Rich Hossfeld left the role of Director at ESS Tech, Inc., effective June 12, 2026. As of November 6, 2026, ESS Tech, Inc. has reported 2 leadership change filings to the SEC under Item 5.02 of Form 8-K, from April 15, 2026 to June 18, 2026, naming 2 departures (Form 8-K, June 18, 2026).
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ESS Tech, Inc. reported changes in 2 filings among its directors and officers to the SEC on Form 8-K, Item 5.02, from 2026-04-15 to 2026-06-18. They name 2 people. Every row below is cited to the filing it comes from, and this page adds each new change as ESS Tech, Inc. files it.
Also on the record for ESS Tech, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| August 14, 2026 | Stake report, Schedule 13G/A, by Alyeska Investment Group, L.P. | 4.76% of the class | 5%+ stakes | Source |
| August 13, 2026 | Stake report, Schedule 13G/A, by Ayrton Capital LLC | 8.14% of the class | 5%+ stakes | Source |
| May 15, 2026 | Stake report, Schedule 13G/A, by Alyeska Investment Group, L.P. | 5.15% of the class | 5%+ stakes | Source |
| May 11, 2026 | Stake report, Schedule 13G, by Ayrton Capital LLC | 9.99% of the class | 5%+ stakes | Source |
| February 17, 2026 | Stake report, Schedule 13G, by Alyeska Investment Group, L.P. | 7.14% of the class | 5%+ stakes | Source |
| July 23, 2025 | Form D, private offering | $900K sold | Form D page | Source |
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More on ESS Tech, Inc. and the records around it.
ESS Tech, Inc. elsewhere on the record
- 5%+ stake filings Aug 2026
- Form D filing Jul 2025
Companies that share a holder
- Ayrton Capital LLC also filed stake reports on 31 other companies: Bluejay Diagnostics, Inc. (Aug 2026), BTC Digital Ltd. (Aug 2026), DEFSEC Technologies Inc. (Aug 2026)
- Alyeska Investment Group, L.P. also filed stake reports on 81 other companies: ABUNDIA GLOBAL IMPACT GROUP, INC. (Aug 2026), Bakkt, Inc. (Aug 2026), BATTALION OIL CORP (Aug 2026)
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Timeline
| Filed | In / out | Person | Role | Effective | Source |
|---|---|---|---|---|---|
| 2026-06-18 | Out | Director | 2026-06-12 | 8-K, 2026-06-18 | |
| 2026-04-15 | Out | 8-K, 2026-04-15 |
Who leads ESS Tech, Inc., as last reported?
For each role that changed in the filings below, the most recent change reported. A role that did not change in these filings is not listed.
- Director: Rich Hossfeld, departure reported, effective 2026-06-12 (filed 2026-06-18). No successor is named in these filings.
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Find candidates like Director at ESS Tech, Inc.Every change, in the filing's words
Departing: Rich Hossfeld, Director, effective 2026-06-12
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.
Departing: Michael Niggli
On April 10, 2026, Michael Niggli notified ESS Tech, Inc. (the "Company") that he is resigning from the Company's Board of Directors (the "Board"), Audit Committee and Nominating and Corporate Governance Committee, effective as of the date of the Company's 2026 annual meeting of stockholders to be held on May 29, 2026.
- The resignation of Mr. Niggli 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. Niggli's leadership on its board of directors as the Founding Chairman of the Company and for his years of service and valuable contributions to the Company.
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.