14 institutions reported holding $11,455 of ESS TECH INC (GWH.WS) in SEC 13F filings for 2026-06-30. Largest institutional holders: HEIGHTS CAPITAL MANAGEMENT, INC ($2,809), LMR Partners LLP ($2,152), Saba Capital Management, L.P. ($1,670), OpenArc Corporate Advisory, LLC ($1,395), MILLENNIUM MANAGEMENT LLC ($1,375). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | HEIGHTS CAPITAL MANAGEMENT, INC | $2,809 | 510,721 | Trimmed |
| 2 | LMR Partners LLP | $2,152 | 391,284 | Hold |
| 3 | Saba Capital Management, L.P. | $1,670 | 303,596 | Hold |
| 4 | OpenArc Corporate Advisory, LLC | $1,395 | 253,555 | Hold |
| 5 | MILLENNIUM MANAGEMENT LLC | $1,375 | 250,000 | Hold |
| 6 | Vestcor Inc | $1,000 | 105,182 | Hold |
| 7 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $592 | 107,548 | Trimmed |
| 8 | JANE STREET GROUP, LLC | $321 | 58,356 | Hold |
| 9 | Marathon Trading Investment Management LLC | $111 | 20,130 | Hold |
| 10 | WOLVERINE ASSET MANAGEMENT LLC | $27 | 4,834 | Added |
| 11 | Clear Street Group Inc. | $3 | 600 | Added |
| 12 | TORONTO DOMINION BANK | $0 | 100 | New |
| 13 | Greenhouse Wealth Management, LLC | $0 | 0 | Exited |
| 14 | Virtu Financial LLC | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-06-30