Thailand has the factories. Singapore has the profits. And the gap between the two tells you almost everything about how Japanese capital actually works in Southeast Asia.
By any conventional measure, Thailand is Japan's favorite place in ASEAN. Over 6,000 Japanese legal entities operate there—more than double the count in Indonesia, Vietnam, or Singapore. If you count factories, offices, and representative outposts, the kingdom wins by a landslide. For decades, that number has been the headline in investment promotion brochures and bilateral trade talking points.
But count the money instead, and a very different picture emerges.
In FY2024, Japanese affiliates in Singapore booked roughly ¥1.98 trillion in ordinary profits—more than their counterparts in Thailand, Indonesia, Vietnam, Malaysia, and the Philippines combined. Singapore alone absorbed over half of Japan's total direct investment into ASEAN, a share that has stayed stubbornly high for years. Thailand, despite its manufacturing muscle, generated about ¥1.67 trillion in profits, respectable but clearly second place in the commercial hierarchy.
The lesson for any business leader scanning the region is not that one country "matters more" than another. It is that presence and profitability are two different maps. Japan's corporate footprint in ASEAN is broad and deep, but its commercial value is concentrated in a handful of nodes—and the reasons why are instructive.
The Thailand Story: Scale Without the Margin
Thailand's position as Japan's manufacturing fortress in ASEAN is not accidental. Japanese automakers began assembling there in the 1960s, and the supply chain that grew around them—Tier 1 and Tier 2 suppliers, logistics providers, tooling shops—became the template for Japanese production networks across the region. Today, Thailand is the largest automobile producer in Southeast Asia, and Japanese brands dominate the domestic market.
That industrial depth explains the entity count. It also explains why Thailand's profit pool, while large, is structurally constrained. Automotive manufacturing is a scale business with thin margins, and the Thai operation is increasingly squeezed by Chinese competitors who have moved aggressively into the EV segment. JETRO's 2025 survey found that Japanese firms in Thailand now view Chinese companies as their most formidable rivals, a shift that has accelerated since 2022.
Thailand remains indispensable. But it is a cost-and-capability hub, not a profit center in the way Singapore is. The money made in Thailand is made by making things efficiently and selling them at home and abroad. The money made in Singapore is made by moving capital, managing risk, and coordinating the region.
Singapore: The Profit Engine Nobody Counts in Factories
Walk through Singapore's Jurong or Changi business parks and you will not see the sprawling factories that define Japanese presence in Thailand. What you will see are regional headquarters, treasury centers, trading desks, and insurance operations. That is where the money is.
Singapore's dominance in Japanese commercial value is not new, but it has become more pronounced as Japanese firms consolidate regional functions. A manufacturer with plants in Thailand, Vietnam, and Indonesia increasingly runs its ASEAN procurement, financing, and risk management out of Singapore. The profits from those activities book in Singapore, even when the physical goods never touch the island.
This is why Singapore's ¥2.47 trillion in Japanese direct investment for FY2024 dwarfs every other ASEAN market. It is also why Singapore's profit figure of ¥1.98 trillion is not a fluke of one good year. Finance and insurance, wholesale and retail—these are the sectors driving Japanese earnings in Singapore, and they are structurally higher-margin than automotive assembly.
For a business audience, the implication is blunt: if you are setting up in ASEAN to sell or manufacture, look at Thailand, Vietnam, or Indonesia. If you are setting up to manage, finance, or coordinate, Singapore remains the only serious choice.
The Middle Tier: Indonesia and Vietnam, Different Bets
Indonesia and Vietnam sit in the middle of the commercial value table, but for different reasons.
Indonesia's Japanese profit pool—about ¥643 billion in FY2024—is underpinned by a large domestic market and a deep automotive and motorcycle manufacturing base. Japanese brands have spent decades building distribution and dealer networks there, and the consumer market, while price-sensitive, rewards companies that commit for the long term. The entity count (over 1,100) reflects that commitment, but the profit per entity is lower than in Singapore or Thailand.
Vietnam is the growth story that every Japanese manufacturer talks about but few have fully monetized. Japanese profits there were roughly ¥262 billion in FY2024, less than half of Indonesia's, despite Vietnam's reputation as the preferred China-plus-One destination. The reason is simple: Vietnam's Japanese presence is heavily weighted toward export-oriented manufacturing, where margins are thin and competition from Chinese and Korean firms is intensifying. Vietnam is a production platform first, a market second. That may change as incomes rise, but for now, the profit numbers tell a sobering story for companies expecting quick returns.
Malaysia and the Philippines round out the picture, with Japanese profits of roughly ¥304 billion and a smaller figure for the Philippines, respectively. Malaysia benefits from a mature electronics and semiconductor ecosystem, while the Philippines remains a smaller market with strengths in electronics assembly and business process outsourcing.
What the Numbers Actually Tell a Business Leader
Three conclusions stand out.
First, entity count is a lagging indicator. Thailand's thousands of Japanese companies were built over half a century. They reflect past investment decisions, not necessarily future ones. Vietnam's entity count is growing faster than any other ASEAN market, but the profit pool has not caught up. If you are benchmarking market attractiveness by company count alone, you are looking at history, not opportunity.
Second, the profit concentration in Singapore and Thailand is not a distortion—it is the structure of Japanese capital in the region. Singapore handles the high-value coordination and financial functions. Thailand handles the high-volume manufacturing. Together they account for roughly 70 percent of Japanese commercial value in ASEAN. The rest of the region matters for production and market access, but the margins are thinner.
Third, the competitive landscape is shifting faster than the profit data suggests. Chinese firms are no longer marginal players in ASEAN. In Vietnam, nearly a third of Japanese companies now name Chinese competitors as their primary threat, up sharply from previous years. In Thailand, the same trend is visible in autos and electronics. The profit pools that Japanese firms have enjoyed in Thailand and Indonesia are being contested in ways they were not five years ago.
For a Japanese company considering or expanding its ASEAN footprint, the strategic question is not "where are the most Japanese companies?" It is "where does my business model actually create value?" If the answer is manufacturing scale, Thailand and Vietnam remain the core. If the answer is regional coordination, financing, or high-value services, Singapore is unmatched. And if the answer is domestic market growth, Indonesia's size is hard to ignore—but the margin structure demands patience.
ASEAN is not one market, and Japan's corporate presence there is not one strategy. The companies that succeed in the next decade will be those that stop counting factories and start counting profits—and organize their regional operations accordingly.