Amphastar Pharmaceuticals, Inc. SEC filings AMPH
Amphastar Pharmaceuticals, Inc. has 954 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 Aug 6, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 6, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| 8-K |
Current report
Officer or director change
|
Jul 13, 2026 | Jul 9, 2026 |
| 8-K |
Current report
Other events
|
Jul 8, 2026 | Jul 2, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 3, 2026 | Jun 1, 2026 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 2026 |
| ARS | Annual report to shareholders | Apr 13, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 13, 2026 | — |
| DEF 14A | Proxy statement | Apr 13, 2026 | Jun 1, 2026 |
| 8-K |
Current report
Other events
|
Mar 16, 2026 | Mar 12, 2026 |
| 8-K |
Current report
Officer or director change
|
Mar 6, 2026 | Mar 3, 2026 |
| 8-K |
Current report
Material agreement
|
Mar 6, 2026 | Mar 3, 2026 |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 26, 2026 | Feb 26, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jan 12, 2026 | Jan 6, 2026 |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2025 | Nov 6, 2025 |
| 8-K |
Current report
Material agreement
|
Oct 24, 2025 | Oct 21, 2025 |
| 8-K |
Current report
Material agreement
|
Sep 18, 2025 | Sep 15, 2025 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Aug 12, 2025 | Aug 8, 2025 |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2025 | Aug 7, 2025 |
| 8-K |
Current report
Officer or director change
|
Jul 21, 2025 | Jul 18, 2025 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 4, 2025 | Jun 2, 2025 |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 7, 2025 | May 7, 2025 |
| ARS | Annual report to shareholders | Apr 14, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 14, 2025 | — |
| DEF 14A | Proxy statement | Apr 14, 2025 | Jun 2, 2025 |
| PRE 14A | Preliminary proxy statement | Apr 2, 2025 | Jun 2, 2025 |
| 10-K | Annual report | Mar 3, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2025 | Feb 27, 2025 |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2024 | Nov 6, 2024 |
| 8-K |
Current report
Material agreement
|
Aug 30, 2024 | Aug 28, 2024 |
| 10-Q | Quarterly report | Aug 9, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2024 | Aug 7, 2024 |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Other events
|
Jun 4, 2024 | Jun 3, 2024 |
| 10-Q | Quarterly report | May 10, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 8, 2024 | May 8, 2024 |
| DEFA14A | Additional proxy material | Apr 19, 2024 | — |
| ARS | Annual report to shareholders | Apr 12, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 12, 2024 | — |
| DEF 14A | Proxy statement | Apr 12, 2024 | Jun 3, 2024 |
| S-8 | Employee stock plan registration | Feb 29, 2024 | — |
| 10-K | Annual report | Feb 29, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 28, 2024 | Feb 28, 2024 |
| 10-Q | Quarterly report | Nov 8, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2023 | Nov 8, 2023 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Other events
|
Sep 15, 2023 | Sep 11, 2023 |
| 8-K/A | Amended current report | Aug 16, 2023 | Jun 30, 2023 |
| 10-Q | Quarterly report | Aug 9, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2023 | Aug 8, 2023 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, New debt, Other events
|
Jun 30, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jun 6, 2023 | Jun 5, 2023 |
| 10-Q | Quarterly report | May 9, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 9, 2023 | May 9, 2023 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
Apr 24, 2023 | Apr 21, 2023 |
| ARS | Annual report to shareholders | Apr 14, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Apr 14, 2023 | — |
| DEF 14A | Proxy statement | Apr 14, 2023 | — |
| 8-K |
Current report
Material agreement
|
Mar 10, 2023 | Mar 8, 2023 |
| S-8 | Employee stock plan registration | Mar 1, 2023 | — |
| 10-K | Annual report | Mar 1, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Feb 28, 2023 | Feb 28, 2023 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Feb 24, 2023 | Feb 23, 2023 |
| 8-K |
Current report
Material agreement
|
Nov 18, 2022 | Nov 15, 2022 |
| 10-Q | Quarterly report | Nov 8, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2022 | Nov 7, 2022 |
| 8-K |
Current report
Officer or director change
|
Aug 9, 2022 | Aug 4, 2022 |
| 10-Q | Quarterly report | Aug 9, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2022 | Aug 8, 2022 |
| 8-K |
Current report
Material agreement
|
Jul 8, 2022 | Jul 5, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 13, 2022 | Jun 10, 2022 |
| 10-Q | Quarterly report | May 10, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 9, 2022 | May 9, 2022 |
| 8-K |
Current report
Material agreement
|
Apr 22, 2022 | Apr 19, 2022 |
| DEFA14A | Additional proxy material | Apr 14, 2022 | — |
| DEF 14A | Proxy statement | Apr 14, 2022 | Jun 10, 2022 |
| S-8 | Employee stock plan registration | Mar 11, 2022 | — |
| 10-K | Annual report | Mar 11, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Mar 10, 2022 | Mar 10, 2022 |
| EFFECT | Filing | Nov 19, 2021 | — |
| CORRESP | Letter to the SEC | Nov 17, 2021 | — |
| UPLOAD | Letter from the SEC | Nov 15, 2021 | — |
| S-3 | Shelf registration | Nov 9, 2021 | — |
| 10-Q | Quarterly report | Nov 9, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2021 | Nov 8, 2021 |
| 8-K |
Current report
Officer or director change
|
Aug 23, 2021 | Aug 19, 2021 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Officer or director change
|
Aug 20, 2021 | Aug 19, 2021 |
| 8-K |
Current report
Officer or director change
|
Aug 10, 2021 | Aug 5, 2021 |
| 10-Q | Quarterly report | Aug 9, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2021 | Aug 9, 2021 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Aug 9, 2021 | Aug 4, 2021 |
| 8-K |
Current report
Shareholder vote results
|
Jun 8, 2021 | Jun 7, 2021 |
| DEFA14A | Additional proxy material | May 7, 2021 | — |
| 10-Q | Quarterly report | May 7, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Officer or director change, Regulation FD disclosure
|
May 7, 2021 | May 6, 2021 |
| 8-K |
Current report
Results of operations
|
May 6, 2021 | May 6, 2021 |
| DEFA14A | Additional proxy material | Apr 14, 2021 | — |
| DEF 14A | Proxy statement | Apr 14, 2021 | Jun 7, 2021 |
| S-8 | Employee stock plan registration | Mar 15, 2021 | — |
| 10-K | Annual report | Mar 15, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Mar 15, 2021 | Mar 15, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 12, 2021 | Jan 12, 2021 |
| 8-K |
Current report
Officer or director change, Other events
|
Nov 6, 2020 | Nov 3, 2020 |
| 10-Q | Quarterly report | Nov 6, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2020 | Nov 6, 2020 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Aug 10, 2020 | Jun 8, 2020 |
| 10-Q | Quarterly report | Aug 7, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2020 | Aug 6, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Jun 9, 2020 | Jun 8, 2020 |
| 10-Q | Quarterly report | May 11, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations
|
May 7, 2020 | May 7, 2020 |
| DEFA14A | Additional proxy material | Apr 15, 2020 | — |
| DEF 14A | Proxy statement | Apr 15, 2020 | Jun 8, 2020 |
| 8-K/A |
Amended current report
Officer or director change
|
Apr 14, 2020 | Apr 10, 2020 |
| 8-K |
Current report
Officer or director change
|
Apr 13, 2020 | Apr 13, 2020 |
| S-8 | Employee stock plan registration | Mar 16, 2020 | — |
| 10-K | Annual report | Mar 16, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations
|
Mar 12, 2020 | Mar 12, 2020 |
| 10-Q | Quarterly report | Nov 8, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2019 | Nov 7, 2019 |
| 10-Q | Quarterly report | Aug 9, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2019 | Aug 7, 2019 |
| 8-K |
Current report
Other events
|
Jun 19, 2019 | Jun 19, 2019 |
| 8-K |
Current report
Shareholder vote results
|
Jun 13, 2019 | Jun 12, 2019 |
| 10-Q | Quarterly report | May 10, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations
|
May 9, 2019 | May 9, 2019 |
| DEFA14A | Additional proxy material | Apr 18, 2019 | — |
| DEF 14A | Proxy statement | Apr 18, 2019 | Jun 12, 2019 |
| S-8 | Employee stock plan registration | Mar 15, 2019 | — |
| 10-K | Annual report | Mar 15, 2019 | Dec 31, 2018 |
| DEFA14A | Additional proxy material | Mar 15, 2019 | — |
| 8-K |
Current report
Officer or director change, Other events
|
Mar 14, 2019 | Mar 14, 2019 |
| 8-K |
Current report
Results of operations
|
Mar 12, 2019 | Mar 12, 2019 |
| EFFECT | Filing | Nov 20, 2018 | — |
| CORRESP | Letter to the SEC | Nov 16, 2018 | — |
| UPLOAD | Letter from the SEC | Nov 15, 2018 | — |
| S-3 | Shelf registration | Nov 9, 2018 | — |
| 10-Q | Quarterly report | Nov 9, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2018 | Nov 8, 2018 |
| 8-K |
Current report
Other events
|
Nov 8, 2018 | Nov 7, 2018 |
| 10-Q | Quarterly report | Aug 9, 2018 | Jun 30, 2018 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2018 | Aug 8, 2018 |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Other events
|
Jul 9, 2018 | Jul 2, 2018 |
| 8-K |
Current report
Shareholder vote results
|
Jun 8, 2018 | Jun 7, 2018 |
| 10-Q | Quarterly report | May 10, 2018 | Mar 31, 2018 |
| 8-K |
Current report
Results of operations
|
May 9, 2018 | May 9, 2018 |
| DEFA14A | Additional proxy material | Apr 18, 2018 | — |
| DEF 14A | Proxy statement | Apr 18, 2018 | Jun 7, 2018 |
| 8-K |
Current report
Other events
|
Mar 21, 2018 | Mar 21, 2018 |
| S-8 | Employee stock plan registration | Mar 14, 2018 | — |
| 10-K | Annual report | Mar 14, 2018 | Dec 31, 2017 |
| 8-K |
Current report
Results of operations
|
Mar 12, 2018 | Mar 12, 2018 |
| 10-Q | Quarterly report | Nov 9, 2017 | Sep 30, 2017 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2017 | Nov 8, 2017 |
| 10-Q | Quarterly report | Aug 9, 2017 | Jun 30, 2017 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2017 | Aug 9, 2017 |
| 8-K |
Current report
Other events
|
Jul 24, 2017 | Jul 24, 2017 |
| 8-K |
Current report
Shareholder vote results
|
Jun 9, 2017 | Jun 8, 2017 |
| 10-Q | Quarterly report | May 10, 2017 | Mar 31, 2017 |
| 8-K |
Current report
Results of operations
|
May 8, 2017 | May 8, 2017 |
| CT ORDER | Filing | Apr 26, 2017 | — |
| DEFA14A | Additional proxy material | Apr 21, 2017 | — |
| DEF 14A | Proxy statement | Apr 21, 2017 | Jun 8, 2017 |
| S-8 | Employee stock plan registration | Mar 15, 2017 | — |
| 10-K | Annual report | Mar 15, 2017 | Dec 31, 2016 |
| 8-K |
Current report
Results of operations
|
Mar 13, 2017 | Mar 13, 2017 |
| 8-K |
Current report
Other events
|
Dec 27, 2016 | Dec 27, 2016 |
| 8-K |
Current report
Material agreement, Other events
|
Nov 10, 2016 | Nov 9, 2016 |
| 10-Q | Quarterly report | Nov 9, 2016 | Sep 30, 2016 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2016 | Sep 30, 2016 |
| UPLOAD | Letter from the SEC | Nov 3, 2016 | — |
| CORRESP | Letter to the SEC | Oct 14, 2016 | — |
| UPLOAD | Letter from the SEC | Sep 27, 2016 | — |
| 10-Q | Quarterly report | Aug 9, 2016 | Jun 30, 2016 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2016 | Aug 8, 2016 |
| 8-K |
Current report
Other events
|
Aug 4, 2016 | Aug 1, 2016 |
| 8-K |
Current report
Material agreement, Agreement ended, Regulation FD disclosure
|
Jul 7, 2016 | Jun 30, 2016 |
| 8-K |
Current report
Shareholder vote results
|
Jun 10, 2016 | Jun 9, 2016 |
| 10-Q | Quarterly report | May 10, 2016 | Mar 31, 2016 |
| 8-K |
Current report
Results of operations
|
May 9, 2016 | May 9, 2016 |
| DEFA14A | Additional proxy material | Apr 22, 2016 | — |
| DEF 14A | Proxy statement | Apr 22, 2016 | Jun 9, 2016 |
| S-8 | Employee stock plan registration | Mar 15, 2016 | — |
| 10-K | Annual report | Mar 15, 2016 | Dec 31, 2015 |
| 8-K |
Current report
Results of operations
|
Mar 14, 2016 | Mar 14, 2016 |
| 10-Q | Quarterly report | Nov 13, 2015 | Sep 30, 2015 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2015 | Nov 12, 2015 |
| 10-Q | Quarterly report | Aug 13, 2015 | Jun 30, 2015 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2015 | Aug 12, 2015 |
| EFFECT | Filing | Jul 17, 2015 | — |
| CORRESP | Letter to the SEC | Jul 14, 2015 | — |
| UPLOAD | Letter from the SEC | Jul 10, 2015 | — |
| S-8 | Employee stock plan registration | Jul 2, 2015 | — |
| S-3 | Shelf registration | Jul 2, 2015 | — |
| 8-K |
Current report
Other events
|
Jun 22, 2015 | Jun 22, 2015 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 1, 2015 | May 27, 2015 |
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.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
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.