Kospi Index Plunges 4.82% to 7,767.45 as AI Selloff and Iran Tensions Rattle Asia Stocks

The Kospi Index opened on June 8, 2026, in freefall. Early Asian trading saw the Kospi’s losses widen to 8.37%, breaking below the psychological 7,500 level before recovering. The Korea Exchange announced a 20-minute trading halt as circuit breakers triggered following the sharp drop. 

The index recovered partially to close at 7,767.45, a net decline of 4.82%, but the session damage was done. In Korea, the Kospi fell approximately 17% from last week’s record high of 8,900. Two events arrived simultaneously on Friday, June 6: Broadcom’s AI chip guidance miss rattled the global semiconductor trade, and stronger-than-expected US non-farm payrolls raised fresh Federal Reserve rate hike fears. The Kospi, the most AI-concentrated major index in the world, absorbed both hits at once.

What Broke the Market on June 8

The trigger was not domestic; it was a chain reaction that started in the US on Friday, June 6.

The Nasdaq fell 4.2% on Friday, with selling concentrated in semiconductor shares after a solid employment report heightened expectations for a Federal Reserve rate hike. Two-year US Treasury yields rose more than 11 basis points. KOSPI night session futures closed at their 8% daily limit-down heading into Monday’s open, signaling the crash before Asian markets even opened.

The Circuit Breaker Moment

A sidecar was triggered at around 9:34 a.m. after KOSPI200 futures fell 6.26% to 1,216.85. The mechanism temporarily suspended program sell orders for five minutes when futures fell by at least 5% and remained there for one minute. Once that threshold was broken, the index stopped trading like a collection of company stories. It traded like one crowded risk position being cut at speed.

Samsung and SK Hynix: The Epicentre

No stocks matter more to the Kospi than Samsung Electronics and SK Hynix, and both collapsed on June 8.

• Samsung Electronics (KRX: 005930): Fell as much as 11% intraday 
• SK Hynix (KRX: 000660): Slid 10% intraday
• Combined index weight: A record 42.2% of the Kospi, per Manulife Investment Management
• Korean won: Weakened to 1,554.6 per US dollar, down 15.5 won from the prior session. 
• Retail margin debt: 37.74 trillion won as of June 4, leaving leveraged accounts exposed to forced liquidation

The global ripple was immediate. European semiconductor stocks pulled back alongside the Korean selloff: ASML fell 4.6%, ASM International dropped 4.2%, and BE Semiconductor retreated 2.7%. NVIDIA (NASDAQ: NVDA), the US anchor of the AI trade, fell in pre-market trading as the Kospi circuit breaker news spread across desks in New York.

The AI Valuation Warning Underneath the Crash

The June 8 selloff is not just a Korea story; it is a global AI positioning story.

“The narrative that AI runs everything ended last week,” one trader told Reuters on Monday morning. The comment captured the session’s mood precisely. UBS had flagged the risk just days earlier, noting that only 0.02% of global companies have ever maintained cash flow returns on investment above 50% for a decade, raising questions about how long Nvidia’s forecast 82% CFROI can persist.

The Iran conflict added macro weight on top of the AI correction. Negotiations aimed at ending the conflict have stalled, with Iran refusing to abandon its nuclear program or give up its stockpile of enriched uranium. Israeli strikes on Beirut over the weekend pushed oil higher and safe-haven dollar demand up, a combination that directly pressures South Korea, which imports 98% of its fossil fuel needs from overseas.

What Comes Next for the Kospi

Three markers define the recovery path:

• US CPI for May 2026: Released Wednesday, June 10, at 8:30 a.m., the most important near-term data point for whether Fed rate fears intensify or ease
• Won stabilization: A clean recovery setup requires the won to stabilize and foreign selling to slow; the 1,560 zone remains the critical currency stress level
• SpaceX IPO pricing: Expected to finalize on June 11 and list on Nasdaq on June 12 under the ticker SPCX, a major capital allocation event that could compete with Asian equity demand this week

South Korean financial authorities have pledged market intervention. But with 37.74 trillion won in retail margin debt still outstanding and the AI trade globally repricing, intervention alone is unlikely to reverse the structural repositioning underway. Track live Kospi data at krx.co.kr and Bloomberg Markets at bloomberg.com.

Disclaimer

The content shared by Meyka AI PTY LTD is solely for research and informational purposes. Meyka is not a financial advisory service, and the information provided should not be considered investment or trading advice.