

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.

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.

WISeKey Reports Unaudited Preliminary H1 2026 Key Metrics; Revenue Up 115%, FY 2026 Guidance Reaffirmed FY 2026 guidance of 50%–100% revenue growth underpinned by an active pipeline exceeding $225 million through 2029, new business initiatives and approximately $495 million in cash and short-term investments. Demonstrates continued execution across its quantum, space and digital identity platforms, highlighted by the filing of Form F-4 for the WISeSat–Columbus Acquisition Corp business combination, the launch of operations of Quantix, a post-quantum identity partnership with Wecan, and the integration of the WISeKey Quantum RootKey across SEALQuantum assets.

WISeKey Shareholders Approved All Agenda Items of the 2026 Annual General Meeting Geneva, Switzerland, June 30, 2026 – WISeKey International Holding Ltd ("WISeKey") (SIX: WIHN, NASDAQ: WKEY), a leading global cybersecurity, blockchain, and IoT company, today announces that its shareholders approved all items on the agenda of WISeKey's 2026 Annual General Meeting held on June 29, 2026. Shareholders of WISeKey approved all proposals submitted by the Board of Directors, including: the Annual Report 2025 and the discharge of the Board of Directors and Executive Management; the appropriation of the accumulated loss for fiscal year 2025; the re-election of seven current directors and the election of Andrew Forson as a new director; the re-election of Carlos Moreira as Chairman; the re-election of the members of the Nomination and Compensation Committee, the Company's statutory auditor BDO SA, and Anwaltskanzlei Keller AG as independent proxy; and all compensation-related proposals submitted to shareholders.

WISeKey International Holding Ltd Signs Merger Agreement to Redomicile to the British Virgin Islands Zug, Switzerland, June 29, 2026 – Ad-Hoc announcement pursuant to Art. 53 of SIX Listing Rules – WISeKey International Holding AG (“WISeKey”) (SIX: WIHN; Nasdaq: WKEY) today announced that it has signed a merger agreement with WISeKey International Corp., a British Virgin Islands company and wholly owned subsidiary of WISeKey (“WISeKey BVI”), to effect WISeKey's proposed redomiciliation from Switzerland to the British Virgin Islands.

WISeKey's WISeID Positioned to Benefit from Accelerating Global Transition to Post-Quantum Digital Identity and Authentication Standards

Geneva, Switzerland, June 25, 2026 (GLOBE NEWSWIRE) -- FOR IMMEDIATE RELEASE Proposed Transaction Intended to Create a Consolidated $2 Billion Trusted Quantum Pure-Play Platform Following Additional Acquisitions SEALSQ Corp. (Nasdaq: LAES), a leading developer of semiconductors, PKI, and post-quantum technologies and its parent company, WISeKey International Holding Ltd.