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 |
| 8-K |
Current report
Material agreement, New debt
|
Aug 13, 2026 | Aug 7, 2026 |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2026 | Aug 4, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 17, 2026 | Jun 11, 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 |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 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 |
| 8-K |
Current report
Auditor change
|
Apr 21, 2026 | Apr 17, 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 |
| 8-K |
Current report
Agreement ended
|
Feb 3, 2026 | Jan 30, 2026 |
| 8-K |
Current report
Other events
|
Jan 12, 2026 | Jan 12, 2026 |
| 8-K |
Current report
Officer or director change
|
Dec 22, 2025 | Dec 18, 2025 |
| 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
Officer or director change
|
Oct 6, 2025 | Oct 6, 2025 |
| 8-K |
Current report
Officer or director change
|
Sep 2, 2025 | Sep 2, 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
Shareholder vote results
|
Jun 18, 2025 | Jun 12, 2025 |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 8, 2025 | May 8, 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 |
| 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 |
| 8-K |
Current report
Results of operations
|
Mar 4, 2025 | Mar 4, 2025 |
| 424B7 | Filing | Dec 9, 2024 | — |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 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 |
| 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 |
| 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 |
| SC TO-I/A | Filing | Jul 24, 2024 | — |
| EFFECT | Filing | Jul 8, 2024 | — |
| 424B3 | Prospectus | Jul 8, 2024 | — |
| SC TO-I/A | Filing | Jul 3, 2024 | — |
| S-4/A | Filing | Jul 3, 2024 | — |
| SC TO-I | Filing | Jun 24, 2024 | — |
| S-4 | Registration for a merger or exchange | Jun 24, 2024 | — |
| SC TO-I/A | Filing | Jun 13, 2024 | — |
| SC TO-I/A | Filing | Jun 12, 2024 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 6, 2024 | Jun 6, 2024 |
| SC TO-I/A | Filing | Jun 4, 2024 | — |
| CORRESP | Letter to the SEC | Jun 3, 2024 | — |
| UPLOAD | Letter from the SEC | May 22, 2024 | — |
| 8-K |
Current report
Change to shareholder rights, Other events
|
May 14, 2024 | May 13, 2024 |
| SC TO-I | Filing | May 13, 2024 | — |
| 424B3 | Prospectus | May 13, 2024 | — |
| 424B3 | Prospectus | May 13, 2024 | — |
| 10-Q | Quarterly report | May 9, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 9, 2024 | May 9, 2024 |
| ARS | Annual report to shareholders | Apr 25, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 25, 2024 | — |
| DEF 14A | Proxy statement | Apr 25, 2024 | Jun 6, 2024 |
| 8-K |
Current report
Other events
|
Apr 1, 2024 | Apr 1, 2024 |
| S-8 | Employee stock plan registration | Mar 28, 2024 | — |
| 10-K | Annual report | Mar 28, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 21, 2024 | Mar 21, 2024 |
| 8-K |
Current report
Other events
|
Jan 16, 2024 | Jan 16, 2024 |
| 10-Q | Quarterly report | Nov 13, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2023 | Nov 9, 2023 |
| EFFECT | Filing | Oct 27, 2023 | — |
| RW | Filing | Oct 27, 2023 | — |
| POS AM | Filing | Oct 27, 2023 | — |
| 424B3 | Prospectus | Oct 23, 2023 | — |
| 8-K |
Current report
Agreement ended
|
Oct 23, 2023 | Oct 21, 2023 |
| EFFECT | Filing | Oct 10, 2023 | — |
| 424B3 | Prospectus | Oct 10, 2023 | — |
| EFFECT | Filing | Oct 5, 2023 | — |
| EFFECT | Filing | Oct 5, 2023 | — |
| CORRESP | Letter to the SEC | Oct 5, 2023 | — |
| UPLOAD | Letter from the SEC | Oct 5, 2023 | — |
| 424B3 | Prospectus | Oct 3, 2023 | — |
| 8-K |
Current report
Agreement ended, Other events
|
Oct 3, 2023 | Oct 2, 2023 |
| POS AM | Filing | Oct 3, 2023 | — |
| POS AM | Filing | Oct 3, 2023 | — |
| S-3 | Shelf registration | Oct 3, 2023 | — |
| 424B3 | Prospectus | Sep 21, 2023 | — |
| 424B3 | Prospectus | Sep 21, 2023 | — |
| 424B3 | Prospectus | Sep 21, 2023 | — |
| 424B3 | Prospectus | Sep 21, 2023 | — |
| 424B3 | Prospectus | Sep 21, 2023 | — |
| 8-K |
Current report
Other events
|
Sep 21, 2023 | Sep 21, 2023 |
| 424B3 | Prospectus | Aug 11, 2023 | — |
| 424B3 | Prospectus | Aug 11, 2023 | — |
| 424B3 | Prospectus | Aug 11, 2023 | — |
| 10-Q | Quarterly report | Aug 11, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 10, 2023 | Aug 10, 2023 |
| 424B3 | Prospectus | Jul 25, 2023 | — |
| 424B3 | Prospectus | Jul 25, 2023 | — |
| 424B3 | Prospectus | Jul 25, 2023 | — |
| 8-K |
Current report
Other events
|
Jul 25, 2023 | Jul 24, 2023 |
| 424B3 | Prospectus | Jun 27, 2023 | — |
| EFFECT | Filing | Jun 26, 2023 | — |
| CORRESP | Letter to the SEC | Jun 22, 2023 | — |
| S-4/A | Filing | Jun 21, 2023 | — |
| 424B3 | Prospectus | Jun 15, 2023 | — |
| 424B3 | Prospectus | Jun 15, 2023 | — |
| 424B3 | Prospectus | Jun 15, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Jun 15, 2023 | Jun 13, 2023 |
| UPLOAD | Letter from the SEC | Jun 14, 2023 | — |
| 424B3 | Prospectus | Jun 9, 2023 | — |
| 424B3 | Prospectus | Jun 9, 2023 | — |
| 424B3 | Prospectus | Jun 9, 2023 | — |
| 8-K |
Current report
Shareholder vote results, Other events
|
Jun 9, 2023 | Jun 1, 2023 |
| S-4 | Registration for a merger or exchange | Jun 7, 2023 | — |
| 424B3 | Prospectus | May 12, 2023 | — |
| 424B3 | Prospectus | May 12, 2023 | — |
| 424B3 | Prospectus | May 12, 2023 | — |
| 10-Q | Quarterly report | May 11, 2023 | Mar 31, 2023 |
| 424B3 | Prospectus | May 10, 2023 | — |
| 424B3 | Prospectus | May 10, 2023 | — |
| 424B3 | Prospectus | May 10, 2023 | — |
| 8-K |
Current report
Material agreement, Change in control
|
May 10, 2023 | May 9, 2023 |
| 8-K |
Current report
Results of operations
|
May 10, 2023 | May 10, 2023 |
| ARS | Annual report to shareholders | Apr 28, 2023 | Dec 31, 2022 |
| 424B3 | Prospectus | Apr 27, 2023 | — |
| 424B3 | Prospectus | Apr 27, 2023 | — |
| 424B3 | Prospectus | Apr 27, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Apr 27, 2023 | Apr 25, 2023 |
| DEFA14A | Additional proxy material | Apr 27, 2023 | — |
| DEF 14A | Proxy statement | Apr 27, 2023 | Jun 8, 2023 |
| 424B3 | Prospectus | Apr 19, 2023 | — |
| 424B3 | Prospectus | Apr 19, 2023 | — |
| 424B3 | Prospectus | Apr 19, 2023 | — |
| 8-K |
Current report
Material agreement
|
Apr 19, 2023 | Apr 15, 2023 |
| EFFECT | Filing | Apr 12, 2023 | — |
| UPLOAD | Letter from the SEC | Apr 11, 2023 | — |
| 424B3 | Prospectus | Apr 11, 2023 | — |
| 424B3 | Prospectus | Apr 11, 2023 | — |
| CORRESP | Letter to the SEC | Apr 10, 2023 | — |
| EFFECT | Filing | Apr 7, 2023 | — |
| EFFECT | Filing | Apr 7, 2023 | — |
| S-4 POS | Filing | Apr 5, 2023 | — |
| S-1 | Registration statement | Apr 5, 2023 | — |
| POS AM | Filing | Apr 5, 2023 | — |
| POS AM | Filing | Apr 5, 2023 | — |
| S-8 | Employee stock plan registration | Mar 31, 2023 | — |
| 10-K | Annual report | Mar 30, 2023 | Dec 31, 2022 |
| 424B3 | Prospectus | Mar 23, 2023 | — |
| 424B3 | Prospectus | Mar 23, 2023 | — |
| 424B3 | Prospectus | Mar 23, 2023 | — |
| 8-K |
Current report
Results of operations, Bylaw or fiscal year change
|
Mar 23, 2023 | Mar 21, 2023 |
| 424B3 | Prospectus | Mar 9, 2023 | — |
| 424B3 | Prospectus | Mar 9, 2023 | — |
| 424B3 | Prospectus | Mar 9, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Mar 9, 2023 | Mar 6, 2023 |
| 424B3 | Prospectus | Feb 7, 2023 | — |
| 424B3 | Prospectus | Feb 7, 2023 | — |
| 424B3 | Prospectus | Feb 7, 2023 | — |
| 8-K |
Current report
Other events
|
Feb 7, 2023 | Feb 7, 2023 |
| 424B3 | Prospectus | Jan 12, 2023 | — |
| 424B3 | Prospectus | Jan 12, 2023 | — |
| 424B3 | Prospectus | Jan 12, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Jan 12, 2023 | Jan 7, 2023 |
| EFFECT | Filing | Dec 27, 2022 | — |
| 424B3 | Prospectus | Dec 27, 2022 | — |
| S-1/A | Amended registration statement | Dec 27, 2022 | — |
| CORRESP | Letter to the SEC | Dec 22, 2022 | — |
| 424B3 | Prospectus | Dec 5, 2022 | — |
| EFFECT | Filing | Dec 2, 2022 | — |
| CORRESP | Letter to the SEC | Dec 2, 2022 | — |
| CORRESP | Letter to the SEC | Nov 29, 2022 | — |
| CORRESP | Letter to the SEC | Nov 29, 2022 | — |
| CORRESP | Letter to the SEC | Nov 16, 2022 | — |
| S-1/A | Amended registration statement | Nov 16, 2022 | — |
| CORRESP | Letter to the SEC | Nov 16, 2022 | — |
| S-1/A | Amended registration statement | Nov 16, 2022 | — |
| S-8 | Employee stock plan registration | Nov 16, 2022 | — |
| 424B3 | Prospectus | Nov 16, 2022 | — |
| 8-K/A | Amended current report | Nov 16, 2022 | Sep 14, 2022 |
| 424B3 | Prospectus | Nov 14, 2022 | — |
| 10-Q | Quarterly report | Nov 14, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2022 | Nov 10, 2022 |
| UPLOAD | Letter from the SEC | Nov 7, 2022 | — |
| S-1/A | Amended registration statement | Oct 25, 2022 | — |
| S-1/A | Amended registration statement | Oct 25, 2022 | — |
| CORRESP | Letter to the SEC | Oct 24, 2022 | — |
| CORRESP | Letter to the SEC | Oct 24, 2022 | — |
| 424B3 | Prospectus | Oct 20, 2022 | — |
| 8-K |
Current report
Other events
|
Oct 20, 2022 | Oct 19, 2022 |
| UPLOAD | Letter from the SEC | Oct 18, 2022 | — |
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.