• Keystone Acquisition units will be eligible for separation into Class A ordinary shares and warrants starting on or about June 22, 2026.
• Unseparated units will keep trading on Nasdaq under KEYYU; separated shares will trade as KEYY, warrants as KEYYW.
• The IPO comprised 28,750,000 units, including 3,750,000 from the underwriters’ overallotment option; the offering closed June 4, 2026.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Keystone Acquisition Corp. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001213900-26-069960), on June 18, 2026, and is solely responsible for the information contained therein.