South Korea’s equity market, valued at roughly $4 trillion, has become a pivotal early gauge of global risk appetite for artificial‑intelligence‑related spending, according to Bloomberg. The Kospi’s movements are closely watched by fund managers in London, New York and Tokyo before their domestic markets open, because the index reflects sentiment toward high‑bandwidth memory chips produced by Samsung Electronics Co Ltd (KS:005930) and SK Hynix Inc (KS:000660), which are essential components for AI accelerators such as those from NVIDIA Corporation (NASDAQ:NVDA).
The statistical link between the Kospi and the Nasdaq 100 has tightened sharply; the 60‑day correlation rose to 0.46, approaching a two‑year high and roughly three times its five‑year average of 0.16. Likewise, the Nasdaq 100’s sensitivity to below‑trend Kospi returns has climbed to its strongest level since 1990, while a comparable metric for the MSCI World Index reached a four‑year peak.
In the most recent episode, concerns over future AI demand drove the Kospi down almost 9% in a single trading session, a decline that was mirrored on Wall Street. SK Hynix’s U.S.-listed depositary receipts fell 9.3%, pulling other major chipmakers lower.
Leverage has amplified these swings, prompting South Korean regulators to temporarily halt the issuance of new single‑stock leveraged exchange‑traded products to curb speculative activity. Overall, the Kospi has slipped 25% from its June peak, erasing about $1 trillion in market capitalisation. Both Samsung and SK Hynix have each lost at least 30% of their market values during the pull‑back.
Despite the correction, the benchmark remains up 62% for the year to date 2026, keeping it among the world’s strongest‑performing major equity markets.