Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in GWH held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | SOFTBANK GROUP CORP | 2.4M | $2.8M | 0.0% | 19.029% | 0.02% |
| 2 | Alyeska Investment Group, L.P. | 1.4M | $1.6M | 0.0% | 11.114% | 0.00% |
| 3 | HEIGHTS CAPITAL MANAGEMENT, INC | 963K | $1.1M | β | 7.649% | 0.32% |
| 4 | Arosa Capital Management LP | 910K | $1.1M | -4.2% | 7.224% | 0.31% |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | 635K | $743K | β | 5.039% | 0.00% |
| 6 | GEODE CAPITAL MANAGEMENT, LLC | 224K | $262K | +63.8% | 1.775% | 0.00% |
| 7 | Shay Capital LLC | 180K | $211K | 0.0% | 1.429% | 0.02% |
| 8 | UBS Group AG | 149K | $175K | +233.8% | 1.185% | 0.00% |
| 9 | Green Alpha Advisors, LLC | 115K | $134K | -3.5% | 0.910% | 0.13% |
| 10 | Pathstone Holdings, LLC | 87K | $102K | -1.7% | 0.694% | 0.00% |
| 11 | VANGUARD FIDUCIARY TRUST CO | 69K | $81K | β | 0.551% | 0.00% |
| 12 | FMR LLC | 52K | $61K | +0.0% | 0.417% | 0.00% |
| 13 | BlackRock, Inc. | 50K | $59K | 0.0% | 0.400% | 0.00% |
| 14 | STATE STREET CORP | 47K | $55K | 0.0% | 0.373% | 0.00% |
| 15 | NORTHERN TRUST CORP | 31K | $37K | +196.0% | 0.249% | 0.00% |
| 16 | BRIDGEWAY CAPITAL MANAGEMENT, LLC | 20K | $23K | +100.0% | 0.159% | 0.00% |
| 17 | TWO SIGMA SECURITIES, LLC | 17K | $19K | β | 0.132% | 0.00% |
| 18 | PRIMORIS WEALTH ADVISORS, LLC | 17K | $19K | +65.0% | 0.131% | 0.01% |
| 19 | Resurgent Financial Advisors LLC | 16K | $18K | β | 0.124% | 0.01% |
| 20 | LPL Financial LLC | 14K | $17K | +1.4% | 0.115% | 0.00% |
| 21 | ADVISOR GROUP HOLDINGS, INC. | 6K | $7K | +2.2% | 0.050% | 0.00% |
| 22 | MORGAN STANLEY | 5K | $5K | +119.8% | 0.036% | 0.00% |
| 23 | Golden State Wealth Management, LLC | 3K | $3K | 0.0% | 0.021% | 0.00% |
| 24 | Rockefeller Capital Management L.P. | 2K | $2K | β | 0.016% | 0.00% |
| 25 | Vanguard Global Advisers, LLC | 1K | $2K | β | 0.010% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in GWH β a direct measure of their conviction.
Filings activity in GWH during Q1 2026, grouped by how each filer changed its position.
7 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 50 | 9.1% | 83.29% | 30.04 pp | $9M | 27% |
| Q4 2025 | 55 | +22% | 113.33% | +58.71 pp | $12M | +108% |
| Q3 2025 | 45 | 10% | 54.62% | +17.14 pp | $6M | +46% |
| Q2 2025 | 50 | +8.7% | 37.48% | 68.76 pp | $4M | 65% |
| Q1 2025 | 46 | 16% | 106.24% | 83.51 pp | $11M | 44% |
| Q4 2024 | 55 | +15% | 189.75% | 2.89 pp | $20M | 1.5% |
| Q3 2024 | 48 | β | 192.64% | β | $20M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as the highest-conviction signal because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| Jun 4, 2026 | Buckley Drew P | Buy | 25K | $1.03 | $26K |
Quick answers to the most common questions about buying GWH stock.
Based on Q1 2026 13F filings, institutional ownership of ESS Tech, Inc. stands at 83.3%, held across 50 reporting institutions.
SOFTBANK GROUP CORP is the largest reported institutional holder of GWH, with approximately 2,396,980 shares worth $0.00B as of Q1 2026.
Yes β 1 widely-followed marquee investor appear among the top 25 institutional holders of GWH, including TWO SIGMA SECURITIES, LLC.
Our composite Smart Money Score for GWH is 32 out of 100 (Bearish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
11 institutions opened new positions in GWH during Q1 2026, while 16 fully exited. 9 added to existing positions and 28 trimmed.
GWH institutional ownership fell by 30.04 percentage points quarter-over-quarter, with a net change of -5 holders.
The top 10 institutions account for 95.2% of all reported 13F value in GWH, and the top 25 account for 99.9%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
ESS Tech, Inc. (GWH) Institutional Ownership