Amphastar Pharmaceuticals, Inc. SEC filings AMPH
Amphastar Pharmaceuticals, Inc. has 957 filings in SEC EDGAR's recent list, going back to Feb 11, 2005. Its latest annual report, Form ARS, was filed on Apr 13, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 5, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 144 | Notice of proposed sale | Nov 5, 2026 | — |
| 144 | Notice of proposed sale | Nov 4, 2026 | — |
| 4 | Insider transaction | Sep 23, 2026 | Sep 21, 2026 |
| 144 | Notice of proposed sale | Sep 21, 2026 | — |
| 4 | Insider transaction | Sep 17, 2026 | Sep 16, 2026 |
| 4 | Insider transaction | Sep 3, 2026 | Sep 2, 2026 |
| 144 | Notice of proposed sale | Sep 1, 2026 | — |
| 144 | Notice of proposed sale | Aug 18, 2026 | — |
| 4 | Insider transaction | Aug 12, 2026 | Aug 11, 2026 |
| 4 | Insider transaction | Aug 11, 2026 | Aug 7, 2026 |
| 144 | Notice of proposed sale | Aug 11, 2026 | — |
| 144 | Notice of proposed sale | Aug 7, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 14, 2026 | — |
| 4 | Insider transaction | Jul 13, 2026 | Jul 9, 2026 |
| 3 | Initial insider ownership | Jul 13, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Aug 19, 2024 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 17, 2026 | Mar 15, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 9, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 9, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 9, 2026 |
| 4 | Insider transaction | Mar 11, 2026 | Mar 9, 2026 |
| 4 | Insider transaction | Mar 10, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Mar 10, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Mar 10, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Mar 10, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Mar 6, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 6, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 6, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 6, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Dec 18, 2025 | Dec 17, 2025 |
| 4 | Insider transaction | Dec 15, 2025 | Dec 11, 2025 |
| 144 | Notice of proposed sale | Dec 11, 2025 | — |
| 144 | Notice of proposed sale | Dec 10, 2025 | — |
| 144 | Notice of proposed sale | Nov 28, 2025 | — |
| 4 | Insider transaction | Nov 25, 2025 | Nov 25, 2025 |
| 144 | Notice of proposed sale | Nov 25, 2025 | — |
| 4 | Insider transaction | Nov 17, 2025 | Nov 13, 2025 |
| 144 | Notice of proposed sale | Nov 13, 2025 | — |
| 4 | Insider transaction | Nov 5, 2025 | Nov 3, 2025 |
| 144 | Notice of proposed sale | Nov 3, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 17, 2025 | — |
| 4 | Insider transaction | Oct 2, 2025 | Oct 1, 2025 |
| 144 | Notice of proposed sale | Oct 1, 2025 | — |
| 4 | Insider transaction | Sep 3, 2025 | Sep 2, 2025 |
| 144 | Notice of proposed sale | Sep 2, 2025 | — |
| 4 | Insider transaction | Aug 4, 2025 | Aug 1, 2025 |
| 144 | Notice of proposed sale | Aug 1, 2025 | — |
| 4 | Insider transaction | Jul 22, 2025 | Jul 18, 2025 |
| 3 | Initial insider ownership | Jul 22, 2025 | Jul 18, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 2, 2025 |
| 144 | Notice of proposed sale | Jul 2, 2025 | — |
| 4 | Insider transaction | Jun 16, 2025 | Jun 13, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 4 | Insider transaction | Jun 4, 2025 | Jun 2, 2025 |
| 144 | Notice of proposed sale | Jun 2, 2025 | — |
| 4 | Insider transaction | May 20, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 2, 2025 | May 1, 2025 |
| 144 | Notice of proposed sale | May 1, 2025 | — |
| 4 | Insider transaction | Apr 2, 2025 | Apr 1, 2025 |
| 144 | Notice of proposed sale | Apr 1, 2025 | — |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 14, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 15, 2025 |
| 4 | Insider transaction | Mar 12, 2025 | Mar 10, 2025 |
| 4 | Insider transaction | Mar 12, 2025 | Mar 10, 2025 |
| 4 | Insider transaction | Mar 12, 2025 | Mar 10, 2025 |
| 4 | Insider transaction | Mar 12, 2025 | Mar 10, 2025 |
| 4 | Insider transaction | Mar 10, 2025 | Mar 6, 2025 |
| 4 | Insider transaction | Mar 10, 2025 | Mar 6, 2025 |
| 4 | Insider transaction | Mar 10, 2025 | Mar 6, 2025 |
| 4 | Insider transaction | Mar 10, 2025 | Mar 6, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 6, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 144 | Notice of proposed sale | Mar 6, 2025 | — |
| 144 | Notice of proposed sale | Mar 4, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 7, 2025 | — |
| 4 | Insider transaction | Dec 16, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Dec 11, 2024 | Dec 9, 2024 |
| 144 | Notice of proposed sale | Dec 9, 2024 | — |
| 4 | Insider transaction | Nov 13, 2024 | Nov 12, 2024 |
| 4 | Insider transaction | Nov 13, 2024 | Nov 12, 2024 |
| 4 | Insider transaction | Nov 12, 2024 | Nov 11, 2024 |
| 144 | Notice of proposed sale | Nov 12, 2024 | — |
| 144 | Notice of proposed sale | Nov 12, 2024 | — |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 144 | Notice of proposed sale | Nov 6, 2024 | — |
| 144 | Notice of proposed sale | Nov 6, 2024 | — |
| 4 | Insider transaction | Sep 17, 2024 | Sep 13, 2024 |
| 4 | Insider transaction | Sep 16, 2024 | Sep 13, 2024 |
| 4 | Insider transaction | Sep 6, 2024 | Sep 5, 2024 |
| 144 | Notice of proposed sale | Sep 5, 2024 | — |
| 4 | Insider transaction | Aug 27, 2024 | Aug 26, 2024 |
| 144 | Notice of proposed sale | Aug 26, 2024 | — |
| 4 | Insider transaction | Aug 13, 2024 | Aug 12, 2024 |
| 144 | Notice of proposed sale | Aug 12, 2024 | — |
| 4 | Insider transaction | Aug 2, 2024 | Jul 31, 2024 |
| 144 | Notice of proposed sale | Jul 31, 2024 | — |
| 4 | Insider transaction | Jun 28, 2024 | Jun 27, 2024 |
| 144 | Notice of proposed sale | Jun 27, 2024 | — |
| 4 | Insider transaction | Jun 11, 2024 | Jun 10, 2024 |
| 4 | Insider transaction | Jun 11, 2024 | Jun 10, 2024 |
| 144 | Notice of proposed sale | Jun 10, 2024 | — |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 4, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 4 | Insider transaction | Jun 5, 2024 | Jun 3, 2024 |
| 144 | Notice of proposed sale | Jun 3, 2024 | — |
| 4 | Insider transaction | May 21, 2024 | May 19, 2024 |
| 4 | Insider transaction | May 2, 2024 | May 1, 2024 |
| 144 | Notice of proposed sale | May 1, 2024 | — |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 144 | Notice of proposed sale | Apr 1, 2024 | — |
| 4 | Insider transaction | Mar 19, 2024 | Mar 15, 2024 |
| 4 | Insider transaction | Mar 19, 2024 | Mar 15, 2024 |
| 4 | Insider transaction | Mar 19, 2024 | Mar 15, 2024 |
| 4 | Insider transaction | Mar 19, 2024 | Mar 15, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 6, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 6, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 6, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 6, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 5, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Mar 4, 2024 |
| 144 | Notice of proposed sale | Mar 6, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Mar 6, 2024 | — |
| 144 | Notice of proposed sale | Mar 5, 2024 | — |
| 4 | Insider transaction | Mar 4, 2024 | Mar 1, 2024 |
| 144 | Notice of proposed sale | Mar 1, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| 4 | Insider transaction | Feb 2, 2024 | Feb 1, 2024 |
| 144 | Notice of proposed sale | Feb 1, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 23, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 17, 2024 | — |
| 4 | Insider transaction | Jan 11, 2024 | Jan 10, 2024 |
| 4 | Insider transaction | Jan 10, 2024 | Jan 8, 2024 |
| 144 | Notice of proposed sale | Jan 10, 2024 | — |
| 144 | Notice of proposed sale | Jan 9, 2024 | — |
| 144 | Notice of proposed sale | Jan 8, 2024 | — |
| 4 | Insider transaction | Jan 3, 2024 | Jan 2, 2024 |
| 144 | Notice of proposed sale | Jan 2, 2024 | — |
| 4 | Insider transaction | Dec 5, 2023 | Dec 1, 2023 |
| 4 | Insider transaction | Dec 4, 2023 | Dec 1, 2023 |
| 144 | Notice of proposed sale | Dec 1, 2023 | — |
| 4 | Insider transaction | Nov 20, 2023 | Nov 17, 2023 |
| 144 | Notice of proposed sale | Nov 17, 2023 | — |
| 4 | Insider transaction | Nov 16, 2023 | Nov 14, 2023 |
| 4 | Insider transaction | Nov 15, 2023 | Nov 13, 2023 |
| 4 | Insider transaction | Nov 15, 2023 | Nov 14, 2023 |
| 144 | Notice of proposed sale | Nov 14, 2023 | — |
| 144 | Notice of proposed sale | Nov 13, 2023 | — |
| 144 | Notice of proposed sale | Nov 13, 2023 | — |
| 4 | Insider transaction | Nov 2, 2023 | Nov 1, 2023 |
| 144 | Notice of proposed sale | Nov 1, 2023 | — |
| 4 | Insider transaction | Oct 3, 2023 | Oct 2, 2023 |
| 144 | Notice of proposed sale | Oct 2, 2023 | — |
| 4 | Insider transaction | Sep 8, 2023 | Sep 6, 2023 |
| 144 | Notice of proposed sale | Sep 6, 2023 | — |
| 4 | Insider transaction | Aug 29, 2023 | Aug 28, 2023 |
| 144 | Notice of proposed sale | Aug 28, 2023 | — |
| 4 | Insider transaction | Aug 21, 2023 | Aug 18, 2023 |
| 4 | Insider transaction | Aug 16, 2023 | Aug 15, 2023 |
| 4 | Insider transaction | Aug 16, 2023 | Aug 15, 2023 |
| 144 | Notice of proposed sale | Aug 15, 2023 | — |
| 144 | Notice of proposed sale | Aug 15, 2023 | — |
| 4 | Insider transaction | Jun 21, 2023 | Jun 20, 2023 |
| 4 | Insider transaction | Jun 20, 2023 | Jun 15, 2023 |
| 4 | Insider transaction | Jun 20, 2023 | Jun 15, 2023 |
| 144 | Notice of proposed sale | Jun 15, 2023 | — |
| 4 | Insider transaction | Jun 14, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 12, 2023 | Jun 10, 2023 |
| 4 | Insider transaction | Jun 7, 2023 | Jun 5, 2023 |
| 4 | Insider transaction | Jun 7, 2023 | Jun 5, 2023 |
| 4 | Insider transaction | Jun 7, 2023 | Jun 5, 2023 |
| 4 | Insider transaction | Jun 7, 2023 | Jun 5, 2023 |
| 4 | Insider transaction | Jun 7, 2023 | Jun 5, 2023 |
| 4 | Insider transaction | Jun 7, 2023 | Jun 5, 2023 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- AMPH (Nasdaq)
- Fiscal year ends
- December 31
- Headquarters
- Rancho Cucamonga, CA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1297184
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.