{"schema_version":"secwatch.filing_event.v1","accession":"0001829126-24-006964","form_type":"8-K","ticker":"ADNH","cik":"0001744494","company_name":"ADVENT TECHNOLOGIES HOLDINGS, INC.","filed_at":"2024-10-24T23:59:59+00:00","discovered_at":"2026-05-14T18:03:09.435675+00:00","generated_at":"2026-05-30T10:34:27.607855+00:00","sec_items":["5.02"],"event_type":"leadership","sentiment":"negative","materiality_score":0.65,"calibrated_materiality_score":0.65,"confidence":"high","headline":"Advent Technologies terminates CEO Vassilios Gregoriou for cause; appoints director Gary Herman as interim CEO","bullets":["Vassilios Gregoriou terminated as CEO and acting CFO for cause, effective October 24, 2024.","Board appointed existing Class I director Gary Herman as interim CEO, effective immediately.","Company will conduct a search for a permanent CEO."],"urls":{"canonical":"https://secwatch.observer/filing/0001829126-24-006964","json":"https://secwatch.observer/filing/0001829126-24-006964.json","markdown":"https://secwatch.observer/filing/0001829126-24-006964.md","text":"https://secwatch.observer/filing/0001829126-24-006964.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1744494/000182912624006964/0001829126-24-006964-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1744494/000182912624006964/adventtech_8k.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-30T10:34:27.607855+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":"14989e8af3","claim":"Vassilios Gregoriou was terminated as Chief Executive Officer, Acting Chief Financial Officer at ADVENT TECHNOLOGIES HOLDINGS, INC..","evidence_excerpt":"On October 24, 2024, the Board of Directors (the “Board”) of Advent Technologies Holdings, Inc. (the “Company”) approved the termination of the employment of Vassilios Gregoriou, the Chief Executive Officer, Acting Chief Financial Officer, for cause, effective immediately.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1744494/000182912624006964/0001829126-24-006964-index.htm","confidence":1.0,"family_label":"Executive change","details":[{"label":"Action","value":"terminated"},{"label":"Role","value":"Chief Executive Officer, Acting Chief Financial Officer"}],"fact_type":"executive_change"},{"claim_id":"8b6a9c92e9","claim":"Gary Herman was appointed as Interim Chief Executive Officer at ADVENT TECHNOLOGIES HOLDINGS, INC..","evidence_excerpt":"the Company’s board of directors appointed Mr. Gary Herman, who is currently serving as the Company’s Class I Director, to the additional role of interim chief executive officer, effective immediately","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1744494/000182912624006964/0001829126-24-006964-index.htm","confidence":1.0,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"Interim Chief Executive Officer"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}