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

Filing Manager
Jack Y. Zhang
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
Filing time
07 Feb 2025, 19:21:18 UTC
Date of event
31 Dec 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