Major stock indexes in the U.S. and Taiwan fell last week as investors sold off AI-related chip and tech stocks [1, 2].
The downturn reflects a growing skepticism among traders regarding the valuations of artificial intelligence technologies. Because these high-growth sectors have driven much of the market's recent gains, a pullback in this area threatens broader economic stability and investor confidence [3, 5].
Market activity during the week of July 20 to 24 saw significant volatility. The Nasdaq-100 index experienced a decline of 4.8% [3]. This trend was mirrored in Taiwan, where tech-heavy indexes faced similar pressure as traders reacted to the shift in sentiment toward semiconductor stocks [2].
Analysts noted that the "Magnificent Seven" — a group of the most influential high-growth tech stocks — have suffered an average decline of 11.5% so far in 2026 [3]. This trend indicates a broader correction in the tech sector that extends beyond a single week of trading.
"Wall Street retreat deepens as AI pullback fuels broad market selloff," the Yahoo Finance editorial team said [1]. The sell-off intensified throughout the week, leading to a mixed session on Friday that ultimately left major indexes lower [2].
"Major indexes close lower for the week after a mixed session on Friday as chip stocks drop," a Yahoo Finance market reporter said [2].
The volatility coincided with other global events, including a magnitude 7.1 earthquake in Kumamoto, Japan, which resulted in 13 deaths [2]. While the earthquake is a separate geopolitical event, it occurred during the same window of market instability reported this month.
“The "Magnificent Seven" stocks have suffered an average decline of 11.5% in 2026 so far.”
This market correction suggests that the initial euphoria surrounding artificial intelligence is being replaced by a demand for tangible returns. The simultaneous drop in both U.S. and Taiwanese markets highlights the global interdependence of the semiconductor supply chain, meaning instability in one region's tech valuation can trigger a systemic pullback across international exchanges.
