Company filings profile · CIK 0001819438
ESS Tech, Inc. — SEC filings & insider activity.
Real, source-linked SEC EDGAR activity for ESS Tech, Inc. (GWH): 20 filings in the last 90 days vs 14 in the prior 90 (filing-velocity rising ↑ · 1.43×). Latest material 8-K events, insider Form-4 transactions, and periodic reports — monitored for change.
✔ Verified against the public SEC EDGAR filing record as of Jun 21, 2026. Source-linked, daily-refreshed.
Material 8-K events — ESS Tech, Inc.
8-K disclosures decoded by item code (the material events: agreements, results, control/management changes, impairments, restatements).
| Filed | Event | |
|---|---|---|
| Jun 18, 2026 | Departure/Election of Directors or Officers | ↗ |
| Jun 15, 2026 | Delisting / Listing-Rule Failure; Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| May 29, 2026 | Item 5.07 | ↗ |
| May 7, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Apr 15, 2026 | Departure/Election of Directors or Officers | ↗ |
| Mar 5, 2026 | Results of Operations (earnings); Other Events; Financial Statements and Exhibits | ↗ |
| Jan 30, 2026 | Entry into a Material Agreement; Financial Statements and Exhibits | ↗ |
| Jan 29, 2026 | Results of Operations (earnings); Departure/Election of Directors or Officers; Financial Statements and Exhibits | ↗ |
| Jan 6, 2026 | Departure/Election of Directors or Officers; Financial Statements and Exhibits | ↗ |
| Dec 5, 2025 | Entry into a Material Agreement; Financial Statements and Exhibits | ↗ |
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Insider transactions (Form 4 / 3 / 5)
Recent filings
| Filed | Form | Detail | |
|---|---|---|---|
| Jun 18, 2026 | 8-K | Departure/Election of Directors or Officers | ↗ |
| Jun 15, 2026 | 8-K | Delisting / Listing-Rule Failure; Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Jun 8, 2026 | 4 | ↗ | |
| Jun 2, 2026 | 4 | ↗ | |
| Jun 2, 2026 | 4 | ↗ | |
| Jun 2, 2026 | 4 | ↗ | |
| Jun 2, 2026 | 4 | ↗ | |
| Jun 2, 2026 | 4 | ↗ | |
| Jun 1, 2026 | SD | SD | ↗ |
| May 29, 2026 | 8-K | Item 5.07 | ↗ |
| May 26, 2026 | 4 | ↗ | |
| May 26, 2026 | 4 | ↗ | |
| May 15, 2026 | SCHEDULE 13G/A | ↗ | |
| May 11, 2026 | SCHEDULE 13G | ↗ | |
| May 7, 2026 | 10-Q | 10-Q | ↗ |
| May 7, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Apr 15, 2026 | ARS | ARS | ↗ |
| Apr 15, 2026 | DEFA14A | DEFA14A | ↗ |
| Apr 15, 2026 | DEF 14A | DEF 14A | ↗ |
| Apr 15, 2026 | 8-K | Departure/Election of Directors or Officers | ↗ |
| Mar 5, 2026 | S-8 | S-8 | ↗ |
| Mar 5, 2026 | 10-K | 10-K | ↗ |
| Mar 5, 2026 | 8-K | Results of Operations (earnings); Other Events; Financial Statements and Exhibits | ↗ |
| Feb 26, 2026 | 4 | ↗ | |
| Feb 26, 2026 | 4 | ↗ | |
| Feb 26, 2026 | 4 | ↗ | |
| Feb 26, 2026 | 4 | ↗ | |
| Feb 17, 2026 | SCHEDULE 13G | ↗ | |
| Jan 30, 2026 | 8-K | Entry into a Material Agreement; Financial Statements and Exhibits | ↗ |
| Jan 30, 2026 | 424B5 | 424B5 | ↗ |
| Jan 29, 2026 | 4 | FORM 4 | ↗ |
| Jan 29, 2026 | 3 | FORM 3 | ↗ |
| Jan 29, 2026 | 8-K | Results of Operations (earnings); Departure/Election of Directors or Officers; Financial Statements and Exhibits | ↗ |
| Jan 6, 2026 | 8-K | Departure/Election of Directors or Officers; Financial Statements and Exhibits | ↗ |
| Dec 11, 2025 | EFFECT | Item ; Item ; Item | ↗ |
| Dec 11, 2025 | 424B3 | 424B3 | ↗ |
| Dec 11, 2025 | 424B5 | 424B5 | ↗ |
| Dec 9, 2025 | CORRESP | ↗ | |
| Dec 5, 2025 | 8-K | Entry into a Material Agreement; Financial Statements and Exhibits | ↗ |
| Nov 21, 2025 | 4 | FORM 4 | ↗ |