[Form 4] Altimmune, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Altimmune, Inc. director Wayne Pisano received a grant of stock options to acquire 48,800 shares of common stock at an exercise price of $2.82 per share. The options were issued as part of the company’s non-employee director compensation policy.

The options expire on May 1, 2036 and cover 48,800 underlying shares of common stock. The shares underlying the option vest and become exercisable in substantially equal monthly installments over the 12 months following May 1, 2026, contingent on Mr. Pisano’s continued service.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Pisano Wayne

Role null

Type	Security	Shares	Price	Value
Grant/Award	Stock Options (option to buy)	48,800	$0.00	--

Holdings After Transaction: Stock Options (option to buy) — 48,800 shares (Direct, null)

Footnotes (1)

1. The options were granted pursuant to the Company's non-employee director compensation policy. The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following May 1, 2026, subject to the reporting person's continued service through the applicable vesting date.

Key Figures

Options granted: 48,800 options Exercise price: $2.82 per share Underlying shares: 48,800 shares +2 more

5 metrics

Options granted 48,800 options Grant to director Wayne Pisano

Exercise price $2.82 per share Stock option strike price

Underlying shares 48,800 shares Common stock underlying the options

Expiration date May 1, 2036 Option expiration

Vesting period 12 months Monthly vesting after May 1, 2026

Key Terms

non-employee director compensation policy, stock options, vested and exercisable, underlying security

4 terms

non-employee director compensation policy financial

"The options were granted pursuant to the Company's non-employee director compensation policy."

stock options financial

"The options were granted pursuant to the Company's non-employee director compensation policy."

Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.

vested and exercisable financial

"The shares underlying the option become vested and exercisable in substantially equal monthly installments"

underlying security financial

"underlying_security_title": "Common Stock, par value $0.0001"

Form 4 Insider Transactions: What Each Field Means →

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^*

Pisano Wayne

(Last) (First) (Middle)

910 CLOPPER ROAD

SUITE 201S

(Street)

GAITHERSBURG MARYLAND 20878

(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)
05/01/2026

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)(1)	$2.82	05/01/2026		A		48,800		(2)	05/01/2036	Common Stock, par value $0.0001	48,800	$0	48,800	D

Explanation of Responses:

1. The options were granted pursuant to the Company's non-employee director compensation policy.

2. The shares underlying the option become vested and exercisable in substantially equal monthly installments over the 12 months following May 1, 2026, subject to the reporting person's continued service through the applicable vesting date.

	/s/ Gregory Weaver, as Attorney-in-Fact	05/01/2026
	** 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)