ROBERTS M SCOT (Chief Scientific Officer) received a stock award from ALTIMMUNE, INC.

Compensation award — not an open‑market transaction. Less informative as a directional signal.

A · 1 award

ROBERTS M SCOT

Filed: 2/3/2026ACC: 0001705905-26-000006

InsiderROBERTS M SCOTCIK 1705905

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IssuerALTIMMUNE, INC.CIK 1326190

Officer· Chief Scientific Officer

Since Feb 2026

+379.00

Net shares

Net buyer

$28.9K

Total sold

Open market trades

0B · 0S

Total transactions

22.62K acquired · 22.24K disposed

Non-Derivative Transactions5

Common Stock, par value $0.0001

Direct

M · Option Exercise

+9.28K

Price / share

—

Trade value

—

% of position

9.7%

1/30/2026

95.39K→104.67K

Common Stock, par value $0.0001

Direct

F · Tax Withholding

−2.86K

Price / share

$5.60

Trade value

$16.01K

% of position

2.7%

1/30/2026

104.67K→101.81K

Common Stock, par value $0.0001

Direct

A · Award

+5.57K

Price / share

$3.07

Trade value

$17.09K

% of position

5.5%

1/31/2026

101.81K→107.38K

Common Stock, par value $0.0001

Direct

M · Option Exercise

+7.78K

Price / share

—

Trade value

—

% of position

7.2%

2/2/2026

107.38K→115.15K

Common Stock, par value $0.0001

Direct

F · Tax Withholding

−2.33K

Price / share

$5.55

Trade value

$12.93K

% of position

2.0%

2/2/2026

115.15K→112.82K

Total

Net shares

+17.43K

Net value

-$11.85K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock, par value $0.0001 Direct	1/30/2026	M · Option Exercise	+9.28K	—	—	9.7%	95.39K	104.67K
Common Stock, par value $0.0001 Direct	1/30/2026	F · Tax Withholding	−2.86K	$5.60	$16.01K	2.7%	104.67K	101.81K
Common Stock, par value $0.0001 Direct	1/31/2026	A · Award	+5.57K	$3.07	$17.09K	5.5%	101.81K	107.38K
Common Stock, par value $0.0001 Direct	2/2/2026	M · Option Exercise	+7.78K	—	—	7.2%	107.38K	115.15K
Common Stock, par value $0.0001 Direct	2/2/2026	F · Tax Withholding	−2.33K	$5.55	$12.93K	2.0%	115.15K	112.82K
Total			+17.43K		-$11.85K

Derivative Transactions2

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock, par value $0.0001

9.28K shares

−9.28K

Strike price

Held after

9.28K

Exercisable

—

1/30/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock, par value $0.0001

7.78K shares

−7.78K

Strike price

Held after

0.00

Exercisable

—

2/2/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Units Direct	Common Stock, par value $0.00019.28K shares	1/30/2026	M · Option Exercise	−9.28K		—	9.28K
Restricted Stock Units Direct	Common Stock, par value $0.00017.78K shares	2/2/2026	M · Option Exercise	−7.78K		—	0.00