	9,375		Direct	F1, F3

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

Explanation of Responses:

Id	Content
F1	Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested.
F2	Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs.
F3	RSUs become vested and released over four (4) years with 25% of the shares vesting on January 1, 2024, with the remainder vesting in equal annual installments for the following three (3) years, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date.