Rong Zhou - 09 Mar 2026 Form 4 Insider Report for Amphastar Pharmaceuticals, Inc. (AMPH)

Role
SENIOR EVP, PRODUCTION CENTER
Signature
/s/ Eva Wen, by power of attorney
Issuer symbol
AMPH
Transactions as of
09 Mar 2026
Net transactions value
$0
Form type
4
Filing time
11 Mar 2026, 20:15:55 UTC
Previous filing
10 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Zhou Rong SENIOR EVP, PRODUCTION CENTER C/O AMPHASTAR PHARMACEUTICALS, INC., 11570 6TH STREET, RANCHO CUCAMONGA /s/ Eva Wen, by power of attorney 11 Mar 2026 0001645326

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMPH Common Srock Award +39,432 +29% $0.000000* 174,994 09 Mar 2026 Direct F1
transaction AMPH Common Stock Tax liability -2,215 -1.3% $18.91* 172,779 10 Mar 2026 Direct F2
holding AMPH Common Stock 99,668 09 Mar 2026 See footnote F3
holding AMPH Common Stock 5,000 09 Mar 2026 See footnote F4

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) Award +81,341 $0.000000* 81,341 09 Mar 2026 Common Stock 81,341 $19.21 Direct F5
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The reported shares are represented by restricted stock units, or RSUs, which vest in four equal annual installments beginning on March 9, 2027.
F2 The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs.
F3 The shares are held of record by the Zhou Family Trust for which the reporting person serves as a trustee.
F4 The shares are held of record by the reporting person's spouse.
F5 The shares subject to the option vest in four equal annual installments beginning on March 9, 2027.