Bottom Line
KOSPI 8,000 was reached on AI super-cycle fundamentals, but a 30x multiple isn't justified in a single window. Samsung's May 21 strike and the KR mid-May earnings cluster are the next price tests.
KOSPI hits 8,000 and crashes -6.12% the next day — AI super-cycle fundamentals and multiple limits collapsed into a 4-hour window
KOSPI 8,000 was reached on AI super-cycle fundamentals, but a 30x multiple isn't justified in a single window. Samsung's May 21 strike and the KR mid-May earnings cluster are the next price tests.
May 15 record KRW 5.62T foreign single-day selling, KOSPI 200 futures -5% triggering a sell-side circuit breaker, Samsung -8.61% and SK Hynix -7.66% plunging together
Near-term hit — memory big-2, semiconductor specialty (Hanmi Semiconductor, HPSP), high-PER growth names. Holding up — fundamentals with clear consensus (NVDA, hyperscalers). Watching — Samsung May 21 strike negotiation, KR mid-May earnings (HD Hyundai Heavy Industries, HPSP, STX Engine, Hanwha Engine, Iljin Materials, Jeju Semiconductor), persistence of foreign selling, USDKRW 1,500 line
The May 15 -6.12% crash wasn't a single trigger — it was five factors converging. Just after the 8,046.78 intraday record in early trading, the foreign selling avalanche began; a sell-side circuit breaker paused program trading for five minutes, during which rebalancing pressure from all Korean ETFs and index funds discharged at once.
1) Trump's hawkish line on Iran — WTI $105.42 (+4.20%). Persistent fears of Hormuz blockade plus stacked UAE and Kuwait drone interception cases lifted oil from $101 on May 13 to $105.42 on May 15. Crude functioned as the macro trigger behind KOSPI foreign selling.
2) US 10-year yields above 4.5%. The second-week April 3.8% and PPI 6% inflation prints pulled the 10-year back up, and global bond weakness translated into emerging-market equity de-risking.
3) USDKRW touched 1,500. From 1,489.84 on May 14 to a first intraday touch of 1,500 on May 15 (close 1,493.34). 1,500 was the FX-loss threshold for foreign investors and connected directly to the day's KRW 5.62T of selling.
4) Samsung May 21 general strike imminent. May 12 announced the breakdown of a 17-hour negotiation, with the union pressing ahead with a May 21 strike. JP Morgan estimated KRW 43T of loss; Apple, HP, and other global customers are inquiring directly over supply-disruption risk. This was the core trigger for Samsung's single-day -8.61% drop on May 15.
5) KOSPI 12M forward 30x vs S&P 22x — overheated profit-taking. KB Securities' May 14 +40% target raise validated fundamentals, but a 30x multiple is the most expensive among major global indices. After a cumulative +5% rally over four days, a single-day -6.12% pulled in momentum funds and CTAs on the sell side.
The point of May 15 isn't that any single factor pulled the trigger — it's that all five compressed into the same four-hour window.
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