WISeKey Announces Planned Effectiveness of Redomiciliation from Switzerland to the British Virgin Islands

Zug, Switzerland, September 25, 2026 – WISeKey International Holding Ltd (“WISeKey” or the “Company”) (SIX: WIHN; NASDAQ: WKEY) today announced that it expects the previously announced redomiciliation of WISeKey from Switzerland to the British Virgin Islands to become effective on October 2, 2026 (the “Redomiciliation”). The Redomiciliation is being implemented through the cross-border merger of WISeKey with and into its wholly owned British Virgin Islands subsidiary, WISeQey Corp. (formerly known as WISeKey International Corp., “WISeQey”), with WISeQey continuing as the surviving company (the “Merger”). The Merger and Redomiciliation are expected to become legally effective on October 2, 2026, following completion of the applicable registration procedures.

Upon the effectiveness of the Merger: * WISeKey will be absorbed into WISeQey and WISeKey will cease to exist as a separate legal entity; and * WISeQey will succeed to all of the assets, rights, liabilities and obligations of WISeKey; The Redomiciliation is not expected to change WISeKey’s underlying businesses or operations. The WISeQey’s operational headquarters and place of effective management will remain in Switzerland, and its global operations will continue as before.