Birchtech Corp. filed 2 current reports with the SEC under Item 5.02, which covers directors and officers leaving or being appointed, the latest on 2026-05-12. Between them they name 3 people, with 2 appointments and 1 departure. Each change below is quoted from the filing and linked to it.
Every change, newest first
Reported
The arrangement has an indefinite term and is subject to the applicable notice and termination provisions.
Departing: Fiona Fitzmaurice, Chief Financial Officer
Item 5.02(b) - Departure of Chief Financial Officer On May 1, 2026, Fiona Fitzmaurice ceased serving as Chief Financial Officer of Birchtech Corp. (the "Company") following notice from the Company on that date.
Appointed: Michael Mioska, Chief Financial Officer, effective 2026-05-01
Item 5.02(c) - Appointment of Chief Financial Officer and Chief Operating Officer Effective May 1, 2026, the Company appointed Michael Mioska as its Chief Financial Officer.
Appointed: James Trettel, Chief Operating Officer
In addition, on May 1, 2026, the Company appointed James Trettel as its Chief Operating Officer, and in connection with his appointment, he ceased serving as Executive Vice President of Operations.
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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.