[6-K] Wisekey International Holding S.A. Current Report (Foreign Issuer)
Rhea-AI Filing Summary
WISeKey International Holding AG reports that its subsidiary SEALSQ Corp has entered into and closed a Series A Investment Agreement to acquire a minority interest in French quantum computing company Quobly SAS. SEALSQ subscribed for Series A preferred shares with attached broad-based anti-dilution ratchet warrants for an aggregate investment of EUR 14,999,400, subject to conditions precedent that have now been satisfied.
The ratchet warrants adjust SEALSQ’s subscription price if Quobly issues additional shares over the next four years at a lower price than the Series A price. As part of the deal, SEALSQ gained the right to appoint one member to Quobly’s supervisory board and named its CEO, Carlos Moreira, to that seat. Any two investor-appointed board members may veto certain major Quobly decisions, such as bylaws changes, mergers, major reorganizations, or new securities issuances.
An accompanying press release notes that SEALSQ participated as a lead investor in Quobly’s €115 million Series A round via the SEALSQ Quantum Fund, positioning the investment as a key step in SEALSQ’s quantum security and infrastructure strategy.
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Insights
SEALSQ makes a sizable strategic quantum computing investment with governance rights.
WISeKey’s subsidiary SEALSQ invested EUR 14,999,400 in Quobly’s €115 million Series A, gaining preferred shares with anti-dilution ratchet warrants. This ties SEALSQ more closely to silicon-based quantum processor industrialization and aligns with its Quantum Vertical Sovereign Stack strategy.
The investment includes a board seat for SEALSQ’s CEO and a veto right shared with other investor representatives over major corporate actions. This governance influence can help protect SEALSQ’s interests but also links outcomes to Quobly’s execution in a complex, emerging quantum hardware market.
SEALSQ’s Quantum Fund has expanded from $20 million to $200 million, with about $30 million deployed before this deal. Future company disclosures may clarify how this and other fund investments contribute to revenue, technology integration, and the broader quantum security roadmap.
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, DC 20549
FORM 6-K
Report of Foreign Private Issuer
Pursuant to Rule 13a-16 or 15d-16 under the
Securities Exchange Act of 1934
For the month of June 2026
Commission File Number: 001-39115
WISEKEY INTERNATIONAL HOLDING AG
(Exact Name of Registrant as Specified in Charter)
WISEKEY INTERNATIONAL HOLDING LTD
(Translation of Registrant’s name into English)
| Canton of Zug, Switzerland | General-Guisan-Strasse 6 CH-6300 Zug, Switzerland |
Not Applicable | ||
| (State or other jurisdiction of incorporation or organization) |
(Address of principal executive office) | (I.R.S. Employer Identification No.) |
Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:
☒ Form 20-F ☐ Form 40-F
On May 26, 2026, SEALSQ Corp (“SEALSQ”) entered into a Series A Investment Agreement (the “Investment Agreement”) to acquire a minority interest in Quobly SAS (“Quobly”), a French société par actions simplifiée engaged in research and development in quantum computing based on spin qubits using semiconductor technologies, along with certain other investors, founders, and existing shareholders of Quobly.
Under the Investment Agreement, SEALSQ subscribed for Series A preferred shares of Quobly with attached broad-based anti-dilution ratchet warrants for an aggregate investment amount of EUR 14,999,400, subject to the satisfaction of several conditions precedent. The ratchet warrants allow SEALSQ to obtain an adjustment of the subscription price of its Series A preferred shares to the average subscription price of the shares issued by Quobly (i) pursuant to the Investment Agreement and (ii) in the four (4) years following the date of issuance of the Series A preferred shares and for a price per share below the Series A price per share.
Closing of the transaction occurred on June 2, 2026.
In connection with the transaction, SEALSQ and two other investors were each granted a right to appoint one member of Quobly’s supervisory board. SEALSQ has appointed its CEO, Carlos Moreira, to fill its seat. Any two investor board members may veto certain significant decisions affecting Quobly, including, but not limited to, amendments to its bylaws or corporate purpose, mergers, demergers, material reorganizations, and any issuance of new securities.
This report contains forward-looking statements within the meaning of the Securities Act of 1933, as amended, and the Securities Exchange Act of 1934, as amended. Statements that are not statements of historical fact, including statements regarding plans, objectives, expectations, intentions, and beliefs, may be identified by words such as “intend,” “accelerate,” “aim,” “designed to,” “plan,” “will,” and similar expressions. Forward-looking statements include, without limitation, statements regarding SEALSQ’s investment in Quobly, the expected terms and timing of the transactions described herein, the anticipated strategic benefits of the investment, and the potential risks and uncertainties associated therewith. These statements involve known and unknown risks, uncertainties, and other factors that may cause actual results to differ materially from any future results, performance, or achievements expressed or implied by such forward-looking statements. WISeKey International Holding AG undertakes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise, except as required by law.
1
| Exhibit No. | Description | |
| 99.1 | Press Release of SEALSQ Corp issued on June 3, 2026 |
2
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
| Date: June 11, 2026 | wisekey international holding ag | ||
| By: | /s/ Carlos Moreira | ||
| Name: | Carlos Moreira | ||
| Title: | Chief Executive Officer | ||
| By: | /s/ John O’Hara | ||
| Name: | John O’Hara | ||
| Title: | Chief Financial Officer | ||
3
Exhibit 99.1
SEALSQ Participates as a Lead Investor in Quobly’s €115 Million Series A Financing Via
SEALQuantum.com Fund to Advance the European Sovereign Quantum Infrastructure
Geneva, Switzerland, June 3, 2026 – SEALSQ Corp (NASDAQ: LAES), (“SEALSQ” or “Company”), a leader in post-quantum semiconductor technologies and hardware-anchored security solutions, today announced its participation as a lead investor in Quobly’s €115 million Series A financing. The round is led by STMicroelectronics, SEALSQ, Isalt, and the French Public Investment Bank (BPI France).
The SEALSQ investment made via the SEALSQ Quantum Fund, supports Quobly’s industrialization of silicon-based quantum processors and the deployment of its first commercial systems. It strengthens the strategic technical partnership initiated in November 2025 and represents a major milestone in the execution of SEALSQ’s Quantum Vertical Sovereign Stack strategy. As part of this investment, Carlos Moreira, CEO of SEALSQ, will join Quobly’s Board of Directors.
Launched in February 2025, the SEALSQ Quantum Fund, a strategic investment initiative dedicated to advancing the quantum technology ecosystem, has grown from $20 million initial allocation, to $200 million as of today. The fund plays a key role in SEALSQ’s Quantum Vertical Sovereign Stack strategy by enabling targeted investments that strengthen the integration of quantum processing and cybersecurity from the ground up. Its mission is to accelerate the emergence of trusted, sovereign, and secure quantum infrastructure for industrial and critical applications.
Building secure quantum systems from qubit to root of trust
SEALSQ’s participation builds directly on the collaboration announced in November 2025 with Quobly to integrate post-quantum cryptography and hardware Root-of-Trust into silicon-based quantum architectures. By combining Quobly’s scalable FD-SOI quantum processors with SEALSQ’s quantum-resistant secure chips, including its QVault TPM and PQC solutions, the two companies are jointly developing secure-by-design quantum computing systems protected from the qubit level against both current and future quantum threats. This investment is expected to be a key step in SEALSQ’s roadmap to deliver a fully integrated Quantum Vertical Sovereign Stack, spanning hardware Root-of-Trust, post-quantum semiconductors, and secure quantum processors.
The collaboration will enable:
| ● | Co-development of quantum-resistant secure microcontrollers optimized for quantum environments, |
| ● | Enhanced device authentication and key management for quantum systems, |
| ● | Creation of trusted, sovereign quantum computing platforms for high-value applications in defense, finance, energy, and critical infrastructure. |
Mr. Moreira noted, “SEALSQ’s participation as a lead investor in Quobly’s Series A financing represents a significant milestone in the execution of our Quantum Vertical Sovereign Stack strategy. This investment made via the SEALSQ Quantum Fund, builds on the SEALSQ - Quobly technical partnership established in 2025 and reflects a shared commitment to advancing the next generation of secure quantum technologies. By integrating Quobly’s pioneering silicon quantum processors with our post-quantum cryptography and hardware security technologies, we are accelerating the development of truly secure quantum computers.”
Mr. Moreira continued, “Excluding this recent Quobly financing, SEALSQ Quantum Fund has deployed approximately $30 million of its $200 million of available funds, across IC’Alps, ColibriTD, EeroQ, WISeSat, Quantix Edge Security, and the WeCan Group, each reinforcing our Quantum vertical strategy from silicon to space. This expanded collaboration with Quobly positions SEALSQ at the forefront of trusted and sovereign quantum computing in the post-quantum era.”
Maud Vinet, CEO and co-founder of Quobly, added, “This investment from SEALSQ builds on the technical collaboration initiated in 2025 and supports our transition toward industrial deployment. As we bring our first silicon-based quantum computers to market, trusted semiconductor technologies and secure computing environments will become increasingly important for real-world adoption.”
About Quobly
Quobly is a pioneer in quantum microelectronics, developing silicon-based quantum chips using proven semiconductor manufacturing processes. Founded in 2022 in Grenoble, France, the company builds on over 15 years of collaborative research between world-class institutions CEA-Leti and CNRS, combining expertise in quantum physics and microelectronics. Co-founded by Maud Vinet, Ph.D. in quantum physics, author of 300+ papers and 70+ patents, and Tristan Meunier, a leading expert in semiconductor quantum engineering trained under Nobel laureate Serge Haroche, Quobly bridges science and industry to make quantum computing scalable and manufacturable. The company has a strategic partnership with STMicroelectronics to accelerate the industrialization of its silicon quantum chips. In 2023, Quobly raised €19 million, a record European seed round for a quantum hardware startup, followed in 2025 by €21 million to advance its Q100T program, a key step toward fault-tolerant quantum computing. Quobly has offices in France, Singapore, and Canada.
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.
Forward-Looking Statements
This communication expressly or implicitly contains certain forward-looking statements concerning SEALSQ Corp and its businesses. Forward-looking statements include statements regarding our business strategy, financial performance, results of operations, market data, events or developments that we expect or anticipate will occur in the future, as well as any other statements which are not historical facts. Although we believe that the expectations reflected in such forward-looking statements are reasonable, no assurance can be given that such expectations will prove to have been correct. These statements involve known and unknown risks and are based upon a number of assumptions and estimates which are inherently subject to significant uncertainties and contingencies, many of which are beyond our control. Actual results may differ materially from those expressed or implied by such forward-looking statements. Important factors that, in our view, could cause actual results to differ materially from those discussed in the forward-looking statements include SEALSQ’s ability to continue beneficial transactions with material parties, including a limited number of significant customers; market demand and semiconductor industry conditions; and the risks discussed in SEALSQ’s filings with the SEC. Risks and uncertainties are further described in reports filed by SEALSQ with the SEC.
SEALSQ Corp 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.
| SEALSQ Corp Carlos Moreira Chairman & CEO Tel: +41 22 594 3000 info@sealsq.com |
SEALSQ
Investor Relations (US) Lena.cati@theequitygroup.com |