The KOSPI climbed steeply from the open, gaining more than 16% intraday to set a new record for a single-day advance and clawing back most of the 16%-plus drop of the previous Tuesday and Wednesday.

Chips drove the index

The rally's axis was semiconductors. Samsung traded up in the low-to-mid 20% range and SK Hynix around 25%; some quotes put Samsung up more than 24% and Hynix more than 28%. Reviving expectations for AI-memory demand were the direct driver.

As the index spiked, volatility in KOSPI 200 futures rose and the exchange invoked a 'buy sidecar,' suspending program buy orders for five minutes—an automatic safeguard against overheating.

A rebound from the two-day rout

The bounce was largely a reaction to the prior sell-off. Over two days markets had dumped tech shares on 'AI bubble' fears and worries about Chinese rivals catching up. But better-than-expected earnings from big U.S. tech firms eased concern about AI spending, and risk appetite returned within a day.

A shift by foreign investors to net buying widened the gains. Foreign money that had recently pressured the won with heavy selling turned to the buy side.

For Chinese investors in Korea

The KOSPI and chip stocks are familiar assets for Chinese residents in Korea. Yet a 16% one-day surge following a 16% two-day drop shows how volatile they are. Hwagyo Sibo recommends no direction; in turbulent stretches, diversification and risk management matter, and the decision and responsibility rest entirely with the individual.

A third perspective

Some see 'a chance to buy low,' others 'a warning of rising volatility.' We lean on neither, setting the facts of index and stocks side by side. The market's direction may turn again with U.S. tech earnings, exchange rates and the global chip cycle.