Zhang Jack Y. bought AMPH
March 9, 2026 · Form 4 insider transaction
Zhang Jack Y. bought 372,338 shares of Amphastar Pharmaceuticals, Inc. at $0.00 per share, a transaction worth N/A. The trade was recorded as grant or award and disclosed on an SEC Form 4, filed 2 days after the transaction.
Direction
Acquired (buy-side)
Shares
372,338
Price
$0.00
Total value
N/A
InsiderZhang Jack Y.
RoleDirector, 10% owner
SecurityEmployee Stock Option (right to buy)
Transaction codeA: Grant or award
Transaction dateMarch 9, 2026
Filing dateMarch 11, 2026
Shares owned after372,338
OwnershipDirect
10b5-1 planNo
AmendedNo
Footnotes
The shares subject to the option vest in four equal annual installments beginning on March 9, 2027.