WISeKey and Its Subsidiary WISeSat.Space Corp. Announce Filing of Registration Statement on Form F-4 with the U.S. Securities and Exchange Commission Canton of Zug, Switzerland— June 24, 2026 — WISeKey International Holding Ltd. ("WISeKey") (SIX: WIHN; Nasdaq: WKEY), a global leader in cybersecurity, digital identity and IoT, and its subsidiary WISeSat.Space Corp. ("WISeSat") today announced the filing of a registration statement on Form F-4 with the U.S. Securities and Exchange Commission ("SEC") on May 29, 2026 by WISeSat.Space Holdings Corp. ("Pubco"), a wholly-owned subsidiary of WISeSat. The registration statement has not been declared effective by the SEC. The registration statement relates to the previously announced proposed business combination pursuant to a definitive Business Combination Agreement, dated November 9, 2025 (the "Business Combination Agreement"), by and among WISeSat, Columbus Acquisition Corp (Nasdaq: COLA) ("CAC"), a special purpose acquisition company, Pubco, WISeKey, and WISeSat Merger Sub Corp. Subject to the registration statement being declared effective by the SEC, and upon completion of the proposed business combination, each of WISeSat and CAC will become subsidiaries of Pubco, and the combined company is expected to trade on Nasdaq under the ticker symbol "SAIQ." Upon completion of the proposed business combination, Pubco is expected to begin a strategic transformation under the brand SPACEAIQ, reflecting its expanded mission at the intersection of Space Infrastructure, Artificial Intelligence, and Quantum Technologies. The WISeSat brand will continue to serve as the identity of the company's satellite business and space connectivity infrastructure, while SPACEAIQ will represent the broader corporate vision encompassing secure space-based communications, AI-driven autonomous systems, quantum-resilient cybersecurity, and next-generation digital infrastructure. WISeSat is a British Virgin Islands business company developing secure satellite infrastructure and space-based services designed to support trusted communications, digital identity, secure data exchange and other security-sensitive applications. By combining low-earth-orbit satellite assets with advanced cryptographic