MiRESSO Completes JPY 4.23 Billion Series A Financing, Bringing Total Funding to JPY 6.68 Billion

　“We are deeply grateful to all of the investors who supported the successful completion of our Series A round.
Together with our new and existing shareholders, we will continue to advance MiRESSO’s vision of establishing a stable supply of beryllium by strengthening our raw material procurement, completing the BETA pilot plant, and further improving product quality.
　Through these efforts, we will accelerate the creation of a new beryllium supply chain in Japan and contribute to the commercialization and deployment of fusion energy.”

　“The realization of fusion energy requires overcoming not only challenges in theory and device development, but also the extremely difficult issue of securing a stable supply of materials.

　MiRESSO’s low-temperature refining technology represents a highly fundamental and promising approach to enabling a stable supply of beryllium, a rare and strategically critical material. MiRESSO’s challenge to translate research results into real-world deployment and to build a new Japan-origin supply chain carries significant meaning.

　We are honored to become a partner of MiRESSO through this round, and we will continue to strongly support the company’s business growth and creation of social value.”

　“Fusion is expected to play a key role as a next-generation energy source for realizing a decarbonized society, and we hope to see its early commercialization. Stable availability of beryllium, a neutron-multiplier material, is essential for commercial fusion reactors, since conventional high-temperature processes face significant cost and environmental challenges.

　MiRESSO’s innovative low-temperature refining technology, originating from QST, has the potential to remove this critical bottleneck and dramatically transform the supply landscape. We are confident that MiRESSO’s strong technological capabilities will drive the establishment of a new supply chain in Japan and contribute to sustainable power generation. As an impact-focused fund, KII is fully committed to supporting MiRESSO’s journey.”

　“Beryllium refined by MiRESSO has a wide range of potential applications, including semiconductors, telecommunications, aerospace, and defense. However, beryllium products are relatively scarce globally as the market is dominated by a small number of overseas suppliers.

　In Japan’s strategic focus area of fusion energy, beryllium is positioned as a critical material. As fusion technology advances, demand for beryllium is expected to intensify further. Against this backdrop, we see significant importance and potential in MiRESSO as a Japanese startup addressing this challenge, and we look forward to strongly supporting the company’s growth.”

　“We are delighted to have the opportunity to invest in MiRESSO. As fusion energy technologies are steadily progressing toward realization, beryllium is playing a crucial role in this field. We have high expectations for MiRESSO’s mission to supply beryllium using its proprietary technology in anticipation of rapidly growing demand.

　Moreover, MiRESSO’s low-temperature refining technology has the potential to be applied to the refining and recycling of other mineral resources, enabling expansion beyond the fusion sector. Kyoto Financial Group will continue to support MiRESSO’s challenge.”

　“The NTT Group, which accounts for approximately 1% of Japan’s commercial electricity consumption, has a strong interest in fusion energy as a future power source, in light of the continued growth in data-center electricity demand driven by the rapid expansion of generative AI.

　One of the most critical challenges for the practical deployment of fusion energy is how to secure fuels and materials in a stable and scalable manner. MiRESSO has built a “first of its kind” system that covers everything from ore procurement to manufacturing and sales to address this fundamental issue. We see significant potential for MiRESSO to make a major leap forward as a Japan-born global startup based on its strong execution capabilities and technological excellence.

　We look forward to working closely with MiRESSO to jointly pursue the realization of fusion energy that can truly change the world.”

　“Since the first close of the Series A round conducted last year, we are delighted to see strong support from many venture capital firms and strategic corporate investors, culminating in the successful completion of this large-scale financing.

　Looking back at developments since last summer, expectations for fusion energy as a national strategic technology have been rising in Japan, while overseas, leading fusion startups such as Commonwealth Fusion Systems have raised over JPY 100 billion, further intensifying global competition.

　MiRESSO is taking these environmental changes seriously, and we, as investors, will continue to support the company so that it can contribute—even in a small way—to the realization of future customers’ needs and a fusion-powered society. We look forward to MiRESSO’s continued growth as a global startup.”

　“Approximately six months have passed since our company invested in MiRESSO. During this period, steady progress has been made in both the development of the BETA pilot plant for beryllium production and in laboratory-based technology validation.

　The completion of this Series A financing will further accelerate MiRESSO’s efforts toward its goal of commencing beryllium production during fiscal year 2027, and signals that the domestic supply of beryllium—an essential material for fusion energy—has entered a full-scale execution phase.

　The strategy of combining MiRESSO’s innovative low-temperature refining technology with our manufacturing infrastructure is highly rational, and through close collaboration, we aim to contribute to the social implementation of fusion energy.”