Global Stocks Tumble as AI Investment Faces Policy Uncertainty After Midterm Elections

Global stock markets experienced significant declines following the US midterm elections, driven by fears that a Democratic-controlled Congress will slow investment in artificial intelligence. Japan’s Nikkei index fell almost 6%, its largest drop since April 2025, while South Korea’s KOSPI and Taiwan’s TAIEX declined by 6.7% and 4.5% respectively. The losses followed a $3.2tn wipeout of US stock market value the previous day, with tech stocks and memory chip makers leading the downturn. Analysts attribute the sell-off to concerns over increased regulation of data centers and a potential cooling of AI investment, particularly given public opposition to the sector.

Christopher Forbes of CMCMarkets described the market action as “a bit of a disaster,” noting client margin calls and complaints as investors reacted to the shift in policy expectations. The Nasdaq tech index slumped 5.5%, the DowJonesIndustrialAverage dropped 1,833.06 points (3.44%), and the S&P 500 lost 4.36%. SanDisk fell 22%, while Micron and AMD lost 17% of their value. Nvidia, a chip giant, led declines on the DJIA, down over 9%.

The downturn coincides with an earnings season that has largely disappointed, with results from the “Magnificent Seven” companies falling short of growth expectations and signaling a potential slowdown in AI spending. Kyle Rodda, senior financial market analyst at Capital.com, characterized the sell-off as “brutal.” Investors are also monitoring the latest US jobs report for further clues about the health of the American economy.

Background

• Democrats gained control of Congress in the 2026 midterm elections, enabling them to potentially block legislation and launch investigations [Fact Refinery, 2026-11-04].
• Tech stocks previously experienced a $2.5 trillion value wipeout coinciding with midterm election results and concerns about AI investment returns [Fact Refinery, 2026-11-05].
• The National Security Law was enacted in Hong Kong on June 30, 2020, leading to increased scrutiny of pro-democracy activists [Fact Refinery, 2026-11-05].
• The Bank of England raised interest rates to 4% in response to rising inflation, partially linked to the conflict with Iran [Fact Refinery, 2026-11-05].

Our reading

Our reading is that the current stock market downturn represents a direct response to altered investor expectations following the midterm elections. The significant declines, particularly in tech and chip stocks, suggest a belief that Democratic control of Congress will lead to increased regulation and reduced investment in the AI sector. The combination of disappointing earnings from major tech companies and the election results appears to have created a particularly negative sentiment.

What to watch

• The upcoming US jobs report will provide further insight into the health of the American economy and potentially influence market sentiment [article text].
• Any announcements regarding new regulations targeting data centers or AI investment from the Democratic-controlled Congress [article text].
• The performance of the “Magnificent Seven” companies in subsequent earnings reports, indicating whether the slowdown in AI spending is sustained [article text].

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