Jack Y. Zhang

Insider Reports History

Location
Rancho Cucamonga, CA
Signature
/s/ Eva Wen, by power of attorney for Jack Y. Zhang
All insider transactions
Transactions in reports broken out by “transaction date” reported in original SEC filing, see here for transactions aggregated across transaction date

Holdings reported by Jack Y. Zhang:

Company Role Class Num Shares Value Price $ Report Date Ownership
Amphastar Pharmaceuticals, Inc. CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner Common Stock 6,827,679 $164,615,340 $24.11 13 Jun 2025 Indirect
Amphastar Pharmaceuticals, Inc. CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner Common Stock 2,847,659 $37,104,996 $13.03 13 Jun 2025 Direct
Amphastar Pharmaceuticals, Inc. CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner Employee Stock Option (right to buy) 205,003 13 Jun 2025 Direct
Amphastar Pharmaceuticals, Inc. CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner Employee Stock Option (right to buy) 0 14 Mar 2025 Indirect

Insider Reports Filed by Jack Y. Zhang

Symbol Company Period Transactions Value $ Form Type Role Filing Time
AMPH Amphastar Pharmaceuticals, Inc. 13 Jun 2025 2 +$2,606,000 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 16 Jun 2025, 17:19
AMPH Amphastar Pharmaceuticals, Inc. 14 Mar 2025 10 -$4,016,607 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 18 Mar 2025, 19:13
AMPH Amphastar Pharmaceuticals, Inc. 10 Mar 2025 4 $0 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 12 Mar 2025, 16:03
AMPH Amphastar Pharmaceuticals, Inc. 06 Mar 2025 2 -$360,060 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 10 Mar 2025, 16:04
AMPH Amphastar Pharmaceuticals, Inc. 04 Mar 2025 2 -$225,904 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 06 Mar 2025, 16:16
AMPH Amphastar Pharmaceuticals, Inc. 11 Nov 2024 2 $0 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 12 Nov 2024, 20:05
AMPH Amphastar Pharmaceuticals, Inc. 13 Sep 2024 2 +$1,469,000 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 16 Sep 2024, 19:09
AMPH Amphastar Pharmaceuticals, Inc. 10 Jun 2024 2 +$1,469,000 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 11 Jun 2024, 18:35
AMPH Amphastar Pharmaceuticals, Inc. 15 Mar 2024 8 -$14,431,386 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 19 Mar 2024, 18:55
AMPH Amphastar Pharmaceuticals, Inc. 06 Mar 2024 2 -$464,073 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 08 Mar 2024, 16:32
AMPH Amphastar Pharmaceuticals, Inc. 04 Mar 2024 4 $0 4 CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner 06 Mar 2024, 18:29
AMPH Amphastar Pharmaceuticals, Inc. 16 Mar 2023 6 -$2,153,124 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 20 Mar 2023, 20:02
AMPH Amphastar Pharmaceuticals, Inc. 15 Mar 2023 2 -$413,971 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 17 Mar 2023, 19:01
AMPH Amphastar Pharmaceuticals, Inc. 06 Mar 2023 4 $0 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 08 Mar 2023, 15:05
AMPH Amphastar Pharmaceuticals, Inc. 20 May 2022 1 -$364,365 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 23 May 2022, 16:05
AMPH Amphastar Pharmaceuticals, Inc. 18 May 2022 5 -$3,697,861 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 20 May 2022, 16:38
AMPH Amphastar Pharmaceuticals, Inc. 16 May 2022 4 -$4,234,897 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 18 May 2022, 16:06
AMPH Amphastar Pharmaceuticals, Inc. 16 Mar 2022 4 -$2,000,512 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 18 Mar 2022, 18:54
AMPH Amphastar Pharmaceuticals, Inc. 15 Mar 2022 6 -$678,993 4 CEO & Chief Scientific Officer, Director, 10%+ Owner 17 Mar 2022, 17:05