Jack Y. Zhang - Dec 31, 2024 Form SCHEDULE 13G/A Schedule Report for Amphastar Pharmaceuticals, Inc. (AMPH)

Filing Manager
Zhang Jack Y.
Reporting Manager
Jack Y. Zhang
Security
Amphastar Pharmaceuticals, Inc. Common Stock
Symbol
AMPH
Shares outstanding
50.5M shares
Disclosed Ownership
12.5M shares
Ownership
24.8%
Form type
SCHEDULE 13G/A
Date filed
2/7/2025, 07:21 PM
Date of event
Dec 31, 2024
SEC
View on sec.gov

Reporting Managers (3)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Jack Y. Zhang 24.8% 12.5M 3.9M 8.62M /s/ Jack Y. Zhang Jack Y. Zhang
Mary Z. Luo 24.8% 12.5M 1.8M 10.7M /s/ Mary Z. Luo Mary Z. Luo
Applied Physics & Chemistry Laboratories, Inc. 14.2% 6.83M 6.83M 0 /s/ Jack Y. Zhang Jack Y. Zhang, President