Why Southeast Asian Deep Tech Startups Are Flocking to Japan: Capital, Markets, and Geopolitical Shifts

Southeast Asian deep tech startups are increasingly turning to Japan for funding and market access as regional venture capital dries up and home markets remain small. The SusHi Tech conference in Tokyo saw nearly 70 startups from the region, while Japan's government launched procurement pilots in 17 advanced technology areas. With Southeast Asia deal volume dropping 27% in 2025 and later-stage capital scarce, Japanese investors and the Japan Exchange Group offer a lifeline. Accelerated Materials, Pixelence, and Alterno exemplify a trend driven by supply chain security, geopolitical tensions, and Japan's renewed appetite for long-term innovation. This article explores the economic logic, government policies, and underlying shifts reshaping the Asia Pacific startup ecosystem.

The Gravity Shift: Why Japan Is the New Destination for Southeast Asian Deep Tech

Southeast Asia’s startup funding landscape is undergoing a stark transformation. In 2025, deal volume across the region dropped 27% to just 461 deals, even as total deal value rose 18% to $5.38 billion—a sign that capital is concentrating into larger, later-stage rounds while early-stage and deep tech ventures are left scrambling. For startups working on advanced materials, quantum computing, or novel energy storage, the funding crunch is especially acute. These companies require long development cycles and patient capital, yet most Southeast Asian investors—especially those in the region’s venture capital ecosystem—are wired for quick exits.

Japan offers a starkly different proposition. At the SusHi Tech conference in April 2026, Prime Minister Sanae Takaichi announced a government commitment to pilot advanced technologies across 17 areas, including artificial intelligence, semiconductors, quantum computing, biotechnology, and next-generation batteries. The initiative includes procurement pilots that give startups direct channels to public-sector clients, a rarity in most Asian markets. For deep tech founders, this represents not just capital but a commercial proving ground.

The mismatch between Southeast Asian investor expectations and deep tech timelines is bluntly captured by Raheel Zubairi, a partner at a regional deep tech fund. “They prefer something you can launch in six months and see traction,” he says. “For us, you have to wait more than two years. They don’t have the patience for this kind of investment.” Japan’s corporate and governmental investors, by contrast, have historically demonstrated a longer-term orientation, particularly in sectors like manufacturing and materials science.

[IMAGE: Bar chart showing Southeast Asia deal volume (2024 vs 2025) and deal value trend with a callout for deep tech segment.]

The Japan Exchange Group (JPX) has played a pivotal role in this shift. JPX has been actively courting Southeast Asian startups for listing on the Tokyo Stock Exchange’s Growth Market, offering a path to public markets that remains difficult to access in the region. Several deep tech companies from Singapore and Malaysia have already begun preparatory steps for IPOs in Tokyo, attracted by deeper liquidity and a more tech-friendly investor base.

This trend is not just about capital. Japan’s aging industrial base and its need to rejuvenate sectors like semiconductor manufacturing, rare earth processing, and advanced chemicals make it a natural customer for deep tech innovations that can improve efficiency, reduce waste, or substitute critical materials. For founders, the combination of government procurement, corporate partnerships, and equity financing creates a flywheel effect that few other markets can match.

SusHi Tech Conference: A Window into the Trend

The Tokyo Metropolitan Government’s SusHi Tech conference, held from April 27 to 29, 2026, served as a living laboratory for this cross-border flow. Nearly 70 Southeast Asian startups exhibited among 770 total participants, with dedicated delegations from Singapore, Malaysia, Thailand, Vietnam, and Indonesia. The conference floor buzzed with a mix of Japanese corporate venture arms, government agencies, and international investors all scouting for the next breakthrough.

Among the standout Southeast Asian participants was Accelerated Materials, a Singapore-based startup spun out from Cambridge University. The company develops nanoparticle formulations that enable more efficient extraction and processing of rare earth elements—a technology that aligns directly with Japan’s urgent need to secure its rare earth supply chains. “These industries are becoming especially crucial amid geopolitics and supply chain security,” said Kelvin Yeo, co-founder of Accelerated Materials, at the conference. Multiple Japanese trading houses and chemical firms have already initiated pilot projects with the startup.

Another notable exhibitor was Pixelence, a Malaysian company that has developed AI-enhanced brain imaging technology capable of detecting neurological conditions without the use of injected dyes. For Japan’s rapidly aging society, where dementia and stroke monitoring are national health priorities, such non-invasive diagnostics have immediate market potential. Pixelence reported securing preliminary partnership discussions with two of Japan’s largest medical equipment manufacturers during the event.

[IMAGE: Photo of the SusHi Tech exhibition floor with a mix of Japanese and Southeast Asian startup booths, diverse attendees networking.]

Alterno, a Vietnamese startup backed by ADB Ventures, showcased its sand-based thermal battery technology for renewable energy storage. The system uses abundant sand as a heat storage medium, offering a low-cost alternative to lithium-ion batteries for industrial heat applications. Japan’s manufacturing sector, which requires vast amounts of thermal energy for processes like ceramics and steel production, represents a significant market opportunity. The company is now in talks with Japanese engineering firms to deploy demonstration units in Kyushu.

The diversity of technologies on display—from nanomaterials to medical AI to thermal storage—underscores a broader reality: Japan is not just seeking any startup. It is looking for deep tech solutions that address structural vulnerabilities in its economy: raw material dependence, healthcare costs, and energy transition. For Southeast Asian founders, the SusHi Tech conference has become a must-attend event, comparable in importance to Slush in Helsinki or TechCrunch Disrupt in San Francisco.

The Geopolitical Undercurrent: Supply Chain Security and Rare Earths

Behind the economic logic of patient capital and market access lies a powerful geopolitical driver. US-China tensions have forced Japan to reassess its reliance on Chinese supply chains for critical minerals and advanced manufacturing components. Rare earth elements—essential for electric vehicles, defense systems, and consumer electronics—are a particular pain point. China controls roughly 60% of global rare earth mining and over 80% of processing capacity. Japan, as the world’s third-largest importer of rare earths, has been scrambling to diversify sources.

Southeast Asian deep tech startups are stepping into this gap. Accelerated Materials’ nanoparticle technology, for example, can improve the recovery rates of rare earths from lower-grade ores, making it economically viable to process deposits in Vietnam, Indonesia, and Myanmar—countries that sit on significant but underutilized reserves. Japanese trading houses and the state-backed Japan Organization for Metals and Energy Security (JOGMEC) have taken keen interest.

The Japanese government’s pilot program, which targets 17 advanced technology areas including AI, semiconductors, quantum computing, biotechnology, and next-generation energy storage, is explicitly framed around economic security. “We must build a robust ecosystem that can withstand supply chain disruptions and technological decoupling,” said a senior official from the Ministry of Economy, Trade and Industry (METI) during a SusHi Tech panel. The program offers not only procurement contracts but also co-development funding and access to Japan’s extensive network of industrial testbeds.

For Southeast Asian deep tech startups, this geopolitical tailwind creates a unique window. Unlike consumer internet startups that can scale quickly across borders with minimal friction, deep tech companies often require integration into existing industrial value chains. Japan’s willingness to open its supply chains—even to foreign startups—represents a departure from its historically insular corporate culture.

[IMAGE: Map of Asia with arrows connecting Southeast Asia (Singapore, Malaysia, Vietnam) to Japan (Tokyo, Osaka, Kyushu) and icons for rare earth mining, AI, and thermal batteries.]

The rare earth connection is particularly striking. Malaysia is home to the Lynas rare earth processing plant, one of the largest outside China. Vietnam has significant reserves of light rare earths. Indonesia is a major nickel producer, critical for battery supply chains. Japanese investors and corporations are now looking to embed Southeast Asian deep tech startups into their efforts to build alternative, more resilient supply networks. This is not just about buying technology; it is about securing long-term partnerships that reduce dependence on any single country.

The implications for the broader Asia Pacific startup ecosystem are profound. The region has long been dominated by consumer tech and fintech, with deep tech starved for capital and commercial outlets. Japan’s emergence as a counterweight could rebalance the ecosystem, channeling investment toward semiconductor materials, advanced manufacturing, climate tech, and life sciences. For Southeast Asian founders who have struggled to raise Series B and beyond from local VCs, the Japanese route is becoming a credible alternative.

In the long run, this trend may also reshape Japan’s own innovation culture. For decades, the country has been criticized for lacking homegrown unicorns and being overly reliant on corporate R&D. By importing and co-investing in deep tech startups from Southeast Asia, Japan gains access to fresh talent, novel approaches, and entrepreneurial energy that it has struggled to cultivate domestically. Whether this symbiosis will endure beyond the current geopolitical cycle remains uncertain, but for now, the arrows on the map are pointing in one direction: from Southeast Asia to Japan.