Gregory L. Weaver - 11 Nov 2025 Form 4 Insider Report for Altimmune, Inc. (ALT)

Role
Chief Financial Officer
Signature
/s/ Gregory Weaver
Issuer symbol
ALT
Transactions as of
11 Nov 2025
Net transactions value
-$24,276
Form type
4
Filing time
12 Nov 2025, 16:07:21 UTC
Previous filing
03 Oct 2025
Next filing
27 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
WEAVER GREGORY L Chief Financial Officer 910 CLOPPER ROAD, SUITE 201S, GAITHERSBURG /s/ Gregory Weaver 12 Nov 2025 0001251779

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 +18,750 +188% $0.000000 28,750 11 Nov 2025 Direct F1
transaction ALT Common Stock, par value $0.0001 Tax liability $24,276 -5,672 -20% $4.28 23,078 11 Nov 2025 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 -18,750 -25% $0.000000 56,250 11 Nov 2025 Common Stock, par value $0.0001 18,750 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 over four (4) years with 25% of the shares vesting on November 11, 2025, 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.