The global stock market is not evenly distributed. It is not even close. One country holds roughly half of all listed equity value on Earth. That country’s stock market is larger than the next nine biggest markets added together. This is not an accident of history. It reflects decades of policy, capital allocation, legal infrastructure, and — increasingly — the concentration of the world’s most valuable technology companies in a single national market.

The AI Reordering — Why Taiwan and South Korea Passed the UK

The world’s equity rankings are not static. They reflect what investors believe will generate future returns. Between 2023 and 2026, that belief has been overwhelmingly focused on artificial intelligence — specifically on the semiconductor infrastructure that AI requires. Taiwan’s market is now largely a proxy for TSMC, which fabricates 92% of the world’s most advanced chips. South Korea’s market is largely a proxy for Samsung Electronics and SK Hynix, which together dominate global production of the high-bandwidth memory that AI accelerators require. Both countries passed the UK in total equity market cap as AI capital flooded their markets. On April 28, 2026, Bloomberg confirmed South Korea had surpassed the UK to become the world’s eighth-largest equity market. Visual Capitalist noted directly that “Taiwan and South Korea have overtaken older financial powers like the UK as investors pour capital into chip manufacturing and AI infrastructure.” The London Stock Exchange, which ranked sixth globally as recently as May 2025, has now fallen to ninth by country. This is the fastest reshaping of the global equity ranking in decades.

The $152 Trillion World — When Markets Are Worth More Than the Global Economy

Global stock market capitalisation has reached approximately $152 trillion as of mid-2026 — equivalent to 127% of world GDP. The last time the ratio exceeded 100% was from 2019 onwards, peaking near 128% in 2021 before the 2022 sell-off. The recovery since 2022 has been remarkable: global market cap fell approximately $22 trillion in 2022, the steepest single-year decline of the period, before recovering and then surpassing its previous record. The implication of a market cap-to-GDP ratio above 100% is that investors are paying more than one year of global economic output for claims on future corporate earnings. Whether that premium is justified depends entirely on whether AI-driven productivity gains materialise at the scale that current equity prices imply. If they do, today’s valuations will look prescient. If they do not, the correction could be severe.