Altimmune grants director Howarth 160,000 stock options

The director's options carry an exercise price of $2.02 per share and expire November 2, 2036.

Available on EDGAR 11/04/2026 - 04:04 PM EST Accepted by SEC EDGAR 11/04/2026 - 04:04 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Altimmune, Inc. director Alex G. Howarth received a grant of 160,000 stock options on November 2, 2026, covering 160,000 shares of common stock. The options vest in substantially equal monthly installments over the 36 months following November 2, 2026, subject to continued service through the applicable vesting date.

Insider Trade Summary

Grant/Award: 160,000 shares

Grant/Award 1 txn

Insider Howarth Alex G.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Options (option to buy) F1	160,000	$0.00	$0.00

Holdings After Transaction: Stock Options (option to buy) — 160,000 contracts (Direct)

Holdings Before and After: Stock Options (option to buy), 0 to 160,000 contracts (Direct)

Footnotes (1)

1. F1. The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following November 2, 2026, subject to the reporting person's continued service through the applicable vesting date.

Key Figures

Stock options granted: 160,000 options Shares underlying options: 160,000 shares Exercise price: $2.02 per share +1 more

4 metrics

Stock options granted 160,000 options Granted November 2, 2026

Shares underlying options 160,000 shares Common stock

Exercise price $2.02 per share Options to acquire common stock

Option expiration date November 2, 2036 Options granted November 2, 2026

Key Terms

vested and exercisable, substantially equal monthly installments, continued service

3 terms

vested and exercisable technical

"become vested and exercisable"

substantially equal monthly installments technical

"in substantially equal monthly installments"

continued service technical

"subject to the reporting person's continued service"

FAQ

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What is the exercise price and expiration date of Alex G. Howarth's ALT options?

The options have an exercise price of $2.02 per share and expire on November 2, 2036.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Howarth Alex G.

(Last) (First) (Middle)

350 MOUNT KEMBLE AVENUE

SUITE 1001

(Street)

MORRISTOWN NEW JERSEY 07960

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Altimmune, Inc. [ ALT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/02/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Options (option to buy)	$2.02	11/02/2026		A		160,000		(1)	11/02/2036	Common Stock, par value $0.0001	160,000	$0	160,000	D

Explanation of Responses:

1. The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 36 months following November 2, 2026, subject to the reporting person's continued service through the applicable vesting date.

	/s/ Gregory Weaver, as Attorney-in-Fact	11/04/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)