Updated Jul 16, 2026 · Last SEC filing 2026-06-08
ESS Tech, Inc. (GWH) has filed 8 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-08. 6 Form 8-K material event filings were reported by GWH in the last 90 days. InsiderAlpha tracks every GWH SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.
| SIC classification | Miscellaneous Electrical Machinery, Equipment & Supplies (SIC 3690) |
|---|---|
| SEC CIK | 0001819438 |
| Form 4 filings (90d) | 8 |
|---|---|
| Form 8-K filings (90d) | 6 |
| Latest Form 4 filing | 2026-06-08 |
| Date | Insider | Role | Transaction | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Buckley Drew P | CEO | P — Open-market purchase | 25.0K | $1.03 | $26K | SEC | |
| WELLMAN ALEXI | Insider | A — Grant or award | 13.5K | $0.00 | — | SEC | |
| Garabedian Raffi | Insider | A — Grant or award | 13.5K | $0.00 | — | SEC | |
| Hossfeld Rich | Insider | A — Grant or award | 13.5K | $0.00 | — | SEC | |
| Nijhawan Sandeep | Insider | A — Grant or award | 13.5K | $0.00 | — | SEC | |
| Quarls Harry | Insider | A — Grant or award | 13.5K | $0.00 | — | SEC | |
| Suhadolnik Kate Eileen | Chief Financial Officer | S — Open-market sale | 1.9K | $0.93 | $2K | SEC | |
| Goodman Kelly F. | SEE REMARKS | S — Open-market sale | 2.8K | $0.93 | $3K | SEC | |
| Goodman Kelly F. | SEE REMARKS | S — Open-market sale | 2.5K | $0.92 | $2K | SEC | |
| Suhadolnik Kate Eileen | Chief Financial Officer | S — Open-market sale | 1.7K | $0.92 | $2K | SEC | |
| Suhadolnik Kate Eileen | Chief Financial Officer | S — Open-market sale | 741 | $1.54 | $1K | SEC | |
| Goodman Kelly F. | SEE REMARKS | S — Open-market sale | 2.3K | $1.54 | $3K | SEC | |
| Garabedian Raffi | Director | A — Grant or award | 13.5K | $0.00 | — | SEC | |
| Quarls Harry | Director | A — Grant or award | 13.5K | $0.00 | — | SEC | |
| Hossfeld Rich | Director | A — Grant or award | 13.5K | $0.00 | — | SEC |
All transactions sourced from SEC EDGAR Form 4 filings for ESS Tech, Inc. (GWH). Updated in real time as new filings are submitted to the SEC.
| Insider | Form 4 filings | Total transaction value |
|---|---|---|
| Suhadolnik Kate Eileen | 2 | $3K |
| Goodman Kelly F. | 2 | $5K |
| Quarls Harry | 1 | — |
| WELLMAN ALEXI | 1 | — |
| Hossfeld Rich | 1 | — |
SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in GWH insider filings:
| P | Open-market purchase by the insider |
|---|---|
| S | Open-market sale by the insider |
| A | Grant, award, or other acquisition from the issuer |
| M | Exercise or conversion of derivative security (e.g. options) |
| F | Payment of exercise price or tax liability via share withholding |
| G | Bona-fide gift of securities |
| D | Disposition to the issuer (e.g. share buyback participation) |
| J | Other acquisition or disposition |
| X | Exercise of in-the-money or at-the-money derivative security |
| C | Conversion of derivative security |
| V | Transaction voluntarily reported earlier than required |
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