ESS Tech, Inc. (GWH) Insider Ownership

Historic Insider Ownership Trends

GWH's three largest insider shareholders as of March 23, 2026 are Group Corp Softbank (Director, 35.95Mn shares), Energy Ventures, Llc Breakthrough (TenPercentOwner, 18.56Mn shares), S2 Sponsor, L.L.C. Acon (TenPercentOwner, 6.10Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Group Corp Softbank 0 35,953,699 12 Nov, 2021
Energy Ventures, Llc Breakthrough 18,558,721 0 12 Nov, 2021
S2 Sponsor, L.L.C. Acon 6,100,000 0 13 Oct, 2021
Craig E Evans President 5,561,524 0 23 Feb, 2023
Craig E Evans President 0 2,859,868 14 Mar, 2023
Michael R Niggli 0 568,302 17 Nov, 2021
Amir Moftakhar Chief Financial Officer 558,850 0 20 Oct, 2022
Jigish Dhirajlal Trivedi Coo 275,000 0 05 Sep, 2025
Kelly F. Goodman See Remarks 215,853 0 26 Feb, 2026
Eric P. Dresselhuys Chief Executive Officer 180,580 0 18 Nov, 2024
Kate Eileen Suhadolnik Chief Financial Officer 164,414 0 26 Feb, 2026
Anthony Rabb Chief Financial Officer 109,392 0 22 May, 2025
Michael R Niggli 90,825 0 15 Oct, 2025
Daryl C Wilson 75,850 0 02 Jun, 2022
Claudia Gast 59,694 0 02 Jun, 2022
Jeff Bodner Chief Accounting Officer 54,900 0 09 Feb, 2022
Ryan D Shadrick-Wilson 50,000 0 12 Oct, 2021
Sarah Kirshbaum Levy 50,000 0 13 Oct, 2021
Janie Goddard 50,000 0 13 Oct, 2021
Raffi Garabedian 39,672 0 15 Oct, 2025
Alexi Wellman 38,886 0 15 Oct, 2025
Kyle Teamey 38,740 0 15 Oct, 2025
Sandeep Nijhawan 29,050 0 15 Oct, 2025
Rich Hossfeld 27,859 0 15 Oct, 2025
Harry Quarls 13,513 0 15 Oct, 2025

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
13 Feb, 2026 Kate Eileen Suhadolnik Common Stock A 137,500 $0.00 165,155 D A
20 Feb, 2026 Kelly F. Goodman Common Stock D 2,269 $1.54 215,853 D S
13 Feb, 2026 Kelly F. Goodman Common Stock A 137,500 $0.00 218,122 D A
20 Feb, 2026 Kate Eileen Suhadolnik Common Stock D 741 $1.54 164,414 D S
13 Feb, 2026 Kate Eileen Suhadolnik Stock Option (right to buy) A 137,500 $0.00 137,500 D A
13 Feb, 2026 Kelly F. Goodman Stock Option (right to buy) A 137,500 $0.00 137,500 D A
28 Jan, 2026 Drew P Buckley Stock Option (right to buy) A 550,000 $0.00 550,000 D A
20 Nov, 2025 Kelly F. Goodman Common Stock D 4,513 $2.40 80,622 D F
20 Nov, 2025 Kate Eileen Suhadolnik Common Stock D 1,299 $2.40 27,655 D F
13 Oct, 2025 Raffi Garabedian Common Stock A 13,513 $0.00 39,672 D A
13 Oct, 2025 Alexi Wellman Common Stock A 13,513 $0.00 38,886 D A
13 Oct, 2025 Kyle Teamey Common Stock A 13,513 $0.00 38,740 D A
13 Oct, 2025 Michael R Niggli Common Stock A 13,513 $0.00 90,825 D A
13 Oct, 2025 Sandeep Nijhawan Common Stock A 13,513 $0.00 29,050 D A
13 Oct, 2025 Rich Hossfeld Common Stock A 13,513 $0.00 27,859 D A
13 Oct, 2025 Harry Quarls Common Stock A 13,513 $0.00 13,513 D A
18 Aug, 2025 Jigish Dhirajlal Trivedi Common Stock A 275,000 $0.00 275,000 D A
20 Aug, 2025 Kate Eileen Suhadolnik Common Stock D 1,232 $1.61 28,954 D F
20 Aug, 2025 Kelly F. Goodman Common Stock D 4,326 $1.61 85,135 D F
20 May, 2025 Kelly F. Goodman Common Stock D 2,164 $1.96 89,461 D F