Jack Y. Zhang - 04 Mar 2026 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
Issuer symbol
AMPH
Transactions as of
04 Mar 2026
Net transactions value
$0
Form type
4
Filing time
06 Mar 2026, 21:58:54 UTC
Previous filing
16 Jun 2025
Next filing
10 Mar 2026
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 06 Mar 2026 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 06 Mar 2026 0001611156

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMPH Common Stock Tax liability -5,769 -0.2% $19.96* 2,841,890 04 Mar 2026 Direct F1
transaction AMPH Common Stock Tax liability -2,432 -0.21% $19.96* 1,183,043 04 Mar 2026 See footnote F1, F2
holding AMPH Common Stock 6,827,679 04 Mar 2026 See footnote F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of restricted stock units, or RSUs.
F2 The securities are held of record by Mary Z. Luo. The reporting persons are husband and wife.
F3 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.