ESS Tech, Inc. (GWH) Ownership
GWH ownership summary
as of October 18, 2026- Institutions
- 19.0% of shares outstanding
- Insiders
- 7.31% of shares outstanding
- Shares outstanding
- 40.3M
- Float
- 29.8M shares available to trade
- Short interest
- 6.07% 2.4M shares short
- Days to cover
- 2.09 short interest down 16.9% vs prior month
- Institutions 19.04%
- Insiders 7.31%
- Other investors 73.65%
GWH top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | SoftBank Group Corp | 5.95% | 2.4M | $203,743 | — | June 30, 2026 |
| 2 | Alyeska Investment Group, L.P. | 3.48% | 1.4M | $119,000 | — | June 30, 2026 |
| 3 | Vanguard Capital Management, LLC | 1.59% | 639K | $54,308 | +4,200 (+0.7%) | June 30, 2026 |
| 4 | UBS Group AG | 1.50% | 603K | $51,222 | +453,328 (+303.7%) | June 30, 2026 |
| 5 | Arosa Capital Management LP | 1.37% | 550K | $46,750 | −360,000 (−39.6%) | June 30, 2026 |
| 6 | Heights Capital Management Inc | 1.36% | 549K | $46,633 | −414,874 (−43.1%) | June 30, 2026 |
| 7 | Shay Capital LLC | 0.52% | 210K | $17,862 | +30,146 (+16.7%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 0.52% | 210K | $17,853 | −13,524 (−6.0%) | June 30, 2026 |
| 9 | BlackRock Inc | 0.33% | 134K | $11,379 | +83,497 (+165.8%) | June 30, 2026 |
| 10 | Vanguard Fiduciary Trust Co | 0.32% | 130K | $11,040 | +60,475 (+87.1%) | June 30, 2026 |
| 11 | Pathstone Holdings LLC | 0.22% | 89K | $7,563 | +1,534 (+1.8%) | June 30, 2026 |
| 12 | FMR Inc | 0.13% | 52K | $4,461 | −4 (−0.0%) | June 30, 2026 |
| 13 | Northern Trust Corp | 0.12% | 48K | $4,040 | +16,193 (+51.7%) | June 30, 2026 |
| 14 | State Street Corp | 0.12% | 47K | $3,993 | — | June 30, 2026 |
| 15 | Green Alpha Advisors, LLC | 0.09% | 37K | $3,143 | −78,802 (−68.1%) | September 30, 2026 |
| 16 | Pks Advisory Services, LLC | 0.06% | 24K | $2,040 | +24,000 (0.0%) | June 30, 2026 |
| 17 | Bridgeway Capital Management, LLC | 0.05% | 20K | $1,700 | — | June 30, 2026 |
| 18 | JPMorgan Chase & Co | 0.05% | 20K | $1,691 | −11,640 (−36.9%) | June 30, 2026 |
| 19 | PRIMORIS WEALTH ADVISORS, LLC | 0.04% | 16K | $1,402 | — | June 30, 2026 |
| 20 | Renaissance Technologies Corp | 0.03% | 13K | $1,080 | +12,700 (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 9 holders added 686K shares and 6 cut 879K.
GWH top mutual fund and ETF holders
11 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 0.91% | 367K | $31,227 | — | August 31, 2026 |
| 2 | Abante Quant Value FI | 0.65% | 262K | $22,285 | +199,372 (+317.4%) | August 31, 2026 |
| 3 | Fidelity Extended Market Index | 0.28% | 115K | $9,735 | −615 (−0.5%) | August 31, 2026 |
| 4 | iShares Micro-Cap ETF | 0.19% | 75K | $6,345 | −515 (−0.7%) | September 30, 2026 |
| 5 | Fidelity Series Total Market Index | 0.07% | 30K | $2,559 | — | August 31, 2026 |
| 6 | Fidelity Total Market Index | 0.07% | 28K | $2,412 | +4,169 (+17.2%) | August 31, 2026 |
| 7 | 1290 VT Micro Cap K | 0.01% | 5,244 | $446 | — | August 31, 2026 |
| 8 | Vanguard U.S. Eq Idx £ Acc | <0.01% | 1,314 | $112 | — | August 31, 2026 |
| 9 | State Street Balanced Index K | <0.01% | 971 | $83 | — | August 31, 2026 |
| 10 | Knights of Columbus U.S. All Cap Idx I | <0.01% | 131 | $11 | — | August 31, 2026 |
| 11 | Azimut Strategic Trend | 0.00% | 3 | $0 | — | June 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
GWH insider transactions
latest 2| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-20 | Kate Eileen Suhadolnik | Sell | $1.54 | 741 | $1,141 |
| 2026-02-20 | Kelly F Goodman | Sell | $1.54 | 2,269 | $3,494 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
GWH shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns GWH
Institutional investors own 19.0% of ESS Tech's shares and insiders 7.31%. The largest holder is SoftBank Group Corp with 5.95% of the shares (2.4M), as of June 30, 2026. Among the top 20 institutions, 9 added shares and 6 reduced their stake in the latest filings. Short interest is 6.07% of the float, or 2.09 days of average trading volume. The share count fell 85.2% since 2020.
Related: GWH analyst forecast, GWH key metrics. See the GWH stock overview for the latest quote and news.
GWH ownership FAQ
Who owns the most ESS Tech stock?
The largest shareholders of ESS Tech are SoftBank Group Corp (5.95%), Alyeska Investment Group, L.P. (3.48%), Vanguard Capital Management, LLC (1.59%), UBS Group AG (1.50%), Arosa Capital Management LP (1.37%).
What percentage of ESS Tech is owned by institutions?
Institutions hold 19.0% of ESS Tech's shares outstanding; insiders hold 7.31%.
Which funds own ESS Tech?
The largest fund holders of ESS Tech are Vanguard MStar Total Stk Mkt Idx Invest (0.91%), Abante Quant Value FI (0.65%), Fidelity Extended Market Index (0.28%), iShares Micro-Cap ETF (0.19%), Fidelity Series Total Market Index (0.07%).
What is ESS Tech's short interest?
2.4M shares of ESS Tech were sold short, 6.07% of the float; at the average daily volume it would take 2.09 days to cover.
Are insiders buying or selling ESS Tech?
Of the latest 2 reported insider transactions in ESS Tech (since February 20, 2026), 0 were purchases and 2 were sales.
How many shares of ESS Tech are outstanding?
ESS Tech has 40.3M shares outstanding, of which 29.8M are in the public float.