Jerome Benedict Durso - 01 Dec 2025 Form 4 Insider Report for Altimmune, Inc. (ALT)

Role
CEO-elect, Director
Signature
/s/ Gregory Weaver, as Attorney-in-Fact
Issuer symbol
ALT
Transactions as of
01 Dec 2025
Net transactions value
$0
Form type
4
Filing time
01 Dec 2025, 20:38:33 UTC
Previous filing
29 Sep 2025
Next filing
22 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Durso Jerome Benedict CEO-elect, Director C/O ALTIMMUNE, INC., 910 CLOPPER ROAD, SUITE 201S, GAITHERSBURG /s/ Gregory Weaver, as Attorney-in-Fact 01 Dec 2025 0001698665

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 +1,824,400 $0.000000 1,824,400 01 Dec 2025 Common Stock, par value $0.0001 1,824,400 $4.93 Direct F1
transaction ALT Restricted Stock Units Award $0 +633,700 $0.000000 633,700 01 Dec 2025 Common Stock, par value $0.0001 633,700 Direct F2, F3
* 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 over four (4) years with 25% of the shares vesting on December 1, 2026, with the remainder vesting in equal monthly installments for the following thirty-six (36) months, subject to the reporting person's continued service on each applicable vesting date.
F2 Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested.
F3 The RSUs become vested over four (4) years with 25% of the shares vesting December 1, 2026, 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.

Remarks:

Mr. Durso has been appointed President and Chief Executive Officer of the Company effective January 1, 2026.