WISeKey's Subsidiaries WISeSat and SEALSQ Launch New Satellite with SpaceX, Enabling the First-Ever DePIN from Space and Advancing Quantum-Safe Space Communications

Courtesy of SpaceX WISeKey’s Subsidiaries WISeSat and SEALSQ Launch New Satellite with SpaceX, Enabling the First-Ever DePIN from Space and Advancing Quantum-Safe Space Communications SEALSQ and WISeSat are setting the foundation for a new generation of cyber-resilient, quantum-ready space systems, redefining global digital trust from orbit Geneva, Switzerland, June 23, 2025 –WISeKey International Holding Ltd (“WISeKey”) (SIX: WIHN, NASDAQ: WKEY), a leading global cybersecurity, blockchain, and IoT company, today announces that its subsidiary WISeSat.Space SA (“WISeSat”), has successfully launched its latest generation satellite WISeSat 3 aboard SpaceX’s Falcon 9 Transporter-14 mission, June 23 at 23:18 CEST from Vanderberg, California. This mission represents a breakthrough in space-based cybersecurity and decentralized infrastructure, marking the first satellite to embed Quantum RootKey from SEALSQ’s Corp. (Nasdaq: LAES) (“SEALSQ”), another subsidiary of WISeKey. The new satellite includes cutting-edge technology enabling SEALCOIN token exchanges directly from space, in collaboration with Hedera. Of note, SEALCOIN AG, also a subsidiary of WISeKey, focuses on decentralized physical internet with DePIN technology and house the development of the SEALCOIN platform. This innovation establishes the world’s first Decentralized Physical Infrastructure Network (DePIN) launched from orbit, transforming the role of satellites in decentralized finance and secure digital identity. Simultaneously, the mission is a pivotal step forward in securing space communications through the implementation of post-quantum cryptography (PQC). PQC is critical for protecting satellite communications against future threats posed by quantum computers, which are expected to render current encryption methods like RSA obsolete. Ensuring data integrity and confidentiality is essential in the space environment, and PQC delivers quantum-resistant algorithms that can be integrated into existing systems, allowing for a seamless transition and protection from both current and emerging risks. This satellite architecture supports the integration of PQC within a hybrid framework that enables secure communication between orbital and ground-based infrastructure. By embedding PQC algorithms directly into satellite hardware, the cryptographic processing is isolated from critical systems, thus enhancing security and minimizing vulnerabilities. This approach also allows for secure key generation, distribution, and management, essential functions for trusted data exchange between satellites and Earth stations. The cryptographic algorithms being tested onboard follow the latest standards under development by the U.S. National Institute of Standards and Technology (NIST), ensuring that the technology is aligned with global efforts to future-proof digital infrastructure. With this mission, WISeSat and SEALSQ are demonstrating how PQC can not only be deployed in terrestrial networks, but also extended into orbit, safeguarding critical communications for years to come. Carlos Moreira, Founder and CEO of WISeKey, commented: “This launch is not only a milestone for decentralized infrastructure in space, but also a strategic move toward making space communications quantum-resilient. By embedding PQC and enabling blockchain-based tokenization from orbit, we are reshaping the way cybersecurity, finance, and space technology converge.” Representing WISeSat at the launch was David Fergusson, Board Director of WISeKey, and Executive Managing Director, M&A at Generational Equity. Joining Mr. Fergusson, as a guest of WISeKey was Jon Templeman, CEO of Savior Products and a pioneer in battery technology. Mr. Templeman’s latest innovation is an industry-disruptive ‘shock and vibration management system’ for application to all vehicles–from automobiles to rockets, increasing life-span and reducing material costs. Mr. Fergusson commented, “WISeSat’s groundbreaking innovation, pioneering the advancement of post-quantum cryptography, continues to set precedent for the future of trusted communication and data transmission. And it’s an honor to be joined at this historic launch by Jon Templeman, a pioneer in his own right, whose advancements in battery technology will be transformative for companies like WISeSat.” The latest satellite launch forms part of a growing WISeSat constellation that delivers sovereign, secure, and scalable satellite services for IoT, digital identity, and trusted data transmission. The launch strengthens Europe’s capabilities in space and cybersecurity, promoting technological independence and leadership in the age of quantum computing. About WISeKey WISeKey International Holding Ltd (“WISeKey”, SIX: WIHN; Nasdaq: WKEY) is a global leader in cybersecurity, digital identity, and IoT solutions platform. It operates as a Swiss-based holding company through several operational subsidiaries, each dedicated to specific aspects of its technology portfolio. The subsidiaries include (i) SEALSQ Corp (Nasdaq: LAES), which focuses on semiconductors, PKI, and post-quantum technology products, (ii) WISeKey SA which specializes in RoT and PKI solutions for secure authentication and identification in IoT, Blockchain, and AI, (iii) WISeSat AG which focuses on space technology for secure satellite communication, specifically for IoT applications, (iv) WISe.ART Corp which focuses on trusted blockchain NFTs and operates the WISe.ART marketplace for secure NFT transactions, and (v) SEALCOIN AG which focuses on decentralized physical internet with DePIN technology and house the development of the SEALCOIN platform.Each subsidiary contributes to WISeKey’s mission of securing the internet while focusing on their respective areas of research and expertise. Their technologies seamlessly integrate into the comprehensive WISeKey platform. WISeKey secures digital identity ecosystems for individuals and objects using Blockchain, AI, and IoT technologies. With over 1.6 billion microchips deployed across various IoT sectors, WISeKey plays a vital role in securing the Internet of Everything. The company’s semiconductors generate valuable Big Data that, when analyzed with AI, enable predictive equipment failure prevention. Trusted by the OISTE/WISeKey cryptographic Root of Trust, WISeKey provides secure authentication and identification for IoT, Blockchain, and AI applications. The WISeKey Root of Trust ensures the integrity of online transactions between objects and people. For more information on WISeKey’s strategic direction and its subsidiary companies, please visit www.wisekey.com. DisclaimerThis communication expressly or implicitly contains certain forward-looking statements concerning WISeKey International Holding Ltd and its business. Such statements involve certain known and unknown risks, uncertainties and other factors, which could cause the actual results, financial condition, performance or achievements of WISeKey International Holding Ltd to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements. WISeKey International Holding Ltd is providing this communication as of this date and does not undertake to update any forward-looking statements contained herein as a result of new information, future events or otherwise. This press release does not constitute an offer to sell, or a solicitation of an offer to buy, any securities, and it does not constitute an offering prospectus within the meaning of the Swiss Financial Services Act (“FinSA”), the FinSa's predecessor legislation or advertising within the meaning of the FinSA. Investors must rely on their own evaluation of WISeKey and its securities, including the merits and risks involved. Nothing contained herein is, or shall be relied on as, a promise or representation as to the future performance of WISeKey.Press and Investor Contacts WISeKey International Holding LtdCompany Contact: Carlos MoreiraChairman & CEOTel: +41 22 594 3000info@wisekey.com WISeKey Investor Relations (US) The Equity Group Inc.Lena CatiTel: +1 212 836-9611 lcati@theequitygroup.com

WISeKey's Subsidiaries WISeSat and SEALSQ Launch New Satellite with SpaceX, Enabling the First-Ever DePIN from Space and Advancing Quantum-Safe Space Communications

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