X0306 4 2022-01-17 0 0001819438 ESS Tech, Inc. GWH 0001885331 Evans Craig E C/O ESS TECH, INC. 26440 SW PARKWAY AVE., BLDG. 83 WILSONVILLE OR 97070 1 1 0 0 President 0001884681 Song Julia C/O ESS TECH, INC. 26440 SW PARKWAY AVE., BLDG. 83 WILSONVILLE OR 97070 0 1 0 0 Chief Technology Officer Common Stock 2022-01-17 4 A 0 2934 0.00 A 5374425 D Common Stock 2258627 I See Footnote. The shares are represented by restricted stock units, or RSUs, awarded upon the satisfaction of certain performance metrics as determined by the Compensation Committee. The RSUs were fully vested on the award date. The shares are held directly by Julia Song. The reporting persons are husband and wife. /s/ Amir Moftakhar, by power of attorney for Craig E. Evans 2022-01-19 /s/ Amir Moftakhar, by power of attorney for Craig E. Evans 2022-01-19