South Korea's KOSPI Surges Over 5%, Triggering Buy-Side Trading Curbs

South Korean equities surged more than 5% on Tuesday, triggering temporary trading controls as a sharp rebound in technology shares lifted markets across Asia, according to Yonhap.
The Korea Exchange activated a buy-side sidecar mechanism on the KOSPI, suspending program buy orders for five minutes after the rapid advance. The technology-heavy KOSDAQ also triggered a similar measure.
Semiconductor companies led the rally, with SK Hynix gaining nearly 8% and Samsung Electronics advancing more than 5%. In Japan, the Nikkei climbed approximately 2.5% to move back above 60,000, while SoftBank rose nearly 12% ahead of its earnings announcement and Tokyo Electron gained more than 5%.
The rebound followed Monday's rally in US technology stocks and a decline in oil prices. The buying restrictions were designed to moderate abrupt market movements rather than halt all trading, while the scale of the gains highlighted continued volatility in Asian equity markets.