Catherine A. Sohn - Sep 25, 2025 Form 4 Insider Report for Altimmune, Inc. (ALT)

Role
Director
Signature
/s/ Gregory Weaver, as Attorney-in-Fact
Stock symbol
ALT
Transactions as of
Sep 25, 2025
Transactions value $
$0
Form type
4
Date filed
9/29/2025, 04:21 PM
Previous filing
Sep 24, 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Sohn Catherine A. Director C/O ALTIMMUNE, INC., 910 CLOPPER ROAD,, SUITE 201S, GAITHERSBURG /s/ Gregory Weaver, as Attorney-in-Fact 2025-09-29 0001555132

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 Stock Options (option to buy) Award $0 +48.8K $0.00 48.8K Sep 25, 2025 Common Stock, par value $0.0001 48.8K $3.92 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following September 25, 2025, subject to the reporting person's continued service through the applicable vesting date.