---
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"
generated_at: "2026-05-30T10:34:27.607855+00:00"
event_type: "leadership"
sentiment: "negative"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Advent Technologies terminates CEO Vassilios Gregoriou for cause; appoints director Gary Herman as interim CEO

## Summary
- 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.

## SEC filing metadata
- 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
- event_type: leadership
- sentiment: negative
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 5.02
- 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

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001829126-24-006964
- JSON: https://secwatch.observer/filing/0001829126-24-006964.json
- Plain text: https://secwatch.observer/filing/0001829126-24-006964.txt

## Key facts
- Executive change
  Vassilios Gregoriou was terminated as Chief Executive Officer, Acting Chief Financial Officer at ADVENT TECHNOLOGIES HOLDINGS, INC..
  - Action: terminated
  - Role: Chief Executive Officer, Acting Chief Financial Officer
  source text: 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_url: https://www.sec.gov/Archives/edgar/data/1744494/000182912624006964/0001829126-24-006964-index.htm
- Executive change
  Gary Herman was appointed as Interim Chief Executive Officer at ADVENT TECHNOLOGIES HOLDINGS, INC..
  - Action: appointed
  - Role: Interim Chief Executive Officer
  source text: 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_url: https://www.sec.gov/Archives/edgar/data/1744494/000182912624006964/0001829126-24-006964-index.htm

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