WKEY

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.

WISeKey Announces Results of Class B Share Election and Name Change of BVI Merger Subsidiary to WISeQey Corp. Zug, Switzerland, September 25, 2026 – WISeKey International Holding Ltd (“WISeKey” or the “Company”) (SIX: WIHN; NASDAQ: WKEY) today announced the results of the share election process conducted in connection with the previously announced proposed cross-border merger of WISeKey with and into its British Virgin Islands subsidiary, formerly known as WISeKey International Corp. (the “Merger”). The Company also announced that WISeKey International Corp. has changed its name to WISeQey Corp. (“WISeQey”), effective September 16, 2026.

WISeKey and OISTE.ORG Expand Post-Quantum Root of Trust to Secure the Quantum and AI Era Quantum-safe Root of Trust designed to provide verifiable identities for AI models, agents, devices and humans, creating a cryptographic foundation for trusted AI Geneva, Switzerland, September 25, 2026 -- WISeKey International Holding Ltd (“WISeKey”) (SIX: WIHN, NASDAQ: WKEY), a leading global cybersecurity, blockchain, and IoT company, in collaboration with the OISTE.ORG Foundation, announced the expansion of its Quantum Root Key initiative into a Post-Quantum Cryptography (“PQC”) Root of Trust architecture for AI systems, autonomous agents, connected devices and human operators. The Quantum Root Key was originally generated to address one of the most significant cybersecurity challenges of the coming decade: the potential ability of sufficiently powerful quantum computers to compromise widely deployed public-key cryptographic systems.

WISeKey, SEALSQ and Canton of Jura Sign MoU to Establish a Swiss Post-Quantum Semiconductor and Cybersecurity Center Proposed CHF 40-60 million public-private initiative aims to establish sovereign semiconductor personalization capabilities in Switzerland and create up to 250+ direct jobs in the Canton of Jura DELÉMONT, Switzerland – September 21, 2026 - WISeKey International Holding Ltd (SIX: WIHN; NASDAQ: WKEY), (“WISeKey” or “the Company”) a global leader in cybersecurity, digital identity and IoT, its subsidiary, SEALSQ Corp (NASDAQ: LAES) ("SEALSQ"), a global leader in secure semiconductors, PKI and post-quantum cybersecurity technologies, and The Republic and Canton of Jura, Switzerland, today announced the signing of a Memorandum of Understanding (“MoU”) to collaborate on the establishment of a Post-Quantum Semiconductor and Cybersecurity Center (the “Jura Center”) in the Canton of Jura. The proposed Jura Center represents an indicative investment of approximately CHF 40-60 million over a period of six years.

WISeKey Shareholders Approve Redomiciliation to the British Virgin Islands at Extraordinary General Meeting Zug, Switzerland, September 10, 2026 –WISeKey International Holding Ltd. (“WISeKey” or the “Company”) (SIX: WIHN, NASDAQ: WKEY) announces that, at the Extraordinary General Meeting (“EGM”) held on September 9, 2026, its shareholders approved the proposal of the Company's board of directors relating to the Company's redomiciliation from Switzerland to the British Virgin Islands.

Geneva, Switzerland, Sept. 09, 2026 (GLOBE NEWSWIRE) -- QSOC aims to establish a secure, sovereign orbital infrastructure combining post-quantum semiconductors, quantum-generated trust and satellite connectivity.

WISeKey and its Subsidiaries, SEALSQ and WISeSat, Present Commercial Quantum Spatial Orbital Cloud (QSOC) at the International Space Summit in Paris

WISeKey Joins the Hedera Council Network of Strategic and Community Partners

WISeKey Appoints Alexander Hirsch as Group Chief Marketing Officer to Coordinate Global Marketing Across the Group Geneva, Switzerland — August 21, 2026 — WISeKey International Holding Ltd. (SIX: WIHN; NASDAQ: WKEY), a global leader in cybersecurity, digital identity and IoT, today announced the appointment of Alexander Hirsch as Group Chief Marketing Officer (CMO), with responsibility for coordinating and accelerating the marketing, communications, brand positioning and go-to-market activities of WISeKey Group and its affiliated companies, including its SEALSQ Corp (Nasdaq: LAES) (“SEALSQ”), SEALQUANTUM, WISeSat and WISeID subsidiaries.

Zug, Switzerland, August 6, 2026 – Ad-Hoc announcement pursuant to Art. 53 of the SIX Listing Rules – WISeKey International Holding Ltd (“WISeKey” or the “Company”) (SIX: WIHN; Nasdaq: WKEY) announced that it will hold an Extraordinary General Meeting of shareholders (the “EGM”) on September 9, 2026, at 3:00 p.m. Swiss time, at the offices of Homburger AG, Prime Tower, Hardstrasse 201, 8005 Zurich, Switzerland.