---
schema_version: "secwatch.filing_event.v1"
accession: "0001079973-25-000781"
form_type: "8-K"
ticker: "CDIO"
cik: "0001870144"
company_name: "Cardio Diagnostics Holdings, Inc."
filed_at: "2025-05-13T23:59:59+00:00"
generated_at: "2026-05-21T18:33:04.532001+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Cardio Diagnostics announces 1-for-30 reverse stock split to regain Nasdaq compliance

## Summary
- Reverse split at 1:30, effective after close May 12; trading begins May 13 under CDIO.
- Outstanding shares reduced from ~52M to ~1.7M; authorized shares remain 300M.
- New CUSIP 14159C202; fractional shares rounded up/down by DTC.
- Split approved by shareholders Nov 15, 2024; Board set ratio on April 10, 2025.
- Split adjusts warrants, options, and equity plan shares proportionately.

## SEC filing metadata
- accession: 0001079973-25-000781
- form_type: 8-K
- ticker: CDIO
- cik: 0001870144
- company_name: Cardio Diagnostics Holdings, Inc.
- filed_at: 2025-05-13T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 3.03, 5.03, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1870144/000107997325000781/0001079973-25-000781-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1870144/000107997325000781/cdio_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001079973-25-000781
- JSON: https://secwatch.observer/filing/0001079973-25-000781.json
- Plain text: https://secwatch.observer/filing/0001079973-25-000781.txt

## Key facts
- Governance Changes
  Cardio Diagnostics Holdings, Inc.: Certificate of Amendment to effect a 1-for-30 reverse stock split, filed with Delaware Secretary of State effective after market close on May 12, 2025 (effective 2025-05-12).
  - Change: charter amendment
  - Effective: 2025-05-12
  source text: On May 12, 2025, the Company filed the Certificate of Amendment with the Delaware Secretary of State to effect the Reverse Stock Split, effective immediately after the close of trading on Nasdaq on May 12, 2025 (the "Effective Time").
  evidence_url: https://www.sec.gov/Archives/edgar/data/1870144/000107997325000781/0001079973-25-000781-index.htm

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