The KOSPI surged 17.91% to 6,595.45 — its biggest one-day gain on record — as strong US tech earnings eased AI profitability fears and foreign investors piled back in after a brutal two-week selloff capped by back-to-back circuit breakers.
The KOSPI fell 1.23% to 5,593.56 for a third straight loss as a morning push toward 6,000 collapsed under semiconductor profit-taking. SK hynix sank 5.6% while batteries and banks rallied, and foreign investors returned as net buyers on the main board.
Korea’s KOSPI fell 5.98% and the KOSDAQ 6.12%, with market-wide circuit breakers halting both boards for a second straight day. SK hynix’s guidance letdown and forced selling from single-stock leveraged products drove the slide.
The KOSPI fell 10.84% to 6,023.66 and briefly broke below 6,000 as China semiconductor fears hammered Samsung Electronics and SK hynix. Both exchanges halted trading with sidecars and circuit breakers while foreign investors dumped roughly $3.4 billion of Korean stocks.
Seoul stocks rebounded Monday: KOSPI +0.97% to 6,755, KOSDAQ +2.22%. Falling oil and AI-summit optimism lifted sentiment, with NAVER up 8.4% on an Nvidia investment, even as foreign investors dumped roughly $2.0B of KOSPI shares.
The KOSPI fell 5.72% and the KOSDAQ 5.32% as new US tariffs, oil above $100 and an overnight Wall Street slide hit at once, triggering sell sidecars. Foreigners dumped roughly $2.2B of KOSPI shares while Samsung Biologics jumped 10% on record earnings.
Korea’s KOSPI jumped 4.4% to close back above 7,000 as Alphabet’s earnings and raised AI capex guidance reignited chip sentiment. Foreign investors bought a net ~$1.5B of KOSPI shares, and the KOSDAQ’s 5.2% surge briefly tripped a buy-side sidecar.
The KOSPI opened up 4.51% on a US chip rally, triggered the year’s 20th buy-side sidecar, then gave back most of the gain to close at 6,797.70 (+0.74%) as oil and earnings caution weighed. Foreigners bought a net KRW 2.63T.
Korea’s KOSPI jumped 3.56% to 6,747.95 as Samsung Electronics surged 6.15% and chip stocks led a rebound, tripping the year’s 19th buy-side sidecar. Foreign and institutional buying drove the bounce after a brutal three-week slide.
Korea’s KOSPI fell 4.46% to 6,516.27 and the KOSDAQ lost 5.33% as semiconductor demand worries and US-Iran tensions triggered sell-side sidecars on both exchanges. Institutions led the selling while individuals and foreign investors bought the dip.