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 |
|---|---|---|---|
| S-3ASR | Automatic shelf registration | Oct 9, 2026 | — |
| 8-K |
Current report
Material agreement
|
Sep 28, 2026 | Sep 23, 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 | — |
| 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 | — |
| 8-K |
Current report
Material agreement, New debt
|
Aug 13, 2026 | Aug 7, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 10, 2026 | — |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2026 | Aug 4, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 27, 2026 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 17, 2026 | Jun 11, 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 | — |
| 8-K/A |
Amended current report
Unregistered share sale
|
May 19, 2026 | May 6, 2026 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
May 7, 2026 | May 6, 2026 |
| 4/A | Form 4/a | May 7, 2026 | Dec 19, 2025 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 5, 2026 |
| 8-K |
Current report
Results of operations
|
May 6, 2026 | May 6, 2026 |
| ARS | Annual report to shareholders | Apr 29, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 29, 2026 | — |
| DEF 14A | Proxy statement | Apr 29, 2026 | Jun 11, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 28, 2026 | — |
| 8-K |
Current report
Auditor change
|
Apr 21, 2026 | Apr 17, 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 |
| S-8 | Employee stock plan registration | Mar 6, 2026 | — |
| 10-K | Annual report | Mar 6, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 4, 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 | — |
| 8-K |
Current report
Agreement ended
|
Feb 3, 2026 | Jan 30, 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 | — |
| 8-K |
Current report
Other events
|
Jan 12, 2026 | Jan 12, 2026 |
| 4 | Insider transaction | Dec 22, 2025 | Dec 19, 2025 |
| 8-K |
Current report
Officer or director change
|
Dec 22, 2025 | Dec 18, 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 | — |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 6, 2025 | Nov 6, 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 |
| 8-K |
Current report
Officer or director change
|
Oct 6, 2025 | Oct 6, 2025 |
| 8-K |
Current report
Officer or director change
|
Sep 2, 2025 | Sep 2, 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 | — |
| 10-Q | Quarterly report | Aug 7, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 7, 2025 | Aug 7, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 6, 2025 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 18, 2025 | Jun 12, 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 |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 8, 2025 | May 8, 2025 |
| 4 | Insider transaction | May 6, 2025 | May 1, 2025 |
| 3 | Initial insider ownership | May 6, 2025 | May 1, 2025 |
| ARS | Annual report to shareholders | Apr 25, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 25, 2025 | — |
| DEF 14A | Proxy statement | Apr 25, 2025 | Jun 12, 2025 |
| 8-K |
Current report
Officer or director change
|
Apr 23, 2025 | Apr 22, 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 |
| S-8 | Employee stock plan registration | Mar 20, 2025 | — |
| 10-K | Annual report | Mar 20, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 20, 2025 | Mar 20, 2025 |
| 4 | Insider transaction | Mar 18, 2025 | Mar 14, 2025 |
| 4 | Insider transaction | Mar 12, 2025 | Mar 10, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 4, 2025 | Mar 4, 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 | — |
| 424B7 | Filing | Dec 9, 2024 | — |
| 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 | — |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 144 | Notice of proposed sale | Nov 7, 2024 | — |
| 8-K |
Current report
Results of operations
|
Nov 7, 2024 | Nov 7, 2024 |
| 8-K |
Current report
Other events
|
Nov 5, 2024 | Nov 1, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2024 | Oct 29, 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 | — |
| S-8 | Employee stock plan registration | Oct 23, 2024 | — |
| 424B7 | Filing | Oct 23, 2024 | — |
| 8-K |
Current report
Change in control, Officer or director change
|
Oct 23, 2024 | Oct 23, 2024 |
| 8-K |
Current report
Listing notice
|
Sep 20, 2024 | Sep 19, 2024 |
| 8-K |
Current report
Officer or director change
|
Sep 12, 2024 | Sep 6, 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 |
| 8-K |
Current report
Officer or director change
|
Aug 14, 2024 | Aug 12, 2024 |
| 10-Q | Quarterly report | Aug 9, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Jul 25, 2024 | Jul 23, 2024 |
| SC TO-I/A | Filing | Jul 24, 2024 | — |
| EFFECT | Filing | Jul 8, 2024 | — |
| 424B3 | Prospectus | Jul 8, 2024 | — |
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.