---
schema_version: "secwatch.filing_event.v1"
accession: "0001829126-26-000309"
form_type: "8-K"
ticker: "ADNH"
cik: "0001744494"
company_name: "ADVENT TECHNOLOGIES HOLDINGS, INC."
filed_at: "2026-01-15T23:59:59+00:00"
generated_at: "2026-05-16T10:10:41.835897+00:00"
event_type: "debt"
sentiment: "neutral"
materiality_score: 0.55
calibrated_materiality_score: 0.55
confidence: "high"
source: SEC EDGAR
---

# Advent Technologies secures CHF 500,000 secured note; appoints lender Chris Antonopoulos to board

## Summary
- Secured promissory note of CHF 500,000 at 8.5% interest, due Jan 7, 2027; secured by all assets and IP.
- Lender may convert principal and interest into common stock at avg of three lowest trade prices in prior 30 days.
- Automatic conversion into common stock upon qualified financing of at least $25M gross proceeds.
- Chris Antonopoulos appointed as Class II director until 2028 annual meeting; note includes most-favored-nation clause.
- Proceeds to be used for working capital and to identify a financial advisor to secure long-term investment partner.

## SEC filing metadata
- accession: 0001829126-26-000309
- form_type: 8-K
- ticker: ADNH
- cik: 0001744494
- company_name: ADVENT TECHNOLOGIES HOLDINGS, INC.
- filed_at: 2026-01-15T23:59:59+00:00
- event_type: debt
- sentiment: neutral
- materiality_score: 0.55
- calibrated_materiality_score: 0.55
- confidence: high
- sec_items: 1.01, 3.02, 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1744494/000182912626000309/0001829126-26-000309-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1744494/000182912626000309/adventtech_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001829126-26-000309
- JSON: https://secwatch.observer/filing/0001829126-26-000309.json
- Plain text: https://secwatch.observer/filing/0001829126-26-000309.txt

## Key facts
- Material Agreements
  ADVENT TECHNOLOGIES HOLDINGS, INC. entered into Secured Promissory Note with Chris Antonopoulos valued at CHF 500,000 (effective 2026-01-08).
  - Action: entry
  - Agreement: credit facility
  - Counterparty: Chris Antonopoulos
  - Value: CHF 500,000
  - Effective: 2026-01-08
  source text: On January 8, 2026, Advent Technologies Holdings, Inc. (the “Company”) entered into a Secured Promissory Note in the aggregate principal amount of CHF 500,000 (the “Promissory Note”) with Chris Antonopoulos (the “Lender”)
  evidence_url: https://www.sec.gov/Archives/edgar/data/1744494/000182912626000309/0001829126-26-000309-index.htm

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