[Deep Dive] Nikkei 225 Plunges Over 1% Intraday: Global Tech Sell-off Impact
On June 29, the Nikkei 225 exhibited high volatility, plunging over 1% intraday due to a global tech sell-off. Investors must navigate short-term semiconductor corrections with portfolio diversification.
US Tech Chill Hits the Nikkei 225
On June 29, 2026, the Nikkei 225 index experienced a steep intraday decline of over 1%, shedding more than 1,300 yen. This sharp drop was driven primarily by global macroeconomic conditions and the spillover effects of a tech stock correction in the US market, rather than isolated domestic factors. The cooling of global investor sentiment was triggered by reports of OpenAI considering a delay in its IPO and a broader drop in the Philadelphia Semiconductor Index (SOX) late last week.
Massive Profit-Taking in AI and Semiconductor Stocks
The 1% intraday sell-off was heavily concentrated in large-cap stocks within the AI and semiconductor value chains. Core components that had previously driven the Nikkei 225's strong rally faced heavy selling pressure as valuation burdens materialized.
- Key Stocks Impacted: Major semiconductor and AI-related equities, including SoftBank Group (SBG), Kioxia Holdings, and Advantest, saw concentrated selling from foreign and institutional investors.
Asian Semiconductor Momentum and Index Defense Mechanisms
Despite the severe intraday downward pressure, the market demonstrated resilience through specific sector tailwinds and defensive domestic stocks. News of massive AI and semiconductor mega-project investments announced by the South Korean government, Samsung Electronics, and SK Hynix helped narrow losses across Asian equities. Consequently, short covering and dip-buying by foreign speculative capital pushed the Nikkei 225 to close slightly higher at 69,468.11 (+0.15%).
Furthermore, traditional domestic sectors such as pharmaceuticals, railways, and financials provided strong downward support, bolstered by stabilized oil prices on easing Middle East tensions. As global equity markets enter a phase of separating the winners in the AI mega-cycle, investors should adjust single-sector exposures and diversify portfolios with high-quality domestic stocks to navigate this volatile market.