Kate Eileen Suhadolnik - 13 Feb 2026 Form 4 Insider Report for ESS Tech, Inc. (GWH)

Reporting relationship: Chief Financial Officer
Issuer ticker: GWH
Reported as of: 13 Feb 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 26 Feb 2026, 21:43:13 UTC
Prior SEC filing: 21 Nov 2025
Next 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 Feb 2026.

Key facts

This page summarizes Kate Eileen Suhadolnik's Form 4 filing for ESS Tech, Inc. (GWH).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 26 Feb 2026, 21:43.

Change

Previous filing in this sequence was filed on 21 Nov 2025.
Current net transaction value: $0.

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 Feb 2026

Reported non-derivative transactions

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

GWH transaction

Common Stock

Award

Transaction value: $0
Shares: +137,500
Change %: +497%
Price: $0.000000
Shares after: 165,155
Date: 13 Feb 2026
Ownership: Direct
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

GWH transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +137,500
Change %
Price: $0.000000
Shares after: 137,500
Date: 13 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 137,500
Exercise price: $1.44
Footnotes: F3

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

The reported shares are represented by restricted stock units ("RSUs"), which vest as to 1/16th of the RSUs on May 20, 2026 and 1/16th of the RSUs shall vest quarterly thereafter, subject to the Reporting Person remaining a Service Provider to the Issuer through each such vest date.

Footnote F2

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

Footnote F3

1/16th of the shares subject to the option shall vest on May 20, 2026 and 1/16th of the shares subject to the option shall vest quarterly thereafter, subject to the Reporting Person remaining a Service Provider to the issuer through each such vest date.