Changes in Beneficial Ownership · 4
Amphastar Pharmaceuticals, Inc.
AMPHNASDAQEQUITYCurrent
Changes in Beneficial Ownership
Structured filing — 4
form4-09232026_100936.xml
Filing details
- Report period
- 2026-09-21
- Issuer
- Amphastar Pharmaceuticals, Inc.
- Issuer CIK
- 0001297184
- Trading symbol
- AMPH
- Rule 10b5-1 indication
- Checked
Reporting owner 1
- Name
- PETERS WILLIAM J
- Reporting owner CIK
- 0001263136
- Relationship
- Director · Officer
- Officer title
- CFO, EVP & TREASURER
- Address
- C/O AMPHASTAR PHARMACEUTICALS, INC., 11570 6TH STREET, RANCHO CUCAMONGA, CA, 91730
Non-derivative transactions
| Security | Transaction date | Code | Amount | A / D | Price (USD) | Owned after | Ownership |
|---|---|---|---|---|---|---|---|
| Common Stock | 2026-09-21 | S · Form 4[F1] | 4,139 | D | 25 | 168,707 | D |
Table key
- S · Form 4
- Sale on the market or privately
- D
- Direct
Footnotes
- F1
- The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 10, 2026.↩ 1
Signature 1
- Signed
- /s/ William J. Peters
- Date
- 2026-09-23
Company context
Amphastar is a biopharmaceutical company that focuses on developing, manufacturing, and commercializing technically challenging generic and proprietary injectable, inhalation, and intranasal products. Additionally, the Company sells active pharmaceutical ingredient, or API products. Most of the Company’s finished products are contracted and distributed through group purchasing organizations, drug wholesalers, and drug retailers. More information and resources are available at www.amphastar.com.