NIGGLI MICHAEL R

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Earnings

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PS: Planned sale, O: Option / Other

Notification date	Transaction date	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value	Details
2023-05-17	2023-05-16	ESS Tech Inc (GWH)	B Purchase	10,000 +1.7% 0.81 USD 8,104	10,000 +1.7%	0.81	USD 8,104
2023-05-15	2023-05-12	ESS Tech Inc (GWH)	B Purchase	20,000 +3.4% 1.13 USD 22,592	20,000 +3.4%	1.13	USD 22,592
2023-03-07	2023-03-06	ESS Tech Inc (GWH)	B Purchase	5,000 +0.9% 1.65 USD 8,250	5,000 +0.9%	1.65	USD 8,250
2022-12-16	2022-12-15	ESS Tech Inc (GWH)	B Purchase	19,100 +3.4% 2.56 USD 48,896	19,100 +3.4%	2.56	USD 48,896
2022-03-03	2022-03-01	ESS Tech Inc (GWH)	B Purchase	20,000 +3.9% 5.01 USD 100,168	20,000 +3.9%	5.01	USD 100,168