William J Peters sold $184K of AMPH stock

William J Peters, CFO, EVP & Treasurer of Amphastar Pharmaceuticals, Inc. (AMPH), sold 8,180 shares of AMPH stock worth $184K, per an SEC Form 4 filed Aug 11, 2026.

The sale was pre-arranged (a 10b5-1 plan or an option exercise), not a fresh decision.

The trade happened on Aug 7, 2026, 4 days before it was made public.

AMPH has moved +41.4% since the trade date, from $20.78 to $29.38 (Nov 9, 2026 close).