Holder evidence
50
SEC ownership of ESS Tech, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001819438.
Lead holder
SOFTBANK GROUP CORP.
13D/G signal
SOFTBANK GROUP CORP.
Latest evidence
31 Mar 2026
- CIK
- 0001819438
- Symbol
- GWH, GWH-WT on NYSE
- Location
- Wilsonville, OR
- SEC evidence mix
- 3/4/5, 13D/G, and 13F
- Lead holder
- SOFTBANK GROUP CORP.
- Latest large-stake holder
- SOFTBANK GROUP CORP.
- Latest evidence date
- 31 Mar 2026
Issuer identity
Ownership snapshot
Ownership snapshot
Top shareholders of ESS Tech, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Lead holder
SOFTBANK GROUP CORP.
13D/G signal
SOFTBANK GROUP CORP.
Evidence rows
50
Latest as of
31 Mar 2026
3/4/5
13D/G
13F
Lead comparable stake: 20%
13D/G row: SOFTBANK GROUP CORP.
Showing 1-8 of 50 holder rows.
Rank 1 holder
SOFTBANK GROUP CORP.
3/4/5
13D/G
13F
- Ownership
- 20%
- Position
- $44.97M
Rank 2 holder
Ayrton Capital LLC
13D/G
- Ownership
- 10%
- Position
- $3.29M
Rank 3 holder
Alyeska Investment Group, L.P.
13F
13D/G
- Ownership
- 5.2%
- Position
- $1.64M
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| SOFTBANK GROUP CORP. |
3/4/5
13D/G
13F
Director, 10%+ Owner · SB Energy Global Holdings One Ltd. · Company
|
20%
from 13D/G
|
$44,970,887
35,953,699 shares
|
— | 09 Nov 2021 |
| Ayrton Capital LLC |
13D/G
|
10%
|
$3,290,312
3,018,635 shares
|
$0 | 31 Mar 2026 |
| Alyeska Investment Group, L.P. |
13F
13D/G
Company
|
5.2%
from 13D/G
|
$1,638,000
1,400,000 shares
|
— | 31 Mar 2026 |
| Jigish Dhirajlal Trivedi |
3/4/5
COO
|
1%
|
$464,750
275,000 shares
|
— | 18 Aug 2025 |
| Anthony Rabb |
3/4/5
Chief Financial Officer
|
0.4%
|
$214,408
109,392 shares
|
— | 20 May 2025 |
| Michael R. Niggli |
3/4/5
Director
|
0.33%
|
$116,256
90,825 shares
|
— | 13 Oct 2025 |
| Raffi Garabedian |
3/4/5
Director
|
0.15%
|
$50,780
39,672 shares
|
— | 13 Oct 2025 |
| Alexi A. Wellman |
3/4/5
Director
|
0.14%
|
$49,774
38,886 shares
|
— | 13 Oct 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$12,874.
Buys
$0
Insiders: 0
Sells
$12,874
Insiders: 2
Net
-$12,874
Shares: -11,900
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 11,900
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 8,890 | $0 | $8,239 | -$8,239 |
| 3-6 | 0 | 3,010 | $0 | $4,635 | -$4,635 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 30 reporting-owner rows connected to ESS Tech, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
30
Lead holder
SOFTBANK GROUP CORP.
Net 12M change
-$12,874
Latest report
21 May 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| SOFTBANK GROUP CORP. | Director, 10%+ Owner | $44,970,887 | Mixed | 09 Nov 2021 | ||
| HONEYWELL INTERNATIONAL INC | 10%+ Owner | $20,627,886 | Mixed | 21 Sep 2023 | ||
| Craig E. Evans | President, Director | $10,533,477 | Mixed | 13 Mar 2023 | ||
| ACON S2 Sponsor, L.L.C. | 10%+ Owner | $7,629,880 | Mixed | 08 Oct 2021 | ||
| Eric P. Dresselhuys | Chief Executive Officer, Director | $943,910 | Filing P/S | 18 Nov 2024 | ||
| Amir Moftakhar | Chief Financial Officer | $699,010 | Mixed | 19 Oct 2022 | ||
| Jigish Dhirajlal Trivedi | Coo | $464,750 | Mixed | 18 Aug 2025 | ||
| Anthony Rabb | Chief Financial Officer | $214,408 | Mixed | 20 May 2025 | ||
| Kelly F. Goodman | Officer title: Chief Strategy Officer and General Counsel | $196,845 | -$8,344 | -4.1% | Filing P/S | 21 May 2026 |
| Kate Eileen Suhadolnik | Chief Financial Officer | $150,243 | -$4,530 | -2.9% | Filing P/S | 21 May 2026 |
| Michael R. Niggli | Director | $116,256 | Mixed | 13 Oct 2025 | ||
| Daryl C. Wilson | Director | $94,873 | Mixed | 01 Jun 2022 | ||
| Claudia Gast | Director | $74,665 | Mixed | 01 Jun 2022 | ||
| Jeff Bodner | Chief Accounting Officer | $68,669 | Mixed | 08 Feb 2022 | ||
| Sarah Kirshbaum Levy | Director | $62,540 | Mixed | 08 Oct 2021 | ||
| D. Shadrick Wilson | Director | $62,540 | Mixed | 08 Oct 2021 | ||
| Janie Goddard | Director | $62,540 | Mixed | 08 Oct 2021 | ||
| Raffi Garabedian | Director | $50,780 | Mixed | 13 Oct 2025 | ||
| Alexi A. Wellman | Director | $49,774 | Mixed | 13 Oct 2025 | ||
| Kyle Teamey | Director | $49,587 | Mixed | 13 Oct 2025 |
Recent insider transactions for ESS Tech, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Reported value | Reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Kate Eileen Suhadolnik | GWH | Common Stock | Sale | -1.18% | $1,796 | $0.9346 | -1,922 | 160,757 | 22 May 2026 | Direct |
| Kelly F. Goodman | GWH | Common Stock | Sale | -1.29% | $2,571 | $0.9346 | -2,751 | 210,620 | 22 May 2026 | Direct |
| Kate Eileen Suhadolnik | GWH | Common Stock | Sale | -1.06% | $1,593 | $0.9181 | -1,735 | 162,679 | 21 May 2026 | Direct |
| Kelly F. Goodman | GWH | Common Stock | Sale | -1.15% | $2,279 | $0.9181 | -2,482 | 213,371 | 21 May 2026 | Direct |
| Kate Eileen Suhadolnik | GWH | Common Stock | Sale | -0.45% | $1,141 | $1.54 | -741 | 164,414 | 20 Feb 2026 | Direct |
| Kelly F. Goodman | GWH | Common Stock | Sale | -1.04% | $3,494 | $1.54 | -2,269 | 215,853 | 20 Feb 2026 | Direct |
| Kate Eileen Suhadolnik | GWH | Common Stock | Award | 497.2% | 137,500 | 165,155 | 13 Feb 2026 | Direct | ||
| Kate Eileen Suhadolnik | GWH | Stock Option (right to buy) | Award | 137,500 | 137,500 | 13 Feb 2026 | Direct | |||
| Kelly F. Goodman | GWH | Common Stock | Award | 170.6% | 137,500 | 218,122 | 13 Feb 2026 | Direct | ||
| Kelly F. Goodman | GWH | Stock Option (right to buy) | Award | 137,500 | 137,500 | 13 Feb 2026 | Direct | |||
| Drew P. Buckley | GWH | Stock Option (right to buy) | Award | 550,000 | 550,000 | 28 Jan 2026 | Direct | |||
| Kate Eileen Suhadolnik | GWH | Common Stock | Tax liability | -4.49% | -1,299 | 27,655 | 20 Nov 2025 | Direct | ||
| Kelly F. Goodman | GWH | Common Stock | Tax liability | -5.3% | -4,513 | 80,622 | 20 Nov 2025 | Direct | ||
| Michael R. Niggli | GWH | Common Stock | Award | 17.5% | 13,513 | 90,825 | 13 Oct 2025 | Direct | ||
| Alexi Wellman | GWH | Common Stock | Award | 53.3% | 13,513 | 38,886 | 13 Oct 2025 | Direct | ||
| Harry Quarls | GWH | Common Stock | Award | 13,513 | 13,513 | 13 Oct 2025 | Direct | |||
| Sandeep Nijhawan | GWH | Common Stock | Award | 87% | 13,513 | 29,050 | 13 Oct 2025 | Direct | ||
| Raffi Garabedian | GWH | Common Stock | Award | 51.7% | 13,513 | 39,672 | 13 Oct 2025 | Direct | ||
| Rich Hossfeld | GWH | Common Stock | Award | 94.2% | 13,513 | 27,859 | 13 Oct 2025 | Direct | ||
| Kyle Teamey | GWH | Common Stock | Award | 53.6% | 13,513 | 38,740 | 13 Oct 2025 | Direct | ||
| Kate Eileen Suhadolnik | GWH | Common Stock | Tax liability | -4.08% | -1,232 | 28,954 | 20 Aug 2025 | Direct | ||
| Kelly F. Goodman | GWH | Common Stock | Tax liability | -4.84% | -4,326 | 85,135 | 20 Aug 2025 | Direct | ||
| Jigish Dhirajlal Trivedi | GWH | Common Stock | Award | 275,000 | 275,000 | 18 Aug 2025 | Direct |
* indicates a reported price that failed the local validity check.