S&P 500 Drops 4.3% as AI Stocks Lead Market Sell-Off

The S&P 500 fell 4.3% on Thursday, as a broad sell-off of artificial intelligence and semiconductor companies erased gains from the previous day's post-election rally. Investors are currently recalibrating their portfolios following the results of the recent midterm elections in the United States.

Why it is trending now

The market decline, which occurred on November 5, 2026, was triggered by a widespread retreat from technology stocks that had previously been this year's top performers. According to Yahoo Finance, the Nasdaq Composite dropped 5.5%, officially entering correction territory, while the Dow Jones Industrial Average fell 3.4%, or more than 1,800 points. The sell-off was particularly intense for the chip sector, with the PHLX Semiconductor index plummeting 12%.

Key facts

• The Nasdaq-100 index declined by 6.3%, resulting in a loss of $2.3 trillion in market value, according to Yahoo Finance.
• Major technology companies, including Nvidia and Micron, experienced significant losses, as reported by Yahoo Finance.
• Brent crude oil prices were trading around $98 per barrel, while WTI crude stood at $90 per barrel amid geopolitical uncertainty, according to Yahoo Finance.
• Financial Times reported that a total of $3.2 trillion in market value was shed across Wall Street during the session.

Why this is trending in Japan

This development is trending in Japan as part of a wider global market reaction to US economic shifts. As of November 5, 2026, the notes do not specify a unique local trigger for Japanese interest, but the heavy concentration of Japanese institutional investment in US technology indices often leads to heightened local scrutiny during major Wall Street fluctuations.

Background and context

Market volatility has remained a focal point for investors as they process the outcome of the midterm elections. While the initial market reaction on Wednesday was positive, Thursday’s session demonstrated a sharp reversal. Investors are now evaluating the potential impact of a change in political leadership on Capitol Hill, including concerns regarding future economic policies and ongoing global conflicts.

What happens next

Market participants are expected to continue monitoring the performance of large-cap tech stocks and semiconductor indices for signs of stabilization. The ongoing assessment of the Democratic election victory and its implications for US government policy remains a primary driver for investor sentiment. Specific future market movements remain unconfirmed as the broader economic landscape adjusts to the post-election environment.