| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| Goodman Kelly F. | Officer title: Chief Strategy Officer and General Counsel | C/O ESS TECH, INC., 26440 SW PARKWAY AVE., BLDG. 83, WILSONVILLE | /s/ Kate Suhadolnik, by power of attorney | 26 Feb 2026 | 0002056453 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | GWH | Common Stock | Award | $0 | +137,500 | +171% | $0.000000 | 218,122 | 13 Feb 2026 | Direct | F1, F2 |
| 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 |
| 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. |
Officer title: Chief Strategy Officer and General Counsel