AI Boom: Global Stock Market Order Shuffles as Taiwan, South Korea Overtake Western Giants

The global stock market pecking order is being redrawn in real time — and artificial intelligence is holding the pen. A global reshuffling in stock-market hierarchy is underway, with AI redrawing the pecking order of equity markets and propelling Taiwan and South Korea past several long-established Western bourses. Taiwan has overtaken Canada to become the world's sixth-largest stock market, while South Korea has leapfrogged the U.K. into eighth place, according to HSBC data tracking global equity-market capitalization rankings.

From Emerging Markets to Global Heavyweights

The scale of the transformation is staggering. Taiwan's stock market was only the world's 12th largest in 2004, worth roughly $500 billion. South Korea ranked 13th at $400 billion. Today, the two markets are valued at $4.7 trillion and $4.4 trillion respectively. That is a near-tenfold increase in market value in just two decades — and the acceleration has been sharpest in the past two years as AI spending exploded globally.

Over the past 12 months alone, Taiwan's market value has surged by nearly $2.7 trillion — a staggering 150% increase — positioning it as a potential contender to overtake India as the world's fifth-largest equity market in the near term. The benchmark TAIEX index also crossed the 40,000 mark for the first time, reflecting strong investor optimism and sustained foreign inflows.

Three Companies at the Centre of It All

The shift is driven primarily by explosive gains in a handful of companies providing the essential hardware that powers the AI revolution: Taiwan Semiconductor Manufacturing Co. (TSMC), the world's largest chip foundry, and South Korea's leading memory makers Samsung Electronics and SK Hynix, which have seen their valuations soar as they serve as the foundational suppliers for AI kingpin Nvidia.

The concentration is remarkable. TSMC now accounts for over 40% of the TAIEX benchmark, while Samsung Electronics and SK Hynix together made up a record 42% of South Korea's KOSPI in May. Taiwan is "well over 80%" exposed to AI-related revenue streams, while South Korea stands at around 60%, as soaring demand for memory chips and advanced semiconductors fuels an unprecedented earnings boom. For a detailed look at how semiconductor supply chains underpin this shift, the Bloomberg analysis of global equity rankings provides authoritative data on the full scope of the market-cap reshuffling.

Why Europe Is Falling Behind

The tech-heavy Asian markets have shot past Germany and France in just the past seven months. The structural reason is straightforward: European stock markets are more heavily weighted toward financial firms — banks, insurers, and industrial conglomerates — sectors that benefit little from the AI capex cycle. Asia's advantage lies in its industrial position at the heart of the semiconductor supply chain, a structural advantage that took decades to build and cannot be replicated quickly. Ian Samson, a portfolio manager at Fidelity International, explained that this trend reflects "the oligopolistic nature of leading-edge semiconductor manufacturing."

Retail Investors Join the AI Rush

The rally is not just being driven by institutional money. The hard-charging Asian stock markets are also enjoying greater support from retail investors lured by the AI stock boom. South Korea is seeing a resurgence of loyal mom-and-pop traders known as "ants" for their tendency to act in unison, while there has also been an upswing in retail participation in Taiwan. Vikas Pershad, an Asia equities portfolio manager at M&G Investments, said the market cap gains in Taiwan and South Korea are "justified" on a long-term view.

The Risk Hidden Inside the Rally

Concentration, however, cuts both ways. With TSMC making up more than 40% of the TAIEX and Samsung plus SK Hynix accounting for over 42% of the KOSPI, both markets are dangerously exposed to a single theme. A slowdown in AI infrastructure spending, an oversupply of memory chips, or a geopolitical disruption to Taiwan's chip production could unwind gains rapidly. South Korea's KOSPI has surged more than 80% this year, while Taiwan's TAIEX has repeatedly posted new records as investors piled into the semiconductor trade — the kind of momentum that can reverse sharply when sentiment shifts.

The New World Order of Global Equities

The broader message for global investors is clear: the AI era is fundamentally repricing which nations matter most in the world's capital markets. The top five global stock markets remain the U.S., China, Japan, Hong Kong, and India — but positions six through ten are being actively contested, and the contest is being won by the countries that make the chips that make AI possible. For investors benchmarked to global indices, underweighting Taiwan and South Korea is now a meaningful active bet — one that has cost Western-focused portfolios dearly over the past two years.