Plug Power Inc. COO Dean Fullerton Resigns Effective Oct 23, 2026

What Happened
Plug Power Inc. filed a Form 8-K (Item 5.02) reporting that Dean C. Fullerton notified the company on September 17, 2026 that he will resign as Chief Operating Officer, effective October 23, 2026, to accept a position at another company. The filing states his resignation is not due to any disagreement with the company regarding operations, policies or practices. Mr. Fullerton will assist with the transition of his duties to certain Executive Vice Presidents and Vice Presidents.

Key Details

• Notification date: September 17, 2026.
• Effective resignation date: October 23, 2026.
• Position: Chief Operating Officer (COO) Dean C. Fullerton.
• Reason: Accepting a position at another company; not due to any disagreement with Plug Power.
• Transition plan: Mr. Fullerton will help transfer responsibilities to existing Executive VPs and VPs.

Why It Matters
This is a material executive change reported under Item 5.02. A COO departure can affect operations and execution oversight, but the company indicates an internal transition plan and that the exit is not dispute-related, which may reduce governance concerns. The filing does not name a successor or detail any changes to compensation or governance; investors may watch subsequent announcements for a formal replacement and any operational impacts.