Page 1

Exhibit 99.1 WIS @ key WISeKey Reports First Half 2026 Financial Results , Accelerates Quantum and Post - Quantum Strategy and Provides Outlook Schedules Conference Call for Thursday , October 1 at 9:00 am ET • H1 2026 Unaudited Revenue Up Approximately 116 % to $ 11.4 Million • Approximately $ 495 Million in Cash and Restricted Cash at June 30 , 2026 SEALSQ Commercial Pipeline Exceeds $ 225 Million Through 2029 FY 2026 Revenue Growth Guidance of 50 % to 100 % Reaffirmed • Shareholders Approved Redomiciliation ; Direct Nasdaq and SIX Listing as WISeQey ( WQEY ) Expected in October Strategic Progress Includes WISeSat and Quantisimo Transactions , Commercial QSOC Deployment , SEALQuantum Expansion and New Swiss Post - Quantum Semiconductor Center - GENEVA , Switzerland – September 30 , 2026 - Ad hoc announcement pursuant to Art . 53 LR - WISeKey International Holding Ltd ( " WISeKey ” or the “ Company ” ) ( SIX : WIHN ; Nasdaq : WKEY ) , a global leader in cybersecurity , digital identity , post - quantum semiconductors , quantum technologies and secure satellite infrastructure , today announced its financial results for the six months ended June 30 , 2026 ( H1 2026 ) and provided an update on significant strategic developments achieved since the beginning of the year . H1 2026 Financial Highlights • Revenue more than doubled : Revenue rose approximately 116 % to approximately $ 11.4 million , from $ 5.3 million in H1 2025 . • Gross profit increased 192 % to $ 5.5 million , compared to gross profit of $ 1.9 million in H1 2025 ; gross margin expanded to approximately 48 % from 35 % in H1 2025 . • Operating loss was $ 40.9 million , compared to operating loss of $ 27.3 million in H1 2025 . • • • Net loss was $ 36.4 million , compared to net loss of $ 22.3 million in H1 2025 . Post - quantum pipeline above $ 100 million : The commercial pipeline as of September 22 , 2026 , at subsidiary SEALSQ Corp ( Nasdaq : LAES ) ( “ SEALSQ ” ) exceeds $ 225 million through 2029 and contains more than $ 100 million associated with the Company's Post - Quantum projects , including the QS7001 and QVault TPM . It reflects rising demand as governments , enterprises and critical infrastructure operators prepare to move to quantum - resistant cryptography . These figures represent management estimates and are subject to risks such as conversion risk , customer validation , technical integration and other commercial risks . Over $ 495 million in cash and restricted cash and minimal debt : At June 30 , 2026 , the Group held approximately $ 495 million in cash and restricted cash and had minimal debt .