ACON S2 Acquisition Corp

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ACON S2 Acquisition Corp
TickerGWH
CIK #0001819438
CUSIP26916J205
SectorReal Estate & Construction - Blank Checks
Addressc/o Walkers Corporate Limited Cayman Corporate Centre - 27 Hospital Rd, George Town, KY1-9008
Source [EDGAR]
Reg D Offering (Form D) Filed Raised Terms
ESS Tech Inc 2025-07-23 0.9 M Exemption: 506(b) · Minimum: $585,000 · Duration: One year or less · Revenue: Decline to Disclose
CIK Filing 2011 - 2026
[0001819438] 10-K
[0001819438] 10-Q
[0001819438] 3
[0001819438] 4
[0001819438] 8-K
[0001819438] D
[0001819438] SC 13D
[0001819438] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
Ayrton Capital LLC ESS Tech Inc [2026-05-11] 0.0
Alyeska Investment Group LP ESS Tech Inc [2026-02-17] 0.0
Honeywell International Inc ESS Tech Inc [2023-09-25] 18.0
Evans Craig E ESS Tech Inc [2023-07-13] 5.5
Cycle Capital Fund III LP ESS Tech Inc [2023-03-29] 6.3
FMR LLC ESS Tech Inc [2022-02-09] 0.0
Softbank Group Corp ESS Tech Inc [2021-10-25] 23.5
Pangaea Ventures Fund III LP ESS Tech Inc [2021-10-21] 8.02
BASF Venture Capital GmbH ESS Tech Inc [2021-10-20] 5.9
Breakthrough Energy Investments LLC ESS Tech Inc [2021-10-18] 11.87
Cycle Capital Fund III LP ESS Tech Inc [2021-10-18] 7.2
RP Investment Advisors LP ACON S2 Acquisition Corp [2021-03-30] 5.14
Glazer Capital LLC ACON S2 Acquisition Corp [2021-02-16] 8.5
ACON S2 Sponsor LLC ACON S2 Acquisition Corp [2021-02-12] 19.5
Weiss Asset Management LP ACON S2 Acquisition Corp [2020-09-25] 8.0
Form 3/4/5 Filer 2011 - 2026
ESS Tech Inc
Buckley Drew P
Garabedian Raffi
Nijhawan Sandeep
Hossfeld Rich
Wellman Alexi
Quarls Harry
Suhadolnik Kate Eileen
Goodman Kelly F
Niggli Michael R
Teamey Kyle
Rabb Anthony
Dresselhuys Eric P
Honeywell International Inc
Evans Craig E
Moftakhar Amir
Song Julia
Gast Claudia
Wilson Daryl C
Bodner Jeff
Breakthrough Energy Investments LLC
Breakthrough Energy Ventures LLC
Softbank Group Corp
Speakman Shirley
ACON S2 Sponsor LLC
Jinich Daniel
Goddard Janie
Ginns Jonathan J
Roush John A
Shadrick-Wilson Ryan D
Levy Sarah Kirshbaum
Kriger Adam M
Insider Transaction (Form 3/4/5) Date Action Shares Price Value ($)
Suhadolnik Kate Eileen
Common Stock
2026-02-20 Sell 741 $1.54 1,141
Goodman Kelly F
Common Stock
2026-02-20 Sell 2,269 $1.54 3,494
Suhadolnik Kate Eileen
Common Stock
2026-02-13 Grant 137,500 $0.00
Goodman Kelly F
Common Stock
2026-02-13 Grant 137,500 $0.00
Suhadolnik Kate Eileen
Stock Option (right to buy) · derivative
2026-02-13 Grant 137,500 $0.00
Goodman Kelly F
Stock Option (right to buy) · derivative
2026-02-13 Grant 137,500 $0.00
Buckley Drew P
Stock Option (right to buy) · derivative
2026-01-28 Grant 550,000 $0.00
Suhadolnik Kate Eileen
Common Stock
2025-11-20 Tax withheld 1,299 $2.40 3,118
Goodman Kelly F
Common Stock
2025-11-20 Tax withheld 4,513 $2.40 10,831
Niggli Michael R
Common Stock
2025-10-13 Grant 13,513 $0.00
Wellman Alexi
Common Stock
2025-10-13 Grant 13,513 $0.00
Quarls Harry
Common Stock
2025-10-13 Grant 13,513 $0.00
Nijhawan Sandeep
Common Stock
2025-10-13 Grant 13,513 $0.00
Garabedian Raffi
Common Stock
2025-10-13 Grant 13,513 $0.00
Hossfeld Rich
Common Stock
2025-10-13 Grant 13,513 $0.00
Teamey Kyle
Common Stock
2025-10-13 Grant 13,513 $0.00
Common Stock
2025-08-20 Tax withheld 1,232 $1.61 1,984
Common Stock
2025-08-20 Tax withheld 4,326 $1.61 6,965
Common Stock
2025-08-18 Grant 275,000 $0.00
Rabb Anthony
Common Stock
2025-05-20 Tax withheld 2,741 $1.96 5,372
showing 20 of 156 most recent transactions
13F Ownership Over TimeHoldersShares Held
2026-03-31 51 7,610,076
2025-12-31 55 6,356,236
2025-09-30 46 3,745,730
2025-06-30 50 3,023,670
2025-03-31 46 3,367,429
2024-12-31 57 3,480,919
2024-09-30 51 3,269,965
2024-06-30 104 87,800,989
2024-03-31 106 57,135,894
2023-12-31 109 61,414,158
2023-09-30 104 96,768,375
2023-06-30 93 59,235,640
Form 13F Holdings
Firm Period DFND Voting Shares
Wolff Wiese Magana LLC [2026-06-30] SOLE 66 66
Harbor Investment Advisory LLC [2026-06-30] SOLE 33 33
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