---
schema_version: "secwatch.filing_event.v1"
accession: "0001477932-25-004727"
form_type: "8-K"
ticker: "BCHT"
cik: "0000728385"
company_name: "Birchtech Corp."
filed_at: "2025-06-20T23:59:59+00:00"
generated_at: "2026-05-19T02:09:20.198126+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# Birchtech Corp. Chairman Christopher Greenberg resigns; CEO MacPherson appointed interim Chairman

## Summary
- Christopher Greenberg resigns as director and Chairman of the Board effective July 1, 2025, to focus on other business pursuits.
- Resignation not due to any disagreement with the Company on operations, policies or procedures.
- Richard MacPherson, President and CEO, appointed interim Chairman effective July 1, 2025; Board will not fill the vacancy at this time.

## SEC filing metadata
- accession: 0001477932-25-004727
- form_type: 8-K
- ticker: BCHT
- cik: 0000728385
- company_name: Birchtech Corp.
- filed_at: 2025-06-20T23:59:59+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/728385/000147793225004727/0001477932-25-004727-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/728385/000147793225004727/meec_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001477932-25-004727
- JSON: https://secwatch.observer/filing/0001477932-25-004727.json
- Plain text: https://secwatch.observer/filing/0001477932-25-004727.txt

## Key facts
- Executive change
  Christopher Greenberg resigned as Director and Chairman of the Board at Birchtech Corp..
  - Action: resigned
  - Role: Director and Chairman of the Board
  source text: Christopher Greenberg submitted his resignation as a director and Chairman of the Board of Birchtech Corp. (the “Company”), effective July 1, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/728385/000147793225004727/0001477932-25-004727-index.htm
- Executive change
  Richard MacPherson was appointed as Chairman of the Board (interim) at Birchtech Corp..
  - Action: appointed
  - Role: Chairman of the Board (interim)
  source text: Richard MacPherson, President, Chief Executive Officer and a director of the Company, has been appointed Chairman of the Board on an interim basis, to be effective July 1, 2025.
  evidence_url: https://www.sec.gov/Archives/edgar/data/728385/000147793225004727/0001477932-25-004727-index.htm

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