MICHAEL R. NIGGLI - 19 May 2023 Form 4 Insider Report for ESS Tech, Inc. (GWH)

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GWH	Common Stock	Award	$0	+135,373	+22%	$0.000000	749,194	19 May 2023	Direct	F1
holding	GWH	Common Stock						85,228	19 May 2023	See footnote	F2
holding	GWH	Common Stock						85,228	19 May 2023	See footnote	F3
holding	GWH	Common Stock						85,228	19 May 2023	See footnote	F4
holding	GWH	Common Stock						568,312	19 May 2023	See footnote	F5
holding	GWH	Common Stock						227,407	19 May 2023	See footnote	F6
holding	GWH	Common Stock						85,228	19 May 2023	See footnote	F7

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Id	Content
F1	The reported shares are represented by restricted stock units, or RSUs, which vest on the earlier of (i) May 19, 2024 or (ii) the day prior to the Issuer's next annual meeting of stockholders.
F2	The shares are held of record by the Chloe D. Niggli Gift Trust for which the reporting person serves as trustee.
F3	The shares are held of record by the Michael R. Niggli Jr. 2021 Gift Trust for which the reporting person serves as trustee.
F4	The shares are held of record by the Lorelei A. Niggli 2021 Gift Trust for which the reporting person serves as trustee.
F5	The shares are held of record by the Linda Naviaux Niggli Trust for which the reporting person's spouse serves as trustee.
F6	The shares are held of record by the Michael R. Niggli Family Trust for which the reporting person serves as trustee.
F7	The shares are held of record by the Ian M. Niggli 2021 Gift Trust for which the reporting person serves as trustee.