Vipin K. Garg - 30 Jan 2026 Form 4 Insider Report for Altimmune, Inc. (ALT)

Role
Director
Signature
/s/ Gregory Weaver, as Attorney-in-Fact
Issuer symbol
ALT
Transactions as of
30 Jan 2026
Net transactions value
-$43,876
Form type
4
Filing time
02 Feb 2026, 16:15:29 UTC
Previous filing
29 Jan 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Garg Vipin K Director 910 CLOPPER ROAD, SUITE 201S, GAITHERSBURG /s/ Gregory Weaver, as Attorney-in-Fact 02 Feb 2026 0001515813

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 +26,775 +6.7% $0.000000 429,225 30 Jan 2026 Direct F1
transaction ALT Common Stock, par value $0.0001 Tax liability $65,139 -11,632 -2.7% $5.60 417,593 30 Jan 2026 Direct F2
transaction ALT Common Stock, par value $0.0001 Award $21,263 +6,926 +1.7% $3.07 424,519 31 Jan 2026 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 -26,775 -50% $0.000000 26,775 30 Jan 2026 Common Stock, par value $0.0001 26,775 Direct F1, F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Vipin K. Garg is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.

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, 2025 through January 31, 2026
F4 In accordance with the ESPP, these shares were purchased based on 85% of the closing price of the Issuer's common stock on August 1, 2025
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.