---
schema_version: "secwatch.filing_event.v1"
accession: "0001829126-25-008497"
form_type: "8-K"
ticker: "ADNH"
cik: "0001744494"
company_name: "ADVENT TECHNOLOGIES HOLDINGS, INC."
filed_at: "2025-10-29T23:59:59+00:00"
generated_at: "2026-05-17T01:41:30.714346+00:00"
event_type: "regulatory"
sentiment: "negative"
materiality_score: 0.9
calibrated_materiality_score: 0.9
confidence: "high"
source: SEC EDGAR
---

# Advent Technologies receives Nasdaq delisting notice; trading suspended Oct 30, 2025

## Summary
- Nasdaq to delist common stock and warrants for failure to comply with Listing Rule 5550(b)(1).
- Trading suspension effective October 30, 2025; Nasdaq will file with SEC to complete delisting.
- Common stock (ADN) and warrants (ADNWW) expected to trade on OTC markets after suspension.
- Company received notice on October 28, 2025; cites non-compliance with equity listing standards.

## SEC filing metadata
- accession: 0001829126-25-008497
- form_type: 8-K
- ticker: ADNH
- cik: 0001744494
- company_name: ADVENT TECHNOLOGIES HOLDINGS, INC.
- filed_at: 2025-10-29T23:59:59+00:00
- event_type: regulatory
- sentiment: negative
- materiality_score: 0.9
- calibrated_materiality_score: 0.9
- confidence: high
- sec_items: 3.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1744494/000182912625008497/0001829126-25-008497-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1744494/000182912625008497/adventtech_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001829126-25-008497
- JSON: https://secwatch.observer/filing/0001829126-25-008497.json
- Plain text: https://secwatch.observer/filing/0001829126-25-008497.txt

## Source-grounded claims
- claim_id: dd33e29a115d696a0bccf4e19803c49362ebf93e
  claim: ADVENT TECHNOLOGIES HOLDINGS, INC. received a nasdaq delisting notice notice regarding other (rules 5550(b)(1)).
  evidence_excerpt: October 28, 2025, Advent Technologies Holdings, Inc. (the “Company”) received a notice (the “Notice”) from The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that, due to the Company’s failure to comply with Nasdaq Listing Rule 5550(b)(1), Nasdaq determined to (a) commence proceedings to delist the Company’s common stock, par value $0.0001 per share (“Common Stock”) and the Company’s warrants to purchase one share of common stock, each at an exercise price of $345.00 (the “Public Warrants” and, together with the Common Stock, the “Securities”) and (b) suspend trading in the Securitie
  evidence_url: https://www.sec.gov/Archives/edgar/data/1744494/000182912625008497/0001829126-25-008497-index.htm
- claim_id: e4de3096b4a00bf0b797c5bdebe6ed0da788b96b
  claim: ADVENT TECHNOLOGIES HOLDINGS, INC. received a nasdaq delisting notice notice regarding stockholders equity (rules 5550(b)(1)).
  evidence_excerpt: October 28, 2025, Advent Technologies Holdings, Inc. (the “Company”) received a notice (the “Notice”) from The Nasdaq Stock Market LLC (“Nasdaq”) notifying the Company that, due to the Company’s failure to comply with Nasdaq Listing Rule 5550(b)(1), Nasdaq determined to (a) commence proceedings to delist the Company’s common stock, par value $0.0001 per share (“Common Stock”) and the Company’s warrants to purchase one share of common stock, each at an exercise price of $345.00 (the “Public Warrants” and, together with the Common Stock, the “Securities”) and (b) suspend trading in the Securitie
  evidence_url: https://www.sec.gov/Archives/edgar/data/1744494/000182912625008497/0001829126-25-008497-index.htm

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