Altimmune, Inc. — Director's Dealing 2026

Feb 2, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Altimmune, Inc. (ALT)
CIK: 0001326190
Period of Report: 2026-01-30

Reporting Person: Garg Vipin K (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-01-30	Common Stock, par value $0.0001	M	26775	—	Acquired	429225	Direct
2026-01-30	Common Stock, par value $0.0001	F	11632	$5.60	Disposed	417593	Direct
2026-01-31	Common Stock, par value $0.0001	A	6926	$3.07	Acquired	424519	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-01-30	Restricted Stock Units	$	M	26775	Disposed		Common Stock, par value $0.0001 (26775)	Direct

Footnotes

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: These shares were purchased due to participation by the reporting individual in the Issuer's 2019 Employee Stock Purchase Plan ("ESPP"). It pertains to the ESPP purchase period from August 1, 2025 through January 31, 2026

F4: In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the Issuer's common stock on August 1, 2025

F5: The RSUs become vested in substantially equal annual installments over the 4 years following January 30, 2023, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date.