ESS TECH INC -CW27 (GWH-WS) Top Institutional Shareholders
ESS TECH INC -CW27 (GWH-WS) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $39,682 in GWH-WS holdings during the latest filing period.
Heights Capital Management, Inc is currently the largest disclosed institutional shareholder of GWH-WS tracked by InsiderSet, reporting ownership valued at approximately $11,842 in its March 31, 2026 SEC Form 13F filing.
The top 10 institutional shareholders tracked on this page collectively account for approximately 100% of the total disclosed GWH-WS value among the investors covered in this analysis. Major shareholders include Heights Capital Management, Inc, Saba Capital Management, L.P., Lmr Partners Llp, and several other long-term asset managers with concentrated positions in ESS TECH INC -CW27 (GWH-WS).
This page ranks the largest institutional GWH-WS shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
11
Total Reported Value
$39,682
Largest Holder
Heights Capital Management, Inc
Largest Position
$11,842
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
15
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Heights Capital Management, Inc | 0.00% | 586,218 | $11,842 | — | — | — | |
| Saba Capital Management, L.P. | 0.00% | 303,596 | $7,985 | — | — | — | |
| Lmr Partners Llp | 0.00% | 391,284 | $7,904 | — | — | — | |
| Openarc Corporate Advisory, Llc | 0.00% | 253,555 | $5,705 | — | — | — | |
| Susquehanna International Group, Llp | 0.00% | 154,324 | $3,117 | — | — | — | |
| Jane Street Group, Llc | 0.00% | 58,356 | $1,471 | — | — | — | |
| Greenhouse Wealth Management, Llc | 0.00% | 50,000 | $1,125 | — | — | — | |
| Marathon Trading Investment Management Llc | 0.00% | 20,130 | $453 | — | — | — | |
| Wolverine Asset Management Llc | 0.00% | 3,634 | $73 | — | — | — | |
| Clear Street Group Inc. | 0.00% | 200 | $4 | — | — | — | |
| Vestcor Inc | 0.00% | 105,182 | $3 | — | — | — |
Frequently asked questions about GWH-WS
Who owns the most GWH-WS stock?
The largest holders of GWH-WS are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for ESS TECH INC -CW27 (GWH-WS).
Is GWH-WS widely held by superinvestors?
Many widely followed stocks like GWH-WS appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly GWH-WS is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.