KOSPI Drops 40% as EM Index Hits Record AI Concentration
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- South Korea's KOSPI index ripped back 40% in six weeks since late June after AI-fueled gains had doubled its value, while TSMC — the largest company in the MSCI EM universe — fell almost 14% over the same stretch.
- MSCI's $1.8 trillion emerging market benchmark saw volatility surpass COVID pandemic peaks, driven by nine companies — mostly Taiwanese and Korean tech firms plus Alibaba and Tencent in China — that now account for over 40% of the index, making it more top-heavy than the U.S. index.
- Foreign investors pulled over $100 billion from South Korean stocks and $44 billion from Taiwanese stocks in H1 2026, the fastest six-month exit from Asia-ex-China since at least 2010, according to JPMorgan, as concentration-limit rules forced selling of Samsung Electronics (up 500% over 12 months) and SK Hynix (up 1,100%).
- South Korean regulators capped investment in single-stock leveraged ETFs and triggered six or seven circuit breakers in a single month, Amundi portfolio manager Ji Young Park said, while the MSCI EM index's 'liquidity factor' recorded its most dramatic drop on record.
- MSCI research head Ashley Lester said emerging markets 'are not really a source of diversification anymore. They're right in the centre of the AI boom,' and BNP Paribas's William Bratton noted institutional clients now consider any positive Korean earnings story 'not worth pursuing at this point.'
Why it matters: The AI boom has broken emerging markets' traditional role as a portfolio diversifier — with nine AI-linked stocks now comprising over 40% of the $1.8 trillion MSCI EM index, pension funds and global allocators face concentration risk they historically relied on EM to avoid, and institutional clients are declining to buy Korean stocks even on positive earnings, per BNP Paribas's William Bratton.
