Zug, Switzerland, July 17, 2026 – Ad-Hoc announcement pursuant to Art. 53 of SIX Listing Rules – WISeKey International Holding Ltd (“WISeKey”) (SIX: WIHN; Nasdaq: WKEY) announced that WISeKey International Corp., a British Virgin Islands company and wholly owned subsidiary of WISeKey (“WISeKey BVI”), has publicly filed on July 16, 2026, a registration statement on Form F-4 with the U.S. Securities and Exchange Commission (the “SEC”) in connection with WISeKey’s proposed redomiciliation from Switzerland to the British Virgin Islands.