---
schema_version: "secwatch.filing_event.v1"
accession: "0001477932-26-002802"
form_type: "8-K"
ticker: "BCHT"
cik: "0000728385"
company_name: "Birchtech Corp."
filed_at: "2026-05-06T23:59:59+00:00"
generated_at: "2026-05-14T23:01:25.753043+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

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

## Summary
- 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.

## SEC filing metadata
- accession: 0001477932-26-002802
- form_type: 8-K
- ticker: BCHT
- cik: 0000728385
- company_name: Birchtech Corp.
- filed_at: 2026-05-06T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/728385/000147793226002802/0001477932-26-002802-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/728385/000147793226002802/meec_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001477932-26-002802
- JSON: https://secwatch.observer/filing/0001477932-26-002802.json
- Plain text: https://secwatch.observer/filing/0001477932-26-002802.txt

## Key facts
- Executive change
  Fiona Fitzmaurice departed as Chief Financial Officer at Birchtech Corp..
  - Action: ceased serving
  - Role: Chief Financial Officer
  source text: On May 1, 2026, Fiona Fitzmaurice ceased serving as Chief Financial Officer of Birchtech Corp.
  evidence_url: https://www.sec.gov/Archives/edgar/data/728385/000147793226002802/0001477932-26-002802-index.htm
- Executive change
  James Trettel changed role as Executive Vice President of Operations at Birchtech Corp..
  - Action: ceased serving
  - Role: Executive Vice President of Operations
  source text: in connection with his appointment, he ceased serving as Executive Vice President of Operations.
  evidence_url: https://www.sec.gov/Archives/edgar/data/728385/000147793226002802/0001477932-26-002802-index.htm
- Executive change
  James Trettel was appointed as Chief Operating Officer at Birchtech Corp..
  - Action: appointed
  - Role: Chief Operating Officer
  source text: 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.
  evidence_url: https://www.sec.gov/Archives/edgar/data/728385/000147793226002802/0001477932-26-002802-index.htm
- Executive change
  Michael Mioska was appointed as Chief Financial Officer at Birchtech Corp..
  - Action: appointed
  - Role: Chief Financial Officer
  source text: Effective May 1, 2026, the Company appointed Michael Mioska as its Chief Financial Officer.
  evidence_url: https://www.sec.gov/Archives/edgar/data/728385/000147793226002802/0001477932-26-002802-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.