Amphastar Pharmaceuticals, Inc. 4

CFO, EVP & Treasurer William J. Peters of Amphastar Pharmaceuticals, Inc. exercised 5,053 stock options at $19.79 and sold 8,180 common shares at $22.48 on August 7, 2026 under a Rule 10b5-1 plan.

On August 7, 2026, Amphastar Pharmaceuticals, Inc. CFO, EVP & Treasurer William J. Peters exercised an employee stock option to acquire 5,053 shares of common stock at $19.79 per share and immediately sold 8,180 shares of common stock at $22.48 per share under a pre-established Rule 10b5-1 trading plan. The option exercise, for an implied cost of approximately $100,000, corresponded to a fully vested and immediately exercisable grant, while the sale generated proceeds of roughly $184,000. Following these transactions, Peters reported direct ownership of 172,846 shares of Amphastar common stock, which, using the sale price as a proxy, represents an equity stake valued at about $3.9 million. The filing also notes that his holdings include 910 shares acquired earlier under the company’s 2014 Employee Stock Purchase Plan, indicating ongoing participation in equity compensation and purchase programs.

Filing Facts

CIK

1297184

Ticker

AMPH

Form

4

Source Type

fda

Accession

0001263136-26-000012

Alert Tier

6