Keyword → KOSPI

SK Hynix Falls 15.4% in Record Seoul Plunge — KOSPI Triggers 7th Circuit Breaker of 2026 as AI Memory Unwind Spreads to US Premarket

SK Hynix shares fell 15.4% in Seoul — their worst single-session decline on record — dragging the KOSPI down 8.95% and triggering a 20-minute market-wide circuit breaker, the seventh of 2026. The rout came just one day after SK Hynix's $26.5 billion US ADR debut, as arbitrage selling, a downgraded Q2 profit forecast from Korea Investment & Securities, and renewed US-Iran tensions converged. Micron Technology and the VanEck Semiconductor ETF are both lower in US premarket trading.

OpenAI Weighs IPO Delay to 2027 at $1 Trillion Valuation — SoftBank Plunges 13%, KOSPI Triggers Circuit Breaker as Nasdaq 100 Futures Slide 0.9%

The New York Times reported that OpenAI is considering delaying its initial public offering until 2027, targeting a $1 trillion valuation rather than accepting a lower figure in choppy markets. The news sent SoftBank Group plunging 13%, wiping out 5.6 trillion yen in market value, and triggered an 8% collapse in South Korea's KOSPI that activated a circuit breaker. Nasdaq 100 futures fell 0.9% as investors broadly reassessed AI-sector valuations heading into a pivotal quarter-end Friday.

Nasdaq 100 Futures Slide 3.1%, Kospi Plunges 10% — Global AI Selloff Hits SK Hynix and Samsung as Rate-Hike Fears Mount

Nasdaq 100 futures fell 3.1% in premarket trading Tuesday while South Korea's Kospi plunged nearly 10% — its worst session in years — as a global technology selloff intensified overnight. SK Hynix fell more than 12% and Samsung Electronics dropped sharply, triggering circuit breakers on South Korean exchanges. European markets followed, with ASML down 5% and the Euro Stoxx Technology index falling 3%. The selloff reflects mounting investor concern over Federal Reserve rate-hike signals and the cost of AI infrastructure debt.

South Korea's KOSPI Surges 5% to 5,925 as Samsung and SK Hynix Lead Record Institutional Buying Amid AI Memory Boom

South Korea's benchmark KOSPI index surged more than 5% on Wednesday, closing at 5,925.03 on record institutional net buying of 3.1 trillion won — the single largest institutional buy day in the exchange's history. Semiconductor giants Samsung Electronics and SK Hynix led the rally, reclaiming key psychological price levels at 200,000 won and 1 million won respectively, as investors positioned ahead of Micron Technology's blockbuster earnings expected after the U.S. close.