S&P 500 Plunges 4.3% in Worst Day Since April 2025 as Nasdaq Enters Correction

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US stocks fell sharply on Thursday, November 5, 2026, wiping out the gains from the big post midterm rally a day earlier. The S&P 500 fell about 4.3 percent, its worst single day since April 2025. The Nasdaq Composite dropped 5.5 percent and closed in correction territory, more than 10 percent below its record close on October 6. The Dow Jones Industrial Average lost 1,833.06 points, or 3.4 percent, to 51,523.06.

Earlier in the day, our post on the Nasdaq sliding toward correction reported the morning figures and warned the correction was on course to be confirmed. By the close, it was confirmed.

What happened

Chip stocks led the fall. The Philadelphia Semiconductor Index plunged 12.25 percent to 9,011.14, a drop of 1,257.52 points. Micron fell about 17 percent, Nvidia about 9 percent and AMD roughly 15 percent, while Tesla slid more than 10 percent. Large cap technology shares had their worst session since the pandemic selloff of 2020, and the Nasdaq slipped below its 200 day moving average.

The trigger was a reassessment of the Democratic sweep of Congress in Tuesday’s midterm elections. Investors have been weighing whether a change of power in Washington brings tighter scrutiny of the data center buildout that has driven the year’s equity gains. Qualcomm’s weak earnings outlook added to the pressure on chipmakers, and Microsoft’s tougher stance on neocloud projects hit those shares hard earlier in the day.

Retail investors, who usually buy dips, did the opposite. They sold a net 358 million dollars of individual US stocks as of 2:58 p.m. in New York, on pace for the largest single day net selling since March 17, 2020, when the figure was 502 million dollars.

Oil moved the other way. Brent traded around 98 dollars a barrel and WTI around 90 dollars, up about 3 percent, after Vice President JD Vance said the party lost the midterms because of the war, prompting hopes of a push toward ending the Middle East conflict.

The damage in individual names predates Thursday. Lam Research shares are down 36 percent over the past month, Applied Materials 30 percent, AMD 22 percent and Nvidia 15 percent, which means the leaders of the 2026 rally were already in a deep drawdown before the S&P 500’s worst session in more than a year. The Dow and S&P 500 remain well short of correction territory measured from their records, while the Nasdaq, the Nasdaq 100 and the semiconductor index have each crossed the 10 percent threshold.

Why it matters for beginners

A correction is a fall of at least 10 percent from a recent peak. It is a normal part of markets, and it is not the same as a bear market, which is usually a fall of 20 percent or more. The Nasdaq 100 had already entered a correction earlier in the week, and Thursday’s close brought the broader Nasdaq Composite into one as well.

The reason for the fall matters as much as the size. Investors are worried about two things at once. First, they fear that the Democrats’ midterm win could slow the rapid buildout of data centers, because new rules and public opposition could delay projects. Second, they are questioning how much big technology companies are spending on artificial intelligence, and how quickly that spending turns into profit. When a few crowded trades unwind at the same time, the fall can be fast.

For beginners, the key lesson is to focus on your goal and your time horizon rather than reacting to one day of selling. A broad market fall pulls a whole basket of stocks down, while a broad rise lifts it, so a single sharp day does not tell you what will happen next week or next month.

The jobs market gave one calmer signal on the same day. A Challenger, Gray and Christmas report showed US employers announced the fewest layoff plans since 2023 in October, leaving the labor market data intact ahead of Friday’s payrolls report. See our post on US job cuts falling to a three year October low.

What to watch next

Watch Friday’s October US jobs report, which economists expect to show about 65,000 new jobs. Also watch what Democratic leaders in Congress say about data center rules and technology regulation, whether chip companies give any update on demand, and whether the selling continues into another session. Nvidia’s earnings are now the key signal for artificial intelligence spending momentum.

FAQ

What is a stock market correction?

A correction is a fall of at least 10 percent in an index from its recent peak. It is a normal part of investing and happens often, and it is not the same as a bear market, which is usually a fall of 20 percent or more.

Why did stocks fall so sharply on November 5, 2026?

Chip and data center stocks fell sharply as investors reassessed the Democrats’ midterm sweep and worried it could slow data center expansion. Qualcomm’s weak outlook and questions about heavy artificial intelligence spending added to the selling, one day after a big post election rally.

Why did chip stocks fall more than the rest of the market?

Chipmakers and data center companies had risen a lot on artificial intelligence hopes, so they had further to fall when sentiment turned. The semiconductor index fell 12.25 percent on the day, with Micron, Nvidia and AMD among the biggest losers.

Does a correction mean I should sell my investments?

No. A correction by itself is not a reason to sell. Beginners should focus on their goal, their time horizon, and whether they can leave money invested through falls as well as rises, rather than reacting to one day of selling.

Sources

The Private Banker, S&P 500 Plunges 4.3% in Worst Day Since April 2025 as Semiconductor Index Sinks 12%, Pushing Nasdaq Into Correction, November 5, 2026 (figures sourced from Yahoo Finance and Bloomberg): https://leprivatebanker.com/2026/11/05/sp-500-plunges-4-3-in-worst-day-since-april-2025-as-semiconductor-index-sinks-12-pushing-nasdaq-into-correction/

Reuters, Nasdaq set to confirm correction as AI stocks tumble, November 5, 2026, intraday figures cross-checked against the closing report.

This article is for general information and education only. It is not legal or financial advice.