16 institutions reported holding $47,729 of ESS TECH INC (GWH.WS) in SEC 13F filings for 2026-03-31. Largest institutional holders: HEIGHTS CAPITAL MANAGEMENT, INC ($11,842), Saba Capital Management, L.P. ($7,985), LMR Partners LLP ($7,904), OpenArc Corporate Advisory, LLC ($5,705), MILLENNIUM MANAGEMENT LLC ($5,050). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | HEIGHTS CAPITAL MANAGEMENT, INC | $11,842 | 586,218 | Hold |
| 2 | Saba Capital Management, L.P. | $7,985 | 303,596 | Hold |
| 3 | LMR Partners LLP | $7,904 | 391,284 | Hold |
| 4 | OpenArc Corporate Advisory, LLC | $5,705 | 253,555 | New |
| 5 | MILLENNIUM MANAGEMENT LLC | $5,050 | 250,000 | Hold |
| 6 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $3,117 | 154,324 | Trimmed |
| 7 | Vestcor Inc | $3,000 | 105,182 | Hold |
| 8 | JANE STREET GROUP, LLC | $1,471 | 58,356 | Trimmed |
| 9 | Greenhouse Wealth Management, LLC | $1,125 | 50,000 | Hold |
| 10 | Marathon Trading Investment Management LLC | $453 | 20,130 | Hold |
| 11 | WOLVERINE ASSET MANAGEMENT LLC | $73 | 3,634 | Added |
| 12 | Clear Street Group Inc. | $4 | 200 | Hold |
| 13 | UBS Group AG | $0 | 0 | Exited |
| 14 | BANK OF AMERICA CORP /DE/ | $0 | 0 | Exited |
| 15 | Virtu Financial LLC | $0 | 13,891 | New |
| 16 | Navalign, LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31