Asian equity markets dropped sharply on June 23, led by steep losses in technology stocks tied to renewed concerns about the durability of the global artificial intelligence boom. The selloff triggered a trading halt in South Korea and snapped an eight-day rally in Japan.
South Korea hit by circuit breaker and heavy semiconductor losses
South Korea’s KOSPI Index fell 9.99% to 8,203.84, marking one of its worst one-day declines this year. Trading was briefly halted after the benchmark dropped more than 8% intraday, activating a circuit breaker.
Technology heavyweights led the decline. Samsung Electronics and SK Hynix each sank more than 12%, driving a surge in trading volume to 48.37 billion shares. The tech-focused KOSDAQ Index also slid over 6%, with losses spreading across smaller firms.
Foreign traders were the primary sellers, accelerating capital outflows that have persisted throughout June.
Japan rally ends as chip stocks slide
Japan’s Nikkei 225 dropped 3.47% to about 69,788, ending a rally that had pushed the index above 70,000. Major technology names led the pullback, with Tokyo Electron down 6.2%, Kioxia plunging 15.1%, and SoftBank falling more than 10%. The broader TOPIX Index declined 2.6%.
U.S. weakness and Fed outlook add pressure
The downturn followed losses in U.S. technology stocks, where the Nasdaq fell more than 1% and major companies posted broad declines. Given Asia’s role in the global AI supply chain, the weakness quickly spread across regional markets.
Expectations of prolonged higher interest rates in the United States added to the pressure. Strong May labor data, including 172,000 new jobs and a 4.3% unemployment rate, reinforced the likelihood that the Federal Reserve will keep policy tight. Updated forecasts show the 2026 policy rate rising to 3.8%, while core inflation projections increased to 3.3%.
Higher yields have weighed heavily on growth-oriented sectors, particularly semiconductors.
Valuations and concentration amplify volatility
Recent gains had been significant. South Korea’s KOSPI had climbed more than 80% this year, rising from around 5,000 to above 9,000 before the latest drop. Japan’s Nikkei advanced from roughly 40,000 to over 70,000 in the same period.
Market structure has amplified the pullback. Samsung Electronics and SK Hynix together account for about 40% of the KOSPI, increasing sensitivity to swings in semiconductor stocks.
Concerns over supply dynamics also contributed to the decline. Reports that SK Hynix may shift part of its high-bandwidth memory production toward conventional DRAM raised short-term questions about supply and demand balance.
Outlook tied to U.S. data and earnings
Near-term direction is expected to depend on U.S. technology performance and upcoming macroeconomic signals, including inflation data and the next Federal Open Market Committee decision. Earnings from major companies such as Samsung Electronics, SK Hynix, and Tokyo Electron will be closely monitored.
Long-term AI demand remains intact
Despite the recent volatility, the broader outlook for AI-related investment remains strong. Estimates suggest global AI capital expenditure could reach $7.6 trillion between 2026 and 2031, with annual spending projected to double over that period.
South Korea is expected to remain a key player in advanced memory technology. SK Hynix is estimated to control between 50% and 62% of the high-bandwidth memory market, while Samsung Electronics is expanding capacity significantly, with major orders reportedly secured through 2027.
Volatility is likely to persist in the near term as markets adjust to high valuations and shifting monetary conditions, but underlying demand for semiconductors and AI infrastructure continues to support the sector’s long-term growth across Asia.
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