Altimmune CFO receives 14,475 shares as grants vest

Q: How many ALT shares did CFO Gregory L. Weaver receive?

Gregory L. Weaver acquired 14,475 Altimmune common shares when 14,475 RSUs vested on October 1, 2026.

Q: How many ALT shares were surrendered for taxes?

Gregory L. Weaver surrendered 4,379 common shares at $2.76 per share solely to cover taxes associated with RSU vesting on October 1, 2026.

Q: What was the vesting schedule for Gregory L. Weaver's ALT RSUs?

25% of the RSUs vested on October 1, 2026, with the remainder vesting in equal annual installments over the following three years. Vesting is subject to continued service through each applicable vesting date.

The remaining RSUs vest in equal annual installments over three years, subject to continued service through each vesting date.

Filing Impact

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Filing Sentiment

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Form Type

Rhea-AI Filing Summary

Altimmune, Inc. Chief Financial Officer Gregory L. Weaver reported vesting of 14,475 restricted stock units and acquisition of 14,475 common shares on October 1, 2026. He surrendered 4,379 shares at $2.76 per share solely to cover taxes associated with RSU vesting. The reported RSU balance after the transaction was 43,425. No Rule 10b5-1 plan is reported.

Insider Trade Summary

14,475 shares exercised/converted

Exercise 3 txns

Insider WEAVER GREGORY L

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units ^{F1, F3}	14,475	$0.00	$0.00
Exercise	Common Stock, par value $0.0001 ^F1	14,475	$0.00	$0.00
Tax Withholding	Common Stock, par value $0.0001 ^F2	4,379	$2.76	$12K

Holdings After Transaction: Restricted Stock Units — 43,425 contracts (Direct); Common Stock, par value $0.0001 — 49,927 shares (Direct)

Footnotes (3)

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 October 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.

Key Figures

Restricted stock units vested: 14,475 RSUs Common shares acquired: 14,475 shares Shares surrendered for taxes: 4,379 shares +3 more

6 metrics

Restricted stock units vested 14,475 RSUs October 1, 2026

Common shares acquired 14,475 shares Upon vesting on October 1, 2026

Shares surrendered for taxes 4,379 shares RSU vesting transaction on October 1, 2026

Tax-withholding share price $2.76 per share Shares surrendered for taxes on October 1, 2026

Reported RSU balance after transaction 43,425 RSUs Following the October 1, 2026 transaction

First vesting installment 25% Vested on October 1, 2026

Key Terms

Restricted Stock Unit, contingent right, Vesting transaction

3 terms

Restricted Stock Unit financial

"Each Restricted Stock Unit ("RSU") represents a contingent right"

A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.

contingent right financial

"represents a contingent right to receive one share"

Vesting transaction financial

"Vesting transaction: Shares surrendered to the Issuer solely to cover taxes"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many ALT shares did CFO Gregory L. Weaver receive?

Gregory L. Weaver acquired 14,475 Altimmune common shares when 14,475 RSUs vested on October 1, 2026.

How many ALT shares were surrendered for taxes?

Gregory L. Weaver surrendered 4,379 common shares at $2.76 per share solely to cover taxes associated with RSU vesting on October 1, 2026.

What was the vesting schedule for Gregory L. Weaver's ALT RSUs?

25% of the RSUs vested on October 1, 2026, with the remainder vesting in equal annual installments over the following three years. Vesting is subject to continued service through each applicable vesting date.

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

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Available on EDGAR 10/05/2026 - 04:06 PM Accepted by SEC EDGAR 10/05/2026 - 04:05 PM

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^*

WEAVER GREGORY L

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock, par value $0.0001	10/01/2026		M		14,475	A	$0⁽¹⁾	54,306	D
Common Stock, par value $0.0001	10/01/2026		F⁽²⁾		4,379	D	$2.76	49,927	D

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Restricted Stock Units	⁽¹⁾	10/01/2026		M			14,475	⁽³⁾	⁽³⁾	Common Stock, par value $0.0001	14,475	$0	43,425	D

Explanation of Responses:

1. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of Common Stock, par value $0.0001, when vested.

2. Vesting transaction: Shares surrendered to the Issuer solely to cover taxes associated with vesting of RSUs.

3. The RSUs become vested over four (4) years with 25% of the shares vesting on October 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.

	/s/ Gregory Weaver	10/05/2026
	** 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)

Source: View Original Filing on SEC EDGAR