X0306 4 2021-11-15 0 0001819438 ESS Tech, Inc. GWH 0001884662 Moftakhar Amir C/O ESS TECH, INC. 26440 SW PARKWAY AVE., BLDG. 83 WILSONVILLE OR 97070 0 1 0 0 Chief Financial Officer Common Stock 2021-11-15 4 A 0 101026 0.00 A 416614 D 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. /s/ Amir Moftakhar 2021-11-17