Global markets plunged Tuesday as a sweeping tech sell-off that began in the United States rippled across Asian and European trading floors, with Tokyo and Seoul benchmarks sinking more than 3% amid growing concerns about overvalued AI stocks.
The rout, which started earlier this month on Wall Street, intensified as investors continued to flee high-flying tech shares that have dominated market gains throughout 2025. Tokyo’s Nikkei 225 dropped 3.2% to 48,702.98, while South Korea’s Kospi fell 3.3% to 3,953.62, marking some of the steepest single-day declines for both indexes this year.
Tech Giants Lead the Decline
Semiconductor and AI-related companies bore the brunt of the selling pressure. In Japan, Tokyo Electron plummeted 5.5% and Advantest fell 3.7%, while South Korea saw Samsung Electronics drop 2.8% and chip manufacturer SK Hynix shed 5.9% of its value.
The global sell-off follows a brutal week for U.S. markets that saw the Nasdaq Composite plunge 1.9% on November 7, marking its worst weekly performance since March. The broader S&P 500 slid 1.1% to 6,720.32 while the Dow Jones Industrial Average fell 0.8% to 46,912.30.
Monday’s U.S. trading session offered no respite, with the S&P 500 dropping another 0.9%, the Dow industrials falling 1.2%, and the Nasdaq sinking 0.8%. Nvidia, the poster child of the AI boom, lost 1.8% on Monday alone, adding to a 10% weekly decline in early November – though the chipmaker remains up nearly 40% for the year.
Wall Street Warnings
Morgan Stanley CEO Ted Pik had recently cautioned that investors “should be prepared for a 15% draw down,” emphasizing that such a correction “would not necessarily indicate any deep economic problem” but rather questions “the valuation of a lot of these AI stocks.” Goldman Sachs CEO David Solomon echoed these concerns, stating that “valuations in the tech sector have basically reached their limits.”
The early November sell-off wiped more than $500 billion from leading AI chipmakers in a single day, underscoring market analyst warnings that “even great companies can fall if valuations lose their grounding.”
Has the AI bubble finally burst? While tech enthusiasts point to genuine innovations and revenue growth, critics have long warned that U.S. stocks were primed for a correction after their meteoric rise since April, leaving many trading at multiples that appeared disconnected from fundamental business performance.
Japan’s Economic Challenges
In Japan, economic concerns extended beyond the tech sector. The yield on 30-year Japanese government bonds surged to 3.31%, reflecting rising investor anxiety as Prime Minister Sanae Takaichi prepares to boost government spending while delaying plans to reduce Japan’s enormous national debt.
The yen continued its troubling slide, trading above 155 to the U.S. dollar – near its highest level since February – and falling to its lowest point against the euro since 1999. This currency weakness compounds challenges for Japanese consumers already facing rising import costs.
Fed’s Dilemma
Meanwhile, the Federal Reserve finds itself caught between competing priorities. Markets have anticipated interest rate cuts to support a slowing job market, but persistent inflation – still running above the Fed’s 2% target – complicates the central bank’s decision-making.
Adding to the uncertainty, a U.S. government shutdown has delayed the release of critical economic indicators. Employment data, which could influence the Fed’s next move, is now expected to be released Thursday, November 20, 2025.
For investors who’ve enjoyed the seemingly unstoppable rise in tech valuations this year, the current correction serves as a sobering reminder that markets eventually revert to fundamentals. That said, whether this represents a healthy valuation reset or the beginning of a more prolonged downturn remains the trillion-dollar question hanging over trading floors worldwide.
