Richard I. Eisenstadt - Jan 30, 2024 Form 4 Insider Report for Altimmune, Inc. (ALT)

Role: Chief Financial Officer
Signature: /s/ Richard I. Eisenstadt
Stock symbol: ALT
Transactions as of: Jan 30, 2024
Transactions value $: -$8,885
Form type: 4
Date filed: 2/1/2024, 06:00 PM
Previous filing: Jan 29, 2024

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	+9.28K	+27.86%	$0.00	42.6K	Jan 30, 2024	Direct	F1
transaction	ALT	Common Stock, par value $0.0001	Tax liability	-$21.3K	-2.18K	-5.11%	$9.80	40.4K	Jan 30, 2024	Direct	F2
transaction	ALT	Common Stock, par value $0.0001	Award	$12.4K	+4.62K	+11.44%	$2.69^*	45K	Jan 31, 2024	Direct	F3, F4

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	-9.28K	-25%	$0.00	27.8K	Jan 30, 2024	Common Stock, par value $0.0001	9.28K		Direct	F1, F5

* 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	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, 2023 through January 31, 2024.
F4	In accordance with the ESPP, these shares were purchased based on 85% of the opening price of the issuer's common stock on August 1, 2023.
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.