Vipin K. Garg - Feb 2, 2023 Form 4 Insider Report for Altimmune, Inc. (ALT)

Role: President and CEO, Director
Signature: /s/ Richard Eisenstadt, as Attorney-in-Fact
Stock symbol: ALT
Transactions as of: Feb 2, 2023
Transactions value $: -$126,667
Form type: 4
Date filed: 2/6/2023, 03:30 PM
Previous filing: Feb 2, 2023
Next filing: Aug 2, 2023

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	+19K	+7.94%	$0.00	258K	Feb 2, 2023	Direct	F1
transaction	ALT	Common Stock, par value $0.0001	Tax liability	-$127K	-8.42K	-3.27%	$15.04	249K	Feb 2, 2023	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	-19K	-25%	$0.00	56.9K	Feb 2, 2023	Common Stock, par value $0.0001	19K		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	The RSUs become vested in substantially equal annual installments over the 4 years following February 2, 2022, subject to the reporting person's continued service through the applicable vesting date, and have no expiration date.