RICHARD K. PRINS - 25 Nov 2025 Form 4 Insider Report for Amphastar Pharmaceuticals, Inc. (AMPH)

Role
Director
Signature
/s/ Eva Wen, by power of attorney
Issuer symbol
AMPH
Transactions as of
25 Nov 2025
Net transactions value
-$43,506
Form type
4
Filing time
25 Nov 2025, 19:38:45 UTC
Previous filing
22 Oct 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
PRINS RICHARD K Director C/O AMPHASTAR PHARMACEUTICALS, INC., 11570 6TH STREET, RANCHO CUCAMONGA /s/ Eva Wen, by power of attorney 25 Nov 2025 0001047579

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction AMPH Common Stock Options Exercise $69,748 +4,179 +12% $16.69 39,362 25 Nov 2025 Direct
transaction AMPH Common Stock Sale $113,253 -4,179 -11% $27.10 35,183 25 Nov 2025 Direct F1

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 Stock Option (right to buy) Options Exercise $0 -4,179 -100% $0.000000 0 25 Nov 2025 Common Stock 4,179 $16.69 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.10 to $27.125, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.
F2 Shares subject to the option are fully vested and immediately exercisable.