Kate Eileen Suhadolnik - 21 May 2026 Form 4 Insider Report for ESS Tech, Inc. (GWH)

Reporting relationship: Chief Financial Officer
Issuer ticker: GWH
Reported as of: 21 May 2026
Net transaction value: -$3,389
SEC form: 4
Accepted by SEC: 26 May 2026, 18:59:01 UTC
Prior SEC filing: 26 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ Kate Suhadolnik

Key filing fact

Kate Eileen Suhadolnik filed Form 4 for ESS Tech, Inc. (GWH) on 26 May 2026.

Key facts

This page summarizes Kate Eileen Suhadolnik's Form 4 filing for ESS Tech, Inc. (GWH).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 26 May 2026, 18:59.

Change

Previous filing in this sequence was filed on 26 Feb 2026.
Current net transaction value: -$3,389.

Research use

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.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002083724 Primary reporting owner

Suhadolnik Kate Eileen

Relationship: Chief Financial Officer
Address: C/O ESS TECH, INC., 26440 SW PARKWAY AVE., BLDG. 83, WILSONVILLE
Signature: /s/ Kate Suhadolnik
Signature date: 26 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

GWH transaction

Common Stock

Sale

Transaction value: $1,593
Shares: -1,735
Change %: -1.1%
Price: $0.9181
Shares after: 162,679
Date: 21 May 2026
Ownership: Direct
Footnotes: F1, F2, F3

GWH transaction

Common Stock

Sale

Transaction value: $1,796
Shares: -1,922
Change %: -1.2%
Price: $0.9346
Shares after: 160,757
Date: 22 May 2026
Ownership: Direct
Footnotes: F1, F3, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

These shares were sold to cover tax withholding obligations in connection with the vesting of restricted stock units ("RSUs").

Footnote F2

The price reported in sold Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.9024 to $0.971, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Footnote F3

A portion of these securities are RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock.

Footnote F4

The price reported in sold Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $0.92 to $0.95, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.