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WISeKey International Holding AG (Nasdaq: WKEY) and Columbus Acquisition Corp. (Nasdaq: COLA) Announce Confidential Submission of Draft Registration Statement on Form F-4 in Connection with Proposed Business Combination

Canton of Zug, Switzerland and Singapore – December 29, 2025 - WISeKey International Holding AG (Nasdaq: WKEY) (“WISeKey”) , a global leader in cybersecurity, digital identity, and IoT solutions platform, and Columbus Acquisition Corp. (Nasdaq: COLA) (“Columbus”), a publicly traded special purpose acquisition company, today announced the confidential submission of a draft registration statement on Form F-4 (the “Confidential Registration Statement”) with the U.S. Securities and Exchange Commission (“SEC”) on December 23, 2025. The Confidential Registration Statement relates to the business combination previously announced on November 10, 2025 (the “business combination”), pursuant to the Business Combination Agreement, as of such date, among Columbus, WISeSat.Space Holdings Corp., a British Virgin Islands business company (“Pubco”), WISeSat.Space Corp., a British Virgin Islands business company (the “WISeSat”) which wholly-owns WISeSat.Space AG, a Swiss company, and the other parties thereto including WISeKey as a Seller (the “Business Combination Agreement”).

WISeKey International Holding AG (Nasdaq: WKEY) and Columbus Acquisition Corp. (Nasdaq: COLA) Execute Business Combination Agreement to Publicly List WISeKey's Subsidiary WISeSat.Space Corp. Under The Name WISeSat.Space Holdings Corp.

WISeKey to receive $250 million in equity of WISeSat.Space Holdings Corp. Transaction anticipated to close in the first half of 2026 Canton of Zug, Switzerland and Singapore, Nov. 10, 2025 (GLOBE NEWSWIRE) -- WISeKey International Holding AG (“WISeKey”) (Nasdaq: WKEY; SIX: WIHN), a global leader in cybersecurity, digital identity, and IoT solutions platform, and Columbus Acquisition Corp. (“Columbus”) (Nasdaq: COLA), a Cayman Islands publicly traded special purpose acquisition company (SPAC), today announced that they have entered into a definitive Business Combination Agreement, dated as of November 9, 2025 (the “Business Combination Agreement”), for a business combination of Columbus and WISeKey's wholly owned subsidiary, WISeSat.Space Corp. (“WISeSat”), a British Virgin Islands holding company that wholly-owns WISeKey's operating subsidiary WISeSat.Space AG, resulting in a public company listed on the Nasdaq Stock Exchange to be named WISeSat.Space Holdings Corp. (“Pubco”).  Upon closing, pursuant to the terms of the Business Combination Agreement, WISeKey will receive 25.0 million shares in Pubco at $10 per share and retain majority ownership.