As of September 29, 2026, the three largest insider holders of GWH are Group Corp Softbank (Director, 2.40Mn shares), Energy Ventures, Llc Breakthrough (TenPercentOwner, 1.24Mn shares), S2 Sponsor, L.L.C. Acon (TenPercentOwner, 406.69K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Group Corp Softbank | Director, TenPercentOwner | 0 | 2,397,033 | 2,397,033 | 42.6% | 12 Nov, 2021 |
| 2 | Energy Ventures, Llc Breakthrough | TenPercentOwner | 1,237,310 | 0 | 1,237,310 | 22.0% | 12 Nov, 2021 |
| 3 | S2 Sponsor, L.L.C. Acon | TenPercentOwner | 406,687 | 0 | 406,687 | 7.2% | 13 Oct, 2021 |
| 4 | Jigish Dhirajlal Trivedi | Coo | 275,000 | 0 | 275,000 | 4.9% | 05 Sep, 2025 |
| 5 | Kelly F. Goodman | Interim Ceo | 205,220 | 0 | 205,220 | 3.6% | 24 Aug, 2026 |
| 6 | Craig E Evans | President | 0 | 190,667 | 190,667 | 3.4% | 14 Mar, 2023 |
| 7 | Eric P. Dresselhuys | Chief Executive Officer | 180,580 | 0 | 180,580 | 3.2% | 18 Nov, 2024 |
| 8 | Kate Eileen Suhadolnik | Chief Financial Officer | 156,830 | 0 | 156,830 | 2.8% | 24 Aug, 2026 |
| 9 | Anthony Rabb | Chief Financial Officer | 109,392 | 0 | 109,392 | 1.9% | 22 May, 2025 |
| 10 | Michael R Niggli | Director | 90,825 | 0 | 90,825 | 1.6% | 15 Oct, 2025 |
| 11 | Harry Quarls | Director | 68,769 | 0 | 68,769 | 1.2% | 02 Jun, 2026 |
| 12 | Raffi Garabedian | Director | 53,185 | 0 | 53,185 | 0.9% | 02 Jun, 2026 |
| 13 | Alexi Wellman | Director | 52,399 | 0 | 52,399 | 0.9% | 02 Jun, 2026 |
| 14 | Sandeep Nijhawan | Director | 42,563 | 0 | 42,563 | 0.8% | 02 Jun, 2026 |
| 15 | Rich Hossfeld | Director | 41,372 | 0 | 41,372 | 0.7% | 02 Jun, 2026 |
| 16 | Kyle Teamey | Director | 38,740 | 0 | 38,740 | 0.7% | 15 Oct, 2025 |
| 17 | Amir Moftakhar | Chief Financial Officer | 37,259 | 0 | 37,259 | 0.7% | 20 Oct, 2022 |
| 18 | Drew P Buckley | Ceo | 25,000 | 0 | 25,000 | 0.4% | 08 Jun, 2026 |
| 19 | Daryl C Wilson | Director | 5,057 | 0 | 5,057 | 0.1% | 02 Jun, 2022 |
| 20 | Claudia Gast | Director | 3,980 | 0 | 3,980 | 0.1% | 02 Jun, 2022 |
| 21 | Jeff Bodner | Chief Accounting Officer | 3,660 | 0 | 3,660 | 0.1% | 09 Feb, 2022 |
| 22 | Janie Goddard | Director | 3,334 | 0 | 3,334 | 0.1% | 13 Oct, 2021 |
| 23 | Ryan D Shadrick-Wilson | Director | 3,334 | 0 | 3,334 | 0.1% | 12 Oct, 2021 |
| 24 | Sarah Kirshbaum Levy | Director | 3,334 | 0 | 3,334 | 0.1% | 13 Oct, 2021 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 21 Aug, 2026 | Kate Eileen Suhadolnik | Chief Financial Officer | Disposed S | 3,927 | $0.40 | $1.58K | 156,830 | Direct |
| 21 Aug, 2026 | Kelly F. Goodman | Officer | Disposed S | 5,400 | $0.40 | $2.17K | 205,220 | Direct |
| 04 Jun, 2026 | Drew P Buckley | Ceo | Acquired P | 25,000 | $1.03 | $25.66K | 25,000 | Direct |
| 29 May, 2026 | Alexi Wellman | Director | Acquired A | 13,513 | $0.00 | $0 | 52,399 | Direct |
| 29 May, 2026 | Raffi Garabedian | Director | Acquired A | 13,513 | $0.00 | $0 | 53,185 | Direct |
| 29 May, 2026 | Harry Quarls | Director | Acquired A | 13,513 | $0.00 | $0 | 68,769 | Direct |
| 29 May, 2026 | Sandeep Nijhawan | Director | Acquired A | 13,513 | $0.00 | $0 | 42,563 | Direct |
| 29 May, 2026 | Rich Hossfeld | Director | Acquired A | 13,513 | $0.00 | $0 | 41,372 | Direct |
| 21 May, 2026 | Kelly F. Goodman | Officer | Disposed S | 2,482 | $0.92 | $2.28K | 213,371 | Direct |
| 21 May, 2026 | Kate Eileen Suhadolnik | Chief Financial Officer | Disposed S | 1,735 | $0.92 | $1.59K | 162,679 | Direct |
| 22 May, 2026 | Kate Eileen Suhadolnik | Chief Financial Officer | Disposed S | 1,922 | $0.93 | $1.80K | 160,757 | Direct |
| 22 May, 2026 | Kelly F. Goodman | Officer | Disposed S | 2,751 | $0.93 | $2.57K | 210,620 | Direct |
| 13 Feb, 2026 | Kelly F. Goodman | Officer | Acquired A | 137,500 | $0.00 | $0 | 218,122 | Direct |
| 20 Feb, 2026 | Kate Eileen Suhadolnik | Chief Financial Officer | Disposed S | 741 | $1.54 | $1.14K | 164,414 | Direct |
| 13 Feb, 2026 | Kate Eileen Suhadolnik | Chief Financial Officer | Acquired A | 137,500 | $0.00 | $0 | 165,155 | Direct |
| 20 Feb, 2026 | Kelly F. Goodman | Officer | Disposed S | 2,269 | $1.54 | $3.49K | 215,853 | Direct |
| 13 Feb, 2026 | Kelly F. Goodman | Officer | Acquired A | 137,500 | $0.00 | $0 | 137,500 | Direct |
| 13 Feb, 2026 | Kate Eileen Suhadolnik | Chief Financial Officer | Acquired A | 137,500 | $0.00 | $0 | 137,500 | Direct |
| 28 Jan, 2026 | Drew P Buckley | Ceo | Acquired A | 550,000 | $0.00 | $0 | 550,000 | Direct |
| 20 Nov, 2025 | Kelly F. Goodman | Interim Ceo | Disposed F | 4,513 | $2.40 | $10.83K | 80,622 | Direct |