March 4, 2026 · Form 4 insider transaction
Zhang Jack Y. sold 5,769 shares of Amphastar Pharmaceuticals Inc at $19.96 per share, a transaction worth $115.1K. The trade was recorded as shares withheld for taxes and disclosed on an SEC Form 4, filed 2 days after the transaction.
The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of restricted stock units, or RSUs.