ESS Tech, Inc. (NYSE:GWH) Q2 2022 Earnings Conference Call August 11, 2022 5:00 PM ET Company Participants Erik Bylin - Investor Relations Eric Dresselhuys - Chief Executive Officer Amir Moftakhar - Chief Financial Officer Conference Call Participants Colin Rusch - Oppenheimer Thomas Boyes - Cowen Joseph Osha - Guggenheim Partners Operator Ladies and gentlemen, thank you for standing by. At this time, all participants are in a listening only mode. Later, we will conduct a question-and-answer session. [Opera ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______ to ________ Commission file number 001-39525 ESS Tech, Inc. (Exact name of registrant as specified in its charter) (State or other juri ...

ESS Tech, Inc. (NYSE:GWH) Q1 2022 Earnings Conference Call May 12, 2022 5:00 PM ET Company Participants Erik Bylin – Investor Relations Eric Dresselhuys – Chief Executive Officer Amir Moftakhar – Chief Financial Officer Conference Call Participants Colin Rusch – Oppenheimer Thomas Boyes – Cowen George Gianarikas – Baird Chris Kapsch – Loop Capital Markets Operator Ladies and gentlemen, thank you for standing by. At this time, all participants are in a listening only mode. Later, we will conduct a question-a ...

Table of Contents (State or other jurisdiction of incorporation or organization) 26440 SW Parkway Ave., Bldg. 83 Wilsonville, Oregon 97070 (Address of Principal Executive Offices) (Zip Code) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _______ to ________ Commission file number 001-39525 ESS Tech, Inc. (Exact name of registrant as specified in its charter) (State or other jurisd ...

ESS Tech, Inc. (NYSE:GWH) Q4 2021 Earnings Conference Call February 24, 2022 5:00 PM ET Company Participants Eric Dresselhuys – Chief Executive Officer Amir Moftakhar – Chief Financial Officer Conference Call Participants Jed Dorsheimer – Canaccord Genuity Colin Rusch – Oppenheimer Thomas Boyd – Cowen and Company Jayson Osha – Guggenheim Operator Ladies and gentlemen, thank you for standing by. At this time, all participants are in a listen-only mode. Later, we will conduct a question-and-answer session. ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 For the quarterly period ended September 30, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-39525 ESS TECH, INC (Exact name of registrant as specified in its charter) Delaware 98-1550150 (State or other jurisdiction of incorporation or organization) FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTIO ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-39525 ACON S2 ACQUISITION CORP. (Exact name of registrant as specified in its charter) Cayman Islands 98-1550150 (State or other ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to ACON S2 Acquisition Corp. (Exact name of registrant as specified in its charter) | (Exact name of registrant as specified in its charter) | | | | | | --- | --- | - ...

(Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-39525 ACON S2 ACQUISITION CORP. (Exact name of registrant as specified in its charter) Cayman Islands 98-1550150 (State or ...