Asia’s stock markets’ “AI dual engines” and the geopolitical oil price shock: Why did Japan and South Korea be the first to hit new records?

Asia’s “AI Dual Engines” and the Geopolitical Oil Shock: Why Japan and South Korea Were First to Break Records

The Japanese and South Korean stock markets reaching historic highs on the same day was not an isolated market event, but rather a sign that Asian markets are being shaped by two forces at once: on one side, the continued spillover of the U.S. tech stock rally and AI capital expenditure cycle; on the other, energy price volatility triggered by tensions in the Middle East, forcing investors to reassess inflation, interest rates, and supply chain costs.

On the surface, this looks like a classic rebound in risk appetite: after the S&P 500 and Nasdaq set new highs, Asian tech stocks naturally followed. But the deeper change is that capital markets are expanding the category of “AI beneficiaries” from the United States to the core links of East Asia’s manufacturing chain. Japan and South Korea were able to break through first precisely because they are not just “Asian stock markets” in the sense of consumer markets, but the most direct profit recipients within the global semiconductor supply chain.

The KOSPI’s sharp surge sent its most eye-catching signal through SK Hynix. The company’s share price jumped significantly, and its market capitalization surpassed $1 trillion for the first time, showing that the market no longer sees memory chips as a traditional cyclical sector, but instead prices them within the core asset framework of AI infrastructure. Data storage, bandwidth, and high-performance memory required for AI training and inference are reshaping the profit structure of the semiconductor industry. For South Korea, this means the valuation anchor of its capital market is shifting from mature electronics chains such as smartphones and display panels toward high-end memory and advanced process-related businesses more closely tied to the expansion of AI computing power.

Samsung Electronics also set a record, and it carries a similar significance. Samsung is not simply benefiting from a single product cycle; its rise is more like the market’s confirmation of a broader recovery in South Korea’s semiconductor ecosystem: when the AI investment boom pushes up chip demand, leading companies with production capacity, process-transition capabilities, and industrial integration strength are often the first to receive valuation re-rating. In other words, the strength of the Korean stock market is not purely sentiment-driven, but reflects how global AI capital spending is beginning to translate into profit expectations through Asia’s supply chain.

Japan’s market performance shows a different structural feature. The Nikkei 225’s record high reflects overseas capital continuing to view Japan as one of Asia’s most important pools of high-quality assets. Unlike South Korea, the rise in Japanese stocks comes not only from semiconductor-related names, but also from improved corporate governance, stronger shareholder returns, and asset revaluation in a yen-based environment. The tech rally has given Japan a new round of upward momentum, but what truly supports the elevation of the index’s center is the market’s long-term judgment on the resilience of Japanese corporate earnings and improving capital efficiency.This is also why Japan’s and South Korea’s markets have responded more strongly than other Asian markets to the rise in U.S. tech stocks, even though they are similarly benefiting. Both sit upstream or at key midstream positions in the global technology supply chain, allowing U.S. AI spending to be converted into revenue and profits for locally listed companies. But this transmission is not even. The mainland Chinese stock market fell on the day, and Hong Kong’s Hang Seng Index also retreated, indicating that a clear divergence is emerging across Asian markets: high-end manufacturing and chip-related chains are being repriced, while markets that rely more on domestic-demand expectations, policy support, or valuation recovery are more easily pressured by external uncertainty.

This divergence is not surprising. Over the past few years, the main theme in Asian capital markets has shifted from “who can restart operations first” to “who can be embedded in the global AI and advanced manufacturing cycle.” Japan, South Korea, and some manufacturing hubs in Southeast Asia have benefited from supply chain restructuring and corporate diversification; for the Chinese market, investors are paying more attention to real estate recovery, consumer confidence, and the speed of policy transmission. In other words, the AI rally in Asia is not spreading evenly, but is reallocating valuation premiums according to differences in supply chain position and capital market structure.

But tech optimism has not eliminated geopolitical risk. Tensions in the Middle East are still affecting oil prices and the pricing of risk assets. Brent crude remains volatile at elevated levels, as markets worry about disruptions to supply through the Strait of Hormuz and about a possible escalation in the conflict between the United States and Iran, which could undermine already fragile expectations for talks. For Asia, such risks are never just geopolitical headlines; they are cost variables that feed directly into trade, inflation, and profit and loss statements.

Why is oil so important to Asia? Because Asia is one of the regions most concentrated in global manufacturing and energy imports. Rising oil prices not only push up transportation and chemical costs, but also squeeze manufacturing margins through higher fuel, electricity, and logistics expenses. For export-oriented economies such as Japan and South Korea, semiconductor and tech stocks may rise on AI expectations, but the broader economy still has to deal with imported inflation, exchange-rate volatility, and uncertainty over the path of monetary policy. For Australia and New Zealand, higher energy costs have a more direct impact on inflation expectations, thereby changing central banks’ policy judgments.

Australia’s core inflation rose again in April, reinforcing market expectations that high interest rates will stay in place for longer; the Reserve Bank of New Zealand, meanwhile, chose to hold steady, but at the same time signaled that future rate hikes could come earlier and be larger than previously expected. All of this points to the same reality: even if global tech stocks hit new highs, monetary policy across Asian countries will not shift toward easing anytime soon. For markets that rely on financing conditions and valuation expansion, this means the AI rally and macro tightening can coexist, and winners and losers within the market will continue to diverge.The weakness of the Chinese market, the pullback in Hong Kong, and the modest rise in Indian stocks also reflect another layer of logic in Asian capital flows: funds are not simply leaving Asia, but are searching for growth with clearer visibility. India is still regarded as a representative of domestic demand and structural growth, but its short-term gains are far less explosive than those of the semiconductor chain. The fact that Singapore was closed for trading instead made regional capital flows easier to observe—when global investors look for assets at the intersection of “AI, chips, and manufacturing upgrades,” East Asian technology chains are clearly more attractive than traditional broad-based markets.

Looking over a longer cycle, what this rally reveals is not the strength of a single sector, but a reordering of industrial capital across Asia. The United States is driving investment in AI infrastructure, and South Korea and Japan have taken up the most critical manufacturing and materials segments; geopolitical conflicts have pushed up energy costs, forcing Asian economies to confront supply-chain resilience and imported inflation once again; meanwhile, the market’s caution toward China, Hong Kong, and other places shows that investors are still waiting for clearer signs of demand recovery.

Over the next few months, the main theme in Asian markets will likely not revolve solely around “how much U.S. stocks have risen,” but will further split into two tracks: one is the high-growth manufacturing chain driven by AI and semiconductors, and the other is traditional assets weighed down by energy prices, interest rates, and a recovery in domestic demand. Japan and South Korea are currently at the forefront of the former track, but they too cannot fully escape the macro constraints brought by the latter.

Therefore, the true significance of this record-breaking rally is not merely that indexes have hit new highs, but that Asian capital markets are redefining what “quality growth” means: no longer just a consumption story or policy stimulus, but whether they can be embedded in the global technology cycle, withstand energy shocks, and maintain stable profits in a complex geopolitical environment. This will determine which markets, industries, and companies Asian capital is more willing to chase in the future.