Altimmune Ownership & Insider Activity

Altimmune (ALT) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 2.9% of shares outstanding. Institutional investors hold 30.5%. Over the past 90 days, insiders made 1 purchase worth $44K.

Shares Outstanding

194.518M

Shares Float

194.279M

Insider Shares Owned

5.592M

Insider % Owned

2.9%

Institutional Shares Held

59.342M

Institutional % Held

30.5%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

$44K total

Sales (90d)

Net Activity

Net Buying

Net Value (90d)

$44K

Altimmune Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Aug 13, 2026	Benedict Jerome Durso	PRESIDENT AND CEO	BUY	15.000K	$2.95	$44K