U.S. Blue Wave Wipes $3.5 Trillion Off Global Stocks in a Day

The world's stock markets lost about $3.5 trillion in value on Nov. 5, 2026, as investors sold chipmakers on fears that Democrats' sweep of the U.S. midterm elections would slow the building of AI data centers. Global market capitalization fell to $154 trillion from the day before, Nikkei reported, citing data from QUICK and FactSet.

Korean newspapers carried the tally on Nov. 7 and converted the loss to about ₩4,773 trillion ($3.5 trillion). In Seoul, the KOSPI, Korea's benchmark index, fell 5.28% on Nov. 5 and another 6.02% on Nov. 6, when a circuit breaker halted trading.

Over those two sessions the KOSPI lost 11%, a steeper fall than in Tokyo or Taipei. The reason is concentration: Korea's market leans on two memory chipmakers, Samsung Electronics and SK hynix, and chip suppliers took the worst of the sell-off.

The $3.5 Trillion Tally

Nikkei's figure compares the value of all listed shares worldwide on Nov. 5 with their value on Nov. 4. The drop equals about 2.2% of world market value, and it leaves out the next day's losses in Asia, when the Tokyo Stock Exchange's Prime market alone lost another ¥77 trillion.

U.S. technology stocks made up most of the total. Companies in the Nasdaq index lost about $2.5 trillion in value, the largest one-day drop on record, the Asia Business Daily reported. That is roughly 70% of the global loss.

The Nasdaq Composite fell 5.52% to 24,315.00, the S&P 500 dropped 4.36% to 7,353.73 and the Dow Jones Industrial Average lost 3.44% to 51,523.06, CNBC reported. All three had their worst day since April 2025, and the Nasdaq closed more than 10% below the record it set in October 2026, which put it in a correction.

Chipmakers fell furthest. The Philadelphia Semiconductor Index dropped 12.25%, its steepest fall since March 2020, the Seoul Economic Daily reported. Micron Technology fell 17%, Broadcom 10% and Nvidia 9%, and Nvidia alone lost more than $440 billion in market value, according to CNBC.

The dollar amounts are large partly because the market is large. World market value has grown 1.6 times since ChatGPT's release in November 2022, the Seoul Economic Daily reported, citing Nikkei, so the same percentage drop now erases more money.

"Unlike yesterday, you're just seeing that the sell-off in tech, the size of it, is now feeding itself into the broader market," said Keith Lerner, chief investment officer at Truist Wealth, according to CNBC.

Data Center Fears

The trigger was the midterm vote held on Nov. 3, 2026. Democrats won control of both the House of Representatives and the Senate and flipped five governorships, CNBC reported, defeating Texas's three-term Republican governor, Greg Abbott, and winning in Georgia, Iowa, Ohio and Nevada. The sweep became known as the blue wave, after the party's color.

Investors read the result through one industry: data centers, the large server buildings that train and run artificial intelligence. Some Democrats at the national and state level have called for data center moratoriums, CNBC reported. Of the 36 governors who won or were leading their races, 34 supported data center regulation, according to tech news outlet The Information, as cited by the Korea JoongAng Daily.

Fears grew after Texas Governor-elect Gina Hinojosa, a Democrat, spoke about the industry on Nov. 5. Texas has become a major data center hub. "We need to stop what we are doing with data centers until we have measures to protect Texans," she said in a CNN interview, according to CNBC.

Brokerages have tried to size the risk. Goldman Sachs estimated that about 45% of planned new U.S. data center capacity could face temporary project suspensions, the Korea JoongAng Daily reported. Mirae Asset Securities estimated that up to 13 gigawatts of planned capacity could be affected, about 8% of the new capacity expected by 2035.

The losses were uneven. Hyperscalers, the cloud companies that pay for data centers, saw relatively modest losses, while the chipmakers that supply them fell steeply on concerns that slower spending could dampen chip demand, the Korea JoongAng Daily reported. On Nov. 4, the first session after the vote, the Dow rose 3.03% and the Nasdaq 1.44%, even as the chip index fell 3.13%.

"It's about tone and tenor from the party that did really well, incredibly well, at the federal level and at the state level," said Tim Holland, chief investment officer at Orion, according to CNBC. No rule has changed yet: Hinojosa and other winners do not take office until January 2027, CNBC noted.

Seoul's Chip-Heavy Market

Asia absorbed the U.S. losses on Nov. 6, before Wall Street steadied later that day. Japan's Nikkei 225 fell 5.96% and Taiwan's Taiex 4.5%, after drops of 1.8% and 3.2% on Nov. 5, the Korea JoongAng Daily reported. In New York, the Nasdaq then rose 1.09% to 24,579.42, according to CNBC.

The Taiex fell as much as 8.99% after the open, its largest intraday drop on record. Taiwan Semiconductor Manufacturing Co. (TSMC), the world's largest contract chipmaker, fell as much as 9.82%, the Asia Business Daily reported.

Seoul had started falling a day earlier, after U.S. chip stocks slid in the first session after the vote. On Nov. 5, the KOSPI dropped 5.28% to 5,383.80, against 1.79% for the Nikkei and 3.20% for the Taiex, the Seoul Economic Daily reported. About 70% of that day's net selling by foreign investors was in Samsung Electronics and SK hynix, the newspaper said.

Foreign investors sold a net ₩3.43 trillion ($2.5 billion) of KOSPI shares on Nov. 5, according to the Korea JoongAng Daily.

Samsung Electronics fell 7.57% to ₩201,500 ($149) and SK hynix 9.46% to ₩1,264,000 ($932). The two companies lost a combined ₩192.9 trillion ($142 billion) in market value in a single session, according to the Seoul Economic Daily.

On Nov. 6, the KOSPI fell more than 8% after the opening bell and touched 4,911.28, its first trade below 5,000 since Feb. 6, 2026, the Korea Herald reported. A circuit breaker at 9:03 a.m. halted all trading on the main board for 20 minutes, the Seoul Economic Daily reported, citing the Korea Exchange.

The index closed down 6.02% at 5,059.69, according to the exchange. Samsung fell 6.35% to ₩188,700 ($139) and SK hynix 10.44% to ₩1.132 million ($834), for two-day losses of 13% and 19%. Foreign investors sold a net ₩2.8 trillion ($2.1 billion) of shares, Yonhap News Agency reported.

The won weakened by 14.5 won to 1,356.6 per dollar at the 3:30 p.m. close in Seoul on Nov. 6, its sharpest daily drop since May 12, 2026, the Korea Herald reported. This article converts won at that rate.

The two-day fall extends a long decline. The KOSPI peaked at 9,114.55 on June 22, 2026, and now stands at about 55% of that level, according to the Korea Herald. The combined value of KOSPI-listed companies has fallen by more than ₩3,000 trillion ($2.2 trillion) from its peak, the Seoul Economic Daily reported.

Korea context: The KOSPI's circuit breaker stops trading in all stocks on the main board for 20 minutes once the index has stayed 8% or more below the previous close for one minute, the Seoul Economic Daily explained. The Nov. 6 halt was the first since Oct. 15, 2026. A milder tool, the sidecar, suspends program trading orders for five minutes when KOSPI futures move at least 5% for one minute, according to the Korea JoongAng Daily. Trading hours for foreign investors are covered in our guide to buying Korean stocks from abroad.

"Korea's market has suffered steeper losses given its heavy exposure to chipmakers, with semiconductor stocks emerging as among the biggest casualties of the midterm election fallout," said Hwang San-hae, a market strategy analyst at LS Securities, according to the Korea JoongAng Daily.

Others called the reaction too large. "The likelihood of AI data center construction coming to a complete halt is limited, and we believe market concerns are overblown," said Lee Kyung-min, an analyst at Daishin Securities, according to the Korea Herald. He put the chance of new project suspensions in Texas, Georgia and Ohio at 15% to 30%, with rising costs and construction delays the more likely risks.

What to Watch

U.S. inflation data come first. October consumer prices are due on Nov. 10 and producer prices on Nov. 13, ahead of the Federal Reserve's two-day policy meeting starting Dec. 8, the Korea JoongAng Daily reported.

The bigger test for chip stocks is Nvidia, which is scheduled to report third-quarter earnings on Nov. 17, 2026, CNBC reported. Its results will give the first company-level read on data center orders since the election.

Policy will move more slowly. The winners take office in January 2027, and investors will watch whether Texas and other states turn campaign positions into rules on new data centers.

Taken together, the rout priced in slower AI data center building before any rule has changed, and Seoul's chip-heavy market took a bigger hit than Tokyo or Taipei. The next test is Nvidia's earnings on Nov. 17, 2026.