Tech stocks plunge as US midterms spark AI slowdown fears
ITF Team3 min read
Major tech indexes fell over 5% on 5 November 2026 after Democrats won Congress, wiping $2.5tn from market value as AI data‑centre scrutiny rises.
Key takeaways
- The Nasdaq Composite closed down 5.5% on 5 Nov 2026, erasing about $2.5 trillion in market value.
- Japanese Nikkei 225 fell 6% in early trade, led by Kioxia (-12.6%) and Tokyo Electron (-9.5%).
- South Korean Kospi dropped more than 8.5%, triggering a circuit‑breaker on 5 Nov 2026.
- Nvidia lost over 9% on the day, shaving more than $400 billion off its market cap.
On 5 November 2026, major technology and artificial‑intelligence‑related stocks suffered a sharp sell‑off after the U.S. midterm elections gave Democrats control of both the Senate and the House. The rout erased an estimated $2.5 trillion in market value, with the Nasdaq Composite slipping more than 5.5% and Asian tech indexes tumbling as investors priced in the prospect of tighter regulation on AI data‑centre construction.
U.S. equity markets react to Democratic wins
The Nasdaq Composite, heavily weighted toward AI‑focused firms, closed down 5.5%, marking its worst single‑day loss since 2025. The broader S&P 500 fell 4.4% and the Dow Jones Industrial Average reversed its prior gains to end the session 3.4% lower. Nvidia, the flagship AI chipmaker, dropped over 9%, wiping more than $400 billion from its valuation. Other semiconductor names such as AMD, Micron and Intel fell 17%, 17% and 10.3% respectively, while memory‑card maker SanDisk plunged 22%.
Analysts attribute the plunge to heightened concerns that the massive public and private spending on AI infrastructure may not translate into expected returns, especially if new data‑centre projects face legislative roadblocks. Democratic candidates campaigned on limiting the expansion of data centres, and Governor‑elect Gina Hinojosa of Texas pledged a moratorium on new construction. With Congress now under Democratic control for the remainder of President Trump’s term, the regulatory outlook for AI‑related capital spending has become more uncertain.
Asian markets feel the ripple effect
In Tokyo, the Nikkei 225 opened 6% lower, driven by a 12.6% slide in memory‑chip maker Kioxia and a 9.5% drop in Tokyo Electron, both key suppliers for AI hardware. South Korea’s Kospi plunged more than 8.5%, activating a circuit‑breaker that temporarily halted trading. Chipmakers SK Hynix and Samsung fell 11.5% and nearly 10% respectively, reflecting investor fears that a slowdown in U.S. data‑centre construction will depress demand for high‑performance semiconductors.
The coordinated sell‑off underscores the global nature of the AI supply chain. Investors in Asian exchanges are reacting to the same policy risk that hit Wall Street, as many of the firms listed there produce the chips, wafers and equipment that power U.S. AI data centres. The Philadelphia Semiconductor Index, a barometer for the sector, dropped more than 12% on the day.
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What the numbers mean for traders
The magnitude of the decline pushes the Nasdaq into correction territory, defined as a 10% pull‑back from recent highs. While the index remains above its 2024 peak, the speed of the loss suggests that market participants are reassessing growth forecasts for AI‑related earnings. Technical analysts note that the 5‑day moving average on the Nasdaq is now acting as resistance, and a break below the 13,500 level could invite further downside.
In Asia, the Nikkei’s 30‑day moving average sits near 33,200, a level that previously acted as support in early‑2025 rallies. Breaching that threshold may trigger algorithmic selling. Similarly, the Kospi’s 20‑day average around 2,300 points could become a focal point for short‑term traders watching for a rebound once the policy debate settles.
Looking ahead: data and policy cues
Traders will monitor the first quarter of 2027 for any legislative proposals that could formalise data‑centre moratoria or impose new environmental standards on AI infrastructure. In the U.S., the House Judiciary Committee is slated to hold hearings on AI oversight on 15 January 2027, while the Senate Energy Committee plans a briefing on AI‑related supply‑chain risks on 22 January.
On the macro side, the Federal Reserve’s upcoming policy meeting on 31 January 2027 will also be watched, as tighter monetary conditions could further strain high‑growth tech valuations. In Asia, the Bank of Japan’s next rate decision on 28 February 2027 may influence yen‑denominated chip exports, adding another layer of uncertainty for the sector.
- 5 Nov 2026 – Nasdaq down 5.5%, $2.5 tn market‑value loss
- 6 Nov 2026 – Nikkei 225 off 6% in early trade
- 5 Nov 2026 – Kospi triggers circuit‑breaker after >8.5% fall
- 15 Jan 2027 – U.S. House AI‑oversight hearing scheduled
Frequently asked questions
Why did tech stocks fall after the US midterms?
The Democratic victories gave the party control of Congress, raising expectations that new legislation could restrict the construction of AI data centres. Investors feared that tighter rules would curb spending on AI infrastructure, leading to a rapid sell‑off in companies heavily exposed to AI chips, memory, and related hardware.
Which Asian indexes were most affected and why?
Japan’s Nikkei 225 fell about 6% as memory‑chip maker Kioxia dropped 12.6% and Tokyo Electron slipped 9.5%. South Korea’s Kospi plunged over 8.5%, triggering a circuit‑breaker, with SK Hynix down 11.5% and Samsung nearly 10%. The moves reflect concerns that reduced U.S. data‑centre builds will lower demand for the semiconductors these firms produce.
Official data sources
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This article is compiled from international market news for information only. It is not investment advice.