Plug Power Inc. filed an 8-K on September 23, 2026, disclosing that Chief Operating Officer Dean C. Fullerton notified the company on September 17, 2026, of his resignation effective October 23, 2026.

Key Highlights

  • Resignation notice: Dean C. Fullerton notified Plug Power of his intent to resign as Chief Operating Officer on September 17, 2026.
  • Effective date: The resignation is effective October 23, 2026.
  • Reason given: Fullerton is departing to accept a position at another company.
  • No disagreement stated: According to the filing, the resignation "was not due to any disagreement with the Company on any matter relating to its operations, policies, practices or otherwise known to any executive officer of the Company."
  • Transition plan: Fullerton will assist with transferring his duties to certain of the company's Executive Vice Presidents and Vice Presidents.

Plug Power Discloses COO Departure and Transition Arrangements

According to the filing, Dean C. Fullerton informed Plug Power Inc. (NASDAQ:PLUG) on September 17, 2026, that he would resign from his position as Chief Operating Officer. His last day in the role is scheduled for October 23, 2026. The company reported that Fullerton is leaving to accept a position at another company.

The filing explicitly states that the resignation was not the result of any disagreement between Fullerton and the company on matters related to operations, policies, or practices, as known to any executive officer. The company disclosed that Fullerton will help facilitate the transition of his responsibilities to certain Executive Vice Presidents and Vice Presidents during the period leading up to his departure.

The 8-K was signed by Paul Middleton, Chief Financial Officer of Plug Power Inc., on September 23, 2026. The filing was submitted under Item 5.02, which covers departures and appointments of directors and certain officers. No successor to the COO role was named in the filing.

What Was Disclosed

Plug Power disclosed the planned resignation of its Chief Operating Officer, Dean C. Fullerton, effective October 23, 2026, citing his acceptance of a role at another company, with no disagreement with the company cited as a factor.