AI stock sell-off explained: how $2.5 trillion left the Nasdaq

What happened. On Thursday, November 5, the Nasdaq lost about $2.5 trillion in market value, CNN reports. According to elEconomista, the index fell 6.36%, its worst day since 2020. On Friday AI shares bounced and won back part of the losses. The S&P 500 rose 0.3% but ended the week down 2.7%. That is its worst week since April 2025, when Donald Trump shook markets with his Liberation Day tariffs.

Cause one: politics. US midterm results came in late on Tuesday night. Futures fell at first, then the market rose on Wednesday morning as investors cheered Democratic gains. By Thursday the mood had flipped. The market feared that winning Democrats would tighten rules for AI and slow data center building. One example is Texas, where Governor-elect Gina Hinojosa promised to pause new construction for a while and roll back some tax breaks. AP adds that voters across parties are wary of AI and dislike higher power bills caused by data centers.

The backdrop. Even before the vote the industry worried that costly borrowing would slow construction. Critics had long said AI shares had risen too far and formed a bubble.

What made the fall worse. According to CNN, funds that borrow to make bigger bets get calls from lenders to add cash when prices drop. If they cannot, they sell stocks, prices fall further, and the loop repeats. elEconomista cites analyst estimates. Retail investors sold first: Jefferies calls it the biggest wave of retail selling since March 2020. Then automatic mechanisms kicked in. Nomura puts the pressure from option hedging at $7 billion for every 1% drop. Volatility control funds sold almost $61 billion, leveraged ETFs added about $47 billion, and commodity trading advisors (CTAs) sold almost $13 billion of futures. The same source says the US stock market fell back by $3.7 trillion. That is a different measure from CNN's, so the totals do not match.

How the week ended. On Friday Tokyo and Seoul fell about 6%, and Germany's DAX lost 1.9%. In the US, Nvidia rose 2.8% after drops of 9.3% and 3.2%. Lam Research gained 8.2% after announcing a buyback of up to $25 billion. The Nasdaq rose 1.1% and the Dow Jones lost 0.5%. The S&P 500 is still 5.7% below last month's record.

What is still unclear. Power in Washington is split: Democrats hold Congress, Republican Trump holds the White House and the veto. AP says this may limit federal moves against AI. A strong jobs report helps the economy but could lift inflation: according to CME, the odds of a Fed rate hike in December rose. The 10-year US Treasury yield was 4.86% on Friday.

已确认的事实

• On Thursday about $2.5 trillion of market value left the Nasdaq.^[2]
• According to elEconomista, the Nasdaq fell 6.36%, its worst day since 2020.^[3]
• The market rose on Wednesday after the election results, then on Thursday feared Democrats would tighten rules for AI and slow data center building.^[2][1]
• Texas Governor-elect Gina Hinojosa promised to temporarily halt new data center construction and roll back some tax incentives for their owners.^[2]
• Funds that borrow to make bets can get calls to add cash when prices fall and are forced to sell stocks, which deepens the sell-off.^[2]
• Jefferies estimates that retail investors staged the biggest wave of selling since March 2020.^[3]
• Nomura estimates the pressure from option hedging at about $7 billion for every 1% drop, and says volatility control funds sold almost $61 billion.^[3]
• Rebalancing by leveraged ETFs added about $47 billion of selling, and commodity trading advisors (CTAs) sold almost $13 billion of S&P 500 and Nasdaq futures.^[3]
• According to elEconomista, the US stock market fell back by $3.7 trillion.^[3]
• On Friday the S&P 500 rose 0.3% and ended the week down 2.7%, its worst since April 2025. The Nasdaq rose 1.1% and the Dow Jones fell 0.5%.^[1]
• On Friday indexes in Tokyo and Seoul fell about 6% and Germany's DAX lost 1.9%.^[1]
• Nvidia shares rose 2.8% after drops of 9.3% and 3.2%.^[1]
• Lam Research rose 8.2% after announcing a buyback of up to $25 billion.^[1]
• The S&P 500 is still 5.7% below its record set last month.^[1]
• The 10-year US Treasury yield was 4.86%, after topping 5.30% last month.^[1]
• After a strong jobs report, traders see a bigger chance of a Fed rate hike at its December meeting, according to CME Group data.^[1]

影响

• 已确认The fall was deepened by borrowed money and automatic selling, not only by political news.
• 已确认A strong job market both helps the economy absorb slower data center building and raises the odds of a Fed rate hike.
• 我们的解读The main political risk for data centers now sits at state level, not in federal rules. This is our view.

仍未知

• Whether forced selling by funds is over: the expert quoted by CNN says it could last a few more days
• Which data center rules state governments, for example in Texas, will bring in, if any
• Whether the Fed will raise rates at its December meeting
• Why loss estimates differ: CNN cites $2.5 trillion for the Nasdaq, elEconomista $3.7 trillion for the US stock market

影响到谁

United States, Global. Anyone following AI stocks and world markets

来源

1. AP News: AI stocks halt their brutal, worldwide sell-off as Wall Street trims its loss for the week 2026年11月6日 · 媒体
2. CNN: What sparked the stock market's $2.5 trillion sell-off? 2026年11月6日 · 媒体
3. elEconomista: Anatomía de un jueves negro en las tecnológicas: así fue la reacción en cadena que sacudió a Wall Street 2026年11月6日 · 媒体