WISeKey and its Subsidiaries, SEALSQ and WISeSat, Present Commercial Quantum Spatial Orbital Cloud (QSOC) at the International Space Summit in Paris

QSOC aims to establish a secure, sovereign orbital infrastructure combining post-quantum semiconductors, quantum-generated trust and satellite connectivity.

Geneva, Switzerland, Sept 9, 2026 -- WISeKey International Holding Ltd ((SIX: WIHN, NASDAQ:WKEY), a global leader in cybersecurity, digital identity and IoT today announced that its subsidiaries, SEALSQ Corp (NASDAQ:LAES) ("SEALSQ"), a company that focuses on developing and selling Semiconductors, PKI, and Post-Quantum technology hardware and software products, and WISeSat.Space ("WISeSat") which focuses on space technology for secure satellite communication, presented their commercial Quantum Spatial Orbital Cloud ("QSOC") initiative during the International Space Summit⁠, being held in Paris on September 9 and 10, 2026.

The International Space Summit brings together Heads of State and Government, international organizations, scientists, military representatives, astronauts, policymakers, investors and private-sector leaders to address the opportunities and challenges shaping the future of the space industry.

SEALSQ and WISeSat used the Summit to outline their shared vision for transforming space into a critical infrastructure layer for the emerging quantum internet. The QSOC program is designed to combine WISeSat’s secure satellite constellation and orbital operations with SEALSQ’s post-quantum semiconductors, Public Key Infrastructure ("PKI"), quantum random-number generation and identity-management technologies.

Originally announced in March 2026⁠, the QSOC initiative plans the progressive deployment of a constellation of up to 100 satellites through 2033. The objective is to deliver secure communications, certified quantum randomness and post-quantum identity services from space to governments, defense organizations, financial institutions, critical-infrastructure operators and enterprises.

Building the Security Layer of the Quantum Internet

Quantum computing is expected to create transformative opportunities, but it also poses a fundamental threat to many of the cryptographic systems currently protecting global communications, financial transactions and critical infrastructure.

QSOC is being designed to respond to this challenge by moving part of the post-quantum trust infrastructure into orbit, creating a geographically distributed and resilient security layer that is more difficult to disrupt or compromise.

The planned platform is expected to support:

Post-quantum-secured satellite communications;
Quantum Random Number Generation ("QRNG") delivered from orbit;
Post-quantum identity and device-authentication services;
Secure key provisioning and lifecycle management;
Sovereign communications for governments and critical infrastructure;
Protection against "harvest now, decrypt later" attacks; and
Future integration with terrestrial and space-based quantum computing and optical networks utilizing quantum entanglement (QKD).

SEALSQ intends to operate the QSOC security and cloud-services layer, including its quantum-resistant in-silicon cryptographic semiconductor technology, security architecture, software, service catalogue and customer relationships.

WISeSat envisions to provide and operate the underlying space infrastructure, including the satellites, secure payloads, ground segment, mission control, spectrum and emission management and communications links.

This structure is intended to allow SEALSQ to commercialize subscription-based quantum-security services without assuming the full capital cost of owning the satellite constellation, while allowing WISeSat to focus on developing and operating secure orbital infrastructure.

Carlos Moreira, Chairman and CEO of SEALSQ, commented: "Presenting QSOC at the International Space Summit in Paris demonstrates that post-quantum security and sovereign satellite infrastructure must now be addressed as a single strategic priority. The quantum internet will not be exclusively terrestrial. Space will become an essential layer for distributing trusted identities, cryptographic keys and quantum-generated randomness across borders."

Mr. Moreira continued: "SEALSQ and WISeSat are combining semiconductor security, post-quantum cryptography, PKI and satellite operations into an integrated commercial platform. Our objective is to make QSOC the orbital trust infrastructure protecting governments, financial systems, defense networks and critical industries as the world enters the quantum era."

Supporting Sovereign and Resilient Digital Infrastructure

The presentation in Paris comes as governments worldwide are increasing their focus on sovereign space capabilities, post-quantum migration and the protection of critical communications systems.

By combining secure terrestrial infrastructure with a dedicated orbital layer, SEALSQ and WISeSat believe QSOC can contribute to a more resilient and sovereign global communications architecture. The platform is intended to complement national and regional quantum-communications programs while offering commercial access to organizations requiring scalable, managed post-quantum security services.

The parties expect the QSOC constellation to be deployed progressively, subject to technical validation, regulatory authorizations, launch availability, financing, commercial agreements and final corporate approvals.

About WISeSat.Space

WISeSat.Space ambitions to develop, launch with partners and operate secure small-satellite infrastructure for IoT, encryption key exchange and advanced communications applications.

As the planned owner and operator of the QSOC space segment, WISeSat is expected to provide the satellites, secure payload infrastructure, ground systems and mission operations supporting SEALSQ’s Quantum Spatial Orbital Cloud.

For more information, visit www.wisesat.space⁠.

About SEALSQ:

SEALSQ is a leading innovator in Post-Quantum Technology hardware and software solutions. Our technology seamlessly integrates Semiconductors, PKI (Public Key Infrastructure), and Provisioning Services, with a strategic emphasis on developing state-of-the-art Quantum Resistant Cryptography and Semiconductors designed to address the urgent security challenges posed by quantum computing. As quantum computers advance, traditional cryptographic methods like RSA and Elliptic Curve Cryptography (ECC) are increasingly vulnerable.

SEALSQ is pioneering the development of Post-Quantum Semiconductors that provide robust, future-proof protection for sensitive data across a wide range of applications, including Multi-Factor Authentication tokens, Smart Energy, Medical and Healthcare Systems, Defense, IT Network Infrastructure, Automotive, and Industrial Automation and Control Systems. By embedding Post-Quantum Cryptography into our semiconductor solutions, SEALSQ ensures that organizations stay protected against quantum threats. Our products are engineered to safeguard critical systems, enhancing resilience and security across diverse industries.

For more information on our Post-Quantum Semiconductors and security solutions, please visit www.sealsq.com.

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 houses 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. 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.

Forward-Looking Statements

This communication contains forward-looking statements concerning WISeKey International Holding Ltd and/or its subsidiaries (collectively, "WISeKey," "our" or "us") and its businesses. Forward-looking statements can be identified by terms such as "anticipate," "believe," "estimate," "expect," "intend," "may," "plan," "project," "will," and similar expressions. These statements involve known and unknown risks, uncertainties and other factors that could cause WISeKey’s actual results, financial condition, performance or achievements to differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements. These factors include: our ability to convert our pipeline into actual sales; the ability to realize WISeKey’s anticipated growth strategies and profitability; the development of post-quantum cryptography products and the potential market for such products; WISeKey’s plans for global customer base expansion; the expansion of the WISeSat project and the QSOC initiative; the timing and expected revenues from the commercial deployment of the QS7001 quantum-resistant semiconductor; the sufficiency of cash to meet liquidity needs; WISeKey’s ability to attract and retain customers; changes in economic conditions; market demand and semiconductor industry conditions; and the risks discussed in WISeKey’s filings with the SEC. WISeKey is providing this communication as of this date and does not undertake to update any forward-looking statements as a result of new information, future events or otherwise.

Statements regarding our business pipeline are based on management's current estimates of potential revenue opportunities and do not represent backlog or contracted revenue. Pipeline conversion is subject to numerous factors including customer validation, technical integration requirements, certification timelines, and market conditions. There can be no assurance that pipeline opportunities will convert to actual sales or that such conversion will occur within anticipated timeframes.

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. Given the risks and uncertainties described herein, you should not place undue reliance on forward-looking statements as a prediction of actual results.

Press and Investor Contacts

WISeKey International Holding Ltd

Company Contact: Carlos Moreira

Chairman & CEO

Tel: +41 22 594 3000

info@wisekey.com

WISeKey Investor Relations (US)

The Equity Group Inc.

Lena Cati

Tel: +1 212 836-9611

lena.cati@theequitygroup.com