Michael R. Niggli - 15 Dec 2022 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	Purchase	$48,896	+19,100	+3.4%	$2.56	578,821	15 Dec 2022	Direct	F1
holding	GWH	Common Stock						568,312	15 Dec 2022	See footnote	F2
holding	GWH	Common Stock						227,407	15 Dec 2022	See footnote	F3
holding	GWH	Common Stock						85,228	15 Dec 2022	See footnote	F4
holding	GWH	Common Stock						85,228	15 Dec 2022	See footnote	F5
holding	GWH	Common Stock						85,228	15 Dec 2022	See footnote	F6
holding	GWH	Common Stock						85,228	15 Dec 2022	See footnote	F7

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

Id	Content
F1	The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.545 to $2.58, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price.
F2	The shares are held of record by the Linda Naviaux Niggli Trust for which the reporting person's spouse serves as trustee.
F3	The shares are held of record by the Michael R. Niggli Family Trust for which the reporting person serves as trustee.
F4	The shares are held of record by the Michael R. Niggli Jr. 2021 Gift Trust for which the reporting person serves as trustee.
F5	The shares are held of record by the Chloe D. Niggli Gift Trust for which the reporting person serves as trustee.
F6	The shares are held of record by the Ian M. Niggli 2021 Gift Trust for which the reporting person serves as trustee.
F7	The shares are held of record by the Lorelei A. Niggli 2021 Gift Trust for which the reporting person serves as trustee.