Keystone Acquisition Corp. Class A Ordinary Shares

Keystone Acquisition Corp. announced that holders of its units from the initial public offering may elect to separately trade the Class A ordinary shares and warrants starting on or about June 22, 2026. The offering, completed on June 4, 2026, consisted of 28,750,000 units, including 3,750,000 units from the full exercise of the underwriters' overallotment option. Units that remain unseparated will continue trading on The Nasdaq Global Market under the symbol KEYYU, while the Class A ordinary shares and warrants will trade separately under the symbols KEYY and KEYYW, respectively. Only whole warrants will trade, and holders must have their brokers contact transfer agent Efficiency INC. to separate the units.