---
schema_version: "secwatch.filing_event.v1"
accession: "0001213900-26-069960"
form_type: "8-K"
ticker: "KEYY"
cik: "0002102771"
company_name: "Keystone Acquisition Corp."
filed_at: "2026-06-18T16:18:24+00:00"
generated_at: "2026-06-18T16:19:04.883150+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.1
calibrated_materiality_score: 0.1
confidence: "high"
source: SEC EDGAR
---

# Keystone Acquisition Corp. announces separate trading of Class A shares and warrants starting June 22, 2026

## Summary
- Holders of 28,750,000 units (including overallotment) from IPO completed June 4, 2026 may elect separate trading.
- Separate trading of Class A ordinary shares (KEYY) and warrants (KEYYW) begins on or about June 22, 2026.
- Units not separated continue trading under KEYYU on Nasdaq; no fractional warrants will be issued.
- Holders must contact transfer agent Efficiency INC. to separate units into shares and warrants.

## SEC filing metadata
- accession: 0001213900-26-069960
- form_type: 8-K
- ticker: KEYY
- cik: 0002102771
- company_name: Keystone Acquisition Corp.
- filed_at: 2026-06-18T16:18:24+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.1
- calibrated_materiality_score: 0.1
- confidence: high
- sec_items: 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2102771/000121390026069960/0001213900-26-069960-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2102771/000121390026069960/ea0295290-8k_keystone.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-26-069960
- JSON: https://secwatch.observer/filing/0001213900-26-069960.json
- Plain text: https://secwatch.observer/filing/0001213900-26-069960.txt

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