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Seoul stocks surge on AI confidence and Iran-Israel ceasefire

|June 9, 2026

5.0

Relevance Score

Seoul stocks surge on AI confidence and Iran-Israel ceasefire — Photo: cdnph.upi.com · rights & takedowns

UPI reports South Korean stocks soared on Tuesday, June 9, as risk appetite returned on an Israel-Iran ceasefire and renewed confidence in the AI sector. Per UPI, the benchmark KOSPI rose 612.52 points, or 8.18 percent, to close at 8,096.93, reversing a more than 8 percent drop the prior session; the Korea Herald reports it was the index's largest single-day point gain on record. UPI reports heavy trading volume of 442.4 million shares worth 46 trillion won (US$30.4 billion), with institutions net buyers of 2.5 trillion won while foreigners and retail investors were net sellers. Large-cap chip names led the rebound; the Korea Herald reports Samsung Electronics rose 4.06 percent and SK hynix 6.59 percent. The prior-session selloff was driven by worries over AI profitability and U.S. rate concerns, with the ceasefire and a Wall Street tech rebound sparking the bounce.

What happened

UPI reports South Korean equities rallied sharply on Tuesday, June 9, as eased geopolitical tensions and a technology-led rebound returned risk appetite to the market. Per UPI, the Korea Composite Stock Price Index (KOSPI) added 612.52 points, or 8.18 percent, to close at 8,096.93, reclaiming the 8,000-point level after a more than 8 percent drop the previous session. The Korea Herald reports it was the index's largest single-day point gain on record, surpassing the prior high of 606.64 points set on May 21. UPI reports trading volume was heavy at 442.4 million shares worth 46 trillion won (US$30.4 billion), with winners outnumbering losers 771 to 133. UPI reports institutions were net buyers of 2.5 trillion won, while foreigners sold 2 trillion won and retail investors sold 618 billion won. UPI reports the Korea Exchange triggered a buy-side sidecar shortly after the open and briefly halted program trading.

What drove the move

UPI reports investors reacted to news that Israel and Iran halted attacks on each other after a warning from the U.S. president, alongside a technology rebound on Wall Street. The bounce followed a Monday selloff that the Korea Herald attributes to worries over AI profitability and the prospect of a U.S. Federal Reserve rate hike after hotter-than-expected May jobs data. UPI quotes Daishin Securities analyst Lee Kyoung-min: "As the negative factors that had triggered the sharp market decline began to ease, investors engaged in bargain hunting, particularly in large-cap semiconductor stocks, which had recently suffered steep losses."

AI and semiconductor context

Chipmakers led the rebound. The Korea Herald reports Samsung Electronics rose 4.06 percent and SK hynix 6.59 percent, while UPI notes gains in U.S.-listed chip names including Micron, SanDisk, Nvidia, and AMD amid the Wall Street recovery. Because semiconductors and AI-exposed stocks carry heavy index weights, swings in AI sentiment can move the whole market sharply over short horizons, as both the Monday drop and the Tuesday rebound illustrate.

What to watch

For market and data teams, the open question is whether the bounce reflects a durable shift in AI sentiment or a sentiment-driven snapback. Subsequent foreign-investor flows, chip-sector earnings and AI-capex guidance, and any further geopolitical developments will signal which it is.

Scoring Rationale

A record one-day KOSPI gain driven centrally by AI-sector sentiment and a semiconductor rebound, with the prior-session selloff tied to AI-profitability worries. The figures are verified across UPI and the Korea Herald, but it is macro and market news rather than an AI/DS/ML technical development, so practitioner relevance is moderate; re-scored down from 6.1.