ESS Tech, Inc. SEC filings GWHT
ESS Tech, Inc. has 473 filings in SEC EDGAR's recent list, going back to Jul 31, 2020. Its latest annual report, Form ARS, was filed on Apr 15, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 11, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 5, 2026 (listing notice, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Listing notice, Regulation FD disclosure
|
Oct 5, 2026 | Oct 2, 2026 |
| 8-K |
Current report
Listing notice
|
Sep 30, 2026 | Sep 24, 2026 |
| DEF 14A | Proxy statement | Sep 24, 2026 | Sep 24, 2026 |
| EFFECT | Filing | Sep 16, 2026 | — |
| 424B3 | Prospectus | Sep 16, 2026 | — |
| PRE 14A | Preliminary proxy statement | Sep 15, 2026 | Sep 14, 2026 |
| S-3 | Shelf registration | Sep 8, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Sep 3, 2026 | Aug 28, 2026 |
| 4 | Insider transaction | Aug 24, 2026 | Aug 21, 2026 |
| 4 | Insider transaction | Aug 24, 2026 | Aug 21, 2026 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Other events
|
Aug 21, 2026 | Aug 20, 2026 |
| 424B5 | Prospectus supplement | Aug 21, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2026 | — |
| 10-Q | Quarterly report | Aug 11, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2026 | Aug 11, 2026 |
| 8-K |
Current report
Results of operations, Other events
|
Aug 6, 2026 | Aug 6, 2026 |
| 8-K |
Current report
Material agreement
|
Jul 17, 2026 | Jul 16, 2026 |
| 424B5 | Prospectus supplement | Jul 17, 2026 | — |
| 25-NSE | Delisting notice | Jul 2, 2026 | — |
| 8-K |
Current report
Listing notice
|
Jul 1, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Jun 23, 2026 | Jun 23, 2026 |
| 8-K |
Current report
Officer or director change
|
Jun 18, 2026 | Jun 12, 2026 |
| 8-K |
Current report
Listing notice, Regulation FD disclosure
|
Jun 15, 2026 | Jun 9, 2026 |
| 4 | Insider transaction | Jun 8, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | May 29, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | May 29, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | May 29, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | May 29, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | May 29, 2026 |
| SD | Specialized disclosure (conflict minerals) | Jun 1, 2026 | — |
| 8-K |
Current report
Shareholder vote results
|
May 29, 2026 | May 29, 2026 |
| 4 | Insider transaction | May 26, 2026 | May 21, 2026 |
| 4 | Insider transaction | May 26, 2026 | May 21, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 11, 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 15, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 15, 2026 | — |
| DEF 14A | Proxy statement | Apr 15, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Officer or director change
|
Apr 15, 2026 | Apr 10, 2026 |
| S-8 | Employee stock plan registration | Mar 5, 2026 | — |
| 10-K | Annual report | Mar 5, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations, Other events
|
Mar 5, 2026 | Mar 5, 2026 |
| 4 | Insider transaction | Feb 26, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 26, 2026 | Feb 20, 2026 |
| 4 | Insider transaction | Feb 26, 2026 | Feb 13, 2026 |
| 4 | Insider transaction | Feb 26, 2026 | Feb 13, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 17, 2026 | — |
| 8-K |
Current report
Material agreement
|
Jan 30, 2026 | Jan 29, 2026 |
| 424B5 | Prospectus supplement | Jan 30, 2026 | — |
| 4 | Insider transaction | Jan 29, 2026 | Jan 28, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 1, 2026 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Jan 29, 2026 | Jan 23, 2026 |
| 8-K |
Current report
Officer or director change
|
Jan 6, 2026 | Jan 1, 2026 |
| EFFECT | Filing | Dec 11, 2025 | — |
| 424B3 | Prospectus | Dec 11, 2025 | — |
| 424B5 | Prospectus supplement | Dec 11, 2025 | — |
| CORRESP | Letter to the SEC | Dec 9, 2025 | — |
| 8-K |
Current report
Material agreement
|
Dec 5, 2025 | Dec 4, 2025 |
| 4 | Insider transaction | Nov 21, 2025 | Nov 20, 2025 |
| 4 | Insider transaction | Nov 21, 2025 | Nov 20, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2025 | Nov 13, 2025 |
| S-3 | Shelf registration | Nov 13, 2025 | — |
| 8-K |
Current report
Material agreement
|
Nov 13, 2025 | Nov 13, 2025 |
| 424B5 | Prospectus supplement | Nov 13, 2025 | — |
| 10-Q | Quarterly report | Nov 13, 2025 | Sep 30, 2025 |
| 424B2 | Prospectus | Oct 22, 2025 | — |
| 424B2 | Prospectus | Oct 17, 2025 | — |
| 424B2 | Prospectus | Oct 15, 2025 | — |
| 4 | Insider transaction | Oct 15, 2025 | Oct 13, 2025 |
| 4 | Insider transaction | Oct 15, 2025 | Oct 13, 2025 |
| 4 | Insider transaction | Oct 15, 2025 | Oct 13, 2025 |
| 4 | Insider transaction | Oct 15, 2025 | Oct 13, 2025 |
| 4 | Insider transaction | Oct 15, 2025 | Oct 13, 2025 |
| 4 | Insider transaction | Oct 15, 2025 | Oct 13, 2025 |
| 4 | Insider transaction | Oct 15, 2025 | Oct 13, 2025 |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Oct 14, 2025 | Oct 14, 2025 |
| 424B2 | Prospectus | Oct 14, 2025 | — |
| 8-K |
Current report
Shareholder vote results
|
Oct 14, 2025 | Oct 13, 2025 |
| 424B2 | Prospectus | Oct 10, 2025 | — |
| 424B2 | Prospectus | Oct 9, 2025 | — |
| DEFA14A | Additional proxy material | Oct 7, 2025 | — |
| 424B2 | Prospectus | Oct 7, 2025 | — |
| 424B2 | Prospectus | Sep 30, 2025 | — |
| 144 | Notice of proposed sale | Sep 25, 2025 | — |
| 424B2 | Prospectus | Sep 25, 2025 | — |
| ARS | Annual report to shareholders | Sep 22, 2025 | Sep 22, 2025 |
| DEF 14A | Proxy statement | Sep 22, 2025 | Sep 22, 2025 |
| 424B2 | Prospectus | Sep 19, 2025 | — |
| 144 | Notice of proposed sale | Sep 17, 2025 | — |
| 424B2 | Prospectus | Sep 16, 2025 | — |
| 144 | Notice of proposed sale | Sep 10, 2025 | — |
| PRE 14A | Preliminary proxy statement | Sep 9, 2025 | Sep 9, 2025 |
| 4 | Insider transaction | Sep 5, 2025 | Aug 18, 2025 |
| 424B2 | Prospectus | Sep 5, 2025 | — |
| 144 | Notice of proposed sale | Sep 4, 2025 | — |
| 8-K |
Current report
Other events
|
Aug 29, 2025 | Aug 29, 2025 |
| 144 | Notice of proposed sale | Aug 29, 2025 | — |
| 4 | Insider transaction | Aug 29, 2025 | Aug 20, 2025 |
| 3 | Initial insider ownership | Aug 28, 2025 | Aug 1, 2025 |
| 3 | Initial insider ownership | Aug 28, 2025 | Aug 18, 2025 |
| 424B2 | Prospectus | Aug 28, 2025 | — |
| 4 | Insider transaction | Aug 21, 2025 | Aug 20, 2025 |
| 424B2 | Prospectus | Aug 21, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Aug 18, 2025 | Aug 12, 2025 |
| 424B2 | Prospectus | Aug 15, 2025 | — |
| 10-Q | Quarterly report | Aug 14, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 14, 2025 | Aug 14, 2025 |
| 8-K |
Current report
Officer or director change
|
Aug 7, 2025 | Aug 1, 2025 |
| 424B2 | Prospectus | Jul 28, 2025 | — |
| D | Filing | Jul 23, 2025 | — |
| 424B2 | Prospectus | Jul 22, 2025 | — |
| 424B2 | Prospectus | Jul 15, 2025 | — |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Results of operations, New debt, Unregistered share sale, Other events
|
Jul 11, 2025 | Jul 9, 2025 |
| 424B2 | Prospectus | Jul 11, 2025 | — |
| 424B3 | Prospectus | Jul 11, 2025 | — |
| 8-K |
Current report
Other events
|
Jun 4, 2025 | Jun 3, 2025 |
| SD | Specialized disclosure (conflict minerals) | May 30, 2025 | — |
| 8-K |
Current report
Other events
|
May 28, 2025 | May 27, 2025 |
| 4 | Insider transaction | May 22, 2025 | May 20, 2025 |
| 4 | Insider transaction | May 22, 2025 | May 20, 2025 |
| 10-Q | Quarterly report | May 15, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 15, 2025 | May 15, 2025 |
| 4 | Insider transaction | Apr 15, 2025 | May 20, 2023 |
| 4 | Insider transaction | Apr 15, 2025 | Apr 13, 2025 |
| 4 | Insider transaction | Apr 4, 2025 | Feb 10, 2025 |
| 8-K |
Current report
Material agreement
|
Mar 31, 2025 | Mar 31, 2025 |
| 424B5 | Prospectus supplement | Mar 31, 2025 | — |
| S-8 | Employee stock plan registration | Mar 31, 2025 | — |
| 10-K | Annual report | Mar 31, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 31, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Listing notice, Regulation FD disclosure
|
Mar 28, 2025 | Mar 24, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 3, 2025 | — |
| 3 | Initial insider ownership | Feb 14, 2025 | Feb 13, 2025 |
| 8-K |
Current report
Officer or director change
|
Feb 14, 2025 | Feb 13, 2025 |
| 4 | Insider transaction | Nov 18, 2024 | Nov 18, 2024 |
| 10-Q | Quarterly report | Nov 14, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2024 | Nov 13, 2024 |
| 8-K |
Current report
Material agreement, New debt
|
Nov 5, 2024 | Nov 1, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Nov 1, 2024 | — |
| 4 | Insider transaction | Sep 17, 2024 | Sep 11, 2024 |
| 4 | Insider transaction | Sep 3, 2024 | Aug 29, 2024 |
| 4 | Insider transaction | Sep 3, 2024 | Aug 30, 2024 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Aug 26, 2024 | Aug 23, 2024 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Shareholder vote results, Regulation FD disclosure, Other events
|
Aug 23, 2024 | Aug 23, 2024 |
| 10-Q | Quarterly report | Aug 14, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 14, 2024 | Aug 14, 2024 |
| DEFR14A | Filing | Aug 8, 2024 | — |
| PRE 14A | Preliminary proxy statement | Jul 29, 2024 | Jul 26, 2024 |
| DEF 14A | Proxy statement | Jul 26, 2024 | Jul 26, 2024 |
| SD | Specialized disclosure (conflict minerals) | May 24, 2024 | — |
| 8-K |
Current report
Shareholder vote results
|
May 21, 2024 | May 21, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 15, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 17, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 17, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 17, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 17, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 17, 2024 |
| 4 | Insider transaction | May 17, 2024 | May 17, 2024 |
| 4 | Insider transaction | May 15, 2024 | May 14, 2024 |
| 4 | Insider transaction | May 13, 2024 | May 10, 2024 |
| 4 | Insider transaction | May 9, 2024 | May 9, 2024 |
| 4 | Insider transaction | May 8, 2024 | Mar 7, 2024 |
| 10-Q | Quarterly report | May 8, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 7, 2024 | May 7, 2024 |
| ARS | Annual report to shareholders | Apr 5, 2024 | Apr 5, 2024 |
| DEFA14A | Additional proxy material | Apr 5, 2024 | — |
| DEF 14A | Proxy statement | Apr 5, 2024 | Apr 5, 2024 |
| 4 | Insider transaction | Mar 18, 2024 | Mar 15, 2024 |
| 10-K | Annual report | Mar 14, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 13, 2024 | Mar 13, 2024 |
| 8-K |
Current report
Listing notice
|
Mar 8, 2024 | Mar 6, 2024 |
| 4 | Insider transaction | Feb 16, 2024 | Feb 15, 2024 |
| 4/A | Form 4/a | Feb 16, 2024 | Mar 13, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| S-8 | Employee stock plan registration | Feb 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 31, 2024 | — |
| 424B3 | Prospectus | Dec 15, 2023 | — |
| EFFECT | Filing | Dec 14, 2023 | — |
| CORRESP | Letter to the SEC | Dec 12, 2023 | — |
| CORRESP | Letter to the SEC | Dec 7, 2023 | — |
| S-3/A | Filing | Dec 7, 2023 | — |
| UPLOAD | Letter from the SEC | Nov 20, 2023 | — |
| 4 | Insider transaction | Nov 16, 2023 | Nov 16, 2023 |
| 4 | Insider transaction | Nov 15, 2023 | Nov 15, 2023 |
| 4 | Insider transaction | Nov 14, 2023 | Nov 14, 2023 |
| S-3 | Shelf registration | Nov 14, 2023 | — |
| 10-Q | Quarterly report | Nov 14, 2023 | Sep 30, 2023 |
| 4 | Insider transaction | Nov 13, 2023 | Nov 13, 2023 |
| 4 | Insider transaction | Nov 13, 2023 | Nov 13, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2023 | Nov 7, 2023 |
| D | Filing | Sep 26, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Sep 25, 2023 | — |
| 3 | Initial insider ownership | Sep 25, 2023 | Sep 21, 2023 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure, Other events
|
Sep 25, 2023 | Sep 25, 2023 |
| 4 | Insider transaction | Sep 6, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Aug 30, 2023 | Aug 28, 2023 |
| 3 | Initial insider ownership | Aug 30, 2023 | Aug 28, 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
- GWHT (OTC)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Wilsonville, OR
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1819438
- Former names
- ACON S2 Acquisition Corp. (until Oct 8, 2021)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.