Comparable stake leader
SOFTBANK GROUP CORP.
SEC ownership of ESS Tech, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001819438.
Disclosed value leader
SOFTBANK GROUP CORP.
Comparable rows
50/50
Latest evidence
29 May 2026
- Public ticker
- GWH, GWH-WT on NYSE
- Parsed ownership sources
-
3/4/5, 13D/G, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
SOFTBANK GROUP CORP.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
SOFTBANK GROUP CORP.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
29 May 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001819438
- Issuer location
- Wilsonville, OR
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
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.
Comparable stake leader
SOFTBANK GROUP CORP.
Disclosed value leader
SOFTBANK GROUP CORP.
Comparable rows
50/50
Latest evidence
29 May 2026
3/4/5
13D/G
13F
Lead comparable stake: 20%
13D/G row: SOFTBANK GROUP CORP.
Showing 1-8 of 50 holder rows.
Quick read
SOFTBANK GROUP CORP. leads the comparable SEC ownership view at 20%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens SOFTBANK GROUP CORP.'s linked filing trail.
Comparable ownership
Top 5
SOFTBANK GROUP CORP.
20%
Ayrton Capital LLC
10%
Alyeska Investment Group, L.P.
5.2%
Jigish Dhirajlal Trivedi
1%
Anthony Rabb
0.4%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| 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 |
| Harry Quarls |
3/4/5
Director
|
0.25%
|
$80,459
68,769 shares
|
— | 29 May 2026 |
| Raffi Garabedian |
3/4/5
Director
|
0.2%
|
$62,226
53,185 shares
|
— | 29 May 2026 |
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 buying over the last 12 months. Net value: +$12,786.
Buys
$25,660
Insiders: 1
Sells
$12,874
Insiders: 2
Net
+$12,786
Shares: +13,100
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 25,000
Shares: 11,900
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 25,000 | 8,890 | $25,660 | $8,239 | +$17,421 |
| 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
Largest Forms 3/4/5 holder
SOFTBANK GROUP CORP.
Net 12M change
+$12,786
Latest report
04 Jun 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 | ||
| Harry Quarls | Director | $80,459 | Median | 29 May 2026 | ||
| Claudia Gast | Director | $74,665 | Mixed | 01 Jun 2022 | ||
| Jeff Bodner | Chief Accounting Officer | $68,669 | Mixed | 08 Feb 2022 | ||
| D. Shadrick Wilson | Director | $62,540 | Mixed | 08 Oct 2021 | ||
| Sarah Kirshbaum Levy | Director | $62,540 | Mixed | 08 Oct 2021 | ||
| Janie Goddard | Director | $62,540 | Mixed | 08 Oct 2021 | ||
| Raffi Garabedian | Director | $62,226 | Median | 29 May 2026 | ||
| Alexi Wellman | Director | $61,306 | Median | 29 May 2026 |
Recent insider transactions for ESS Tech, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Drew P. Buckley | GWH | Common Stock | Purchase | $25,660 | $1.03 | 25,000 | 25,000 | 04 Jun 2026 | Direct | |
| Alexi Wellman | GWH | Common Stock | Award | 34.8% | 13,513 | 52,399 | 29 May 2026 | Direct | ||
| Harry Quarls | GWH | Common Stock | Award | 24.5% | 13,513 | 68,769 | 29 May 2026 | Direct | ||
| Sandeep Nijhawan | GWH | Common Stock | Award | 46.5% | 13,513 | 42,563 | 29 May 2026 | Direct | ||
| Rich Hossfeld | GWH | Common Stock | Award | 48.5% | 13,513 | 41,372 | 29 May 2026 | Direct | ||
| Raffi Garabedian | GWH | Common Stock | Award | 34.1% | 13,513 | 53,185 | 29 May 2026 | Direct | ||
| 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 |
* marks a reported price that did not pass the local price check.