{"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","discovered_at":"2026-05-14T18:02:51.118009+00:00","generated_at":"2026-05-19T02:09:20.198126+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"Birchtech Corp. Chairman Christopher Greenberg resigns; CEO MacPherson appointed interim Chairman","bullets":["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."],"urls":{"canonical":"https://secwatch.observer/filing/0001477932-25-004727","json":"https://secwatch.observer/filing/0001477932-25-004727.json","markdown":"https://secwatch.observer/filing/0001477932-25-004727.md","text":"https://secwatch.observer/filing/0001477932-25-004727.txt","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"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-19T02:09:20.198126+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"3f2e5c2cea","claim":"Christopher Greenberg resigned as Director and Chairman of the Board at Birchtech Corp..","evidence_excerpt":"Christopher Greenberg submitted his resignation as a director and Chairman of the Board of Birchtech Corp. (the “Company”), effective July 1, 2025.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/728385/000147793225004727/0001477932-25-004727-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"resigned"},{"label":"Role","value":"Director and Chairman of the Board"}],"fact_type":"executive_change"},{"claim_id":"494e47533f","claim":"Richard MacPherson was appointed as Chairman of the Board (interim) at Birchtech Corp..","evidence_excerpt":"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_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/728385/000147793225004727/0001477932-25-004727-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Chairman of the Board (interim)"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}