Peters William J Insider Trades & Stock Holdings

CFO, EVP & TREASURER · Amphastar Pharmaceuticals, Inc. · Latest filing Sep 21, 2026

Peters William J, CFO, EVP & TREASURER at Amphastar Pharmaceuticals, Inc. has 1 Form 4 trade on file since Sep 21, 2026. Open-market activity: 0 purchases ($0) and 1 sale ($103.47K), net -$103.47K. Latest filing: disposed of 4.14K shares of $AMPH on Sep 21, 2026 at $25.

Trades on file

1

Open-market bought

$0

Open-market sold

$103.47K

Net open-market

-$103.47K

Latest filing

Sep 21, 2026

All insider trades by Peters William J

Date	Ticker	Type	Shares	Price	Value	Owned after	ΔOwn	1W	1M	6M	Role	Filing	Story
Sep 21, 2026	$AMPH	Sell (Open-market sale) 10b5-1	4.14K	$25	$103.47K			+11.9%			CFO, EVP & TREASURER		—

"Buy" means shares acquired on the Form 4 (including grants and option exercises); "Sell" means shares disposed. 1W / 1M / 6M = how the stock moved after the trade.

Stocks Peters William J traded

• $AMPH

Frequently asked questions

Has Peters William J been buying or selling stock?

Peters William J has 0 open-market purchases and 1 open-market sale on file, net -$103.47K. Grants, option exercises and tax withholding are listed separately because they are not open-market trades.

What was Peters William J's latest insider trade?

disposed of 4.14K shares of $AMPH on Sep 21, 2026 at $25.

Data comes from public SEC Form 4 and 13F filings and STOCK Act disclosures. Dates are the trade or filing date reported. This page is for research only and is not investment advice.