Japan and South Korea Stocks Slump on Profit-Taking; 'Memory Rising Star' Kioxia Bucks the Trend.
Japanese and South Korean markets opened lower on June 23, with the Nikkei 225 down 0.33% and the KOSPI plunging 1.6%. This broad retreat follows an overnight decline in U.S. tech stocks, specifically Alphabet and SpaceX, which dampened investor sentiment. Geopolitical tensions, fueled by comments regarding the Strait of Hormuz, weighed on energy and trade sectors. Additionally, MSCI’s annual market classification review introduced significant volatility. Despite recent record highs, markets are currently reacting to global macroeconomic shifts and regional uncertainty rather than fundamental domestic deterioration. Samsung and SK Hynix led the KOSPI’s decline, contrasting with Kioxia’s gains.

TradingKey - During the Asian trading session on June 23, Japanese and South Korean stock markets opened lower. The Nikkei 225 opened 0.33% lower, shedding over 200 points to trade at 72,112.43; the KOSPI plunged 1.6% at the open, falling below the 90,000-point mark to 8,968.43. Yesterday, the Nikkei 225 surged 1.55% to hit a record high, while the KOSPI index fluctuated at high levels.
KOSPI Index Chart, Source: TradingView
In terms of individual stocks, Samsung Electronics opened down over 1%, temporarily trading at 349,500 KRW; SK Hynix fell 0.31% to 2.91 million KRW, down 1.3%; Kioxia opened up 1.79% to 110,600 JPY.
Kioxia Price Chart, Source: TradingView
Today's opening decline in Japanese and South Korean stock markets was not triggered by deteriorating fundamentals in a single country, but was rather the result of a combination of multiple negative factors, including the overnight plunge in US tech stocks, sudden shifts in the global political and geopolitical landscape, and key domestic events in South Korea.
In terms of news, Alphabet led the decline, dragging down the Nasdaq by 1.32%, while the newly listed SpaceX (SPCX) plunged over 16%, dampening market sentiment. U.S. President Trump's comments that he 'might take over the Strait of Hormuz' triggered a sharp drop in crude oil prices, hitting Japanese energy and foreign trade stocks. Furthermore, MSCI's announcement of its annual market classification review results today sparked severe market volatility.
This content was translated using AI and reviewed for clarity. It is for informational purposes only.
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