The AI Stock Sell-Off: Why Trillions Were Wiped From Tech Stocks on 5 November 2026
· 4 min read · Lumivar Trading
Thursday 5 November 2026 was Wall Street's worst day since the April 2025 tariff shock. AI and chip stocks led the fall: the Nasdaq 100 dropped 6.4%, its worst session since March 2020, wiping out an estimated $2.3–2.5 trillion in market value from that index alone. Across US stocks, losses approached $3 trillion in a single day.
The sell-off came one day after one of the best rallies in months, and it pushed the Nasdaq into a correction, roughly 12% below its 6 October record. This recap covers what happened, why the AI trade unwound so fast, and what traders should watch next.
What happened on 5 November
The selling was broad, but it hit hardest where the AI trade was most crowded:
| Market | Move on 5 Nov | Context |
|---|---|---|
| Nasdaq 100 | −6.4% | Worst day since March 2020 |
| S&P 500 | −4.4% | Worst day since April 2025 |
| Dow Jones | −3.4% | All 30 stocks closed lower |
| Philadelphia Semiconductor Index (SOX) | −12% | Lowest level in more than six months |
| South Korea's Kospi | −5.3% | Chip-heavy index sold off with the US |
Wall Street's "fear gauge", the VIX, had its biggest one-day jump since December 2024.
The biggest losers
Chipmakers, AI cloud providers and data-centre power stocks took the heaviest damage:
- AMD and Micron: down around 17%
- Nebius: down about 15%
- Tesla: down about 11%
- Broadcom and CoreWeave: down about 10%
- Nvidia: down about 9%, the biggest single drag on the S&P 500
- GE Vernova: down about 7%
- Microsoft: down about 3.6%
Even the cloud giants that had held up the day before, Amazon and Alphabet, fell around 2%. Credit markets showed stress too: CoreWeave's credit default swap spreads hit a record, a sign that lenders are getting nervous about how AI infrastructure is being financed.
Why AI stocks crashed
No single headline caused the sell-off. Several worries hit at once.
1. The US midterm results
Democrats' sweep in the 3 November midterms raised the chance of tighter rules on AI and pauses on new data-centre construction. Voters in many states have pushed back on data centres over their strain on power grids, water supplies and electricity bills. Many planned facilities still need permits, and investors started pricing in delays.
2. A real threat to the data-centre build-out
UBS analysts estimated that around 30% of the US data-centre capacity expected to come online in 2028 could be at risk from construction pauses. Chipmakers, server makers and power companies have been priced for years of uninterrupted growth, so even a partial slowdown changes the maths.
3. Higher interest rates
Borrowing has become more expensive since US yields climbed in late summer, with the 10-year Treasury yield above 5.3% last month. That matters most for the newer "neocloud" companies that rely on debt to buy chips and build data centres.
4. Doubts about the return on AI spending
Big tech has committed enormous sums to AI. After a huge run in AI stocks, investors are asking harder questions about when that spending pays off. As one fund manager put it: "The market's moving from the promise of AI to the price of AI."
Where the money went
Money moved towards safety. The 10-year Treasury yield fell to about 4.83% from 4.90% as investors bought bonds, and defensive sectors like consumer staples and utilities fell far less than the market. Gold also gained during the week.
Outside the US, the Bank of England raised interest rates for the first time in three years on the same day, and Asian chip stocks sold off with Wall Street.
Is this the end of the AI trade?
Nobody knows yet, and one bad day doesn't decide a trend. Chip stocks bounced on Friday, but the Nasdaq still ended the week in correction territory. A few things will shape what happens next:
- Nvidia earnings (expected around 17 November). The biggest test yet of whether AI demand is holding up. Guidance on data-centre orders will matter more than the quarter itself.
- The Fed's 9 December decision. Strong October jobs data has traders pricing a possible rate hike. Higher rates are a headwind for richly valued tech stocks.
- Data-centre policy headlines. Any news on permits, construction pauses or energy rules can move chip and power stocks fast.
- Volatility. While the VIX stays high, daily swings in tech stocks will stay large.
You can follow upcoming releases and earnings dates on Lumivar's economic and earnings calendars.
How to trade a market like this
Sell-offs like this are where many traders make their biggest mistakes: buying every dip too early, holding losers out of hope, or trading too large because the moves look big.
- Size down when volatility rises. Bigger daily ranges mean wider stops, so the same risk needs a smaller position. Use the position size calculator before every trade.
- Check the reward before you enter. In choppy markets, make sure the trade is worth the risk with the risk/reward calculator.
- Know the event dates. Earnings and central bank decisions cause the biggest gaps. Don't hold a position into them by accident.
- Journal what you do. Write down how you traded the sell-off and how you felt. Your journal will show whether you follow your plan under pressure, which is worth more than any single trade. Our guide on how to keep a trading journal explains how.
Figures are from market reports on 5–6 November 2026 and may be revised. This is market information, not investment advice.