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

Role
Chief Financial Officer
Signature
/s/ Kate Suhadolnik
Issuer symbol
GWH
Transactions as of
13 Feb 2026
Net transactions value
$0
Form type
4
Filing time
26 Feb 2026, 21:43:13 UTC
Previous filing
21 Nov 2025
Next filing
26 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Suhadolnik Kate Eileen Chief Financial Officer C/O ESS TECH, INC., 26440 SW PARKWAY AVE., BLDG. 83, WILSONVILLE /s/ Kate Suhadolnik 26 Feb 2026 0002083724

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction GWH Common Stock Award $0 +137,500 +497% $0.000000 165,155 13 Feb 2026 Direct F1, F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction GWH Stock Option (right to buy) Award $0 +137,500 $0.000000 137,500 13 Feb 2026 Common Stock 137,500 $1.44 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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.
F2 A portion of these securities are RSUs. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock.
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.