Jack Y. Zhang - Jun 13, 2025 Form 4 Insider Report for Amphastar Pharmaceuticals, Inc. (AMPH)

Role
CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner
Signature
/s/ Eva Wen, by power of attorney for Jack Y. Zhang
Stock symbol
AMPH
Transactions as of
Jun 13, 2025
Transactions value $
$2,606,000
Form type
4
Date filed
6/16/2025, 05:19 PM
Previous filing
Mar 18, 2025
SEC
View on sec.gov

Reporting Owners (2)

Name Relationship Address Signature Signature date CIK
Zhang Jack Y. CEO & CHIEF SCIENTIFIC OFFICER, Director, 10%+ Owner C/O AMPHASTAR PHARMACEUTICALS, INC., 11570 6TH STREET, RANCHO CUCAMONGA /s/ Eva Wen, by power of attorney for Jack Y. Zhang 2025-06-16 0001611157
Luo Mary Z. COO, Chief Scientist, Chairman, Director, 10%+ Owner C/O AMPHASTAR PHARMACEUTICALS, INC., 11570 6TH STREET, RANCHO CUCAMONGA /s/ Eva Wen, by power of attorney for Mary Z. Luo 2025-06-16 0001611156

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMPH Common Stock Options Exercise $2.61M +200K +7.55% $13.03 2.85M Jun 13, 2025 Direct
holding AMPH Common Stock 1.19M Jun 13, 2025 See footnote F1
holding AMPH Common Stock 6.83M Jun 13, 2025 See footnote F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction AMPH Employee Stock Option (right to buy) Options Exercise $0 -200K -49.38% $0.00 205K Jun 13, 2025 Common Stock 200K $13.03 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife.
F2 The shares are held of record by Applied Physics and Chemistry Laboratories, Inc., of which the reporting persons and The Bill Luobei Zhang 2004 Irrevocable Trust are the sole owners.
F3 Shares subject to the option are fully vested and immediately exercisable.