Breakthrough Energy Ventures, LLC - Insider Trading & Ownership

Location: 4110 Carillon Point, Kirkland, WA
Signature: BREAKTHROUGH ENERGY VENTURES, LLC By: BREAKTHROUGH ENERGY INVESTMENTS, LLC, its manager By: /s/ Christian Garcia Name: Christian Garcia Title: Authorized Signatory
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Ownership of Breakthrough Energy Ventures, LLC

Symbol	Company	Relationship	Holdings Value	Past Year Net Change	Change %	Report Period
GWH, GWH-WT	ESS Tech, Inc.	10%+ Owner				Nov 9, 2021

Sym	Company	Class	Transaction	%	Value $	* Price $	Shares	Shares After	Date	Ownership

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