Amphastar Pharma Ownership & Insider Activity

Amphastar Pharma (AMPH) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 3.2% of shares outstanding. Institutional investors hold 54.0%. Over the past 90 days, insiders made 4 sales worth $425K.

Shares Outstanding

42.538M

Shares Float

19.517M

Insider Shares Owned

1.363M

Insider % Owned

3.2%

Institutional Shares Held

22.952M

Institutional % Held

54.0%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$425K total

Net Activity

Net Selling

Net Value (90d)

-$425K

Amphastar Pharma Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Sep 21, 2026	William J Peters	CFO, EVP & TREASURER	SELL	4.139K	$25.00	$103K
Sep 16, 2026	Rong Zhou	SENIOR EVP, PRODUCTION CENTER	SELL-OPTIONS	—	$18.65	$106K
Sep 2, 2026	Rong Zhou	SENIOR EVP, PRODUCTION CENTER	SELL	3.187K	$23.63	$75K
Aug 11, 2026	RICHARD PRINS	—	SELL	7.973K	$20.30	$162K
Aug 7, 2026	William J Peters	CFO, EVP & TREASURER	SELL	3.127K	$21.13	$84K