Asia’s AI Chip Giants Are Warping Their Own Stock Markets

CNBC reported Tuesday that AI chip concentration risk is reaching alarming levels across Asia’s two hottest equity markets. Taiwan’s Taiex and South Korea’s Kospi have both surged to successive record highs this year. But the gains are increasingly narrow, resting on a tiny cluster of semiconductor exporters riding the global AI spending wave.

AI Hardware Fuels Record-Breaking Rallies

South Korea’s Kospi has climbed more than 80% in 2026 alone. Taiwan’s Taiex has repeatedly posted fresh all-time highs over the same stretch. Goldman Sachs strategist Tim Moe told CNBC the driver is unambiguous. The AI hardware theme is doing nearly all the heavy lifting, he said. He estimated Taiwan derives more than 80% of its equity exposure from AI-linked revenue. South Korea sits at roughly 60%, powered by surging memory-chip demand.

Two Companies Now Control Nearly Half Their Benchmark Indexes

The numbers behind that rally are striking. Taiwan Semiconductor Manufacturing Company now accounts for over 40% of the entire Taiex benchmark, according to UOB data cited by CNBC. In South Korea, Samsung Electronics and SK Hynix together reached a record 42.2% share of the Kospi in May, per figures from Manulife Investment Management. Samsung’s own market cap crossed $1 trillion last week as investors continued chasing AI-linked positions.

A Rally Built on Exporters, Not Domestic Strength

Mixo Das, JPMorgan’s head of Korea and Taiwan equity strategy, cautioned against reading these moves as signs of broad economic health. Both markets have historically reflected global demand rather than domestic conditions, he noted. That dynamic has not changed. What has changed is the scale of the demand impulse, with Goldman estimating South Korean corporate earnings could grow 300% this year.

Concentration Brings Compounding Vulnerabilities

The same concentration that has powered these indexes also amplifies their downside exposure. Moe flagged several risks. Supply disruptions to the specialized chemicals, photoresists and industrial gases that feed semiconductor fabrication could halt production quickly. Both Taiwan and South Korea also import significant amounts of energy. Sharply higher oil prices, potentially driven by Middle East tensions, would squeeze their purchasing power even as chip exports boom. Jamie Mills O’Brien of Aberdeen Investments described both markets as sitting on the wrong side of commodity trade flows at a particularly precarious moment. Qi Wang, chief investment officer for wealth management, put it plainly to CNBC. Heavy dependence on a single sector increases concentration risk for both the underlying economy and the stock market simultaneously, he said. Index-level euphoria, in other words, may be masking a fragile foundation beneath Asia’s most celebrated rallies.

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