Wall Street bloodbath: $2.5 trillion wiped out as Nasdaq suffers worst crash in 18 months

Wall Street’s three major indexes all suffered steep losses during the selloff. The Nasdaq, which is heavily weighted toward technology companies, fell 5.5%. The S&P 500 declined 4.4%. The Dow Jones Industrial Average dropped 1,833 points, or 3.4%, closing at 51,868.

The Nasdaq’s fall was especially significant because it pushed the index 10% below its recently reached record high. That placed it in correction territory. The S&P 500 also recorded its worst single-day decline since April 2025, while the Nasdaq had its worst fall in 18 months.

The losses were broad, not limited to technology. All 11 S&P 500 sectors ended lower, and seven lost at least 2%. The VIX fear index rose 61%, showing that investors expected much greater market volatility after the sudden decline.

A market correction describes a substantial pullback from a recent market peak. A fall of 10% is the commonly used threshold. It is larger than an ordinary daily fluctuation but smaller than the much deeper decline generally associated with a bear market.

The Nasdaq had recently reached a record high before Thursday’s selloff. Its 5.5% one-day drop left it 10% below that peak. Because the decline reached the 10% threshold, the index entered correction territory. This description measures the distance from the high, not only the size of one day’s fall.

The label signals that investors have become more cautious, but it does not predict what happens next. In this case, concerns about heavy AI spending, possible regulation, and slower data-centre expansion helped drive the retreat. The Nasdaq’s correction occurred alongside broad losses across the S&P 500 and Dow.

Market value, or market capitalisation, is the total value investors assign to publicly traded companies through their share prices. When prices fall across many companies, that combined value can shrink dramatically. Thursday’s Wall Street selloff erased a reported $2.5 trillion in market value in one day.

Technology shares suffered some of the largest declines. Nvidia, previously the world’s largest company by market capitalisation, dropped 9.3%, leaving its shares down for the year. Memory maker SanDisk plunged 22%. Western Digital, a hard-drive manufacturer, lost 17%. These companies are closely connected to technology and infrastructure demand.

The losses showed that investors were reassessing popular AI-related trades. Concerns about heavy artificial-intelligence spending, tighter regulation, and slower data-centre growth reduced enthusiasm for companies supplying chips, memory, storage, equipment, and infrastructure. The pressure then spread into the wider market.

Technology companies had benefited from strong enthusiasm about artificial intelligence, but investors began questioning whether the spending pace could continue. Heavy AI investment requires large purchases of chips, memory, storage, equipment, and data-centre capacity. If growth slows, suppliers may receive fewer orders than investors expected.

The article points to two connected pressures. Investors were positioning for slower data-centre expansion, which put pressure on chipmakers and companies supplying equipment and infrastructure. They also worried that the AI industry could face tougher scrutiny after the US midterm election results. Both developments made future growth look less certain.

When expectations weaken, investors often reassess high-priced or popular shares quickly. Nvidia fell 9.3%, SanDisk dropped 22%, and Western Digital lost 17%. The selloff showed how dependent many technology valuations had become on continued AI spending and rapid industry expansion.

When share prices fall, investors holding those shares see the market value of their portfolios decline. The article specifically notes that 401(k) accounts had dropped during the selloff. A lower share price does not necessarily mean every investor sold, but it reduces the recorded value of investments tied to those stocks.

At the same time, investors sought safer assets. They increased demand for US government bonds, including the benchmark 10-year Treasury note. Bond prices and yields move in opposite directions. When stronger demand pushes bond prices higher, their yields generally fall. The article reports that the 10-year yield slipped to its lowest level since September 9.

This shift showed a change in investor priorities. Instead of pursuing technology shares and other riskier assets, investors were seeking protection from market uncertainty. The 61% rise in the VIX, Wall Street’s fear index, reinforced the picture of heightened volatility and caution.

A major market selloff can spread when investors reassess risk across many industries at once. Technology concerns were the initial focus, but uncertainty can affect companies that depend on economic growth, business investment, consumer activity, or stable financial conditions. Investors may sell broadly rather than isolate one sector.

The article gives several examples. Caterpillar fell 6.4%, JPMorgan Chase dropped 4.2%, and UnitedHealth and 3M each declined more than 3%. All 11 S&P 500 sectors ended lower, with seven losing at least 2%. This shows that pressure reached manufacturers, banks, healthcare, and other businesses.

The reaction also crossed national borders. Japan’s Nikkei fell 6%, while South Korea’s Kospi dropped more than 8% in early trading. Rising volatility, a 61% jump in the VIX, and movement into government bonds reflected a broad retreat from risk rather than a technology-only decline.

A stock price is the market’s current estimate of what one share of a company is worth. Investors consider expected future profits, growth, risks, and broader economic conditions. Market capitalisation is the share price multiplied by the number of shares outstanding. Therefore, a price change immediately changes the company’s market value.

For example, if investors expect an AI supplier’s profits to grow rapidly, they may buy its shares, lifting the price and market capitalisation. If they later expect slower data-centre growth, heavier regulation, or weaker spending, they may sell. The price can fall even before the company reports lower profits because expectations have changed.

That mechanism helps explain Thursday’s losses. Nvidia, SanDisk, and Western Digital all fell sharply as investors reassessed AI-related growth. The declines show that stock markets value expected future performance, not only profits already recorded. Markets can therefore move quickly when confidence changes.