Floyd F. Petersen - 11 Dec 2025 Form 4 Insider Report for Amphastar Pharmaceuticals, Inc. (AMPH)

Reporting relationship: Director
Issuer ticker: AMPH
Reported as of: 11 Dec 2025
Net transaction value: -$107,508
SEC form: 4
Accepted by SEC: 15 Dec 2025, 17:17:42 UTC
Prior SEC filing: 17 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Eva Wen, by power of attorney

Key filing fact

Floyd F. Petersen filed Form 4 for Amphastar Pharmaceuticals, Inc. (AMPH) on 15 Dec 2025.

Key facts

This page summarizes Floyd F. Petersen's Form 4 filing for Amphastar Pharmaceuticals, Inc. (AMPH).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 15 Dec 2025, 17:17.

Change

Previous filing in this sequence was filed on 17 Nov 2025.
Current net transaction value: -$107,508.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001611286 Primary reporting owner

Petersen Floyd F.

Relationship: Director
Address: C/O AMPHASTAR PHARMACEUTICALS, INC., 11570 6TH STREET, RANCHO CUCAMONGA
Signature: /s/ Eva Wen, by power of attorney
Signature date: 15 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

AMPH transaction

Common Stock

Sale

Transaction value: $44,620
Shares: -1,737
Change %: -2.3%
Price: $25.69
Shares after: 73,794
Date: 11 Dec 2025
Ownership: Direct

AMPH transaction

Common Stock

Sale

Transaction value: $62,888
Shares: -2,426
Change %: -3.3%
Price: $25.92
Shares after: 71,368
Date: 12 Dec 2025
Ownership: Direct
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.9225 to $25.945, 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.