March 10, 2026 · Form 4 insider transaction
Zhang Jack Y. sold 14,785 shares of Amphastar Pharmaceuticals Inc at $18.91 per share, a transaction worth $279.6K. The trade was recorded as shares withheld for taxes and disclosed on an SEC Form 4, filed 1 day after the transaction.
The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs.