South Korea Overtakes the United Kingdom as the World’s Eighth-Largest Stock Market

Bloomberg data for mid-2026 show South Korea’s listed-company market capitalisation at US$4.04 trillion, just above the United Kingdom’s US$3.99 trillion. The Korean market, half the size of the UK at the end of 2024, surged over 45 % in 2026, pushing the KOSPI past the 6,600-point mark and displacing the UK to eighth place in global rankings.

Korea Stock Market Overtakes UK to Become World's 8th Largest

Samsung Electronics and SK Hynix together hold more than 40 % of KOSPI value, supplying AI-focused memory chips that fuel the worldwide AI super-cycle. Their 2026 AI-R&D spending reaches US$73.3 billion, while SK Hynix invests US$12.85 billion in advanced packaging. President Lee Jae Myung’s administration simultaneously enacted corporate-governance reforms, including a Commercial Act amendment that forces chaebol to cancel treasury shares and improve minority-shareholder rights.

AI Powers Korea Past UK in Global Stock Market Race

President Lee Jae Myung’s office called the reforms “essential to narrow the Korea discount and boost shareholder value.” The Korean Parliament approved the Commercial Act changes in February 2026. The International Monetary Fund projects UK GDP growth of 0.8 % for 2026, underscoring a slower outlook than Korea’s AI-driven expansion. Goldman Sachs raised its KOSPI target to 8,000 points, citing a 200 % earnings-growth forecast tied to AI demand.

South Korea surpasses UK to become world’s 8th largest stock market

Align Partners activist Lee Chang Hwan warned that “management and the board must proactively work towards improving shareholder value.” Professor Park Sangin of Seoul National University said the Lee family “has no incentive” to deepen governance reforms. Morgan Stanley analysts labelled Samsung “behind the curve” on value creation, noting that reliance on a few chip firms heightens market volatility.

The Straits Times

The overtaking highlights a shift of capital toward AI-hardware supply-chain leaders, making the Korean market more sensitive to AI-spending cycles. Concentration in Samsung and SK Hynix amplifies both upside and downside. Analysts will watch Samsung’s 30 April earnings for AI-chip demand signals, while geopolitical tensions and an IMF-cautioned global slowdown remain key risks.

AI Powers Korea Past UK in Global Stock Market Race

• “The rapid ascent of Korea and Taiwan reflects a structural rebalancing in global equity markets, driven by their dominance in AI hardware rather than tactical asset allocation,” — Francesco Chan, JPMorgan Asset Management

South Korea surpasses UK to become world’s 8th largest stock market

• “Forces such as the potential of AI, global defence spending and corporate governance reforms “support a much steeper trajectory for Korean and Taiwanese equities than for Europe,” said Patrick Kellenberger, an emerging-market equity strategist at Lombard Odier in Geneva.” — Patrick Kellenberger, Lombard Odier

South Korea surpasses UK to become world’s 8th largest stock market

• “The Korean stock market continues to rise even with the war between the US, Israel, and Iran not fully resolved,” — Securities industry official, Korea Exchange

Korea Stock Market Overtakes UK to Become World's 8th Largest

• “What really needs to happen is that management and the board of these companies proactively work towards improving or optimising for shareholder value,” — Lee Chang Hwan, Align Partners Capital Management

The Straits Times

All sources agree on the 2026 market-cap figures, but they provide limited forward-looking data on AI-chip demand beyond 2026, leaving uncertainty about the rally’s durability.

AI Powers Korea Past UK in Global Stock Market Race