Investor Zhang Jack Y.
13D/G Filings

This page shows a list of all the recent 13D/G filings made by Zhang Jack Y. . Schedule 13D is commonly referred to as a “beneficial ownership report.” The term "beneficial owner" is defined under SEC rules. It includes any person who directly or indirectly shares voting power or investment power (the power to sell the security).

When a person or group of persons acquires beneficial ownership of more than 5% of a voting class of a company’s equity securities, they are required to file a Schedule 13D within ten days after the purchase. Click the link icon to see the full transaction history.

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Date Form Target Prev
Shares		 Current
Shares		 Change
(Percent)		 Ownership
(Percent)		 Change
(Percent)
2025-02-07 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 13,435,210 12,524,153
2024-02-09 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 13,110,695 13,435,210
2023-01-27 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 12,832,535 13,110,695
2022-02-11 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 12,487,779 12,832,535
2021-02-12 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 12,997,687 12,487,779
2020-02-14 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 13,352,336 12,997,687
2019-02-13 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 12,871,416 13,352,336
2018-02-09 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 12,894,921 12,871,416
2017-02-13 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 12,894,921
2017-02-10 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 11,733,188
2016-02-16 13G/A AMPH / Amphastar Pharmaceuticals, Inc. 11,733,188
2015-02-12 13G AMPH / Amphastar Pharmaceuticals, Inc. 11,123,022