March 6, 2026 · Form 4 insider transaction
Zhou Rong sold 1,357 shares of Amphastar Pharmaceuticals Inc at $19.34 per share, a transaction worth $26.2K. 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.