8-K filed May 6, 2026, 7:59 PM ET ticker BCHT CIK 0000728385

leadership confidence high sentiment neutral materiality 0.60

Birchtech appoints Michael Mioska as CFO; CEO & COO contracts extended with retention bonuses

Birchtech Corp.

CFO Fiona Fitzmaurice departed May 1, 2026; Michael Mioska appointed CFO effective same day.
CEO Richard MacPherson's employment extended to May 31, 2030; receives $500k cash retention bonus.
James Trettel promoted to COO from EVP of Operations; employment extended to 2030 with $250k bonus.
Mioska is a CPA with 20+ years experience; has consulted for Birchtech since 2023.
CEO & COO base salaries unchanged at $1M and $600k, respectively; no disagreements cited.

item 5.02 item 9.01

Executive movements

Machine-extracted from this filing. Every card cites the SEC source. See all recent executive movements.

Departed

Fiona Fitzmaurice

Chief Financial Officer

BCHT · Birchtech Corp.

Effective: 2026-05-01
Successor: Michael Mioska
Filed: May 6, 2026, 7:59 PM ET

On May 1, 2026, Fiona Fitzmaurice ceased serving as Chief Financial Officer of Birchtech Corp.

Role change

James Trettel

Executive Vice President of Operations

BCHT · Birchtech Corp.

Effective: 2026-05-01
Filed: May 6, 2026, 7:59 PM ET

in connection with his appointment, he ceased serving as Executive Vice President of Operations.

Appointed

James Trettel

Chief Operating Officer

BCHT · Birchtech Corp.

Effective: 2026-05-01
Filed: May 6, 2026, 7:59 PM ET

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.

Appointed

Michael Mioska

Chief Financial Officer

BCHT · Birchtech Corp.

Effective: 2026-05-01
Filed: May 6, 2026, 7:59 PM ET

Effective May 1, 2026, the Company appointed Michael Mioska as its Chief Financial Officer.

Key facts

Extracted from this filing and checked against the source text.

Executive change SEC 8-K Item 5.02 confidence 0.95

Fiona Fitzmaurice departed as Chief Financial Officer at Birchtech Corp..

Action: ceased serving
Role: Chief Financial Officer

Exact text from the filing

On May 1, 2026, Fiona Fitzmaurice ceased serving as Chief Financial Officer of Birchtech Corp.

View on SEC.gov

Executive change SEC 8-K Item 5.02 confidence 0.9

James Trettel changed role as Executive Vice President of Operations at Birchtech Corp..

Action: ceased serving
Role: Executive Vice President of Operations

Exact text from the filing

in connection with his appointment, he ceased serving as Executive Vice President of Operations.

View on SEC.gov

Executive change SEC 8-K Item 5.02 confidence 0.95

James Trettel was appointed as Chief Operating Officer at Birchtech Corp..

Action: appointed
Role: Chief Operating Officer

Exact text from the filing

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.

View on SEC.gov

Executive change SEC 8-K Item 5.02 confidence 0.95

Michael Mioska was appointed as Chief Financial Officer at Birchtech Corp..

Action: appointed
Role: Chief Financial Officer

Exact text from the filing

Effective May 1, 2026, the Company appointed Michael Mioska as its Chief Financial Officer.

View on SEC.gov

Birchtech Corp. filing history →

Source: SEC EDGAR

accession 0001477932-26-002802

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