NIGGLI MICHAEL R - Insider Non-Derivative Transactions at ESS Tech, Inc. (GWH) - (SEC)

Updated on January 3, 2026.

According to recent SEC insider information filed on Oct 13, 2025, NIGGLI MICHAEL R's relationship to ESS Tech, Inc. (GWH) is Director, and currently has 90,825 shares of Common Stock.

The chart below shows the number of shares owned, and the table shows the recent insider transactions.

You can see similar information for other GWH insiders.

Related Topics: SEC Topic List.

Data Source: SEC.

NIGGLI MICHAEL R - Insider Non-Derivative Transactions of GWH Common Stock

NIGGLI MICHAEL R - Insider Non-Derivative Transactions at GWH

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Date	Transaction	No. of Shares	Price Per Share	Shares Owned After Transactions
Oct 14, 2025	Acquisition -- (Common Stock)	13513	0	90825
Aug 30, 2024	M -- (Common Stock)	11852	6.88	77312
May 18, 2024	Acquisition -- (Common Stock)	202702	0	951896
May 20, 2023	Acquisition -- (Common Stock)	135373	0	749194
May 17, 2023	P -- (Common Stock)	10000	0.81	613821
May 13, 2023	P -- (Common Stock)	20000	1.13	603821
Mar 7, 2023	P -- (Common Stock)	5000	1.65	583821