Jack Yongfeng Zhang

Activist investor & 5%+ owner · SC 13D/13G filings

Total Filings

2

Stocks Covered

1

Latest Filing

Jan 27, 2023

Filings

AMPH

AMPHASTAR PHARMACEUTICALS, INC.

SC 13G/A · Jan 27, 2023

25.5%

13.1M shares

AMPH

AMPHASTAR PHARMACEUTICALS, INC.

SC 13G/A · Feb 11, 2022

25.5%

12.8M shares