SEC Filing Summary

Zhou Rong, Senior EVP, Production Center at Amphastar Pharmaceuticals, Inc., reported a disposition of 1225 shares of Common Stock on March 15, 2026. The shares were withheld to cover tax liabilities related to restricted stock units. Following this transaction, Mr. Rong has indirect ownership of 99,668 shares held via the Zhou Family Trust and 5,000 shares held by his spouse. The total post-transaction shares owned are 171,554. The transaction code was "F" and the price per share was $18.18.