Key facts
- This page summarizes Floyd F. Petersen's Form 4 filing for Amphastar Pharmaceuticals, Inc. (AMPH).
- 3 reported transactions and 1 derivative row are listed below.
- Accepted by SEC: 17 Nov 2025, 16:16.
Floyd F. Petersen - 13 Nov 2025 Form 4 Insider Report for Amphastar Pharmaceuticals, Inc. (AMPH)
- Reporting relationship
- Director
- Issuer ticker
- AMPH
- Reported as of
- 13 Nov 2025
- Net transaction value
- -$163,464
- SEC form
- 4
- Accepted by SEC
- 17 Nov 2025, 16:16:33 UTC
- Prior SEC filing
- 05 Nov 2025
- Next SEC filing
- 15 Dec 2025
- Source filing
- View source filing
- Reporting owner signature
- /s/ Eva Wen, by power of attorney
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Floyd F. Petersen filed Form 4 for Amphastar Pharmaceuticals, Inc. (AMPH) on 17 Nov 2025.
Change
- Previous filing in this sequence was filed on 05 Nov 2025.
- Current net transaction value: -$163,464.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
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
- 17 Nov 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
AMPH
transaction
Common Stock
Options Exercise
- Transaction value
- $278,373
- Shares
- +16,679
- Change %
- +22%
- Price
- $16.69
- Shares after
- 92,210
- Date
- 13 Nov 2025
- Ownership
- Direct
AMPH
transaction
Common Stock
Sale
- Transaction value
- $441,837
- Shares
- -16,679
- Change %
- -18%
- Price
- $26.49
- Shares after
- 75,531
- Date
- 13 Nov 2025
- Ownership
- Direct
- Footnotes
- F1
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
AMPH
transaction
Derivative
Stock Option (right to buy)
Options Exercise
- Transaction value
- $0
- Shares
- -16,679
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 13 Nov 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 16,679
- Exercise price
- $16.69
- Footnotes
- F2
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 2 footnotes
Footnote F1
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.43 to $26.57, 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.
Footnote F2
Shares subject to the option are fully vested and immediately exercisable.