South Korean stocks tumble amid China, US semiconductor woes

South Korea's stock market plunged on April 28, marking its second-largest single-day decline in history. The KOSPI index lost 732.09 points, a significant fall attributed to negative semiconductor news emerging from both China and the United States. This downturn erased 600 trillion won from the KOSPI's market capitalization, pushing it below the 5,000 trillion won mark for the first time in two months.

The impact was particularly severe on domestic stocks, with the KOSPI showing a steeper decline compared to markets in Japan and Taiwan. Analysts attribute this heightened vulnerability to the heavy concentration of semiconductor stocks within the KOSPI, which account for nearly half of the market's total value. Samsung Electronics and SK Hynix, major players in the semiconductor industry, significantly influence the index.

The recent sustained decline in the KOSPI has even spawned a new term among individual investors: 'JOMO' (Joy Of Missing Out), reflecting a sentiment of relief for not investing amidst the market's volatility. The "China AI rise" fear, coupled with US-imposed restrictions, has cast a shadow over the semiconductor sector, directly impacting investor confidence and the broader South Korean economy.