SEALSQ Corp, a subsidiary of WISeKey International Holding, entered into a Letter of Intent on March 24, 2026 to acquire 100 % of the equity of Miraex SA, a Swiss photonics‑based quantum interconnect developer headquartered at EPFL Innovation Park. The LOI grants a 60‑day exclusivity window for due diligence and negotiation, with a target closing by the end of June 2026, subject to customary closing conditions and regulatory approvals.
Miraex’s thin‑film lithium tantalate (TFLT) photonic integrated circuit technology enables ultra‑efficient electro‑optical transduction and photon entanglement across microwave and THz domains. SEALSQ views this capability as a critical layer for its quantum‑ready semiconductor and satellite‑based quantum infrastructure, and the acquisition is expected to accelerate the company’s Quantum Spatial Orbital Cloud (QSOC) initiative and broaden its end‑to‑end quantum trust architecture.
The transaction will be financed through the SEALSQ Quantum Fund, part of the company’s strategic investment program to build a fully integrated quantum vertical stack. SEALSQ reported FY 2025 revenue of $18 million, a 66 % year‑over‑year increase from $11 million in FY 2024, and a net loss of $30‑$40 million. The company’s cash position stood at more than $425 million as of December 31, 2025, underscoring its capacity to fund growth initiatives despite operating losses.
Carlos Moreira, CEO of SEALSQ, said, "Miraex represents exactly the kind of foundational quantum asset we have been seeking to complete our Quantum Vertical Stack. Their photonics‑based quantum interconnect solutions form a critical interconnect layer linking our quantum computing, quantum networking, and post‑quantum cryptography capabilities." Daniel Brau, CEO of Miraex, added, "We are excited about the signing of this LOI and the opportunity to join SEALSQ through the Quantum Fund."
The quantum interconnect market is projected to reach tens of billions of dollars by 2035, driven by government funding and the need for secure quantum networks. By integrating Miraex’s TFLT platform, SEALSQ positions itself at the forefront of this growth, strengthening its QSOC program and expanding its quantum vertical stack across semiconductor, networking, and satellite domains.
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