• WISeKey International Holding AG added SEALSQ as a selling shareholder in the planned WISeSat.Space combination with Columbus Acquisition.
• SEALSQ signed a seller joinder dated Dec. 12, 2025, becoming bound by the Nov. 9, 2025 business combination agreement.
• The joinder covers 435 Company ordinary shares and 435 Company Class F shares to be transferred to WISeSat.Space Holdings at closing.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. WISeKey International Holding AG published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001213900-26-091235), on August 18, 2026, and is solely responsible for the information contained therein.