Kate Eileen Suhadolnik - 01 Aug 2025 Form 3 Insider Report for ESS Tech, Inc. (GWH)

Role: Interim CFO
Signature: /s/ Bianca Boschmans, by power of attorney
Issuer symbol: GWH
Transactions as of: 01 Aug 2025
Net transactions value: $0
Form type: 3
Filing time: 28 Aug 2025, 18:24:03 UTC
Next filing: 29 Aug 2025
SEC: View on sec.gov

Quoteable Key Fact

"Kate Eileen Suhadolnik filed Form 3 for ESS Tech, Inc. (GWH) on 28 Aug 2025."

Quick Takeaways

This page summarizes Kate Eileen Suhadolnik's Form 3 filing for ESS Tech, Inc. (GWH).
0 reported transactions and 0 derivative rows are listed below.
Filing timestamp: 28 Aug 2025, 18:24.

What Changed

No earlier filing in this sequence is available for direct comparison.
Current net transaction value: $0.

Why This Matters

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Source Evidence

Official SEC Source

Ownership activity is grounded in SEC Form 3 disclosures.

See Original Filing

Reporting Owners (1)

CIK 0002083724 Primary reporting owner

Suhadolnik Kate Eileen

Relationship: Interim CFO
Address: C/O ESS TECH, INC., 26440 SW PARKWAY AVE., BLDG. 83, WILSONVILLE
Signature: /s/ Bianca Boschmans, by power of attorney
Signature date: 28 Aug 2025

Transactions Table

GWH holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 30,186
Date: 01 Aug 2025
Ownership: Direct
Footnotes: F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Of the reported shares, 23,805 are represented by restricted stock units, or RSUs, awarded prior to the date on which the reporting person became subject to Section 16. An award representing 394 RSUs was awarded on December 23, 2021. The remaining 48 RSUs vest in two equal quarterly installments beginning on August 20, 2025. An award representing 184 RSUs was awarded on February 8, 2022. The remaining 33 RSUs vest in three equal quarterly installments beginning on August 20, 2025. An award representing 821 RSUs was awarded on November 2, 2022. The remaining 128 RSUs vest in two equal quarterly installments beginning on August 20, 2025.
F2	An award representing 5,351 RSUs was awarded on March 13, 2023. The remaining 2,338 RSUs vest in seven equal quarterly installments beginning on August 20, 2025. An award representing 5,867 RSUs was awarded on February 15, 2024. The remaining 4,032 RSUs vest in eleven equal quarterly installments beginning on August 20, 2025. An award representing 18,375 RSUs was awarded on April 13, 2025. The remaining 17,226 RSUs vest in fifteen equal quarterly installments beginning on August 20, 2025.

Content

Of the reported shares, 23,805 are represented by restricted stock units, or RSUs, awarded prior to the date on which the reporting person became subject to Section 16. An award representing 394 RSUs was awarded on December 23, 2021. The remaining 48 RSUs vest in two equal quarterly installments beginning on August 20, 2025. An award representing 184 RSUs was awarded on February 8, 2022. The remaining 33 RSUs vest in three equal quarterly installments beginning on August 20, 2025. An award representing 821 RSUs was awarded on November 2, 2022. The remaining 128 RSUs vest in two equal quarterly installments beginning on August 20, 2025.

An award representing 5,351 RSUs was awarded on March 13, 2023. The remaining 2,338 RSUs vest in seven equal quarterly installments beginning on August 20, 2025. An award representing 5,867 RSUs was awarded on February 15, 2024. The remaining 4,032 RSUs vest in eleven equal quarterly installments beginning on August 20, 2025. An award representing 18,375 RSUs was awarded on April 13, 2025. The remaining 17,226 RSUs vest in fifteen equal quarterly installments beginning on August 20, 2025.

Remarks:

Exhibit 24.1 Power of Attorney