ESS Tech, Inc. (GWH) ownership: Top institutional holder: SOFTBANK GROUP CORP. ($2.80M). Insider activity: Net Seller (0 buys, 10 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| SOFTBANK GROUP CORP. | 2396980.00 | $2.80M | 2026-03-31 |
| Alyeska Investment Group, L.P. | 1400000.00 | $1.64M | 2026-03-31 |
| HEIGHTS CAPITAL MANAGEMENT, INC | 963495.00 | $1.13M | 2026-03-31 |
| Arosa Capital Management LP | 910000.00 | $1.06M | 2026-03-31 |
| VANGUARD GROUP INC | 485919.00 | $913527.00 | 2025-12-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 634720.00 | $742622.00 | 2026-03-31 |
| GEODE CAPITAL MANAGEMENT, LLC | 223561.00 | $261580.00 | 2026-03-31 |
| Shay Capital LLC | 180000.00 | $210600.00 | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-05-22 | |
| Sell | null | 2026-05-22 | |
| Sell | null | 2026-05-21 | |
| Sell | null | 2026-05-21 | |
| Sell | null | 2026-02-20 | |
| Sell | null | 2026-02-20 | |
| Sell | null | 2026-02-13 | |
| Sell | null | 2026-02-13 |
Back to GWH overview · GWH earnings · All congressional trades
Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.