March 6, 2026 · Form 4 insider transaction
Zhang Jack Y. sold 7,773 shares of Amphastar Pharmaceuticals Inc at $19.34 per share, a transaction worth $150.3K. The trade was recorded as shares withheld for taxes and disclosed on an SEC Form 4, filed 4 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.