Did ESS Tech (GWH) report any disagreement related to Rich Hossfeld’s resignation?

ESS Tech stated that Rich Hossfeld’s resignation was not the result of any disagreement with the company regarding its operations, policies, or practices. This language indicates a routine departure rather than a conflict-driven resignation.

ESS Tech director resigns; Audit Committee change

Q: What board change did ESS Tech (GWH) disclose in this 8-K?

ESS Tech disclosed that director Rich Hossfeld resigned from its board and Audit Committee effective June 12, 2026. The company also reported that Raffi Garabedian will replace him on the Audit Committee, maintaining its oversight structure.

Q: Who is joining the ESS Tech (GWH) Audit Committee after the resignation?

The company reported that Raffi Garabedian will replace Rich Hossfeld on the Audit Committee, effective June 12, 2026. This appointment helps ensure continuity in the board’s financial reporting and oversight responsibilities following the resignation.

Q: When did ESS Tech (GWH) director Rich Hossfeld’s resignation become effective?

ESS Tech reported that Rich Hossfeld notified the company of his resignation effective June 12, 2026. His departure from both the board and the Audit Committee became effective on that date according to the disclosure.

Q: Does this ESS Tech (GWH) filing discuss any financial results or transactions?

This disclosure focuses on board and Audit Committee changes rather than financial results or major transactions. It reports the resignation of director Rich Hossfeld and the appointment of Raffi Garabedian to the Audit Committee.

ESS Tech, Inc. reported a change on its board of directors.

Accepted by SEC EDGAR 06/18/2026 - 05:27 PM EDT

Filing Impact

(Moderate)

Filing Sentiment

(Neutral)How Sentiment works

Sentiment and the balance of points

Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.

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Form Type

8-K

Rhea-AI Filing Summary

ESS Tech, Inc. reported a change on its board of directors. On June 12, 2026, director Rich Hossfeld resigned from the board and from the company’s Audit Committee, effective the same day. The company states that his resignation was not due to any disagreement regarding operations, policies, or practices.

Raffi Garabedian will replace Mr. Hossfeld on the Audit Committee, also effective June 12, 2026. ESS Tech expressed appreciation for Mr. Hossfeld’s years of service and contributions.

8-K Event Classification

Item 5.02 — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers

1 item

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers Governance

Key personnel changes including departures, elections, or appointments of directors and executive officers.

Key Terms

Audit Committee, emerging growth company, Common Stock, $0.0001 par value per share

3 terms

Audit Committee financial

"Raffi Garabedian will replace Mr. Hossfeld on the Audit Committee, effective as of June 12, 2026."

A company's audit committee is a small group of board members who act like independent inspectors for the firm's finances, overseeing how financial reports are prepared, monitoring internal controls, and managing the relationship with external auditors. Investors care because a strong audit committee reduces the risk of accounting errors, fraud, or misleading statements, making financial statements more trustworthy and helping protect shareholder value.

emerging growth company regulatory

"Emerging growth company"

An emerging growth company is a recently public or smaller public firm that qualifies for temporary, lighter regulatory and disclosure rules to reduce the cost and effort of being public. For investors, it means the company may provide less historical financial detail and face fewer reporting requirements than larger firms, so it can grow more quickly but also carries higher uncertainty—like buying a promising early-stage product with fewer user reviews.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What board change did ESS Tech (GWH) disclose in this 8-K?

ESS Tech disclosed that director Rich Hossfeld resigned from its board and Audit Committee effective June 12, 2026. The company also reported that Raffi Garabedian will replace him on the Audit Committee, maintaining its oversight structure.

Who is joining the ESS Tech (GWH) Audit Committee after the resignation?

The company reported that Raffi Garabedian will replace Rich Hossfeld on the Audit Committee, effective June 12, 2026. This appointment helps ensure continuity in the board’s financial reporting and oversight responsibilities following the resignation.

When did ESS Tech (GWH) director Rich Hossfeld’s resignation become effective?

ESS Tech reported that Rich Hossfeld notified the company of his resignation effective June 12, 2026. His departure from both the board and the Audit Committee became effective on that date according to the disclosure.

Does this ESS Tech (GWH) filing discuss any financial results or transactions?

This disclosure focuses on board and Audit Committee changes rather than financial results or major transactions. It reports the resignation of director Rich Hossfeld and the appointment of Raffi Garabedian to the Audit Committee.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): June 12, 2026

ESS TECH, INC.

(Exact Name of Registrant as Specified in Charter)

Delaware

001-39525

98-1550150

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification Number)


26440 SW Parkway Ave., Bldg. 83 Wilsonville, Oregon						97070
(Address of principal executive offices)						(Zip code)

(855) 423-9920

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions:


☐			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)


☐			Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)


☐			Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))


☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange

on which registered

Common Stock, $0.0001 par value per share

GWH

The New York Stock Exchange

Warrants, each whole warrant exercisable for one share of common stock at an exercise price of $172.50

GWH.W

The New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

Resignation of Director

On June 12, 2026, Rich Hossfeld notified ESS Tech, Inc. (the “Company”) that he is resigning from the board of directors (the “Board”) of the Company and Audit Committee of the Board (the “Audit Committee”), effective as of June 12, 2026. Raffi Garabedian will replace Mr. Hossfeld on the Audit Committee, effective as of June 12, 2026.

The resignation of Mr. Hossfeld was not the result of any disagreement with the Company on any matter relating to its operations, policies, or practices.

The Company is grateful for Mr. Hossfeld’s years of service and valuable contributions to the Company.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

Dated: June 18, 2026


ESS TECH, INC.

By:			/s/ Kate Suhadolnik
Name:			Kate Suhadolnik
Title:			Chief Financial Officer

Source: View Original Filing on SEC EDGAR

Filing Exhibits & Attachments

4 documents