Exhibit 99.1 WISeKey Reports Audited Full Year 2025 Financial Results Schedules Conference Call for Monday, May 4 at 9:00am EDT Geneva, Switzerland - April 30, 2026 - Ad hoc announcement pursuant to Art. 53 LR - WISeKey International Holding Ltd ("WISeKey" or "WISeKey Group") (SIX: WIHN, NASDAQ: WKEY), a leading global cybersecurity, blockchain, and IoT company, today reported its audited financial results for the fourth quarter ("Q4 2025") and full year ("FY 2025") ended December 31, 2025. These results in ...