ESS Tech, Inc. 8-K

What Happened
ESS Tech, Inc. (GWH) filed an 8-K reporting that director Michael Niggli notified the company on April 10, 2026 that he will resign from the Board of Directors, the Audit Committee and the Nominating and Corporate Governance Committee. His resignation is effective as of the company’s 2026 annual meeting of stockholders to be held on May 29, 2026. The filing states the resignation was not due to any disagreement with the company regarding its operations, policies, or practices.

Key Details

• Notification date: April 10, 2026.
• Effective date: at the 2026 annual meeting on May 29, 2026.
• Positions resigned: Board member, Audit Committee member, Nominating and Corporate Governance Committee member.
• Role: Mr. Niggli served as the Founding Chairman; company expressed gratitude for his service.

Why It Matters
Board-level changes can affect corporate governance and investor perception. Investors should note the timing (effective at the annual meeting) and that the company reported no disagreements with Mr. Niggli. Watch for any subsequent announcements about board replacements or committee reassignments ahead of or following the annual meeting.