Amprius Technologies, Inc. SEC filings AMPX
Amprius Technologies, Inc. has 501 filings in SEC EDGAR's recent list, going back to Dec 15, 2021. Its latest annual report, Form ARS, was filed on Apr 29, 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 Sep 28, 2026 (material agreement). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Aug 25, 2026 | Aug 21, 2026 |
| 144 | Notice of proposed sale | Aug 25, 2026 | — |
| 4 | Insider transaction | Aug 25, 2026 | Aug 21, 2026 |
| 144 | Notice of proposed sale | Aug 25, 2026 | — |
| 4 | Insider transaction | Aug 25, 2026 | Aug 21, 2026 |
| 144 | Notice of proposed sale | Aug 25, 2026 | — |
| 144 | Notice of proposed sale | Aug 24, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 10, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 27, 2026 | — |
| 4 | Insider transaction | Jun 16, 2026 | Jun 12, 2026 |
| 4 | Insider transaction | Jun 16, 2026 | Jun 12, 2026 |
| 4 | Insider transaction | Jun 16, 2026 | Jun 12, 2026 |
| 4 | Insider transaction | Jun 16, 2026 | Jun 12, 2026 |
| 4 | Insider transaction | Jun 11, 2026 | Jun 9, 2026 |
| 144 | Notice of proposed sale | Jun 8, 2026 | — |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 144 | Notice of proposed sale | Jun 4, 2026 | — |
| 4 | Insider transaction | May 28, 2026 | May 27, 2026 |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 4 | Insider transaction | May 28, 2026 | May 27, 2026 |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 4 | Insider transaction | May 28, 2026 | May 27, 2026 |
| 144 | Notice of proposed sale | May 28, 2026 | — |
| 4 | Insider transaction | May 28, 2026 | May 26, 2026 |
| 4 | Insider transaction | May 26, 2026 | May 21, 2026 |
| 144 | Notice of proposed sale | May 26, 2026 | — |
| 4 | Insider transaction | May 26, 2026 | May 21, 2026 |
| 144 | Notice of proposed sale | May 26, 2026 | — |
| 4 | Insider transaction | May 26, 2026 | May 21, 2026 |
| 144 | Notice of proposed sale | May 26, 2026 | — |
| 144 | Notice of proposed sale | May 26, 2026 | — |
| 4/A | Form 4/a | May 7, 2026 | Dec 19, 2025 |
| 4 | Insider transaction | May 7, 2026 | May 5, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 28, 2026 | — |
| 4 | Insider transaction | Apr 2, 2026 | Apr 1, 2026 |
| 144 | Notice of proposed sale | Apr 1, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 24, 2026 | Mar 23, 2026 |
| 144 | Notice of proposed sale | Mar 23, 2026 | — |
| 4/A | Form 4/a | Mar 13, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 13, 2026 | Mar 12, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 144 | Notice of proposed sale | Mar 12, 2026 | — |
| 144 | Notice of proposed sale | Mar 12, 2026 | — |
| 144 | Notice of proposed sale | Mar 10, 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 | Feb 24, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 24, 2026 | Feb 23, 2026 |
| 144 | Notice of proposed sale | Feb 24, 2026 | — |
| 144 | Notice of proposed sale | Feb 24, 2026 | — |
| 4 | Insider transaction | Jan 30, 2026 | Jan 28, 2026 |
| 4 | Insider transaction | Jan 23, 2026 | Jan 21, 2026 |
| 144 | Notice of proposed sale | Jan 21, 2026 | — |
| 4 | Insider transaction | Jan 20, 2026 | Jan 16, 2026 |
| 144 | Notice of proposed sale | Jan 16, 2026 | — |
| 4 | Insider transaction | Jan 14, 2026 | Jan 12, 2026 |
| 144 | Notice of proposed sale | Jan 12, 2026 | — |
| 4 | Insider transaction | Dec 22, 2025 | Dec 19, 2025 |
| 4 | Insider transaction | Dec 15, 2025 | Dec 11, 2025 |
| 144 | Notice of proposed sale | Dec 11, 2025 | — |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 144 | Notice of proposed sale | Nov 25, 2025 | — |
| 144 | Notice of proposed sale | Nov 25, 2025 | — |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 30, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 17, 2025 | — |
| 4 | Insider transaction | Oct 8, 2025 | Oct 6, 2025 |
| 3 | Initial insider ownership | Oct 8, 2025 | Oct 6, 2025 |
| 4 | Insider transaction | Aug 25, 2025 | Aug 21, 2025 |
| 4 | Insider transaction | Aug 25, 2025 | Aug 21, 2025 |
| 4 | Insider transaction | Aug 25, 2025 | Aug 21, 2025 |
| 144 | Notice of proposed sale | Aug 25, 2025 | — |
| 144 | Notice of proposed sale | Aug 25, 2025 | — |
| 144 | Notice of proposed sale | Aug 25, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 6, 2025 | — |
| 4 | Insider transaction | Jun 17, 2025 | Jun 13, 2025 |
| 4 | Insider transaction | Jun 17, 2025 | Jun 13, 2025 |
| 4 | Insider transaction | Jun 17, 2025 | Jun 13, 2025 |
| 4 | Insider transaction | Jun 17, 2025 | Jun 13, 2025 |
| 4 | Insider transaction | Jun 17, 2025 | Jun 13, 2025 |
| 4 | Insider transaction | May 23, 2025 | May 21, 2025 |
| 4 | Insider transaction | May 23, 2025 | May 21, 2025 |
| 4 | Insider transaction | May 23, 2025 | May 21, 2025 |
| 144 | Notice of proposed sale | May 23, 2025 | — |
| 144 | Notice of proposed sale | May 23, 2025 | — |
| 144 | Notice of proposed sale | May 23, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 3/A | Form 3/a | May 12, 2025 | May 1, 2025 |
| 4 | Insider transaction | May 6, 2025 | May 1, 2025 |
| 3 | Initial insider ownership | May 6, 2025 | May 1, 2025 |
| 4 | Insider transaction | Mar 21, 2025 | Mar 19, 2025 |
| 4 | Insider transaction | Mar 21, 2025 | Mar 19, 2025 |
| 4 | Insider transaction | Mar 21, 2025 | Mar 19, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 14, 2025 |
| 4 | Insider transaction | Mar 12, 2025 | Mar 10, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| 4 | Insider transaction | Feb 24, 2025 | Feb 21, 2025 |
| 144 | Notice of proposed sale | Feb 24, 2025 | — |
| 144 | Notice of proposed sale | Feb 24, 2025 | — |
| 144 | Notice of proposed sale | Feb 24, 2025 | — |
| 144 | Notice of proposed sale | Feb 24, 2025 | — |
| 4 | Insider transaction | Nov 22, 2024 | Nov 21, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 20, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 21, 2024 |
| 4 | Insider transaction | Nov 22, 2024 | Nov 21, 2024 |
| 144 | Notice of proposed sale | Nov 21, 2024 | — |
| 144 | Notice of proposed sale | Nov 21, 2024 | — |
| 144 | Notice of proposed sale | Nov 21, 2024 | — |
| 144 | Notice of proposed sale | Nov 21, 2024 | — |
| 144 | Notice of proposed sale | Nov 21, 2024 | — |
| 144 | Notice of proposed sale | Nov 20, 2024 | — |
| 144 | Notice of proposed sale | Nov 12, 2024 | — |
| 144 | Notice of proposed sale | Nov 8, 2024 | — |
| 144 | Notice of proposed sale | Nov 7, 2024 | — |
| SC 13D | Ownership over 5% (active) | Oct 28, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Oct 28, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Oct 25, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Oct 25, 2024 | — |
| SC 13D | Ownership over 5% (active) | Oct 25, 2024 | — |
| 4 | Insider transaction | Oct 25, 2024 | Oct 23, 2024 |
| 4 | Insider transaction | Oct 25, 2024 | Oct 23, 2024 |
| 4 | Insider transaction | Oct 25, 2024 | Oct 23, 2024 |
| 4 | Insider transaction | Oct 25, 2024 | Oct 23, 2024 |
| 4 | Insider transaction | Oct 25, 2024 | Oct 23, 2024 |
| 144 | Notice of proposed sale | Oct 25, 2024 | — |
| 4 | Insider transaction | Sep 5, 2024 | Sep 3, 2024 |
| 4 | Insider transaction | Sep 5, 2024 | Sep 3, 2024 |
| 144 | Notice of proposed sale | Sep 4, 2024 | — |
| 144 | Notice of proposed sale | Sep 3, 2024 | — |
| 4 | Insider transaction | Aug 22, 2024 | Aug 21, 2024 |
| 4 | Insider transaction | Aug 22, 2024 | Aug 21, 2024 |
| 4 | Insider transaction | Aug 22, 2024 | Aug 21, 2024 |
| 4 | Insider transaction | Aug 22, 2024 | Aug 21, 2024 |
| 144 | Notice of proposed sale | Aug 22, 2024 | — |
| 144 | Notice of proposed sale | Aug 22, 2024 | — |
| 144 | Notice of proposed sale | Aug 22, 2024 | — |
| 144 | Notice of proposed sale | Aug 22, 2024 | — |
| 4 | Insider transaction | Aug 14, 2024 | Aug 13, 2024 |
| 3 | Initial insider ownership | Aug 14, 2024 | Aug 13, 2024 |
| 4 | Insider transaction | Jul 25, 2024 | Jul 23, 2024 |
| 4 | Insider transaction | Jun 14, 2024 | Jun 12, 2024 |
| 144 | Notice of proposed sale | Jun 12, 2024 | — |
| 4 | Insider transaction | Jun 7, 2024 | Jun 7, 2024 |
| 4 | Insider transaction | Jun 7, 2024 | Jun 7, 2024 |
| 4 | Insider transaction | Jun 7, 2024 | Jun 7, 2024 |
| 4 | Insider transaction | Jun 7, 2024 | Jun 7, 2024 |
| 4 | Insider transaction | Jun 7, 2024 | Jun 7, 2024 |
| 4 | Insider transaction | Jun 7, 2024 | Jun 7, 2024 |
| 144 | Notice of proposed sale | May 28, 2024 | — |
| 144 | Notice of proposed sale | May 28, 2024 | — |
| 144 | Notice of proposed sale | May 28, 2024 | — |
| 144 | Notice of proposed sale | May 28, 2024 | — |
| 4 | Insider transaction | May 24, 2024 | May 21, 2024 |
| 4 | Insider transaction | May 24, 2024 | May 21, 2024 |
| 4 | Insider transaction | May 24, 2024 | May 21, 2024 |
| 4 | Insider transaction | May 24, 2024 | May 21, 2024 |
| 4 | Insider transaction | Apr 15, 2024 | Apr 12, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 2, 2024 |
| 144 | Notice of proposed sale | Apr 2, 2024 | — |
| 4 | Insider transaction | Mar 19, 2024 | Mar 19, 2024 |
| 4 | Insider transaction | Mar 19, 2024 | Mar 19, 2024 |
| 4 | Insider transaction | Mar 19, 2024 | Mar 19, 2024 |
| 4 | Insider transaction | Mar 19, 2024 | Mar 19, 2024 |
| 4 | Insider transaction | Mar 7, 2024 | Mar 5, 2024 |
| 144 | Notice of proposed sale | Mar 5, 2024 | — |
| 4 | Insider transaction | Feb 7, 2024 | Feb 6, 2024 |
| 144 | Notice of proposed sale | Feb 6, 2024 | — |
| 4 | Insider transaction | Jan 4, 2024 | Jan 2, 2024 |
| 144 | Notice of proposed sale | Jan 2, 2024 | — |
| 4 | Insider transaction | Dec 15, 2023 | Dec 13, 2023 |
| 144 | Notice of proposed sale | Dec 15, 2023 | — |
| 144 | Notice of proposed sale | Dec 15, 2023 | — |
| 4 | Insider transaction | Dec 14, 2023 | Dec 12, 2023 |
| 144 | Notice of proposed sale | Dec 13, 2023 | — |
| 4 | Insider transaction | Dec 7, 2023 | Dec 5, 2023 |
| 4 | Insider transaction | Dec 7, 2023 | Dec 5, 2023 |
| 144 | Notice of proposed sale | Dec 5, 2023 | — |
| 4 | Insider transaction | Nov 30, 2023 | Nov 28, 2023 |
| 144 | Notice of proposed sale | Nov 27, 2023 | — |
| 4 | Insider transaction | Nov 21, 2023 | Nov 20, 2023 |
| 4 | Insider transaction | Nov 9, 2023 | Nov 7, 2023 |
| 144 | Notice of proposed sale | Nov 7, 2023 | — |
| 4 | Insider transaction | Oct 12, 2023 | Oct 10, 2023 |
| 144 | Notice of proposed sale | Oct 10, 2023 | — |
| 4 | Insider transaction | Sep 21, 2023 | Sep 19, 2023 |
| 144 | Notice of proposed sale | Sep 19, 2023 | — |
| 4 | Insider transaction | Sep 18, 2023 | Sep 14, 2023 |
| 144 | Notice of proposed sale | Sep 15, 2023 | — |
| 144 | Notice of proposed sale | Sep 14, 2023 | — |
| 4 | Insider transaction | Sep 12, 2023 | Sep 9, 2023 |
| 4 | Insider transaction | Jun 16, 2023 | Jun 14, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 14, 2023 |
| 3 | Initial insider ownership | Jun 15, 2023 | Jun 14, 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
- Miscellaneous Electrical Machinery, Equipment & Supplies (SIC 3690)
- Listed as
- AMPX (NYSE), AMPX-WT (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Fremont, CA
- SEC filer status
- , Emerging growth company
- SEC CIK
- 1899287
- Former names
- Kensington Capital Acquisition Corp. IV (until Sep 14, 2022)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.