India, June 18 -- South Korea Stock Market Today: South Korea's stock market extended its remarkable rally on June 18, 2026, with the benchmark KOSPI index climbing to a new record high as investors embraced improving global risk sentiment, easing geopolitical tensions in the Middle East and renewed confidence in artificial intelligence-driven semiconductor demand. The Korea Exchange (KRX), which operates from 05:30 AM to 11:50 AM (IST), witnessed strong buying across large-cap technology and export-oriented stocks.

The latest surge comes amid growing optimism that the reopening of the Strait of Hormuz could reduce energy supply disruptions and ease inflationary pressures worldwide while semiconductor giants Samsung Electronics and SK Hy...